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Commit 038d07a2 authored by Christoph Hellwig's avatar Christoph Hellwig Committed by Ingo Molnar
Browse files

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: default avatarTom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
Reviewed-by: default avatarThomas Gleixner <tglx@linutronix.de>
Reviewed-by: default avatarKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: David Woodhouse <dwmw2@infradead.org>
Cc: Joerg Roedel <joro@8bytes.org>
Cc: Jon Mason <jdmason@kudzu.us>
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/20180319103826.12853-3-hch@lst.de


Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
parent 3eb93ea3

arch/x86/include/asm/dma-mapping.h

+2 −16
Original line number Diff line number Diff line
@@ -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;

arch/x86/kernel/pci-dma.c

+4 −6
Original line number Diff line number Diff line
@@ -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 @@ void *dma_generic_alloc_coherent(struct device *dev, size_t size, 
						 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 @@ void *dma_generic_alloc_coherent(struct device *dev, size_t size, 
		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;

		}

arch/x86/mm/mem_encrypt.c

+1 −3
Original line number Diff line number Diff line
@@ -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);

drivers/xen/swiotlb-xen.c

+1 −15
Original line number Diff line number Diff line
@@ -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.