From patchwork Tue Jul 5 15:49:32 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ira Weiny X-Patchwork-Id: 12906773 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 8E80EC433EF for ; Tue, 5 Jul 2022 15:52:46 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229522AbiGEPwp (ORCPT ); Tue, 5 Jul 2022 11:52:45 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46726 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232583AbiGEPwN (ORCPT ); Tue, 5 Jul 2022 11:52:13 -0400 Received: from mga14.intel.com (mga14.intel.com [192.55.52.115]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 57CA41ADA7; Tue, 5 Jul 2022 08:51:00 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1657036260; x=1688572260; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=MrUkDRSD1Y6mEq3225D3Q5VxySFsvbxA4NqScTaux9w=; b=Agmen2Wv0/Fl2Fmu/12WPAMQTvpTmslSKPIiCx3PukwYVIlB6KLsXA+p BpRyBstHnhq7QhKSUMCvVJKVL6lPfZKaTCCaABcIr3ATTqOqLVgkoRBdL 2/uFZejzbXhNWvfU8rsHGktgyMZMT4x6OE/e4ge/cSUg9Dq4Q6Ku/LsHZ 9sJ1p+Vyu4PwzfpCnd28BmSbcYsaXkeyDs7j3ddoWLzoyAG9KihD6+ohY hyxNHsFbxPH//oomA8LuzqmYMcMpHcIS9Rqtz7hjg1a0iOqaAlNmkq/w5 6WvMvLustQoABnQNfEZazlnNB5zdSNK1WI4UyLXkyIEhl4CUrTkk+BTFf A==; X-IronPort-AV: E=McAfee;i="6400,9594,10398"; a="283414943" X-IronPort-AV: E=Sophos;i="5.92,247,1650956400"; d="scan'208";a="283414943" Received: from fmsmga007.fm.intel.com ([10.253.24.52]) by fmsmga103.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 05 Jul 2022 08:50:37 -0700 X-IronPort-AV: E=Sophos;i="5.92,247,1650956400"; d="scan'208";a="597333673" Received: from amangla-mobl.amr.corp.intel.com (HELO localhost) ([10.255.0.184]) by fmsmga007-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 05 Jul 2022 08:50:12 -0700 From: ira.weiny@intel.com To: Dan Williams , Bjorn Helgaas , Jonathan Cameron Cc: Ira Weiny , Lukas Wunner , Alison Schofield , Vishal Verma , Dave Jiang , Ben Widawsky , linux-kernel@vger.kernel.org, linux-cxl@vger.kernel.org, linux-pci@vger.kernel.org Subject: [PATCH V13 9/9] cxl/port: Parse out DSMAS data from CDAT table Date: Tue, 5 Jul 2022 08:49:32 -0700 Message-Id: <20220705154932.2141021-10-ira.weiny@intel.com> X-Mailer: git-send-email 2.35.3 In-Reply-To: <20220705154932.2141021-1-ira.weiny@intel.com> References: <20220705154932.2141021-1-ira.weiny@intel.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org From: Ira Weiny CXL Ports with memory devices attached need the information from the Device Scoped Memory Affinity Structure (DSMAS). This information is contained within the CDAT table buffer which is cached in the port device. If CDAT data is available, parse and cache DSMAS data from the table. Store this data in unmarshaled struct dsmas data structures for ease of use later. Ensure DSMAS headers are not malicious or ill formed so as to cause buffer overflow errors. Reviewed-by: Jonathan Cameron Signed-off-by: Ira Weiny --- Changes from V10 From Ben Widawsky Check data lengths to protect against malicious devices Changes from V8 Adjust to the cdat data being in cxl_port Changes from V7 Rebased on cxl-pending Changes from V6 Move to port.c It is not an error if no DSMAS data is found Changes from V5 Fix up sparse warnings Split out cdat_hdr_valid() Update cdat_hdr_valid() Remove revision and cs field parsing There is no point in these Add seq check and debug print. From Jonathan Add spaces around '+' and '/' use devm_krealloc() for dmas_ary --- drivers/cxl/cdat.h | 23 ++++++++++++++ drivers/cxl/core/pci.c | 72 ++++++++++++++++++++++++++++++++++++++++++ drivers/cxl/cxl.h | 2 ++ drivers/cxl/cxlmem.h | 4 +++ drivers/cxl/cxlpci.h | 1 + drivers/cxl/mem.c | 1 + 6 files changed, 103 insertions(+) diff --git a/drivers/cxl/cdat.h b/drivers/cxl/cdat.h index 39eb561081f2..ca1f55762416 100644 --- a/drivers/cxl/cdat.h +++ b/drivers/cxl/cdat.h @@ -51,6 +51,7 @@ #define CDAT_DSMAS_DPA_OFFSET(entry) ((u64)((entry)[3]) << 32 | (entry)[2]) #define CDAT_DSMAS_DPA_LEN(entry) ((u64)((entry)[5]) << 32 | (entry)[4]) #define CDAT_DSMAS_NON_VOLATILE(flags) ((flags & 0x04) >> 2) +#define CDAT_DSMAS_ENTRY_SIZE (6 * sizeof(u32)) /* Device Scoped Latency and Bandwidth Information Structure */ #define CDAT_DSLBIS_DW1_HANDLE 0x000000ff @@ -60,22 +61,26 @@ #define CDAT_DSLBIS_DW4_ENTRY_0 0x0000ffff #define CDAT_DSLBIS_DW4_ENTRY_1 0xffff0000 #define CDAT_DSLBIS_DW5_ENTRY_2 0x0000ffff +#define CDAT_DSLBIS_ENTRY_SIZE (6 * sizeof(u32)) /* Device Scoped Memory Side Cache Information Structure */ #define CDAT_DSMSCIS_DW1_HANDLE 0x000000ff #define CDAT_DSMSCIS_MEMORY_SIDE_CACHE_SIZE(entry) \ ((u64)((entry)[3]) << 32 | (entry)[2]) #define CDAT_DSMSCIS_DW4_MEMORY_SIDE_CACHE_ATTRS 0xffffffff +#define CDAT_DSMSCIS_ENTRY_SIZE (5 * sizeof(u32)) /* Device Scoped Initiator Structure */ #define CDAT_DSIS_DW1_FLAGS 0x000000ff #define CDAT_DSIS_DW1_HANDLE 0x0000ff00 +#define CDAT_DSIS_ENTRY_SIZE (2 * sizeof(u32)) /* Device Scoped EFI Memory Type Structure */ #define CDAT_DSEMTS_DW1_HANDLE 0x000000ff #define CDAT_DSEMTS_DW1_EFI_MEMORY_TYPE_ATTR 0x0000ff00 #define CDAT_DSEMTS_DPA_OFFSET(entry) ((u64)((entry)[3]) << 32 | (entry)[2]) #define CDAT_DSEMTS_DPA_LENGTH(entry) ((u64)((entry)[5]) << 32 | (entry)[4]) +#define CDAT_DSEMTS_ENTRY_SIZE (6 * sizeof(u32)) /* Switch Scoped Latency and Bandwidth Information Structure */ #define CDAT_SSLBIS_DW1_DATA_TYPE 0x000000ff @@ -83,9 +88,27 @@ #define CDAT_SSLBIS_ENTRY_PORT_X(entry, i) ((entry)[4 + (i) * 2] & 0x0000ffff) #define CDAT_SSLBIS_ENTRY_PORT_Y(entry, i) (((entry)[4 + (i) * 2] & 0xffff0000) >> 16) #define CDAT_SSLBIS_ENTRY_LAT_OR_BW(entry, i) ((entry)[4 + (i) * 2 + 1] & 0x0000ffff) +#define CDAT_SSLBIS_HEADER_SIZE (6 * sizeof(u32)) #define CXL_DOE_PROTOCOL_TABLE_ACCESS 2 +/** + * struct cxl_dsmas - host unmarshaled version of DSMAS data + * + * As defined in the Coherent Device Attribute Table (CDAT) specification this + * represents a single DSMAS entry in that table. + * + * @dpa_base: The lowest Device Physical Address associated with this DSMAD + * @length: Length in bytes of this DSMAD + * @non_volatile: If set, the memory region represents Non-Volatile memory + */ +struct cxl_dsmas { + u64 dpa_base; + u64 length; + /* Flags */ + u8 non_volatile:1; +}; + /** * struct cxl_cdat - CXL CDAT data * diff --git a/drivers/cxl/core/pci.c b/drivers/cxl/core/pci.c index 0853885c5767..1b931542d345 100644 --- a/drivers/cxl/core/pci.c +++ b/drivers/cxl/core/pci.c @@ -684,3 +684,75 @@ void read_cdat_data(struct cxl_port *port) retries); } EXPORT_SYMBOL_NS_GPL(read_cdat_data, CXL); + +void parse_dsmas(struct cxl_memdev *cxlmd, struct cxl_port *port) +{ + struct device *dev = &port->dev; + struct cxl_dsmas *dsmas_ary = NULL; + u32 *data = port->cdat.table; + int bytes_left = port->cdat.length; + int nr_dsmas = 0; + + if (!data) { + dev_info(dev, "No CDAT data available for DSMAS\n"); + return; + } + + /* Skip header */ + data += CDAT_HEADER_LENGTH_DW; + bytes_left -= CDAT_HEADER_LENGTH_BYTES; + + while (bytes_left > 0) { + u32 *cur_rec = data; + u8 type = FIELD_GET(CDAT_STRUCTURE_DW0_TYPE, cur_rec[0]); + u16 length = FIELD_GET(CDAT_STRUCTURE_DW0_LENGTH, cur_rec[0]); + + if (type == CDAT_STRUCTURE_DW0_TYPE_DSMAS) { + struct cxl_dsmas *new_ary; + u8 flags; + + /* Protect against malicious devices */ + if (bytes_left < CDAT_DSMAS_ENTRY_SIZE || + length != CDAT_DSMAS_ENTRY_SIZE) { + dev_err(dev, "Invalid DSMAS data detected\n"); + return; + } + + new_ary = devm_krealloc(dev, dsmas_ary, + sizeof(*dsmas_ary) * (nr_dsmas + 1), + GFP_KERNEL); + if (!new_ary) { + dev_err(dev, + "Failed to allocate memory for DSMAS data (nr_dsmas %d)\n", + nr_dsmas); + return; + } + dsmas_ary = new_ary; + + flags = FIELD_GET(CDAT_DSMAS_DW1_FLAGS, cur_rec[1]); + + dsmas_ary[nr_dsmas].dpa_base = CDAT_DSMAS_DPA_OFFSET(cur_rec); + dsmas_ary[nr_dsmas].length = CDAT_DSMAS_DPA_LEN(cur_rec); + dsmas_ary[nr_dsmas].non_volatile = CDAT_DSMAS_NON_VOLATILE(flags); + + dev_dbg(dev, "DSMAS %d: %llx:%llx %s\n", + nr_dsmas, + dsmas_ary[nr_dsmas].dpa_base, + dsmas_ary[nr_dsmas].dpa_base + + dsmas_ary[nr_dsmas].length, + (dsmas_ary[nr_dsmas].non_volatile ? + "Persistent" : "Volatile") + ); + + nr_dsmas++; + } + + data += (length / sizeof(u32)); + bytes_left -= length; + } + + dev_dbg(dev, "Found %d DSMAS entries\n", nr_dsmas); + cxlmd->dsmas_ary = dsmas_ary; + cxlmd->nr_dsmas = nr_dsmas; +} +EXPORT_SYMBOL_NS_GPL(parse_dsmas, CXL); diff --git a/drivers/cxl/cxl.h b/drivers/cxl/cxl.h index 9a08379000a0..5332b4d52d55 100644 --- a/drivers/cxl/cxl.h +++ b/drivers/cxl/cxl.h @@ -10,6 +10,8 @@ #include #include "cdat.h" +#include "cdat.h" + /** * DOC: cxl objects * diff --git a/drivers/cxl/cxlmem.h b/drivers/cxl/cxlmem.h index 360f282ef80c..54231c26470c 100644 --- a/drivers/cxl/cxlmem.h +++ b/drivers/cxl/cxlmem.h @@ -36,6 +36,8 @@ * @cxlds: The device state backing this device * @detach_work: active memdev lost a port in its ancestry * @id: id number of this memdev instance. + * @dsmas_ary: Array of DSMAS entries as parsed from the CDAT table + * @nr_dsmas: Number of entries in dsmas_ary */ struct cxl_memdev { struct device dev; @@ -43,6 +45,8 @@ struct cxl_memdev { struct cxl_dev_state *cxlds; struct work_struct detach_work; int id; + struct cxl_dsmas *dsmas_ary; + int nr_dsmas; }; static inline struct cxl_memdev *to_cxl_memdev(struct device *dev) diff --git a/drivers/cxl/cxlpci.h b/drivers/cxl/cxlpci.h index eec597dbe763..3e68804d8935 100644 --- a/drivers/cxl/cxlpci.h +++ b/drivers/cxl/cxlpci.h @@ -75,4 +75,5 @@ int devm_cxl_port_enumerate_dports(struct cxl_port *port); struct cxl_dev_state; int cxl_hdm_decode_init(struct cxl_dev_state *cxlds, struct cxl_hdm *cxlhdm); void read_cdat_data(struct cxl_port *port); +void parse_dsmas(struct cxl_memdev *cxlmd, struct cxl_port *port); #endif /* __CXL_PCI_H__ */ diff --git a/drivers/cxl/mem.c b/drivers/cxl/mem.c index c310f1fd3db0..a8768df4ae38 100644 --- a/drivers/cxl/mem.c +++ b/drivers/cxl/mem.c @@ -35,6 +35,7 @@ static int create_endpoint(struct cxl_memdev *cxlmd, if (IS_ERR(endpoint)) return PTR_ERR(endpoint); + parse_dsmas(cxlmd, endpoint); dev_dbg(&cxlmd->dev, "add: %s\n", dev_name(&endpoint->dev)); if (!endpoint->dev.driver) {