On Mon, 22 Oct 2012 18:34:09 -0700
Ben Widawsky <ben at bwidawsk.net> wrote:
> HSW will change the PTE encoding, and laying this out now will be
> helpful when we're ready to implement that. More importantly, GGTT and
> PPGTT PTE encoding is quite similar, so moving this out into a helper
> function will enable us to lance the AGP layer.
>
> Signed-off-by: Ben Widawsky <ben at bwidawsk.net>
> ---
> drivers/gpu/drm/i915/i915_gem_gtt.c | 21 ++++++++++++++++-----
> 1 file changed, 16 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c
> index a769b3c..da9c1fa 100644
> --- a/drivers/gpu/drm/i915/i915_gem_gtt.c
> +++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
> @@ -31,6 +31,17 @@
>
> typedef uint32_t gtt_pte_t;
>
> +static inline gtt_pte_t pte_encode(struct drm_device *dev,
> + dma_addr_t addr,
> + gtt_pte_t cache_bits)
> +{
> + gtt_pte_t pte = GEN6_PTE_VALID;
> + pte |= GEN6_PTE_ADDR_ENCODE(addr);
> + pte |= cache_bits;
> +
> + return pte;
> +}
> +
> /* PPGTT support for Sandybdrige/Gen6 and later */
> static void i915_ppgtt_clear_range(struct i915_hw_ppgtt *ppgtt,
> unsigned first_entry,
> @@ -42,8 +53,8 @@ static void i915_ppgtt_clear_range(struct i915_hw_ppgtt *ppgtt,
> unsigned first_pte = first_entry % I915_PPGTT_PT_ENTRIES;
> unsigned last_pte, i;
>
> - scratch_pte = GEN6_PTE_ADDR_ENCODE(ppgtt->scratch_page_dma_addr);
> - scratch_pte |= GEN6_PTE_VALID | GEN6_PTE_CACHE_LLC;
> + scratch_pte = pte_encode(ppgtt->dev, ppgtt->scratch_page_dma_addr,
> + GEN6_PTE_CACHE_LLC);
>
> while (num_entries) {
> last_pte = first_pte + num_entries;
> @@ -174,7 +185,7 @@ static void i915_ppgtt_insert_sg_entries(struct i915_hw_ppgtt *ppgtt,
> unsigned first_entry,
> gtt_pte_t pte_flags)
> {
> - gtt_pte_t *pt_vaddr, pte;
> + gtt_pte_t *pt_vaddr;
> unsigned act_pd = first_entry / I915_PPGTT_PT_ENTRIES;
> unsigned first_pte = first_entry % I915_PPGTT_PT_ENTRIES;
> unsigned i, j, m, segment_len;
> @@ -192,8 +203,8 @@ static void i915_ppgtt_insert_sg_entries(struct i915_hw_ppgtt *ppgtt,
>
> for (j = first_pte; j < I915_PPGTT_PT_ENTRIES; j++) {
> page_addr = sg_dma_address(sg) + (m << PAGE_SHIFT);
> - pte = GEN6_PTE_ADDR_ENCODE(page_addr);
> - pt_vaddr[j] = pte | pte_flags;
> + pt_vaddr[j] = pte_encode(ppgtt->dev, page_addr,
> + pte_flags);
>
> /* grab the next page */
> if (++m == segment_len) {
Does this mean we can remove the GEN6_PTE_ADDR_ENCODE macro too?
Reviewed-by: Jesse Barnes <jbarnes at virtuousgeek.org>
--
Jesse Barnes, Intel Open Source Technology Center
