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    Subject[RFC PATCH v6 03/12] cxl/mbox: Add SET_FEATURE mailbox command
    Date
    From: Shiju Jose <shiju.jose@huawei.com>

    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.

    Signed-off-by: Shiju Jose <shiju.jose@huawei.com>
    ---
    drivers/cxl/core/mbox.c | 14 ++++++++++++++
    drivers/cxl/cxlmem.h | 27 +++++++++++++++++++++++++++
    2 files changed, 41 insertions(+)

    diff --git a/drivers/cxl/core/mbox.c b/drivers/cxl/core/mbox.c
    index f43189b6859a..056576862b8a 100644
    --- a/drivers/cxl/core/mbox.c
    +++ b/drivers/cxl/core/mbox.c
    @@ -1335,6 +1335,20 @@ 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 eaecc3234cfd..2223ef3d3140 100644
    --- a/drivers/cxl/cxlmem.h
    +++ b/drivers/cxl/cxlmem.h
    @@ -531,6 +531,7 @@ 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,
    @@ -778,6 +779,31 @@ 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_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;
    @@ -914,6 +940,7 @@ 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);
    --
    2.34.1

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