linux-kernel - [PATCH 48/67] swiotlb: rely on dev->coherent_dma

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Date:   Fri, 29 Dec 2017 09:18:52 +0100
From:   Christoph Hellwig <hch@....de>
To:     iommu@...ts.linux-foundation.org
Cc:     linux-alpha@...r.kernel.org, linux-snps-arc@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org,
        adi-buildroot-devel@...ts.sourceforge.net,
        linux-c6x-dev@...ux-c6x.org, linux-cris-kernel@...s.com,
        linux-hexagon@...r.kernel.org, linux-ia64@...r.kernel.org,
        linux-m68k@...ts.linux-m68k.org, linux-metag@...r.kernel.org,
        Michal Simek <monstr@...str.eu>, linux-mips@...ux-mips.org,
        linux-parisc@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        patches@...ups.riscv.org, linux-s390@...r.kernel.org,
        linux-sh@...r.kernel.org, sparclinux@...r.kernel.org,
        Guan Xuetao <gxt@...c.pku.edu.cn>, x86@...nel.org,
        linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 48/67] swiotlb: rely on dev->coherent_dma_mask

These days the coherent DMA mask is always set, so don't work around the
lack of it.

Signed-off-by: Christoph Hellwig <hch@....de>
---
 lib/swiotlb.c | 10 +++-------
 1 file changed, 3 insertions(+), 7 deletions(-)

diff --git a/lib/swiotlb.c b/lib/swiotlb.c
index e0b8980334c3..a14fff30ee9d 100644
--- a/lib/swiotlb.c
+++ b/lib/swiotlb.c
@@ -716,15 +716,11 @@ swiotlb_alloc_coherent(struct device *hwdev, size_t size,
 	dma_addr_t dev_addr;
 	void *ret;
 	int order = get_order(size);
-	u64 dma_mask = DMA_BIT_MASK(32);
-
-	if (hwdev && hwdev->coherent_dma_mask)
-		dma_mask = hwdev->coherent_dma_mask;
 
 	ret = (void *)__get_free_pages(flags, order);
 	if (ret) {
 		dev_addr = swiotlb_virt_to_bus(hwdev, ret);
-		if (dev_addr + size - 1 > dma_mask) {
+		if (dev_addr + size - 1 > hwdev->coherent_dma_mask) {
 			/*
 			 * The allocated memory isn't reachable by the device.
 			 */
@@ -747,9 +743,9 @@ swiotlb_alloc_coherent(struct device *hwdev, size_t size,
 		dev_addr = swiotlb_phys_to_dma(hwdev, paddr);
 
 		/* Confirm address can be DMA'd by device */
-		if (dev_addr + size - 1 > dma_mask) {
+		if (dev_addr + size - 1 > hwdev->coherent_dma_mask) {
 			printk("hwdev DMA mask = 0x%016Lx, dev_addr = 0x%016Lx\n",
-			       (unsigned long long)dma_mask,
+			       (unsigned long long)hwdev->coherent_dma_mask,
 			       (unsigned long long)dev_addr);
 
 			/*
-- 
2.14.2