linux-kernel - [PATCH v17 07/18] cxl: Add Get Feature command support for user submission

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Message-ID: <20241122180416.1932-8-shiju.jose@huawei.com>
Date: Fri, 22 Nov 2024 18:04:04 +0000
From: <shiju.jose@...wei.com>
To: <linux-edac@...r.kernel.org>, <linux-cxl@...r.kernel.org>,
	<linux-acpi@...r.kernel.org>, <linux-mm@...ck.org>,
	<linux-kernel@...r.kernel.org>
CC: <bp@...en8.de>, <tony.luck@...el.com>, <rafael@...nel.org>,
	<lenb@...nel.org>, <mchehab@...nel.org>, <dan.j.williams@...el.com>,
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Subject: [PATCH v17 07/18] cxl: Add Get Feature command support for user submission

From: Dave Jiang <dave.jiang@...el.com>

Add enumeration of Get Feature mailbox command for the kernel to recognize
the command being passed in from user space.

CXL spec r3.1 8.2.9.6.2 Get Feature (Opcode 0501h)

The feature requested is identified by specific UUID.

Signed-off-by: Dave Jiang <dave.jiang@...el.com>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
Signed-off-by: Shiju Jose <shiju.jose@...wei.com>
---
 drivers/cxl/core/mbox.c      | 1 +
 include/uapi/linux/cxl_mem.h | 1 +
 2 files changed, 2 insertions(+)

diff --git a/drivers/cxl/core/mbox.c b/drivers/cxl/core/mbox.c
index f96648c7a0c6..37764d3d470d 100644
--- a/drivers/cxl/core/mbox.c
+++ b/drivers/cxl/core/mbox.c
@@ -68,6 +68,7 @@ static struct cxl_mem_command cxl_mem_commands[CXL_MEM_COMMAND_ID_MAX] = {
 	CXL_CMD(GET_SCAN_MEDIA_CAPS, 0x10, 0x4, 0),
 	CXL_CMD(GET_TIMESTAMP, 0, 0x8, 0),
 	CXL_CMD(GET_SUPPORTED_FEATURES, 0x8, CXL_VARIABLE_PAYLOAD, 0),
+	CXL_CMD(GET_FEATURE, 0x15, CXL_VARIABLE_PAYLOAD, 0),
 };
 
 /*
diff --git a/include/uapi/linux/cxl_mem.h b/include/uapi/linux/cxl_mem.h
index bd2535962f70..90dcb9723997 100644
--- a/include/uapi/linux/cxl_mem.h
+++ b/include/uapi/linux/cxl_mem.h
@@ -51,6 +51,7 @@
 	___C(CLEAR_LOG, "Clear Log"),					  \
 	___C(GET_SUP_LOG_SUBLIST, "Get Supported Logs Sub-List"),	  \
 	___C(GET_SUPPORTED_FEATURES, "Get Supported Features"),		  \
+	___C(GET_FEATURE, "Get Feature"),				  \
 	___C(MAX, "invalid / last command")
 
 #define ___C(a, b) CXL_MEM_COMMAND_ID_##a
-- 
2.43.0