From patchwork Thu Sep 2 00:50:17 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Daniele Ceraolo Spurio X-Patchwork-Id: 12470683 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 21420C4320E for ; Thu, 2 Sep 2021 00:53:42 +0000 (UTC) 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 mail.kernel.org (Postfix) with ESMTPS id E9B8A61074 for ; Thu, 2 Sep 2021 00:53:41 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org E9B8A61074 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=intel.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id A25DB6E453; Thu, 2 Sep 2021 00:52:58 +0000 (UTC) Received: from mga12.intel.com (mga12.intel.com [192.55.52.136]) by gabe.freedesktop.org (Postfix) with ESMTPS id EC8686E435; Thu, 2 Sep 2021 00:52:53 +0000 (UTC) X-IronPort-AV: E=McAfee;i="6200,9189,10094"; a="198468261" X-IronPort-AV: E=Sophos;i="5.84,370,1620716400"; d="scan'208";a="198468261" Received: from orsmga005.jf.intel.com ([10.7.209.41]) by fmsmga106.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 01 Sep 2021 17:52:53 -0700 X-IronPort-AV: E=Sophos;i="5.84,370,1620716400"; d="scan'208";a="646030222" Received: from valcore-skull-1.fm.intel.com ([10.1.27.19]) by orsmga005-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 01 Sep 2021 17:52:53 -0700 From: Daniele Ceraolo Spurio To: intel-gfx@lists.freedesktop.org Cc: dri-devel@lists.freedesktop.org, John.C.Harrison@Intel.com, matthew.brost@intel.com Date: Wed, 1 Sep 2021 17:50:17 -0700 Message-Id: <20210902005022.711767-21-daniele.ceraolospurio@intel.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210902005022.711767-1-daniele.ceraolospurio@intel.com> References: <20210902005022.711767-1-daniele.ceraolospurio@intel.com> MIME-Version: 1.0 Subject: [Intel-gfx] [PATCH v5 20/25] drm/i915/guc: Proper xarray usage for contexts_lookup 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: , Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" From: Matthew Brost Lock the xarray and take ref to the context if needed. v2: (Checkpatch) - Add new line after declaration (Daniel Vetter) - Correct put / get accounting in xa_for_loops v3: (Checkpatch) - Extra new line Reviewed-by: Daniele Ceraolo Spurio Signed-off-by: Matthew Brost --- .../gpu/drm/i915/gt/uc/intel_guc_submission.c | 102 +++++++++++++++--- 1 file changed, 87 insertions(+), 15 deletions(-) diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c index 3062406503d8..987aec197658 100644 --- a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c +++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c @@ -608,8 +608,18 @@ static void scrub_guc_desc_for_outstanding_g2h(struct intel_guc *guc) unsigned long index, flags; bool pending_disable, pending_enable, deregister, destroyed, banned; + xa_lock_irqsave(&guc->context_lookup, flags); xa_for_each(&guc->context_lookup, index, ce) { - spin_lock_irqsave(&ce->guc_state.lock, flags); + /* + * Corner case where the ref count on the object is zero but and + * deregister G2H was lost. In this case we don't touch the ref + * count and finish the destroy of the context. + */ + bool do_put = kref_get_unless_zero(&ce->ref); + + xa_unlock(&guc->context_lookup); + + spin_lock(&ce->guc_state.lock); /* * Once we are at this point submission_disabled() is guaranteed @@ -625,7 +635,9 @@ static void scrub_guc_desc_for_outstanding_g2h(struct intel_guc *guc) banned = context_banned(ce); init_sched_state(ce); - spin_unlock_irqrestore(&ce->guc_state.lock, flags); + spin_unlock(&ce->guc_state.lock); + + GEM_BUG_ON(!do_put && !destroyed); if (pending_enable || destroyed || deregister) { decr_outstanding_submission_g2h(guc); @@ -648,13 +660,19 @@ static void scrub_guc_desc_for_outstanding_g2h(struct intel_guc *guc) } intel_context_sched_disable_unpin(ce); decr_outstanding_submission_g2h(guc); - spin_lock_irqsave(&ce->guc_state.lock, flags); + + spin_lock(&ce->guc_state.lock); guc_blocked_fence_complete(ce); - spin_unlock_irqrestore(&ce->guc_state.lock, flags); + spin_unlock(&ce->guc_state.lock); intel_context_put(ce); } + + if (do_put) + intel_context_put(ce); + xa_lock(&guc->context_lookup); } + xa_unlock_irqrestore(&guc->context_lookup, flags); } static inline bool @@ -873,16 +891,29 @@ void intel_guc_submission_reset(struct intel_guc *guc, bool stalled) { struct intel_context *ce; unsigned long index; + unsigned long flags; if (unlikely(!guc_submission_initialized(guc))) { /* Reset called during driver load? GuC not yet initialised! */ return; } - xa_for_each(&guc->context_lookup, index, ce) + xa_lock_irqsave(&guc->context_lookup, flags); + xa_for_each(&guc->context_lookup, index, ce) { + if (!kref_get_unless_zero(&ce->ref)) + continue; + + xa_unlock(&guc->context_lookup); + if (intel_context_is_pinned(ce)) __guc_reset_context(ce, stalled); + intel_context_put(ce); + + xa_lock(&guc->context_lookup); + } + xa_unlock_irqrestore(&guc->context_lookup, flags); + /* GuC is blown away, drop all references to contexts */ xa_destroy(&guc->context_lookup); } @@ -957,11 +988,24 @@ void intel_guc_submission_cancel_requests(struct intel_guc *guc) { struct intel_context *ce; unsigned long index; + unsigned long flags; + + xa_lock_irqsave(&guc->context_lookup, flags); + xa_for_each(&guc->context_lookup, index, ce) { + if (!kref_get_unless_zero(&ce->ref)) + continue; + + xa_unlock(&guc->context_lookup); - xa_for_each(&guc->context_lookup, index, ce) if (intel_context_is_pinned(ce)) guc_cancel_context_requests(ce); + intel_context_put(ce); + + xa_lock(&guc->context_lookup); + } + xa_unlock_irqrestore(&guc->context_lookup, flags); + guc_cancel_sched_engine_requests(guc->sched_engine); /* GuC is blown away, drop all references to contexts */ @@ -2849,21 +2893,28 @@ void intel_guc_find_hung_context(struct intel_engine_cs *engine) struct intel_context *ce; struct i915_request *rq; unsigned long index; + unsigned long flags; /* Reset called during driver load? GuC not yet initialised! */ if (unlikely(!guc_submission_initialized(guc))) return; + xa_lock_irqsave(&guc->context_lookup, flags); xa_for_each(&guc->context_lookup, index, ce) { - if (!intel_context_is_pinned(ce)) + if (!kref_get_unless_zero(&ce->ref)) continue; + xa_unlock(&guc->context_lookup); + + if (!intel_context_is_pinned(ce)) + goto next; + if (intel_engine_is_virtual(ce->engine)) { if (!(ce->engine->mask & engine->mask)) - continue; + goto next; } else { if (ce->engine != engine) - continue; + goto next; } list_for_each_entry(rq, &ce->guc_active.requests, sched.link) { @@ -2873,9 +2924,16 @@ void intel_guc_find_hung_context(struct intel_engine_cs *engine) intel_engine_set_hung_context(engine, ce); /* Can only cope with one hang at a time... */ - return; + intel_context_put(ce); + xa_lock(&guc->context_lookup); + goto done; } +next: + intel_context_put(ce); + xa_lock(&guc->context_lookup); } +done: + xa_unlock_irqrestore(&guc->context_lookup, flags); } void intel_guc_dump_active_requests(struct intel_engine_cs *engine, @@ -2891,23 +2949,34 @@ void intel_guc_dump_active_requests(struct intel_engine_cs *engine, if (unlikely(!guc_submission_initialized(guc))) return; + xa_lock_irqsave(&guc->context_lookup, flags); xa_for_each(&guc->context_lookup, index, ce) { - if (!intel_context_is_pinned(ce)) + if (!kref_get_unless_zero(&ce->ref)) continue; + xa_unlock(&guc->context_lookup); + + if (!intel_context_is_pinned(ce)) + goto next; + if (intel_engine_is_virtual(ce->engine)) { if (!(ce->engine->mask & engine->mask)) - continue; + goto next; } else { if (ce->engine != engine) - continue; + goto next; } - spin_lock_irqsave(&ce->guc_active.lock, flags); + spin_lock(&ce->guc_active.lock); intel_engine_dump_active_requests(&ce->guc_active.requests, hung_rq, m); - spin_unlock_irqrestore(&ce->guc_active.lock, flags); + spin_unlock(&ce->guc_active.lock); + +next: + intel_context_put(ce); + xa_lock(&guc->context_lookup); } + xa_unlock_irqrestore(&guc->context_lookup, flags); } void intel_guc_submission_print_info(struct intel_guc *guc, @@ -2961,7 +3030,9 @@ void intel_guc_submission_print_context_info(struct intel_guc *guc, { struct intel_context *ce; unsigned long index; + unsigned long flags; + xa_lock_irqsave(&guc->context_lookup, flags); xa_for_each(&guc->context_lookup, index, ce) { drm_printf(p, "GuC lrc descriptor %u:\n", ce->guc_id); drm_printf(p, "\tHW Context Desc: 0x%08x\n", ce->lrc.lrca); @@ -2980,6 +3051,7 @@ void intel_guc_submission_print_context_info(struct intel_guc *guc, guc_log_context_priority(p, ce); } + xa_unlock_irqrestore(&guc->context_lookup, flags); } static struct intel_context *