From b424b4bfd555654fc41996e964bdd0495f585793 Mon Sep 17 00:00:00 2001

From: Alison Schofield <alison.schofield@intel.com>

Date: Tue, 22 Feb 2022 11:56:07 -0800

Subject: [PATCH 136/217] libcxl: add interfaces for SET_PARTITION_INFO mailbox

 command

The CXL PMEM provisioning model depends upon the CXL mailbox command

SET_PARTITION_INFO to change a device's partitioning between volatile

and persistent capacity.

Add interfaces to libcxl to allocate and send a SET_PARTITION_INFO

mailbox command as defined in the CXL 2.0 specification.

Link: https://lore.kernel.org/r/978c1cf78f3dd22f6070e51a241bc63cac9297de.1645558189.git.alison.schofield@intel.com

Reviewed-by: Dan Williams <dan.j.williams@intel.com>

Signed-off-by: Alison Schofield <alison.schofield@intel.com>

Signed-off-by: Vishal Verma <vishal.l.verma@intel.com>

---

 Documentation/cxl/lib/libcxl.txt | 11 +++++++++++

 cxl/lib/libcxl.c                 | 28 ++++++++++++++++++++++++++++

 cxl/lib/libcxl.sym               |  2 ++

 cxl/lib/private.h                |  8 ++++++++

 cxl/libcxl.h                     | 10 ++++++++++

 5 files changed, 59 insertions(+)

diff --git a/Documentation/cxl/lib/libcxl.txt b/Documentation/cxl/lib/libcxl.txt

index a6986ab..7b223cb 100644

--- a/Documentation/cxl/lib/libcxl.txt

+++ b/Documentation/cxl/lib/libcxl.txt

@@ -132,6 +132,8 @@ int cxl_memdev_read_label(struct cxl_memdev *memdev, void *buf, size_t length,

 int cxl_memdev_write_label(struct cxl_memdev *memdev, void *buf, size_t length,

 			   size_t offset);

 struct cxl_cmd *cxl_cmd_new_get_partition(struct cxl_memdev *memdev);

+struct cxl_cmd *cxl_cmd_new_set_partition(struct cxl_memdev *memdev,

+					  unsigned long long volatile_size);

 ----

@@ -148,6 +150,8 @@ this sub-class of interfaces, there are:

    a CXL standard opcode. See the potential command ids in

    /usr/include/linux/cxl_mem.h.

+ * 'cxl_cmd_<name>_set_<field>' interfaces that set specific fields in a cxl_cmd

+

  * 'cxl_cmd_submit' which submits the command via ioctl()

  * 'cxl_cmd_<name>_get_<field>' interfaces that get specific fields out of the

@@ -167,6 +171,13 @@ cxl_memdev{read,write,zero}_label() are helpers for marshaling multiple

 label access commands over an arbitrary extent of the device's label

 area.

+cxl_cmd_partition_set_mode() supports selecting NEXTBOOT or IMMEDIATE

+mode. When CXL_SETPART_IMMEDIATE mode is set, it is the caller’s

+responsibility to avoid immediate changes to partitioning when the

+device is in use. When CXL_SETPART_NEXTBOOT mode is set, the change

+in partitioning shall become the “next” configuration, to become

+active on the next device reset.

+

 BUSES

 -----

 The CXL Memory space is CPU and Device coherent. The address ranges that

diff --git a/cxl/lib/libcxl.c b/cxl/lib/libcxl.c

index c05c13c..daa2bbc 100644

--- a/cxl/lib/libcxl.c

+++ b/cxl/lib/libcxl.c

@@ -2478,6 +2478,34 @@ cxl_cmd_partition_get_next_persistent_size(struct cxl_cmd *cmd)

 	return cxl_capacity_to_bytes(c->next_persistent);

 }

+CXL_EXPORT int cxl_cmd_partition_set_mode(struct cxl_cmd *cmd,

+		enum cxl_setpartition_mode mode)

+{

+	struct cxl_cmd_set_partition *setpart = cmd->input_payload;

+

+	if (mode == CXL_SETPART_IMMEDIATE)

+		setpart->flags = CXL_CMD_SET_PARTITION_FLAG_IMMEDIATE;

+	else

+		setpart->flags = !CXL_CMD_SET_PARTITION_FLAG_IMMEDIATE;

+

+	return 0;

+}

+

+CXL_EXPORT struct cxl_cmd *cxl_cmd_new_set_partition(struct cxl_memdev *memdev,

+		unsigned long long volatile_size)

+{

+	struct cxl_cmd_set_partition *setpart;

+	struct cxl_cmd *cmd;

+

+	cmd = cxl_cmd_new_generic(memdev,

+			CXL_MEM_COMMAND_ID_SET_PARTITION_INFO);

+

+	setpart = cmd->input_payload;

+	setpart->volatile_size = cpu_to_le64(volatile_size)

+					/ CXL_CAPACITY_MULTIPLIER;

+	return cmd;

+}

+

 CXL_EXPORT int cxl_cmd_submit(struct cxl_cmd *cmd)

 {

 	struct cxl_memdev *memdev = cmd->memdev;

diff --git a/cxl/lib/libcxl.sym b/cxl/lib/libcxl.sym

index 5ac6e9b..aab1112 100644

--- a/cxl/lib/libcxl.sym

+++ b/cxl/lib/libcxl.sym

@@ -163,4 +163,6 @@ global:

 	cxl_cmd_identify_get_total_size;

 	cxl_cmd_identify_get_volatile_only_size;

 	cxl_cmd_identify_get_persistent_only_size;

+	cxl_cmd_new_set_partition;

+	cxl_cmd_partition_set_mode;

 } LIBCXL_1;

diff --git a/cxl/lib/private.h b/cxl/lib/private.h

index 7f3a562..c6d88f7 100644

--- a/cxl/lib/private.h

+++ b/cxl/lib/private.h

@@ -195,6 +195,14 @@ struct cxl_cmd_get_partition {

 #define CXL_CAPACITY_MULTIPLIER		SZ_256M

+struct cxl_cmd_set_partition {

+	le64 volatile_size;

+	u8 flags;

+} __attribute__((packed));

+

+/* CXL 2.0 8.2.9.5.2 Set Partition Info */

+#define CXL_CMD_SET_PARTITION_FLAG_IMMEDIATE				BIT(0)

+

 /* CXL 2.0 8.2.9.5.3 Byte 0 Health Status */

 #define CXL_CMD_HEALTH_INFO_STATUS_MAINTENANCE_NEEDED_MASK		BIT(0)

 #define CXL_CMD_HEALTH_INFO_STATUS_PERFORMANCE_DEGRADED_MASK		BIT(1)

diff --git a/cxl/libcxl.h b/cxl/libcxl.h

index 6e18e84..0063d31 100644

--- a/cxl/libcxl.h

+++ b/cxl/libcxl.h

@@ -250,6 +250,16 @@ unsigned long long cxl_cmd_partition_get_active_volatile_size(struct cxl_cmd *cm

 unsigned long long cxl_cmd_partition_get_active_persistent_size(struct cxl_cmd *cmd);

 unsigned long long cxl_cmd_partition_get_next_volatile_size(struct cxl_cmd *cmd);

 unsigned long long cxl_cmd_partition_get_next_persistent_size(struct cxl_cmd *cmd);

+struct cxl_cmd *cxl_cmd_new_set_partition(struct cxl_memdev *memdev,

+		unsigned long long volatile_size);

+

+enum cxl_setpartition_mode {

+	CXL_SETPART_NEXTBOOT,

+	CXL_SETPART_IMMEDIATE,

+};

+

+int cxl_cmd_partition_set_mode(struct cxl_cmd *cmd,

+		enum cxl_setpartition_mode mode);

 #ifdef __cplusplus

 } /* extern "C" */

-- 

2.27.0