[PATCH v7 05/15] swiotlb: Add a new get_io_tlb_mem getter

Claire Chang
2021-05-18T06:43:17Z

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 <tientzu@chromium.org>
---
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;
--
2.31.1.751.gd2f1c929bd-goog