Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
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
15void 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
23void 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
34void 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
41void 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}