[PATCH 7/9] drm/i915: Track leaked gt->wakerefs

Andrzej Hajda
2022-02-17T14:05:46Z

From: Chris Wilson <chris@chris-wilson.co.uk>

Track every intel_gt_pm_get() until its corresponding release in
intel_gt_pm_put() by returning a cookie to the caller for acquire that
must be passed by on rleased. When there is an imbalance, we can see who
either tried to free a stale wakeref, or who forgot to free theirs.

v2: Rebase from backporting wakeref leak (Umesh)

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Andrzej Hajda <andrzej.hajda@intel.com>
Signed-off-by: Andrzej Hajda <andrzej.hajda@intel.com>
---
drivers/gpu/drm/i915/Kconfig.debug | 15 +++++++
.../gpu/drm/i915/gem/i915_gem_execbuffer.c | 7 ++--
.../i915/gem/selftests/i915_gem_coherency.c | 10 +++--
.../drm/i915/gem/selftests/i915_gem_mman.c | 14 ++++---
drivers/gpu/drm/i915/gt/intel_breadcrumbs.c | 13 ++++--
.../gpu/drm/i915/gt/intel_breadcrumbs_types.h | 3 +-
drivers/gpu/drm/i915/gt/intel_engine_pm.c | 4 +-
drivers/gpu/drm/i915/gt/intel_engine_types.h | 2 +
.../drm/i915/gt/intel_execlists_submission.c | 2 +-
drivers/gpu/drm/i915/gt/intel_gt_pm.c | 10 +++--
drivers/gpu/drm/i915/gt/intel_gt_pm.h | 36 ++++++++++++----
drivers/gpu/drm/i915/gt/intel_gt_pm_debugfs.c | 4 +-
drivers/gpu/drm/i915/gt/selftest_engine_cs.c | 20 +++++----
drivers/gpu/drm/i915/gt/selftest_gt_pm.c | 5 ++-
drivers/gpu/drm/i915/gt/selftest_reset.c | 10 +++--
drivers/gpu/drm/i915/gt/selftest_rps.c | 17 ++++----
drivers/gpu/drm/i915/gt/selftest_slpc.c | 10 +++--
.../gpu/drm/i915/gt/uc/intel_guc_submission.c | 9 ++--
drivers/gpu/drm/i915/i915_pmu.c | 16 +++----
drivers/gpu/drm/i915/intel_wakeref.c | 4 ++
drivers/gpu/drm/i915/intel_wakeref.h | 42 +++++++++++++++++++
21 files changed, 182 insertions(+), 71 deletions(-)

diff --git a/drivers/gpu/drm/i915/Kconfig.debug b/drivers/gpu/drm/i915/Kconfig.debug
index 8b1973146e848..3bdc73f30a9e1 100644
--- a/drivers/gpu/drm/i915/Kconfig.debug
+++ b/drivers/gpu/drm/i915/Kconfig.debug
@@ -48,6 +48,7 @@ config DRM_I915_DEBUG
select DRM_I915_DEBUG_MMIO
select DRM_I915_TRACK_WAKEREF
select DRM_I915_DEBUG_RUNTIME_PM
+ select DRM_I915_DEBUG_WAKEREF
select DRM_I915_SW_FENCE_DEBUG_OBJECTS
select DRM_I915_SELFTEST
select BROKEN # for prototype uAPI
@@ -257,3 +258,17 @@ config DRM_I915_DEBUG_RUNTIME_PM
Recommended for driver developers only.

If in doubt, say "N"
+
+config DRM_I915_DEBUG_WAKEREF
+ bool "Enable extra tracking for wakerefs"
+ depends on DRM_I915
+ default n
+ select STACKDEPOT
+ select STACKTRACE
+ select DRM_I915_TRACK_WAKEREF
+ help
+ Choose this option to turn on extra state checking and usage
+ tracking for the wakerefPM functionality. This may introduce
+ overhead during driver runtime.
+
+ If in doubt, say "N"
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
index 13c975da77474..4b6c144f706da 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
@@ -252,6 +252,7 @@ struct i915_execbuffer {
struct intel_gt *gt; /* gt for the execbuf */
struct intel_context *context; /* logical state for the request */
struct i915_gem_context *gem_context; /** caller's context */
+ intel_wakeref_t wakeref;

/** our requests to build */
struct i915_request *requests[MAX_ENGINE_INSTANCE + 1];
@@ -2679,7 +2680,7 @@ eb_select_engine(struct i915_execbuffer *eb)

for_each_child(ce, child)
intel_context_get(child);
- intel_gt_pm_get(ce->engine->gt);
+ eb->wakeref = intel_gt_pm_get(ce->engine->gt);

if (!test_bit(CONTEXT_ALLOC_BIT, &ce->flags)) {
err = intel_context_alloc_state(ce);
@@ -2713,7 +2714,7 @@ eb_select_engine(struct i915_execbuffer *eb)
return err;

err:
- intel_gt_pm_put(ce->engine->gt);
+ intel_gt_pm_put(ce->engine->gt, eb->wakeref);
for_each_child(ce, child)
intel_context_put(child);
intel_context_put(ce);
@@ -2725,7 +2726,7 @@ eb_put_engine(struct i915_execbuffer *eb)
{
struct intel_context *child;

- intel_gt_pm_put(eb->gt);
+ intel_gt_pm_put(eb->context->engine->gt, eb->wakeref);
for_each_child(eb->context, child)
intel_context_put(child);
intel_context_put(eb->context);
diff --git a/drivers/gpu/drm/i915/gem/selftests/i915_gem_coherency.c b/drivers/gpu/drm/i915/gem/selftests/i915_gem_coherency.c
index 13b088cc787eb..553f2730c2a76 100644
--- a/drivers/gpu/drm/i915/gem/selftests/i915_gem_coherency.c
+++ b/drivers/gpu/drm/i915/gem/selftests/i915_gem_coherency.c
@@ -85,6 +85,7 @@ static int cpu_get(struct context *ctx, unsigned long offset, u32 *v)

static int gtt_set(struct context *ctx, unsigned long offset, u32 v)
{
+ intel_wakeref_t wakeref;
struct i915_vma *vma;
u32 __iomem *map;
int err = 0;
@@ -99,7 +100,7 @@ static int gtt_set(struct context *ctx, unsigned long offset, u32 v)
if (IS_ERR(vma))
return PTR_ERR(vma);

- intel_gt_pm_get(vma->vm->gt);
+ wakeref = intel_gt_pm_get(vma->vm->gt);

map = i915_vma_pin_iomap(vma);
i915_vma_unpin(vma);
@@ -112,12 +113,13 @@ static int gtt_set(struct context *ctx, unsigned long offset, u32 v)
i915_vma_unpin_iomap(vma);

out_rpm:
- intel_gt_pm_put(vma->vm->gt);
+ intel_gt_pm_put(vma->vm->gt, wakeref);
return err;
}

static int gtt_get(struct context *ctx, unsigned long offset, u32 *v)
{
+ intel_wakeref_t wakeref;
struct i915_vma *vma;
u32 __iomem *map;
int err = 0;
@@ -132,7 +134,7 @@ static int gtt_get(struct context *ctx, unsigned long offset, u32 *v)
if (IS_ERR(vma))
return PTR_ERR(vma);

- intel_gt_pm_get(vma->vm->gt);
+ wakeref = intel_gt_pm_get(vma->vm->gt);

map = i915_vma_pin_iomap(vma);
i915_vma_unpin(vma);
@@ -145,7 +147,7 @@ static int gtt_get(struct context *ctx, unsigned long offset, u32 *v)
i915_vma_unpin_iomap(vma);

out_rpm:
- intel_gt_pm_put(vma->vm->gt);
+ intel_gt_pm_put(vma->vm->gt, wakeref);
return err;
}

diff --git a/drivers/gpu/drm/i915/gem/selftests/i915_gem_mman.c b/drivers/gpu/drm/i915/gem/selftests/i915_gem_mman.c
index 8ae1a1530bd80..dea5e8e39ab2d 100644
--- a/drivers/gpu/drm/i915/gem/selftests/i915_gem_mman.c
+++ b/drivers/gpu/drm/i915/gem/selftests/i915_gem_mman.c
@@ -624,14 +624,14 @@ static bool assert_mmap_offset(struct drm_i915_private *i915,
static void disable_retire_worker(struct drm_i915_private *i915)
{
i915_gem_driver_unregister__shrinker(i915);
- intel_gt_pm_get(to_gt(i915));
+ intel_gt_pm_get_untracked(to_gt(i915));
cancel_delayed_work_sync(&to_gt(i915)->requests.retire_work);
}

static void restore_retire_worker(struct drm_i915_private *i915)
{
igt_flush_test(i915);
- intel_gt_pm_put(to_gt(i915));
+ intel_gt_pm_put_untracked(to_gt(i915));
i915_gem_driver_register__shrinker(i915);
}

@@ -772,6 +772,7 @@ static int igt_mmap_offset_exhaustion(void *arg)

static int gtt_set(struct drm_i915_gem_object *obj)
{
+ intel_wakeref_t wakeref;
struct i915_vma *vma;
void __iomem *map;
int err = 0;
@@ -780,7 +781,7 @@ static int gtt_set(struct drm_i915_gem_object *obj)
if (IS_ERR(vma))
return PTR_ERR(vma);

- intel_gt_pm_get(vma->vm->gt);
+ wakeref = intel_gt_pm_get(vma->vm->gt);
map = i915_vma_pin_iomap(vma);
i915_vma_unpin(vma);
if (IS_ERR(map)) {
@@ -792,12 +793,13 @@ static int gtt_set(struct drm_i915_gem_object *obj)
i915_vma_unpin_iomap(vma);

out:
- intel_gt_pm_put(vma->vm->gt);
+ intel_gt_pm_put(vma->vm->gt, wakeref);
return err;
}

static int gtt_check(struct drm_i915_gem_object *obj)
{
+ intel_wakeref_t wakeref;
struct i915_vma *vma;
void __iomem *map;
int err = 0;
@@ -806,7 +808,7 @@ static int gtt_check(struct drm_i915_gem_object *obj)
if (IS_ERR(vma))
return PTR_ERR(vma);

- intel_gt_pm_get(vma->vm->gt);
+ wakeref = intel_gt_pm_get(vma->vm->gt);
map = i915_vma_pin_iomap(vma);
i915_vma_unpin(vma);
if (IS_ERR(map)) {
@@ -822,7 +824,7 @@ static int gtt_check(struct drm_i915_gem_object *obj)
i915_vma_unpin_iomap(vma);

out:
- intel_gt_pm_put(vma->vm->gt);
+ intel_gt_pm_put(vma->vm->gt, wakeref);
return err;
}

diff --git a/drivers/gpu/drm/i915/gt/intel_breadcrumbs.c b/drivers/gpu/drm/i915/gt/intel_breadcrumbs.c
index 209cf265bf746..f061d93c27357 100644
--- a/drivers/gpu/drm/i915/gt/intel_breadcrumbs.c
+++ b/drivers/gpu/drm/i915/gt/intel_breadcrumbs.c
@@ -27,11 +27,14 @@ static void irq_disable(struct intel_breadcrumbs *b)

static void __intel_breadcrumbs_arm_irq(struct intel_breadcrumbs *b)
{
+ intel_wakeref_t wakeref;
+
/*
* Since we are waiting on a request, the GPU should be busy
* and should have its own rpm reference.
*/
- if (GEM_WARN_ON(!intel_gt_pm_get_if_awake(b->irq_engine->gt)))
+ wakeref = intel_gt_pm_get_if_awake(b->irq_engine->gt);
+ if (GEM_WARN_ON(!wakeref))
return;

/*
@@ -40,7 +43,7 @@ static void __intel_breadcrumbs_arm_irq(struct intel_breadcrumbs *b)
* which we can add a new waiter and avoid the cost of re-enabling
* the irq.
*/
- WRITE_ONCE(b->irq_armed, true);
+ WRITE_ONCE(b->irq_armed, wakeref);

/* Requests may have completed before we could enable the interrupt. */
if (!b->irq_enabled++ && b->irq_enable(b))
@@ -60,12 +63,14 @@ static void intel_breadcrumbs_arm_irq(struct intel_breadcrumbs *b)

static void __intel_breadcrumbs_disarm_irq(struct intel_breadcrumbs *b)
{
+ intel_wakeref_t wakeref = b->irq_armed;
+
GEM_BUG_ON(!b->irq_enabled);
if (!--b->irq_enabled)
b->irq_disable(b);

- WRITE_ONCE(b->irq_armed, false);
- intel_gt_pm_put_async(b->irq_engine->gt);
+ WRITE_ONCE(b->irq_armed, 0);
+ intel_gt_pm_put_async(b->irq_engine->gt, wakeref);
}

static void intel_breadcrumbs_disarm_irq(struct intel_breadcrumbs *b)
diff --git a/drivers/gpu/drm/i915/gt/intel_breadcrumbs_types.h b/drivers/gpu/drm/i915/gt/intel_breadcrumbs_types.h
index 72dfd3748c4c3..bdf09fd67b6e7 100644
--- a/drivers/gpu/drm/i915/gt/intel_breadcrumbs_types.h
+++ b/drivers/gpu/drm/i915/gt/intel_breadcrumbs_types.h
@@ -13,6 +13,7 @@
#include <linux/types.h>

#include "intel_engine_types.h"
+#include "intel_wakeref.h"

/*
* Rather than have every client wait upon all user interrupts,
@@ -43,7 +44,7 @@ struct intel_breadcrumbs {
spinlock_t irq_lock; /* protects the interrupt from hardirq context */
struct irq_work irq_work; /* for use from inside irq_lock */
unsigned int irq_enabled;
- bool irq_armed;
+ intel_wakeref_t irq_armed;

/* Not all breadcrumbs are attached to physical HW */
intel_engine_mask_t engine_mask;
diff --git a/drivers/gpu/drm/i915/gt/intel_engine_pm.c b/drivers/gpu/drm/i915/gt/intel_engine_pm.c
index b0a4a2dbe3ee9..52e46e7830ff5 100644
--- a/drivers/gpu/drm/i915/gt/intel_engine_pm.c
+++ b/drivers/gpu/drm/i915/gt/intel_engine_pm.c
@@ -47,7 +47,7 @@ static int __engine_unpark(struct intel_wakeref *wf)

ENGINE_TRACE(engine, "\n");

- intel_gt_pm_get(engine->gt);
+ engine->wakeref_track = intel_gt_pm_get(engine->gt);

/* Discard stale context state from across idling */
ce = engine->kernel_context;
@@ -260,7 +260,7 @@ static int __engine_park(struct intel_wakeref *wf)
engine->park(engine);

/* While gt calls i915_vma_parked(), we have to break the lock cycle */
- intel_gt_pm_put_async(engine->gt);
+ intel_gt_pm_put_async(engine->gt, engine->wakeref_track);
return 0;
}

diff --git a/drivers/gpu/drm/i915/gt/intel_engine_types.h b/drivers/gpu/drm/i915/gt/intel_engine_types.h
index 36365bdbe1ee7..dcd84d1eb90b7 100644
--- a/drivers/gpu/drm/i915/gt/intel_engine_types.h
+++ b/drivers/gpu/drm/i915/gt/intel_engine_types.h
@@ -382,7 +382,9 @@ struct intel_engine_cs {
unsigned long serial;

unsigned long wakeref_serial;
+ intel_wakeref_t wakeref_track;
struct intel_wakeref wakeref;
+
struct file *default_state;

struct {
diff --git a/drivers/gpu/drm/i915/gt/intel_execlists_submission.c b/drivers/gpu/drm/i915/gt/intel_execlists_submission.c
index 961d795220a30..4ff269b2697d5 100644
--- a/drivers/gpu/drm/i915/gt/intel_execlists_submission.c
+++ b/drivers/gpu/drm/i915/gt/intel_execlists_submission.c
@@ -630,7 +630,7 @@ static void __execlists_schedule_out(struct i915_request * const rq,
execlists_context_status_change(rq, INTEL_CONTEXT_SCHEDULE_OUT);
if (engine->fw_domain && !--engine->fw_active)
intel_uncore_forcewake_put(engine->uncore, engine->fw_domain);
- intel_gt_pm_put_async(engine->gt);
+ intel_gt_pm_put_async_untracked(engine->gt);

/*
* If this is part of a virtual engine, its next request may
diff --git a/drivers/gpu/drm/i915/gt/intel_gt_pm.c b/drivers/gpu/drm/i915/gt/intel_gt_pm.c
index c0fa41e4c8030..7ee65a93f926f 100644
--- a/drivers/gpu/drm/i915/gt/intel_gt_pm.c
+++ b/drivers/gpu/drm/i915/gt/intel_gt_pm.c
@@ -25,19 +25,20 @@
static void user_forcewake(struct intel_gt *gt, bool suspend)
{
int count = atomic_read(&gt->user_wakeref);
+ intel_wakeref_t wakeref;

/* Inside suspend/resume so single threaded, no races to worry about. */
if (likely(!count))
return;

- intel_gt_pm_get(gt);
+ wakeref = intel_gt_pm_get(gt);
if (suspend) {
GEM_BUG_ON(count > atomic_read(&gt->wakeref.count));
atomic_sub(count, &gt->wakeref.count);
} else {
atomic_add(count, &gt->wakeref.count);
}
- intel_gt_pm_put(gt);
+ intel_gt_pm_put(gt, wakeref);
}

static void runtime_begin(struct intel_gt *gt)
@@ -210,6 +211,7 @@ int intel_gt_resume(struct intel_gt *gt)
{
struct intel_engine_cs *engine;
enum intel_engine_id id;
+ intel_wakeref_t wakeref;
int err;

err = intel_gt_has_unrecoverable_error(gt);
@@ -226,7 +228,7 @@ int intel_gt_resume(struct intel_gt *gt)
*/
gt_sanitize(gt, true);

- intel_gt_pm_get(gt);
+ wakeref = intel_gt_pm_get(gt);

intel_uncore_forcewake_get(gt->uncore, FORCEWAKE_ALL);
intel_rc6_sanitize(&gt->rc6);
@@ -273,7 +275,7 @@ int intel_gt_resume(struct intel_gt *gt)

out_fw:
intel_uncore_forcewake_put(gt->uncore, FORCEWAKE_ALL);
- intel_gt_pm_put(gt);
+ intel_gt_pm_put(gt, wakeref);
return err;

err_wedged:
diff --git a/drivers/gpu/drm/i915/gt/intel_gt_pm.h b/drivers/gpu/drm/i915/gt/intel_gt_pm.h
index bc898df7a48cc..3ab06d897df25 100644
--- a/drivers/gpu/drm/i915/gt/intel_gt_pm.h
+++ b/drivers/gpu/drm/i915/gt/intel_gt_pm.h
@@ -16,19 +16,28 @@ static inline bool intel_gt_pm_is_awake(const struct intel_gt *gt)
return intel_wakeref_is_active(&gt->wakeref);
}

-static inline void intel_gt_pm_get(struct intel_gt *gt)
+static inline void intel_gt_pm_get_untracked(struct intel_gt *gt)
{
intel_wakeref_get(&gt->wakeref);
}

+static inline intel_wakeref_t intel_gt_pm_get(struct intel_gt *gt)
+{
+ intel_gt_pm_get_untracked(gt);
+ return intel_wakeref_track(&gt->wakeref);
+}
+
static inline void __intel_gt_pm_get(struct intel_gt *gt)
{
__intel_wakeref_get(&gt->wakeref);
}

-static inline bool intel_gt_pm_get_if_awake(struct intel_gt *gt)
+static inline intel_wakeref_t intel_gt_pm_get_if_awake(struct intel_gt *gt)
{
- return intel_wakeref_get_if_active(&gt->wakeref);
+ if (!intel_wakeref_get_if_active(&gt->wakeref))
+ return 0;
+
+ return intel_wakeref_track(&gt->wakeref);
}

static inline void intel_gt_pm_might_get(struct intel_gt *gt)
@@ -36,12 +45,18 @@ static inline void intel_gt_pm_might_get(struct intel_gt *gt)
intel_wakeref_might_get(&gt->wakeref);
}

-static inline void intel_gt_pm_put(struct intel_gt *gt)
+static inline void intel_gt_pm_put_untracked(struct intel_gt *gt)
{
intel_wakeref_put(&gt->wakeref);
}

-static inline void intel_gt_pm_put_async(struct intel_gt *gt)
+static inline void intel_gt_pm_put(struct intel_gt *gt, intel_wakeref_t handle)
+{
+ intel_wakeref_untrack(&gt->wakeref, handle);
+ intel_gt_pm_put_untracked(gt);
+}
+
+static inline void intel_gt_pm_put_async_untracked(struct intel_gt *gt)
{
intel_wakeref_put_async(&gt->wakeref);
}
@@ -51,9 +66,14 @@ static inline void intel_gt_pm_might_put(struct intel_gt *gt)
intel_wakeref_might_put(&gt->wakeref);
}

-#define with_intel_gt_pm(gt, tmp) \
- for (tmp = 1, intel_gt_pm_get(gt); tmp; \
- intel_gt_pm_put(gt), tmp = 0)
+static inline void intel_gt_pm_put_async(struct intel_gt *gt, intel_wakeref_t handle)
+{
+ intel_wakeref_untrack(&gt->wakeref, handle);
+ intel_gt_pm_put_async_untracked(gt);
+}
+
+#define with_intel_gt_pm(gt, wf) \
+ for (wf = intel_gt_pm_get(gt); wf; intel_gt_pm_put(gt, wf), wf = 0)

static inline int intel_gt_pm_wait_for_idle(struct intel_gt *gt)
{
diff --git a/drivers/gpu/drm/i915/gt/intel_gt_pm_debugfs.c b/drivers/gpu/drm/i915/gt/intel_gt_pm_debugfs.c
index 37765919fe322..e02a3e26e0d02 100644
--- a/drivers/gpu/drm/i915/gt/intel_gt_pm_debugfs.c
+++ b/drivers/gpu/drm/i915/gt/intel_gt_pm_debugfs.c
@@ -26,7 +26,7 @@
int intel_gt_pm_debugfs_forcewake_user_open(struct intel_gt *gt)
{
atomic_inc(&gt->user_wakeref);
- intel_gt_pm_get(gt);
+ intel_gt_pm_get_untracked(gt);
if (GRAPHICS_VER(gt->i915) >= 6)
intel_uncore_forcewake_user_get(gt->uncore);

@@ -37,7 +37,7 @@ int intel_gt_pm_debugfs_forcewake_user_release(struct intel_gt *gt)
{
if (GRAPHICS_VER(gt->i915) >= 6)
intel_uncore_forcewake_user_put(gt->uncore);
- intel_gt_pm_put(gt);
+ intel_gt_pm_put_untracked(gt);
atomic_dec(&gt->user_wakeref);

return 0;
diff --git a/drivers/gpu/drm/i915/gt/selftest_engine_cs.c b/drivers/gpu/drm/i915/gt/selftest_engine_cs.c
index 1b75f478d1b83..8ea6bf4c987e2 100644
--- a/drivers/gpu/drm/i915/gt/selftest_engine_cs.c
+++ b/drivers/gpu/drm/i915/gt/selftest_engine_cs.c
@@ -21,20 +21,22 @@ static int cmp_u32(const void *A, const void *B)
return *a - *b;
}

-static void perf_begin(struct intel_gt *gt)
+static intel_wakeref_t perf_begin(struct intel_gt *gt)
{
- intel_gt_pm_get(gt);
+ intel_wakeref_t wakeref = intel_gt_pm_get(gt);

/* Boost gpufreq to max [waitboost] and keep it fixed */
atomic_inc(&gt->rps.num_waiters);
schedule_work(&gt->rps.work);
flush_work(&gt->rps.work);
+
+ return wakeref;
}

-static int perf_end(struct intel_gt *gt)
+static int perf_end(struct intel_gt *gt, intel_wakeref_t wakeref)
{
atomic_dec(&gt->rps.num_waiters);
- intel_gt_pm_put(gt);
+ intel_gt_pm_put(gt, wakeref);

return igt_flush_test(gt->i915);
}
@@ -123,12 +125,13 @@ static int perf_mi_bb_start(void *arg)
struct intel_gt *gt = arg;
struct intel_engine_cs *engine;
enum intel_engine_id id;
+ intel_wakeref_t wakeref;
int err = 0;

if (GRAPHICS_VER(gt->i915) < 7) /* for per-engine CS_TIMESTAMP */
return 0;

- perf_begin(gt);
+ wakeref = perf_begin(gt);
for_each_engine(engine, gt, id) {
struct intel_context *ce = engine->kernel_context;
struct i915_vma *batch;
@@ -194,7 +197,7 @@ static int perf_mi_bb_start(void *arg)
pr_info("%s: MI_BB_START cycles: %u\n",
engine->name, trifilter(cycles));
}
- if (perf_end(gt))
+ if (perf_end(gt, wakeref))
err = -EIO;

return err;
@@ -247,12 +250,13 @@ static int perf_mi_noop(void *arg)
struct intel_gt *gt = arg;
struct intel_engine_cs *engine;
enum intel_engine_id id;
+ intel_wakeref_t wakeref;
int err = 0;

if (GRAPHICS_VER(gt->i915) < 7) /* for per-engine CS_TIMESTAMP */
return 0;

- perf_begin(gt);
+ wakeref = perf_begin(gt);
for_each_engine(engine, gt, id) {
struct intel_context *ce = engine->kernel_context;
struct i915_vma *base, *nop;
@@ -348,7 +352,7 @@ static int perf_mi_noop(void *arg)
pr_info("%s: 16K MI_NOOP cycles: %u\n",
engine->name, trifilter(cycles));
}
- if (perf_end(gt))
+ if (perf_end(gt, wakeref))
err = -EIO;

return err;
diff --git a/drivers/gpu/drm/i915/gt/selftest_gt_pm.c b/drivers/gpu/drm/i915/gt/selftest_gt_pm.c
index be94f863bdeff..f0f9983a6fbb2 100644
--- a/drivers/gpu/drm/i915/gt/selftest_gt_pm.c
+++ b/drivers/gpu/drm/i915/gt/selftest_gt_pm.c
@@ -68,6 +68,7 @@ static int live_gt_clocks(void *arg)
struct intel_gt *gt = arg;
struct intel_engine_cs *engine;
enum intel_engine_id id;
+ intel_wakeref_t wakeref;
int err = 0;

if (!gt->clock_frequency) { /* unknown */
@@ -97,7 +98,7 @@ static int live_gt_clocks(void *arg)
*/
return 0;

- intel_gt_pm_get(gt);
+ wakeref = intel_gt_pm_get(gt);
intel_uncore_forcewake_get(gt->uncore, FORCEWAKE_ALL);

for_each_engine(engine, gt, id) {
@@ -134,7 +135,7 @@ static int live_gt_clocks(void *arg)
}

intel_uncore_forcewake_put(gt->uncore, FORCEWAKE_ALL);
- intel_gt_pm_put(gt);
+ intel_gt_pm_put(gt, wakeref);

return err;
}
diff --git a/drivers/gpu/drm/i915/gt/selftest_reset.c b/drivers/gpu/drm/i915/gt/selftest_reset.c
index 37c38bdd5f474..cb01901c94e94 100644
--- a/drivers/gpu/drm/i915/gt/selftest_reset.c
+++ b/drivers/gpu/drm/i915/gt/selftest_reset.c
@@ -257,11 +257,12 @@ static int igt_atomic_reset(void *arg)
{
struct intel_gt *gt = arg;
const typeof(*igt_atomic_phases) *p;
+ intel_wakeref_t wakeref;
int err = 0;

/* Check that the resets are usable from atomic context */

- intel_gt_pm_get(gt);
+ wakeref = intel_gt_pm_get(gt);
igt_global_reset_lock(gt);

/* Flush any requests before we get started and check basics */
@@ -292,7 +293,7 @@ static int igt_atomic_reset(void *arg)

unlock:
igt_global_reset_unlock(gt);
- intel_gt_pm_put(gt);
+ intel_gt_pm_put(gt, wakeref);

return err;
}
@@ -303,6 +304,7 @@ static int igt_atomic_engine_reset(void *arg)
const typeof(*igt_atomic_phases) *p;
struct intel_engine_cs *engine;
enum intel_engine_id id;
+ intel_wakeref_t wakeref;
int err = 0;

/* Check that the resets are usable from atomic context */
@@ -313,7 +315,7 @@ static int igt_atomic_engine_reset(void *arg)
if (intel_uc_uses_guc_submission(&gt->uc))
return 0;

- intel_gt_pm_get(gt);
+ wakeref = intel_gt_pm_get(gt);
igt_global_reset_lock(gt);

/* Flush any requests before we get started and check basics */
@@ -361,7 +363,7 @@ static int igt_atomic_engine_reset(void *arg)

out_unlock:
igt_global_reset_unlock(gt);
- intel_gt_pm_put(gt);
+ intel_gt_pm_put(gt, wakeref);

return err;
}
diff --git a/drivers/gpu/drm/i915/gt/selftest_rps.c b/drivers/gpu/drm/i915/gt/selftest_rps.c
index 6a69ac0184ad8..7effd09ced988 100644
--- a/drivers/gpu/drm/i915/gt/selftest_rps.c
+++ b/drivers/gpu/drm/i915/gt/selftest_rps.c
@@ -223,6 +223,7 @@ int live_rps_clock_interval(void *arg)
struct intel_engine_cs *engine;
enum intel_engine_id id;
struct igt_spinner spin;
+ intel_wakeref_t wakeref;
int err = 0;

if (!intel_rps_is_enabled(rps) || GRAPHICS_VER(gt->i915) < 6)
@@ -235,7 +236,7 @@ int live_rps_clock_interval(void *arg)
saved_work = rps->work.func;
rps->work.func = dummy_rps_work;

- intel_gt_pm_get(gt);
+ wakeref = intel_gt_pm_get(gt);
intel_rps_disable(&gt->rps);

intel_gt_check_clock_frequency(gt);
@@ -354,7 +355,7 @@ int live_rps_clock_interval(void *arg)
}

intel_rps_enable(&gt->rps);
- intel_gt_pm_put(gt);
+ intel_gt_pm_put(gt, wakeref);

igt_spinner_fini(&spin);

@@ -375,6 +376,7 @@ int live_rps_control(void *arg)
struct intel_engine_cs *engine;
enum intel_engine_id id;
struct igt_spinner spin;
+ intel_wakeref_t wakeref;
int err = 0;

/*
@@ -397,7 +399,7 @@ int live_rps_control(void *arg)
saved_work = rps->work.func;
rps->work.func = dummy_rps_work;

- intel_gt_pm_get(gt);
+ wakeref = intel_gt_pm_get(gt);
for_each_engine(engine, gt, id) {
struct i915_request *rq;
ktime_t min_dt, max_dt;
@@ -487,7 +489,7 @@ int live_rps_control(void *arg)
break;
}
}
- intel_gt_pm_put(gt);
+ intel_gt_pm_put(gt, wakeref);

igt_spinner_fini(&spin);

@@ -1026,6 +1028,7 @@ int live_rps_interrupt(void *arg)
struct intel_engine_cs *engine;
enum intel_engine_id id;
struct igt_spinner spin;
+ intel_wakeref_t wakeref;
u32 pm_events;
int err = 0;

@@ -1036,9 +1039,9 @@ int live_rps_interrupt(void *arg)
if (!intel_rps_has_interrupts(rps) || GRAPHICS_VER(gt->i915) < 6)
return 0;

- intel_gt_pm_get(gt);
- pm_events = rps->pm_events;
- intel_gt_pm_put(gt);
+ pm_events = 0;
+ with_intel_gt_pm(gt, wakeref)
+ pm_events = rps->pm_events;
if (!pm_events) {
pr_err("No RPS PM events registered, but RPS is enabled?\n");
return -ENODEV;
diff --git a/drivers/gpu/drm/i915/gt/selftest_slpc.c b/drivers/gpu/drm/i915/gt/selftest_slpc.c
index b768cea5943dd..27be3c9b29b13 100644
--- a/drivers/gpu/drm/i915/gt/selftest_slpc.c
+++ b/drivers/gpu/drm/i915/gt/selftest_slpc.c
@@ -44,6 +44,7 @@ static int live_slpc_clamp_min(void *arg)
struct intel_rps *rps = &gt->rps;
struct intel_engine_cs *engine;
enum intel_engine_id id;
+ intel_wakeref_t wakeref;
struct igt_spinner spin;
u32 slpc_min_freq, slpc_max_freq;
int err = 0;
@@ -70,7 +71,7 @@ static int live_slpc_clamp_min(void *arg)
}

intel_gt_pm_wait_for_idle(gt);
- intel_gt_pm_get(gt);
+ wakeref = intel_gt_pm_get(gt);
for_each_engine(engine, gt, id) {
struct i915_request *rq;
u32 step, min_freq, req_freq;
@@ -156,7 +157,7 @@ static int live_slpc_clamp_min(void *arg)
if (igt_flush_test(gt->i915))
err = -EIO;

- intel_gt_pm_put(gt);
+ intel_gt_pm_put(gt, wakeref);
igt_spinner_fini(&spin);
intel_gt_pm_wait_for_idle(gt);

@@ -171,6 +172,7 @@ static int live_slpc_clamp_max(void *arg)
struct intel_rps *rps;
struct intel_engine_cs *engine;
enum intel_engine_id id;
+ intel_wakeref_t wakeref;
struct igt_spinner spin;
int err = 0;
u32 slpc_min_freq, slpc_max_freq;
@@ -200,7 +202,7 @@ static int live_slpc_clamp_max(void *arg)
}

intel_gt_pm_wait_for_idle(gt);
- intel_gt_pm_get(gt);
+ wakeref = intel_gt_pm_get(gt);
for_each_engine(engine, gt, id) {
struct i915_request *rq;
u32 max_freq, req_freq;
@@ -290,7 +292,7 @@ static int live_slpc_clamp_max(void *arg)
slpc_set_max_freq(slpc, slpc_max_freq);
slpc_set_min_freq(slpc, slpc_min_freq);

- intel_gt_pm_put(gt);
+ intel_gt_pm_put(gt, wakeref);
igt_spinner_fini(&spin);
intel_gt_pm_wait_for_idle(gt);

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 b3a429a92c0da..7799939c38945 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
+++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
@@ -1048,7 +1048,7 @@ static void scrub_guc_desc_for_outstanding_g2h(struct intel_guc *guc)
if (deregister)
guc_signal_context_fence(ce);
if (destroyed) {
- intel_gt_pm_put_async(guc_to_gt(guc));
+ intel_gt_pm_put_async_untracked(guc_to_gt(guc));
release_guc_id(guc, ce);
__guc_context_destroy(ce);
}
@@ -1254,6 +1254,7 @@ static ktime_t guc_engine_busyness(struct intel_engine_cs *engine, ktime_t *now)
unsigned long flags;
u32 reset_count;
bool in_reset;
+ intel_wakeref_t wakeref;

spin_lock_irqsave(&guc->timestamp.lock, flags);

@@ -1276,7 +1277,7 @@ static ktime_t guc_engine_busyness(struct intel_engine_cs *engine, ktime_t *now)
* start_gt_clk is derived from GuC state. To get a consistent
* view of activity, we query the GuC state only if gt is awake.
*/
- if (!in_reset && intel_gt_pm_get_if_awake(gt)) {
+ if (!in_reset && (wakeref = intel_gt_pm_get_if_awake(gt))) {
stats_saved = *stats;
gt_stamp_saved = guc->timestamp.gt_stamp;
/*
@@ -1285,7 +1286,7 @@ static ktime_t guc_engine_busyness(struct intel_engine_cs *engine, ktime_t *now)
*/
guc_update_engine_gt_clks(engine);
guc_update_pm_timestamp(guc, now);
- intel_gt_pm_put_async(gt);
+ intel_gt_pm_put_async(gt, wakeref);
if (i915_reset_count(gpu_error) != reset_count) {
*stats = stats_saved;
guc->timestamp.gt_stamp = gt_stamp_saved;
@@ -3903,7 +3904,7 @@ int intel_guc_deregister_done_process_msg(struct intel_guc *guc,
intel_context_put(ce);
} else if (context_destroyed(ce)) {
/* Context has been destroyed */
- intel_gt_pm_put_async(guc_to_gt(guc));
+ intel_gt_pm_put_async_untracked(guc_to_gt(guc));
release_guc_id(guc, ce);
__guc_context_destroy(ce);
}
diff --git a/drivers/gpu/drm/i915/i915_pmu.c b/drivers/gpu/drm/i915/i915_pmu.c
index cfc21042499d0..3bd0c75c2ee69 100644
--- a/drivers/gpu/drm/i915/i915_pmu.c
+++ b/drivers/gpu/drm/i915/i915_pmu.c
@@ -171,19 +171,19 @@ static u64 get_rc6(struct intel_gt *gt)
{
struct drm_i915_private *i915 = gt->i915;
struct i915_pmu *pmu = &i915->pmu;
+ intel_wakeref_t wakeref;
unsigned long flags;
- bool awake = false;
u64 val;

- if (intel_gt_pm_get_if_awake(gt)) {
+ wakeref = intel_gt_pm_get_if_awake(gt);
+ if (wakeref) {
val = __get_rc6(gt);
- intel_gt_pm_put_async(gt);
- awake = true;
+ intel_gt_pm_put_async(gt, wakeref);
}

spin_lock_irqsave(&pmu->lock, flags);

- if (awake) {
+ if (wakeref) {
pmu->sample[__I915_SAMPLE_RC6].cur = val;
} else {
/*
@@ -377,12 +377,14 @@ frequency_sample(struct intel_gt *gt, unsigned int period_ns)
struct intel_uncore *uncore = gt->uncore;
struct i915_pmu *pmu = &i915->pmu;
struct intel_rps *rps = &gt->rps;
+ intel_wakeref_t wakeref;

if (!frequency_sampling_enabled(pmu))
return;

/* Report 0/0 (actual/requested) frequency while parked. */
- if (!intel_gt_pm_get_if_awake(gt))
+ wakeref = intel_gt_pm_get_if_awake(gt);
+ if (!wakeref)
return;

if (pmu->enable & config_mask(I915_PMU_ACTUAL_FREQUENCY)) {
@@ -413,7 +415,7 @@ frequency_sample(struct intel_gt *gt, unsigned int period_ns)
period_ns / 1000);
}

- intel_gt_pm_put_async(gt);
+ intel_gt_pm_put_async(gt, wakeref);
}

static enum hrtimer_restart i915_sample(struct hrtimer *hrtimer)
diff --git a/drivers/gpu/drm/i915/intel_wakeref.c b/drivers/gpu/drm/i915/intel_wakeref.c
index dfd87d0822180..db4887e33ea60 100644
--- a/drivers/gpu/drm/i915/intel_wakeref.c
+++ b/drivers/gpu/drm/i915/intel_wakeref.c
@@ -108,6 +108,10 @@ void __intel_wakeref_init(struct intel_wakeref *wf,
INIT_DELAYED_WORK(&wf->work, __intel_wakeref_put_work);
lockdep_init_map(&wf->work.work.lockdep_map,
"wakeref.work", &key->work, 0);
+
+#if IS_ENABLED(CONFIG_DRM_I915_DEBUG_WAKEREF)
+ intel_wakeref_tracker_init(&wf->debug);
+#endif
}

int intel_wakeref_wait_for_idle(struct intel_wakeref *wf)
diff --git a/drivers/gpu/drm/i915/intel_wakeref.h b/drivers/gpu/drm/i915/intel_wakeref.h
index e6ba389652d74..38439deefc5cc 100644
--- a/drivers/gpu/drm/i915/intel_wakeref.h
+++ b/drivers/gpu/drm/i915/intel_wakeref.h
@@ -43,6 +43,10 @@ struct intel_wakeref {
const struct intel_wakeref_ops *ops;

struct delayed_work work;
+
+#if IS_ENABLED(CONFIG_DRM_I915_DEBUG_WAKEREF)
+ struct intel_wakeref_tracker debug;
+#endif
};

struct intel_wakeref_lockclass {
@@ -262,6 +266,44 @@ __intel_wakeref_defer_park(struct intel_wakeref *wf)
*/
int intel_wakeref_wait_for_idle(struct intel_wakeref *wf);

+#if IS_ENABLED(CONFIG_DRM_I915_DEBUG_WAKEREF)
+
+static inline intel_wakeref_t intel_wakeref_track(struct intel_wakeref *wf)
+{
+ return intel_wakeref_tracker_add(&wf->debug);
+}
+
+static inline void intel_wakeref_untrack(struct intel_wakeref *wf,
+ intel_wakeref_t handle)
+{
+ intel_wakeref_tracker_remove(&wf->debug, handle);
+}
+
+static inline void intel_wakeref_show(struct intel_wakeref *wf,
+ struct drm_printer *p)
+{
+ intel_wakeref_tracker_show(&wf->debug, p);
+}
+
+#else
+
+static inline intel_wakeref_t intel_wakeref_track(struct intel_wakeref *wf)
+{
+ return -1;
+}
+
+static inline void intel_wakeref_untrack(struct intel_wakeref *wf,
+ intel_wakeref_t handle)
+{
+}
+
+static inline void intel_wakeref_show(struct intel_wakeref *wf,
+ struct drm_printer *p)
+{
+}
+
+#endif
+
struct intel_wakeref_auto {
struct intel_runtime_pm *rpm;
struct timer_list timer;
--
2.25.1