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x86/PCI: Adjust GFP mask handling for coherent allocations
Rather than forcing GFP flags and DMA mask to be inconsistent, GFP flags should be determined even for the fallback device through dma_alloc_coherent_mask()/dma_alloc_coherent_gfp_flags(). This restores 64-bit behavior as it was prior to commits8965eb1938
and4a367f3a9d
(not sure why there are two of them), where GFP_DMA was forced on for 32-bit, but not for 64-bit, with the slight adjustment that afaict even 32-bit doesn't need this without CONFIG_ISA. Signed-off-by: Jan Beulich <jbeulich@novell.com> Acked-by: Takashi Iwai <tiwai@suse.de> LKML-Reference: <4AF18187020000780001D8AA@vpn.id2.novell.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
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parent
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commit
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2 changed files with 9 additions and 7 deletions
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@ -14,6 +14,12 @@
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#include <asm/swiotlb.h>
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#include <asm-generic/dma-coherent.h>
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#ifdef CONFIG_ISA
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# define ISA_DMA_BIT_MASK DMA_BIT_MASK(24)
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#else
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# define ISA_DMA_BIT_MASK DMA_BIT_MASK(32)
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#endif
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extern dma_addr_t bad_dma_address;
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extern int iommu_merge;
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extern struct device x86_dma_fallback_dev;
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@ -124,10 +130,8 @@ dma_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_handle,
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if (dma_alloc_from_coherent(dev, size, dma_handle, &memory))
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return memory;
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if (!dev) {
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if (!dev)
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dev = &x86_dma_fallback_dev;
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gfp |= GFP_DMA;
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}
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if (!is_device_dma_capable(dev))
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return NULL;
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@ -45,12 +45,10 @@ int iommu_pass_through __read_mostly;
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dma_addr_t bad_dma_address __read_mostly = 0;
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EXPORT_SYMBOL(bad_dma_address);
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/* Dummy device used for NULL arguments (normally ISA). Better would
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be probably a smaller DMA mask, but this is bug-to-bug compatible
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to older i386. */
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/* Dummy device used for NULL arguments (normally ISA). */
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struct device x86_dma_fallback_dev = {
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.init_name = "fallback device",
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.coherent_dma_mask = DMA_BIT_MASK(32),
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.coherent_dma_mask = ISA_DMA_BIT_MASK,
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.dma_mask = &x86_dma_fallback_dev.coherent_dma_mask,
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};
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EXPORT_SYMBOL(x86_dma_fallback_dev);
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