From 6a15abd604272645d204a166b5b92452efa4b8f9 Mon Sep 17 00:00:00 2001 From: Mark-PK Tsai Date: Fri, 22 Apr 2022 14:24:35 +0800 Subject: [PATCH] FROMLIST: dma-mapping: Add dma_release_coherent_memory to DMA API 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 Bug: 233721768 Link: https://lore.kernel.org/lkml/20220422062436.14384-2-mark-pk.tsai@mediatek.com/ Change-Id: Ief72cf5bbe18a977bae76a1e5799ebc06b46d791 Signed-off-by: Mark-PK Tsai (cherry picked from commit 137066946c448e67c4b5b344949ab0c3aec62dfa) --- include/linux/dma-map-ops.h | 3 +++ kernel/dma/coherent.c | 10 ++++++++-- 2 files changed, 11 insertions(+), 2 deletions(-) diff --git a/include/linux/dma-map-ops.h b/include/linux/dma-map-ops.h index 84c14dbcdb66..b9a8549f9a7f 100644 --- a/include/linux/dma-map-ops.h +++ b/include/linux/dma-map-ops.h @@ -171,6 +171,7 @@ 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); @@ -189,6 +190,8 @@ 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) diff --git a/kernel/dma/coherent.c b/kernel/dma/coherent.c index 5b5b6c7ec7f2..b79d8d0433dd 100644 --- a/kernel/dma/coherent.c +++ b/kernel/dma/coherent.c @@ -84,7 +84,7 @@ static int dma_init_coherent_memory(phys_addr_t phys_addr, return ret; } -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; @@ -136,10 +136,16 @@ 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)