diff options
| author | Nicolas Saenz Julienne <nsaenzjulienne@suse.de> | 2020-07-14 14:39:25 +0200 |
|---|---|---|
| committer | Christoph Hellwig <hch@lst.de> | 2020-07-14 15:42:24 +0200 |
| commit | 567f6a6eba0c09e5f502e0290e57651befa8aacb (patch) | |
| tree | ffc1568d007cbdfb6740ecac29c11d0e1d3f1d20 | |
| parent | 0dc589da873b58b70f4caf4b070fb0cf70fdd1dc (diff) | |
dma-direct: provide function to check physical memory area validity
dma_coherent_ok() checks if a physical memory area fits a device's DMA
constraints.
Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
Signed-off-by: Christoph Hellwig <hch@lst.de>
| -rw-r--r-- | include/linux/dma-direct.h | 1 | ||||
| -rw-r--r-- | kernel/dma/direct.c | 2 |
2 files changed, 2 insertions, 1 deletions
diff --git a/include/linux/dma-direct.h b/include/linux/dma-direct.h index 5184735a0fe8..ab2e20cba951 100644 --- a/include/linux/dma-direct.h +++ b/include/linux/dma-direct.h @@ -69,6 +69,7 @@ static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size, u64 dma_direct_get_required_mask(struct device *dev); gfp_t dma_direct_optimal_gfp_mask(struct device *dev, u64 dma_mask, u64 *phys_mask); +bool dma_coherent_ok(struct device *dev, phys_addr_t phys, size_t size); void *dma_direct_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle, gfp_t gfp, unsigned long attrs); void dma_direct_free(struct device *dev, size_t size, void *cpu_addr, diff --git a/kernel/dma/direct.c b/kernel/dma/direct.c index 95866b647581..67f060b86a73 100644 --- a/kernel/dma/direct.c +++ b/kernel/dma/direct.c @@ -70,7 +70,7 @@ gfp_t dma_direct_optimal_gfp_mask(struct device *dev, u64 dma_mask, return 0; } -static bool dma_coherent_ok(struct device *dev, phys_addr_t phys, size_t size) +bool dma_coherent_ok(struct device *dev, phys_addr_t phys, size_t size) { return phys_to_dma_direct(dev, phys) + size - 1 <= min_not_zero(dev->coherent_dma_mask, dev->bus_dma_limit); |