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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acpi_dma.h (3154B)

      1/* SPDX-License-Identifier: GPL-2.0-only */
      2/*
      3 * ACPI helpers for DMA request / controller
      4 *
      5 * Based on of_dma.h
      6 *
      7 * Copyright (C) 2013, Intel Corporation
      8 * Author: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
      9 */
     10
     11#ifndef __LINUX_ACPI_DMA_H
     12#define __LINUX_ACPI_DMA_H
     13
     14#include <linux/list.h>
     15#include <linux/device.h>
     16#include <linux/err.h>
     17#include <linux/dmaengine.h>
     18
     19/**
     20 * struct acpi_dma_spec - slave device DMA resources
     21 * @chan_id:	channel unique id
     22 * @slave_id:	request line unique id
     23 * @dev:	struct device of the DMA controller to be used in the filter
     24 *		function
     25 */
     26struct acpi_dma_spec {
     27	int		chan_id;
     28	int		slave_id;
     29	struct device	*dev;
     30};
     31
     32/**
     33 * struct acpi_dma - representation of the registered DMAC
     34 * @dma_controllers:	linked list node
     35 * @dev:		struct device of this controller
     36 * @acpi_dma_xlate:	callback function to find a suitable channel
     37 * @data:		private data used by a callback function
     38 * @base_request_line:	first supported request line (CSRT)
     39 * @end_request_line:	last supported request line (CSRT)
     40 */
     41struct acpi_dma {
     42	struct list_head	dma_controllers;
     43	struct device		*dev;
     44	struct dma_chan		*(*acpi_dma_xlate)
     45				(struct acpi_dma_spec *, struct acpi_dma *);
     46	void			*data;
     47	unsigned short		base_request_line;
     48	unsigned short		end_request_line;
     49};
     50
     51/* Used with acpi_dma_simple_xlate() */
     52struct acpi_dma_filter_info {
     53	dma_cap_mask_t	dma_cap;
     54	dma_filter_fn	filter_fn;
     55};
     56
     57#ifdef CONFIG_DMA_ACPI
     58
     59int acpi_dma_controller_register(struct device *dev,
     60		struct dma_chan *(*acpi_dma_xlate)
     61		(struct acpi_dma_spec *, struct acpi_dma *),
     62		void *data);
     63int acpi_dma_controller_free(struct device *dev);
     64int devm_acpi_dma_controller_register(struct device *dev,
     65		struct dma_chan *(*acpi_dma_xlate)
     66		(struct acpi_dma_spec *, struct acpi_dma *),
     67		void *data);
     68void devm_acpi_dma_controller_free(struct device *dev);
     69
     70struct dma_chan *acpi_dma_request_slave_chan_by_index(struct device *dev,
     71						      size_t index);
     72struct dma_chan *acpi_dma_request_slave_chan_by_name(struct device *dev,
     73						     const char *name);
     74
     75struct dma_chan *acpi_dma_simple_xlate(struct acpi_dma_spec *dma_spec,
     76				       struct acpi_dma *adma);
     77#else
     78
     79static inline int acpi_dma_controller_register(struct device *dev,
     80		struct dma_chan *(*acpi_dma_xlate)
     81		(struct acpi_dma_spec *, struct acpi_dma *),
     82		void *data)
     83{
     84	return -ENODEV;
     85}
     86static inline int acpi_dma_controller_free(struct device *dev)
     87{
     88	return -ENODEV;
     89}
     90static inline int devm_acpi_dma_controller_register(struct device *dev,
     91		struct dma_chan *(*acpi_dma_xlate)
     92		(struct acpi_dma_spec *, struct acpi_dma *),
     93		void *data)
     94{
     95	return -ENODEV;
     96}
     97static inline void devm_acpi_dma_controller_free(struct device *dev)
     98{
     99}
    100
    101static inline struct dma_chan *acpi_dma_request_slave_chan_by_index(
    102		struct device *dev, size_t index)
    103{
    104	return ERR_PTR(-ENODEV);
    105}
    106static inline struct dma_chan *acpi_dma_request_slave_chan_by_name(
    107		struct device *dev, const char *name)
    108{
    109	return ERR_PTR(-ENODEV);
    110}
    111
    112#define acpi_dma_simple_xlate	NULL
    113
    114#endif
    115
    116#define acpi_dma_request_slave_channel	acpi_dma_request_slave_chan_by_index
    117
    118#endif /* __LINUX_ACPI_DMA_H */