From patchwork Thu Jan 16 22:24:26 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Lucas De Marchi X-Patchwork-Id: 13942367 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 0498FC02183 for ; Thu, 16 Jan 2025 22:25:05 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 8715710EA18; Thu, 16 Jan 2025 22:25:05 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (2048-bit key; unprotected) header.d=intel.com header.i=@intel.com header.b="HtYLjnRa"; dkim-atps=neutral Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.18]) by gabe.freedesktop.org (Postfix) with ESMTPS id 9A70D10EA18 for ; Thu, 16 Jan 2025 22:25:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1737066305; x=1768602305; h=from:to:cc:subject:date:message-id:mime-version: content-transfer-encoding; bh=ju1+eBwNTARfEK0QjURpqM8Tyao6+eCkUcCHee3VnLw=; b=HtYLjnRaN+pgTDa5SfOtiLNzSrKYMAENLuD/wkZT+ooURvpFXmTWozdE Qmf0mVqdfOWAoWwlVZPHAQRBb1HerL4ULdzShDaC8XmYzIKLjsmvAFP2c k0/bpp/wCTuSCQzJMbShUQqKHXTDeOTjNE4QCXSrG7EwE83yllQqS2fpX nyH/BuWzDcvulZCzlgpHCOTq45xhbuuFvqHhqX+5DC22ev9rDLxGo67p2 LnlAqiviEonvEp8IkBhMwIj8lqTPlSBUi4TsZ8tXlYur4bRD7WjICVa0Y 0MjsDuYHMS0AeG6jCV4CJ0flZe6tLe8mnJ3IqoBX6h4twEshzh6tqR9/f A==; X-CSE-ConnectionGUID: EocML8+kT6eviQJ4x475Lg== X-CSE-MsgGUID: NbZ+I3dmSAuQWEWbAMJ8yQ== X-IronPort-AV: E=McAfee;i="6700,10204,11317"; a="36758416" X-IronPort-AV: E=Sophos;i="6.13,210,1732608000"; d="scan'208";a="36758416" Received: from orviesa008.jf.intel.com ([10.64.159.148]) by fmvoesa112.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 16 Jan 2025 14:25:04 -0800 X-CSE-ConnectionGUID: TJaUs1MDRRCGj1QvHtFuzA== X-CSE-MsgGUID: Pz85denqS4aWJHj4IYTSMA== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.12,224,1728975600"; d="scan'208";a="106510206" Received: from lucas-s2600cw.jf.intel.com ([10.165.21.196]) by orviesa008-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 16 Jan 2025 14:25:04 -0800 From: Lucas De Marchi To: intel-gfx@lists.freedesktop.org Cc: Lucas De Marchi , Kan Liang , "Peter Zijlstra (Intel)" , Vinay Belgaumkar Subject: [PATCH] drm/i915/pmu: Drop custom hotplug code Date: Thu, 16 Jan 2025 14:24:26 -0800 Message-ID: <20250116222426.77757-1-lucas.demarchi@intel.com> X-Mailer: git-send-email 2.48.0 MIME-Version: 1.0 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" Since commit 4ba4f1afb6a9 ("perf: Generic hotplug support for a PMU with a scope"), there's generic support for system-wide counters and integration with cpu hotplug. Set our scope to PERF_PMU_SCOPE_SYS_WIDE instead of all the boilerplate code for handling hotplug. Cc: Kan Liang Cc: Peter Zijlstra (Intel) Cc: Vinay Belgaumkar Signed-off-by: Lucas De Marchi --- drivers/gpu/drm/i915/i915_module.c | 2 - drivers/gpu/drm/i915/i915_pmu.c | 114 +---------------------------- drivers/gpu/drm/i915/i915_pmu.h | 11 --- 3 files changed, 1 insertion(+), 126 deletions(-) diff --git a/drivers/gpu/drm/i915/i915_module.c b/drivers/gpu/drm/i915/i915_module.c index 7ed6d70389af9..7affe07f84f45 100644 --- a/drivers/gpu/drm/i915/i915_module.c +++ b/drivers/gpu/drm/i915/i915_module.c @@ -71,8 +71,6 @@ static const struct { { .init = i915_vma_resource_module_init, .exit = i915_vma_resource_module_exit }, { .init = i915_mock_selftests }, - { .init = i915_pmu_init, - .exit = i915_pmu_exit }, { .init = i915_pci_register_driver, .exit = i915_pci_unregister_driver }, { .init = i915_perf_sysctl_register, diff --git a/drivers/gpu/drm/i915/i915_pmu.c b/drivers/gpu/drm/i915/i915_pmu.c index e55db036be1bb..652964ef0643c 100644 --- a/drivers/gpu/drm/i915/i915_pmu.c +++ b/drivers/gpu/drm/i915/i915_pmu.c @@ -28,9 +28,6 @@ BIT(I915_SAMPLE_WAIT) | \ BIT(I915_SAMPLE_SEMA)) -static cpumask_t i915_pmu_cpumask; -static unsigned int i915_pmu_target_cpu = -1; - static struct i915_pmu *event_to_pmu(struct perf_event *event) { return container_of(event->pmu, struct i915_pmu, base); @@ -642,10 +639,6 @@ static int i915_pmu_event_init(struct perf_event *event) if (event->cpu < 0) return -EINVAL; - /* only allow running on one cpu at a time */ - if (!cpumask_test_cpu(event->cpu, &i915_pmu_cpumask)) - return -EINVAL; - if (is_engine_event(event)) ret = engine_event_init(event); else @@ -940,23 +933,6 @@ static ssize_t i915_pmu_event_show(struct device *dev, return sprintf(buf, "config=0x%lx\n", eattr->val); } -static ssize_t cpumask_show(struct device *dev, - struct device_attribute *attr, char *buf) -{ - return cpumap_print_to_pagebuf(true, buf, &i915_pmu_cpumask); -} - -static DEVICE_ATTR_RO(cpumask); - -static struct attribute *i915_cpumask_attrs[] = { - &dev_attr_cpumask.attr, - NULL, -}; - -static const struct attribute_group i915_pmu_cpumask_attr_group = { - .attrs = i915_cpumask_attrs, -}; - #define __event(__counter, __name, __unit) \ { \ .counter = (__counter), \ @@ -1173,92 +1149,12 @@ static void free_event_attributes(struct i915_pmu *pmu) pmu->pmu_attr = NULL; } -static int i915_pmu_cpu_online(unsigned int cpu, struct hlist_node *node) -{ - struct i915_pmu *pmu = hlist_entry_safe(node, typeof(*pmu), cpuhp.node); - - /* Select the first online CPU as a designated reader. */ - if (cpumask_empty(&i915_pmu_cpumask)) - cpumask_set_cpu(cpu, &i915_pmu_cpumask); - - return 0; -} - -static int i915_pmu_cpu_offline(unsigned int cpu, struct hlist_node *node) -{ - struct i915_pmu *pmu = hlist_entry_safe(node, typeof(*pmu), cpuhp.node); - unsigned int target = i915_pmu_target_cpu; - - /* - * Unregistering an instance generates a CPU offline event which we must - * ignore to avoid incorrectly modifying the shared i915_pmu_cpumask. - */ - if (!pmu->registered) - return 0; - - if (cpumask_test_and_clear_cpu(cpu, &i915_pmu_cpumask)) { - target = cpumask_any_but(topology_sibling_cpumask(cpu), cpu); - - /* Migrate events if there is a valid target */ - if (target < nr_cpu_ids) { - cpumask_set_cpu(target, &i915_pmu_cpumask); - i915_pmu_target_cpu = target; - } - } - - if (target < nr_cpu_ids && target != pmu->cpuhp.cpu) { - perf_pmu_migrate_context(&pmu->base, cpu, target); - pmu->cpuhp.cpu = target; - } - - return 0; -} - -static enum cpuhp_state cpuhp_state = CPUHP_INVALID; - -int i915_pmu_init(void) -{ - int ret; - - ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, - "perf/x86/intel/i915:online", - i915_pmu_cpu_online, - i915_pmu_cpu_offline); - if (ret < 0) - pr_notice("Failed to setup cpuhp state for i915 PMU! (%d)\n", - ret); - else - cpuhp_state = ret; - - return 0; -} - -void i915_pmu_exit(void) -{ - if (cpuhp_state != CPUHP_INVALID) - cpuhp_remove_multi_state(cpuhp_state); -} - -static int i915_pmu_register_cpuhp_state(struct i915_pmu *pmu) -{ - if (cpuhp_state == CPUHP_INVALID) - return -EINVAL; - - return cpuhp_state_add_instance(cpuhp_state, &pmu->cpuhp.node); -} - -static void i915_pmu_unregister_cpuhp_state(struct i915_pmu *pmu) -{ - cpuhp_state_remove_instance(cpuhp_state, &pmu->cpuhp.node); -} - void i915_pmu_register(struct drm_i915_private *i915) { struct i915_pmu *pmu = &i915->pmu; const struct attribute_group *attr_groups[] = { &i915_pmu_format_attr_group, &pmu->events_attr_group, - &i915_pmu_cpumask_attr_group, NULL }; int ret = -ENOMEM; @@ -1266,7 +1162,6 @@ void i915_pmu_register(struct drm_i915_private *i915) spin_lock_init(&pmu->lock); hrtimer_init(&pmu->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); pmu->timer.function = i915_sample; - pmu->cpuhp.cpu = -1; init_rc6(pmu); if (IS_DGFX(i915)) { @@ -1295,6 +1190,7 @@ void i915_pmu_register(struct drm_i915_private *i915) pmu->base.module = THIS_MODULE; pmu->base.task_ctx_nr = perf_invalid_context; + pmu->base.scope = PERF_PMU_SCOPE_SYS_WIDE; pmu->base.event_init = i915_pmu_event_init; pmu->base.add = i915_pmu_event_add; pmu->base.del = i915_pmu_event_del; @@ -1307,16 +1203,10 @@ void i915_pmu_register(struct drm_i915_private *i915) if (ret) goto err_groups; - ret = i915_pmu_register_cpuhp_state(pmu); - if (ret) - goto err_unreg; - pmu->registered = true; return; -err_unreg: - perf_pmu_unregister(&pmu->base); err_groups: kfree(pmu->base.attr_groups); err_attr: @@ -1340,8 +1230,6 @@ void i915_pmu_unregister(struct drm_i915_private *i915) hrtimer_cancel(&pmu->timer); - i915_pmu_unregister_cpuhp_state(pmu); - perf_pmu_unregister(&pmu->base); kfree(pmu->base.attr_groups); if (IS_DGFX(i915)) diff --git a/drivers/gpu/drm/i915/i915_pmu.h b/drivers/gpu/drm/i915/i915_pmu.h index 8e66d63d0c9f9..53bce3d8bfbaf 100644 --- a/drivers/gpu/drm/i915/i915_pmu.h +++ b/drivers/gpu/drm/i915/i915_pmu.h @@ -56,13 +56,6 @@ struct i915_pmu_sample { }; struct i915_pmu { - /** - * @cpuhp: Struct used for CPU hotplug handling. - */ - struct { - struct hlist_node node; - unsigned int cpu; - } cpuhp; /** * @base: PMU base. */ @@ -155,15 +148,11 @@ struct i915_pmu { }; #ifdef CONFIG_PERF_EVENTS -int i915_pmu_init(void); -void i915_pmu_exit(void); void i915_pmu_register(struct drm_i915_private *i915); void i915_pmu_unregister(struct drm_i915_private *i915); void i915_pmu_gt_parked(struct intel_gt *gt); void i915_pmu_gt_unparked(struct intel_gt *gt); #else -static inline int i915_pmu_init(void) { return 0; } -static inline void i915_pmu_exit(void) {} static inline void i915_pmu_register(struct drm_i915_private *i915) {} static inline void i915_pmu_unregister(struct drm_i915_private *i915) {} static inline void i915_pmu_gt_parked(struct intel_gt *gt) {}