See comments inline below.
Zhanjun
On 2023-09-22 6:25 p.m., John.C.Harrison@xxxxxxxxx wrote:
From: Umesh Nerlige Ramappa <umesh.nerlige.ramappa@xxxxxxxxx>
In new version of GuC engine busyness, GuC provides engine busyness
ticks as a 64 bit counter. Add a new counter to relay this value to the
user as is.
Signed-off-by: Umesh Nerlige Ramappa <umesh.nerlige.ramappa@xxxxxxxxx>
Signed-off-by: John Harrison <John.C.Harrison@xxxxxxxxx>
---
drivers/gpu/drm/i915/gt/intel_engine.h | 1 +
drivers/gpu/drm/i915/gt/intel_engine_cs.c | 16 +++++
drivers/gpu/drm/i915/gt/intel_engine_types.h | 12 ++++
drivers/gpu/drm/i915/gt/intel_engine_user.c | 1 +
.../gpu/drm/i915/gt/uc/intel_guc_submission.c | 67 ++++++++++++++-----
drivers/gpu/drm/i915/i915_pmu.c | 25 ++++++-
drivers/gpu/drm/i915/i915_pmu.h | 2 +-
include/uapi/drm/i915_drm.h | 13 +++-
8 files changed, 116 insertions(+), 21 deletions(-)
diff --git a/drivers/gpu/drm/i915/gt/intel_engine.h b/drivers/gpu/drm/i915/gt/intel_engine.h
index b58c30ac8ef02..57af7ec8ecd82 100644
--- a/drivers/gpu/drm/i915/gt/intel_engine.h
+++ b/drivers/gpu/drm/i915/gt/intel_engine.h
@@ -249,6 +249,7 @@ void intel_engine_dump_active_requests(struct list_head *requests,
ktime_t intel_engine_get_busy_time(struct intel_engine_cs *engine,
ktime_t *now);
+u64 intel_engine_get_busy_ticks(struct intel_engine_cs *engine);
void intel_engine_get_hung_entity(struct intel_engine_cs *engine,
struct intel_context **ce, struct i915_request **rq);
diff --git a/drivers/gpu/drm/i915/gt/intel_engine_cs.c b/drivers/gpu/drm/i915/gt/intel_engine_cs.c
index 84a75c95f3f7d..1c9ffb1ae9889 100644
--- a/drivers/gpu/drm/i915/gt/intel_engine_cs.c
+++ b/drivers/gpu/drm/i915/gt/intel_engine_cs.c
@@ -2426,6 +2426,22 @@ ktime_t intel_engine_get_busy_time(struct intel_engine_cs *engine, ktime_t *now)
return engine->busyness(engine, now);
}
+/**
+ * intel_engine_get_busy_ticks() - Return current accumulated engine busyness
+ * ticks
+ * @engine: engine to report on
+ *
+ * Returns accumulated ticks @engine was busy since engine stats were enabled.
+ */
+u64 intel_engine_get_busy_ticks(struct intel_engine_cs *engine)
+{
+ if (!engine->busyness_ticks ||
+ !(engine->flags & I915_ENGINE_SUPPORTS_TICKS_STATS))
+ return 0;
+
+ return engine->busyness_ticks(engine);
+}
+
struct intel_context *
intel_engine_create_virtual(struct intel_engine_cs **siblings,
unsigned int count, unsigned long flags)
diff --git a/drivers/gpu/drm/i915/gt/intel_engine_types.h b/drivers/gpu/drm/i915/gt/intel_engine_types.h
index 40fd8f984d64b..a88d40c74d604 100644
--- a/drivers/gpu/drm/i915/gt/intel_engine_types.h
+++ b/drivers/gpu/drm/i915/gt/intel_engine_types.h
@@ -548,6 +548,11 @@ struct intel_engine_cs {
ktime_t (*busyness)(struct intel_engine_cs *engine,
ktime_t *now);
+ /*
+ * Get engine busyness ticks
+ */
+ u64 (*busyness_ticks)(struct intel_engine_cs *engine);
+
struct intel_engine_execlists execlists;
/*
@@ -574,6 +579,7 @@ struct intel_engine_cs {
#define I915_ENGINE_HAS_EU_PRIORITY BIT(10)
#define I915_ENGINE_FIRST_RENDER_COMPUTE BIT(11)
#define I915_ENGINE_USES_WA_HOLD_CCS_SWITCHOUT BIT(12)
+#define I915_ENGINE_SUPPORTS_TICKS_STATS BIT(13)
unsigned int flags;
/*
@@ -649,6 +655,12 @@ intel_engine_supports_stats(const struct intel_engine_cs *engine)
return engine->flags & I915_ENGINE_SUPPORTS_STATS;
}
+static inline bool
+intel_engine_supports_tick_stats(const struct intel_engine_cs *engine)
+{
+ return engine->flags & I915_ENGINE_SUPPORTS_TICKS_STATS;
+}
+
static inline bool
intel_engine_has_preemption(const struct intel_engine_cs *engine)
{
diff --git a/drivers/gpu/drm/i915/gt/intel_engine_user.c b/drivers/gpu/drm/i915/gt/intel_engine_user.c
index dcedff41a825f..69eb610b5ab0a 100644
--- a/drivers/gpu/drm/i915/gt/intel_engine_user.c
+++ b/drivers/gpu/drm/i915/gt/intel_engine_user.c
@@ -100,6 +100,7 @@ static void set_scheduler_caps(struct drm_i915_private *i915)
MAP(HAS_PREEMPTION, PREEMPTION),
MAP(HAS_SEMAPHORES, SEMAPHORES),
MAP(SUPPORTS_STATS, ENGINE_BUSY_STATS),
+ MAP(SUPPORTS_TICKS_STATS, ENGINE_BUSY_TICKS_STATS),
#undef MAP
};
struct intel_engine_cs *engine;
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 0c1fee5360777..71749fb9ad35b 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
+++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
@@ -1289,12 +1289,7 @@ static void busy_v1_guc_update_pm_timestamp(struct intel_guc *guc, ktime_t *now)
guc->busy.v1.gt_stamp = ((u64)gt_stamp_hi << 32) | gt_stamp_lo;
}
-/*
- * Unlike the execlist mode of submission total and active times are in terms of
- * gt clocks. The *now parameter is retained to return the cpu time at which the
- * busyness was sampled.
- */
-static ktime_t busy_v1_guc_engine_busyness(struct intel_engine_cs *engine, ktime_t *now)
+static u64 __busy_v1_guc_engine_busyness_ticks(struct intel_engine_cs *engine, ktime_t *now_out)
{
struct intel_engine_guc_stats_v1 stats_saved, *stats = &engine->stats.guc_v1;
struct i915_gpu_error *gpu_error = &engine->i915->gpu_error;
@@ -1304,6 +1299,7 @@ static ktime_t busy_v1_guc_engine_busyness(struct intel_engine_cs *engine, ktime
unsigned long flags;
u32 reset_count;
bool in_reset;
+ ktime_t now;
spin_lock_irqsave(&guc->busy.v1.lock, flags);
@@ -1318,7 +1314,7 @@ static ktime_t busy_v1_guc_engine_busyness(struct intel_engine_cs *engine, ktime
reset_count = i915_reset_count(gpu_error);
in_reset = test_bit(I915_RESET_BACKOFF, >->reset.flags);
- *now = ktime_get();
+ now = ktime_get();
/*
* The active busyness depends on start_gt_clk and gt_stamp.
@@ -1334,7 +1330,7 @@ static ktime_t busy_v1_guc_engine_busyness(struct intel_engine_cs *engine, ktime
* start_gt_clk' calculation below for active engines.
*/
busy_v1_guc_update_engine_gt_clks(engine);
- busy_v1_guc_update_pm_timestamp(guc, now);
+ busy_v1_guc_update_pm_timestamp(guc, &now);
intel_gt_pm_put_async(gt);
if (i915_reset_count(gpu_error) != reset_count) {
*stats = stats_saved;
@@ -1342,16 +1338,37 @@ static ktime_t busy_v1_guc_engine_busyness(struct intel_engine_cs *engine, ktime
}
}
- total = intel_gt_clock_interval_to_ns(gt, stats->total_gt_clks);
+ total = stats->total_gt_clks;
if (stats->running) {
u64 clk = guc->busy.v1.gt_stamp - stats->start_gt_clk;
- total += intel_gt_clock_interval_to_ns(gt, clk);
+ total += clk;
}
spin_unlock_irqrestore(&guc->busy.v1.lock, flags);
- return ns_to_ktime(total);
+ if (now_out)
+ *now_out = now;
+
+ return total;
+}
+
+/*
+ * Unlike the execlist mode of submission total and active times are in terms of
+ * gt clocks. The *now parameter is retained to return the cpu time at which the
+ * busyness was sampled.
+ */
+static ktime_t busy_v1_guc_engine_busyness(struct intel_engine_cs *engine, ktime_t *now)
+{
+ u64 ticks = __busy_v1_guc_engine_busyness_ticks(engine, now);
+ u64 ns = intel_gt_clock_interval_to_ns(engine->gt, ticks);
+
+ return ns_to_ktime(ns);
+}
+
+static u64 busy_v1_guc_engine_busyness_ticks(struct intel_engine_cs *engine)
+{
+ return __busy_v1_guc_engine_busyness_ticks(engine, NULL);
}
static void busy_v1_guc_enable_worker(struct intel_guc *guc)
@@ -1607,6 +1624,16 @@ static ktime_t busy_v2_guc_engine_busyness(struct intel_engine_cs *engine, ktime
return ns_to_ktime(total);
}
+static u64 busy_v2_guc_engine_busyness_ticks(struct intel_engine_cs *engine)
+{
+ struct intel_guc *guc = &engine->gt->uc.guc;
+ u64 ticks_engine;
+
+ __busy_v2_get_engine_usage_record(guc, engine, &ticks_engine, NULL, NULL);
+
+ return ticks_engine;
+}
+
static u64 busy_v1_intel_guc_total_active_ticks(struct intel_guc *guc)
{
return guc->busy.v1.gt_stamp;
@@ -4480,12 +4507,20 @@ static void guc_default_vfuncs(struct intel_engine_cs *engine)
engine->emit_flush = gen12_emit_flush_xcs;
}
engine->set_default_submission = guc_set_default_submission;
- if (GUC_SUBMIT_VER(&engine->gt->uc.guc) < MAKE_GUC_VER(1, 3, 1))
- engine->busyness = busy_v1_guc_engine_busyness;
- else
- engine->busyness = busy_v2_guc_engine_busyness;
+ if (GUC_SUBMIT_VER(&engine->gt->uc.guc) < MAKE_GUC_VER(1, 3, 1)) {
+ if (GRAPHICS_VER_FULL(engine->i915) < IP_VER(12, 70))
+ engine->busyness = busy_v1_guc_engine_busyness;
+ engine->busyness_ticks = busy_v1_guc_engine_busyness_ticks;
+ } else {
+ if (GRAPHICS_VER_FULL(engine->i915) < IP_VER(12, 70))
+ engine->busyness = busy_v2_guc_engine_busyness;
Do we leave engine->busyness not initialized when >= IP_VER(12, 70)?
+ engine->busyness_ticks = busy_v2_guc_engine_busyness_ticks;
+ }
+
+ if (engine->busyness)
+ engine->flags |= I915_ENGINE_SUPPORTS_STATS;
- engine->flags |= I915_ENGINE_SUPPORTS_STATS;
+ engine->flags |= I915_ENGINE_SUPPORTS_TICKS_STATS;
engine->flags |= I915_ENGINE_HAS_PREEMPTION;
engine->flags |= I915_ENGINE_HAS_TIMESLICES;
diff --git a/drivers/gpu/drm/i915/i915_pmu.c b/drivers/gpu/drm/i915/i915_pmu.c
index 4f52636eb4a80..1b859556644f6 100644
--- a/drivers/gpu/drm/i915/i915_pmu.c
+++ b/drivers/gpu/drm/i915/i915_pmu.c
@@ -26,7 +26,8 @@
#define ENGINE_SAMPLE_MASK \
(BIT(I915_SAMPLE_BUSY) | \
BIT(I915_SAMPLE_WAIT) | \
- BIT(I915_SAMPLE_SEMA))
+ BIT(I915_SAMPLE_SEMA) | \
+ BIT(I915_SAMPLE_BUSY_TICKS))
static cpumask_t i915_pmu_cpumask;
static unsigned int i915_pmu_target_cpu = -1;
@@ -161,8 +162,11 @@ static bool pmu_needs_timer(struct i915_pmu *pmu)
* Also there is software busyness tracking available we do not
* need the timer for I915_SAMPLE_BUSY counter.
*/
- if (i915->caps.scheduler & I915_SCHEDULER_CAP_ENGINE_BUSY_STATS)
+ if ((i915->caps.scheduler & I915_SCHEDULER_CAP_ENGINE_BUSY_STATS) ||
+ (i915->caps.scheduler & I915_SCHEDULER_CAP_ENGINE_BUSY_TICKS_STATS)) {
enable &= ~BIT(I915_SAMPLE_BUSY);
+ enable &= ~BIT(I915_SAMPLE_BUSY_TICKS);
+ }
/*
* If some bits remain it means we need the sampling timer running.
@@ -362,7 +366,8 @@ static void engine_sample(struct intel_engine_cs *engine, unsigned int period_ns
add_sample(&pmu->sample[I915_SAMPLE_SEMA], period_ns);
/* No need to sample when busy stats are supported. */
- if (intel_engine_supports_stats(engine))
+ if (intel_engine_supports_stats(engine) ||
+ intel_engine_supports_tick_stats(engine))
return;
/*
@@ -519,6 +524,13 @@ engine_event_status(struct intel_engine_cs *engine,
{
switch (sample) {
case I915_SAMPLE_BUSY:
+ if (!intel_engine_supports_stats(engine))
+ return -ENODEV;
+ break;
+ case I915_SAMPLE_BUSY_TICKS:
+ if (!intel_engine_supports_tick_stats(engine))
+ return -ENODEV;
+ break;
case I915_SAMPLE_WAIT:
break;
case I915_SAMPLE_SEMA:
@@ -651,6 +663,9 @@ static u64 __i915_pmu_event_read(struct perf_event *event)
val = ktime_to_ns(intel_engine_get_busy_time(engine,
&unused));
+ } else if (sample == I915_SAMPLE_BUSY_TICKS &&
+ intel_engine_supports_tick_stats(engine)) {
+ val = intel_engine_get_busy_ticks(engine);
} else {
val = engine->pmu.sample[sample].cur;
}
@@ -1000,6 +1015,7 @@ create_event_attributes(struct i915_pmu *pmu)
__engine_event(I915_SAMPLE_BUSY, "busy"),
__engine_event(I915_SAMPLE_SEMA, "sema"),
__engine_event(I915_SAMPLE_WAIT, "wait"),
+ __engine_event(I915_SAMPLE_BUSY_TICKS, "busy-ticks"),
};
unsigned int count = 0;
struct perf_pmu_events_attr *pmu_attr = NULL, *pmu_iter;
@@ -1103,6 +1119,9 @@ create_event_attributes(struct i915_pmu *pmu)
engine->uabi_instance,
engine_events[i].sample));
+ if (engine_events[i].sample == I915_SAMPLE_BUSY_TICKS)
+ continue;
+
str = kasprintf(GFP_KERNEL, "%s-%s.unit",
engine->name, engine_events[i].name);
if (!str)
diff --git a/drivers/gpu/drm/i915/i915_pmu.h b/drivers/gpu/drm/i915/i915_pmu.h
index 41af038c37388..72a9c71944f8d 100644
--- a/drivers/gpu/drm/i915/i915_pmu.h
+++ b/drivers/gpu/drm/i915/i915_pmu.h
@@ -49,7 +49,7 @@ enum {
(I915_ENGINE_SAMPLE_COUNT + \
I915_PMU_MAX_GT * __I915_PMU_TRACKED_EVENT_COUNT)
-#define I915_ENGINE_SAMPLE_COUNT (I915_SAMPLE_SEMA + 1)
+#define I915_ENGINE_SAMPLE_COUNT (I915_SAMPLE_BUSY_TICKS + 1)
struct i915_pmu_sample {
u64 cur;
diff --git a/include/uapi/drm/i915_drm.h b/include/uapi/drm/i915_drm.h
index e26dd27ff4a5f..8ae98c1bda0ea 100644
--- a/include/uapi/drm/i915_drm.h
+++ b/include/uapi/drm/i915_drm.h
@@ -257,7 +257,8 @@ struct i915_engine_class_instance {
enum drm_i915_pmu_engine_sample {
I915_SAMPLE_BUSY = 0,
I915_SAMPLE_WAIT = 1,
- I915_SAMPLE_SEMA = 2
+ I915_SAMPLE_SEMA = 2,
+ I915_SAMPLE_BUSY_TICKS = 3,
};
#define I915_PMU_SAMPLE_BITS (4)
@@ -274,6 +275,9 @@ enum drm_i915_pmu_engine_sample {
#define I915_PMU_ENGINE_BUSY(class, instance) \
__I915_PMU_ENGINE(class, instance, I915_SAMPLE_BUSY)
+#define I915_PMU_ENGINE_BUSY_TICKS(class, instance) \
+ __I915_PMU_ENGINE(class, instance, I915_SAMPLE_BUSY_TICKS)
+
#define I915_PMU_ENGINE_WAIT(class, instance) \
__I915_PMU_ENGINE(class, instance, I915_SAMPLE_WAIT)
@@ -651,7 +655,14 @@ typedef struct drm_i915_irq_wait {
#define I915_SCHEDULER_CAP_PRIORITY (1ul << 1)
#define I915_SCHEDULER_CAP_PREEMPTION (1ul << 2)
#define I915_SCHEDULER_CAP_SEMAPHORES (1ul << 3)
+/*
+ * BUSY_STATS is deprecated on platforms with GuC based submission and will nt
+ * be available at all on newer platforms. It has accuracy issues due to the
+ * conversions from tick counts to wall time.
+ * BUSY_TICKS_STATS should be used instead.
+ */
#define I915_SCHEDULER_CAP_ENGINE_BUSY_STATS (1ul << 4)
+#define I915_SCHEDULER_CAP_ENGINE_BUSY_TICKS_STATS (1ul << 5)
/*
* Indicates the 2k user priority levels are statically mapped into 3 buckets as
* follows:
