[ndctl PATCH v4 10/17] libcxl: add label_size to cxl_memdev, and an API to retrieve it

[Vishal Verma <vishal.l.verma@intel.com>]

Size of the Label Storage Area (LSA) is available as a sysfs attribute
called 'label_storage_size'. Add that to libcxl's memdev so that it is available
for label related commands.

Signed-off-by: Vishal Verma <vishal.l.verma@intel.com>
---
 cxl/lib/private.h  |  1 +
 cxl/lib/libcxl.c   | 12 ++++++++++++
 cxl/libcxl.h       |  1 +
 cxl/lib/libcxl.sym |  5 +++++
 4 files changed, 19 insertions(+)

diff --git a/cxl/lib/private.h b/cxl/lib/private.h
index 9c6317b..671f12f 100644
--- a/cxl/lib/private.h
+++ b/cxl/lib/private.h
@@ -21,6 +21,7 @@ struct cxl_memdev {
 	unsigned long long pmem_size;
 	unsigned long long ram_size;
 	int payload_max;
+	size_t lsa_size;
 	struct kmod_module *module;
 };
 
diff --git a/cxl/lib/libcxl.c b/cxl/lib/libcxl.c
index 33cc462..de3a8f7 100644
--- a/cxl/lib/libcxl.c
+++ b/cxl/lib/libcxl.c
@@ -247,6 +247,13 @@ static void *add_cxl_memdev(void *parent, int id, const char *cxlmem_base)
 	if (memdev->payload_max < 0)
 		goto err_read;
 
+	sprintf(path, "%s/label_storage_size", cxlmem_base);
+	if (sysfs_read_attr(ctx, path, buf) < 0)
+		goto err_read;
+	memdev->lsa_size = strtoull(buf, NULL, 0);
+	if (memdev->lsa_size == ULLONG_MAX)
+		goto err_read;
+
 	memdev->dev_path = strdup(cxlmem_base);
 	if (!memdev->dev_path)
 		goto err_read;
@@ -350,6 +357,11 @@ CXL_EXPORT const char *cxl_memdev_get_firmware_verison(struct cxl_memdev *memdev
 	return memdev->firmware_version;
 }
 
+CXL_EXPORT size_t cxl_memdev_get_label_size(struct cxl_memdev *memdev)
+{
+	return memdev->lsa_size;
+}
+
 CXL_EXPORT void cxl_cmd_unref(struct cxl_cmd *cmd)
 {
 	if (!cmd)
diff --git a/cxl/libcxl.h b/cxl/libcxl.h
index 7408745..d3b97a1 100644
--- a/cxl/libcxl.h
+++ b/cxl/libcxl.h
@@ -42,6 +42,7 @@ struct cxl_ctx *cxl_memdev_get_ctx(struct cxl_memdev *memdev);
 unsigned long long cxl_memdev_get_pmem_size(struct cxl_memdev *memdev);
 unsigned long long cxl_memdev_get_ram_size(struct cxl_memdev *memdev);
 const char *cxl_memdev_get_firmware_verison(struct cxl_memdev *memdev);
+size_t cxl_memdev_get_label_size(struct cxl_memdev *memdev);
 
 #define cxl_memdev_foreach(ctx, memdev) \
         for (memdev = cxl_memdev_get_first(ctx); \
diff --git a/cxl/lib/libcxl.sym b/cxl/lib/libcxl.sym
index 1b608d8..b9feb93 100644
--- a/cxl/lib/libcxl.sym
+++ b/cxl/lib/libcxl.sym
@@ -75,3 +75,8 @@ global:
 	cxl_cmd_new_read_label;
 	cxl_cmd_read_label_get_payload;
 } LIBCXL_2;
+
+LIBCXL_4 {
+global:
+	cxl_memdev_get_label_size;
+} LIBCXL_3;
-- 
2.31.1