On Mon, Mar 13, 2017 at 05:26:06PM -0700, Michel Thierry wrote:
> At least in bxt (with decoupled mmio), it prevents a warning while
> capturing the reg state:
>
> [ ] WARNING: assert_rpm_wakelock_held.part.4+0x1e/0x20 [i915]
> [ ] RPM wakelock ref not held during HW access
> [ ] Call Trace:
> [ ] dump_stack+0x63/0x87
> [ ] __warn+0xd1/0xf0
> [ ] ? fwtable_write32+0x1a0/0x1a0 [i915]
> [ ] warn_slowpath_fmt+0x4f/0x60
> [ ] ? vprintk_default+0x29/0x50
> [ ] assert_rpm_wakelock_held.part.4+0x1e/0x20 [i915]
> [ ] gen9_decoupled_read32+0x18a/0x1a0 [i915]
> [ ] ? fwtable_write32+0x1a0/0x1a0 [i915]
> [ ] i915_handle_error+0x1d0/0x260 [i915]
> [ ] ? __check_object_size+0x170/0x1aa
> [ ] i915_wedged_set+0x25/0x30 [i915]
>
> These get/put were removed by commit 9c870d03674f ("drm/i915: Use RPM as the
> barrier for controlling user mmap access"), before decoupled mmio was
> added in commit 85ee17ebeedd ("drm/i915/bxt: Broxton decoupled MMIO).
>
> Reported-by: Antonio Argenziano <antonio.argenziano@xxxxxxxxx>
> Signed-off-by: Michel Thierry <michel.thierry@xxxxxxxxx>
> ---
> drivers/gpu/drm/i915/i915_debugfs.c | 4 ++++
> 1 file changed, 4 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
> index 9fcc4f1a86fc..89f211391ef9 100644
> --- a/drivers/gpu/drm/i915/i915_debugfs.c
> +++ b/drivers/gpu/drm/i915/i915_debugfs.c
> @@ -4155,9 +4155,13 @@ i915_wedged_set(void *data, u64 val)
> if (i915_reset_in_progress(&dev_priv->gpu_error))
> return -EAGAIN;
>
> + intel_runtime_pm_get(dev_priv);
They don't belong here. i915_handle_error is already taking rpm, it just
forgot a path.
-Chris
--
Chris Wilson, Intel Open Source Technology Centre
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