From patchwork Mon Jan 11 22:51:19 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ben Widawsky X-Patchwork-Id: 362208 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id CDD35C4332B for ; Tue, 12 Jan 2021 00:28:06 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B56AD22D5B for ; Tue, 12 Jan 2021 00:28:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730191AbhALA0C (ORCPT ); Mon, 11 Jan 2021 19:26:02 -0500 Received: from mga01.intel.com ([192.55.52.88]:57916 "EHLO mga01.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2403769AbhAKXDR (ORCPT ); Mon, 11 Jan 2021 18:03:17 -0500 IronPort-SDR: Re2wVHhm4pexTxUat6KC1CFp68ny0C3Ol4dPltUDmoL1UmRGI8cQ+LKfimymjVttQWQInt0LAo McN1qndaz1Vw== X-IronPort-AV: E=McAfee;i="6000,8403,9861"; a="196564979" X-IronPort-AV: E=Sophos;i="5.79,339,1602572400"; d="scan'208";a="196564979" Received: from orsmga008.jf.intel.com ([10.7.209.65]) by fmsmga101.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 11 Jan 2021 15:01:31 -0800 IronPort-SDR: 14E5TqDhnnLzkdrRTvUknmJbHxwNu1T6J4ys78BbXFIC8Apjb+sWk4IhZ2ihkzbyVOR+K9hieo ysb+XzD/Tn6Q== X-IronPort-AV: E=Sophos;i="5.79,339,1602572400"; d="scan'208";a="381181334" Received: from yyang31-mobl.amr.corp.intel.com (HELO intel.com) ([10.252.142.71]) by orsmga008-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 11 Jan 2021 15:01:31 -0800 Received: from fmsmsx612.amr.corp.intel.com (10.18.126.92) by fmsmsx612.amr.corp.intel.com (10.18.126.92) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.1713.5 via Mailbox Transport; Mon, 11 Jan 2021 14:51:44 -0800 Received: from fmsmsx609.amr.corp.intel.com (10.18.126.89) by fmsmsx612.amr.corp.intel.com (10.18.126.92) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.1713.5; Mon, 11 Jan 2021 14:51:44 -0800 Received: from fmsmga008.fm.intel.com (10.253.24.58) by fmsmsx609.amr.corp.intel.com (10.18.126.89) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.1713.5 via Frontend Transport; Mon, 11 Jan 2021 14:51:44 -0800 IronPort-SDR: UNV0kNKA2Yu0Mz7uxhJI+QFRisZUciKHG/jg1FpI9MIamIbJ0R2i1ITAVatW9+3F8XJe1Tnh4A /TInKVZ32U0g== X-IronPort-AV: E=Sophos;i="5.79,339,1602572400"; d="scan'208";a="352778053" Received: from yyang31-mobl.amr.corp.intel.com (HELO bwidawsk-mobl5.local) ([10.252.142.71]) by fmsmga008-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 11 Jan 2021 14:51:43 -0800 From: Ben Widawsky To: CC: Ben Widawsky , , , "linux-acpi@vger.kernel.org, Ira Weiny" , Dan Williams , Vishal Verma , "Kelley, Sean V" , Rafael Wysocki , Bjorn Helgaas , Jonathan Cameron , "Jon Masters" , Chris Browy , "Randy Dunlap" , Christoph Hellwig , Subject: [RFC PATCH v3 14/16] cxl/mem: Use CEL for enabling commands Date: Mon, 11 Jan 2021 14:51:19 -0800 Message-ID: <20210111225121.820014-16-ben.widawsky@intel.com> X-Mailer: git-send-email 2.30.0 In-Reply-To: <20210111225121.820014-1-ben.widawsky@intel.com> References: <20210111225121.820014-1-ben.widawsky@intel.com> X-MS-Exchange-Organization-Network-Message-Id: 4dbb6473-3165-4ba4-0dd9-08d8b68377f6 X-MS-Exchange-Organization-AVStamp-Enterprise: 1.0 X-MS-Exchange-Organization-SCL: -1 X-MS-Exchange-Organization-AuthSource: fmsmsx609.amr.corp.intel.com X-MS-Exchange-Organization-AuthAs: Anonymous X-MS-Exchange-Transport-EndToEndLatency: 00:00:00.5557701 X-MS-Exchange-Processed-By-BccFoldering: 15.01.1713.001 MIME-Version: 1.0 X-TUID: W6uja01Xig3T Precedence: bulk List-ID: X-Mailing-List: linux-acpi@vger.kernel.org The Command Effects Log (CEL) is specified in the CXL 2.0 specification. The CEL is one of two types of logs, the other being vendor specific. They are distinguished in hardware/spec via UUID. The CEL is immediately useful for 2 things: 1. Determine which optional commands are supported by the CXL device. 2. Enumerate any vendor specific commands The CEL can be used by the driver to determine which commands are available in the hardware (though it isn't, yet). That set of commands might itself be a subset of commands which are available to be used via CXL_MEM_SEND_COMMAND IOCTL. Prior to this, all commands that the driver exposed were explicitly enabled. After this, only those commands that are found in the CEL are enabled. Signed-off-by: Ben Widawsky --- drivers/cxl/mem.c | 178 +++++++++++++++++++++++++++++++++-- include/uapi/linux/cxl_mem.h | 1 + 2 files changed, 172 insertions(+), 7 deletions(-) diff --git a/drivers/cxl/mem.c b/drivers/cxl/mem.c index 20b26fa2c466..6dfc8ff0aefb 100644 --- a/drivers/cxl/mem.c +++ b/drivers/cxl/mem.c @@ -44,8 +44,10 @@ enum opcode { CXL_MBOX_OP_INVALID = 0x0000, #define CXL_MBOX_OP_RAW CXL_MBOX_OP_INVALID - CXL_MBOX_OP_IDENTIFY = 0x4000, - CXL_MBOX_OP_MAX = 0x10000 + CXL_MBOX_OP_GET_SUPPORTED_LOGS = 0x0400, + CXL_MBOX_OP_GET_LOG = 0x0401, + CXL_MBOX_OP_IDENTIFY = 0x4000, + CXL_MBOX_OP_MAX = 0x10000 }; /** @@ -104,6 +106,16 @@ static struct { .opcode = CXL_MBOX_OP_##_id, \ } +enum { + CEL_UUID, + DEBUG_UUID +}; + +static const uuid_t log_uuid[] = { + UUID_INIT(0xda9c0b5, 0xbf41, 0x4b78, 0x8f, 0x79, 0x96, 0xb1, 0x62, 0x3b, 0x3f, 0x17), + UUID_INIT(0xe1819d9, 0x11a9, 0x400c, 0x81, 0x1f, 0xd6, 0x07, 0x19, 0x40, 0x3d, 0x86) +}; + /** * struct cxl_mem_command - Driver representation of a memory device command * @info: Command information as it exists for the UAPI @@ -144,6 +156,7 @@ static struct cxl_mem_command mem_commands[] = { CXL_CMD(INVALID, KERNEL, 0, 0, HIDDEN), CXL_CMD(IDENTIFY, NONE, 0, 0x43, MANDATORY), CXL_CMD(RAW, NONE, ~0, ~0, PSEUDO), + CXL_CMD(GET_SUPPORTED_LOGS, NONE, 0, ~0, MANDATORY), }; #define cxl_for_each_cmd(cmd) \ @@ -1036,6 +1049,103 @@ static int cxl_mem_add_memdev(struct cxl_mem *cxlm) return rc; } +struct cxl_mbox_get_supported_logs { + __le16 entries; + u8 rsvd[6]; + struct gsl_entry { + uuid_t uuid; + __le32 size; + } __packed entry[2]; +} __packed; +struct cxl_mbox_get_log { + uuid_t uuid; + __le32 offset; + __le32 length; +} __packed; + +static int cxl_xfer_log(struct cxl_mem *cxlm, uuid_t *uuid, u32 size, + u8 *out) +{ + u32 remaining = size; + u32 offset = 0; + + while (remaining) { + u32 xfer_size = min_t(u32, remaining, cxlm->mbox.payload_size); + struct mbox_cmd mbox_cmd; + int rc; + struct cxl_mbox_get_log log = { + .uuid = *uuid, + .offset = cpu_to_le32(offset), + .length = cpu_to_le32(xfer_size) + }; + + memcpy_toio(cxl_payload_regs(cxlm), &log, sizeof(log)); + mbox_cmd = (struct mbox_cmd) { + .opcode = CXL_MBOX_OP_GET_LOG, + .payload = NULL, + .size_in = sizeof(log), + }; + + rc = cxl_mem_mbox_send_cmd(cxlm, &mbox_cmd); + if (rc) + return rc; + + WARN_ON(mbox_cmd.size_out != xfer_size); + + memcpy_fromio(out, cxl_payload_regs(cxlm), mbox_cmd.size_out); + out += xfer_size; + remaining -= xfer_size; + offset += xfer_size; + } + + return 0; +} + +static void cxl_enable_cmd(struct cxl_mem *cxlm, + const struct cxl_mem_command *cmd) +{ + if (test_and_set_bit(cxl_cmd_index(cmd), cxlm->enabled_cmds)) + dev_warn(&cxlm->pdev->dev, "Command enabled twice\n"); + + dev_info(&cxlm->pdev->dev, "%s enabled", + command_names[cxl_cmd_index(cmd)].name); +} + +/** + * cxl_walk_cel() - Walk through the Command Effects Log. + * @cxlm: Device. + * @size: Length of the Command Effects Log. + * @cel: CEL + * + * Iterate over each entry in the CEL and determine if the driver supports the + * command. If so, the command is enabled for the device and can be used later. + */ +static void cxl_walk_cel(struct cxl_mem *cxlm, size_t size, u8 *cel) +{ + struct cel_entry { + __le16 opcode; + __le16 effect; + } *cel_entry; + const int cel_entries = size / sizeof(*cel_entry); + int i; + + cel_entry = (struct cel_entry *)cel; + + for (i = 0; i < cel_entries; i++) { + const struct cel_entry *ce = &cel_entry[i]; + const struct cxl_mem_command *cmd = + cxl_mem_find_command(le16_to_cpu(ce->opcode)); + + if (!cmd) { + dev_dbg(&cxlm->pdev->dev, "Unsupported opcode 0x%04x", + le16_to_cpu(ce->opcode)); + continue; + } + + cxl_enable_cmd(cxlm, cmd); + } +} + /** * cxl_mem_enumerate_cmds() - Enumerate commands for a device. * @cxlm: The device. @@ -1048,17 +1158,71 @@ static int cxl_mem_add_memdev(struct cxl_mem *cxlm) */ static int cxl_mem_enumerate_cmds(struct cxl_mem *cxlm) { - struct cxl_mem_command *c; + struct cxl_mbox_get_supported_logs gsl; + const struct cxl_mem_command *c; + struct mbox_cmd mbox_cmd; + int i, rc; - /* All commands are considered enabled for now (except INVALID). */ + /* Pseudo commands are always enabled */ cxl_for_each_cmd(c) { - if (c->flags & CXL_CMD_INTERNAL_FLAG_HIDDEN) + if (c->flags & CXL_CMD_INTERNAL_FLAG_PSEUDO) + cxl_enable_cmd(cxlm, c); + } + + rc = cxl_mem_mbox_get(cxlm, false); + if (rc) + return rc; + + mbox_cmd = (struct mbox_cmd){ + .opcode = CXL_MBOX_OP_GET_SUPPORTED_LOGS, + .payload = &gsl, + .size_in = 0, + }; + rc = cxl_mem_mbox_send_cmd(cxlm, &mbox_cmd); + if (rc) + goto out; + + for (i = 0; i < le16_to_cpu(gsl.entries); i++) { + u32 size = le32_to_cpu(gsl.entry[i].size); + uuid_t uuid = gsl.entry[i].uuid; + u8 *log; + + dev_dbg(&cxlm->pdev->dev, "Found LOG type %pU of size %d", + &uuid, size); + + if (!uuid_equal(&uuid, &log_uuid[CEL_UUID])) continue; - set_bit(cxl_cmd_index(c), cxlm->enabled_cmds); + /* + * It's a hardware bug if the log size is less than the input + * payload size because there are many mandatory commands. + */ + if (sizeof(struct cxl_mbox_get_log) > size) { + dev_err(&cxlm->pdev->dev, + "CEL log size reported was too small (%d)", + size); + rc = -ENOMEM; + goto out; + } + + log = kvmalloc(size, GFP_KERNEL); + if (!log) { + rc = -ENOMEM; + goto out; + } + + rc = cxl_xfer_log(cxlm, &uuid, size, log); + if (rc) + goto out; + + cxl_walk_cel(cxlm, size, log); + + kvfree(log); } - return 0; +out: + cxl_mem_mbox_put(cxlm); + return rc; } /** diff --git a/include/uapi/linux/cxl_mem.h b/include/uapi/linux/cxl_mem.h index 50acd6cc14d4..b504412d1db7 100644 --- a/include/uapi/linux/cxl_mem.h +++ b/include/uapi/linux/cxl_mem.h @@ -33,6 +33,7 @@ extern "C" { C(INVALID, "Invalid Command"), \ C(IDENTIFY, "Identify Command"), \ C(RAW, "Raw device command"), \ + C(GET_SUPPORTED_LOGS, "Get Supported Logs"), \ C(MAX, "Last command") #undef C #define C(a, b) CXL_MEM_COMMAND_ID_##a