Commit | Line | Data |
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deb2d2ec | 1 | /* |
c0db9cbc | 2 | * vgaarb.c: Implements the VGA arbitration. For details refer to |
5fb94e9c | 3 | * Documentation/gpu/vgaarbiter.rst |
c0db9cbc | 4 | * |
deb2d2ec BH |
5 | * |
6 | * (C) Copyright 2005 Benjamin Herrenschmidt <benh@kernel.crashing.org> | |
7 | * (C) Copyright 2007 Paulo R. Zanoni <przanoni@gmail.com> | |
8 | * (C) Copyright 2007, 2009 Tiago Vignatti <vignatti@freedesktop.org> | |
9 | * | |
c0db9cbc TV |
10 | * Permission is hereby granted, free of charge, to any person obtaining a |
11 | * copy of this software and associated documentation files (the "Software"), | |
12 | * to deal in the Software without restriction, including without limitation | |
13 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, | |
14 | * and/or sell copies of the Software, and to permit persons to whom the | |
15 | * Software is furnished to do so, subject to the following conditions: | |
16 | * | |
17 | * The above copyright notice and this permission notice (including the next | |
18 | * paragraph) shall be included in all copies or substantial portions of the | |
19 | * Software. | |
20 | * | |
21 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
22 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
23 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
24 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
25 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING | |
26 | * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER | |
27 | * DEALINGS | |
28 | * IN THE SOFTWARE. | |
29 | * | |
deb2d2ec BH |
30 | */ |
31 | ||
8b7e2e86 TR |
32 | #define pr_fmt(fmt) "vgaarb: " fmt |
33 | ||
a75d68f6 BH |
34 | #define vgaarb_dbg(dev, fmt, arg...) dev_dbg(dev, "vgaarb: " fmt, ##arg) |
35 | #define vgaarb_info(dev, fmt, arg...) dev_info(dev, "vgaarb: " fmt, ##arg) | |
36 | #define vgaarb_err(dev, fmt, arg...) dev_err(dev, "vgaarb: " fmt, ##arg) | |
37 | ||
deb2d2ec BH |
38 | #include <linux/module.h> |
39 | #include <linux/kernel.h> | |
40 | #include <linux/pci.h> | |
41 | #include <linux/errno.h> | |
42 | #include <linux/init.h> | |
43 | #include <linux/list.h> | |
174cd4b1 | 44 | #include <linux/sched/signal.h> |
deb2d2ec BH |
45 | #include <linux/wait.h> |
46 | #include <linux/spinlock.h> | |
47 | #include <linux/poll.h> | |
48 | #include <linux/miscdevice.h> | |
5a0e3ad6 | 49 | #include <linux/slab.h> |
86fd887b | 50 | #include <linux/screen_info.h> |
c6b38fbb GH |
51 | #include <linux/vt.h> |
52 | #include <linux/console.h> | |
deb2d2ec BH |
53 | |
54 | #include <linux/uaccess.h> | |
55 | ||
56 | #include <linux/vgaarb.h> | |
57 | ||
58 | static void vga_arbiter_notify_clients(void); | |
59 | /* | |
60 | * We keep a list of all vga devices in the system to speed | |
61 | * up the various operations of the arbiter | |
62 | */ | |
63 | struct vga_device { | |
64 | struct list_head list; | |
65 | struct pci_dev *pdev; | |
66 | unsigned int decodes; /* what does it decodes */ | |
67 | unsigned int owns; /* what does it owns */ | |
68 | unsigned int locks; /* what does it locks */ | |
69 | unsigned int io_lock_cnt; /* legacy IO lock count */ | |
70 | unsigned int mem_lock_cnt; /* legacy MEM lock count */ | |
71 | unsigned int io_norm_cnt; /* normal IO count */ | |
72 | unsigned int mem_norm_cnt; /* normal MEM count */ | |
3448a19d | 73 | bool bridge_has_one_vga; |
deb2d2ec BH |
74 | /* allow IRQ enable/disable hook */ |
75 | void *cookie; | |
76 | void (*irq_set_state)(void *cookie, bool enable); | |
77 | unsigned int (*set_vga_decode)(void *cookie, bool decode); | |
78 | }; | |
79 | ||
80 | static LIST_HEAD(vga_list); | |
81 | static int vga_count, vga_decode_count; | |
82 | static bool vga_arbiter_used; | |
83 | static DEFINE_SPINLOCK(vga_lock); | |
84 | static DECLARE_WAIT_QUEUE_HEAD(vga_wait_queue); | |
85 | ||
86 | ||
87 | static const char *vga_iostate_to_str(unsigned int iostate) | |
88 | { | |
89 | /* Ignore VGA_RSRC_IO and VGA_RSRC_MEM */ | |
90 | iostate &= VGA_RSRC_LEGACY_IO | VGA_RSRC_LEGACY_MEM; | |
91 | switch (iostate) { | |
92 | case VGA_RSRC_LEGACY_IO | VGA_RSRC_LEGACY_MEM: | |
93 | return "io+mem"; | |
94 | case VGA_RSRC_LEGACY_IO: | |
95 | return "io"; | |
96 | case VGA_RSRC_LEGACY_MEM: | |
97 | return "mem"; | |
98 | } | |
99 | return "none"; | |
100 | } | |
101 | ||
102 | static int vga_str_to_iostate(char *buf, int str_size, int *io_state) | |
103 | { | |
104 | /* we could in theory hand out locks on IO and mem | |
105 | * separately to userspace but it can cause deadlocks */ | |
106 | if (strncmp(buf, "none", 4) == 0) { | |
107 | *io_state = VGA_RSRC_NONE; | |
108 | return 1; | |
109 | } | |
110 | ||
111 | /* XXX We're not chekcing the str_size! */ | |
112 | if (strncmp(buf, "io+mem", 6) == 0) | |
113 | goto both; | |
114 | else if (strncmp(buf, "io", 2) == 0) | |
115 | goto both; | |
116 | else if (strncmp(buf, "mem", 3) == 0) | |
117 | goto both; | |
118 | return 0; | |
119 | both: | |
120 | *io_state = VGA_RSRC_LEGACY_IO | VGA_RSRC_LEGACY_MEM; | |
121 | return 1; | |
122 | } | |
123 | ||
deb2d2ec BH |
124 | /* this is only used a cookie - it should not be dereferenced */ |
125 | static struct pci_dev *vga_default; | |
deb2d2ec BH |
126 | |
127 | static void vga_arb_device_card_gone(struct pci_dev *pdev); | |
128 | ||
129 | /* Find somebody in our list */ | |
130 | static struct vga_device *vgadev_find(struct pci_dev *pdev) | |
131 | { | |
132 | struct vga_device *vgadev; | |
133 | ||
134 | list_for_each_entry(vgadev, &vga_list, list) | |
135 | if (pdev == vgadev->pdev) | |
136 | return vgadev; | |
137 | return NULL; | |
138 | } | |
139 | ||
b754b35b DV |
140 | /** |
141 | * vga_default_device - return the default VGA device, for vgacon | |
142 | * | |
143 | * This can be defined by the platform. The default implementation | |
144 | * is rather dumb and will probably only work properly on single | |
145 | * vga card setups and/or x86 platforms. | |
146 | * | |
147 | * If your VGA default device is not PCI, you'll have to return | |
148 | * NULL here. In this case, I assume it will not conflict with | |
149 | * any PCI card. If this is not true, I'll have to define two archs | |
150 | * hooks for enabling/disabling the VGA default device if that is | |
151 | * possible. This may be a problem with real _ISA_ VGA cards, in | |
152 | * addition to a PCI one. I don't know at this point how to deal | |
153 | * with that card. Can theirs IOs be disabled at all ? If not, then | |
154 | * I suppose it's a matter of having the proper arch hook telling | |
155 | * us about it, so we basically never allow anybody to succeed a | |
156 | * vga_get()... | |
157 | */ | |
deb2d2ec BH |
158 | struct pci_dev *vga_default_device(void) |
159 | { | |
160 | return vga_default; | |
161 | } | |
1b23170a MG |
162 | EXPORT_SYMBOL_GPL(vga_default_device); |
163 | ||
1a39b310 MG |
164 | void vga_set_default_device(struct pci_dev *pdev) |
165 | { | |
84544a1d YL |
166 | if (vga_default == pdev) |
167 | return; | |
168 | ||
169 | pci_dev_put(vga_default); | |
170 | vga_default = pci_dev_get(pdev); | |
1a39b310 | 171 | } |
deb2d2ec | 172 | |
c6b38fbb GH |
173 | /** |
174 | * vga_remove_vgacon - deactivete vga console | |
175 | * | |
176 | * Unbind and unregister vgacon in case pdev is the default vga | |
177 | * device. Can be called by gpu drivers on initialization to make | |
178 | * sure vga register access done by vgacon will not disturb the | |
179 | * device. | |
180 | * | |
181 | * @pdev: pci device. | |
182 | */ | |
183 | #if !defined(CONFIG_VGA_CONSOLE) | |
184 | int vga_remove_vgacon(struct pci_dev *pdev) | |
185 | { | |
186 | return 0; | |
187 | } | |
188 | #elif !defined(CONFIG_DUMMY_CONSOLE) | |
189 | int vga_remove_vgacon(struct pci_dev *pdev) | |
190 | { | |
191 | return -ENODEV; | |
192 | } | |
193 | #else | |
194 | int vga_remove_vgacon(struct pci_dev *pdev) | |
195 | { | |
196 | int ret = 0; | |
197 | ||
198 | if (pdev != vga_default) | |
199 | return 0; | |
200 | vgaarb_info(&pdev->dev, "deactivate vga console\n"); | |
201 | ||
202 | console_lock(); | |
203 | if (con_is_bound(&vga_con)) | |
204 | ret = do_take_over_console(&dummy_con, 0, | |
205 | MAX_NR_CONSOLES - 1, 1); | |
206 | if (ret == 0) { | |
207 | ret = do_unregister_con_driver(&vga_con); | |
208 | ||
209 | /* Ignore "already unregistered". */ | |
210 | if (ret == -ENODEV) | |
211 | ret = 0; | |
212 | } | |
213 | console_unlock(); | |
214 | ||
215 | return ret; | |
216 | } | |
217 | #endif | |
218 | EXPORT_SYMBOL(vga_remove_vgacon); | |
219 | ||
deb2d2ec BH |
220 | static inline void vga_irq_set_state(struct vga_device *vgadev, bool state) |
221 | { | |
222 | if (vgadev->irq_set_state) | |
223 | vgadev->irq_set_state(vgadev->cookie, state); | |
224 | } | |
225 | ||
226 | ||
227 | /* If we don't ever use VGA arb we should avoid | |
228 | turning off anything anywhere due to old X servers getting | |
229 | confused about the boot device not being VGA */ | |
230 | static void vga_check_first_use(void) | |
231 | { | |
232 | /* we should inform all GPUs in the system that | |
25985edc | 233 | * VGA arb has occurred and to try and disable resources |
deb2d2ec BH |
234 | * if they can */ |
235 | if (!vga_arbiter_used) { | |
236 | vga_arbiter_used = true; | |
237 | vga_arbiter_notify_clients(); | |
238 | } | |
239 | } | |
240 | ||
241 | static struct vga_device *__vga_tryget(struct vga_device *vgadev, | |
242 | unsigned int rsrc) | |
243 | { | |
a75d68f6 | 244 | struct device *dev = &vgadev->pdev->dev; |
deb2d2ec BH |
245 | unsigned int wants, legacy_wants, match; |
246 | struct vga_device *conflict; | |
247 | unsigned int pci_bits; | |
3448a19d DA |
248 | u32 flags = 0; |
249 | ||
deb2d2ec BH |
250 | /* Account for "normal" resources to lock. If we decode the legacy, |
251 | * counterpart, we need to request it as well | |
252 | */ | |
253 | if ((rsrc & VGA_RSRC_NORMAL_IO) && | |
254 | (vgadev->decodes & VGA_RSRC_LEGACY_IO)) | |
255 | rsrc |= VGA_RSRC_LEGACY_IO; | |
256 | if ((rsrc & VGA_RSRC_NORMAL_MEM) && | |
257 | (vgadev->decodes & VGA_RSRC_LEGACY_MEM)) | |
258 | rsrc |= VGA_RSRC_LEGACY_MEM; | |
259 | ||
a75d68f6 BH |
260 | vgaarb_dbg(dev, "%s: %d\n", __func__, rsrc); |
261 | vgaarb_dbg(dev, "%s: owns: %d\n", __func__, vgadev->owns); | |
deb2d2ec BH |
262 | |
263 | /* Check what resources we need to acquire */ | |
264 | wants = rsrc & ~vgadev->owns; | |
265 | ||
266 | /* We already own everything, just mark locked & bye bye */ | |
267 | if (wants == 0) | |
268 | goto lock_them; | |
269 | ||
270 | /* We don't need to request a legacy resource, we just enable | |
271 | * appropriate decoding and go | |
272 | */ | |
273 | legacy_wants = wants & VGA_RSRC_LEGACY_MASK; | |
274 | if (legacy_wants == 0) | |
275 | goto enable_them; | |
276 | ||
277 | /* Ok, we don't, let's find out how we need to kick off */ | |
278 | list_for_each_entry(conflict, &vga_list, list) { | |
279 | unsigned int lwants = legacy_wants; | |
280 | unsigned int change_bridge = 0; | |
281 | ||
282 | /* Don't conflict with myself */ | |
283 | if (vgadev == conflict) | |
284 | continue; | |
285 | ||
286 | /* Check if the architecture allows a conflict between those | |
287 | * 2 devices or if they are on separate domains | |
288 | */ | |
289 | if (!vga_conflicts(vgadev->pdev, conflict->pdev)) | |
290 | continue; | |
291 | ||
292 | /* We have a possible conflict. before we go further, we must | |
293 | * check if we sit on the same bus as the conflicting device. | |
294 | * if we don't, then we must tie both IO and MEM resources | |
295 | * together since there is only a single bit controlling | |
296 | * VGA forwarding on P2P bridges | |
297 | */ | |
298 | if (vgadev->pdev->bus != conflict->pdev->bus) { | |
299 | change_bridge = 1; | |
300 | lwants = VGA_RSRC_LEGACY_IO | VGA_RSRC_LEGACY_MEM; | |
301 | } | |
302 | ||
303 | /* Check if the guy has a lock on the resource. If he does, | |
304 | * return the conflicting entry | |
305 | */ | |
306 | if (conflict->locks & lwants) | |
307 | return conflict; | |
308 | ||
4e4e7dc5 AW |
309 | /* Ok, now check if it owns the resource we want. We can |
310 | * lock resources that are not decoded, therefore a device | |
311 | * can own resources it doesn't decode. | |
deb2d2ec | 312 | */ |
deb2d2ec BH |
313 | match = lwants & conflict->owns; |
314 | if (!match) | |
315 | continue; | |
316 | ||
317 | /* looks like he doesn't have a lock, we can steal | |
318 | * them from him | |
319 | */ | |
deb2d2ec | 320 | |
3448a19d | 321 | flags = 0; |
deb2d2ec | 322 | pci_bits = 0; |
deb2d2ec | 323 | |
4e4e7dc5 AW |
324 | /* If we can't control legacy resources via the bridge, we |
325 | * also need to disable normal decoding. | |
326 | */ | |
3448a19d | 327 | if (!conflict->bridge_has_one_vga) { |
4e4e7dc5 | 328 | if ((match & conflict->decodes) & VGA_RSRC_LEGACY_MEM) |
3448a19d | 329 | pci_bits |= PCI_COMMAND_MEMORY; |
4e4e7dc5 | 330 | if ((match & conflict->decodes) & VGA_RSRC_LEGACY_IO) |
3448a19d | 331 | pci_bits |= PCI_COMMAND_IO; |
4e4e7dc5 AW |
332 | |
333 | if (pci_bits) { | |
334 | vga_irq_set_state(conflict, false); | |
335 | flags |= PCI_VGA_STATE_CHANGE_DECODES; | |
336 | } | |
3448a19d DA |
337 | } |
338 | ||
339 | if (change_bridge) | |
340 | flags |= PCI_VGA_STATE_CHANGE_BRIDGE; | |
341 | ||
342 | pci_set_vga_state(conflict->pdev, false, pci_bits, flags); | |
f22d776f | 343 | conflict->owns &= ~match; |
4e4e7dc5 AW |
344 | |
345 | /* If we disabled normal decoding, reflect it in owns */ | |
346 | if (pci_bits & PCI_COMMAND_MEMORY) | |
deb2d2ec | 347 | conflict->owns &= ~VGA_RSRC_NORMAL_MEM; |
4e4e7dc5 | 348 | if (pci_bits & PCI_COMMAND_IO) |
deb2d2ec BH |
349 | conflict->owns &= ~VGA_RSRC_NORMAL_IO; |
350 | } | |
351 | ||
352 | enable_them: | |
353 | /* ok dude, we got it, everybody conflicting has been disabled, let's | |
4e4e7dc5 AW |
354 | * enable us. Mark any bits in "owns" regardless of whether we |
355 | * decoded them. We can lock resources we don't decode, therefore | |
356 | * we must track them via "owns". | |
deb2d2ec | 357 | */ |
3448a19d | 358 | flags = 0; |
deb2d2ec | 359 | pci_bits = 0; |
deb2d2ec | 360 | |
3448a19d DA |
361 | if (!vgadev->bridge_has_one_vga) { |
362 | flags |= PCI_VGA_STATE_CHANGE_DECODES; | |
363 | if (wants & (VGA_RSRC_LEGACY_MEM|VGA_RSRC_NORMAL_MEM)) | |
364 | pci_bits |= PCI_COMMAND_MEMORY; | |
365 | if (wants & (VGA_RSRC_LEGACY_IO|VGA_RSRC_NORMAL_IO)) | |
366 | pci_bits |= PCI_COMMAND_IO; | |
367 | } | |
4e4e7dc5 | 368 | if (wants & VGA_RSRC_LEGACY_MASK) |
3448a19d DA |
369 | flags |= PCI_VGA_STATE_CHANGE_BRIDGE; |
370 | ||
371 | pci_set_vga_state(vgadev->pdev, true, pci_bits, flags); | |
372 | ||
5d90ccf9 | 373 | if (!vgadev->bridge_has_one_vga) |
3448a19d | 374 | vga_irq_set_state(vgadev, true); |
5d90ccf9 | 375 | |
4e4e7dc5 | 376 | vgadev->owns |= wants; |
deb2d2ec BH |
377 | lock_them: |
378 | vgadev->locks |= (rsrc & VGA_RSRC_LEGACY_MASK); | |
379 | if (rsrc & VGA_RSRC_LEGACY_IO) | |
380 | vgadev->io_lock_cnt++; | |
381 | if (rsrc & VGA_RSRC_LEGACY_MEM) | |
382 | vgadev->mem_lock_cnt++; | |
383 | if (rsrc & VGA_RSRC_NORMAL_IO) | |
384 | vgadev->io_norm_cnt++; | |
385 | if (rsrc & VGA_RSRC_NORMAL_MEM) | |
386 | vgadev->mem_norm_cnt++; | |
387 | ||
388 | return NULL; | |
389 | } | |
390 | ||
391 | static void __vga_put(struct vga_device *vgadev, unsigned int rsrc) | |
392 | { | |
a75d68f6 | 393 | struct device *dev = &vgadev->pdev->dev; |
deb2d2ec BH |
394 | unsigned int old_locks = vgadev->locks; |
395 | ||
a75d68f6 | 396 | vgaarb_dbg(dev, "%s\n", __func__); |
deb2d2ec BH |
397 | |
398 | /* Update our counters, and account for equivalent legacy resources | |
399 | * if we decode them | |
400 | */ | |
401 | if ((rsrc & VGA_RSRC_NORMAL_IO) && vgadev->io_norm_cnt > 0) { | |
402 | vgadev->io_norm_cnt--; | |
403 | if (vgadev->decodes & VGA_RSRC_LEGACY_IO) | |
404 | rsrc |= VGA_RSRC_LEGACY_IO; | |
405 | } | |
406 | if ((rsrc & VGA_RSRC_NORMAL_MEM) && vgadev->mem_norm_cnt > 0) { | |
407 | vgadev->mem_norm_cnt--; | |
408 | if (vgadev->decodes & VGA_RSRC_LEGACY_MEM) | |
409 | rsrc |= VGA_RSRC_LEGACY_MEM; | |
410 | } | |
411 | if ((rsrc & VGA_RSRC_LEGACY_IO) && vgadev->io_lock_cnt > 0) | |
412 | vgadev->io_lock_cnt--; | |
413 | if ((rsrc & VGA_RSRC_LEGACY_MEM) && vgadev->mem_lock_cnt > 0) | |
414 | vgadev->mem_lock_cnt--; | |
415 | ||
416 | /* Just clear lock bits, we do lazy operations so we don't really | |
417 | * have to bother about anything else at this point | |
418 | */ | |
419 | if (vgadev->io_lock_cnt == 0) | |
420 | vgadev->locks &= ~VGA_RSRC_LEGACY_IO; | |
421 | if (vgadev->mem_lock_cnt == 0) | |
422 | vgadev->locks &= ~VGA_RSRC_LEGACY_MEM; | |
423 | ||
424 | /* Kick the wait queue in case somebody was waiting if we actually | |
425 | * released something | |
426 | */ | |
427 | if (old_locks != vgadev->locks) | |
428 | wake_up_all(&vga_wait_queue); | |
429 | } | |
430 | ||
b754b35b DV |
431 | /** |
432 | * vga_get - acquire & locks VGA resources | |
433 | * @pdev: pci device of the VGA card or NULL for the system default | |
434 | * @rsrc: bit mask of resources to acquire and lock | |
435 | * @interruptible: blocking should be interruptible by signals ? | |
436 | * | |
437 | * This function acquires VGA resources for the given card and mark those | |
438 | * resources locked. If the resource requested are "normal" (and not legacy) | |
439 | * resources, the arbiter will first check whether the card is doing legacy | |
440 | * decoding for that type of resource. If yes, the lock is "converted" into a | |
441 | * legacy resource lock. | |
442 | * | |
443 | * The arbiter will first look for all VGA cards that might conflict and disable | |
444 | * their IOs and/or Memory access, including VGA forwarding on P2P bridges if | |
445 | * necessary, so that the requested resources can be used. Then, the card is | |
446 | * marked as locking these resources and the IO and/or Memory accesses are | |
447 | * enabled on the card (including VGA forwarding on parent P2P bridges if any). | |
448 | * | |
449 | * This function will block if some conflicting card is already locking one of | |
450 | * the required resources (or any resource on a different bus segment, since P2P | |
451 | * bridges don't differentiate VGA memory and IO afaik). You can indicate | |
452 | * whether this blocking should be interruptible by a signal (for userland | |
453 | * interface) or not. | |
454 | * | |
455 | * Must not be called at interrupt time or in atomic context. If the card | |
456 | * already owns the resources, the function succeeds. Nested calls are | |
457 | * supported (a per-resource counter is maintained) | |
458 | * | |
459 | * On success, release the VGA resource again with vga_put(). | |
460 | * | |
461 | * Returns: | |
462 | * | |
463 | * 0 on success, negative error code on failure. | |
464 | */ | |
deb2d2ec BH |
465 | int vga_get(struct pci_dev *pdev, unsigned int rsrc, int interruptible) |
466 | { | |
467 | struct vga_device *vgadev, *conflict; | |
468 | unsigned long flags; | |
ac6424b9 | 469 | wait_queue_entry_t wait; |
deb2d2ec BH |
470 | int rc = 0; |
471 | ||
472 | vga_check_first_use(); | |
473 | /* The one who calls us should check for this, but lets be sure... */ | |
474 | if (pdev == NULL) | |
475 | pdev = vga_default_device(); | |
476 | if (pdev == NULL) | |
477 | return 0; | |
478 | ||
479 | for (;;) { | |
480 | spin_lock_irqsave(&vga_lock, flags); | |
481 | vgadev = vgadev_find(pdev); | |
482 | if (vgadev == NULL) { | |
483 | spin_unlock_irqrestore(&vga_lock, flags); | |
484 | rc = -ENODEV; | |
485 | break; | |
486 | } | |
487 | conflict = __vga_tryget(vgadev, rsrc); | |
488 | spin_unlock_irqrestore(&vga_lock, flags); | |
489 | if (conflict == NULL) | |
490 | break; | |
491 | ||
492 | ||
493 | /* We have a conflict, we wait until somebody kicks the | |
494 | * work queue. Currently we have one work queue that we | |
495 | * kick each time some resources are released, but it would | |
496 | * be fairly easy to have a per device one so that we only | |
497 | * need to attach to the conflicting device | |
498 | */ | |
499 | init_waitqueue_entry(&wait, current); | |
500 | add_wait_queue(&vga_wait_queue, &wait); | |
501 | set_current_state(interruptible ? | |
502 | TASK_INTERRUPTIBLE : | |
503 | TASK_UNINTERRUPTIBLE); | |
9f5bd308 KS |
504 | if (interruptible && signal_pending(current)) { |
505 | __set_current_state(TASK_RUNNING); | |
506 | remove_wait_queue(&vga_wait_queue, &wait); | |
507 | rc = -ERESTARTSYS; | |
deb2d2ec BH |
508 | break; |
509 | } | |
510 | schedule(); | |
511 | remove_wait_queue(&vga_wait_queue, &wait); | |
deb2d2ec BH |
512 | } |
513 | return rc; | |
514 | } | |
515 | EXPORT_SYMBOL(vga_get); | |
516 | ||
b754b35b DV |
517 | /** |
518 | * vga_tryget - try to acquire & lock legacy VGA resources | |
519 | * @pdev: pci devivce of VGA card or NULL for system default | |
520 | * @rsrc: bit mask of resources to acquire and lock | |
521 | * | |
522 | * This function performs the same operation as vga_get(), but will return an | |
523 | * error (-EBUSY) instead of blocking if the resources are already locked by | |
524 | * another card. It can be called in any context | |
525 | * | |
526 | * On success, release the VGA resource again with vga_put(). | |
527 | * | |
528 | * Returns: | |
529 | * | |
530 | * 0 on success, negative error code on failure. | |
531 | */ | |
f369bc3f | 532 | static int vga_tryget(struct pci_dev *pdev, unsigned int rsrc) |
deb2d2ec BH |
533 | { |
534 | struct vga_device *vgadev; | |
535 | unsigned long flags; | |
536 | int rc = 0; | |
537 | ||
538 | vga_check_first_use(); | |
539 | ||
540 | /* The one who calls us should check for this, but lets be sure... */ | |
541 | if (pdev == NULL) | |
542 | pdev = vga_default_device(); | |
543 | if (pdev == NULL) | |
544 | return 0; | |
545 | spin_lock_irqsave(&vga_lock, flags); | |
546 | vgadev = vgadev_find(pdev); | |
547 | if (vgadev == NULL) { | |
548 | rc = -ENODEV; | |
549 | goto bail; | |
550 | } | |
551 | if (__vga_tryget(vgadev, rsrc)) | |
552 | rc = -EBUSY; | |
553 | bail: | |
554 | spin_unlock_irqrestore(&vga_lock, flags); | |
555 | return rc; | |
556 | } | |
deb2d2ec | 557 | |
b754b35b DV |
558 | /** |
559 | * vga_put - release lock on legacy VGA resources | |
560 | * @pdev: pci device of VGA card or NULL for system default | |
561 | * @rsrc: but mask of resource to release | |
562 | * | |
563 | * This fuction releases resources previously locked by vga_get() or | |
564 | * vga_tryget(). The resources aren't disabled right away, so that a subsequence | |
565 | * vga_get() on the same card will succeed immediately. Resources have a | |
566 | * counter, so locks are only released if the counter reaches 0. | |
567 | */ | |
deb2d2ec BH |
568 | void vga_put(struct pci_dev *pdev, unsigned int rsrc) |
569 | { | |
570 | struct vga_device *vgadev; | |
571 | unsigned long flags; | |
572 | ||
573 | /* The one who calls us should check for this, but lets be sure... */ | |
574 | if (pdev == NULL) | |
575 | pdev = vga_default_device(); | |
576 | if (pdev == NULL) | |
577 | return; | |
578 | spin_lock_irqsave(&vga_lock, flags); | |
579 | vgadev = vgadev_find(pdev); | |
580 | if (vgadev == NULL) | |
581 | goto bail; | |
582 | __vga_put(vgadev, rsrc); | |
583 | bail: | |
584 | spin_unlock_irqrestore(&vga_lock, flags); | |
585 | } | |
586 | EXPORT_SYMBOL(vga_put); | |
587 | ||
5d90ccf9 TR |
588 | /* |
589 | * Rules for using a bridge to control a VGA descendant decoding: if a bridge | |
590 | * has only one VGA descendant then it can be used to control the VGA routing | |
591 | * for that device. It should always use the bridge closest to the device to | |
592 | * control it. If a bridge has a direct VGA descendant, but also have a sub- | |
593 | * bridge VGA descendant then we cannot use that bridge to control the direct | |
594 | * VGA descendant. So for every device we register, we need to iterate all | |
595 | * its parent bridges so we can invalidate any devices using them properly. | |
596 | */ | |
3448a19d DA |
597 | static void vga_arbiter_check_bridge_sharing(struct vga_device *vgadev) |
598 | { | |
599 | struct vga_device *same_bridge_vgadev; | |
600 | struct pci_bus *new_bus, *bus; | |
601 | struct pci_dev *new_bridge, *bridge; | |
602 | ||
603 | vgadev->bridge_has_one_vga = true; | |
604 | ||
605 | if (list_empty(&vga_list)) | |
606 | return; | |
607 | ||
608 | /* okay iterate the new devices bridge hierarachy */ | |
609 | new_bus = vgadev->pdev->bus; | |
610 | while (new_bus) { | |
611 | new_bridge = new_bus->self; | |
612 | ||
f6252114 DA |
613 | /* go through list of devices already registered */ |
614 | list_for_each_entry(same_bridge_vgadev, &vga_list, list) { | |
615 | bus = same_bridge_vgadev->pdev->bus; | |
616 | bridge = bus->self; | |
617 | ||
618 | /* see if the share a bridge with this device */ | |
619 | if (new_bridge == bridge) { | |
5d90ccf9 TR |
620 | /* |
621 | * If their direct parent bridge is the same | |
622 | * as any bridge of this device then it can't | |
623 | * be used for that device. | |
624 | */ | |
f6252114 DA |
625 | same_bridge_vgadev->bridge_has_one_vga = false; |
626 | } | |
3448a19d | 627 | |
5d90ccf9 TR |
628 | /* |
629 | * Now iterate the previous devices bridge hierarchy. | |
630 | * If the new devices parent bridge is in the other | |
631 | * devices hierarchy then we can't use it to control | |
632 | * this device | |
633 | */ | |
f6252114 DA |
634 | while (bus) { |
635 | bridge = bus->self; | |
5d90ccf9 TR |
636 | |
637 | if (bridge && bridge == vgadev->pdev->bus->self) | |
638 | vgadev->bridge_has_one_vga = false; | |
639 | ||
f6252114 | 640 | bus = bus->parent; |
3448a19d DA |
641 | } |
642 | } | |
643 | new_bus = new_bus->parent; | |
644 | } | |
645 | } | |
646 | ||
deb2d2ec BH |
647 | /* |
648 | * Currently, we assume that the "initial" setup of the system is | |
649 | * not sane, that is we come up with conflicting devices and let | |
650 | * the arbiter's client decides if devices decodes or not legacy | |
651 | * things. | |
652 | */ | |
653 | static bool vga_arbiter_add_pci_device(struct pci_dev *pdev) | |
654 | { | |
655 | struct vga_device *vgadev; | |
656 | unsigned long flags; | |
657 | struct pci_bus *bus; | |
658 | struct pci_dev *bridge; | |
659 | u16 cmd; | |
660 | ||
661 | /* Only deal with VGA class devices */ | |
662 | if ((pdev->class >> 8) != PCI_CLASS_DISPLAY_VGA) | |
663 | return false; | |
664 | ||
665 | /* Allocate structure */ | |
945ef5bb | 666 | vgadev = kzalloc(sizeof(struct vga_device), GFP_KERNEL); |
deb2d2ec | 667 | if (vgadev == NULL) { |
a75d68f6 | 668 | vgaarb_err(&pdev->dev, "failed to allocate VGA arbiter data\n"); |
5d90ccf9 TR |
669 | /* |
670 | * What to do on allocation failure ? For now, let's just do | |
671 | * nothing, I'm not sure there is anything saner to be done. | |
deb2d2ec BH |
672 | */ |
673 | return false; | |
674 | } | |
675 | ||
deb2d2ec BH |
676 | /* Take lock & check for duplicates */ |
677 | spin_lock_irqsave(&vga_lock, flags); | |
678 | if (vgadev_find(pdev) != NULL) { | |
679 | BUG_ON(1); | |
680 | goto fail; | |
681 | } | |
682 | vgadev->pdev = pdev; | |
683 | ||
684 | /* By default, assume we decode everything */ | |
685 | vgadev->decodes = VGA_RSRC_LEGACY_IO | VGA_RSRC_LEGACY_MEM | | |
686 | VGA_RSRC_NORMAL_IO | VGA_RSRC_NORMAL_MEM; | |
687 | ||
688 | /* by default mark it as decoding */ | |
689 | vga_decode_count++; | |
690 | /* Mark that we "own" resources based on our enables, we will | |
691 | * clear that below if the bridge isn't forwarding | |
692 | */ | |
693 | pci_read_config_word(pdev, PCI_COMMAND, &cmd); | |
694 | if (cmd & PCI_COMMAND_IO) | |
695 | vgadev->owns |= VGA_RSRC_LEGACY_IO; | |
696 | if (cmd & PCI_COMMAND_MEMORY) | |
697 | vgadev->owns |= VGA_RSRC_LEGACY_MEM; | |
698 | ||
699 | /* Check if VGA cycles can get down to us */ | |
700 | bus = pdev->bus; | |
701 | while (bus) { | |
702 | bridge = bus->self; | |
703 | if (bridge) { | |
704 | u16 l; | |
5d90ccf9 TR |
705 | |
706 | pci_read_config_word(bridge, PCI_BRIDGE_CONTROL, &l); | |
deb2d2ec BH |
707 | if (!(l & PCI_BRIDGE_CTL_VGA)) { |
708 | vgadev->owns = 0; | |
709 | break; | |
710 | } | |
711 | } | |
712 | bus = bus->parent; | |
713 | } | |
714 | ||
715 | /* Deal with VGA default device. Use first enabled one | |
716 | * by default if arch doesn't have it's own hook | |
717 | */ | |
deb2d2ec | 718 | if (vga_default == NULL && |
86fd887b | 719 | ((vgadev->owns & VGA_RSRC_LEGACY_MASK) == VGA_RSRC_LEGACY_MASK)) { |
a75d68f6 | 720 | vgaarb_info(&pdev->dev, "setting as boot VGA device\n"); |
84544a1d | 721 | vga_set_default_device(pdev); |
86fd887b | 722 | } |
deb2d2ec | 723 | |
3448a19d DA |
724 | vga_arbiter_check_bridge_sharing(vgadev); |
725 | ||
deb2d2ec | 726 | /* Add to the list */ |
3d42f1dd | 727 | list_add_tail(&vgadev->list, &vga_list); |
deb2d2ec | 728 | vga_count++; |
a75d68f6 | 729 | vgaarb_info(&pdev->dev, "VGA device added: decodes=%s,owns=%s,locks=%s\n", |
deb2d2ec BH |
730 | vga_iostate_to_str(vgadev->decodes), |
731 | vga_iostate_to_str(vgadev->owns), | |
732 | vga_iostate_to_str(vgadev->locks)); | |
733 | ||
734 | spin_unlock_irqrestore(&vga_lock, flags); | |
735 | return true; | |
736 | fail: | |
737 | spin_unlock_irqrestore(&vga_lock, flags); | |
738 | kfree(vgadev); | |
739 | return false; | |
740 | } | |
741 | ||
742 | static bool vga_arbiter_del_pci_device(struct pci_dev *pdev) | |
743 | { | |
744 | struct vga_device *vgadev; | |
745 | unsigned long flags; | |
746 | bool ret = true; | |
747 | ||
748 | spin_lock_irqsave(&vga_lock, flags); | |
749 | vgadev = vgadev_find(pdev); | |
750 | if (vgadev == NULL) { | |
751 | ret = false; | |
752 | goto bail; | |
753 | } | |
754 | ||
84544a1d YL |
755 | if (vga_default == pdev) |
756 | vga_set_default_device(NULL); | |
deb2d2ec BH |
757 | |
758 | if (vgadev->decodes & (VGA_RSRC_LEGACY_IO | VGA_RSRC_LEGACY_MEM)) | |
759 | vga_decode_count--; | |
760 | ||
761 | /* Remove entry from list */ | |
762 | list_del(&vgadev->list); | |
763 | vga_count--; | |
764 | /* Notify userland driver that the device is gone so it discards | |
765 | * it's copies of the pci_dev pointer | |
766 | */ | |
767 | vga_arb_device_card_gone(pdev); | |
768 | ||
769 | /* Wake up all possible waiters */ | |
770 | wake_up_all(&vga_wait_queue); | |
771 | bail: | |
772 | spin_unlock_irqrestore(&vga_lock, flags); | |
773 | kfree(vgadev); | |
774 | return ret; | |
775 | } | |
776 | ||
777 | /* this is called with the lock */ | |
778 | static inline void vga_update_device_decodes(struct vga_device *vgadev, | |
779 | int new_decodes) | |
780 | { | |
a75d68f6 | 781 | struct device *dev = &vgadev->pdev->dev; |
5c0f6ee7 | 782 | int old_decodes, decodes_removed, decodes_unlocked; |
deb2d2ec BH |
783 | |
784 | old_decodes = vgadev->decodes; | |
5c0f6ee7 AW |
785 | decodes_removed = ~new_decodes & old_decodes; |
786 | decodes_unlocked = vgadev->locks & decodes_removed; | |
deb2d2ec BH |
787 | vgadev->decodes = new_decodes; |
788 | ||
a75d68f6 | 789 | vgaarb_info(dev, "changed VGA decodes: olddecodes=%s,decodes=%s:owns=%s\n", |
deb2d2ec BH |
790 | vga_iostate_to_str(old_decodes), |
791 | vga_iostate_to_str(vgadev->decodes), | |
792 | vga_iostate_to_str(vgadev->owns)); | |
793 | ||
5c0f6ee7 AW |
794 | /* if we removed locked decodes, lock count goes to zero, and release */ |
795 | if (decodes_unlocked) { | |
796 | if (decodes_unlocked & VGA_RSRC_LEGACY_IO) | |
797 | vgadev->io_lock_cnt = 0; | |
798 | if (decodes_unlocked & VGA_RSRC_LEGACY_MEM) | |
799 | vgadev->mem_lock_cnt = 0; | |
800 | __vga_put(vgadev, decodes_unlocked); | |
deb2d2ec BH |
801 | } |
802 | ||
803 | /* change decodes counter */ | |
5c0f6ee7 AW |
804 | if (old_decodes & VGA_RSRC_LEGACY_MASK && |
805 | !(new_decodes & VGA_RSRC_LEGACY_MASK)) | |
806 | vga_decode_count--; | |
807 | if (!(old_decodes & VGA_RSRC_LEGACY_MASK) && | |
808 | new_decodes & VGA_RSRC_LEGACY_MASK) | |
809 | vga_decode_count++; | |
a75d68f6 | 810 | vgaarb_dbg(dev, "decoding count now is: %d\n", vga_decode_count); |
deb2d2ec BH |
811 | } |
812 | ||
5d90ccf9 TR |
813 | static void __vga_set_legacy_decoding(struct pci_dev *pdev, |
814 | unsigned int decodes, | |
815 | bool userspace) | |
deb2d2ec BH |
816 | { |
817 | struct vga_device *vgadev; | |
818 | unsigned long flags; | |
819 | ||
820 | decodes &= VGA_RSRC_LEGACY_MASK; | |
821 | ||
822 | spin_lock_irqsave(&vga_lock, flags); | |
823 | vgadev = vgadev_find(pdev); | |
824 | if (vgadev == NULL) | |
825 | goto bail; | |
826 | ||
827 | /* don't let userspace futz with kernel driver decodes */ | |
828 | if (userspace && vgadev->set_vga_decode) | |
829 | goto bail; | |
830 | ||
831 | /* update the device decodes + counter */ | |
832 | vga_update_device_decodes(vgadev, decodes); | |
833 | ||
834 | /* XXX if somebody is going from "doesn't decode" to "decodes" state | |
835 | * here, additional care must be taken as we may have pending owner | |
836 | * ship of non-legacy region ... | |
837 | */ | |
838 | bail: | |
839 | spin_unlock_irqrestore(&vga_lock, flags); | |
840 | } | |
841 | ||
842 | void vga_set_legacy_decoding(struct pci_dev *pdev, unsigned int decodes) | |
843 | { | |
844 | __vga_set_legacy_decoding(pdev, decodes, false); | |
845 | } | |
846 | EXPORT_SYMBOL(vga_set_legacy_decoding); | |
847 | ||
b754b35b DV |
848 | /** |
849 | * vga_client_register - register or unregister a VGA arbitration client | |
850 | * @pdev: pci device of the VGA client | |
851 | * @cookie: client cookie to be used in callbacks | |
852 | * @irq_set_state: irq state change callback | |
853 | * @set_vga_decode: vga decode change callback | |
854 | * | |
855 | * Clients have two callback mechanisms they can use. | |
856 | * | |
857 | * @irq_set_state callback: If a client can't disable its GPUs VGA | |
858 | * resources, then we need to be able to ask it to turn off its irqs when we | |
859 | * turn off its mem and io decoding. | |
860 | * | |
861 | * @set_vga_decode callback: If a client can disable its GPU VGA resource, it | |
862 | * will get a callback from this to set the encode/decode state. | |
863 | * | |
864 | * Rationale: we cannot disable VGA decode resources unconditionally some single | |
865 | * GPU laptops seem to require ACPI or BIOS access to the VGA registers to | |
866 | * control things like backlights etc. Hopefully newer multi-GPU laptops do | |
867 | * something saner, and desktops won't have any special ACPI for this. The | |
868 | * driver will get a callback when VGA arbitration is first used by userspace | |
869 | * since some older X servers have issues. | |
870 | * | |
871 | * This function does not check whether a client for @pdev has been registered | |
872 | * already. | |
873 | * | |
874 | * To unregister just call this function with @irq_set_state and @set_vga_decode | |
875 | * both set to NULL for the same @pdev as originally used to register them. | |
876 | * | |
877 | * Returns: 0 on success, -1 on failure | |
878 | */ | |
deb2d2ec BH |
879 | int vga_client_register(struct pci_dev *pdev, void *cookie, |
880 | void (*irq_set_state)(void *cookie, bool state), | |
5d90ccf9 TR |
881 | unsigned int (*set_vga_decode)(void *cookie, |
882 | bool decode)) | |
deb2d2ec | 883 | { |
934f992c | 884 | int ret = -ENODEV; |
deb2d2ec BH |
885 | struct vga_device *vgadev; |
886 | unsigned long flags; | |
887 | ||
888 | spin_lock_irqsave(&vga_lock, flags); | |
889 | vgadev = vgadev_find(pdev); | |
890 | if (!vgadev) | |
891 | goto bail; | |
892 | ||
893 | vgadev->irq_set_state = irq_set_state; | |
894 | vgadev->set_vga_decode = set_vga_decode; | |
895 | vgadev->cookie = cookie; | |
896 | ret = 0; | |
897 | ||
898 | bail: | |
899 | spin_unlock_irqrestore(&vga_lock, flags); | |
900 | return ret; | |
901 | ||
902 | } | |
903 | EXPORT_SYMBOL(vga_client_register); | |
904 | ||
905 | /* | |
906 | * Char driver implementation | |
907 | * | |
908 | * Semantics is: | |
909 | * | |
910 | * open : open user instance of the arbitrer. by default, it's | |
911 | * attached to the default VGA device of the system. | |
912 | * | |
913 | * close : close user instance, release locks | |
914 | * | |
915 | * read : return a string indicating the status of the target. | |
916 | * an IO state string is of the form {io,mem,io+mem,none}, | |
917 | * mc and ic are respectively mem and io lock counts (for | |
918 | * debugging/diagnostic only). "decodes" indicate what the | |
919 | * card currently decodes, "owns" indicates what is currently | |
920 | * enabled on it, and "locks" indicates what is locked by this | |
921 | * card. If the card is unplugged, we get "invalid" then for | |
922 | * card_ID and an -ENODEV error is returned for any command | |
923 | * until a new card is targeted | |
924 | * | |
925 | * "<card_ID>,decodes=<io_state>,owns=<io_state>,locks=<io_state> (ic,mc)" | |
926 | * | |
927 | * write : write a command to the arbiter. List of commands is: | |
928 | * | |
929 | * target <card_ID> : switch target to card <card_ID> (see below) | |
930 | * lock <io_state> : acquires locks on target ("none" is invalid io_state) | |
931 | * trylock <io_state> : non-blocking acquire locks on target | |
932 | * unlock <io_state> : release locks on target | |
933 | * unlock all : release all locks on target held by this user | |
934 | * decodes <io_state> : set the legacy decoding attributes for the card | |
935 | * | |
936 | * poll : event if something change on any card (not just the target) | |
937 | * | |
938 | * card_ID is of the form "PCI:domain:bus:dev.fn". It can be set to "default" | |
939 | * to go back to the system default card (TODO: not implemented yet). | |
940 | * Currently, only PCI is supported as a prefix, but the userland API may | |
941 | * support other bus types in the future, even if the current kernel | |
942 | * implementation doesn't. | |
943 | * | |
944 | * Note about locks: | |
945 | * | |
946 | * The driver keeps track of which user has what locks on which card. It | |
947 | * supports stacking, like the kernel one. This complexifies the implementation | |
948 | * a bit, but makes the arbiter more tolerant to userspace problems and able | |
949 | * to properly cleanup in all cases when a process dies. | |
950 | * Currently, a max of 16 cards simultaneously can have locks issued from | |
951 | * userspace for a given user (file descriptor instance) of the arbiter. | |
952 | * | |
953 | * If the device is hot-unplugged, there is a hook inside the module to notify | |
954 | * they being added/removed in the system and automatically added/removed in | |
955 | * the arbiter. | |
956 | */ | |
957 | ||
36028f33 | 958 | #define MAX_USER_CARDS CONFIG_VGA_ARB_MAX_GPUS |
deb2d2ec BH |
959 | #define PCI_INVALID_CARD ((struct pci_dev *)-1UL) |
960 | ||
961 | /* | |
962 | * Each user has an array of these, tracking which cards have locks | |
963 | */ | |
964 | struct vga_arb_user_card { | |
965 | struct pci_dev *pdev; | |
966 | unsigned int mem_cnt; | |
967 | unsigned int io_cnt; | |
968 | }; | |
969 | ||
970 | struct vga_arb_private { | |
971 | struct list_head list; | |
972 | struct pci_dev *target; | |
973 | struct vga_arb_user_card cards[MAX_USER_CARDS]; | |
974 | spinlock_t lock; | |
975 | }; | |
976 | ||
977 | static LIST_HEAD(vga_user_list); | |
978 | static DEFINE_SPINLOCK(vga_user_lock); | |
979 | ||
980 | ||
981 | /* | |
982 | * This function gets a string in the format: "PCI:domain:bus:dev.fn" and | |
983 | * returns the respective values. If the string is not in this format, | |
984 | * it returns 0. | |
985 | */ | |
986 | static int vga_pci_str_to_vars(char *buf, int count, unsigned int *domain, | |
987 | unsigned int *bus, unsigned int *devfn) | |
988 | { | |
989 | int n; | |
990 | unsigned int slot, func; | |
991 | ||
992 | ||
993 | n = sscanf(buf, "PCI:%x:%x:%x.%x", domain, bus, &slot, &func); | |
994 | if (n != 4) | |
995 | return 0; | |
996 | ||
997 | *devfn = PCI_DEVFN(slot, func); | |
998 | ||
999 | return 1; | |
1000 | } | |
1001 | ||
5d90ccf9 | 1002 | static ssize_t vga_arb_read(struct file *file, char __user *buf, |
deb2d2ec BH |
1003 | size_t count, loff_t *ppos) |
1004 | { | |
1005 | struct vga_arb_private *priv = file->private_data; | |
1006 | struct vga_device *vgadev; | |
1007 | struct pci_dev *pdev; | |
1008 | unsigned long flags; | |
1009 | size_t len; | |
1010 | int rc; | |
1011 | char *lbuf; | |
1012 | ||
1013 | lbuf = kmalloc(1024, GFP_KERNEL); | |
1014 | if (lbuf == NULL) | |
1015 | return -ENOMEM; | |
1016 | ||
1017 | /* Shields against vga_arb_device_card_gone (pci_dev going | |
1018 | * away), and allows access to vga list | |
1019 | */ | |
1020 | spin_lock_irqsave(&vga_lock, flags); | |
1021 | ||
25985edc | 1022 | /* If we are targeting the default, use it */ |
deb2d2ec BH |
1023 | pdev = priv->target; |
1024 | if (pdev == NULL || pdev == PCI_INVALID_CARD) { | |
1025 | spin_unlock_irqrestore(&vga_lock, flags); | |
1026 | len = sprintf(lbuf, "invalid"); | |
1027 | goto done; | |
1028 | } | |
1029 | ||
1030 | /* Find card vgadev structure */ | |
1031 | vgadev = vgadev_find(pdev); | |
1032 | if (vgadev == NULL) { | |
1033 | /* Wow, it's not in the list, that shouldn't happen, | |
1034 | * let's fix us up and return invalid card | |
1035 | */ | |
1036 | if (pdev == priv->target) | |
1037 | vga_arb_device_card_gone(pdev); | |
1038 | spin_unlock_irqrestore(&vga_lock, flags); | |
1039 | len = sprintf(lbuf, "invalid"); | |
1040 | goto done; | |
1041 | } | |
1042 | ||
1043 | /* Fill the buffer with infos */ | |
1044 | len = snprintf(lbuf, 1024, | |
1045 | "count:%d,PCI:%s,decodes=%s,owns=%s,locks=%s(%d:%d)\n", | |
1046 | vga_decode_count, pci_name(pdev), | |
1047 | vga_iostate_to_str(vgadev->decodes), | |
1048 | vga_iostate_to_str(vgadev->owns), | |
1049 | vga_iostate_to_str(vgadev->locks), | |
1050 | vgadev->io_lock_cnt, vgadev->mem_lock_cnt); | |
1051 | ||
1052 | spin_unlock_irqrestore(&vga_lock, flags); | |
1053 | done: | |
1054 | ||
1055 | /* Copy that to user */ | |
1056 | if (len > count) | |
1057 | len = count; | |
1058 | rc = copy_to_user(buf, lbuf, len); | |
1059 | kfree(lbuf); | |
1060 | if (rc) | |
1061 | return -EFAULT; | |
1062 | return len; | |
1063 | } | |
1064 | ||
1065 | /* | |
1066 | * TODO: To avoid parsing inside kernel and to improve the speed we may | |
1067 | * consider use ioctl here | |
1068 | */ | |
5d90ccf9 | 1069 | static ssize_t vga_arb_write(struct file *file, const char __user *buf, |
deb2d2ec BH |
1070 | size_t count, loff_t *ppos) |
1071 | { | |
1072 | struct vga_arb_private *priv = file->private_data; | |
1073 | struct vga_arb_user_card *uc = NULL; | |
1074 | struct pci_dev *pdev; | |
1075 | ||
1076 | unsigned int io_state; | |
1077 | ||
49521b13 | 1078 | char kbuf[64], *curr_pos; |
deb2d2ec BH |
1079 | size_t remaining = count; |
1080 | ||
1081 | int ret_val; | |
1082 | int i; | |
1083 | ||
49521b13 DV |
1084 | if (count >= sizeof(kbuf)) |
1085 | return -EINVAL; | |
1086 | if (copy_from_user(kbuf, buf, count)) | |
deb2d2ec | 1087 | return -EFAULT; |
deb2d2ec BH |
1088 | curr_pos = kbuf; |
1089 | kbuf[count] = '\0'; /* Just to make sure... */ | |
1090 | ||
1091 | if (strncmp(curr_pos, "lock ", 5) == 0) { | |
1092 | curr_pos += 5; | |
1093 | remaining -= 5; | |
1094 | ||
2d6e9b91 | 1095 | pr_debug("client 0x%p called 'lock'\n", priv); |
deb2d2ec BH |
1096 | |
1097 | if (!vga_str_to_iostate(curr_pos, remaining, &io_state)) { | |
1098 | ret_val = -EPROTO; | |
1099 | goto done; | |
1100 | } | |
1101 | if (io_state == VGA_RSRC_NONE) { | |
1102 | ret_val = -EPROTO; | |
1103 | goto done; | |
1104 | } | |
1105 | ||
1106 | pdev = priv->target; | |
1107 | if (priv->target == NULL) { | |
1108 | ret_val = -ENODEV; | |
1109 | goto done; | |
1110 | } | |
1111 | ||
1112 | vga_get_uninterruptible(pdev, io_state); | |
1113 | ||
1114 | /* Update the client's locks lists... */ | |
1115 | for (i = 0; i < MAX_USER_CARDS; i++) { | |
1116 | if (priv->cards[i].pdev == pdev) { | |
1117 | if (io_state & VGA_RSRC_LEGACY_IO) | |
1118 | priv->cards[i].io_cnt++; | |
1119 | if (io_state & VGA_RSRC_LEGACY_MEM) | |
1120 | priv->cards[i].mem_cnt++; | |
1121 | break; | |
1122 | } | |
1123 | } | |
1124 | ||
1125 | ret_val = count; | |
1126 | goto done; | |
1127 | } else if (strncmp(curr_pos, "unlock ", 7) == 0) { | |
1128 | curr_pos += 7; | |
1129 | remaining -= 7; | |
1130 | ||
2d6e9b91 | 1131 | pr_debug("client 0x%p called 'unlock'\n", priv); |
deb2d2ec BH |
1132 | |
1133 | if (strncmp(curr_pos, "all", 3) == 0) | |
1134 | io_state = VGA_RSRC_LEGACY_IO | VGA_RSRC_LEGACY_MEM; | |
1135 | else { | |
1136 | if (!vga_str_to_iostate | |
1137 | (curr_pos, remaining, &io_state)) { | |
1138 | ret_val = -EPROTO; | |
1139 | goto done; | |
1140 | } | |
1141 | /* TODO: Add this? | |
1142 | if (io_state == VGA_RSRC_NONE) { | |
1143 | ret_val = -EPROTO; | |
1144 | goto done; | |
1145 | } | |
1146 | */ | |
1147 | } | |
1148 | ||
1149 | pdev = priv->target; | |
1150 | if (priv->target == NULL) { | |
1151 | ret_val = -ENODEV; | |
1152 | goto done; | |
1153 | } | |
1154 | for (i = 0; i < MAX_USER_CARDS; i++) { | |
1155 | if (priv->cards[i].pdev == pdev) | |
1156 | uc = &priv->cards[i]; | |
1157 | } | |
1158 | ||
c916874d JL |
1159 | if (!uc) { |
1160 | ret_val = -EINVAL; | |
1161 | goto done; | |
1162 | } | |
deb2d2ec | 1163 | |
c916874d JL |
1164 | if (io_state & VGA_RSRC_LEGACY_IO && uc->io_cnt == 0) { |
1165 | ret_val = -EINVAL; | |
1166 | goto done; | |
1167 | } | |
deb2d2ec | 1168 | |
c916874d JL |
1169 | if (io_state & VGA_RSRC_LEGACY_MEM && uc->mem_cnt == 0) { |
1170 | ret_val = -EINVAL; | |
1171 | goto done; | |
1172 | } | |
deb2d2ec BH |
1173 | |
1174 | vga_put(pdev, io_state); | |
1175 | ||
1176 | if (io_state & VGA_RSRC_LEGACY_IO) | |
1177 | uc->io_cnt--; | |
1178 | if (io_state & VGA_RSRC_LEGACY_MEM) | |
1179 | uc->mem_cnt--; | |
1180 | ||
1181 | ret_val = count; | |
1182 | goto done; | |
1183 | } else if (strncmp(curr_pos, "trylock ", 8) == 0) { | |
1184 | curr_pos += 8; | |
1185 | remaining -= 8; | |
1186 | ||
2d6e9b91 | 1187 | pr_debug("client 0x%p called 'trylock'\n", priv); |
deb2d2ec BH |
1188 | |
1189 | if (!vga_str_to_iostate(curr_pos, remaining, &io_state)) { | |
1190 | ret_val = -EPROTO; | |
1191 | goto done; | |
1192 | } | |
1193 | /* TODO: Add this? | |
1194 | if (io_state == VGA_RSRC_NONE) { | |
1195 | ret_val = -EPROTO; | |
1196 | goto done; | |
1197 | } | |
1198 | */ | |
1199 | ||
1200 | pdev = priv->target; | |
1201 | if (priv->target == NULL) { | |
1202 | ret_val = -ENODEV; | |
1203 | goto done; | |
1204 | } | |
1205 | ||
1206 | if (vga_tryget(pdev, io_state)) { | |
1207 | /* Update the client's locks lists... */ | |
1208 | for (i = 0; i < MAX_USER_CARDS; i++) { | |
1209 | if (priv->cards[i].pdev == pdev) { | |
1210 | if (io_state & VGA_RSRC_LEGACY_IO) | |
1211 | priv->cards[i].io_cnt++; | |
1212 | if (io_state & VGA_RSRC_LEGACY_MEM) | |
1213 | priv->cards[i].mem_cnt++; | |
1214 | break; | |
1215 | } | |
1216 | } | |
1217 | ret_val = count; | |
1218 | goto done; | |
1219 | } else { | |
1220 | ret_val = -EBUSY; | |
1221 | goto done; | |
1222 | } | |
1223 | ||
1224 | } else if (strncmp(curr_pos, "target ", 7) == 0) { | |
1225 | unsigned int domain, bus, devfn; | |
1226 | struct vga_device *vgadev; | |
1227 | ||
1228 | curr_pos += 7; | |
1229 | remaining -= 7; | |
2d6e9b91 | 1230 | pr_debug("client 0x%p called 'target'\n", priv); |
deb2d2ec | 1231 | /* if target is default */ |
2cc9116c | 1232 | if (!strncmp(curr_pos, "default", 7)) |
deb2d2ec BH |
1233 | pdev = pci_dev_get(vga_default_device()); |
1234 | else { | |
1235 | if (!vga_pci_str_to_vars(curr_pos, remaining, | |
1236 | &domain, &bus, &devfn)) { | |
1237 | ret_val = -EPROTO; | |
1238 | goto done; | |
1239 | } | |
f85567c8 | 1240 | pdev = pci_get_domain_bus_and_slot(domain, bus, devfn); |
deb2d2ec | 1241 | if (!pdev) { |
cf590b87 BH |
1242 | pr_debug("invalid PCI address %04x:%02x:%02x.%x\n", |
1243 | domain, bus, PCI_SLOT(devfn), | |
1244 | PCI_FUNC(devfn)); | |
deb2d2ec BH |
1245 | ret_val = -ENODEV; |
1246 | goto done; | |
1247 | } | |
a75d68f6 BH |
1248 | |
1249 | pr_debug("%s ==> %04x:%02x:%02x.%x pdev %p\n", curr_pos, | |
1250 | domain, bus, PCI_SLOT(devfn), PCI_FUNC(devfn), | |
1251 | pdev); | |
deb2d2ec BH |
1252 | } |
1253 | ||
1254 | vgadev = vgadev_find(pdev); | |
8b7e2e86 | 1255 | pr_debug("vgadev %p\n", vgadev); |
deb2d2ec | 1256 | if (vgadev == NULL) { |
eb6944f2 | 1257 | if (pdev) { |
cf590b87 | 1258 | vgaarb_dbg(&pdev->dev, "not a VGA device\n"); |
eb6944f2 TR |
1259 | pci_dev_put(pdev); |
1260 | } | |
1261 | ||
deb2d2ec BH |
1262 | ret_val = -ENODEV; |
1263 | goto done; | |
1264 | } | |
1265 | ||
1266 | priv->target = pdev; | |
1267 | for (i = 0; i < MAX_USER_CARDS; i++) { | |
1268 | if (priv->cards[i].pdev == pdev) | |
1269 | break; | |
1270 | if (priv->cards[i].pdev == NULL) { | |
1271 | priv->cards[i].pdev = pdev; | |
1272 | priv->cards[i].io_cnt = 0; | |
1273 | priv->cards[i].mem_cnt = 0; | |
1274 | break; | |
1275 | } | |
1276 | } | |
1277 | if (i == MAX_USER_CARDS) { | |
cf590b87 | 1278 | vgaarb_dbg(&pdev->dev, "maximum user cards (%d) number reached, ignoring this one!\n", |
773a38db | 1279 | MAX_USER_CARDS); |
deb2d2ec BH |
1280 | pci_dev_put(pdev); |
1281 | /* XXX: which value to return? */ | |
1282 | ret_val = -ENOMEM; | |
1283 | goto done; | |
1284 | } | |
1285 | ||
1286 | ret_val = count; | |
1287 | pci_dev_put(pdev); | |
1288 | goto done; | |
1289 | ||
1290 | ||
1291 | } else if (strncmp(curr_pos, "decodes ", 8) == 0) { | |
1292 | curr_pos += 8; | |
1293 | remaining -= 8; | |
8b7e2e86 | 1294 | pr_debug("client 0x%p called 'decodes'\n", priv); |
deb2d2ec BH |
1295 | |
1296 | if (!vga_str_to_iostate(curr_pos, remaining, &io_state)) { | |
1297 | ret_val = -EPROTO; | |
1298 | goto done; | |
1299 | } | |
1300 | pdev = priv->target; | |
1301 | if (priv->target == NULL) { | |
1302 | ret_val = -ENODEV; | |
1303 | goto done; | |
1304 | } | |
1305 | ||
1306 | __vga_set_legacy_decoding(pdev, io_state, true); | |
1307 | ret_val = count; | |
1308 | goto done; | |
1309 | } | |
1310 | /* If we got here, the message written is not part of the protocol! */ | |
deb2d2ec BH |
1311 | return -EPROTO; |
1312 | ||
1313 | done: | |
deb2d2ec BH |
1314 | return ret_val; |
1315 | } | |
1316 | ||
afc9a42b | 1317 | static __poll_t vga_arb_fpoll(struct file *file, poll_table *wait) |
deb2d2ec | 1318 | { |
2d6e9b91 | 1319 | pr_debug("%s\n", __func__); |
deb2d2ec | 1320 | |
deb2d2ec | 1321 | poll_wait(file, &vga_wait_queue, wait); |
a9a08845 | 1322 | return EPOLLIN; |
deb2d2ec BH |
1323 | } |
1324 | ||
1325 | static int vga_arb_open(struct inode *inode, struct file *file) | |
1326 | { | |
1327 | struct vga_arb_private *priv; | |
1328 | unsigned long flags; | |
1329 | ||
2d6e9b91 | 1330 | pr_debug("%s\n", __func__); |
deb2d2ec | 1331 | |
f35119d6 | 1332 | priv = kzalloc(sizeof(*priv), GFP_KERNEL); |
deb2d2ec BH |
1333 | if (priv == NULL) |
1334 | return -ENOMEM; | |
deb2d2ec BH |
1335 | spin_lock_init(&priv->lock); |
1336 | file->private_data = priv; | |
1337 | ||
1338 | spin_lock_irqsave(&vga_user_lock, flags); | |
1339 | list_add(&priv->list, &vga_user_list); | |
1340 | spin_unlock_irqrestore(&vga_user_lock, flags); | |
1341 | ||
1342 | /* Set the client' lists of locks */ | |
1343 | priv->target = vga_default_device(); /* Maybe this is still null! */ | |
1344 | priv->cards[0].pdev = priv->target; | |
1345 | priv->cards[0].io_cnt = 0; | |
1346 | priv->cards[0].mem_cnt = 0; | |
1347 | ||
1348 | ||
1349 | return 0; | |
1350 | } | |
1351 | ||
1352 | static int vga_arb_release(struct inode *inode, struct file *file) | |
1353 | { | |
1354 | struct vga_arb_private *priv = file->private_data; | |
1355 | struct vga_arb_user_card *uc; | |
1356 | unsigned long flags; | |
1357 | int i; | |
1358 | ||
2d6e9b91 | 1359 | pr_debug("%s\n", __func__); |
deb2d2ec | 1360 | |
deb2d2ec BH |
1361 | spin_lock_irqsave(&vga_user_lock, flags); |
1362 | list_del(&priv->list); | |
1363 | for (i = 0; i < MAX_USER_CARDS; i++) { | |
1364 | uc = &priv->cards[i]; | |
1365 | if (uc->pdev == NULL) | |
1366 | continue; | |
a75d68f6 BH |
1367 | vgaarb_dbg(&uc->pdev->dev, "uc->io_cnt == %d, uc->mem_cnt == %d\n", |
1368 | uc->io_cnt, uc->mem_cnt); | |
deb2d2ec BH |
1369 | while (uc->io_cnt--) |
1370 | vga_put(uc->pdev, VGA_RSRC_LEGACY_IO); | |
1371 | while (uc->mem_cnt--) | |
1372 | vga_put(uc->pdev, VGA_RSRC_LEGACY_MEM); | |
1373 | } | |
1374 | spin_unlock_irqrestore(&vga_user_lock, flags); | |
1375 | ||
1376 | kfree(priv); | |
1377 | ||
1378 | return 0; | |
1379 | } | |
1380 | ||
1381 | static void vga_arb_device_card_gone(struct pci_dev *pdev) | |
1382 | { | |
1383 | } | |
1384 | ||
1385 | /* | |
1386 | * callback any registered clients to let them know we have a | |
1387 | * change in VGA cards | |
1388 | */ | |
1389 | static void vga_arbiter_notify_clients(void) | |
1390 | { | |
1391 | struct vga_device *vgadev; | |
1392 | unsigned long flags; | |
1393 | uint32_t new_decodes; | |
1394 | bool new_state; | |
1395 | ||
1396 | if (!vga_arbiter_used) | |
1397 | return; | |
1398 | ||
1399 | spin_lock_irqsave(&vga_lock, flags); | |
1400 | list_for_each_entry(vgadev, &vga_list, list) { | |
1401 | if (vga_count > 1) | |
1402 | new_state = false; | |
1403 | else | |
1404 | new_state = true; | |
1405 | if (vgadev->set_vga_decode) { | |
5d90ccf9 TR |
1406 | new_decodes = vgadev->set_vga_decode(vgadev->cookie, |
1407 | new_state); | |
deb2d2ec BH |
1408 | vga_update_device_decodes(vgadev, new_decodes); |
1409 | } | |
1410 | } | |
1411 | spin_unlock_irqrestore(&vga_lock, flags); | |
1412 | } | |
1413 | ||
1414 | static int pci_notify(struct notifier_block *nb, unsigned long action, | |
1415 | void *data) | |
1416 | { | |
1417 | struct device *dev = data; | |
1418 | struct pci_dev *pdev = to_pci_dev(dev); | |
1419 | bool notify = false; | |
1420 | ||
a75d68f6 | 1421 | vgaarb_dbg(dev, "%s\n", __func__); |
deb2d2ec BH |
1422 | |
1423 | /* For now we're only intereted in devices added and removed. I didn't | |
1424 | * test this thing here, so someone needs to double check for the | |
1425 | * cases of hotplugable vga cards. */ | |
1426 | if (action == BUS_NOTIFY_ADD_DEVICE) | |
1427 | notify = vga_arbiter_add_pci_device(pdev); | |
1428 | else if (action == BUS_NOTIFY_DEL_DEVICE) | |
1429 | notify = vga_arbiter_del_pci_device(pdev); | |
1430 | ||
1431 | if (notify) | |
1432 | vga_arbiter_notify_clients(); | |
1433 | return 0; | |
1434 | } | |
1435 | ||
1436 | static struct notifier_block pci_notifier = { | |
1437 | .notifier_call = pci_notify, | |
1438 | }; | |
1439 | ||
1440 | static const struct file_operations vga_arb_device_fops = { | |
1441 | .read = vga_arb_read, | |
1442 | .write = vga_arb_write, | |
1443 | .poll = vga_arb_fpoll, | |
1444 | .open = vga_arb_open, | |
1445 | .release = vga_arb_release, | |
6038f373 | 1446 | .llseek = noop_llseek, |
deb2d2ec BH |
1447 | }; |
1448 | ||
1449 | static struct miscdevice vga_arb_device = { | |
1450 | MISC_DYNAMIC_MINOR, "vga_arbiter", &vga_arb_device_fops | |
1451 | }; | |
1452 | ||
505a1b57 | 1453 | static void __init vga_arb_select_default_device(void) |
deb2d2ec | 1454 | { |
deb2d2ec | 1455 | struct pci_dev *pdev; |
3448a19d | 1456 | struct vga_device *vgadev; |
deb2d2ec | 1457 | |
505a1b57 | 1458 | #if defined(CONFIG_X86) || defined(CONFIG_IA64) |
a81c9ab6 AM |
1459 | u64 base = screen_info.lfb_base; |
1460 | u64 size = screen_info.lfb_size; | |
1461 | u64 limit; | |
1462 | resource_size_t start, end; | |
1463 | unsigned long flags; | |
1464 | int i; | |
1465 | ||
1466 | if (screen_info.capabilities & VIDEO_CAPABILITY_64BIT_BASE) | |
1467 | base |= (u64)screen_info.ext_lfb_base << 32; | |
1468 | ||
1469 | limit = base + size; | |
1470 | ||
3448a19d | 1471 | list_for_each_entry(vgadev, &vga_list, list) { |
ed2ab35e | 1472 | struct device *dev = &vgadev->pdev->dev; |
5d90ccf9 TR |
1473 | /* |
1474 | * Override vga_arbiter_add_pci_device()'s I/O based detection | |
1475 | * as it may take the wrong device (e.g. on Apple system under | |
1476 | * EFI). | |
86fd887b | 1477 | * |
5d90ccf9 TR |
1478 | * Select the device owning the boot framebuffer if there is |
1479 | * one. | |
86fd887b | 1480 | */ |
5d90ccf9 | 1481 | |
86fd887b BP |
1482 | /* Does firmware framebuffer belong to us? */ |
1483 | for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) { | |
5d90ccf9 TR |
1484 | flags = pci_resource_flags(vgadev->pdev, i); |
1485 | ||
1486 | if ((flags & IORESOURCE_MEM) == 0) | |
86fd887b BP |
1487 | continue; |
1488 | ||
1489 | start = pci_resource_start(vgadev->pdev, i); | |
1490 | end = pci_resource_end(vgadev->pdev, i); | |
1491 | ||
1492 | if (!start || !end) | |
1493 | continue; | |
1494 | ||
a81c9ab6 | 1495 | if (base < start || limit >= end) |
86fd887b | 1496 | continue; |
5d90ccf9 | 1497 | |
86fd887b | 1498 | if (!vga_default_device()) |
a75d68f6 | 1499 | vgaarb_info(dev, "setting as boot device\n"); |
86fd887b | 1500 | else if (vgadev->pdev != vga_default_device()) |
a75d68f6 | 1501 | vgaarb_info(dev, "overriding boot device\n"); |
86fd887b BP |
1502 | vga_set_default_device(vgadev->pdev); |
1503 | } | |
3448a19d | 1504 | } |
505a1b57 | 1505 | #endif |
a75d68f6 | 1506 | |
a37c0f48 BH |
1507 | if (!vga_default_device()) { |
1508 | list_for_each_entry(vgadev, &vga_list, list) { | |
1509 | struct device *dev = &vgadev->pdev->dev; | |
1510 | u16 cmd; | |
1511 | ||
1512 | pdev = vgadev->pdev; | |
1513 | pci_read_config_word(pdev, PCI_COMMAND, &cmd); | |
1514 | if (cmd & (PCI_COMMAND_IO | PCI_COMMAND_MEMORY)) { | |
1515 | vgaarb_info(dev, "setting as boot device (VGA legacy resources not available)\n"); | |
1516 | vga_set_default_device(pdev); | |
1517 | break; | |
1518 | } | |
1519 | } | |
1520 | } | |
1521 | ||
1522 | if (!vga_default_device()) { | |
1523 | vgadev = list_first_entry_or_null(&vga_list, | |
1524 | struct vga_device, list); | |
1525 | if (vgadev) { | |
1526 | struct device *dev = &vgadev->pdev->dev; | |
1527 | vgaarb_info(dev, "setting as boot device (VGA legacy resources not available)\n"); | |
1528 | vga_set_default_device(vgadev->pdev); | |
1529 | } | |
1530 | } | |
505a1b57 BH |
1531 | } |
1532 | ||
1533 | static int __init vga_arb_device_init(void) | |
1534 | { | |
1535 | int rc; | |
1536 | struct pci_dev *pdev; | |
1537 | struct vga_device *vgadev; | |
1538 | ||
1539 | rc = misc_register(&vga_arb_device); | |
1540 | if (rc < 0) | |
1541 | pr_err("error %d registering device\n", rc); | |
1542 | ||
1543 | bus_register_notifier(&pci_bus_type, &pci_notifier); | |
1544 | ||
1545 | /* We add all PCI devices satisfying VGA class in the arbiter by | |
1546 | * default */ | |
1547 | pdev = NULL; | |
1548 | while ((pdev = | |
1549 | pci_get_subsys(PCI_ANY_ID, PCI_ANY_ID, PCI_ANY_ID, | |
1550 | PCI_ANY_ID, pdev)) != NULL) | |
1551 | vga_arbiter_add_pci_device(pdev); | |
1552 | ||
1553 | list_for_each_entry(vgadev, &vga_list, list) { | |
1554 | struct device *dev = &vgadev->pdev->dev; | |
1555 | ||
1556 | if (vgadev->bridge_has_one_vga) | |
1557 | vgaarb_info(dev, "bridge control possible\n"); | |
1558 | else | |
1559 | vgaarb_info(dev, "no bridge control possible\n"); | |
1560 | } | |
1561 | ||
1562 | vga_arb_select_default_device(); | |
a37c0f48 | 1563 | |
a75d68f6 | 1564 | pr_info("loaded\n"); |
deb2d2ec BH |
1565 | return rc; |
1566 | } | |
1567 | subsys_initcall(vga_arb_device_init); |