[ndctl PATCH v2 5/6] libcxl: add interfaces for SET_PARTITION_INFO mailbox command

[alison.schofield@intel.com]

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

Users may want the ability to change the partition layout of a CXL
memory device.

Add interfaces to libcxl to allocate and send a SET_PARTITION_INFO
mailbox as defined in the CXL 2.0 specification.

Signed-off-by: Alison Schofield <alison.schofield@intel.com>
---
 cxl/lib/libcxl.c   | 50 ++++++++++++++++++++++++++++++++++++++++++++++
 cxl/lib/libcxl.sym |  5 +++++
 cxl/lib/private.h  |  8 ++++++++
 cxl/libcxl.h       |  5 +++++
 4 files changed, 68 insertions(+)

diff --git a/cxl/lib/libcxl.c b/cxl/lib/libcxl.c
index 823bcb0..30c8f23 100644
--- a/cxl/lib/libcxl.c
+++ b/cxl/lib/libcxl.c
@@ -1230,6 +1230,21 @@ cxl_cmd_partition_info_get_next_persistent_bytes(struct cxl_cmd *cmd)
 	cmd_partition_get_capacity_field(cmd, next_persistent_cap);
 }
 
+CXL_EXPORT struct cxl_cmd *cxl_cmd_new_set_partition_info(struct cxl_memdev *memdev,
+		unsigned long long volatile_capacity, int flags)
+{
+	struct cxl_cmd_set_partition_info *set_partition;
+	struct cxl_cmd *cmd;
+
+	cmd = cxl_cmd_new_generic(memdev,
+			CXL_MEM_COMMAND_ID_SET_PARTITION_INFO);
+
+	set_partition = (struct cxl_cmd_set_partition_info *)cmd->send_cmd->in.payload;
+	set_partition->volatile_capacity = cpu_to_le64(volatile_capacity);
+	set_partition->flags = flags;
+	return cmd;
+}
+
 CXL_EXPORT int cxl_cmd_submit(struct cxl_cmd *cmd)
 {
 	struct cxl_memdev *memdev = cmd->memdev;
@@ -1428,3 +1443,38 @@ CXL_EXPORT int cxl_memdev_read_label(struct cxl_memdev *memdev, void *buf,
 {
 	return lsa_op(memdev, LSA_OP_GET, buf, length, offset);
 }
+
+CXL_EXPORT int cxl_memdev_set_partition_info(struct cxl_memdev *memdev,
+	       unsigned long long volatile_capacity, int flags)
+{
+	struct cxl_ctx *ctx = cxl_memdev_get_ctx(memdev);
+	struct cxl_cmd *cmd;
+	int rc;
+
+	dbg(ctx, "%s: enter cap: %llx, flags %d\n", __func__,
+		volatile_capacity, flags);
+
+	cmd = cxl_cmd_new_set_partition_info(memdev,
+			volatile_capacity / CXL_CAPACITY_MULTIPLIER, flags);
+	if (!cmd)
+		return -ENXIO;
+
+	rc = cxl_cmd_submit(cmd);
+	if (rc < 0) {
+		err(ctx, "cmd submission failed: %s\n", strerror(-rc));
+		goto err;
+	}
+	rc = cxl_cmd_get_mbox_status(cmd);
+	if (rc != 0) {
+		err(ctx, "%s: mbox status: %d\n", __func__, rc);
+		rc = -ENXIO;
+	}
+err:
+	cxl_cmd_unref(cmd);
+	return rc;
+}
+
+CXL_EXPORT int cxl_cmd_partition_info_flag_immediate(void)
+{
+	return CXL_CMD_SET_PARTITION_INFO_FLAG_IMMEDIATE;
+}
diff --git a/cxl/lib/libcxl.sym b/cxl/lib/libcxl.sym
index 1e2cf05..d5a0f5b 100644
--- a/cxl/lib/libcxl.sym
+++ b/cxl/lib/libcxl.sym
@@ -78,6 +78,11 @@ global:
 	cxl_cmd_partition_info_get_active_persistent_bytes;
 	cxl_cmd_partition_info_get_next_volatile_bytes;
 	cxl_cmd_partition_info_get_next_persistent_bytes;
+	cxl_cmd_new_set_partition_info;
+	cxl_memdev_set_partition_info;
+	cxl_cmd_partition_info_flag_none;
+	cxl_cmd_partition_info_flag_immediate;
+
 local:
         *;
 };
diff --git a/cxl/lib/private.h b/cxl/lib/private.h
index dd9234f..4da8ea7 100644
--- a/cxl/lib/private.h
+++ b/cxl/lib/private.h
@@ -114,6 +114,14 @@ struct cxl_cmd_get_partition_info {
 
 #define CXL_CAPACITY_MULTIPLIER		SZ_256M
 
+struct cxl_cmd_set_partition_info {
+	le64 volatile_capacity;
+	u8 flags;
+} __attribute__((packed));
+
+/* CXL 2.0 8.2.9.5.2 Set Partition Info */
+#define CXL_CMD_SET_PARTITION_INFO_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 f19ed4f..8f1a330 100644
--- a/cxl/libcxl.h
+++ b/cxl/libcxl.h
@@ -50,6 +50,8 @@ int cxl_memdev_read_label(struct cxl_memdev *memdev, void *buf, size_t length,
 		size_t offset);
 int cxl_memdev_write_label(struct cxl_memdev *memdev, void *buf, size_t length,
 		size_t offset);
+int cxl_memdev_set_partition_info(struct cxl_memdev *memdev,
+		unsigned long long volatile_capacity, int flags);
 
 #define cxl_memdev_foreach(ctx, memdev) \
         for (memdev = cxl_memdev_get_first(ctx); \
@@ -117,6 +119,9 @@ unsigned long long cxl_cmd_partition_info_get_active_volatile_bytes(struct cxl_c
 unsigned long long cxl_cmd_partition_info_get_active_persistent_bytes(struct cxl_cmd *cmd);
 unsigned long long cxl_cmd_partition_info_get_next_volatile_bytes(struct cxl_cmd *cmd);
 unsigned long long cxl_cmd_partition_info_get_next_persistent_bytes(struct cxl_cmd *cmd);
+struct cxl_cmd *cxl_cmd_new_set_partition_info(struct cxl_memdev *memdev,
+		unsigned long long volatile_capacity, int flags);
+int cxl_cmd_partition_info_flag_immediate(void);
 
 #ifdef __cplusplus
 } /* extern "C" */
-- 
2.31.1