From patchwork Thu Aug 4 23:21:25 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Umesh Nerlige Ramappa X-Patchwork-Id: 12936803 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 A690EC25B06 for ; Thu, 4 Aug 2022 23:22:00 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id AA65A113284; Thu, 4 Aug 2022 23:21:55 +0000 (UTC) Received: from mga17.intel.com (mga17.intel.com [192.55.52.151]) by gabe.freedesktop.org (Postfix) with ESMTPS id 310D4A1F1D for ; Thu, 4 Aug 2022 23:21:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1659655293; x=1691191293; h=from:to:subject:date:message-id:mime-version: content-transfer-encoding; bh=DJDNDHDM0AA7+/A70FPAcAxarn755Uooi2lcFloYpeY=; b=gpgkRLJF8JhSahYdHCNuV1mni3mEMROABSDkJJQ0E/wDs3OQFL5p9JEr IcBZztzSA9ERUcEBlXJJBOrsmgIQzeJJZfiHcpq8qGSwmpmR8O5wrN60x poXjr/zkF0wz647ufXAiNqeD4Dvk8GhWgFP+xCSPLv6/wWdkrO0OCea1C t2jNoHWFP6uO7xujoiTdsRMddq6W0ovJz1705TDRdTV2SbRhlVzsB39YN Jwid7T7mXyDNxGm9rsSXyhLhuxrt2PseRUPsLly4mGr6KQBNiG92NGBVf yPfWkhhpKJUtGlCIDDoDSNTo4yXyNc3SZqGMl5XcqWKUzjC/fvbXNrvPb Q==; X-IronPort-AV: E=McAfee;i="6400,9594,10429"; a="270459192" X-IronPort-AV: E=Sophos;i="5.93,216,1654585200"; d="scan'208";a="270459192" Received: from orsmga008.jf.intel.com ([10.7.209.65]) by fmsmga107.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 04 Aug 2022 16:21:31 -0700 X-IronPort-AV: E=Sophos;i="5.93,216,1654585200"; d="scan'208";a="631793509" Received: from unerlige-desk.jf.intel.com ([10.165.21.210]) by orsmga008-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 04 Aug 2022 16:21:31 -0700 From: Umesh Nerlige Ramappa To: intel-gfx@lists.freedesktop.org, Tvrtko Ursulin Date: Thu, 4 Aug 2022 16:21:25 -0700 Message-Id: <20220804232125.211449-1-umesh.nerlige.ramappa@intel.com> X-Mailer: git-send-email 2.37.1 MIME-Version: 1.0 Subject: [Intel-gfx] [PATCH] i915/pmu: Wire GuC backend to per-client busyness 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: John Harrison GuC provides engine_id and last_switch_in ticks for an active context in the pphwsp. The context image provides a 32 bit total ticks which is the accumulated by the context (a.k.a. context[CTX_TIMESTAMP]). This information is used to calculate the context busyness as follows: If the engine_id is valid, then busyness is the sum of accumulated total ticks and active ticks. Active ticks is calculated with current gt time as reference. If engine_id is invalid, busyness is equal to accumulated total ticks. Since KMD (CPU) retrieves busyness data from 2 sources - GPU and GuC, a potential race was highlighted in an earlier review that can lead to double accounting of busyness. While the solution to this is a wip, busyness is still usable for platforms running GuC submission. Remaining work: Enable and test context busyness for virtual_parent_context_ops and virtual_child_context_ops. v2: (Tvrtko) - Use COPS_RUNTIME_ACTIVE_TOTAL - Add code comment for the race - Undo local variables initializations v3: - Add support for virtual engines based on https://patchwork.freedesktop.org/series/105227/ v4: - Update commit message with remaining work. - Rebase Signed-off-by: John Harrison Signed-off-by: Umesh Nerlige Ramappa Acked-by: Tvrtko Ursulin --- drivers/gpu/drm/i915/gt/intel_context.c | 12 +++- drivers/gpu/drm/i915/gt/intel_context.h | 6 +- drivers/gpu/drm/i915/gt/intel_context_types.h | 6 ++ drivers/gpu/drm/i915/gt/uc/intel_guc_fwif.h | 5 ++ .../gpu/drm/i915/gt/uc/intel_guc_submission.c | 65 ++++++++++++++++++- drivers/gpu/drm/i915/i915_drm_client.c | 6 +- 6 files changed, 89 insertions(+), 11 deletions(-) diff --git a/drivers/gpu/drm/i915/gt/intel_context.c b/drivers/gpu/drm/i915/gt/intel_context.c index 654a092ed3d6..e2d70a9fdac0 100644 --- a/drivers/gpu/drm/i915/gt/intel_context.c +++ b/drivers/gpu/drm/i915/gt/intel_context.c @@ -576,16 +576,24 @@ void intel_context_bind_parent_child(struct intel_context *parent, child->parallel.parent = parent; } -u64 intel_context_get_total_runtime_ns(const struct intel_context *ce) +u64 intel_context_get_total_runtime_ns(struct intel_context *ce) { u64 total, active; + if (ce->ops->update_stats) + ce->ops->update_stats(ce); + total = ce->stats.runtime.total; if (ce->ops->flags & COPS_RUNTIME_CYCLES) total *= ce->engine->gt->clock_period_ns; active = READ_ONCE(ce->stats.active); - if (active) + /* + * When COPS_RUNTIME_ACTIVE_TOTAL is set for ce->cops, the backend + * already provides the total active time of the context, so skip this + * calculation when this flag is set. + */ + if (active && !(ce->ops->flags & COPS_RUNTIME_ACTIVE_TOTAL)) active = intel_context_clock() - active; return total + active; diff --git a/drivers/gpu/drm/i915/gt/intel_context.h b/drivers/gpu/drm/i915/gt/intel_context.h index 8e2d70630c49..3d1d7436c1a4 100644 --- a/drivers/gpu/drm/i915/gt/intel_context.h +++ b/drivers/gpu/drm/i915/gt/intel_context.h @@ -58,7 +58,7 @@ static inline bool intel_context_is_parent(struct intel_context *ce) return !!ce->parallel.number_children; } -static inline bool intel_context_is_pinned(struct intel_context *ce); +static inline bool intel_context_is_pinned(const struct intel_context *ce); static inline struct intel_context * intel_context_to_parent(struct intel_context *ce) @@ -118,7 +118,7 @@ static inline int intel_context_lock_pinned(struct intel_context *ce) * Returns: true if the context is currently pinned for use by the GPU. */ static inline bool -intel_context_is_pinned(struct intel_context *ce) +intel_context_is_pinned(const struct intel_context *ce) { return atomic_read(&ce->pin_count); } @@ -362,7 +362,7 @@ intel_context_clear_nopreempt(struct intel_context *ce) clear_bit(CONTEXT_NOPREEMPT, &ce->flags); } -u64 intel_context_get_total_runtime_ns(const struct intel_context *ce); +u64 intel_context_get_total_runtime_ns(struct intel_context *ce); u64 intel_context_get_avg_runtime_ns(struct intel_context *ce); static inline u64 intel_context_clock(void) diff --git a/drivers/gpu/drm/i915/gt/intel_context_types.h b/drivers/gpu/drm/i915/gt/intel_context_types.h index 04eacae1aca5..f7ff4c7d81c7 100644 --- a/drivers/gpu/drm/i915/gt/intel_context_types.h +++ b/drivers/gpu/drm/i915/gt/intel_context_types.h @@ -38,6 +38,9 @@ struct intel_context_ops { #define COPS_RUNTIME_CYCLES_BIT 1 #define COPS_RUNTIME_CYCLES BIT(COPS_RUNTIME_CYCLES_BIT) +#define COPS_RUNTIME_ACTIVE_TOTAL_BIT 2 +#define COPS_RUNTIME_ACTIVE_TOTAL BIT(COPS_RUNTIME_ACTIVE_TOTAL_BIT) + int (*alloc)(struct intel_context *ce); void (*revoke)(struct intel_context *ce, struct i915_request *rq, @@ -56,6 +59,8 @@ struct intel_context_ops { void (*sched_disable)(struct intel_context *ce); + void (*update_stats)(struct intel_context *ce); + void (*reset)(struct intel_context *ce); void (*destroy)(struct kref *kref); @@ -148,6 +153,7 @@ struct intel_context { struct ewma_runtime avg; u64 total; u32 last; + u64 start_gt_clk; I915_SELFTEST_DECLARE(u32 num_underflow); I915_SELFTEST_DECLARE(u32 max_underflow); } runtime; diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_fwif.h b/drivers/gpu/drm/i915/gt/uc/intel_guc_fwif.h index 323b055e5db9..c7b54f1631b9 100644 --- a/drivers/gpu/drm/i915/gt/uc/intel_guc_fwif.h +++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_fwif.h @@ -196,6 +196,11 @@ static inline u8 guc_class_to_engine_class(u8 guc_class) return guc_class_engine_class_map[guc_class]; } +/* Per context engine usage stats: */ +#define PPHWSP_GUC_CONTEXT_USAGE_STAMP_LO (0x500 / sizeof(u32)) +#define PPHWSP_GUC_CONTEXT_USAGE_STAMP_HI (PPHWSP_GUC_CONTEXT_USAGE_STAMP_LO + 1) +#define PPHWSP_GUC_CONTEXT_USAGE_ENGINE_ID (PPHWSP_GUC_CONTEXT_USAGE_STAMP_HI + 1) + /* Work item for submitting workloads into work queue of GuC. */ struct guc_wq_item { u32 header; 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..c9fefa254a7e 100644 --- a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c +++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c @@ -378,7 +378,7 @@ static inline void set_context_guc_id_invalid(struct intel_context *ce) ce->guc_id.id = GUC_INVALID_CONTEXT_ID; } -static inline struct intel_guc *ce_to_guc(struct intel_context *ce) +static inline struct intel_guc *ce_to_guc(const struct intel_context *ce) { return &ce->engine->gt->uc.guc; } @@ -1376,13 +1376,16 @@ static void __update_guc_busyness_stats(struct intel_guc *guc) spin_unlock_irqrestore(&guc->timestamp.lock, flags); } +static void __guc_context_update_clks(struct intel_context *ce); static void guc_timestamp_ping(struct work_struct *wrk) { struct intel_guc *guc = container_of(wrk, typeof(*guc), timestamp.work.work); struct intel_uc *uc = container_of(guc, typeof(*uc), guc); struct intel_gt *gt = guc_to_gt(guc); + struct intel_context *ce; intel_wakeref_t wakeref; + unsigned long index; int srcu, ret; /* @@ -1396,6 +1399,10 @@ static void guc_timestamp_ping(struct work_struct *wrk) with_intel_runtime_pm(>->i915->runtime_pm, wakeref) __update_guc_busyness_stats(guc); + /* adjust context stats for overflow */ + xa_for_each(&guc->context_lookup, index, ce) + __guc_context_update_clks(ce); + intel_gt_reset_unlock(gt, srcu); mod_delayed_work(system_highpri_wq, &guc->timestamp.work, @@ -1469,6 +1476,56 @@ void intel_guc_busyness_unpark(struct intel_gt *gt) guc->timestamp.ping_delay); } +static void __guc_context_update_clks(struct intel_context *ce) +{ + struct intel_guc *guc = ce_to_guc(ce); + struct intel_gt *gt = ce->engine->gt; + u32 *pphwsp, last_switch, engine_id; + u64 start_gt_clk, active; + unsigned long flags; + ktime_t unused; + + spin_lock_irqsave(&guc->timestamp.lock, flags); + + /* + * GPU updates ce->lrc_reg_state[CTX_TIMESTAMP] when context is switched + * out, however GuC updates PPHWSP offsets below. Hence KMD (CPU) + * relies on GuC and GPU for busyness calculations. Due to this, A + * potential race was highlighted in an earlier review that can lead to + * double accounting of busyness. While the solution to this is a wip, + * busyness is still usable for platforms running GuC submission. + */ + pphwsp = ((void *)ce->lrc_reg_state) - LRC_STATE_OFFSET; + last_switch = READ_ONCE(pphwsp[PPHWSP_GUC_CONTEXT_USAGE_STAMP_LO]); + engine_id = READ_ONCE(pphwsp[PPHWSP_GUC_CONTEXT_USAGE_ENGINE_ID]); + + guc_update_pm_timestamp(guc, &unused); + + if (engine_id != 0xffffffff && last_switch) { + start_gt_clk = READ_ONCE(ce->stats.runtime.start_gt_clk); + __extend_last_switch(guc, &start_gt_clk, last_switch); + active = intel_gt_clock_interval_to_ns(gt, guc->timestamp.gt_stamp - start_gt_clk); + WRITE_ONCE(ce->stats.runtime.start_gt_clk, start_gt_clk); + WRITE_ONCE(ce->stats.active, active); + } else { + lrc_update_runtime(ce); + } + + spin_unlock_irqrestore(&guc->timestamp.lock, flags); +} + +static void guc_context_update_stats(struct intel_context *ce) +{ + if (!intel_context_pin_if_active(ce)) { + WRITE_ONCE(ce->stats.runtime.start_gt_clk, 0); + WRITE_ONCE(ce->stats.active, 0); + return; + } + + __guc_context_update_clks(ce); + intel_context_unpin(ce); +} + static inline bool submission_disabled(struct intel_guc *guc) { @@ -2723,6 +2780,7 @@ static void guc_context_unpin(struct intel_context *ce) { struct intel_guc *guc = ce_to_guc(ce); + lrc_update_runtime(ce); unpin_guc_id(guc, ce); lrc_unpin(ce); @@ -3344,6 +3402,7 @@ static void remove_from_context(struct i915_request *rq) } static const struct intel_context_ops guc_context_ops = { + .flags = COPS_RUNTIME_CYCLES | COPS_RUNTIME_ACTIVE_TOTAL, .alloc = guc_context_alloc, .pre_pin = guc_context_pre_pin, @@ -3360,6 +3419,8 @@ static const struct intel_context_ops guc_context_ops = { .sched_disable = guc_context_sched_disable, + .update_stats = guc_context_update_stats, + .reset = lrc_reset, .destroy = guc_context_destroy, @@ -3593,6 +3654,7 @@ static int guc_virtual_context_alloc(struct intel_context *ce) } static const struct intel_context_ops virtual_guc_context_ops = { + .flags = COPS_RUNTIME_CYCLES | COPS_RUNTIME_ACTIVE_TOTAL, .alloc = guc_virtual_context_alloc, .pre_pin = guc_virtual_context_pre_pin, @@ -3608,6 +3670,7 @@ static const struct intel_context_ops virtual_guc_context_ops = { .exit = guc_virtual_context_exit, .sched_disable = guc_context_sched_disable, + .update_stats = guc_context_update_stats, .destroy = guc_context_destroy, diff --git a/drivers/gpu/drm/i915/i915_drm_client.c b/drivers/gpu/drm/i915/i915_drm_client.c index b09d1d386574..8d81119fff14 100644 --- a/drivers/gpu/drm/i915/i915_drm_client.c +++ b/drivers/gpu/drm/i915/i915_drm_client.c @@ -147,11 +147,7 @@ void i915_drm_client_fdinfo(struct seq_file *m, struct file *f) PCI_SLOT(pdev->devfn), PCI_FUNC(pdev->devfn)); seq_printf(m, "drm-client-id:\t%u\n", client->id); - /* - * Temporarily skip showing client engine information with GuC submission till - * fetching engine busyness is implemented in the GuC submission backend - */ - if (GRAPHICS_VER(i915) < 8 || intel_uc_uses_guc_submission(&i915->gt0.uc)) + if (GRAPHICS_VER(i915) < 8) return; for (i = 0; i < ARRAY_SIZE(uabi_class_names); i++)