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author | Christoph Hellwig <hch@lst.de> | 2018-03-19 11:38:19 +0100 |
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committer | Ingo Molnar <mingo@kernel.org> | 2018-03-20 10:01:58 +0100 |
commit | b468620f2a1dfdcfddfd6fa54367b8bcc1b51248 (patch) | |
tree | 3fbf0c6ffaee52b0be8dea00afbc5c43b1b7a259 /drivers/iommu | |
parent | 51c7eeba7975c1d2a02eefd00ece6de25176f5f3 (diff) | |
download | linux-b468620f2a1dfdcfddfd6fa54367b8bcc1b51248.tar.gz linux-b468620f2a1dfdcfddfd6fa54367b8bcc1b51248.tar.bz2 linux-b468620f2a1dfdcfddfd6fa54367b8bcc1b51248.zip |
iommu/amd_iommu: Use CONFIG_DMA_DIRECT_OPS=y and dma_direct_{alloc,free}()
This cleans up the code a lot by removing duplicate logic.
Tested-by: Tom Lendacky <thomas.lendacky@amd.com>
Tested-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Joerg Roedel <jroedel@suse.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/20180319103826.12853-8-hch@lst.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'drivers/iommu')
-rw-r--r-- | drivers/iommu/Kconfig | 1 | ||||
-rw-r--r-- | drivers/iommu/amd_iommu.c | 68 |
2 files changed, 22 insertions, 47 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 0bf19423b588..83819d0cbf90 100644 --- a/drivers/iommu/amd_iommu.c +++ b/drivers/iommu/amd_iommu.c @@ -2600,51 +2600,32 @@ static void *alloc_coherent(struct device *dev, size_t size, unsigned long attrs) { u64 dma_mask = dev->coherent_dma_mask; - struct protection_domain *domain; - struct dma_ops_domain *dma_dom; - 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)) - return NULL; + struct protection_domain *domain = get_domain(dev); + bool is_direct = false; + void *virt_addr; - dma_dom = to_dma_ops_domain(domain); - size = PAGE_ALIGN(size); - dma_mask = dev->coherent_dma_mask; - flag &= ~(__GFP_DMA | __GFP_HIGHMEM | __GFP_DMA32); - flag |= __GFP_ZERO; - - page = alloc_pages(flag | __GFP_NOWARN, get_order(size)); - if (!page) { - if (!gfpflags_allow_blocking(flag)) - return NULL; - - page = dma_alloc_from_contiguous(dev, size >> PAGE_SHIFT, - get_order(size), flag); - if (!page) + if (IS_ERR(domain)) { + if (PTR_ERR(domain) != -EINVAL) return NULL; + is_direct = true; } + virt_addr = dma_direct_alloc(dev, size, dma_addr, flag, attrs); + if (!virt_addr || is_direct) + return virt_addr; + if (!dma_mask) dma_mask = *dev->dma_mask; - *dma_addr = __map_single(dev, dma_dom, page_to_phys(page), - size, DMA_BIDIRECTIONAL, dma_mask); - + *dma_addr = __map_single(dev, to_dma_ops_domain(domain), + virt_to_phys(virt_addr), PAGE_ALIGN(size), + DMA_BIDIRECTIONAL, dma_mask); if (*dma_addr == AMD_IOMMU_MAPPING_ERROR) goto out_free; - - return page_address(page); + return virt_addr; out_free: - - 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); return NULL; } @@ -2655,24 +2636,17 @@ 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; + if (!IS_ERR(domain)) { + struct dma_ops_domain *dma_dom = to_dma_ops_domain(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); } /* |