diff options
Diffstat (limited to 'drivers/gpu/drm/i915/intel_wakeref.h')
| -rw-r--r-- | drivers/gpu/drm/i915/intel_wakeref.h | 123 |
1 files changed, 98 insertions, 25 deletions
diff --git a/drivers/gpu/drm/i915/intel_wakeref.h b/drivers/gpu/drm/i915/intel_wakeref.h index 545c8f277c46..a2894a56e18f 100644 --- a/drivers/gpu/drm/i915/intel_wakeref.h +++ b/drivers/gpu/drm/i915/intel_wakeref.h @@ -13,21 +13,25 @@ #include <linux/lockdep.h> #include <linux/mutex.h> #include <linux/refcount.h> -#include <linux/stackdepot.h> +#include <linux/ref_tracker.h> #include <linux/timer.h> #include <linux/workqueue.h> +struct drm_printer; +struct intel_runtime_pm; +struct intel_wakeref; + +typedef struct ref_tracker *intel_wakeref_t; + +#define INTEL_REFTRACK_DEAD_COUNT 16 +#define INTEL_REFTRACK_PRINT_LIMIT 16 + #if IS_ENABLED(CONFIG_DRM_I915_DEBUG) #define INTEL_WAKEREF_BUG_ON(expr) BUG_ON(expr) #else #define INTEL_WAKEREF_BUG_ON(expr) BUILD_BUG_ON_INVALID(expr) #endif -struct intel_runtime_pm; -struct intel_wakeref; - -typedef depot_stack_handle_t intel_wakeref_t; - struct intel_wakeref_ops { int (*get)(struct intel_wakeref *wf); int (*put)(struct intel_wakeref *wf); @@ -39,10 +43,14 @@ struct intel_wakeref { intel_wakeref_t wakeref; - struct intel_runtime_pm *rpm; + struct drm_i915_private *i915; const struct intel_wakeref_ops *ops; struct delayed_work work; + +#if IS_ENABLED(CONFIG_DRM_I915_DEBUG_WAKEREF) + struct ref_tracker_dir debug; +#endif }; struct intel_wakeref_lockclass { @@ -51,13 +59,14 @@ struct intel_wakeref_lockclass { }; void __intel_wakeref_init(struct intel_wakeref *wf, - struct intel_runtime_pm *rpm, + struct drm_i915_private *i915, const struct intel_wakeref_ops *ops, - struct intel_wakeref_lockclass *key); -#define intel_wakeref_init(wf, rpm, ops) do { \ + struct intel_wakeref_lockclass *key, + const char *name); +#define intel_wakeref_init(wf, i915, ops, name) do { \ static struct intel_wakeref_lockclass __key; \ \ - __intel_wakeref_init((wf), (rpm), (ops), &__key); \ + __intel_wakeref_init((wf), (i915), (ops), &__key, name); \ } while (0) int __intel_wakeref_get_first(struct intel_wakeref *wf); @@ -68,11 +77,12 @@ void __intel_wakeref_put_last(struct intel_wakeref *wf, unsigned long flags); * @wf: the wakeref * * Acquire a hold on the wakeref. The first user to do so, will acquire - * the runtime pm wakeref and then call the @fn underneath the wakeref - * mutex. + * the runtime pm wakeref and then call the intel_wakeref_ops->get() + * underneath the wakeref mutex. * - * Note that @fn is allowed to fail, in which case the runtime-pm wakeref - * will be released and the acquisition unwound, and an error reported. + * Note that intel_wakeref_ops->get() is allowed to fail, in which case + * the runtime-pm wakeref will be released and the acquisition unwound, + * and an error reported. * * Returns: 0 if the wakeref was acquired successfully, or a negative error * code otherwise. @@ -104,7 +114,7 @@ __intel_wakeref_get(struct intel_wakeref *wf) } /** - * intel_wakeref_get_if_in_use: Acquire the wakeref + * intel_wakeref_get_if_active: Acquire the wakeref * @wf: the wakeref * * Acquire a hold on the wakeref, but only if the wakeref is already @@ -123,20 +133,24 @@ enum { __INTEL_WAKEREF_PUT_LAST_BIT__ }; +static inline void +intel_wakeref_might_get(struct intel_wakeref *wf) +{ + might_lock(&wf->mutex); +} + /** - * intel_wakeref_put_flags: Release the wakeref + * __intel_wakeref_put: Release the wakeref * @wf: the wakeref * @flags: control flags * * Release our hold on the wakeref. When there are no more users, - * the runtime pm wakeref will be released after the @fn callback is called - * underneath the wakeref mutex. + * the runtime pm wakeref will be released after the intel_wakeref_ops->put() + * callback is called underneath the wakeref mutex. * - * Note that @fn is allowed to fail, in which case the runtime-pm wakeref - * is retained and an error reported. + * Note that intel_wakeref_ops->put() is allowed to fail, in which case the + * runtime-pm wakeref is retained. * - * Returns: 0 if the wakeref was released successfully, or a negative error - * code otherwise. */ static inline void __intel_wakeref_put(struct intel_wakeref *wf, unsigned long flags) @@ -170,6 +184,12 @@ intel_wakeref_put_delay(struct intel_wakeref *wf, unsigned long delay) FIELD_PREP(INTEL_WAKEREF_PUT_DELAY, delay)); } +static inline void +intel_wakeref_might_put(struct intel_wakeref *wf) +{ + might_lock(&wf->mutex); +} + /** * intel_wakeref_lock: Lock the wakeref (mutex) * @wf: the wakeref @@ -250,8 +270,61 @@ __intel_wakeref_defer_park(struct intel_wakeref *wf) */ int intel_wakeref_wait_for_idle(struct intel_wakeref *wf); +#define INTEL_WAKEREF_DEF ERR_PTR(-ENOENT) + +static inline intel_wakeref_t intel_ref_tracker_alloc(struct ref_tracker_dir *dir) +{ + struct ref_tracker *user = NULL; + + ref_tracker_alloc(dir, &user, GFP_NOWAIT); + + return user ?: INTEL_WAKEREF_DEF; +} + +static inline void intel_ref_tracker_free(struct ref_tracker_dir *dir, + intel_wakeref_t wakeref) +{ + if (wakeref == INTEL_WAKEREF_DEF) + wakeref = NULL; + + if (WARN_ON(IS_ERR(wakeref))) + return; + + ref_tracker_free(dir, &wakeref); +} + +void intel_ref_tracker_show(struct ref_tracker_dir *dir, + struct drm_printer *p); + +#if IS_ENABLED(CONFIG_DRM_I915_DEBUG_WAKEREF) + +static inline intel_wakeref_t intel_wakeref_track(struct intel_wakeref *wf) +{ + return intel_ref_tracker_alloc(&wf->debug); +} + +static inline void intel_wakeref_untrack(struct intel_wakeref *wf, + intel_wakeref_t handle) +{ + intel_ref_tracker_free(&wf->debug, handle); +} + +#else + +static inline intel_wakeref_t intel_wakeref_track(struct intel_wakeref *wf) +{ + return INTEL_WAKEREF_DEF; +} + +static inline void intel_wakeref_untrack(struct intel_wakeref *wf, + intel_wakeref_t handle) +{ +} + +#endif + struct intel_wakeref_auto { - struct intel_runtime_pm *rpm; + struct drm_i915_private *i915; struct timer_list timer; intel_wakeref_t wakeref; spinlock_t lock; @@ -276,7 +349,7 @@ struct intel_wakeref_auto { void intel_wakeref_auto(struct intel_wakeref_auto *wf, unsigned long timeout); void intel_wakeref_auto_init(struct intel_wakeref_auto *wf, - struct intel_runtime_pm *rpm); + struct drm_i915_private *i915); void intel_wakeref_auto_fini(struct intel_wakeref_auto *wf); #endif /* INTEL_WAKEREF_H */ |