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drm/i915/gt: Track the overall awake/busy time

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Since we wake the GT up before executing a request, and go to sleep as
soon as it is retired, the GT wake time not only represents how long the
device is powered up, but also provides a summary, albeit an overestimate,
of the device runtime (i.e. the rc0 time to compare against rc6 time).

v2: s/busy/awake/
v3: software-gt-awake-time and I915_PMU_SOFTWARE_GT_AWAKE_TIME

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: Matthew Brost <matthew.brost@intel.com>
Reported-by: kernel test robot <oliver.sang@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20201215154456.13954-1-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson 2020-12-15 15:44:56 +00:00
parent e3ed90b822
commit 8c3b1ba0e7
7 changed files with 89 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
drivers/gpu/drm/i915/gt/debugfs_gt_pm.c
View File

@ -11,6 +11,7 @@
#include "i915_drv.h"
#include "intel_gt.h"
#include "intel_gt_clock_utils.h"
#include "intel_gt_pm.h"
#include "intel_llc.h"
#include "intel_rc6.h"
#include "intel_rps.h"
@ -558,7 +559,9 @@ static int rps_boost_show(struct seq_file *m, void *data)
seq_printf(m, "RPS enabled? %s\n", yesno(intel_rps_is_enabled(rps)));
seq_printf(m, "RPS active? %s\n", yesno(intel_rps_is_active(rps)));
seq_printf(m, "GPU busy? %s\n", yesno(gt->awake));
seq_printf(m, "GPU busy? %s, %llums\n",
yesno(gt->awake),
ktime_to_ms(intel_gt_get_awake_time(gt)));
seq_printf(m, "Boosts outstanding? %d\n",
atomic_read(&rps->num_waiters));
seq_printf(m, "Interactive? %d\n", READ_ONCE(rps->power.interactive));

49
drivers/gpu/drm/i915/gt/intel_gt_pm.c
View File

@ -39,6 +39,28 @@ static void user_forcewake(struct intel_gt *gt, bool suspend)
intel_gt_pm_put(gt);
}
static void runtime_begin(struct intel_gt *gt)
{
local_irq_disable();
write_seqcount_begin(&gt->stats.lock);
gt->stats.start = ktime_get();
gt->stats.active = true;
write_seqcount_end(&gt->stats.lock);
local_irq_enable();
}
static void runtime_end(struct intel_gt *gt)
{
local_irq_disable();
write_seqcount_begin(&gt->stats.lock);
gt->stats.active = false;
gt->stats.total =
ktime_add(gt->stats.total,
ktime_sub(ktime_get(), gt->stats.start));
write_seqcount_end(&gt->stats.lock);
local_irq_enable();
}
static int __gt_unpark(struct intel_wakeref *wf)
{
struct intel_gt *gt = container_of(wf, typeof(*gt), wakeref);
@ -67,6 +89,7 @@ static int __gt_unpark(struct intel_wakeref *wf)
i915_pmu_gt_unparked(i915);
intel_gt_unpark_requests(gt);
runtime_begin(gt);
return 0;
}
@ -79,6 +102,7 @@ static int __gt_park(struct intel_wakeref *wf)
GT_TRACE(gt, "\n");
runtime_end(gt);
intel_gt_park_requests(gt);
i915_vma_parked(gt);
@ -106,6 +130,7 @@ static const struct intel_wakeref_ops wf_ops = {
void intel_gt_pm_init_early(struct intel_gt *gt)
{
intel_wakeref_init(&gt->wakeref, gt->uncore->rpm, &wf_ops);
seqcount_mutex_init(&gt->stats.lock, &gt->wakeref.mutex);
}
void intel_gt_pm_init(struct intel_gt *gt)
@ -339,6 +364,30 @@ int intel_gt_runtime_resume(struct intel_gt *gt)
return intel_uc_runtime_resume(&gt->uc);
}
static ktime_t __intel_gt_get_awake_time(const struct intel_gt *gt)
{
ktime_t total = gt->stats.total;
if (gt->stats.active)
total = ktime_add(total,
ktime_sub(ktime_get(), gt->stats.start));
return total;
}
ktime_t intel_gt_get_awake_time(const struct intel_gt *gt)
{
unsigned int seq;
ktime_t total;
do {
seq = read_seqcount_begin(&gt->stats.lock);
total = __intel_gt_get_awake_time(gt);
} while (read_seqcount_retry(&gt->stats.lock, seq));
return total;
}
#if IS_ENABLED(CONFIG_DRM_I915_SELFTEST)
#include "selftest_gt_pm.c"
#endif

2
drivers/gpu/drm/i915/gt/intel_gt_pm.h
View File

@ -58,6 +58,8 @@ int intel_gt_resume(struct intel_gt *gt);
void intel_gt_runtime_suspend(struct intel_gt *gt);
int intel_gt_runtime_resume(struct intel_gt *gt);
ktime_t intel_gt_get_awake_time(const struct intel_gt *gt);
static inline bool is_mock_gt(const struct intel_gt *gt)
{
return I915_SELFTEST_ONLY(gt->awake == -ENODEV);

24
drivers/gpu/drm/i915/gt/intel_gt_types.h
View File

@ -87,6 +87,30 @@ struct intel_gt {
u32 pm_guc_events;
struct {
bool active;
/**
* @lock: Lock protecting the below fields.
*/
seqcount_mutex_t lock;
/**
* @total: Total time this engine was busy.
*
* Accumulated time not counting the most recent block in cases
* where engine is currently busy (active > 0).
*/
ktime_t total;
/**
* @start: Timestamp of the last idle to active transition.
*
* Idle is defined as active == 0, active is active > 0.
*/
ktime_t start;
} stats;
struct intel_engine_cs *engine[I915_NUM_ENGINES];
struct intel_engine_cs *engine_class[MAX_ENGINE_CLASS + 1]
[MAX_ENGINE_INSTANCE + 1];

5
drivers/gpu/drm/i915/i915_debugfs.c
View File

@ -1314,9 +1314,10 @@ static int i915_engine_info(struct seq_file *m, void *unused)
wakeref = intel_runtime_pm_get(&i915->runtime_pm);
seq_printf(m, "GT awake? %s [%d]\n",
seq_printf(m, "GT awake? %s [%d], %llums\n",
yesno(i915->gt.awake),
atomic_read(&i915->gt.wakeref.count));
atomic_read(&i915->gt.wakeref.count),
ktime_to_ms(intel_gt_get_awake_time(&i915->gt)));
seq_printf(m, "CS timestamp frequency: %u Hz\n",
RUNTIME_INFO(i915)->cs_timestamp_frequency_hz);

6
drivers/gpu/drm/i915/i915_pmu.c
View File

@ -509,6 +509,8 @@ config_status(struct drm_i915_private *i915, u64 config)
if (!HAS_RC6(i915))
return -ENODEV;
break;
case I915_PMU_SOFTWARE_GT_AWAKE_TIME:
break;
default:
return -ENOENT;
}
@ -616,6 +618,9 @@ static u64 __i915_pmu_event_read(struct perf_event *event)
case I915_PMU_RC6_RESIDENCY:
val = get_rc6(&i915->gt);
break;
case I915_PMU_SOFTWARE_GT_AWAKE_TIME:
val = ktime_to_ns(intel_gt_get_awake_time(&i915->gt));
break;
}
}
@ -916,6 +921,7 @@ create_event_attributes(struct i915_pmu *pmu)
__event(I915_PMU_REQUESTED_FREQUENCY, "requested-frequency", "M"),
__event(I915_PMU_INTERRUPTS, "interrupts", NULL),
__event(I915_PMU_RC6_RESIDENCY, "rc6-residency", "ns"),
__event(I915_PMU_SOFTWARE_GT_AWAKE_TIME, "software-gt-awake-time", "ns"),
};
static const struct {
enum drm_i915_pmu_engine_sample sample;

1
include/uapi/drm/i915_drm.h
View File

@ -177,6 +177,7 @@ enum drm_i915_pmu_engine_sample {
#define I915_PMU_REQUESTED_FREQUENCY __I915_PMU_OTHER(1)
#define I915_PMU_INTERRUPTS __I915_PMU_OTHER(2)
#define I915_PMU_RC6_RESIDENCY __I915_PMU_OTHER(3)
#define I915_PMU_SOFTWARE_GT_AWAKE_TIME __I915_PMU_OTHER(4)
#define I915_PMU_LAST /* Deprecated - do not use */ I915_PMU_RC6_RESIDENCY