Re: [PATCH 03/25] drm/i915: Prevent user context creation while wedged

[Mika Kuoppala <mika.kuoppala@linux.intel.com>]

Chris Wilson <chris@chris-wilson.co.uk> writes:

> Introduce a new ABI method for detecting a wedged driver by reporting
> -EIO from DRM_IOCTL_I915_GEM_CONTEXT_CREATE.

Need more on the 'why' department. What is lacking with
the method of submitting and noticing the wedged?

Also detecting banned from wedged is not trivial.

I am trying to figure out what is the userspace
need and flow wrt this.

If we will have object parameters, should we
convey this type of information with status query?

-Mika

>
> Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
> Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
> ---
>  drivers/gpu/drm/i915/i915_gem_context.c | 11 ++++++++---
>  1 file changed, 8 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_gem_context.c b/drivers/gpu/drm/i915/i915_gem_context.c
> index 7541c6f961b3..7337aa01c361 100644
> --- a/drivers/gpu/drm/i915/i915_gem_context.c
> +++ b/drivers/gpu/drm/i915/i915_gem_context.c
> @@ -802,18 +802,23 @@ static bool client_is_banned(struct drm_i915_file_private *file_priv)
>  int i915_gem_context_create_ioctl(struct drm_device *dev, void *data,
>  				  struct drm_file *file)
>  {
> -	struct drm_i915_private *dev_priv = to_i915(dev);
> +	struct drm_i915_private *i915 = to_i915(dev);
>  	struct drm_i915_gem_context_create *args = data;
>  	struct drm_i915_file_private *file_priv = file->driver_priv;
>  	struct i915_gem_context *ctx;
>  	int ret;
>  
> -	if (!DRIVER_CAPS(dev_priv)->has_logical_contexts)
> +	if (!DRIVER_CAPS(i915)->has_logical_contexts)
>  		return -ENODEV;
>  
>  	if (args->pad != 0)
>  		return -EINVAL;
>  
> +	if (i915_terminally_wedged(&i915->gpu_error)) {
> +		DRM_DEBUG("driver is wedged; banning new ctx!\n");
> +		return -EIO;
> +	}
> +
>  	if (client_is_banned(file_priv)) {
>  		DRM_DEBUG("client %s[%d] banned from creating ctx\n",
>  			  current->comm,
> @@ -826,7 +831,7 @@ int i915_gem_context_create_ioctl(struct drm_device *dev, void *data,
>  	if (ret)
>  		return ret;
>  
> -	ctx = i915_gem_create_context(dev_priv, file_priv);
> +	ctx = i915_gem_create_context(i915, file_priv);
>  	mutex_unlock(&dev->struct_mutex);
>  	if (IS_ERR(ctx))
>  		return PTR_ERR(ctx);
> -- 
> 2.20.1
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