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dma-mapping fixes for 5.8

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- fixes for the SEV atomic pool (Geert Uytterhoeven and David Rientjes)
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Merge tag 'dma-mapping-5.8-3' of git://git.infradead.org/users/hch/dma-mapping

Pull dma-mapping fixes from Christoph Hellwig:
 "Fixes for the SEV atomic pool (Geert Uytterhoeven and David Rientjes)"

* tag 'dma-mapping-5.8-3' of git://git.infradead.org/users/hch/dma-mapping:
  dma-pool: decouple DMA_REMAP from DMA_COHERENT_POOL
  dma-pool: fix too large DMA pools on medium memory size systems
This commit is contained in:
Linus Torvalds 2020-06-17 11:29:37 -07:00
commit 1b50440210
2 changed files with 8 additions and 9 deletions
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10
kernel/dma/Kconfig
View file

@ -73,18 +73,18 @@ config SWIOTLB
config DMA_NONCOHERENT_MMAP
bool
config DMA_COHERENT_POOL
bool
config DMA_REMAP
bool
depends on MMU
select GENERIC_ALLOCATOR
select DMA_NONCOHERENT_MMAP
bool
config DMA_COHERENT_POOL
bool
select DMA_REMAP
config DMA_DIRECT_REMAP
bool
select DMA_REMAP
select DMA_COHERENT_POOL
config DMA_CMA

7
kernel/dma/pool.c
View file

@ -175,10 +175,9 @@ static int __init dma_atomic_pool_init(void)
* sizes to 128KB per 1GB of memory, min 128KB, max MAX_ORDER-1.
*/
if (!atomic_pool_size) {
atomic_pool_size = max(totalram_pages() >> PAGE_SHIFT, 1UL) *
SZ_128K;
atomic_pool_size = min_t(size_t, atomic_pool_size,
1 << (PAGE_SHIFT + MAX_ORDER-1));
unsigned long pages = totalram_pages() / (SZ_1G / SZ_128K);
pages = min_t(unsigned long, pages, MAX_ORDER_NR_PAGES);
atomic_pool_size = max_t(size_t, pages << PAGE_SHIFT, SZ_128K);
}
INIT_WORK(&atomic_pool_work, atomic_pool_work_fn);