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b754b35b08
Move the documentation into Documentation/gpu, link it up and pull in the kernel doc. No actual text changes except that I did polish the kerneldoc a bit, especially for vga_client_register(). v2: Remove some rst from vga-switcheroo.rst that I don't understand, but which seems to be the reason why the new vgaarbiter.rst sometimes drops out of the sidebar index. v3: Drop one level of headings and clarify the vgaarb one a bit. v4: Fix some typos (Sean). Cc: Jonathan Corbet <corbet@lwn.net> Cc: linux-doc@vger.kernel.org Cc: Sean Paul <seanpaul@chromium.org> Reviewed-by: Sean Paul <seanpaul@chromium.org> Signed-off-by: Daniel Vetter <daniel.vetter@intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/1471034937-651-20-git-send-email-daniel.vetter@ffwll.ch
159 lines
5.1 KiB
C
159 lines
5.1 KiB
C
/*
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* The VGA aribiter manages VGA space routing and VGA resource decode to
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* allow multiple VGA devices to be used in a system in a safe way.
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*
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* (C) Copyright 2005 Benjamin Herrenschmidt <benh@kernel.crashing.org>
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* (C) Copyright 2007 Paulo R. Zanoni <przanoni@gmail.com>
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* (C) Copyright 2007, 2009 Tiago Vignatti <vignatti@freedesktop.org>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS
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* IN THE SOFTWARE.
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*
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*/
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#ifndef LINUX_VGA_H
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#define LINUX_VGA_H
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#include <video/vga.h>
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/* Legacy VGA regions */
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#define VGA_RSRC_NONE 0x00
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#define VGA_RSRC_LEGACY_IO 0x01
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#define VGA_RSRC_LEGACY_MEM 0x02
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#define VGA_RSRC_LEGACY_MASK (VGA_RSRC_LEGACY_IO | VGA_RSRC_LEGACY_MEM)
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/* Non-legacy access */
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#define VGA_RSRC_NORMAL_IO 0x04
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#define VGA_RSRC_NORMAL_MEM 0x08
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/* Passing that instead of a pci_dev to use the system "default"
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* device, that is the one used by vgacon. Archs will probably
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* have to provide their own vga_default_device();
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*/
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#define VGA_DEFAULT_DEVICE (NULL)
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struct pci_dev;
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/* For use by clients */
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/**
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* vga_set_legacy_decoding
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*
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* @pdev: pci device of the VGA card
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* @decodes: bit mask of what legacy regions the card decodes
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*
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* Indicates to the arbiter if the card decodes legacy VGA IOs,
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* legacy VGA Memory, both, or none. All cards default to both,
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* the card driver (fbdev for example) should tell the arbiter
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* if it has disabled legacy decoding, so the card can be left
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* out of the arbitration process (and can be safe to take
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* interrupts at any time.
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*/
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#if defined(CONFIG_VGA_ARB)
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extern void vga_set_legacy_decoding(struct pci_dev *pdev,
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unsigned int decodes);
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#else
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static inline void vga_set_legacy_decoding(struct pci_dev *pdev,
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unsigned int decodes) { };
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#endif
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#if defined(CONFIG_VGA_ARB)
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extern int vga_get(struct pci_dev *pdev, unsigned int rsrc, int interruptible);
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#else
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static inline int vga_get(struct pci_dev *pdev, unsigned int rsrc, int interruptible) { return 0; }
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#endif
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/**
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* vga_get_interruptible
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* @pdev: pci device of the VGA card or NULL for the system default
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* @rsrc: bit mask of resources to acquire and lock
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*
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* Shortcut to vga_get with interruptible set to true.
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*
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* On success, release the VGA resource again with vga_put().
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*/
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static inline int vga_get_interruptible(struct pci_dev *pdev,
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unsigned int rsrc)
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{
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return vga_get(pdev, rsrc, 1);
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}
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/**
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* vga_get_uninterruptible - shortcut to vga_get()
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* @pdev: pci device of the VGA card or NULL for the system default
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* @rsrc: bit mask of resources to acquire and lock
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*
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* Shortcut to vga_get with interruptible set to false.
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*
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* On success, release the VGA resource again with vga_put().
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*/
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static inline int vga_get_uninterruptible(struct pci_dev *pdev,
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unsigned int rsrc)
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{
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return vga_get(pdev, rsrc, 0);
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}
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#if defined(CONFIG_VGA_ARB)
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extern int vga_tryget(struct pci_dev *pdev, unsigned int rsrc);
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#else
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static inline int vga_tryget(struct pci_dev *pdev, unsigned int rsrc) { return 0; }
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#endif
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#if defined(CONFIG_VGA_ARB)
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extern void vga_put(struct pci_dev *pdev, unsigned int rsrc);
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#else
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#define vga_put(pdev, rsrc)
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#endif
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#ifdef CONFIG_VGA_ARB
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extern struct pci_dev *vga_default_device(void);
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extern void vga_set_default_device(struct pci_dev *pdev);
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#else
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static inline struct pci_dev *vga_default_device(void) { return NULL; };
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static inline void vga_set_default_device(struct pci_dev *pdev) { };
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#endif
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/*
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* Architectures should define this if they have several
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* independent PCI domains that can afford concurrent VGA
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* decoding
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*/
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#ifndef __ARCH_HAS_VGA_CONFLICT
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static inline int vga_conflicts(struct pci_dev *p1, struct pci_dev *p2)
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{
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return 1;
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}
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#endif
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#if defined(CONFIG_VGA_ARB)
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int vga_client_register(struct pci_dev *pdev, void *cookie,
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void (*irq_set_state)(void *cookie, bool state),
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unsigned int (*set_vga_decode)(void *cookie, bool state));
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#else
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static inline int vga_client_register(struct pci_dev *pdev, void *cookie,
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void (*irq_set_state)(void *cookie, bool state),
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unsigned int (*set_vga_decode)(void *cookie, bool state))
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{
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return 0;
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}
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#endif
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#endif /* LINUX_VGA_H */
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