Merge tag 'arm64-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64...

[linux-2.6-block.git] / arch / arm64 / mm / dma-mapping.c

diff --git a/arch/arm64/mm/dma-mapping.c b/arch/arm64/mm/dma-mapping.c
index 674860e3e478f3015d21b39bd9669a39efdc2be6..1d17dbeafe7605f6c5efe63ae192b35e27046faf 100644 (file)
--- a/arch/arm64/mm/dma-mapping.c
+++ b/arch/arm64/mm/dma-mapping.c
@@ -1,20 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  * SWIOTLB-based DMA API implementation
  *
  * Copyright (C) 2012 ARM Ltd.
  * Author: Catalin Marinas <catalin.marinas@arm.com>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
 #include <linux/gfp.h>
@@ -91,10 +80,6 @@ static int __swiotlb_mmap_pfn(struct vm_area_struct *vma,
 
 static int __init arm64_dma_init(void)
 {
-       WARN_TAINT(ARCH_DMA_MINALIGN < cache_line_size(),
-                  TAINT_CPU_OUT_OF_SPEC,
-                  "ARCH_DMA_MINALIGN smaller than CTR_EL0.CWG (%d < %d)",
-                  ARCH_DMA_MINALIGN, cache_line_size());
        return dma_atomic_pool_init(GFP_DMA32, __pgprot(PROT_NORMAL_NC));
 }
 arch_initcall(arm64_dma_init);
@@ -472,6 +457,14 @@ static void __iommu_setup_dma_ops(struct device *dev, u64 dma_base, u64 size,
 void arch_setup_dma_ops(struct device *dev, u64 dma_base, u64 size,
                        const struct iommu_ops *iommu, bool coherent)
 {
+       int cls = cache_line_size_of_cpu();
+
+       WARN_TAINT(!coherent && cls > ARCH_DMA_MINALIGN,
+                  TAINT_CPU_OUT_OF_SPEC,
+                  "%s %s: ARCH_DMA_MINALIGN smaller than CTR_EL0.CWG (%d < %d)",
+                  dev_driver_string(dev), dev_name(dev),
+                  ARCH_DMA_MINALIGN, cls);
+
        dev->dma_coherent = coherent;
        __iommu_setup_dma_ops(dev, dma_base, size, iommu);