arch/arm64/mm/dma-mapping.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) 2012 ARM Ltd.
   4  * Author: Catalin Marinas <catalin.marinas@arm.com>
   5  */
   6
   7 #include <linux/gfp.h>
   8 #include <linux/cache.h>
   9 #include <linux/dma-map-ops.h>
  10 #include <xen/xen.h>
  11
  12 #include <asm/cacheflush.h>
  13 #include <asm/xen/xen-ops.h>
  14
  15 void arch_sync_dma_for_device(phys_addr_t paddr, size_t size,
  16                               enum dma_data_direction dir)
  17 {
  18         unsigned long start = (unsigned long)phys_to_virt(paddr);
  19
  20         dcache_clean_poc(start, start + size);
  21 }
  22
  23 void arch_sync_dma_for_cpu(phys_addr_t paddr, size_t size,
  24                            enum dma_data_direction dir)
  25 {
  26         unsigned long start = (unsigned long)phys_to_virt(paddr);
  27
  28         if (dir == DMA_TO_DEVICE)
  29                 return;
  30
  31         dcache_inval_poc(start, start + size);
  32 }
  33
  34 void arch_dma_prep_coherent(struct page *page, size_t size)
  35 {
  36         unsigned long start = (unsigned long)page_address(page);
  37
  38         dcache_clean_poc(start, start + size);
  39 }
  40
  41 void arch_setup_dma_ops(struct device *dev, bool coherent)
  42 {
  43         int cls = cache_line_size_of_cpu();
  44
  45         WARN_TAINT(!coherent && cls > ARCH_DMA_MINALIGN,
  46                    TAINT_CPU_OUT_OF_SPEC,
  47                    "%s %s: ARCH_DMA_MINALIGN smaller than CTR_EL0.CWG (%d < %d)",
  48                    dev_driver_string(dev), dev_name(dev),
  49                    ARCH_DMA_MINALIGN, cls);
  50
  51         dev->dma_coherent = coherent;
  52
  53         xen_setup_dma_ops(dev);
  54 }