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