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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sart.h (1602B)

      1/* SPDX-License-Identifier: GPL-2.0-only OR MIT */
      2/*
      3 * Apple SART device driver
      4 * Copyright (C) The Asahi Linux Contributors
      5 *
      6 * Apple SART is a simple address filter for DMA transactions.
      7 * Regions of physical memory must be added to the SART's allow
      8 * list before any DMA can target these. Unlike a proper
      9 * IOMMU no remapping can be done.
     10 */
     11
     12#ifndef _LINUX_SOC_APPLE_SART_H_
     13#define _LINUX_SOC_APPLE_SART_H_
     14
     15#include <linux/device.h>
     16#include <linux/err.h>
     17#include <linux/types.h>
     18
     19struct apple_sart;
     20
     21/*
     22 * Get a reference to the SART attached to dev.
     23 *
     24 * Looks for the phandle reference in apple,sart and returns a pointer
     25 * to the corresponding apple_sart struct to be used with
     26 * apple_sart_add_allowed_region and apple_sart_remove_allowed_region.
     27 */
     28struct apple_sart *devm_apple_sart_get(struct device *dev);
     29
     30/*
     31 * Adds the region [paddr, paddr+size] to the DMA allow list.
     32 *
     33 * @sart: SART reference
     34 * @paddr: Start address of the region to be used for DMA
     35 * @size: Size of the region to be used for DMA.
     36 */
     37int apple_sart_add_allowed_region(struct apple_sart *sart, phys_addr_t paddr,
     38				  size_t size);
     39
     40/*
     41 * Removes the region [paddr, paddr+size] from the DMA allow list.
     42 *
     43 * Note that exact same paddr and size used for apple_sart_add_allowed_region
     44 * have to be passed.
     45 *
     46 * @sart: SART reference
     47 * @paddr: Start address of the region no longer used for DMA
     48 * @size: Size of the region no longer used for DMA.
     49 */
     50int apple_sart_remove_allowed_region(struct apple_sart *sart, phys_addr_t paddr,
     51				     size_t size);
     52
     53#endif /* _LINUX_SOC_APPLE_SART_H_ */