drm/i915/fb: Track rpm wakerefs

Keep track of the rpm wakeref used for framebuffer access so that we can
cancel upon release and so more clearly identify leaks.

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/20190114142129.24398-11-chris@chris-wilson.co.uk

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index a980d5d..b0b8f9f 100644 (file)
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -2023,6 +2023,7 @@ intel_pin_and_fence_fb_obj(struct drm_framebuffer *fb,
        struct drm_device *dev = fb->dev;
        struct drm_i915_private *dev_priv = to_i915(dev);
        struct drm_i915_gem_object *obj = intel_fb_obj(fb);
+       intel_wakeref_t wakeref;
        struct i915_vma *vma;
        unsigned int pinctl;
        u32 alignment;
@@ -2046,7 +2047,7 @@ intel_pin_and_fence_fb_obj(struct drm_framebuffer *fb,
         * intel_runtime_pm_put(), so it is correct to wrap only the
         * pin/unpin/fence and not more.
         */
-       intel_runtime_pm_get(dev_priv);
+       wakeref = intel_runtime_pm_get(dev_priv);
 
        atomic_inc(&dev_priv->gpu_error.pending_fb_pin);
 
@@ -2101,7 +2102,7 @@ intel_pin_and_fence_fb_obj(struct drm_framebuffer *fb,
 err:
        atomic_dec(&dev_priv->gpu_error.pending_fb_pin);
 
-       intel_runtime_pm_put_unchecked(dev_priv);
+       intel_runtime_pm_put(dev_priv, wakeref);
        return vma;
 }
 

diff --git a/drivers/gpu/drm/i915/intel_fbdev.c b/drivers/gpu/drm/i915/intel_fbdev.c
index 215e589..3036d83 100644 (file)
--- a/drivers/gpu/drm/i915/intel_fbdev.c
+++ b/drivers/gpu/drm/i915/intel_fbdev.c
@@ -177,8 +177,9 @@ static int intelfb_create(struct drm_fb_helper *helper,
        const struct i915_ggtt_view view = {
                .type = I915_GGTT_VIEW_NORMAL,
        };
-       struct fb_info *info;
        struct drm_framebuffer *fb;
+       intel_wakeref_t wakeref;
+       struct fb_info *info;
        struct i915_vma *vma;
        unsigned long flags = 0;
        bool prealloc = false;
@@ -209,7 +210,7 @@ static int intelfb_create(struct drm_fb_helper *helper,
        }
 
        mutex_lock(&dev->struct_mutex);
-       intel_runtime_pm_get(dev_priv);
+       wakeref = intel_runtime_pm_get(dev_priv);
 
        /* Pin the GGTT vma for our access via info->screen_base.
         * This also validates that any existing fb inherited from the
@@ -276,7 +277,7 @@ static int intelfb_create(struct drm_fb_helper *helper,
        ifbdev->vma = vma;
        ifbdev->vma_flags = flags;
 
-       intel_runtime_pm_put_unchecked(dev_priv);
+       intel_runtime_pm_put(dev_priv, wakeref);
        mutex_unlock(&dev->struct_mutex);
        vga_switcheroo_client_fb_set(pdev, info);
        return 0;
@@ -284,7 +285,7 @@ static int intelfb_create(struct drm_fb_helper *helper,
 out_unpin:
        intel_unpin_fb_vma(vma, flags);
 out_unlock:
-       intel_runtime_pm_put_unchecked(dev_priv);
+       intel_runtime_pm_put(dev_priv, wakeref);
        mutex_unlock(&dev->struct_mutex);
        return ret;
 }