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GET /api/patches/809919/?format=api
{ "id": 809919, "url": "http://patchwork.ozlabs.org/api/patches/809919/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linuxppc-dev/patch/20170905041555.27696-4-bsingharora@gmail.com/", "project": { "id": 2, "url": "http://patchwork.ozlabs.org/api/projects/2/?format=api", "name": "Linux PPC development", "link_name": "linuxppc-dev", "list_id": "linuxppc-dev.lists.ozlabs.org", "list_email": "linuxppc-dev@lists.ozlabs.org", "web_url": "https://github.com/linuxppc/wiki/wiki", "scm_url": "https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git", "webscm_url": "https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git/", "list_archive_url": "https://lore.kernel.org/linuxppc-dev/", "list_archive_url_format": "https://lore.kernel.org/linuxppc-dev/{}/", "commit_url_format": "https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git/commit/?id={}" }, "msgid": "<20170905041555.27696-4-bsingharora@gmail.com>", "list_archive_url": "https://lore.kernel.org/linuxppc-dev/20170905041555.27696-4-bsingharora@gmail.com/", "date": "2017-09-05T04:15:55", "name": "[rfc,3/3] powerpc/mce: hookup memory_failure for UE errors", "commit_ref": null, "pull_url": null, "state": "superseded", "archived": true, "hash": "a04180b472c4056a3f54132e252689d2cc2fd167", "submitter": { "id": 9347, "url": "http://patchwork.ozlabs.org/api/people/9347/?format=api", "name": "Balbir Singh", "email": "bsingharora@gmail.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/linuxppc-dev/patch/20170905041555.27696-4-bsingharora@gmail.com/mbox/", "series": [ { "id": 1484, "url": "http://patchwork.ozlabs.org/api/series/1484/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linuxppc-dev/list/?series=1484", "date": "2017-09-05T04:15:52", "name": "Revisit MCE handling for UE errors", "version": 1, "mbox": "http://patchwork.ozlabs.org/series/1484/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/809919/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/809919/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "<linuxppc-dev-bounces+patchwork-incoming=ozlabs.org@lists.ozlabs.org>", "X-Original-To": [ "patchwork-incoming@ozlabs.org", "linuxppc-dev@lists.ozlabs.org" ], "Delivered-To": [ "patchwork-incoming@ozlabs.org", "linuxppc-dev@lists.ozlabs.org", "linuxppc-dev@ozlabs.org" ], "Received": [ "from lists.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3])\n\t(using TLSv1.2 with cipher ADH-AES256-GCM-SHA384 (256/256 bits))\n\t(No client certificate requested)\n\tby ozlabs.org (Postfix) with ESMTPS id 3xmYVk3dLGz9s9Y\n\tfor <patchwork-incoming@ozlabs.org>;\n\tTue, 5 Sep 2017 14:23:26 +1000 (AEST)", "from lists.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3])\n\tby lists.ozlabs.org (Postfix) with ESMTP id 3xmYVk2GVZzDrCc\n\tfor <patchwork-incoming@ozlabs.org>;\n\tTue, 5 Sep 2017 14:23:26 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"[rfc 3/3] powerpc/mce: hookup memory_failure for UE errors", "Date": "Tue, 5 Sep 2017 14:15:55 +1000", "Message-Id": "<20170905041555.27696-4-bsingharora@gmail.com>", "X-Mailer": "git-send-email 2.9.5", "In-Reply-To": "<20170905041555.27696-1-bsingharora@gmail.com>", "References": "<20170905041555.27696-1-bsingharora@gmail.com>", "X-BeenThere": "linuxppc-dev@lists.ozlabs.org", "X-Mailman-Version": "2.1.23", "Precedence": "list", "List-Id": "Linux on PowerPC Developers Mail List\n\t<linuxppc-dev.lists.ozlabs.org>", "List-Unsubscribe": "<https://lists.ozlabs.org/options/linuxppc-dev>,\n\t<mailto:linuxppc-dev-request@lists.ozlabs.org?subject=unsubscribe>", "List-Archive": "<http://lists.ozlabs.org/pipermail/linuxppc-dev/>", "List-Post": "<mailto:linuxppc-dev@lists.ozlabs.org>", "List-Help": "<mailto:linuxppc-dev-request@lists.ozlabs.org?subject=help>", "List-Subscribe": "<https://lists.ozlabs.org/listinfo/linuxppc-dev>,\n\t<mailto:linuxppc-dev-request@lists.ozlabs.org?subject=subscribe>", "Cc": "linuxppc-dev@ozlabs.org", "Errors-To": "linuxppc-dev-bounces+patchwork-incoming=ozlabs.org@lists.ozlabs.org", "Sender": "\"Linuxppc-dev\"\n\t<linuxppc-dev-bounces+patchwork-incoming=ozlabs.org@lists.ozlabs.org>" }, "content": "If we are in user space and hit a UE error, we now have the\nbasic infrastructure to walk the page tables and find out\nthe effective address that was accessed, since the DAR\nis not valid.\n\nWe use a work_queue content to hookup the bad pfn, any\nother context causes problems, since memory_failure itself\ncan call into schedule() via lru_drain_ bits.\n\nWe could probably poison the struct page to avoid a race\nbetween detection and taking corrective action.\n\nSigned-off-by: Balbir Singh <bsingharora@gmail.com>\n---\n arch/powerpc/kernel/mce.c | 62 ++++++++++++++++++++++++++++++++++++++++++++---\n 1 file changed, 59 insertions(+), 3 deletions(-)", "diff": "diff --git a/arch/powerpc/kernel/mce.c b/arch/powerpc/kernel/mce.c\nindex f41a75d..39986d5 100644\n--- a/arch/powerpc/kernel/mce.c\n+++ b/arch/powerpc/kernel/mce.c\n@@ -39,11 +39,20 @@ static DEFINE_PER_CPU(struct machine_check_event[MAX_MC_EVT], mce_event);\n static DEFINE_PER_CPU(int, mce_queue_count);\n static DEFINE_PER_CPU(struct machine_check_event[MAX_MC_EVT], mce_event_queue);\n \n+/* Queue for delayed MCE UE events. */\n+static DEFINE_PER_CPU(int, mce_ue_count);\n+static DEFINE_PER_CPU(struct machine_check_event[MAX_MC_EVT], mce_ue_event_queue);\n+\n static void machine_check_process_queued_event(struct irq_work *work);\n+void machine_check_ue_event(struct machine_check_event *evt);\n+static void machine_process_ue_event(struct work_struct *work);\n+\n static struct irq_work mce_event_process_work = {\n .func = machine_check_process_queued_event,\n };\n \n+DECLARE_WORK(mce_ue_event_work, machine_process_ue_event);\n+\n static void mce_set_error_info(struct machine_check_event *mce,\n \t\t\t struct mce_error_info *mce_err)\n {\n@@ -143,6 +152,7 @@ void save_mce_event(struct pt_regs *regs, long handled,\n \t\tif (phys_addr != ULONG_MAX) {\n \t\t\tmce->u.ue_error.physical_address_provided = true;\n \t\t\tmce->u.ue_error.physical_address = phys_addr;\n+\t\t\tmachine_check_ue_event(mce);\n \t\t}\n \t}\n \treturn;\n@@ -197,6 +207,26 @@ void release_mce_event(void)\n \tget_mce_event(NULL, true);\n }\n \n+\n+/*\n+ * Queue up the MCE event which then can be handled later.\n+ */\n+void machine_check_ue_event(struct machine_check_event *evt)\n+{\n+\tint index;\n+\n+\tindex = __this_cpu_inc_return(mce_ue_count) - 1;\n+\t/* If queue is full, just return for now. */\n+\tif (index >= MAX_MC_EVT) {\n+\t\t__this_cpu_dec(mce_ue_count);\n+\t\treturn;\n+\t}\n+\tmemcpy(this_cpu_ptr(&mce_ue_event_queue[index]), evt, sizeof(*evt));\n+\n+\t/* Queue work to process this event later. */\n+\tschedule_work(&mce_ue_event_work);\n+}\n+\n /*\n * Queue up the MCE event which then can be handled later.\n */\n@@ -219,7 +249,32 @@ void machine_check_queue_event(void)\n \t/* Queue irq work to process this event later. */\n \tirq_work_queue(&mce_event_process_work);\n }\n-\n+/*\n+ * process pending MCE event from the mce event queue. This function will be\n+ * called during syscall exit.\n+ */\n+static void machine_process_ue_event(struct work_struct *work)\n+{\n+\tint index;\n+\tstruct machine_check_event *evt;\n+\n+\twhile (__this_cpu_read(mce_ue_count) > 0) {\n+\t\tindex = __this_cpu_read(mce_ue_count) - 1;\n+\t\tevt = this_cpu_ptr(&mce_ue_event_queue[index]);\n+#ifdef CONFIG_MEMORY_FAILURE\n+\t\t/*\n+\t\t * This should probably queued elsewhere, but\n+\t\t * oh! well\n+\t\t */\n+\t\tif (evt->error_type == MCE_ERROR_TYPE_UE) {\n+\t\t\tif (evt->u.ue_error.physical_address_provided)\n+\t\t\t\tmemory_failure(evt->u.ue_error.physical_address,\n+\t\t\t\t\t\tSIGBUS, 0);\n+\t\t}\n+#endif\n+\t\t__this_cpu_dec(mce_ue_count);\n+\t}\n+}\n /*\n * process pending MCE event from the mce event queue. This function will be\n * called during syscall exit.\n@@ -227,6 +282,7 @@ void machine_check_queue_event(void)\n static void machine_check_process_queued_event(struct irq_work *work)\n {\n \tint index;\n+\tstruct machine_check_event *evt;\n \n \tadd_taint(TAINT_MACHINE_CHECK, LOCKDEP_NOW_UNRELIABLE);\n \n@@ -236,8 +292,8 @@ static void machine_check_process_queued_event(struct irq_work *work)\n \t */\n \twhile (__this_cpu_read(mce_queue_count) > 0) {\n \t\tindex = __this_cpu_read(mce_queue_count) - 1;\n-\t\tmachine_check_print_event_info(\n-\t\t\t\tthis_cpu_ptr(&mce_event_queue[index]), false);\n+\t\tevt = this_cpu_ptr(&mce_event_queue[index]);\n+\t\tmachine_check_print_event_info(evt, false);\n \t\t__this_cpu_dec(mce_queue_count);\n \t}\n }\n", "prefixes": [ "rfc", "3/3" ] }