From patchwork Thu Sep 15 16:52:09 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Janusz Krzysztofik X-Patchwork-Id: 12977660 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 gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 720ABC6FA89 for ; Thu, 15 Sep 2022 16:52:55 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id A92CF10EB81; Thu, 15 Sep 2022 16:52:40 +0000 (UTC) Received: from mga04.intel.com (mga04.intel.com [192.55.52.120]) by gabe.freedesktop.org (Postfix) with ESMTPS id 7080F10E21E; Thu, 15 Sep 2022 16:52:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1663260751; x=1694796751; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=7fTWy8K9hDvb/d8jlsXGPYJn9MBqEN7CWCphbo6fxS0=; b=QcDWWYjLaQc//MT+r+dd1rAtDpo3dEYVIDqEgwwWybgclA2DxAYiGodp S1AMyjeOaiLcKKXMq2Dzr8WuHTFrk06+YxFIM4u4akjOG72IE5sL6zADE NOJKICxAe02J26ZSXUqW5FfG4oqpLDXtviwBW7W8eVvWe0M6lEVKoO9nE xJQdZFeVZK55rqtRA5RnKA/g7bjSMKqmNF5YGmE5UZCw+93y77NyNbNkQ oWMcU25xop+Qt9xF54vEaxJI4L527emxqUqSunPuJDXUa9+LFObkpZQdZ Y8YxAw/sFmwUfAlqP0EtuilJmoiYWUP878qLKs11ggUyC5M2mrz6rcAET Q==; X-IronPort-AV: E=McAfee;i="6500,9779,10471"; a="297497960" X-IronPort-AV: E=Sophos;i="5.93,318,1654585200"; d="scan'208";a="297497960" Received: from orsmga003.jf.intel.com ([10.7.209.27]) by fmsmga104.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 15 Sep 2022 09:52:30 -0700 X-IronPort-AV: E=Sophos;i="5.93,318,1654585200"; d="scan'208";a="568501604" Received: from jkrzyszt-mobl1.ger.corp.intel.com (HELO jkrzyszt-mobl1.lan) ([10.213.25.71]) by orsmga003-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 15 Sep 2022 09:52:28 -0700 From: Janusz Krzysztofik To: intel-gfx@lists.freedesktop.org Date: Thu, 15 Sep 2022 18:52:09 +0200 Message-Id: <20220915165210.193197-2-janusz.krzysztofik@linux.intel.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220915165210.193197-1-janusz.krzysztofik@linux.intel.com> References: <20220915165210.193197-1-janusz.krzysztofik@linux.intel.com> MIME-Version: 1.0 Subject: [Intel-gfx] [PATCH v2 1/2] drm/i915/gem: Flush contexts on driver release X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Intel graphics driver community testing & development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Daniel Vetter , dri-devel@lists.freedesktop.org, Chris Wilson Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" Due to i915_perf assuming that it can use the i915_gem_context reference to protect its i915->gem.contexts.list iteration, we need to defer removal of the context from the list until last reference to the context is put. However, there is a risk of triggering kernel warning on contexts list not empty at driver release time if we deleagate that task to a worker for i915_gem_context_release_work(), unless that work is flushed first. Unfortunately, it is not flushed on driver release. Fix it. Instead of additionally calling flush_workqueue(), either directly or via a new dedicated wrapper around it, replace last call to i915_gem_drain_freed_objects() with existing i915_gem_drain_workqueue() that performs both tasks. Fixes: 75eefd82581f ("drm/i915: Release i915_gem_context from a worker") Suggested-by: Chris Wilson Signed-off-by: Janusz Krzysztofik Reviewed-by: Andi Shyti Cc: stable@kernel.org # v5.16+ --- drivers/gpu/drm/i915/i915_gem.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c index f18cc6270b2be..2bdddb61ebd7a 100644 --- a/drivers/gpu/drm/i915/i915_gem.c +++ b/drivers/gpu/drm/i915/i915_gem.c @@ -1231,7 +1231,8 @@ void i915_gem_driver_release(struct drm_i915_private *dev_priv) intel_uc_cleanup_firmwares(&to_gt(dev_priv)->uc); - i915_gem_drain_freed_objects(dev_priv); + /* Flush any outstanding work, including i915_gem_context.release_work. */ + i915_gem_drain_workqueue(dev_priv); drm_WARN_ON(&dev_priv->drm, !list_empty(&dev_priv->gem.contexts.list)); } From patchwork Thu Sep 15 16:52:10 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Janusz Krzysztofik X-Patchwork-Id: 12977661 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 gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id A7969ECAAA1 for ; Thu, 15 Sep 2022 16:52:57 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 14FD110EB80; Thu, 15 Sep 2022 16:52:43 +0000 (UTC) Received: from mga04.intel.com (mga04.intel.com [192.55.52.120]) by gabe.freedesktop.org (Postfix) with ESMTPS id E495210EB7D; Thu, 15 Sep 2022 16:52:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1663260753; x=1694796753; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=ZTs2N0QcsMiO5KMpKxsZysgv3UjJ6RRD1K+iBU+FiIY=; b=KKjrYT1tyljyUlErDRgLcii6ZkbAxeEvAR5Y0q4Vl2hSJ/nfA/zPovWe yE9iBSAwE26ODkDLF39SiPt/tAvciqMNMM2fR2GOdv6Ma9TKItvQON9vm QqF0N2erkU+u64UxtsjQagu11XkWAiQDOPw+BDfEo3m43NFvgbFShrwCy AlFMYaMV2jPjakMOUo3O5GdVsMMqT/HNX85ZsH8jr9JwMDqWqsjxxJ0aW E+S/CaibYep67RKUn4lCnlbORW/qcLZ7zK+4xPhtiD0c8FooH+DvEyJO8 jWNccuBod+y/zvXHC67ZOSglNDaqVy/pTi5aOC4emYYbYURJJ7xcdoyQ+ Q==; X-IronPort-AV: E=McAfee;i="6500,9779,10471"; a="297497974" X-IronPort-AV: E=Sophos;i="5.93,318,1654585200"; d="scan'208";a="297497974" Received: from orsmga003.jf.intel.com ([10.7.209.27]) by fmsmga104.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 15 Sep 2022 09:52:33 -0700 X-IronPort-AV: E=Sophos;i="5.93,318,1654585200"; d="scan'208";a="568501611" Received: from jkrzyszt-mobl1.ger.corp.intel.com (HELO jkrzyszt-mobl1.lan) ([10.213.25.71]) by orsmga003-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 15 Sep 2022 09:52:31 -0700 From: Janusz Krzysztofik To: intel-gfx@lists.freedesktop.org Date: Thu, 15 Sep 2022 18:52:10 +0200 Message-Id: <20220915165210.193197-3-janusz.krzysztofik@linux.intel.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220915165210.193197-1-janusz.krzysztofik@linux.intel.com> References: <20220915165210.193197-1-janusz.krzysztofik@linux.intel.com> MIME-Version: 1.0 Subject: [Intel-gfx] [PATCH v2 2/2] drm/i915/gem: Really move i915_gem_context.link under ref protection X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Intel graphics driver community testing & development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Daniel Vetter , dri-devel@lists.freedesktop.org, Chris Wilson Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" From: Chris Wilson i915_perf assumes that it can use the i915_gem_context reference to protect its i915->gem.contexts.list iteration. However, this requires that we do not remove the context from the list until after we drop the final reference and release the struct. If, as currently, we remove the context from the list during context_close(), the link.next pointer may be poisoned while we are holding the context reference and cause a GPF: [ 4070.573157] i915 0000:00:02.0: [drm:i915_perf_open_ioctl [i915]] filtering on ctx_id=0x1fffff ctx_id_mask=0x1fffff [ 4070.574881] general protection fault, probably for non-canonical address 0xdead000000000100: 0000 [#1] PREEMPT SMP [ 4070.574897] CPU: 1 PID: 284392 Comm: amd_performance Tainted: G E 5.17.9 #180 [ 4070.574903] Hardware name: Intel Corporation NUC7i5BNK/NUC7i5BNB, BIOS BNKBL357.86A.0052.2017.0918.1346 09/18/2017 [ 4070.574907] RIP: 0010:oa_configure_all_contexts.isra.0+0x222/0x350 [i915] [ 4070.574982] Code: 08 e8 32 6e 10 e1 4d 8b 6d 50 b8 ff ff ff ff 49 83 ed 50 f0 41 0f c1 04 24 83 f8 01 0f 84 e3 00 00 00 85 c0 0f 8e fa 00 00 00 <49> 8b 45 50 48 8d 70 b0 49 8d 45 50 48 39 44 24 10 0f 85 34 fe ff [ 4070.574990] RSP: 0018:ffffc90002077b78 EFLAGS: 00010202 [ 4070.574995] RAX: 0000000000000002 RBX: 0000000000000002 RCX: 0000000000000000 [ 4070.575000] RDX: 0000000000000001 RSI: ffffc90002077b20 RDI: ffff88810ddc7c68 [ 4070.575004] RBP: 0000000000000001 R08: ffff888103242648 R09: fffffffffffffffc [ 4070.575008] R10: ffffffff82c50bc0 R11: 0000000000025c80 R12: ffff888101bf1860 [ 4070.575012] R13: dead0000000000b0 R14: ffffc90002077c04 R15: ffff88810be5cabc [ 4070.575016] FS: 00007f1ed50c0780(0000) GS:ffff88885ec80000(0000) knlGS:0000000000000000 [ 4070.575021] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 4070.575025] CR2: 00007f1ed5590280 CR3: 000000010ef6f005 CR4: 00000000003706e0 [ 4070.575029] Call Trace: [ 4070.575033] [ 4070.575037] lrc_configure_all_contexts+0x13e/0x150 [i915] [ 4070.575103] gen8_enable_metric_set+0x4d/0x90 [i915] [ 4070.575164] i915_perf_open_ioctl+0xbc0/0x1500 [i915] [ 4070.575224] ? asm_common_interrupt+0x1e/0x40 [ 4070.575232] ? i915_oa_init_reg_state+0x110/0x110 [i915] [ 4070.575290] drm_ioctl_kernel+0x85/0x110 [ 4070.575296] ? update_load_avg+0x5f/0x5e0 [ 4070.575302] drm_ioctl+0x1d3/0x370 [ 4070.575307] ? i915_oa_init_reg_state+0x110/0x110 [i915] [ 4070.575382] ? gen8_gt_irq_handler+0x46/0x130 [i915] [ 4070.575445] __x64_sys_ioctl+0x3c4/0x8d0 [ 4070.575451] ? __do_softirq+0xaa/0x1d2 [ 4070.575456] do_syscall_64+0x35/0x80 [ 4070.575461] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 4070.575467] RIP: 0033:0x7f1ed5c10397 [ 4070.575471] Code: 3c 1c e8 1c ff ff ff 85 c0 79 87 49 c7 c4 ff ff ff ff 5b 5d 4c 89 e0 41 5c c3 66 0f 1f 84 00 00 00 00 00 b8 10 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d a9 da 0d 00 f7 d8 64 89 01 48 [ 4070.575478] RSP: 002b:00007ffd65c8d7a8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 4070.575484] RAX: ffffffffffffffda RBX: 0000000000000006 RCX: 00007f1ed5c10397 [ 4070.575488] RDX: 00007ffd65c8d7c0 RSI: 0000000040106476 RDI: 0000000000000006 [ 4070.575492] RBP: 00005620972f9c60 R08: 000000000000000a R09: 0000000000000005 [ 4070.575496] R10: 000000000000000d R11: 0000000000000246 R12: 000000000000000a [ 4070.575500] R13: 000000000000000d R14: 0000000000000000 R15: 00007ffd65c8d7c0 [ 4070.575505] [ 4070.575507] Modules linked in: nls_ascii(E) nls_cp437(E) vfat(E) fat(E) i915(E) x86_pkg_temp_thermal(E) intel_powerclamp(E) crct10dif_pclmul(E) crc32_pclmul(E) crc32c_intel(E) aesni_intel(E) crypto_simd(E) intel_gtt(E) cryptd(E) ttm(E) rapl(E) intel_cstate(E) drm_kms_helper(E) cfbfillrect(E) syscopyarea(E) cfbimgblt(E) intel_uncore(E) sysfillrect(E) mei_me(E) sysimgblt(E) i2c_i801(E) fb_sys_fops(E) mei(E) intel_pch_thermal(E) i2c_smbus(E) cfbcopyarea(E) video(E) button(E) efivarfs(E) autofs4(E) [ 4070.575549] ---[ end trace 0000000000000000 ]--- v2: irqsave not required in a worker, neither conversion to irq safe elsewhere (Tvrtko), - perf: it's safe to call gen8_configure_context() even if context has been closed, no need to check, - drop unrelated cleanup (Andi, Tvrtko) Reported-by: Mark Janes Closes: https://gitlab.freedesktop.org/drm/intel/issues/6222 References: a4e7ccdac38e ("drm/i915: Move context management under GEM") Fixes: f8246cf4d9a9 ("drm/i915/gem: Drop free_work for GEM contexts") Signed-off-by: Chris Wilson Reviewed-by: Andi Shyti Signed-off-by: Andi Shyti Signed-off-by: Janusz Krzysztofik Cc: Tvrtko Ursulin Cc: # v5.12+ --- drivers/gpu/drm/i915/gem/i915_gem_context.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/drivers/gpu/drm/i915/gem/i915_gem_context.c b/drivers/gpu/drm/i915/gem/i915_gem_context.c index dabdfe09f5e51..211b36ea8c75f 100644 --- a/drivers/gpu/drm/i915/gem/i915_gem_context.c +++ b/drivers/gpu/drm/i915/gem/i915_gem_context.c @@ -1269,6 +1269,10 @@ static void i915_gem_context_release_work(struct work_struct *work) trace_i915_context_free(ctx); GEM_BUG_ON(!i915_gem_context_is_closed(ctx)); + spin_lock(&ctx->i915->gem.contexts.lock, flags); + list_del(&ctx->link); + spin_unlock(&ctx->i915->gem.contexts.lock, flags); + if (ctx->syncobj) drm_syncobj_put(ctx->syncobj); @@ -1521,10 +1525,6 @@ static void context_close(struct i915_gem_context *ctx) ctx->file_priv = ERR_PTR(-EBADF); - spin_lock(&ctx->i915->gem.contexts.lock); - list_del(&ctx->link); - spin_unlock(&ctx->i915->gem.contexts.lock); - client = ctx->client; if (client) { spin_lock(&client->ctx_lock);