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authorLinus Torvalds <torvalds@linux-foundation.org>2012-12-17 05:39:14 +0400
committerLinus Torvalds <torvalds@linux-foundation.org>2012-12-17 05:39:14 +0400
commit9b690c3d56ce15dd265b6398f9d8d58c29c17032 (patch)
tree56477d1f4e596011f17d1c64e8597613330e5439 /include
parent36cd5c19c3fe8291fac45a262c44c00bd14b531a (diff)
parentaf51a9f1848ff50079a10def56a2c064f326af22 (diff)
downloadlinux-9b690c3d56ce15dd265b6398f9d8d58c29c17032.tar.xz
Merge tag 'stable/for-linus-3.8-rc0-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/swiotlb
Pull swiotlb update from Konrad Rzeszutek Wilk: "Feature: - Use dma addresses instead of the virt_to_phys and vice versa functions. Remove the multitude of phys_to_virt/virt_to_phys calls and instead operate on the physical addresses instead of virtual in many of the internal functions. This does provide a speed up in interrupt handlers that do DMA operations and use SWIOTLB." * tag 'stable/for-linus-3.8-rc0-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/swiotlb: swiotlb: Do not export swiotlb_bounce since there are no external consumers swiotlb: Use physical addresses instead of virtual in swiotlb_tbl_sync_single swiotlb: Use physical addresses for swiotlb_tbl_unmap_single swiotlb: Return physical addresses when calling swiotlb_tbl_map_single swiotlb: Make io_tlb_overflow_buffer a physical address swiotlb: Make io_tlb_start a physical address instead of a virtual one swiotlb: Make io_tlb_end a physical address instead of a virtual one
Diffstat (limited to 'include')
-rw-r--r--include/linux/swiotlb.h20
1 files changed, 12 insertions, 8 deletions
diff --git a/include/linux/swiotlb.h b/include/linux/swiotlb.h
index 8d08b3ed406d..071d62c214a6 100644
--- a/include/linux/swiotlb.h
+++ b/include/linux/swiotlb.h
@@ -34,21 +34,25 @@ enum dma_sync_target {
SYNC_FOR_CPU = 0,
SYNC_FOR_DEVICE = 1,
};
-extern void *swiotlb_tbl_map_single(struct device *hwdev, dma_addr_t tbl_dma_addr,
- phys_addr_t phys, size_t size,
- enum dma_data_direction dir);
-extern void swiotlb_tbl_unmap_single(struct device *hwdev, char *dma_addr,
+/* define the last possible byte of physical address space as a mapping error */
+#define SWIOTLB_MAP_ERROR (~(phys_addr_t)0x0)
+
+extern phys_addr_t swiotlb_tbl_map_single(struct device *hwdev,
+ dma_addr_t tbl_dma_addr,
+ phys_addr_t phys, size_t size,
+ enum dma_data_direction dir);
+
+extern void swiotlb_tbl_unmap_single(struct device *hwdev,
+ phys_addr_t tlb_addr,
size_t size, enum dma_data_direction dir);
-extern void swiotlb_tbl_sync_single(struct device *hwdev, char *dma_addr,
+extern void swiotlb_tbl_sync_single(struct device *hwdev,
+ phys_addr_t tlb_addr,
size_t size, enum dma_data_direction dir,
enum dma_sync_target target);
/* Accessory functions. */
-extern void swiotlb_bounce(phys_addr_t phys, char *dma_addr, size_t size,
- enum dma_data_direction dir);
-
extern void
*swiotlb_alloc_coherent(struct device *hwdev, size_t size,
dma_addr_t *dma_handle, gfp_t flags);