diff options
| author | Christoph Hellwig <hch@lst.de> | 2019-08-03 12:42:15 +0300 |
|---|---|---|
| committer | Christoph Hellwig <hch@lst.de> | 2019-08-29 16:43:33 +0200 |
| commit | 8e3a68fb55e00e0760bd8023883e064f1f93c62d (patch) | |
| tree | 534cbf26b705987972b800501afec405b9175533 /kernel/dma | |
| parent | 419e2f1838819e954071dfa1d1f820ab3386ada1 (diff) | |
| download | linux-8e3a68fb55e00e0760bd8023883e064f1f93c62d.tar.bz2 | |
dma-mapping: make dma_atomic_pool_init self-contained
The memory allocated for the atomic pool needs to have the same
mapping attributes that we use for remapping, so use
pgprot_dmacoherent instead of open coding it. Also deduct a
suitable zone to allocate the memory from based on the presence
of the DMA zones.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Diffstat (limited to 'kernel/dma')
| -rw-r--r-- | kernel/dma/remap.c | 17 |
1 files changed, 14 insertions, 3 deletions
diff --git a/kernel/dma/remap.c b/kernel/dma/remap.c index ffe78f0b2fe4..838123f79639 100644 --- a/kernel/dma/remap.c +++ b/kernel/dma/remap.c @@ -105,7 +105,16 @@ static int __init early_coherent_pool(char *p) } early_param("coherent_pool", early_coherent_pool); -int __init dma_atomic_pool_init(gfp_t gfp, pgprot_t prot) +static gfp_t dma_atomic_pool_gfp(void) +{ + if (IS_ENABLED(CONFIG_ZONE_DMA)) + return GFP_DMA; + if (IS_ENABLED(CONFIG_ZONE_DMA32)) + return GFP_DMA32; + return GFP_KERNEL; +} + +static int __init dma_atomic_pool_init(void) { unsigned int pool_size_order = get_order(atomic_pool_size); unsigned long nr_pages = atomic_pool_size >> PAGE_SHIFT; @@ -117,7 +126,7 @@ int __init dma_atomic_pool_init(gfp_t gfp, pgprot_t prot) page = dma_alloc_from_contiguous(NULL, nr_pages, pool_size_order, false); else - page = alloc_pages(gfp, pool_size_order); + page = alloc_pages(dma_atomic_pool_gfp(), pool_size_order); if (!page) goto out; @@ -128,7 +137,8 @@ int __init dma_atomic_pool_init(gfp_t gfp, pgprot_t prot) goto free_page; addr = dma_common_contiguous_remap(page, atomic_pool_size, VM_USERMAP, - prot, __builtin_return_address(0)); + pgprot_dmacoherent(PAGE_KERNEL), + __builtin_return_address(0)); if (!addr) goto destroy_genpool; @@ -155,6 +165,7 @@ out: atomic_pool_size / 1024); return -ENOMEM; } +postcore_initcall(dma_atomic_pool_init); bool dma_in_atomic_pool(void *start, size_t size) { |