Re: [PATCH] drm/i915/tgl: Disable read-only support

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

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

> The same read-only affliction as befell Icelake is affecting Tigerlake.
> Disable the read-only support as cleary it was not fixed.
>
> Testcase: igt/i915_selftests/live_gem_context
> References: 3936867dbc1e ("drm/i915: Disable read only ppgtt support for gen11")
> Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
> Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>

Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>

> ---
>  drivers/gpu/drm/i915/i915_gem_gtt.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c
> index e4f66bfe74c2..a09a9b62afbe 100644
> --- a/drivers/gpu/drm/i915/i915_gem_gtt.c
> +++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
> @@ -1486,8 +1486,10 @@ static struct i915_ppgtt *gen8_ppgtt_create(struct drm_i915_private *i915)
>  	 *
>  	 * Gen11 has HSDES#:1807136187 unresolved. Disable ro support
>  	 * for now.
> +	 *
> +	 * Gen12 has inherited the same read-only fault issue from gen11.
>  	 */
> -	ppgtt->vm.has_read_only = INTEL_GEN(i915) != 11;
> +	ppgtt->vm.has_read_only = !IS_GEN_RANGE(i915, 11, 12);
>  
>  	/* There are only few exceptions for gen >=6. chv and bxt.
>  	 * And we are not sure about the latter so play safe for now.
> -- 
> 2.23.0
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