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drm/i915: Take rpm wakelock around debugfs/i915_gpu_info

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Capturing GPU state requires the device to be awake in order to read
registers. Normally, this is taken along the error handler, but for the
direct debugfs access, we cannot make assumptions about the current
device state and so either need to wake it up, or abort.

Fixes: 5a4c6f1b1b ("drm/i915: The return of i915_gpu_info to debugfs")
Testcase: igt/pm_rpm/debugfs-read
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170328131407.14863-1-chris@chris-wilson.co.uk
Reviewed-by: Mika Kuoppala <mika.kuoppala@intel.com>
This commit is contained in:
Chris Wilson 2017-03-28 14:14:07 +01:00
parent f5073824ef
commit 090e5fe3f0
1 changed files with 4 additions and 1 deletions
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5
drivers/gpu/drm/i915/i915_debugfs.c
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@ -1012,9 +1012,12 @@ static int gpu_state_release(struct inode *inode, struct file *file)
static int i915_gpu_info_open(struct inode *inode, struct file *file)
{
struct drm_i915_private *i915 = inode->i_private;
struct i915_gpu_state *gpu;
gpu = i915_capture_gpu_state(inode->i_private);
intel_runtime_pm_get(i915);
gpu = i915_capture_gpu_state(i915);
intel_runtime_pm_put(i915);
if (!gpu)
return -ENOMEM;