[ndctl PATCH v6 3/6] libcxl: return the partition alignment field in bytes

[alison.schofield@intel.com]

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

Per the CXL specification, the partition alignment field reports
the alignment value in multiples of 256MB. In the libcxl API, values
for all capacity fields are defined to return bytes.

Update the partition alignment accessor to return bytes so that it
is in sync with other capacity related fields.

Since this is early in the development cycle, the expectation is that
no third party consumers of this library have come to depend on the
encoded capacity field. If that is not the case, the original format
can be restored, and a new _bytes version introduced.

Signed-off-by: Alison Schofield <alison.schofield@intel.com>
Reviewed-by: Dan Williams <dan.j.williams@intel.com>
---
 cxl/lib/libcxl.c | 13 +++++--------
 1 file changed, 5 insertions(+), 8 deletions(-)

diff --git a/cxl/lib/libcxl.c b/cxl/lib/libcxl.c
index 9413384b4b3b..c05c13c501ab 100644
--- a/cxl/lib/libcxl.c
+++ b/cxl/lib/libcxl.c
@@ -2308,15 +2308,12 @@ CXL_EXPORT int cxl_cmd_identify_get_fw_rev(struct cxl_cmd *cmd, char *fw_rev,
 CXL_EXPORT unsigned long long cxl_cmd_identify_get_partition_align(
 		struct cxl_cmd *cmd)
 {
-	struct cxl_cmd_identify *id =
-			(struct cxl_cmd_identify *)cmd->send_cmd->out.payload;
+	struct cxl_cmd_identify *c;
 
-	if (cmd->send_cmd->id != CXL_MEM_COMMAND_ID_IDENTIFY)
-		return -EINVAL;
-	if (cmd->status < 0)
-		return cmd->status;
-
-	return le64_to_cpu(id->partition_align);
+	c = cmd_to_identify(cmd);
+	if (!c)
+		return ULLONG_MAX;
+	return cxl_capacity_to_bytes(c->partition_align);
 }
 
 CXL_EXPORT unsigned int cxl_cmd_identify_get_label_size(struct cxl_cmd *cmd)
-- 
2.31.1