From 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 Mon Sep 17 00:00:00 2001 From: Yunhong Jiang Date: Tue, 4 Aug 2015 12:17:53 -0700 Subject: Add the rt linux 4.1.3-rt3 as base Import the rt linux 4.1.3-rt3 as OPNFV kvm base. It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and the base is: commit 0917f823c59692d751951bf5ea699a2d1e2f26a2 Author: Sebastian Andrzej Siewior Date: Sat Jul 25 12:13:34 2015 +0200 Prepare v4.1.3-rt3 Signed-off-by: Sebastian Andrzej Siewior We lose all the git history this way and it's not good. We should apply another opnfv project repo in future. Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423 Signed-off-by: Yunhong Jiang --- kernel/arch/cris/arch-v32/drivers/pci/dma.c | 50 +++++++++++++++++++++++++++++ 1 file changed, 50 insertions(+) create mode 100644 kernel/arch/cris/arch-v32/drivers/pci/dma.c (limited to 'kernel/arch/cris/arch-v32/drivers/pci/dma.c') diff --git a/kernel/arch/cris/arch-v32/drivers/pci/dma.c b/kernel/arch/cris/arch-v32/drivers/pci/dma.c new file mode 100644 index 000000000..ee55578d9 --- /dev/null +++ b/kernel/arch/cris/arch-v32/drivers/pci/dma.c @@ -0,0 +1,50 @@ +/* + * Dynamic DMA mapping support. + * + * On cris there is no hardware dynamic DMA address translation, + * so consistent alloc/free are merely page allocation/freeing. + * The rest of the dynamic DMA mapping interface is implemented + * in asm/pci.h. + * + * Borrowed from i386. + */ + +#include +#include +#include +#include +#include +#include + +void *dma_alloc_coherent(struct device *dev, size_t size, + dma_addr_t *dma_handle, gfp_t gfp) +{ + void *ret; + int order = get_order(size); + /* ignore region specifiers */ + gfp &= ~(__GFP_DMA | __GFP_HIGHMEM); + + if (dma_alloc_from_coherent(dev, size, dma_handle, &ret)) + return ret; + + if (dev == NULL || (dev->coherent_dma_mask < 0xffffffff)) + gfp |= GFP_DMA; + + ret = (void *)__get_free_pages(gfp, order); + + if (ret != NULL) { + memset(ret, 0, size); + *dma_handle = virt_to_phys(ret); + } + return ret; +} + +void dma_free_coherent(struct device *dev, size_t size, + void *vaddr, dma_addr_t dma_handle) +{ + int order = get_order(size); + + if (!dma_release_from_coherent(dev, order, vaddr)) + free_pages((unsigned long)vaddr, order); +} + -- cgit 1.2.3-korg