From patchwork Fri Feb 23 14:37:14 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Shiju Jose X-Patchwork-Id: 775556 Received: from frasgout.his.huawei.com (frasgout.his.huawei.com [185.176.79.56]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id DAA3D524F; Fri, 23 Feb 2024 14:37:42 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=185.176.79.56 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1708699065; cv=none; b=gXYJUWhlQ3ofD7K1uih8Fy7gt22F/S0GqOH/zPlsjGFIDSeaIJdgVoLs4beYsCQPzkxXHDUTVRdYdBRXMGNROW87/K6nZXT7c+17or3jnuzv0L0tNsR0K9zn0QTB91dFQbC0juf0Ye3ccQRT46aZ1yvzm0SGmkNHn+n/EdWy8Co= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1708699065; c=relaxed/simple; bh=8fFHbASJ7cdTEXIAbqPeXlnxFauqATtEpaY2ZD+dZpE=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=AjMQEDIZP3mTf92MD2TsgzBfC+lF03eyaz3WowJRR1waquDedGwMvHJLn9u/fk6QNt7KOqoKbDOFV38BNt1pPlsrDwgSX1U435R2BfCSrCIKIoCLvDGPvaB5iG5Q4kNxc4uxWDX1LQMZ7cLNM4SvmnRmq2/mLsI3apvCCip5S6c= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=huawei.com; spf=pass smtp.mailfrom=huawei.com; arc=none smtp.client-ip=185.176.79.56 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=huawei.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=huawei.com Received: from mail.maildlp.com (unknown [172.18.186.216]) by frasgout.his.huawei.com (SkyGuard) with ESMTP id 4ThCF54nwwz6K6hC; Fri, 23 Feb 2024 22:34:01 +0800 (CST) Received: from lhrpeml500006.china.huawei.com (unknown [7.191.161.198]) by mail.maildlp.com (Postfix) with ESMTPS id BE6E1140119; Fri, 23 Feb 2024 22:37:40 +0800 (CST) Received: from SecurePC30232.china.huawei.com (10.122.247.234) by lhrpeml500006.china.huawei.com (7.191.161.198) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.1.2507.35; Fri, 23 Feb 2024 14:37:39 +0000 From: To: , , , , , , , , , CC: , , , , , , , , , , , , , , , , , , , , , , , , , , , , , Subject: [RFC PATCH v7 03/12] cxl/mbox: Add SET_FEATURE mailbox command Date: Fri, 23 Feb 2024 22:37:14 +0800 Message-ID: <20240223143723.1574-4-shiju.jose@huawei.com> X-Mailer: git-send-email 2.35.1.windows.2 In-Reply-To: <20240223143723.1574-1-shiju.jose@huawei.com> References: <20240223143723.1574-1-shiju.jose@huawei.com> Precedence: bulk X-Mailing-List: linux-acpi@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ClientProxiedBy: lhrpeml500003.china.huawei.com (7.191.162.67) To lhrpeml500006.china.huawei.com (7.191.161.198) From: Shiju Jose 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 --- drivers/cxl/core/mbox.c | 67 +++++++++++++++++++++++++++++++++++++++++ drivers/cxl/cxlmem.h | 30 ++++++++++++++++++ 2 files changed, 97 insertions(+) diff --git a/drivers/cxl/core/mbox.c b/drivers/cxl/core/mbox.c index c078e62ea194..d1660bd20bdb 100644 --- a/drivers/cxl/core/mbox.c +++ b/drivers/cxl/core/mbox.c @@ -1366,6 +1366,73 @@ size_t 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, + const uuid_t feat_uuid, u8 feat_version, + void *feat_data, size_t feat_data_size, + u8 feat_flag) +{ + 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(mds->payload_size, GFP_KERNEL); + pi->hdr.uuid = feat_uuid; + pi->hdr.version = feat_version; + feat_flag &= ~CXL_SET_FEAT_FLAG_DATA_TRANSFER_MASK; + hdr_size = sizeof(pi->hdr); + /* + * Check minimum mbox payload size is available for + * the feature data transfer. + */ + if (hdr_size + 10 > mds->payload_size) + return -ENOMEM; + + if ((hdr_size + feat_data_size) <= mds->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 = mds->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(mds, &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) <= (mds->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); + + return rc; +} +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 bcfefff062a6..a8d4104afa53 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, @@ -773,6 +774,31 @@ 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_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; + /* Get Poison List CXL 3.0 Spec 8.2.9.8.4.1 */ struct cxl_mbox_poison_in { __le64 offset; @@ -912,6 +938,10 @@ size_t cxl_get_feature(struct cxl_memdev_state *mds, size_t feat_out_size, size_t feat_out_min_size, enum cxl_get_feat_selection selection); +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_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);