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

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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@xxxxxxxxxxxxx>

LGTM.

Reviewed-by: Thomas Hellström <thomas.hellstrom@xxxxxxxxxxxxxxx>


---
  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);
  }
/**



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