From mboxrd@z Thu Jan 1 00:00:00 1970 From: Stefano Stabellini Subject: [PATCH v3 08/10] xen: make xen_create_contiguous_region return the dma address Date: Mon, 5 Aug 2013 17:30:54 +0100 Message-ID: <1375720256-8014-8-git-send-email-stefano.stabellini@eu.citrix.com> References: Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=m.gmane.org@lists.infradead.org To: xen-devel@lists.xensource.com Cc: Ian.Campbell@citrix.com, Stefano Stabellini , linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, konrad.wilk@oracle.com List-Id: xen-devel@lists.xenproject.org Modify xen_create_contiguous_region to return the dma address of the newly contiguous buffer. Signed-off-by: Stefano Stabellini Reviewed-by: David Vrabel --- arch/x86/xen/mmu.c | 4 +++- drivers/xen/swiotlb-xen.c | 6 +++--- 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..df9ab44 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 = xen_virt_to_bus(vstart); 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); -- 1.7.2.5