NACK,
I think you want to use 'iomap_create_wc()' instead to avoid aliasing.
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)
>
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