From patchwork Thu Oct 13 23:39:01 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alison Schofield X-Patchwork-Id: 13006559 Received: from mga17.intel.com (mga17.intel.com [192.55.52.151]) (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 575DD443F for ; Thu, 13 Oct 2022 23:39:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1665704348; x=1697240348; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=eN6lcDVjsR55vDtjZErE2HjYBzlQ5DmzvW/qI5ib3Mw=; b=K9DRE3QjfeSfzOf6JIV49aevpI68uWvNMUAj3wabJqrr8/yb7j3xE37G YGpxt/Z12V7jWkui84j0ieBF6NNyAfH1oKktS6l0V3GcOn8p2aGZJpcBz Zp7XQaRENRJ5VxAVrbKjCag0UOn5BS4jpHjXV8yijZ6Wx4YgEDF2EX2P8 63RlaQUtxjtS2IuNrEFGakk4d8IM6lsaYLSfFKsg+/zJPUZeRCHdDNSto G8iuwjfFZslFOdYXb0+fU3OsMsXZJmGH+Zh2IPoF4/xm++CkIhQbPaVtV HNdvC5bHQWZj2YYpjJshz69O3r6d0rvwlZH4kvqmaEfyQffocM6FYc1NM Q==; X-IronPort-AV: E=McAfee;i="6500,9779,10499"; a="285620550" X-IronPort-AV: E=Sophos;i="5.95,182,1661842800"; d="scan'208";a="285620550" Received: from fmsmga006.fm.intel.com ([10.253.24.20]) by fmsmga107.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 13 Oct 2022 16:39:07 -0700 X-IronPort-AV: E=McAfee;i="6500,9779,10499"; a="872527640" X-IronPort-AV: E=Sophos;i="5.95,182,1661842800"; d="scan'208";a="872527640" Received: from aschofie-mobl2.amr.corp.intel.com (HELO localhost) ([10.212.171.186]) by fmsmga006-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 13 Oct 2022 16:39:07 -0700 From: alison.schofield@intel.com To: Dan Williams , Ira Weiny , Vishal Verma , Dave Jiang , Ben Widawsky Cc: Alison Schofield , nvdimm@lists.linux.dev, linux-cxl@vger.kernel.org Subject: [RFC 1/3] libcxl: add interfaces for GET_POISON_LIST mailbox commands Date: Thu, 13 Oct 2022 16:39:01 -0700 Message-Id: <2b277ebcb8dff698a5d1beddeae525ff7e30aba6.1665699750.git.alison.schofield@intel.com> X-Mailer: git-send-email 2.37.3 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 this 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 device sysfs attribute: trigger_poison_list. The retrieval is offered by memdev or by region: int cxl_memdev_trigger_poison_list(struct cxl_memdev *memdev); int cxl_region_trigger_poison_list(struct cxl_region *region); This interface only triggers the retrieval of the poison list from the devices. Users need to use the kernel trace event 'cxl_poison' to collect and view the error records. Signed-off-by: Alison Schofield --- cxl/lib/libcxl.c | 40 ++++++++++++++++++++++++++++++++++++++++ cxl/lib/libcxl.sym | 6 ++++++ cxl/libcxl.h | 2 ++ 3 files changed, 48 insertions(+) diff --git a/cxl/lib/libcxl.c b/cxl/lib/libcxl.c index e8c5d4444dd0..a99ac154b7d2 100644 --- a/cxl/lib/libcxl.c +++ b/cxl/lib/libcxl.c @@ -1331,6 +1331,46 @@ 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_ctx *ctx = cxl_region_get_ctx(region); + char *path = region->dev_buf; + int len = region->buf_len, rc; + + if (snprintf(path, len, "%s/trigger_poison_list", region->dev_path) >= len) { + err(ctx, "%s: buffer too small\n", + cxl_region_get_devname(region)); + 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_region_get_devname(region)); + 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 8bb91e05638b..ecf98e6c7af2 100644 --- a/cxl/lib/libcxl.sym +++ b/cxl/lib/libcxl.sym @@ -217,3 +217,9 @@ global: cxl_decoder_get_max_available_extent; cxl_decoder_get_region; } LIBCXL_2; + +LIBCXL_4 { +global: + cxl_memdev_trigger_poison_list; + cxl_region_trigger_poison_list; +} LIBCXL_3; diff --git a/cxl/libcxl.h b/cxl/libcxl.h index 9fe4e99263dd..5ebdf0879325 100644 --- a/cxl/libcxl.h +++ b/cxl/libcxl.h @@ -375,6 +375,8 @@ 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" */