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authorChristoph Hellwig <hch@lst.de>2018-03-19 11:38:15 +0100
committerIngo Molnar <mingo@kernel.org>2018-03-20 10:01:56 +0100
commitfec777c385b6376048fc4b08f039366545b335cd (patch)
treea613e68a5746d74d69bf3aa06818b05119d8e500 /arch/x86/kernel/pci-dma.c
parent038d07a283d62336b32cc23b62aecdf9418cfc11 (diff)
downloadlinux-fec777c385b6376048fc4b08f039366545b335cd.tar.bz2
x86/dma: Use DMA-direct (CONFIG_DMA_DIRECT_OPS=y)
The generic DMA-direct (CONFIG_DMA_DIRECT_OPS=y) implementation is now functionally equivalent to the x86 nommu dma_map implementation, so switch over to using it. That includes switching from using x86_dma_supported in various IOMMU drivers to use dma_direct_supported instead, which provides the same functionality. Tested-by: Tom Lendacky <thomas.lendacky@amd.com> Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Thomas Gleixner <tglx@linutronix.de> Cc: David Woodhouse <dwmw2@infradead.org> Cc: Joerg Roedel <joro@8bytes.org> Cc: Jon Mason <jdmason@kudzu.us> Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Muli Ben-Yehuda <mulix@mulix.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: iommu@lists.linux-foundation.org Link: http://lkml.kernel.org/r/20180319103826.12853-4-hch@lst.de Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/x86/kernel/pci-dma.c')
-rw-r--r--arch/x86/kernel/pci-dma.c66
1 files changed, 1 insertions, 65 deletions
diff --git a/arch/x86/kernel/pci-dma.c b/arch/x86/kernel/pci-dma.c
index b59820872ec7..db0b88ea8d1b 100644
--- a/arch/x86/kernel/pci-dma.c
+++ b/arch/x86/kernel/pci-dma.c
@@ -18,7 +18,7 @@
static int forbid_dac __read_mostly;
-const struct dma_map_ops *dma_ops = &nommu_dma_ops;
+const struct dma_map_ops *dma_ops = &dma_direct_ops;
EXPORT_SYMBOL(dma_ops);
static int iommu_sac_force __read_mostly;
@@ -76,60 +76,6 @@ void __init pci_iommu_alloc(void)
}
}
}
-void *dma_generic_alloc_coherent(struct device *dev, size_t size,
- dma_addr_t *dma_addr, gfp_t flag,
- unsigned long attrs)
-{
- struct page *page;
- unsigned int count = PAGE_ALIGN(size) >> PAGE_SHIFT;
- dma_addr_t addr;
-
-again:
- page = NULL;
- /* CMA can be used only in the context which permits sleeping */
- if (gfpflags_allow_blocking(flag)) {
- page = dma_alloc_from_contiguous(dev, count, get_order(size),
- flag);
- if (page) {
- addr = phys_to_dma(dev, page_to_phys(page));
- if (addr + size > dev->coherent_dma_mask) {
- dma_release_from_contiguous(dev, page, count);
- page = NULL;
- }
- }
- }
- /* fallback */
- if (!page)
- page = alloc_pages_node(dev_to_node(dev), flag, get_order(size));
- if (!page)
- return NULL;
-
- addr = phys_to_dma(dev, page_to_phys(page));
- if (addr + size > dev->coherent_dma_mask) {
- __free_pages(page, get_order(size));
-
- if (dev->coherent_dma_mask < DMA_BIT_MASK(32) &&
- !(flag & GFP_DMA)) {
- flag = (flag & ~GFP_DMA32) | GFP_DMA;
- goto again;
- }
-
- return NULL;
- }
- memset(page_address(page), 0, size);
- *dma_addr = addr;
- return page_address(page);
-}
-
-void dma_generic_free_coherent(struct device *dev, size_t size, void *vaddr,
- dma_addr_t dma_addr, unsigned long attrs)
-{
- unsigned int count = PAGE_ALIGN(size) >> PAGE_SHIFT;
- struct page *page = virt_to_page(vaddr);
-
- if (!dma_release_from_contiguous(dev, page, count))
- free_pages((unsigned long)vaddr, get_order(size));
-}
bool arch_dma_alloc_attrs(struct device **dev, gfp_t *gfp)
{
@@ -243,16 +189,6 @@ int arch_dma_supported(struct device *dev, u64 mask)
}
EXPORT_SYMBOL(arch_dma_supported);
-int x86_dma_supported(struct device *dev, u64 mask)
-{
- /* Copied from i386. Doesn't make much sense, because it will
- only work for pci_alloc_coherent.
- The caller just has to use GFP_DMA in this case. */
- if (mask < DMA_BIT_MASK(24))
- return 0;
- return 1;
-}
-
static int __init pci_iommu_init(void)
{
struct iommu_table_entry *p;