[PATCH 48/67] swiotlb: rely on dev->coherent_dma_mask
From: Christoph Hellwig <hch@lst.de>
Date: 2017-12-29 08:28:59
Also in:
linux-alpha, linux-arch, linux-arm-kernel, linux-iommu, linux-mips, linux-s390, linux-sh, lkml, sparclinux
Subsystem:
library code, the rest · Maintainers:
Andrew Morton, Linus Torvalds
These days the coherent DMA mask is always set, so don't work around the lack of it. Signed-off-by: Christoph Hellwig <hch@lst.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