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Message-ID: <ZvrYzavk1UrNRBnT@fan>
Date: Mon, 30 Sep 2024 09:58:53 -0700
From: Fan Ni <nifan.cxl@...il.com>
To: shiju.jose@...wei.com
Cc: linux-edac@...r.kernel.org, linux-cxl@...r.kernel.org,
linux-acpi@...r.kernel.org, linux-mm@...ck.org,
linux-kernel@...r.kernel.org, bp@...en8.de, tony.luck@...el.com,
rafael@...nel.org, lenb@...nel.org, mchehab@...nel.org,
dan.j.williams@...el.com, dave@...olabs.net,
jonathan.cameron@...wei.com, dave.jiang@...el.com,
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ira.weiny@...el.com, david@...hat.com, Vilas.Sridharan@....com,
leo.duran@....com, Yazen.Ghannam@....com, rientjes@...gle.com,
jiaqiyan@...gle.com, Jon.Grimm@....com, dave.hansen@...ux.intel.com,
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wschwartz@...erecomputing.com, dferguson@...erecomputing.com,
wbs@...amperecomputing.com, nifan.cxl@...il.com, jgroves@...ron.com,
vsalve@...ron.com, tanxiaofei@...wei.com, prime.zeng@...ilicon.com,
roberto.sassu@...wei.com, kangkang.shen@...urewei.com,
wanghuiqiang@...wei.com, linuxarm@...wei.com
Subject: Re: [PATCH v12 09/17] cxl/mbox: Add SET_FEATURE mailbox command
On Wed, Sep 11, 2024 at 10:04:38AM +0100, shiju.jose@...wei.com wrote:
> From: Shiju Jose <shiju.jose@...wei.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.
s/supports/support/
Fan
> 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@...wei.com>
> ---
> drivers/cxl/core/mbox.c | 73 +++++++++++++++++++++++++++++++++++++++++
> drivers/cxl/cxlmem.h | 34 +++++++++++++++++++
> 2 files changed, 107 insertions(+)
>
> diff --git a/drivers/cxl/core/mbox.c b/drivers/cxl/core/mbox.c
> index 3dfe411c6556..806b1c8087b0 100644
> --- a/drivers/cxl/core/mbox.c
> +++ b/drivers/cxl/core/mbox.c
> @@ -1006,6 +1006,79 @@ size_t cxl_get_feature(struct cxl_dev_state *cxlds, const uuid_t feat_uuid,
> }
> 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_dev_state *cxlds,
> + const uuid_t feat_uuid, u8 feat_version,
> + void *feat_data, size_t feat_data_size,
> + u8 feat_flag)
> +{
> + struct cxl_mailbox *cxl_mbox = &cxlds->cxl_mbox;
> + 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_mbox_cmd mbox_cmd;
> + size_t hdr_size;
> + int rc = 0;
> +
> + 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(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)
> + return rc;
> +
> + data_sent_size += data_in_size;
> + if (data_sent_size >= feat_data_size)
> + 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);
> +
> /**
> * 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 57c9294bb7f3..b565a061a4e3 100644
> --- a/drivers/cxl/cxlmem.h
> +++ b/drivers/cxl/cxlmem.h
> @@ -488,6 +488,7 @@ enum cxl_opcode {
> CXL_MBOX_OP_GET_SUP_LOG_SUBLIST = 0x0405,
> 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,
> @@ -835,6 +836,35 @@ 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;
> +
> 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);
> @@ -901,4 +931,8 @@ int cxl_get_supported_feature_entry(struct cxl_dev_state *cxlds, const uuid_t *f
> size_t cxl_get_feature(struct cxl_dev_state *cxlds, const uuid_t feat_uuid,
> enum cxl_get_feat_selection selection,
> void *feat_out, size_t feat_out_size);
> +int cxl_set_feature(struct cxl_dev_state *cxlds,
> + const uuid_t feat_uuid, u8 feat_version,
> + void *feat_data, size_t feat_data_size,
> + u8 feat_flag);
> #endif /* __CXL_MEM_H__ */
> --
> 2.34.1
>
--
Fan Ni
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