From patchwork Tue Jul 16 15:03:30 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Shiju Jose X-Patchwork-Id: 13734607 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 E63CC19FA8F; Tue, 16 Jul 2024 15:04:38 +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=1721142280; cv=none; b=nTUtd7hrAs8mb6BRFe3/lugNuhYdSgb4IHqJo6hwOHWQ97nhG8XEJX3G6RmpHF5F0k5K/gOCF9cgWRfsmO79PUMlEAB2D9kKsvqsWJJKXO43NCo9SZLx/K2+joJ1XSKfpQjBKkE8SgqF3ShdGitFI2oOLlhC4GSnp+tnDQP//0A= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1721142280; c=relaxed/simple; bh=0wglFBAQ+5fPXG6nhUazwa84EFksY/owY+YHTB8Jls0=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=XgpHCC15zht9zpIIyqzXTgnqaVKR0yEVMGbL0TdtBBnyvKyVdOJEhy2bzrdwDYcgNOC7f1lMWOwQlMTaU8lo2dfDF1nr1lKQ/fHLt9XN4Y7ze4k2Vy6iBctZLM6vJY1ezsbJScbZ6kOF9xbPmRpWwiHW7sGU/py7insH1pSWVH0= 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 [172.18.186.31]) by frasgout.his.huawei.com (SkyGuard) with ESMTP id 4WNj3N0F6Gz6K8wS; Tue, 16 Jul 2024 23:02:24 +0800 (CST) Received: from lhrpeml500006.china.huawei.com (unknown [7.191.161.198]) by mail.maildlp.com (Postfix) with ESMTPS id F038B1400CF; Tue, 16 Jul 2024 23:04:36 +0800 (CST) Received: from P_UKIT01-A7bmah.china.huawei.com (10.48.159.153) 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 15.1.2507.39; Tue, 16 Jul 2024 16:04:35 +0100 From: To: , , , , CC: , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , Subject: [RFC PATCH v9 06/11] cxl/mbox: Add SET_FEATURE mailbox command Date: Tue, 16 Jul 2024 16:03:30 +0100 Message-ID: <20240716150336.2042-7-shiju.jose@huawei.com> X-Mailer: git-send-email 2.43.0.windows.1 In-Reply-To: <20240716150336.2042-1-shiju.jose@huawei.com> References: <20240716150336.2042-1-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: lhrpeml500005.china.huawei.com (7.191.163.240) 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 | 71 +++++++++++++++++++++++++++++++++++++++++ drivers/cxl/cxlmem.h | 33 +++++++++++++++++++ 2 files changed, 104 insertions(+) diff --git a/drivers/cxl/core/mbox.c b/drivers/cxl/core/mbox.c index b1eeed508459..50ecd2bd7372 100644 --- a/drivers/cxl/core/mbox.c +++ b/drivers/cxl/core/mbox.c @@ -1388,6 +1388,77 @@ size_t cxl_get_feature(struct cxl_memdev_state *mds, } 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_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 + FEAT_DATA_MIN_PAYLOAD_SIZE > 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); +} +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 25698a6fbe66..c3cb8e2736b5 100644 --- a/drivers/cxl/cxlmem.h +++ b/drivers/cxl/cxlmem.h @@ -532,6 +532,7 @@ 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, @@ -780,6 +781,34 @@ 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; @@ -918,6 +947,10 @@ size_t cxl_get_feature(struct cxl_memdev_state *mds, const uuid_t feat_uuid, void *feat_out, size_t feat_out_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);