WebSVN – Kolibri OS – Diff – /drivers/include/linux/vgaarb.h


/*
 * The VGA aribiter manages VGA space routing and VGA resource decode to
 * allow multiple VGA devices to be used in a system in a safe way.
 *
 * (C) Copyright 2005 Benjamin Herrenschmidt 
 * (C) Copyright 2007 Paulo R. Zanoni 
 * (C) Copyright 2007, 2009 Tiago Vignatti 
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS
 * IN THE SOFTWARE.
 *
 */
 
#ifndef LINUX_VGA_H
#define LINUX_VGA_H
 
//#include 
 
/* Legacy VGA regions */
#define VGA_RSRC_NONE	       0x00
#define VGA_RSRC_LEGACY_IO     0x01
#define VGA_RSRC_LEGACY_MEM    0x02
#define VGA_RSRC_LEGACY_MASK   (VGA_RSRC_LEGACY_IO | VGA_RSRC_LEGACY_MEM)
/* Non-legacy access */
#define VGA_RSRC_NORMAL_IO     0x04
#define VGA_RSRC_NORMAL_MEM    0x08
 
/* Passing that instead of a pci_dev to use the system "default"
 * device, that is the one used by vgacon. Archs will probably
 * have to provide their own vga_default_device();
 */
#define VGA_DEFAULT_DEVICE     (NULL)
 
struct pci_dev;
 
/* For use by clients */
 
/**
 *     vga_set_legacy_decoding
 *
 *     @pdev: pci device of the VGA card
 *     @decodes: bit mask of what legacy regions the card decodes
 *
 *     Indicates to the arbiter if the card decodes legacy VGA IOs,
 *     legacy VGA Memory, both, or none. All cards default to both,
 *     the card driver (fbdev for example) should tell the arbiter
 *     if it has disabled legacy decoding, so the card can be left
 *     out of the arbitration process (and can be safe to take
 *     interrupts at any time.
 */
#if defined(CONFIG_VGA_ARB)
extern void vga_set_legacy_decoding(struct pci_dev *pdev,
				    unsigned int decodes);
#else
static inline void vga_set_legacy_decoding(struct pci_dev *pdev,
					   unsigned int decodes) { };
#endif
 
/**
 *     vga_get         - acquire & locks VGA resources
 *
 *     @pdev: pci device of the VGA card or NULL for the system default
 *     @rsrc: bit mask of resources to acquire and lock
 *     @interruptible: blocking should be interruptible by signals ?
 *
 *     This function acquires VGA resources for the given
 *     card and mark those resources locked. If the resource requested
 *     are "normal" (and not legacy) resources, the arbiter will first check
 *     whether the card is doing legacy decoding for that type of resource. If
 *     yes, the lock is "converted" into a legacy resource lock.
 *     The arbiter will first look for all VGA cards that might conflict
 *     and disable their IOs and/or Memory access, including VGA forwarding
 *     on P2P bridges if necessary, so that the requested resources can
 *     be used. Then, the card is marked as locking these resources and
 *     the IO and/or Memory accesse are enabled on the card (including
 *     VGA forwarding on parent P2P bridges if any).
 *     This function will block if some conflicting card is already locking
 *     one of the required resources (or any resource on a different bus
 *     segment, since P2P bridges don't differenciate VGA memory and IO
 *     afaik). You can indicate whether this blocking should be interruptible
 *     by a signal (for userland interface) or not.
 *     Must not be called at interrupt time or in atomic context.
 *     If the card already owns the resources, the function succeeds.
 *     Nested calls are supported (a per-resource counter is maintained)
 */
 
#if defined(CONFIG_VGA_ARB)
extern int vga_get(struct pci_dev *pdev, unsigned int rsrc, int interruptible);
#else
static inline int vga_get(struct pci_dev *pdev, unsigned int rsrc, int interruptible) { return 0; }
#endif
 
/**
 *     vga_get_interruptible
 *
 *     Shortcut to vga_get
 */
 
static inline int vga_get_interruptible(struct pci_dev *pdev,
					unsigned int rsrc)
{
       return vga_get(pdev, rsrc, 1);
}
 
/**
 *     vga_get_uninterruptible
 *
 *     Shortcut to vga_get
 */
 
static inline int vga_get_uninterruptible(struct pci_dev *pdev,
					  unsigned int rsrc)
{
       return vga_get(pdev, rsrc, 0);
}
 
/**
 *     vga_tryget      - try to acquire & lock legacy VGA resources
 *
 *     @pdev: pci devivce of VGA card or NULL for system default
 *     @rsrc: bit mask of resources to acquire and lock
 *
 *     This function performs the same operation as vga_get(), but
 *     will return an error (-EBUSY) instead of blocking if the resources
 *     are already locked by another card. It can be called in any context
 */
 
#if defined(CONFIG_VGA_ARB)
extern int vga_tryget(struct pci_dev *pdev, unsigned int rsrc);
#else
static inline int vga_tryget(struct pci_dev *pdev, unsigned int rsrc) { return 0; }
#endif
 
/**
 *     vga_put         - release lock on legacy VGA resources
 *
 *     @pdev: pci device of VGA card or NULL for system default
 *     @rsrc: but mask of resource to release
 *
 *     This function releases resources previously locked by vga_get()
 *     or vga_tryget(). The resources aren't disabled right away, so
 *     that a subsequence vga_get() on the same card will succeed
 *     immediately. Resources have a counter, so locks are only
 *     released if the counter reaches 0.
 */
 
#if defined(CONFIG_VGA_ARB)
extern void vga_put(struct pci_dev *pdev, unsigned int rsrc);
#else
#define vga_put(pdev, rsrc)
#endif
 
 
/**
 *     vga_default_device
 *
 *     This can be defined by the platform. The default implementation
 *     is rather dumb and will probably only work properly on single
 *     vga card setups and/or x86 platforms.
 *
 *     If your VGA default device is not PCI, you'll have to return
 *     NULL here. In this case, I assume it will not conflict with
 *     any PCI card. If this is not true, I'll have to define two archs
 *     hooks for enabling/disabling the VGA default device if that is
 *     possible. This may be a problem with real _ISA_ VGA cards, in
 *     addition to a PCI one. I don't know at this point how to deal
 *     with that card. Can theirs IOs be disabled at all ? If not, then
 *     I suppose it's a matter of having the proper arch hook telling
 *     us about it, so we basically never allow anybody to succeed a
 *     vga_get()...
 */
 
#ifdef CONFIG_VGA_ARB
extern struct pci_dev *vga_default_device(void);
extern void vga_set_default_device(struct pci_dev *pdev);
#else
static inline struct pci_dev *vga_default_device(void) { return NULL; };
static inline void vga_set_default_device(struct pci_dev *pdev) { };
#endif
 
/**
 *     vga_conflicts
 *
 *     Architectures should define this if they have several
 *     independent PCI domains that can afford concurrent VGA
 *     decoding
 */
 
#ifndef __ARCH_HAS_VGA_CONFLICT
static inline int vga_conflicts(struct pci_dev *p1, struct pci_dev *p2)
{
       return 1;
}
#endif
 
/**
 *	vga_client_register
 *
 *	@pdev: pci device of the VGA client
 *	@cookie: client cookie to be used in callbacks
 *	@irq_set_state: irq state change callback
 *	@set_vga_decode: vga decode change callback
 *
 * 	return value: 0 on success, -1 on failure
 * 	Register a client with the VGA arbitration logic
 *
 *	Clients have two callback mechanisms they can use.
 *	irq enable/disable callback -
 *		If a client can't disable its GPUs VGA resources, then we
 *		need to be able to ask it to turn off its irqs when we
 *		turn off its mem and io decoding.
 *	set_vga_decode
 *		If a client can disable its GPU VGA resource, it will
 *		get a callback from this to set the encode/decode state
 *
 * Rationale: we cannot disable VGA decode resources unconditionally
 * some single GPU laptops seem to require ACPI or BIOS access to the
 * VGA registers to control things like backlights etc.
 * Hopefully newer multi-GPU laptops do something saner, and desktops
 * won't have any special ACPI for this.
 * They driver will get a callback when VGA arbitration is first used
 * by userspace since we some older X servers have issues.
 */
#if defined(CONFIG_VGA_ARB)
int vga_client_register(struct pci_dev *pdev, void *cookie,
			void (*irq_set_state)(void *cookie, bool state),
			unsigned int (*set_vga_decode)(void *cookie, bool state));
#else
static inline int vga_client_register(struct pci_dev *pdev, void *cookie,
				      void (*irq_set_state)(void *cookie, bool state),
				      unsigned int (*set_vga_decode)(void *cookie, bool state))
{
	return 0;
}
#endif
 
#endif /* LINUX_VGA_H */

Subversion Repositories Kolibri OS

(root)/drivers/include/linux/vgaarb.h – Rev 5270 → 6082

Rev 5270		Rev 6082
1	/*	1	/*
2	* The VGA aribiter manages VGA space routing and VGA resource decode to	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.	3	* allow multiple VGA devices to be used in a system in a safe way.
4	*	4	*
5	* (C) Copyright 2005 Benjamin Herrenschmidt	5	* (C) Copyright 2005 Benjamin Herrenschmidt
6	* (C) Copyright 2007 Paulo R. Zanoni	6	* (C) Copyright 2007 Paulo R. Zanoni
7	* (C) Copyright 2007, 2009 Tiago Vignatti	7	* (C) Copyright 2007, 2009 Tiago Vignatti
8	*	8	*
9	* Permission is hereby granted, free of charge, to any person obtaining a	9	* Permission is hereby granted, free of charge, to any person obtaining a
10	* copy of this software and associated documentation files (the "Software"),	10	* copy of this software and associated documentation files (the "Software"),
11	* to deal in the Software without restriction, including without limitation	11	* to deal in the Software without restriction, including without limitation
12	* the rights to use, copy, modify, merge, publish, distribute, sublicense,	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	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:	14	* Software is furnished to do so, subject to the following conditions:
15	*	15	*
16	* The above copyright notice and this permission notice (including the next	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	17	* paragraph) shall be included in all copies or substantial portions of the
18	* Software.	18	* Software.
19	*	19	*
20	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR	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,	21	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
22	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL	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	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	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	25	* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
26	* DEALINGS	26	* DEALINGS
27	* IN THE SOFTWARE.	27	* IN THE SOFTWARE.
28	*	28	*
29	*/	29	*/
30		30
31	#ifndef LINUX_VGA_H	31	#ifndef LINUX_VGA_H
32	#define LINUX_VGA_H	32	#define LINUX_VGA_H
33		33
34	//#include	34	//#include
35		35
36	/* Legacy VGA regions */	36	/* Legacy VGA regions */
37	#define VGA_RSRC_NONE 0x00	37	#define VGA_RSRC_NONE 0x00
38	#define VGA_RSRC_LEGACY_IO 0x01	38	#define VGA_RSRC_LEGACY_IO 0x01
39	#define VGA_RSRC_LEGACY_MEM 0x02	39	#define VGA_RSRC_LEGACY_MEM 0x02
40	#define VGA_RSRC_LEGACY_MASK (VGA_RSRC_LEGACY_IO \| VGA_RSRC_LEGACY_MEM)	40	#define VGA_RSRC_LEGACY_MASK (VGA_RSRC_LEGACY_IO \| VGA_RSRC_LEGACY_MEM)
41	/* Non-legacy access */	41	/* Non-legacy access */
42	#define VGA_RSRC_NORMAL_IO 0x04	42	#define VGA_RSRC_NORMAL_IO 0x04
43	#define VGA_RSRC_NORMAL_MEM 0x08	43	#define VGA_RSRC_NORMAL_MEM 0x08
44		44
45	/* Passing that instead of a pci_dev to use the system "default"	45	/* Passing that instead of a pci_dev to use the system "default"
46	* device, that is the one used by vgacon. Archs will probably	46	* device, that is the one used by vgacon. Archs will probably
47	* have to provide their own vga_default_device();	47	* have to provide their own vga_default_device();
48	*/	48	*/
49	#define VGA_DEFAULT_DEVICE (NULL)	49	#define VGA_DEFAULT_DEVICE (NULL)
50		50
51	struct pci_dev;	51	struct pci_dev;
52		52
53	/* For use by clients */	53	/* For use by clients */
54		54
55	/**	55	/**
56	* vga_set_legacy_decoding	56	* vga_set_legacy_decoding
57	*	57	*
58	* @pdev: pci device of the VGA card	58	* @pdev: pci device of the VGA card
59	* @decodes: bit mask of what legacy regions the card decodes	59	* @decodes: bit mask of what legacy regions the card decodes
60	*	60	*
61	* Indicates to the arbiter if the card decodes legacy VGA IOs,	61	* Indicates to the arbiter if the card decodes legacy VGA IOs,
62	* legacy VGA Memory, both, or none. All cards default to both,	62	* legacy VGA Memory, both, or none. All cards default to both,
63	* the card driver (fbdev for example) should tell the arbiter	63	* the card driver (fbdev for example) should tell the arbiter
64	* if it has disabled legacy decoding, so the card can be left	64	* if it has disabled legacy decoding, so the card can be left
65	* out of the arbitration process (and can be safe to take	65	* out of the arbitration process (and can be safe to take
66	* interrupts at any time.	66	* interrupts at any time.
67	*/	67	*/
-		68	#if defined(CONFIG_VGA_ARB)
68	extern void vga_set_legacy_decoding(struct pci_dev *pdev,	69	extern void vga_set_legacy_decoding(struct pci_dev *pdev,
69	unsigned int decodes);	70	unsigned int decodes);
-		71	#else
-		72	static inline void vga_set_legacy_decoding(struct pci_dev *pdev,
-		73	unsigned int decodes) { };
-		74	#endif
70		75
71	/**	76	/**
72	* vga_get - acquire & locks VGA resources	77	* vga_get - acquire & locks VGA resources
73	*	78	*
74	* @pdev: pci device of the VGA card or NULL for the system default	79	* @pdev: pci device of the VGA card or NULL for the system default
75	* @rsrc: bit mask of resources to acquire and lock	80	* @rsrc: bit mask of resources to acquire and lock
76	* @interruptible: blocking should be interruptible by signals ?	81	* @interruptible: blocking should be interruptible by signals ?
77	*	82	*
78	* This function acquires VGA resources for the given	83	* This function acquires VGA resources for the given
79	* card and mark those resources locked. If the resource requested	84	* card and mark those resources locked. If the resource requested
80	* are "normal" (and not legacy) resources, the arbiter will first check	85	* are "normal" (and not legacy) resources, the arbiter will first check
81	* whether the card is doing legacy decoding for that type of resource. If	86	* whether the card is doing legacy decoding for that type of resource. If
82	* yes, the lock is "converted" into a legacy resource lock.	87	* yes, the lock is "converted" into a legacy resource lock.
83	* The arbiter will first look for all VGA cards that might conflict	88	* The arbiter will first look for all VGA cards that might conflict
84	* and disable their IOs and/or Memory access, including VGA forwarding	89	* and disable their IOs and/or Memory access, including VGA forwarding
85	* on P2P bridges if necessary, so that the requested resources can	90	* on P2P bridges if necessary, so that the requested resources can
86	* be used. Then, the card is marked as locking these resources and	91	* be used. Then, the card is marked as locking these resources and
87	* the IO and/or Memory accesse are enabled on the card (including	92	* the IO and/or Memory accesse are enabled on the card (including
88	* VGA forwarding on parent P2P bridges if any).	93	* VGA forwarding on parent P2P bridges if any).
89	* This function will block if some conflicting card is already locking	94	* This function will block if some conflicting card is already locking
90	* one of the required resources (or any resource on a different bus	95	* one of the required resources (or any resource on a different bus
91	* segment, since P2P bridges don't differenciate VGA memory and IO	96	* segment, since P2P bridges don't differenciate VGA memory and IO
92	* afaik). You can indicate whether this blocking should be interruptible	97	* afaik). You can indicate whether this blocking should be interruptible
93	* by a signal (for userland interface) or not.	98	* by a signal (for userland interface) or not.
94	* Must not be called at interrupt time or in atomic context.	99	* Must not be called at interrupt time or in atomic context.
95	* If the card already owns the resources, the function succeeds.	100	* If the card already owns the resources, the function succeeds.
96	* Nested calls are supported (a per-resource counter is maintained)	101	* Nested calls are supported (a per-resource counter is maintained)
97	*/	102	*/
98		103
99	#if defined(CONFIG_VGA_ARB)	104	#if defined(CONFIG_VGA_ARB)
100	extern int vga_get(struct pci_dev *pdev, unsigned int rsrc, int interruptible);	105	extern int vga_get(struct pci_dev *pdev, unsigned int rsrc, int interruptible);
101	#else	106	#else
102	static inline int vga_get(struct pci_dev *pdev, unsigned int rsrc, int interruptible) { return 0; }	107	static inline int vga_get(struct pci_dev *pdev, unsigned int rsrc, int interruptible) { return 0; }
103	#endif	108	#endif
104		109
105	/**	110	/**
106	* vga_get_interruptible	111	* vga_get_interruptible
107	*	112	*
108	* Shortcut to vga_get	113	* Shortcut to vga_get
109	*/	114	*/
110		115
111	static inline int vga_get_interruptible(struct pci_dev *pdev,	116	static inline int vga_get_interruptible(struct pci_dev *pdev,
112	unsigned int rsrc)	117	unsigned int rsrc)
113	{	118	{
114	return vga_get(pdev, rsrc, 1);	119	return vga_get(pdev, rsrc, 1);
115	}	120	}
116		121
117	/**	122	/**
118	* vga_get_uninterruptible	123	* vga_get_uninterruptible
119	*	124	*
120	* Shortcut to vga_get	125	* Shortcut to vga_get
121	*/	126	*/
122		127
123	static inline int vga_get_uninterruptible(struct pci_dev *pdev,	128	static inline int vga_get_uninterruptible(struct pci_dev *pdev,
124	unsigned int rsrc)	129	unsigned int rsrc)
125	{	130	{
126	return vga_get(pdev, rsrc, 0);	131	return vga_get(pdev, rsrc, 0);
127	}	132	}
128		133
129	/**	134	/**
130	* vga_tryget - try to acquire & lock legacy VGA resources	135	* vga_tryget - try to acquire & lock legacy VGA resources
131	*	136	*
132	* @pdev: pci devivce of VGA card or NULL for system default	137	* @pdev: pci devivce of VGA card or NULL for system default
133	* @rsrc: bit mask of resources to acquire and lock	138	* @rsrc: bit mask of resources to acquire and lock
134	*	139	*
135	* This function performs the same operation as vga_get(), but	140	* This function performs the same operation as vga_get(), but
136	* will return an error (-EBUSY) instead of blocking if the resources	141	* will return an error (-EBUSY) instead of blocking if the resources
137	* are already locked by another card. It can be called in any context	142	* are already locked by another card. It can be called in any context
138	*/	143	*/
139		144
140	#if defined(CONFIG_VGA_ARB)	145	#if defined(CONFIG_VGA_ARB)
141	extern int vga_tryget(struct pci_dev *pdev, unsigned int rsrc);	146	extern int vga_tryget(struct pci_dev *pdev, unsigned int rsrc);
142	#else	147	#else
143	static inline int vga_tryget(struct pci_dev *pdev, unsigned int rsrc) { return 0; }	148	static inline int vga_tryget(struct pci_dev *pdev, unsigned int rsrc) { return 0; }
144	#endif	149	#endif
145		150
146	/**	151	/**
147	* vga_put - release lock on legacy VGA resources	152	* vga_put - release lock on legacy VGA resources
148	*	153	*
149	* @pdev: pci device of VGA card or NULL for system default	154	* @pdev: pci device of VGA card or NULL for system default
150	* @rsrc: but mask of resource to release	155	* @rsrc: but mask of resource to release
151	*	156	*
152	* This function releases resources previously locked by vga_get()	157	* This function releases resources previously locked by vga_get()
153	* or vga_tryget(). The resources aren't disabled right away, so	158	* or vga_tryget(). The resources aren't disabled right away, so
154	* that a subsequence vga_get() on the same card will succeed	159	* that a subsequence vga_get() on the same card will succeed
155	* immediately. Resources have a counter, so locks are only	160	* immediately. Resources have a counter, so locks are only
156	* released if the counter reaches 0.	161	* released if the counter reaches 0.
157	*/	162	*/
158		163
159	#if defined(CONFIG_VGA_ARB)	164	#if defined(CONFIG_VGA_ARB)
160	extern void vga_put(struct pci_dev *pdev, unsigned int rsrc);	165	extern void vga_put(struct pci_dev *pdev, unsigned int rsrc);
161	#else	166	#else
162	#define vga_put(pdev, rsrc)	167	#define vga_put(pdev, rsrc)
163	#endif	168	#endif
164		169
165		170
166	/**	171	/**
167	* vga_default_device	172	* vga_default_device
168	*	173	*
169	* This can be defined by the platform. The default implementation	174	* This can be defined by the platform. The default implementation
170	* is rather dumb and will probably only work properly on single	175	* is rather dumb and will probably only work properly on single
171	* vga card setups and/or x86 platforms.	176	* vga card setups and/or x86 platforms.
172	*	177	*
173	* If your VGA default device is not PCI, you'll have to return	178	* If your VGA default device is not PCI, you'll have to return
174	* NULL here. In this case, I assume it will not conflict with	179	* NULL here. In this case, I assume it will not conflict with
175	* any PCI card. If this is not true, I'll have to define two archs	180	* any PCI card. If this is not true, I'll have to define two archs
176	* hooks for enabling/disabling the VGA default device if that is	181	* hooks for enabling/disabling the VGA default device if that is
177	* possible. This may be a problem with real _ISA_ VGA cards, in	182	* possible. This may be a problem with real _ISA_ VGA cards, in
178	* addition to a PCI one. I don't know at this point how to deal	183	* addition to a PCI one. I don't know at this point how to deal
179	* with that card. Can theirs IOs be disabled at all ? If not, then	184	* with that card. Can theirs IOs be disabled at all ? If not, then
180	* I suppose it's a matter of having the proper arch hook telling	185	* I suppose it's a matter of having the proper arch hook telling
181	* us about it, so we basically never allow anybody to succeed a	186	* us about it, so we basically never allow anybody to succeed a
182	* vga_get()...	187	* vga_get()...
183	*/	188	*/
184		189
185	#ifdef CONFIG_VGA_ARB	190	#ifdef CONFIG_VGA_ARB
186	extern struct pci_dev *vga_default_device(void);	191	extern struct pci_dev *vga_default_device(void);
187	extern void vga_set_default_device(struct pci_dev *pdev);	192	extern void vga_set_default_device(struct pci_dev *pdev);
188	#else	193	#else
189	static inline struct pci_dev *vga_default_device(void) { return NULL; };	194	static inline struct pci_dev *vga_default_device(void) { return NULL; };
190	static inline void vga_set_default_device(struct pci_dev *pdev) { };	195	static inline void vga_set_default_device(struct pci_dev *pdev) { };
191	#endif	196	#endif
192		197
193	/**	198	/**
194	* vga_conflicts	199	* vga_conflicts
195	*	200	*
196	* Architectures should define this if they have several	201	* Architectures should define this if they have several
197	* independent PCI domains that can afford concurrent VGA	202	* independent PCI domains that can afford concurrent VGA
198	* decoding	203	* decoding
199	*/	204	*/
200		205
201	#ifndef __ARCH_HAS_VGA_CONFLICT	206	#ifndef __ARCH_HAS_VGA_CONFLICT
202	static inline int vga_conflicts(struct pci_dev p1, struct pci_dev p2)	207	static inline int vga_conflicts(struct pci_dev p1, struct pci_dev p2)
203	{	208	{
204	return 1;	209	return 1;
205	}	210	}
206	#endif	211	#endif
207		212
208	/**	213	/**
209	* vga_client_register	214	* vga_client_register
210	*	215	*
211	* @pdev: pci device of the VGA client	216	* @pdev: pci device of the VGA client
212	* @cookie: client cookie to be used in callbacks	217	* @cookie: client cookie to be used in callbacks
213	* @irq_set_state: irq state change callback	218	* @irq_set_state: irq state change callback
214	* @set_vga_decode: vga decode change callback	219	* @set_vga_decode: vga decode change callback
215	*	220	*
216	* return value: 0 on success, -1 on failure	221	* return value: 0 on success, -1 on failure
217	* Register a client with the VGA arbitration logic	222	* Register a client with the VGA arbitration logic
218	*	223	*
219	* Clients have two callback mechanisms they can use.	224	* Clients have two callback mechanisms they can use.
220	* irq enable/disable callback -	225	* irq enable/disable callback -
221	* If a client can't disable its GPUs VGA resources, then we	226	* If a client can't disable its GPUs VGA resources, then we
222	* need to be able to ask it to turn off its irqs when we	227	* need to be able to ask it to turn off its irqs when we
223	* turn off its mem and io decoding.	228	* turn off its mem and io decoding.
224	* set_vga_decode	229	* set_vga_decode
225	* If a client can disable its GPU VGA resource, it will	230	* If a client can disable its GPU VGA resource, it will
226	* get a callback from this to set the encode/decode state	231	* get a callback from this to set the encode/decode state
227	*	232	*
228	* Rationale: we cannot disable VGA decode resources unconditionally	233	* Rationale: we cannot disable VGA decode resources unconditionally
229	* some single GPU laptops seem to require ACPI or BIOS access to the	234	* some single GPU laptops seem to require ACPI or BIOS access to the
230	* VGA registers to control things like backlights etc.	235	* VGA registers to control things like backlights etc.
231	* Hopefully newer multi-GPU laptops do something saner, and desktops	236	* Hopefully newer multi-GPU laptops do something saner, and desktops
232	* won't have any special ACPI for this.	237	* won't have any special ACPI for this.
233	* They driver will get a callback when VGA arbitration is first used	238	* They driver will get a callback when VGA arbitration is first used
234	* by userspace since we some older X servers have issues.	239	* by userspace since we some older X servers have issues.
235	*/	240	*/
236	#if defined(CONFIG_VGA_ARB)	241	#if defined(CONFIG_VGA_ARB)
237	int vga_client_register(struct pci_dev pdev, void cookie,	242	int vga_client_register(struct pci_dev pdev, void cookie,
238	void (irq_set_state)(void cookie, bool state),	243	void (irq_set_state)(void cookie, bool state),
239	unsigned int (set_vga_decode)(void cookie, bool state));	244	unsigned int (set_vga_decode)(void cookie, bool state));
240	#else	245	#else
241	static inline int vga_client_register(struct pci_dev pdev, void cookie,	246	static inline int vga_client_register(struct pci_dev pdev, void cookie,
242	void (irq_set_state)(void cookie, bool state),	247	void (irq_set_state)(void cookie, bool state),
243	unsigned int (set_vga_decode)(void cookie, bool state))	248	unsigned int (set_vga_decode)(void cookie, bool state))
244	{	249	{
245	return 0;	250	return 0;
246	}	251	}
247	#endif	252	#endif
248		253
249	#endif /* LINUX_VGA_H */	254	#endif /* LINUX_VGA_H */