On Tue, 11 May 2010 19:22:14 +0100 Chris Wilson <chris at chris-wilson.co.uk>
wrote:
> + reloc_offset = src_priv->gtt_offset;
> for (page = 0; page < page_count; page++) {
> - void *s, *d = kmalloc(PAGE_SIZE, GFP_ATOMIC);
> + void __iomem *s;
> + void *d;
> +
> + d = kmalloc(PAGE_SIZE, GFP_ATOMIC);
> if (d == NULL)
> goto unwind;
> - s = kmap_atomic(src_priv->pages[page], KM_USER0);
> - memcpy(d, s, PAGE_SIZE);
> - kunmap_atomic(s, KM_USER0);
> +
> + s = io_mapping_map_atomic_wc(dev_priv->mm.gtt_mapping,
> + reloc_offset);
> + memcpy_fromio(d, s, PAGE_SIZE);
> + io_mapping_unmap_atomic(s);
As mentioned in the other email, this will still corrupt the KM_USER0
slot, and will generate a debug_kmap_atomic() warning.
