From 038d07a283d62336b32cc23b62aecdf9418cfc11 Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Mon, 19 Mar 2018 11:38:14 +0100 Subject: [PATCH] x86/dma: Remove dma_alloc_coherent_mask() These days all devices (including the ISA fallback device) have a coherent DMA mask set, so remove the workaround. Tested-by: Tom Lendacky Signed-off-by: Christoph Hellwig Reviewed-by: Thomas Gleixner Reviewed-by: Konrad Rzeszutek Wilk Cc: David Woodhouse Cc: Joerg Roedel Cc: Jon Mason Cc: Linus Torvalds Cc: Muli Ben-Yehuda Cc: Peter Zijlstra Cc: iommu@lists.linux-foundation.org Link: http://lkml.kernel.org/r/20180319103826.12853-3-hch@lst.de Signed-off-by: Ingo Molnar --- arch/x86/include/asm/dma-mapping.h | 18 ++---------------- arch/x86/kernel/pci-dma.c | 10 ++++------ arch/x86/mm/mem_encrypt.c | 4 +--- drivers/xen/swiotlb-xen.c | 16 +--------------- 4 files changed, 8 insertions(+), 40 deletions(-) diff --git a/arch/x86/include/asm/dma-mapping.h b/arch/x86/include/asm/dma-mapping.h index 6277c83..545bf372 100644 --- a/arch/x86/include/asm/dma-mapping.h +++ b/arch/x86/include/asm/dma-mapping.h @@ -44,26 +44,12 @@ extern void dma_generic_free_coherent(struct device *dev, size_t size, void *vaddr, dma_addr_t dma_addr, unsigned long attrs); -static inline unsigned long dma_alloc_coherent_mask(struct device *dev, - gfp_t gfp) -{ - unsigned long dma_mask = 0; - - dma_mask = dev->coherent_dma_mask; - if (!dma_mask) - dma_mask = (gfp & GFP_DMA) ? DMA_BIT_MASK(24) : DMA_BIT_MASK(32); - - return dma_mask; -} - static inline gfp_t dma_alloc_coherent_gfp_flags(struct device *dev, gfp_t gfp) { - unsigned long dma_mask = dma_alloc_coherent_mask(dev, gfp); - - if (dma_mask <= DMA_BIT_MASK(24)) + if (dev->coherent_dma_mask <= DMA_BIT_MASK(24)) gfp |= GFP_DMA; #ifdef CONFIG_X86_64 - if (dma_mask <= DMA_BIT_MASK(32) && !(gfp & GFP_DMA)) + if (dev->coherent_dma_mask <= DMA_BIT_MASK(32) && !(gfp & GFP_DMA)) gfp |= GFP_DMA32; #endif return gfp; diff --git a/arch/x86/kernel/pci-dma.c b/arch/x86/kernel/pci-dma.c index df7ab02..b598208 100644 --- a/arch/x86/kernel/pci-dma.c +++ b/arch/x86/kernel/pci-dma.c @@ -80,13 +80,10 @@ void *dma_generic_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_addr, gfp_t flag, unsigned long attrs) { - unsigned long dma_mask; struct page *page; unsigned int count = PAGE_ALIGN(size) >> PAGE_SHIFT; dma_addr_t addr; - dma_mask = dma_alloc_coherent_mask(dev, flag); - again: page = NULL; /* CMA can be used only in the context which permits sleeping */ @@ -95,7 +92,7 @@ again: flag); if (page) { addr = phys_to_dma(dev, page_to_phys(page)); - if (addr + size > dma_mask) { + if (addr + size > dev->coherent_dma_mask) { dma_release_from_contiguous(dev, page, count); page = NULL; } @@ -108,10 +105,11 @@ again: return NULL; addr = phys_to_dma(dev, page_to_phys(page)); - if (addr + size > dma_mask) { + if (addr + size > dev->coherent_dma_mask) { __free_pages(page, get_order(size)); - if (dma_mask < DMA_BIT_MASK(32) && !(flag & GFP_DMA)) { + if (dev->coherent_dma_mask < DMA_BIT_MASK(32) && + !(flag & GFP_DMA)) { flag = (flag & ~GFP_DMA32) | GFP_DMA; goto again; } diff --git a/arch/x86/mm/mem_encrypt.c b/arch/x86/mm/mem_encrypt.c index 3a1b5fe..f6cd84b 100644 --- a/arch/x86/mm/mem_encrypt.c +++ b/arch/x86/mm/mem_encrypt.c @@ -198,12 +198,10 @@ void __init sme_early_init(void) static void *sev_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle, gfp_t gfp, unsigned long attrs) { - unsigned long dma_mask; unsigned int order; struct page *page; void *vaddr = NULL; - dma_mask = dma_alloc_coherent_mask(dev, gfp); order = get_order(size); /* @@ -221,7 +219,7 @@ static void *sev_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle, * mask with it already cleared. */ addr = __sme_clr(phys_to_dma(dev, page_to_phys(page))); - if ((addr + size) > dma_mask) { + if ((addr + size) > dev->coherent_dma_mask) { __free_pages(page, get_order(size)); } else { vaddr = page_address(page); diff --git a/drivers/xen/swiotlb-xen.c b/drivers/xen/swiotlb-xen.c index 5bb72d3..e1c6089 100644 --- a/drivers/xen/swiotlb-xen.c +++ b/drivers/xen/swiotlb-xen.c @@ -53,20 +53,6 @@ * API. */ -#ifndef CONFIG_X86 -static unsigned long dma_alloc_coherent_mask(struct device *dev, - gfp_t gfp) -{ - unsigned long dma_mask = 0; - - dma_mask = dev->coherent_dma_mask; - if (!dma_mask) - dma_mask = (gfp & GFP_DMA) ? DMA_BIT_MASK(24) : DMA_BIT_MASK(32); - - return dma_mask; -} -#endif - #define XEN_SWIOTLB_ERROR_CODE (~(dma_addr_t)0x0) static char *xen_io_tlb_start, *xen_io_tlb_end; @@ -328,7 +314,7 @@ xen_swiotlb_alloc_coherent(struct device *hwdev, size_t size, return ret; if (hwdev && hwdev->coherent_dma_mask) - dma_mask = dma_alloc_coherent_mask(hwdev, flags); + dma_mask = hwdev->coherent_dma_mask; /* At this point dma_handle is the physical address, next we are * going to set it to the machine address. -- 2.7.4