ia64/linux-2.6.18-xen.hg

view arch/m68knommu/kernel/dma.c @ 912:dd42cdb0ab89

[IA64] Build blktap2 driver by default in x86 builds.

add CONFIG_XEN_BLKDEV_TAP2=y to buildconfigs/linux-defconfig_xen_ia64.

Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>
author Isaku Yamahata <yamahata@valinux.co.jp>
date Mon Jun 29 12:09:16 2009 +0900 (2009-06-29)
parents 831230e53067
children
line source
1 /*
2 * Dynamic DMA mapping support.
3 *
4 * We never have any address translations to worry about, so this
5 * is just alloc/free.
6 */
8 #include <linux/types.h>
9 #include <linux/mm.h>
10 #include <linux/string.h>
11 #include <linux/pci.h>
12 #include <asm/io.h>
14 void *dma_alloc_coherent(struct device *dev, size_t size,
15 dma_addr_t *dma_handle, int gfp)
16 {
17 void *ret;
18 /* ignore region specifiers */
19 gfp &= ~(__GFP_DMA | __GFP_HIGHMEM);
21 if (dev == NULL || (*dev->dma_mask < 0xffffffff))
22 gfp |= GFP_DMA;
23 ret = (void *)__get_free_pages(gfp, get_order(size));
25 if (ret != NULL) {
26 memset(ret, 0, size);
27 *dma_handle = virt_to_phys(ret);
28 }
29 return ret;
30 }
32 void dma_free_coherent(struct device *dev, size_t size,
33 void *vaddr, dma_addr_t dma_handle)
34 {
35 free_pages((unsigned long)vaddr, get_order(size));
36 }