diff options
author | Chris Wilson <chris@chris-wilson.co.uk> | 2019-01-14 14:21:25 +0000 |
---|---|---|
committer | Chris Wilson <chris@chris-wilson.co.uk> | 2019-01-14 16:18:38 +0000 |
commit | 25c896bdb8dc8b90e8f4d477185780596fe42bbe (patch) | |
tree | 73618defbad16d50394e02d0faa269d7473a6631 | |
parent | 0e6e0be4c952372cc4c3f30bb8ddf9451f314503 (diff) | |
download | linux-25c896bdb8dc8b90e8f4d477185780596fe42bbe.tar.bz2 |
drm/i915: Track the wakeref used to initialise display power domains
On module load and unload, we grab the POWER_DOMAIN_INIT powerwells and
transfer them to the runtime-pm code. We can use our wakeref tracking to
verify that the wakeref is indeed passed from init to enable, and
disable to fini; and across suspend.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190114142129.24398-17-chris@chris-wilson.co.uk
-rw-r--r-- | drivers/gpu/drm/i915/i915_debugfs.c | 3 | ||||
-rw-r--r-- | drivers/gpu/drm/i915/i915_drv.h | 2 | ||||
-rw-r--r-- | drivers/gpu/drm/i915/intel_runtime_pm.c | 151 |
3 files changed, 88 insertions, 68 deletions
diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c index e846608ee6aa..926acd5b6e5d 100644 --- a/drivers/gpu/drm/i915/i915_debugfs.c +++ b/drivers/gpu/drm/i915/i915_debugfs.c @@ -2699,6 +2699,9 @@ static int i915_runtime_pm_status(struct seq_file *m, void *unused) if (!HAS_RUNTIME_PM(dev_priv)) seq_puts(m, "Runtime power management not supported\n"); + seq_printf(m, "Runtime power status: %s\n", + enableddisabled(!dev_priv->power_domains.wakeref)); + seq_printf(m, "GPU idle: %s (epoch %u)\n", yesno(!dev_priv->gt.awake), dev_priv->gt.epoch); seq_printf(m, "IRQs disabled: %s\n", diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h index 0aedbb88eb5b..97200411dfad 100644 --- a/drivers/gpu/drm/i915/i915_drv.h +++ b/drivers/gpu/drm/i915/i915_drv.h @@ -822,6 +822,8 @@ struct i915_power_domains { bool display_core_suspended; int power_well_count; + intel_wakeref_t wakeref; + struct mutex lock; int domain_use_count[POWER_DOMAIN_NUM]; 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 6aeceab37000..79f00610860b 100644 --- a/drivers/gpu/drm/i915/intel_runtime_pm.c +++ b/drivers/gpu/drm/i915/intel_runtime_pm.c @@ -3997,7 +3997,7 @@ static void intel_power_domains_verify_state(struct drm_i915_private *dev_priv); /** * intel_power_domains_init_hw - initialize hardware power domain state - * @dev_priv: i915 device instance + * @i915: i915 device instance * @resume: Called from resume code paths or not * * This function initializes the hardware power domain state and enables all @@ -4011,30 +4011,31 @@ static void intel_power_domains_verify_state(struct drm_i915_private *dev_priv); * intel_power_domains_enable()) and must be paired with * intel_power_domains_fini_hw(). */ -void intel_power_domains_init_hw(struct drm_i915_private *dev_priv, bool resume) +void intel_power_domains_init_hw(struct drm_i915_private *i915, bool resume) { - struct i915_power_domains *power_domains = &dev_priv->power_domains; + struct i915_power_domains *power_domains = &i915->power_domains; power_domains->initializing = true; - if (IS_ICELAKE(dev_priv)) { - icl_display_core_init(dev_priv, resume); - } else if (IS_CANNONLAKE(dev_priv)) { - cnl_display_core_init(dev_priv, resume); - } else if (IS_GEN9_BC(dev_priv)) { - skl_display_core_init(dev_priv, resume); - } else if (IS_GEN9_LP(dev_priv)) { - bxt_display_core_init(dev_priv, resume); - } else if (IS_CHERRYVIEW(dev_priv)) { + if (IS_ICELAKE(i915)) { + icl_display_core_init(i915, resume); + } else if (IS_CANNONLAKE(i915)) { + cnl_display_core_init(i915, resume); + } else if (IS_GEN9_BC(i915)) { + skl_display_core_init(i915, resume); + } else if (IS_GEN9_LP(i915)) { + bxt_display_core_init(i915, resume); + } else if (IS_CHERRYVIEW(i915)) { mutex_lock(&power_domains->lock); - chv_phy_control_init(dev_priv); + chv_phy_control_init(i915); mutex_unlock(&power_domains->lock); - } else if (IS_VALLEYVIEW(dev_priv)) { + } else if (IS_VALLEYVIEW(i915)) { mutex_lock(&power_domains->lock); - vlv_cmnlane_wa(dev_priv); + vlv_cmnlane_wa(i915); mutex_unlock(&power_domains->lock); - } else if (IS_IVYBRIDGE(dev_priv) || INTEL_GEN(dev_priv) >= 7) - intel_pch_reset_handshake(dev_priv, !HAS_PCH_NOP(dev_priv)); + } else if (IS_IVYBRIDGE(i915) || INTEL_GEN(i915) >= 7) { + intel_pch_reset_handshake(i915, !HAS_PCH_NOP(i915)); + } /* * Keep all power wells enabled for any dependent HW access during @@ -4042,18 +4043,20 @@ void intel_power_domains_init_hw(struct drm_i915_private *dev_priv, bool resume) * resources powered until display HW readout is complete. We drop * this reference in intel_power_domains_enable(). */ - intel_display_power_get(dev_priv, POWER_DOMAIN_INIT); + power_domains->wakeref = + intel_display_power_get(i915, POWER_DOMAIN_INIT); + /* Disable power support if the user asked so. */ if (!i915_modparams.disable_power_well) - intel_display_power_get(dev_priv, POWER_DOMAIN_INIT); - intel_power_domains_sync_hw(dev_priv); + intel_display_power_get(i915, POWER_DOMAIN_INIT); + intel_power_domains_sync_hw(i915); power_domains->initializing = false; } /** * intel_power_domains_fini_hw - deinitialize hw power domain state - * @dev_priv: i915 device instance + * @i915: i915 device instance * * De-initializes the display power domain HW state. It also ensures that the * device stays powered up so that the driver can be reloaded. @@ -4062,21 +4065,24 @@ void intel_power_domains_init_hw(struct drm_i915_private *dev_priv, bool resume) * intel_power_domains_disable()) and must be paired with * intel_power_domains_init_hw(). */ -void intel_power_domains_fini_hw(struct drm_i915_private *dev_priv) +void intel_power_domains_fini_hw(struct drm_i915_private *i915) { - /* Keep the power well enabled, but cancel its rpm wakeref. */ - intel_runtime_pm_put_unchecked(dev_priv); + intel_wakeref_t wakeref __maybe_unused = + fetch_and_zero(&i915->power_domains.wakeref); /* Remove the refcount we took to keep power well support disabled. */ if (!i915_modparams.disable_power_well) - intel_display_power_put_unchecked(dev_priv, POWER_DOMAIN_INIT); + intel_display_power_put_unchecked(i915, POWER_DOMAIN_INIT); + + intel_power_domains_verify_state(i915); - intel_power_domains_verify_state(dev_priv); + /* Keep the power well enabled, but cancel its rpm wakeref. */ + intel_runtime_pm_put(i915, wakeref); } /** * intel_power_domains_enable - enable toggling of display power wells - * @dev_priv: i915 device instance + * @i915: i915 device instance * * Enable the ondemand enabling/disabling of the display power wells. Note that * power wells not belonging to POWER_DOMAIN_INIT are allowed to be toggled @@ -4086,30 +4092,36 @@ void intel_power_domains_fini_hw(struct drm_i915_private *dev_priv) * of display HW readout (which will acquire the power references reflecting * the current HW state). */ -void intel_power_domains_enable(struct drm_i915_private *dev_priv) +void intel_power_domains_enable(struct drm_i915_private *i915) { - intel_display_power_put_unchecked(dev_priv, POWER_DOMAIN_INIT); + intel_wakeref_t wakeref __maybe_unused = + fetch_and_zero(&i915->power_domains.wakeref); - intel_power_domains_verify_state(dev_priv); + intel_display_power_put(i915, POWER_DOMAIN_INIT, wakeref); + intel_power_domains_verify_state(i915); } /** * intel_power_domains_disable - disable toggling of display power wells - * @dev_priv: i915 device instance + * @i915: i915 device instance * * Disable the ondemand enabling/disabling of the display power wells. See * intel_power_domains_enable() for which power wells this call controls. */ -void intel_power_domains_disable(struct drm_i915_private *dev_priv) +void intel_power_domains_disable(struct drm_i915_private *i915) { - intel_display_power_get(dev_priv, POWER_DOMAIN_INIT); + struct i915_power_domains *power_domains = &i915->power_domains; - intel_power_domains_verify_state(dev_priv); + WARN_ON(power_domains->wakeref); + power_domains->wakeref = + intel_display_power_get(i915, POWER_DOMAIN_INIT); + + intel_power_domains_verify_state(i915); } /** * intel_power_domains_suspend - suspend power domain state - * @dev_priv: i915 device instance + * @i915: i915 device instance * @suspend_mode: specifies the target suspend state (idle, mem, hibernation) * * This function prepares the hardware power domain state before entering @@ -4118,12 +4130,14 @@ void intel_power_domains_disable(struct drm_i915_private *dev_priv) * It must be called with power domains already disabled (after a call to * intel_power_domains_disable()) and paired with intel_power_domains_resume(). */ -void intel_power_domains_suspend(struct drm_i915_private *dev_priv, +void intel_power_domains_suspend(struct drm_i915_private *i915, enum i915_drm_suspend_mode suspend_mode) { - struct i915_power_domains *power_domains = &dev_priv->power_domains; + struct i915_power_domains *power_domains = &i915->power_domains; + intel_wakeref_t wakeref __maybe_unused = + fetch_and_zero(&power_domains->wakeref); - intel_display_power_put_unchecked(dev_priv, POWER_DOMAIN_INIT); + intel_display_power_put(i915, POWER_DOMAIN_INIT, wakeref); /* * In case of suspend-to-idle (aka S0ix) on a DMC platform without DC9 @@ -4132,10 +4146,10 @@ void intel_power_domains_suspend(struct drm_i915_private *dev_priv, * resources as required and also enable deeper system power states * that would be blocked if the firmware was inactive. */ - if (!(dev_priv->csr.allowed_dc_mask & DC_STATE_EN_DC9) && + if (!(i915->csr.allowed_dc_mask & DC_STATE_EN_DC9) && suspend_mode == I915_DRM_SUSPEND_IDLE && - dev_priv->csr.dmc_payload != NULL) { - intel_power_domains_verify_state(dev_priv); + i915->csr.dmc_payload) { + intel_power_domains_verify_state(i915); return; } @@ -4144,25 +4158,25 @@ void intel_power_domains_suspend(struct drm_i915_private *dev_priv, * power wells if power domains must be deinitialized for suspend. */ if (!i915_modparams.disable_power_well) { - intel_display_power_put_unchecked(dev_priv, POWER_DOMAIN_INIT); - intel_power_domains_verify_state(dev_priv); + intel_display_power_put_unchecked(i915, POWER_DOMAIN_INIT); + intel_power_domains_verify_state(i915); } - if (IS_ICELAKE(dev_priv)) - icl_display_core_uninit(dev_priv); - else if (IS_CANNONLAKE(dev_priv)) - cnl_display_core_uninit(dev_priv); - else if (IS_GEN9_BC(dev_priv)) - skl_display_core_uninit(dev_priv); - else if (IS_GEN9_LP(dev_priv)) - bxt_display_core_uninit(dev_priv); + if (IS_ICELAKE(i915)) + icl_display_core_uninit(i915); + else if (IS_CANNONLAKE(i915)) + cnl_display_core_uninit(i915); + else if (IS_GEN9_BC(i915)) + skl_display_core_uninit(i915); + else if (IS_GEN9_LP(i915)) + bxt_display_core_uninit(i915); power_domains->display_core_suspended = true; } /** * intel_power_domains_resume - resume power domain state - * @dev_priv: i915 device instance + * @i915: i915 device instance * * This function resume the hardware power domain state during system resume. * @@ -4170,28 +4184,30 @@ void intel_power_domains_suspend(struct drm_i915_private *dev_priv, * intel_power_domains_enable()) and must be paired with * intel_power_domains_suspend(). */ -void intel_power_domains_resume(struct drm_i915_private *dev_priv) +void intel_power_domains_resume(struct drm_i915_private *i915) { - struct i915_power_domains *power_domains = &dev_priv->power_domains; + struct i915_power_domains *power_domains = &i915->power_domains; if (power_domains->display_core_suspended) { - intel_power_domains_init_hw(dev_priv, true); + intel_power_domains_init_hw(i915, true); power_domains->display_core_suspended = false; } else { - intel_display_power_get(dev_priv, POWER_DOMAIN_INIT); + WARN_ON(power_domains->wakeref); + power_domains->wakeref = + intel_display_power_get(i915, POWER_DOMAIN_INIT); } - intel_power_domains_verify_state(dev_priv); + intel_power_domains_verify_state(i915); } #if IS_ENABLED(CONFIG_DRM_I915_DEBUG_RUNTIME_PM) -static void intel_power_domains_dump_info(struct drm_i915_private *dev_priv) +static void intel_power_domains_dump_info(struct drm_i915_private *i915) { - struct i915_power_domains *power_domains = &dev_priv->power_domains; + struct i915_power_domains *power_domains = &i915->power_domains; struct i915_power_well *power_well; - for_each_power_well(dev_priv, power_well) { + for_each_power_well(i915, power_well) { enum intel_display_power_domain domain; DRM_DEBUG_DRIVER("%-25s %d\n", @@ -4206,7 +4222,7 @@ static void intel_power_domains_dump_info(struct drm_i915_private *dev_priv) /** * intel_power_domains_verify_state - verify the HW/SW state for all power wells - * @dev_priv: i915 device instance + * @i915: i915 device instance * * Verify if the reference count of each power well matches its HW enabled * state and the total refcount of the domains it belongs to. This must be @@ -4214,22 +4230,21 @@ static void intel_power_domains_dump_info(struct drm_i915_private *dev_priv) * acquiring reference counts for any power wells in use and disabling the * ones left on by BIOS but not required by any active output. */ -static void intel_power_domains_verify_state(struct drm_i915_private *dev_priv) +static void intel_power_domains_verify_state(struct drm_i915_private *i915) { - struct i915_power_domains *power_domains = &dev_priv->power_domains; + struct i915_power_domains *power_domains = &i915->power_domains; struct i915_power_well *power_well; bool dump_domain_info; mutex_lock(&power_domains->lock); dump_domain_info = false; - for_each_power_well(dev_priv, power_well) { + for_each_power_well(i915, power_well) { enum intel_display_power_domain domain; int domains_count; bool enabled; - enabled = power_well->desc->ops->is_enabled(dev_priv, - power_well); + enabled = power_well->desc->ops->is_enabled(i915, power_well); if ((power_well->count || power_well->desc->always_on) != enabled) DRM_ERROR("power well %s state mismatch (refcount %d/enabled %d)", @@ -4253,7 +4268,7 @@ static void intel_power_domains_verify_state(struct drm_i915_private *dev_priv) static bool dumped; if (!dumped) { - intel_power_domains_dump_info(dev_priv); + intel_power_domains_dump_info(i915); dumped = true; } } @@ -4263,7 +4278,7 @@ static void intel_power_domains_verify_state(struct drm_i915_private *dev_priv) #else -static void intel_power_domains_verify_state(struct drm_i915_private *dev_priv) +static void intel_power_domains_verify_state(struct drm_i915_private *i915) { } |