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dma-mapping: add a dma_init_global_coherent helper

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Add a new helper to initialize the global coherent pool.  This both
cleans up the existing initialization which indirects through the
reserved_mem_ops that are normally only used for struct device, and
also allows using the global pool for non-devicetree architectures.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Tested-by: Dillon Min <dillon.minfei@gmail.com>
This commit is contained in:
Christoph Hellwig
2021-06-23 16:05:05 +02:00
parent a6933571f3
commit 39a2d3506b
2 changed files with 15 additions and 19 deletions
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2
include/linux/dma-map-ops.h
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@@ -177,7 +177,7 @@ void *dma_alloc_from_global_coherent(struct device *dev, ssize_t size,
int dma_release_from_global_coherent(int order, void *vaddr);
int dma_mmap_from_global_coherent(struct vm_area_struct *vma, void *cpu_addr,
size_t size, int *ret);
int dma_init_global_coherent(phys_addr_t phys_addr, size_t size);
#else
static inline int dma_declare_coherent_memory(struct device *dev,
phys_addr_t phys_addr, dma_addr_t device_addr, size_t size)