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/*
* SPDX-License-Identifier: MIT
*
* Copyright © 2017-2018 Intel Corporation
*/
#ifndef __I915_PMU_H__
#define __I915_PMU_H__
#include <linux/hrtimer.h>
#include <linux/perf_event.h>
#include <linux/spinlock_types.h>
#include <uapi/drm/i915_drm.h>
struct drm_i915_private;
/**
* Non-engine events that we need to track enabled-disabled transition and
* current state.
*/
enum i915_pmu_tracked_events {
__I915_PMU_ACTUAL_FREQUENCY_ENABLED = 0,
__I915_PMU_REQUESTED_FREQUENCY_ENABLED,
__I915_PMU_RC6_RESIDENCY_ENABLED,
__I915_PMU_TRACKED_EVENT_COUNT, /* count marker */
};
/**
* Slots used from the sampling timer (non-engine events) with some extras for
* convenience.
*/
enum {
__I915_SAMPLE_FREQ_ACT = 0,
__I915_SAMPLE_FREQ_REQ,
__I915_SAMPLE_RC6,
__I915_SAMPLE_RC6_LAST_REPORTED,
__I915_NUM_PMU_SAMPLERS
};
/**
* How many different events we track in the global PMU mask.
*
* It is also used to know to needed number of event reference counters.
*/
#define I915_PMU_MASK_BITS \
(I915_ENGINE_SAMPLE_COUNT + __I915_PMU_TRACKED_EVENT_COUNT)
#define I915_ENGINE_SAMPLE_COUNT (I915_SAMPLE_SEMA + 1)
struct i915_pmu_sample {
u64 cur;
};
struct i915_pmu {
/**
* @cpuhp: Struct used for CPU hotplug handling.
*/
struct {
struct hlist_node node;
unsigned int cpu;
} cpuhp;
/**
* @base: PMU base.
*/
struct pmu base;
/**
* @closed: i915 is unregistering.
*/
bool closed;
/**
* @name: Name as registered with perf core.
*/
const char *name;
/**
* @lock: Lock protecting enable mask and ref count handling.
*/
spinlock_t lock;
/**
* @timer: Timer for internal i915 PMU sampling.
*/
struct hrtimer timer;
/**
* @enable: Bitmask of specific enabled events.
*
* For some events we need to track their state and do some internal
* house keeping.
*
* Each engine event sampler type and event listed in enum
* i915_pmu_tracked_events gets a bit in this field.
*
* Low bits are engine samplers and other events continue from there.
*/
u32 enable;
/**
* @timer_last:
*
* Timestmap of the previous timer invocation.
*/
ktime_t timer_last;
/**
* @enable_count: Reference counts for the enabled events.
*
* Array indices are mapped in the same way as bits in the @enable field
* and they are used to control sampling on/off when multiple clients
* are using the PMU API.
*/
unsigned int enable_count[I915_PMU_MASK_BITS];
/**
* @timer_enabled: Should the internal sampling timer be running.
*/
bool timer_enabled;
/**
* @sample: Current and previous (raw) counters for sampling events.
*
* These counters are updated from the i915 PMU sampling timer.
*
* Only global counters are held here, while the per-engine ones are in
* struct intel_engine_cs.
*/
struct i915_pmu_sample sample[__I915_NUM_PMU_SAMPLERS];
/**
* @sleep_last: Last time GT parked for RC6 estimation.
*/
ktime_t sleep_last;
/**
* @irq_count: Number of interrupts
*
* Intentionally unsigned long to avoid atomics or heuristics on 32bit.
* 4e9 interrupts are a lot and postprocessing can really deal with an
* occasional wraparound easily. It's 32bit after all.
*/
unsigned long irq_count;
/**
* @events_attr_group: Device events attribute group.
*/
struct attribute_group events_attr_group;
/**
* @i915_attr: Memory block holding device attributes.
*/
void *i915_attr;
/**
* @pmu_attr: Memory block holding device attributes.
*/
void *pmu_attr;
};
#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 drm_i915_private *i915);
void i915_pmu_gt_unparked(struct drm_i915_private *i915);
#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 drm_i915_private *i915) {}
static inline void i915_pmu_gt_unparked(struct drm_i915_private *i915) {}
#endif
#endif
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