[Intel-gfx] [PATCH igt] lib: Disable MI_STORE_DATA_IMM for gen3 (i915g and i915gm)

[Ville Syrjälä]

On Wed, Sep 06, 2017 at 03:36:15PM +0100, Chris Wilson wrote:
> The early gen3 machines inherited the MI block and restrictions from
> gen2, and may only use physical addresses in conjunction with
> MI_STORE_DATA_IMM -- that makes it unusable for us from userspace, where
> we can only use virtual offsets.

Matches my docs.

Reviewed-by: Ville Syrjälä <ville.syrjala at linux.intel.com>

> 
> Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
> ---
>  lib/igt_gt.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/lib/igt_gt.c b/lib/igt_gt.c
> index d5e8b557..b3f3b380 100644
> --- a/lib/igt_gt.c
> +++ b/lib/igt_gt.c
> @@ -557,6 +557,9 @@ bool gem_can_store_dword(int fd, unsigned int engine)
>  	if (gen <= 2) /* requires physical addresses */
>  		return false;
>  
> +	if (gen == 3 && (info->is_grantsdale || info->is_alviso))
> +		return false; /* only supports physical addresses */
> +
>  	if (gen == 6 && (engine & ~(3<<13)) == I915_EXEC_BSD)
>  		return false; /* kills the machine! */
>  
> -- 
> 2.14.1
> 
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-- 
Ville Syrjälä
Intel OTC