From patchwork Sun Oct 1 22:31:31 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alison Schofield X-Patchwork-Id: 13405482 X-Patchwork-Delegate: vishal.l.verma@intel.com Received: from mgamail.intel.com (mgamail.intel.com [134.134.136.126]) (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 851BF1364 for ; Sun, 1 Oct 2023 22:31:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1696199500; x=1727735500; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=HeCMJQEot2esdShY0EXFtWrMW2AeAXtVWZdLs5/EsNU=; b=LEzBvgvmQ1m/p0bra8AuM8SSjXAU8i/KLoVupz7bkKKuS1vJewkwJI+k Yp8atbFEFQNEEGcJCGAHHWU9xCgdFHM/lQ+29x4e6hogN7mjaNiNcUaT1 UcFMdANFo3yVH1MZ72t+H37tP5i28tLCFjVRN5gbj4n2ux5ImMLjyrwDP Cl9GV0fjAOkiUjnCATkQfphBGgzcitptUeT6muZq62LUGdgrTtM0lKlEV dzOXpbAmliEGRJmbil+EfnWKvihioWrMpaGcl8BnK+YAuLvIodR9rMPO5 f8lLkOfphmIJr4TwrG4XxG6weNRAlraEvCsU6l3rNoqw1N6P+XLumjKNF Q==; X-IronPort-AV: E=McAfee;i="6600,9927,10850"; a="367618311" X-IronPort-AV: E=Sophos;i="6.03,193,1694761200"; d="scan'208";a="367618311" Received: from orsmga008.jf.intel.com ([10.7.209.65]) by orsmga106.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 01 Oct 2023 15:31:38 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10850"; a="779781949" X-IronPort-AV: E=Sophos;i="6.03,193,1694761200"; d="scan'208";a="779781949" Received: from aschofie-mobl2.amr.corp.intel.com (HELO localhost) ([10.251.20.198]) by orsmga008-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 01 Oct 2023 15:31:38 -0700 From: alison.schofield@intel.com To: Vishal Verma Cc: Alison Schofield , nvdimm@lists.linux.dev, linux-cxl@vger.kernel.org Subject: [ndctl PATCH v2 1/5] libcxl: add interfaces for GET_POISON_LIST mailbox commands Date: Sun, 1 Oct 2023 15:31:31 -0700 Message-Id: X-Mailer: git-send-email 2.40.1 In-Reply-To: References: Precedence: bulk X-Mailing-List: nvdimm@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: Alison Schofield CXL devices maintain a list of locations that are poisoned or result in poison if the addresses are accessed by the host. Per the spec (CXL 3.0 8.2.9.8.4.1), the device returns the Poison List as a set of Media Error Records that include the source of the error, the starting device physical address and length. Trigger the retrieval of the poison list by writing to the memory device sysfs attribute: trigger_poison_list. The CXL driver only offers triggering per memdev, so the trigger by region interface offered here is a convenience API that triggers a poison list retrieval for each memdev contributing to a region. int cxl_memdev_trigger_poison_list(struct cxl_memdev *memdev); int cxl_region_trigger_poison_list(struct cxl_region *region); The resulting poison records are logged as kernel trace events named 'cxl_poison'. Signed-off-by: Alison Schofield --- cxl/lib/libcxl.c | 47 ++++++++++++++++++++++++++++++++++++++++++++++ cxl/lib/libcxl.sym | 6 ++++++ cxl/libcxl.h | 2 ++ 3 files changed, 55 insertions(+) diff --git a/cxl/lib/libcxl.c b/cxl/lib/libcxl.c index af4ca44eae19..2f6e64ea2ae7 100644 --- a/cxl/lib/libcxl.c +++ b/cxl/lib/libcxl.c @@ -1647,6 +1647,53 @@ CXL_EXPORT int cxl_memdev_disable_invalidate(struct cxl_memdev *memdev) return 0; } +CXL_EXPORT int cxl_memdev_trigger_poison_list(struct cxl_memdev *memdev) +{ + struct cxl_ctx *ctx = cxl_memdev_get_ctx(memdev); + char *path = memdev->dev_buf; + int len = memdev->buf_len, rc; + + if (snprintf(path, len, "%s/trigger_poison_list", memdev->dev_path) >= + len) { + err(ctx, "%s: buffer too small\n", + cxl_memdev_get_devname(memdev)); + return -ENXIO; + } + rc = sysfs_write_attr(ctx, path, "1\n"); + if (rc < 0) { + fprintf(stderr, + "%s: Failed write sysfs attr trigger_poison_list\n", + cxl_memdev_get_devname(memdev)); + return rc; + } + return 0; +} + +CXL_EXPORT int cxl_region_trigger_poison_list(struct cxl_region *region) +{ + struct cxl_memdev_mapping *mapping; + int rc; + + cxl_mapping_foreach(region, mapping) { + struct cxl_decoder *decoder; + struct cxl_memdev *memdev; + + decoder = cxl_mapping_get_decoder(mapping); + if (!decoder) + continue; + + memdev = cxl_decoder_get_memdev(decoder); + if (!memdev) + continue; + + rc = cxl_memdev_trigger_poison_list(memdev); + if (rc) + return rc; + } + + return 0; +} + CXL_EXPORT int cxl_memdev_enable(struct cxl_memdev *memdev) { struct cxl_ctx *ctx = cxl_memdev_get_ctx(memdev); diff --git a/cxl/lib/libcxl.sym b/cxl/lib/libcxl.sym index 8fa1cca3d0d7..277b7e21d6a6 100644 --- a/cxl/lib/libcxl.sym +++ b/cxl/lib/libcxl.sym @@ -264,3 +264,9 @@ global: cxl_memdev_update_fw; cxl_memdev_cancel_fw_update; } LIBCXL_5; + +LIBCXL_7 { +global: + cxl_memdev_trigger_poison_list; + cxl_region_trigger_poison_list; +} LIBCXL_6; diff --git a/cxl/libcxl.h b/cxl/libcxl.h index 0f4f4b2648fb..ecdffe36df2c 100644 --- a/cxl/libcxl.h +++ b/cxl/libcxl.h @@ -460,6 +460,8 @@ enum cxl_setpartition_mode { int cxl_cmd_partition_set_mode(struct cxl_cmd *cmd, enum cxl_setpartition_mode mode); +int cxl_memdev_trigger_poison_list(struct cxl_memdev *memdev); +int cxl_region_trigger_poison_list(struct cxl_region *region); #ifdef __cplusplus } /* extern "C" */