5299709d0a
Most dma_map_ops structures are never modified. Constify these
structures such that these can be write-protected. This patch
has been generated as follows:
git grep -l 'struct dma_map_ops' |
xargs -d\\n sed -i \
-e 's/struct dma_map_ops/const struct dma_map_ops/g' \
-e 's/const struct dma_map_ops {/struct dma_map_ops {/g' \
-e 's/^const struct dma_map_ops;$/struct dma_map_ops;/' \
-e 's/const const struct dma_map_ops /const struct dma_map_ops /g';
sed -i -e 's/const \(struct dma_map_ops intel_dma_ops\)/\1/' \
$(git grep -l 'struct dma_map_ops intel_dma_ops');
sed -i -e 's/const \(struct dma_map_ops dma_iommu_ops\)/\1/' \
$(git grep -l 'struct dma_map_ops' | grep ^arch/powerpc);
sed -i -e '/^struct vmd_dev {$/,/^};$/ s/const \(struct dma_map_ops[[:blank:]]dma_ops;\)/\1/' \
-e '/^static void vmd_setup_dma_ops/,/^}$/ s/const \(struct dma_map_ops \*dest\)/\1/' \
-e 's/const \(struct dma_map_ops \*dest = \&vmd->dma_ops\)/\1/' \
drivers/pci/host/*.c
sed -i -e '/^void __init pci_iommu_alloc(void)$/,/^}$/ s/dma_ops->/intel_dma_ops./' arch/ia64/kernel/pci-dma.c
sed -i -e 's/static const struct dma_map_ops sn_dma_ops/static struct dma_map_ops sn_dma_ops/' arch/ia64/sn/pci/pci_dma.c
sed -i -e 's/(const struct dma_map_ops \*)//' drivers/misc/mic/bus/vop_bus.c
Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Cc: David Woodhouse <dwmw2@infradead.org>
Cc: Juergen Gross <jgross@suse.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: linux-arch@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: Russell King <linux@armlinux.org.uk>
Cc: x86@kernel.org
Signed-off-by: Doug Ledford <dledford@redhat.com>
60 lines
1.8 KiB
C
60 lines
1.8 KiB
C
/*
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* Copyright (c) 2004 Hewlett-Packard Development Company, L.P.
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* Contributed by David Mosberger-Tang <davidm@hpl.hp.com>
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*
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* This is a pseudo I/O MMU which dispatches to the hardware I/O MMU
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* whenever possible. We assume that the hardware I/O MMU requires
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* full 32-bit addressability, as is the case, e.g., for HP zx1-based
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* systems (there, the I/O MMU window is mapped at 3-4GB). If a
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* device doesn't provide full 32-bit addressability, we fall back on
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* the sw I/O TLB. This is good enough to let us support broken
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* hardware such as soundcards which have a DMA engine that can
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* address only 28 bits.
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*/
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#include <linux/device.h>
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#include <linux/dma-mapping.h>
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#include <linux/swiotlb.h>
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#include <linux/export.h>
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#include <asm/machvec.h>
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extern const struct dma_map_ops sba_dma_ops, swiotlb_dma_ops;
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/* swiotlb declarations & definitions: */
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extern int swiotlb_late_init_with_default_size (size_t size);
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/*
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* Note: we need to make the determination of whether or not to use
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* the sw I/O TLB based purely on the device structure. Anything else
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* would be unreliable or would be too intrusive.
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*/
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static inline int use_swiotlb(struct device *dev)
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{
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return dev && dev->dma_mask &&
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!sba_dma_ops.dma_supported(dev, *dev->dma_mask);
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}
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const struct dma_map_ops *hwsw_dma_get_ops(struct device *dev)
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{
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if (use_swiotlb(dev))
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return &swiotlb_dma_ops;
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return &sba_dma_ops;
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}
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EXPORT_SYMBOL(hwsw_dma_get_ops);
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void __init
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hwsw_init (void)
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{
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/* default to a smallish 2MB sw I/O TLB */
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if (swiotlb_late_init_with_default_size (2 * (1<<20)) != 0) {
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#ifdef CONFIG_IA64_GENERIC
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/* Better to have normal DMA than panic */
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printk(KERN_WARNING "%s: Failed to initialize software I/O TLB,"
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" reverting to hpzx1 platform vector\n", __func__);
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machvec_init("hpzx1");
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#else
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panic("Unable to initialize software I/O TLB services");
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#endif
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}
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}
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