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| author | Stefano Stabellini <stefano.stabellini@eu.citrix.com> | 2013-10-09 16:56:32 +0000 |
|---|---|---|
| committer | Stefano Stabellini <stefano.stabellini@eu.citrix.com> | 2013-10-09 16:56:32 +0000 |
| commit | 69908907b02efee31377af0cefbcd5a3ba66334a (patch) | |
| tree | 7348359ef60c91ca9edfd71680a858f28a7d156e | |
| parent | 2f558d40911c1b8f929b8a382833ae1da5df3293 (diff) | |
| download | op-kernel-dev-69908907b02efee31377af0cefbcd5a3ba66334a.zip op-kernel-dev-69908907b02efee31377af0cefbcd5a3ba66334a.tar.gz | |
xen: make xen_create_contiguous_region return the dma address
Modify xen_create_contiguous_region to return the dma address of the
newly contiguous buffer.
Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Acked-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Reviewed-by: David Vrabel <david.vrabel@citrix.com>
Changes in v4:
- use virt_to_machine instead of virt_to_bus.
| -rw-r--r-- | arch/x86/xen/mmu.c | 4 | ||||
| -rw-r--r-- | drivers/xen/swiotlb-xen.c | 6 | ||||
| -rw-r--r-- | include/xen/xen-ops.h | 3 |
3 files changed, 8 insertions, 5 deletions
diff --git a/arch/x86/xen/mmu.c b/arch/x86/xen/mmu.c index fdc3ba2..6c34d7c 100644 --- a/arch/x86/xen/mmu.c +++ b/arch/x86/xen/mmu.c @@ -2329,7 +2329,8 @@ static int xen_exchange_memory(unsigned long extents_in, unsigned int order_in, } int xen_create_contiguous_region(unsigned long vstart, unsigned int order, - unsigned int address_bits) + unsigned int address_bits, + dma_addr_t *dma_handle) { unsigned long *in_frames = discontig_frames, out_frame; unsigned long flags; @@ -2368,6 +2369,7 @@ int xen_create_contiguous_region(unsigned long vstart, unsigned int order, spin_unlock_irqrestore(&xen_reservation_lock, flags); + *dma_handle = virt_to_machine(vstart).maddr; return success ? 0 : -ENOMEM; } EXPORT_SYMBOL_GPL(xen_create_contiguous_region); diff --git a/drivers/xen/swiotlb-xen.c b/drivers/xen/swiotlb-xen.c index 1b2277c..b72f31c 100644 --- a/drivers/xen/swiotlb-xen.c +++ b/drivers/xen/swiotlb-xen.c @@ -126,6 +126,7 @@ xen_swiotlb_fixup(void *buf, size_t size, unsigned long nslabs) { int i, rc; int dma_bits; + dma_addr_t dma_handle; dma_bits = get_order(IO_TLB_SEGSIZE << IO_TLB_SHIFT) + PAGE_SHIFT; @@ -137,7 +138,7 @@ xen_swiotlb_fixup(void *buf, size_t size, unsigned long nslabs) rc = xen_create_contiguous_region( (unsigned long)buf + (i << IO_TLB_SHIFT), get_order(slabs << IO_TLB_SHIFT), - dma_bits); + dma_bits, &dma_handle); } while (rc && dma_bits++ < max_dma_bits); if (rc) return rc; @@ -294,11 +295,10 @@ xen_swiotlb_alloc_coherent(struct device *hwdev, size_t size, *dma_handle = dev_addr; else { if (xen_create_contiguous_region(vstart, order, - fls64(dma_mask)) != 0) { + fls64(dma_mask), dma_handle) != 0) { free_pages(vstart, order); return NULL; } - *dma_handle = virt_to_machine(ret).maddr; } memset(ret, 0, size); return ret; diff --git a/include/xen/xen-ops.h b/include/xen/xen-ops.h index d6fe062..9ef704d 100644 --- a/include/xen/xen-ops.h +++ b/include/xen/xen-ops.h @@ -20,7 +20,8 @@ int xen_setup_shutdown_event(void); extern unsigned long *xen_contiguous_bitmap; int xen_create_contiguous_region(unsigned long vstart, unsigned int order, - unsigned int address_bits); + unsigned int address_bits, + dma_addr_t *dma_handle); void xen_destroy_contiguous_region(unsigned long vstart, unsigned int order); |
