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drm/ttm: add transparent huge page support for cached allocations v2 

Try to allocate huge pages when it makes sense.

v2: avoid compound pages for now

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 15:06:12 +02:00 committed by Alex Deucher
parent f4c809914a
commit 0284f1ead8
1 changed files with 42 additions and 8 deletions
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50
drivers/gpu/drm/ttm/ttm_page_alloc.c
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@ -685,12 +685,24 @@ static void ttm_put_pages(struct page **pages, unsigned npages, int flags,
if (pool == NULL) {
/* No pool for this memory type so free the pages */
for (i = 0; i < npages; i++) {
if (pages[i]) {
if (page_count(pages[i]) != 1)
pr_err("Erroneous page count. Leaking pages.\n");
__free_page(pages[i]);
pages[i] = NULL;
i = 0;
while (i < npages) {
unsigned order;
if (!pages[i]) {
++i;
continue;
}
if (page_count(pages[i]) != 1)
pr_err("Erroneous page count. Leaking pages.\n");
order = compound_order(pages[i]);
__free_pages(pages[i], order);
order = 1 << order;
while (order) {
pages[i++] = NULL;
--order;
}
}
return;
@ -740,12 +752,33 @@ static int ttm_get_pages(struct page **pages, unsigned npages, int flags,
/* No pool for cached pages */
if (pool == NULL) {
unsigned i, j;
if (flags & TTM_PAGE_FLAG_DMA32)
gfp_flags |= GFP_DMA32;
else
gfp_flags |= GFP_HIGHUSER;
for (r = 0; r < npages; ++r) {
i = 0;
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
while (npages >= HPAGE_PMD_NR) {
gfp_t huge_flags = gfp_flags;
huge_flags |= GFP_TRANSHUGE;
huge_flags &= ~__GFP_MOVABLE;
huge_flags &= ~__GFP_COMP;
p = alloc_pages(huge_flags, HPAGE_PMD_ORDER);
if (!p)
break;
for (j = 0; j < HPAGE_PMD_NR; ++j)
pages[i++] = p++;
npages -= HPAGE_PMD_NR;
}
#endif
while (npages) {
p = alloc_page(gfp_flags);
if (!p) {
@ -753,7 +786,8 @@ static int ttm_get_pages(struct page **pages, unsigned npages, int flags,
return -ENOMEM;
}
pages[r] = p;
pages[i++] = p;
--npages;
}
return 0;
}