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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 | ||
b00e5334 | 33 | #include <linux/apple-gmux.h> |
4127838c | 34 | #include <linux/console.h> |
6a9ee8af DA |
35 | #include <linux/debugfs.h> |
36 | #include <linux/fb.h> | |
4127838c LW |
37 | #include <linux/fs.h> |
38 | #include <linux/module.h> | |
6a9ee8af | 39 | #include <linux/pci.h> |
989561de | 40 | #include <linux/pm_domain.h> |
0d69704a | 41 | #include <linux/pm_runtime.h> |
4127838c LW |
42 | #include <linux/seq_file.h> |
43 | #include <linux/uaccess.h> | |
2fbe8c7c | 44 | #include <linux/vgaarb.h> |
4127838c | 45 | #include <linux/vga_switcheroo.h> |
2fbe8c7c | 46 | |
a645654b LW |
47 | /** |
48 | * DOC: Overview | |
49 | * | |
50 | * vga_switcheroo is the Linux subsystem for laptop hybrid graphics. | |
51 | * These come in two flavors: | |
52 | * | |
53 | * * muxed: Dual GPUs with a multiplexer chip to switch outputs between GPUs. | |
54 | * * muxless: Dual GPUs but only one of them is connected to outputs. | |
fb001dfd LW |
55 | * The other one is merely used to offload rendering, its results |
56 | * are copied over PCIe into the framebuffer. On Linux this is | |
57 | * supported with DRI PRIME. | |
a645654b LW |
58 | * |
59 | * Hybrid graphics started to appear in the late Naughties and were initially | |
60 | * all muxed. Newer laptops moved to a muxless architecture for cost reasons. | |
61 | * A notable exception is the MacBook Pro which continues to use a mux. | |
62 | * Muxes come with varying capabilities: Some switch only the panel, others | |
63 | * can also switch external displays. Some switch all display pins at once | |
64 | * while others can switch just the DDC lines. (To allow EDID probing | |
65 | * for the inactive GPU.) Also, muxes are often used to cut power to the | |
66 | * discrete GPU while it is not used. | |
67 | * | |
3a848662 | 68 | * DRM drivers register GPUs with vga_switcheroo, these are henceforth called |
a645654b LW |
69 | * clients. The mux is called the handler. Muxless machines also register a |
70 | * handler to control the power state of the discrete GPU, its ->switchto | |
71 | * callback is a no-op for obvious reasons. The discrete GPU is often equipped | |
72 | * with an HDA controller for the HDMI/DP audio signal, this will also | |
73 | * register as a client so that vga_switcheroo can take care of the correct | |
74 | * suspend/resume order when changing the discrete GPU's power state. In total | |
75 | * there can thus be up to three clients: Two vga clients (GPUs) and one audio | |
76 | * client (on the discrete GPU). The code is mostly prepared to support | |
77 | * machines with more than two GPUs should they become available. | |
e4cb81d7 | 78 | * |
a645654b LW |
79 | * The GPU to which the outputs are currently switched is called the |
80 | * active client in vga_switcheroo parlance. The GPU not in use is the | |
e4cb81d7 LW |
81 | * inactive client. When the inactive client's DRM driver is loaded, |
82 | * it will be unable to probe the panel's EDID and hence depends on | |
83 | * VBIOS to provide its display modes. If the VBIOS modes are bogus or | |
84 | * if there is no VBIOS at all (which is common on the MacBook Pro), | |
85 | * a client may alternatively request that the DDC lines are temporarily | |
86 | * switched to it, provided that the handler supports this. Switching | |
87 | * only the DDC lines and not the entire output avoids unnecessary | |
88 | * flickering. | |
a645654b LW |
89 | */ |
90 | ||
91 | /** | |
92 | * struct vga_switcheroo_client - registered client | |
93 | * @pdev: client pci device | |
94 | * @fb_info: framebuffer to which console is remapped on switching | |
95 | * @pwr_state: current power state | |
96 | * @ops: client callbacks | |
21c5ba8c LW |
97 | * @id: client identifier. Determining the id requires the handler, |
98 | * so gpus are initially assigned VGA_SWITCHEROO_UNKNOWN_ID | |
99 | * and later given their true id in vga_switcheroo_enable() | |
a645654b LW |
100 | * @active: whether the outputs are currently switched to this client |
101 | * @driver_power_control: whether power state is controlled by the driver's | |
102 | * runtime pm. If true, writing ON and OFF to the vga_switcheroo debugfs | |
103 | * interface is a no-op so as not to interfere with runtime pm | |
104 | * @list: client list | |
105 | * | |
106 | * Registered client. A client can be either a GPU or an audio device on a GPU. | |
107 | * For audio clients, the @fb_info, @active and @driver_power_control members | |
108 | * are bogus. | |
109 | */ | |
6a9ee8af DA |
110 | struct vga_switcheroo_client { |
111 | struct pci_dev *pdev; | |
112 | struct fb_info *fb_info; | |
203d027d | 113 | enum vga_switcheroo_state pwr_state; |
26ec685f | 114 | const struct vga_switcheroo_client_ops *ops; |
fa3e967f | 115 | enum vga_switcheroo_client_id id; |
6a9ee8af | 116 | bool active; |
0d69704a | 117 | bool driver_power_control; |
79721e0a | 118 | struct list_head list; |
6a9ee8af DA |
119 | }; |
120 | ||
a645654b LW |
121 | /* |
122 | * protects access to struct vgasr_priv | |
123 | */ | |
6a9ee8af DA |
124 | static DEFINE_MUTEX(vgasr_mutex); |
125 | ||
a645654b LW |
126 | /** |
127 | * struct vgasr_priv - vga_switcheroo private data | |
128 | * @active: whether vga_switcheroo is enabled. | |
129 | * Prerequisite is the registration of two GPUs and a handler | |
130 | * @delayed_switch_active: whether a delayed switch is pending | |
131 | * @delayed_client_id: client to which a delayed switch is pending | |
132 | * @debugfs_root: directory for vga_switcheroo debugfs interface | |
133 | * @switch_file: file for vga_switcheroo debugfs interface | |
134 | * @registered_clients: number of registered GPUs | |
135 | * (counting only vga clients, not audio clients) | |
136 | * @clients: list of registered clients | |
137 | * @handler: registered handler | |
156d7d41 | 138 | * @handler_flags: flags of registered handler |
e4cb81d7 LW |
139 | * @mux_hw_lock: protects mux state |
140 | * (in particular while DDC lines are temporarily switched) | |
141 | * @old_ddc_owner: client to which DDC lines will be switched back on unlock | |
a645654b LW |
142 | * |
143 | * vga_switcheroo private data. Currently only one vga_switcheroo instance | |
144 | * per system is supported. | |
145 | */ | |
6a9ee8af | 146 | struct vgasr_priv { |
6a9ee8af DA |
147 | bool active; |
148 | bool delayed_switch_active; | |
149 | enum vga_switcheroo_client_id delayed_client_id; | |
150 | ||
151 | struct dentry *debugfs_root; | |
152 | struct dentry *switch_file; | |
153 | ||
154 | int registered_clients; | |
79721e0a | 155 | struct list_head clients; |
6a9ee8af | 156 | |
5d170139 | 157 | const struct vga_switcheroo_handler *handler; |
156d7d41 | 158 | enum vga_switcheroo_handler_flags_t handler_flags; |
e4cb81d7 LW |
159 | struct mutex mux_hw_lock; |
160 | int old_ddc_owner; | |
6a9ee8af DA |
161 | }; |
162 | ||
3e9e63db TI |
163 | #define ID_BIT_AUDIO 0x100 |
164 | #define client_is_audio(c) ((c)->id & ID_BIT_AUDIO) | |
21c5ba8c LW |
165 | #define client_is_vga(c) ((c)->id == VGA_SWITCHEROO_UNKNOWN_ID || \ |
166 | !client_is_audio(c)) | |
3e9e63db TI |
167 | #define client_id(c) ((c)->id & ~ID_BIT_AUDIO) |
168 | ||
6a9ee8af DA |
169 | static int vga_switcheroo_debugfs_init(struct vgasr_priv *priv); |
170 | static void vga_switcheroo_debugfs_fini(struct vgasr_priv *priv); | |
171 | ||
172 | /* only one switcheroo per system */ | |
79721e0a TI |
173 | static struct vgasr_priv vgasr_priv = { |
174 | .clients = LIST_HEAD_INIT(vgasr_priv.clients), | |
e4cb81d7 | 175 | .mux_hw_lock = __MUTEX_INITIALIZER(vgasr_priv.mux_hw_lock), |
79721e0a | 176 | }; |
6a9ee8af | 177 | |
36704c0c | 178 | static bool vga_switcheroo_ready(void) |
6a9ee8af | 179 | { |
36704c0c SF |
180 | /* we're ready if we get two clients + handler */ |
181 | return !vgasr_priv.active && | |
182 | vgasr_priv.registered_clients == 2 && vgasr_priv.handler; | |
6a9ee8af | 183 | } |
6a9ee8af DA |
184 | |
185 | static void vga_switcheroo_enable(void) | |
186 | { | |
6a9ee8af | 187 | int ret; |
79721e0a TI |
188 | struct vga_switcheroo_client *client; |
189 | ||
6a9ee8af | 190 | /* call the handler to init */ |
e99eac5e SF |
191 | if (vgasr_priv.handler->init) |
192 | vgasr_priv.handler->init(); | |
6a9ee8af | 193 | |
79721e0a | 194 | list_for_each_entry(client, &vgasr_priv.clients, list) { |
21c5ba8c | 195 | if (client->id != VGA_SWITCHEROO_UNKNOWN_ID) |
3e9e63db | 196 | continue; |
79721e0a | 197 | ret = vgasr_priv.handler->get_client_id(client->pdev); |
6a9ee8af DA |
198 | if (ret < 0) |
199 | return; | |
200 | ||
79721e0a | 201 | client->id = ret; |
6a9ee8af DA |
202 | } |
203 | vga_switcheroo_debugfs_init(&vgasr_priv); | |
204 | vgasr_priv.active = true; | |
205 | } | |
206 | ||
a645654b LW |
207 | /** |
208 | * vga_switcheroo_register_handler() - register handler | |
209 | * @handler: handler callbacks | |
156d7d41 | 210 | * @handler_flags: handler flags |
a645654b LW |
211 | * |
212 | * Register handler. Enable vga_switcheroo if two vga clients have already | |
213 | * registered. | |
214 | * | |
215 | * Return: 0 on success, -EINVAL if a handler was already registered. | |
216 | */ | |
156d7d41 LW |
217 | int vga_switcheroo_register_handler(const struct vga_switcheroo_handler *handler, |
218 | enum vga_switcheroo_handler_flags_t handler_flags) | |
36704c0c SF |
219 | { |
220 | mutex_lock(&vgasr_mutex); | |
221 | if (vgasr_priv.handler) { | |
222 | mutex_unlock(&vgasr_mutex); | |
223 | return -EINVAL; | |
224 | } | |
225 | ||
226 | vgasr_priv.handler = handler; | |
156d7d41 | 227 | vgasr_priv.handler_flags = handler_flags; |
36704c0c | 228 | if (vga_switcheroo_ready()) { |
9b0be1eb | 229 | pr_info("enabled\n"); |
36704c0c SF |
230 | vga_switcheroo_enable(); |
231 | } | |
232 | mutex_unlock(&vgasr_mutex); | |
233 | return 0; | |
234 | } | |
235 | EXPORT_SYMBOL(vga_switcheroo_register_handler); | |
236 | ||
a645654b LW |
237 | /** |
238 | * vga_switcheroo_unregister_handler() - unregister handler | |
239 | * | |
240 | * Unregister handler. Disable vga_switcheroo. | |
241 | */ | |
36704c0c SF |
242 | void vga_switcheroo_unregister_handler(void) |
243 | { | |
244 | mutex_lock(&vgasr_mutex); | |
e4cb81d7 | 245 | mutex_lock(&vgasr_priv.mux_hw_lock); |
156d7d41 | 246 | vgasr_priv.handler_flags = 0; |
36704c0c SF |
247 | vgasr_priv.handler = NULL; |
248 | if (vgasr_priv.active) { | |
9b0be1eb | 249 | pr_info("disabled\n"); |
36704c0c SF |
250 | vga_switcheroo_debugfs_fini(&vgasr_priv); |
251 | vgasr_priv.active = false; | |
252 | } | |
e4cb81d7 | 253 | mutex_unlock(&vgasr_priv.mux_hw_lock); |
36704c0c SF |
254 | mutex_unlock(&vgasr_mutex); |
255 | } | |
256 | EXPORT_SYMBOL(vga_switcheroo_unregister_handler); | |
257 | ||
156d7d41 LW |
258 | /** |
259 | * vga_switcheroo_handler_flags() - obtain handler flags | |
260 | * | |
261 | * Helper for clients to obtain the handler flags bitmask. | |
262 | * | |
263 | * Return: Handler flags. A value of 0 means that no handler is registered | |
264 | * or that the handler has no special capabilities. | |
265 | */ | |
266 | enum vga_switcheroo_handler_flags_t vga_switcheroo_handler_flags(void) | |
267 | { | |
268 | return vgasr_priv.handler_flags; | |
269 | } | |
270 | EXPORT_SYMBOL(vga_switcheroo_handler_flags); | |
271 | ||
3e9e63db TI |
272 | static int register_client(struct pci_dev *pdev, |
273 | const struct vga_switcheroo_client_ops *ops, | |
fa3e967f LW |
274 | enum vga_switcheroo_client_id id, bool active, |
275 | bool driver_power_control) | |
6a9ee8af | 276 | { |
79721e0a | 277 | struct vga_switcheroo_client *client; |
6a9ee8af | 278 | |
79721e0a TI |
279 | client = kzalloc(sizeof(*client), GFP_KERNEL); |
280 | if (!client) | |
281 | return -ENOMEM; | |
282 | ||
283 | client->pwr_state = VGA_SWITCHEROO_ON; | |
284 | client->pdev = pdev; | |
26ec685f | 285 | client->ops = ops; |
3e9e63db TI |
286 | client->id = id; |
287 | client->active = active; | |
0d69704a | 288 | client->driver_power_control = driver_power_control; |
6a9ee8af | 289 | |
79721e0a TI |
290 | mutex_lock(&vgasr_mutex); |
291 | list_add_tail(&client->list, &vgasr_priv.clients); | |
3e9e63db TI |
292 | if (client_is_vga(client)) |
293 | vgasr_priv.registered_clients++; | |
6a9ee8af | 294 | |
36704c0c | 295 | if (vga_switcheroo_ready()) { |
9b0be1eb | 296 | pr_info("enabled\n"); |
6a9ee8af DA |
297 | vga_switcheroo_enable(); |
298 | } | |
299 | mutex_unlock(&vgasr_mutex); | |
300 | return 0; | |
301 | } | |
3e9e63db | 302 | |
a645654b LW |
303 | /** |
304 | * vga_switcheroo_register_client - register vga client | |
305 | * @pdev: client pci device | |
306 | * @ops: client callbacks | |
307 | * @driver_power_control: whether power state is controlled by the driver's | |
308 | * runtime pm | |
309 | * | |
310 | * Register vga client (GPU). Enable vga_switcheroo if another GPU and a | |
311 | * handler have already registered. The power state of the client is assumed | |
b00e5334 LW |
312 | * to be ON. Beforehand, vga_switcheroo_client_probe_defer() shall be called |
313 | * to ensure that all prerequisites are met. | |
a645654b LW |
314 | * |
315 | * Return: 0 on success, -ENOMEM on memory allocation error. | |
316 | */ | |
3e9e63db | 317 | int vga_switcheroo_register_client(struct pci_dev *pdev, |
0d69704a DA |
318 | const struct vga_switcheroo_client_ops *ops, |
319 | bool driver_power_control) | |
3e9e63db | 320 | { |
21c5ba8c | 321 | return register_client(pdev, ops, VGA_SWITCHEROO_UNKNOWN_ID, |
7491bfb4 TR |
322 | pdev == vga_default_device(), |
323 | driver_power_control); | |
3e9e63db | 324 | } |
6a9ee8af DA |
325 | EXPORT_SYMBOL(vga_switcheroo_register_client); |
326 | ||
a645654b LW |
327 | /** |
328 | * vga_switcheroo_register_audio_client - register audio client | |
329 | * @pdev: client pci device | |
330 | * @ops: client callbacks | |
fa3e967f | 331 | * @id: client identifier |
a645654b LW |
332 | * |
333 | * Register audio client (audio device on a GPU). The power state of the | |
a345918d LW |
334 | * client is assumed to be ON. Beforehand, vga_switcheroo_client_probe_defer() |
335 | * shall be called to ensure that all prerequisites are met. | |
a645654b LW |
336 | * |
337 | * Return: 0 on success, -ENOMEM on memory allocation error. | |
338 | */ | |
3e9e63db TI |
339 | int vga_switcheroo_register_audio_client(struct pci_dev *pdev, |
340 | const struct vga_switcheroo_client_ops *ops, | |
fa3e967f | 341 | enum vga_switcheroo_client_id id) |
3e9e63db | 342 | { |
21b45676 | 343 | return register_client(pdev, ops, id | ID_BIT_AUDIO, false, false); |
3e9e63db TI |
344 | } |
345 | EXPORT_SYMBOL(vga_switcheroo_register_audio_client); | |
346 | ||
79721e0a TI |
347 | static struct vga_switcheroo_client * |
348 | find_client_from_pci(struct list_head *head, struct pci_dev *pdev) | |
349 | { | |
350 | struct vga_switcheroo_client *client; | |
7491bfb4 | 351 | |
79721e0a TI |
352 | list_for_each_entry(client, head, list) |
353 | if (client->pdev == pdev) | |
354 | return client; | |
355 | return NULL; | |
356 | } | |
357 | ||
358 | static struct vga_switcheroo_client * | |
fa3e967f LW |
359 | find_client_from_id(struct list_head *head, |
360 | enum vga_switcheroo_client_id client_id) | |
79721e0a TI |
361 | { |
362 | struct vga_switcheroo_client *client; | |
7491bfb4 | 363 | |
79721e0a TI |
364 | list_for_each_entry(client, head, list) |
365 | if (client->id == client_id) | |
366 | return client; | |
367 | return NULL; | |
368 | } | |
369 | ||
370 | static struct vga_switcheroo_client * | |
371 | find_active_client(struct list_head *head) | |
372 | { | |
373 | struct vga_switcheroo_client *client; | |
7491bfb4 | 374 | |
79721e0a | 375 | list_for_each_entry(client, head, list) |
21b45676 | 376 | if (client->active) |
79721e0a TI |
377 | return client; |
378 | return NULL; | |
379 | } | |
380 | ||
b00e5334 LW |
381 | /** |
382 | * vga_switcheroo_client_probe_defer() - whether to defer probing a given client | |
383 | * @pdev: client pci device | |
384 | * | |
385 | * Determine whether any prerequisites are not fulfilled to probe a given | |
386 | * client. Drivers shall invoke this early on in their ->probe callback | |
387 | * and return %-EPROBE_DEFER if it evaluates to %true. Thou shalt not | |
388 | * register the client ere thou hast called this. | |
389 | * | |
390 | * Return: %true if probing should be deferred, otherwise %false. | |
391 | */ | |
392 | bool vga_switcheroo_client_probe_defer(struct pci_dev *pdev) | |
393 | { | |
a345918d LW |
394 | if ((pdev->class >> 16) == PCI_BASE_CLASS_DISPLAY) { |
395 | /* | |
396 | * apple-gmux is needed on pre-retina MacBook Pro | |
397 | * to probe the panel if pdev is the inactive GPU. | |
398 | */ | |
399 | if (apple_gmux_present() && pdev != vga_default_device() && | |
400 | !vgasr_priv.handler_flags) | |
401 | return true; | |
402 | } | |
b00e5334 LW |
403 | |
404 | return false; | |
405 | } | |
406 | EXPORT_SYMBOL(vga_switcheroo_client_probe_defer); | |
407 | ||
a645654b LW |
408 | /** |
409 | * vga_switcheroo_get_client_state() - obtain power state of a given client | |
410 | * @pdev: client pci device | |
411 | * | |
412 | * Obtain power state of a given client as seen from vga_switcheroo. | |
413 | * The function is only called from hda_intel.c. | |
414 | * | |
415 | * Return: Power state. | |
416 | */ | |
203d027d | 417 | enum vga_switcheroo_state vga_switcheroo_get_client_state(struct pci_dev *pdev) |
c8e9cf7b TI |
418 | { |
419 | struct vga_switcheroo_client *client; | |
8f12a311 | 420 | enum vga_switcheroo_state ret; |
c8e9cf7b | 421 | |
8f12a311 | 422 | mutex_lock(&vgasr_mutex); |
c8e9cf7b TI |
423 | client = find_client_from_pci(&vgasr_priv.clients, pdev); |
424 | if (!client) | |
8f12a311 | 425 | ret = VGA_SWITCHEROO_NOT_FOUND; |
8f12a311 LW |
426 | else |
427 | ret = client->pwr_state; | |
428 | mutex_unlock(&vgasr_mutex); | |
429 | return ret; | |
c8e9cf7b TI |
430 | } |
431 | EXPORT_SYMBOL(vga_switcheroo_get_client_state); | |
432 | ||
a645654b LW |
433 | /** |
434 | * vga_switcheroo_unregister_client() - unregister client | |
435 | * @pdev: client pci device | |
436 | * | |
437 | * Unregister client. Disable vga_switcheroo if this is a vga client (GPU). | |
438 | */ | |
6a9ee8af DA |
439 | void vga_switcheroo_unregister_client(struct pci_dev *pdev) |
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) { | |
3e9e63db TI |
446 | if (client_is_vga(client)) |
447 | vgasr_priv.registered_clients--; | |
79721e0a TI |
448 | list_del(&client->list); |
449 | kfree(client); | |
6a9ee8af | 450 | } |
3e9e63db | 451 | if (vgasr_priv.active && vgasr_priv.registered_clients < 2) { |
9b0be1eb | 452 | pr_info("disabled\n"); |
3e9e63db TI |
453 | vga_switcheroo_debugfs_fini(&vgasr_priv); |
454 | vgasr_priv.active = false; | |
455 | } | |
6a9ee8af DA |
456 | mutex_unlock(&vgasr_mutex); |
457 | } | |
458 | EXPORT_SYMBOL(vga_switcheroo_unregister_client); | |
459 | ||
a645654b LW |
460 | /** |
461 | * vga_switcheroo_client_fb_set() - set framebuffer of a given client | |
462 | * @pdev: client pci device | |
463 | * @info: framebuffer | |
464 | * | |
465 | * Set framebuffer of a given client. The console will be remapped to this | |
466 | * on switching. | |
467 | */ | |
6a9ee8af DA |
468 | void vga_switcheroo_client_fb_set(struct pci_dev *pdev, |
469 | struct fb_info *info) | |
470 | { | |
79721e0a | 471 | struct vga_switcheroo_client *client; |
6a9ee8af DA |
472 | |
473 | mutex_lock(&vgasr_mutex); | |
79721e0a TI |
474 | client = find_client_from_pci(&vgasr_priv.clients, pdev); |
475 | if (client) | |
476 | client->fb_info = info; | |
6a9ee8af DA |
477 | mutex_unlock(&vgasr_mutex); |
478 | } | |
479 | EXPORT_SYMBOL(vga_switcheroo_client_fb_set); | |
480 | ||
e4cb81d7 LW |
481 | /** |
482 | * vga_switcheroo_lock_ddc() - temporarily switch DDC lines to a given client | |
483 | * @pdev: client pci device | |
484 | * | |
485 | * Temporarily switch DDC lines to the client identified by @pdev | |
486 | * (but leave the outputs otherwise switched to where they are). | |
487 | * This allows the inactive client to probe EDID. The DDC lines must | |
488 | * afterwards be switched back by calling vga_switcheroo_unlock_ddc(), | |
489 | * even if this function returns an error. | |
490 | * | |
491 | * Return: Previous DDC owner on success or a negative int on error. | |
492 | * Specifically, %-ENODEV if no handler has registered or if the handler | |
493 | * does not support switching the DDC lines. Also, a negative value | |
494 | * returned by the handler is propagated back to the caller. | |
495 | * The return value has merely an informational purpose for any caller | |
496 | * which might be interested in it. It is acceptable to ignore the return | |
497 | * value and simply rely on the result of the subsequent EDID probe, | |
498 | * which will be %NULL if DDC switching failed. | |
499 | */ | |
500 | int vga_switcheroo_lock_ddc(struct pci_dev *pdev) | |
501 | { | |
502 | enum vga_switcheroo_client_id id; | |
503 | ||
504 | mutex_lock(&vgasr_priv.mux_hw_lock); | |
505 | if (!vgasr_priv.handler || !vgasr_priv.handler->switch_ddc) { | |
506 | vgasr_priv.old_ddc_owner = -ENODEV; | |
507 | return -ENODEV; | |
508 | } | |
509 | ||
510 | id = vgasr_priv.handler->get_client_id(pdev); | |
511 | vgasr_priv.old_ddc_owner = vgasr_priv.handler->switch_ddc(id); | |
512 | return vgasr_priv.old_ddc_owner; | |
513 | } | |
514 | EXPORT_SYMBOL(vga_switcheroo_lock_ddc); | |
515 | ||
516 | /** | |
517 | * vga_switcheroo_unlock_ddc() - switch DDC lines back to previous owner | |
518 | * @pdev: client pci device | |
519 | * | |
520 | * Switch DDC lines back to the previous owner after calling | |
521 | * vga_switcheroo_lock_ddc(). This must be called even if | |
522 | * vga_switcheroo_lock_ddc() returned an error. | |
523 | * | |
524 | * Return: Previous DDC owner on success (i.e. the client identifier of @pdev) | |
525 | * or a negative int on error. | |
526 | * Specifically, %-ENODEV if no handler has registered or if the handler | |
527 | * does not support switching the DDC lines. Also, a negative value | |
528 | * returned by the handler is propagated back to the caller. | |
529 | * Finally, invoking this function without calling vga_switcheroo_lock_ddc() | |
530 | * first is not allowed and will result in %-EINVAL. | |
531 | */ | |
532 | int vga_switcheroo_unlock_ddc(struct pci_dev *pdev) | |
533 | { | |
534 | enum vga_switcheroo_client_id id; | |
535 | int ret = vgasr_priv.old_ddc_owner; | |
536 | ||
537 | if (WARN_ON_ONCE(!mutex_is_locked(&vgasr_priv.mux_hw_lock))) | |
538 | return -EINVAL; | |
539 | ||
540 | if (vgasr_priv.old_ddc_owner >= 0) { | |
541 | id = vgasr_priv.handler->get_client_id(pdev); | |
542 | if (vgasr_priv.old_ddc_owner != id) | |
543 | ret = vgasr_priv.handler->switch_ddc( | |
544 | vgasr_priv.old_ddc_owner); | |
545 | } | |
546 | mutex_unlock(&vgasr_priv.mux_hw_lock); | |
547 | return ret; | |
548 | } | |
549 | EXPORT_SYMBOL(vga_switcheroo_unlock_ddc); | |
550 | ||
a645654b LW |
551 | /** |
552 | * DOC: Manual switching and manual power control | |
553 | * | |
554 | * In this mode of use, the file /sys/kernel/debug/vgaswitcheroo/switch | |
555 | * can be read to retrieve the current vga_switcheroo state and commands | |
556 | * can be written to it to change the state. The file appears as soon as | |
557 | * two GPU drivers and one handler have registered with vga_switcheroo. | |
558 | * The following commands are understood: | |
559 | * | |
560 | * * OFF: Power off the device not in use. | |
561 | * * ON: Power on the device not in use. | |
562 | * * IGD: Switch to the integrated graphics device. | |
fb001dfd LW |
563 | * Power on the integrated GPU if necessary, power off the discrete GPU. |
564 | * Prerequisite is that no user space processes (e.g. Xorg, alsactl) | |
565 | * have opened device files of the GPUs or the audio client. If the | |
566 | * switch fails, the user may invoke lsof(8) or fuser(1) on /dev/dri/ | |
567 | * and /dev/snd/controlC1 to identify processes blocking the switch. | |
a645654b LW |
568 | * * DIS: Switch to the discrete graphics device. |
569 | * * DIGD: Delayed switch to the integrated graphics device. | |
fb001dfd LW |
570 | * This will perform the switch once the last user space process has |
571 | * closed the device files of the GPUs and the audio client. | |
a645654b LW |
572 | * * DDIS: Delayed switch to the discrete graphics device. |
573 | * * MIGD: Mux-only switch to the integrated graphics device. | |
fb001dfd LW |
574 | * Does not remap console or change the power state of either gpu. |
575 | * If the integrated GPU is currently off, the screen will turn black. | |
576 | * If it is on, the screen will show whatever happens to be in VRAM. | |
577 | * Either way, the user has to blindly enter the command to switch back. | |
a645654b LW |
578 | * * MDIS: Mux-only switch to the discrete graphics device. |
579 | * | |
580 | * For GPUs whose power state is controlled by the driver's runtime pm, | |
581 | * the ON and OFF commands are a no-op (see next section). | |
582 | * | |
583 | * For muxless machines, the IGD/DIS, DIGD/DDIS and MIGD/MDIS commands | |
584 | * should not be used. | |
585 | */ | |
586 | ||
6a9ee8af DA |
587 | static int vga_switcheroo_show(struct seq_file *m, void *v) |
588 | { | |
79721e0a TI |
589 | struct vga_switcheroo_client *client; |
590 | int i = 0; | |
7491bfb4 | 591 | |
6a9ee8af | 592 | mutex_lock(&vgasr_mutex); |
79721e0a | 593 | list_for_each_entry(client, &vgasr_priv.clients, list) { |
0d69704a | 594 | seq_printf(m, "%d:%s%s:%c:%s%s:%s\n", i, |
7491bfb4 TR |
595 | client_id(client) == VGA_SWITCHEROO_DIS ? "DIS" : |
596 | "IGD", | |
3e9e63db | 597 | client_is_vga(client) ? "" : "-Audio", |
79721e0a | 598 | client->active ? '+' : ' ', |
0d69704a | 599 | client->driver_power_control ? "Dyn" : "", |
79721e0a TI |
600 | client->pwr_state ? "Pwr" : "Off", |
601 | pci_name(client->pdev)); | |
602 | i++; | |
6a9ee8af DA |
603 | } |
604 | mutex_unlock(&vgasr_mutex); | |
605 | return 0; | |
606 | } | |
607 | ||
608 | static int vga_switcheroo_debugfs_open(struct inode *inode, struct file *file) | |
609 | { | |
610 | return single_open(file, vga_switcheroo_show, NULL); | |
611 | } | |
612 | ||
613 | static int vga_switchon(struct vga_switcheroo_client *client) | |
614 | { | |
0d69704a DA |
615 | if (client->driver_power_control) |
616 | return 0; | |
5cfb3c3a DA |
617 | if (vgasr_priv.handler->power_state) |
618 | vgasr_priv.handler->power_state(client->id, VGA_SWITCHEROO_ON); | |
6a9ee8af | 619 | /* call the driver callback to turn on device */ |
26ec685f | 620 | client->ops->set_gpu_state(client->pdev, VGA_SWITCHEROO_ON); |
6a9ee8af DA |
621 | client->pwr_state = VGA_SWITCHEROO_ON; |
622 | return 0; | |
623 | } | |
624 | ||
625 | static int vga_switchoff(struct vga_switcheroo_client *client) | |
626 | { | |
0d69704a DA |
627 | if (client->driver_power_control) |
628 | return 0; | |
6a9ee8af | 629 | /* call the driver callback to turn off device */ |
26ec685f | 630 | client->ops->set_gpu_state(client->pdev, VGA_SWITCHEROO_OFF); |
5cfb3c3a DA |
631 | if (vgasr_priv.handler->power_state) |
632 | vgasr_priv.handler->power_state(client->id, VGA_SWITCHEROO_OFF); | |
6a9ee8af DA |
633 | client->pwr_state = VGA_SWITCHEROO_OFF; |
634 | return 0; | |
635 | } | |
636 | ||
fa3e967f LW |
637 | static void set_audio_state(enum vga_switcheroo_client_id id, |
638 | enum vga_switcheroo_state state) | |
3e9e63db TI |
639 | { |
640 | struct vga_switcheroo_client *client; | |
641 | ||
642 | client = find_client_from_id(&vgasr_priv.clients, id | ID_BIT_AUDIO); | |
643 | if (client && client->pwr_state != state) { | |
644 | client->ops->set_gpu_state(client->pdev, state); | |
645 | client->pwr_state = state; | |
646 | } | |
647 | } | |
648 | ||
66b37c67 DA |
649 | /* stage one happens before delay */ |
650 | static int vga_switchto_stage1(struct vga_switcheroo_client *new_client) | |
6a9ee8af | 651 | { |
79721e0a | 652 | struct vga_switcheroo_client *active; |
6a9ee8af | 653 | |
79721e0a | 654 | active = find_active_client(&vgasr_priv.clients); |
6a9ee8af DA |
655 | if (!active) |
656 | return 0; | |
657 | ||
6a9ee8af DA |
658 | if (new_client->pwr_state == VGA_SWITCHEROO_OFF) |
659 | vga_switchon(new_client); | |
660 | ||
2fbe8c7c | 661 | vga_set_default_device(new_client->pdev); |
66b37c67 DA |
662 | return 0; |
663 | } | |
664 | ||
665 | /* post delay */ | |
666 | static int vga_switchto_stage2(struct vga_switcheroo_client *new_client) | |
667 | { | |
668 | int ret; | |
79721e0a | 669 | struct vga_switcheroo_client *active; |
66b37c67 | 670 | |
79721e0a | 671 | active = find_active_client(&vgasr_priv.clients); |
66b37c67 DA |
672 | if (!active) |
673 | return 0; | |
674 | ||
675 | active->active = false; | |
6a9ee8af | 676 | |
c91c3fae TI |
677 | set_audio_state(active->id, VGA_SWITCHEROO_OFF); |
678 | ||
6a9ee8af DA |
679 | if (new_client->fb_info) { |
680 | struct fb_event event; | |
7491bfb4 | 681 | |
054430e7 | 682 | console_lock(); |
6a9ee8af DA |
683 | event.info = new_client->fb_info; |
684 | fb_notifier_call_chain(FB_EVENT_REMAP_ALL_CONSOLE, &event); | |
054430e7 | 685 | console_unlock(); |
6a9ee8af DA |
686 | } |
687 | ||
e4cb81d7 | 688 | mutex_lock(&vgasr_priv.mux_hw_lock); |
6a9ee8af | 689 | ret = vgasr_priv.handler->switchto(new_client->id); |
e4cb81d7 | 690 | mutex_unlock(&vgasr_priv.mux_hw_lock); |
6a9ee8af DA |
691 | if (ret) |
692 | return ret; | |
693 | ||
26ec685f TI |
694 | if (new_client->ops->reprobe) |
695 | new_client->ops->reprobe(new_client->pdev); | |
8d608aa6 | 696 | |
6a9ee8af DA |
697 | if (active->pwr_state == VGA_SWITCHEROO_ON) |
698 | vga_switchoff(active); | |
699 | ||
c91c3fae TI |
700 | set_audio_state(new_client->id, VGA_SWITCHEROO_ON); |
701 | ||
6a9ee8af DA |
702 | new_client->active = true; |
703 | return 0; | |
704 | } | |
705 | ||
79721e0a TI |
706 | static bool check_can_switch(void) |
707 | { | |
708 | struct vga_switcheroo_client *client; | |
709 | ||
710 | list_for_each_entry(client, &vgasr_priv.clients, list) { | |
26ec685f | 711 | if (!client->ops->can_switch(client->pdev)) { |
9b0be1eb | 712 | pr_err("client %x refused switch\n", client->id); |
79721e0a TI |
713 | return false; |
714 | } | |
715 | } | |
716 | return true; | |
717 | } | |
718 | ||
6a9ee8af DA |
719 | static ssize_t |
720 | vga_switcheroo_debugfs_write(struct file *filp, const char __user *ubuf, | |
721 | size_t cnt, loff_t *ppos) | |
722 | { | |
723 | char usercmd[64]; | |
79721e0a | 724 | int ret; |
6a9ee8af | 725 | bool delay = false, can_switch; |
851ab954 | 726 | bool just_mux = false; |
fa3e967f | 727 | enum vga_switcheroo_client_id client_id = VGA_SWITCHEROO_UNKNOWN_ID; |
6a9ee8af DA |
728 | struct vga_switcheroo_client *client = NULL; |
729 | ||
730 | if (cnt > 63) | |
731 | cnt = 63; | |
732 | ||
733 | if (copy_from_user(usercmd, ubuf, cnt)) | |
734 | return -EFAULT; | |
735 | ||
736 | mutex_lock(&vgasr_mutex); | |
737 | ||
8c88e50b JS |
738 | if (!vgasr_priv.active) { |
739 | cnt = -EINVAL; | |
740 | goto out; | |
741 | } | |
6a9ee8af DA |
742 | |
743 | /* pwr off the device not in use */ | |
744 | if (strncmp(usercmd, "OFF", 3) == 0) { | |
79721e0a | 745 | list_for_each_entry(client, &vgasr_priv.clients, list) { |
c91c3fae | 746 | if (client->active || client_is_audio(client)) |
6a9ee8af | 747 | continue; |
0d69704a DA |
748 | if (client->driver_power_control) |
749 | continue; | |
c91c3fae | 750 | set_audio_state(client->id, VGA_SWITCHEROO_OFF); |
79721e0a TI |
751 | if (client->pwr_state == VGA_SWITCHEROO_ON) |
752 | vga_switchoff(client); | |
6a9ee8af DA |
753 | } |
754 | goto out; | |
755 | } | |
756 | /* pwr on the device not in use */ | |
757 | if (strncmp(usercmd, "ON", 2) == 0) { | |
79721e0a | 758 | list_for_each_entry(client, &vgasr_priv.clients, list) { |
c91c3fae | 759 | if (client->active || client_is_audio(client)) |
6a9ee8af | 760 | continue; |
0d69704a DA |
761 | if (client->driver_power_control) |
762 | continue; | |
79721e0a TI |
763 | if (client->pwr_state == VGA_SWITCHEROO_OFF) |
764 | vga_switchon(client); | |
c91c3fae | 765 | set_audio_state(client->id, VGA_SWITCHEROO_ON); |
6a9ee8af DA |
766 | } |
767 | goto out; | |
768 | } | |
769 | ||
770 | /* request a delayed switch - test can we switch now */ | |
771 | if (strncmp(usercmd, "DIGD", 4) == 0) { | |
772 | client_id = VGA_SWITCHEROO_IGD; | |
773 | delay = true; | |
774 | } | |
775 | ||
776 | if (strncmp(usercmd, "DDIS", 4) == 0) { | |
777 | client_id = VGA_SWITCHEROO_DIS; | |
778 | delay = true; | |
779 | } | |
780 | ||
781 | if (strncmp(usercmd, "IGD", 3) == 0) | |
782 | client_id = VGA_SWITCHEROO_IGD; | |
783 | ||
784 | if (strncmp(usercmd, "DIS", 3) == 0) | |
785 | client_id = VGA_SWITCHEROO_DIS; | |
786 | ||
fea6f330 | 787 | if (strncmp(usercmd, "MIGD", 4) == 0) { |
851ab954 DA |
788 | just_mux = true; |
789 | client_id = VGA_SWITCHEROO_IGD; | |
790 | } | |
fea6f330 | 791 | if (strncmp(usercmd, "MDIS", 4) == 0) { |
851ab954 DA |
792 | just_mux = true; |
793 | client_id = VGA_SWITCHEROO_DIS; | |
794 | } | |
795 | ||
21c5ba8c | 796 | if (client_id == VGA_SWITCHEROO_UNKNOWN_ID) |
6a9ee8af | 797 | goto out; |
79721e0a TI |
798 | client = find_client_from_id(&vgasr_priv.clients, client_id); |
799 | if (!client) | |
800 | goto out; | |
6a9ee8af DA |
801 | |
802 | vgasr_priv.delayed_switch_active = false; | |
851ab954 DA |
803 | |
804 | if (just_mux) { | |
e4cb81d7 | 805 | mutex_lock(&vgasr_priv.mux_hw_lock); |
851ab954 | 806 | ret = vgasr_priv.handler->switchto(client_id); |
e4cb81d7 | 807 | mutex_unlock(&vgasr_priv.mux_hw_lock); |
851ab954 DA |
808 | goto out; |
809 | } | |
810 | ||
79721e0a | 811 | if (client->active) |
a67b8887 FM |
812 | goto out; |
813 | ||
6a9ee8af | 814 | /* okay we want a switch - test if devices are willing to switch */ |
79721e0a | 815 | can_switch = check_can_switch(); |
6a9ee8af DA |
816 | |
817 | if (can_switch == false && delay == false) | |
818 | goto out; | |
819 | ||
79721e0a | 820 | if (can_switch) { |
66b37c67 DA |
821 | ret = vga_switchto_stage1(client); |
822 | if (ret) | |
9b0be1eb | 823 | pr_err("switching failed stage 1 %d\n", ret); |
66b37c67 DA |
824 | |
825 | ret = vga_switchto_stage2(client); | |
6a9ee8af | 826 | if (ret) |
9b0be1eb | 827 | pr_err("switching failed stage 2 %d\n", ret); |
66b37c67 | 828 | |
6a9ee8af | 829 | } else { |
9b0be1eb | 830 | pr_info("setting delayed switch to client %d\n", client->id); |
6a9ee8af DA |
831 | vgasr_priv.delayed_switch_active = true; |
832 | vgasr_priv.delayed_client_id = client_id; | |
833 | ||
66b37c67 DA |
834 | ret = vga_switchto_stage1(client); |
835 | if (ret) | |
9b0be1eb | 836 | pr_err("delayed switching stage 1 failed %d\n", ret); |
6a9ee8af DA |
837 | } |
838 | ||
839 | out: | |
840 | mutex_unlock(&vgasr_mutex); | |
841 | return cnt; | |
842 | } | |
843 | ||
844 | static const struct file_operations vga_switcheroo_debugfs_fops = { | |
845 | .owner = THIS_MODULE, | |
846 | .open = vga_switcheroo_debugfs_open, | |
847 | .write = vga_switcheroo_debugfs_write, | |
848 | .read = seq_read, | |
849 | .llseek = seq_lseek, | |
850 | .release = single_release, | |
851 | }; | |
852 | ||
853 | static void vga_switcheroo_debugfs_fini(struct vgasr_priv *priv) | |
854 | { | |
798ae0f6 TR |
855 | debugfs_remove(priv->switch_file); |
856 | priv->switch_file = NULL; | |
857 | ||
858 | debugfs_remove(priv->debugfs_root); | |
859 | priv->debugfs_root = NULL; | |
6a9ee8af DA |
860 | } |
861 | ||
862 | static int vga_switcheroo_debugfs_init(struct vgasr_priv *priv) | |
863 | { | |
9b0be1eb TR |
864 | static const char mp[] = "/sys/kernel/debug"; |
865 | ||
6a9ee8af DA |
866 | /* already initialised */ |
867 | if (priv->debugfs_root) | |
868 | return 0; | |
869 | priv->debugfs_root = debugfs_create_dir("vgaswitcheroo", NULL); | |
870 | ||
871 | if (!priv->debugfs_root) { | |
9b0be1eb | 872 | pr_err("Cannot create %s/vgaswitcheroo\n", mp); |
6a9ee8af DA |
873 | goto fail; |
874 | } | |
875 | ||
876 | priv->switch_file = debugfs_create_file("switch", 0644, | |
7491bfb4 TR |
877 | priv->debugfs_root, NULL, |
878 | &vga_switcheroo_debugfs_fops); | |
6a9ee8af | 879 | if (!priv->switch_file) { |
9b0be1eb | 880 | pr_err("cannot create %s/vgaswitcheroo/switch\n", mp); |
6a9ee8af DA |
881 | goto fail; |
882 | } | |
883 | return 0; | |
884 | fail: | |
885 | vga_switcheroo_debugfs_fini(priv); | |
886 | return -1; | |
887 | } | |
888 | ||
a645654b LW |
889 | /** |
890 | * vga_switcheroo_process_delayed_switch() - helper for delayed switching | |
891 | * | |
892 | * Process a delayed switch if one is pending. DRM drivers should call this | |
893 | * from their ->lastclose callback. | |
894 | * | |
895 | * Return: 0 on success. -EINVAL if no delayed switch is pending, if the client | |
896 | * has unregistered in the meantime or if there are other clients blocking the | |
897 | * switch. If the actual switch fails, an error is reported and 0 is returned. | |
898 | */ | |
6a9ee8af DA |
899 | int vga_switcheroo_process_delayed_switch(void) |
900 | { | |
79721e0a | 901 | struct vga_switcheroo_client *client; |
6a9ee8af DA |
902 | int ret; |
903 | int err = -EINVAL; | |
904 | ||
905 | mutex_lock(&vgasr_mutex); | |
906 | if (!vgasr_priv.delayed_switch_active) | |
907 | goto err; | |
908 | ||
9b0be1eb TR |
909 | pr_info("processing delayed switch to %d\n", |
910 | vgasr_priv.delayed_client_id); | |
6a9ee8af | 911 | |
79721e0a TI |
912 | client = find_client_from_id(&vgasr_priv.clients, |
913 | vgasr_priv.delayed_client_id); | |
914 | if (!client || !check_can_switch()) | |
6a9ee8af DA |
915 | goto err; |
916 | ||
66b37c67 | 917 | ret = vga_switchto_stage2(client); |
6a9ee8af | 918 | if (ret) |
9b0be1eb | 919 | pr_err("delayed switching failed stage 2 %d\n", ret); |
6a9ee8af DA |
920 | |
921 | vgasr_priv.delayed_switch_active = false; | |
922 | err = 0; | |
923 | err: | |
924 | mutex_unlock(&vgasr_mutex); | |
925 | return err; | |
926 | } | |
927 | EXPORT_SYMBOL(vga_switcheroo_process_delayed_switch); | |
0d69704a | 928 | |
a645654b LW |
929 | /** |
930 | * DOC: Driver power control | |
931 | * | |
932 | * In this mode of use, the discrete GPU automatically powers up and down at | |
933 | * the discretion of the driver's runtime pm. On muxed machines, the user may | |
934 | * still influence the muxer state by way of the debugfs interface, however | |
935 | * the ON and OFF commands become a no-op for the discrete GPU. | |
936 | * | |
937 | * This mode is the default on Nvidia HybridPower/Optimus and ATI PowerXpress. | |
938 | * Specifying nouveau.runpm=0, radeon.runpm=0 or amdgpu.runpm=0 on the kernel | |
939 | * command line disables it. | |
940 | * | |
941 | * When the driver decides to power up or down, it notifies vga_switcheroo | |
942 | * thereof so that it can (a) power the audio device on the GPU up or down, | |
943 | * and (b) update its internal power state representation for the device. | |
944 | * This is achieved by vga_switcheroo_set_dynamic_switch(). | |
945 | * | |
946 | * After the GPU has been suspended, the handler needs to be called to cut | |
947 | * power to the GPU. Likewise it needs to reinstate power before the GPU | |
948 | * can resume. This is achieved by vga_switcheroo_init_domain_pm_ops(), | |
949 | * which augments the GPU's suspend/resume functions by the requisite | |
950 | * calls to the handler. | |
951 | * | |
952 | * When the audio device resumes, the GPU needs to be woken. This is achieved | |
953 | * by vga_switcheroo_init_domain_pm_optimus_hdmi_audio(), which augments the | |
954 | * audio device's resume function. | |
955 | * | |
956 | * On muxed machines, if the mux is initially switched to the discrete GPU, | |
957 | * the user ends up with a black screen when the GPU powers down after boot. | |
958 | * As a workaround, the mux is forced to the integrated GPU on runtime suspend, | |
959 | * cf. https://bugs.freedesktop.org/show_bug.cgi?id=75917 | |
960 | */ | |
961 | ||
7491bfb4 TR |
962 | static void vga_switcheroo_power_switch(struct pci_dev *pdev, |
963 | enum vga_switcheroo_state state) | |
0d69704a DA |
964 | { |
965 | struct vga_switcheroo_client *client; | |
966 | ||
967 | if (!vgasr_priv.handler->power_state) | |
968 | return; | |
969 | ||
970 | client = find_client_from_pci(&vgasr_priv.clients, pdev); | |
971 | if (!client) | |
972 | return; | |
973 | ||
974 | if (!client->driver_power_control) | |
975 | return; | |
976 | ||
977 | vgasr_priv.handler->power_state(client->id, state); | |
978 | } | |
979 | ||
a645654b LW |
980 | /** |
981 | * vga_switcheroo_set_dynamic_switch() - helper for driver power control | |
982 | * @pdev: client pci device | |
983 | * @dynamic: new power state | |
984 | * | |
985 | * Helper for GPUs whose power state is controlled by the driver's runtime pm. | |
986 | * When the driver decides to power up or down, it notifies vga_switcheroo | |
987 | * thereof using this helper so that it can (a) power the audio device on | |
988 | * the GPU up or down, and (b) update its internal power state representation | |
989 | * for the device. | |
990 | */ | |
7491bfb4 TR |
991 | void vga_switcheroo_set_dynamic_switch(struct pci_dev *pdev, |
992 | enum vga_switcheroo_state dynamic) | |
0d69704a DA |
993 | { |
994 | struct vga_switcheroo_client *client; | |
995 | ||
8f12a311 | 996 | mutex_lock(&vgasr_mutex); |
0d69704a | 997 | client = find_client_from_pci(&vgasr_priv.clients, pdev); |
8f12a311 LW |
998 | if (!client || !client->driver_power_control) { |
999 | mutex_unlock(&vgasr_mutex); | |
0d69704a | 1000 | return; |
8f12a311 | 1001 | } |
0d69704a DA |
1002 | |
1003 | client->pwr_state = dynamic; | |
1004 | set_audio_state(client->id, dynamic); | |
8f12a311 | 1005 | mutex_unlock(&vgasr_mutex); |
0d69704a DA |
1006 | } |
1007 | EXPORT_SYMBOL(vga_switcheroo_set_dynamic_switch); | |
1008 | ||
1009 | /* switcheroo power domain */ | |
1010 | static int vga_switcheroo_runtime_suspend(struct device *dev) | |
1011 | { | |
1012 | struct pci_dev *pdev = to_pci_dev(dev); | |
1013 | int ret; | |
1014 | ||
1015 | ret = dev->bus->pm->runtime_suspend(dev); | |
1016 | if (ret) | |
1017 | return ret; | |
8f12a311 | 1018 | mutex_lock(&vgasr_mutex); |
e4cb81d7 LW |
1019 | if (vgasr_priv.handler->switchto) { |
1020 | mutex_lock(&vgasr_priv.mux_hw_lock); | |
f2bc5616 | 1021 | vgasr_priv.handler->switchto(VGA_SWITCHEROO_IGD); |
e4cb81d7 LW |
1022 | mutex_unlock(&vgasr_priv.mux_hw_lock); |
1023 | } | |
0d69704a | 1024 | vga_switcheroo_power_switch(pdev, VGA_SWITCHEROO_OFF); |
8f12a311 | 1025 | mutex_unlock(&vgasr_mutex); |
0d69704a DA |
1026 | return 0; |
1027 | } | |
1028 | ||
1029 | static int vga_switcheroo_runtime_resume(struct device *dev) | |
1030 | { | |
1031 | struct pci_dev *pdev = to_pci_dev(dev); | |
1032 | int ret; | |
1033 | ||
8f12a311 | 1034 | mutex_lock(&vgasr_mutex); |
0d69704a | 1035 | vga_switcheroo_power_switch(pdev, VGA_SWITCHEROO_ON); |
8f12a311 | 1036 | mutex_unlock(&vgasr_mutex); |
0d69704a DA |
1037 | ret = dev->bus->pm->runtime_resume(dev); |
1038 | if (ret) | |
1039 | return ret; | |
1040 | ||
1041 | return 0; | |
1042 | } | |
1043 | ||
a645654b LW |
1044 | /** |
1045 | * vga_switcheroo_init_domain_pm_ops() - helper for driver power control | |
1046 | * @dev: vga client device | |
1047 | * @domain: power domain | |
1048 | * | |
1049 | * Helper for GPUs whose power state is controlled by the driver's runtime pm. | |
1050 | * After the GPU has been suspended, the handler needs to be called to cut | |
1051 | * power to the GPU. Likewise it needs to reinstate power before the GPU | |
1052 | * can resume. To this end, this helper augments the suspend/resume functions | |
1053 | * by the requisite calls to the handler. It needs only be called on platforms | |
1054 | * where the power switch is separate to the device being powered down. | |
1055 | */ | |
7491bfb4 TR |
1056 | int vga_switcheroo_init_domain_pm_ops(struct device *dev, |
1057 | struct dev_pm_domain *domain) | |
0d69704a DA |
1058 | { |
1059 | /* copy over all the bus versions */ | |
1060 | if (dev->bus && dev->bus->pm) { | |
1061 | domain->ops = *dev->bus->pm; | |
1062 | domain->ops.runtime_suspend = vga_switcheroo_runtime_suspend; | |
1063 | domain->ops.runtime_resume = vga_switcheroo_runtime_resume; | |
1064 | ||
989561de | 1065 | dev_pm_domain_set(dev, domain); |
0d69704a DA |
1066 | return 0; |
1067 | } | |
989561de | 1068 | dev_pm_domain_set(dev, NULL); |
0d69704a DA |
1069 | return -EINVAL; |
1070 | } | |
1071 | EXPORT_SYMBOL(vga_switcheroo_init_domain_pm_ops); | |
1072 | ||
766a53d0 AD |
1073 | void vga_switcheroo_fini_domain_pm_ops(struct device *dev) |
1074 | { | |
989561de | 1075 | dev_pm_domain_set(dev, NULL); |
766a53d0 AD |
1076 | } |
1077 | EXPORT_SYMBOL(vga_switcheroo_fini_domain_pm_ops); | |
1078 | ||
0d69704a DA |
1079 | static int vga_switcheroo_runtime_resume_hdmi_audio(struct device *dev) |
1080 | { | |
1081 | struct pci_dev *pdev = to_pci_dev(dev); | |
8f12a311 LW |
1082 | struct vga_switcheroo_client *client; |
1083 | struct device *video_dev = NULL; | |
0d69704a | 1084 | int ret; |
0d69704a DA |
1085 | |
1086 | /* we need to check if we have to switch back on the video | |
1087 | device so the audio device can come back */ | |
8f12a311 | 1088 | mutex_lock(&vgasr_mutex); |
0d69704a | 1089 | list_for_each_entry(client, &vgasr_priv.clients, list) { |
7491bfb4 TR |
1090 | if (PCI_SLOT(client->pdev->devfn) == PCI_SLOT(pdev->devfn) && |
1091 | client_is_vga(client)) { | |
8f12a311 | 1092 | video_dev = &client->pdev->dev; |
0d69704a DA |
1093 | break; |
1094 | } | |
1095 | } | |
8f12a311 LW |
1096 | mutex_unlock(&vgasr_mutex); |
1097 | ||
1098 | if (video_dev) { | |
1099 | ret = pm_runtime_get_sync(video_dev); | |
1100 | if (ret && ret != 1) | |
1101 | return ret; | |
1102 | } | |
0d69704a DA |
1103 | ret = dev->bus->pm->runtime_resume(dev); |
1104 | ||
1105 | /* put the reference for the gpu */ | |
8f12a311 LW |
1106 | if (video_dev) { |
1107 | pm_runtime_mark_last_busy(video_dev); | |
1108 | pm_runtime_put_autosuspend(video_dev); | |
0d69704a DA |
1109 | } |
1110 | return ret; | |
1111 | } | |
1112 | ||
a645654b LW |
1113 | /** |
1114 | * vga_switcheroo_init_domain_pm_optimus_hdmi_audio() - helper for driver | |
1115 | * power control | |
1116 | * @dev: audio client device | |
1117 | * @domain: power domain | |
1118 | * | |
1119 | * Helper for GPUs whose power state is controlled by the driver's runtime pm. | |
1120 | * When the audio device resumes, the GPU needs to be woken. This helper | |
1121 | * augments the audio device's resume function to do that. | |
1122 | * | |
1123 | * Return: 0 on success, -EINVAL if no power management operations are | |
1124 | * defined for this device. | |
1125 | */ | |
7491bfb4 TR |
1126 | int |
1127 | vga_switcheroo_init_domain_pm_optimus_hdmi_audio(struct device *dev, | |
1128 | struct dev_pm_domain *domain) | |
0d69704a DA |
1129 | { |
1130 | /* copy over all the bus versions */ | |
1131 | if (dev->bus && dev->bus->pm) { | |
1132 | domain->ops = *dev->bus->pm; | |
7491bfb4 TR |
1133 | domain->ops.runtime_resume = |
1134 | vga_switcheroo_runtime_resume_hdmi_audio; | |
0d69704a | 1135 | |
989561de | 1136 | dev_pm_domain_set(dev, domain); |
0d69704a DA |
1137 | return 0; |
1138 | } | |
989561de | 1139 | dev_pm_domain_set(dev, NULL); |
0d69704a DA |
1140 | return -EINVAL; |
1141 | } | |
1142 | EXPORT_SYMBOL(vga_switcheroo_init_domain_pm_optimus_hdmi_audio); |