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