cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

vgaarb.h (3972B)

      1/*
      2 * The VGA aribiter manages VGA space routing and VGA resource decode to
      3 * allow multiple VGA devices to be used in a system in a safe way.
      4 *
      5 * (C) Copyright 2005 Benjamin Herrenschmidt <benh@kernel.crashing.org>
      6 * (C) Copyright 2007 Paulo R. Zanoni <przanoni@gmail.com>
      7 * (C) Copyright 2007, 2009 Tiago Vignatti <vignatti@freedesktop.org>
      8 *
      9 * Permission is hereby granted, free of charge, to any person obtaining a
     10 * copy of this software and associated documentation files (the "Software"),
     11 * to deal in the Software without restriction, including without limitation
     12 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
     13 * and/or sell copies of the Software, and to permit persons to whom the
     14 * Software is furnished to do so, subject to the following conditions:
     15 *
     16 * The above copyright notice and this permission notice (including the next
     17 * paragraph) shall be included in all copies or substantial portions of the
     18 * Software.
     19 *
     20 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
     21 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
     22 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
     23 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
     24 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
     25 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
     26 * DEALINGS
     27 * IN THE SOFTWARE.
     28 *
     29 */
     30
     31#ifndef LINUX_VGA_H
     32#define LINUX_VGA_H
     33
     34#include <video/vga.h>
     35
     36struct pci_dev;
     37
     38/* Legacy VGA regions */
     39#define VGA_RSRC_NONE	       0x00
     40#define VGA_RSRC_LEGACY_IO     0x01
     41#define VGA_RSRC_LEGACY_MEM    0x02
     42#define VGA_RSRC_LEGACY_MASK   (VGA_RSRC_LEGACY_IO | VGA_RSRC_LEGACY_MEM)
     43/* Non-legacy access */
     44#define VGA_RSRC_NORMAL_IO     0x04
     45#define VGA_RSRC_NORMAL_MEM    0x08
     46
     47#ifdef CONFIG_VGA_ARB
     48void vga_set_legacy_decoding(struct pci_dev *pdev, unsigned int decodes);
     49int vga_get(struct pci_dev *pdev, unsigned int rsrc, int interruptible);
     50void vga_put(struct pci_dev *pdev, unsigned int rsrc);
     51struct pci_dev *vga_default_device(void);
     52void vga_set_default_device(struct pci_dev *pdev);
     53int vga_remove_vgacon(struct pci_dev *pdev);
     54int vga_client_register(struct pci_dev *pdev,
     55		unsigned int (*set_decode)(struct pci_dev *pdev, bool state));
     56#else /* CONFIG_VGA_ARB */
     57static inline void vga_set_legacy_decoding(struct pci_dev *pdev,
     58		unsigned int decodes)
     59{
     60};
     61static inline int vga_get(struct pci_dev *pdev, unsigned int rsrc,
     62		int interruptible)
     63{
     64	return 0;
     65}
     66static inline void vga_put(struct pci_dev *pdev, unsigned int rsrc)
     67{
     68}
     69static inline struct pci_dev *vga_default_device(void)
     70{
     71	return NULL;
     72}
     73static inline void vga_set_default_device(struct pci_dev *pdev)
     74{
     75}
     76static inline int vga_remove_vgacon(struct pci_dev *pdev)
     77{
     78	return 0;
     79}
     80static inline int vga_client_register(struct pci_dev *pdev,
     81		unsigned int (*set_decode)(struct pci_dev *pdev, bool state))
     82{
     83	return 0;
     84}
     85#endif /* CONFIG_VGA_ARB */
     86
     87/**
     88 * vga_get_interruptible
     89 * @pdev: pci device of the VGA card or NULL for the system default
     90 * @rsrc: bit mask of resources to acquire and lock
     91 *
     92 * Shortcut to vga_get with interruptible set to true.
     93 *
     94 * On success, release the VGA resource again with vga_put().
     95 */
     96static inline int vga_get_interruptible(struct pci_dev *pdev,
     97					unsigned int rsrc)
     98{
     99       return vga_get(pdev, rsrc, 1);
    100}
    101
    102/**
    103 * vga_get_uninterruptible - shortcut to vga_get()
    104 * @pdev: pci device of the VGA card or NULL for the system default
    105 * @rsrc: bit mask of resources to acquire and lock
    106 *
    107 * Shortcut to vga_get with interruptible set to false.
    108 *
    109 * On success, release the VGA resource again with vga_put().
    110 */
    111static inline int vga_get_uninterruptible(struct pci_dev *pdev,
    112					  unsigned int rsrc)
    113{
    114       return vga_get(pdev, rsrc, 0);
    115}
    116
    117static inline void vga_client_unregister(struct pci_dev *pdev)
    118{
    119	vga_client_register(pdev, NULL);
    120}
    121
    122#endif /* LINUX_VGA_H */