x86/dma: Remove dma_alloc_coherent_gfp_flags()

All dma_ops implementations used on x86 now take care of setting their own
required GFP_ masks for the allocation.  And given that the common code
now clears harmful flags itself that means we can stop the flags in all
the IOMMU implementations as well.

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/20180319103826.12853-10-hch@lst.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>

4 files changed, 0 insertions, 22 deletions

diff --git a/arch/x86/include/asm/dma-mapping.h b/arch/x86/include/asm/dma-mapping.h
index df9816b..89ce4bf 100644
--- a/arch/x86/include/asm/dma-mapping.h
+++ b/arch/x86/include/asm/dma-mapping.h
@@ -36,15 +36,4 @@ int arch_dma_supported(struct device *dev, u64 mask);
 bool arch_dma_alloc_attrs(struct device **dev, gfp_t *gfp);
 #define arch_dma_alloc_attrs arch_dma_alloc_attrs
 
-static inline gfp_t dma_alloc_coherent_gfp_flags(struct device *dev, gfp_t gfp)
-{
-	if (dev->coherent_dma_mask <= DMA_BIT_MASK(24))
-		gfp |= GFP_DMA;
-#ifdef CONFIG_X86_64
-	if (dev->coherent_dma_mask <= DMA_BIT_MASK(32) && !(gfp & GFP_DMA))
-		gfp |= GFP_DMA32;
-#endif
-       return gfp;
-}
-
 #endif
diff --git a/arch/x86/kernel/pci-calgary_64.c b/arch/x86/kernel/pci-calgary_64.c
index 5647853..bbfc8b1 100644
--- a/arch/x86/kernel/pci-calgary_64.c
+++ b/arch/x86/kernel/pci-calgary_64.c
@@ -446,8 +446,6 @@ static void* calgary_alloc_coherent(struct device *dev, size_t size,
 	npages = size >> PAGE_SHIFT;
 	order = get_order(size);
 
-	flag &= ~(__GFP_DMA | __GFP_HIGHMEM | __GFP_DMA32);
-
 	/* alloc enough pages (and possibly more) */
 	ret = (void *)__get_free_pages(flag, order);
 	if (!ret)
diff --git a/arch/x86/kernel/pci-dma.c b/arch/x86/kernel/pci-dma.c
index db0b88e..1443711 100644
--- a/arch/x86/kernel/pci-dma.c
+++ b/arch/x86/kernel/pci-dma.c
@@ -82,8 +82,6 @@ bool arch_dma_alloc_attrs(struct device **dev, gfp_t *gfp)
 	if (!*dev)
 		*dev = &x86_dma_fallback_dev;
 
-	*gfp = dma_alloc_coherent_gfp_flags(*dev, *gfp);
-
 	if (!is_device_dma_capable(*dev))
 		return false;
 	return true;
diff --git a/arch/x86/mm/mem_encrypt.c b/arch/x86/mm/mem_encrypt.c
index f6cd84b..1217a4f 100644
--- a/arch/x86/mm/mem_encrypt.c
+++ b/arch/x86/mm/mem_encrypt.c
@@ -203,13 +203,6 @@ static void *sev_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle,
 	void *vaddr = NULL;
 
 	order = get_order(size);
-
-	/*
-	 * Memory will be memset to zero after marking decrypted, so don't
-	 * bother clearing it before.
-	 */
-	gfp &= ~__GFP_ZERO;
-
 	page = alloc_pages_node(dev_to_node(dev), gfp, order);
 	if (page) {
 		dma_addr_t addr;