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SubjectRe: [PATCH] drm/i915: fix memory corruption with GM965 and >4GB RAM
On Tue, 1 Mar 2011 23:24:16 +0100, Jan Niehusmann <> wrote:
> Indeed, setting dma_alloc_coherent should be sufficient, AFAIKT. After
> all, only the HWS seems to be affected, which is allocated with
> drm_pci_alloc, which in turn uses dma_alloc_coherent.
> I just tried the patch below, it also works for me (as expected). Added
> the comment because otherwise it wouldn't be obvious why the mask gets
> set to 32 bit.
> What I don't know is if really only Broadwater and Crestline chips are
> affected. The tests were done with a Crestline one. But I think it's a
> fair guess that the bug would have been noticed earlier if more recent
> chips were affected, as >4GB RAM have become much more common since then.

The later chips do not use a physical address for the hardware status
page. The patch looks good, thanks.

Chris Wilson, Intel Open Source Technology Centre

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