From patchwork Thu Jun 16 22:13:47 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: 12884954 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 0669FC433EF for ; Thu, 16 Jun 2022 22:13:56 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 6562010E6F0; Thu, 16 Jun 2022 22:13:56 +0000 (UTC) Received: from mga03.intel.com (mga03.intel.com [134.134.136.65]) by gabe.freedesktop.org (Postfix) with ESMTPS id 63C6210E6F0 for ; Thu, 16 Jun 2022 22:13:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1655417635; x=1686953635; h=from:to:cc:subject:date:message-id:mime-version: content-transfer-encoding; bh=PwHwZQZxxRiU6a2sOSkmCCllzT8aWNUoLzLGTjEprk4=; b=E9isjmYpE400uVgSs3HOQ1P7+tIDNZeJ3llkjDV9vVbTOPWlZs13/6ku DP4mMYNHXtYMgG5o33TulKjIhZnBluVwwYYpMY3wz3dvqXMPMr/3Rno3m dVQXzNr0HSt4bl/J4bnNNFFk+G0B+s6dw/DzqBq8Nr8Z8Ir7K6/VInFXl VZNmDFd71rNFPt+J4dOwhE0ZiLZgG0Ww7OCK3G1R+bD7SKSWA80m+48jl cHwRT9zvh3mIRs8/rVFaPMlwMi6InjRVmRVh5cmZ24SsmLK8q2NPeIWut MZ4WZTVO39LeOa3ZoVYyVLCy5DW9RWnU+eZDPxLNmmQ4XyMuYI1PpTl8y A==; X-IronPort-AV: E=McAfee;i="6400,9594,10380"; a="280396736" X-IronPort-AV: E=Sophos;i="5.92,306,1650956400"; d="scan'208";a="280396736" Received: from fmsmga004.fm.intel.com ([10.253.24.48]) by orsmga103.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 16 Jun 2022 15:13:54 -0700 X-IronPort-AV: E=Sophos;i="5.92,306,1650956400"; d="scan'208";a="653355759" Received: from dut042-dg2frd.fm.intel.com ([10.105.19.4]) by fmsmga004-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 16 Jun 2022 15:13:54 -0700 From: "Nerlige Ramappa, Umesh" To: intel-gfx@lists.freedesktop.org Date: Thu, 16 Jun 2022 22:13:47 +0000 Message-Id: <20220616221347.27621-1-umesh.nerlige.ramappa@intel.com> X-Mailer: git-send-email 2.25.1 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. 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/ Signed-off-by: John Harrison Signed-off-by: Umesh Nerlige Ramappa --- 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 4070cb5711d8..4a84146710e0 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 b7d3214d2cdd..5fc7c19ab29b 100644 --- a/drivers/gpu/drm/i915/gt/intel_context.h +++ b/drivers/gpu/drm/i915/gt/intel_context.h @@ -56,7 +56,7 @@ 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) @@ -116,7 +116,7 @@ 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); } @@ -351,7 +351,7 @@ 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 09f82545789f..797bb4242c18 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 (*ban)(struct intel_context *ce, struct i915_request *rq); @@ -55,6 +58,8 @@ 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); @@ -146,6 +151,7 @@ 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 b3c9a9327f76..6231ad03e4eb 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 5a1dfacf24ea..cbf3cbb983ce 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; } @@ -1323,13 +1323,16 @@ 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; /* @@ -1343,6 +1346,10 @@ 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, @@ -1405,6 +1412,56 @@ 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) { @@ -2585,6 +2642,7 @@ 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); @@ -3183,6 +3241,7 @@ 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, @@ -3199,6 +3258,8 @@ 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, @@ -3432,6 +3493,7 @@ 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, @@ -3447,6 +3509,7 @@ 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 18d38cb59923..118db6f03f15 100644 --- a/drivers/gpu/drm/i915/i915_drm_client.c +++ b/drivers/gpu/drm/i915/i915_drm_client.c @@ -146,11 +146,7 @@ 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++)