On 11/1/24 2:17 AM, shiju.jose@xxxxxxxxxx wrote:
> From: Shiju Jose <shiju.jose@xxxxxxxxxx>
>
> Add support for PERFORM_MAINTENANCE mailbox command.
>
> CXL spec 3.1 section 8.2.9.7.1 describes the Perform Maintenance command.
> This command requests the device to execute the maintenance operation
> specified by the maintenance operation class and the maintenance operation
> subclass.
>
> Reviewed-by: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>
> Signed-off-by: Shiju Jose <shiju.jose@xxxxxxxxxx>
Reviewed-by: Dave Jiang <dave.jiang@xxxxxxxxx>
> ---
> drivers/cxl/core/mbox.c | 35 +++++++++++++++++++++++++++++++++++
> drivers/cxl/cxlmem.h | 17 +++++++++++++++++
> 2 files changed, 52 insertions(+)
>
> diff --git a/drivers/cxl/core/mbox.c b/drivers/cxl/core/mbox.c
> index 4b9e62de164b..381cf9d61c85 100644
> --- a/drivers/cxl/core/mbox.c
> +++ b/drivers/cxl/core/mbox.c
> @@ -1084,6 +1084,41 @@ int cxl_set_feature(struct cxl_memdev_state *mds,
> }
> EXPORT_SYMBOL_NS_GPL(cxl_set_feature, CXL);
>
> +int cxl_do_maintenance(struct cxl_memdev_state *mds,
> + u8 class, u8 subclass,
> + void *data_in, size_t data_in_size)
> +{
> + struct cxl_mailbox *cxl_mbox = &mds->cxlds.cxl_mbox;
> + struct cxl_memdev_maintenance_pi {
> + struct cxl_mbox_do_maintenance_hdr hdr;
> + u8 data[];
> + } __packed;
> + struct cxl_mbox_cmd mbox_cmd;
> + size_t hdr_size;
> +
> + struct cxl_memdev_maintenance_pi *pi __free(kfree) =
> + kmalloc(cxl_mbox->payload_size, GFP_KERNEL);
> + pi->hdr.op_class = class;
> + pi->hdr.op_subclass = subclass;
> + hdr_size = sizeof(pi->hdr);
> + /*
> + * Check minimum mbox payload size is available for
> + * the maintenance data transfer.
> + */
> + if (hdr_size + data_in_size > cxl_mbox->payload_size)
> + return -ENOMEM;
> +
> + memcpy(pi->data, data_in, data_in_size);
> + mbox_cmd = (struct cxl_mbox_cmd) {
> + .opcode = CXL_MBOX_OP_DO_MAINTENANCE,
> + .size_in = hdr_size + data_in_size,
> + .payload_in = pi,
> + };
> +
> + return cxl_internal_send_cmd(cxl_mbox, &mbox_cmd);
> +}
> +EXPORT_SYMBOL_NS_GPL(cxl_do_maintenance, CXL);
> +
> /**
> * cxl_enumerate_cmds() - Enumerate commands for a device.
> * @mds: The driver data for the operation
> diff --git a/drivers/cxl/cxlmem.h b/drivers/cxl/cxlmem.h
> index 9259c5d70a65..28290f7c89f7 100644
> --- a/drivers/cxl/cxlmem.h
> +++ b/drivers/cxl/cxlmem.h
> @@ -533,6 +533,7 @@ enum cxl_opcode {
> CXL_MBOX_OP_GET_SUPPORTED_FEATURES = 0x0500,
> CXL_MBOX_OP_GET_FEATURE = 0x0501,
> CXL_MBOX_OP_SET_FEATURE = 0x0502,
> + CXL_MBOX_OP_DO_MAINTENANCE = 0x0600,
> CXL_MBOX_OP_IDENTIFY = 0x4000,
> CXL_MBOX_OP_GET_PARTITION_INFO = 0x4100,
> CXL_MBOX_OP_SET_PARTITION_INFO = 0x4101,
> @@ -909,6 +910,19 @@ struct cxl_mbox_set_feat_hdr {
> u8 rsvd[9];
> } __packed;
>
> +/*
> + * Perform Maintenance CXL 3.1 Spec 8.2.9.7.1
> + */
> +
> +/*
> + * Perform Maintenance input payload
> + * CXL rev 3.1 section 8.2.9.7.1 Table 8-102
> + */
> +struct cxl_mbox_do_maintenance_hdr {
> + u8 op_class;
> + u8 op_subclass;
> +} __packed;
> +
> int cxl_internal_send_cmd(struct cxl_mailbox *cxl_mbox,
> struct cxl_mbox_cmd *cmd);
> int cxl_dev_state_identify(struct cxl_memdev_state *mds);
> @@ -986,4 +1000,7 @@ int cxl_set_feature(struct cxl_memdev_state *mds,
> const uuid_t feat_uuid, u8 feat_version,
> void *feat_data, size_t feat_data_size,
> u8 feat_flag);
> +int cxl_do_maintenance(struct cxl_memdev_state *mds,
> + u8 class, u8 subclass,
> + void *data_in, size_t data_in_size);
> #endif /* __CXL_MEM_H__ */
