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Subject[PATCH 2/5] tm: Utilize the dma_addr_t array for pages that are to in DMA32 pool.
Date
We only use the "if (pool == NULL)" path for right now.

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
---
drivers/gpu/drm/ttm/ttm_page_alloc.c | 26 +++++++++++++++++++++++---
1 files changed, 23 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/ttm/ttm_page_alloc.c b/drivers/gpu/drm/ttm/ttm_page_alloc.c
index 6859288..5d09677 100644
--- a/drivers/gpu/drm/ttm/ttm_page_alloc.c
+++ b/drivers/gpu/drm/ttm/ttm_page_alloc.c
@@ -683,14 +683,22 @@ int ttm_get_pages(struct list_head *pages, int flags,
gfp_flags |= GFP_HIGHUSER;

for (r = 0; r < count; ++r) {
- p = alloc_page(gfp_flags);
+ if ((flags & TTM_PAGE_FLAG_DMA32) && dma_address) {
+ void *addr;
+ addr = dma_alloc_coherent(NULL, PAGE_SIZE,
+ &dma_address[r],
+ gfp_flags);
+ if (addr == NULL)
+ return -ENOMEM;
+ p = virt_to_page(addr);
+ } else
+ p = alloc_page(gfp_flags);
if (!p) {

printk(KERN_ERR TTM_PFX
"Unable to allocate page.");
return -ENOMEM;
}
-
list_add(&p->lru, pages);
}
return 0;
@@ -739,12 +747,24 @@ void ttm_put_pages(struct list_head *pages, unsigned page_count, int flags,
unsigned long irq_flags;
struct ttm_page_pool *pool = ttm_get_pool(flags, cstate);
struct page *p, *tmp;
+ unsigned r;

if (pool == NULL) {
/* No pool for this memory type so free the pages */

+ r = page_count-1;
list_for_each_entry_safe(p, tmp, pages, lru) {
- __free_page(p);
+ if ((flags & TTM_PAGE_FLAG_DMA32) && dma_address) {
+ void *addr = page_address(p);
+ WARN_ON(!addr || !dma_address[r]);
+ if (addr)
+ dma_free_coherent(NULL, PAGE_SIZE,
+ addr,
+ dma_address[r]);
+ dma_address[r] = 0;
+ } else
+ __free_page(p);
+ r--;
}
/* Make the pages list empty */
INIT_LIST_HEAD(pages);
--
1.7.1


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