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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 | |
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 | |
18 | */ | |
19 | ||
20 | #include <linux/module.h> | |
21 | #include <linux/dmi.h> | |
22 | #include <linux/seq_file.h> | |
23 | #include <linux/uaccess.h> | |
24 | #include <linux/fs.h> | |
25 | #include <linux/debugfs.h> | |
26 | #include <linux/fb.h> | |
27 | ||
6a9ee8af DA |
28 | #include <linux/pci.h> |
29 | #include <linux/vga_switcheroo.h> | |
30 | ||
31 | struct vga_switcheroo_client { | |
32 | struct pci_dev *pdev; | |
33 | struct fb_info *fb_info; | |
34 | int pwr_state; | |
35 | void (*set_gpu_state)(struct pci_dev *pdev, enum vga_switcheroo_state); | |
8d608aa6 | 36 | void (*reprobe)(struct pci_dev *pdev); |
6a9ee8af DA |
37 | bool (*can_switch)(struct pci_dev *pdev); |
38 | int id; | |
39 | bool active; | |
40 | }; | |
41 | ||
42 | static DEFINE_MUTEX(vgasr_mutex); | |
43 | ||
44 | struct vgasr_priv { | |
45 | ||
46 | bool active; | |
47 | bool delayed_switch_active; | |
48 | enum vga_switcheroo_client_id delayed_client_id; | |
49 | ||
50 | struct dentry *debugfs_root; | |
51 | struct dentry *switch_file; | |
52 | ||
53 | int registered_clients; | |
54 | struct vga_switcheroo_client clients[VGA_SWITCHEROO_MAX_CLIENTS]; | |
55 | ||
56 | struct vga_switcheroo_handler *handler; | |
57 | }; | |
58 | ||
59 | static int vga_switcheroo_debugfs_init(struct vgasr_priv *priv); | |
60 | static void vga_switcheroo_debugfs_fini(struct vgasr_priv *priv); | |
61 | ||
62 | /* only one switcheroo per system */ | |
63 | static struct vgasr_priv vgasr_priv; | |
64 | ||
65 | int vga_switcheroo_register_handler(struct vga_switcheroo_handler *handler) | |
66 | { | |
67 | mutex_lock(&vgasr_mutex); | |
68 | if (vgasr_priv.handler) { | |
69 | mutex_unlock(&vgasr_mutex); | |
70 | return -EINVAL; | |
71 | } | |
72 | ||
73 | vgasr_priv.handler = handler; | |
74 | mutex_unlock(&vgasr_mutex); | |
75 | return 0; | |
76 | } | |
77 | EXPORT_SYMBOL(vga_switcheroo_register_handler); | |
78 | ||
79 | void vga_switcheroo_unregister_handler(void) | |
80 | { | |
81 | mutex_lock(&vgasr_mutex); | |
82 | vgasr_priv.handler = NULL; | |
83 | mutex_unlock(&vgasr_mutex); | |
84 | } | |
85 | EXPORT_SYMBOL(vga_switcheroo_unregister_handler); | |
86 | ||
87 | static void vga_switcheroo_enable(void) | |
88 | { | |
89 | int i; | |
90 | int ret; | |
91 | /* call the handler to init */ | |
92 | vgasr_priv.handler->init(); | |
93 | ||
94 | for (i = 0; i < VGA_SWITCHEROO_MAX_CLIENTS; i++) { | |
95 | ret = vgasr_priv.handler->get_client_id(vgasr_priv.clients[i].pdev); | |
96 | if (ret < 0) | |
97 | return; | |
98 | ||
99 | vgasr_priv.clients[i].id = ret; | |
100 | } | |
101 | vga_switcheroo_debugfs_init(&vgasr_priv); | |
102 | vgasr_priv.active = true; | |
103 | } | |
104 | ||
105 | int vga_switcheroo_register_client(struct pci_dev *pdev, | |
106 | void (*set_gpu_state)(struct pci_dev *pdev, enum vga_switcheroo_state), | |
8d608aa6 | 107 | void (*reprobe)(struct pci_dev *pdev), |
6a9ee8af DA |
108 | bool (*can_switch)(struct pci_dev *pdev)) |
109 | { | |
110 | int index; | |
111 | ||
112 | mutex_lock(&vgasr_mutex); | |
113 | /* don't do IGD vs DIS here */ | |
114 | if (vgasr_priv.registered_clients & 1) | |
115 | index = 1; | |
116 | else | |
117 | index = 0; | |
118 | ||
119 | vgasr_priv.clients[index].pwr_state = VGA_SWITCHEROO_ON; | |
120 | vgasr_priv.clients[index].pdev = pdev; | |
121 | vgasr_priv.clients[index].set_gpu_state = set_gpu_state; | |
8d608aa6 | 122 | vgasr_priv.clients[index].reprobe = reprobe; |
6a9ee8af DA |
123 | vgasr_priv.clients[index].can_switch = can_switch; |
124 | vgasr_priv.clients[index].id = -1; | |
125 | if (pdev->resource[PCI_ROM_RESOURCE].flags & IORESOURCE_ROM_SHADOW) | |
126 | vgasr_priv.clients[index].active = true; | |
127 | ||
128 | vgasr_priv.registered_clients |= (1 << index); | |
129 | ||
130 | /* if we get two clients + handler */ | |
131 | if (vgasr_priv.registered_clients == 0x3 && vgasr_priv.handler) { | |
132 | printk(KERN_INFO "vga_switcheroo: enabled\n"); | |
133 | vga_switcheroo_enable(); | |
134 | } | |
135 | mutex_unlock(&vgasr_mutex); | |
136 | return 0; | |
137 | } | |
138 | EXPORT_SYMBOL(vga_switcheroo_register_client); | |
139 | ||
140 | void vga_switcheroo_unregister_client(struct pci_dev *pdev) | |
141 | { | |
142 | int i; | |
143 | ||
144 | mutex_lock(&vgasr_mutex); | |
145 | for (i = 0; i < VGA_SWITCHEROO_MAX_CLIENTS; i++) { | |
146 | if (vgasr_priv.clients[i].pdev == pdev) { | |
147 | vgasr_priv.registered_clients &= ~(1 << i); | |
148 | break; | |
149 | } | |
150 | } | |
151 | ||
152 | printk(KERN_INFO "vga_switcheroo: disabled\n"); | |
153 | vga_switcheroo_debugfs_fini(&vgasr_priv); | |
154 | vgasr_priv.active = false; | |
155 | mutex_unlock(&vgasr_mutex); | |
156 | } | |
157 | EXPORT_SYMBOL(vga_switcheroo_unregister_client); | |
158 | ||
159 | void vga_switcheroo_client_fb_set(struct pci_dev *pdev, | |
160 | struct fb_info *info) | |
161 | { | |
162 | int i; | |
163 | ||
164 | mutex_lock(&vgasr_mutex); | |
165 | for (i = 0; i < VGA_SWITCHEROO_MAX_CLIENTS; i++) { | |
166 | if (vgasr_priv.clients[i].pdev == pdev) { | |
167 | vgasr_priv.clients[i].fb_info = info; | |
168 | break; | |
169 | } | |
170 | } | |
171 | mutex_unlock(&vgasr_mutex); | |
172 | } | |
173 | EXPORT_SYMBOL(vga_switcheroo_client_fb_set); | |
174 | ||
175 | static int vga_switcheroo_show(struct seq_file *m, void *v) | |
176 | { | |
177 | int i; | |
178 | mutex_lock(&vgasr_mutex); | |
179 | for (i = 0; i < VGA_SWITCHEROO_MAX_CLIENTS; i++) { | |
6c2df40e DA |
180 | seq_printf(m, "%d:%s:%c:%s:%s\n", i, |
181 | vgasr_priv.clients[i].id == VGA_SWITCHEROO_DIS ? "DIS" : "IGD", | |
6a9ee8af DA |
182 | vgasr_priv.clients[i].active ? '+' : ' ', |
183 | vgasr_priv.clients[i].pwr_state ? "Pwr" : "Off", | |
184 | pci_name(vgasr_priv.clients[i].pdev)); | |
185 | } | |
186 | mutex_unlock(&vgasr_mutex); | |
187 | return 0; | |
188 | } | |
189 | ||
190 | static int vga_switcheroo_debugfs_open(struct inode *inode, struct file *file) | |
191 | { | |
192 | return single_open(file, vga_switcheroo_show, NULL); | |
193 | } | |
194 | ||
195 | static int vga_switchon(struct vga_switcheroo_client *client) | |
196 | { | |
5cfb3c3a DA |
197 | if (vgasr_priv.handler->power_state) |
198 | vgasr_priv.handler->power_state(client->id, VGA_SWITCHEROO_ON); | |
6a9ee8af DA |
199 | /* call the driver callback to turn on device */ |
200 | client->set_gpu_state(client->pdev, VGA_SWITCHEROO_ON); | |
201 | client->pwr_state = VGA_SWITCHEROO_ON; | |
202 | return 0; | |
203 | } | |
204 | ||
205 | static int vga_switchoff(struct vga_switcheroo_client *client) | |
206 | { | |
207 | /* call the driver callback to turn off device */ | |
208 | client->set_gpu_state(client->pdev, VGA_SWITCHEROO_OFF); | |
5cfb3c3a DA |
209 | if (vgasr_priv.handler->power_state) |
210 | vgasr_priv.handler->power_state(client->id, VGA_SWITCHEROO_OFF); | |
6a9ee8af DA |
211 | client->pwr_state = VGA_SWITCHEROO_OFF; |
212 | return 0; | |
213 | } | |
214 | ||
66b37c67 DA |
215 | /* stage one happens before delay */ |
216 | static int vga_switchto_stage1(struct vga_switcheroo_client *new_client) | |
6a9ee8af | 217 | { |
6a9ee8af DA |
218 | int i; |
219 | struct vga_switcheroo_client *active = NULL; | |
220 | ||
6a9ee8af DA |
221 | for (i = 0; i < VGA_SWITCHEROO_MAX_CLIENTS; i++) { |
222 | if (vgasr_priv.clients[i].active == true) { | |
223 | active = &vgasr_priv.clients[i]; | |
224 | break; | |
225 | } | |
226 | } | |
227 | if (!active) | |
228 | return 0; | |
229 | ||
6a9ee8af DA |
230 | if (new_client->pwr_state == VGA_SWITCHEROO_OFF) |
231 | vga_switchon(new_client); | |
232 | ||
233 | /* swap shadow resource to denote boot VGA device has changed so X starts on new device */ | |
6a9ee8af DA |
234 | active->pdev->resource[PCI_ROM_RESOURCE].flags &= ~IORESOURCE_ROM_SHADOW; |
235 | new_client->pdev->resource[PCI_ROM_RESOURCE].flags |= IORESOURCE_ROM_SHADOW; | |
66b37c67 DA |
236 | return 0; |
237 | } | |
238 | ||
239 | /* post delay */ | |
240 | static int vga_switchto_stage2(struct vga_switcheroo_client *new_client) | |
241 | { | |
242 | int ret; | |
243 | int i; | |
244 | struct vga_switcheroo_client *active = NULL; | |
245 | ||
246 | for (i = 0; i < VGA_SWITCHEROO_MAX_CLIENTS; i++) { | |
247 | if (vgasr_priv.clients[i].active == true) { | |
248 | active = &vgasr_priv.clients[i]; | |
249 | break; | |
250 | } | |
251 | } | |
252 | if (!active) | |
253 | return 0; | |
254 | ||
255 | active->active = false; | |
6a9ee8af DA |
256 | |
257 | if (new_client->fb_info) { | |
258 | struct fb_event event; | |
259 | event.info = new_client->fb_info; | |
260 | fb_notifier_call_chain(FB_EVENT_REMAP_ALL_CONSOLE, &event); | |
261 | } | |
262 | ||
263 | ret = vgasr_priv.handler->switchto(new_client->id); | |
264 | if (ret) | |
265 | return ret; | |
266 | ||
8d608aa6 DA |
267 | if (new_client->reprobe) |
268 | new_client->reprobe(new_client->pdev); | |
269 | ||
6a9ee8af DA |
270 | if (active->pwr_state == VGA_SWITCHEROO_ON) |
271 | vga_switchoff(active); | |
272 | ||
273 | new_client->active = true; | |
274 | return 0; | |
275 | } | |
276 | ||
277 | static ssize_t | |
278 | vga_switcheroo_debugfs_write(struct file *filp, const char __user *ubuf, | |
279 | size_t cnt, loff_t *ppos) | |
280 | { | |
281 | char usercmd[64]; | |
282 | const char *pdev_name; | |
283 | int i, ret; | |
284 | bool delay = false, can_switch; | |
851ab954 | 285 | bool just_mux = false; |
6a9ee8af DA |
286 | int client_id = -1; |
287 | struct vga_switcheroo_client *client = NULL; | |
288 | ||
289 | if (cnt > 63) | |
290 | cnt = 63; | |
291 | ||
292 | if (copy_from_user(usercmd, ubuf, cnt)) | |
293 | return -EFAULT; | |
294 | ||
295 | mutex_lock(&vgasr_mutex); | |
296 | ||
8c88e50b JS |
297 | if (!vgasr_priv.active) { |
298 | cnt = -EINVAL; | |
299 | goto out; | |
300 | } | |
6a9ee8af DA |
301 | |
302 | /* pwr off the device not in use */ | |
303 | if (strncmp(usercmd, "OFF", 3) == 0) { | |
304 | for (i = 0; i < VGA_SWITCHEROO_MAX_CLIENTS; i++) { | |
305 | if (vgasr_priv.clients[i].active) | |
306 | continue; | |
307 | if (vgasr_priv.clients[i].pwr_state == VGA_SWITCHEROO_ON) | |
308 | vga_switchoff(&vgasr_priv.clients[i]); | |
309 | } | |
310 | goto out; | |
311 | } | |
312 | /* pwr on the device not in use */ | |
313 | if (strncmp(usercmd, "ON", 2) == 0) { | |
314 | for (i = 0; i < VGA_SWITCHEROO_MAX_CLIENTS; i++) { | |
315 | if (vgasr_priv.clients[i].active) | |
316 | continue; | |
317 | if (vgasr_priv.clients[i].pwr_state == VGA_SWITCHEROO_OFF) | |
318 | vga_switchon(&vgasr_priv.clients[i]); | |
319 | } | |
320 | goto out; | |
321 | } | |
322 | ||
323 | /* request a delayed switch - test can we switch now */ | |
324 | if (strncmp(usercmd, "DIGD", 4) == 0) { | |
325 | client_id = VGA_SWITCHEROO_IGD; | |
326 | delay = true; | |
327 | } | |
328 | ||
329 | if (strncmp(usercmd, "DDIS", 4) == 0) { | |
330 | client_id = VGA_SWITCHEROO_DIS; | |
331 | delay = true; | |
332 | } | |
333 | ||
334 | if (strncmp(usercmd, "IGD", 3) == 0) | |
335 | client_id = VGA_SWITCHEROO_IGD; | |
336 | ||
337 | if (strncmp(usercmd, "DIS", 3) == 0) | |
338 | client_id = VGA_SWITCHEROO_DIS; | |
339 | ||
fea6f330 | 340 | if (strncmp(usercmd, "MIGD", 4) == 0) { |
851ab954 DA |
341 | just_mux = true; |
342 | client_id = VGA_SWITCHEROO_IGD; | |
343 | } | |
fea6f330 | 344 | if (strncmp(usercmd, "MDIS", 4) == 0) { |
851ab954 DA |
345 | just_mux = true; |
346 | client_id = VGA_SWITCHEROO_DIS; | |
347 | } | |
348 | ||
6a9ee8af DA |
349 | if (client_id == -1) |
350 | goto out; | |
351 | ||
352 | for (i = 0; i < VGA_SWITCHEROO_MAX_CLIENTS; i++) { | |
353 | if (vgasr_priv.clients[i].id == client_id) { | |
354 | client = &vgasr_priv.clients[i]; | |
355 | break; | |
356 | } | |
357 | } | |
358 | ||
359 | vgasr_priv.delayed_switch_active = false; | |
851ab954 DA |
360 | |
361 | if (just_mux) { | |
362 | ret = vgasr_priv.handler->switchto(client_id); | |
363 | goto out; | |
364 | } | |
365 | ||
a67b8887 FM |
366 | if (client->active == true) |
367 | goto out; | |
368 | ||
6a9ee8af DA |
369 | /* okay we want a switch - test if devices are willing to switch */ |
370 | can_switch = true; | |
371 | for (i = 0; i < VGA_SWITCHEROO_MAX_CLIENTS; i++) { | |
372 | can_switch = vgasr_priv.clients[i].can_switch(vgasr_priv.clients[i].pdev); | |
373 | if (can_switch == false) { | |
374 | printk(KERN_ERR "vga_switcheroo: client %d refused switch\n", i); | |
375 | break; | |
376 | } | |
377 | } | |
378 | ||
379 | if (can_switch == false && delay == false) | |
380 | goto out; | |
381 | ||
382 | if (can_switch == true) { | |
383 | pdev_name = pci_name(client->pdev); | |
66b37c67 DA |
384 | ret = vga_switchto_stage1(client); |
385 | if (ret) | |
386 | printk(KERN_ERR "vga_switcheroo: switching failed stage 1 %d\n", ret); | |
387 | ||
388 | ret = vga_switchto_stage2(client); | |
6a9ee8af | 389 | if (ret) |
66b37c67 DA |
390 | printk(KERN_ERR "vga_switcheroo: switching failed stage 2 %d\n", ret); |
391 | ||
6a9ee8af DA |
392 | } else { |
393 | printk(KERN_INFO "vga_switcheroo: setting delayed switch to client %d\n", client->id); | |
394 | vgasr_priv.delayed_switch_active = true; | |
395 | vgasr_priv.delayed_client_id = client_id; | |
396 | ||
66b37c67 DA |
397 | ret = vga_switchto_stage1(client); |
398 | if (ret) | |
399 | printk(KERN_ERR "vga_switcheroo: delayed switching stage 1 failed %d\n", ret); | |
6a9ee8af DA |
400 | } |
401 | ||
402 | out: | |
403 | mutex_unlock(&vgasr_mutex); | |
404 | return cnt; | |
405 | } | |
406 | ||
407 | static const struct file_operations vga_switcheroo_debugfs_fops = { | |
408 | .owner = THIS_MODULE, | |
409 | .open = vga_switcheroo_debugfs_open, | |
410 | .write = vga_switcheroo_debugfs_write, | |
411 | .read = seq_read, | |
412 | .llseek = seq_lseek, | |
413 | .release = single_release, | |
414 | }; | |
415 | ||
416 | static void vga_switcheroo_debugfs_fini(struct vgasr_priv *priv) | |
417 | { | |
418 | if (priv->switch_file) { | |
419 | debugfs_remove(priv->switch_file); | |
420 | priv->switch_file = NULL; | |
421 | } | |
422 | if (priv->debugfs_root) { | |
423 | debugfs_remove(priv->debugfs_root); | |
424 | priv->debugfs_root = NULL; | |
425 | } | |
426 | } | |
427 | ||
428 | static int vga_switcheroo_debugfs_init(struct vgasr_priv *priv) | |
429 | { | |
430 | /* already initialised */ | |
431 | if (priv->debugfs_root) | |
432 | return 0; | |
433 | priv->debugfs_root = debugfs_create_dir("vgaswitcheroo", NULL); | |
434 | ||
435 | if (!priv->debugfs_root) { | |
436 | printk(KERN_ERR "vga_switcheroo: Cannot create /sys/kernel/debug/vgaswitcheroo\n"); | |
437 | goto fail; | |
438 | } | |
439 | ||
440 | priv->switch_file = debugfs_create_file("switch", 0644, | |
441 | priv->debugfs_root, NULL, &vga_switcheroo_debugfs_fops); | |
442 | if (!priv->switch_file) { | |
443 | printk(KERN_ERR "vga_switcheroo: cannot create /sys/kernel/debug/vgaswitcheroo/switch\n"); | |
444 | goto fail; | |
445 | } | |
446 | return 0; | |
447 | fail: | |
448 | vga_switcheroo_debugfs_fini(priv); | |
449 | return -1; | |
450 | } | |
451 | ||
452 | int vga_switcheroo_process_delayed_switch(void) | |
453 | { | |
454 | struct vga_switcheroo_client *client = NULL; | |
455 | const char *pdev_name; | |
456 | bool can_switch = true; | |
457 | int i; | |
458 | int ret; | |
459 | int err = -EINVAL; | |
460 | ||
461 | mutex_lock(&vgasr_mutex); | |
462 | if (!vgasr_priv.delayed_switch_active) | |
463 | goto err; | |
464 | ||
465 | printk(KERN_INFO "vga_switcheroo: processing delayed switch to %d\n", vgasr_priv.delayed_client_id); | |
466 | ||
467 | for (i = 0; i < VGA_SWITCHEROO_MAX_CLIENTS; i++) { | |
468 | if (vgasr_priv.clients[i].id == vgasr_priv.delayed_client_id) | |
469 | client = &vgasr_priv.clients[i]; | |
470 | can_switch = vgasr_priv.clients[i].can_switch(vgasr_priv.clients[i].pdev); | |
471 | if (can_switch == false) { | |
472 | printk(KERN_ERR "vga_switcheroo: client %d refused switch\n", i); | |
473 | break; | |
474 | } | |
475 | } | |
476 | ||
477 | if (can_switch == false || client == NULL) | |
478 | goto err; | |
479 | ||
480 | pdev_name = pci_name(client->pdev); | |
66b37c67 | 481 | ret = vga_switchto_stage2(client); |
6a9ee8af | 482 | if (ret) |
66b37c67 | 483 | printk(KERN_ERR "vga_switcheroo: delayed switching failed stage 2 %d\n", ret); |
6a9ee8af DA |
484 | |
485 | vgasr_priv.delayed_switch_active = false; | |
486 | err = 0; | |
487 | err: | |
488 | mutex_unlock(&vgasr_mutex); | |
489 | return err; | |
490 | } | |
491 | EXPORT_SYMBOL(vga_switcheroo_process_delayed_switch); | |
492 |