Re: [PATCH] drm/i915: Include GuC fw version in error state

[Michel Thierry <michel.thierry@intel.com>]

On 2/24/2017 2:49 AM, Chris Wilson wrote:
> On Fri, Feb 24, 2017 at 11:43:32AM +0100, Michal Wajdeczko wrote:
>> On Fri, Feb 24, 2017 at 09:13:29AM +0000, Chris Wilson wrote:
>>> On Fri, Feb 24, 2017 at 09:13:05AM +0530, Kamble, Sagar A wrote:
>>>>    Reviewed-by: Sagar Arun Kamble [1]<sagar.a.kamble@intel.com>
>>>>
>>>>    On 2/24/2017 4:41 AM, Michel Thierry wrote:
>>>>
>>>>  There was no way to check if the platform is running the latest firmware.
>>>>
>>>>  Cc: Tvrtko Ursulin [2]<tvrtko.ursulin@intel.com>
>>>>  Cc: Arkadiusz Hiler [3]<arkadiusz.hiler@intel.com>
>>>>  Signed-off-by: Michel Thierry [4]<michel.thierry@intel.com>
>>>>  ---
>>>>   drivers/gpu/drm/i915/i915_gpu_error.c | 10 ++++++++++
>>>>   1 file changed, 10 insertions(+)
>>>>
>>>>  diff --git a/drivers/gpu/drm/i915/i915_gpu_error.c b/drivers/gpu/drm/i915/i915_gpu_error.c
>>>>  index 2b1d15668192..e022187916ee 100644
>>>>  --- a/drivers/gpu/drm/i915/i915_gpu_error.c
>>>>  +++ b/drivers/gpu/drm/i915/i915_gpu_error.c
>>>>  @@ -632,6 +632,16 @@ int i915_error_state_to_str(struct drm_i915_error_state_buf *m,
>>>>                             CSR_VERSION_MINOR(csr->version));
>>>>          }
>>>>
>>>>  +       if (HAS_GUC_UCODE(dev_priv)) {
>>>>  +               struct intel_uc_fw *guc_fw = &dev_priv->guc.fw;
>>>>  +
>>>>  +               err_printf(m, "GuC loaded: %s\n",
>>>>  +                          yesno(guc_fw->load_status ==
>>>>  +                                INTEL_UC_FIRMWARE_SUCCESS));
>>>>  +               err_printf(m, "GuC fw version: %d.%d\n",
>>>>  +                          guc_fw->major_ver_found, guc_fw->minor_ver_found);
>>>>  +       }
>>>>  +
>>>
>>> Hmm. The firmware may change between the hang and cat
>>> /sys/class/drm/card0/error (as it will be reloaded after the reset).
>>
>> Btw, maybe we should add counter that will be incremented on each fw reload
>> and reported here ?
>
> If it occurs to you that we need it for post-mortem debugging and having
> it is worth more than any potential confusion....
>
> I can see the need for knowing what guc/huc/dmc/etc was running at the
> time of a hang - I just hope that what was previously running before an
> earlier reset doesn't contribute. But that's why we focus on the first
> error in a system...

Can the firmware change?
Last time I checked the filename was hard-coded in the driver. It's true 
that the load process could fail and then the information be incorrect.
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