On Fri, 2009-05-15 at 14:46 +1000, Benjamin Herrenschmidt wrote:
> Hi Jesse !
>
> Haven't had much time to investigate the problem I've been talking to
> you and David about but from what I can see in the code, we're probably
> hitting this in drm_mmap_locked() in drm_vm.c :
>
> /* Check for valid size. */
> if (map->size < vma->vm_end - vma->vm_start)
> return -EINVAL;
>
> Now, this won't do any good for example if the SAREA is 8K (which I
> think is about that nowadays) and the machine PAGE_SIZE is 64K.
Except that radeon_cp.c does:
sareapage = max_t(unsigned long, SAREA_MAX, PAGE_SIZE);
ret = drm_addmap(dev, 0, sareapage, _DRM_SHM,
_DRM_CONTAINS_LOCK|_DRM_DRIVER,
&master_priv->sarea);
So it should have worked ... hrm
I'll dig more.
Cheers,
Ben.
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