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centosplus patch bug#15830
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From c6e2c1e1138fa5cb5bb99381132855bbaf712029 Mon Sep 17 00:00:00 2001
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From: Mika Westerberg <mika.westerberg@linux.intel.com>
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Date: Thu, 22 Dec 2016 13:17:07 +0300
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Subject: ACPI / watchdog: Print out error number when device creation fails
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If the platform device creation fails for whichever reason the driver
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prints out something like:
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  [    0.978837] ACPI: watchdog: Failed to create platform device
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However, that is quite confusing and does not include any information
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why it failed. To make it more understandable, reword it like:
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  [    0.978837] ACPI: watchdog: Device creation failed: -16
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Which tells that we failed to create the watchdog device because some of
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the resources were already reserved (-EBUSY).
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Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
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Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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Submitted-by: Pablo Greco <pablo@fliagreco.com.ar> 
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Applied-by:   Akemi Yagi <toracat@centos.org>
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---
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 drivers/acpi/acpi_watchdog.c | 2 +-
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 1 file changed, 1 insertion(+), 1 deletion(-)
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diff --git a/drivers/acpi/acpi_watchdog.c b/drivers/acpi/acpi_watchdog.c
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index 13caebd679f5..8c4e0a18460a 100644
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--- a/drivers/acpi/acpi_watchdog.c
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+++ b/drivers/acpi/acpi_watchdog.c
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@@ -114,7 +114,7 @@ void __init acpi_watchdog_init(void)
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 	pdev = platform_device_register_simple("wdat_wdt", PLATFORM_DEVID_NONE,
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 					       resources, nresources);
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 	if (IS_ERR(pdev))
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-		pr_err("Failed to create platform device\n");
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+		pr_err("Device creation failed: %ld\n", PTR_ERR(pdev));
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 	kfree(resources);
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-- 
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cgit 1.2-0.3.lf.el7
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From 31e86cb99a3af0653f0e317fdd9c05b530c70af8 Mon Sep 17 00:00:00 2001
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From: Ryan Kennedy <ryan5544@gmail.com>
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Date: Sat, 15 Jul 2017 17:48:18 -0400
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Subject: ACPI / watchdog: Fix init failure with overlapping register regions
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Partially overlapping regions cause platform device creation
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to fail. The latter of two overlapping resources will fail to be
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reserved. Fix this by merging overlapping resource ranges while
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enumerating WDAT table entries.
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Signed-off-by: Ryan Kennedy <ryan5544@gmail.com>
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Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com>
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Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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---
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 drivers/acpi/acpi_watchdog.c | 7 ++++++-
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 1 file changed, 6 insertions(+), 1 deletion(-)
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diff --git a/drivers/acpi/acpi_watchdog.c b/drivers/acpi/acpi_watchdog.c
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index 8c4e0a18460a..bf22c29d2517 100644
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--- a/drivers/acpi/acpi_watchdog.c
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+++ b/drivers/acpi/acpi_watchdog.c
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@@ -86,7 +86,12 @@ void __init acpi_watchdog_init(void)
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 		found = false;
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 		resource_list_for_each_entry(rentry, &resource_list) {
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-			if (resource_contains(rentry->res, &res)) {
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+			if (rentry->res->flags == res.flags &&
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+			    resource_overlaps(rentry->res, &res)) {
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+				if (res.start < rentry->res->start)
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+					rentry->res->start = res.start;
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+				if (res.end > rentry->res->end)
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+					rentry->res->end = res.end;
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 				found = true;
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 				break;
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 			}
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-- 
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cgit 1.2-0.3.lf.el7
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From 6ce14f6416c84bd9c81777edf899b57ac5000c87 Mon Sep 17 00:00:00 2001
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From: Arnd Bergmann <arnd@arndb.de>
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Date: Tue, 19 Sep 2017 01:49:02 +0200
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Subject: ACPI / watchdog: properly initialize resources
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We copy a local resource structure into a list, but only
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initialize some of its members, as pointed out by gcc-4.4:
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drivers/acpi/acpi_watchdog.c: In function 'acpi_watchdog_init':
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drivers/acpi/acpi_watchdog.c:105: error: 'res.child' may be used uninitialized in this function
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drivers/acpi/acpi_watchdog.c:105: error: 'res.sibling' may be used uninitialized in this function
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drivers/acpi/acpi_watchdog.c:105: error: 'res.parent' may be used uninitialized in this function
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drivers/acpi/acpi_watchdog.c:105: error: 'res.desc' may be used uninitialized in this function
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drivers/acpi/acpi_watchdog.c:105: error: 'res.name' may be used uninitialized in this function
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Newer compilers can presumably optimize the uninitialized access
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away entirely and don't warn at all, but rely on the kzalloc()
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to zero the structure first. This adds an explicit initialization
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to force consistent behavior.
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Fixes: 058dfc767008 (ACPI / watchdog: Add support for WDAT hardware watchdog)
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Signed-off-by: Arnd Bergmann <arnd@arndb.de>
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Acked-by: Guenter Roeck <linux@roeck-us.net>
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Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com>
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Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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---
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 drivers/acpi/acpi_watchdog.c | 2 +-
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 1 file changed, 1 insertion(+), 1 deletion(-)
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diff --git a/drivers/acpi/acpi_watchdog.c b/drivers/acpi/acpi_watchdog.c
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index bf22c29d2517..11b113f8e367 100644
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--- a/drivers/acpi/acpi_watchdog.c
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+++ b/drivers/acpi/acpi_watchdog.c
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@@ -66,7 +66,7 @@ void __init acpi_watchdog_init(void)
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 	for (i = 0; i < wdat->entries; i++) {
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 		const struct acpi_generic_address *gas;
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 		struct resource_entry *rentry;
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-		struct resource res;
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+		struct resource res = {};
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 		bool found;
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 		gas = &entries[i].register_region;
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-- 
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cgit 1.2-0.3.lf.el7
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From a0a37862a4e1844793d39aca9ccb8fecbdcb8659 Mon Sep 17 00:00:00 2001
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From: Mika Westerberg <mika.westerberg@linux.intel.com>
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Date: Mon, 23 Apr 2018 14:16:03 +0300
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Subject: ACPI / watchdog: Prefer iTCO_wdt on Lenovo Z50-70
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WDAT table on Lenovo Z50-70 is using RTC SRAM (ports 0x70 and 0x71) to
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store state of the timer. This conflicts with Linux RTC driver
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(rtc-cmos.c) who fails to reserve those ports for itself preventing RTC
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from functioning. In addition the WDAT table seems not to be fully
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functional because it does not reset the system when the watchdog times
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out.
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On this system iTCO_wdt works just fine so we simply prefer to use it
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instead of WDAT. This makes RTC working again and also results working
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watchdog via iTCO_wdt.
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Reported-by: Peter Milley <pbmilley@gmail.com>
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Link: https://bugzilla.kernel.org/show_bug.cgi?id=199033
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Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
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Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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---
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 drivers/acpi/acpi_watchdog.c | 59 ++++++++++++++++++++++++++++++++++++--------
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 1 file changed, 49 insertions(+), 10 deletions(-)
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diff --git a/drivers/acpi/acpi_watchdog.c b/drivers/acpi/acpi_watchdog.c
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index ebb626ffb5fa..4bde16fb97d8 100644
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--- a/drivers/acpi/acpi_watchdog.c
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+++ b/drivers/acpi/acpi_watchdog.c
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@@ -12,23 +12,64 @@
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 #define pr_fmt(fmt) "ACPI: watchdog: " fmt
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 #include <linux/acpi.h>
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+#include <linux/dmi.h>
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 #include <linux/ioport.h>
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 #include <linux/platform_device.h>
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 #include "internal.h"
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+static const struct dmi_system_id acpi_watchdog_skip[] = {
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+	{
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+		/*
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+		 * On Lenovo Z50-70 there are two issues with the WDAT
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+		 * table. First some of the instructions use RTC SRAM
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+		 * to store persistent information. This does not work well
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+		 * with Linux RTC driver. Second, more important thing is
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+		 * that the instructions do not actually reset the system.
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+		 *
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+		 * On this particular system iTCO_wdt seems to work just
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+		 * fine so we prefer that over WDAT for now.
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+		 *
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+		 * See also https://bugzilla.kernel.org/show_bug.cgi?id=199033.
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+		 */
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+		.ident = "Lenovo Z50-70",
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+		.matches = {
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+			DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
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+			DMI_MATCH(DMI_PRODUCT_NAME, "20354"),
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+			DMI_MATCH(DMI_PRODUCT_VERSION, "Lenovo Z50-70"),
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+		},
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+	},
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+	{}
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+};
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+
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+static const struct acpi_table_wdat *acpi_watchdog_get_wdat(void)
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+{
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+	const struct acpi_table_wdat *wdat = NULL;
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+	acpi_status status;
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+
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+	if (acpi_disabled)
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+		return NULL;
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+
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+	if (dmi_check_system(acpi_watchdog_skip))
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+		return NULL;
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+
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+	status = acpi_get_table(ACPI_SIG_WDAT, 0,
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+				(struct acpi_table_header **)&wdat);
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+	if (ACPI_FAILURE(status)) {
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+		/* It is fine if there is no WDAT */
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+		return NULL;
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+	}
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+
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+	return wdat;
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+}
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+
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 /**
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  * Returns true if this system should prefer ACPI based watchdog instead of
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  * the native one (which are typically the same hardware).
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  */
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 bool acpi_has_watchdog(void)
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 {
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-	struct acpi_table_header hdr;
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-
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-	if (acpi_disabled)
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-		return false;
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-
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-	return ACPI_SUCCESS(acpi_get_table_header(ACPI_SIG_WDAT, 0, &hdr));
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+	return !!acpi_watchdog_get_wdat();
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 }
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 EXPORT_SYMBOL_GPL(acpi_has_watchdog);
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@@ -41,12 +82,10 @@ void __init acpi_watchdog_init(void)
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 	struct platform_device *pdev;
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 	struct resource *resources;
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 	size_t nresources = 0;
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-	acpi_status status;
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 	int i;
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-	status = acpi_get_table(ACPI_SIG_WDAT, 0,
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-				(struct acpi_table_header **)&wdat);
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-	if (ACPI_FAILURE(status)) {
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+	wdat = acpi_watchdog_get_wdat();
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+	if (!wdat) {
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 		/* It is fine if there is no WDAT */
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 		return;
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 	}
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-- 
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cgit 1.2-0.3.lf.el7
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From 5a802a7a285c8877ca872e44eeb0f06afcb5212f Mon Sep 17 00:00:00 2001
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From: Mika Westerberg <mika.westerberg@linux.intel.com>
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Date: Tue, 22 May 2018 14:16:50 +0300
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Subject: ACPI / watchdog: Prefer iTCO_wdt always when WDAT table uses RTC SRAM
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After we added quirk for Lenovo Z50-70 it turns out there are at least
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two more systems where WDAT table includes instructions accessing RTC
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SRAM. Instead of quirking each system separately, look for such
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instructions in the table and automatically prefer iTCO_wdt if found.
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Link: https://bugzilla.kernel.org/show_bug.cgi?id=199033
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Reported-by: Arnold Guy <aurnoldg@gmail.com>
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Reported-by: Alois Nespor <nespor@fssp.cz>
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Reported-by: Yury Pakin <zxwarior@gmail.com>
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Reported-by: Ihor Chyhin <ihorchyhin@ukr.net>
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Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
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Acked-by: Guenter Roeck <linux@roeck-us.net>
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Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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---
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 drivers/acpi/acpi_watchdog.c | 72 +++++++++++++++++++++++++++-----------------
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 1 file changed, 45 insertions(+), 27 deletions(-)
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diff --git a/drivers/acpi/acpi_watchdog.c b/drivers/acpi/acpi_watchdog.c
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index 4bde16fb97d8..95600309ce42 100644
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--- a/drivers/acpi/acpi_watchdog.c
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+++ b/drivers/acpi/acpi_watchdog.c
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@@ -12,35 +12,51 @@
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 #define pr_fmt(fmt) "ACPI: watchdog: " fmt
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 #include <linux/acpi.h>
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-#include <linux/dmi.h>
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 #include <linux/ioport.h>
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 #include <linux/platform_device.h>
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 #include "internal.h"
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-static const struct dmi_system_id acpi_watchdog_skip[] = {
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-	{
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-		/*
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-		 * On Lenovo Z50-70 there are two issues with the WDAT
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-		 * table. First some of the instructions use RTC SRAM
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-		 * to store persistent information. This does not work well
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-		 * with Linux RTC driver. Second, more important thing is
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-		 * that the instructions do not actually reset the system.
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-		 *
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-		 * On this particular system iTCO_wdt seems to work just
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-		 * fine so we prefer that over WDAT for now.
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-		 *
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-		 * See also https://bugzilla.kernel.org/show_bug.cgi?id=199033.
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-		 */
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-		.ident = "Lenovo Z50-70",
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-		.matches = {
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-			DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
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-			DMI_MATCH(DMI_PRODUCT_NAME, "20354"),
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-			DMI_MATCH(DMI_PRODUCT_VERSION, "Lenovo Z50-70"),
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-		},
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-	},
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-	{}
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-};
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+#ifdef CONFIG_RTC_LIB
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+#include <linux/mc146818rtc.h>
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+
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+/*
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+ * There are several systems where the WDAT table is accessing RTC SRAM to
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+ * store persistent information. This does not work well with the Linux RTC
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+ * driver so on those systems we skip WDAT driver and prefer iTCO_wdt
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+ * instead.
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+ *
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+ * See also https://bugzilla.kernel.org/show_bug.cgi?id=199033.
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+ */
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+static bool acpi_watchdog_uses_rtc(const struct acpi_table_wdat *wdat)
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+{
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+	const struct acpi_wdat_entry *entries;
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+	int i;
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+
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+	entries = (struct acpi_wdat_entry *)(wdat + 1);
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+	for (i = 0; i < wdat->entries; i++) {
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+		const struct acpi_generic_address *gas;
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+
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+		gas = &entries[i].register_region;
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+		if (gas->space_id == ACPI_ADR_SPACE_SYSTEM_IO) {
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+			switch (gas->address) {
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+			case RTC_PORT(0):
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+			case RTC_PORT(1):
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+			case RTC_PORT(2):
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+			case RTC_PORT(3):
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+				return true;
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+			}
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+		}
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+	}
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+
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+	return false;
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+}
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+#else
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+static bool acpi_watchdog_uses_rtc(const struct acpi_table_wdat *wdat)
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+{
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+	return false;
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+}
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+#endif
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 static const struct acpi_table_wdat *acpi_watchdog_get_wdat(void)
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 {
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@@ -50,9 +66,6 @@ static const struct acpi_table_wdat *acpi_watchdog_get_wdat(void)
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 	if (acpi_disabled)
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 		return NULL;
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-	if (dmi_check_system(acpi_watchdog_skip))
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-		return NULL;
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-
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 	status = acpi_get_table(ACPI_SIG_WDAT, 0,
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 				(struct acpi_table_header **)&wdat);
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 	if (ACPI_FAILURE(status)) {
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@@ -60,6 +73,11 @@ static const struct acpi_table_wdat *acpi_watchdog_get_wdat(void)
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 		return NULL;
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 	}
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+	if (acpi_watchdog_uses_rtc(wdat)) {
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+		pr_info("Skipping WDAT on this system because it uses RTC SRAM\n");
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+		return NULL;
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+	}
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+
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 	return wdat;
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 }
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-- 
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cgit 1.2-0.3.lf.el7
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