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authorChristoph Hellwig <hch@lst.de>2022-04-23 19:20:24 +0200
committerChristoph Hellwig <hch@lst.de>2022-05-11 19:48:34 +0200
commit92826e967535db2eb117db227b1191aaf98e4bb3 (patch)
tree2fb3ee8b76f889d97696455041fdc031f871d9ed /kernel/dma
parent566fb90e050dfa2132340bbdab9533b727dda6f1 (diff)
dma-direct: don't fail on highmem CMA pages in dma_direct_alloc_pages
When dma_direct_alloc_pages encounters a highmem page it just gives up currently. But what we really should do is to try memory using the page allocator instead - without this platforms with a global highmem CMA pool will fail all dma_alloc_pages allocations. Fixes: efa70f2fdc84 ("dma-mapping: add a new dma_alloc_pages API") Reported-by: Mark O'Neill <mao@tumblingdice.co.uk> Signed-off-by: Christoph Hellwig <hch@lst.de>
Diffstat (limited to 'kernel/dma')
-rw-r--r--kernel/dma/direct.c27
1 files changed, 10 insertions, 17 deletions
diff --git a/kernel/dma/direct.c b/kernel/dma/direct.c
index 9743c6ccce1a..3e7f4aab740e 100644
--- a/kernel/dma/direct.c
+++ b/kernel/dma/direct.c
@@ -115,7 +115,7 @@ static struct page *dma_direct_alloc_swiotlb(struct device *dev, size_t size)
}
static struct page *__dma_direct_alloc_pages(struct device *dev, size_t size,
- gfp_t gfp)
+ gfp_t gfp, bool allow_highmem)
{
int node = dev_to_node(dev);
struct page *page = NULL;
@@ -129,9 +129,12 @@ static struct page *__dma_direct_alloc_pages(struct device *dev, size_t size,
gfp |= dma_direct_optimal_gfp_mask(dev, dev->coherent_dma_mask,
&phys_limit);
page = dma_alloc_contiguous(dev, size, gfp);
- if (page && !dma_coherent_ok(dev, page_to_phys(page), size)) {
- dma_free_contiguous(dev, page, size);
- page = NULL;
+ if (page) {
+ if (!dma_coherent_ok(dev, page_to_phys(page), size) ||
+ (!allow_highmem && PageHighMem(page))) {
+ dma_free_contiguous(dev, page, size);
+ page = NULL;
+ }
}
again:
if (!page)
@@ -189,7 +192,7 @@ static void *dma_direct_alloc_no_mapping(struct device *dev, size_t size,
{
struct page *page;
- page = __dma_direct_alloc_pages(dev, size, gfp & ~__GFP_ZERO);
+ page = __dma_direct_alloc_pages(dev, size, gfp & ~__GFP_ZERO, true);
if (!page)
return NULL;
@@ -262,7 +265,7 @@ void *dma_direct_alloc(struct device *dev, size_t size,
return dma_direct_alloc_from_pool(dev, size, dma_handle, gfp);
/* we always manually zero the memory once we are done */
- page = __dma_direct_alloc_pages(dev, size, gfp & ~__GFP_ZERO);
+ page = __dma_direct_alloc_pages(dev, size, gfp & ~__GFP_ZERO, true);
if (!page)
return NULL;
@@ -370,19 +373,9 @@ struct page *dma_direct_alloc_pages(struct device *dev, size_t size,
if (force_dma_unencrypted(dev) && dma_direct_use_pool(dev, gfp))
return dma_direct_alloc_from_pool(dev, size, dma_handle, gfp);
- page = __dma_direct_alloc_pages(dev, size, gfp);
+ page = __dma_direct_alloc_pages(dev, size, gfp, false);
if (!page)
return NULL;
- if (PageHighMem(page)) {
- /*
- * Depending on the cma= arguments and per-arch setup
- * dma_alloc_contiguous could return highmem pages.
- * Without remapping there is no way to return them here,
- * so log an error and fail.
- */
- dev_info(dev, "Rejecting highmem page from CMA.\n");
- goto out_free_pages;
- }
ret = page_address(page);
if (dma_set_decrypted(dev, ret, size))