From patchwork Wed Aug 17 02:05:10 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Teres Alexis, Alan Previn" X-Patchwork-Id: 12945421 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 30FDBC25B0E for ; Wed, 17 Aug 2022 02:04:09 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 79DE510E0E0; Wed, 17 Aug 2022 02:03:57 +0000 (UTC) Received: from mga09.intel.com (mga09.intel.com [134.134.136.24]) by gabe.freedesktop.org (Postfix) with ESMTPS id 0DB4D10E0AE for ; Wed, 17 Aug 2022 02:03:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1660701832; x=1692237832; h=from:to:subject:date:message-id:in-reply-to:references: mime-version:content-transfer-encoding; bh=6hG08Zu65lQrioss2zksuK89ccD6lgfJVr/gxg+H82c=; b=Hqj6v4rLobDn+m4mDxOOO4qdyQZgvONk9N2xF101Uz+QjtlFClp+8RaH h9mvqHF9W+J7f1QX+ghCSn0XHA+b5ALx5pv6LsM596FZc0Z3rApeiKQ/g kOsT+ve6FQredu/siPi51bBbQjr7dlJx5poIP43yeK4FnLN06yTSXaR1p KYqqgNaZUS9pouT1NbodqBa/dTLjgXd/NBcHENHxUMWCv5s3wj7Znd2lg pWYultqUimC5yumfMB1nYDOZoVf1+j/qvLOma/OWjx0APYLLi3ux44j8r 5C+VdjCT57958VKuxR4DM5x081Al5AEadKqpGiG4jmFrHCY8tNNjcs9fr Q==; X-IronPort-AV: E=McAfee;i="6400,9594,10441"; a="293173722" X-IronPort-AV: E=Sophos;i="5.93,242,1654585200"; d="scan'208";a="293173722" Received: from fmsmga001.fm.intel.com ([10.253.24.23]) by orsmga102.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 16 Aug 2022 19:03:51 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.93,242,1654585200"; d="scan'208";a="749533113" Received: from aalteres-desk.fm.intel.com ([10.80.57.53]) by fmsmga001.fm.intel.com with ESMTP; 16 Aug 2022 19:03:51 -0700 From: Alan Previn To: intel-gfx@lists.freedesktop.org Date: Tue, 16 Aug 2022 19:05:10 -0700 Message-Id: <20220817020511.2180747-2-alan.previn.teres.alexis@intel.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220817020511.2180747-1-alan.previn.teres.alexis@intel.com> References: <20220817020511.2180747-1-alan.previn.teres.alexis@intel.com> MIME-Version: 1.0 Subject: [Intel-gfx] [PATCH 1/2] drm/i915/selftests: Use correct selfest calls for live tests 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 This will help in an upcoming patch where the live selftest wrappers are extended to do more. Signed-off-by: Matthew Brost Signed-off-by: Alan Previn Reviewed-by: John Harrison --- drivers/gpu/drm/i915/gem/selftests/i915_gem_coherency.c | 2 +- drivers/gpu/drm/i915/gem/selftests/i915_gem_dmabuf.c | 2 +- drivers/gpu/drm/i915/gem/selftests/i915_gem_mman.c | 2 +- drivers/gpu/drm/i915/gem/selftests/i915_gem_object.c | 2 +- drivers/gpu/drm/i915/selftests/i915_gem_gtt.c | 2 +- drivers/gpu/drm/i915/selftests/i915_perf.c | 2 +- drivers/gpu/drm/i915/selftests/i915_request.c | 2 +- drivers/gpu/drm/i915/selftests/i915_vma.c | 2 +- 8 files changed, 8 insertions(+), 8 deletions(-) diff --git a/drivers/gpu/drm/i915/gem/selftests/i915_gem_coherency.c b/drivers/gpu/drm/i915/gem/selftests/i915_gem_coherency.c index 13b088cc787e..a666d7e610f5 100644 --- a/drivers/gpu/drm/i915/gem/selftests/i915_gem_coherency.c +++ b/drivers/gpu/drm/i915/gem/selftests/i915_gem_coherency.c @@ -434,5 +434,5 @@ int i915_gem_coherency_live_selftests(struct drm_i915_private *i915) SUBTEST(igt_gem_coherency), }; - return i915_subtests(tests, i915); + return i915_live_subtests(tests, i915); } diff --git a/drivers/gpu/drm/i915/gem/selftests/i915_gem_dmabuf.c b/drivers/gpu/drm/i915/gem/selftests/i915_gem_dmabuf.c index 62c61af77a42..51ed824b020c 100644 --- a/drivers/gpu/drm/i915/gem/selftests/i915_gem_dmabuf.c +++ b/drivers/gpu/drm/i915/gem/selftests/i915_gem_dmabuf.c @@ -476,5 +476,5 @@ int i915_gem_dmabuf_live_selftests(struct drm_i915_private *i915) SUBTEST(igt_dmabuf_import_same_driver_lmem_smem), }; - return i915_subtests(tests, i915); + return i915_live_subtests(tests, i915); } diff --git a/drivers/gpu/drm/i915/gem/selftests/i915_gem_mman.c b/drivers/gpu/drm/i915/gem/selftests/i915_gem_mman.c index 3ced9948a331..3cff08f04f6c 100644 --- a/drivers/gpu/drm/i915/gem/selftests/i915_gem_mman.c +++ b/drivers/gpu/drm/i915/gem/selftests/i915_gem_mman.c @@ -1844,5 +1844,5 @@ int i915_gem_mman_live_selftests(struct drm_i915_private *i915) SUBTEST(igt_mmap_gpu), }; - return i915_subtests(tests, i915); + return i915_live_subtests(tests, i915); } diff --git a/drivers/gpu/drm/i915/gem/selftests/i915_gem_object.c b/drivers/gpu/drm/i915/gem/selftests/i915_gem_object.c index fe0a890775e2..bdf5bb40ccf1 100644 --- a/drivers/gpu/drm/i915/gem/selftests/i915_gem_object.c +++ b/drivers/gpu/drm/i915/gem/selftests/i915_gem_object.c @@ -95,5 +95,5 @@ int i915_gem_object_live_selftests(struct drm_i915_private *i915) SUBTEST(igt_gem_huge), }; - return i915_subtests(tests, i915); + return i915_live_subtests(tests, i915); } diff --git a/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c b/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c index ab9f17fc85bc..fb5e61963479 100644 --- a/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c +++ b/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c @@ -2324,5 +2324,5 @@ int i915_gem_gtt_live_selftests(struct drm_i915_private *i915) GEM_BUG_ON(offset_in_page(to_gt(i915)->ggtt->vm.total)); - return i915_subtests(tests, i915); + return i915_live_subtests(tests, i915); } diff --git a/drivers/gpu/drm/i915/selftests/i915_perf.c b/drivers/gpu/drm/i915/selftests/i915_perf.c index 88db2e3d81d0..429c6d73b159 100644 --- a/drivers/gpu/drm/i915/selftests/i915_perf.c +++ b/drivers/gpu/drm/i915/selftests/i915_perf.c @@ -431,7 +431,7 @@ int i915_perf_live_selftests(struct drm_i915_private *i915) if (err) return err; - err = i915_subtests(tests, i915); + err = i915_live_subtests(tests, i915); destroy_empty_config(&i915->perf); diff --git a/drivers/gpu/drm/i915/selftests/i915_request.c b/drivers/gpu/drm/i915/selftests/i915_request.c index ec05f578a698..818a4909c1f3 100644 --- a/drivers/gpu/drm/i915/selftests/i915_request.c +++ b/drivers/gpu/drm/i915/selftests/i915_request.c @@ -1821,7 +1821,7 @@ int i915_request_live_selftests(struct drm_i915_private *i915) if (intel_gt_is_wedged(to_gt(i915))) return 0; - return i915_subtests(tests, i915); + return i915_live_subtests(tests, i915); } static int switch_to_kernel_sync(struct intel_context *ce, int err) diff --git a/drivers/gpu/drm/i915/selftests/i915_vma.c b/drivers/gpu/drm/i915/selftests/i915_vma.c index 6921ba128015..e3821398a5b0 100644 --- a/drivers/gpu/drm/i915/selftests/i915_vma.c +++ b/drivers/gpu/drm/i915/selftests/i915_vma.c @@ -1103,5 +1103,5 @@ int i915_vma_live_selftests(struct drm_i915_private *i915) SUBTEST(igt_vma_remapped_gtt), }; - return i915_subtests(tests, i915); + return i915_live_subtests(tests, i915); } From patchwork Wed Aug 17 02:05:11 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Teres Alexis, Alan Previn" X-Patchwork-Id: 12945420 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 C78FBC25B0E for ; Wed, 17 Aug 2022 02:04:03 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id C879810E0AE; Wed, 17 Aug 2022 02:03:57 +0000 (UTC) Received: from mga09.intel.com (mga09.intel.com [134.134.136.24]) by gabe.freedesktop.org (Postfix) with ESMTPS id 3743310E0E0 for ; Wed, 17 Aug 2022 02:03:52 +0000 (UTC) DKIM-Signature: v=1; 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16 Aug 2022 19:03:51 -0700 From: Alan Previn To: intel-gfx@lists.freedesktop.org Date: Tue, 16 Aug 2022 19:05:11 -0700 Message-Id: <20220817020511.2180747-3-alan.previn.teres.alexis@intel.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220817020511.2180747-1-alan.previn.teres.alexis@intel.com> References: <20220817020511.2180747-1-alan.previn.teres.alexis@intel.com> MIME-Version: 1.0 Subject: [Intel-gfx] [PATCH 2/2] drm/i915/guc: Add delay to disable scheduling after pin count goes to zero 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 Add a delay, configurable via debugfs (default 34ms), to disable scheduling of a context after the pin count goes to zero. Disable scheduling is a costly operation as it requires synchronizing with the GuC. So the idea is that a delay allows the user to resubmit something before doing this operation. This delay is only done if the context isn't closed and less than a given threshold (default is 3/4) of the guc_ids are in use. As temporary WA disable this feature for the selftests. Selftests are very timing sensitive and any change in timing can cause failure. A follow up patch will fixup the selftests to understand this delay. Alan Previn: Matt Brost first introduced this series back in Oct 2021. However no real world workload with measured performance impact was available to prove the intended results. Today, this series is being republished in response to a real world workload that benefited greatly from it along with measured performance improvement. Workload description: 36 containers were created on a DG2 device where each container was performing a combination of 720p 3d game rendering and 30fps video encoding. The workload density was configured in a way that guaranteed each container to ALWAYS be able to render and encode no less than 30fps with a predefined maximum render + encode latency time. That means the totality of all 36 containers and their workloads were not saturating the engines to their max (in order to maintain just enough headrooom to meet the min fps and max latencies of incoming container submissions). Problem statement: It was observed that the CPU core processing the i915 soft IRQ work was experiencing severe load. Using tracelogs and an instrumentation patch to count specific i915 IRQ events, it was confirmed that the majority of the CPU cycles were caused by the gen11_other_irq_handler() -> guc_irq_handler() code path. The vast majority of the cycles was determined to be processing a specific G2H IRQ: i.e. INTEL_GUC_ACTION_SCHED_CONTEXT_MODE_DONE. These IRQs are sent by GuC in response to i915 KMD sending H2G requests: INTEL_GUC_ACTION_SCHED_CONTEXT_MODE_SET. Those H2G requests are sent whenever a context goes idle so that we can unpin the context from GuC. The high CPU utilization % symptom was limiting density scaling. Root Cause Analysis: Because the incoming execution buffers were spread across 36 different containers (each with multiple contexts) but the system in totality was NOT saturated to the max, it was assumed that each context was constantly idling between submissions. This was causing a thrashing of unpinning contexts from GuC at one moment, followed quickly by repinning them due to incoming workload the very next moment. These event-pairs were being triggered across multiple contexts per container, across all containers at the rate of > 30 times per sec per context. Metrics: When running this workload without this patch, we measured an average of ~69K INTEL_GUC_ACTION_SCHED_CONTEXT_MODE_DONE events every 10 seconds or ~10 million times over ~25+ mins. With this patch, the count reduced to ~480 every 10 seconds or about ~28K over ~10 mins. The improvement observed is ~99% for the average counts per 10 seconds. Signed-off-by: Matthew Brost Signed-off-by: Alan Previn Reviewed-by: John Harrison --- drivers/gpu/drm/i915/gem/i915_gem_context.c | 2 +- drivers/gpu/drm/i915/gt/intel_context.h | 8 + drivers/gpu/drm/i915/gt/intel_context_types.h | 7 + drivers/gpu/drm/i915/gt/uc/intel_guc.h | 16 ++ .../gpu/drm/i915/gt/uc/intel_guc_debugfs.c | 60 +++++++ .../gpu/drm/i915/gt/uc/intel_guc_submission.c | 154 +++++++++++++++--- drivers/gpu/drm/i915/i915_selftest.h | 2 + 7 files changed, 223 insertions(+), 26 deletions(-) diff --git a/drivers/gpu/drm/i915/gem/i915_gem_context.c b/drivers/gpu/drm/i915/gem/i915_gem_context.c index dabdfe09f5e5..df7fd1b019ec 100644 --- a/drivers/gpu/drm/i915/gem/i915_gem_context.c +++ b/drivers/gpu/drm/i915/gem/i915_gem_context.c @@ -1454,7 +1454,7 @@ static void engines_idle_release(struct i915_gem_context *ctx, int err; /* serialises with execbuf */ - set_bit(CONTEXT_CLOSED_BIT, &ce->flags); + intel_context_close(ce); if (!intel_context_pin_if_active(ce)) continue; diff --git a/drivers/gpu/drm/i915/gt/intel_context.h b/drivers/gpu/drm/i915/gt/intel_context.h index 8e2d70630c49..f96420f0b5bb 100644 --- a/drivers/gpu/drm/i915/gt/intel_context.h +++ b/drivers/gpu/drm/i915/gt/intel_context.h @@ -276,6 +276,14 @@ static inline bool intel_context_is_barrier(const struct intel_context *ce) return test_bit(CONTEXT_BARRIER_BIT, &ce->flags); } +static inline void intel_context_close(struct intel_context *ce) +{ + set_bit(CONTEXT_CLOSED_BIT, &ce->flags); + + if (ce->ops->close) + ce->ops->close(ce); +} + static inline bool intel_context_is_closed(const struct intel_context *ce) { return test_bit(CONTEXT_CLOSED_BIT, &ce->flags); diff --git a/drivers/gpu/drm/i915/gt/intel_context_types.h b/drivers/gpu/drm/i915/gt/intel_context_types.h index 04eacae1aca5..86ac84e2edb9 100644 --- a/drivers/gpu/drm/i915/gt/intel_context_types.h +++ b/drivers/gpu/drm/i915/gt/intel_context_types.h @@ -43,6 +43,8 @@ struct intel_context_ops { void (*revoke)(struct intel_context *ce, struct i915_request *rq, unsigned int preempt_timeout_ms); + void (*close)(struct intel_context *ce); + int (*pre_pin)(struct intel_context *ce, struct i915_gem_ww_ctx *ww, void **vaddr); int (*pin)(struct intel_context *ce, void *vaddr); void (*unpin)(struct intel_context *ce); @@ -208,6 +210,11 @@ struct intel_context { * each priority bucket */ u32 prio_count[GUC_CLIENT_PRIORITY_NUM]; + /** + * @sched_disable_delay: worker to disable scheduling on this + * context + */ + struct delayed_work sched_disable_delay; } guc_state; struct { diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc.h b/drivers/gpu/drm/i915/gt/uc/intel_guc.h index a7acffbf15d1..1f5408dc32bc 100644 --- a/drivers/gpu/drm/i915/gt/uc/intel_guc.h +++ b/drivers/gpu/drm/i915/gt/uc/intel_guc.h @@ -112,6 +112,10 @@ struct intel_guc { * refs */ struct list_head guc_id_list; + /** + * @guc_ids_in_use: Number single-lrc guc_ids in use + */ + u16 guc_ids_in_use; /** * @destroyed_contexts: list of contexts waiting to be destroyed * (deregistered with the GuC) @@ -132,6 +136,16 @@ struct intel_guc { * @reset_fail_mask: mask of engines that failed to reset */ intel_engine_mask_t reset_fail_mask; + /** + * @sched_disable_delay_ms: schedule disable delay, in ms, for + * contexts + */ + u64 sched_disable_delay_ms; + /** + * @sched_disable_gucid_threshold: threshold of min remaining available + * guc_ids before we start bypassing the schedule disable delay + */ + int sched_disable_gucid_threshold; } submission_state; /** @@ -464,4 +478,6 @@ void intel_guc_load_status(struct intel_guc *guc, struct drm_printer *p); void intel_guc_write_barrier(struct intel_guc *guc); +int intel_guc_sched_disable_gucid_threshold_max(struct intel_guc *guc); + #endif diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_debugfs.c b/drivers/gpu/drm/i915/gt/uc/intel_guc_debugfs.c index 25f09a420561..c91b150bb7ac 100644 --- a/drivers/gpu/drm/i915/gt/uc/intel_guc_debugfs.c +++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_debugfs.c @@ -71,12 +71,72 @@ static bool intel_eval_slpc_support(void *data) return intel_guc_slpc_is_used(guc); } +static int guc_sched_disable_delay_ms_get(void *data, u64 *val) +{ + struct intel_guc *guc = data; + + if (!intel_guc_submission_is_used(guc)) + return -ENODEV; + + *val = guc->submission_state.sched_disable_delay_ms; + + return 0; +} + +static int guc_sched_disable_delay_ms_set(void *data, u64 val) +{ + struct intel_guc *guc = data; + + if (!intel_guc_submission_is_used(guc)) + return -ENODEV; + + guc->submission_state.sched_disable_delay_ms = val; + + return 0; +} +DEFINE_SIMPLE_ATTRIBUTE(guc_sched_disable_delay_ms_fops, + guc_sched_disable_delay_ms_get, + guc_sched_disable_delay_ms_set, "%lld\n"); + +static int guc_sched_disable_gucid_threshold_get(void *data, u64 *val) +{ + struct intel_guc *guc = data; + + if (!intel_guc_submission_is_used(guc)) + return -ENODEV; + + *val = guc->submission_state.sched_disable_gucid_threshold; + return 0; +} + +static int guc_sched_disable_gucid_threshold_set(void *data, u64 val) +{ + struct intel_guc *guc = data; + + if (!intel_guc_submission_is_used(guc)) + return -ENODEV; + + if (val > intel_guc_sched_disable_gucid_threshold_max(guc)) + guc->submission_state.sched_disable_gucid_threshold = + intel_guc_sched_disable_gucid_threshold_max(guc); + else + guc->submission_state.sched_disable_gucid_threshold = val; + + return 0; +} +DEFINE_SIMPLE_ATTRIBUTE(guc_sched_disable_gucid_threshold_fops, + guc_sched_disable_gucid_threshold_get, + guc_sched_disable_gucid_threshold_set, "%lld\n"); + void intel_guc_debugfs_register(struct intel_guc *guc, struct dentry *root) { static const struct intel_gt_debugfs_file files[] = { { "guc_info", &guc_info_fops, NULL }, { "guc_registered_contexts", &guc_registered_contexts_fops, NULL }, { "guc_slpc_info", &guc_slpc_info_fops, &intel_eval_slpc_support}, + { "guc_sched_disable_delay_ms", &guc_sched_disable_delay_ms_fops, NULL }, + { "guc_sched_disable_gucid_threshold", &guc_sched_disable_gucid_threshold_fops, + NULL }, }; if (!intel_guc_is_supported(guc)) 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 0d17da77e787..29ddfb1f8b81 100644 --- a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c +++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c @@ -65,7 +65,13 @@ * corresponding G2H returns indicating the scheduling disable operation has * completed it is safe to unpin the context. While a disable is in flight it * isn't safe to resubmit the context so a fence is used to stall all future - * requests of that context until the G2H is returned. + * requests of that context until the G2H is returned. Because this interaction + * with the GuC takes a non-zero amount of time we delay the disabling of + * scheduling after the pin count goes to zero by a configurable period of time + * (see SCHED_DISABLE_DELAY_MS). The thought is this gives the user a window of + * time to resubmit something on the context before doing this costly operation. + * This delay is only done if the context isn't closed and the guc_id usage is + * less than a threshold (see NUM_SCHED_DISABLE_GUC_IDS_THRESHOLD). * * Context deregistration: * Before a context can be destroyed or if we steal its guc_id we must @@ -1989,6 +1995,9 @@ static int new_guc_id(struct intel_guc *guc, struct intel_context *ce) if (unlikely(ret < 0)) return ret; + if (!intel_context_is_parent(ce)) + ++guc->submission_state.guc_ids_in_use; + ce->guc_id.id = ret; return 0; } @@ -1998,14 +2007,16 @@ static void __release_guc_id(struct intel_guc *guc, struct intel_context *ce) GEM_BUG_ON(intel_context_is_child(ce)); if (!context_guc_id_invalid(ce)) { - if (intel_context_is_parent(ce)) + if (intel_context_is_parent(ce)) { bitmap_release_region(guc->submission_state.guc_ids_bitmap, ce->guc_id.id, order_base_2(ce->parallel.number_children + 1)); - else + } else { + --guc->submission_state.guc_ids_in_use; ida_simple_remove(&guc->submission_state.guc_ids, ce->guc_id.id); + } clr_ctx_id_mapping(guc, ce->guc_id.id); set_context_guc_id_invalid(ce); } @@ -2993,41 +3004,98 @@ guc_context_revoke(struct intel_context *ce, struct i915_request *rq, } } -static void guc_context_sched_disable(struct intel_context *ce) +static void guc_context_sched_disable(struct intel_context *ce); + +static void do_sched_disable(struct intel_guc *guc, struct intel_context *ce, + unsigned long flags) + __releases(ce->guc_state.lock) { - struct intel_guc *guc = ce_to_guc(ce); - unsigned long flags; struct intel_runtime_pm *runtime_pm = &ce->engine->gt->i915->runtime_pm; intel_wakeref_t wakeref; - u16 guc_id; + lockdep_assert_held(&ce->guc_state.lock); + + spin_unlock_irqrestore(&ce->guc_state.lock, flags); + + with_intel_runtime_pm(runtime_pm, wakeref) + guc_context_sched_disable(ce); +} + +static bool bypass_sched_disable(struct intel_guc *guc, + struct intel_context *ce) +{ + lockdep_assert_held(&ce->guc_state.lock); GEM_BUG_ON(intel_context_is_child(ce)); + if (submission_disabled(guc) || context_guc_id_invalid(ce) || + !ctx_id_mapped(guc, ce->guc_id.id)) { + clr_context_enabled(ce); + return true; + } + + return !context_enabled(ce); +} + +static void __delay_sched_disable(struct work_struct *wrk) +{ + struct intel_context *ce = + container_of(wrk, typeof(*ce), guc_state.sched_disable_delay.work); + struct intel_guc *guc = ce_to_guc(ce); + unsigned long flags; + spin_lock_irqsave(&ce->guc_state.lock, flags); - /* - * We have to check if the context has been disabled by another thread, - * check if submssion has been disabled to seal a race with reset and - * finally check if any more requests have been committed to the - * context ensursing that a request doesn't slip through the - * 'context_pending_disable' fence. - */ - if (unlikely(!context_enabled(ce) || submission_disabled(guc) || - context_has_committed_requests(ce))) { - clr_context_enabled(ce); + if (bypass_sched_disable(guc, ce)) { spin_unlock_irqrestore(&ce->guc_state.lock, flags); - goto unpin; + intel_context_sched_disable_unpin(ce); + } else { + do_sched_disable(guc, ce, flags); } - guc_id = prep_context_pending_disable(ce); +} - spin_unlock_irqrestore(&ce->guc_state.lock, flags); +static bool guc_id_pressure(struct intel_guc *guc, struct intel_context *ce) +{ + /* + * parent contexts are perma-pinned, if we are unpinning do schedule + * disable immediately. + */ + if (intel_context_is_parent(ce)) + return true; - with_intel_runtime_pm(runtime_pm, wakeref) - __guc_context_sched_disable(guc, ce, guc_id); + /* + * If we are beyond the threshold for avail guc_ids, do schedule disable immediately. + */ + return guc->submission_state.guc_ids_in_use > + guc->submission_state.sched_disable_gucid_threshold; +} + +static void guc_context_sched_disable(struct intel_context *ce) +{ + struct intel_guc *guc = ce_to_guc(ce); + u64 delay = guc->submission_state.sched_disable_delay_ms; + unsigned long flags; + + spin_lock_irqsave(&ce->guc_state.lock, flags); + + if (bypass_sched_disable(guc, ce)) { + spin_unlock_irqrestore(&ce->guc_state.lock, flags); + intel_context_sched_disable_unpin(ce); + } else if (!intel_context_is_closed(ce) && !guc_id_pressure(guc, ce) && + delay) { + spin_unlock_irqrestore(&ce->guc_state.lock, flags); + mod_delayed_work(system_unbound_wq, + &ce->guc_state.sched_disable_delay, + msecs_to_jiffies(delay)); + } else { + do_sched_disable(guc, ce, flags); + } +} - return; -unpin: - intel_context_sched_disable_unpin(ce); +static void guc_context_close(struct intel_context *ce) +{ + if (test_bit(CONTEXT_GUC_INIT, &ce->flags) && + cancel_delayed_work(&ce->guc_state.sched_disable_delay)) + __delay_sched_disable(&ce->guc_state.sched_disable_delay.work); } static inline void guc_lrc_desc_unpin(struct intel_context *ce) @@ -3346,6 +3414,8 @@ static void remove_from_context(struct i915_request *rq) static const struct intel_context_ops guc_context_ops = { .alloc = guc_context_alloc, + .close = guc_context_close, + .pre_pin = guc_context_pre_pin, .pin = guc_context_pin, .unpin = guc_context_unpin, @@ -3428,6 +3498,10 @@ static void guc_context_init(struct intel_context *ce) rcu_read_unlock(); ce->guc_state.prio = map_i915_prio_to_guc_prio(prio); + + INIT_DELAYED_WORK(&ce->guc_state.sched_disable_delay, + __delay_sched_disable); + set_bit(CONTEXT_GUC_INIT, &ce->flags); } @@ -3465,6 +3539,9 @@ static int guc_request_alloc(struct i915_request *rq) if (unlikely(!test_bit(CONTEXT_GUC_INIT, &ce->flags))) guc_context_init(ce); + if (cancel_delayed_work(&ce->guc_state.sched_disable_delay)) + intel_context_sched_disable_unpin(ce); + /* * Call pin_guc_id here rather than in the pinning step as with * dma_resv, contexts can be repeatedly pinned / unpinned trashing the @@ -3595,6 +3672,8 @@ static int guc_virtual_context_alloc(struct intel_context *ce) static const struct intel_context_ops virtual_guc_context_ops = { .alloc = guc_virtual_context_alloc, + .close = guc_context_close, + .pre_pin = guc_virtual_context_pre_pin, .pin = guc_virtual_context_pin, .unpin = guc_virtual_context_unpin, @@ -3684,6 +3763,8 @@ static void guc_child_context_destroy(struct kref *kref) static const struct intel_context_ops virtual_parent_context_ops = { .alloc = guc_virtual_context_alloc, + .close = guc_context_close, + .pre_pin = guc_context_pre_pin, .pin = guc_parent_context_pin, .unpin = guc_parent_context_unpin, @@ -4207,6 +4288,26 @@ static bool __guc_submission_selected(struct intel_guc *guc) return i915->params.enable_guc & ENABLE_GUC_SUBMISSION; } +int intel_guc_sched_disable_gucid_threshold_max(struct intel_guc *guc) +{ + return guc->submission_state.num_guc_ids - NUMBER_MULTI_LRC_GUC_ID(guc); +} + +/* + * This default value of 33 milisecs (+1 milisec round up) ensures 30fps or higher + * workloads are able to enjoy the latency reduction when delaying the schedule-disable + * operation. This matches the 30fps game-render + encode (real world) workload this + * knob was tested against. + */ +#define SCHED_DISABLE_DELAY_MS 34 + +/* + * A threshold of 75% is a reasonable starting point considering that real world apps + * generally don't get anywhere near this. + */ +#define NUM_SCHED_DISABLE_GUCIDS_DEFAULT_THRESHOLD(__guc) \ + (((intel_guc_sched_disable_gucid_threshold_max(guc)) * 3) / 4) + void intel_guc_submission_init_early(struct intel_guc *guc) { xa_init_flags(&guc->context_lookup, XA_FLAGS_LOCK_IRQ); @@ -4223,7 +4324,10 @@ void intel_guc_submission_init_early(struct intel_guc *guc) spin_lock_init(&guc->timestamp.lock); INIT_DELAYED_WORK(&guc->timestamp.work, guc_timestamp_ping); + guc->submission_state.sched_disable_delay_ms = SCHED_DISABLE_DELAY_MS; guc->submission_state.num_guc_ids = GUC_MAX_CONTEXT_ID; + guc->submission_state.sched_disable_gucid_threshold = + NUM_SCHED_DISABLE_GUCIDS_DEFAULT_THRESHOLD(guc); guc->submission_supported = __guc_submission_supported(guc); guc->submission_selected = __guc_submission_selected(guc); } diff --git a/drivers/gpu/drm/i915/i915_selftest.h b/drivers/gpu/drm/i915/i915_selftest.h index f54de0499be7..bdf3e22c0a34 100644 --- a/drivers/gpu/drm/i915/i915_selftest.h +++ b/drivers/gpu/drm/i915/i915_selftest.h @@ -92,12 +92,14 @@ int __i915_subtests(const char *caller, T, ARRAY_SIZE(T), data) #define i915_live_subtests(T, data) ({ \ typecheck(struct drm_i915_private *, data); \ + (data)->gt[0]->uc.guc.submission_state.sched_disable_delay_ms = 0; \ __i915_subtests(__func__, \ __i915_live_setup, __i915_live_teardown, \ T, ARRAY_SIZE(T), data); \ }) #define intel_gt_live_subtests(T, data) ({ \ typecheck(struct intel_gt *, data); \ + (data)->uc.guc.submission_state.sched_disable_delay_ms = 0; \ __i915_subtests(__func__, \ __intel_gt_live_setup, __intel_gt_live_teardown, \ T, ARRAY_SIZE(T), data); \