Re: [PATCH v5 14/18] drm/i915: Watchdog timeout: Pass GuC shared data structure during param load

[Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>]

On Fri, Mar 24, 2017 at 06:30:06PM -0700, Michel Thierry wrote:
> For watchdog / media reset, the firmware must know the address of the shared
> data page (the first page of the default context).
> 
> This information should be in DWORD 9 of the GUC_CTL structure.
> 
> Signed-off-by: Michel Thierry <michel.thierry@xxxxxxxxx>
> ---
>  drivers/gpu/drm/i915/intel_guc_fwif.h   | 2 +-
>  drivers/gpu/drm/i915/intel_guc_loader.c | 8 ++++++++
>  2 files changed, 9 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/i915/intel_guc_fwif.h b/drivers/gpu/drm/i915/intel_guc_fwif.h
> index b627206b8f56..5db3def5f74e 100644
> --- a/drivers/gpu/drm/i915/intel_guc_fwif.h
> +++ b/drivers/gpu/drm/i915/intel_guc_fwif.h
> @@ -135,7 +135,7 @@
>  #define   GUC_ADS_ADDR_SHIFT		11
>  #define   GUC_ADS_ADDR_MASK		0xfffff800
>  
> -#define GUC_CTL_RSRVD			9
> +#define GUC_CTL_SHARED_DATA		9
>  
>  #define GUC_CTL_MAX_DWORDS		(SOFT_SCRATCH_COUNT - 2) /* [1..14] */
>  
> diff --git a/drivers/gpu/drm/i915/intel_guc_loader.c b/drivers/gpu/drm/i915/intel_guc_loader.c
> index 7d92321f8731..afa584864cb5 100644
> --- a/drivers/gpu/drm/i915/intel_guc_loader.c
> +++ b/drivers/gpu/drm/i915/intel_guc_loader.c
> @@ -119,6 +119,7 @@ static void guc_params_init(struct drm_i915_private *dev_priv)
>  {
>  	struct intel_guc *guc = &dev_priv->guc;
>  	u32 params[GUC_CTL_MAX_DWORDS];
> +	struct i915_gem_context *ctx;
>  	int i;
>  
>  	memset(&params, 0, sizeof(params));
> @@ -167,6 +168,13 @@ static void guc_params_init(struct drm_i915_private *dev_priv)
>  		params[GUC_CTL_FEATURE] &= ~GUC_CTL_DISABLE_SCHEDULER;
>  	}
>  
> +	/*
> +	 * For watchdog / media reset, GuC must know the address of the shared
> +	 * data page, which is the first page of the default context.
> +	 */
> +	ctx = dev_priv->kernel_context;
> +	params[GUC_CTL_SHARED_DATA] = i915_ggtt_offset(ctx->engine[RCS].state);

guc_ggtt_offset(), it's the same as i915_ggtt_offset() but with a couple
of extra guc specific checks.
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre
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