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Merge branch 'topic/dma' into next

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Merge hch's big DMA rework series. This is in a topic branch in case he
wants to merge it to minimise conflicts.
This commit is contained in:
Michael Ellerman
2019-02-21 23:15:10 +11:00
parent 637cfeb9f9 4a605e2d1a
commit d0055df0c9
48 changed files with 318 additions and 1159 deletions
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3
kernel/dma/Kconfig
View File

@@ -16,6 +16,9 @@ config ARCH_DMA_ADDR_T_64BIT
config ARCH_HAS_DMA_COHERENCE_H
bool
config ARCH_HAS_DMA_SET_MASK
bool
config HAVE_GENERIC_DMA_COHERENT
bool

3
kernel/dma/direct.c
View File

@@ -132,8 +132,7 @@ again:
goto again;
}
if (IS_ENABLED(CONFIG_ZONE_DMA) &&
phys_mask < DMA_BIT_MASK(32) && !(gfp & GFP_DMA)) {
if (IS_ENABLED(CONFIG_ZONE_DMA) && !(gfp & GFP_DMA)) {
gfp = (gfp & ~GFP_DMA32) | GFP_DMA;
goto again;
}

11
kernel/dma/mapping.c
View File

@@ -207,7 +207,6 @@ int dma_mmap_attrs(struct device *dev, struct vm_area_struct *vma,
}
EXPORT_SYMBOL(dma_mmap_attrs);
#ifndef ARCH_HAS_DMA_GET_REQUIRED_MASK
static u64 dma_default_get_required_mask(struct device *dev)
{
u32 low_totalram = ((max_pfn - 1) << PAGE_SHIFT);
@@ -238,7 +237,6 @@ u64 dma_get_required_mask(struct device *dev)
return dma_default_get_required_mask(dev);
}
EXPORT_SYMBOL_GPL(dma_get_required_mask);
#endif
#ifndef arch_dma_alloc_attrs
#define arch_dma_alloc_attrs(dev) (true)
@@ -318,18 +316,23 @@ int dma_supported(struct device *dev, u64 mask)
}
EXPORT_SYMBOL(dma_supported);
#ifndef HAVE_ARCH_DMA_SET_MASK
#ifdef CONFIG_ARCH_HAS_DMA_SET_MASK
void arch_dma_set_mask(struct device *dev, u64 mask);
#else
#define arch_dma_set_mask(dev, mask) do { } while (0)
#endif
int dma_set_mask(struct device *dev, u64 mask)
{
if (!dev->dma_mask || !dma_supported(dev, mask))
return -EIO;
arch_dma_set_mask(dev, mask);
dma_check_mask(dev, mask);
*dev->dma_mask = mask;
return 0;
}
EXPORT_SYMBOL(dma_set_mask);
#endif
#ifndef CONFIG_ARCH_HAS_DMA_SET_COHERENT_MASK
int dma_set_coherent_mask(struct device *dev, u64 mask)

12
kernel/dma/swiotlb.c
View File

@@ -648,15 +648,3 @@ bool swiotlb_map(struct device *dev, phys_addr_t *phys, dma_addr_t *dma_addr,
return true;
}
/*
* Return whether the given device DMA address mask can be supported
* properly. For example, if your device can only drive the low 24-bits
* during bus mastering, then you would pass 0x00ffffff as the mask to
* this function.
*/
int
swiotlb_dma_supported(struct device *hwdev, u64 mask)
{
return __phys_to_dma(hwdev, io_tlb_end - 1) <= mask;
}