[Intel-gfx] [PATCH 19/23] drm/i915: Track the wakeref used to initialise display power domains
Chris Wilson
chris at chris-wilson.co.uk
Thu Aug 16 21:07:38 UTC 2018
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 at chris-wilson.co.uk>
---
drivers/gpu/drm/i915/i915_debugfs.c | 3 +
drivers/gpu/drm/i915/i915_drv.h | 2 +
drivers/gpu/drm/i915/intel_runtime_pm.c | 133 +++++++++++++-----------
3 files changed, 79 insertions(+), 59 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index 3a9b77ae37f4..74183340f97c 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -2690,6 +2690,9 @@ 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 management: %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 712cb1e80e59..f8bd165c1f03 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -943,6 +943,8 @@ 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 7dffe8aca7a6..99e88a4ab49d 100644
--- a/drivers/gpu/drm/i915/intel_runtime_pm.c
+++ b/drivers/gpu/drm/i915/intel_runtime_pm.c
@@ -3973,7 +3973,7 @@ static void vlv_cmnlane_wa(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
@@ -3986,27 +3986,27 @@ static void vlv_cmnlane_wa(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);
}
@@ -4016,17 +4016,19 @@ 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.
@@ -4035,19 +4037,22 @@ 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);
+
+ /* 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
@@ -4057,26 +4062,33 @@ 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_display_power_put(i915, POWER_DOMAIN_INIT, wakeref);
}
/**
* 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;
+
+ WARN_ON(power_domains->wakeref);
+ power_domains->wakeref =
+ intel_display_power_get(i915, POWER_DOMAIN_INIT);
}
/**
* 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
@@ -4085,12 +4097,14 @@ 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 firmware assisted context save/restore don't manually
@@ -4099,8 +4113,8 @@ void intel_power_domains_suspend(struct drm_i915_private *dev_priv,
* also enable deeper system power states that would be blocked if the
* firmware was inactive.
*/
- if (!IS_GEN9_LP(dev_priv) && suspend_mode == I915_DRM_SUSPEND_IDLE &&
- dev_priv->csr.dmc_payload != NULL)
+ if (!IS_GEN9_LP(i915) && suspend_mode == I915_DRM_SUSPEND_IDLE &&
+ i915->csr.dmc_payload != NULL)
return;
/*
@@ -4108,23 +4122,23 @@ 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_display_power_put_unchecked(i915, POWER_DOMAIN_INIT);
- 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.
*
@@ -4132,26 +4146,28 @@ 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;
return;
}
- 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);
}
-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",
@@ -4166,7 +4182,7 @@ 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
@@ -4174,16 +4190,16 @@ 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.
*/
-void intel_power_domains_verify_state(struct drm_i915_private *dev_priv)
+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;
@@ -4196,8 +4212,7 @@ void intel_power_domains_verify_state(struct drm_i915_private *dev_priv)
if (!power_well->desc->domains)
continue;
- 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)",
@@ -4221,7 +4236,7 @@ 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;
}
}
--
2.18.0
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