diff options
Diffstat (limited to 'drivers/gpu/drm/i915/i915_pmu.c')
| -rw-r--r-- | drivers/gpu/drm/i915/i915_pmu.c | 1096 |
1 files changed, 1096 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/i915_pmu.c b/drivers/gpu/drm/i915/i915_pmu.c new file mode 100644 index 000000000..b7fda6934 --- /dev/null +++ b/drivers/gpu/drm/i915/i915_pmu.c @@ -0,0 +1,1096 @@ +/* + * SPDX-License-Identifier: MIT + * + * Copyright © 2017-2018 Intel Corporation + */ + +#include <linux/irq.h> +#include "i915_pmu.h" +#include "intel_ringbuffer.h" +#include "i915_drv.h" + +/* Frequency for the sampling timer for events which need it. */ +#define FREQUENCY 200 +#define PERIOD max_t(u64, 10000, NSEC_PER_SEC / FREQUENCY) + +#define ENGINE_SAMPLE_MASK \ + (BIT(I915_SAMPLE_BUSY) | \ + BIT(I915_SAMPLE_WAIT) | \ + BIT(I915_SAMPLE_SEMA)) + +#define ENGINE_SAMPLE_BITS (1 << I915_PMU_SAMPLE_BITS) + +static cpumask_t i915_pmu_cpumask; + +static u8 engine_config_sample(u64 config) +{ + return config & I915_PMU_SAMPLE_MASK; +} + +static u8 engine_event_sample(struct perf_event *event) +{ + return engine_config_sample(event->attr.config); +} + +static u8 engine_event_class(struct perf_event *event) +{ + return (event->attr.config >> I915_PMU_CLASS_SHIFT) & 0xff; +} + +static u8 engine_event_instance(struct perf_event *event) +{ + return (event->attr.config >> I915_PMU_SAMPLE_BITS) & 0xff; +} + +static bool is_engine_config(u64 config) +{ + return config < __I915_PMU_OTHER(0); +} + +static unsigned int config_enabled_bit(u64 config) +{ + if (is_engine_config(config)) + return engine_config_sample(config); + else + return ENGINE_SAMPLE_BITS + (config - __I915_PMU_OTHER(0)); +} + +static u64 config_enabled_mask(u64 config) +{ + return BIT_ULL(config_enabled_bit(config)); +} + +static bool is_engine_event(struct perf_event *event) +{ + return is_engine_config(event->attr.config); +} + +static unsigned int event_enabled_bit(struct perf_event *event) +{ + return config_enabled_bit(event->attr.config); +} + +static bool pmu_needs_timer(struct drm_i915_private *i915, bool gpu_active) +{ + u64 enable; + + /* + * Only some counters need the sampling timer. + * + * We start with a bitmask of all currently enabled events. + */ + enable = i915->pmu.enable; + + /* + * Mask out all the ones which do not need the timer, or in + * other words keep all the ones that could need the timer. + */ + enable &= config_enabled_mask(I915_PMU_ACTUAL_FREQUENCY) | + config_enabled_mask(I915_PMU_REQUESTED_FREQUENCY) | + ENGINE_SAMPLE_MASK; + + /* + * When the GPU is idle per-engine counters do not need to be + * running so clear those bits out. + */ + if (!gpu_active) + enable &= ~ENGINE_SAMPLE_MASK; + /* + * Also there is software busyness tracking available we do not + * need the timer for I915_SAMPLE_BUSY counter. + * + * Use RCS as proxy for all engines. + */ + else if (intel_engine_supports_stats(i915->engine[RCS])) + enable &= ~BIT(I915_SAMPLE_BUSY); + + /* + * If some bits remain it means we need the sampling timer running. + */ + return enable; +} + +void i915_pmu_gt_parked(struct drm_i915_private *i915) +{ + if (!i915->pmu.base.event_init) + return; + + spin_lock_irq(&i915->pmu.lock); + /* + * Signal sampling timer to stop if only engine events are enabled and + * GPU went idle. + */ + i915->pmu.timer_enabled = pmu_needs_timer(i915, false); + spin_unlock_irq(&i915->pmu.lock); +} + +static void __i915_pmu_maybe_start_timer(struct drm_i915_private *i915) +{ + if (!i915->pmu.timer_enabled && pmu_needs_timer(i915, true)) { + i915->pmu.timer_enabled = true; + i915->pmu.timer_last = ktime_get(); + hrtimer_start_range_ns(&i915->pmu.timer, + ns_to_ktime(PERIOD), 0, + HRTIMER_MODE_REL_PINNED); + } +} + +void i915_pmu_gt_unparked(struct drm_i915_private *i915) +{ + if (!i915->pmu.base.event_init) + return; + + spin_lock_irq(&i915->pmu.lock); + /* + * Re-enable sampling timer when GPU goes active. + */ + __i915_pmu_maybe_start_timer(i915); + spin_unlock_irq(&i915->pmu.lock); +} + +static bool grab_forcewake(struct drm_i915_private *i915, bool fw) +{ + if (!fw) + intel_uncore_forcewake_get(i915, FORCEWAKE_ALL); + + return true; +} + +static void +add_sample(struct i915_pmu_sample *sample, u32 val) +{ + sample->cur += val; +} + +static void +engines_sample(struct drm_i915_private *dev_priv, unsigned int period_ns) +{ + struct intel_engine_cs *engine; + enum intel_engine_id id; + bool fw = false; + + if ((dev_priv->pmu.enable & ENGINE_SAMPLE_MASK) == 0) + return; + + if (!dev_priv->gt.awake) + return; + + if (!intel_runtime_pm_get_if_in_use(dev_priv)) + return; + + for_each_engine(engine, dev_priv, id) { + u32 current_seqno = intel_engine_get_seqno(engine); + u32 last_seqno = intel_engine_last_submit(engine); + u32 val; + + val = !i915_seqno_passed(current_seqno, last_seqno); + + if (val) + add_sample(&engine->pmu.sample[I915_SAMPLE_BUSY], + period_ns); + + if (val && (engine->pmu.enable & + (BIT(I915_SAMPLE_WAIT) | BIT(I915_SAMPLE_SEMA)))) { + fw = grab_forcewake(dev_priv, fw); + + val = I915_READ_FW(RING_CTL(engine->mmio_base)); + } else { + val = 0; + } + + if (val & RING_WAIT) + add_sample(&engine->pmu.sample[I915_SAMPLE_WAIT], + period_ns); + + if (val & RING_WAIT_SEMAPHORE) + add_sample(&engine->pmu.sample[I915_SAMPLE_SEMA], + period_ns); + } + + if (fw) + intel_uncore_forcewake_put(dev_priv, FORCEWAKE_ALL); + + intel_runtime_pm_put(dev_priv); +} + +static void +add_sample_mult(struct i915_pmu_sample *sample, u32 val, u32 mul) +{ + sample->cur += mul_u32_u32(val, mul); +} + +static void +frequency_sample(struct drm_i915_private *dev_priv, unsigned int period_ns) +{ + if (dev_priv->pmu.enable & + config_enabled_mask(I915_PMU_ACTUAL_FREQUENCY)) { + u32 val; + + val = dev_priv->gt_pm.rps.cur_freq; + if (dev_priv->gt.awake && + intel_runtime_pm_get_if_in_use(dev_priv)) { + val = intel_get_cagf(dev_priv, + I915_READ_NOTRACE(GEN6_RPSTAT1)); + intel_runtime_pm_put(dev_priv); + } + + add_sample_mult(&dev_priv->pmu.sample[__I915_SAMPLE_FREQ_ACT], + intel_gpu_freq(dev_priv, val), + period_ns / 1000); + } + + if (dev_priv->pmu.enable & + config_enabled_mask(I915_PMU_REQUESTED_FREQUENCY)) { + add_sample_mult(&dev_priv->pmu.sample[__I915_SAMPLE_FREQ_REQ], + intel_gpu_freq(dev_priv, + dev_priv->gt_pm.rps.cur_freq), + period_ns / 1000); + } +} + +static enum hrtimer_restart i915_sample(struct hrtimer *hrtimer) +{ + struct drm_i915_private *i915 = + container_of(hrtimer, struct drm_i915_private, pmu.timer); + unsigned int period_ns; + ktime_t now; + + if (!READ_ONCE(i915->pmu.timer_enabled)) + return HRTIMER_NORESTART; + + now = ktime_get(); + period_ns = ktime_to_ns(ktime_sub(now, i915->pmu.timer_last)); + i915->pmu.timer_last = now; + + /* + * Strictly speaking the passed in period may not be 100% accurate for + * all internal calculation, since some amount of time can be spent on + * grabbing the forcewake. However the potential error from timer call- + * back delay greatly dominates this so we keep it simple. + */ + engines_sample(i915, period_ns); + frequency_sample(i915, period_ns); + + hrtimer_forward(hrtimer, now, ns_to_ktime(PERIOD)); + + return HRTIMER_RESTART; +} + +static u64 count_interrupts(struct drm_i915_private *i915) +{ + /* open-coded kstat_irqs() */ + struct irq_desc *desc = irq_to_desc(i915->drm.pdev->irq); + u64 sum = 0; + int cpu; + + if (!desc || !desc->kstat_irqs) + return 0; + + for_each_possible_cpu(cpu) + sum += *per_cpu_ptr(desc->kstat_irqs, cpu); + + return sum; +} + +static void engine_event_destroy(struct perf_event *event) +{ + struct drm_i915_private *i915 = + container_of(event->pmu, typeof(*i915), pmu.base); + struct intel_engine_cs *engine; + + engine = intel_engine_lookup_user(i915, + engine_event_class(event), + engine_event_instance(event)); + if (WARN_ON_ONCE(!engine)) + return; + + if (engine_event_sample(event) == I915_SAMPLE_BUSY && + intel_engine_supports_stats(engine)) + intel_disable_engine_stats(engine); +} + +static void i915_pmu_event_destroy(struct perf_event *event) +{ + WARN_ON(event->parent); + + if (is_engine_event(event)) + engine_event_destroy(event); +} + +static int +engine_event_status(struct intel_engine_cs *engine, + enum drm_i915_pmu_engine_sample sample) +{ + switch (sample) { + case I915_SAMPLE_BUSY: + case I915_SAMPLE_WAIT: + break; + case I915_SAMPLE_SEMA: + if (INTEL_GEN(engine->i915) < 6) + return -ENODEV; + break; + default: + return -ENOENT; + } + + return 0; +} + +static int +config_status(struct drm_i915_private *i915, u64 config) +{ + switch (config) { + case I915_PMU_ACTUAL_FREQUENCY: + if (IS_VALLEYVIEW(i915) || IS_CHERRYVIEW(i915)) + /* Requires a mutex for sampling! */ + return -ENODEV; + /* Fall-through. */ + case I915_PMU_REQUESTED_FREQUENCY: + if (INTEL_GEN(i915) < 6) + return -ENODEV; + break; + case I915_PMU_INTERRUPTS: + break; + case I915_PMU_RC6_RESIDENCY: + if (!HAS_RC6(i915)) + return -ENODEV; + break; + default: + return -ENOENT; + } + + return 0; +} + +static int engine_event_init(struct perf_event *event) +{ + struct drm_i915_private *i915 = + container_of(event->pmu, typeof(*i915), pmu.base); + struct intel_engine_cs *engine; + u8 sample; + int ret; + + engine = intel_engine_lookup_user(i915, engine_event_class(event), + engine_event_instance(event)); + if (!engine) + return -ENODEV; + + sample = engine_event_sample(event); + ret = engine_event_status(engine, sample); + if (ret) + return ret; + + if (sample == I915_SAMPLE_BUSY && intel_engine_supports_stats(engine)) + ret = intel_enable_engine_stats(engine); + + return ret; +} + +static int i915_pmu_event_init(struct perf_event *event) +{ + struct drm_i915_private *i915 = + container_of(event->pmu, typeof(*i915), pmu.base); + int ret; + + if (event->attr.type != event->pmu->type) + return -ENOENT; + + /* unsupported modes and filters */ + if (event->attr.sample_period) /* no sampling */ + return -EINVAL; + + if (has_branch_stack(event)) + return -EOPNOTSUPP; + + 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 + ret = config_status(i915, event->attr.config); + if (ret) + return ret; + + if (!event->parent) + event->destroy = i915_pmu_event_destroy; + + return 0; +} + +static u64 __get_rc6(struct drm_i915_private *i915) +{ + u64 val; + + val = intel_rc6_residency_ns(i915, + IS_VALLEYVIEW(i915) ? + VLV_GT_RENDER_RC6 : + GEN6_GT_GFX_RC6); + + if (HAS_RC6p(i915)) + val += intel_rc6_residency_ns(i915, GEN6_GT_GFX_RC6p); + + if (HAS_RC6pp(i915)) + val += intel_rc6_residency_ns(i915, GEN6_GT_GFX_RC6pp); + + return val; +} + +static u64 get_rc6(struct drm_i915_private *i915) +{ +#if IS_ENABLED(CONFIG_PM) + unsigned long flags; + u64 val; + + if (intel_runtime_pm_get_if_in_use(i915)) { + val = __get_rc6(i915); + intel_runtime_pm_put(i915); + + /* + * If we are coming back from being runtime suspended we must + * be careful not to report a larger value than returned + * previously. + */ + + spin_lock_irqsave(&i915->pmu.lock, flags); + + if (val >= i915->pmu.sample[__I915_SAMPLE_RC6_ESTIMATED].cur) { + i915->pmu.sample[__I915_SAMPLE_RC6_ESTIMATED].cur = 0; + i915->pmu.sample[__I915_SAMPLE_RC6].cur = val; + } else { + val = i915->pmu.sample[__I915_SAMPLE_RC6_ESTIMATED].cur; + } + + spin_unlock_irqrestore(&i915->pmu.lock, flags); + } else { + struct pci_dev *pdev = i915->drm.pdev; + struct device *kdev = &pdev->dev; + + /* + * We are runtime suspended. + * + * Report the delta from when the device was suspended to now, + * on top of the last known real value, as the approximated RC6 + * counter value. + */ + spin_lock_irqsave(&i915->pmu.lock, flags); + spin_lock(&kdev->power.lock); + + /* + * After the above branch intel_runtime_pm_get_if_in_use failed + * to get the runtime PM reference we cannot assume we are in + * runtime suspend since we can either: a) race with coming out + * of it before we took the power.lock, or b) there are other + * states than suspended which can bring us here. + * + * We need to double-check that we are indeed currently runtime + * suspended and if not we cannot do better than report the last + * known RC6 value. + */ + if (kdev->power.runtime_status == RPM_SUSPENDED) { + if (!i915->pmu.sample[__I915_SAMPLE_RC6_ESTIMATED].cur) + i915->pmu.suspended_jiffies_last = + kdev->power.suspended_jiffies; + + val = kdev->power.suspended_jiffies - + i915->pmu.suspended_jiffies_last; + val += jiffies - kdev->power.accounting_timestamp; + + val = jiffies_to_nsecs(val); + val += i915->pmu.sample[__I915_SAMPLE_RC6].cur; + + i915->pmu.sample[__I915_SAMPLE_RC6_ESTIMATED].cur = val; + } else if (i915->pmu.sample[__I915_SAMPLE_RC6_ESTIMATED].cur) { + val = i915->pmu.sample[__I915_SAMPLE_RC6_ESTIMATED].cur; + } else { + val = i915->pmu.sample[__I915_SAMPLE_RC6].cur; + } + + spin_unlock(&kdev->power.lock); + spin_unlock_irqrestore(&i915->pmu.lock, flags); + } + + return val; +#else + return __get_rc6(i915); +#endif +} + +static u64 __i915_pmu_event_read(struct perf_event *event) +{ + struct drm_i915_private *i915 = + container_of(event->pmu, typeof(*i915), pmu.base); + u64 val = 0; + + if (is_engine_event(event)) { + u8 sample = engine_event_sample(event); + struct intel_engine_cs *engine; + + engine = intel_engine_lookup_user(i915, + engine_event_class(event), + engine_event_instance(event)); + + if (WARN_ON_ONCE(!engine)) { + /* Do nothing */ + } else if (sample == I915_SAMPLE_BUSY && + intel_engine_supports_stats(engine)) { + val = ktime_to_ns(intel_engine_get_busy_time(engine)); + } else { + val = engine->pmu.sample[sample].cur; + } + } else { + switch (event->attr.config) { + case I915_PMU_ACTUAL_FREQUENCY: + val = + div_u64(i915->pmu.sample[__I915_SAMPLE_FREQ_ACT].cur, + USEC_PER_SEC /* to MHz */); + break; + case I915_PMU_REQUESTED_FREQUENCY: + val = + div_u64(i915->pmu.sample[__I915_SAMPLE_FREQ_REQ].cur, + USEC_PER_SEC /* to MHz */); + break; + case I915_PMU_INTERRUPTS: + val = count_interrupts(i915); + break; + case I915_PMU_RC6_RESIDENCY: + val = get_rc6(i915); + break; + } + } + + return val; +} + +static void i915_pmu_event_read(struct perf_event *event) +{ + struct hw_perf_event *hwc = &event->hw; + u64 prev, new; + +again: + prev = local64_read(&hwc->prev_count); + new = __i915_pmu_event_read(event); + + if (local64_cmpxchg(&hwc->prev_count, prev, new) != prev) + goto again; + + local64_add(new - prev, &event->count); +} + +static void i915_pmu_enable(struct perf_event *event) +{ + struct drm_i915_private *i915 = + container_of(event->pmu, typeof(*i915), pmu.base); + unsigned int bit = event_enabled_bit(event); + unsigned long flags; + + spin_lock_irqsave(&i915->pmu.lock, flags); + + /* + * Update the bitmask of enabled events and increment + * the event reference counter. + */ + GEM_BUG_ON(bit >= I915_PMU_MASK_BITS); + GEM_BUG_ON(i915->pmu.enable_count[bit] == ~0); + i915->pmu.enable |= BIT_ULL(bit); + i915->pmu.enable_count[bit]++; + + /* + * Start the sampling timer if needed and not already enabled. + */ + __i915_pmu_maybe_start_timer(i915); + + /* + * For per-engine events the bitmask and reference counting + * is stored per engine. + */ + if (is_engine_event(event)) { + u8 sample = engine_event_sample(event); + struct intel_engine_cs *engine; + + engine = intel_engine_lookup_user(i915, + engine_event_class(event), + engine_event_instance(event)); + GEM_BUG_ON(!engine); + engine->pmu.enable |= BIT(sample); + + GEM_BUG_ON(sample >= I915_PMU_SAMPLE_BITS); + GEM_BUG_ON(engine->pmu.enable_count[sample] == ~0); + engine->pmu.enable_count[sample]++; + } + + spin_unlock_irqrestore(&i915->pmu.lock, flags); + + /* + * Store the current counter value so we can report the correct delta + * for all listeners. Even when the event was already enabled and has + * an existing non-zero value. + */ + local64_set(&event->hw.prev_count, __i915_pmu_event_read(event)); +} + +static void i915_pmu_disable(struct perf_event *event) +{ + struct drm_i915_private *i915 = + container_of(event->pmu, typeof(*i915), pmu.base); + unsigned int bit = event_enabled_bit(event); + unsigned long flags; + + spin_lock_irqsave(&i915->pmu.lock, flags); + + if (is_engine_event(event)) { + u8 sample = engine_event_sample(event); + struct intel_engine_cs *engine; + + engine = intel_engine_lookup_user(i915, + engine_event_class(event), + engine_event_instance(event)); + GEM_BUG_ON(!engine); + GEM_BUG_ON(sample >= I915_PMU_SAMPLE_BITS); + GEM_BUG_ON(engine->pmu.enable_count[sample] == 0); + /* + * Decrement the reference count and clear the enabled + * bitmask when the last listener on an event goes away. + */ + if (--engine->pmu.enable_count[sample] == 0) + engine->pmu.enable &= ~BIT(sample); + } + + GEM_BUG_ON(bit >= I915_PMU_MASK_BITS); + GEM_BUG_ON(i915->pmu.enable_count[bit] == 0); + /* + * Decrement the reference count and clear the enabled + * bitmask when the last listener on an event goes away. + */ + if (--i915->pmu.enable_count[bit] == 0) { + i915->pmu.enable &= ~BIT_ULL(bit); + i915->pmu.timer_enabled &= pmu_needs_timer(i915, true); + } + + spin_unlock_irqrestore(&i915->pmu.lock, flags); +} + +static void i915_pmu_event_start(struct perf_event *event, int flags) +{ + i915_pmu_enable(event); + event->hw.state = 0; +} + +static void i915_pmu_event_stop(struct perf_event *event, int flags) +{ + if (flags & PERF_EF_UPDATE) + i915_pmu_event_read(event); + i915_pmu_disable(event); + event->hw.state = PERF_HES_STOPPED; +} + +static int i915_pmu_event_add(struct perf_event *event, int flags) +{ + if (flags & PERF_EF_START) + i915_pmu_event_start(event, flags); + + return 0; +} + +static void i915_pmu_event_del(struct perf_event *event, int flags) +{ + i915_pmu_event_stop(event, PERF_EF_UPDATE); +} + +static int i915_pmu_event_event_idx(struct perf_event *event) +{ + return 0; +} + +struct i915_str_attribute { + struct device_attribute attr; + const char *str; +}; + +static ssize_t i915_pmu_format_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct i915_str_attribute *eattr; + + eattr = container_of(attr, struct i915_str_attribute, attr); + return sprintf(buf, "%s\n", eattr->str); +} + +#define I915_PMU_FORMAT_ATTR(_name, _config) \ + (&((struct i915_str_attribute[]) { \ + { .attr = __ATTR(_name, 0444, i915_pmu_format_show, NULL), \ + .str = _config, } \ + })[0].attr.attr) + +static struct attribute *i915_pmu_format_attrs[] = { + I915_PMU_FORMAT_ATTR(i915_eventid, "config:0-20"), + NULL, +}; + +static const struct attribute_group i915_pmu_format_attr_group = { + .name = "format", + .attrs = i915_pmu_format_attrs, +}; + +struct i915_ext_attribute { + struct device_attribute attr; + unsigned long val; +}; + +static ssize_t i915_pmu_event_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct i915_ext_attribute *eattr; + + eattr = container_of(attr, struct i915_ext_attribute, attr); + return sprintf(buf, "config=0x%lx\n", eattr->val); +} + +static struct attribute_group i915_pmu_events_attr_group = { + .name = "events", + /* Patch in attrs at runtime. */ +}; + +static ssize_t +i915_pmu_get_attr_cpumask(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + return cpumap_print_to_pagebuf(true, buf, &i915_pmu_cpumask); +} + +static DEVICE_ATTR(cpumask, 0444, i915_pmu_get_attr_cpumask, NULL); + +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, +}; + +static const struct attribute_group *i915_pmu_attr_groups[] = { + &i915_pmu_format_attr_group, + &i915_pmu_events_attr_group, + &i915_pmu_cpumask_attr_group, + NULL +}; + +#define __event(__config, __name, __unit) \ +{ \ + .config = (__config), \ + .name = (__name), \ + .unit = (__unit), \ +} + +#define __engine_event(__sample, __name) \ +{ \ + .sample = (__sample), \ + .name = (__name), \ +} + +static struct i915_ext_attribute * +add_i915_attr(struct i915_ext_attribute *attr, const char *name, u64 config) +{ + sysfs_attr_init(&attr->attr.attr); + attr->attr.attr.name = name; + attr->attr.attr.mode = 0444; + attr->attr.show = i915_pmu_event_show; + attr->val = config; + + return ++attr; +} + +static struct perf_pmu_events_attr * +add_pmu_attr(struct perf_pmu_events_attr *attr, const char *name, + const char *str) +{ + sysfs_attr_init(&attr->attr.attr); + attr->attr.attr.name = name; + attr->attr.attr.mode = 0444; + attr->attr.show = perf_event_sysfs_show; + attr->event_str = str; + + return ++attr; +} + +static struct attribute ** +create_event_attributes(struct drm_i915_private *i915) +{ + static const struct { + u64 config; + const char *name; + const char *unit; + } events[] = { + __event(I915_PMU_ACTUAL_FREQUENCY, "actual-frequency", "M"), + __event(I915_PMU_REQUESTED_FREQUENCY, "requested-frequency", "M"), + __event(I915_PMU_INTERRUPTS, "interrupts", NULL), + __event(I915_PMU_RC6_RESIDENCY, "rc6-residency", "ns"), + }; + static const struct { + enum drm_i915_pmu_engine_sample sample; + char *name; + } engine_events[] = { + __engine_event(I915_SAMPLE_BUSY, "busy"), + __engine_event(I915_SAMPLE_SEMA, "sema"), + __engine_event(I915_SAMPLE_WAIT, "wait"), + }; + unsigned int count = 0; + struct perf_pmu_events_attr *pmu_attr = NULL, *pmu_iter; + struct i915_ext_attribute *i915_attr = NULL, *i915_iter; + struct attribute **attr = NULL, **attr_iter; + struct intel_engine_cs *engine; + enum intel_engine_id id; + unsigned int i; + + /* Count how many counters we will be exposing. */ + for (i = 0; i < ARRAY_SIZE(events); i++) { + if (!config_status(i915, events[i].config)) + count++; + } + + for_each_engine(engine, i915, id) { + for (i = 0; i < ARRAY_SIZE(engine_events); i++) { + if (!engine_event_status(engine, + engine_events[i].sample)) + count++; + } + } + + /* Allocate attribute objects and table. */ + i915_attr = kcalloc(count, sizeof(*i915_attr), GFP_KERNEL); + if (!i915_attr) + goto err_alloc; + + pmu_attr = kcalloc(count, sizeof(*pmu_attr), GFP_KERNEL); + if (!pmu_attr) + goto err_alloc; + + /* Max one pointer of each attribute type plus a termination entry. */ + attr = kcalloc(count * 2 + 1, sizeof(*attr), GFP_KERNEL); + if (!attr) + goto err_alloc; + + i915_iter = i915_attr; + pmu_iter = pmu_attr; + attr_iter = attr; + + /* Initialize supported non-engine counters. */ + for (i = 0; i < ARRAY_SIZE(events); i++) { + char *str; + + if (config_status(i915, events[i].config)) + continue; + + str = kstrdup(events[i].name, GFP_KERNEL); + if (!str) + goto err; + + *attr_iter++ = &i915_iter->attr.attr; + i915_iter = add_i915_attr(i915_iter, str, events[i].config); + + if (events[i].unit) { + str = kasprintf(GFP_KERNEL, "%s.unit", events[i].name); + if (!str) + goto err; + + *attr_iter++ = &pmu_iter->attr.attr; + pmu_iter = add_pmu_attr(pmu_iter, str, events[i].unit); + } + } + + /* Initialize supported engine counters. */ + for_each_engine(engine, i915, id) { + for (i = 0; i < ARRAY_SIZE(engine_events); i++) { + char *str; + + if (engine_event_status(engine, + engine_events[i].sample)) + continue; + + str = kasprintf(GFP_KERNEL, "%s-%s", + engine->name, engine_events[i].name); + if (!str) + goto err; + + *attr_iter++ = &i915_iter->attr.attr; + i915_iter = + add_i915_attr(i915_iter, str, + __I915_PMU_ENGINE(engine->uabi_class, + engine->instance, + engine_events[i].sample)); + + str = kasprintf(GFP_KERNEL, "%s-%s.unit", + engine->name, engine_events[i].name); + if (!str) + goto err; + + *attr_iter++ = &pmu_iter->attr.attr; + pmu_iter = add_pmu_attr(pmu_iter, str, "ns"); + } + } + + i915->pmu.i915_attr = i915_attr; + i915->pmu.pmu_attr = pmu_attr; + + return attr; + +err:; + for (attr_iter = attr; *attr_iter; attr_iter++) + kfree((*attr_iter)->name); + +err_alloc: + kfree(attr); + kfree(i915_attr); + kfree(pmu_attr); + + return NULL; +} + +static void free_event_attributes(struct drm_i915_private *i915) +{ + struct attribute **attr_iter = i915_pmu_events_attr_group.attrs; + + for (; *attr_iter; attr_iter++) + kfree((*attr_iter)->name); + + kfree(i915_pmu_events_attr_group.attrs); + kfree(i915->pmu.i915_attr); + kfree(i915->pmu.pmu_attr); + + i915_pmu_events_attr_group.attrs = NULL; + i915->pmu.i915_attr = NULL; + i915->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), node); + + GEM_BUG_ON(!pmu->base.event_init); + + /* Select the first online CPU as a designated reader. */ + if (!cpumask_weight(&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), node); + unsigned int target; + + GEM_BUG_ON(!pmu->base.event_init); + + 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); + perf_pmu_migrate_context(&pmu->base, cpu, target); + } + } + + return 0; +} + +static enum cpuhp_state cpuhp_slot = CPUHP_INVALID; + +static int i915_pmu_register_cpuhp_state(struct drm_i915_private *i915) +{ + enum cpuhp_state slot; + 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) + return ret; + + slot = ret; + ret = cpuhp_state_add_instance(slot, &i915->pmu.node); + if (ret) { + cpuhp_remove_multi_state(slot); + return ret; + } + + cpuhp_slot = slot; + return 0; +} + +static void i915_pmu_unregister_cpuhp_state(struct drm_i915_private *i915) +{ + WARN_ON(cpuhp_slot == CPUHP_INVALID); + WARN_ON(cpuhp_state_remove_instance(cpuhp_slot, &i915->pmu.node)); + cpuhp_remove_multi_state(cpuhp_slot); +} + +void i915_pmu_register(struct drm_i915_private *i915) +{ + int ret; + + if (INTEL_GEN(i915) <= 2) { + DRM_INFO("PMU not supported for this GPU."); + return; + } + + i915_pmu_events_attr_group.attrs = create_event_attributes(i915); + if (!i915_pmu_events_attr_group.attrs) { + ret = -ENOMEM; + goto err; + } + + i915->pmu.base.attr_groups = i915_pmu_attr_groups; + i915->pmu.base.task_ctx_nr = perf_invalid_context; + i915->pmu.base.event_init = i915_pmu_event_init; + i915->pmu.base.add = i915_pmu_event_add; + i915->pmu.base.del = i915_pmu_event_del; + i915->pmu.base.start = i915_pmu_event_start; + i915->pmu.base.stop = i915_pmu_event_stop; + i915->pmu.base.read = i915_pmu_event_read; + i915->pmu.base.event_idx = i915_pmu_event_event_idx; + + spin_lock_init(&i915->pmu.lock); + hrtimer_init(&i915->pmu.timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); + i915->pmu.timer.function = i915_sample; + + ret = perf_pmu_register(&i915->pmu.base, "i915", -1); + if (ret) + goto err; + + ret = i915_pmu_register_cpuhp_state(i915); + if (ret) + goto err_unreg; + + return; + +err_unreg: + perf_pmu_unregister(&i915->pmu.base); +err: + i915->pmu.base.event_init = NULL; + free_event_attributes(i915); + DRM_NOTE("Failed to register PMU! (err=%d)\n", ret); +} + +void i915_pmu_unregister(struct drm_i915_private *i915) +{ + if (!i915->pmu.base.event_init) + return; + + WARN_ON(i915->pmu.enable); + + hrtimer_cancel(&i915->pmu.timer); + + i915_pmu_unregister_cpuhp_state(i915); + + perf_pmu_unregister(&i915->pmu.base); + i915->pmu.base.event_init = NULL; + free_event_attributes(i915); +} |