Blob Blame Raw
From e89d20d3574d83dec8642079f92dac3059f24c7d Mon Sep 17 00:00:00 2001
From: Laurentiu Tudor <laurentiu.tudor@nxp.com>
Date: Thu, 5 Nov 2020 17:30:50 +0200
Subject: [PATCH 01/44] bus: fsl-mc: make sure MC firmware is up and running

Some bootloaders might pause the MC firmware before starting the
kernel to ensure that MC will not cause faults as soon as SMMU
probes due to no configuration being in place for the firmware.
Make sure that MC is resumed at probe time as its SMMU setup should
be done by now.
Also included, a comment fix on how PL and BMT bits are packed in
the StreamID.

Signed-off-by: Laurentiu Tudor <laurentiu.tudor@nxp.com>
Link: https://lore.kernel.org/r/20201105153050.19662-2-laurentiu.tudor@nxp.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/bus/fsl-mc/fsl-mc-bus.c | 42 +++++++++++++++++++++++----------
 1 file changed, 30 insertions(+), 12 deletions(-)

diff --git a/drivers/bus/fsl-mc/fsl-mc-bus.c b/drivers/bus/fsl-mc/fsl-mc-bus.c
index 806766b1b45f..b8e6acdf932e 100644
--- a/drivers/bus/fsl-mc/fsl-mc-bus.c
+++ b/drivers/bus/fsl-mc/fsl-mc-bus.c
@@ -60,6 +60,9 @@ struct fsl_mc_addr_translation_range {
 	phys_addr_t start_phys_addr;
 };
 
+#define FSL_MC_GCR1	0x0
+#define GCR1_P1_STOP	BIT(31)
+
 #define FSL_MC_FAPR	0x28
 #define MC_FAPR_PL	BIT(18)
 #define MC_FAPR_BMT	BIT(17)
@@ -973,21 +976,36 @@ static int fsl_mc_bus_probe(struct platform_device *pdev)
 			return PTR_ERR(mc->fsl_mc_regs);
 	}
 
-	if (mc->fsl_mc_regs && IS_ENABLED(CONFIG_ACPI) &&
-	    !dev_of_node(&pdev->dev)) {
-		mc_stream_id = readl(mc->fsl_mc_regs + FSL_MC_FAPR);
+	if (mc->fsl_mc_regs) {
 		/*
-		 * HW ORs the PL and BMT bit, places the result in bit 15 of
-		 * the StreamID and ORs in the ICID. Calculate it accordingly.
+		 * Some bootloaders pause the MC firmware before booting the
+		 * kernel so that MC will not cause faults as soon as the
+		 * SMMU probes due to the fact that there's no configuration
+		 * in place for MC.
+		 * At this point MC should have all its SMMU setup done so make
+		 * sure it is resumed.
 		 */
-		mc_stream_id = (mc_stream_id & 0xffff) |
+		writel(readl(mc->fsl_mc_regs + FSL_MC_GCR1) & (~GCR1_P1_STOP),
+		       mc->fsl_mc_regs + FSL_MC_GCR1);
+
+		if (IS_ENABLED(CONFIG_ACPI) && !dev_of_node(&pdev->dev)) {
+			mc_stream_id = readl(mc->fsl_mc_regs + FSL_MC_FAPR);
+			/*
+			 * HW ORs the PL and BMT bit, places the result in bit
+			 * 14 of the StreamID and ORs in the ICID. Calculate it
+			 * accordingly.
+			 */
+			mc_stream_id = (mc_stream_id & 0xffff) |
 				((mc_stream_id & (MC_FAPR_PL | MC_FAPR_BMT)) ?
-					0x4000 : 0);
-		error = acpi_dma_configure_id(&pdev->dev, DEV_DMA_COHERENT,
-					      &mc_stream_id);
-		if (error)
-			dev_warn(&pdev->dev, "failed to configure dma: %d.\n",
-				 error);
+					BIT(14) : 0);
+			error = acpi_dma_configure_id(&pdev->dev,
+						      DEV_DMA_COHERENT,
+						      &mc_stream_id);
+			if (error)
+				dev_warn(&pdev->dev,
+					 "failed to configure dma: %d.\n",
+					 error);
+		}
 	}
 
 	/*
-- 
2.27.0


From f62794c7538c03c7ba8f3e744ff1d562207c2285 Mon Sep 17 00:00:00 2001
From: Laurentiu Tudor <laurentiu.tudor@nxp.com>
Date: Tue, 24 Nov 2020 13:12:00 +0200
Subject: [PATCH 02/44] bus: fsl-mc: added missing fields to
 dprc_rsp_get_obj_region structure

'type' and 'flags' fields were missing from dprc_rsp_get_obj_region
structure therefore the MC Bus driver was not receiving proper flags
from MC like DPRC_REGION_CACHEABLE.

Reviewed-by: Ioana Ciornei <ioana.ciornei@nxp.com>
Signed-off-by: Cristian Sovaiala <cristian.sovaiala@freescale.com>
Signed-off-by: Laurentiu Tudor <laurentiu.tudor@nxp.com>
Link: https://lore.kernel.org/r/20201124111200.1391-1-laurentiu.tudor@nxp.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/bus/fsl-mc/dprc.c           | 2 ++
 drivers/bus/fsl-mc/fsl-mc-private.h | 5 +++--
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/bus/fsl-mc/dprc.c b/drivers/bus/fsl-mc/dprc.c
index 57b097caf255..27b0a01bad9b 100644
--- a/drivers/bus/fsl-mc/dprc.c
+++ b/drivers/bus/fsl-mc/dprc.c
@@ -576,6 +576,8 @@ int dprc_get_obj_region(struct fsl_mc_io *mc_io,
 	rsp_params = (struct dprc_rsp_get_obj_region *)cmd.params;
 	region_desc->base_offset = le64_to_cpu(rsp_params->base_offset);
 	region_desc->size = le32_to_cpu(rsp_params->size);
+	region_desc->type = rsp_params->type;
+	region_desc->flags = le32_to_cpu(rsp_params->flags);
 	if (dprc_major_ver > 6 || (dprc_major_ver == 6 && dprc_minor_ver >= 3))
 		region_desc->base_address = le64_to_cpu(rsp_params->base_addr);
 	else
diff --git a/drivers/bus/fsl-mc/fsl-mc-private.h b/drivers/bus/fsl-mc/fsl-mc-private.h
index 85ca5fdee581..c932387641fa 100644
--- a/drivers/bus/fsl-mc/fsl-mc-private.h
+++ b/drivers/bus/fsl-mc/fsl-mc-private.h
@@ -211,12 +211,13 @@ struct dprc_cmd_get_obj_region {
 
 struct dprc_rsp_get_obj_region {
 	/* response word 0 */
-	__le64 pad;
+	__le64 pad0;
 	/* response word 1 */
 	__le64 base_offset;
 	/* response word 2 */
 	__le32 size;
-	__le32 pad2;
+	u8 type;
+	u8 pad2[3];
 	/* response word 3 */
 	__le32 flags;
 	__le32 pad3;
-- 
2.27.0


From 0f49df78f3c29e954e7ecb1b9428075144b103f3 Mon Sep 17 00:00:00 2001
From: Makarand Pawagi <makarand.pawagi@nxp.com>
Date: Tue, 21 Apr 2020 11:25:53 +0530
Subject: [PATCH 03/44] soc: fsl: enable acpi support for Guts driver

ACPI support is added in the Guts driver
This is in accordance with the DSDT table added for Guts

Signed-off-by: Makarand Pawagi <makarand.pawagi@nxp.com>
---
 drivers/soc/fsl/guts.c | 27 ++++++++++++++++++++++-----
 1 file changed, 22 insertions(+), 5 deletions(-)

diff --git a/drivers/soc/fsl/guts.c b/drivers/soc/fsl/guts.c
index 34810f9bb2ee..56b6797c265e 100644
--- a/drivers/soc/fsl/guts.c
+++ b/drivers/soc/fsl/guts.c
@@ -3,6 +3,7 @@
  * Freescale QorIQ Platforms GUTS Driver
  *
  * Copyright (C) 2016 Freescale Semiconductor, Inc.
+ * Copyright 2020 NXP
  */
 
 #include <linux/io.h>
@@ -138,7 +139,7 @@ static u32 fsl_guts_get_svr(void)
 
 static int fsl_guts_probe(struct platform_device *pdev)
 {
-	struct device_node *np = pdev->dev.of_node;
+	struct device_node *root;
 	struct device *dev = &pdev->dev;
 	struct resource *res;
 	const struct fsl_soc_die_attr *soc_die;
@@ -150,7 +151,8 @@ static int fsl_guts_probe(struct platform_device *pdev)
 	if (!guts)
 		return -ENOMEM;
 
-	guts->little_endian = of_property_read_bool(np, "little-endian");
+	guts->little_endian = fwnode_property_read_bool(pdev->dev.fwnode,
+							"little-endian");
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	guts->regs = devm_ioremap_resource(dev, res);
@@ -158,9 +160,17 @@ static int fsl_guts_probe(struct platform_device *pdev)
 		return PTR_ERR(guts->regs);
 
 	/* Register soc device */
-	root = of_find_node_by_path("/");
-	if (of_property_read_string(root, "model", &machine))
-		of_property_read_string_index(root, "compatible", 0, &machine);
+	if (dev_of_node(&pdev->dev)) {
+		root = of_find_node_by_path("/");
+		if (of_property_read_string(root, "model", &machine))
+			of_property_read_string_index(root,
+					"compatible", 0, &machine);
+		of_node_put(root);
+	} else {
+		fwnode_property_read_string(pdev->dev.fwnode,
+				"model", &machine);
+	}
+
 	if (machine)
 		soc_dev_attr.machine = machine;
 
@@ -234,10 +244,17 @@ static const struct of_device_id fsl_guts_of_match[] = {
 };
 MODULE_DEVICE_TABLE(of, fsl_guts_of_match);
 
+static const struct acpi_device_id fsl_guts_acpi_match[] = {
+	{"NXP0030", 0 },
+	{ }
+};
+MODULE_DEVICE_TABLE(acpi, fsl_guts_acpi_match);
+
 static struct platform_driver fsl_guts_driver = {
 	.driver = {
 		.name = "fsl-guts",
 		.of_match_table = fsl_guts_of_match,
+		.acpi_match_table = fsl_guts_acpi_match,
 	},
 	.probe = fsl_guts_probe,
 	.remove = fsl_guts_remove,
-- 
2.27.0


From 243f3dcb60a1ea9bd7e4fa979c2187a169fb069f Mon Sep 17 00:00:00 2001
From: Meenakshi Aggarwal <meenakshi.aggarwal@nxp.com>
Date: Wed, 27 May 2020 21:35:11 +0530
Subject: [PATCH 04/44] mmc: sdhci-of-esdhc: Add ACPI support

This patch is to add acpi support in esdhc controller driver

Signed-off-by: Meenakshi Aggarwal <meenakshi.aggarwal@nxp.com>
---
 drivers/mmc/core/core.c            |  2 +
 drivers/mmc/core/host.c            | 30 +++++++++-----
 drivers/mmc/host/of_mmc_spi.c      |  2 +-
 drivers/mmc/host/sdhci-esdhc-imx.c |  2 +-
 drivers/mmc/host/sdhci-of-esdhc.c  | 66 +++++++++++++++++++-----------
 drivers/mmc/host/sdhci-pltfm.c     |  1 +
 include/linux/mmc/host.h           |  2 +-
 7 files changed, 67 insertions(+), 38 deletions(-)

diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
index d42037f0f10d..35649b95a860 100644
--- a/drivers/mmc/core/core.c
+++ b/drivers/mmc/core/core.c
@@ -6,6 +6,8 @@
  *  SD support Copyright (C) 2004 Ian Molton, All Rights Reserved.
  *  Copyright (C) 2005-2008 Pierre Ossman, All Rights Reserved.
  *  MMCv4 support Copyright (C) 2006 Philip Langdale, All Rights Reserved.
+ *  Copyright 2020 NXP
+ *
  */
 #include <linux/module.h>
 #include <linux/init.h>
diff --git a/drivers/mmc/core/host.c b/drivers/mmc/core/host.c
index 96b2ca1f1b06..7cea676d9c48 100644
--- a/drivers/mmc/core/host.c
+++ b/drivers/mmc/core/host.c
@@ -378,22 +378,31 @@ EXPORT_SYMBOL(mmc_of_parse);
  * found, negative errno if the voltage-range specification is invalid,
  * or one if the voltage-range is specified and successfully parsed.
  */
-int mmc_of_parse_voltage(struct device_node *np, u32 *mask)
+int mmc_of_parse_voltage(struct device *dev, u32 *mask)
 {
-	const u32 *voltage_ranges;
+	u32 *voltage_ranges;
 	int num_ranges, i;
 
-	voltage_ranges = of_get_property(np, "voltage-ranges", &num_ranges);
-	if (!voltage_ranges) {
-		pr_debug("%pOF: voltage-ranges unspecified\n", np);
-		return 0;
-	}
-	num_ranges = num_ranges / sizeof(*voltage_ranges) / 2;
+	num_ranges = device_property_read_u32_array(dev,
+						    "voltage-ranges", NULL, 0);
+
 	if (!num_ranges) {
-		pr_err("%pOF: voltage-ranges empty\n", np);
+		pr_err("voltage-ranges empty\n");
 		return -EINVAL;
 	}
 
+	voltage_ranges = kcalloc(num_ranges, sizeof(u32), GFP_KERNEL);
+	if (!voltage_ranges)
+		return -ENOMEM;
+
+	device_property_read_u32_array(dev, "voltage-ranges",
+				       voltage_ranges, num_ranges);
+
+	if (!voltage_ranges) {
+		pr_debug("voltage-ranges unspecified\n");
+		return 0;
+	}
+
 	for (i = 0; i < num_ranges; i++) {
 		const int j = i * 2;
 		u32 ocr_mask;
@@ -402,8 +411,7 @@ int mmc_of_parse_voltage(struct device_node *np, u32 *mask)
 				be32_to_cpu(voltage_ranges[j]),
 				be32_to_cpu(voltage_ranges[j + 1]));
 		if (!ocr_mask) {
-			pr_err("%pOF: voltage-range #%d is invalid\n",
-				np, i);
+			pr_err("voltage-range #%d is invalid\n", i);
 			return -EINVAL;
 		}
 		*mask |= ocr_mask;
diff --git a/drivers/mmc/host/of_mmc_spi.c b/drivers/mmc/host/of_mmc_spi.c
index 3c4d950a4755..3178554a9efc 100644
--- a/drivers/mmc/host/of_mmc_spi.c
+++ b/drivers/mmc/host/of_mmc_spi.c
@@ -65,7 +65,7 @@ struct mmc_spi_platform_data *mmc_spi_get_pdata(struct spi_device *spi)
 	if (!oms)
 		return NULL;
 
-	if (mmc_of_parse_voltage(np, &oms->pdata.ocr_mask) <= 0)
+	if (mmc_of_parse_voltage(dev, &oms->pdata.ocr_mask) <= 0)
 		goto err_ocr;
 
 	oms->detect_irq = irq_of_parse_and_map(np, 0);
diff --git a/drivers/mmc/host/sdhci-esdhc-imx.c b/drivers/mmc/host/sdhci-esdhc-imx.c
index 5d9b3106d2f7..4b846f5741ad 100644
--- a/drivers/mmc/host/sdhci-esdhc-imx.c
+++ b/drivers/mmc/host/sdhci-esdhc-imx.c
@@ -1502,7 +1502,7 @@ sdhci_esdhc_imx_probe_dt(struct platform_device *pdev,
 	if (of_property_read_u32(np, "fsl,delay-line", &boarddata->delay_line))
 		boarddata->delay_line = 0;
 
-	mmc_of_parse_voltage(np, &host->ocr_mask);
+	mmc_of_parse_voltage(&pdev->dev, &host->ocr_mask);
 
 	if (esdhc_is_usdhc(imx_data) && !IS_ERR(imx_data->pinctrl)) {
 		imx_data->pins_100mhz = pinctrl_lookup_state(imx_data->pinctrl,
diff --git a/drivers/mmc/host/sdhci-of-esdhc.c b/drivers/mmc/host/sdhci-of-esdhc.c
index ab5ab969f711..62a70b39497d 100644
--- a/drivers/mmc/host/sdhci-of-esdhc.c
+++ b/drivers/mmc/host/sdhci-of-esdhc.c
@@ -10,6 +10,7 @@
  *	    Anton Vorontsov <avorontsov@ru.mvista.com>
  */
 
+#include <linux/acpi.h>
 #include <linux/err.h>
 #include <linux/io.h>
 #include <linux/of.h>
@@ -73,6 +74,14 @@ static const struct of_device_id sdhci_esdhc_of_match[] = {
 };
 MODULE_DEVICE_TABLE(of, sdhci_esdhc_of_match);
 
+#ifdef CONFIG_ACPI
+static const struct acpi_device_id sdhci_esdhc_ids[] = {
+	{"NXP0003" },
+	{ }
+};
+MODULE_DEVICE_TABLE(acpi, sdhci_esdhc_ids);
+#endif
+
 struct sdhci_esdhc {
 	u8 vendor_ver;
 	u8 spec_ver;
@@ -1366,29 +1375,35 @@ static void esdhc_init(struct platform_device *pdev, struct sdhci_host *host)
 		esdhc->clk_fixup = match->data;
 	np = pdev->dev.of_node;
 
-	if (of_device_is_compatible(np, "fsl,p2020-esdhc")) {
-		esdhc->quirk_delay_before_data_reset = true;
-		esdhc->quirk_trans_complete_erratum = true;
-	}
+	/* in case of device tree, get clock from framework */
+	if (np) {
+		if (of_device_is_compatible(np, "fsl,p2020-esdhc")) {
+			esdhc->quirk_delay_before_data_reset = true;
+			esdhc->quirk_trans_complete_erratum = true;
+		}
 
-	clk = of_clk_get(np, 0);
-	if (!IS_ERR(clk)) {
-		/*
-		 * esdhc->peripheral_clock would be assigned with a value
-		 * which is eSDHC base clock when use periperal clock.
-		 * For some platforms, the clock value got by common clk
-		 * API is peripheral clock while the eSDHC base clock is
-		 * 1/2 peripheral clock.
-		 */
-		if (of_device_is_compatible(np, "fsl,ls1046a-esdhc") ||
-		    of_device_is_compatible(np, "fsl,ls1028a-esdhc") ||
-		    of_device_is_compatible(np, "fsl,ls1088a-esdhc"))
-			esdhc->peripheral_clock = clk_get_rate(clk) / 2;
-		else
-			esdhc->peripheral_clock = clk_get_rate(clk);
-
-		clk_put(clk);
-	}
+		clk = of_clk_get(np, 0);
+		if (!IS_ERR(clk)) {
+			/*
+			 * esdhc->peripheral_clock would be assigned with a value
+			 * which is eSDHC base clock when use periperal clock.
+			 * For some platforms, the clock value got by common clk
+			 * API is peripheral clock while the eSDHC base clock is
+			 * 1/2 peripheral clock.
+			 */
+			if (of_device_is_compatible(np, "fsl,ls1046a-esdhc") ||
+			    of_device_is_compatible(np, "fsl,ls1028a-esdhc") ||
+			    of_device_is_compatible(np, "fsl,ls1088a-esdhc"))
+				esdhc->peripheral_clock = clk_get_rate(clk) / 2;
+			else
+				esdhc->peripheral_clock = clk_get_rate(clk);
+
+			clk_put(clk);
+		}
+	} else {
+		device_property_read_u32(&pdev->dev, "clock-frequency",
+					 &esdhc->peripheral_clock);
+        }
 
 	esdhc_clock_enable(host, false);
 	val = sdhci_readl(host, ESDHC_DMA_SYSCTL);
@@ -1421,7 +1436,7 @@ static int sdhci_esdhc_probe(struct platform_device *pdev)
 
 	np = pdev->dev.of_node;
 
-	if (of_property_read_bool(np, "little-endian"))
+	if (device_property_read_bool(&pdev->dev, "little-endian"))
 		host = sdhci_pltfm_init(pdev, &sdhci_esdhc_le_pdata,
 					sizeof(struct sdhci_esdhc));
 	else
@@ -1489,7 +1504,7 @@ static int sdhci_esdhc_probe(struct platform_device *pdev)
 	if (ret)
 		goto err;
 
-	mmc_of_parse_voltage(np, &host->ocr_mask);
+	mmc_of_parse_voltage(&pdev->dev, &host->ocr_mask);
 
 	ret = sdhci_add_host(host);
 	if (ret)
@@ -1506,6 +1521,9 @@ static struct platform_driver sdhci_esdhc_driver = {
 		.name = "sdhci-esdhc",
 		.probe_type = PROBE_PREFER_ASYNCHRONOUS,
 		.of_match_table = sdhci_esdhc_of_match,
+#ifdef CONFIG_ACPI
+		.acpi_match_table = sdhci_esdhc_ids,
+#endif
 		.pm = &esdhc_of_dev_pm_ops,
 	},
 	.probe = sdhci_esdhc_probe,
diff --git a/drivers/mmc/host/sdhci-pltfm.c b/drivers/mmc/host/sdhci-pltfm.c
index 328b132bbe57..5053544edf48 100644
--- a/drivers/mmc/host/sdhci-pltfm.c
+++ b/drivers/mmc/host/sdhci-pltfm.c
@@ -5,6 +5,7 @@
  *
  * Copyright (c) 2007, 2011 Freescale Semiconductor, Inc.
  * Copyright (c) 2009 MontaVista Software, Inc.
+ * Copyright 2020 NXP
  *
  * Authors: Xiaobo Xie <X.Xie@freescale.com>
  *	    Anton Vorontsov <avorontsov@ru.mvista.com>
diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h
index c079b932330f..e26382febc0a 100644
--- a/include/linux/mmc/host.h
+++ b/include/linux/mmc/host.h
@@ -481,7 +481,7 @@ int mmc_add_host(struct mmc_host *);
 void mmc_remove_host(struct mmc_host *);
 void mmc_free_host(struct mmc_host *);
 int mmc_of_parse(struct mmc_host *host);
-int mmc_of_parse_voltage(struct device_node *np, u32 *mask);
+int mmc_of_parse_voltage(struct device *dev, u32 *mask);
 
 static inline void *mmc_priv(struct mmc_host *host)
 {
-- 
2.27.0


From 6e7e988629b1a305e6d5711085952622336e7afe Mon Sep 17 00:00:00 2001
From: Meharbaan <meharbaan.ali@puresoftware.com>
Date: Tue, 28 Jul 2020 17:41:31 +0530
Subject: [PATCH 05/44] drivers/mmc/host/sdhci-of-esdhc : Fix DMA coherent
 check in ACPI mode.

DMA-coherent check to set ESDHC_DMA_SNOOP mask was bypassed
when booted in ACPI mode. Now it also checks the acpi device and
its parents for _CCA property in the device, and sets the flag
accordingly.

Signed-off-by: Meharbaan <meharbaan.ali@puresoftware.com>
---
 drivers/base/property.c           | 38 +++++++++++++++++++++++++++++++
 drivers/mmc/host/sdhci-of-esdhc.c |  7 ++++--
 include/linux/property.h          |  2 ++
 3 files changed, 45 insertions(+), 2 deletions(-)

diff --git a/drivers/base/property.c b/drivers/base/property.c
index 4c43d30145c6..c9d76e55a226 100644
--- a/drivers/base/property.c
+++ b/drivers/base/property.c
@@ -17,6 +17,7 @@
 #include <linux/property.h>
 #include <linux/etherdevice.h>
 #include <linux/phy.h>
+#include <linux/platform_device.h>
 
 struct fwnode_handle *dev_fwnode(struct device *dev)
 {
@@ -837,6 +838,43 @@ enum dev_dma_attr device_get_dma_attr(struct device *dev)
 }
 EXPORT_SYMBOL_GPL(device_get_dma_attr);
 
+/**
+ * device_match_fw_node - Check if the device is the parent node.
+ * @dev:		Pointer to the device.
+ * @parent_fwnode	Pointer to the parent's firmware node.
+ *
+ * The function returns true if the device has no parent.
+ *
+ */
+static int device_match_fw_node(struct device *dev, const void *parent_fwnode)
+{
+	return dev->fwnode == parent_fwnode;
+}
+
+/**
+ * dev_dma_is_coherent - Check if the device or any of its parents has
+ * dma support enabled.
+ * @dev:     Pointer to the device.
+ *
+ * The function gets the device pointer and check for device_dma_supported()
+ * on the device pointer passed and then recursively on its parent nodes.
+ */
+
+bool dev_dma_is_coherent(struct device *dev)
+{
+	struct fwnode_handle *parent_fwnode;
+
+	while (dev) {
+		if (device_dma_supported(dev))
+			return true;
+		parent_fwnode = fwnode_get_next_parent(dev->fwnode);
+		dev = bus_find_device(&platform_bus_type, NULL,	parent_fwnode,
+				      device_match_fw_node);
+	}
+	return false;
+}
+EXPORT_SYMBOL_GPL(dev_dma_is_coherent);
+
 /**
  * fwnode_get_phy_mode - Get phy mode for given firmware node
  * @fwnode:	Pointer to the given node
diff --git a/drivers/mmc/host/sdhci-of-esdhc.c b/drivers/mmc/host/sdhci-of-esdhc.c
index 62a70b39497d..bb7e456ad17b 100644
--- a/drivers/mmc/host/sdhci-of-esdhc.c
+++ b/drivers/mmc/host/sdhci-of-esdhc.c
@@ -541,8 +541,11 @@ static int esdhc_of_enable_dma(struct sdhci_host *host)
 		dma_set_mask_and_coherent(dev, DMA_BIT_MASK(40));
 
 	value = sdhci_readl(host, ESDHC_DMA_SYSCTL);
-
-	if (of_dma_is_coherent(dev->of_node))
+	/*
+	 * of_dma_is_coherent() returns false in case of acpi hence
+	 * dev_dma_is_coherent() is used along with it.
+	 */
+	if (of_dma_is_coherent(dev->of_node) ||  dev_dma_is_coherent(dev))
 		value |= ESDHC_DMA_SNOOP;
 	else
 		value &= ~ESDHC_DMA_SNOOP;
diff --git a/include/linux/property.h b/include/linux/property.h
index 2d4542629d80..3e0a1a5655f0 100644
--- a/include/linux/property.h
+++ b/include/linux/property.h
@@ -379,6 +379,8 @@ bool device_dma_supported(struct device *dev);
 
 enum dev_dma_attr device_get_dma_attr(struct device *dev);
 
+bool dev_dma_is_coherent(struct device *dev);
+
 const void *device_get_match_data(struct device *dev);
 
 int device_get_phy_mode(struct device *dev);
-- 
2.27.0


From 287dea1fbd948fd84964d92ca7947245fe5473d8 Mon Sep 17 00:00:00 2001
From: Shameer Kolothum <shameerali.kolothum.thodi@huawei.com>
Date: Thu, 19 Nov 2020 12:11:43 +0000
Subject: [PATCH 06/44] ACPICA: IORT: Update for revision E
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

IORT revision E contains a few additions like,
    -Added an identifier field in the node descriptors to aid table
     cross-referencing.
    -Introduced the Reserved Memory Range(RMR) node. This is used
     to describe memory ranges that are used by endpoints and requires
     a unity mapping in SMMU.
    -Introduced a flag in the RC node to express support for PRI.

Signed-off-by: Shameer Kolothum <shameerali.kolothum.thodi@huawei.com>
---
 include/acpi/actbl2.h | 25 +++++++++++++++++++------
 1 file changed, 19 insertions(+), 6 deletions(-)

diff --git a/include/acpi/actbl2.h b/include/acpi/actbl2.h
index ec66779cb193..274fce7b5c01 100644
--- a/include/acpi/actbl2.h
+++ b/include/acpi/actbl2.h
@@ -68,7 +68,7 @@
  * IORT - IO Remapping Table
  *
  * Conforms to "IO Remapping Table System Software on ARM Platforms",
- * Document number: ARM DEN 0049D, March 2018
+ * Document number: ARM DEN 0049E, June 2020
  *
  ******************************************************************************/
 
@@ -86,7 +86,8 @@ struct acpi_iort_node {
 	u8 type;
 	u16 length;
 	u8 revision;
-	u32 reserved;
+	u16 reserved;
+	u16 identifier;
 	u32 mapping_count;
 	u32 mapping_offset;
 	char node_data[1];
@@ -100,7 +101,8 @@ enum acpi_iort_node_type {
 	ACPI_IORT_NODE_PCI_ROOT_COMPLEX = 0x02,
 	ACPI_IORT_NODE_SMMU = 0x03,
 	ACPI_IORT_NODE_SMMU_V3 = 0x04,
-	ACPI_IORT_NODE_PMCG = 0x05
+	ACPI_IORT_NODE_PMCG = 0x05,
+	ACPI_IORT_NODE_RMR = 0x06,
 };
 
 struct acpi_iort_id_mapping {
@@ -167,10 +169,10 @@ struct acpi_iort_root_complex {
 	u8 reserved[3];		/* Reserved, must be zero */
 };
 
-/* Values for ats_attribute field above */
+/* Masks for ats_attribute field above */
 
-#define ACPI_IORT_ATS_SUPPORTED         0x00000001	/* The root complex supports ATS */
-#define ACPI_IORT_ATS_UNSUPPORTED       0x00000000	/* The root complex doesn't support ATS */
+#define ACPI_IORT_ATS_SUPPORTED         (1)	/* The root complex supports ATS */
+#define ACPI_IORT_PRI_SUPPORTED         (1<<1)	/* The root complex supports PRI */
 
 struct acpi_iort_smmu {
 	u64 base_address;	/* SMMU base address */
@@ -241,6 +243,17 @@ struct acpi_iort_pmcg {
 	u64 page1_base_address;
 };
 
+struct acpi_iort_rmr {
+	u32 rmr_count;
+	u32 rmr_offset;
+};
+
+struct acpi_iort_rmr_desc {
+	u64 base_address;
+	u64 length;
+	u32 reserved;
+};
+
 /*******************************************************************************
  *
  * IVRS - I/O Virtualization Reporting Structure
-- 
2.27.0


From a4225192809e805517c41af17a5cc0073ce7c600 Mon Sep 17 00:00:00 2001
From: Shameer Kolothum <shameerali.kolothum.thodi@huawei.com>
Date: Thu, 19 Nov 2020 12:11:44 +0000
Subject: [PATCH 07/44] ACPI/IORT: Add support for RMR node parsing
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Add support for parsing RMR node information from ACPI.
Find associated stream ids and smmu node info from the
RMR node and populate a linked list with RMR memory
descriptors.

Signed-off-by: Shameer Kolothum <shameerali.kolothum.thodi@huawei.com>
---
 drivers/acpi/arm64/iort.c | 122 +++++++++++++++++++++++++++++++++++++-
 1 file changed, 121 insertions(+), 1 deletion(-)

diff --git a/drivers/acpi/arm64/iort.c b/drivers/acpi/arm64/iort.c
index 2494138a6905..69a20d7e0c84 100644
--- a/drivers/acpi/arm64/iort.c
+++ b/drivers/acpi/arm64/iort.c
@@ -40,6 +40,25 @@ struct iort_fwnode {
 static LIST_HEAD(iort_fwnode_list);
 static DEFINE_SPINLOCK(iort_fwnode_lock);
 
+struct iort_rmr_id {
+	u32  sid;
+	struct acpi_iort_node *smmu;
+};
+
+/*
+ * One entry for IORT RMR.
+ */
+struct iort_rmr_entry {
+	struct list_head list;
+
+	unsigned int rmr_ids_num;
+	struct iort_rmr_id *rmr_ids;
+
+	struct acpi_iort_rmr_desc *rmr_desc;
+};
+
+static LIST_HEAD(iort_rmr_list);         /* list of RMR regions from ACPI */
+
 /**
  * iort_set_fwnode() - Create iort_fwnode and use it to register
  *		       iommu data in the iort_fwnode_list
@@ -393,7 +412,8 @@ static struct acpi_iort_node *iort_node_get_id(struct acpi_iort_node *node,
 		if (node->type == ACPI_IORT_NODE_NAMED_COMPONENT ||
 		    node->type == ACPI_IORT_NODE_PCI_ROOT_COMPLEX ||
 		    node->type == ACPI_IORT_NODE_SMMU_V3 ||
-		    node->type == ACPI_IORT_NODE_PMCG) {
+		    node->type == ACPI_IORT_NODE_PMCG ||
+		    node->type == ACPI_IORT_NODE_RMR) {
 			*id_out = map->output_base;
 			return parent;
 		}
@@ -1659,6 +1679,103 @@ static void __init iort_enable_acs(struct acpi_iort_node *iort_node)
 #else
 static inline void iort_enable_acs(struct acpi_iort_node *iort_node) { }
 #endif
+static int iort_rmr_desc_valid(struct acpi_iort_rmr_desc *desc)
+{
+	struct iort_rmr_entry *e;
+	u64 end, start = desc->base_address, length = desc->length;
+
+	if (!IS_ALIGNED(start, SZ_64K) || !IS_ALIGNED(length, SZ_64K))
+		return -EINVAL;
+
+	end = start + length - 1;
+
+	/* Check for address overlap */
+	list_for_each_entry(e, &iort_rmr_list, list) {
+		u64 e_start = e->rmr_desc->base_address;
+		u64 e_end = e_start + e->rmr_desc->length - 1;
+
+		if (start <= e_end && end >= e_start)
+			return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int __init iort_parse_rmr(struct acpi_iort_node *iort_node)
+{
+	struct iort_rmr_id *rmr_ids, *ids;
+	struct iort_rmr_entry *e;
+	struct acpi_iort_rmr *rmr;
+	struct acpi_iort_rmr_desc *rmr_desc;
+	u32 map_count = iort_node->mapping_count;
+	int i, ret = 0, desc_count = 0;
+
+	if (iort_node->type != ACPI_IORT_NODE_RMR)
+		return 0;
+
+	if (!iort_node->mapping_offset || !map_count) {
+		pr_err(FW_BUG "Invalid ID mapping, skipping RMR node %p\n",
+		       iort_node);
+		return -EINVAL;
+	}
+
+	rmr_ids = kmalloc(sizeof(*rmr_ids) * map_count, GFP_KERNEL);
+	if (!rmr_ids)
+		return -ENOMEM;
+
+	/* Retrieve associated smmu and stream id */
+	ids = rmr_ids;
+	for (i = 0; i < map_count; i++, ids++) {
+		ids->smmu = iort_node_get_id(iort_node, &ids->sid, i);
+		if (!ids->smmu) {
+			pr_err(FW_BUG "Invalid SMMU reference, skipping RMR node %p\n",
+			       iort_node);
+			ret = -EINVAL;
+			goto out;
+		}
+	}
+
+	/* Retrieve RMR data */
+	rmr = (struct acpi_iort_rmr *)iort_node->node_data;
+	if (!rmr->rmr_offset || !rmr->rmr_count) {
+		pr_err(FW_BUG "Invalid RMR descriptor array, skipping RMR node %p\n",
+		       iort_node);
+		ret = -EINVAL;
+		goto out;
+	}
+
+	rmr_desc = ACPI_ADD_PTR(struct acpi_iort_rmr_desc, iort_node,
+				rmr->rmr_offset);
+
+	for (i = 0; i < rmr->rmr_count; i++, rmr_desc++) {
+		ret = iort_rmr_desc_valid(rmr_desc);
+		if (ret) {
+			pr_err(FW_BUG "Invalid RMR descriptor[%d] for node %p, skipping...\n",
+			       i, iort_node);
+			goto out;
+		}
+
+		e = kmalloc(sizeof(*e), GFP_KERNEL);
+		if (!e) {
+			ret = -ENOMEM;
+			goto out;
+		}
+
+		e->rmr_ids_num = map_count;
+		e->rmr_ids = rmr_ids;
+		e->rmr_desc = rmr_desc;
+
+		list_add_tail(&e->list, &iort_rmr_list);
+		desc_count++;
+	}
+
+	return 0;
+
+out:
+	if (!desc_count)
+		kfree(rmr_ids);
+	return ret;
+}
 
 static void __init iort_init_platform_devices(void)
 {
@@ -1688,6 +1805,9 @@ static void __init iort_init_platform_devices(void)
 
 		iort_enable_acs(iort_node);
 
+		if (iort_table->revision == 1)
+			iort_parse_rmr(iort_node);
+
 		ops = iort_get_dev_cfg(iort_node);
 		if (ops) {
 			fwnode = acpi_alloc_fwnode_static();
-- 
2.27.0


From dc79d5283e1e9fc0e2d002c06c898f98765d1c4d Mon Sep 17 00:00:00 2001
From: Shameer Kolothum <shameerali.kolothum.thodi@huawei.com>
Date: Thu, 19 Nov 2020 12:11:45 +0000
Subject: [PATCH 08/44] iommu/dma: Introduce generic helper to retrieve RMR
 info

Reserved Memory Regions(RMR) associated with an IOMMU may be
described either through ACPI tables or DT in systems with
devices that require a unity mapping or bypass for those
regions in IOMMU drivers.

Introduce a generic interface so that IOMMU drivers can retrieve
and set up necessary mappings.

Signed-off-by: Shameer Kolothum <shameerali.kolothum.thodi@huawei.com>
---
 drivers/iommu/dma-iommu.c | 36 ++++++++++++++++++++++++++++++++++++
 include/linux/dma-iommu.h |  8 ++++++++
 include/linux/iommu.h     | 16 ++++++++++++++++
 3 files changed, 60 insertions(+)

diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c
index 0cbcd3fc3e7e..d73768ecdd1a 100644
--- a/drivers/iommu/dma-iommu.c
+++ b/drivers/iommu/dma-iommu.c
@@ -166,6 +166,42 @@ void iommu_dma_get_resv_regions(struct device *dev, struct list_head *list)
 }
 EXPORT_SYMBOL(iommu_dma_get_resv_regions);
 
+/**
+ * iommu_dma_get_rmrs - Retrieve Reserved Memory Regions(RMRs) associated
+ *                      with a given IOMMU
+ * @iommu_fwnode: fwnode associated with IOMMU
+ * @list: RMR list to be populated
+ *
+ */
+int iommu_dma_get_rmrs(struct fwnode_handle *iommu_fwnode,
+		       struct list_head *list)
+{
+	return 0;
+}
+EXPORT_SYMBOL(iommu_dma_get_rmrs);
+
+struct iommu_rmr *iommu_dma_alloc_rmr(u64 base, u64 length,
+				      u32 *ids, int num_ids)
+{
+	struct iommu_rmr *rmr;
+	int i;
+
+	rmr = kzalloc(struct_size(rmr, ids, num_ids), GFP_KERNEL);
+	if (!rmr)
+		return NULL;
+
+	INIT_LIST_HEAD(&rmr->list);
+	rmr->base_address = base;
+	rmr->length = length;
+	rmr->num_ids = num_ids;
+
+	for (i = 0; i < num_ids; i++)
+		rmr->ids[i] = ids[i];
+
+	return rmr;
+}
+EXPORT_SYMBOL(iommu_dma_alloc_rmr);
+
 static int cookie_init_hw_msi_region(struct iommu_dma_cookie *cookie,
 		phys_addr_t start, phys_addr_t end)
 {
diff --git a/include/linux/dma-iommu.h b/include/linux/dma-iommu.h
index 2112f21f73d8..f502855e4da0 100644
--- a/include/linux/dma-iommu.h
+++ b/include/linux/dma-iommu.h
@@ -37,7 +37,11 @@ void iommu_dma_compose_msi_msg(struct msi_desc *desc,
 
 void iommu_dma_get_resv_regions(struct device *dev, struct list_head *list);
 
+int iommu_dma_get_rmrs(struct fwnode_handle *iommu, struct list_head *list);
+struct iommu_rmr *iommu_dma_alloc_rmr(u64 base, u64 length,
+				      u32 *ids, int num_ids);
 #else /* CONFIG_IOMMU_DMA */
+#include <linux/fwnode.h>
 
 struct iommu_domain;
 struct msi_desc;
@@ -78,5 +82,9 @@ static inline void iommu_dma_get_resv_regions(struct device *dev, struct list_he
 {
 }
 
+static inline int iommu_dma_get_rmrs(struct fwnode_handle *iommu, struct list_head *list)
+{
+	return 0;
+}
 #endif	/* CONFIG_IOMMU_DMA */
 #endif	/* __DMA_IOMMU_H */
diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index f11f5072af5d..d76a6da8df0b 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -592,6 +592,22 @@ struct iommu_sva {
 	struct device			*dev;
 };
 
+/**
+ * struct iommu_rmr - Reserved Memory Region details per IOMMU
+ * @list: Linked list pointers to hold RMR region info
+ * @base_address: base address of Reserved Memory Region
+ * @length: length of memory region
+ * @num_ids: number of associated device IDs
+ * @ids: associated device IDs
+ */
+struct iommu_rmr {
+	struct list_head	list;
+	phys_addr_t		base_address;
+	u64			length;
+	unsigned int		num_ids;
+	u32			ids[];
+};
+
 int iommu_fwspec_init(struct device *dev, struct fwnode_handle *iommu_fwnode,
 		      const struct iommu_ops *ops);
 void iommu_fwspec_free(struct device *dev);
-- 
2.27.0


From 67844f76ed8feae4d831f191efd3b7a3384b4f16 Mon Sep 17 00:00:00 2001
From: Shameer Kolothum <shameerali.kolothum.thodi@huawei.com>
Date: Thu, 19 Nov 2020 12:11:46 +0000
Subject: [PATCH 09/44] ACPI/IORT: Add RMR memory regions reservation helper

Add a helper function that retrieves RMR memory descriptors
associated with a given IOMMU. This will be used by IOMMU
drivers to setup necessary mappings.

Now that we have this, invoke this from the generic helper
interface.

Signed-off-by: Shameer Kolothum <shameerali.kolothum.thodi@huawei.com>
---
 drivers/acpi/arm64/iort.c | 60 +++++++++++++++++++++++++++++++++++++++
 drivers/iommu/dma-iommu.c |  3 ++
 include/linux/acpi_iort.h |  6 ++++
 3 files changed, 69 insertions(+)

diff --git a/drivers/acpi/arm64/iort.c b/drivers/acpi/arm64/iort.c
index 69a20d7e0c84..8f86779d283a 100644
--- a/drivers/acpi/arm64/iort.c
+++ b/drivers/acpi/arm64/iort.c
@@ -12,6 +12,7 @@
 
 #include <linux/acpi_iort.h>
 #include <linux/bitfield.h>
+#include <linux/dma-iommu.h>
 #include <linux/iommu.h>
 #include <linux/kernel.h>
 #include <linux/list.h>
@@ -843,6 +844,63 @@ static inline int iort_add_device_replay(struct device *dev)
 	return err;
 }
 
+/**
+ * iort_iommu_get_rmrs - Helper to retrieve RMR info associated with IOMMU
+ * @iommu: fwnode for the IOMMU
+ * @head: RMR list head to be populated
+ *
+ * Returns: 0 on success, <0 failure
+ */
+int iort_iommu_get_rmrs(struct fwnode_handle *iommu_fwnode,
+			struct list_head *head)
+{
+	struct iort_rmr_entry *e;
+	struct acpi_iort_node *iommu;
+
+	iommu = iort_get_iort_node(iommu_fwnode);
+	if (!iommu)
+		return 0;
+
+	list_for_each_entry(e, &iort_rmr_list, list) {
+		struct iort_rmr_id *rmr_ids = e->rmr_ids;
+		struct acpi_iort_rmr_desc *rmr_desc;
+		struct iommu_rmr *rmr;
+		u32 *ids, num_ids = 0;
+		int i, j = 0;
+
+		for (i = 0; i < e->rmr_ids_num; i++) {
+			if (rmr_ids[i].smmu == iommu)
+				num_ids++;
+		}
+
+		if (!num_ids)
+			continue;
+
+		ids = kmalloc_array(num_ids, sizeof(*ids), GFP_KERNEL);
+		if (!ids)
+			return -ENOMEM;
+
+		for (i = 0; i < e->rmr_ids_num; i++) {
+			if (rmr_ids[i].smmu == iommu)
+				ids[j++] = rmr_ids[i].sid;
+		}
+
+		rmr_desc = e->rmr_desc;
+		rmr = iommu_dma_alloc_rmr(rmr_desc->base_address,
+					  rmr_desc->length,
+					  ids, num_ids);
+		if (!rmr) {
+			kfree(ids);
+			return -ENOMEM;
+		}
+
+		list_add_tail(&rmr->list, head);
+		kfree(ids);
+	}
+
+	return 0;
+}
+
 /**
  * iort_iommu_msi_get_resv_regions - Reserved region driver helper
  * @dev: Device from iommu_get_resv_regions()
@@ -1113,6 +1171,8 @@ int iort_iommu_msi_get_resv_regions(struct device *dev, struct list_head *head)
 const struct iommu_ops *iort_iommu_configure_id(struct device *dev,
 						const u32 *input_id)
 { return NULL; }
+int iort_iommu_get_rmrs(struct fwnode_handle *fwnode, struct list_head *head)
+{ return 0; }
 #endif
 
 static int nc_dma_get_range(struct device *dev, u64 *size)
diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c
index d73768ecdd1a..aa8304e50786 100644
--- a/drivers/iommu/dma-iommu.c
+++ b/drivers/iommu/dma-iommu.c
@@ -176,6 +176,9 @@ EXPORT_SYMBOL(iommu_dma_get_resv_regions);
 int iommu_dma_get_rmrs(struct fwnode_handle *iommu_fwnode,
 		       struct list_head *list)
 {
+	if (!is_of_node(iommu_fwnode))
+		return iort_iommu_get_rmrs(iommu_fwnode, list);
+
 	return 0;
 }
 EXPORT_SYMBOL(iommu_dma_get_rmrs);
diff --git a/include/linux/acpi_iort.h b/include/linux/acpi_iort.h
index 1a12baa58e40..c837fc6e95fe 100644
--- a/include/linux/acpi_iort.h
+++ b/include/linux/acpi_iort.h
@@ -39,6 +39,8 @@ const struct iommu_ops *iort_iommu_configure_id(struct device *dev,
 						const u32 *id_in);
 int iort_iommu_msi_get_resv_regions(struct device *dev, struct list_head *head);
 phys_addr_t acpi_iort_dma_get_max_cpu_address(void);
+int iort_iommu_get_rmrs(struct fwnode_handle *iommu_fwnode,
+			struct list_head *list);
 #else
 static inline void acpi_iort_init(void) { }
 static inline u32 iort_msi_map_id(struct device *dev, u32 id)
@@ -59,6 +61,10 @@ int iort_iommu_msi_get_resv_regions(struct device *dev, struct list_head *head)
 
 static inline phys_addr_t acpi_iort_dma_get_max_cpu_address(void)
 { return PHYS_ADDR_MAX; }
+static inline
+int iort_iommu_get_rmrs(struct fwnode_handle *iommu_fwnode,
+			struct list_head *list)
+{ return 0; }
 #endif
 
 #endif /* __ACPI_IORT_H__ */
-- 
2.27.0


From 9479d764bc71f0a60f7861359f477af08a4082a1 Mon Sep 17 00:00:00 2001
From: Shameer Kolothum <shameerali.kolothum.thodi@huawei.com>
Date: Thu, 19 Nov 2020 12:11:47 +0000
Subject: [PATCH 10/44] iommu/arm-smmu-v3: Introduce strtab init helper

Introduce a helper to check the sid range and to init the l2 strtab
entries(bypass). This will be useful when we have to initialize the
l2 strtab for RMR SIDs.

Signed-off-by: Shameer Kolothum <shameerali.kolothum.thodi@huawei.com>
---
 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 26 ++++++++++++---------
 1 file changed, 15 insertions(+), 11 deletions(-)

diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
index 7067b7c11626..f8f596c5c086 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
@@ -2308,6 +2308,19 @@ static bool arm_smmu_sid_in_range(struct arm_smmu_device *smmu, u32 sid)
 
 static struct iommu_ops arm_smmu_ops;
 
+static int arm_smmu_init_sid_strtab(struct arm_smmu_device *smmu, u32 sid)
+{
+	/* Check the SIDs are in range of the SMMU and our stream table */
+	if (!arm_smmu_sid_in_range(smmu, sid))
+		return -ERANGE;
+
+	/* Ensure l2 strtab is initialised */
+	if (smmu->features & ARM_SMMU_FEAT_2_LVL_STRTAB)
+		return arm_smmu_init_l2_strtab(smmu, sid);
+
+	return 0;
+}
+
 static struct iommu_device *arm_smmu_probe_device(struct device *dev)
 {
 	int i, ret;
@@ -2336,21 +2349,12 @@ static struct iommu_device *arm_smmu_probe_device(struct device *dev)
 	INIT_LIST_HEAD(&master->bonds);
 	dev_iommu_priv_set(dev, master);
 
-	/* Check the SIDs are in range of the SMMU and our stream table */
 	for (i = 0; i < master->num_sids; i++) {
 		u32 sid = master->sids[i];
 
-		if (!arm_smmu_sid_in_range(smmu, sid)) {
-			ret = -ERANGE;
+		ret = arm_smmu_init_sid_strtab(smmu, sid);
+		if (ret)
 			goto err_free_master;
-		}
-
-		/* Ensure l2 strtab is initialised */
-		if (smmu->features & ARM_SMMU_FEAT_2_LVL_STRTAB) {
-			ret = arm_smmu_init_l2_strtab(smmu, sid);
-			if (ret)
-				goto err_free_master;
-		}
 	}
 
 	master->ssid_bits = min(smmu->ssid_bits, fwspec->num_pasid_bits);
-- 
2.27.0


From d7e16ba5576168effd83fa2ba11204492b9b0c2a Mon Sep 17 00:00:00 2001
From: Shameer Kolothum <shameerali.kolothum.thodi@huawei.com>
Date: Thu, 19 Nov 2020 12:11:48 +0000
Subject: [PATCH 11/44] =?UTF-8?q?iommu/arm-smmu-v3:=20Add=20bypass=20flag?=
 =?UTF-8?q?=20to=C2=A0arm=5Fsmmu=5Fwrite=5Fstrtab=5Fent()?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

By default, disable_bypass is set and any dev without an iommu domain
installs STE with CFG_ABORT during arm_smmu_init_bypass_stes(). Introduce
a "bypass" flag to arm_smmu_write_strtab_ent() so that we can force it to
install CFG_BYPASS STE for specific SIDs. This will be useful for RMR
related SIDs.

Signed-off-by: Shameer Kolothum <shameerali.kolothum.thodi@huawei.com>
---
 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
index f8f596c5c086..8988c63e7c00 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
@@ -1174,7 +1174,7 @@ static void arm_smmu_sync_ste_for_sid(struct arm_smmu_device *smmu, u32 sid)
 }
 
 static void arm_smmu_write_strtab_ent(struct arm_smmu_master *master, u32 sid,
-				      __le64 *dst)
+				      __le64 *dst, bool bypass)
 {
 	/*
 	 * This is hideously complicated, but we only really care about
@@ -1245,7 +1245,7 @@ static void arm_smmu_write_strtab_ent(struct arm_smmu_master *master, u32 sid,
 
 	/* Bypass/fault */
 	if (!smmu_domain || !(s1_cfg || s2_cfg)) {
-		if (!smmu_domain && disable_bypass)
+		if (!smmu_domain && disable_bypass && !bypass)
 			val |= FIELD_PREP(STRTAB_STE_0_CFG, STRTAB_STE_0_CFG_ABORT);
 		else
 			val |= FIELD_PREP(STRTAB_STE_0_CFG, STRTAB_STE_0_CFG_BYPASS);
@@ -1317,7 +1317,7 @@ static void arm_smmu_init_bypass_stes(__le64 *strtab, unsigned int nent)
 	unsigned int i;
 
 	for (i = 0; i < nent; ++i) {
-		arm_smmu_write_strtab_ent(NULL, -1, strtab);
+		arm_smmu_write_strtab_ent(NULL, -1, strtab, false);
 		strtab += STRTAB_STE_DWORDS;
 	}
 }
@@ -2038,7 +2038,7 @@ static void arm_smmu_install_ste_for_dev(struct arm_smmu_master *master)
 		if (j < i)
 			continue;
 
-		arm_smmu_write_strtab_ent(master, sid, step);
+		arm_smmu_write_strtab_ent(master, sid, step, false);
 	}
 }
 
-- 
2.27.0


From eb04e7b17294dce306a446662f8f3a1b313d27ba Mon Sep 17 00:00:00 2001
From: Shameer Kolothum <shameerali.kolothum.thodi@huawei.com>
Date: Thu, 19 Nov 2020 12:11:49 +0000
Subject: [PATCH 12/44] iommu/arm-smmu-v3: Get associated RMR info and install
 bypass STE
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Check if there is any RMR info associated with the devices behind
the SMMUv3 and if any, install bypass STEs for them. This is to
keep any ongoing traffic associated with these devices alive
when we enable/reset SMMUv3 during probe().

Signed-off-by: Shameer Kolothum <shameerali.kolothum.thodi@huawei.com>
---
 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 40 +++++++++++++++++++++
 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h |  2 ++
 2 files changed, 42 insertions(+)

diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
index 8988c63e7c00..00f19d37a3df 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
@@ -3486,6 +3486,42 @@ static void __iomem *arm_smmu_ioremap(struct device *dev, resource_size_t start,
 	return devm_ioremap_resource(dev, &res);
 }
 
+static void arm_smmu_rmr_install_bypass_ste(struct arm_smmu_device *smmu)
+{
+	struct iommu_rmr *e;
+	int i, ret;
+
+	/*
+	 * Since, we don't have a mechanism to differentiate the RMR
+	 * SIDs that has an ongoing live stream, install bypass STEs
+	 * for all the reported ones. 
+	 * FixMe: Avoid duplicate SIDs in the list as one sid may
+	 *        associate with multiple RMRs.
+	 */
+	list_for_each_entry(e, &smmu->rmr_list, list) {
+		for (i = 0; i < e->num_ids; i++) {
+			__le64 *step;
+			u32 sid = e->ids[i];
+
+			ret = arm_smmu_init_sid_strtab(smmu, sid);
+			if (ret) {
+				dev_err(smmu->dev, "RMR bypass(0x%x) failed\n",
+					sid);
+				continue;
+			}
+
+			step = arm_smmu_get_step_for_sid(smmu, sid);
+			arm_smmu_write_strtab_ent(NULL, sid, step, true);
+		}
+	}
+}
+
+static int arm_smmu_get_rmr(struct arm_smmu_device *smmu)
+{
+	INIT_LIST_HEAD(&smmu->rmr_list);
+	return iommu_dma_get_rmrs(dev_fwnode(smmu->dev), &smmu->rmr_list);
+}
+
 static int arm_smmu_device_probe(struct platform_device *pdev)
 {
 	int irq, ret;
@@ -3569,6 +3605,10 @@ static int arm_smmu_device_probe(struct platform_device *pdev)
 	/* Record our private device structure */
 	platform_set_drvdata(pdev, smmu);
 
+	/* Check for RMRs and install bypass STEs if any */
+	if (!arm_smmu_get_rmr(smmu))
+		arm_smmu_rmr_install_bypass_ste(smmu);
+
 	/* Reset the device */
 	ret = arm_smmu_device_reset(smmu, bypass);
 	if (ret)
diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
index d4b7f40ccb02..17b517ddecee 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
@@ -636,6 +636,8 @@ struct arm_smmu_device {
 
 	/* IOMMU core code handle */
 	struct iommu_device		iommu;
+
+	struct list_head		rmr_list;
 };
 
 /* SMMU private data for each master */
-- 
2.27.0


From c9fa17c72291b8dda67cee25a45de65283391483 Mon Sep 17 00:00:00 2001
From: Shameer Kolothum <shameerali.kolothum.thodi@huawei.com>
Date: Thu, 19 Nov 2020 12:11:50 +0000
Subject: [PATCH 13/44] =?UTF-8?q?iommu/arm-smmu-v3:=20Reserve=20any=20RMR?=
 =?UTF-8?q?=20regions=20associated=20with=20a=C2=A0dev?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Get RMR regions associated with a dev reserved so that there is
a unity mapping for them in SMMU.

Signed-off-by: Shameer Kolothum <shameerali.kolothum.thodi@huawei.com>
---
 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 38 +++++++++++++++++++++
 1 file changed, 38 insertions(+)

diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
index 00f19d37a3df..23c0c4d5ad09 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
@@ -2492,6 +2492,43 @@ static int arm_smmu_of_xlate(struct device *dev, struct of_phandle_args *args)
 	return iommu_fwspec_add_ids(dev, args->args, 1);
 }
 
+static bool arm_smmu_dev_has_rmr(struct arm_smmu_master *master,
+				 struct iommu_rmr *e)
+{
+	int i, j;
+
+	for (i = 0; i < master->num_sids; i++) {
+		for (j = 0; j < e->num_ids; j++) {
+			if (e->ids[j] == master->sids[i])
+				return true;
+		}
+	}
+
+	return false;
+}
+
+static void arm_smmu_rmr_get_resv_regions(struct device *dev,
+					  struct list_head *head)
+{
+	struct arm_smmu_master *master = dev_iommu_priv_get(dev);
+	struct arm_smmu_device *smmu = master->smmu;
+	struct iommu_rmr *rmr;
+
+	list_for_each_entry(rmr, &smmu->rmr_list, list) {
+		struct iommu_resv_region *region;
+		int prot = IOMMU_READ | IOMMU_WRITE | IOMMU_NOEXEC | IOMMU_MMIO;
+
+		if (!arm_smmu_dev_has_rmr(master, rmr))
+			continue;
+		region = iommu_alloc_resv_region(rmr->base_address,
+						 rmr->length, prot,
+						 IOMMU_RESV_DIRECT);
+		if (!region)
+			return;
+
+		list_add_tail(&region->list, head);
+	}
+}
 static void arm_smmu_get_resv_regions(struct device *dev,
 				      struct list_head *head)
 {
@@ -2506,6 +2543,7 @@ static void arm_smmu_get_resv_regions(struct device *dev,
 	list_add_tail(&region->list, head);
 
 	iommu_dma_get_resv_regions(dev, head);
+	arm_smmu_rmr_get_resv_regions(dev, head);
 }
 
 static bool arm_smmu_dev_has_feature(struct device *dev,
-- 
2.27.0


From 1a4c374e2cf1ae43fb8638cb9b8ebb918e1794a1 Mon Sep 17 00:00:00 2001
From: Jon Nettleton <jon@solid-run.com>
Date: Fri, 18 Dec 2020 05:04:43 -0500
Subject: [PATCH 14/44] iommu/arm-smmu: Get associated RMR info and install
 bypass SMR
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Check if there is any RMR info associated with the devices behind
the SMMU and if any, install bypass SMRs for them. This is to
keep any ongoing traffic associated with these devices alive
when we enable/reset SMMU during probe().

Signed-off-by: Jon Nettleton <jon@solid-run.com>
---
 drivers/iommu/arm/arm-smmu/arm-smmu.c | 44 +++++++++++++++++++++++++++
 drivers/iommu/arm/arm-smmu/arm-smmu.h |  2 ++
 2 files changed, 46 insertions(+)

diff --git a/drivers/iommu/arm/arm-smmu/arm-smmu.c b/drivers/iommu/arm/arm-smmu/arm-smmu.c
index bcbacf22331d..338850966fe8 100644
--- a/drivers/iommu/arm/arm-smmu/arm-smmu.c
+++ b/drivers/iommu/arm/arm-smmu/arm-smmu.c
@@ -2095,6 +2095,45 @@ err_reset_platform_ops: __maybe_unused;
 	return err;
 }
 
+static void arm_smmu_rmr_install_bypass_smr(struct arm_smmu_device *smmu)
+{
+	struct iommu_rmr *e;
+	int i, j, cnt = 0;
+	u32 smr;
+
+	for (i = 0; i < smmu->num_mapping_groups; i++) {
+		smr = arm_smmu_gr0_read(smmu, ARM_SMMU_GR0_SMR(i));
+		if (!FIELD_GET(ARM_SMMU_SMR_VALID, smr))
+			continue;
+
+		list_for_each_entry(e, &smmu->rmr_list, list) {
+			for (j = 0; j < e->num_ids; j++) {
+				if (FIELD_GET(ARM_SMMU_SMR_ID, smr) != e->ids[j])
+					continue;
+
+				smmu->smrs[i].id = FIELD_GET(ARM_SMMU_SMR_ID, smr);
+				smmu->smrs[i].mask = FIELD_GET(ARM_SMMU_SMR_MASK, smr);
+				smmu->smrs[i].valid = true;
+
+				smmu->s2crs[i].type = S2CR_TYPE_BYPASS;
+				smmu->s2crs[i].privcfg = S2CR_PRIVCFG_DEFAULT;
+				smmu->s2crs[i].cbndx = 0xff;
+
+				cnt++;
+			}
+		}
+	}
+
+	dev_notice(smmu->dev, "\tpreserved %d boot mapping%s\n", cnt,
+		cnt == 1 ? "" : "s");
+}
+
+static int arm_smmu_get_rmr(struct arm_smmu_device *smmu)
+{
+	INIT_LIST_HEAD(&smmu->rmr_list);
+	return iommu_dma_get_rmrs(dev_fwnode(smmu->dev), &smmu->rmr_list);
+}
+
 static int arm_smmu_device_probe(struct platform_device *pdev)
 {
 	struct resource *res;
@@ -2224,6 +2263,11 @@ static int arm_smmu_device_probe(struct platform_device *pdev)
 	}
 
 	platform_set_drvdata(pdev, smmu);
+
+	/* Check for RMRs and install bypass SMRs if any */
+	if (!arm_smmu_get_rmr(smmu))
+		arm_smmu_rmr_install_bypass_smr(smmu);
+
 	arm_smmu_device_reset(smmu);
 	arm_smmu_test_smr_masks(smmu);
 
diff --git a/drivers/iommu/arm/arm-smmu/arm-smmu.h b/drivers/iommu/arm/arm-smmu/arm-smmu.h
index b71647eaa319..a3c3442e7d4c 100644
--- a/drivers/iommu/arm/arm-smmu/arm-smmu.h
+++ b/drivers/iommu/arm/arm-smmu/arm-smmu.h
@@ -325,6 +325,8 @@ struct arm_smmu_device {
 
 	/* IOMMU core code handle */
 	struct iommu_device		iommu;
+
+	struct list_head		rmr_list;
 };
 
 enum arm_smmu_context_fmt {
-- 
2.27.0


From 27aae2dfb64e6f5d0263c28bc6001e84cd857253 Mon Sep 17 00:00:00 2001
From: Jon Nettleton <jon@solid-run.com>
Date: Fri, 18 Dec 2020 05:06:31 -0500
Subject: [PATCH 15/44] =?UTF-8?q?iommu/arm-smmu:=20Reserve=20any=20RMR=20r?=
 =?UTF-8?q?egions=20associated=20with=20a=C2=A0dev?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Get RMR regions associated with a dev reserved so that there is
a unity mapping for them in SMMU.

Signed-off-by: Jon Nettleton <jon@solid-run.com>
---
 drivers/iommu/arm/arm-smmu/arm-smmu.c | 43 +++++++++++++++++++++++++++
 1 file changed, 43 insertions(+)

diff --git a/drivers/iommu/arm/arm-smmu/arm-smmu.c b/drivers/iommu/arm/arm-smmu/arm-smmu.c
index 338850966fe8..183960395579 100644
--- a/drivers/iommu/arm/arm-smmu/arm-smmu.c
+++ b/drivers/iommu/arm/arm-smmu/arm-smmu.c
@@ -1584,6 +1584,48 @@ static int arm_smmu_of_xlate(struct device *dev, struct of_phandle_args *args)
 	return iommu_fwspec_add_ids(dev, &fwid, 1);
 }
 
+static bool arm_smmu_dev_has_rmr(struct arm_smmu_master_cfg *cfg,
+				 struct iommu_fwspec *fwspec,
+				 struct iommu_rmr *e)
+{
+	struct arm_smmu_device *smmu = cfg->smmu;
+	struct arm_smmu_smr *smrs = smmu->smrs;
+	int i, idx, j;
+
+	for_each_cfg_sme(cfg, fwspec, i, idx) {
+		for (j = 0; j < e->num_ids; j++) {
+			if (e->ids[j] == smrs[idx].id)
+				return true;
+		}
+	}
+
+	return false;
+}
+
+static void arm_smmu_rmr_get_resv_regions(struct device *dev,
+					  struct list_head *head)
+{
+	struct arm_smmu_master_cfg *cfg = dev_iommu_priv_get(dev);
+	struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
+	struct arm_smmu_device *smmu = cfg->smmu;
+	struct iommu_rmr *rmr;
+
+	list_for_each_entry(rmr, &smmu->rmr_list, list) {
+		struct iommu_resv_region *region;
+		int prot = IOMMU_READ | IOMMU_WRITE | IOMMU_NOEXEC | IOMMU_MMIO;
+
+		if (!arm_smmu_dev_has_rmr(cfg, fwspec, rmr))
+			continue;
+		region = iommu_alloc_resv_region(rmr->base_address,
+						 rmr->length, prot,
+						 IOMMU_RESV_DIRECT);
+		if (!region)
+			return;
+
+		list_add_tail(&region->list, head);
+	}
+}
+
 static void arm_smmu_get_resv_regions(struct device *dev,
 				      struct list_head *head)
 {
@@ -1598,6 +1640,7 @@ static void arm_smmu_get_resv_regions(struct device *dev,
 	list_add_tail(&region->list, head);
 
 	iommu_dma_get_resv_regions(dev, head);
+	arm_smmu_rmr_get_resv_regions(dev, head);
 }
 
 static int arm_smmu_def_domain_type(struct device *dev)
-- 
2.27.0


From 6b1e54549e8190821f7d85a6eac7d0bdae75613a Mon Sep 17 00:00:00 2001
From: Ioana Ciornei <ioana.ciornei@nxp.com>
Date: Fri, 8 Jan 2021 11:07:22 +0200
Subject: [PATCH 16/44] dpaa2-mac: split up initializing the MAC object from
 connecting to it

Split up the initialization phase of the dpmac object from actually
configuring the phylink instance, connecting to it and configuring the
MAC. This is done so that even though the dpni object is connected to a
dpmac which has link management handled by the firmware we are still
able to export the MAC counters.

Signed-off-by: Ioana Ciornei <ioana.ciornei@nxp.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
---
 .../net/ethernet/freescale/dpaa2/dpaa2-eth.c  | 14 +++-
 .../net/ethernet/freescale/dpaa2/dpaa2-mac.c  | 69 +++++++++++--------
 .../net/ethernet/freescale/dpaa2/dpaa2-mac.h  |  5 ++
 3 files changed, 59 insertions(+), 29 deletions(-)

diff --git a/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c b/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c
index f91c67489e62..0351b2b65bff 100644
--- a/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c
+++ b/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c
@@ -4066,15 +4066,24 @@ static int dpaa2_eth_connect_mac(struct dpaa2_eth_priv *priv)
 	mac->mc_io = priv->mc_io;
 	mac->net_dev = priv->net_dev;
 
+	err = dpaa2_mac_open(mac);
+	if (err)
+		goto err_free_mac;
+
 	err = dpaa2_mac_connect(mac);
 	if (err) {
 		netdev_err(priv->net_dev, "Error connecting to the MAC endpoint\n");
-		kfree(mac);
-		return err;
+		goto err_close_mac;
 	}
 	priv->mac = mac;
 
 	return 0;
+
+err_close_mac:
+	dpaa2_mac_close(mac);
+err_free_mac:
+	kfree(mac);
+	return err;
 }
 
 static void dpaa2_eth_disconnect_mac(struct dpaa2_eth_priv *priv)
@@ -4083,6 +4092,7 @@ static void dpaa2_eth_disconnect_mac(struct dpaa2_eth_priv *priv)
 		return;
 
 	dpaa2_mac_disconnect(priv->mac);
+	dpaa2_mac_close(priv->mac);
 	kfree(priv->mac);
 	priv->mac = NULL;
 }
diff --git a/drivers/net/ethernet/freescale/dpaa2/dpaa2-mac.c b/drivers/net/ethernet/freescale/dpaa2/dpaa2-mac.c
index 828c177df03d..50dd302abcf4 100644
--- a/drivers/net/ethernet/freescale/dpaa2/dpaa2-mac.c
+++ b/drivers/net/ethernet/freescale/dpaa2/dpaa2-mac.c
@@ -302,36 +302,20 @@ static void dpaa2_pcs_destroy(struct dpaa2_mac *mac)
 
 int dpaa2_mac_connect(struct dpaa2_mac *mac)
 {
-	struct fsl_mc_device *dpmac_dev = mac->mc_dev;
 	struct net_device *net_dev = mac->net_dev;
 	struct device_node *dpmac_node;
 	struct phylink *phylink;
-	struct dpmac_attr attr;
 	int err;
 
-	err = dpmac_open(mac->mc_io, 0, dpmac_dev->obj_desc.id,
-			 &dpmac_dev->mc_handle);
-	if (err || !dpmac_dev->mc_handle) {
-		netdev_err(net_dev, "dpmac_open() = %d\n", err);
-		return -ENODEV;
-	}
-
-	err = dpmac_get_attributes(mac->mc_io, 0, dpmac_dev->mc_handle, &attr);
-	if (err) {
-		netdev_err(net_dev, "dpmac_get_attributes() = %d\n", err);
-		goto err_close_dpmac;
-	}
-
-	mac->if_link_type = attr.link_type;
+	mac->if_link_type = mac->attr.link_type;
 
-	dpmac_node = dpaa2_mac_get_node(attr.id);
+	dpmac_node = dpaa2_mac_get_node(mac->attr.id);
 	if (!dpmac_node) {
-		netdev_err(net_dev, "No dpmac@%d node found.\n", attr.id);
-		err = -ENODEV;
-		goto err_close_dpmac;
+		netdev_err(net_dev, "No dpmac@%d node found.\n", mac->attr.id);
+		return -ENODEV;
 	}
 
-	err = dpaa2_mac_get_if_mode(dpmac_node, attr);
+	err = dpaa2_mac_get_if_mode(dpmac_node, mac->attr);
 	if (err < 0) {
 		err = -EINVAL;
 		goto err_put_node;
@@ -351,9 +335,9 @@ int dpaa2_mac_connect(struct dpaa2_mac *mac)
 		goto err_put_node;
 	}
 
-	if (attr.link_type == DPMAC_LINK_TYPE_PHY &&
-	    attr.eth_if != DPMAC_ETH_IF_RGMII) {
-		err = dpaa2_pcs_create(mac, dpmac_node, attr.id);
+	if (mac->attr.link_type == DPMAC_LINK_TYPE_PHY &&
+	    mac->attr.eth_if != DPMAC_ETH_IF_RGMII) {
+		err = dpaa2_pcs_create(mac, dpmac_node, mac->attr.id);
 		if (err)
 			goto err_put_node;
 	}
@@ -389,8 +373,7 @@ int dpaa2_mac_connect(struct dpaa2_mac *mac)
 	dpaa2_pcs_destroy(mac);
 err_put_node:
 	of_node_put(dpmac_node);
-err_close_dpmac:
-	dpmac_close(mac->mc_io, 0, dpmac_dev->mc_handle);
+
 	return err;
 }
 
@@ -402,8 +385,40 @@ void dpaa2_mac_disconnect(struct dpaa2_mac *mac)
 	phylink_disconnect_phy(mac->phylink);
 	phylink_destroy(mac->phylink);
 	dpaa2_pcs_destroy(mac);
+}
+
+int dpaa2_mac_open(struct dpaa2_mac *mac)
+{
+	struct fsl_mc_device *dpmac_dev = mac->mc_dev;
+	struct net_device *net_dev = mac->net_dev;
+	int err;
+
+	err = dpmac_open(mac->mc_io, 0, dpmac_dev->obj_desc.id,
+			 &dpmac_dev->mc_handle);
+	if (err || !dpmac_dev->mc_handle) {
+		netdev_err(net_dev, "dpmac_open() = %d\n", err);
+		return -ENODEV;
+	}
+
+	err = dpmac_get_attributes(mac->mc_io, 0, dpmac_dev->mc_handle,
+				   &mac->attr);
+	if (err) {
+		netdev_err(net_dev, "dpmac_get_attributes() = %d\n", err);
+		goto err_close_dpmac;
+	}
+
+	return 0;
+
+err_close_dpmac:
+	dpmac_close(mac->mc_io, 0, dpmac_dev->mc_handle);
+	return err;
+}
+
+void dpaa2_mac_close(struct dpaa2_mac *mac)
+{
+	struct fsl_mc_device *dpmac_dev = mac->mc_dev;
 
-	dpmac_close(mac->mc_io, 0, mac->mc_dev->mc_handle);
+	dpmac_close(mac->mc_io, 0, dpmac_dev->mc_handle);
 }
 
 static char dpaa2_mac_ethtool_stats[][ETH_GSTRING_LEN] = {
diff --git a/drivers/net/ethernet/freescale/dpaa2/dpaa2-mac.h b/drivers/net/ethernet/freescale/dpaa2/dpaa2-mac.h
index 955a52856210..13d42dd58ec9 100644
--- a/drivers/net/ethernet/freescale/dpaa2/dpaa2-mac.h
+++ b/drivers/net/ethernet/freescale/dpaa2/dpaa2-mac.h
@@ -17,6 +17,7 @@ struct dpaa2_mac {
 	struct dpmac_link_state state;
 	struct net_device *net_dev;
 	struct fsl_mc_io *mc_io;
+	struct dpmac_attr attr;
 
 	struct phylink_config phylink_config;
 	struct phylink *phylink;
@@ -28,6 +29,10 @@ struct dpaa2_mac {
 bool dpaa2_mac_is_type_fixed(struct fsl_mc_device *dpmac_dev,
 			     struct fsl_mc_io *mc_io);
 
+int dpaa2_mac_open(struct dpaa2_mac *mac);
+
+void dpaa2_mac_close(struct dpaa2_mac *mac);
+
 int dpaa2_mac_connect(struct dpaa2_mac *mac);
 
 void dpaa2_mac_disconnect(struct dpaa2_mac *mac);
-- 
2.27.0


From 0f95faffc5d299ede2605a3415ccbaca0b593498 Mon Sep 17 00:00:00 2001
From: Calvin Johnson <calvin.johnson@oss.nxp.com>
Date: Thu, 11 Mar 2021 11:49:56 +0530
Subject: [PATCH 17/44] Documentation: ACPI: DSD: Document MDIO PHY

Introduce ACPI mechanism to get PHYs registered on a MDIO bus and
provide them to be connected to MAC.

Describe properties "phy-handle" and "phy-mode".

Signed-off-by: Calvin Johnson <calvin.johnson@oss.nxp.com>
---
 Documentation/firmware-guide/acpi/dsd/phy.rst | 133 ++++++++++++++++++
 1 file changed, 133 insertions(+)
 create mode 100644 Documentation/firmware-guide/acpi/dsd/phy.rst

diff --git a/Documentation/firmware-guide/acpi/dsd/phy.rst b/Documentation/firmware-guide/acpi/dsd/phy.rst
new file mode 100644
index 000000000000..7d01ae8b3cc6
--- /dev/null
+++ b/Documentation/firmware-guide/acpi/dsd/phy.rst
@@ -0,0 +1,133 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+=========================
+MDIO bus and PHYs in ACPI
+=========================
+
+The PHYs on an MDIO bus [1] are probed and registered using
+fwnode_mdiobus_register_phy().
+
+Later, for connecting these PHYs to their respective MACs, the PHYs registered
+on the MDIO bus have to be referenced.
+
+This document introduces two _DSD properties that are to be used
+for connecting PHYs on the MDIO bus [3] to the MAC layer.
+
+These properties are defined in accordance with the "Device
+Properties UUID For _DSD" [2] document and the
+daffd814-6eba-4d8c-8a91-bc9bbf4aa301 UUID must be used in the Device
+Data Descriptors containing them.
+
+phy-handle
+----------
+For each MAC node, a device property "phy-handle" is used to reference
+the PHY that is registered on an MDIO bus. This is mandatory for
+network interfaces that have PHYs connected to MAC via MDIO bus.
+
+During the MDIO bus driver initialization, PHYs on this bus are probed
+using the _ADR object as shown below and are registered on the MDIO bus.
+
+::
+      Scope(\_SB.MDI0)
+      {
+        Device(PHY1) {
+          Name (_ADR, 0x1)
+        } // end of PHY1
+
+        Device(PHY2) {
+          Name (_ADR, 0x2)
+        } // end of PHY2
+      }
+
+Later, during the MAC driver initialization, the registered PHY devices
+have to be retrieved from the MDIO bus. For this, the MAC driver needs
+references to the previously registered PHYs which are provided
+as device object references (e.g. \_SB.MDI0.PHY1).
+
+phy-mode
+--------
+The "phy-mode" _DSD property is used to describe the connection to
+the PHY. The valid values for "phy-mode" are defined in [4].
+
+The following ASL example illustrates the usage of these properties.
+
+DSDT entry for MDIO node
+------------------------
+
+The MDIO bus has an SoC component (MDIO controller) and a platform
+component (PHYs on the MDIO bus).
+
+a) Silicon Component
+This node describes the MDIO controller, MDI0
+---------------------------------------------
+::
+	Scope(_SB)
+	{
+	  Device(MDI0) {
+	    Name(_HID, "NXP0006")
+	    Name(_CCA, 1)
+	    Name(_UID, 0)
+	    Name(_CRS, ResourceTemplate() {
+	      Memory32Fixed(ReadWrite, MDI0_BASE, MDI_LEN)
+	      Interrupt(ResourceConsumer, Level, ActiveHigh, Shared)
+	       {
+		 MDI0_IT
+	       }
+	    }) // end of _CRS for MDI0
+	  } // end of MDI0
+	}
+
+b) Platform Component
+The PHY1 and PHY2 nodes represent the PHYs connected to MDIO bus MDI0
+---------------------------------------------------------------------
+::
+	Scope(\_SB.MDI0)
+	{
+	  Device(PHY1) {
+	    Name (_ADR, 0x1)
+	  } // end of PHY1
+
+	  Device(PHY2) {
+	    Name (_ADR, 0x2)
+	  } // end of PHY2
+	}
+
+DSDT entries representing MAC nodes
+-----------------------------------
+
+Below are the MAC nodes where PHY nodes are referenced.
+phy-mode and phy-handle are used as explained earlier.
+------------------------------------------------------
+::
+	Scope(\_SB.MCE0.PR17)
+	{
+	  Name (_DSD, Package () {
+	     ToUUID("daffd814-6eba-4d8c-8a91-bc9bbf4aa301"),
+		 Package () {
+		     Package (2) {"phy-mode", "rgmii-id"},
+		     Package (2) {"phy-handle", \_SB.MDI0.PHY1}
+	      }
+	   })
+	}
+
+	Scope(\_SB.MCE0.PR18)
+	{
+	  Name (_DSD, Package () {
+	    ToUUID("daffd814-6eba-4d8c-8a91-bc9bbf4aa301"),
+		Package () {
+		    Package (2) {"phy-mode", "rgmii-id"},
+		    Package (2) {"phy-handle", \_SB.MDI0.PHY2}}
+	    }
+	  })
+	}
+
+References
+==========
+
+[1] Documentation/networking/phy.rst
+
+[2] https://www.uefi.org/sites/default/files/resources/_DSD-device-properties-UUID.pdf
+
+[3] Documentation/firmware-guide/acpi/DSD-properties-rules.rst
+
+[4] Documentation/devicetree/bindings/net/ethernet-controller.yaml
-- 
2.27.0


From e1f94e1daf554db196203f2430fd0a9532980a53 Mon Sep 17 00:00:00 2001
From: Calvin Johnson <calvin.johnson@oss.nxp.com>
Date: Thu, 11 Mar 2021 11:49:57 +0530
Subject: [PATCH 18/44] net: phy: Introduce fwnode_mdio_find_device()

Define fwnode_mdio_find_device() to get a pointer to the
mdio_device from fwnode passed to the function.

Refactor of_mdio_find_device() to use fwnode_mdio_find_device().

Signed-off-by: Calvin Johnson <calvin.johnson@oss.nxp.com>
---
 drivers/net/mdio/of_mdio.c   | 11 +----------
 drivers/net/phy/phy_device.c | 23 +++++++++++++++++++++++
 include/linux/phy.h          |  6 ++++++
 3 files changed, 30 insertions(+), 10 deletions(-)

diff --git a/drivers/net/mdio/of_mdio.c b/drivers/net/mdio/of_mdio.c
index 4daf94bb56a5..7bd33b930116 100644
--- a/drivers/net/mdio/of_mdio.c
+++ b/drivers/net/mdio/of_mdio.c
@@ -347,16 +347,7 @@ EXPORT_SYMBOL(of_mdiobus_register);
  */
 struct mdio_device *of_mdio_find_device(struct device_node *np)
 {
-	struct device *d;
-
-	if (!np)
-		return NULL;
-
-	d = bus_find_device_by_of_node(&mdio_bus_type, np);
-	if (!d)
-		return NULL;
-
-	return to_mdio_device(d);
+	return fwnode_mdio_find_device(of_fwnode_handle(np));
 }
 EXPORT_SYMBOL(of_mdio_find_device);
 
diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c
index dd1f711140c3..aff42e17d441 100644
--- a/drivers/net/phy/phy_device.c
+++ b/drivers/net/phy/phy_device.c
@@ -2806,6 +2806,29 @@ static bool phy_drv_supports_irq(struct phy_driver *phydrv)
 	return phydrv->config_intr && phydrv->ack_interrupt;
 }
 
+/**
+ * fwnode_mdio_find_device - Given a fwnode, find the mdio_device
+ * @fwnode: pointer to the mdio_device's fwnode
+ *
+ * If successful, returns a pointer to the mdio_device with the embedded
+ * struct device refcount incremented by one, or NULL on failure.
+ * The caller should call put_device() on the mdio_device after its use.
+ */
+struct mdio_device *fwnode_mdio_find_device(struct fwnode_handle *fwnode)
+{
+	struct device *d;
+
+	if (!fwnode)
+		return NULL;
+
+	d = bus_find_device_by_fwnode(&mdio_bus_type, fwnode);
+	if (!d)
+		return NULL;
+
+	return to_mdio_device(d);
+}
+EXPORT_SYMBOL(fwnode_mdio_find_device);
+
 /**
  * phy_probe - probe and init a PHY device
  * @dev: device to probe and init
diff --git a/include/linux/phy.h b/include/linux/phy.h
index 56563e5e0dc7..a90b0eb55481 100644
--- a/include/linux/phy.h
+++ b/include/linux/phy.h
@@ -1350,11 +1350,17 @@ struct phy_device *phy_device_create(struct mii_bus *bus, int addr, u32 phy_id,
 				     bool is_c45,
 				     struct phy_c45_device_ids *c45_ids);
 #if IS_ENABLED(CONFIG_PHYLIB)
+struct mdio_device *fwnode_mdio_find_device(struct fwnode_handle *fwnode);
 struct phy_device *get_phy_device(struct mii_bus *bus, int addr, bool is_c45);
 int phy_device_register(struct phy_device *phy);
 void phy_device_free(struct phy_device *phydev);
 #else
 static inline
+struct mdio_device *fwnode_mdio_find_device(struct fwnode_handle *fwnode)
+{
+	return 0;
+}
+static inline
 struct phy_device *get_phy_device(struct mii_bus *bus, int addr, bool is_c45)
 {
 	return NULL;
-- 
2.27.0


From ab37ac2fa7c18374312c11b5583cb64b1ad0095c Mon Sep 17 00:00:00 2001
From: Calvin Johnson <calvin.johnson@oss.nxp.com>
Date: Thu, 11 Mar 2021 11:49:58 +0530
Subject: [PATCH 19/44] net: phy: Introduce phy related fwnode functions

Define fwnode_phy_find_device() to iterate an mdiobus and find the
phy device of the provided phy fwnode. Additionally define
device_phy_find_device() to find phy device of provided device.

Define fwnode_get_phy_node() to get phy_node using named reference.

Signed-off-by: Calvin Johnson <calvin.johnson@oss.nxp.com>
---
 drivers/net/phy/phy_device.c | 62 ++++++++++++++++++++++++++++++++++++
 include/linux/phy.h          | 20 ++++++++++++
 2 files changed, 82 insertions(+)

diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c
index aff42e17d441..662c388a77f5 100644
--- a/drivers/net/phy/phy_device.c
+++ b/drivers/net/phy/phy_device.c
@@ -9,6 +9,7 @@
 
 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 
+#include <linux/acpi.h>
 #include <linux/bitmap.h>
 #include <linux/delay.h>
 #include <linux/errno.h>
@@ -2829,6 +2830,67 @@ struct mdio_device *fwnode_mdio_find_device(struct fwnode_handle *fwnode)
 }
 EXPORT_SYMBOL(fwnode_mdio_find_device);
 
+/**
+ * fwnode_phy_find_device - For provided phy_fwnode, find phy_device.
+ *
+ * @phy_fwnode: Pointer to the phy's fwnode.
+ *
+ * If successful, returns a pointer to the phy_device with the embedded
+ * struct device refcount incremented by one, or NULL on failure.
+ */
+struct phy_device *fwnode_phy_find_device(struct fwnode_handle *phy_fwnode)
+{
+	struct mdio_device *mdiodev;
+
+	mdiodev = fwnode_mdio_find_device(phy_fwnode);
+	if (!mdiodev)
+		return NULL;
+
+	if (mdiodev->flags & MDIO_DEVICE_FLAG_PHY)
+		return to_phy_device(&mdiodev->dev);
+
+	put_device(&mdiodev->dev);
+
+	return NULL;
+}
+EXPORT_SYMBOL(fwnode_phy_find_device);
+
+/**
+ * device_phy_find_device - For the given device, get the phy_device
+ * @dev: Pointer to the given device
+ *
+ * Refer return conditions of fwnode_phy_find_device().
+ */
+struct phy_device *device_phy_find_device(struct device *dev)
+{
+	return fwnode_phy_find_device(dev_fwnode(dev));
+}
+EXPORT_SYMBOL_GPL(device_phy_find_device);
+
+/**
+ * fwnode_get_phy_node - Get the phy_node using the named reference.
+ * @fwnode: Pointer to fwnode from which phy_node has to be obtained.
+ *
+ * Refer return conditions of fwnode_find_reference().
+ * For ACPI, only "phy-handle" is supported. Legacy DT properties "phy"
+ * and "phy-device" are not supported in ACPI. DT supports all the three
+ * named references to the phy node.
+ */
+struct fwnode_handle *fwnode_get_phy_node(struct fwnode_handle *fwnode)
+{
+	struct fwnode_handle *phy_node;
+
+	/* Only phy-handle is used for ACPI */
+	phy_node = fwnode_find_reference(fwnode, "phy-handle", 0);
+	if (is_acpi_node(fwnode) || !IS_ERR(phy_node))
+		return phy_node;
+	phy_node = fwnode_find_reference(fwnode, "phy", 0);
+	if (IS_ERR(phy_node))
+		phy_node = fwnode_find_reference(fwnode, "phy-device", 0);
+	return phy_node;
+}
+EXPORT_SYMBOL_GPL(fwnode_get_phy_node);
+
 /**
  * phy_probe - probe and init a PHY device
  * @dev: device to probe and init
diff --git a/include/linux/phy.h b/include/linux/phy.h
index a90b0eb55481..40b231a12f54 100644
--- a/include/linux/phy.h
+++ b/include/linux/phy.h
@@ -1351,6 +1351,9 @@ struct phy_device *phy_device_create(struct mii_bus *bus, int addr, u32 phy_id,
 				     struct phy_c45_device_ids *c45_ids);
 #if IS_ENABLED(CONFIG_PHYLIB)
 struct mdio_device *fwnode_mdio_find_device(struct fwnode_handle *fwnode);
+struct phy_device *fwnode_phy_find_device(struct fwnode_handle *phy_fwnode);
+struct phy_device *device_phy_find_device(struct device *dev);
+struct fwnode_handle *fwnode_get_phy_node(struct fwnode_handle *fwnode);
 struct phy_device *get_phy_device(struct mii_bus *bus, int addr, bool is_c45);
 int phy_device_register(struct phy_device *phy);
 void phy_device_free(struct phy_device *phydev);
@@ -1360,6 +1363,23 @@ struct mdio_device *fwnode_mdio_find_device(struct fwnode_handle *fwnode)
 {
 	return 0;
 }
+static inline
+struct phy_device *fwnode_phy_find_device(struct fwnode_handle *phy_fwnode)
+{
+	return NULL;
+}
+
+static inline struct phy_device *device_phy_find_device(struct device *dev)
+{
+	return NULL;
+}
+
+static inline
+struct fwnode_handle *fwnode_get_phy_node(struct fwnode_handle *fwnode)
+{
+	return NULL;
+}
+
 static inline
 struct phy_device *get_phy_device(struct mii_bus *bus, int addr, bool is_c45)
 {
-- 
2.27.0


From b58a8a23b8c692adfb1f264f0555052e618fad44 Mon Sep 17 00:00:00 2001
From: Calvin Johnson <calvin.johnson@oss.nxp.com>
Date: Thu, 11 Mar 2021 11:49:59 +0530
Subject: [PATCH 20/44] of: mdio: Refactor of_phy_find_device()

Refactor of_phy_find_device() to use fwnode_phy_find_device().

Signed-off-by: Calvin Johnson <calvin.johnson@oss.nxp.com>
---
 drivers/net/mdio/of_mdio.c | 13 +------------
 1 file changed, 1 insertion(+), 12 deletions(-)

diff --git a/drivers/net/mdio/of_mdio.c b/drivers/net/mdio/of_mdio.c
index 7bd33b930116..94ec421dd91b 100644
--- a/drivers/net/mdio/of_mdio.c
+++ b/drivers/net/mdio/of_mdio.c
@@ -360,18 +360,7 @@ EXPORT_SYMBOL(of_mdio_find_device);
  */
 struct phy_device *of_phy_find_device(struct device_node *phy_np)
 {
-	struct mdio_device *mdiodev;
-
-	mdiodev = of_mdio_find_device(phy_np);
-	if (!mdiodev)
-		return NULL;
-
-	if (mdiodev->flags & MDIO_DEVICE_FLAG_PHY)
-		return to_phy_device(&mdiodev->dev);
-
-	put_device(&mdiodev->dev);
-
-	return NULL;
+	return fwnode_phy_find_device(of_fwnode_handle(phy_np));
 }
 EXPORT_SYMBOL(of_phy_find_device);
 
-- 
2.27.0


From efdd10e3f8be334e77592201bba65ff4395d75ef Mon Sep 17 00:00:00 2001
From: Calvin Johnson <calvin.johnson@oss.nxp.com>
Date: Thu, 11 Mar 2021 11:50:00 +0530
Subject: [PATCH 21/44] net: phy: Introduce fwnode_get_phy_id()

Extract phy_id from compatible string. This will be used by
fwnode_mdiobus_register_phy() to create phy device using the
phy_id.

Signed-off-by: Calvin Johnson <calvin.johnson@oss.nxp.com>
---
 drivers/net/phy/phy_device.c | 21 +++++++++++++++++++++
 include/linux/phy.h          |  5 +++++
 2 files changed, 26 insertions(+)

diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c
index 662c388a77f5..5d0ad64b4673 100644
--- a/drivers/net/phy/phy_device.c
+++ b/drivers/net/phy/phy_device.c
@@ -817,6 +817,27 @@ static int get_phy_c22_id(struct mii_bus *bus, int addr, u32 *phy_id)
 	return 0;
 }
 
+/* Extract the phy ID from the compatible string of the form
+ * ethernet-phy-idAAAA.BBBB.
+ */
+int fwnode_get_phy_id(struct fwnode_handle *fwnode, u32 *phy_id)
+{
+	unsigned int upper, lower;
+	const char *cp;
+	int ret;
+
+	ret = fwnode_property_read_string(fwnode, "compatible", &cp);
+	if (ret)
+		return ret;
+
+	if (sscanf(cp, "ethernet-phy-id%4x.%4x", &upper, &lower) != 2)
+		return -EINVAL;
+
+	*phy_id = ((upper & GENMASK(15, 0)) << 16) | (lower & GENMASK(15, 0));
+	return 0;
+}
+EXPORT_SYMBOL(fwnode_get_phy_id);
+
 /**
  * get_phy_device - reads the specified PHY device and returns its @phy_device
  *		    struct
diff --git a/include/linux/phy.h b/include/linux/phy.h
index 40b231a12f54..d0c5d9034689 100644
--- a/include/linux/phy.h
+++ b/include/linux/phy.h
@@ -1350,6 +1350,7 @@ struct phy_device *phy_device_create(struct mii_bus *bus, int addr, u32 phy_id,
 				     bool is_c45,
 				     struct phy_c45_device_ids *c45_ids);
 #if IS_ENABLED(CONFIG_PHYLIB)
+int fwnode_get_phy_id(struct fwnode_handle *fwnode, u32 *phy_id);
 struct mdio_device *fwnode_mdio_find_device(struct fwnode_handle *fwnode);
 struct phy_device *fwnode_phy_find_device(struct fwnode_handle *phy_fwnode);
 struct phy_device *device_phy_find_device(struct device *dev);
@@ -1358,6 +1359,10 @@ struct phy_device *get_phy_device(struct mii_bus *bus, int addr, bool is_c45);
 int phy_device_register(struct phy_device *phy);
 void phy_device_free(struct phy_device *phydev);
 #else
+static inline int fwnode_get_phy_id(struct fwnode_handle *fwnode, u32 *phy_id)
+{
+	return 0;
+}
 static inline
 struct mdio_device *fwnode_mdio_find_device(struct fwnode_handle *fwnode)
 {
-- 
2.27.0


From 2a11e8cb084e0db52b971e1e0076b0f832163b8b Mon Sep 17 00:00:00 2001
From: Calvin Johnson <calvin.johnson@oss.nxp.com>
Date: Thu, 11 Mar 2021 11:50:01 +0530
Subject: [PATCH 22/44] of: mdio: Refactor of_get_phy_id()

With the introduction of fwnode_get_phy_id(), refactor of_get_phy_id()
to use fwnode equivalent.

Signed-off-by: Calvin Johnson <calvin.johnson@oss.nxp.com>
---
 drivers/net/mdio/of_mdio.c | 12 +-----------
 1 file changed, 1 insertion(+), 11 deletions(-)

diff --git a/drivers/net/mdio/of_mdio.c b/drivers/net/mdio/of_mdio.c
index 94ec421dd91b..d4cc293358f7 100644
--- a/drivers/net/mdio/of_mdio.c
+++ b/drivers/net/mdio/of_mdio.c
@@ -29,17 +29,7 @@ MODULE_LICENSE("GPL");
  * ethernet-phy-idAAAA.BBBB */
 static int of_get_phy_id(struct device_node *device, u32 *phy_id)
 {
-	struct property *prop;
-	const char *cp;
-	unsigned int upper, lower;
-
-	of_property_for_each_string(device, "compatible", prop, cp) {
-		if (sscanf(cp, "ethernet-phy-id%4x.%4x", &upper, &lower) == 2) {
-			*phy_id = ((upper & 0xFFFF) << 16) | (lower & 0xFFFF);
-			return 0;
-		}
-	}
-	return -EINVAL;
+	return fwnode_get_phy_id(of_fwnode_handle(device), phy_id);
 }
 
 static struct mii_timestamper *of_find_mii_timestamper(struct device_node *node)
-- 
2.27.0


From ee93bf13699df3eeee369d403166708bc2a9a775 Mon Sep 17 00:00:00 2001
From: Calvin Johnson <calvin.johnson@oss.nxp.com>
Date: Thu, 11 Mar 2021 11:50:02 +0530
Subject: [PATCH 23/44] net: mii_timestamper: check NULL in
 unregister_mii_timestamper()

Callers of unregister_mii_timestamper() currently check for NULL
value of mii_ts before calling it.

Place the NULL check inside unregister_mii_timestamper() and update
the callers accordingly.

Signed-off-by: Calvin Johnson <calvin.johnson@oss.nxp.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
---
 drivers/net/mdio/of_mdio.c        | 6 ++----
 drivers/net/phy/mii_timestamper.c | 3 +++
 drivers/net/phy/phy_device.c      | 3 +--
 3 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/drivers/net/mdio/of_mdio.c b/drivers/net/mdio/of_mdio.c
index d4cc293358f7..c926442dca82 100644
--- a/drivers/net/mdio/of_mdio.c
+++ b/drivers/net/mdio/of_mdio.c
@@ -115,15 +115,13 @@ static int of_mdiobus_register_phy(struct mii_bus *mdio,
 	else
 		phy = get_phy_device(mdio, addr, is_c45);
 	if (IS_ERR(phy)) {
-		if (mii_ts)
-			unregister_mii_timestamper(mii_ts);
+		unregister_mii_timestamper(mii_ts);
 		return PTR_ERR(phy);
 	}
 
 	rc = of_mdiobus_phy_device_register(mdio, phy, child, addr);
 	if (rc) {
-		if (mii_ts)
-			unregister_mii_timestamper(mii_ts);
+		unregister_mii_timestamper(mii_ts);
 		phy_device_free(phy);
 		return rc;
 	}
diff --git a/drivers/net/phy/mii_timestamper.c b/drivers/net/phy/mii_timestamper.c
index b71b7456462d..51ae0593a04f 100644
--- a/drivers/net/phy/mii_timestamper.c
+++ b/drivers/net/phy/mii_timestamper.c
@@ -111,6 +111,9 @@ void unregister_mii_timestamper(struct mii_timestamper *mii_ts)
 	struct mii_timestamping_desc *desc;
 	struct list_head *this;
 
+	if (!mii_ts)
+		return;
+
 	/* mii_timestamper statically registered by the PHY driver won't use the
 	 * register_mii_timestamper() and thus don't have ->device set. Don't
 	 * try to unregister these.
diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c
index 5d0ad64b4673..9f6b449cf388 100644
--- a/drivers/net/phy/phy_device.c
+++ b/drivers/net/phy/phy_device.c
@@ -928,8 +928,7 @@ EXPORT_SYMBOL(phy_device_register);
  */
 void phy_device_remove(struct phy_device *phydev)
 {
-	if (phydev->mii_ts)
-		unregister_mii_timestamper(phydev->mii_ts);
+	unregister_mii_timestamper(phydev->mii_ts);
 
 	device_del(&phydev->mdio.dev);
 
-- 
2.27.0


From 19cd8ebabe432b4d49438403a25532cdf2f21e3b Mon Sep 17 00:00:00 2001
From: Calvin Johnson <calvin.johnson@oss.nxp.com>
Date: Thu, 11 Mar 2021 11:50:03 +0530
Subject: [PATCH 24/44] net: mdiobus: Introduce fwnode_mdiobus_register_phy()

Introduce fwnode_mdiobus_register_phy() to register PHYs on the
mdiobus. From the compatible string, identify whether the PHY is
c45 and based on this create a PHY device instance which is
registered on the mdiobus.

uninitialized symbol 'mii_ts'
Reported-by: kernel test robot <lkp@intel.com>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>

Signed-off-by: Calvin Johnson <calvin.johnson@oss.nxp.com>
---
 MAINTAINERS                    |  1 +
 drivers/net/mdio/Kconfig       |  9 ++++
 drivers/net/mdio/Makefile      |  3 +-
 drivers/net/mdio/fwnode_mdio.c | 77 ++++++++++++++++++++++++++++++++++
 drivers/net/mdio/of_mdio.c     |  3 +-
 include/linux/fwnode_mdio.h    | 24 +++++++++++
 include/linux/of_mdio.h        |  6 ++-
 7 files changed, 120 insertions(+), 3 deletions(-)
 create mode 100644 drivers/net/mdio/fwnode_mdio.c
 create mode 100644 include/linux/fwnode_mdio.h

diff --git a/MAINTAINERS b/MAINTAINERS
index 281de213ef47..821adf657115 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -6585,6 +6585,7 @@ F:	Documentation/devicetree/bindings/net/mdio*
 F:	Documentation/devicetree/bindings/net/qca,ar803x.yaml
 F:	Documentation/networking/phy.rst
 F:	drivers/net/mdio/
+F:	drivers/net/mdio/fwnode_mdio.c
 F:	drivers/net/mdio/of_mdio.c
 F:	drivers/net/pcs/
 F:	drivers/net/phy/
diff --git a/drivers/net/mdio/Kconfig b/drivers/net/mdio/Kconfig
index a10cc460d7cf..2d5bf5ccffb5 100644
--- a/drivers/net/mdio/Kconfig
+++ b/drivers/net/mdio/Kconfig
@@ -19,6 +19,14 @@ config MDIO_BUS
 	  reflects whether the mdio_bus/mdio_device code is built as a
 	  loadable module or built-in.
 
+config FWNODE_MDIO
+	def_tristate PHYLIB
+	depends on OF
+	depends on PHYLIB
+	select FIXED_PHY
+	help
+	  FWNODE MDIO bus (Ethernet PHY) accessors
+
 config OF_MDIO
 	def_tristate PHYLIB
 	depends on OF
diff --git a/drivers/net/mdio/Makefile b/drivers/net/mdio/Makefile
index 5c498dde463f..ea5390e2ef84 100644
--- a/drivers/net/mdio/Makefile
+++ b/drivers/net/mdio/Makefile
@@ -1,7 +1,8 @@
 # SPDX-License-Identifier: GPL-2.0
 # Makefile for Linux MDIO bus drivers
 
-obj-$(CONFIG_OF_MDIO)	+= of_mdio.o
+obj-$(CONFIG_FWNODE_MDIO)	+= fwnode_mdio.o
+obj-$(CONFIG_OF_MDIO)		+= of_mdio.o
 
 obj-$(CONFIG_MDIO_ASPEED)		+= mdio-aspeed.o
 obj-$(CONFIG_MDIO_BCM_IPROC)		+= mdio-bcm-iproc.o
diff --git a/drivers/net/mdio/fwnode_mdio.c b/drivers/net/mdio/fwnode_mdio.c
new file mode 100644
index 000000000000..0982e816a6fb
--- /dev/null
+++ b/drivers/net/mdio/fwnode_mdio.c
@@ -0,0 +1,77 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * fwnode helpers for the MDIO (Ethernet PHY) API
+ *
+ * This file provides helper functions for extracting PHY device information
+ * out of the fwnode and using it to populate an mii_bus.
+ */
+
+#include <linux/acpi.h>
+#include <linux/of.h>
+#include <linux/of_mdio.h>
+#include <linux/phy.h>
+
+MODULE_AUTHOR("Calvin Johnson <calvin.johnson@oss.nxp.com>");
+MODULE_LICENSE("GPL");
+
+int fwnode_mdiobus_register_phy(struct mii_bus *bus,
+				struct fwnode_handle *child, u32 addr)
+{
+	struct mii_timestamper *mii_ts = NULL;
+	struct phy_device *phy;
+	bool is_c45 = false;
+	u32 phy_id;
+	int rc;
+
+	if (is_of_node(child)) {
+		mii_ts = of_find_mii_timestamper(to_of_node(child));
+		if (IS_ERR(mii_ts))
+			return PTR_ERR(mii_ts);
+	}
+
+	rc = fwnode_property_match_string(child, "compatible", "ethernet-phy-ieee802.3-c45");
+	if (rc >= 0)
+		is_c45 = true;
+
+	if (is_c45 || fwnode_get_phy_id(child, &phy_id))
+		phy = get_phy_device(bus, addr, is_c45);
+	else
+		phy = phy_device_create(bus, addr, phy_id, 0, NULL);
+	if (IS_ERR(phy)) {
+		unregister_mii_timestamper(mii_ts);
+		return PTR_ERR(phy);
+	}
+
+	if (is_acpi_node(child)) {
+		phy->irq = bus->irq[addr];
+
+		/* Associate the fwnode with the device structure so it
+		 * can be looked up later.
+		 */
+		phy->mdio.dev.fwnode = child;
+
+		/* All data is now stored in the phy struct, so register it */
+		rc = phy_device_register(phy);
+		if (rc) {
+			phy_device_free(phy);
+			fwnode_handle_put(phy->mdio.dev.fwnode);
+			return rc;
+		}
+	} else if (is_of_node(child)) {
+		rc = of_mdiobus_phy_device_register(bus, phy, to_of_node(child), addr);
+		if (rc) {
+			unregister_mii_timestamper(mii_ts);
+			phy_device_free(phy);
+			return rc;
+		}
+	}
+
+	/* phy->mii_ts may already be defined by the PHY driver. A
+	 * mii_timestamper probed via the device tree will still have
+	 * precedence.
+	 */
+	if (mii_ts)
+		phy->mii_ts = mii_ts;
+	return 0;
+}
+EXPORT_SYMBOL(fwnode_mdiobus_register_phy);
diff --git a/drivers/net/mdio/of_mdio.c b/drivers/net/mdio/of_mdio.c
index c926442dca82..932912c585c0 100644
--- a/drivers/net/mdio/of_mdio.c
+++ b/drivers/net/mdio/of_mdio.c
@@ -32,7 +32,7 @@ static int of_get_phy_id(struct device_node *device, u32 *phy_id)
 	return fwnode_get_phy_id(of_fwnode_handle(device), phy_id);
 }
 
-static struct mii_timestamper *of_find_mii_timestamper(struct device_node *node)
+struct mii_timestamper *of_find_mii_timestamper(struct device_node *node)
 {
 	struct of_phandle_args arg;
 	int err;
@@ -49,6 +49,7 @@ static struct mii_timestamper *of_find_mii_timestamper(struct device_node *node)
 
 	return register_mii_timestamper(arg.np, arg.args[0]);
 }
+EXPORT_SYMBOL(of_find_mii_timestamper);
 
 int of_mdiobus_phy_device_register(struct mii_bus *mdio, struct phy_device *phy,
 			      struct device_node *child, u32 addr)
diff --git a/include/linux/fwnode_mdio.h b/include/linux/fwnode_mdio.h
new file mode 100644
index 000000000000..8c0392845916
--- /dev/null
+++ b/include/linux/fwnode_mdio.h
@@ -0,0 +1,24 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * FWNODE helper for the MDIO (Ethernet PHY) API
+ */
+
+#ifndef __LINUX_FWNODE_MDIO_H
+#define __LINUX_FWNODE_MDIO_H
+
+#include <linux/phy.h>
+
+#if IS_ENABLED(CONFIG_FWNODE_MDIO)
+int fwnode_mdiobus_register_phy(struct mii_bus *bus,
+				struct fwnode_handle *child, u32 addr);
+
+#else /* CONFIG_FWNODE_MDIO */
+static inline int fwnode_mdiobus_register_phy(struct mii_bus *bus,
+					      struct fwnode_handle *child,
+					      u32 addr)
+{
+	return -EINVAL;
+}
+#endif
+
+#endif /* __LINUX_FWNODE_MDIO_H */
diff --git a/include/linux/of_mdio.h b/include/linux/of_mdio.h
index cfe8c607a628..3b66016f18aa 100644
--- a/include/linux/of_mdio.h
+++ b/include/linux/of_mdio.h
@@ -34,6 +34,7 @@ struct mii_bus *of_mdio_find_bus(struct device_node *mdio_np);
 int of_phy_register_fixed_link(struct device_node *np);
 void of_phy_deregister_fixed_link(struct device_node *np);
 bool of_phy_is_fixed_link(struct device_node *np);
+struct mii_timestamper *of_find_mii_timestamper(struct device_node *np);
 int of_mdiobus_phy_device_register(struct mii_bus *mdio, struct phy_device *phy,
 				   struct device_node *child, u32 addr);
 
@@ -128,7 +129,10 @@ static inline bool of_phy_is_fixed_link(struct device_node *np)
 {
 	return false;
 }
-
+static inline struct mii_timestamper *of_find_mii_timestamper(struct device_node *np)
+{
+	return NULL;
+}
 static inline int of_mdiobus_phy_device_register(struct mii_bus *mdio,
 					    struct phy_device *phy,
 					    struct device_node *child, u32 addr)
-- 
2.27.0


From 91d4b9891111f2cdab14930a44c43ee91c70ecc0 Mon Sep 17 00:00:00 2001
From: Calvin Johnson <calvin.johnson@oss.nxp.com>
Date: Thu, 11 Mar 2021 11:50:04 +0530
Subject: [PATCH 25/44] of: mdio: Refactor of_mdiobus_register_phy()

Refactor of_mdiobus_register_phy() to use fwnode_mdiobus_register_phy().

Signed-off-by: Calvin Johnson <calvin.johnson@oss.nxp.com>
---
 drivers/net/mdio/of_mdio.c | 39 ++------------------------------------
 1 file changed, 2 insertions(+), 37 deletions(-)

diff --git a/drivers/net/mdio/of_mdio.c b/drivers/net/mdio/of_mdio.c
index 932912c585c0..513afdd5e0ab 100644
--- a/drivers/net/mdio/of_mdio.c
+++ b/drivers/net/mdio/of_mdio.c
@@ -12,6 +12,7 @@
 #include <linux/device.h>
 #include <linux/netdevice.h>
 #include <linux/err.h>
+#include <linux/fwnode_mdio.h>
 #include <linux/phy.h>
 #include <linux/phy_fixed.h>
 #include <linux/of.h>
@@ -98,43 +99,7 @@ EXPORT_SYMBOL(of_mdiobus_phy_device_register);
 static int of_mdiobus_register_phy(struct mii_bus *mdio,
 				    struct device_node *child, u32 addr)
 {
-	struct mii_timestamper *mii_ts;
-	struct phy_device *phy;
-	bool is_c45;
-	int rc;
-	u32 phy_id;
-
-	mii_ts = of_find_mii_timestamper(child);
-	if (IS_ERR(mii_ts))
-		return PTR_ERR(mii_ts);
-
-	is_c45 = of_device_is_compatible(child,
-					 "ethernet-phy-ieee802.3-c45");
-
-	if (!is_c45 && !of_get_phy_id(child, &phy_id))
-		phy = phy_device_create(mdio, addr, phy_id, 0, NULL);
-	else
-		phy = get_phy_device(mdio, addr, is_c45);
-	if (IS_ERR(phy)) {
-		unregister_mii_timestamper(mii_ts);
-		return PTR_ERR(phy);
-	}
-
-	rc = of_mdiobus_phy_device_register(mdio, phy, child, addr);
-	if (rc) {
-		unregister_mii_timestamper(mii_ts);
-		phy_device_free(phy);
-		return rc;
-	}
-
-	/* phy->mii_ts may already be defined by the PHY driver. A
-	 * mii_timestamper probed via the device tree will still have
-	 * precedence.
-	 */
-	if (mii_ts)
-		phy->mii_ts = mii_ts;
-
-	return 0;
+	return fwnode_mdiobus_register_phy(mdio, of_fwnode_handle(child), addr);
 }
 
 static int of_mdiobus_register_device(struct mii_bus *mdio,
-- 
2.27.0


From 80efa126324583a3f0117e93f6bc9fea8871518e Mon Sep 17 00:00:00 2001
From: Calvin Johnson <calvin.johnson@oss.nxp.com>
Date: Thu, 11 Mar 2021 11:50:05 +0530
Subject: [PATCH 26/44] ACPI: utils: Introduce acpi_get_local_address()

Introduce a wrapper around the _ADR evaluation.

Signed-off-by: Calvin Johnson <calvin.johnson@oss.nxp.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
---
 drivers/acpi/utils.c | 14 ++++++++++++++
 include/linux/acpi.h |  7 +++++++
 2 files changed, 21 insertions(+)

diff --git a/drivers/acpi/utils.c b/drivers/acpi/utils.c
index d5411a166685..0d3a2b111c0f 100644
--- a/drivers/acpi/utils.c
+++ b/drivers/acpi/utils.c
@@ -296,6 +296,20 @@ acpi_evaluate_integer(acpi_handle handle,
 
 EXPORT_SYMBOL(acpi_evaluate_integer);
 
+int acpi_get_local_address(acpi_handle handle, u32 *addr)
+{
+	unsigned long long adr;
+	acpi_status status;
+
+	status = acpi_evaluate_integer(handle, METHOD_NAME__ADR, NULL, &adr);
+	if (ACPI_FAILURE(status))
+		return -ENODATA;
+
+	*addr = (u32)adr;
+	return 0;
+}
+EXPORT_SYMBOL(acpi_get_local_address);
+
 acpi_status
 acpi_evaluate_reference(acpi_handle handle,
 			acpi_string pathname,
diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index 5b1dc1ad4fb3..f62724b3849c 100644
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -703,6 +703,8 @@ static inline u64 acpi_arch_get_root_pointer(void)
 }
 #endif
 
+int acpi_get_local_address(acpi_handle handle, u32 *addr);
+
 #else	/* !CONFIG_ACPI */
 
 #define acpi_disabled 1
@@ -953,6 +955,11 @@ static inline struct acpi_device *acpi_resource_consumer(struct resource *res)
 	return NULL;
 }
 
+static inline int acpi_get_local_address(acpi_handle handle, u32 *addr)
+{
+	return -ENODEV;
+}
+
 #endif	/* !CONFIG_ACPI */
 
 #ifdef CONFIG_ACPI_HOTPLUG_IOAPIC
-- 
2.27.0


From d0808b96b36584f5358fd466d87cfa5924161674 Mon Sep 17 00:00:00 2001
From: Calvin Johnson <calvin.johnson@oss.nxp.com>
Date: Thu, 11 Mar 2021 11:50:06 +0530
Subject: [PATCH 27/44] net: mdio: Add ACPI support code for mdio

Define acpi_mdiobus_register() to Register mii_bus and create PHYs for
each ACPI child node.

Signed-off-by: Calvin Johnson <calvin.johnson@oss.nxp.com>
---
 MAINTAINERS                  |  1 +
 drivers/net/mdio/Kconfig     |  7 +++++
 drivers/net/mdio/Makefile    |  1 +
 drivers/net/mdio/acpi_mdio.c | 56 ++++++++++++++++++++++++++++++++++++
 include/linux/acpi_mdio.h    | 25 ++++++++++++++++
 5 files changed, 90 insertions(+)
 create mode 100644 drivers/net/mdio/acpi_mdio.c
 create mode 100644 include/linux/acpi_mdio.h

diff --git a/MAINTAINERS b/MAINTAINERS
index 821adf657115..79be0e518f45 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -6585,6 +6585,7 @@ F:	Documentation/devicetree/bindings/net/mdio*
 F:	Documentation/devicetree/bindings/net/qca,ar803x.yaml
 F:	Documentation/networking/phy.rst
 F:	drivers/net/mdio/
+F:	drivers/net/mdio/acpi_mdio.c
 F:	drivers/net/mdio/fwnode_mdio.c
 F:	drivers/net/mdio/of_mdio.c
 F:	drivers/net/pcs/
diff --git a/drivers/net/mdio/Kconfig b/drivers/net/mdio/Kconfig
index 2d5bf5ccffb5..fc8c787b448f 100644
--- a/drivers/net/mdio/Kconfig
+++ b/drivers/net/mdio/Kconfig
@@ -36,6 +36,13 @@ config OF_MDIO
 	help
 	  OpenFirmware MDIO bus (Ethernet PHY) accessors
 
+config ACPI_MDIO
+	def_tristate PHYLIB
+	depends on ACPI
+	depends on PHYLIB
+	help
+	  ACPI MDIO bus (Ethernet PHY) accessors
+
 if MDIO_BUS
 
 config MDIO_DEVRES
diff --git a/drivers/net/mdio/Makefile b/drivers/net/mdio/Makefile
index ea5390e2ef84..e8b739a3df1c 100644
--- a/drivers/net/mdio/Makefile
+++ b/drivers/net/mdio/Makefile
@@ -1,6 +1,7 @@
 # SPDX-License-Identifier: GPL-2.0
 # Makefile for Linux MDIO bus drivers
 
+obj-$(CONFIG_ACPI_MDIO)		+= acpi_mdio.o
 obj-$(CONFIG_FWNODE_MDIO)	+= fwnode_mdio.o
 obj-$(CONFIG_OF_MDIO)		+= of_mdio.o
 
diff --git a/drivers/net/mdio/acpi_mdio.c b/drivers/net/mdio/acpi_mdio.c
new file mode 100644
index 000000000000..60a86e3fc246
--- /dev/null
+++ b/drivers/net/mdio/acpi_mdio.c
@@ -0,0 +1,56 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * ACPI helpers for the MDIO (Ethernet PHY) API
+ *
+ * This file provides helper functions for extracting PHY device information
+ * out of the ACPI ASL and using it to populate an mii_bus.
+ */
+
+#include <linux/acpi.h>
+#include <linux/acpi_mdio.h>
+#include <linux/bits.h>
+#include <linux/dev_printk.h>
+#include <linux/fwnode_mdio.h>
+#include <linux/module.h>
+#include <linux/types.h>
+
+MODULE_AUTHOR("Calvin Johnson <calvin.johnson@oss.nxp.com>");
+MODULE_LICENSE("GPL");
+
+/**
+ * acpi_mdiobus_register - Register mii_bus and create PHYs from the ACPI ASL.
+ * @mdio: pointer to mii_bus structure
+ * @fwnode: pointer to fwnode of MDIO bus.
+ *
+ * This function registers the mii_bus structure and registers a phy_device
+ * for each child node of @fwnode.
+ */
+int acpi_mdiobus_register(struct mii_bus *mdio, struct fwnode_handle *fwnode)
+{
+	struct fwnode_handle *child;
+	u32 addr;
+	int ret;
+
+	/* Mask out all PHYs from auto probing. */
+	mdio->phy_mask = GENMASK(31, 0);
+	ret = mdiobus_register(mdio);
+	if (ret)
+		return ret;
+
+	ACPI_COMPANION_SET(&mdio->dev, to_acpi_device_node(fwnode));
+
+	/* Loop over the child nodes and register a phy_device for each PHY */
+	fwnode_for_each_child_node(fwnode, child) {
+		ret = acpi_get_local_address(ACPI_HANDLE_FWNODE(child), &addr);
+		if (ret || addr >= PHY_MAX_ADDR)
+			continue;
+
+		ret = fwnode_mdiobus_register_phy(mdio, child, addr);
+		if (ret == -ENODEV)
+			dev_err(&mdio->dev,
+				"MDIO device at address %d is missing.\n",
+				addr);
+	}
+	return 0;
+}
+EXPORT_SYMBOL(acpi_mdiobus_register);
diff --git a/include/linux/acpi_mdio.h b/include/linux/acpi_mdio.h
new file mode 100644
index 000000000000..748d261fe2f9
--- /dev/null
+++ b/include/linux/acpi_mdio.h
@@ -0,0 +1,25 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * ACPI helper for the MDIO (Ethernet PHY) API
+ */
+
+#ifndef __LINUX_ACPI_MDIO_H
+#define __LINUX_ACPI_MDIO_H
+
+#include <linux/phy.h>
+
+#if IS_ENABLED(CONFIG_ACPI_MDIO)
+int acpi_mdiobus_register(struct mii_bus *mdio, struct fwnode_handle *fwnode);
+#else /* CONFIG_ACPI_MDIO */
+static inline int acpi_mdiobus_register(struct mii_bus *mdio, struct fwnode_handle *fwnode)
+{
+	/*
+	 * Fall back to mdiobus_register() function to register a bus.
+	 * This way, we don't have to keep compat bits around in drivers.
+	 */
+
+	return mdiobus_register(mdio);
+}
+#endif
+
+#endif /* __LINUX_ACPI_MDIO_H */
-- 
2.27.0


From 24beb04f83e410fbb746f7a69f1f0911dc22cc8b Mon Sep 17 00:00:00 2001
From: Calvin Johnson <calvin.johnson@oss.nxp.com>
Date: Thu, 11 Mar 2021 11:50:07 +0530
Subject: [PATCH 28/44] net: mdiobus: Introduce fwnode_mdiobus_register()

Introduce fwnode_mdiobus_register() to register PHYs on the  mdiobus.
If the fwnode is DT node, then call of_mdiobus_register().
If it is an ACPI node, then call acpi_mdiobus_register().

Signed-off-by: Calvin Johnson <calvin.johnson@oss.nxp.com>
---
 drivers/net/mdio/fwnode_mdio.c | 21 +++++++++++++++++++++
 include/linux/fwnode_mdio.h    |  5 +++++
 2 files changed, 26 insertions(+)

diff --git a/drivers/net/mdio/fwnode_mdio.c b/drivers/net/mdio/fwnode_mdio.c
index 0982e816a6fb..523c2778b287 100644
--- a/drivers/net/mdio/fwnode_mdio.c
+++ b/drivers/net/mdio/fwnode_mdio.c
@@ -7,6 +7,7 @@
  */
 
 #include <linux/acpi.h>
+#include <linux/acpi_mdio.h>
 #include <linux/of.h>
 #include <linux/of_mdio.h>
 #include <linux/phy.h>
@@ -75,3 +76,23 @@ int fwnode_mdiobus_register_phy(struct mii_bus *bus,
 	return 0;
 }
 EXPORT_SYMBOL(fwnode_mdiobus_register_phy);
+
+/**
+ * fwnode_mdiobus_register - Register mii_bus and create PHYs from fwnode
+ * @mdio: pointer to mii_bus structure
+ * @fwnode: pointer to fwnode of MDIO bus.
+ *
+ * This function returns of_mdiobus_register() for DT and
+ * acpi_mdiobus_register() for ACPI.
+ */
+int fwnode_mdiobus_register(struct mii_bus *mdio, struct fwnode_handle *fwnode)
+{
+	if (is_of_node(fwnode))
+		return of_mdiobus_register(mdio, to_of_node(fwnode));
+
+	if (is_acpi_node(fwnode))
+		return acpi_mdiobus_register(mdio, fwnode);
+
+	return -EINVAL;
+}
+EXPORT_SYMBOL(fwnode_mdiobus_register);
diff --git a/include/linux/fwnode_mdio.h b/include/linux/fwnode_mdio.h
index 8c0392845916..20f22211260b 100644
--- a/include/linux/fwnode_mdio.h
+++ b/include/linux/fwnode_mdio.h
@@ -12,6 +12,7 @@
 int fwnode_mdiobus_register_phy(struct mii_bus *bus,
 				struct fwnode_handle *child, u32 addr);
 
+int fwnode_mdiobus_register(struct mii_bus *mdio, struct fwnode_handle *fwnode);
 #else /* CONFIG_FWNODE_MDIO */
 static inline int fwnode_mdiobus_register_phy(struct mii_bus *bus,
 					      struct fwnode_handle *child,
@@ -19,6 +20,10 @@ static inline int fwnode_mdiobus_register_phy(struct mii_bus *bus,
 {
 	return -EINVAL;
 }
+static int fwnode_mdiobus_register(struct mii_bus *mdio, struct fwnode_handle *fwnode)
+{
+	return -EINVAL;
+}
 #endif
 
 #endif /* __LINUX_FWNODE_MDIO_H */
-- 
2.27.0


From c5597d49b769cf06689afd2266d109c94c6a46d9 Mon Sep 17 00:00:00 2001
From: Calvin Johnson <calvin.johnson@oss.nxp.com>
Date: Thu, 11 Mar 2021 11:50:08 +0530
Subject: [PATCH 29/44] net/fsl: Use fwnode_mdiobus_register()

fwnode_mdiobus_register() internally takes care of both DT
and ACPI cases to register mdiobus. Replace existing
of_mdiobus_register() with fwnode_mdiobus_register().

Note: For both ACPI and DT cases, endianness of MDIO controller
need to be specified using "little-endian" property.

Signed-off-by: Calvin Johnson <calvin.johnson@oss.nxp.com>
---
 drivers/net/ethernet/freescale/xgmac_mdio.c | 22 ++++++++++++---------
 1 file changed, 13 insertions(+), 9 deletions(-)

diff --git a/drivers/net/ethernet/freescale/xgmac_mdio.c b/drivers/net/ethernet/freescale/xgmac_mdio.c
index bfa2826c5545..6daf1fb2e9ea 100644
--- a/drivers/net/ethernet/freescale/xgmac_mdio.c
+++ b/drivers/net/ethernet/freescale/xgmac_mdio.c
@@ -2,6 +2,7 @@
  * QorIQ 10G MDIO Controller
  *
  * Copyright 2012 Freescale Semiconductor, Inc.
+ * Copyright 2021 NXP
  *
  * Authors: Andy Fleming <afleming@freescale.com>
  *          Timur Tabi <timur@freescale.com>
@@ -11,15 +12,16 @@
  * kind, whether express or implied.
  */
 
-#include <linux/kernel.h>
-#include <linux/slab.h>
+#include <linux/fwnode_mdio.h>
 #include <linux/interrupt.h>
-#include <linux/module.h>
-#include <linux/phy.h>
+#include <linux/kernel.h>
 #include <linux/mdio.h>
+#include <linux/module.h>
 #include <linux/of_address.h>
-#include <linux/of_platform.h>
 #include <linux/of_mdio.h>
+#include <linux/of_platform.h>
+#include <linux/phy.h>
+#include <linux/slab.h>
 
 /* Number of microseconds to wait for a register to respond */
 #define TIMEOUT	1000
@@ -243,10 +245,9 @@ static int xgmac_mdio_read(struct mii_bus *bus, int phy_id, int regnum)
 
 static int xgmac_mdio_probe(struct platform_device *pdev)
 {
-	struct device_node *np = pdev->dev.of_node;
-	struct mii_bus *bus;
-	struct resource *res;
 	struct mdio_fsl_priv *priv;
+	struct resource *res;
+	struct mii_bus *bus;
 	int ret;
 
 	/* In DPAA-1, MDIO is one of the many FMan sub-devices. The FMan
@@ -279,13 +280,16 @@ static int xgmac_mdio_probe(struct platform_device *pdev)
 		goto err_ioremap;
 	}
 
+	/* For both ACPI and DT cases, endianness of MDIO controller
+	 * needs to be specified using "little-endian" property.
+	 */
 	priv->is_little_endian = device_property_read_bool(&pdev->dev,
 							   "little-endian");
 
 	priv->has_a011043 = device_property_read_bool(&pdev->dev,
 						      "fsl,erratum-a011043");
 
-	ret = of_mdiobus_register(bus, np);
+	ret = fwnode_mdiobus_register(bus, pdev->dev.fwnode);
 	if (ret) {
 		dev_err(&pdev->dev, "cannot register MDIO bus\n");
 		goto err_registration;
-- 
2.27.0


From 13745fcb80857b1402c788e1d16e39f622c36866 Mon Sep 17 00:00:00 2001
From: Calvin Johnson <calvin.johnson@oss.nxp.com>
Date: Thu, 11 Mar 2021 11:50:09 +0530
Subject: [PATCH 30/44] net: phylink: introduce phylink_fwnode_phy_connect()

Define phylink_fwnode_phy_connect() to connect phy specified by
a fwnode to a phylink instance.

Signed-off-by: Calvin Johnson <calvin.johnson@oss.nxp.com>
---
 drivers/net/phy/phylink.c | 54 +++++++++++++++++++++++++++++++++++++++
 include/linux/phylink.h   |  3 +++
 2 files changed, 57 insertions(+)

diff --git a/drivers/net/phy/phylink.c b/drivers/net/phy/phylink.c
index fe2296fdda19..479ffbf335a3 100644
--- a/drivers/net/phy/phylink.c
+++ b/drivers/net/phy/phylink.c
@@ -5,6 +5,7 @@
  *
  * Copyright (C) 2015 Russell King
  */
+#include <linux/acpi.h>
 #include <linux/ethtool.h>
 #include <linux/export.h>
 #include <linux/gpio/consumer.h>
@@ -1120,6 +1121,59 @@ int phylink_of_phy_connect(struct phylink *pl, struct device_node *dn,
 }
 EXPORT_SYMBOL_GPL(phylink_of_phy_connect);
 
+/**
+ * phylink_fwnode_phy_connect() - connect the PHY specified in the fwnode.
+ * @pl: a pointer to a &struct phylink returned from phylink_create()
+ * @fwnode: a pointer to a &struct fwnode_handle.
+ * @flags: PHY-specific flags to communicate to the PHY device driver
+ *
+ * Connect the phy specified @fwnode to the phylink instance specified
+ * by @pl.
+ *
+ * Returns 0 on success or a negative errno.
+ */
+int phylink_fwnode_phy_connect(struct phylink *pl,
+			       struct fwnode_handle *fwnode,
+			       u32 flags)
+{
+	struct fwnode_handle *phy_fwnode;
+	struct phy_device *phy_dev;
+	int ret;
+
+	/* Fixed links and 802.3z are handled without needing a PHY */
+	if (pl->cfg_link_an_mode == MLO_AN_FIXED ||
+	    (pl->cfg_link_an_mode == MLO_AN_INBAND &&
+	     phy_interface_mode_is_8023z(pl->link_interface)))
+		return 0;
+
+	phy_fwnode = fwnode_get_phy_node(fwnode);
+	if (IS_ERR(phy_fwnode)) {
+		if (pl->cfg_link_an_mode == MLO_AN_PHY)
+			return -ENODEV;
+		return 0;
+	}
+
+	phy_dev = fwnode_phy_find_device(phy_fwnode);
+	/* We're done with the phy_node handle */
+	fwnode_handle_put(phy_fwnode);
+	if (!phy_dev)
+		return -ENODEV;
+
+	ret = phy_attach_direct(pl->netdev, phy_dev, flags,
+				pl->link_interface);
+	if (ret) {
+		phy_device_free(phy_dev);
+		return ret;
+	}
+
+	ret = phylink_bringup_phy(pl, phy_dev, pl->link_config.interface);
+	if (ret)
+		phy_detach(phy_dev);
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(phylink_fwnode_phy_connect);
+
 /**
  * phylink_disconnect_phy() - disconnect any PHY attached to the phylink
  *   instance.
diff --git a/include/linux/phylink.h b/include/linux/phylink.h
index d81a714cfbbd..75d4f99090fd 100644
--- a/include/linux/phylink.h
+++ b/include/linux/phylink.h
@@ -439,6 +439,9 @@ void phylink_destroy(struct phylink *);
 
 int phylink_connect_phy(struct phylink *, struct phy_device *);
 int phylink_of_phy_connect(struct phylink *, struct device_node *, u32 flags);
+int phylink_fwnode_phy_connect(struct phylink *pl,
+			       struct fwnode_handle *fwnode,
+			       u32 flags);
 void phylink_disconnect_phy(struct phylink *);
 
 void phylink_mac_change(struct phylink *, bool up);
-- 
2.27.0


From d34f59033bb4e370047886e26463246cc9e64ec3 Mon Sep 17 00:00:00 2001
From: Calvin Johnson <calvin.johnson@oss.nxp.com>
Date: Thu, 11 Mar 2021 11:50:10 +0530
Subject: [PATCH 31/44] net: phylink: Refactor phylink_of_phy_connect()

Refactor phylink_of_phy_connect() to use phylink_fwnode_phy_connect().

Signed-off-by: Calvin Johnson <calvin.johnson@oss.nxp.com>
---
 drivers/net/phy/phylink.c | 39 +--------------------------------------
 1 file changed, 1 insertion(+), 38 deletions(-)

diff --git a/drivers/net/phy/phylink.c b/drivers/net/phy/phylink.c
index 479ffbf335a3..2aa31ff60d9b 100644
--- a/drivers/net/phy/phylink.c
+++ b/drivers/net/phy/phylink.c
@@ -1080,44 +1080,7 @@ EXPORT_SYMBOL_GPL(phylink_connect_phy);
 int phylink_of_phy_connect(struct phylink *pl, struct device_node *dn,
 			   u32 flags)
 {
-	struct device_node *phy_node;
-	struct phy_device *phy_dev;
-	int ret;
-
-	/* Fixed links and 802.3z are handled without needing a PHY */
-	if (pl->cfg_link_an_mode == MLO_AN_FIXED ||
-	    (pl->cfg_link_an_mode == MLO_AN_INBAND &&
-	     phy_interface_mode_is_8023z(pl->link_interface)))
-		return 0;
-
-	phy_node = of_parse_phandle(dn, "phy-handle", 0);
-	if (!phy_node)
-		phy_node = of_parse_phandle(dn, "phy", 0);
-	if (!phy_node)
-		phy_node = of_parse_phandle(dn, "phy-device", 0);
-
-	if (!phy_node) {
-		if (pl->cfg_link_an_mode == MLO_AN_PHY)
-			return -ENODEV;
-		return 0;
-	}
-
-	phy_dev = of_phy_find_device(phy_node);
-	/* We're done with the phy_node handle */
-	of_node_put(phy_node);
-	if (!phy_dev)
-		return -ENODEV;
-
-	ret = phy_attach_direct(pl->netdev, phy_dev, flags,
-				pl->link_interface);
-	if (ret)
-		return ret;
-
-	ret = phylink_bringup_phy(pl, phy_dev, pl->link_config.interface);
-	if (ret)
-		phy_detach(phy_dev);
-
-	return ret;
+	return phylink_fwnode_phy_connect(pl, of_fwnode_handle(dn), flags);
 }
 EXPORT_SYMBOL_GPL(phylink_of_phy_connect);
 
-- 
2.27.0


From 15b6e2fbb96d2be7517c229b2dba386ddb79ca72 Mon Sep 17 00:00:00 2001
From: Calvin Johnson <calvin.johnson@oss.nxp.com>
Date: Thu, 11 Mar 2021 11:50:11 +0530
Subject: [PATCH 32/44] net: dpaa2-mac: Add ACPI support for DPAA2 MAC driver

Modify dpaa2_mac_get_node() to get the dpmac fwnode from either
DT or ACPI.

Modify dpaa2_mac_get_if_mode() to get interface mode from dpmac_node
which is a fwnode.

Modify dpaa2_pcs_create() to create pcs from dpmac_node fwnode.

Modify dpaa2_mac_connect() to support ACPI along with DT.

Signed-off-by: Calvin Johnson <calvin.johnson@oss.nxp.com>
---
 .../net/ethernet/freescale/dpaa2/dpaa2-mac.c  | 84 +++++++++++--------
 1 file changed, 50 insertions(+), 34 deletions(-)

diff --git a/drivers/net/ethernet/freescale/dpaa2/dpaa2-mac.c b/drivers/net/ethernet/freescale/dpaa2/dpaa2-mac.c
index 50dd302abcf4..efd804d4a1bf 100644
--- a/drivers/net/ethernet/freescale/dpaa2/dpaa2-mac.c
+++ b/drivers/net/ethernet/freescale/dpaa2/dpaa2-mac.c
@@ -1,6 +1,9 @@
 // SPDX-License-Identifier: (GPL-2.0+ OR BSD-3-Clause)
 /* Copyright 2019 NXP */
 
+#include <linux/acpi.h>
+#include <linux/property.h>
+
 #include "dpaa2-eth.h"
 #include "dpaa2-mac.h"
 
@@ -34,39 +37,51 @@ static int phy_mode(enum dpmac_eth_if eth_if, phy_interface_t *if_mode)
 	return 0;
 }
 
-/* Caller must call of_node_put on the returned value */
-static struct device_node *dpaa2_mac_get_node(u16 dpmac_id)
+static struct fwnode_handle *dpaa2_mac_get_node(struct device *dev,
+						u16 dpmac_id)
 {
-	struct device_node *dpmacs, *dpmac = NULL;
-	u32 id;
+	struct fwnode_handle *fwnode, *parent, *child  = NULL;
+	struct device_node *dpmacs = NULL;
 	int err;
+	u32 id;
 
-	dpmacs = of_find_node_by_name(NULL, "dpmacs");
-	if (!dpmacs)
-		return NULL;
+	fwnode = dev_fwnode(dev->parent);
+	if (is_of_node(fwnode)) {
+		dpmacs = of_find_node_by_name(NULL, "dpmacs");
+		if (!dpmacs)
+			return NULL;
+		parent = of_fwnode_handle(dpmacs);
+	} else if (is_acpi_node(fwnode)) {
+		parent = fwnode;
+	}
 
-	while ((dpmac = of_get_next_child(dpmacs, dpmac)) != NULL) {
-		err = of_property_read_u32(dpmac, "reg", &id);
+	fwnode_for_each_child_node(parent, child) {
+		err = -EINVAL;
+		if (is_acpi_device_node(child))
+			err = acpi_get_local_address(ACPI_HANDLE_FWNODE(child), &id);
+		else if (is_of_node(child))
+			err = of_property_read_u32(to_of_node(child), "reg", &id);
 		if (err)
 			continue;
-		if (id == dpmac_id)
-			break;
-	}
 
+		if (id == dpmac_id) {
+			of_node_put(dpmacs);
+			return child;
+		}
+	}
 	of_node_put(dpmacs);
-
-	return dpmac;
+	return NULL;
 }
 
-static int dpaa2_mac_get_if_mode(struct device_node *node,
+static int dpaa2_mac_get_if_mode(struct fwnode_handle *dpmac_node,
 				 struct dpmac_attr attr)
 {
 	phy_interface_t if_mode;
 	int err;
 
-	err = of_get_phy_mode(node, &if_mode);
-	if (!err)
-		return if_mode;
+	err = fwnode_get_phy_mode(dpmac_node);
+	if (err > 0)
+		return err;
 
 	err = phy_mode(attr.eth_if, &if_mode);
 	if (!err)
@@ -255,26 +270,27 @@ bool dpaa2_mac_is_type_fixed(struct fsl_mc_device *dpmac_dev,
 }
 
 static int dpaa2_pcs_create(struct dpaa2_mac *mac,
-			    struct device_node *dpmac_node, int id)
+			    struct fwnode_handle *dpmac_node,
+			    int id)
 {
 	struct mdio_device *mdiodev;
-	struct device_node *node;
+	struct fwnode_handle *node;
 
-	node = of_parse_phandle(dpmac_node, "pcs-handle", 0);
-	if (!node) {
+	node = fwnode_find_reference(dpmac_node, "pcs-handle", 0);
+	if (IS_ERR(node)) {
 		/* do not error out on old DTS files */
 		netdev_warn(mac->net_dev, "pcs-handle node not found\n");
 		return 0;
 	}
 
-	if (!of_device_is_available(node)) {
+	if (!fwnode_device_is_available(node)) {
 		netdev_err(mac->net_dev, "pcs-handle node not available\n");
-		of_node_put(node);
+		fwnode_handle_put(node);
 		return -ENODEV;
 	}
 
-	mdiodev = of_mdio_find_device(node);
-	of_node_put(node);
+	mdiodev = fwnode_mdio_find_device(node);
+	fwnode_handle_put(node);
 	if (!mdiodev)
 		return -EPROBE_DEFER;
 
@@ -303,13 +319,13 @@ static void dpaa2_pcs_destroy(struct dpaa2_mac *mac)
 int dpaa2_mac_connect(struct dpaa2_mac *mac)
 {
 	struct net_device *net_dev = mac->net_dev;
-	struct device_node *dpmac_node;
+	struct fwnode_handle *dpmac_node = NULL;
 	struct phylink *phylink;
 	int err;
 
 	mac->if_link_type = mac->attr.link_type;
 
-	dpmac_node = dpaa2_mac_get_node(mac->attr.id);
+	dpmac_node = dpaa2_mac_get_node(&mac->mc_dev->dev, mac->attr.id);
 	if (!dpmac_node) {
 		netdev_err(net_dev, "No dpmac@%d node found.\n", mac->attr.id);
 		return -ENODEV;
@@ -326,7 +342,7 @@ int dpaa2_mac_connect(struct dpaa2_mac *mac)
 	 * error out if the interface mode requests them and there is no PHY
 	 * to act upon them
 	 */
-	if (of_phy_is_fixed_link(dpmac_node) &&
+	if (of_phy_is_fixed_link(to_of_node(dpmac_node)) &&
 	    (mac->if_mode == PHY_INTERFACE_MODE_RGMII_ID ||
 	     mac->if_mode == PHY_INTERFACE_MODE_RGMII_RXID ||
 	     mac->if_mode == PHY_INTERFACE_MODE_RGMII_TXID)) {
@@ -346,7 +362,7 @@ int dpaa2_mac_connect(struct dpaa2_mac *mac)
 	mac->phylink_config.type = PHYLINK_NETDEV;
 
 	phylink = phylink_create(&mac->phylink_config,
-				 of_fwnode_handle(dpmac_node), mac->if_mode,
+				 dpmac_node, mac->if_mode,
 				 &dpaa2_mac_phylink_ops);
 	if (IS_ERR(phylink)) {
 		err = PTR_ERR(phylink);
@@ -357,13 +373,13 @@ int dpaa2_mac_connect(struct dpaa2_mac *mac)
 	if (mac->pcs)
 		phylink_set_pcs(mac->phylink, &mac->pcs->pcs);
 
-	err = phylink_of_phy_connect(mac->phylink, dpmac_node, 0);
+	err = phylink_fwnode_phy_connect(mac->phylink, dpmac_node, 0);
 	if (err) {
-		netdev_err(net_dev, "phylink_of_phy_connect() = %d\n", err);
+		netdev_err(net_dev, "phylink_fwnode_phy_connect() = %d\n", err);
 		goto err_phylink_destroy;
 	}
 
-	of_node_put(dpmac_node);
+	fwnode_handle_put(dpmac_node);
 
 	return 0;
 
@@ -372,7 +388,7 @@ int dpaa2_mac_connect(struct dpaa2_mac *mac)
 err_pcs_destroy:
 	dpaa2_pcs_destroy(mac);
 err_put_node:
-	of_node_put(dpmac_node);
+	fwnode_handle_put(dpmac_node);
 
 	return err;
 }
-- 
2.27.0


From a523b29f4a96892a4747ed68b08194a6c8061508 Mon Sep 17 00:00:00 2001
From: Ioana Ciornei <ioana.ciornei@nxp.com>
Date: Thu, 14 Jan 2021 19:07:48 +0200
Subject: [PATCH 33/44] bus: fsl-mc: move fsl_mc_command struct in a uapi
 header

Define "struct fsl_mc_command" as a structure that can cross the
user/kernel boundary.

Signed-off-by: Ioana Ciornei <ioana.ciornei@nxp.com>
---
 MAINTAINERS                 |  1 +
 include/linux/fsl/mc.h      |  8 +-------
 include/uapi/linux/fsl_mc.h | 25 +++++++++++++++++++++++++
 3 files changed, 27 insertions(+), 7 deletions(-)
 create mode 100644 include/uapi/linux/fsl_mc.h

diff --git a/MAINTAINERS b/MAINTAINERS
index 79be0e518f45..e0a8bdb3567c 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -14425,6 +14425,7 @@ S:	Maintained
 F:	Documentation/devicetree/bindings/misc/fsl,qoriq-mc.txt
 F:	Documentation/networking/device_drivers/ethernet/freescale/dpaa2/overview.rst
 F:	drivers/bus/fsl-mc/
+F:	include/uapi/linux/fsl_mc.h
 
 QT1010 MEDIA DRIVER
 M:	Antti Palosaari <crope@iki.fi>
diff --git a/include/linux/fsl/mc.h b/include/linux/fsl/mc.h
index db244874e834..63b56aba925a 100644
--- a/include/linux/fsl/mc.h
+++ b/include/linux/fsl/mc.h
@@ -13,6 +13,7 @@
 #include <linux/device.h>
 #include <linux/mod_devicetable.h>
 #include <linux/interrupt.h>
+#include <uapi/linux/fsl_mc.h>
 
 #define FSL_MC_VENDOR_FREESCALE	0x1957
 
@@ -209,8 +210,6 @@ struct fsl_mc_device {
 #define to_fsl_mc_device(_dev) \
 	container_of(_dev, struct fsl_mc_device, dev)
 
-#define MC_CMD_NUM_OF_PARAMS	7
-
 struct mc_cmd_header {
 	u8 src_id;
 	u8 flags_hw;
@@ -220,11 +219,6 @@ struct mc_cmd_header {
 	__le16 cmd_id;
 };
 
-struct fsl_mc_command {
-	__le64 header;
-	__le64 params[MC_CMD_NUM_OF_PARAMS];
-};
-
 enum mc_cmd_status {
 	MC_CMD_STATUS_OK = 0x0, /* Completed successfully */
 	MC_CMD_STATUS_READY = 0x1, /* Ready to be processed */
diff --git a/include/uapi/linux/fsl_mc.h b/include/uapi/linux/fsl_mc.h
new file mode 100644
index 000000000000..cf56d46f052e
--- /dev/null
+++ b/include/uapi/linux/fsl_mc.h
@@ -0,0 +1,25 @@
+/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
+/*
+ * Management Complex (MC) userspace public interface
+ *
+ * Copyright 2021 NXP
+ *
+ */
+#ifndef _UAPI_FSL_MC_H_
+#define _UAPI_FSL_MC_H_
+
+#include <linux/types.h>
+
+#define MC_CMD_NUM_OF_PARAMS	7
+
+/**
+ * struct fsl_mc_command - Management Complex (MC) command structure
+ * @header: MC command header
+ * @params: MC command parameters
+ */
+struct fsl_mc_command {
+	__le64 header;
+	__le64 params[MC_CMD_NUM_OF_PARAMS];
+};
+
+#endif /* _UAPI_FSL_MC_H_ */
-- 
2.27.0


From a60453c68943570d705d78a1ffe0581154dca0c1 Mon Sep 17 00:00:00 2001
From: Ioana Ciornei <ioana.ciornei@nxp.com>
Date: Thu, 14 Jan 2021 19:07:49 +0200
Subject: [PATCH 34/44] bus: fsl-mc: export mc_cmd_hdr_read_cmdid() to the
 fsl-mc bus

Export the mc_cmd_hdr_read_cmdid() function to the entire fsl-mc bus
since it will be needed in the following patch.

Signed-off-by: Ioana Ciornei <ioana.ciornei@nxp.com>
---
 drivers/bus/fsl-mc/fsl-mc-private.h | 2 ++
 drivers/bus/fsl-mc/mc-sys.c         | 2 +-
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/bus/fsl-mc/fsl-mc-private.h b/drivers/bus/fsl-mc/fsl-mc-private.h
index c932387641fa..be686c363121 100644
--- a/drivers/bus/fsl-mc/fsl-mc-private.h
+++ b/drivers/bus/fsl-mc/fsl-mc-private.h
@@ -612,4 +612,6 @@ void fsl_mc_get_root_dprc(struct device *dev,
 struct fsl_mc_device *fsl_mc_device_lookup(struct fsl_mc_obj_desc *obj_desc,
 					   struct fsl_mc_device *mc_bus_dev);
 
+u16 mc_cmd_hdr_read_cmdid(struct fsl_mc_command *cmd);
+
 #endif /* _FSL_MC_PRIVATE_H_ */
diff --git a/drivers/bus/fsl-mc/mc-sys.c b/drivers/bus/fsl-mc/mc-sys.c
index 85a0225db522..b291b35e3884 100644
--- a/drivers/bus/fsl-mc/mc-sys.c
+++ b/drivers/bus/fsl-mc/mc-sys.c
@@ -35,7 +35,7 @@ static enum mc_cmd_status mc_cmd_hdr_read_status(struct fsl_mc_command *cmd)
 	return (enum mc_cmd_status)hdr->status;
 }
 
-static u16 mc_cmd_hdr_read_cmdid(struct fsl_mc_command *cmd)
+u16 mc_cmd_hdr_read_cmdid(struct fsl_mc_command *cmd)
 {
 	struct mc_cmd_header *hdr = (struct mc_cmd_header *)&cmd->header;
 	u16 cmd_id = le16_to_cpu(hdr->cmd_id);
-- 
2.27.0


From 4e2a5dcbaba4070b3920865836c2f597762a6b30 Mon Sep 17 00:00:00 2001
From: Ioana Ciornei <ioana.ciornei@nxp.com>
Date: Thu, 14 Jan 2021 19:07:50 +0200
Subject: [PATCH 35/44] bus: fsl-mc: add fsl-mc userspace support

Adding userspace support for the MC (Management Complex) means exporting
an ioctl capable device file representing the root resource container.

This new functionality in the fsl-mc bus driver intends to provide
userspace applications an interface to interact with the MC firmware.

Commands that are composed in userspace are sent to the MC firmware
through the FSL_MC_SEND_MC_COMMAND ioctl.  By default the implicit MC
I/O portal is used for this operation, but if the implicit one is busy,
a dynamic portal is allocated and then freed upon execution.

The command received through the ioctl interface is checked against a
known whitelist of accepted MC commands. Commands that attempt a change
in hardware configuration will need CAP_NET_ADMIN, while commands used
in debugging do not need it.

Signed-off-by: Ioana Ciornei <ioana.ciornei@nxp.com>
---
 .../userspace-api/ioctl/ioctl-number.rst      |   1 +
 drivers/bus/fsl-mc/Kconfig                    |   7 +
 drivers/bus/fsl-mc/Makefile                   |   3 +
 drivers/bus/fsl-mc/dprc-driver.c              |  12 +
 drivers/bus/fsl-mc/fsl-mc-private.h           |  39 ++
 drivers/bus/fsl-mc/fsl-mc-uapi.c              | 547 ++++++++++++++++++
 include/uapi/linux/fsl_mc.h                   |   9 +
 7 files changed, 618 insertions(+)
 create mode 100644 drivers/bus/fsl-mc/fsl-mc-uapi.c

diff --git a/Documentation/userspace-api/ioctl/ioctl-number.rst b/Documentation/userspace-api/ioctl/ioctl-number.rst
index 55a2d9b2ce33..3851e64b067b 100644
--- a/Documentation/userspace-api/ioctl/ioctl-number.rst
+++ b/Documentation/userspace-api/ioctl/ioctl-number.rst
@@ -180,6 +180,7 @@ Code  Seq#    Include File                                           Comments
 'R'   00-1F  linux/random.h                                          conflict!
 'R'   01     linux/rfkill.h                                          conflict!
 'R'   C0-DF  net/bluetooth/rfcomm.h
+'R'   E0     uapi/linux/fsl_mc.h
 'S'   all    linux/cdrom.h                                           conflict!
 'S'   80-81  scsi/scsi_ioctl.h                                       conflict!
 'S'   82-FF  scsi/scsi.h                                             conflict!
diff --git a/drivers/bus/fsl-mc/Kconfig b/drivers/bus/fsl-mc/Kconfig
index c23c77c9b705..b1fd55901c50 100644
--- a/drivers/bus/fsl-mc/Kconfig
+++ b/drivers/bus/fsl-mc/Kconfig
@@ -14,3 +14,10 @@ config FSL_MC_BUS
 	  architecture.  The fsl-mc bus driver handles discovery of
 	  DPAA2 objects (which are represented as Linux devices) and
 	  binding objects to drivers.
+
+config FSL_MC_UAPI_SUPPORT
+	bool "Management Complex (MC) userspace support"
+	depends on FSL_MC_BUS
+	help
+	  Provides userspace support for interrogating, creating, destroying or
+	  configuring DPAA2 objects exported by the Management Complex.
diff --git a/drivers/bus/fsl-mc/Makefile b/drivers/bus/fsl-mc/Makefile
index 3c518c7e8374..4ae292a30e53 100644
--- a/drivers/bus/fsl-mc/Makefile
+++ b/drivers/bus/fsl-mc/Makefile
@@ -16,3 +16,6 @@ mc-bus-driver-objs := fsl-mc-bus.o \
 		      fsl-mc-allocator.o \
 		      fsl-mc-msi.o \
 		      dpmcp.o
+
+# MC userspace support
+obj-$(CONFIG_FSL_MC_UAPI_SUPPORT) += fsl-mc-uapi.o
diff --git a/drivers/bus/fsl-mc/dprc-driver.c b/drivers/bus/fsl-mc/dprc-driver.c
index 91dc015963a8..ca2ce38a5d51 100644
--- a/drivers/bus/fsl-mc/dprc-driver.c
+++ b/drivers/bus/fsl-mc/dprc-driver.c
@@ -603,6 +603,7 @@ int dprc_setup(struct fsl_mc_device *mc_dev)
 	struct irq_domain *mc_msi_domain;
 	bool mc_io_created = false;
 	bool msi_domain_set = false;
+	bool uapi_created = false;
 	u16 major_ver, minor_ver;
 	size_t region_size;
 	int error;
@@ -635,6 +636,11 @@ int dprc_setup(struct fsl_mc_device *mc_dev)
 			return error;
 
 		mc_io_created = true;
+	} else {
+		error = fsl_mc_uapi_create_device_file(mc_bus);
+		if (error < 0)
+			return -EPROBE_DEFER;
+		uapi_created = true;
 	}
 
 	mc_msi_domain = fsl_mc_find_msi_domain(&mc_dev->dev);
@@ -694,6 +700,9 @@ int dprc_setup(struct fsl_mc_device *mc_dev)
 		mc_dev->mc_io = NULL;
 	}
 
+	if (uapi_created)
+		fsl_mc_uapi_remove_device_file(mc_bus);
+
 	return error;
 }
 EXPORT_SYMBOL_GPL(dprc_setup);
@@ -765,6 +774,7 @@ static void dprc_teardown_irq(struct fsl_mc_device *mc_dev)
 
 int dprc_cleanup(struct fsl_mc_device *mc_dev)
 {
+	struct fsl_mc_bus *mc_bus = to_fsl_mc_bus(mc_dev);
 	int error;
 
 	/* this function should be called only for DPRCs, it
@@ -795,6 +805,8 @@ int dprc_cleanup(struct fsl_mc_device *mc_dev)
 	if (!fsl_mc_is_root_dprc(&mc_dev->dev)) {
 		fsl_destroy_mc_io(mc_dev->mc_io);
 		mc_dev->mc_io = NULL;
+	} else {
+		fsl_mc_uapi_remove_device_file(mc_bus);
 	}
 
 	return 0;
diff --git a/drivers/bus/fsl-mc/fsl-mc-private.h b/drivers/bus/fsl-mc/fsl-mc-private.h
index be686c363121..6293a24de456 100644
--- a/drivers/bus/fsl-mc/fsl-mc-private.h
+++ b/drivers/bus/fsl-mc/fsl-mc-private.h
@@ -10,6 +10,8 @@
 
 #include <linux/fsl/mc.h>
 #include <linux/mutex.h>
+#include <linux/ioctl.h>
+#include <linux/miscdevice.h>
 
 /*
  * Data Path Management Complex (DPMNG) General API
@@ -542,6 +544,22 @@ struct fsl_mc_resource_pool {
 	struct fsl_mc_bus *mc_bus;
 };
 
+/**
+ * struct fsl_mc_uapi - information associated with a device file
+ * @misc: struct miscdevice linked to the root dprc
+ * @device: newly created device in /dev
+ * @mutex: mutex lock to serialize the open/release operations
+ * @local_instance_in_use: local MC I/O instance in use or not
+ * @static_mc_io: pointer to the static MC I/O object
+ */
+struct fsl_mc_uapi {
+	struct miscdevice misc;
+	struct device *device;
+	struct mutex mutex; /* serialize open/release operations */
+	u32 local_instance_in_use;
+	struct fsl_mc_io *static_mc_io;
+};
+
 /**
  * struct fsl_mc_bus - logical bus that corresponds to a physical DPRC
  * @mc_dev: fsl-mc device for the bus device itself.
@@ -551,6 +569,7 @@ struct fsl_mc_resource_pool {
  * @irq_resources: Pointer to array of IRQ objects for the IRQ pool
  * @scan_mutex: Serializes bus scanning
  * @dprc_attr: DPRC attributes
+ * @uapi_misc: struct that abstracts the interaction with userspace
  */
 struct fsl_mc_bus {
 	struct fsl_mc_device mc_dev;
@@ -558,6 +577,7 @@ struct fsl_mc_bus {
 	struct fsl_mc_device_irq *irq_resources;
 	struct mutex scan_mutex;    /* serializes bus scanning */
 	struct dprc_attributes dprc_attr;
+	struct fsl_mc_uapi uapi_misc;
 };
 
 #define to_fsl_mc_bus(_mc_dev) \
@@ -614,4 +634,23 @@ struct fsl_mc_device *fsl_mc_device_lookup(struct fsl_mc_obj_desc *obj_desc,
 
 u16 mc_cmd_hdr_read_cmdid(struct fsl_mc_command *cmd);
 
+#ifdef CONFIG_FSL_MC_UAPI_SUPPORT
+
+int fsl_mc_uapi_create_device_file(struct fsl_mc_bus *mc_bus);
+
+void fsl_mc_uapi_remove_device_file(struct fsl_mc_bus *mc_bus);
+
+#else
+
+static inline int fsl_mc_uapi_create_device_file(struct fsl_mc_bus *mc_bus)
+{
+	return 0;
+}
+
+static inline void fsl_mc_uapi_remove_device_file(struct fsl_mc_bus *mc_bus)
+{
+}
+
+#endif
+
 #endif /* _FSL_MC_PRIVATE_H_ */
diff --git a/drivers/bus/fsl-mc/fsl-mc-uapi.c b/drivers/bus/fsl-mc/fsl-mc-uapi.c
new file mode 100644
index 000000000000..eeb988c9f4bb
--- /dev/null
+++ b/drivers/bus/fsl-mc/fsl-mc-uapi.c
@@ -0,0 +1,547 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Management Complex (MC) userspace support
+ *
+ * Copyright 2021 NXP
+ *
+ */
+
+#include <linux/slab.h>
+#include <linux/fs.h>
+#include <linux/uaccess.h>
+#include <linux/miscdevice.h>
+
+#include "fsl-mc-private.h"
+
+struct uapi_priv_data {
+	struct fsl_mc_uapi *uapi;
+	struct fsl_mc_io *mc_io;
+};
+
+struct fsl_mc_cmd_desc {
+	u16 cmdid_value;
+	u16 cmdid_mask;
+	int size;
+	bool token;
+	int flags;
+};
+
+#define FSL_MC_CHECK_MODULE_ID		BIT(0)
+#define FSL_MC_CAP_NET_ADMIN_NEEDED	BIT(1)
+
+enum fsl_mc_cmd_index {
+	DPDBG_DUMP = 0,
+	DPDBG_SET,
+	DPRC_GET_CONTAINER_ID,
+	DPRC_CREATE_CONT,
+	DPRC_DESTROY_CONT,
+	DPRC_ASSIGN,
+	DPRC_UNASSIGN,
+	DPRC_GET_OBJ_COUNT,
+	DPRC_GET_OBJ,
+	DPRC_GET_RES_COUNT,
+	DPRC_GET_RES_IDS,
+	DPRC_SET_OBJ_LABEL,
+	DPRC_SET_LOCKED,
+	DPRC_CONNECT,
+	DPRC_DISCONNECT,
+	DPRC_GET_POOL,
+	DPRC_GET_POOL_COUNT,
+	DPRC_GET_CONNECTION,
+	DPCI_GET_LINK_STATE,
+	DPCI_GET_PEER_ATTR,
+	DPAIOP_GET_SL_VERSION,
+	DPAIOP_GET_STATE,
+	DPMNG_GET_VERSION,
+	DPSECI_GET_TX_QUEUE,
+	DPMAC_GET_COUNTER,
+	DPMAC_GET_MAC_ADDR,
+	DPNI_SET_PRIM_MAC,
+	DPNI_GET_PRIM_MAC,
+	DPNI_GET_STATISTICS,
+	DPNI_GET_LINK_STATE,
+	GET_ATTR,
+	GET_IRQ_MASK,
+	GET_IRQ_STATUS,
+	CLOSE,
+	OPEN,
+	GET_API_VERSION,
+	DESTROY,
+	CREATE,
+};
+
+static struct fsl_mc_cmd_desc fsl_mc_accepted_cmds[] = {
+	[DPDBG_DUMP] = {
+		.cmdid_value = 0x1300,
+		.cmdid_mask = 0xFFF0,
+		.token = true,
+		.size = 28,
+	},
+	[DPDBG_SET] = {
+		.cmdid_value = 0x1400,
+		.cmdid_mask = 0xFFF0,
+		.token = true,
+		.size = 28,
+	},
+	[DPRC_GET_CONTAINER_ID] = {
+		.cmdid_value = 0x8300,
+		.cmdid_mask = 0xFFF0,
+		.token = false,
+		.size = 8,
+	},
+	[DPRC_CREATE_CONT] = {
+		.cmdid_value = 0x1510,
+		.cmdid_mask = 0xFFF0,
+		.token = true,
+		.size = 40,
+		.flags = FSL_MC_CAP_NET_ADMIN_NEEDED,
+	},
+	[DPRC_DESTROY_CONT] = {
+		.cmdid_value = 0x1520,
+		.cmdid_mask = 0xFFF0,
+		.token = true,
+		.size = 12,
+		.flags = FSL_MC_CAP_NET_ADMIN_NEEDED,
+	},
+	[DPRC_ASSIGN] = {
+		.cmdid_value = 0x1570,
+		.cmdid_mask = 0xFFF0,
+		.token = true,
+		.size = 40,
+		.flags = FSL_MC_CAP_NET_ADMIN_NEEDED,
+	},
+	[DPRC_UNASSIGN] = {
+		.cmdid_value = 0x1580,
+		.cmdid_mask = 0xFFF0,
+		.token = true,
+		.size = 40,
+		.flags = FSL_MC_CAP_NET_ADMIN_NEEDED,
+	},
+	[DPRC_GET_OBJ_COUNT] = {
+		.cmdid_value = 0x1590,
+		.cmdid_mask = 0xFFF0,
+		.token = true,
+		.size = 16,
+	},
+	[DPRC_GET_OBJ] = {
+		.cmdid_value = 0x15A0,
+		.cmdid_mask = 0xFFF0,
+		.token = true,
+		.size = 12,
+	},
+	[DPRC_GET_RES_COUNT] = {
+		.cmdid_value = 0x15B0,
+		.cmdid_mask = 0xFFF0,
+		.token = true,
+		.size = 32,
+	},
+	[DPRC_GET_RES_IDS] = {
+		.cmdid_value = 0x15C0,
+		.cmdid_mask = 0xFFF0,
+		.token = true,
+		.size = 40,
+	},
+	[DPRC_SET_OBJ_LABEL] = {
+		.cmdid_value = 0x1610,
+		.cmdid_mask = 0xFFF0,
+		.token = true,
+		.size = 48,
+		.flags = FSL_MC_CAP_NET_ADMIN_NEEDED,
+	},
+	[DPRC_SET_LOCKED] = {
+		.cmdid_value = 0x16B0,
+		.cmdid_mask = 0xFFF0,
+		.token = true,
+		.size = 16,
+		.flags = FSL_MC_CAP_NET_ADMIN_NEEDED,
+	},
+	[DPRC_CONNECT] = {
+		.cmdid_value = 0x1670,
+		.cmdid_mask = 0xFFF0,
+		.token = true,
+		.size = 56,
+		.flags = FSL_MC_CAP_NET_ADMIN_NEEDED,
+	},
+	[DPRC_DISCONNECT] = {
+		.cmdid_value = 0x1680,
+		.cmdid_mask = 0xFFF0,
+		.token = true,
+		.size = 32,
+		.flags = FSL_MC_CAP_NET_ADMIN_NEEDED,
+	},
+	[DPRC_GET_POOL] = {
+		.cmdid_value = 0x1690,
+		.cmdid_mask = 0xFFF0,
+		.token = true,
+		.size = 12,
+	},
+	[DPRC_GET_POOL_COUNT] = {
+		.cmdid_value = 0x16A0,
+		.cmdid_mask = 0xFFF0,
+		.token = true,
+		.size = 8,
+	},
+	[DPRC_GET_CONNECTION] = {
+		.cmdid_value = 0x16C0,
+		.cmdid_mask = 0xFFF0,
+		.token = true,
+		.size = 32,
+	},
+
+	[DPCI_GET_LINK_STATE] = {
+		.cmdid_value = 0x0E10,
+		.cmdid_mask = 0xFFF0,
+		.token = true,
+		.size = 8,
+	},
+	[DPCI_GET_PEER_ATTR] = {
+		.cmdid_value = 0x0E20,
+		.cmdid_mask = 0xFFF0,
+		.token = true,
+		.size = 8,
+	},
+	[DPAIOP_GET_SL_VERSION] = {
+		.cmdid_value = 0x2820,
+		.cmdid_mask = 0xFFF0,
+		.token = true,
+		.size = 8,
+	},
+	[DPAIOP_GET_STATE] = {
+		.cmdid_value = 0x2830,
+		.cmdid_mask = 0xFFF0,
+		.token = true,
+		.size = 8,
+	},
+	[DPMNG_GET_VERSION] = {
+		.cmdid_value = 0x8310,
+		.cmdid_mask = 0xFFF0,
+		.token = false,
+		.size = 8,
+	},
+	[DPSECI_GET_TX_QUEUE] = {
+		.cmdid_value = 0x1970,
+		.cmdid_mask = 0xFFF0,
+		.token = true,
+		.size = 14,
+	},
+	[DPMAC_GET_COUNTER] = {
+		.cmdid_value = 0x0c40,
+		.cmdid_mask = 0xFFF0,
+		.token = true,
+		.size = 9,
+	},
+	[DPMAC_GET_MAC_ADDR] = {
+		.cmdid_value = 0x0c50,
+		.cmdid_mask = 0xFFF0,
+		.token = true,
+		.size = 8,
+	},
+	[DPNI_SET_PRIM_MAC] = {
+		.cmdid_value = 0x2240,
+		.cmdid_mask = 0xFFF0,
+		.token = true,
+		.size = 16,
+		.flags = FSL_MC_CAP_NET_ADMIN_NEEDED,
+	},
+	[DPNI_GET_PRIM_MAC] = {
+		.cmdid_value = 0x2250,
+		.cmdid_mask = 0xFFF0,
+		.token = true,
+		.size = 8,
+	},
+	[DPNI_GET_STATISTICS] = {
+		.cmdid_value = 0x25D0,
+		.cmdid_mask = 0xFFF0,
+		.token = true,
+		.size = 10,
+	},
+	[DPNI_GET_LINK_STATE] = {
+		.cmdid_value = 0x2150,
+		.cmdid_mask = 0xFFF0,
+		.token = true,
+		.size = 8,
+	},
+	[GET_ATTR] = {
+		.cmdid_value = 0x0040,
+		.cmdid_mask = 0xFFF0,
+		.token = true,
+		.size = 8,
+	},
+	[GET_IRQ_MASK] = {
+		.cmdid_value = 0x0150,
+		.cmdid_mask = 0xFFF0,
+		.token = true,
+		.size = 13,
+	},
+	[GET_IRQ_STATUS] = {
+		.cmdid_value = 0x0160,
+		.cmdid_mask = 0xFFF0,
+		.token = true,
+		.size = 13,
+	},
+	[CLOSE] = {
+		.cmdid_value = 0x8000,
+		.cmdid_mask = 0xFFF0,
+		.token = true,
+		.size = 8,
+	},
+
+	/* Common commands amongst all types of objects. Must be checked last. */
+	[OPEN] = {
+		.cmdid_value = 0x8000,
+		.cmdid_mask = 0xFC00,
+		.token = false,
+		.size = 12,
+		.flags = FSL_MC_CHECK_MODULE_ID,
+	},
+	[GET_API_VERSION] = {
+		.cmdid_value = 0xA000,
+		.cmdid_mask = 0xFC00,
+		.token = false,
+		.size = 8,
+		.flags = FSL_MC_CHECK_MODULE_ID,
+	},
+	[DESTROY] = {
+		.cmdid_value = 0x9800,
+		.cmdid_mask = 0xFC00,
+		.token = true,
+		.size = 12,
+		.flags = FSL_MC_CHECK_MODULE_ID | FSL_MC_CAP_NET_ADMIN_NEEDED,
+	},
+	[CREATE] = {
+		.cmdid_value = 0x9000,
+		.cmdid_mask = 0xFC00,
+		.token = true,
+		.size = 64,
+		.flags = FSL_MC_CHECK_MODULE_ID | FSL_MC_CAP_NET_ADMIN_NEEDED,
+	},
+};
+
+#define FSL_MC_NUM_ACCEPTED_CMDS ARRAY_SIZE(fsl_mc_accepted_cmds)
+
+#define FSL_MC_MAX_MODULE_ID 0x10
+
+static int fsl_mc_command_check(struct fsl_mc_device *mc_dev,
+				struct fsl_mc_command *mc_cmd)
+{
+	struct fsl_mc_cmd_desc *desc = NULL;
+	int mc_cmd_max_size, i;
+	bool token_provided;
+	u16 cmdid, module_id;
+	char *mc_cmd_end;
+	char sum = 0;
+
+	/* Check if this is an accepted MC command */
+	cmdid = mc_cmd_hdr_read_cmdid(mc_cmd);
+	for (i = 0; i < FSL_MC_NUM_ACCEPTED_CMDS; i++) {
+		desc = &fsl_mc_accepted_cmds[i];
+		if ((cmdid & desc->cmdid_mask) == desc->cmdid_value)
+			break;
+	}
+	if (!desc) {
+		dev_err(&mc_dev->dev, "MC command 0x%04x: cmdid not accepted\n", cmdid);
+		return -EACCES;
+	}
+
+	/* Check if the size of the command is honored. Anything beyond the
+	 * last valid byte of the command should be zeroed.
+	 */
+	mc_cmd_max_size = sizeof(*mc_cmd);
+	mc_cmd_end = ((char *)mc_cmd) + desc->size;
+	for (i = desc->size; i < mc_cmd_max_size; i++)
+		sum |= *mc_cmd_end++;
+	if (sum) {
+		dev_err(&mc_dev->dev, "MC command 0x%04x: garbage beyond max size of %d bytes!\n",
+			cmdid, desc->size);
+		return -EACCES;
+	}
+
+	/* Some MC commands request a token to be passed so that object
+	 * identification is possible. Check if the token passed in the command
+	 * is as expected.
+	 */
+	token_provided = mc_cmd_hdr_read_token(mc_cmd) ? true : false;
+	if (token_provided != desc->token) {
+		dev_err(&mc_dev->dev, "MC command 0x%04x: token 0x%04x is invalid!\n",
+			cmdid, mc_cmd_hdr_read_token(mc_cmd));
+		return -EACCES;
+	}
+
+	/* If needed, check if the module ID passed is valid */
+	if (desc->flags & FSL_MC_CHECK_MODULE_ID) {
+		/* The module ID is represented by bits [4:9] from the cmdid */
+		module_id = (cmdid & GENMASK(9, 4)) >> 4;
+		if (module_id == 0 || module_id > FSL_MC_MAX_MODULE_ID) {
+			dev_err(&mc_dev->dev, "MC command 0x%04x: unknown module ID 0x%x\n",
+				cmdid, module_id);
+			return -EACCES;
+		}
+	}
+
+	/* Some commands alter how hardware resources are managed. For these
+	 * commands, check for CAP_NET_ADMIN.
+	 */
+	if (desc->flags & FSL_MC_CAP_NET_ADMIN_NEEDED) {
+		if (!capable(CAP_NET_ADMIN)) {
+			dev_err(&mc_dev->dev, "MC command 0x%04x: needs CAP_NET_ADMIN!\n",
+				cmdid);
+			return -EPERM;
+		}
+	}
+
+	return 0;
+}
+
+static int fsl_mc_uapi_send_command(struct fsl_mc_device *mc_dev, unsigned long arg,
+				    struct fsl_mc_io *mc_io)
+{
+	struct fsl_mc_command mc_cmd;
+	int error;
+
+	error = copy_from_user(&mc_cmd, (void __user *)arg, sizeof(mc_cmd));
+	if (error)
+		return -EFAULT;
+
+	error = fsl_mc_command_check(mc_dev, &mc_cmd);
+	if (error)
+		return error;
+
+	error = mc_send_command(mc_io, &mc_cmd);
+	if (error)
+		return error;
+
+	error = copy_to_user((void __user *)arg, &mc_cmd, sizeof(mc_cmd));
+	if (error)
+		return -EFAULT;
+
+	return 0;
+}
+
+static int fsl_mc_uapi_dev_open(struct inode *inode, struct file *filep)
+{
+	struct fsl_mc_device *root_mc_device;
+	struct uapi_priv_data *priv_data;
+	struct fsl_mc_io *dynamic_mc_io;
+	struct fsl_mc_uapi *mc_uapi;
+	struct fsl_mc_bus *mc_bus;
+	int error;
+
+	priv_data = kzalloc(sizeof(*priv_data), GFP_KERNEL);
+	if (!priv_data)
+		return -ENOMEM;
+
+	mc_uapi = container_of(filep->private_data, struct fsl_mc_uapi, misc);
+	mc_bus = container_of(mc_uapi, struct fsl_mc_bus, uapi_misc);
+	root_mc_device = &mc_bus->mc_dev;
+
+	mutex_lock(&mc_uapi->mutex);
+
+	if (!mc_uapi->local_instance_in_use) {
+		priv_data->mc_io = mc_uapi->static_mc_io;
+		mc_uapi->local_instance_in_use = 1;
+	} else {
+		error = fsl_mc_portal_allocate(root_mc_device, 0,
+					       &dynamic_mc_io);
+		if (error) {
+			dev_dbg(&root_mc_device->dev,
+				"Could not allocate MC portal\n");
+			goto error_portal_allocate;
+		}
+
+		priv_data->mc_io = dynamic_mc_io;
+	}
+	priv_data->uapi = mc_uapi;
+	filep->private_data = priv_data;
+
+	mutex_unlock(&mc_uapi->mutex);
+
+	return 0;
+
+error_portal_allocate:
+	mutex_unlock(&mc_uapi->mutex);
+	kfree(priv_data);
+
+	return error;
+}
+
+static int fsl_mc_uapi_dev_release(struct inode *inode, struct file *filep)
+{
+	struct uapi_priv_data *priv_data;
+	struct fsl_mc_uapi *mc_uapi;
+	struct fsl_mc_io *mc_io;
+
+	priv_data = filep->private_data;
+	mc_uapi = priv_data->uapi;
+	mc_io = priv_data->mc_io;
+
+	mutex_lock(&mc_uapi->mutex);
+
+	if (mc_io == mc_uapi->static_mc_io)
+		mc_uapi->local_instance_in_use = 0;
+	else
+		fsl_mc_portal_free(mc_io);
+
+	kfree(filep->private_data);
+	filep->private_data =  NULL;
+
+	mutex_unlock(&mc_uapi->mutex);
+
+	return 0;
+}
+
+static long fsl_mc_uapi_dev_ioctl(struct file *file,
+				  unsigned int cmd,
+				  unsigned long arg)
+{
+	struct uapi_priv_data *priv_data = file->private_data;
+	struct fsl_mc_device *root_mc_device;
+	struct fsl_mc_bus *mc_bus;
+	int error;
+
+	mc_bus = container_of(priv_data->uapi, struct fsl_mc_bus, uapi_misc);
+	root_mc_device = &mc_bus->mc_dev;
+
+	switch (cmd) {
+	case FSL_MC_SEND_MC_COMMAND:
+		error = fsl_mc_uapi_send_command(root_mc_device, arg, priv_data->mc_io);
+		break;
+	default:
+		dev_dbg(&root_mc_device->dev, "unexpected ioctl call number\n");
+		error = -EINVAL;
+	}
+
+	return error;
+}
+
+static const struct file_operations fsl_mc_uapi_dev_fops = {
+	.owner = THIS_MODULE,
+	.open = fsl_mc_uapi_dev_open,
+	.release = fsl_mc_uapi_dev_release,
+	.unlocked_ioctl = fsl_mc_uapi_dev_ioctl,
+};
+
+int fsl_mc_uapi_create_device_file(struct fsl_mc_bus *mc_bus)
+{
+	struct fsl_mc_device *mc_dev = &mc_bus->mc_dev;
+	struct fsl_mc_uapi *mc_uapi = &mc_bus->uapi_misc;
+	int error;
+
+	mc_uapi->misc.minor = MISC_DYNAMIC_MINOR;
+	mc_uapi->misc.name = dev_name(&mc_dev->dev);
+	mc_uapi->misc.fops = &fsl_mc_uapi_dev_fops;
+
+	error = misc_register(&mc_uapi->misc);
+	if (error)
+		return error;
+
+	mc_uapi->static_mc_io = mc_bus->mc_dev.mc_io;
+
+	mutex_init(&mc_uapi->mutex);
+
+	return 0;
+}
+
+void fsl_mc_uapi_remove_device_file(struct fsl_mc_bus *mc_bus)
+{
+	misc_deregister(&mc_bus->uapi_misc.misc);
+}
diff --git a/include/uapi/linux/fsl_mc.h b/include/uapi/linux/fsl_mc.h
index cf56d46f052e..e57451570033 100644
--- a/include/uapi/linux/fsl_mc.h
+++ b/include/uapi/linux/fsl_mc.h
@@ -16,10 +16,19 @@
  * struct fsl_mc_command - Management Complex (MC) command structure
  * @header: MC command header
  * @params: MC command parameters
+ *
+ * Used by FSL_MC_SEND_MC_COMMAND
  */
 struct fsl_mc_command {
 	__le64 header;
 	__le64 params[MC_CMD_NUM_OF_PARAMS];
 };
 
+#define FSL_MC_SEND_CMD_IOCTL_TYPE	'R'
+#define FSL_MC_SEND_CMD_IOCTL_SEQ	0xE0
+
+#define FSL_MC_SEND_MC_COMMAND \
+	_IOWR(FSL_MC_SEND_CMD_IOCTL_TYPE, FSL_MC_SEND_CMD_IOCTL_SEQ, \
+	struct fsl_mc_command)
+
 #endif /* _UAPI_FSL_MC_H_ */
-- 
2.27.0


From e4c686ebcbba8431f97eb044e3b6c70dda36bd91 Mon Sep 17 00:00:00 2001
From: Ioana Ciornei <ioana.ciornei@nxp.com>
Date: Thu, 14 Jan 2021 19:07:51 +0200
Subject: [PATCH 36/44] bus: fsl-mc: add bus rescan attribute

Introduce the rescan attribute as a bus attribute to
synchronize the fsl-mc bus objects and the MC firmware.

To rescan the fsl-mc bus, e.g.,
echo 1 > /sys/bus/fsl-mc/rescan

Signed-off-by: Ioana Ciornei <ioana.ciornei@nxp.com>
---
 Documentation/ABI/stable/sysfs-bus-fsl-mc |  9 +++++
 MAINTAINERS                               |  1 +
 drivers/bus/fsl-mc/dprc-driver.c          |  4 +--
 drivers/bus/fsl-mc/fsl-mc-bus.c           | 41 +++++++++++++++++++++++
 drivers/bus/fsl-mc/fsl-mc-private.h       |  3 ++
 5 files changed, 56 insertions(+), 2 deletions(-)
 create mode 100644 Documentation/ABI/stable/sysfs-bus-fsl-mc

diff --git a/Documentation/ABI/stable/sysfs-bus-fsl-mc b/Documentation/ABI/stable/sysfs-bus-fsl-mc
new file mode 100644
index 000000000000..a4d384df9ba8
--- /dev/null
+++ b/Documentation/ABI/stable/sysfs-bus-fsl-mc
@@ -0,0 +1,9 @@
+What:		/sys/bus/fsl-mc/rescan
+Date:		January 2021
+KernelVersion:	5.12
+Contact:	Ioana Ciornei <ioana.ciornei@nxp.com>
+Description:	Writing a non-zero value to this attribute will
+		force a rescan of fsl-mc bus in the system and
+		synchronize the objects under fsl-mc bus and the
+		Management Complex firmware.
+Users:		Userspace drivers and management tools
diff --git a/MAINTAINERS b/MAINTAINERS
index e0a8bdb3567c..590779774dd2 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -14422,6 +14422,7 @@ M:	Stuart Yoder <stuyoder@gmail.com>
 M:	Laurentiu Tudor <laurentiu.tudor@nxp.com>
 L:	linux-kernel@vger.kernel.org
 S:	Maintained
+F:	Documentation/ABI/stable/sysfs-bus-fsl-mc
 F:	Documentation/devicetree/bindings/misc/fsl,qoriq-mc.txt
 F:	Documentation/networking/device_drivers/ethernet/freescale/dpaa2/overview.rst
 F:	drivers/bus/fsl-mc/
diff --git a/drivers/bus/fsl-mc/dprc-driver.c b/drivers/bus/fsl-mc/dprc-driver.c
index ca2ce38a5d51..57a59f7f9802 100644
--- a/drivers/bus/fsl-mc/dprc-driver.c
+++ b/drivers/bus/fsl-mc/dprc-driver.c
@@ -237,8 +237,8 @@ static void dprc_add_new_devices(struct fsl_mc_device *mc_bus_dev,
  * populated before they can get allocation requests from probe callbacks
  * of the device drivers for the non-allocatable devices.
  */
-static int dprc_scan_objects(struct fsl_mc_device *mc_bus_dev,
-			    bool alloc_interrupts)
+int dprc_scan_objects(struct fsl_mc_device *mc_bus_dev,
+		      bool alloc_interrupts)
 {
 	int num_child_objects;
 	int dprc_get_obj_failures;
diff --git a/drivers/bus/fsl-mc/fsl-mc-bus.c b/drivers/bus/fsl-mc/fsl-mc-bus.c
index b8e6acdf932e..cb031287b190 100644
--- a/drivers/bus/fsl-mc/fsl-mc-bus.c
+++ b/drivers/bus/fsl-mc/fsl-mc-bus.c
@@ -208,12 +208,53 @@ static struct attribute *fsl_mc_dev_attrs[] = {
 
 ATTRIBUTE_GROUPS(fsl_mc_dev);
 
+static int scan_fsl_mc_bus(struct device *dev, void *data)
+{
+	struct fsl_mc_device *root_mc_dev;
+	struct fsl_mc_bus *root_mc_bus;
+
+	if (!fsl_mc_is_root_dprc(dev))
+		goto exit;
+
+	root_mc_dev = to_fsl_mc_device(dev);
+	root_mc_bus = to_fsl_mc_bus(root_mc_dev);
+	mutex_lock(&root_mc_bus->scan_mutex);
+	dprc_scan_objects(root_mc_dev, NULL);
+	mutex_unlock(&root_mc_bus->scan_mutex);
+
+exit:
+	return 0;
+}
+
+static ssize_t rescan_store(struct bus_type *bus,
+			    const char *buf, size_t count)
+{
+	unsigned long val;
+
+	if (kstrtoul(buf, 0, &val) < 0)
+		return -EINVAL;
+
+	if (val)
+		bus_for_each_dev(bus, NULL, NULL, scan_fsl_mc_bus);
+
+	return count;
+}
+static BUS_ATTR_WO(rescan);
+
+static struct attribute *fsl_mc_bus_attrs[] = {
+	&bus_attr_rescan.attr,
+	NULL,
+};
+
+ATTRIBUTE_GROUPS(fsl_mc_bus);
+
 struct bus_type fsl_mc_bus_type = {
 	.name = "fsl-mc",
 	.match = fsl_mc_bus_match,
 	.uevent = fsl_mc_bus_uevent,
 	.dma_configure  = fsl_mc_dma_configure,
 	.dev_groups = fsl_mc_dev_groups,
+	.bus_groups = fsl_mc_bus_groups,
 };
 EXPORT_SYMBOL_GPL(fsl_mc_bus_type);
 
diff --git a/drivers/bus/fsl-mc/fsl-mc-private.h b/drivers/bus/fsl-mc/fsl-mc-private.h
index 6293a24de456..42bdb8679a36 100644
--- a/drivers/bus/fsl-mc/fsl-mc-private.h
+++ b/drivers/bus/fsl-mc/fsl-mc-private.h
@@ -594,6 +594,9 @@ int __init dprc_driver_init(void);
 
 void dprc_driver_exit(void);
 
+int dprc_scan_objects(struct fsl_mc_device *mc_bus_dev,
+		      bool alloc_interrupts);
+
 int __init fsl_mc_allocator_driver_init(void);
 
 void fsl_mc_allocator_driver_exit(void);
-- 
2.27.0


From 7c1ac9e45f0b634e0cde8106c49b21fb65961b60 Mon Sep 17 00:00:00 2001
From: Ioana Ciornei <ioana.ciornei@nxp.com>
Date: Thu, 14 Jan 2021 19:07:52 +0200
Subject: [PATCH 37/44] bus: fsl-mc: add autorescan sysfs

Add the autorescan sysfs in order to enable/disable the DPRC IRQs on
which automatic rescan of the bus is performed. This is important when
dynamic creation of objects is needed to happen in a timely manner because
object creation can be bundled together.

Signed-off-by: Ioana Ciornei <ioana.ciornei@nxp.com>
---
 Documentation/ABI/stable/sysfs-bus-fsl-mc | 10 +++++
 drivers/bus/fsl-mc/dprc-driver.c          | 17 ++++++-
 drivers/bus/fsl-mc/fsl-mc-bus.c           | 55 +++++++++++++++++++++++
 drivers/bus/fsl-mc/fsl-mc-private.h       |  5 +++
 4 files changed, 85 insertions(+), 2 deletions(-)

diff --git a/Documentation/ABI/stable/sysfs-bus-fsl-mc b/Documentation/ABI/stable/sysfs-bus-fsl-mc
index a4d384df9ba8..58f06c7eeed7 100644
--- a/Documentation/ABI/stable/sysfs-bus-fsl-mc
+++ b/Documentation/ABI/stable/sysfs-bus-fsl-mc
@@ -7,3 +7,13 @@ Description:	Writing a non-zero value to this attribute will
 		synchronize the objects under fsl-mc bus and the
 		Management Complex firmware.
 Users:		Userspace drivers and management tools
+
+What:		/sys/bus/fsl-mc/autorescan
+Date:		January 2021
+KernelVersion:	5.12
+Contact:	Ioana Ciornei <ioana.ciornei@nxp.com>
+Description:	Writing a zero value to this attribute will
+		disable the DPRC IRQs on which automatic rescan
+		of the fsl-mc bus is performed. A non-zero value
+		will enable the DPRC IRQs.
+Users:		Userspace drivers and management tools
diff --git a/drivers/bus/fsl-mc/dprc-driver.c b/drivers/bus/fsl-mc/dprc-driver.c
index 57a59f7f9802..df71c16f8a73 100644
--- a/drivers/bus/fsl-mc/dprc-driver.c
+++ b/drivers/bus/fsl-mc/dprc-driver.c
@@ -458,8 +458,9 @@ static irqreturn_t dprc_irq0_handler_thread(int irq_num, void *arg)
 /*
  * Disable and clear interrupt for a given DPRC object
  */
-static int disable_dprc_irq(struct fsl_mc_device *mc_dev)
+int disable_dprc_irq(struct fsl_mc_device *mc_dev)
 {
+	struct fsl_mc_bus *mc_bus = to_fsl_mc_bus(mc_dev);
 	int error;
 	struct fsl_mc_io *mc_io = mc_dev->mc_io;
 
@@ -496,9 +497,18 @@ static int disable_dprc_irq(struct fsl_mc_device *mc_dev)
 		return error;
 	}
 
+	mc_bus->irq_enabled = 0;
+
 	return 0;
 }
 
+int get_dprc_irq_state(struct fsl_mc_device *mc_dev)
+{
+	struct fsl_mc_bus *mc_bus = to_fsl_mc_bus(mc_dev);
+
+	return mc_bus->irq_enabled;
+}
+
 static int register_dprc_irq_handler(struct fsl_mc_device *mc_dev)
 {
 	int error;
@@ -525,8 +535,9 @@ static int register_dprc_irq_handler(struct fsl_mc_device *mc_dev)
 	return 0;
 }
 
-static int enable_dprc_irq(struct fsl_mc_device *mc_dev)
+int enable_dprc_irq(struct fsl_mc_device *mc_dev)
 {
+	struct fsl_mc_bus *mc_bus = to_fsl_mc_bus(mc_dev);
 	int error;
 
 	/*
@@ -554,6 +565,8 @@ static int enable_dprc_irq(struct fsl_mc_device *mc_dev)
 		return error;
 	}
 
+	mc_bus->irq_enabled = 1;
+
 	return 0;
 }
 
diff --git a/drivers/bus/fsl-mc/fsl-mc-bus.c b/drivers/bus/fsl-mc/fsl-mc-bus.c
index cb031287b190..34811db074b7 100644
--- a/drivers/bus/fsl-mc/fsl-mc-bus.c
+++ b/drivers/bus/fsl-mc/fsl-mc-bus.c
@@ -241,8 +241,63 @@ static ssize_t rescan_store(struct bus_type *bus,
 }
 static BUS_ATTR_WO(rescan);
 
+static int fsl_mc_bus_set_autorescan(struct device *dev, void *data)
+{
+	struct fsl_mc_device *root_mc_dev;
+	unsigned long val;
+	char *buf = data;
+
+	if (!fsl_mc_is_root_dprc(dev))
+		goto exit;
+
+	root_mc_dev = to_fsl_mc_device(dev);
+
+	if (kstrtoul(buf, 0, &val) < 0)
+		return -EINVAL;
+
+	if (val)
+		enable_dprc_irq(root_mc_dev);
+	else
+		disable_dprc_irq(root_mc_dev);
+
+exit:
+	return 0;
+}
+
+static int fsl_mc_bus_get_autorescan(struct device *dev, void *data)
+{
+	struct fsl_mc_device *root_mc_dev;
+	char *buf = data;
+
+	if (!fsl_mc_is_root_dprc(dev))
+		goto exit;
+
+	root_mc_dev = to_fsl_mc_device(dev);
+
+	sprintf(buf, "%d\n", get_dprc_irq_state(root_mc_dev));
+exit:
+	return 0;
+}
+
+static ssize_t autorescan_store(struct bus_type *bus,
+				const char *buf, size_t count)
+{
+	bus_for_each_dev(bus, NULL, (void *)buf, fsl_mc_bus_set_autorescan);
+
+	return count;
+}
+
+static ssize_t autorescan_show(struct bus_type *bus, char *buf)
+{
+	bus_for_each_dev(bus, NULL, (void *)buf, fsl_mc_bus_get_autorescan);
+	return strlen(buf);
+}
+
+static BUS_ATTR_RW(autorescan);
+
 static struct attribute *fsl_mc_bus_attrs[] = {
 	&bus_attr_rescan.attr,
+	&bus_attr_autorescan.attr,
 	NULL,
 };
 
diff --git a/drivers/bus/fsl-mc/fsl-mc-private.h b/drivers/bus/fsl-mc/fsl-mc-private.h
index 42bdb8679a36..1958fa065360 100644
--- a/drivers/bus/fsl-mc/fsl-mc-private.h
+++ b/drivers/bus/fsl-mc/fsl-mc-private.h
@@ -578,6 +578,7 @@ struct fsl_mc_bus {
 	struct mutex scan_mutex;    /* serializes bus scanning */
 	struct dprc_attributes dprc_attr;
 	struct fsl_mc_uapi uapi_misc;
+	int irq_enabled;
 };
 
 #define to_fsl_mc_bus(_mc_dev) \
@@ -656,4 +657,8 @@ static inline void fsl_mc_uapi_remove_device_file(struct fsl_mc_bus *mc_bus)
 
 #endif
 
+int disable_dprc_irq(struct fsl_mc_device *mc_dev);
+int enable_dprc_irq(struct fsl_mc_device *mc_dev);
+int get_dprc_irq_state(struct fsl_mc_device *mc_dev);
+
 #endif /* _FSL_MC_PRIVATE_H_ */
-- 
2.27.0


From e8fc84bfe4ba6372d55ed9f64410b0b93b32b91e Mon Sep 17 00:00:00 2001
From: Russell King <rmk+kernel@armlinux.org.uk>
Date: Tue, 24 Dec 2019 14:46:48 +0000
Subject: [PATCH 38/44] bus: fsl-mc: fix dprc object reading race

When modifying the objects attached to a DPRC, we may end up reading
the list of objects from the firmware while another thread is changing
changing the list. Since we read the objects via:

- Read the number of DPRC objects
- Iterate over this number of objects retrieving their details

and objects can be added in the middle of the list, this causes the
last few objects to unexpectedly disappear. The side effect of this
is if network interfaces are added after boot, they come and go. This
can result in already configured interfaces unexpectedly disappearing.

This has been easy to provoke with the restool interface added, and a
script which adds network interfaces one after each other; the kernel
rescanning runs asynchronously to restool.

NXP's approach to fixing this was to introduce a sysfs "attribute" in
their vendor tree, /sys/bus/fsl-mc/rescan, which userspace poked at to
request the kernel to rescan the DPRC object tree each time the
"restool" command completed (whether or not the tool changed anything.)
This has the effect of making the kernel's rescan synchronous with a
scripted restool, but still fails if we have multiple restools running
concurrently.

This patch takes a different approach:
- Read the number of DPRC objects
- Iterate over this number of objects retrieving their details
- Re-read the number of DPRC objects
- If the number of DPRC objects has changed while reading, repeat.

This solves the issue where network interfaces unexpectedly disappear
while adding others via ls-addni, because they've fallen off the end
of the object list.

This does *not* solve the issue that if an object is deleted while
another is added while we are reading the objects - that requires
firmware modification, or a more elaborate solution on the Linux side
(e.g., CRCing the object details and reading all objects at least
twice to check the CRC is stable.)

However, without firmware modification, this is probably the best way
to ensure that we read all the objects.

Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
---
 drivers/bus/fsl-mc/dprc-driver.c | 32 +++++++++++++++++++++++++++++---
 1 file changed, 29 insertions(+), 3 deletions(-)

diff --git a/drivers/bus/fsl-mc/dprc-driver.c b/drivers/bus/fsl-mc/dprc-driver.c
index df71c16f8a73..787844f0b636 100644
--- a/drivers/bus/fsl-mc/dprc-driver.c
+++ b/drivers/bus/fsl-mc/dprc-driver.c
@@ -240,11 +240,11 @@ static void dprc_add_new_devices(struct fsl_mc_device *mc_bus_dev,
 int dprc_scan_objects(struct fsl_mc_device *mc_bus_dev,
 		      bool alloc_interrupts)
 {
-	int num_child_objects;
+	int num_child_objects, num_child_objects2;
 	int dprc_get_obj_failures;
 	int error;
-	unsigned int irq_count = mc_bus_dev->obj_desc.irq_count;
-	struct fsl_mc_obj_desc *child_obj_desc_array = NULL;
+	unsigned int irq_count;
+	struct fsl_mc_obj_desc *child_obj_desc_array;
 	struct fsl_mc_bus *mc_bus = to_fsl_mc_bus(mc_bus_dev);
 
 	error = dprc_get_obj_count(mc_bus_dev->mc_io,
@@ -257,6 +257,9 @@ int dprc_scan_objects(struct fsl_mc_device *mc_bus_dev,
 		return error;
 	}
 
+retry:
+	irq_count = mc_bus_dev->obj_desc.irq_count;
+	child_obj_desc_array = NULL;
 	if (num_child_objects != 0) {
 		int i;
 
@@ -315,6 +318,29 @@ int dprc_scan_objects(struct fsl_mc_device *mc_bus_dev,
 		}
 	}
 
+	error = dprc_get_obj_count(mc_bus_dev->mc_io,
+				   0,
+				   mc_bus_dev->mc_handle,
+				   &num_child_objects2);
+	if (error < 0) {
+		if (child_obj_desc_array)
+			devm_kfree(&mc_bus_dev->dev, child_obj_desc_array);
+		dev_err(&mc_bus_dev->dev, "dprc_get_obj_count() failed: %d\n",
+			error);
+		return error;
+	}
+
+	if (num_child_objects != num_child_objects2) {
+		/*
+		 * Something changed while reading the number of objects.
+		 * Retry reading the child object list.
+		 */
+		if (child_obj_desc_array)
+			devm_kfree(&mc_bus_dev->dev, child_obj_desc_array);
+		num_child_objects = num_child_objects2;
+		goto retry;
+	}
+
 	/*
 	 * Allocate IRQ's before binding the scanned devices with their
 	 * respective drivers.
-- 
2.27.0


From ee4993484ed04fad479529d9c8f2df012df66f23 Mon Sep 17 00:00:00 2001
From: Russell King <rmk+kernel@armlinux.org.uk>
Date: Fri, 24 Jan 2020 17:59:49 +0000
Subject: [PATCH 39/44] iommu: silence iommu group prints

On the LX2160A, there are lots (about 160) of IOMMU messages produced
during boot; this is excessive.  Reduce the severity of these messages
to debug level.

Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
---
 drivers/iommu/iommu.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index 0d9adce6d812..a3b968fd0db0 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -845,7 +845,7 @@ int iommu_group_add_device(struct iommu_group *group, struct device *dev)
 
 	trace_add_device_to_group(group->id, dev);
 
-	dev_info(dev, "Adding to iommu group %d\n", group->id);
+	dev_dbg(dev, "Adding to iommu group %d\n", group->id);
 
 	return 0;
 
@@ -879,7 +879,7 @@ void iommu_group_remove_device(struct device *dev)
 	struct iommu_group *group = dev->iommu_group;
 	struct group_device *tmp_device, *device = NULL;
 
-	dev_info(dev, "Removing from iommu group %d\n", group->id);
+	dev_dbg(dev, "Removing from iommu group %d\n", group->id);
 
 	/* Pre-notify listeners that a device is being removed. */
 	blocking_notifier_call_chain(&group->notifier,
-- 
2.27.0


From 98c61f7a421af20214a5aec5a28885cac0eef605 Mon Sep 17 00:00:00 2001
From: Russell King <rmk+kernel@armlinux.org.uk>
Date: Fri, 8 Jan 2021 17:28:23 +0000
Subject: [PATCH 40/44] net: pcs: add pcs-lynx 1000BASE-X support

Add support for 1000BASE-X to pcs-lynx for the LX2160A.

This commit prepares the ground work for allowing 1G fiber connections
to be used with DPAA2 on the SolidRun CEX7 platforms.

Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
---
 drivers/net/pcs/pcs-lynx.c | 36 ++++++++++++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)

diff --git a/drivers/net/pcs/pcs-lynx.c b/drivers/net/pcs/pcs-lynx.c
index 62bb9272dcb2..af36cd647bf5 100644
--- a/drivers/net/pcs/pcs-lynx.c
+++ b/drivers/net/pcs/pcs-lynx.c
@@ -11,6 +11,7 @@
 #define LINK_TIMER_VAL(ns)		((u32)((ns) / SGMII_CLOCK_PERIOD_NS))
 
 #define SGMII_AN_LINK_TIMER_NS		1600000 /* defined by SGMII spec */
+#define IEEE8023_LINK_TIMER_NS		10000000
 
 #define LINK_TIMER_LO			0x12
 #define LINK_TIMER_HI			0x13
@@ -83,6 +84,7 @@ static void lynx_pcs_get_state(struct phylink_pcs *pcs,
 	struct lynx_pcs *lynx = phylink_pcs_to_lynx(pcs);
 
 	switch (state->interface) {
+	case PHY_INTERFACE_MODE_1000BASEX:
 	case PHY_INTERFACE_MODE_SGMII:
 	case PHY_INTERFACE_MODE_QSGMII:
 		phylink_mii_c22_pcs_get_state(lynx->mdio, state);
@@ -108,6 +110,30 @@ static void lynx_pcs_get_state(struct phylink_pcs *pcs,
 		state->link, state->an_enabled, state->an_complete);
 }
 
+static int lynx_pcs_config_1000basex(struct mdio_device *pcs,
+				     unsigned int mode,
+				     const unsigned long *advertising)
+{
+	struct mii_bus *bus = pcs->bus;
+	int addr = pcs->addr;
+	u32 link_timer;
+	int err;
+
+	link_timer = LINK_TIMER_VAL(IEEE8023_LINK_TIMER_NS);
+	mdiobus_write(bus, addr, LINK_TIMER_LO, link_timer & 0xffff);
+	mdiobus_write(bus, addr, LINK_TIMER_HI, link_timer >> 16);
+
+	err = mdiobus_modify(bus, addr, IF_MODE,
+			     IF_MODE_SGMII_EN | IF_MODE_USE_SGMII_AN,
+			     0);
+	if (err)
+		return err;
+
+	return phylink_mii_c22_pcs_config(pcs, mode,
+					  PHY_INTERFACE_MODE_1000BASEX,
+					  advertising);
+}
+
 static int lynx_pcs_config_sgmii(struct mdio_device *pcs, unsigned int mode,
 				 const unsigned long *advertising)
 {
@@ -163,6 +189,8 @@ static int lynx_pcs_config(struct phylink_pcs *pcs, unsigned int mode,
 	struct lynx_pcs *lynx = phylink_pcs_to_lynx(pcs);
 
 	switch (ifmode) {
+	case PHY_INTERFACE_MODE_1000BASEX:
+		return lynx_pcs_config_1000basex(lynx->mdio, mode, advertising);
 	case PHY_INTERFACE_MODE_SGMII:
 	case PHY_INTERFACE_MODE_QSGMII:
 		return lynx_pcs_config_sgmii(lynx->mdio, mode, advertising);
@@ -185,6 +213,13 @@ static int lynx_pcs_config(struct phylink_pcs *pcs, unsigned int mode,
 	return 0;
 }
 
+static void lynx_pcs_an_restart(struct phylink_pcs *pcs)
+{
+	struct lynx_pcs *lynx = phylink_pcs_to_lynx(pcs);
+
+	phylink_mii_c22_pcs_an_restart(lynx->mdio);
+}
+
 static void lynx_pcs_link_up_sgmii(struct mdio_device *pcs, unsigned int mode,
 				   int speed, int duplex)
 {
@@ -290,6 +325,7 @@ static void lynx_pcs_link_up(struct phylink_pcs *pcs, unsigned int mode,
 static const struct phylink_pcs_ops lynx_pcs_phylink_ops = {
 	.pcs_get_state = lynx_pcs_get_state,
 	.pcs_config = lynx_pcs_config,
+	.pcs_an_restart = lynx_pcs_an_restart,
 	.pcs_link_up = lynx_pcs_link_up,
 };
 
-- 
2.27.0


From 97f4006a98bc3fccad8318f3a728fd270db3aff6 Mon Sep 17 00:00:00 2001
From: Russell King <rmk+kernel@armlinux.org.uk>
Date: Thu, 30 Jan 2020 22:42:38 +0000
Subject: [PATCH 41/44] net: dpaa2-mac: add 1000BASE-X support

Now that pcs-lynx supports 1000BASE-X, add support for this interface
mode to dpaa2-mac. pcs-lynx can be switched at runtime between SGMII
and 1000BASE-X mode, so allow dpaa2-mac to switch between these as
well.

This commit prepares the ground work for allowing 1G fiber connections
to be used with DPAA2 on the SolidRun CEX7 platforms.

Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
---
 .../net/ethernet/freescale/dpaa2/dpaa2-mac.c  | 20 ++++++++++++++++---
 1 file changed, 17 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/freescale/dpaa2/dpaa2-mac.c b/drivers/net/ethernet/freescale/dpaa2/dpaa2-mac.c
index efd804d4a1bf..1b347dbced9f 100644
--- a/drivers/net/ethernet/freescale/dpaa2/dpaa2-mac.c
+++ b/drivers/net/ethernet/freescale/dpaa2/dpaa2-mac.c
@@ -94,10 +94,20 @@ static bool dpaa2_mac_phy_mode_mismatch(struct dpaa2_mac *mac,
 					phy_interface_t interface)
 {
 	switch (interface) {
+	/* We can switch between SGMII and 1000BASE-X at runtime with
+	 * pcs-lynx
+	 */
+	case PHY_INTERFACE_MODE_SGMII:
+	case PHY_INTERFACE_MODE_1000BASEX:
+		if (mac->pcs &&
+		    (mac->if_mode == PHY_INTERFACE_MODE_SGMII ||
+		     mac->if_mode == PHY_INTERFACE_MODE_1000BASEX))
+			return false;
+		return interface != mac->if_mode;
+
 	case PHY_INTERFACE_MODE_10GBASER:
 	case PHY_INTERFACE_MODE_USXGMII:
 	case PHY_INTERFACE_MODE_QSGMII:
-	case PHY_INTERFACE_MODE_SGMII:
 	case PHY_INTERFACE_MODE_RGMII:
 	case PHY_INTERFACE_MODE_RGMII_ID:
 	case PHY_INTERFACE_MODE_RGMII_RXID:
@@ -137,13 +147,17 @@ static void dpaa2_mac_validate(struct phylink_config *config,
 		fallthrough;
 	case PHY_INTERFACE_MODE_SGMII:
 	case PHY_INTERFACE_MODE_QSGMII:
+	case PHY_INTERFACE_MODE_1000BASEX:
 	case PHY_INTERFACE_MODE_RGMII:
 	case PHY_INTERFACE_MODE_RGMII_ID:
 	case PHY_INTERFACE_MODE_RGMII_RXID:
 	case PHY_INTERFACE_MODE_RGMII_TXID:
-		phylink_set(mask, 10baseT_Full);
-		phylink_set(mask, 100baseT_Full);
+		phylink_set(mask, 1000baseX_Full);
 		phylink_set(mask, 1000baseT_Full);
+		if (state->interface == PHY_INTERFACE_MODE_1000BASEX)
+			break;
+		phylink_set(mask, 100baseT_Full);
+		phylink_set(mask, 10baseT_Full);
 		break;
 	default:
 		goto empty_set;
-- 
2.27.0


From a6e20163eca58246419e02a26e0c4a6b163cbb2f Mon Sep 17 00:00:00 2001
From: Russell King <rmk+kernel@armlinux.org.uk>
Date: Thu, 30 Jan 2020 22:42:38 +0000
Subject: [PATCH 42/44] net: dpaa2-mac: add backplane link mode support

Add support for backplane link mode, which is, according to discussions
with NXP earlier in the year, is a mode where the OS (Linux) is able to
manage the PCS and Serdes itself.

This commit prepares the ground work for allowing 1G fiber connections
to be used with DPAA2 on the SolidRun CEX7 platforms.

Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
---
 drivers/net/ethernet/freescale/dpaa2/dpaa2-mac.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/freescale/dpaa2/dpaa2-mac.c b/drivers/net/ethernet/freescale/dpaa2/dpaa2-mac.c
index 1b347dbced9f..272b4b4aac92 100644
--- a/drivers/net/ethernet/freescale/dpaa2/dpaa2-mac.c
+++ b/drivers/net/ethernet/freescale/dpaa2/dpaa2-mac.c
@@ -365,8 +365,9 @@ int dpaa2_mac_connect(struct dpaa2_mac *mac)
 		goto err_put_node;
 	}
 
-	if (mac->attr.link_type == DPMAC_LINK_TYPE_PHY &&
-	    mac->attr.eth_if != DPMAC_ETH_IF_RGMII) {
+	if ((mac->attr.link_type == DPMAC_LINK_TYPE_PHY &&
+	    mac->attr.eth_if != DPMAC_ETH_IF_RGMII) ||
+	    mac->attr.link_type == DPMAC_LINK_TYPE_BACKPLANE) {
 		err = dpaa2_pcs_create(mac, dpmac_node, mac->attr.id);
 		if (err)
 			goto err_put_node;
-- 
2.27.0


From cf1521adcf9e9cdfe76709896f15328e4a573c49 Mon Sep 17 00:00:00 2001
From: Russell King <rmk+kernel@armlinux.org.uk>
Date: Thu, 30 Jan 2020 22:42:38 +0000
Subject: [PATCH 43/44] net: dpaa2-mac: add support for more 10G modes

Phylink documentation says:
 * Note that the PHY may be able to transform from one connection
 * technology to another, so, eg, don't clear 1000BaseX just
 * because the MAC is unable to BaseX mode. This is more about
 * clearing unsupported speeds and duplex settings. The port modes
 * should not be cleared; phylink_set_port_modes() will help with this.

So add the missing 10G modes.

Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
---
 drivers/net/ethernet/freescale/dpaa2/dpaa2-mac.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/net/ethernet/freescale/dpaa2/dpaa2-mac.c b/drivers/net/ethernet/freescale/dpaa2/dpaa2-mac.c
index 272b4b4aac92..708aced0ed47 100644
--- a/drivers/net/ethernet/freescale/dpaa2/dpaa2-mac.c
+++ b/drivers/net/ethernet/freescale/dpaa2/dpaa2-mac.c
@@ -140,6 +140,12 @@ static void dpaa2_mac_validate(struct phylink_config *config,
 	case PHY_INTERFACE_MODE_10GBASER:
 	case PHY_INTERFACE_MODE_USXGMII:
 		phylink_set(mask, 10000baseT_Full);
+		phylink_set(mask, 10000baseKR_Full);
+		phylink_set(mask, 10000baseCR_Full);
+		phylink_set(mask, 10000baseSR_Full);
+		phylink_set(mask, 10000baseLR_Full);
+		phylink_set(mask, 10000baseLRM_Full);
+		phylink_set(mask, 10000baseER_Full);
 		if (state->interface == PHY_INTERFACE_MODE_10GBASER)
 			break;
 		phylink_set(mask, 5000baseT_Full);
-- 
2.27.0


From 4c71505dce5df9254daacb96c7a869741289a461 Mon Sep 17 00:00:00 2001
From: Ioana Ciornei <ioana.ciornei@nxp.com>
Date: Thu, 21 Nov 2019 21:15:25 +0200
Subject: [PATCH 44/44] dpaa2-eth: do not hold rtnl_lock on phylink_create() or
 _destroy()

The rtnl_lock should not be held when calling phylink_create() or
phylink_destroy() since it leads to the deadlock listed below:

[   18.656576]  rtnl_lock+0x18/0x20
[   18.659798]  sfp_bus_add_upstream+0x28/0x90
[   18.663974]  phylink_create+0x2cc/0x828
[   18.667803]  dpaa2_mac_connect+0x14c/0x2a8
[   18.671890]  dpaa2_eth_connect_mac+0x94/0xd8

Fix this by moving the _lock() and _unlock() calls just outside of
phylink_of_phy_connect() and phylink_disconnect_phy().

Fixes: 719479230893 ("dpaa2-eth: add MAC/PHY support through phylink")
Reported-by: Russell King <linux@armlinux.org.uk>
Signed-off-by: Ioana Ciornei <ioana.ciornei@nxp.com>
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
---
 drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c | 4 ----
 drivers/net/ethernet/freescale/dpaa2/dpaa2-mac.c | 4 ++++
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c b/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c
index 0351b2b65bff..a63c35abf96b 100644
--- a/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c
+++ b/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c
@@ -4120,12 +4120,10 @@ static irqreturn_t dpni_irq0_handler_thread(int irq_num, void *arg)
 		dpaa2_eth_set_mac_addr(netdev_priv(net_dev));
 		dpaa2_eth_update_tx_fqids(priv);
 
-		rtnl_lock();
 		if (priv->mac)
 			dpaa2_eth_disconnect_mac(priv);
 		else
 			dpaa2_eth_connect_mac(priv);
-		rtnl_unlock();
 	}
 
 	return IRQ_HANDLED;
@@ -4415,9 +4413,7 @@ static int dpaa2_eth_remove(struct fsl_mc_device *ls_dev)
 #ifdef CONFIG_DEBUG_FS
 	dpaa2_dbg_remove(priv);
 #endif
-	rtnl_lock();
 	dpaa2_eth_disconnect_mac(priv);
-	rtnl_unlock();
 
 	unregister_netdev(net_dev);
 
diff --git a/drivers/net/ethernet/freescale/dpaa2/dpaa2-mac.c b/drivers/net/ethernet/freescale/dpaa2/dpaa2-mac.c
index 708aced0ed47..31222b2305da 100644
--- a/drivers/net/ethernet/freescale/dpaa2/dpaa2-mac.c
+++ b/drivers/net/ethernet/freescale/dpaa2/dpaa2-mac.c
@@ -394,7 +394,9 @@ int dpaa2_mac_connect(struct dpaa2_mac *mac)
 	if (mac->pcs)
 		phylink_set_pcs(mac->phylink, &mac->pcs->pcs);
 
+	rtnl_lock();
 	err = phylink_fwnode_phy_connect(mac->phylink, dpmac_node, 0);
+	rtnl_unlock();
 	if (err) {
 		netdev_err(net_dev, "phylink_fwnode_phy_connect() = %d\n", err);
 		goto err_phylink_destroy;
@@ -419,7 +421,9 @@ void dpaa2_mac_disconnect(struct dpaa2_mac *mac)
 	if (!mac->phylink)
 		return;
 
+	rtnl_lock();
 	phylink_disconnect_phy(mac->phylink);
+	rtnl_unlock();
 	phylink_destroy(mac->phylink);
 	dpaa2_pcs_destroy(mac);
 }
-- 
2.27.0