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drm/i915: Mark up sysfs with rpm wakeref tracking

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As sysfs has a simple pattern of taking a rpm wakeref around the user
access, we can track the local reference and drop it as soon as
possible.

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/20190114142129.24398-5-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson 2019-01-14 14:21:13 +00:00
parent 183e260ba2
commit 48d1c81216
1 changed files with 14 additions and 10 deletions
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24
drivers/gpu/drm/i915/i915_sysfs.c
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@ -42,11 +42,12 @@ static inline struct drm_i915_private *kdev_minor_to_i915(struct device *kdev)
static u32 calc_residency(struct drm_i915_private *dev_priv,
i915_reg_t reg)
{
intel_wakeref_t wakeref;
u64 res;
intel_runtime_pm_get(dev_priv);
wakeref = intel_runtime_pm_get(dev_priv);
res = intel_rc6_residency_us(dev_priv, reg);
intel_runtime_pm_put_unchecked(dev_priv);
intel_runtime_pm_put(dev_priv, wakeref);
return DIV_ROUND_CLOSEST_ULL(res, 1000);
}
@ -258,9 +259,10 @@ static ssize_t gt_act_freq_mhz_show(struct device *kdev,
struct device_attribute *attr, char *buf)
{
struct drm_i915_private *dev_priv = kdev_minor_to_i915(kdev);
intel_wakeref_t wakeref;
int ret;
intel_runtime_pm_get(dev_priv);
wakeref = intel_runtime_pm_get(dev_priv);
mutex_lock(&dev_priv->pcu_lock);
if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv)) {
@ -274,7 +276,7 @@ static ssize_t gt_act_freq_mhz_show(struct device *kdev,
}
mutex_unlock(&dev_priv->pcu_lock);
intel_runtime_pm_put_unchecked(dev_priv);
intel_runtime_pm_put(dev_priv, wakeref);
return snprintf(buf, PAGE_SIZE, "%d\n", ret);
}
@ -354,6 +356,7 @@ static ssize_t gt_max_freq_mhz_store(struct device *kdev,
{
struct drm_i915_private *dev_priv = kdev_minor_to_i915(kdev);
struct intel_rps *rps = &dev_priv->gt_pm.rps;
intel_wakeref_t wakeref;
u32 val;
ssize_t ret;
@ -361,7 +364,7 @@ static ssize_t gt_max_freq_mhz_store(struct device *kdev,
if (ret)
return ret;
intel_runtime_pm_get(dev_priv);
wakeref = intel_runtime_pm_get(dev_priv);
mutex_lock(&dev_priv->pcu_lock);
@ -371,7 +374,7 @@ static ssize_t gt_max_freq_mhz_store(struct device *kdev,
val > rps->max_freq ||
val < rps->min_freq_softlimit) {
mutex_unlock(&dev_priv->pcu_lock);
intel_runtime_pm_put_unchecked(dev_priv);
intel_runtime_pm_put(dev_priv, wakeref);
return -EINVAL;
}
@ -392,7 +395,7 @@ static ssize_t gt_max_freq_mhz_store(struct device *kdev,
mutex_unlock(&dev_priv->pcu_lock);
intel_runtime_pm_put_unchecked(dev_priv);
intel_runtime_pm_put(dev_priv, wakeref);
return ret ?: count;
}
@ -412,6 +415,7 @@ static ssize_t gt_min_freq_mhz_store(struct device *kdev,
{
struct drm_i915_private *dev_priv = kdev_minor_to_i915(kdev);
struct intel_rps *rps = &dev_priv->gt_pm.rps;
intel_wakeref_t wakeref;
u32 val;
ssize_t ret;
@ -419,7 +423,7 @@ static ssize_t gt_min_freq_mhz_store(struct device *kdev,
if (ret)
return ret;
intel_runtime_pm_get(dev_priv);
wakeref = intel_runtime_pm_get(dev_priv);
mutex_lock(&dev_priv->pcu_lock);
@ -429,7 +433,7 @@ static ssize_t gt_min_freq_mhz_store(struct device *kdev,
val > rps->max_freq ||
val > rps->max_freq_softlimit) {
mutex_unlock(&dev_priv->pcu_lock);
intel_runtime_pm_put_unchecked(dev_priv);
intel_runtime_pm_put(dev_priv, wakeref);
return -EINVAL;
}
@ -446,7 +450,7 @@ static ssize_t gt_min_freq_mhz_store(struct device *kdev,
mutex_unlock(&dev_priv->pcu_lock);
intel_runtime_pm_put_unchecked(dev_priv);
intel_runtime_pm_put(dev_priv, wakeref);
return ret ?: count;
}