cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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dma.c (972B)

      1// SPDX-License-Identifier: GPL-2.0
      2/*
      3 * Copyright (C) 2009-2010 PetaLogix
      4 * Copyright (C) 2006 Benjamin Herrenschmidt, IBM Corporation
      5 *
      6 * Provide default implementations of the DMA mapping callbacks for
      7 * directly mapped busses.
      8 */
      9
     10#include <linux/device.h>
     11#include <linux/dma-map-ops.h>
     12#include <linux/gfp.h>
     13#include <linux/export.h>
     14#include <linux/bug.h>
     15#include <asm/cacheflush.h>
     16
     17static void __dma_sync(phys_addr_t paddr, size_t size,
     18		enum dma_data_direction direction)
     19{
     20	switch (direction) {
     21	case DMA_TO_DEVICE:
     22	case DMA_BIDIRECTIONAL:
     23		flush_dcache_range(paddr, paddr + size);
     24		break;
     25	case DMA_FROM_DEVICE:
     26		invalidate_dcache_range(paddr, paddr + size);
     27		break;
     28	default:
     29		BUG();
     30	}
     31}
     32
     33void arch_sync_dma_for_device(phys_addr_t paddr, size_t size,
     34		enum dma_data_direction dir)
     35{
     36	__dma_sync(paddr, size, dir);
     37}
     38
     39void arch_sync_dma_for_cpu(phys_addr_t paddr, size_t size,
     40		enum dma_data_direction dir)
     41{
     42	__dma_sync(paddr, size, dir);
     43}