From patchwork Fri Jan 27 00:28:38 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: John Harrison X-Patchwork-Id: 13118003 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 645BCC54EAA for ; Fri, 27 Jan 2023 00:29:06 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id CD3FC10E159; Fri, 27 Jan 2023 00:29:02 +0000 (UTC) Received: from mga11.intel.com (mga11.intel.com [192.55.52.93]) by gabe.freedesktop.org (Postfix) with ESMTPS id C74F310E146; Fri, 27 Jan 2023 00:29:00 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1674779340; x=1706315340; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=zTd7lf6ad9RbSljaLkuZ/But6bcl+1S+wpat7nkSU1I=; b=LokHBvtmcNbLxYZKaGE4fawOhrGp4GAR3bufjoiFfPj1qQYGw/eDJV0P XjjGxzMzVfyVdXtU39ckC9PN99SEsbosxy8mEYpHsD07W0kBEHNWiBAVz MlC+AE2ySmbTm6IjHLogwCIngl0LeiifqiNW6LN8CBIxlTkyEjhqEqDRY tKz27zvk2T7MvgJ/y7Pe0Giy2NfyaEkOq3REDbi5fRhC2l3TVm4pnT0/R AqgKKWcXCnD3bc675VcJ61fsTv6pO2Yo6E9Tsb5iP6ygfnyOrzOHV6bqw nEyUMi4GU9AkBqQpJpEzHVBKHo8WFXXdvwN6vJ9unPsIirnIAXKCZr+Zy g==; X-IronPort-AV: E=McAfee;i="6500,9779,10602"; a="324687309" X-IronPort-AV: E=Sophos;i="5.97,249,1669104000"; d="scan'208";a="324687309" Received: from fmsmga001.fm.intel.com ([10.253.24.23]) by fmsmga102.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 26 Jan 2023 16:28:52 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6500,9779,10602"; a="805621909" X-IronPort-AV: E=Sophos;i="5.97,249,1669104000"; d="scan'208";a="805621909" Received: from relo-linux-5.jf.intel.com ([10.165.21.152]) by fmsmga001.fm.intel.com with ESMTP; 26 Jan 2023 16:28:52 -0800 From: John.C.Harrison@Intel.com To: Intel-GFX@Lists.FreeDesktop.Org Date: Thu, 26 Jan 2023 16:28:38 -0800 Message-Id: <20230127002842.3169194-5-John.C.Harrison@Intel.com> X-Mailer: git-send-email 2.39.1 In-Reply-To: <20230127002842.3169194-1-John.C.Harrison@Intel.com> References: <20230127002842.3169194-1-John.C.Harrison@Intel.com> MIME-Version: 1.0 Organization: Intel Corporation (UK) Ltd. - Co. Reg. #1134945 - Pipers Way, Swindon SN3 1RJ Subject: [Intel-gfx] [PATCH v6 4/8] drm/i915: Allow error capture without a request 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: DRI-Devel@Lists.FreeDesktop.Org Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" From: John Harrison There was a report of error captures occurring without any hung context being indicated despite the capture being initiated by a 'hung context notification' from GuC. The problem was not reproducible. However, it is possible to happen if the context in question has no active requests. For example, if the hang was in the context switch itself then the breadcrumb write would have occurred and the KMD would see an idle context. In the interests of attempting to provide as much information as possible about a hang, it seems wise to include the engine info regardless of whether a request was found or not. As opposed to just prentending there was no hang at all. So update the error capture code to always record engine information if a context is given. Which means updating record_context() to take a context instead of a request (which it only ever used to find the context anyway). And split the request agnostic parts of intel_engine_coredump_add_request() out into a seaprate function. v2: Remove a duplicate 'if' statement (Umesh) and fix a put of a null pointer. v3: Tidy up request locking code flow (Tvrtko) v4: Pull in improved info message from next patch and fix up potential leak of GuC register state (Daniele) Signed-off-by: John Harrison Reviewed-by: Umesh Nerlige Ramappa (v2) Reviewed-by: Daniele Ceraolo Spurio Acked-by: Tvrtko Ursulin --- drivers/gpu/drm/i915/i915_gpu_error.c | 74 ++++++++++++++++++--------- 1 file changed, 50 insertions(+), 24 deletions(-) diff --git a/drivers/gpu/drm/i915/i915_gpu_error.c b/drivers/gpu/drm/i915/i915_gpu_error.c index b20bd6365615b..225f1b11a6b93 100644 --- a/drivers/gpu/drm/i915/i915_gpu_error.c +++ b/drivers/gpu/drm/i915/i915_gpu_error.c @@ -1370,14 +1370,14 @@ static void engine_record_execlists(struct intel_engine_coredump *ee) } static bool record_context(struct i915_gem_context_coredump *e, - const struct i915_request *rq) + struct intel_context *ce) { struct i915_gem_context *ctx; struct task_struct *task; bool simulated; rcu_read_lock(); - ctx = rcu_dereference(rq->context->gem_context); + ctx = rcu_dereference(ce->gem_context); if (ctx && !kref_get_unless_zero(&ctx->ref)) ctx = NULL; rcu_read_unlock(); @@ -1396,8 +1396,8 @@ static bool record_context(struct i915_gem_context_coredump *e, e->guilty = atomic_read(&ctx->guilty_count); e->active = atomic_read(&ctx->active_count); - e->total_runtime = intel_context_get_total_runtime_ns(rq->context); - e->avg_runtime = intel_context_get_avg_runtime_ns(rq->context); + e->total_runtime = intel_context_get_total_runtime_ns(ce); + e->avg_runtime = intel_context_get_avg_runtime_ns(ce); simulated = i915_gem_context_no_error_capture(ctx); @@ -1532,15 +1532,37 @@ intel_engine_coredump_alloc(struct intel_engine_cs *engine, gfp_t gfp, u32 dump_ return ee; } +static struct intel_engine_capture_vma * +engine_coredump_add_context(struct intel_engine_coredump *ee, + struct intel_context *ce, + gfp_t gfp) +{ + struct intel_engine_capture_vma *vma = NULL; + + ee->simulated |= record_context(&ee->context, ce); + if (ee->simulated) + return NULL; + + /* + * We need to copy these to an anonymous buffer + * as the simplest method to avoid being overwritten + * by userspace. + */ + vma = capture_vma(vma, ce->ring->vma, "ring", gfp); + vma = capture_vma(vma, ce->state, "HW context", gfp); + + return vma; +} + struct intel_engine_capture_vma * intel_engine_coredump_add_request(struct intel_engine_coredump *ee, struct i915_request *rq, gfp_t gfp) { - struct intel_engine_capture_vma *vma = NULL; + struct intel_engine_capture_vma *vma; - ee->simulated |= record_context(&ee->context, rq); - if (ee->simulated) + vma = engine_coredump_add_context(ee, rq->context, gfp); + if (!vma) return NULL; /* @@ -1550,8 +1572,6 @@ intel_engine_coredump_add_request(struct intel_engine_coredump *ee, */ vma = capture_vma_snapshot(vma, rq->batch_res, gfp, "batch"); vma = capture_user(vma, rq, gfp); - vma = capture_vma(vma, rq->ring->vma, "ring", gfp); - vma = capture_vma(vma, rq->context->state, "HW context", gfp); ee->rq_head = rq->head; ee->rq_post = rq->postfix; @@ -1604,25 +1624,31 @@ capture_engine(struct intel_engine_cs *engine, return NULL; intel_engine_get_hung_entity(engine, &ce, &rq); - if (!rq || !i915_request_started(rq)) - goto no_request_capture; + if (rq && !i915_request_started(rq)) { + drm_info(&engine->gt->i915->drm, "Got hung context on %s with active request %lld:%lld [0x%04X] not yet started\n", + engine->name, rq->fence.context, rq->fence.seqno, ce->guc_id.id); + i915_request_put(rq); + rq = NULL; + } - capture = intel_engine_coredump_add_request(ee, rq, ATOMIC_MAYFAIL); - if (!capture) - goto no_request_capture; - if (dump_flags & CORE_DUMP_FLAG_IS_GUC_CAPTURE) - intel_guc_capture_get_matching_node(engine->gt, ee, ce); + if (rq) { + capture = intel_engine_coredump_add_request(ee, rq, ATOMIC_MAYFAIL); + i915_request_put(rq); + } else if (ce) { + capture = engine_coredump_add_context(ee, ce, ATOMIC_MAYFAIL); + } - intel_engine_coredump_add_vma(ee, capture, compress); - i915_request_put(rq); + if (capture) { + intel_engine_coredump_add_vma(ee, capture, compress); - return ee; + if (dump_flags & CORE_DUMP_FLAG_IS_GUC_CAPTURE) + intel_guc_capture_get_matching_node(engine->gt, ee, ce); + } else { + kfree(ee); + ee = NULL; + } -no_request_capture: - if (rq) - i915_request_put(rq); - kfree(ee); - return NULL; + return ee; } static void