cxl: Add Support for Get Timestamp

Add the call to the UAPI such that userspace may corelate the
timestamps from the device log with system wall time, if, for
example there's any sort of inaccuracy or skew in the device.

Signed-off-by: Davidlohr Bueso <dave@stgolabs.net>
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Link: https://lore.kernel.org/r/20230829152014.15452-1-dave@stgolabs.net
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

diff --git a/drivers/cxl/core/mbox.c b/drivers/cxl/core/mbox.c
index 36270dc..b86dbd2 100644 (file)
--- a/drivers/cxl/core/mbox.c
+++ b/drivers/cxl/core/mbox.c
@@ -63,6 +63,7 @@ static struct cxl_mem_command cxl_mem_commands[CXL_MEM_COMMAND_ID_MAX] = {
        CXL_CMD(GET_SHUTDOWN_STATE, 0, 0x1, 0),
        CXL_CMD(SET_SHUTDOWN_STATE, 0x1, 0, 0),
        CXL_CMD(GET_SCAN_MEDIA_CAPS, 0x10, 0x4, 0),
+       CXL_CMD(GET_TIMESTAMP, 0, 0x8, 0),
 };
 
 /*

diff --git a/drivers/cxl/cxlmem.h b/drivers/cxl/cxlmem.h
index a2fcbca..6a6bece 100644 (file)
--- a/drivers/cxl/cxlmem.h
+++ b/drivers/cxl/cxlmem.h
@@ -503,6 +503,7 @@ enum cxl_opcode {
        CXL_MBOX_OP_GET_FW_INFO         = 0x0200,
        CXL_MBOX_OP_TRANSFER_FW         = 0x0201,
        CXL_MBOX_OP_ACTIVATE_FW         = 0x0202,
+       CXL_MBOX_OP_GET_TIMESTAMP       = 0x0300,
        CXL_MBOX_OP_SET_TIMESTAMP       = 0x0301,
        CXL_MBOX_OP_GET_SUPPORTED_LOGS  = 0x0400,
        CXL_MBOX_OP_GET_LOG             = 0x0401,

diff --git a/include/uapi/linux/cxl_mem.h b/include/uapi/linux/cxl_mem.h
index 14bc6e7..42066f4 100644 (file)
--- a/include/uapi/linux/cxl_mem.h
+++ b/include/uapi/linux/cxl_mem.h
@@ -46,6 +46,7 @@
        ___C(GET_SCAN_MEDIA_CAPS, "Get Scan Media Capabilities"),         \
        ___DEPRECATED(SCAN_MEDIA, "Scan Media"),                          \
        ___DEPRECATED(GET_SCAN_MEDIA, "Get Scan Media Results"),          \
+       ___C(GET_TIMESTAMP, "Get Timestamp"),                             \
        ___C(MAX, "invalid / last command")
 
 #define ___C(a, b) CXL_MEM_COMMAND_ID_##a