[Intel-gfx] [PATCH 1/3] drm/i915: Capture dmc firmware information before reset

[Chris Wilson]

On Fri, Feb 24, 2017 at 11:25:29AM -0800, Michel Thierry wrote:
> On 2/24/2017 11:22 AM, Chris Wilson wrote:
> >On Fri, Feb 24, 2017 at 11:05:28AM -0800, Michel Thierry wrote:
> >>The firmware may change between the hang and cat /sys/class/drm/card0/error
> >>
> >>Cc: Chris Wilson <chris at chris-wilson.co.uk>
> >>Signed-off-by: Michel Thierry <michel.thierry at intel.com>
> >
> >Looks sane...
> >
> >>---
> >> drivers/gpu/drm/i915/i915_drv.h       |  4 ++++
> >> drivers/gpu/drm/i915/i915_gpu_error.c | 22 ++++++++++++++++------
> >> 2 files changed, 20 insertions(+), 6 deletions(-)
> >>
> >>diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
> >>index a74b87b1b5a9..3b0cff05f5f7 100644
> >>--- a/drivers/gpu/drm/i915/i915_drv.h
> >>+++ b/drivers/gpu/drm/i915/i915_drv.h
> >>@@ -953,6 +953,10 @@ struct i915_gpu_state {
> >> 	u32 gab_ctl;
> >> 	u32 gfx_mode;
> >>
> >>+	/* Firmware load state */
> >>+	u32 dmc_loaded;
> >
> >Can dmc_version be zero? i.e. Does !0 => dmc_loaded?
> >
> 
> Nothing would stop them to build a v0.0 firmware, but in this case,
> we can save one variable.

On the other guc thread, the suggestion is to use 0 as an invalid
version...
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre