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dma-mapping: Add dma_release_coherent_memory to DMA API

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Add dma_release_coherent_memory to DMA API to allow dma
user call it to release dev->dma_mem when the device is
removed.

Signed-off-by: Mark-PK Tsai <mark-pk.tsai@mediatek.com>
Acked-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20220422062436.14384-2-mark-pk.tsai@mediatek.com
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
This commit is contained in:
Mark-PK Tsai 2022-04-22 14:24:35 +08:00 committed by Mathieu Poirier
parent 61afafe8b9
commit e61c451476
2 changed files with 11 additions and 2 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

3
include/linux/dma-map-ops.h
View file

@ -166,6 +166,7 @@ static inline void dma_pernuma_cma_reserve(void) { }
#ifdef CONFIG_DMA_DECLARE_COHERENT
int dma_declare_coherent_memory(struct device *dev, phys_addr_t phys_addr,
dma_addr_t device_addr, size_t size);
void dma_release_coherent_memory(struct device *dev);
int dma_alloc_from_dev_coherent(struct device *dev, ssize_t size,
dma_addr_t *dma_handle, void **ret);
int dma_release_from_dev_coherent(struct device *dev, int order, void *vaddr);
@ -177,6 +178,8 @@ static inline int dma_declare_coherent_memory(struct device *dev,
{
return -ENOSYS;
}
#define dma_release_coherent_memory(dev) (0)
#define dma_alloc_from_dev_coherent(dev, size, handle, ret) (0)
#define dma_release_from_dev_coherent(dev, order, vaddr) (0)
#define dma_mmap_from_dev_coherent(dev, vma, vaddr, order, ret) (0)

10
kernel/dma/coherent.c
View file

@ -74,7 +74,7 @@ static struct dma_coherent_mem *dma_init_coherent_memory(phys_addr_t phys_addr,
return ERR_PTR(-ENOMEM);
}
static void dma_release_coherent_memory(struct dma_coherent_mem *mem)
static void _dma_release_coherent_memory(struct dma_coherent_mem *mem)
{
if (!mem)
return;
@ -126,10 +126,16 @@ int dma_declare_coherent_memory(struct device *dev, phys_addr_t phys_addr,
ret = dma_assign_coherent_memory(dev, mem);
if (ret)
dma_release_coherent_memory(mem);
_dma_release_coherent_memory(mem);
return ret;
}
void dma_release_coherent_memory(struct device *dev)
{
if (dev)
_dma_release_coherent_memory(dev->dma_mem);
}
static void *__dma_alloc_from_coherent(struct device *dev,
struct dma_coherent_mem *mem,
ssize_t size, dma_addr_t *dma_handle)