[PATCH 39/67] iommu/amd_iommu: use dma_direct_* helpers for the direct mapping case
From: Christoph Hellwig <hch@lst.de>
Date: 2017-12-29 08:22:30
Also in:
linux-arch, linux-arm-kernel, linux-iommu, linux-mips, linux-s390, linux-sh, linuxppc-dev, lkml, sparclinux
Subsystem:
iommu subsystem, the rest · Maintainers:
Joerg Roedel, Will Deacon, Linus Torvalds
This adds support for CMA allocations, but is otherwise identical. Signed-off-by: Christoph Hellwig <hch@lst.de> --- drivers/iommu/Kconfig | 1 + drivers/iommu/amd_iommu.c | 27 +++++++++------------------ 2 files changed, 10 insertions(+), 18 deletions(-)
diff --git a/drivers/iommu/Kconfig b/drivers/iommu/Kconfig
index f3a21343e636..dc7c1914645d 100644
--- a/drivers/iommu/Kconfig
+++ b/drivers/iommu/Kconfig@@ -107,6 +107,7 @@ config IOMMU_PGTABLES_L2 # AMD IOMMU support config AMD_IOMMU bool "AMD IOMMU support" + select DMA_DIRECT_OPS select SWIOTLB select PCI_MSI select PCI_ATS
diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
index ea4734de5357..a2ad149ab0bf 100644
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c@@ -2592,11 +2592,9 @@ static void *alloc_coherent(struct device *dev, size_t size, struct page *page; domain = get_domain(dev); - if (PTR_ERR(domain) == -EINVAL) { - page = alloc_pages(flag, get_order(size)); - *dma_addr = page_to_phys(page); - return page_address(page); - } else if (IS_ERR(domain)) + if (PTR_ERR(domain) == -EINVAL) + return dma_direct_alloc(dev, size, dma_addr, flag, attrs); + else if (IS_ERR(domain)) return NULL; dma_dom = to_dma_ops_domain(domain);
@@ -2642,24 +2640,17 @@ static void free_coherent(struct device *dev, size_t size, void *virt_addr, dma_addr_t dma_addr, unsigned long attrs) { - struct protection_domain *domain; - struct dma_ops_domain *dma_dom; - struct page *page; + struct protection_domain *domain = get_domain(dev); - page = virt_to_page(virt_addr); size = PAGE_ALIGN(size); - domain = get_domain(dev); - if (IS_ERR(domain)) - goto free_mem; - - dma_dom = to_dma_ops_domain(domain); + if (!IS_ERR(domain)) { + struct dma_ops_domain *dma_dom = to_dma_ops_domain(domain); - __unmap_single(dma_dom, dma_addr, size, DMA_BIDIRECTIONAL); + __unmap_single(dma_dom, dma_addr, size, DMA_BIDIRECTIONAL); + } -free_mem: - if (!dma_release_from_contiguous(dev, page, size >> PAGE_SHIFT)) - __free_pages(page, get_order(size)); + dma_direct_free(dev, size, virt_addr, dma_addr, attrs); } /*
--
2.14.2