diff options
| author | Christoph Hellwig <hch@lst.de> | 2018-12-06 12:25:54 -0800 |
|---|---|---|
| committer | Christoph Hellwig <hch@lst.de> | 2018-12-13 21:06:09 +0100 |
| commit | 05887cb610a54bf568de7f0bc07c4a64e45ac6f9 (patch) | |
| tree | 8850d8c8140123823a2dd6e373accf85b17313a0 /kernel/dma/mapping.c | |
| parent | 7f0fee242e899f2eb42fd9e72bcfc3cb59aad1ce (diff) | |
dma-mapping: move dma_get_required_mask to kernel/dma
dma_get_required_mask should really be with the rest of the DMA mapping
implementation instead of in drivers/base as a lone outlier.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Jesper Dangaard Brouer <brouer@redhat.com>
Tested-by: Jesper Dangaard Brouer <brouer@redhat.com>
Tested-by: Tony Luck <tony.luck@intel.com>
Diffstat (limited to 'kernel/dma/mapping.c')
| -rw-r--r-- | kernel/dma/mapping.c | 34 |
1 files changed, 33 insertions, 1 deletions
diff --git a/kernel/dma/mapping.c b/kernel/dma/mapping.c index dfbc3deb95cd..dfe29d18dba1 100644 --- a/kernel/dma/mapping.c +++ b/kernel/dma/mapping.c @@ -5,7 +5,7 @@ * Copyright (c) 2006 SUSE Linux Products GmbH * Copyright (c) 2006 Tejun Heo <teheo@suse.de> */ - +#include <linux/memblock.h> /* for max_pfn */ #include <linux/acpi.h> #include <linux/dma-noncoherent.h> #include <linux/export.h> @@ -262,3 +262,35 @@ int dma_common_mmap(struct device *dev, struct vm_area_struct *vma, #endif /* !CONFIG_ARCH_NO_COHERENT_DMA_MMAP */ } EXPORT_SYMBOL(dma_common_mmap); + +#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); + u32 high_totalram = ((max_pfn - 1) >> (32 - PAGE_SHIFT)); + u64 mask; + + if (!high_totalram) { + /* convert to mask just covering totalram */ + low_totalram = (1 << (fls(low_totalram) - 1)); + low_totalram += low_totalram - 1; + mask = low_totalram; + } else { + high_totalram = (1 << (fls(high_totalram) - 1)); + high_totalram += high_totalram - 1; + mask = (((u64)high_totalram) << 32) + 0xffffffff; + } + return mask; +} + +u64 dma_get_required_mask(struct device *dev) +{ + const struct dma_map_ops *ops = get_dma_ops(dev); + + if (ops->get_required_mask) + return ops->get_required_mask(dev); + return dma_default_get_required_mask(dev); +} +EXPORT_SYMBOL_GPL(dma_get_required_mask); +#endif + |