Commit | Line | Data |
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6a9ee8af | 1 | /* |
a645654b LW |
2 | * vga_switcheroo.c - Support for laptop with dual GPU using one set of outputs |
3 | * | |
6a9ee8af DA |
4 | * Copyright (c) 2010 Red Hat Inc. |
5 | * Author : Dave Airlie <airlied@redhat.com> | |
6 | * | |
a645654b | 7 | * Copyright (c) 2015 Lukas Wunner <lukas@wunner.de> |
6a9ee8af | 8 | * |
a645654b LW |
9 | * Permission is hereby granted, free of charge, to any person obtaining a |
10 | * copy of this software and associated documentation files (the "Software"), | |
11 | * to deal in the Software without restriction, including without limitation | |
12 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, | |
13 | * and/or sell copies of the Software, and to permit persons to whom the | |
14 | * Software is furnished to do so, subject to the following conditions: | |
6a9ee8af | 15 | * |
a645654b LW |
16 | * The above copyright notice and this permission notice (including the next |
17 | * paragraph) shall be included in all copies or substantial portions of the | |
18 | * Software. | |
71309278 | 19 | * |
a645654b LW |
20 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
21 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
22 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
23 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
24 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING | |
25 | * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER | |
26 | * DEALINGS | |
27 | * IN THE SOFTWARE. | |
71309278 | 28 | * |
6a9ee8af DA |
29 | */ |
30 | ||
9b0be1eb TR |
31 | #define pr_fmt(fmt) "vga_switcheroo: " fmt |
32 | ||
4127838c | 33 | #include <linux/console.h> |
6a9ee8af DA |
34 | #include <linux/debugfs.h> |
35 | #include <linux/fb.h> | |
4127838c LW |
36 | #include <linux/fs.h> |
37 | #include <linux/module.h> | |
6a9ee8af | 38 | #include <linux/pci.h> |
989561de | 39 | #include <linux/pm_domain.h> |
0d69704a | 40 | #include <linux/pm_runtime.h> |
4127838c LW |
41 | #include <linux/seq_file.h> |
42 | #include <linux/uaccess.h> | |
2fbe8c7c | 43 | #include <linux/vgaarb.h> |
4127838c | 44 | #include <linux/vga_switcheroo.h> |
2fbe8c7c | 45 | |
a645654b LW |
46 | /** |
47 | * DOC: Overview | |
48 | * | |
49 | * vga_switcheroo is the Linux subsystem for laptop hybrid graphics. | |
50 | * These come in two flavors: | |
51 | * | |
52 | * * muxed: Dual GPUs with a multiplexer chip to switch outputs between GPUs. | |
53 | * * muxless: Dual GPUs but only one of them is connected to outputs. | |
54 | * The other one is merely used to offload rendering, its results | |
55 | * are copied over PCIe into the framebuffer. On Linux this is | |
56 | * supported with DRI PRIME. | |
57 | * | |
58 | * Hybrid graphics started to appear in the late Naughties and were initially | |
59 | * all muxed. Newer laptops moved to a muxless architecture for cost reasons. | |
60 | * A notable exception is the MacBook Pro which continues to use a mux. | |
61 | * Muxes come with varying capabilities: Some switch only the panel, others | |
62 | * can also switch external displays. Some switch all display pins at once | |
63 | * while others can switch just the DDC lines. (To allow EDID probing | |
64 | * for the inactive GPU.) Also, muxes are often used to cut power to the | |
65 | * discrete GPU while it is not used. | |
66 | * | |
3a848662 | 67 | * DRM drivers register GPUs with vga_switcheroo, these are henceforth called |
a645654b LW |
68 | * clients. The mux is called the handler. Muxless machines also register a |
69 | * handler to control the power state of the discrete GPU, its ->switchto | |
70 | * callback is a no-op for obvious reasons. The discrete GPU is often equipped | |
71 | * with an HDA controller for the HDMI/DP audio signal, this will also | |
72 | * register as a client so that vga_switcheroo can take care of the correct | |
73 | * suspend/resume order when changing the discrete GPU's power state. In total | |
74 | * there can thus be up to three clients: Two vga clients (GPUs) and one audio | |
75 | * client (on the discrete GPU). The code is mostly prepared to support | |
76 | * machines with more than two GPUs should they become available. | |
e4cb81d7 | 77 | * |
a645654b LW |
78 | * The GPU to which the outputs are currently switched is called the |
79 | * active client in vga_switcheroo parlance. The GPU not in use is the | |
e4cb81d7 LW |
80 | * inactive client. When the inactive client's DRM driver is loaded, |
81 | * it will be unable to probe the panel's EDID and hence depends on | |
82 | * VBIOS to provide its display modes. If the VBIOS modes are bogus or | |
83 | * if there is no VBIOS at all (which is common on the MacBook Pro), | |
84 | * a client may alternatively request that the DDC lines are temporarily | |
85 | * switched to it, provided that the handler supports this. Switching | |
86 | * only the DDC lines and not the entire output avoids unnecessary | |
87 | * flickering. | |
a645654b LW |
88 | */ |
89 | ||
90 | /** | |
91 | * struct vga_switcheroo_client - registered client | |
92 | * @pdev: client pci device | |
93 | * @fb_info: framebuffer to which console is remapped on switching | |
94 | * @pwr_state: current power state | |
95 | * @ops: client callbacks | |
21c5ba8c LW |
96 | * @id: client identifier. Determining the id requires the handler, |
97 | * so gpus are initially assigned VGA_SWITCHEROO_UNKNOWN_ID | |
98 | * and later given their true id in vga_switcheroo_enable() | |
a645654b LW |
99 | * @active: whether the outputs are currently switched to this client |
100 | * @driver_power_control: whether power state is controlled by the driver's | |
101 | * runtime pm. If true, writing ON and OFF to the vga_switcheroo debugfs | |
102 | * interface is a no-op so as not to interfere with runtime pm | |
103 | * @list: client list | |
104 | * | |
105 | * Registered client. A client can be either a GPU or an audio device on a GPU. | |
106 | * For audio clients, the @fb_info, @active and @driver_power_control members | |
107 | * are bogus. | |
108 | */ | |
6a9ee8af DA |
109 | struct vga_switcheroo_client { |
110 | struct pci_dev *pdev; | |
111 | struct fb_info *fb_info; | |
203d027d | 112 | enum vga_switcheroo_state pwr_state; |
26ec685f | 113 | const struct vga_switcheroo_client_ops *ops; |
fa3e967f | 114 | enum vga_switcheroo_client_id id; |
6a9ee8af | 115 | bool active; |
0d69704a | 116 | bool driver_power_control; |
79721e0a | 117 | struct list_head list; |
6a9ee8af DA |
118 | }; |
119 | ||
a645654b LW |
120 | /* |
121 | * protects access to struct vgasr_priv | |
122 | */ | |
6a9ee8af DA |
123 | static DEFINE_MUTEX(vgasr_mutex); |
124 | ||
a645654b LW |
125 | /** |
126 | * struct vgasr_priv - vga_switcheroo private data | |
127 | * @active: whether vga_switcheroo is enabled. | |
128 | * Prerequisite is the registration of two GPUs and a handler | |
129 | * @delayed_switch_active: whether a delayed switch is pending | |
130 | * @delayed_client_id: client to which a delayed switch is pending | |
131 | * @debugfs_root: directory for vga_switcheroo debugfs interface | |
132 | * @switch_file: file for vga_switcheroo debugfs interface | |
133 | * @registered_clients: number of registered GPUs | |
134 | * (counting only vga clients, not audio clients) | |
135 | * @clients: list of registered clients | |
136 | * @handler: registered handler | |
156d7d41 | 137 | * @handler_flags: flags of registered handler |
e4cb81d7 LW |
138 | * @mux_hw_lock: protects mux state |
139 | * (in particular while DDC lines are temporarily switched) | |
140 | * @old_ddc_owner: client to which DDC lines will be switched back on unlock | |
a645654b LW |
141 | * |
142 | * vga_switcheroo private data. Currently only one vga_switcheroo instance | |
143 | * per system is supported. | |
144 | */ | |
6a9ee8af | 145 | struct vgasr_priv { |
6a9ee8af DA |
146 | bool active; |
147 | bool delayed_switch_active; | |
148 | enum vga_switcheroo_client_id delayed_client_id; | |
149 | ||
150 | struct dentry *debugfs_root; | |
151 | struct dentry *switch_file; | |
152 | ||
153 | int registered_clients; | |
79721e0a | 154 | struct list_head clients; |
6a9ee8af | 155 | |
5d170139 | 156 | const struct vga_switcheroo_handler *handler; |
156d7d41 | 157 | enum vga_switcheroo_handler_flags_t handler_flags; |
e4cb81d7 LW |
158 | struct mutex mux_hw_lock; |
159 | int old_ddc_owner; | |
6a9ee8af DA |
160 | }; |
161 | ||
3e9e63db TI |
162 | #define ID_BIT_AUDIO 0x100 |
163 | #define client_is_audio(c) ((c)->id & ID_BIT_AUDIO) | |
21c5ba8c LW |
164 | #define client_is_vga(c) ((c)->id == VGA_SWITCHEROO_UNKNOWN_ID || \ |
165 | !client_is_audio(c)) | |
3e9e63db TI |
166 | #define client_id(c) ((c)->id & ~ID_BIT_AUDIO) |
167 | ||
6a9ee8af DA |
168 | static int vga_switcheroo_debugfs_init(struct vgasr_priv *priv); |
169 | static void vga_switcheroo_debugfs_fini(struct vgasr_priv *priv); | |
170 | ||
171 | /* only one switcheroo per system */ | |
79721e0a TI |
172 | static struct vgasr_priv vgasr_priv = { |
173 | .clients = LIST_HEAD_INIT(vgasr_priv.clients), | |
e4cb81d7 | 174 | .mux_hw_lock = __MUTEX_INITIALIZER(vgasr_priv.mux_hw_lock), |
79721e0a | 175 | }; |
6a9ee8af | 176 | |
36704c0c | 177 | static bool vga_switcheroo_ready(void) |
6a9ee8af | 178 | { |
36704c0c SF |
179 | /* we're ready if we get two clients + handler */ |
180 | return !vgasr_priv.active && | |
181 | vgasr_priv.registered_clients == 2 && vgasr_priv.handler; | |
6a9ee8af | 182 | } |
6a9ee8af DA |
183 | |
184 | static void vga_switcheroo_enable(void) | |
185 | { | |
6a9ee8af | 186 | int ret; |
79721e0a TI |
187 | struct vga_switcheroo_client *client; |
188 | ||
6a9ee8af | 189 | /* call the handler to init */ |
e99eac5e SF |
190 | if (vgasr_priv.handler->init) |
191 | vgasr_priv.handler->init(); | |
6a9ee8af | 192 | |
79721e0a | 193 | list_for_each_entry(client, &vgasr_priv.clients, list) { |
21c5ba8c | 194 | if (client->id != VGA_SWITCHEROO_UNKNOWN_ID) |
3e9e63db | 195 | continue; |
79721e0a | 196 | ret = vgasr_priv.handler->get_client_id(client->pdev); |
6a9ee8af DA |
197 | if (ret < 0) |
198 | return; | |
199 | ||
79721e0a | 200 | client->id = ret; |
6a9ee8af DA |
201 | } |
202 | vga_switcheroo_debugfs_init(&vgasr_priv); | |
203 | vgasr_priv.active = true; | |
204 | } | |
205 | ||
a645654b LW |
206 | /** |
207 | * vga_switcheroo_register_handler() - register handler | |
208 | * @handler: handler callbacks | |
156d7d41 | 209 | * @handler_flags: handler flags |
a645654b LW |
210 | * |
211 | * Register handler. Enable vga_switcheroo if two vga clients have already | |
212 | * registered. | |
213 | * | |
214 | * Return: 0 on success, -EINVAL if a handler was already registered. | |
215 | */ | |
156d7d41 LW |
216 | int vga_switcheroo_register_handler(const struct vga_switcheroo_handler *handler, |
217 | enum vga_switcheroo_handler_flags_t handler_flags) | |
36704c0c SF |
218 | { |
219 | mutex_lock(&vgasr_mutex); | |
220 | if (vgasr_priv.handler) { | |
221 | mutex_unlock(&vgasr_mutex); | |
222 | return -EINVAL; | |
223 | } | |
224 | ||
225 | vgasr_priv.handler = handler; | |
156d7d41 | 226 | vgasr_priv.handler_flags = handler_flags; |
36704c0c | 227 | if (vga_switcheroo_ready()) { |
9b0be1eb | 228 | pr_info("enabled\n"); |
36704c0c SF |
229 | vga_switcheroo_enable(); |
230 | } | |
231 | mutex_unlock(&vgasr_mutex); | |
232 | return 0; | |
233 | } | |
234 | EXPORT_SYMBOL(vga_switcheroo_register_handler); | |
235 | ||
a645654b LW |
236 | /** |
237 | * vga_switcheroo_unregister_handler() - unregister handler | |
238 | * | |
239 | * Unregister handler. Disable vga_switcheroo. | |
240 | */ | |
36704c0c SF |
241 | void vga_switcheroo_unregister_handler(void) |
242 | { | |
243 | mutex_lock(&vgasr_mutex); | |
e4cb81d7 | 244 | mutex_lock(&vgasr_priv.mux_hw_lock); |
156d7d41 | 245 | vgasr_priv.handler_flags = 0; |
36704c0c SF |
246 | vgasr_priv.handler = NULL; |
247 | if (vgasr_priv.active) { | |
9b0be1eb | 248 | pr_info("disabled\n"); |
36704c0c SF |
249 | vga_switcheroo_debugfs_fini(&vgasr_priv); |
250 | vgasr_priv.active = false; | |
251 | } | |
e4cb81d7 | 252 | mutex_unlock(&vgasr_priv.mux_hw_lock); |
36704c0c SF |
253 | mutex_unlock(&vgasr_mutex); |
254 | } | |
255 | EXPORT_SYMBOL(vga_switcheroo_unregister_handler); | |
256 | ||
156d7d41 LW |
257 | /** |
258 | * vga_switcheroo_handler_flags() - obtain handler flags | |
259 | * | |
260 | * Helper for clients to obtain the handler flags bitmask. | |
261 | * | |
262 | * Return: Handler flags. A value of 0 means that no handler is registered | |
263 | * or that the handler has no special capabilities. | |
264 | */ | |
265 | enum vga_switcheroo_handler_flags_t vga_switcheroo_handler_flags(void) | |
266 | { | |
267 | return vgasr_priv.handler_flags; | |
268 | } | |
269 | EXPORT_SYMBOL(vga_switcheroo_handler_flags); | |
270 | ||
3e9e63db TI |
271 | static int register_client(struct pci_dev *pdev, |
272 | const struct vga_switcheroo_client_ops *ops, | |
fa3e967f LW |
273 | enum vga_switcheroo_client_id id, bool active, |
274 | bool driver_power_control) | |
6a9ee8af | 275 | { |
79721e0a | 276 | struct vga_switcheroo_client *client; |
6a9ee8af | 277 | |
79721e0a TI |
278 | client = kzalloc(sizeof(*client), GFP_KERNEL); |
279 | if (!client) | |
280 | return -ENOMEM; | |
281 | ||
282 | client->pwr_state = VGA_SWITCHEROO_ON; | |
283 | client->pdev = pdev; | |
26ec685f | 284 | client->ops = ops; |
3e9e63db TI |
285 | client->id = id; |
286 | client->active = active; | |
0d69704a | 287 | client->driver_power_control = driver_power_control; |
6a9ee8af | 288 | |
79721e0a TI |
289 | mutex_lock(&vgasr_mutex); |
290 | list_add_tail(&client->list, &vgasr_priv.clients); | |
3e9e63db TI |
291 | if (client_is_vga(client)) |
292 | vgasr_priv.registered_clients++; | |
6a9ee8af | 293 | |
36704c0c | 294 | if (vga_switcheroo_ready()) { |
9b0be1eb | 295 | pr_info("enabled\n"); |
6a9ee8af DA |
296 | vga_switcheroo_enable(); |
297 | } | |
298 | mutex_unlock(&vgasr_mutex); | |
299 | return 0; | |
300 | } | |
3e9e63db | 301 | |
a645654b LW |
302 | /** |
303 | * vga_switcheroo_register_client - register vga client | |
304 | * @pdev: client pci device | |
305 | * @ops: client callbacks | |
306 | * @driver_power_control: whether power state is controlled by the driver's | |
307 | * runtime pm | |
308 | * | |
309 | * Register vga client (GPU). Enable vga_switcheroo if another GPU and a | |
310 | * handler have already registered. The power state of the client is assumed | |
311 | * to be ON. | |
312 | * | |
313 | * Return: 0 on success, -ENOMEM on memory allocation error. | |
314 | */ | |
3e9e63db | 315 | int vga_switcheroo_register_client(struct pci_dev *pdev, |
0d69704a DA |
316 | const struct vga_switcheroo_client_ops *ops, |
317 | bool driver_power_control) | |
3e9e63db | 318 | { |
21c5ba8c | 319 | return register_client(pdev, ops, VGA_SWITCHEROO_UNKNOWN_ID, |
7491bfb4 TR |
320 | pdev == vga_default_device(), |
321 | driver_power_control); | |
3e9e63db | 322 | } |
6a9ee8af DA |
323 | EXPORT_SYMBOL(vga_switcheroo_register_client); |
324 | ||
a645654b LW |
325 | /** |
326 | * vga_switcheroo_register_audio_client - register audio client | |
327 | * @pdev: client pci device | |
328 | * @ops: client callbacks | |
fa3e967f | 329 | * @id: client identifier |
a645654b LW |
330 | * |
331 | * Register audio client (audio device on a GPU). The power state of the | |
332 | * client is assumed to be ON. | |
333 | * | |
334 | * Return: 0 on success, -ENOMEM on memory allocation error. | |
335 | */ | |
3e9e63db TI |
336 | int vga_switcheroo_register_audio_client(struct pci_dev *pdev, |
337 | const struct vga_switcheroo_client_ops *ops, | |
fa3e967f | 338 | enum vga_switcheroo_client_id id) |
3e9e63db | 339 | { |
21b45676 | 340 | return register_client(pdev, ops, id | ID_BIT_AUDIO, false, false); |
3e9e63db TI |
341 | } |
342 | EXPORT_SYMBOL(vga_switcheroo_register_audio_client); | |
343 | ||
79721e0a TI |
344 | static struct vga_switcheroo_client * |
345 | find_client_from_pci(struct list_head *head, struct pci_dev *pdev) | |
346 | { | |
347 | struct vga_switcheroo_client *client; | |
7491bfb4 | 348 | |
79721e0a TI |
349 | list_for_each_entry(client, head, list) |
350 | if (client->pdev == pdev) | |
351 | return client; | |
352 | return NULL; | |
353 | } | |
354 | ||
355 | static struct vga_switcheroo_client * | |
fa3e967f LW |
356 | find_client_from_id(struct list_head *head, |
357 | enum vga_switcheroo_client_id client_id) | |
79721e0a TI |
358 | { |
359 | struct vga_switcheroo_client *client; | |
7491bfb4 | 360 | |
79721e0a TI |
361 | list_for_each_entry(client, head, list) |
362 | if (client->id == client_id) | |
363 | return client; | |
364 | return NULL; | |
365 | } | |
366 | ||
367 | static struct vga_switcheroo_client * | |
368 | find_active_client(struct list_head *head) | |
369 | { | |
370 | struct vga_switcheroo_client *client; | |
7491bfb4 | 371 | |
79721e0a | 372 | list_for_each_entry(client, head, list) |
21b45676 | 373 | if (client->active) |
79721e0a TI |
374 | return client; |
375 | return NULL; | |
376 | } | |
377 | ||
a645654b LW |
378 | /** |
379 | * vga_switcheroo_get_client_state() - obtain power state of a given client | |
380 | * @pdev: client pci device | |
381 | * | |
382 | * Obtain power state of a given client as seen from vga_switcheroo. | |
383 | * The function is only called from hda_intel.c. | |
384 | * | |
385 | * Return: Power state. | |
386 | */ | |
203d027d | 387 | enum vga_switcheroo_state vga_switcheroo_get_client_state(struct pci_dev *pdev) |
c8e9cf7b TI |
388 | { |
389 | struct vga_switcheroo_client *client; | |
8f12a311 | 390 | enum vga_switcheroo_state ret; |
c8e9cf7b | 391 | |
8f12a311 | 392 | mutex_lock(&vgasr_mutex); |
c8e9cf7b TI |
393 | client = find_client_from_pci(&vgasr_priv.clients, pdev); |
394 | if (!client) | |
8f12a311 | 395 | ret = VGA_SWITCHEROO_NOT_FOUND; |
8f12a311 LW |
396 | else |
397 | ret = client->pwr_state; | |
398 | mutex_unlock(&vgasr_mutex); | |
399 | return ret; | |
c8e9cf7b TI |
400 | } |
401 | EXPORT_SYMBOL(vga_switcheroo_get_client_state); | |
402 | ||
a645654b LW |
403 | /** |
404 | * vga_switcheroo_unregister_client() - unregister client | |
405 | * @pdev: client pci device | |
406 | * | |
407 | * Unregister client. Disable vga_switcheroo if this is a vga client (GPU). | |
408 | */ | |
6a9ee8af DA |
409 | void vga_switcheroo_unregister_client(struct pci_dev *pdev) |
410 | { | |
79721e0a | 411 | struct vga_switcheroo_client *client; |
6a9ee8af DA |
412 | |
413 | mutex_lock(&vgasr_mutex); | |
79721e0a TI |
414 | client = find_client_from_pci(&vgasr_priv.clients, pdev); |
415 | if (client) { | |
3e9e63db TI |
416 | if (client_is_vga(client)) |
417 | vgasr_priv.registered_clients--; | |
79721e0a TI |
418 | list_del(&client->list); |
419 | kfree(client); | |
6a9ee8af | 420 | } |
3e9e63db | 421 | if (vgasr_priv.active && vgasr_priv.registered_clients < 2) { |
9b0be1eb | 422 | pr_info("disabled\n"); |
3e9e63db TI |
423 | vga_switcheroo_debugfs_fini(&vgasr_priv); |
424 | vgasr_priv.active = false; | |
425 | } | |
6a9ee8af DA |
426 | mutex_unlock(&vgasr_mutex); |
427 | } | |
428 | EXPORT_SYMBOL(vga_switcheroo_unregister_client); | |
429 | ||
a645654b LW |
430 | /** |
431 | * vga_switcheroo_client_fb_set() - set framebuffer of a given client | |
432 | * @pdev: client pci device | |
433 | * @info: framebuffer | |
434 | * | |
435 | * Set framebuffer of a given client. The console will be remapped to this | |
436 | * on switching. | |
437 | */ | |
6a9ee8af DA |
438 | void vga_switcheroo_client_fb_set(struct pci_dev *pdev, |
439 | struct fb_info *info) | |
440 | { | |
79721e0a | 441 | struct vga_switcheroo_client *client; |
6a9ee8af DA |
442 | |
443 | mutex_lock(&vgasr_mutex); | |
79721e0a TI |
444 | client = find_client_from_pci(&vgasr_priv.clients, pdev); |
445 | if (client) | |
446 | client->fb_info = info; | |
6a9ee8af DA |
447 | mutex_unlock(&vgasr_mutex); |
448 | } | |
449 | EXPORT_SYMBOL(vga_switcheroo_client_fb_set); | |
450 | ||
e4cb81d7 LW |
451 | /** |
452 | * vga_switcheroo_lock_ddc() - temporarily switch DDC lines to a given client | |
453 | * @pdev: client pci device | |
454 | * | |
455 | * Temporarily switch DDC lines to the client identified by @pdev | |
456 | * (but leave the outputs otherwise switched to where they are). | |
457 | * This allows the inactive client to probe EDID. The DDC lines must | |
458 | * afterwards be switched back by calling vga_switcheroo_unlock_ddc(), | |
459 | * even if this function returns an error. | |
460 | * | |
461 | * Return: Previous DDC owner on success or a negative int on error. | |
462 | * Specifically, %-ENODEV if no handler has registered or if the handler | |
463 | * does not support switching the DDC lines. Also, a negative value | |
464 | * returned by the handler is propagated back to the caller. | |
465 | * The return value has merely an informational purpose for any caller | |
466 | * which might be interested in it. It is acceptable to ignore the return | |
467 | * value and simply rely on the result of the subsequent EDID probe, | |
468 | * which will be %NULL if DDC switching failed. | |
469 | */ | |
470 | int vga_switcheroo_lock_ddc(struct pci_dev *pdev) | |
471 | { | |
472 | enum vga_switcheroo_client_id id; | |
473 | ||
474 | mutex_lock(&vgasr_priv.mux_hw_lock); | |
475 | if (!vgasr_priv.handler || !vgasr_priv.handler->switch_ddc) { | |
476 | vgasr_priv.old_ddc_owner = -ENODEV; | |
477 | return -ENODEV; | |
478 | } | |
479 | ||
480 | id = vgasr_priv.handler->get_client_id(pdev); | |
481 | vgasr_priv.old_ddc_owner = vgasr_priv.handler->switch_ddc(id); | |
482 | return vgasr_priv.old_ddc_owner; | |
483 | } | |
484 | EXPORT_SYMBOL(vga_switcheroo_lock_ddc); | |
485 | ||
486 | /** | |
487 | * vga_switcheroo_unlock_ddc() - switch DDC lines back to previous owner | |
488 | * @pdev: client pci device | |
489 | * | |
490 | * Switch DDC lines back to the previous owner after calling | |
491 | * vga_switcheroo_lock_ddc(). This must be called even if | |
492 | * vga_switcheroo_lock_ddc() returned an error. | |
493 | * | |
494 | * Return: Previous DDC owner on success (i.e. the client identifier of @pdev) | |
495 | * or a negative int on error. | |
496 | * Specifically, %-ENODEV if no handler has registered or if the handler | |
497 | * does not support switching the DDC lines. Also, a negative value | |
498 | * returned by the handler is propagated back to the caller. | |
499 | * Finally, invoking this function without calling vga_switcheroo_lock_ddc() | |
500 | * first is not allowed and will result in %-EINVAL. | |
501 | */ | |
502 | int vga_switcheroo_unlock_ddc(struct pci_dev *pdev) | |
503 | { | |
504 | enum vga_switcheroo_client_id id; | |
505 | int ret = vgasr_priv.old_ddc_owner; | |
506 | ||
507 | if (WARN_ON_ONCE(!mutex_is_locked(&vgasr_priv.mux_hw_lock))) | |
508 | return -EINVAL; | |
509 | ||
510 | if (vgasr_priv.old_ddc_owner >= 0) { | |
511 | id = vgasr_priv.handler->get_client_id(pdev); | |
512 | if (vgasr_priv.old_ddc_owner != id) | |
513 | ret = vgasr_priv.handler->switch_ddc( | |
514 | vgasr_priv.old_ddc_owner); | |
515 | } | |
516 | mutex_unlock(&vgasr_priv.mux_hw_lock); | |
517 | return ret; | |
518 | } | |
519 | EXPORT_SYMBOL(vga_switcheroo_unlock_ddc); | |
520 | ||
a645654b LW |
521 | /** |
522 | * DOC: Manual switching and manual power control | |
523 | * | |
524 | * In this mode of use, the file /sys/kernel/debug/vgaswitcheroo/switch | |
525 | * can be read to retrieve the current vga_switcheroo state and commands | |
526 | * can be written to it to change the state. The file appears as soon as | |
527 | * two GPU drivers and one handler have registered with vga_switcheroo. | |
528 | * The following commands are understood: | |
529 | * | |
530 | * * OFF: Power off the device not in use. | |
531 | * * ON: Power on the device not in use. | |
532 | * * IGD: Switch to the integrated graphics device. | |
533 | * Power on the integrated GPU if necessary, power off the discrete GPU. | |
534 | * Prerequisite is that no user space processes (e.g. Xorg, alsactl) | |
535 | * have opened device files of the GPUs or the audio client. If the | |
536 | * switch fails, the user may invoke lsof(8) or fuser(1) on /dev/dri/ | |
537 | * and /dev/snd/controlC1 to identify processes blocking the switch. | |
538 | * * DIS: Switch to the discrete graphics device. | |
539 | * * DIGD: Delayed switch to the integrated graphics device. | |
540 | * This will perform the switch once the last user space process has | |
541 | * closed the device files of the GPUs and the audio client. | |
542 | * * DDIS: Delayed switch to the discrete graphics device. | |
543 | * * MIGD: Mux-only switch to the integrated graphics device. | |
544 | * Does not remap console or change the power state of either gpu. | |
545 | * If the integrated GPU is currently off, the screen will turn black. | |
546 | * If it is on, the screen will show whatever happens to be in VRAM. | |
547 | * Either way, the user has to blindly enter the command to switch back. | |
548 | * * MDIS: Mux-only switch to the discrete graphics device. | |
549 | * | |
550 | * For GPUs whose power state is controlled by the driver's runtime pm, | |
551 | * the ON and OFF commands are a no-op (see next section). | |
552 | * | |
553 | * For muxless machines, the IGD/DIS, DIGD/DDIS and MIGD/MDIS commands | |
554 | * should not be used. | |
555 | */ | |
556 | ||
6a9ee8af DA |
557 | static int vga_switcheroo_show(struct seq_file *m, void *v) |
558 | { | |
79721e0a TI |
559 | struct vga_switcheroo_client *client; |
560 | int i = 0; | |
7491bfb4 | 561 | |
6a9ee8af | 562 | mutex_lock(&vgasr_mutex); |
79721e0a | 563 | list_for_each_entry(client, &vgasr_priv.clients, list) { |
0d69704a | 564 | seq_printf(m, "%d:%s%s:%c:%s%s:%s\n", i, |
7491bfb4 TR |
565 | client_id(client) == VGA_SWITCHEROO_DIS ? "DIS" : |
566 | "IGD", | |
3e9e63db | 567 | client_is_vga(client) ? "" : "-Audio", |
79721e0a | 568 | client->active ? '+' : ' ', |
0d69704a | 569 | client->driver_power_control ? "Dyn" : "", |
79721e0a TI |
570 | client->pwr_state ? "Pwr" : "Off", |
571 | pci_name(client->pdev)); | |
572 | i++; | |
6a9ee8af DA |
573 | } |
574 | mutex_unlock(&vgasr_mutex); | |
575 | return 0; | |
576 | } | |
577 | ||
578 | static int vga_switcheroo_debugfs_open(struct inode *inode, struct file *file) | |
579 | { | |
580 | return single_open(file, vga_switcheroo_show, NULL); | |
581 | } | |
582 | ||
583 | static int vga_switchon(struct vga_switcheroo_client *client) | |
584 | { | |
0d69704a DA |
585 | if (client->driver_power_control) |
586 | return 0; | |
5cfb3c3a DA |
587 | if (vgasr_priv.handler->power_state) |
588 | vgasr_priv.handler->power_state(client->id, VGA_SWITCHEROO_ON); | |
6a9ee8af | 589 | /* call the driver callback to turn on device */ |
26ec685f | 590 | client->ops->set_gpu_state(client->pdev, VGA_SWITCHEROO_ON); |
6a9ee8af DA |
591 | client->pwr_state = VGA_SWITCHEROO_ON; |
592 | return 0; | |
593 | } | |
594 | ||
595 | static int vga_switchoff(struct vga_switcheroo_client *client) | |
596 | { | |
0d69704a DA |
597 | if (client->driver_power_control) |
598 | return 0; | |
6a9ee8af | 599 | /* call the driver callback to turn off device */ |
26ec685f | 600 | client->ops->set_gpu_state(client->pdev, VGA_SWITCHEROO_OFF); |
5cfb3c3a DA |
601 | if (vgasr_priv.handler->power_state) |
602 | vgasr_priv.handler->power_state(client->id, VGA_SWITCHEROO_OFF); | |
6a9ee8af DA |
603 | client->pwr_state = VGA_SWITCHEROO_OFF; |
604 | return 0; | |
605 | } | |
606 | ||
fa3e967f LW |
607 | static void set_audio_state(enum vga_switcheroo_client_id id, |
608 | enum vga_switcheroo_state state) | |
3e9e63db TI |
609 | { |
610 | struct vga_switcheroo_client *client; | |
611 | ||
612 | client = find_client_from_id(&vgasr_priv.clients, id | ID_BIT_AUDIO); | |
613 | if (client && client->pwr_state != state) { | |
614 | client->ops->set_gpu_state(client->pdev, state); | |
615 | client->pwr_state = state; | |
616 | } | |
617 | } | |
618 | ||
66b37c67 DA |
619 | /* stage one happens before delay */ |
620 | static int vga_switchto_stage1(struct vga_switcheroo_client *new_client) | |
6a9ee8af | 621 | { |
79721e0a | 622 | struct vga_switcheroo_client *active; |
6a9ee8af | 623 | |
79721e0a | 624 | active = find_active_client(&vgasr_priv.clients); |
6a9ee8af DA |
625 | if (!active) |
626 | return 0; | |
627 | ||
6a9ee8af DA |
628 | if (new_client->pwr_state == VGA_SWITCHEROO_OFF) |
629 | vga_switchon(new_client); | |
630 | ||
2fbe8c7c | 631 | vga_set_default_device(new_client->pdev); |
66b37c67 DA |
632 | return 0; |
633 | } | |
634 | ||
635 | /* post delay */ | |
636 | static int vga_switchto_stage2(struct vga_switcheroo_client *new_client) | |
637 | { | |
638 | int ret; | |
79721e0a | 639 | struct vga_switcheroo_client *active; |
66b37c67 | 640 | |
79721e0a | 641 | active = find_active_client(&vgasr_priv.clients); |
66b37c67 DA |
642 | if (!active) |
643 | return 0; | |
644 | ||
645 | active->active = false; | |
6a9ee8af | 646 | |
c91c3fae TI |
647 | set_audio_state(active->id, VGA_SWITCHEROO_OFF); |
648 | ||
6a9ee8af DA |
649 | if (new_client->fb_info) { |
650 | struct fb_event event; | |
7491bfb4 | 651 | |
054430e7 | 652 | console_lock(); |
6a9ee8af DA |
653 | event.info = new_client->fb_info; |
654 | fb_notifier_call_chain(FB_EVENT_REMAP_ALL_CONSOLE, &event); | |
054430e7 | 655 | console_unlock(); |
6a9ee8af DA |
656 | } |
657 | ||
e4cb81d7 | 658 | mutex_lock(&vgasr_priv.mux_hw_lock); |
6a9ee8af | 659 | ret = vgasr_priv.handler->switchto(new_client->id); |
e4cb81d7 | 660 | mutex_unlock(&vgasr_priv.mux_hw_lock); |
6a9ee8af DA |
661 | if (ret) |
662 | return ret; | |
663 | ||
26ec685f TI |
664 | if (new_client->ops->reprobe) |
665 | new_client->ops->reprobe(new_client->pdev); | |
8d608aa6 | 666 | |
6a9ee8af DA |
667 | if (active->pwr_state == VGA_SWITCHEROO_ON) |
668 | vga_switchoff(active); | |
669 | ||
c91c3fae TI |
670 | set_audio_state(new_client->id, VGA_SWITCHEROO_ON); |
671 | ||
6a9ee8af DA |
672 | new_client->active = true; |
673 | return 0; | |
674 | } | |
675 | ||
79721e0a TI |
676 | static bool check_can_switch(void) |
677 | { | |
678 | struct vga_switcheroo_client *client; | |
679 | ||
680 | list_for_each_entry(client, &vgasr_priv.clients, list) { | |
26ec685f | 681 | if (!client->ops->can_switch(client->pdev)) { |
9b0be1eb | 682 | pr_err("client %x refused switch\n", client->id); |
79721e0a TI |
683 | return false; |
684 | } | |
685 | } | |
686 | return true; | |
687 | } | |
688 | ||
6a9ee8af DA |
689 | static ssize_t |
690 | vga_switcheroo_debugfs_write(struct file *filp, const char __user *ubuf, | |
691 | size_t cnt, loff_t *ppos) | |
692 | { | |
693 | char usercmd[64]; | |
79721e0a | 694 | int ret; |
6a9ee8af | 695 | bool delay = false, can_switch; |
851ab954 | 696 | bool just_mux = false; |
fa3e967f | 697 | enum vga_switcheroo_client_id client_id = VGA_SWITCHEROO_UNKNOWN_ID; |
6a9ee8af DA |
698 | struct vga_switcheroo_client *client = NULL; |
699 | ||
700 | if (cnt > 63) | |
701 | cnt = 63; | |
702 | ||
703 | if (copy_from_user(usercmd, ubuf, cnt)) | |
704 | return -EFAULT; | |
705 | ||
706 | mutex_lock(&vgasr_mutex); | |
707 | ||
8c88e50b JS |
708 | if (!vgasr_priv.active) { |
709 | cnt = -EINVAL; | |
710 | goto out; | |
711 | } | |
6a9ee8af DA |
712 | |
713 | /* pwr off the device not in use */ | |
714 | if (strncmp(usercmd, "OFF", 3) == 0) { | |
79721e0a | 715 | list_for_each_entry(client, &vgasr_priv.clients, list) { |
c91c3fae | 716 | if (client->active || client_is_audio(client)) |
6a9ee8af | 717 | continue; |
0d69704a DA |
718 | if (client->driver_power_control) |
719 | continue; | |
c91c3fae | 720 | set_audio_state(client->id, VGA_SWITCHEROO_OFF); |
79721e0a TI |
721 | if (client->pwr_state == VGA_SWITCHEROO_ON) |
722 | vga_switchoff(client); | |
6a9ee8af DA |
723 | } |
724 | goto out; | |
725 | } | |
726 | /* pwr on the device not in use */ | |
727 | if (strncmp(usercmd, "ON", 2) == 0) { | |
79721e0a | 728 | list_for_each_entry(client, &vgasr_priv.clients, list) { |
c91c3fae | 729 | if (client->active || client_is_audio(client)) |
6a9ee8af | 730 | continue; |
0d69704a DA |
731 | if (client->driver_power_control) |
732 | continue; | |
79721e0a TI |
733 | if (client->pwr_state == VGA_SWITCHEROO_OFF) |
734 | vga_switchon(client); | |
c91c3fae | 735 | set_audio_state(client->id, VGA_SWITCHEROO_ON); |
6a9ee8af DA |
736 | } |
737 | goto out; | |
738 | } | |
739 | ||
740 | /* request a delayed switch - test can we switch now */ | |
741 | if (strncmp(usercmd, "DIGD", 4) == 0) { | |
742 | client_id = VGA_SWITCHEROO_IGD; | |
743 | delay = true; | |
744 | } | |
745 | ||
746 | if (strncmp(usercmd, "DDIS", 4) == 0) { | |
747 | client_id = VGA_SWITCHEROO_DIS; | |
748 | delay = true; | |
749 | } | |
750 | ||
751 | if (strncmp(usercmd, "IGD", 3) == 0) | |
752 | client_id = VGA_SWITCHEROO_IGD; | |
753 | ||
754 | if (strncmp(usercmd, "DIS", 3) == 0) | |
755 | client_id = VGA_SWITCHEROO_DIS; | |
756 | ||
fea6f330 | 757 | if (strncmp(usercmd, "MIGD", 4) == 0) { |
851ab954 DA |
758 | just_mux = true; |
759 | client_id = VGA_SWITCHEROO_IGD; | |
760 | } | |
fea6f330 | 761 | if (strncmp(usercmd, "MDIS", 4) == 0) { |
851ab954 DA |
762 | just_mux = true; |
763 | client_id = VGA_SWITCHEROO_DIS; | |
764 | } | |
765 | ||
21c5ba8c | 766 | if (client_id == VGA_SWITCHEROO_UNKNOWN_ID) |
6a9ee8af | 767 | goto out; |
79721e0a TI |
768 | client = find_client_from_id(&vgasr_priv.clients, client_id); |
769 | if (!client) | |
770 | goto out; | |
6a9ee8af DA |
771 | |
772 | vgasr_priv.delayed_switch_active = false; | |
851ab954 DA |
773 | |
774 | if (just_mux) { | |
e4cb81d7 | 775 | mutex_lock(&vgasr_priv.mux_hw_lock); |
851ab954 | 776 | ret = vgasr_priv.handler->switchto(client_id); |
e4cb81d7 | 777 | mutex_unlock(&vgasr_priv.mux_hw_lock); |
851ab954 DA |
778 | goto out; |
779 | } | |
780 | ||
79721e0a | 781 | if (client->active) |
a67b8887 FM |
782 | goto out; |
783 | ||
6a9ee8af | 784 | /* okay we want a switch - test if devices are willing to switch */ |
79721e0a | 785 | can_switch = check_can_switch(); |
6a9ee8af DA |
786 | |
787 | if (can_switch == false && delay == false) | |
788 | goto out; | |
789 | ||
79721e0a | 790 | if (can_switch) { |
66b37c67 DA |
791 | ret = vga_switchto_stage1(client); |
792 | if (ret) | |
9b0be1eb | 793 | pr_err("switching failed stage 1 %d\n", ret); |
66b37c67 DA |
794 | |
795 | ret = vga_switchto_stage2(client); | |
6a9ee8af | 796 | if (ret) |
9b0be1eb | 797 | pr_err("switching failed stage 2 %d\n", ret); |
66b37c67 | 798 | |
6a9ee8af | 799 | } else { |
9b0be1eb | 800 | pr_info("setting delayed switch to client %d\n", client->id); |
6a9ee8af DA |
801 | vgasr_priv.delayed_switch_active = true; |
802 | vgasr_priv.delayed_client_id = client_id; | |
803 | ||
66b37c67 DA |
804 | ret = vga_switchto_stage1(client); |
805 | if (ret) | |
9b0be1eb | 806 | pr_err("delayed switching stage 1 failed %d\n", ret); |
6a9ee8af DA |
807 | } |
808 | ||
809 | out: | |
810 | mutex_unlock(&vgasr_mutex); | |
811 | return cnt; | |
812 | } | |
813 | ||
814 | static const struct file_operations vga_switcheroo_debugfs_fops = { | |
815 | .owner = THIS_MODULE, | |
816 | .open = vga_switcheroo_debugfs_open, | |
817 | .write = vga_switcheroo_debugfs_write, | |
818 | .read = seq_read, | |
819 | .llseek = seq_lseek, | |
820 | .release = single_release, | |
821 | }; | |
822 | ||
823 | static void vga_switcheroo_debugfs_fini(struct vgasr_priv *priv) | |
824 | { | |
798ae0f6 TR |
825 | debugfs_remove(priv->switch_file); |
826 | priv->switch_file = NULL; | |
827 | ||
828 | debugfs_remove(priv->debugfs_root); | |
829 | priv->debugfs_root = NULL; | |
6a9ee8af DA |
830 | } |
831 | ||
832 | static int vga_switcheroo_debugfs_init(struct vgasr_priv *priv) | |
833 | { | |
9b0be1eb TR |
834 | static const char mp[] = "/sys/kernel/debug"; |
835 | ||
6a9ee8af DA |
836 | /* already initialised */ |
837 | if (priv->debugfs_root) | |
838 | return 0; | |
839 | priv->debugfs_root = debugfs_create_dir("vgaswitcheroo", NULL); | |
840 | ||
841 | if (!priv->debugfs_root) { | |
9b0be1eb | 842 | pr_err("Cannot create %s/vgaswitcheroo\n", mp); |
6a9ee8af DA |
843 | goto fail; |
844 | } | |
845 | ||
846 | priv->switch_file = debugfs_create_file("switch", 0644, | |
7491bfb4 TR |
847 | priv->debugfs_root, NULL, |
848 | &vga_switcheroo_debugfs_fops); | |
6a9ee8af | 849 | if (!priv->switch_file) { |
9b0be1eb | 850 | pr_err("cannot create %s/vgaswitcheroo/switch\n", mp); |
6a9ee8af DA |
851 | goto fail; |
852 | } | |
853 | return 0; | |
854 | fail: | |
855 | vga_switcheroo_debugfs_fini(priv); | |
856 | return -1; | |
857 | } | |
858 | ||
a645654b LW |
859 | /** |
860 | * vga_switcheroo_process_delayed_switch() - helper for delayed switching | |
861 | * | |
862 | * Process a delayed switch if one is pending. DRM drivers should call this | |
863 | * from their ->lastclose callback. | |
864 | * | |
865 | * Return: 0 on success. -EINVAL if no delayed switch is pending, if the client | |
866 | * has unregistered in the meantime or if there are other clients blocking the | |
867 | * switch. If the actual switch fails, an error is reported and 0 is returned. | |
868 | */ | |
6a9ee8af DA |
869 | int vga_switcheroo_process_delayed_switch(void) |
870 | { | |
79721e0a | 871 | struct vga_switcheroo_client *client; |
6a9ee8af DA |
872 | int ret; |
873 | int err = -EINVAL; | |
874 | ||
875 | mutex_lock(&vgasr_mutex); | |
876 | if (!vgasr_priv.delayed_switch_active) | |
877 | goto err; | |
878 | ||
9b0be1eb TR |
879 | pr_info("processing delayed switch to %d\n", |
880 | vgasr_priv.delayed_client_id); | |
6a9ee8af | 881 | |
79721e0a TI |
882 | client = find_client_from_id(&vgasr_priv.clients, |
883 | vgasr_priv.delayed_client_id); | |
884 | if (!client || !check_can_switch()) | |
6a9ee8af DA |
885 | goto err; |
886 | ||
66b37c67 | 887 | ret = vga_switchto_stage2(client); |
6a9ee8af | 888 | if (ret) |
9b0be1eb | 889 | pr_err("delayed switching failed stage 2 %d\n", ret); |
6a9ee8af DA |
890 | |
891 | vgasr_priv.delayed_switch_active = false; | |
892 | err = 0; | |
893 | err: | |
894 | mutex_unlock(&vgasr_mutex); | |
895 | return err; | |
896 | } | |
897 | EXPORT_SYMBOL(vga_switcheroo_process_delayed_switch); | |
0d69704a | 898 | |
a645654b LW |
899 | /** |
900 | * DOC: Driver power control | |
901 | * | |
902 | * In this mode of use, the discrete GPU automatically powers up and down at | |
903 | * the discretion of the driver's runtime pm. On muxed machines, the user may | |
904 | * still influence the muxer state by way of the debugfs interface, however | |
905 | * the ON and OFF commands become a no-op for the discrete GPU. | |
906 | * | |
907 | * This mode is the default on Nvidia HybridPower/Optimus and ATI PowerXpress. | |
908 | * Specifying nouveau.runpm=0, radeon.runpm=0 or amdgpu.runpm=0 on the kernel | |
909 | * command line disables it. | |
910 | * | |
911 | * When the driver decides to power up or down, it notifies vga_switcheroo | |
912 | * thereof so that it can (a) power the audio device on the GPU up or down, | |
913 | * and (b) update its internal power state representation for the device. | |
914 | * This is achieved by vga_switcheroo_set_dynamic_switch(). | |
915 | * | |
916 | * After the GPU has been suspended, the handler needs to be called to cut | |
917 | * power to the GPU. Likewise it needs to reinstate power before the GPU | |
918 | * can resume. This is achieved by vga_switcheroo_init_domain_pm_ops(), | |
919 | * which augments the GPU's suspend/resume functions by the requisite | |
920 | * calls to the handler. | |
921 | * | |
922 | * When the audio device resumes, the GPU needs to be woken. This is achieved | |
923 | * by vga_switcheroo_init_domain_pm_optimus_hdmi_audio(), which augments the | |
924 | * audio device's resume function. | |
925 | * | |
926 | * On muxed machines, if the mux is initially switched to the discrete GPU, | |
927 | * the user ends up with a black screen when the GPU powers down after boot. | |
928 | * As a workaround, the mux is forced to the integrated GPU on runtime suspend, | |
929 | * cf. https://bugs.freedesktop.org/show_bug.cgi?id=75917 | |
930 | */ | |
931 | ||
7491bfb4 TR |
932 | static void vga_switcheroo_power_switch(struct pci_dev *pdev, |
933 | enum vga_switcheroo_state state) | |
0d69704a DA |
934 | { |
935 | struct vga_switcheroo_client *client; | |
936 | ||
937 | if (!vgasr_priv.handler->power_state) | |
938 | return; | |
939 | ||
940 | client = find_client_from_pci(&vgasr_priv.clients, pdev); | |
941 | if (!client) | |
942 | return; | |
943 | ||
944 | if (!client->driver_power_control) | |
945 | return; | |
946 | ||
947 | vgasr_priv.handler->power_state(client->id, state); | |
948 | } | |
949 | ||
a645654b LW |
950 | /** |
951 | * vga_switcheroo_set_dynamic_switch() - helper for driver power control | |
952 | * @pdev: client pci device | |
953 | * @dynamic: new power state | |
954 | * | |
955 | * Helper for GPUs whose power state is controlled by the driver's runtime pm. | |
956 | * When the driver decides to power up or down, it notifies vga_switcheroo | |
957 | * thereof using this helper so that it can (a) power the audio device on | |
958 | * the GPU up or down, and (b) update its internal power state representation | |
959 | * for the device. | |
960 | */ | |
7491bfb4 TR |
961 | void vga_switcheroo_set_dynamic_switch(struct pci_dev *pdev, |
962 | enum vga_switcheroo_state dynamic) | |
0d69704a DA |
963 | { |
964 | struct vga_switcheroo_client *client; | |
965 | ||
8f12a311 | 966 | mutex_lock(&vgasr_mutex); |
0d69704a | 967 | client = find_client_from_pci(&vgasr_priv.clients, pdev); |
8f12a311 LW |
968 | if (!client || !client->driver_power_control) { |
969 | mutex_unlock(&vgasr_mutex); | |
0d69704a | 970 | return; |
8f12a311 | 971 | } |
0d69704a DA |
972 | |
973 | client->pwr_state = dynamic; | |
974 | set_audio_state(client->id, dynamic); | |
8f12a311 | 975 | mutex_unlock(&vgasr_mutex); |
0d69704a DA |
976 | } |
977 | EXPORT_SYMBOL(vga_switcheroo_set_dynamic_switch); | |
978 | ||
979 | /* switcheroo power domain */ | |
980 | static int vga_switcheroo_runtime_suspend(struct device *dev) | |
981 | { | |
982 | struct pci_dev *pdev = to_pci_dev(dev); | |
983 | int ret; | |
984 | ||
985 | ret = dev->bus->pm->runtime_suspend(dev); | |
986 | if (ret) | |
987 | return ret; | |
8f12a311 | 988 | mutex_lock(&vgasr_mutex); |
e4cb81d7 LW |
989 | if (vgasr_priv.handler->switchto) { |
990 | mutex_lock(&vgasr_priv.mux_hw_lock); | |
f2bc5616 | 991 | vgasr_priv.handler->switchto(VGA_SWITCHEROO_IGD); |
e4cb81d7 LW |
992 | mutex_unlock(&vgasr_priv.mux_hw_lock); |
993 | } | |
0d69704a | 994 | vga_switcheroo_power_switch(pdev, VGA_SWITCHEROO_OFF); |
8f12a311 | 995 | mutex_unlock(&vgasr_mutex); |
0d69704a DA |
996 | return 0; |
997 | } | |
998 | ||
999 | static int vga_switcheroo_runtime_resume(struct device *dev) | |
1000 | { | |
1001 | struct pci_dev *pdev = to_pci_dev(dev); | |
1002 | int ret; | |
1003 | ||
8f12a311 | 1004 | mutex_lock(&vgasr_mutex); |
0d69704a | 1005 | vga_switcheroo_power_switch(pdev, VGA_SWITCHEROO_ON); |
8f12a311 | 1006 | mutex_unlock(&vgasr_mutex); |
0d69704a DA |
1007 | ret = dev->bus->pm->runtime_resume(dev); |
1008 | if (ret) | |
1009 | return ret; | |
1010 | ||
1011 | return 0; | |
1012 | } | |
1013 | ||
a645654b LW |
1014 | /** |
1015 | * vga_switcheroo_init_domain_pm_ops() - helper for driver power control | |
1016 | * @dev: vga client device | |
1017 | * @domain: power domain | |
1018 | * | |
1019 | * Helper for GPUs whose power state is controlled by the driver's runtime pm. | |
1020 | * After the GPU has been suspended, the handler needs to be called to cut | |
1021 | * power to the GPU. Likewise it needs to reinstate power before the GPU | |
1022 | * can resume. To this end, this helper augments the suspend/resume functions | |
1023 | * by the requisite calls to the handler. It needs only be called on platforms | |
1024 | * where the power switch is separate to the device being powered down. | |
1025 | */ | |
7491bfb4 TR |
1026 | int vga_switcheroo_init_domain_pm_ops(struct device *dev, |
1027 | struct dev_pm_domain *domain) | |
0d69704a DA |
1028 | { |
1029 | /* copy over all the bus versions */ | |
1030 | if (dev->bus && dev->bus->pm) { | |
1031 | domain->ops = *dev->bus->pm; | |
1032 | domain->ops.runtime_suspend = vga_switcheroo_runtime_suspend; | |
1033 | domain->ops.runtime_resume = vga_switcheroo_runtime_resume; | |
1034 | ||
989561de | 1035 | dev_pm_domain_set(dev, domain); |
0d69704a DA |
1036 | return 0; |
1037 | } | |
989561de | 1038 | dev_pm_domain_set(dev, NULL); |
0d69704a DA |
1039 | return -EINVAL; |
1040 | } | |
1041 | EXPORT_SYMBOL(vga_switcheroo_init_domain_pm_ops); | |
1042 | ||
766a53d0 AD |
1043 | void vga_switcheroo_fini_domain_pm_ops(struct device *dev) |
1044 | { | |
989561de | 1045 | dev_pm_domain_set(dev, NULL); |
766a53d0 AD |
1046 | } |
1047 | EXPORT_SYMBOL(vga_switcheroo_fini_domain_pm_ops); | |
1048 | ||
0d69704a DA |
1049 | static int vga_switcheroo_runtime_resume_hdmi_audio(struct device *dev) |
1050 | { | |
1051 | struct pci_dev *pdev = to_pci_dev(dev); | |
8f12a311 LW |
1052 | struct vga_switcheroo_client *client; |
1053 | struct device *video_dev = NULL; | |
0d69704a | 1054 | int ret; |
0d69704a DA |
1055 | |
1056 | /* we need to check if we have to switch back on the video | |
1057 | device so the audio device can come back */ | |
8f12a311 | 1058 | mutex_lock(&vgasr_mutex); |
0d69704a | 1059 | list_for_each_entry(client, &vgasr_priv.clients, list) { |
7491bfb4 TR |
1060 | if (PCI_SLOT(client->pdev->devfn) == PCI_SLOT(pdev->devfn) && |
1061 | client_is_vga(client)) { | |
8f12a311 | 1062 | video_dev = &client->pdev->dev; |
0d69704a DA |
1063 | break; |
1064 | } | |
1065 | } | |
8f12a311 LW |
1066 | mutex_unlock(&vgasr_mutex); |
1067 | ||
1068 | if (video_dev) { | |
1069 | ret = pm_runtime_get_sync(video_dev); | |
1070 | if (ret && ret != 1) | |
1071 | return ret; | |
1072 | } | |
0d69704a DA |
1073 | ret = dev->bus->pm->runtime_resume(dev); |
1074 | ||
1075 | /* put the reference for the gpu */ | |
8f12a311 LW |
1076 | if (video_dev) { |
1077 | pm_runtime_mark_last_busy(video_dev); | |
1078 | pm_runtime_put_autosuspend(video_dev); | |
0d69704a DA |
1079 | } |
1080 | return ret; | |
1081 | } | |
1082 | ||
a645654b LW |
1083 | /** |
1084 | * vga_switcheroo_init_domain_pm_optimus_hdmi_audio() - helper for driver | |
1085 | * power control | |
1086 | * @dev: audio client device | |
1087 | * @domain: power domain | |
1088 | * | |
1089 | * Helper for GPUs whose power state is controlled by the driver's runtime pm. | |
1090 | * When the audio device resumes, the GPU needs to be woken. This helper | |
1091 | * augments the audio device's resume function to do that. | |
1092 | * | |
1093 | * Return: 0 on success, -EINVAL if no power management operations are | |
1094 | * defined for this device. | |
1095 | */ | |
7491bfb4 TR |
1096 | int |
1097 | vga_switcheroo_init_domain_pm_optimus_hdmi_audio(struct device *dev, | |
1098 | struct dev_pm_domain *domain) | |
0d69704a DA |
1099 | { |
1100 | /* copy over all the bus versions */ | |
1101 | if (dev->bus && dev->bus->pm) { | |
1102 | domain->ops = *dev->bus->pm; | |
7491bfb4 TR |
1103 | domain->ops.runtime_resume = |
1104 | vga_switcheroo_runtime_resume_hdmi_audio; | |
0d69704a | 1105 | |
989561de | 1106 | dev_pm_domain_set(dev, domain); |
0d69704a DA |
1107 | return 0; |
1108 | } | |
989561de | 1109 | dev_pm_domain_set(dev, NULL); |
0d69704a DA |
1110 | return -EINVAL; |
1111 | } | |
1112 | EXPORT_SYMBOL(vga_switcheroo_init_domain_pm_optimus_hdmi_audio); |