From: Shiju Jose <shiju.jose@xxxxxxxxxx> Add support for GET_FEATURE mailbox command. CXL spec 3.1 section 8.2.9.6 describes optional device specific features. The settings of a feature can be retrieved using Get Feature command. Signed-off-by: Shiju Jose <shiju.jose@xxxxxxxxxx> --- drivers/cxl/core/mbox.c | 37 +++++++++++++++++++++++++++++++++++++ drivers/cxl/cxlmem.h | 27 +++++++++++++++++++++++++++ 2 files changed, 64 insertions(+) diff --git a/drivers/cxl/core/mbox.c b/drivers/cxl/core/mbox.c index 9b9b1d26454e..b1eeed508459 100644 --- a/drivers/cxl/core/mbox.c +++ b/drivers/cxl/core/mbox.c @@ -1351,6 +1351,43 @@ int cxl_get_supported_features(struct cxl_memdev_state *mds, } EXPORT_SYMBOL_NS_GPL(cxl_get_supported_features, CXL); +size_t cxl_get_feature(struct cxl_memdev_state *mds, + const uuid_t feat_uuid, void *feat_out, + size_t feat_out_size, + enum cxl_get_feat_selection selection) +{ + size_t data_to_rd_size, size_out; + struct cxl_mbox_get_feat_in pi; + struct cxl_mbox_cmd mbox_cmd; + size_t data_rcvd_size = 0; + int rc; + + size_out = min(feat_out_size, mds->payload_size); + pi.uuid = feat_uuid; + pi.selection = selection; + do { + data_to_rd_size = min(feat_out_size - data_rcvd_size, mds->payload_size); + pi.offset = cpu_to_le16(data_rcvd_size); + pi.count = cpu_to_le16(data_to_rd_size); + + mbox_cmd = (struct cxl_mbox_cmd) { + .opcode = CXL_MBOX_OP_GET_FEATURE, + .size_in = sizeof(pi), + .payload_in = &pi, + .size_out = size_out, + .payload_out = feat_out + data_rcvd_size, + .min_out = data_to_rd_size, + }; + rc = cxl_internal_send_cmd(mds, &mbox_cmd); + if (rc < 0 || mbox_cmd.size_out == 0) + return 0; + data_rcvd_size += mbox_cmd.size_out; + } while (data_rcvd_size < feat_out_size); + + return data_rcvd_size; +} +EXPORT_SYMBOL_NS_GPL(cxl_get_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 b0e1565b9d2e..25698a6fbe66 100644 --- a/drivers/cxl/cxlmem.h +++ b/drivers/cxl/cxlmem.h @@ -531,6 +531,7 @@ enum cxl_opcode { CXL_MBOX_OP_CLEAR_LOG = 0x0403, CXL_MBOX_OP_GET_SUP_LOG_SUBLIST = 0x0405, CXL_MBOX_OP_GET_SUPPORTED_FEATURES = 0x0500, + CXL_MBOX_OP_GET_FEATURE = 0x0501, CXL_MBOX_OP_IDENTIFY = 0x4000, CXL_MBOX_OP_GET_PARTITION_INFO = 0x4100, CXL_MBOX_OP_SET_PARTITION_INFO = 0x4101, @@ -757,6 +758,28 @@ struct cxl_mbox_get_supp_feats_out { struct cxl_mbox_supp_feat_entry feat_entries[]; } __packed; +/* + * Get Feature CXL 3.1 Spec 8.2.9.6.2 + */ + +/* + * Get Feature input payload + * CXL rev 3.1 section 8.2.9.6.2 Table 8-99 + */ +enum cxl_get_feat_selection { + CXL_GET_FEAT_SEL_CURRENT_VALUE, + CXL_GET_FEAT_SEL_DEFAULT_VALUE, + CXL_GET_FEAT_SEL_SAVED_VALUE, + CXL_GET_FEAT_SEL_MAX +}; + +struct cxl_mbox_get_feat_in { + uuid_t uuid; + __le16 offset; + __le16 count; + u8 selection; +} __packed; + /* Get Poison List CXL 3.0 Spec 8.2.9.8.4.1 */ struct cxl_mbox_poison_in { __le64 offset; @@ -891,6 +914,10 @@ int cxl_set_timestamp(struct cxl_memdev_state *mds); int cxl_get_supported_features(struct cxl_memdev_state *mds, u32 count, u16 start_index, struct cxl_mbox_get_supp_feats_out *feats_out); +size_t cxl_get_feature(struct cxl_memdev_state *mds, + const uuid_t feat_uuid, void *feat_out, + size_t feat_out_size, + enum cxl_get_feat_selection selection); 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); -- 2.34.1