RE: [RFC PATCH 1/6] cxl/mbox: Add GET_SUPPORTED_FEATURES, GET_FEATURE and SET_FEATURE mailbox commands

From: Shiju Jose
Date: Thu Nov 16 2023 - 04:26:00 EST

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Hi Dave,

Thanks for the feedbacks.

>-----Original Message-----
>From: Dave Jiang <dave.jiang@xxxxxxxxx>
>Sent: 15 November 2023 18:21
>To: Shiju Jose <shiju.jose@xxxxxxxxxx>; linux-cxl@xxxxxxxxxxxxxxx
>Cc: Jonathan Cameron <jonathan.cameron@xxxxxxxxxx>;
>Vilas.Sridharan@xxxxxxx; leo.duran@xxxxxxx; Yazen.Ghannam@xxxxxxx;
>rientjes@xxxxxxxxxx; jiaqiyan@xxxxxxxxxx; tony.luck@xxxxxxxxx;
>Jon.Grimm@xxxxxxx; dave.hansen@xxxxxxxxxxxxxxx; linux-
>acpi@xxxxxxxxxxxxxxx; linux-mm@xxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx;
>rafael@xxxxxxxxxx; lenb@xxxxxxxxxx; naoya.horiguchi@xxxxxxx;
>james.morse@xxxxxxx; david@xxxxxxxxxx; jthoughton@xxxxxxxxxx;
>somasundaram.a@xxxxxxx; erdemaktas@xxxxxxxxxx;
>"pgonda@pgonda"@google.com; duenwen@xxxxxxxxxx;
>mike.malvestuto@xxxxxxxxx; gthelen@xxxxxxxxxx; tanxiaofei
><tanxiaofei@xxxxxxxxxx>; Zengtao (B) <prime.zeng@xxxxxxxxxxxxx>;
>kangkang.shen@xxxxxxxxxxxxx; wanghuiqiang <wanghuiqiang@xxxxxxxxxx>;
>Linuxarm <linuxarm@xxxxxxxxxx>
>Subject: Re: [RFC PATCH 1/6] cxl/mbox: Add GET_SUPPORTED_FEATURES,
>GET_FEATURE and SET_FEATURE mailbox commands
>
>
>
>On 11/14/23 05:56, shiju.jose@xxxxxxxxxx wrote:
>> From: Shiju Jose <shiju.jose@xxxxxxxxxx>
>>
>> Add support for GET_SUPPORTED_FEATURES, GET_FEATURE and
>SET_FEATURE
>> mailbox commands.
>>
>> CXL spec 3.0 section 8.2.9.6 describes optional device specific features.
>> CXL devices supports features with changeable attributes.
>> Get Supported Features retrieves the list of supported device specific
>> features. The settings of a feature can be retrieved using Get Feature
>> and optionally modified using Set Feature.
>
>Maybe split this patch out into 3 for each of the individual commands you are
>enabling. That'll make git bisect easier for debugging.
Sure. I will do this.

>
>A few nits but the rest LGTM.
>
>>
>> Signed-off-by: Shiju Jose <shiju.jose@xxxxxxxxxx>
>> ---
>> drivers/cxl/core/mbox.c | 74 ++++++++++++++++++++++++++++
>> drivers/cxl/cxlmem.h | 95 ++++++++++++++++++++++++++++++++++++
>> include/uapi/linux/cxl_mem.h | 3 ++
>> 3 files changed, 172 insertions(+)
>>
>> diff --git a/drivers/cxl/core/mbox.c b/drivers/cxl/core/mbox.c index
>> 36270dcfb42e..2a6d8ab927bd 100644
>> --- a/drivers/cxl/core/mbox.c
>> +++ b/drivers/cxl/core/mbox.c
>> @@ -63,6 +63,9 @@ static struct cxl_mem_command
>cxl_mem_commands[CXL_MEM_COMMAND_ID_MAX] = {
>> CXL_CMD(GET_SHUTDOWN_STATE, 0, 0x1, 0),
>> CXL_CMD(SET_SHUTDOWN_STATE, 0x1, 0, 0),
>> 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),
>> };
>>
>> /*
>> @@ -1303,6 +1306,77 @@ int cxl_set_timestamp(struct cxl_memdev_state
>> *mds) } EXPORT_SYMBOL_NS_GPL(cxl_set_timestamp, CXL);
>>
>> +struct cxl_mbox_get_supp_feats_out *cxl_get_supported_features(struct
>cxl_memdev_state *mds,
>> + struct
>cxl_mbox_get_supp_feats_in *pi) {
>> + int rc;
>> + struct cxl_mbox_cmd mbox_cmd;
>> + struct cxl_mbox_get_supp_feats_out *feats_out;
>
>reverse xmas tree declarations
Sure. Will change.

>
>> +
>> + feats_out = kvmalloc(pi->count, GFP_KERNEL);
>> + if (!feats_out)
>> + return ERR_PTR(-ENOMEM);
>> +
>> + mbox_cmd = (struct cxl_mbox_cmd) {
>> + .opcode = CXL_MBOX_OP_GET_SUPPORTED_FEATURES,
>> + .size_in = sizeof(*pi),
>> + .payload_in = pi,
>> + .size_out = pi->count,
>> + .payload_out = feats_out,
>> + .min_out = sizeof(struct cxl_mbox_get_supp_feats_out),
>> + };
>> + rc = cxl_internal_send_cmd(mds, &mbox_cmd);
>> + if (rc < 0) {
>> + kvfree(feats_out);
>> + return ERR_PTR(rc);
>> + }
>> +
>> + return feats_out;
>> +}
>> +EXPORT_SYMBOL_NS_GPL(cxl_get_supported_features, CXL);
>> +
>> +void *cxl_get_feature(struct cxl_memdev_state *mds, struct
>> +cxl_mbox_get_feat_in *pi) {
>> + int rc;
>> + void *feat_out;
>> + struct cxl_mbox_cmd mbox_cmd;
>
>reverse xmas tree declarations
Will change.

>
>
>> +
>> + feat_out = kvmalloc(pi->count, GFP_KERNEL);
>> + if (!feat_out)
>> + return ERR_PTR(-ENOMEM);
>> +
>> + mbox_cmd = (struct cxl_mbox_cmd) {
>> + .opcode = CXL_MBOX_OP_GET_FEATURE,
>> + .size_in = sizeof(*pi),
>> + .payload_in = pi,
>> + .size_out = pi->count,
>> + .payload_out = feat_out,
>> + .min_out = pi->count,
>> + };
>> + rc = cxl_internal_send_cmd(mds, &mbox_cmd);
>> + if (rc < 0) {
>> + kvfree(feat_out);
>> + return ERR_PTR(rc);
>> + }
>> +
>> + return feat_out;
>> +}
>> +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
>> a2fcbca253f3..fdac686560d4 100644
>> --- a/drivers/cxl/cxlmem.h
>> +++ b/drivers/cxl/cxlmem.h
>> @@ -506,6 +506,9 @@ enum cxl_opcode {
>> CXL_MBOX_OP_SET_TIMESTAMP = 0x0301,
>> CXL_MBOX_OP_GET_SUPPORTED_LOGS = 0x0400,
>> 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,
>> @@ -740,6 +743,94 @@ struct cxl_mbox_set_timestamp_in {
>>
>> } __packed;
>>
>> +/* Get Supported Features CXL 3.0 Spec 8.2.9.6.1 */
>> +/*
>> + * Get Supported Features input payload
>> + * CXL rev 3.0 section 8.2.9.6.1; Table 8-75 */ struct
>> +cxl_mbox_get_supp_feats_in {
>> + __le32 count;
>> + __le16 start_index;
>> + u16 reserved;
>> +} __packed;
>> +
>> +/*
>> + * Get Supported Features Supported Feature Entry
>> + * CXL rev 3.0 section 8.2.9.6.1; Table 8-77 */
>> +/* Supported Feature Entry : Payload out attribute flags */
>> +#define CXL_FEAT_ENTRY_FLAG_CHANGABLE BIT(0)
>> +#define CXL_FEAT_ENTRY_FLAG_DEEPEST_RESET_PERSISTENCE_MASK
> GENMASK(3, 1)
>> +#define CXL_FEAT_ENTRY_FLAG_DEEPEST_RESET_PERSISTENCE_NONE
> 0x0
>> +#define CXL_FEAT_ENTRY_FLAG_DEEPEST_RESET_PERSISTENCE_CXL_RESET
> 0x1
>> +#define CXL_FEAT_ENTRY_FLAG_DEEPEST_RESET_PERSISTENCE_HOT_RESET
> 0x2
>> +#define
>CXL_FEAT_ENTRY_FLAG_DEEPEST_RESET_PERSISTENCE_WARM_RESET 0x3
>> +#define
>CXL_FEAT_ENTRY_FLAG_DEEPEST_RESET_PERSISTENCE_COLD_RESET 0x4
>
>I think you can declare the flags as enums?
Sure. Will check.

>
>> +#define CXL_FEAT_ENTRY_FLAG_PERSISTENCE_ACROSS_FW_UPDATE_MASK
> BIT(4)
>> +#define
>CXL_FEAT_ENTRY_FLAG_PERSISTENCE_DEFAULT_SEL_SUPPORT_MASK BIT(5)
>> +#define CXL_FEAT_ENTRY_FLAG_PERSISTENCE_SAVED_SEL_SUPPORT_MASK
> BIT(6)
>> +
>> +struct cxl_mbox_supp_feat_entry {
>> + uuid_t uuid;
>> + __le16 feat_index;
>> + __le16 get_feat_size;
>> + __le16 set_feat_size;
>> + __le32 attrb_flags;
>> + u8 get_feat_version;
>> + u8 set_feat_version;
>> + __le16 set_feat_effects;
>> + u8 rsvd[18];
>> +} __packed;
>> +
>> +/*
>> + * Get Supported Features output payload
>> + * CXL rev 3.0 section 8.2.9.6.1; Table 8-76 */ struct
>> +cxl_mbox_get_supp_feats_out {
>> + __le16 entries;
>> + __le16 nsuppfeats_dev;
>> + u32 reserved;
>> + struct cxl_mbox_supp_feat_entry feat_entries[]; } __packed;
>> +
>> +/* Get Feature CXL 3.0 Spec 8.2.9.6.2 */
>> +/*
>> + * Get Feature input payload
>> + * CXL rev 3.0 section 8.2.9.6.2; Table 8-79 */
>> +/* Get Feature : Payload in selection */
>> +#define CXL_GET_FEAT_CURRENT_VALUE 0x00
>> +#define CXL_GET_FEAT_DEFAULT_VALUE 0x01
>> +#define CXL_GET_FEAT_SAVED_VALUE 0x02
>> +
>> +struct cxl_mbox_get_feat_in {
>> + uuid_t uuid;
>> + __le16 offset;
>> + __le16 count;
>> + 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_ACTION_MASK GENMASK(2, 0)
>> +#define CXL_SET_FEAT_FLAG_ACTION_FULL_DATA_TRANSFER 0x0
>> +#define CXL_SET_FEAT_FLAG_ACTION_INITIATE_DATA_TRANSFER 0x1
>> +#define CXL_SET_FEAT_FLAG_ACTION_CONTINUE_DATA_TRANSFER 0x2
>> +#define CXL_SET_FEAT_FLAG_ACTION_FINISH_DATA_TRANSFER 0x3
>> +#define CXL_SET_FEAT_FLAG_ACTION_ABORT_DATA_TRANSFER 0x4
>> +#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;
>> @@ -867,6 +958,10 @@ void clear_exclusive_cxl_commands(struct
>cxl_memdev_state *mds,
>> unsigned long *cmds);
>> void cxl_mem_get_event_records(struct cxl_memdev_state *mds, u32
>> status); int cxl_set_timestamp(struct cxl_memdev_state *mds);
>> +struct cxl_mbox_get_supp_feats_out *cxl_get_supported_features(struct
>cxl_memdev_state *mds,
>> + struct
>cxl_mbox_get_supp_feats_in *pi); void
>> +*cxl_get_feature(struct cxl_memdev_state *mds, struct
>> +cxl_mbox_get_feat_in *pi); 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 14bc6e742148..8c89d323cc41 100644
>> --- a/include/uapi/linux/cxl_mem.h
>> +++ b/include/uapi/linux/cxl_mem.h
>> @@ -46,6 +46,9 @@
>> ___C(GET_SCAN_MEDIA_CAPS, "Get Scan Media Capabilities"), \
>> ___DEPRECATED(SCAN_MEDIA, "Scan Media"), \
>> ___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

Thanks,
Shiju

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