From: Shiju Jose <shiju.jose@xxxxxxxxxx>
Add support for SET_FEATURE mailbox command.
CXL spec 3.1 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.
CXL spec 3.1 section 8.2.9.6.3 describes Set Feature command.
Signed-off-by: Shiju Jose <shiju.jose@xxxxxxxxxx>
Signed-off-by: Dave Jiang <dave.jiang@xxxxxxxxx>
---
drivers/cxl/core/features.c | 92 +++++++++++++++++++++++++++++++++++++
include/cxl/features.h | 32 +++++++++++++
2 files changed, 124 insertions(+)
diff --git a/drivers/cxl/core/features.c b/drivers/cxl/core/features.c
index ab9386b53a95..932e82b52f90 100644
--- a/drivers/cxl/core/features.c
+++ b/drivers/cxl/core/features.c
@@ -171,3 +171,95 @@ size_t cxl_get_feature(struct cxl_features *features, const uuid_t feat_uuid,
return data_rcvd_size;
}
EXPORT_SYMBOL_NS_GPL(cxl_get_feature, "CXL");
+
+/*
+ * FEAT_DATA_MIN_PAYLOAD_SIZE - min extra number of bytes should be
+ * available in the mailbox for storing the actual feature data so that
+ * the feature data transfer would work as expected.
+ */
+#define FEAT_DATA_MIN_PAYLOAD_SIZE 10
+int cxl_set_feature(struct cxl_features *features,
+ const uuid_t feat_uuid, u8 feat_version,
+ void *feat_data, size_t feat_data_size,
+ u32 feat_flag, u16 offset, u16 *return_code)
+{
+ struct cxl_memdev_set_feat_pi {
+ struct cxl_mbox_set_feat_hdr hdr;
+ u8 feat_data[];
+ } __packed;
+ size_t data_in_size, data_sent_size = 0;
+ struct cxl_features_state *cfs;
+ struct cxl_mbox_cmd mbox_cmd;
+ struct cxl_mailbox *cxl_mbox;
+ size_t hdr_size;
+ int rc = 0;
+
+ if (return_code)
+ *return_code = CXL_MBOX_CMD_RC_INPUT;
+
+ cfs = dev_get_drvdata(&features->dev);
+ if (!cfs)
+ return -EOPNOTSUPP;
+
+ if (!cxl_feature_enabled(cfs, CXL_MBOX_OP_SET_FEATURE))
+ return -EOPNOTSUPP;
+
+ cxl_mbox = features->cxl_mbox;
+
+ struct cxl_memdev_set_feat_pi *pi __free(kfree) =
+ kmalloc(cxl_mbox->payload_size, GFP_KERNEL);
+ pi->hdr.uuid = feat_uuid;
+ pi->hdr.version = feat_version;
+ feat_flag &= ~CXL_SET_FEAT_FLAG_DATA_TRANSFER_MASK;
+ feat_flag |= CXL_SET_FEAT_FLAG_DATA_SAVED_ACROSS_RESET;
+ hdr_size = sizeof(pi->hdr);
+ /*
+ * Check minimum mbox payload size is available for
+ * the feature data transfer.
+ */
+ if (hdr_size + FEAT_DATA_MIN_PAYLOAD_SIZE > cxl_mbox->payload_size)
+ return -ENOMEM;
+
+ if ((hdr_size + feat_data_size) <= cxl_mbox->payload_size) {
+ pi->hdr.flags = cpu_to_le32(feat_flag |
+ CXL_SET_FEAT_FLAG_FULL_DATA_TRANSFER);
+ data_in_size = feat_data_size;
+ } else {
+ pi->hdr.flags = cpu_to_le32(feat_flag |
+ CXL_SET_FEAT_FLAG_INITIATE_DATA_TRANSFER);
+ data_in_size = cxl_mbox->payload_size - hdr_size;
+ }
+
+ do {
+ pi->hdr.offset = cpu_to_le16(offset + data_sent_size);
+ memcpy(pi->feat_data, feat_data + data_sent_size, data_in_size);
+ mbox_cmd = (struct cxl_mbox_cmd) {
+ .opcode = CXL_MBOX_OP_SET_FEATURE,
+ .size_in = hdr_size + data_in_size,
+ .payload_in = pi,
+ };
+ rc = cxl_internal_send_cmd(cxl_mbox, &mbox_cmd);
+ if (rc < 0) {
+ if (return_code)
+ *return_code = mbox_cmd.return_code;
+ return rc;
+ }
+
+ data_sent_size += data_in_size;
+ if (data_sent_size >= feat_data_size) {
+ if (return_code)
+ *return_code = CXL_MBOX_CMD_RC_SUCCESS;
+ return 0;
+ }
+
+ if ((feat_data_size - data_sent_size) <= (cxl_mbox->payload_size - hdr_size)) {
+ data_in_size = feat_data_size - data_sent_size;
+ pi->hdr.flags = cpu_to_le32(feat_flag |
+ CXL_SET_FEAT_FLAG_FINISH_DATA_TRANSFER);
+ } else {
+ pi->hdr.flags = cpu_to_le32(feat_flag |
+ CXL_SET_FEAT_FLAG_CONTINUE_DATA_TRANSFER);
+ }
+ } while (true);
+}
+EXPORT_SYMBOL_NS_GPL(cxl_set_feature, "CXL");
diff --git a/include/cxl/features.h b/include/cxl/features.h
index 582fb85da5b9..41d3602b186c 100644
--- a/include/cxl/features.h
+++ b/include/cxl/features.h
@@ -75,6 +75,35 @@ struct cxl_mbox_get_feat_in {
u8 selection;
} __packed;
+/*
+ * Set Feature CXL 3.1 Spec 8.2.9.6.3
+ */
+
+/*
+ * Set Feature input payload
+ * CXL rev 3.1 section 8.2.9.6.3 Table 8-101
+ */
+/* 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,
+ CXL_SET_FEAT_FLAG_INITIATE_DATA_TRANSFER,
+ CXL_SET_FEAT_FLAG_CONTINUE_DATA_TRANSFER,
+ CXL_SET_FEAT_FLAG_FINISH_DATA_TRANSFER,
+ CXL_SET_FEAT_FLAG_ABORT_DATA_TRANSFER,
+ CXL_SET_FEAT_FLAG_DATA_TRANSFER_MAX
+};
+
+#define CXL_SET_FEAT_FLAG_DATA_SAVED_ACROSS_RESET BIT(3)
+
+struct cxl_mbox_set_feat_hdr {
+ uuid_t uuid;
+ __le32 flags;
+ __le16 offset;
+ u8 version;
+ u8 rsvd[9];
+} __packed;
+
bool cxl_feature_enabled(struct cxl_features_state *cfs, u16 opcode);
struct cxl_features *cxl_features_alloc(struct cxl_mailbox *cxl_mbox,
struct device *parent);
@@ -85,5 +114,8 @@ size_t cxl_get_feature(struct cxl_features *features, const uuid_t feat_uuid,
enum cxl_get_feat_selection selection,
void *feat_out, size_t feat_out_size, u16 offset,
u16 *return_code);
+int cxl_set_feature(struct cxl_features *features, const uuid_t feat_uuid,
+ u8 feat_version, void *feat_data, size_t feat_data_size,
+ u32 feat_flag, u16 offset, u16 *return_code);
#endif
--
2.43.0
