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Subject: [PATCH v2 03/10] cxl/mbox: Add SET_FEATURE mailbox command
Date:   Tue, 21 Nov 2023 18:18:36 +0800
Message-ID: <20231121101844.1161-4-shiju.jose@huawei.com>
In-Reply-To: <20231121101844.1161-1-shiju.jose@huawei.com>
References: <20231121101844.1161-1-shiju.jose@huawei.com>
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From: Shiju Jose <shiju.jose@huawei.com>

Add support for SET_FEATURE mailbox command.

CXL spec 3.0 section 8.2.9.6 describes optional device specific features.
CXL devices supports features with changeable attributes.
The settings of a feature can be optionally modified using Set Feature
command.

Signed-off-by: Shiju Jose <shiju.jose@huawei.com>
---
 drivers/cxl/core/mbox.c      | 15 +++++++++++++++
 drivers/cxl/cxlmem.h         | 27 +++++++++++++++++++++++++++
 include/uapi/linux/cxl_mem.h |  1 +
 3 files changed, 43 insertions(+)

diff --git a/drivers/cxl/core/mbox.c b/drivers/cxl/core/mbox.c
index 2675c616caec..d892b07446ca 100644
--- a/drivers/cxl/core/mbox.c
+++ b/drivers/cxl/core/mbox.c
@@ -65,6 +65,7 @@ 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_SUPPORTED_FEATURES, 0x8, CXL_VARIABLE_PAYLOAD, 0),
 	CXL_CMD(GET_FEATURE, 0x15, CXL_VARIABLE_PAYLOAD, 0),
+	CXL_CMD(SET_FEATURE, CXL_VARIABLE_PAYLOAD, 0, 0),
 };
 
 /*
@@ -1350,6 +1351,20 @@ int cxl_get_feature(struct cxl_memdev_state *mds,
 }
 EXPORT_SYMBOL_NS_GPL(cxl_get_feature, CXL);
 
+int cxl_set_feature(struct cxl_memdev_state *mds, void *feat_in, size_t size)
+{
+	struct cxl_mbox_cmd mbox_cmd;
+
+	mbox_cmd = (struct cxl_mbox_cmd) {
+		.opcode = CXL_MBOX_OP_SET_FEATURE,
+		.size_in = size,
+		.payload_in = feat_in,
+	};
+
+	return cxl_internal_send_cmd(mds, &mbox_cmd);
+}
+EXPORT_SYMBOL_NS_GPL(cxl_set_feature, CXL);
+
 int cxl_mem_get_poison(struct cxl_memdev *cxlmd, u64 offset, u64 len,
 		       struct cxl_region *cxlr)
 {
diff --git a/drivers/cxl/cxlmem.h b/drivers/cxl/cxlmem.h
index 92c1f2a44713..46131dcd0900 100644
--- a/drivers/cxl/cxlmem.h
+++ b/drivers/cxl/cxlmem.h
@@ -508,6 +508,7 @@ enum cxl_opcode {
 	CXL_MBOX_OP_GET_LOG		= 0x0401,
 	CXL_MBOX_OP_GET_SUPPORTED_FEATURES	= 0x0500,
 	CXL_MBOX_OP_GET_FEATURE		= 0x0501,
+	CXL_MBOX_OP_SET_FEATURE		= 0x0502,
 	CXL_MBOX_OP_IDENTIFY		= 0x4000,
 	CXL_MBOX_OP_GET_PARTITION_INFO	= 0x4100,
 	CXL_MBOX_OP_SET_PARTITION_INFO	= 0x4101,
@@ -817,6 +818,31 @@ struct cxl_mbox_get_feat_in {
 	u8 selection;
 }  __packed;
 
+/* Set Feature CXL 3.0 Spec 8.2.9.6.3 */
+/*
+ * Set Feature input payload
+ * CXL rev 3.0 section 8.2.9.6.3; Table 8-81
+ */
+/* Set Feature : Payload in flags */
+#define CXL_SET_FEAT_FLAG_DATA_TRANSFER_MASK	GENMASK(2, 0)
+enum cxl_set_feat_flag_data_transfer {
+	CXL_SET_FEAT_FLAG_FULL_DATA_TRANSFER = 0x0,
+	CXL_SET_FEAT_FLAG_INITIATE_DATA_TRANSFER = 0x1,
+	CXL_SET_FEAT_FLAG_CONTINUE_DATA_TRANSFER = 0x2,
+	CXL_SET_FEAT_FLAG_FINISH_DATA_TRANSFER = 0x3,
+	CXL_SET_FEAT_FLAG_ABORT_DATA_TRANSFER = 0x4,
+	CXL_SET_FEAT_FLAG_DATA_TRANSFER_MAX
+};
+#define CXL_SET_FEAT_FLAG_MOD_VALUE_SAVED_ACROSS_RESET	BIT(3)
+
+struct cxl_mbox_set_feat_in {
+	uuid_t uuid;
+	__le32 flags;
+	__le16 offset;
+	u8 version;
+	u8 rsvd[9];
+}  __packed;
+
 /* Get Poison List  CXL 3.0 Spec 8.2.9.8.4.1 */
 struct cxl_mbox_poison_in {
 	__le64 offset;
@@ -949,6 +975,7 @@ int cxl_get_supported_features(struct cxl_memdev_state *mds,
 			       void *feats_out);
 int cxl_get_feature(struct cxl_memdev_state *mds,
 		    struct cxl_mbox_get_feat_in *pi, void *feat_out);
+int cxl_set_feature(struct cxl_memdev_state *mds, void *feat_in, size_t size);
 int cxl_poison_state_init(struct cxl_memdev_state *mds);
 int cxl_mem_get_poison(struct cxl_memdev *cxlmd, u64 offset, u64 len,
 		       struct cxl_region *cxlr);
diff --git a/include/uapi/linux/cxl_mem.h b/include/uapi/linux/cxl_mem.h
index b20de60bfc71..8c89d323cc41 100644
--- a/include/uapi/linux/cxl_mem.h
+++ b/include/uapi/linux/cxl_mem.h
@@ -48,6 +48,7 @@
 	___DEPRECATED(GET_SCAN_MEDIA, "Get Scan Media Results"),          \
 	___C(GET_SUPPORTED_FEATURES, "Get Supported Features"),           \
 	___C(GET_FEATURE, "Get Feature"),                                 \
+	___C(SET_FEATURE, "Set Feature"),                                 \
 	___C(MAX, "invalid / last command")
 
 #define ___C(a, b) CXL_MEM_COMMAND_ID_##a
-- 
2.34.1