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drm/i915: use for_each_sg_page for setting up the gtt ptes

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The existing gtt setup code is correct - and so doesn't need to be fixed to
handle compact dma scatter lists similarly to the previous patches. Still,
take the for_each_sg_page macro into use, to get somewhat simpler code.

Signed-off-by: Imre Deak <imre.deak@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Imre Deak 2013-02-18 19:28:04 +02:00 committed by Daniel Vetter
parent 90797e6d1e
commit 6e995e231a
1 changed files with 22 additions and 41 deletions
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63
drivers/gpu/drm/i915/i915_gem_gtt.c
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@ -116,41 +116,26 @@ static void gen6_ppgtt_insert_entries(struct i915_hw_ppgtt *ppgtt,
{
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;
dma_addr_t page_addr;
struct scatterlist *sg;
unsigned act_pte = first_entry % I915_PPGTT_PT_ENTRIES;
struct sg_page_iter sg_iter;
/* init sg walking */
sg = pages->sgl;
i = 0;
segment_len = sg_dma_len(sg) >> PAGE_SHIFT;
m = 0;
pt_vaddr = kmap_atomic(ppgtt->pt_pages[act_pd]);
for_each_sg_page(pages->sgl, &sg_iter, pages->nents, 0) {
dma_addr_t page_addr;
while (i < pages->nents) {
pt_vaddr = kmap_atomic(ppgtt->pt_pages[act_pd]);
page_addr = sg_dma_address(sg_iter.sg) +
(sg_iter.sg_pgoffset << PAGE_SHIFT);
pt_vaddr[act_pte] = gen6_pte_encode(ppgtt->dev, page_addr,
cache_level);
if (++act_pte == I915_PPGTT_PT_ENTRIES) {
kunmap_atomic(pt_vaddr);
act_pd++;
pt_vaddr = kmap_atomic(ppgtt->pt_pages[act_pd]);
act_pte = 0;
for (j = first_pte; j < I915_PPGTT_PT_ENTRIES; j++) {
page_addr = sg_dma_address(sg) + (m << PAGE_SHIFT);
pt_vaddr[j] = gen6_pte_encode(ppgtt->dev, page_addr,
cache_level);
/* grab the next page */
if (++m == segment_len) {
if (++i == pages->nents)
break;
sg = sg_next(sg);
segment_len = sg_dma_len(sg) >> PAGE_SHIFT;
m = 0;
}
}
kunmap_atomic(pt_vaddr);
first_pte = 0;
act_pd++;
}
kunmap_atomic(pt_vaddr);
}
static void gen6_ppgtt_cleanup(struct i915_hw_ppgtt *ppgtt)
@ -432,21 +417,17 @@ static void gen6_ggtt_insert_entries(struct drm_device *dev,
enum i915_cache_level level)
{
struct drm_i915_private *dev_priv = dev->dev_private;
struct scatterlist *sg = st->sgl;
gtt_pte_t __iomem *gtt_entries =
(gtt_pte_t __iomem *)dev_priv->gtt.gsm + first_entry;
int unused, i = 0;
unsigned int len, m = 0;
int i = 0;
struct sg_page_iter sg_iter;
dma_addr_t addr;
for_each_sg(st->sgl, sg, st->nents, unused) {
len = sg_dma_len(sg) >> PAGE_SHIFT;
for (m = 0; m < len; m++) {
addr = sg_dma_address(sg) + (m << PAGE_SHIFT);
iowrite32(gen6_pte_encode(dev, addr, level),
&gtt_entries[i]);
i++;
}
for_each_sg_page(st->sgl, &sg_iter, st->nents, 0) {
addr = sg_dma_address(sg_iter.sg) +
(sg_iter.sg_pgoffset << PAGE_SHIFT);
iowrite32(gen6_pte_encode(dev, addr, level), &gtt_entries[i]);
i++;
}
/* XXX: This serves as a posting read to make sure that the PTE has