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

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Date:   Wed, 22 Jun 2022 12:45:50 +0200
From:   Thomas Hellström 
        <thomas.hellstrom@...ux.intel.com>
To:     Robert Beckett <bob.beckett@...labora.com>,
        dri-devel@...ts.freedesktop.org, intel-gfx@...ts.freedesktop.org,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        Tvrtko Ursulin <tvrtko.ursulin@...ux.intel.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>
Cc:     kernel@...labora.com, Matthew Auld <matthew.auld@...el.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v8 02/10] drm/i915: limit ttm to dma32 for i965G[M]


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@...labora.com>

LGTM.

Reviewed-by: Thomas Hellström <thomas.hellstrom@...ux.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);
>   }
>   
>   /**