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

["Kamble, Sagar A" <sagar.a.kamble@intel.com>]

On 2/24/2017 4:19 PM, 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...
> -Chris
>
GT reset count is present already in error state. GuC kernel parameters 
are present and this
change will help us identify which firmware issue was encountered.
So I feel printing ver_found should be enough.
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