Commit 7924e5eb authored by Jerome Glisse's avatar Jerome Glisse Committed by Dave Airlie
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drm/radeon/kms: r600 handle irq vector ring overflow

In some rare case i faced an irq overflow quickly followed by
a GPU lockup (hard hang) this patch try to deal with irq vector
ring overflow, so far haven't been able to reproduce it with
the patch.
Signed-off-by: default avatarJerome Glisse <>
Reviewed-by: default avatarAlex Deucher <>
Signed-off-by: default avatarDave Airlie <>
parent 79c2bbc5
......@@ -2648,9 +2648,13 @@ static inline u32 r600_get_ih_wptr(struct radeon_device *rdev)
wptr = RREG32(IH_RB_WPTR);
if (wptr & RB_OVERFLOW) {
/* XXX deal with overflow */
DRM_ERROR("IH RB overflow\n");
/* When a ring buffer overflow happen start parsing interrupt
* from the last not overwritten vector (wptr + 16). Hopefully
* this should allow us to catchup.
dev_warn(rdev->dev, "IH ring buffer overflow (0x%08X, %d, %d)\n",
wptr, rdev->ih.rptr, (wptr + 16) + rdev->ih.ptr_mask);
rdev->ih.rptr = (wptr + 16) & rdev->ih.ptr_mask;
tmp = RREG32(IH_RB_CNTL);
WREG32(IH_RB_CNTL, tmp);
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