[PATCH v6 05/15] swiotlb: Add a new get_io_tlb_mem getter
From: Claire Chang <hidden>
Date: 2021-05-10 09:53:53
Also in:
dri-devel, intel-gfx, linux-devicetree, linux-iommu, linux-pci, lkml, nouveau, xen-devel
Subsystem:
dma mapping helpers, the rest · Maintainers:
Marek Szyprowski, Linus Torvalds
Add a new getter, get_io_tlb_mem, to help select the io_tlb_mem struct. The restricted DMA pool is preferred if available. Signed-off-by: Claire Chang <redacted> --- include/linux/swiotlb.h | 11 +++++++++++ 1 file changed, 11 insertions(+)
diff --git a/include/linux/swiotlb.h b/include/linux/swiotlb.h
index 03ad6e3b4056..b469f04cca26 100644
--- a/include/linux/swiotlb.h
+++ b/include/linux/swiotlb.h@@ -2,6 +2,7 @@ #ifndef __LINUX_SWIOTLB_H #define __LINUX_SWIOTLB_H +#include <linux/device.h> #include <linux/dma-direction.h> #include <linux/init.h> #include <linux/types.h>
@@ -102,6 +103,16 @@ struct io_tlb_mem { }; extern struct io_tlb_mem *io_tlb_default_mem; +static inline struct io_tlb_mem *get_io_tlb_mem(struct device *dev) +{ +#ifdef CONFIG_DMA_RESTRICTED_POOL + if (dev && dev->dma_io_tlb_mem) + return dev->dma_io_tlb_mem; +#endif /* CONFIG_DMA_RESTRICTED_POOL */ + + return io_tlb_default_mem; +} + static inline bool is_swiotlb_buffer(phys_addr_t paddr) { struct io_tlb_mem *mem = io_tlb_default_mem;
--
2.31.1.607.g51e8a6a459-goog