[PATCH 03/21] drm/i915/gem: Set the watchdog timeout directly in intel_context_set_gem

[Daniel Vetter]

On Fri, Apr 23, 2021 at 05:31:13PM -0500, Jason Ekstrand wrote:
> Instead of handling it like a context param, unconditionally set it when
> intel_contexts are created.  This doesn't fix anything but does simplify
> the code a bit.
> 
> Signed-off-by: Jason Ekstrand <jason at jlekstrand.net>

So the idea here is that since years we've had a watchdog uapi floating
about. Aim was for media, so that they could set very tight deadlines for
their transcodes jobs, so that if you have a corrupt bitstream (especially
for decoding) you don't hang your desktop unecessarily wrong.

But it's been stuck in limbo since forever, plus I get how this gets a bit
in the way of the proto ctx work, so makes sense to remove this prep work
again.

Maybe include the above in the commit message for a notch more context.

Reviewed-by: Daniel Vetter <daniel.vetter at ffwll.ch>
> ---
>  drivers/gpu/drm/i915/gem/i915_gem_context.c   | 43 +++----------------
>  .../gpu/drm/i915/gem/i915_gem_context_types.h |  4 --
>  drivers/gpu/drm/i915/gt/intel_context_param.h |  3 +-
>  3 files changed, 6 insertions(+), 44 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/gem/i915_gem_context.c b/drivers/gpu/drm/i915/gem/i915_gem_context.c
> index 35bcdeddfbf3f..1091cc04a242a 100644
> --- a/drivers/gpu/drm/i915/gem/i915_gem_context.c
> +++ b/drivers/gpu/drm/i915/gem/i915_gem_context.c
> @@ -233,7 +233,11 @@ static void intel_context_set_gem(struct intel_context *ce,
>  	    intel_engine_has_timeslices(ce->engine))
>  		__set_bit(CONTEXT_USE_SEMAPHORES, &ce->flags);
>  
> -	intel_context_set_watchdog_us(ce, ctx->watchdog.timeout_us);
> +	if (IS_ACTIVE(CONFIG_DRM_I915_REQUEST_TIMEOUT) &&
> +	    ctx->i915->params.request_timeout_ms) {
> +		unsigned int timeout_ms = ctx->i915->params.request_timeout_ms;
> +		intel_context_set_watchdog_us(ce, (u64)timeout_ms * 1000);
> +	}
>  }
>  
>  static void __free_engines(struct i915_gem_engines *e, unsigned int count)
> @@ -792,41 +796,6 @@ static void __assign_timeline(struct i915_gem_context *ctx,
>  	context_apply_all(ctx, __apply_timeline, timeline);
>  }
>  
> -static int __apply_watchdog(struct intel_context *ce, void *timeout_us)
> -{
> -	return intel_context_set_watchdog_us(ce, (uintptr_t)timeout_us);
> -}
> -
> -static int
> -__set_watchdog(struct i915_gem_context *ctx, unsigned long timeout_us)
> -{
> -	int ret;
> -
> -	ret = context_apply_all(ctx, __apply_watchdog,
> -				(void *)(uintptr_t)timeout_us);
> -	if (!ret)
> -		ctx->watchdog.timeout_us = timeout_us;
> -
> -	return ret;
> -}
> -
> -static void __set_default_fence_expiry(struct i915_gem_context *ctx)
> -{
> -	struct drm_i915_private *i915 = ctx->i915;
> -	int ret;
> -
> -	if (!IS_ACTIVE(CONFIG_DRM_I915_REQUEST_TIMEOUT) ||
> -	    !i915->params.request_timeout_ms)
> -		return;
> -
> -	/* Default expiry for user fences. */
> -	ret = __set_watchdog(ctx, i915->params.request_timeout_ms * 1000);
> -	if (ret)
> -		drm_notice(&i915->drm,
> -			   "Failed to configure default fence expiry! (%d)",
> -			   ret);
> -}
> -
>  static struct i915_gem_context *
>  i915_gem_create_context(struct drm_i915_private *i915, unsigned int flags)
>  {
> @@ -871,8 +840,6 @@ i915_gem_create_context(struct drm_i915_private *i915, unsigned int flags)
>  		intel_timeline_put(timeline);
>  	}
>  
> -	__set_default_fence_expiry(ctx);
> -
>  	trace_i915_context_create(ctx);
>  
>  	return ctx;
> diff --git a/drivers/gpu/drm/i915/gem/i915_gem_context_types.h b/drivers/gpu/drm/i915/gem/i915_gem_context_types.h
> index 5ae71ec936f7c..676592e27e7d2 100644
> --- a/drivers/gpu/drm/i915/gem/i915_gem_context_types.h
> +++ b/drivers/gpu/drm/i915/gem/i915_gem_context_types.h
> @@ -153,10 +153,6 @@ struct i915_gem_context {
>  	 */
>  	atomic_t active_count;
>  
> -	struct {
> -		u64 timeout_us;
> -	} watchdog;
> -
>  	/**
>  	 * @hang_timestamp: The last time(s) this context caused a GPU hang
>  	 */
> diff --git a/drivers/gpu/drm/i915/gt/intel_context_param.h b/drivers/gpu/drm/i915/gt/intel_context_param.h
> index dffedd983693d..0c69cb42d075c 100644
> --- a/drivers/gpu/drm/i915/gt/intel_context_param.h
> +++ b/drivers/gpu/drm/i915/gt/intel_context_param.h
> @@ -10,11 +10,10 @@
>  
>  #include "intel_context.h"
>  
> -static inline int
> +static inline void
>  intel_context_set_watchdog_us(struct intel_context *ce, u64 timeout_us)
>  {
>  	ce->watchdog.timeout_us = timeout_us;
> -	return 0;
>  }
>  
>  #endif /* INTEL_CONTEXT_PARAM_H */
> -- 
> 2.31.1
> 
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-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch