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drm/ttm: DMA map/unmap consecutive pages as a whole v2 

Instead of mapping them bit by bit map/unmap all consecutive
pages as in one call.

v2: test for consecutive pages instead of using compound page order.

Signed-off-by: Christian König <christian.koenig@amd.com>
Acked-by: Felix Kuehling <Felix.Kuehling@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Christian König 2017-09-20 14:07:02 +02:00 committed by Alex Deucher
parent c6e839a3e2
commit 6056a1a565
1 changed files with 39 additions and 9 deletions
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46
drivers/gpu/drm/ttm/ttm_page_alloc.c
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@ -922,16 +922,26 @@ EXPORT_SYMBOL(ttm_pool_unpopulate);
#if defined(CONFIG_SWIOTLB) || defined(CONFIG_INTEL_IOMMU)
int ttm_populate_and_map_pages(struct device *dev, struct ttm_dma_tt *tt)
{
unsigned i;
unsigned i, j;
int r;
r = ttm_pool_populate(&tt->ttm);
if (r)
return r;
for (i = 0; i < tt->ttm.num_pages; i++) {
for (i = 0; i < tt->ttm.num_pages; ++i) {
struct page *p = tt->ttm.pages[i];
size_t num_pages = 1;
for (j = i + 1; j < tt->ttm.num_pages; ++j) {
if (++p != tt->ttm.pages[j])
break;
++num_pages;
}
tt->dma_address[i] = dma_map_page(dev, tt->ttm.pages[i],
0, PAGE_SIZE,
0, num_pages * PAGE_SIZE,
DMA_BIDIRECTIONAL);
if (dma_mapping_error(dev, tt->dma_address[i])) {
while (i--) {
@ -942,6 +952,11 @@ int ttm_populate_and_map_pages(struct device *dev, struct ttm_dma_tt *tt)
ttm_pool_unpopulate(&tt->ttm);
return -EFAULT;
}
for (j = 1; j < num_pages; ++j) {
tt->dma_address[i + 1] = tt->dma_address[i] + PAGE_SIZE;
++i;
}
}
return 0;
}
@ -949,13 +964,28 @@ EXPORT_SYMBOL(ttm_populate_and_map_pages);
void ttm_unmap_and_unpopulate_pages(struct device *dev, struct ttm_dma_tt *tt)
{
unsigned i;
unsigned i, j;
for (i = 0; i < tt->ttm.num_pages; i++) {
if (tt->dma_address[i]) {
dma_unmap_page(dev, tt->dma_address[i],
PAGE_SIZE, DMA_BIDIRECTIONAL);
for (i = 0; i < tt->ttm.num_pages;) {
struct page *p = tt->ttm.pages[i];
size_t num_pages = 1;
if (!tt->dma_address[i] || !tt->ttm.pages[i]) {
++i;
continue;
}
for (j = i + 1; j < tt->ttm.num_pages; ++j) {
if (++p != tt->ttm.pages[j])
break;
++num_pages;
}
dma_unmap_page(dev, tt->dma_address[i], num_pages * PAGE_SIZE,
DMA_BIDIRECTIONAL);
i += num_pages;
}
ttm_pool_unpopulate(&tt->ttm);
}