On 18 Oct. 2016 17:23, "Edward O'Callaghan" <funfunctor at folklore1984.net> wrote: > > NACK, > > I think you want to use 'iomap_create_wc()' instead to avoid aliasing. Please explain what can alias here? Dave. > > Kind Regards, > Edward. > > On 10/18/2016 05:13 PM, Dave Airlie wrote: > > From: Dave Airlie <airlied at redhat.com> > > > > These functions are needed for gpu/ttm drivers to reserve the > > VRAM area as write combined. In a lot of places we don't ioremap > > but still need to insert pfn from it into a VMA using vm_insert_mixed, > > but a recent change in mixed insertion means we need to reserve > > VRAM as WC upfront, so we need these APIs exported. > > > > Signed-off-by: Dave Airlie <airlied at redhat.com> > > --- > > arch/x86/mm/pat.c | 2 ++ > > 1 file changed, 2 insertions(+) > > > > diff --git a/arch/x86/mm/pat.c b/arch/x86/mm/pat.c > > index 170cc4f..5ce2fbb 100644 > > --- a/arch/x86/mm/pat.c > > +++ b/arch/x86/mm/pat.c > > @@ -719,6 +719,7 @@ out_free: > > out_err: > > return ret; > > } > > +EXPORT_SYMBOL(io_reserve_memtype); > > > > /** > > * io_free_memtype - Release a memory type mapping for a region of memory > > @@ -729,6 +730,7 @@ void io_free_memtype(resource_size_t start, resource_size_t end) > > { > > free_memtype(start, end); > > } > > +EXPORT_SYMBOL(io_free_memtype); > > > > pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn, > > unsigned long size, pgprot_t vma_prot) > > > -------------- next part -------------- An HTML attachment was scrubbed... URL: <https://lists.freedesktop.org/archives/amd-gfx/attachments/20161018/434ffdbf/attachment.html>