blob: cbd7c986d926e072a234b248762e185fda1eebe4 [file] [log] [blame]
Dave Airlie6a9ee8a2010-02-01 15:38:10 +10001/*
Lukas Wunnera6456542015-08-23 15:18:55 +02002 * vga_switcheroo.c - Support for laptop with dual GPU using one set of outputs
3 *
Dave Airlie6a9ee8a2010-02-01 15:38:10 +10004 * Copyright (c) 2010 Red Hat Inc.
5 * Author : Dave Airlie <airlied@redhat.com>
6 *
Lukas Wunnera6456542015-08-23 15:18:55 +02007 * Copyright (c) 2015 Lukas Wunner <lukas@wunner.de>
Dave Airlie6a9ee8a2010-02-01 15:38:10 +10008 *
Lukas Wunnera6456542015-08-23 15:18:55 +02009 * 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:
Dave Airlie6a9ee8a2010-02-01 15:38:10 +100015 *
Lukas Wunnera6456542015-08-23 15:18:55 +020016 * 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.
Thierry Reding71309272015-08-12 16:32:09 +020019 *
Lukas Wunnera6456542015-08-23 15:18:55 +020020 * 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.
Thierry Reding71309272015-08-12 16:32:09 +020028 *
Dave Airlie6a9ee8a2010-02-01 15:38:10 +100029 */
30
Thierry Reding9b0be1e2015-08-12 16:32:10 +020031#define pr_fmt(fmt) "vga_switcheroo: " fmt
32
Lukas Wunner41278382015-09-05 13:40:23 +020033#include <linux/console.h>
Dave Airlie6a9ee8a2010-02-01 15:38:10 +100034#include <linux/debugfs.h>
35#include <linux/fb.h>
Lukas Wunner41278382015-09-05 13:40:23 +020036#include <linux/fs.h>
37#include <linux/module.h>
Dave Airlie6a9ee8a2010-02-01 15:38:10 +100038#include <linux/pci.h>
Tomeu Vizoso989561d2016-01-07 16:46:13 +010039#include <linux/pm_domain.h>
Dave Airlie0d697042012-09-10 12:28:36 +100040#include <linux/pm_runtime.h>
Lukas Wunner41278382015-09-05 13:40:23 +020041#include <linux/seq_file.h>
42#include <linux/uaccess.h>
Matthew Garrett2fbe8c72012-04-16 16:26:03 -040043#include <linux/vgaarb.h>
Lukas Wunner41278382015-09-05 13:40:23 +020044#include <linux/vga_switcheroo.h>
Matthew Garrett2fbe8c72012-04-16 16:26:03 -040045
Lukas Wunnera6456542015-08-23 15:18:55 +020046/**
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 *
Lukas Wunner3a848662016-01-02 18:47:17 +010067 * DRM drivers register GPUs with vga_switcheroo, these are henceforth called
Lukas Wunnera6456542015-08-23 15:18:55 +020068 * 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.
Lukas Wunnere4cb81d2016-01-11 20:09:20 +010077 *
Lukas Wunnera6456542015-08-23 15:18:55 +020078 * 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
Lukas Wunnere4cb81d2016-01-11 20:09:20 +010080 * 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.
Lukas Wunnera6456542015-08-23 15:18:55 +020088 */
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
Lukas Wunner21c5ba82015-08-28 13:30:32 +020096 * @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()
Lukas Wunnera6456542015-08-23 15:18:55 +020099 * @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 */
Dave Airlie6a9ee8a2010-02-01 15:38:10 +1000109struct vga_switcheroo_client {
110 struct pci_dev *pdev;
111 struct fb_info *fb_info;
Lukas Wunner203d0272015-08-28 11:56:26 +0200112 enum vga_switcheroo_state pwr_state;
Takashi Iwai26ec6852012-05-11 07:51:17 +0200113 const struct vga_switcheroo_client_ops *ops;
Lukas Wunnerfa3e9672015-08-28 12:54:07 +0200114 enum vga_switcheroo_client_id id;
Dave Airlie6a9ee8a2010-02-01 15:38:10 +1000115 bool active;
Dave Airlie0d697042012-09-10 12:28:36 +1000116 bool driver_power_control;
Takashi Iwai79721e02012-04-26 12:55:59 +0200117 struct list_head list;
Dave Airlie6a9ee8a2010-02-01 15:38:10 +1000118};
119
Lukas Wunnera6456542015-08-23 15:18:55 +0200120/*
121 * protects access to struct vgasr_priv
122 */
Dave Airlie6a9ee8a2010-02-01 15:38:10 +1000123static DEFINE_MUTEX(vgasr_mutex);
124
Lukas Wunnera6456542015-08-23 15:18:55 +0200125/**
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
Lukas Wunner156d7d42016-01-11 20:09:20 +0100137 * @handler_flags: flags of registered handler
Lukas Wunnere4cb81d2016-01-11 20:09:20 +0100138 * @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
Lukas Wunnera6456542015-08-23 15:18:55 +0200141 *
142 * vga_switcheroo private data. Currently only one vga_switcheroo instance
143 * per system is supported.
144 */
Dave Airlie6a9ee8a2010-02-01 15:38:10 +1000145struct vgasr_priv {
Dave Airlie6a9ee8a2010-02-01 15:38:10 +1000146 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;
Takashi Iwai79721e02012-04-26 12:55:59 +0200154 struct list_head clients;
Dave Airlie6a9ee8a2010-02-01 15:38:10 +1000155
Lukas Wunner5d170132015-10-18 13:05:40 +0200156 const struct vga_switcheroo_handler *handler;
Lukas Wunner156d7d42016-01-11 20:09:20 +0100157 enum vga_switcheroo_handler_flags_t handler_flags;
Lukas Wunnere4cb81d2016-01-11 20:09:20 +0100158 struct mutex mux_hw_lock;
159 int old_ddc_owner;
Dave Airlie6a9ee8a2010-02-01 15:38:10 +1000160};
161
Takashi Iwai3e9e63d2012-04-26 14:29:48 +0200162#define ID_BIT_AUDIO 0x100
163#define client_is_audio(c) ((c)->id & ID_BIT_AUDIO)
Lukas Wunner21c5ba82015-08-28 13:30:32 +0200164#define client_is_vga(c) ((c)->id == VGA_SWITCHEROO_UNKNOWN_ID || \
165 !client_is_audio(c))
Takashi Iwai3e9e63d2012-04-26 14:29:48 +0200166#define client_id(c) ((c)->id & ~ID_BIT_AUDIO)
167
Dave Airlie6a9ee8a2010-02-01 15:38:10 +1000168static int vga_switcheroo_debugfs_init(struct vgasr_priv *priv);
169static void vga_switcheroo_debugfs_fini(struct vgasr_priv *priv);
170
171/* only one switcheroo per system */
Takashi Iwai79721e02012-04-26 12:55:59 +0200172static struct vgasr_priv vgasr_priv = {
173 .clients = LIST_HEAD_INIT(vgasr_priv.clients),
Lukas Wunnere4cb81d2016-01-11 20:09:20 +0100174 .mux_hw_lock = __MUTEX_INITIALIZER(vgasr_priv.mux_hw_lock),
Takashi Iwai79721e02012-04-26 12:55:59 +0200175};
Dave Airlie6a9ee8a2010-02-01 15:38:10 +1000176
Seth Forshee36704c02012-08-17 11:17:03 -0500177static bool vga_switcheroo_ready(void)
Dave Airlie6a9ee8a2010-02-01 15:38:10 +1000178{
Seth Forshee36704c02012-08-17 11:17:03 -0500179 /* we're ready if we get two clients + handler */
180 return !vgasr_priv.active &&
181 vgasr_priv.registered_clients == 2 && vgasr_priv.handler;
Dave Airlie6a9ee8a2010-02-01 15:38:10 +1000182}
Dave Airlie6a9ee8a2010-02-01 15:38:10 +1000183
184static void vga_switcheroo_enable(void)
185{
Dave Airlie6a9ee8a2010-02-01 15:38:10 +1000186 int ret;
Takashi Iwai79721e02012-04-26 12:55:59 +0200187 struct vga_switcheroo_client *client;
188
Dave Airlie6a9ee8a2010-02-01 15:38:10 +1000189 /* call the handler to init */
Seth Forsheee99eac52012-08-17 11:17:02 -0500190 if (vgasr_priv.handler->init)
191 vgasr_priv.handler->init();
Dave Airlie6a9ee8a2010-02-01 15:38:10 +1000192
Takashi Iwai79721e02012-04-26 12:55:59 +0200193 list_for_each_entry(client, &vgasr_priv.clients, list) {
Lukas Wunner21c5ba82015-08-28 13:30:32 +0200194 if (client->id != VGA_SWITCHEROO_UNKNOWN_ID)
Takashi Iwai3e9e63d2012-04-26 14:29:48 +0200195 continue;
Takashi Iwai79721e02012-04-26 12:55:59 +0200196 ret = vgasr_priv.handler->get_client_id(client->pdev);
Dave Airlie6a9ee8a2010-02-01 15:38:10 +1000197 if (ret < 0)
198 return;
199
Takashi Iwai79721e02012-04-26 12:55:59 +0200200 client->id = ret;
Dave Airlie6a9ee8a2010-02-01 15:38:10 +1000201 }
202 vga_switcheroo_debugfs_init(&vgasr_priv);
203 vgasr_priv.active = true;
204}
205
Lukas Wunnera6456542015-08-23 15:18:55 +0200206/**
207 * vga_switcheroo_register_handler() - register handler
208 * @handler: handler callbacks
Lukas Wunner156d7d42016-01-11 20:09:20 +0100209 * @handler_flags: handler flags
Lukas Wunnera6456542015-08-23 15:18:55 +0200210 *
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 */
Lukas Wunner156d7d42016-01-11 20:09:20 +0100216int vga_switcheroo_register_handler(const struct vga_switcheroo_handler *handler,
217 enum vga_switcheroo_handler_flags_t handler_flags)
Seth Forshee36704c02012-08-17 11:17:03 -0500218{
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;
Lukas Wunner156d7d42016-01-11 20:09:20 +0100226 vgasr_priv.handler_flags = handler_flags;
Seth Forshee36704c02012-08-17 11:17:03 -0500227 if (vga_switcheroo_ready()) {
Thierry Reding9b0be1e2015-08-12 16:32:10 +0200228 pr_info("enabled\n");
Seth Forshee36704c02012-08-17 11:17:03 -0500229 vga_switcheroo_enable();
230 }
231 mutex_unlock(&vgasr_mutex);
232 return 0;
233}
234EXPORT_SYMBOL(vga_switcheroo_register_handler);
235
Lukas Wunnera6456542015-08-23 15:18:55 +0200236/**
237 * vga_switcheroo_unregister_handler() - unregister handler
238 *
239 * Unregister handler. Disable vga_switcheroo.
240 */
Seth Forshee36704c02012-08-17 11:17:03 -0500241void vga_switcheroo_unregister_handler(void)
242{
243 mutex_lock(&vgasr_mutex);
Lukas Wunnere4cb81d2016-01-11 20:09:20 +0100244 mutex_lock(&vgasr_priv.mux_hw_lock);
Lukas Wunner156d7d42016-01-11 20:09:20 +0100245 vgasr_priv.handler_flags = 0;
Seth Forshee36704c02012-08-17 11:17:03 -0500246 vgasr_priv.handler = NULL;
247 if (vgasr_priv.active) {
Thierry Reding9b0be1e2015-08-12 16:32:10 +0200248 pr_info("disabled\n");
Seth Forshee36704c02012-08-17 11:17:03 -0500249 vga_switcheroo_debugfs_fini(&vgasr_priv);
250 vgasr_priv.active = false;
251 }
Lukas Wunnere4cb81d2016-01-11 20:09:20 +0100252 mutex_unlock(&vgasr_priv.mux_hw_lock);
Seth Forshee36704c02012-08-17 11:17:03 -0500253 mutex_unlock(&vgasr_mutex);
254}
255EXPORT_SYMBOL(vga_switcheroo_unregister_handler);
256
Lukas Wunner156d7d42016-01-11 20:09:20 +0100257/**
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 */
265enum vga_switcheroo_handler_flags_t vga_switcheroo_handler_flags(void)
266{
267 return vgasr_priv.handler_flags;
268}
269EXPORT_SYMBOL(vga_switcheroo_handler_flags);
270
Takashi Iwai3e9e63d2012-04-26 14:29:48 +0200271static int register_client(struct pci_dev *pdev,
272 const struct vga_switcheroo_client_ops *ops,
Lukas Wunnerfa3e9672015-08-28 12:54:07 +0200273 enum vga_switcheroo_client_id id, bool active,
274 bool driver_power_control)
Dave Airlie6a9ee8a2010-02-01 15:38:10 +1000275{
Takashi Iwai79721e02012-04-26 12:55:59 +0200276 struct vga_switcheroo_client *client;
277
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;
Takashi Iwai26ec6852012-05-11 07:51:17 +0200284 client->ops = ops;
Takashi Iwai3e9e63d2012-04-26 14:29:48 +0200285 client->id = id;
286 client->active = active;
Dave Airlie0d697042012-09-10 12:28:36 +1000287 client->driver_power_control = driver_power_control;
Dave Airlie6a9ee8a2010-02-01 15:38:10 +1000288
289 mutex_lock(&vgasr_mutex);
Takashi Iwai79721e02012-04-26 12:55:59 +0200290 list_add_tail(&client->list, &vgasr_priv.clients);
Takashi Iwai3e9e63d2012-04-26 14:29:48 +0200291 if (client_is_vga(client))
292 vgasr_priv.registered_clients++;
Dave Airlie6a9ee8a2010-02-01 15:38:10 +1000293
Seth Forshee36704c02012-08-17 11:17:03 -0500294 if (vga_switcheroo_ready()) {
Thierry Reding9b0be1e2015-08-12 16:32:10 +0200295 pr_info("enabled\n");
Dave Airlie6a9ee8a2010-02-01 15:38:10 +1000296 vga_switcheroo_enable();
297 }
298 mutex_unlock(&vgasr_mutex);
299 return 0;
300}
Takashi Iwai3e9e63d2012-04-26 14:29:48 +0200301
Lukas Wunnera6456542015-08-23 15:18:55 +0200302/**
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 */
Takashi Iwai3e9e63d2012-04-26 14:29:48 +0200315int vga_switcheroo_register_client(struct pci_dev *pdev,
Dave Airlie0d697042012-09-10 12:28:36 +1000316 const struct vga_switcheroo_client_ops *ops,
317 bool driver_power_control)
Takashi Iwai3e9e63d2012-04-26 14:29:48 +0200318{
Lukas Wunner21c5ba82015-08-28 13:30:32 +0200319 return register_client(pdev, ops, VGA_SWITCHEROO_UNKNOWN_ID,
Thierry Reding7491bfb2015-08-12 16:32:11 +0200320 pdev == vga_default_device(),
321 driver_power_control);
Takashi Iwai3e9e63d2012-04-26 14:29:48 +0200322}
Dave Airlie6a9ee8a2010-02-01 15:38:10 +1000323EXPORT_SYMBOL(vga_switcheroo_register_client);
324
Lukas Wunnera6456542015-08-23 15:18:55 +0200325/**
326 * vga_switcheroo_register_audio_client - register audio client
327 * @pdev: client pci device
328 * @ops: client callbacks
Lukas Wunnerfa3e9672015-08-28 12:54:07 +0200329 * @id: client identifier
Lukas Wunnera6456542015-08-23 15:18:55 +0200330 *
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 */
Takashi Iwai3e9e63d2012-04-26 14:29:48 +0200336int vga_switcheroo_register_audio_client(struct pci_dev *pdev,
337 const struct vga_switcheroo_client_ops *ops,
Lukas Wunnerfa3e9672015-08-28 12:54:07 +0200338 enum vga_switcheroo_client_id id)
Takashi Iwai3e9e63d2012-04-26 14:29:48 +0200339{
Lukas Wunner21b45672015-08-27 16:43:43 +0200340 return register_client(pdev, ops, id | ID_BIT_AUDIO, false, false);
Takashi Iwai3e9e63d2012-04-26 14:29:48 +0200341}
342EXPORT_SYMBOL(vga_switcheroo_register_audio_client);
343
Takashi Iwai79721e02012-04-26 12:55:59 +0200344static struct vga_switcheroo_client *
345find_client_from_pci(struct list_head *head, struct pci_dev *pdev)
346{
347 struct vga_switcheroo_client *client;
Thierry Reding7491bfb2015-08-12 16:32:11 +0200348
Takashi Iwai79721e02012-04-26 12:55:59 +0200349 list_for_each_entry(client, head, list)
350 if (client->pdev == pdev)
351 return client;
352 return NULL;
353}
354
355static struct vga_switcheroo_client *
Lukas Wunnerfa3e9672015-08-28 12:54:07 +0200356find_client_from_id(struct list_head *head,
357 enum vga_switcheroo_client_id client_id)
Takashi Iwai79721e02012-04-26 12:55:59 +0200358{
359 struct vga_switcheroo_client *client;
Thierry Reding7491bfb2015-08-12 16:32:11 +0200360
Takashi Iwai79721e02012-04-26 12:55:59 +0200361 list_for_each_entry(client, head, list)
362 if (client->id == client_id)
363 return client;
364 return NULL;
365}
366
367static struct vga_switcheroo_client *
368find_active_client(struct list_head *head)
369{
370 struct vga_switcheroo_client *client;
Thierry Reding7491bfb2015-08-12 16:32:11 +0200371
Takashi Iwai79721e02012-04-26 12:55:59 +0200372 list_for_each_entry(client, head, list)
Lukas Wunner21b45672015-08-27 16:43:43 +0200373 if (client->active)
Takashi Iwai79721e02012-04-26 12:55:59 +0200374 return client;
375 return NULL;
376}
377
Lukas Wunnera6456542015-08-23 15:18:55 +0200378/**
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 */
Lukas Wunner203d0272015-08-28 11:56:26 +0200387enum vga_switcheroo_state vga_switcheroo_get_client_state(struct pci_dev *pdev)
Takashi Iwaic8e9cf72012-06-07 12:15:15 +0200388{
389 struct vga_switcheroo_client *client;
Lukas Wunner8f12a312015-08-23 23:23:02 +0200390 enum vga_switcheroo_state ret;
Takashi Iwaic8e9cf72012-06-07 12:15:15 +0200391
Lukas Wunner8f12a312015-08-23 23:23:02 +0200392 mutex_lock(&vgasr_mutex);
Takashi Iwaic8e9cf72012-06-07 12:15:15 +0200393 client = find_client_from_pci(&vgasr_priv.clients, pdev);
394 if (!client)
Lukas Wunner8f12a312015-08-23 23:23:02 +0200395 ret = VGA_SWITCHEROO_NOT_FOUND;
Lukas Wunner8f12a312015-08-23 23:23:02 +0200396 else
397 ret = client->pwr_state;
398 mutex_unlock(&vgasr_mutex);
399 return ret;
Takashi Iwaic8e9cf72012-06-07 12:15:15 +0200400}
401EXPORT_SYMBOL(vga_switcheroo_get_client_state);
402
Lukas Wunnera6456542015-08-23 15:18:55 +0200403/**
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 */
Dave Airlie6a9ee8a2010-02-01 15:38:10 +1000409void vga_switcheroo_unregister_client(struct pci_dev *pdev)
410{
Takashi Iwai79721e02012-04-26 12:55:59 +0200411 struct vga_switcheroo_client *client;
Dave Airlie6a9ee8a2010-02-01 15:38:10 +1000412
413 mutex_lock(&vgasr_mutex);
Takashi Iwai79721e02012-04-26 12:55:59 +0200414 client = find_client_from_pci(&vgasr_priv.clients, pdev);
415 if (client) {
Takashi Iwai3e9e63d2012-04-26 14:29:48 +0200416 if (client_is_vga(client))
417 vgasr_priv.registered_clients--;
Takashi Iwai79721e02012-04-26 12:55:59 +0200418 list_del(&client->list);
419 kfree(client);
Dave Airlie6a9ee8a2010-02-01 15:38:10 +1000420 }
Takashi Iwai3e9e63d2012-04-26 14:29:48 +0200421 if (vgasr_priv.active && vgasr_priv.registered_clients < 2) {
Thierry Reding9b0be1e2015-08-12 16:32:10 +0200422 pr_info("disabled\n");
Takashi Iwai3e9e63d2012-04-26 14:29:48 +0200423 vga_switcheroo_debugfs_fini(&vgasr_priv);
424 vgasr_priv.active = false;
425 }
Dave Airlie6a9ee8a2010-02-01 15:38:10 +1000426 mutex_unlock(&vgasr_mutex);
427}
428EXPORT_SYMBOL(vga_switcheroo_unregister_client);
429
Lukas Wunnera6456542015-08-23 15:18:55 +0200430/**
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 */
Dave Airlie6a9ee8a2010-02-01 15:38:10 +1000438void vga_switcheroo_client_fb_set(struct pci_dev *pdev,
439 struct fb_info *info)
440{
Takashi Iwai79721e02012-04-26 12:55:59 +0200441 struct vga_switcheroo_client *client;
Dave Airlie6a9ee8a2010-02-01 15:38:10 +1000442
443 mutex_lock(&vgasr_mutex);
Takashi Iwai79721e02012-04-26 12:55:59 +0200444 client = find_client_from_pci(&vgasr_priv.clients, pdev);
445 if (client)
446 client->fb_info = info;
Dave Airlie6a9ee8a2010-02-01 15:38:10 +1000447 mutex_unlock(&vgasr_mutex);
448}
449EXPORT_SYMBOL(vga_switcheroo_client_fb_set);
450
Lukas Wunnera6456542015-08-23 15:18:55 +0200451/**
Lukas Wunnere4cb81d2016-01-11 20:09:20 +0100452 * 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 */
470int 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}
484EXPORT_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 */
502int 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}
519EXPORT_SYMBOL(vga_switcheroo_unlock_ddc);
520
521/**
Lukas Wunnera6456542015-08-23 15:18:55 +0200522 * 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
Dave Airlie6a9ee8a2010-02-01 15:38:10 +1000557static int vga_switcheroo_show(struct seq_file *m, void *v)
558{
Takashi Iwai79721e02012-04-26 12:55:59 +0200559 struct vga_switcheroo_client *client;
560 int i = 0;
Thierry Reding7491bfb2015-08-12 16:32:11 +0200561
Dave Airlie6a9ee8a2010-02-01 15:38:10 +1000562 mutex_lock(&vgasr_mutex);
Takashi Iwai79721e02012-04-26 12:55:59 +0200563 list_for_each_entry(client, &vgasr_priv.clients, list) {
Dave Airlie0d697042012-09-10 12:28:36 +1000564 seq_printf(m, "%d:%s%s:%c:%s%s:%s\n", i,
Thierry Reding7491bfb2015-08-12 16:32:11 +0200565 client_id(client) == VGA_SWITCHEROO_DIS ? "DIS" :
566 "IGD",
Takashi Iwai3e9e63d2012-04-26 14:29:48 +0200567 client_is_vga(client) ? "" : "-Audio",
Takashi Iwai79721e02012-04-26 12:55:59 +0200568 client->active ? '+' : ' ',
Dave Airlie0d697042012-09-10 12:28:36 +1000569 client->driver_power_control ? "Dyn" : "",
Takashi Iwai79721e02012-04-26 12:55:59 +0200570 client->pwr_state ? "Pwr" : "Off",
571 pci_name(client->pdev));
572 i++;
Dave Airlie6a9ee8a2010-02-01 15:38:10 +1000573 }
574 mutex_unlock(&vgasr_mutex);
575 return 0;
576}
577
578static int vga_switcheroo_debugfs_open(struct inode *inode, struct file *file)
579{
580 return single_open(file, vga_switcheroo_show, NULL);
581}
582
583static int vga_switchon(struct vga_switcheroo_client *client)
584{
Dave Airlie0d697042012-09-10 12:28:36 +1000585 if (client->driver_power_control)
586 return 0;
Dave Airlie5cfb3c32010-12-06 12:31:50 +1000587 if (vgasr_priv.handler->power_state)
588 vgasr_priv.handler->power_state(client->id, VGA_SWITCHEROO_ON);
Dave Airlie6a9ee8a2010-02-01 15:38:10 +1000589 /* call the driver callback to turn on device */
Takashi Iwai26ec6852012-05-11 07:51:17 +0200590 client->ops->set_gpu_state(client->pdev, VGA_SWITCHEROO_ON);
Dave Airlie6a9ee8a2010-02-01 15:38:10 +1000591 client->pwr_state = VGA_SWITCHEROO_ON;
592 return 0;
593}
594
595static int vga_switchoff(struct vga_switcheroo_client *client)
596{
Dave Airlie0d697042012-09-10 12:28:36 +1000597 if (client->driver_power_control)
598 return 0;
Dave Airlie6a9ee8a2010-02-01 15:38:10 +1000599 /* call the driver callback to turn off device */
Takashi Iwai26ec6852012-05-11 07:51:17 +0200600 client->ops->set_gpu_state(client->pdev, VGA_SWITCHEROO_OFF);
Dave Airlie5cfb3c32010-12-06 12:31:50 +1000601 if (vgasr_priv.handler->power_state)
602 vgasr_priv.handler->power_state(client->id, VGA_SWITCHEROO_OFF);
Dave Airlie6a9ee8a2010-02-01 15:38:10 +1000603 client->pwr_state = VGA_SWITCHEROO_OFF;
604 return 0;
605}
606
Lukas Wunnerfa3e9672015-08-28 12:54:07 +0200607static void set_audio_state(enum vga_switcheroo_client_id id,
608 enum vga_switcheroo_state state)
Takashi Iwai3e9e63d2012-04-26 14:29:48 +0200609{
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
Dave Airlie66b37c62010-12-07 14:24:25 +1000619/* stage one happens before delay */
620static int vga_switchto_stage1(struct vga_switcheroo_client *new_client)
Dave Airlie6a9ee8a2010-02-01 15:38:10 +1000621{
Takashi Iwai79721e02012-04-26 12:55:59 +0200622 struct vga_switcheroo_client *active;
Dave Airlie6a9ee8a2010-02-01 15:38:10 +1000623
Takashi Iwai79721e02012-04-26 12:55:59 +0200624 active = find_active_client(&vgasr_priv.clients);
Dave Airlie6a9ee8a2010-02-01 15:38:10 +1000625 if (!active)
626 return 0;
627
Dave Airlie6a9ee8a2010-02-01 15:38:10 +1000628 if (new_client->pwr_state == VGA_SWITCHEROO_OFF)
629 vga_switchon(new_client);
630
Matthew Garrett2fbe8c72012-04-16 16:26:03 -0400631 vga_set_default_device(new_client->pdev);
Dave Airlie66b37c62010-12-07 14:24:25 +1000632 return 0;
633}
634
635/* post delay */
636static int vga_switchto_stage2(struct vga_switcheroo_client *new_client)
637{
638 int ret;
Takashi Iwai79721e02012-04-26 12:55:59 +0200639 struct vga_switcheroo_client *active;
Dave Airlie66b37c62010-12-07 14:24:25 +1000640
Takashi Iwai79721e02012-04-26 12:55:59 +0200641 active = find_active_client(&vgasr_priv.clients);
Dave Airlie66b37c62010-12-07 14:24:25 +1000642 if (!active)
643 return 0;
644
645 active->active = false;
Dave Airlie6a9ee8a2010-02-01 15:38:10 +1000646
Takashi Iwaic91c3fa2012-06-09 08:46:42 +0200647 set_audio_state(active->id, VGA_SWITCHEROO_OFF);
648
Dave Airlie6a9ee8a2010-02-01 15:38:10 +1000649 if (new_client->fb_info) {
650 struct fb_event event;
Thierry Reding7491bfb2015-08-12 16:32:11 +0200651
Dave Airlie054430e2013-01-25 11:38:56 +1000652 console_lock();
Dave Airlie6a9ee8a2010-02-01 15:38:10 +1000653 event.info = new_client->fb_info;
654 fb_notifier_call_chain(FB_EVENT_REMAP_ALL_CONSOLE, &event);
Dave Airlie054430e2013-01-25 11:38:56 +1000655 console_unlock();
Dave Airlie6a9ee8a2010-02-01 15:38:10 +1000656 }
657
Lukas Wunnere4cb81d2016-01-11 20:09:20 +0100658 mutex_lock(&vgasr_priv.mux_hw_lock);
Dave Airlie6a9ee8a2010-02-01 15:38:10 +1000659 ret = vgasr_priv.handler->switchto(new_client->id);
Lukas Wunnere4cb81d2016-01-11 20:09:20 +0100660 mutex_unlock(&vgasr_priv.mux_hw_lock);
Dave Airlie6a9ee8a2010-02-01 15:38:10 +1000661 if (ret)
662 return ret;
663
Takashi Iwai26ec6852012-05-11 07:51:17 +0200664 if (new_client->ops->reprobe)
665 new_client->ops->reprobe(new_client->pdev);
Dave Airlie8d608aa2010-12-07 08:57:57 +1000666
Dave Airlie6a9ee8a2010-02-01 15:38:10 +1000667 if (active->pwr_state == VGA_SWITCHEROO_ON)
668 vga_switchoff(active);
669
Takashi Iwaic91c3fa2012-06-09 08:46:42 +0200670 set_audio_state(new_client->id, VGA_SWITCHEROO_ON);
671
Dave Airlie6a9ee8a2010-02-01 15:38:10 +1000672 new_client->active = true;
673 return 0;
674}
675
Takashi Iwai79721e02012-04-26 12:55:59 +0200676static bool check_can_switch(void)
677{
678 struct vga_switcheroo_client *client;
679
680 list_for_each_entry(client, &vgasr_priv.clients, list) {
Takashi Iwai26ec6852012-05-11 07:51:17 +0200681 if (!client->ops->can_switch(client->pdev)) {
Thierry Reding9b0be1e2015-08-12 16:32:10 +0200682 pr_err("client %x refused switch\n", client->id);
Takashi Iwai79721e02012-04-26 12:55:59 +0200683 return false;
684 }
685 }
686 return true;
687}
688
Dave Airlie6a9ee8a2010-02-01 15:38:10 +1000689static ssize_t
690vga_switcheroo_debugfs_write(struct file *filp, const char __user *ubuf,
691 size_t cnt, loff_t *ppos)
692{
693 char usercmd[64];
Takashi Iwai79721e02012-04-26 12:55:59 +0200694 int ret;
Dave Airlie6a9ee8a2010-02-01 15:38:10 +1000695 bool delay = false, can_switch;
Dave Airlie851ab952010-12-06 12:35:52 +1000696 bool just_mux = false;
Lukas Wunnerfa3e9672015-08-28 12:54:07 +0200697 enum vga_switcheroo_client_id client_id = VGA_SWITCHEROO_UNKNOWN_ID;
Dave Airlie6a9ee8a2010-02-01 15:38:10 +1000698 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
Jiri Slaby8c88e502010-04-27 14:11:03 -0700708 if (!vgasr_priv.active) {
709 cnt = -EINVAL;
710 goto out;
711 }
Dave Airlie6a9ee8a2010-02-01 15:38:10 +1000712
713 /* pwr off the device not in use */
714 if (strncmp(usercmd, "OFF", 3) == 0) {
Takashi Iwai79721e02012-04-26 12:55:59 +0200715 list_for_each_entry(client, &vgasr_priv.clients, list) {
Takashi Iwaic91c3fa2012-06-09 08:46:42 +0200716 if (client->active || client_is_audio(client))
Dave Airlie6a9ee8a2010-02-01 15:38:10 +1000717 continue;
Dave Airlie0d697042012-09-10 12:28:36 +1000718 if (client->driver_power_control)
719 continue;
Takashi Iwaic91c3fa2012-06-09 08:46:42 +0200720 set_audio_state(client->id, VGA_SWITCHEROO_OFF);
Takashi Iwai79721e02012-04-26 12:55:59 +0200721 if (client->pwr_state == VGA_SWITCHEROO_ON)
722 vga_switchoff(client);
Dave Airlie6a9ee8a2010-02-01 15:38:10 +1000723 }
724 goto out;
725 }
726 /* pwr on the device not in use */
727 if (strncmp(usercmd, "ON", 2) == 0) {
Takashi Iwai79721e02012-04-26 12:55:59 +0200728 list_for_each_entry(client, &vgasr_priv.clients, list) {
Takashi Iwaic91c3fa2012-06-09 08:46:42 +0200729 if (client->active || client_is_audio(client))
Dave Airlie6a9ee8a2010-02-01 15:38:10 +1000730 continue;
Dave Airlie0d697042012-09-10 12:28:36 +1000731 if (client->driver_power_control)
732 continue;
Takashi Iwai79721e02012-04-26 12:55:59 +0200733 if (client->pwr_state == VGA_SWITCHEROO_OFF)
734 vga_switchon(client);
Takashi Iwaic91c3fa2012-06-09 08:46:42 +0200735 set_audio_state(client->id, VGA_SWITCHEROO_ON);
Dave Airlie6a9ee8a2010-02-01 15:38:10 +1000736 }
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
Dan Carpenterfea6f332011-01-07 08:12:27 +0300757 if (strncmp(usercmd, "MIGD", 4) == 0) {
Dave Airlie851ab952010-12-06 12:35:52 +1000758 just_mux = true;
759 client_id = VGA_SWITCHEROO_IGD;
760 }
Dan Carpenterfea6f332011-01-07 08:12:27 +0300761 if (strncmp(usercmd, "MDIS", 4) == 0) {
Dave Airlie851ab952010-12-06 12:35:52 +1000762 just_mux = true;
763 client_id = VGA_SWITCHEROO_DIS;
764 }
765
Lukas Wunner21c5ba82015-08-28 13:30:32 +0200766 if (client_id == VGA_SWITCHEROO_UNKNOWN_ID)
Dave Airlie6a9ee8a2010-02-01 15:38:10 +1000767 goto out;
Takashi Iwai79721e02012-04-26 12:55:59 +0200768 client = find_client_from_id(&vgasr_priv.clients, client_id);
769 if (!client)
770 goto out;
Dave Airlie6a9ee8a2010-02-01 15:38:10 +1000771
772 vgasr_priv.delayed_switch_active = false;
Dave Airlie851ab952010-12-06 12:35:52 +1000773
774 if (just_mux) {
Lukas Wunnere4cb81d2016-01-11 20:09:20 +0100775 mutex_lock(&vgasr_priv.mux_hw_lock);
Dave Airlie851ab952010-12-06 12:35:52 +1000776 ret = vgasr_priv.handler->switchto(client_id);
Lukas Wunnere4cb81d2016-01-11 20:09:20 +0100777 mutex_unlock(&vgasr_priv.mux_hw_lock);
Dave Airlie851ab952010-12-06 12:35:52 +1000778 goto out;
779 }
780
Takashi Iwai79721e02012-04-26 12:55:59 +0200781 if (client->active)
Florian Micklera67b8882011-05-15 16:32:50 +0200782 goto out;
783
Dave Airlie6a9ee8a2010-02-01 15:38:10 +1000784 /* okay we want a switch - test if devices are willing to switch */
Takashi Iwai79721e02012-04-26 12:55:59 +0200785 can_switch = check_can_switch();
Dave Airlie6a9ee8a2010-02-01 15:38:10 +1000786
787 if (can_switch == false && delay == false)
788 goto out;
789
Takashi Iwai79721e02012-04-26 12:55:59 +0200790 if (can_switch) {
Dave Airlie66b37c62010-12-07 14:24:25 +1000791 ret = vga_switchto_stage1(client);
Dave Airlie6a9ee8a2010-02-01 15:38:10 +1000792 if (ret)
Thierry Reding9b0be1e2015-08-12 16:32:10 +0200793 pr_err("switching failed stage 1 %d\n", ret);
Dave Airlie66b37c62010-12-07 14:24:25 +1000794
795 ret = vga_switchto_stage2(client);
796 if (ret)
Thierry Reding9b0be1e2015-08-12 16:32:10 +0200797 pr_err("switching failed stage 2 %d\n", ret);
Dave Airlie66b37c62010-12-07 14:24:25 +1000798
Dave Airlie6a9ee8a2010-02-01 15:38:10 +1000799 } else {
Thierry Reding9b0be1e2015-08-12 16:32:10 +0200800 pr_info("setting delayed switch to client %d\n", client->id);
Dave Airlie6a9ee8a2010-02-01 15:38:10 +1000801 vgasr_priv.delayed_switch_active = true;
802 vgasr_priv.delayed_client_id = client_id;
803
Dave Airlie66b37c62010-12-07 14:24:25 +1000804 ret = vga_switchto_stage1(client);
805 if (ret)
Thierry Reding9b0be1e2015-08-12 16:32:10 +0200806 pr_err("delayed switching stage 1 failed %d\n", ret);
Dave Airlie6a9ee8a2010-02-01 15:38:10 +1000807 }
808
809out:
810 mutex_unlock(&vgasr_mutex);
811 return cnt;
812}
813
814static 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
823static void vga_switcheroo_debugfs_fini(struct vgasr_priv *priv)
824{
Thierry Reding798ae0f2015-08-12 16:32:12 +0200825 debugfs_remove(priv->switch_file);
826 priv->switch_file = NULL;
827
828 debugfs_remove(priv->debugfs_root);
829 priv->debugfs_root = NULL;
Dave Airlie6a9ee8a2010-02-01 15:38:10 +1000830}
831
832static int vga_switcheroo_debugfs_init(struct vgasr_priv *priv)
833{
Thierry Reding9b0be1e2015-08-12 16:32:10 +0200834 static const char mp[] = "/sys/kernel/debug";
835
Dave Airlie6a9ee8a2010-02-01 15:38:10 +1000836 /* 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) {
Thierry Reding9b0be1e2015-08-12 16:32:10 +0200842 pr_err("Cannot create %s/vgaswitcheroo\n", mp);
Dave Airlie6a9ee8a2010-02-01 15:38:10 +1000843 goto fail;
844 }
845
846 priv->switch_file = debugfs_create_file("switch", 0644,
Thierry Reding7491bfb2015-08-12 16:32:11 +0200847 priv->debugfs_root, NULL,
848 &vga_switcheroo_debugfs_fops);
Dave Airlie6a9ee8a2010-02-01 15:38:10 +1000849 if (!priv->switch_file) {
Thierry Reding9b0be1e2015-08-12 16:32:10 +0200850 pr_err("cannot create %s/vgaswitcheroo/switch\n", mp);
Dave Airlie6a9ee8a2010-02-01 15:38:10 +1000851 goto fail;
852 }
853 return 0;
854fail:
855 vga_switcheroo_debugfs_fini(priv);
856 return -1;
857}
858
Lukas Wunnera6456542015-08-23 15:18:55 +0200859/**
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 */
Dave Airlie6a9ee8a2010-02-01 15:38:10 +1000869int vga_switcheroo_process_delayed_switch(void)
870{
Takashi Iwai79721e02012-04-26 12:55:59 +0200871 struct vga_switcheroo_client *client;
Dave Airlie6a9ee8a2010-02-01 15:38:10 +1000872 int ret;
873 int err = -EINVAL;
874
875 mutex_lock(&vgasr_mutex);
876 if (!vgasr_priv.delayed_switch_active)
877 goto err;
878
Thierry Reding9b0be1e2015-08-12 16:32:10 +0200879 pr_info("processing delayed switch to %d\n",
880 vgasr_priv.delayed_client_id);
Dave Airlie6a9ee8a2010-02-01 15:38:10 +1000881
Takashi Iwai79721e02012-04-26 12:55:59 +0200882 client = find_client_from_id(&vgasr_priv.clients,
883 vgasr_priv.delayed_client_id);
884 if (!client || !check_can_switch())
Dave Airlie6a9ee8a2010-02-01 15:38:10 +1000885 goto err;
886
Dave Airlie66b37c62010-12-07 14:24:25 +1000887 ret = vga_switchto_stage2(client);
Dave Airlie6a9ee8a2010-02-01 15:38:10 +1000888 if (ret)
Thierry Reding9b0be1e2015-08-12 16:32:10 +0200889 pr_err("delayed switching failed stage 2 %d\n", ret);
Dave Airlie6a9ee8a2010-02-01 15:38:10 +1000890
891 vgasr_priv.delayed_switch_active = false;
892 err = 0;
893err:
894 mutex_unlock(&vgasr_mutex);
895 return err;
896}
897EXPORT_SYMBOL(vga_switcheroo_process_delayed_switch);
Dave Airlie0d697042012-09-10 12:28:36 +1000898
Lukas Wunnera6456542015-08-23 15:18:55 +0200899/**
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
Thierry Reding7491bfb2015-08-12 16:32:11 +0200932static void vga_switcheroo_power_switch(struct pci_dev *pdev,
933 enum vga_switcheroo_state state)
Dave Airlie0d697042012-09-10 12:28:36 +1000934{
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
Lukas Wunnera6456542015-08-23 15:18:55 +0200950/**
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 */
Thierry Reding7491bfb2015-08-12 16:32:11 +0200961void vga_switcheroo_set_dynamic_switch(struct pci_dev *pdev,
962 enum vga_switcheroo_state dynamic)
Dave Airlie0d697042012-09-10 12:28:36 +1000963{
964 struct vga_switcheroo_client *client;
965
Lukas Wunner8f12a312015-08-23 23:23:02 +0200966 mutex_lock(&vgasr_mutex);
Dave Airlie0d697042012-09-10 12:28:36 +1000967 client = find_client_from_pci(&vgasr_priv.clients, pdev);
Lukas Wunner8f12a312015-08-23 23:23:02 +0200968 if (!client || !client->driver_power_control) {
969 mutex_unlock(&vgasr_mutex);
Dave Airlie0d697042012-09-10 12:28:36 +1000970 return;
Lukas Wunner8f12a312015-08-23 23:23:02 +0200971 }
Dave Airlie0d697042012-09-10 12:28:36 +1000972
973 client->pwr_state = dynamic;
974 set_audio_state(client->id, dynamic);
Lukas Wunner8f12a312015-08-23 23:23:02 +0200975 mutex_unlock(&vgasr_mutex);
Dave Airlie0d697042012-09-10 12:28:36 +1000976}
977EXPORT_SYMBOL(vga_switcheroo_set_dynamic_switch);
978
979/* switcheroo power domain */
980static 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;
Lukas Wunner8f12a312015-08-23 23:23:02 +0200988 mutex_lock(&vgasr_mutex);
Lukas Wunnere4cb81d2016-01-11 20:09:20 +0100989 if (vgasr_priv.handler->switchto) {
990 mutex_lock(&vgasr_priv.mux_hw_lock);
Alex Deucherf2bc561612014-05-19 14:04:43 -0400991 vgasr_priv.handler->switchto(VGA_SWITCHEROO_IGD);
Lukas Wunnere4cb81d2016-01-11 20:09:20 +0100992 mutex_unlock(&vgasr_priv.mux_hw_lock);
993 }
Dave Airlie0d697042012-09-10 12:28:36 +1000994 vga_switcheroo_power_switch(pdev, VGA_SWITCHEROO_OFF);
Lukas Wunner8f12a312015-08-23 23:23:02 +0200995 mutex_unlock(&vgasr_mutex);
Dave Airlie0d697042012-09-10 12:28:36 +1000996 return 0;
997}
998
999static int vga_switcheroo_runtime_resume(struct device *dev)
1000{
1001 struct pci_dev *pdev = to_pci_dev(dev);
1002 int ret;
1003
Lukas Wunner8f12a312015-08-23 23:23:02 +02001004 mutex_lock(&vgasr_mutex);
Dave Airlie0d697042012-09-10 12:28:36 +10001005 vga_switcheroo_power_switch(pdev, VGA_SWITCHEROO_ON);
Lukas Wunner8f12a312015-08-23 23:23:02 +02001006 mutex_unlock(&vgasr_mutex);
Dave Airlie0d697042012-09-10 12:28:36 +10001007 ret = dev->bus->pm->runtime_resume(dev);
1008 if (ret)
1009 return ret;
1010
1011 return 0;
1012}
1013
Lukas Wunnera6456542015-08-23 15:18:55 +02001014/**
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 */
Thierry Reding7491bfb2015-08-12 16:32:11 +02001026int vga_switcheroo_init_domain_pm_ops(struct device *dev,
1027 struct dev_pm_domain *domain)
Dave Airlie0d697042012-09-10 12:28:36 +10001028{
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
Tomeu Vizoso989561d2016-01-07 16:46:13 +01001035 dev_pm_domain_set(dev, domain);
Dave Airlie0d697042012-09-10 12:28:36 +10001036 return 0;
1037 }
Tomeu Vizoso989561d2016-01-07 16:46:13 +01001038 dev_pm_domain_set(dev, NULL);
Dave Airlie0d697042012-09-10 12:28:36 +10001039 return -EINVAL;
1040}
1041EXPORT_SYMBOL(vga_switcheroo_init_domain_pm_ops);
1042
Alex Deucher766a53d2014-09-12 17:51:29 -04001043void vga_switcheroo_fini_domain_pm_ops(struct device *dev)
1044{
Tomeu Vizoso989561d2016-01-07 16:46:13 +01001045 dev_pm_domain_set(dev, NULL);
Alex Deucher766a53d2014-09-12 17:51:29 -04001046}
1047EXPORT_SYMBOL(vga_switcheroo_fini_domain_pm_ops);
1048
Dave Airlie0d697042012-09-10 12:28:36 +10001049static int vga_switcheroo_runtime_resume_hdmi_audio(struct device *dev)
1050{
1051 struct pci_dev *pdev = to_pci_dev(dev);
Lukas Wunner8f12a312015-08-23 23:23:02 +02001052 struct vga_switcheroo_client *client;
1053 struct device *video_dev = NULL;
Dave Airlie0d697042012-09-10 12:28:36 +10001054 int ret;
Dave Airlie0d697042012-09-10 12:28:36 +10001055
1056 /* we need to check if we have to switch back on the video
1057 device so the audio device can come back */
Lukas Wunner8f12a312015-08-23 23:23:02 +02001058 mutex_lock(&vgasr_mutex);
Dave Airlie0d697042012-09-10 12:28:36 +10001059 list_for_each_entry(client, &vgasr_priv.clients, list) {
Thierry Reding7491bfb2015-08-12 16:32:11 +02001060 if (PCI_SLOT(client->pdev->devfn) == PCI_SLOT(pdev->devfn) &&
1061 client_is_vga(client)) {
Lukas Wunner8f12a312015-08-23 23:23:02 +02001062 video_dev = &client->pdev->dev;
Dave Airlie0d697042012-09-10 12:28:36 +10001063 break;
1064 }
1065 }
Lukas Wunner8f12a312015-08-23 23:23:02 +02001066 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 }
Dave Airlie0d697042012-09-10 12:28:36 +10001073 ret = dev->bus->pm->runtime_resume(dev);
1074
1075 /* put the reference for the gpu */
Lukas Wunner8f12a312015-08-23 23:23:02 +02001076 if (video_dev) {
1077 pm_runtime_mark_last_busy(video_dev);
1078 pm_runtime_put_autosuspend(video_dev);
Dave Airlie0d697042012-09-10 12:28:36 +10001079 }
1080 return ret;
1081}
1082
Lukas Wunnera6456542015-08-23 15:18:55 +02001083/**
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 */
Thierry Reding7491bfb2015-08-12 16:32:11 +02001096int
1097vga_switcheroo_init_domain_pm_optimus_hdmi_audio(struct device *dev,
1098 struct dev_pm_domain *domain)
Dave Airlie0d697042012-09-10 12:28:36 +10001099{
1100 /* copy over all the bus versions */
1101 if (dev->bus && dev->bus->pm) {
1102 domain->ops = *dev->bus->pm;
Thierry Reding7491bfb2015-08-12 16:32:11 +02001103 domain->ops.runtime_resume =
1104 vga_switcheroo_runtime_resume_hdmi_audio;
Dave Airlie0d697042012-09-10 12:28:36 +10001105
Tomeu Vizoso989561d2016-01-07 16:46:13 +01001106 dev_pm_domain_set(dev, domain);
Dave Airlie0d697042012-09-10 12:28:36 +10001107 return 0;
1108 }
Tomeu Vizoso989561d2016-01-07 16:46:13 +01001109 dev_pm_domain_set(dev, NULL);
Dave Airlie0d697042012-09-10 12:28:36 +10001110 return -EINVAL;
1111}
1112EXPORT_SYMBOL(vga_switcheroo_init_domain_pm_optimus_hdmi_audio);