Re: [Intel-gfx] [PATCH v8 02/10] drm/i915: limit ttm to dma32 for i965G[M]

["Thomas Hellström" <thomas.hellstrom@linux.intel.com>]

On 6/21/22 22:00, Robert Beckett wrote:
> i965G[M] cannot relocate objects above 4GiB.
> Ensure ttm uses dma32 on these systems.
>
> Signed-off-by: Robert Beckett <bob.beckett@collabora.com>

LGTM.

Reviewed-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>


> ---
>   drivers/gpu/drm/i915/intel_region_ttm.c | 7 ++++++-
>   1 file changed, 6 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_region_ttm.c b/drivers/gpu/drm/i915/intel_region_ttm.c
> index 62ff77445b01..fd2ecfdd8fa1 100644
> --- a/drivers/gpu/drm/i915/intel_region_ttm.c
> +++ b/drivers/gpu/drm/i915/intel_region_ttm.c
> @@ -32,10 +32,15 @@
>   int intel_region_ttm_device_init(struct drm_i915_private *dev_priv)
>   {
>   	struct drm_device *drm = &dev_priv->drm;
> +	bool use_dma32 = false;
> +
> +	/* i965g[m] cannot relocate objects above 4GiB. */
> +	if (IS_I965GM(dev_priv) || IS_I965G(dev_priv))
> +		use_dma32 = true;
>   
>   	return ttm_device_init(&dev_priv->bdev, i915_ttm_driver(),
>   			       drm->dev, drm->anon_inode->i_mapping,
> -			       drm->vma_offset_manager, false, false);
> +			       drm->vma_offset_manager, false, use_dma32);
>   }
>   
>   /**