diff options
| -rw-r--r-- | drivers/gpu/drm/i915/i915_drv.h | 5 | ||||
| -rw-r--r-- | drivers/gpu/drm/i915/intel_runtime_pm.c | 366 | ||||
| -rw-r--r-- | drivers/gpu/drm/i915/intel_runtime_pm.h | 34 |
3 files changed, 395 insertions, 10 deletions
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h index d0257808734c..5801f5407589 100644 --- a/drivers/gpu/drm/i915/i915_drv.h +++ b/drivers/gpu/drm/i915/i915_drv.h @@ -834,6 +834,11 @@ struct i915_power_domains { struct mutex lock; int domain_use_count[POWER_DOMAIN_NUM]; + + struct delayed_work async_put_work; + intel_wakeref_t async_put_wakeref; + u64 async_put_domains[2]; + struct i915_power_well *power_wells; }; diff --git a/drivers/gpu/drm/i915/intel_runtime_pm.c b/drivers/gpu/drm/i915/intel_runtime_pm.c index 2cf4943df2e7..aa3c6f81c345 100644 --- a/drivers/gpu/drm/i915/intel_runtime_pm.c +++ b/drivers/gpu/drm/i915/intel_runtime_pm.c @@ -60,6 +60,22 @@ * present for a given platform. */ +static intel_wakeref_t intel_runtime_pm_get_raw(struct drm_i915_private *i915); +static void +__intel_runtime_pm_put(struct drm_i915_private *i915, intel_wakeref_t wref, + bool wakelock); + +#if IS_ENABLED(CONFIG_DRM_I915_DEBUG_RUNTIME_PM) +static void +intel_runtime_pm_put_raw(struct drm_i915_private *i915, intel_wakeref_t wref); +#else +static inline void intel_runtime_pm_put_raw(struct drm_i915_private *i915, + intel_wakeref_t wref) +{ + __intel_runtime_pm_put(i915, -1, false); +} +#endif + #if IS_ENABLED(CONFIG_DRM_I915_DEBUG_RUNTIME_PM) #include <linux/sort.h> @@ -1903,6 +1919,125 @@ static void chv_pipe_power_well_disable(struct drm_i915_private *dev_priv, chv_set_pipe_power_well(dev_priv, power_well, false); } +static u64 __async_put_domains_mask(struct i915_power_domains *power_domains) +{ + return power_domains->async_put_domains[0] | + power_domains->async_put_domains[1]; +} + +#if IS_ENABLED(CONFIG_DRM_I915_DEBUG_RUNTIME_PM) + +static bool +assert_async_put_domain_masks_disjoint(struct i915_power_domains *power_domains) +{ + return !WARN_ON(power_domains->async_put_domains[0] & + power_domains->async_put_domains[1]); +} + +static bool +__async_put_domains_state_ok(struct i915_power_domains *power_domains) +{ + enum intel_display_power_domain domain; + bool err = false; + + err |= !assert_async_put_domain_masks_disjoint(power_domains); + err |= WARN_ON(!!power_domains->async_put_wakeref != + !!__async_put_domains_mask(power_domains)); + + for_each_power_domain(domain, __async_put_domains_mask(power_domains)) + err |= WARN_ON(power_domains->domain_use_count[domain] != 1); + + return !err; +} + +static void print_power_domains(struct i915_power_domains *power_domains, + const char *prefix, u64 mask) +{ + enum intel_display_power_domain domain; + + DRM_DEBUG_DRIVER("%s (%lu):\n", prefix, hweight64(mask)); + for_each_power_domain(domain, mask) + DRM_DEBUG_DRIVER("%s use_count %d\n", + intel_display_power_domain_str(domain), + power_domains->domain_use_count[domain]); +} + +static void +print_async_put_domains_state(struct i915_power_domains *power_domains) +{ + DRM_DEBUG_DRIVER("async_put_wakeref %u\n", + power_domains->async_put_wakeref); + + print_power_domains(power_domains, "async_put_domains[0]", + power_domains->async_put_domains[0]); + print_power_domains(power_domains, "async_put_domains[1]", + power_domains->async_put_domains[1]); +} + +static void +verify_async_put_domains_state(struct i915_power_domains *power_domains) +{ + if (!__async_put_domains_state_ok(power_domains)) + print_async_put_domains_state(power_domains); +} + +#else + +static void +assert_async_put_domain_masks_disjoint(struct i915_power_domains *power_domains) +{ +} + +static void +verify_async_put_domains_state(struct i915_power_domains *power_domains) +{ +} + +#endif /* CONFIG_DRM_I915_DEBUG_RUNTIME_PM */ + +static u64 async_put_domains_mask(struct i915_power_domains *power_domains) +{ + assert_async_put_domain_masks_disjoint(power_domains); + + return __async_put_domains_mask(power_domains); +} + +static void +async_put_domains_clear_domain(struct i915_power_domains *power_domains, + enum intel_display_power_domain domain) +{ + assert_async_put_domain_masks_disjoint(power_domains); + + power_domains->async_put_domains[0] &= ~BIT_ULL(domain); + power_domains->async_put_domains[1] &= ~BIT_ULL(domain); +} + +static bool +intel_display_power_grab_async_put_ref(struct drm_i915_private *dev_priv, + enum intel_display_power_domain domain) +{ + struct i915_power_domains *power_domains = &dev_priv->power_domains; + bool ret = false; + + if (!(async_put_domains_mask(power_domains) & BIT_ULL(domain))) + goto out_verify; + + async_put_domains_clear_domain(power_domains, domain); + + ret = true; + + if (async_put_domains_mask(power_domains)) + goto out_verify; + + cancel_delayed_work(&power_domains->async_put_work); + intel_runtime_pm_put_raw(dev_priv, + fetch_and_zero(&power_domains->async_put_wakeref)); +out_verify: + verify_async_put_domains_state(power_domains); + + return ret; +} + static void __intel_display_power_get_domain(struct drm_i915_private *dev_priv, enum intel_display_power_domain domain) @@ -1910,6 +2045,9 @@ __intel_display_power_get_domain(struct drm_i915_private *dev_priv, struct i915_power_domains *power_domains = &dev_priv->power_domains; struct i915_power_well *power_well; + if (intel_display_power_grab_async_put_ref(dev_priv, domain)) + return; + for_each_power_domain_well(dev_priv, power_well, BIT_ULL(domain)) intel_power_well_get(dev_priv, power_well); @@ -1935,9 +2073,7 @@ intel_wakeref_t intel_display_power_get(struct drm_i915_private *dev_priv, intel_wakeref_t wakeref = intel_runtime_pm_get(dev_priv); mutex_lock(&power_domains->lock); - __intel_display_power_get_domain(dev_priv, domain); - mutex_unlock(&power_domains->lock); return wakeref; @@ -1986,24 +2122,36 @@ intel_display_power_get_if_enabled(struct drm_i915_private *dev_priv, return wakeref; } -static void __intel_display_power_put(struct drm_i915_private *dev_priv, - enum intel_display_power_domain domain) +static void +__intel_display_power_put_domain(struct drm_i915_private *dev_priv, + enum intel_display_power_domain domain) { struct i915_power_domains *power_domains; struct i915_power_well *power_well; + const char *name = intel_display_power_domain_str(domain); power_domains = &dev_priv->power_domains; - mutex_lock(&power_domains->lock); - WARN(!power_domains->domain_use_count[domain], "Use count on domain %s is already zero\n", - intel_display_power_domain_str(domain)); + name); + WARN(async_put_domains_mask(power_domains) & BIT_ULL(domain), + "Async disabling of domain %s is pending\n", + name); + power_domains->domain_use_count[domain]--; for_each_power_domain_well_reverse(dev_priv, power_well, BIT_ULL(domain)) intel_power_well_put(dev_priv, power_well); +} +static void __intel_display_power_put(struct drm_i915_private *dev_priv, + enum intel_display_power_domain domain) +{ + struct i915_power_domains *power_domains = &dev_priv->power_domains; + + mutex_lock(&power_domains->lock); + __intel_display_power_put_domain(dev_priv, domain); mutex_unlock(&power_domains->lock); } @@ -2027,6 +2175,188 @@ void intel_display_power_put_unchecked(struct drm_i915_private *dev_priv, intel_runtime_pm_put_unchecked(dev_priv); } +static void +queue_async_put_domains_work(struct i915_power_domains *power_domains, + intel_wakeref_t wakeref) +{ + WARN_ON(power_domains->async_put_wakeref); + power_domains->async_put_wakeref = wakeref; + WARN_ON(!queue_delayed_work(system_unbound_wq, + &power_domains->async_put_work, + msecs_to_jiffies(100))); +} + +static void +release_async_put_domains(struct i915_power_domains *power_domains, u64 mask) +{ + struct drm_i915_private *dev_priv = + container_of(power_domains, struct drm_i915_private, + power_domains); + enum intel_display_power_domain domain; + intel_wakeref_t wakeref; + + /* + * The caller must hold already raw wakeref, upgrade that to a proper + * wakeref to make the state checker happy about the HW access during + * power well disabling. + */ + assert_rpm_raw_wakeref_held(dev_priv); + wakeref = intel_runtime_pm_get(dev_priv); + + for_each_power_domain(domain, mask) { + /* Clear before put, so put's sanity check is happy. */ + async_put_domains_clear_domain(power_domains, domain); + __intel_display_power_put_domain(dev_priv, domain); + } + + intel_runtime_pm_put(dev_priv, wakeref); +} + +static void +intel_display_power_put_async_work(struct work_struct *work) +{ + struct drm_i915_private *dev_priv = + container_of(work, struct drm_i915_private, + power_domains.async_put_work.work); + struct i915_power_domains *power_domains = &dev_priv->power_domains; + intel_wakeref_t new_work_wakeref = intel_runtime_pm_get_raw(dev_priv); + intel_wakeref_t old_work_wakeref = 0; + + mutex_lock(&power_domains->lock); + + /* + * Bail out if all the domain refs pending to be released were grabbed + * by subsequent gets or a flush_work. + */ + old_work_wakeref = fetch_and_zero(&power_domains->async_put_wakeref); + if (!old_work_wakeref) + goto out_verify; + + release_async_put_domains(power_domains, + power_domains->async_put_domains[0]); + + /* Requeue the work if more domains were async put meanwhile. */ + if (power_domains->async_put_domains[1]) { + power_domains->async_put_domains[0] = + fetch_and_zero(&power_domains->async_put_domains[1]); + queue_async_put_domains_work(power_domains, + fetch_and_zero(&new_work_wakeref)); + } + +out_verify: + verify_async_put_domains_state(power_domains); + + mutex_unlock(&power_domains->lock); + + if (old_work_wakeref) + intel_runtime_pm_put_raw(dev_priv, old_work_wakeref); + if (new_work_wakeref) + intel_runtime_pm_put_raw(dev_priv, new_work_wakeref); +} + +/** + * intel_display_power_put_async - release a power domain reference asynchronously + * @i915: i915 device instance + * @domain: power domain to reference + * @wakeref: wakeref acquired for the reference that is being released + * + * This function drops the power domain reference obtained by + * intel_display_power_get*() and schedules a work to power down the + * corresponding hardware block if this is the last reference. + */ +void __intel_display_power_put_async(struct drm_i915_private *i915, + enum intel_display_power_domain domain, + intel_wakeref_t wakeref) +{ + struct i915_power_domains *power_domains = &i915->power_domains; + intel_wakeref_t work_wakeref = intel_runtime_pm_get_raw(i915); + + mutex_lock(&power_domains->lock); + + if (power_domains->domain_use_count[domain] > 1) { + __intel_display_power_put_domain(i915, domain); + + goto out_verify; + } + + WARN_ON(power_domains->domain_use_count[domain] != 1); + + /* Let a pending work requeue itself or queue a new one. */ + if (power_domains->async_put_wakeref) { + power_domains->async_put_domains[1] |= BIT_ULL(domain); + } else { + power_domains->async_put_domains[0] |= BIT_ULL(domain); + queue_async_put_domains_work(power_domains, + fetch_and_zero(&work_wakeref)); + } + +out_verify: + verify_async_put_domains_state(power_domains); + + mutex_unlock(&power_domains->lock); + + if (work_wakeref) + intel_runtime_pm_put_raw(i915, work_wakeref); + + intel_runtime_pm_put(i915, wakeref); +} + +/** + * intel_display_power_flush_work - flushes the async display power disabling work + * @i915: i915 device instance + * + * Flushes any pending work that was scheduled by a preceding + * intel_display_power_put_async() call, completing the disabling of the + * corresponding power domains. + * + * Note that the work handler function may still be running after this + * function returns; to ensure that the work handler isn't running use + * intel_display_power_flush_work_sync() instead. + */ +void intel_display_power_flush_work(struct drm_i915_private *i915) +{ + struct i915_power_domains *power_domains = &i915->power_domains; + intel_wakeref_t work_wakeref; + + mutex_lock(&power_domains->lock); + + work_wakeref = fetch_and_zero(&power_domains->async_put_wakeref); + if (!work_wakeref) + goto out_verify; + + release_async_put_domains(power_domains, + async_put_domains_mask(power_domains)); + cancel_delayed_work(&power_domains->async_put_work); + +out_verify: + verify_async_put_domains_state(power_domains); + + mutex_unlock(&power_domains->lock); + + if (work_wakeref) + intel_runtime_pm_put_raw(i915, work_wakeref); +} + +/** + * intel_display_power_flush_work_sync - flushes and syncs the async display power disabling work + * @i915: i915 device instance + * + * Like intel_display_power_flush_work(), but also ensure that the work + * handler function is not running any more when this function returns. + */ +static void +intel_display_power_flush_work_sync(struct drm_i915_private *i915) +{ + struct i915_power_domains *power_domains = &i915->power_domains; + + intel_display_power_flush_work(i915); + cancel_delayed_work_sync(&power_domains->async_put_work); + + verify_async_put_domains_state(power_domains); + + WARN_ON(power_domains->async_put_wakeref); +} + #if IS_ENABLED(CONFIG_DRM_I915_DEBUG_RUNTIME_PM) /** * intel_display_power_put - release a power domain reference @@ -3525,6 +3855,9 @@ int intel_power_domains_init(struct drm_i915_private *dev_priv) mutex_init(&power_domains->lock); + INIT_DELAYED_WORK(&power_domains->async_put_work, + intel_display_power_put_async_work); + /* * The enabling order will be from lower to higher indexed wells, * the disabling order is reversed. @@ -4445,6 +4778,8 @@ void intel_power_domains_fini_hw(struct drm_i915_private *i915) if (!i915_modparams.disable_power_well) intel_display_power_put_unchecked(i915, POWER_DOMAIN_INIT); + intel_display_power_flush_work_sync(i915); + intel_power_domains_verify_state(i915); /* Keep the power well enabled, but cancel its rpm wakeref. */ @@ -4520,6 +4855,7 @@ void intel_power_domains_suspend(struct drm_i915_private *i915, if (!(i915->csr.allowed_dc_mask & DC_STATE_EN_DC9) && suspend_mode == I915_DRM_SUSPEND_IDLE && i915->csr.dmc_payload) { + intel_display_power_flush_work(i915); intel_power_domains_verify_state(i915); return; } @@ -4531,6 +4867,7 @@ void intel_power_domains_suspend(struct drm_i915_private *i915, if (!i915_modparams.disable_power_well) intel_display_power_put_unchecked(i915, POWER_DOMAIN_INIT); + intel_display_power_flush_work(i915); intel_power_domains_verify_state(i915); if (INTEL_GEN(i915) >= 11) @@ -4609,6 +4946,8 @@ static void intel_power_domains_verify_state(struct drm_i915_private *i915) mutex_lock(&power_domains->lock); + verify_async_put_domains_state(power_domains); + dump_domain_info = false; for_each_power_well(i915, power_well) { enum intel_display_power_domain domain; @@ -4670,6 +5009,11 @@ static intel_wakeref_t __intel_runtime_pm_get(struct drm_i915_private *i915, return track_intel_runtime_pm_wakeref(i915); } +static intel_wakeref_t intel_runtime_pm_get_raw(struct drm_i915_private *i915) +{ + return __intel_runtime_pm_get(i915, false); +} + /** * intel_runtime_pm_get - grab a runtime pm reference * @i915: i915 device instance @@ -4769,6 +5113,14 @@ static void __intel_runtime_pm_put(struct drm_i915_private *i915, pm_runtime_put_autosuspend(kdev); } +#if IS_ENABLED(CONFIG_DRM_I915_DEBUG_RUNTIME_PM) +static void +intel_runtime_pm_put_raw(struct drm_i915_private *i915, intel_wakeref_t wref) +{ + __intel_runtime_pm_put(i915, wref, false); +} +#endif + /** * intel_runtime_pm_put_unchecked - release an unchecked runtime pm reference * @i915: i915 device instance diff --git a/drivers/gpu/drm/i915/intel_runtime_pm.h b/drivers/gpu/drm/i915/intel_runtime_pm.h index e30b38632bd2..56ad79ef0806 100644 --- a/drivers/gpu/drm/i915/intel_runtime_pm.h +++ b/drivers/gpu/drm/i915/intel_runtime_pm.h @@ -59,13 +59,37 @@ intel_display_power_get_if_enabled(struct drm_i915_private *dev_priv, enum intel_display_power_domain domain); void intel_display_power_put_unchecked(struct drm_i915_private *dev_priv, enum intel_display_power_domain domain); +void __intel_display_power_put_async(struct drm_i915_private *i915, + enum intel_display_power_domain domain, + intel_wakeref_t wakeref); +void intel_display_power_flush_work(struct drm_i915_private *i915); #if IS_ENABLED(CONFIG_DRM_I915_DEBUG_RUNTIME_PM) void intel_display_power_put(struct drm_i915_private *dev_priv, enum intel_display_power_domain domain, intel_wakeref_t wakeref); +static inline void +intel_display_power_put_async(struct drm_i915_private *i915, + enum intel_display_power_domain domain, + intel_wakeref_t wakeref) +{ + __intel_display_power_put_async(i915, domain, wakeref); +} #else -#define intel_display_power_put(i915, domain, wakeref) \ - intel_display_power_put_unchecked(i915, domain) +static inline void +intel_display_power_put(struct drm_i915_private *i915, + enum intel_display_power_domain domain, + intel_wakeref_t wakeref) +{ + intel_display_power_put_unchecked(i915, domain); +} + +static inline void +intel_display_power_put_async(struct drm_i915_private *i915, + enum intel_display_power_domain domain, + intel_wakeref_t wakeref) +{ + __intel_display_power_put_async(i915, domain, -1); +} #endif void icl_dbuf_slices_update(struct drm_i915_private *dev_priv, u8 req_slices); @@ -86,7 +110,11 @@ void intel_runtime_pm_put_unchecked(struct drm_i915_private *i915); #if IS_ENABLED(CONFIG_DRM_I915_DEBUG_RUNTIME_PM) void intel_runtime_pm_put(struct drm_i915_private *i915, intel_wakeref_t wref); #else -#define intel_runtime_pm_put(i915, wref) intel_runtime_pm_put_unchecked(i915) +static inline void +intel_runtime_pm_put(struct drm_i915_private *i915, intel_wakeref_t wref) +{ + intel_runtime_pm_put_unchecked(i915); +} #endif #if IS_ENABLED(CONFIG_DRM_I915_DEBUG_RUNTIME_PM) |