diff options
| author | Christoph Hellwig <hch@lst.de> | 2021-02-01 18:12:02 +0100 |
|---|---|---|
| committer | Christoph Hellwig <hch@lst.de> | 2021-03-15 10:02:31 +0100 |
| commit | 198c50e2ccff5c78ddbe0cb01593ac32458deb69 (patch) | |
| tree | cbe4886bfcfbe073e71912db1ea40dd82beea76c /kernel/dma/mapping.c | |
| parent | eedb0b12d091a21909b5e84d9f3e5e649305bd12 (diff) | |
dma-mapping: refactor dma_{alloc,free}_pages
Factour out internal versions without the dma_debug calls in preparation
for callers that will need different dma_debug calls.
Note that this changes the dma_debug calls to get the not page aligned
size values, but as long as alloc and free agree on one variant we are
fine.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Tomasz Figa <tfiga@chromium.org>
Tested-by: Ricardo Ribalda <ribalda@chromium.org>
Diffstat (limited to 'kernel/dma/mapping.c')
| -rw-r--r-- | kernel/dma/mapping.c | 29 |
1 files changed, 19 insertions, 10 deletions
diff --git a/kernel/dma/mapping.c b/kernel/dma/mapping.c index 9ce86c77651c..07f964ebcda1 100644 --- a/kernel/dma/mapping.c +++ b/kernel/dma/mapping.c @@ -477,11 +477,10 @@ void dma_free_attrs(struct device *dev, size_t size, void *cpu_addr, } EXPORT_SYMBOL(dma_free_attrs); -struct page *dma_alloc_pages(struct device *dev, size_t size, +static struct page *__dma_alloc_pages(struct device *dev, size_t size, dma_addr_t *dma_handle, enum dma_data_direction dir, gfp_t gfp) { const struct dma_map_ops *ops = get_dma_ops(dev); - struct page *page; if (WARN_ON_ONCE(!dev->coherent_dma_mask)) return NULL; @@ -490,31 +489,41 @@ struct page *dma_alloc_pages(struct device *dev, size_t size, size = PAGE_ALIGN(size); if (dma_alloc_direct(dev, ops)) - page = dma_direct_alloc_pages(dev, size, dma_handle, dir, gfp); - else if (ops->alloc_pages) - page = ops->alloc_pages(dev, size, dma_handle, dir, gfp); - else + return dma_direct_alloc_pages(dev, size, dma_handle, dir, gfp); + if (!ops->alloc_pages) return NULL; + return ops->alloc_pages(dev, size, dma_handle, dir, gfp); +} - debug_dma_map_page(dev, page, 0, size, dir, *dma_handle); +struct page *dma_alloc_pages(struct device *dev, size_t size, + dma_addr_t *dma_handle, enum dma_data_direction dir, gfp_t gfp) +{ + struct page *page = __dma_alloc_pages(dev, size, dma_handle, dir, gfp); + if (page) + debug_dma_map_page(dev, page, 0, size, dir, *dma_handle); return page; } EXPORT_SYMBOL_GPL(dma_alloc_pages); -void dma_free_pages(struct device *dev, size_t size, struct page *page, +static void __dma_free_pages(struct device *dev, size_t size, struct page *page, dma_addr_t dma_handle, enum dma_data_direction dir) { const struct dma_map_ops *ops = get_dma_ops(dev); size = PAGE_ALIGN(size); - debug_dma_unmap_page(dev, dma_handle, size, dir); - if (dma_alloc_direct(dev, ops)) dma_direct_free_pages(dev, size, page, dma_handle, dir); else if (ops->free_pages) ops->free_pages(dev, size, page, dma_handle, dir); } + +void dma_free_pages(struct device *dev, size_t size, struct page *page, + dma_addr_t dma_handle, enum dma_data_direction dir) +{ + debug_dma_unmap_page(dev, dma_handle, size, dir); + __dma_free_pages(dev, size, page, dma_handle, dir); +} EXPORT_SYMBOL_GPL(dma_free_pages); int dma_mmap_pages(struct device *dev, struct vm_area_struct *vma, |