Commit | Line | Data |
---|---|---|
6a9ee8af DA |
1 | /* |
2 | * Copyright (c) 2010 Red Hat Inc. | |
3 | * Author : Dave Airlie <airlied@redhat.com> | |
4 | * | |
5 | * | |
6 | * Licensed under GPLv2 | |
7 | * | |
8 | * vga_switcheroo.c - Support for laptop with dual GPU using one set of outputs | |
71309278 TR |
9 | * |
10 | * Switcher interface - methods require for ATPX and DCM | |
11 | * - switchto - this throws the output MUX switch | |
12 | * - discrete_set_power - sets the power state for the discrete card | |
13 | * | |
14 | * GPU driver interface | |
15 | * - set_gpu_state - this should do the equiv of s/r for the card | |
16 | * - this should *not* set the discrete power state | |
17 | * - switch_check - check if the device is in a position to switch now | |
6a9ee8af DA |
18 | */ |
19 | ||
9b0be1eb TR |
20 | #define pr_fmt(fmt) "vga_switcheroo: " fmt |
21 | ||
6a9ee8af | 22 | #include <linux/module.h> |
6a9ee8af DA |
23 | #include <linux/seq_file.h> |
24 | #include <linux/uaccess.h> | |
25 | #include <linux/fs.h> | |
26 | #include <linux/debugfs.h> | |
27 | #include <linux/fb.h> | |
28 | ||
6a9ee8af | 29 | #include <linux/pci.h> |
054430e7 | 30 | #include <linux/console.h> |
6a9ee8af | 31 | #include <linux/vga_switcheroo.h> |
0d69704a | 32 | #include <linux/pm_runtime.h> |
6a9ee8af | 33 | |
2fbe8c7c MG |
34 | #include <linux/vgaarb.h> |
35 | ||
6a9ee8af DA |
36 | struct vga_switcheroo_client { |
37 | struct pci_dev *pdev; | |
38 | struct fb_info *fb_info; | |
39 | int pwr_state; | |
26ec685f | 40 | const struct vga_switcheroo_client_ops *ops; |
6a9ee8af DA |
41 | int id; |
42 | bool active; | |
0d69704a | 43 | bool driver_power_control; |
79721e0a | 44 | struct list_head list; |
6a9ee8af DA |
45 | }; |
46 | ||
47 | static DEFINE_MUTEX(vgasr_mutex); | |
48 | ||
49 | struct vgasr_priv { | |
50 | ||
51 | bool active; | |
52 | bool delayed_switch_active; | |
53 | enum vga_switcheroo_client_id delayed_client_id; | |
54 | ||
55 | struct dentry *debugfs_root; | |
56 | struct dentry *switch_file; | |
57 | ||
58 | int registered_clients; | |
79721e0a | 59 | struct list_head clients; |
6a9ee8af DA |
60 | |
61 | struct vga_switcheroo_handler *handler; | |
62 | }; | |
63 | ||
3e9e63db TI |
64 | #define ID_BIT_AUDIO 0x100 |
65 | #define client_is_audio(c) ((c)->id & ID_BIT_AUDIO) | |
66 | #define client_is_vga(c) ((c)->id == -1 || !client_is_audio(c)) | |
67 | #define client_id(c) ((c)->id & ~ID_BIT_AUDIO) | |
68 | ||
6a9ee8af DA |
69 | static int vga_switcheroo_debugfs_init(struct vgasr_priv *priv); |
70 | static void vga_switcheroo_debugfs_fini(struct vgasr_priv *priv); | |
71 | ||
72 | /* only one switcheroo per system */ | |
79721e0a TI |
73 | static struct vgasr_priv vgasr_priv = { |
74 | .clients = LIST_HEAD_INIT(vgasr_priv.clients), | |
75 | }; | |
6a9ee8af | 76 | |
36704c0c | 77 | static bool vga_switcheroo_ready(void) |
6a9ee8af | 78 | { |
36704c0c SF |
79 | /* we're ready if we get two clients + handler */ |
80 | return !vgasr_priv.active && | |
81 | vgasr_priv.registered_clients == 2 && vgasr_priv.handler; | |
6a9ee8af | 82 | } |
6a9ee8af DA |
83 | |
84 | static void vga_switcheroo_enable(void) | |
85 | { | |
6a9ee8af | 86 | int ret; |
79721e0a TI |
87 | struct vga_switcheroo_client *client; |
88 | ||
6a9ee8af | 89 | /* call the handler to init */ |
e99eac5e SF |
90 | if (vgasr_priv.handler->init) |
91 | vgasr_priv.handler->init(); | |
6a9ee8af | 92 | |
79721e0a | 93 | list_for_each_entry(client, &vgasr_priv.clients, list) { |
3e9e63db TI |
94 | if (client->id != -1) |
95 | continue; | |
79721e0a | 96 | ret = vgasr_priv.handler->get_client_id(client->pdev); |
6a9ee8af DA |
97 | if (ret < 0) |
98 | return; | |
99 | ||
79721e0a | 100 | client->id = ret; |
6a9ee8af DA |
101 | } |
102 | vga_switcheroo_debugfs_init(&vgasr_priv); | |
103 | vgasr_priv.active = true; | |
104 | } | |
105 | ||
36704c0c SF |
106 | int vga_switcheroo_register_handler(struct vga_switcheroo_handler *handler) |
107 | { | |
108 | mutex_lock(&vgasr_mutex); | |
109 | if (vgasr_priv.handler) { | |
110 | mutex_unlock(&vgasr_mutex); | |
111 | return -EINVAL; | |
112 | } | |
113 | ||
114 | vgasr_priv.handler = handler; | |
115 | if (vga_switcheroo_ready()) { | |
9b0be1eb | 116 | pr_info("enabled\n"); |
36704c0c SF |
117 | vga_switcheroo_enable(); |
118 | } | |
119 | mutex_unlock(&vgasr_mutex); | |
120 | return 0; | |
121 | } | |
122 | EXPORT_SYMBOL(vga_switcheroo_register_handler); | |
123 | ||
124 | void vga_switcheroo_unregister_handler(void) | |
125 | { | |
126 | mutex_lock(&vgasr_mutex); | |
127 | vgasr_priv.handler = NULL; | |
128 | if (vgasr_priv.active) { | |
9b0be1eb | 129 | pr_info("disabled\n"); |
36704c0c SF |
130 | vga_switcheroo_debugfs_fini(&vgasr_priv); |
131 | vgasr_priv.active = false; | |
132 | } | |
133 | mutex_unlock(&vgasr_mutex); | |
134 | } | |
135 | EXPORT_SYMBOL(vga_switcheroo_unregister_handler); | |
136 | ||
3e9e63db TI |
137 | static int register_client(struct pci_dev *pdev, |
138 | const struct vga_switcheroo_client_ops *ops, | |
0d69704a | 139 | int id, bool active, bool driver_power_control) |
6a9ee8af | 140 | { |
79721e0a | 141 | struct vga_switcheroo_client *client; |
6a9ee8af | 142 | |
79721e0a TI |
143 | client = kzalloc(sizeof(*client), GFP_KERNEL); |
144 | if (!client) | |
145 | return -ENOMEM; | |
146 | ||
147 | client->pwr_state = VGA_SWITCHEROO_ON; | |
148 | client->pdev = pdev; | |
26ec685f | 149 | client->ops = ops; |
3e9e63db TI |
150 | client->id = id; |
151 | client->active = active; | |
0d69704a | 152 | client->driver_power_control = driver_power_control; |
6a9ee8af | 153 | |
79721e0a TI |
154 | mutex_lock(&vgasr_mutex); |
155 | list_add_tail(&client->list, &vgasr_priv.clients); | |
3e9e63db TI |
156 | if (client_is_vga(client)) |
157 | vgasr_priv.registered_clients++; | |
6a9ee8af | 158 | |
36704c0c | 159 | if (vga_switcheroo_ready()) { |
9b0be1eb | 160 | pr_info("enabled\n"); |
6a9ee8af DA |
161 | vga_switcheroo_enable(); |
162 | } | |
163 | mutex_unlock(&vgasr_mutex); | |
164 | return 0; | |
165 | } | |
3e9e63db TI |
166 | |
167 | int vga_switcheroo_register_client(struct pci_dev *pdev, | |
0d69704a DA |
168 | const struct vga_switcheroo_client_ops *ops, |
169 | bool driver_power_control) | |
3e9e63db TI |
170 | { |
171 | return register_client(pdev, ops, -1, | |
7491bfb4 TR |
172 | pdev == vga_default_device(), |
173 | driver_power_control); | |
3e9e63db | 174 | } |
6a9ee8af DA |
175 | EXPORT_SYMBOL(vga_switcheroo_register_client); |
176 | ||
3e9e63db TI |
177 | int vga_switcheroo_register_audio_client(struct pci_dev *pdev, |
178 | const struct vga_switcheroo_client_ops *ops, | |
179 | int id, bool active) | |
180 | { | |
0d69704a | 181 | return register_client(pdev, ops, id | ID_BIT_AUDIO, active, false); |
3e9e63db TI |
182 | } |
183 | EXPORT_SYMBOL(vga_switcheroo_register_audio_client); | |
184 | ||
79721e0a TI |
185 | static struct vga_switcheroo_client * |
186 | find_client_from_pci(struct list_head *head, struct pci_dev *pdev) | |
187 | { | |
188 | struct vga_switcheroo_client *client; | |
7491bfb4 | 189 | |
79721e0a TI |
190 | list_for_each_entry(client, head, list) |
191 | if (client->pdev == pdev) | |
192 | return client; | |
193 | return NULL; | |
194 | } | |
195 | ||
196 | static struct vga_switcheroo_client * | |
197 | find_client_from_id(struct list_head *head, int client_id) | |
198 | { | |
199 | struct vga_switcheroo_client *client; | |
7491bfb4 | 200 | |
79721e0a TI |
201 | list_for_each_entry(client, head, list) |
202 | if (client->id == client_id) | |
203 | return client; | |
204 | return NULL; | |
205 | } | |
206 | ||
207 | static struct vga_switcheroo_client * | |
208 | find_active_client(struct list_head *head) | |
209 | { | |
210 | struct vga_switcheroo_client *client; | |
7491bfb4 | 211 | |
79721e0a | 212 | list_for_each_entry(client, head, list) |
3e9e63db | 213 | if (client->active && client_is_vga(client)) |
79721e0a TI |
214 | return client; |
215 | return NULL; | |
216 | } | |
217 | ||
c8e9cf7b TI |
218 | int vga_switcheroo_get_client_state(struct pci_dev *pdev) |
219 | { | |
220 | struct vga_switcheroo_client *client; | |
221 | ||
222 | client = find_client_from_pci(&vgasr_priv.clients, pdev); | |
223 | if (!client) | |
224 | return VGA_SWITCHEROO_NOT_FOUND; | |
225 | if (!vgasr_priv.active) | |
226 | return VGA_SWITCHEROO_INIT; | |
227 | return client->pwr_state; | |
228 | } | |
229 | EXPORT_SYMBOL(vga_switcheroo_get_client_state); | |
230 | ||
6a9ee8af DA |
231 | void vga_switcheroo_unregister_client(struct pci_dev *pdev) |
232 | { | |
79721e0a | 233 | struct vga_switcheroo_client *client; |
6a9ee8af DA |
234 | |
235 | mutex_lock(&vgasr_mutex); | |
79721e0a TI |
236 | client = find_client_from_pci(&vgasr_priv.clients, pdev); |
237 | if (client) { | |
3e9e63db TI |
238 | if (client_is_vga(client)) |
239 | vgasr_priv.registered_clients--; | |
79721e0a TI |
240 | list_del(&client->list); |
241 | kfree(client); | |
6a9ee8af | 242 | } |
3e9e63db | 243 | if (vgasr_priv.active && vgasr_priv.registered_clients < 2) { |
9b0be1eb | 244 | pr_info("disabled\n"); |
3e9e63db TI |
245 | vga_switcheroo_debugfs_fini(&vgasr_priv); |
246 | vgasr_priv.active = false; | |
247 | } | |
6a9ee8af DA |
248 | mutex_unlock(&vgasr_mutex); |
249 | } | |
250 | EXPORT_SYMBOL(vga_switcheroo_unregister_client); | |
251 | ||
252 | void vga_switcheroo_client_fb_set(struct pci_dev *pdev, | |
253 | struct fb_info *info) | |
254 | { | |
79721e0a | 255 | struct vga_switcheroo_client *client; |
6a9ee8af DA |
256 | |
257 | mutex_lock(&vgasr_mutex); | |
79721e0a TI |
258 | client = find_client_from_pci(&vgasr_priv.clients, pdev); |
259 | if (client) | |
260 | client->fb_info = info; | |
6a9ee8af DA |
261 | mutex_unlock(&vgasr_mutex); |
262 | } | |
263 | EXPORT_SYMBOL(vga_switcheroo_client_fb_set); | |
264 | ||
265 | static int vga_switcheroo_show(struct seq_file *m, void *v) | |
266 | { | |
79721e0a TI |
267 | struct vga_switcheroo_client *client; |
268 | int i = 0; | |
7491bfb4 | 269 | |
6a9ee8af | 270 | mutex_lock(&vgasr_mutex); |
79721e0a | 271 | list_for_each_entry(client, &vgasr_priv.clients, list) { |
0d69704a | 272 | seq_printf(m, "%d:%s%s:%c:%s%s:%s\n", i, |
7491bfb4 TR |
273 | client_id(client) == VGA_SWITCHEROO_DIS ? "DIS" : |
274 | "IGD", | |
3e9e63db | 275 | client_is_vga(client) ? "" : "-Audio", |
79721e0a | 276 | client->active ? '+' : ' ', |
0d69704a | 277 | client->driver_power_control ? "Dyn" : "", |
79721e0a TI |
278 | client->pwr_state ? "Pwr" : "Off", |
279 | pci_name(client->pdev)); | |
280 | i++; | |
6a9ee8af DA |
281 | } |
282 | mutex_unlock(&vgasr_mutex); | |
283 | return 0; | |
284 | } | |
285 | ||
286 | static int vga_switcheroo_debugfs_open(struct inode *inode, struct file *file) | |
287 | { | |
288 | return single_open(file, vga_switcheroo_show, NULL); | |
289 | } | |
290 | ||
291 | static int vga_switchon(struct vga_switcheroo_client *client) | |
292 | { | |
0d69704a DA |
293 | if (client->driver_power_control) |
294 | return 0; | |
5cfb3c3a DA |
295 | if (vgasr_priv.handler->power_state) |
296 | vgasr_priv.handler->power_state(client->id, VGA_SWITCHEROO_ON); | |
6a9ee8af | 297 | /* call the driver callback to turn on device */ |
26ec685f | 298 | client->ops->set_gpu_state(client->pdev, VGA_SWITCHEROO_ON); |
6a9ee8af DA |
299 | client->pwr_state = VGA_SWITCHEROO_ON; |
300 | return 0; | |
301 | } | |
302 | ||
303 | static int vga_switchoff(struct vga_switcheroo_client *client) | |
304 | { | |
0d69704a DA |
305 | if (client->driver_power_control) |
306 | return 0; | |
6a9ee8af | 307 | /* call the driver callback to turn off device */ |
26ec685f | 308 | client->ops->set_gpu_state(client->pdev, VGA_SWITCHEROO_OFF); |
5cfb3c3a DA |
309 | if (vgasr_priv.handler->power_state) |
310 | vgasr_priv.handler->power_state(client->id, VGA_SWITCHEROO_OFF); | |
6a9ee8af DA |
311 | client->pwr_state = VGA_SWITCHEROO_OFF; |
312 | return 0; | |
313 | } | |
314 | ||
3e9e63db TI |
315 | static void set_audio_state(int id, int state) |
316 | { | |
317 | struct vga_switcheroo_client *client; | |
318 | ||
319 | client = find_client_from_id(&vgasr_priv.clients, id | ID_BIT_AUDIO); | |
320 | if (client && client->pwr_state != state) { | |
321 | client->ops->set_gpu_state(client->pdev, state); | |
322 | client->pwr_state = state; | |
323 | } | |
324 | } | |
325 | ||
66b37c67 DA |
326 | /* stage one happens before delay */ |
327 | static int vga_switchto_stage1(struct vga_switcheroo_client *new_client) | |
6a9ee8af | 328 | { |
79721e0a | 329 | struct vga_switcheroo_client *active; |
6a9ee8af | 330 | |
79721e0a | 331 | active = find_active_client(&vgasr_priv.clients); |
6a9ee8af DA |
332 | if (!active) |
333 | return 0; | |
334 | ||
6a9ee8af DA |
335 | if (new_client->pwr_state == VGA_SWITCHEROO_OFF) |
336 | vga_switchon(new_client); | |
337 | ||
2fbe8c7c | 338 | vga_set_default_device(new_client->pdev); |
66b37c67 DA |
339 | return 0; |
340 | } | |
341 | ||
342 | /* post delay */ | |
343 | static int vga_switchto_stage2(struct vga_switcheroo_client *new_client) | |
344 | { | |
345 | int ret; | |
79721e0a | 346 | struct vga_switcheroo_client *active; |
66b37c67 | 347 | |
79721e0a | 348 | active = find_active_client(&vgasr_priv.clients); |
66b37c67 DA |
349 | if (!active) |
350 | return 0; | |
351 | ||
352 | active->active = false; | |
6a9ee8af | 353 | |
c91c3fae TI |
354 | set_audio_state(active->id, VGA_SWITCHEROO_OFF); |
355 | ||
6a9ee8af DA |
356 | if (new_client->fb_info) { |
357 | struct fb_event event; | |
7491bfb4 | 358 | |
054430e7 | 359 | console_lock(); |
6a9ee8af DA |
360 | event.info = new_client->fb_info; |
361 | fb_notifier_call_chain(FB_EVENT_REMAP_ALL_CONSOLE, &event); | |
054430e7 | 362 | console_unlock(); |
6a9ee8af DA |
363 | } |
364 | ||
365 | ret = vgasr_priv.handler->switchto(new_client->id); | |
366 | if (ret) | |
367 | return ret; | |
368 | ||
26ec685f TI |
369 | if (new_client->ops->reprobe) |
370 | new_client->ops->reprobe(new_client->pdev); | |
8d608aa6 | 371 | |
6a9ee8af DA |
372 | if (active->pwr_state == VGA_SWITCHEROO_ON) |
373 | vga_switchoff(active); | |
374 | ||
c91c3fae TI |
375 | set_audio_state(new_client->id, VGA_SWITCHEROO_ON); |
376 | ||
6a9ee8af DA |
377 | new_client->active = true; |
378 | return 0; | |
379 | } | |
380 | ||
79721e0a TI |
381 | static bool check_can_switch(void) |
382 | { | |
383 | struct vga_switcheroo_client *client; | |
384 | ||
385 | list_for_each_entry(client, &vgasr_priv.clients, list) { | |
26ec685f | 386 | if (!client->ops->can_switch(client->pdev)) { |
9b0be1eb | 387 | pr_err("client %x refused switch\n", client->id); |
79721e0a TI |
388 | return false; |
389 | } | |
390 | } | |
391 | return true; | |
392 | } | |
393 | ||
6a9ee8af DA |
394 | static ssize_t |
395 | vga_switcheroo_debugfs_write(struct file *filp, const char __user *ubuf, | |
396 | size_t cnt, loff_t *ppos) | |
397 | { | |
398 | char usercmd[64]; | |
79721e0a | 399 | int ret; |
6a9ee8af | 400 | bool delay = false, can_switch; |
851ab954 | 401 | bool just_mux = false; |
6a9ee8af DA |
402 | int client_id = -1; |
403 | struct vga_switcheroo_client *client = NULL; | |
404 | ||
405 | if (cnt > 63) | |
406 | cnt = 63; | |
407 | ||
408 | if (copy_from_user(usercmd, ubuf, cnt)) | |
409 | return -EFAULT; | |
410 | ||
411 | mutex_lock(&vgasr_mutex); | |
412 | ||
8c88e50b JS |
413 | if (!vgasr_priv.active) { |
414 | cnt = -EINVAL; | |
415 | goto out; | |
416 | } | |
6a9ee8af DA |
417 | |
418 | /* pwr off the device not in use */ | |
419 | if (strncmp(usercmd, "OFF", 3) == 0) { | |
79721e0a | 420 | list_for_each_entry(client, &vgasr_priv.clients, list) { |
c91c3fae | 421 | if (client->active || client_is_audio(client)) |
6a9ee8af | 422 | continue; |
0d69704a DA |
423 | if (client->driver_power_control) |
424 | continue; | |
c91c3fae | 425 | set_audio_state(client->id, VGA_SWITCHEROO_OFF); |
79721e0a TI |
426 | if (client->pwr_state == VGA_SWITCHEROO_ON) |
427 | vga_switchoff(client); | |
6a9ee8af DA |
428 | } |
429 | goto out; | |
430 | } | |
431 | /* pwr on the device not in use */ | |
432 | if (strncmp(usercmd, "ON", 2) == 0) { | |
79721e0a | 433 | list_for_each_entry(client, &vgasr_priv.clients, list) { |
c91c3fae | 434 | if (client->active || client_is_audio(client)) |
6a9ee8af | 435 | continue; |
0d69704a DA |
436 | if (client->driver_power_control) |
437 | continue; | |
79721e0a TI |
438 | if (client->pwr_state == VGA_SWITCHEROO_OFF) |
439 | vga_switchon(client); | |
c91c3fae | 440 | set_audio_state(client->id, VGA_SWITCHEROO_ON); |
6a9ee8af DA |
441 | } |
442 | goto out; | |
443 | } | |
444 | ||
445 | /* request a delayed switch - test can we switch now */ | |
446 | if (strncmp(usercmd, "DIGD", 4) == 0) { | |
447 | client_id = VGA_SWITCHEROO_IGD; | |
448 | delay = true; | |
449 | } | |
450 | ||
451 | if (strncmp(usercmd, "DDIS", 4) == 0) { | |
452 | client_id = VGA_SWITCHEROO_DIS; | |
453 | delay = true; | |
454 | } | |
455 | ||
456 | if (strncmp(usercmd, "IGD", 3) == 0) | |
457 | client_id = VGA_SWITCHEROO_IGD; | |
458 | ||
459 | if (strncmp(usercmd, "DIS", 3) == 0) | |
460 | client_id = VGA_SWITCHEROO_DIS; | |
461 | ||
fea6f330 | 462 | if (strncmp(usercmd, "MIGD", 4) == 0) { |
851ab954 DA |
463 | just_mux = true; |
464 | client_id = VGA_SWITCHEROO_IGD; | |
465 | } | |
fea6f330 | 466 | if (strncmp(usercmd, "MDIS", 4) == 0) { |
851ab954 DA |
467 | just_mux = true; |
468 | client_id = VGA_SWITCHEROO_DIS; | |
469 | } | |
470 | ||
6a9ee8af DA |
471 | if (client_id == -1) |
472 | goto out; | |
79721e0a TI |
473 | client = find_client_from_id(&vgasr_priv.clients, client_id); |
474 | if (!client) | |
475 | goto out; | |
6a9ee8af DA |
476 | |
477 | vgasr_priv.delayed_switch_active = false; | |
851ab954 DA |
478 | |
479 | if (just_mux) { | |
480 | ret = vgasr_priv.handler->switchto(client_id); | |
481 | goto out; | |
482 | } | |
483 | ||
79721e0a | 484 | if (client->active) |
a67b8887 FM |
485 | goto out; |
486 | ||
6a9ee8af | 487 | /* okay we want a switch - test if devices are willing to switch */ |
79721e0a | 488 | can_switch = check_can_switch(); |
6a9ee8af DA |
489 | |
490 | if (can_switch == false && delay == false) | |
491 | goto out; | |
492 | ||
79721e0a | 493 | if (can_switch) { |
66b37c67 DA |
494 | ret = vga_switchto_stage1(client); |
495 | if (ret) | |
9b0be1eb | 496 | pr_err("switching failed stage 1 %d\n", ret); |
66b37c67 DA |
497 | |
498 | ret = vga_switchto_stage2(client); | |
6a9ee8af | 499 | if (ret) |
9b0be1eb | 500 | pr_err("switching failed stage 2 %d\n", ret); |
66b37c67 | 501 | |
6a9ee8af | 502 | } else { |
9b0be1eb | 503 | pr_info("setting delayed switch to client %d\n", client->id); |
6a9ee8af DA |
504 | vgasr_priv.delayed_switch_active = true; |
505 | vgasr_priv.delayed_client_id = client_id; | |
506 | ||
66b37c67 DA |
507 | ret = vga_switchto_stage1(client); |
508 | if (ret) | |
9b0be1eb | 509 | pr_err("delayed switching stage 1 failed %d\n", ret); |
6a9ee8af DA |
510 | } |
511 | ||
512 | out: | |
513 | mutex_unlock(&vgasr_mutex); | |
514 | return cnt; | |
515 | } | |
516 | ||
517 | static const struct file_operations vga_switcheroo_debugfs_fops = { | |
518 | .owner = THIS_MODULE, | |
519 | .open = vga_switcheroo_debugfs_open, | |
520 | .write = vga_switcheroo_debugfs_write, | |
521 | .read = seq_read, | |
522 | .llseek = seq_lseek, | |
523 | .release = single_release, | |
524 | }; | |
525 | ||
526 | static void vga_switcheroo_debugfs_fini(struct vgasr_priv *priv) | |
527 | { | |
528 | if (priv->switch_file) { | |
529 | debugfs_remove(priv->switch_file); | |
530 | priv->switch_file = NULL; | |
531 | } | |
532 | if (priv->debugfs_root) { | |
533 | debugfs_remove(priv->debugfs_root); | |
534 | priv->debugfs_root = NULL; | |
535 | } | |
536 | } | |
537 | ||
538 | static int vga_switcheroo_debugfs_init(struct vgasr_priv *priv) | |
539 | { | |
9b0be1eb TR |
540 | static const char mp[] = "/sys/kernel/debug"; |
541 | ||
6a9ee8af DA |
542 | /* already initialised */ |
543 | if (priv->debugfs_root) | |
544 | return 0; | |
545 | priv->debugfs_root = debugfs_create_dir("vgaswitcheroo", NULL); | |
546 | ||
547 | if (!priv->debugfs_root) { | |
9b0be1eb | 548 | pr_err("Cannot create %s/vgaswitcheroo\n", mp); |
6a9ee8af DA |
549 | goto fail; |
550 | } | |
551 | ||
552 | priv->switch_file = debugfs_create_file("switch", 0644, | |
7491bfb4 TR |
553 | priv->debugfs_root, NULL, |
554 | &vga_switcheroo_debugfs_fops); | |
6a9ee8af | 555 | if (!priv->switch_file) { |
9b0be1eb | 556 | pr_err("cannot create %s/vgaswitcheroo/switch\n", mp); |
6a9ee8af DA |
557 | goto fail; |
558 | } | |
559 | return 0; | |
560 | fail: | |
561 | vga_switcheroo_debugfs_fini(priv); | |
562 | return -1; | |
563 | } | |
564 | ||
565 | int vga_switcheroo_process_delayed_switch(void) | |
566 | { | |
79721e0a | 567 | struct vga_switcheroo_client *client; |
6a9ee8af DA |
568 | int ret; |
569 | int err = -EINVAL; | |
570 | ||
571 | mutex_lock(&vgasr_mutex); | |
572 | if (!vgasr_priv.delayed_switch_active) | |
573 | goto err; | |
574 | ||
9b0be1eb TR |
575 | pr_info("processing delayed switch to %d\n", |
576 | vgasr_priv.delayed_client_id); | |
6a9ee8af | 577 | |
79721e0a TI |
578 | client = find_client_from_id(&vgasr_priv.clients, |
579 | vgasr_priv.delayed_client_id); | |
580 | if (!client || !check_can_switch()) | |
6a9ee8af DA |
581 | goto err; |
582 | ||
66b37c67 | 583 | ret = vga_switchto_stage2(client); |
6a9ee8af | 584 | if (ret) |
9b0be1eb | 585 | pr_err("delayed switching failed stage 2 %d\n", ret); |
6a9ee8af DA |
586 | |
587 | vgasr_priv.delayed_switch_active = false; | |
588 | err = 0; | |
589 | err: | |
590 | mutex_unlock(&vgasr_mutex); | |
591 | return err; | |
592 | } | |
593 | EXPORT_SYMBOL(vga_switcheroo_process_delayed_switch); | |
0d69704a | 594 | |
7491bfb4 TR |
595 | static void vga_switcheroo_power_switch(struct pci_dev *pdev, |
596 | enum vga_switcheroo_state state) | |
0d69704a DA |
597 | { |
598 | struct vga_switcheroo_client *client; | |
599 | ||
600 | if (!vgasr_priv.handler->power_state) | |
601 | return; | |
602 | ||
603 | client = find_client_from_pci(&vgasr_priv.clients, pdev); | |
604 | if (!client) | |
605 | return; | |
606 | ||
607 | if (!client->driver_power_control) | |
608 | return; | |
609 | ||
610 | vgasr_priv.handler->power_state(client->id, state); | |
611 | } | |
612 | ||
613 | /* force a PCI device to a certain state - mainly to turn off audio clients */ | |
614 | ||
7491bfb4 TR |
615 | void vga_switcheroo_set_dynamic_switch(struct pci_dev *pdev, |
616 | enum vga_switcheroo_state dynamic) | |
0d69704a DA |
617 | { |
618 | struct vga_switcheroo_client *client; | |
619 | ||
620 | client = find_client_from_pci(&vgasr_priv.clients, pdev); | |
621 | if (!client) | |
622 | return; | |
623 | ||
624 | if (!client->driver_power_control) | |
625 | return; | |
626 | ||
627 | client->pwr_state = dynamic; | |
628 | set_audio_state(client->id, dynamic); | |
629 | } | |
630 | EXPORT_SYMBOL(vga_switcheroo_set_dynamic_switch); | |
631 | ||
632 | /* switcheroo power domain */ | |
633 | static int vga_switcheroo_runtime_suspend(struct device *dev) | |
634 | { | |
635 | struct pci_dev *pdev = to_pci_dev(dev); | |
636 | int ret; | |
637 | ||
638 | ret = dev->bus->pm->runtime_suspend(dev); | |
639 | if (ret) | |
640 | return ret; | |
f2bc5616 AD |
641 | if (vgasr_priv.handler->switchto) |
642 | vgasr_priv.handler->switchto(VGA_SWITCHEROO_IGD); | |
0d69704a DA |
643 | vga_switcheroo_power_switch(pdev, VGA_SWITCHEROO_OFF); |
644 | return 0; | |
645 | } | |
646 | ||
647 | static int vga_switcheroo_runtime_resume(struct device *dev) | |
648 | { | |
649 | struct pci_dev *pdev = to_pci_dev(dev); | |
650 | int ret; | |
651 | ||
652 | vga_switcheroo_power_switch(pdev, VGA_SWITCHEROO_ON); | |
653 | ret = dev->bus->pm->runtime_resume(dev); | |
654 | if (ret) | |
655 | return ret; | |
656 | ||
657 | return 0; | |
658 | } | |
659 | ||
660 | /* this version is for the case where the power switch is separate | |
661 | to the device being powered down. */ | |
7491bfb4 TR |
662 | int vga_switcheroo_init_domain_pm_ops(struct device *dev, |
663 | struct dev_pm_domain *domain) | |
0d69704a DA |
664 | { |
665 | /* copy over all the bus versions */ | |
666 | if (dev->bus && dev->bus->pm) { | |
667 | domain->ops = *dev->bus->pm; | |
668 | domain->ops.runtime_suspend = vga_switcheroo_runtime_suspend; | |
669 | domain->ops.runtime_resume = vga_switcheroo_runtime_resume; | |
670 | ||
671 | dev->pm_domain = domain; | |
672 | return 0; | |
673 | } | |
674 | dev->pm_domain = NULL; | |
675 | return -EINVAL; | |
676 | } | |
677 | EXPORT_SYMBOL(vga_switcheroo_init_domain_pm_ops); | |
678 | ||
766a53d0 AD |
679 | void vga_switcheroo_fini_domain_pm_ops(struct device *dev) |
680 | { | |
681 | dev->pm_domain = NULL; | |
682 | } | |
683 | EXPORT_SYMBOL(vga_switcheroo_fini_domain_pm_ops); | |
684 | ||
0d69704a DA |
685 | static int vga_switcheroo_runtime_resume_hdmi_audio(struct device *dev) |
686 | { | |
687 | struct pci_dev *pdev = to_pci_dev(dev); | |
688 | int ret; | |
689 | struct vga_switcheroo_client *client, *found = NULL; | |
690 | ||
691 | /* we need to check if we have to switch back on the video | |
692 | device so the audio device can come back */ | |
693 | list_for_each_entry(client, &vgasr_priv.clients, list) { | |
7491bfb4 TR |
694 | if (PCI_SLOT(client->pdev->devfn) == PCI_SLOT(pdev->devfn) && |
695 | client_is_vga(client)) { | |
0d69704a DA |
696 | found = client; |
697 | ret = pm_runtime_get_sync(&client->pdev->dev); | |
698 | if (ret) { | |
699 | if (ret != 1) | |
700 | return ret; | |
701 | } | |
702 | break; | |
703 | } | |
704 | } | |
705 | ret = dev->bus->pm->runtime_resume(dev); | |
706 | ||
707 | /* put the reference for the gpu */ | |
708 | if (found) { | |
709 | pm_runtime_mark_last_busy(&found->pdev->dev); | |
710 | pm_runtime_put_autosuspend(&found->pdev->dev); | |
711 | } | |
712 | return ret; | |
713 | } | |
714 | ||
7491bfb4 TR |
715 | int |
716 | vga_switcheroo_init_domain_pm_optimus_hdmi_audio(struct device *dev, | |
717 | struct dev_pm_domain *domain) | |
0d69704a DA |
718 | { |
719 | /* copy over all the bus versions */ | |
720 | if (dev->bus && dev->bus->pm) { | |
721 | domain->ops = *dev->bus->pm; | |
7491bfb4 TR |
722 | domain->ops.runtime_resume = |
723 | vga_switcheroo_runtime_resume_hdmi_audio; | |
0d69704a DA |
724 | |
725 | dev->pm_domain = domain; | |
726 | return 0; | |
727 | } | |
728 | dev->pm_domain = NULL; | |
729 | return -EINVAL; | |
730 | } | |
731 | EXPORT_SYMBOL(vga_switcheroo_init_domain_pm_optimus_hdmi_audio); |