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authorJosé Pekkarinen <jose.pekkarinen@nokia.com>2016-04-11 10:41:07 +0300
committerJosé Pekkarinen <jose.pekkarinen@nokia.com>2016-04-13 08:17:18 +0300
commite09b41010ba33a20a87472ee821fa407a5b8da36 (patch)
treed10dc367189862e7ca5c592f033dc3726e1df4e3 /kernel/drivers/gpu/vga
parentf93b97fd65072de626c074dbe099a1fff05ce060 (diff)
These changes are the raw update to linux-4.4.6-rt14. Kernel sources
are taken from kernel.org, and rt patch from the rt wiki download page. During the rebasing, the following patch collided: Force tick interrupt and get rid of softirq magic(I70131fb85). Collisions have been removed because its logic was found on the source already. Change-Id: I7f57a4081d9deaa0d9ccfc41a6c8daccdee3b769 Signed-off-by: José Pekkarinen <jose.pekkarinen@nokia.com>
Diffstat (limited to 'kernel/drivers/gpu/vga')
-rw-r--r--kernel/drivers/gpu/vga/vga_switcheroo.c463
-rw-r--r--kernel/drivers/gpu/vga/vgaarb.c152
2 files changed, 462 insertions, 153 deletions
diff --git a/kernel/drivers/gpu/vga/vga_switcheroo.c b/kernel/drivers/gpu/vga/vga_switcheroo.c
index 37ac7b5db..41edd5a3f 100644
--- a/kernel/drivers/gpu/vga/vga_switcheroo.c
+++ b/kernel/drivers/gpu/vga/vga_switcheroo.c
@@ -1,51 +1,135 @@
/*
+ * vga_switcheroo.c - Support for laptop with dual GPU using one set of outputs
+ *
* Copyright (c) 2010 Red Hat Inc.
* Author : Dave Airlie <airlied@redhat.com>
*
+ * Copyright (c) 2015 Lukas Wunner <lukas@wunner.de>
*
- * Licensed under GPLv2
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS
+ * IN THE SOFTWARE.
*
- * vga_switcheroo.c - Support for laptop with dual GPU using one set of outputs
-
- Switcher interface - methods require for ATPX and DCM
- - switchto - this throws the output MUX switch
- - discrete_set_power - sets the power state for the discrete card
-
- GPU driver interface
- - set_gpu_state - this should do the equiv of s/r for the card
- - this should *not* set the discrete power state
- - switch_check - check if the device is in a position to switch now
*/
-#include <linux/module.h>
-#include <linux/seq_file.h>
-#include <linux/uaccess.h>
-#include <linux/fs.h>
+#define pr_fmt(fmt) "vga_switcheroo: " fmt
+
+#include <linux/console.h>
#include <linux/debugfs.h>
#include <linux/fb.h>
-
+#include <linux/fs.h>
+#include <linux/module.h>
#include <linux/pci.h>
-#include <linux/console.h>
-#include <linux/vga_switcheroo.h>
#include <linux/pm_runtime.h>
-
+#include <linux/seq_file.h>
+#include <linux/uaccess.h>
#include <linux/vgaarb.h>
+#include <linux/vga_switcheroo.h>
+
+/**
+ * DOC: Overview
+ *
+ * vga_switcheroo is the Linux subsystem for laptop hybrid graphics.
+ * These come in two flavors:
+ *
+ * * muxed: Dual GPUs with a multiplexer chip to switch outputs between GPUs.
+ * * muxless: Dual GPUs but only one of them is connected to outputs.
+ * The other one is merely used to offload rendering, its results
+ * are copied over PCIe into the framebuffer. On Linux this is
+ * supported with DRI PRIME.
+ *
+ * Hybrid graphics started to appear in the late Naughties and were initially
+ * all muxed. Newer laptops moved to a muxless architecture for cost reasons.
+ * A notable exception is the MacBook Pro which continues to use a mux.
+ * Muxes come with varying capabilities: Some switch only the panel, others
+ * can also switch external displays. Some switch all display pins at once
+ * while others can switch just the DDC lines. (To allow EDID probing
+ * for the inactive GPU.) Also, muxes are often used to cut power to the
+ * discrete GPU while it is not used.
+ *
+ * DRM drivers register GPUs with vga_switcheroo, these are heretoforth called
+ * clients. The mux is called the handler. Muxless machines also register a
+ * handler to control the power state of the discrete GPU, its ->switchto
+ * callback is a no-op for obvious reasons. The discrete GPU is often equipped
+ * with an HDA controller for the HDMI/DP audio signal, this will also
+ * register as a client so that vga_switcheroo can take care of the correct
+ * suspend/resume order when changing the discrete GPU's power state. In total
+ * there can thus be up to three clients: Two vga clients (GPUs) and one audio
+ * client (on the discrete GPU). The code is mostly prepared to support
+ * machines with more than two GPUs should they become available.
+ * The GPU to which the outputs are currently switched is called the
+ * active client in vga_switcheroo parlance. The GPU not in use is the
+ * inactive client.
+ */
+/**
+ * struct vga_switcheroo_client - registered client
+ * @pdev: client pci device
+ * @fb_info: framebuffer to which console is remapped on switching
+ * @pwr_state: current power state
+ * @ops: client callbacks
+ * @id: client identifier. Determining the id requires the handler,
+ * so gpus are initially assigned VGA_SWITCHEROO_UNKNOWN_ID
+ * and later given their true id in vga_switcheroo_enable()
+ * @active: whether the outputs are currently switched to this client
+ * @driver_power_control: whether power state is controlled by the driver's
+ * runtime pm. If true, writing ON and OFF to the vga_switcheroo debugfs
+ * interface is a no-op so as not to interfere with runtime pm
+ * @list: client list
+ *
+ * Registered client. A client can be either a GPU or an audio device on a GPU.
+ * For audio clients, the @fb_info, @active and @driver_power_control members
+ * are bogus.
+ */
struct vga_switcheroo_client {
struct pci_dev *pdev;
struct fb_info *fb_info;
- int pwr_state;
+ enum vga_switcheroo_state pwr_state;
const struct vga_switcheroo_client_ops *ops;
- int id;
+ enum vga_switcheroo_client_id id;
bool active;
bool driver_power_control;
struct list_head list;
};
+/*
+ * protects access to struct vgasr_priv
+ */
static DEFINE_MUTEX(vgasr_mutex);
+/**
+ * struct vgasr_priv - vga_switcheroo private data
+ * @active: whether vga_switcheroo is enabled.
+ * Prerequisite is the registration of two GPUs and a handler
+ * @delayed_switch_active: whether a delayed switch is pending
+ * @delayed_client_id: client to which a delayed switch is pending
+ * @debugfs_root: directory for vga_switcheroo debugfs interface
+ * @switch_file: file for vga_switcheroo debugfs interface
+ * @registered_clients: number of registered GPUs
+ * (counting only vga clients, not audio clients)
+ * @clients: list of registered clients
+ * @handler: registered handler
+ *
+ * vga_switcheroo private data. Currently only one vga_switcheroo instance
+ * per system is supported.
+ */
struct vgasr_priv {
-
bool active;
bool delayed_switch_active;
enum vga_switcheroo_client_id delayed_client_id;
@@ -56,12 +140,13 @@ struct vgasr_priv {
int registered_clients;
struct list_head clients;
- struct vga_switcheroo_handler *handler;
+ const struct vga_switcheroo_handler *handler;
};
#define ID_BIT_AUDIO 0x100
#define client_is_audio(c) ((c)->id & ID_BIT_AUDIO)
-#define client_is_vga(c) ((c)->id == -1 || !client_is_audio(c))
+#define client_is_vga(c) ((c)->id == VGA_SWITCHEROO_UNKNOWN_ID || \
+ !client_is_audio(c))
#define client_id(c) ((c)->id & ~ID_BIT_AUDIO)
static int vga_switcheroo_debugfs_init(struct vgasr_priv *priv);
@@ -89,7 +174,7 @@ static void vga_switcheroo_enable(void)
vgasr_priv.handler->init();
list_for_each_entry(client, &vgasr_priv.clients, list) {
- if (client->id != -1)
+ if (client->id != VGA_SWITCHEROO_UNKNOWN_ID)
continue;
ret = vgasr_priv.handler->get_client_id(client->pdev);
if (ret < 0)
@@ -101,7 +186,16 @@ static void vga_switcheroo_enable(void)
vgasr_priv.active = true;
}
-int vga_switcheroo_register_handler(struct vga_switcheroo_handler *handler)
+/**
+ * vga_switcheroo_register_handler() - register handler
+ * @handler: handler callbacks
+ *
+ * Register handler. Enable vga_switcheroo if two vga clients have already
+ * registered.
+ *
+ * Return: 0 on success, -EINVAL if a handler was already registered.
+ */
+int vga_switcheroo_register_handler(const struct vga_switcheroo_handler *handler)
{
mutex_lock(&vgasr_mutex);
if (vgasr_priv.handler) {
@@ -111,7 +205,7 @@ int vga_switcheroo_register_handler(struct vga_switcheroo_handler *handler)
vgasr_priv.handler = handler;
if (vga_switcheroo_ready()) {
- printk(KERN_INFO "vga_switcheroo: enabled\n");
+ pr_info("enabled\n");
vga_switcheroo_enable();
}
mutex_unlock(&vgasr_mutex);
@@ -119,12 +213,17 @@ int vga_switcheroo_register_handler(struct vga_switcheroo_handler *handler)
}
EXPORT_SYMBOL(vga_switcheroo_register_handler);
+/**
+ * vga_switcheroo_unregister_handler() - unregister handler
+ *
+ * Unregister handler. Disable vga_switcheroo.
+ */
void vga_switcheroo_unregister_handler(void)
{
mutex_lock(&vgasr_mutex);
vgasr_priv.handler = NULL;
if (vgasr_priv.active) {
- pr_info("vga_switcheroo: disabled\n");
+ pr_info("disabled\n");
vga_switcheroo_debugfs_fini(&vgasr_priv);
vgasr_priv.active = false;
}
@@ -134,7 +233,8 @@ EXPORT_SYMBOL(vga_switcheroo_unregister_handler);
static int register_client(struct pci_dev *pdev,
const struct vga_switcheroo_client_ops *ops,
- int id, bool active, bool driver_power_control)
+ enum vga_switcheroo_client_id id, bool active,
+ bool driver_power_control)
{
struct vga_switcheroo_client *client;
@@ -155,27 +255,52 @@ static int register_client(struct pci_dev *pdev,
vgasr_priv.registered_clients++;
if (vga_switcheroo_ready()) {
- printk(KERN_INFO "vga_switcheroo: enabled\n");
+ pr_info("enabled\n");
vga_switcheroo_enable();
}
mutex_unlock(&vgasr_mutex);
return 0;
}
+/**
+ * vga_switcheroo_register_client - register vga client
+ * @pdev: client pci device
+ * @ops: client callbacks
+ * @driver_power_control: whether power state is controlled by the driver's
+ * runtime pm
+ *
+ * Register vga client (GPU). Enable vga_switcheroo if another GPU and a
+ * handler have already registered. The power state of the client is assumed
+ * to be ON.
+ *
+ * Return: 0 on success, -ENOMEM on memory allocation error.
+ */
int vga_switcheroo_register_client(struct pci_dev *pdev,
const struct vga_switcheroo_client_ops *ops,
bool driver_power_control)
{
- return register_client(pdev, ops, -1,
- pdev == vga_default_device(), driver_power_control);
+ return register_client(pdev, ops, VGA_SWITCHEROO_UNKNOWN_ID,
+ pdev == vga_default_device(),
+ driver_power_control);
}
EXPORT_SYMBOL(vga_switcheroo_register_client);
+/**
+ * vga_switcheroo_register_audio_client - register audio client
+ * @pdev: client pci device
+ * @ops: client callbacks
+ * @id: client identifier
+ *
+ * Register audio client (audio device on a GPU). The power state of the
+ * client is assumed to be ON.
+ *
+ * Return: 0 on success, -ENOMEM on memory allocation error.
+ */
int vga_switcheroo_register_audio_client(struct pci_dev *pdev,
const struct vga_switcheroo_client_ops *ops,
- int id, bool active)
+ enum vga_switcheroo_client_id id)
{
- return register_client(pdev, ops, id | ID_BIT_AUDIO, active, false);
+ return register_client(pdev, ops, id | ID_BIT_AUDIO, false, false);
}
EXPORT_SYMBOL(vga_switcheroo_register_audio_client);
@@ -183,6 +308,7 @@ static struct vga_switcheroo_client *
find_client_from_pci(struct list_head *head, struct pci_dev *pdev)
{
struct vga_switcheroo_client *client;
+
list_for_each_entry(client, head, list)
if (client->pdev == pdev)
return client;
@@ -190,9 +316,11 @@ find_client_from_pci(struct list_head *head, struct pci_dev *pdev)
}
static struct vga_switcheroo_client *
-find_client_from_id(struct list_head *head, int client_id)
+find_client_from_id(struct list_head *head,
+ enum vga_switcheroo_client_id client_id)
{
struct vga_switcheroo_client *client;
+
list_for_each_entry(client, head, list)
if (client->id == client_id)
return client;
@@ -203,25 +331,44 @@ static struct vga_switcheroo_client *
find_active_client(struct list_head *head)
{
struct vga_switcheroo_client *client;
+
list_for_each_entry(client, head, list)
- if (client->active && client_is_vga(client))
+ if (client->active)
return client;
return NULL;
}
-int vga_switcheroo_get_client_state(struct pci_dev *pdev)
+/**
+ * vga_switcheroo_get_client_state() - obtain power state of a given client
+ * @pdev: client pci device
+ *
+ * Obtain power state of a given client as seen from vga_switcheroo.
+ * The function is only called from hda_intel.c.
+ *
+ * Return: Power state.
+ */
+enum vga_switcheroo_state vga_switcheroo_get_client_state(struct pci_dev *pdev)
{
struct vga_switcheroo_client *client;
+ enum vga_switcheroo_state ret;
+ mutex_lock(&vgasr_mutex);
client = find_client_from_pci(&vgasr_priv.clients, pdev);
if (!client)
- return VGA_SWITCHEROO_NOT_FOUND;
- if (!vgasr_priv.active)
- return VGA_SWITCHEROO_INIT;
- return client->pwr_state;
+ ret = VGA_SWITCHEROO_NOT_FOUND;
+ else
+ ret = client->pwr_state;
+ mutex_unlock(&vgasr_mutex);
+ return ret;
}
EXPORT_SYMBOL(vga_switcheroo_get_client_state);
+/**
+ * vga_switcheroo_unregister_client() - unregister client
+ * @pdev: client pci device
+ *
+ * Unregister client. Disable vga_switcheroo if this is a vga client (GPU).
+ */
void vga_switcheroo_unregister_client(struct pci_dev *pdev)
{
struct vga_switcheroo_client *client;
@@ -235,7 +382,7 @@ void vga_switcheroo_unregister_client(struct pci_dev *pdev)
kfree(client);
}
if (vgasr_priv.active && vgasr_priv.registered_clients < 2) {
- printk(KERN_INFO "vga_switcheroo: disabled\n");
+ pr_info("disabled\n");
vga_switcheroo_debugfs_fini(&vgasr_priv);
vgasr_priv.active = false;
}
@@ -243,6 +390,14 @@ void vga_switcheroo_unregister_client(struct pci_dev *pdev)
}
EXPORT_SYMBOL(vga_switcheroo_unregister_client);
+/**
+ * vga_switcheroo_client_fb_set() - set framebuffer of a given client
+ * @pdev: client pci device
+ * @info: framebuffer
+ *
+ * Set framebuffer of a given client. The console will be remapped to this
+ * on switching.
+ */
void vga_switcheroo_client_fb_set(struct pci_dev *pdev,
struct fb_info *info)
{
@@ -256,14 +411,52 @@ void vga_switcheroo_client_fb_set(struct pci_dev *pdev,
}
EXPORT_SYMBOL(vga_switcheroo_client_fb_set);
+/**
+ * DOC: Manual switching and manual power control
+ *
+ * In this mode of use, the file /sys/kernel/debug/vgaswitcheroo/switch
+ * can be read to retrieve the current vga_switcheroo state and commands
+ * can be written to it to change the state. The file appears as soon as
+ * two GPU drivers and one handler have registered with vga_switcheroo.
+ * The following commands are understood:
+ *
+ * * OFF: Power off the device not in use.
+ * * ON: Power on the device not in use.
+ * * IGD: Switch to the integrated graphics device.
+ * Power on the integrated GPU if necessary, power off the discrete GPU.
+ * Prerequisite is that no user space processes (e.g. Xorg, alsactl)
+ * have opened device files of the GPUs or the audio client. If the
+ * switch fails, the user may invoke lsof(8) or fuser(1) on /dev/dri/
+ * and /dev/snd/controlC1 to identify processes blocking the switch.
+ * * DIS: Switch to the discrete graphics device.
+ * * DIGD: Delayed switch to the integrated graphics device.
+ * This will perform the switch once the last user space process has
+ * closed the device files of the GPUs and the audio client.
+ * * DDIS: Delayed switch to the discrete graphics device.
+ * * MIGD: Mux-only switch to the integrated graphics device.
+ * Does not remap console or change the power state of either gpu.
+ * If the integrated GPU is currently off, the screen will turn black.
+ * If it is on, the screen will show whatever happens to be in VRAM.
+ * Either way, the user has to blindly enter the command to switch back.
+ * * MDIS: Mux-only switch to the discrete graphics device.
+ *
+ * For GPUs whose power state is controlled by the driver's runtime pm,
+ * the ON and OFF commands are a no-op (see next section).
+ *
+ * For muxless machines, the IGD/DIS, DIGD/DDIS and MIGD/MDIS commands
+ * should not be used.
+ */
+
static int vga_switcheroo_show(struct seq_file *m, void *v)
{
struct vga_switcheroo_client *client;
int i = 0;
+
mutex_lock(&vgasr_mutex);
list_for_each_entry(client, &vgasr_priv.clients, list) {
seq_printf(m, "%d:%s%s:%c:%s%s:%s\n", i,
- client_id(client) == VGA_SWITCHEROO_DIS ? "DIS" : "IGD",
+ client_id(client) == VGA_SWITCHEROO_DIS ? "DIS" :
+ "IGD",
client_is_vga(client) ? "" : "-Audio",
client->active ? '+' : ' ',
client->driver_power_control ? "Dyn" : "",
@@ -304,7 +497,8 @@ static int vga_switchoff(struct vga_switcheroo_client *client)
return 0;
}
-static void set_audio_state(int id, int state)
+static void set_audio_state(enum vga_switcheroo_client_id id,
+ enum vga_switcheroo_state state)
{
struct vga_switcheroo_client *client;
@@ -347,6 +541,7 @@ static int vga_switchto_stage2(struct vga_switcheroo_client *new_client)
if (new_client->fb_info) {
struct fb_event event;
+
console_lock();
event.info = new_client->fb_info;
fb_notifier_call_chain(FB_EVENT_REMAP_ALL_CONSOLE, &event);
@@ -375,7 +570,7 @@ static bool check_can_switch(void)
list_for_each_entry(client, &vgasr_priv.clients, list) {
if (!client->ops->can_switch(client->pdev)) {
- printk(KERN_ERR "vga_switcheroo: client %x refused switch\n", client->id);
+ pr_err("client %x refused switch\n", client->id);
return false;
}
}
@@ -390,7 +585,7 @@ vga_switcheroo_debugfs_write(struct file *filp, const char __user *ubuf,
int ret;
bool delay = false, can_switch;
bool just_mux = false;
- int client_id = -1;
+ enum vga_switcheroo_client_id client_id = VGA_SWITCHEROO_UNKNOWN_ID;
struct vga_switcheroo_client *client = NULL;
if (cnt > 63)
@@ -459,7 +654,7 @@ vga_switcheroo_debugfs_write(struct file *filp, const char __user *ubuf,
client_id = VGA_SWITCHEROO_DIS;
}
- if (client_id == -1)
+ if (client_id == VGA_SWITCHEROO_UNKNOWN_ID)
goto out;
client = find_client_from_id(&vgasr_priv.clients, client_id);
if (!client)
@@ -484,20 +679,20 @@ vga_switcheroo_debugfs_write(struct file *filp, const char __user *ubuf,
if (can_switch) {
ret = vga_switchto_stage1(client);
if (ret)
- printk(KERN_ERR "vga_switcheroo: switching failed stage 1 %d\n", ret);
+ pr_err("switching failed stage 1 %d\n", ret);
ret = vga_switchto_stage2(client);
if (ret)
- printk(KERN_ERR "vga_switcheroo: switching failed stage 2 %d\n", ret);
+ pr_err("switching failed stage 2 %d\n", ret);
} else {
- printk(KERN_INFO "vga_switcheroo: setting delayed switch to client %d\n", client->id);
+ pr_info("setting delayed switch to client %d\n", client->id);
vgasr_priv.delayed_switch_active = true;
vgasr_priv.delayed_client_id = client_id;
ret = vga_switchto_stage1(client);
if (ret)
- printk(KERN_ERR "vga_switcheroo: delayed switching stage 1 failed %d\n", ret);
+ pr_err("delayed switching stage 1 failed %d\n", ret);
}
out:
@@ -516,32 +711,32 @@ static const struct file_operations vga_switcheroo_debugfs_fops = {
static void vga_switcheroo_debugfs_fini(struct vgasr_priv *priv)
{
- if (priv->switch_file) {
- debugfs_remove(priv->switch_file);
- priv->switch_file = NULL;
- }
- if (priv->debugfs_root) {
- debugfs_remove(priv->debugfs_root);
- priv->debugfs_root = NULL;
- }
+ debugfs_remove(priv->switch_file);
+ priv->switch_file = NULL;
+
+ debugfs_remove(priv->debugfs_root);
+ priv->debugfs_root = NULL;
}
static int vga_switcheroo_debugfs_init(struct vgasr_priv *priv)
{
+ static const char mp[] = "/sys/kernel/debug";
+
/* already initialised */
if (priv->debugfs_root)
return 0;
priv->debugfs_root = debugfs_create_dir("vgaswitcheroo", NULL);
if (!priv->debugfs_root) {
- printk(KERN_ERR "vga_switcheroo: Cannot create /sys/kernel/debug/vgaswitcheroo\n");
+ pr_err("Cannot create %s/vgaswitcheroo\n", mp);
goto fail;
}
priv->switch_file = debugfs_create_file("switch", 0644,
- priv->debugfs_root, NULL, &vga_switcheroo_debugfs_fops);
+ priv->debugfs_root, NULL,
+ &vga_switcheroo_debugfs_fops);
if (!priv->switch_file) {
- printk(KERN_ERR "vga_switcheroo: cannot create /sys/kernel/debug/vgaswitcheroo/switch\n");
+ pr_err("cannot create %s/vgaswitcheroo/switch\n", mp);
goto fail;
}
return 0;
@@ -550,6 +745,16 @@ fail:
return -1;
}
+/**
+ * vga_switcheroo_process_delayed_switch() - helper for delayed switching
+ *
+ * Process a delayed switch if one is pending. DRM drivers should call this
+ * from their ->lastclose callback.
+ *
+ * Return: 0 on success. -EINVAL if no delayed switch is pending, if the client
+ * has unregistered in the meantime or if there are other clients blocking the
+ * switch. If the actual switch fails, an error is reported and 0 is returned.
+ */
int vga_switcheroo_process_delayed_switch(void)
{
struct vga_switcheroo_client *client;
@@ -560,7 +765,8 @@ int vga_switcheroo_process_delayed_switch(void)
if (!vgasr_priv.delayed_switch_active)
goto err;
- printk(KERN_INFO "vga_switcheroo: processing delayed switch to %d\n", vgasr_priv.delayed_client_id);
+ pr_info("processing delayed switch to %d\n",
+ vgasr_priv.delayed_client_id);
client = find_client_from_id(&vgasr_priv.clients,
vgasr_priv.delayed_client_id);
@@ -569,7 +775,7 @@ int vga_switcheroo_process_delayed_switch(void)
ret = vga_switchto_stage2(client);
if (ret)
- printk(KERN_ERR "vga_switcheroo: delayed switching failed stage 2 %d\n", ret);
+ pr_err("delayed switching failed stage 2 %d\n", ret);
vgasr_priv.delayed_switch_active = false;
err = 0;
@@ -579,7 +785,41 @@ err:
}
EXPORT_SYMBOL(vga_switcheroo_process_delayed_switch);
-static void vga_switcheroo_power_switch(struct pci_dev *pdev, enum vga_switcheroo_state state)
+/**
+ * DOC: Driver power control
+ *
+ * In this mode of use, the discrete GPU automatically powers up and down at
+ * the discretion of the driver's runtime pm. On muxed machines, the user may
+ * still influence the muxer state by way of the debugfs interface, however
+ * the ON and OFF commands become a no-op for the discrete GPU.
+ *
+ * This mode is the default on Nvidia HybridPower/Optimus and ATI PowerXpress.
+ * Specifying nouveau.runpm=0, radeon.runpm=0 or amdgpu.runpm=0 on the kernel
+ * command line disables it.
+ *
+ * When the driver decides to power up or down, it notifies vga_switcheroo
+ * thereof so that it can (a) power the audio device on the GPU up or down,
+ * and (b) update its internal power state representation for the device.
+ * This is achieved by vga_switcheroo_set_dynamic_switch().
+ *
+ * After the GPU has been suspended, the handler needs to be called to cut
+ * power to the GPU. Likewise it needs to reinstate power before the GPU
+ * can resume. This is achieved by vga_switcheroo_init_domain_pm_ops(),
+ * which augments the GPU's suspend/resume functions by the requisite
+ * calls to the handler.
+ *
+ * When the audio device resumes, the GPU needs to be woken. This is achieved
+ * by vga_switcheroo_init_domain_pm_optimus_hdmi_audio(), which augments the
+ * audio device's resume function.
+ *
+ * On muxed machines, if the mux is initially switched to the discrete GPU,
+ * the user ends up with a black screen when the GPU powers down after boot.
+ * As a workaround, the mux is forced to the integrated GPU on runtime suspend,
+ * cf. https://bugs.freedesktop.org/show_bug.cgi?id=75917
+ */
+
+static void vga_switcheroo_power_switch(struct pci_dev *pdev,
+ enum vga_switcheroo_state state)
{
struct vga_switcheroo_client *client;
@@ -596,21 +836,32 @@ static void vga_switcheroo_power_switch(struct pci_dev *pdev, enum vga_switchero
vgasr_priv.handler->power_state(client->id, state);
}
-/* force a PCI device to a certain state - mainly to turn off audio clients */
-
-void vga_switcheroo_set_dynamic_switch(struct pci_dev *pdev, enum vga_switcheroo_state dynamic)
+/**
+ * vga_switcheroo_set_dynamic_switch() - helper for driver power control
+ * @pdev: client pci device
+ * @dynamic: new power state
+ *
+ * Helper for GPUs whose power state is controlled by the driver's runtime pm.
+ * When the driver decides to power up or down, it notifies vga_switcheroo
+ * thereof using this helper so that it can (a) power the audio device on
+ * the GPU up or down, and (b) update its internal power state representation
+ * for the device.
+ */
+void vga_switcheroo_set_dynamic_switch(struct pci_dev *pdev,
+ enum vga_switcheroo_state dynamic)
{
struct vga_switcheroo_client *client;
+ mutex_lock(&vgasr_mutex);
client = find_client_from_pci(&vgasr_priv.clients, pdev);
- if (!client)
- return;
-
- if (!client->driver_power_control)
+ if (!client || !client->driver_power_control) {
+ mutex_unlock(&vgasr_mutex);
return;
+ }
client->pwr_state = dynamic;
set_audio_state(client->id, dynamic);
+ mutex_unlock(&vgasr_mutex);
}
EXPORT_SYMBOL(vga_switcheroo_set_dynamic_switch);
@@ -623,9 +874,11 @@ static int vga_switcheroo_runtime_suspend(struct device *dev)
ret = dev->bus->pm->runtime_suspend(dev);
if (ret)
return ret;
+ mutex_lock(&vgasr_mutex);
if (vgasr_priv.handler->switchto)
vgasr_priv.handler->switchto(VGA_SWITCHEROO_IGD);
vga_switcheroo_power_switch(pdev, VGA_SWITCHEROO_OFF);
+ mutex_unlock(&vgasr_mutex);
return 0;
}
@@ -634,7 +887,9 @@ static int vga_switcheroo_runtime_resume(struct device *dev)
struct pci_dev *pdev = to_pci_dev(dev);
int ret;
+ mutex_lock(&vgasr_mutex);
vga_switcheroo_power_switch(pdev, VGA_SWITCHEROO_ON);
+ mutex_unlock(&vgasr_mutex);
ret = dev->bus->pm->runtime_resume(dev);
if (ret)
return ret;
@@ -642,9 +897,20 @@ static int vga_switcheroo_runtime_resume(struct device *dev)
return 0;
}
-/* this version is for the case where the power switch is separate
- to the device being powered down. */
-int vga_switcheroo_init_domain_pm_ops(struct device *dev, struct dev_pm_domain *domain)
+/**
+ * vga_switcheroo_init_domain_pm_ops() - helper for driver power control
+ * @dev: vga client device
+ * @domain: power domain
+ *
+ * Helper for GPUs whose power state is controlled by the driver's runtime pm.
+ * After the GPU has been suspended, the handler needs to be called to cut
+ * power to the GPU. Likewise it needs to reinstate power before the GPU
+ * can resume. To this end, this helper augments the suspend/resume functions
+ * by the requisite calls to the handler. It needs only be called on platforms
+ * where the power switch is separate to the device being powered down.
+ */
+int vga_switcheroo_init_domain_pm_ops(struct device *dev,
+ struct dev_pm_domain *domain)
{
/* copy over all the bus versions */
if (dev->bus && dev->bus->pm) {
@@ -669,38 +935,59 @@ EXPORT_SYMBOL(vga_switcheroo_fini_domain_pm_ops);
static int vga_switcheroo_runtime_resume_hdmi_audio(struct device *dev)
{
struct pci_dev *pdev = to_pci_dev(dev);
+ struct vga_switcheroo_client *client;
+ struct device *video_dev = NULL;
int ret;
- struct vga_switcheroo_client *client, *found = NULL;
/* we need to check if we have to switch back on the video
device so the audio device can come back */
+ mutex_lock(&vgasr_mutex);
list_for_each_entry(client, &vgasr_priv.clients, list) {
- if (PCI_SLOT(client->pdev->devfn) == PCI_SLOT(pdev->devfn) && client_is_vga(client)) {
- found = client;
- ret = pm_runtime_get_sync(&client->pdev->dev);
- if (ret) {
- if (ret != 1)
- return ret;
- }
+ if (PCI_SLOT(client->pdev->devfn) == PCI_SLOT(pdev->devfn) &&
+ client_is_vga(client)) {
+ video_dev = &client->pdev->dev;
break;
}
}
+ mutex_unlock(&vgasr_mutex);
+
+ if (video_dev) {
+ ret = pm_runtime_get_sync(video_dev);
+ if (ret && ret != 1)
+ return ret;
+ }
ret = dev->bus->pm->runtime_resume(dev);
/* put the reference for the gpu */
- if (found) {
- pm_runtime_mark_last_busy(&found->pdev->dev);
- pm_runtime_put_autosuspend(&found->pdev->dev);
+ if (video_dev) {
+ pm_runtime_mark_last_busy(video_dev);
+ pm_runtime_put_autosuspend(video_dev);
}
return ret;
}
-int vga_switcheroo_init_domain_pm_optimus_hdmi_audio(struct device *dev, struct dev_pm_domain *domain)
+/**
+ * vga_switcheroo_init_domain_pm_optimus_hdmi_audio() - helper for driver
+ * power control
+ * @dev: audio client device
+ * @domain: power domain
+ *
+ * Helper for GPUs whose power state is controlled by the driver's runtime pm.
+ * When the audio device resumes, the GPU needs to be woken. This helper
+ * augments the audio device's resume function to do that.
+ *
+ * Return: 0 on success, -EINVAL if no power management operations are
+ * defined for this device.
+ */
+int
+vga_switcheroo_init_domain_pm_optimus_hdmi_audio(struct device *dev,
+ struct dev_pm_domain *domain)
{
/* copy over all the bus versions */
if (dev->bus && dev->bus->pm) {
domain->ops = *dev->bus->pm;
- domain->ops.runtime_resume = vga_switcheroo_runtime_resume_hdmi_audio;
+ domain->ops.runtime_resume =
+ vga_switcheroo_runtime_resume_hdmi_audio;
dev->pm_domain = domain;
return 0;
diff --git a/kernel/drivers/gpu/vga/vgaarb.c b/kernel/drivers/gpu/vga/vgaarb.c
index 7bcbf8636..9abcaa53b 100644
--- a/kernel/drivers/gpu/vga/vgaarb.c
+++ b/kernel/drivers/gpu/vga/vgaarb.c
@@ -29,6 +29,8 @@
*
*/
+#define pr_fmt(fmt) "vgaarb: " fmt
+
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/pci.h>
@@ -134,7 +136,6 @@ struct pci_dev *vga_default_device(void)
{
return vga_default;
}
-
EXPORT_SYMBOL_GPL(vga_default_device);
void vga_set_default_device(struct pci_dev *pdev)
@@ -298,9 +299,9 @@ enable_them:
pci_set_vga_state(vgadev->pdev, true, pci_bits, flags);
- if (!vgadev->bridge_has_one_vga) {
+ if (!vgadev->bridge_has_one_vga)
vga_irq_set_state(vgadev, true);
- }
+
vgadev->owns |= wants;
lock_them:
vgadev->locks |= (rsrc & VGA_RSRC_LEGACY_MASK);
@@ -394,8 +395,10 @@ int vga_get(struct pci_dev *pdev, unsigned int rsrc, int interruptible)
set_current_state(interruptible ?
TASK_INTERRUPTIBLE :
TASK_UNINTERRUPTIBLE);
- if (signal_pending(current)) {
- rc = -EINTR;
+ if (interruptible && signal_pending(current)) {
+ __set_current_state(TASK_RUNNING);
+ remove_wait_queue(&vga_wait_queue, &wait);
+ rc = -ERESTARTSYS;
break;
}
schedule();
@@ -452,15 +455,15 @@ bail:
}
EXPORT_SYMBOL(vga_put);
-/* Rules for using a bridge to control a VGA descendant decoding:
- if a bridge has only one VGA descendant then it can be used
- to control the VGA routing for that device.
- It should always use the bridge closest to the device to control it.
- If a bridge has a direct VGA descendant, but also have a sub-bridge
- VGA descendant then we cannot use that bridge to control the direct VGA descendant.
- So for every device we register, we need to iterate all its parent bridges
- so we can invalidate any devices using them properly.
-*/
+/*
+ * Rules for using a bridge to control a VGA descendant decoding: if a bridge
+ * has only one VGA descendant then it can be used to control the VGA routing
+ * for that device. It should always use the bridge closest to the device to
+ * control it. If a bridge has a direct VGA descendant, but also have a sub-
+ * bridge VGA descendant then we cannot use that bridge to control the direct
+ * VGA descendant. So for every device we register, we need to iterate all
+ * its parent bridges so we can invalidate any devices using them properly.
+ */
static void vga_arbiter_check_bridge_sharing(struct vga_device *vgadev)
{
struct vga_device *same_bridge_vgadev;
@@ -484,21 +487,26 @@ static void vga_arbiter_check_bridge_sharing(struct vga_device *vgadev)
/* see if the share a bridge with this device */
if (new_bridge == bridge) {
- /* if their direct parent bridge is the same
- as any bridge of this device then it can't be used
- for that device */
+ /*
+ * If their direct parent bridge is the same
+ * as any bridge of this device then it can't
+ * be used for that device.
+ */
same_bridge_vgadev->bridge_has_one_vga = false;
}
- /* now iterate the previous devices bridge hierarchy */
- /* if the new devices parent bridge is in the other devices
- hierarchy then we can't use it to control this device */
+ /*
+ * Now iterate the previous devices bridge hierarchy.
+ * If the new devices parent bridge is in the other
+ * devices hierarchy then we can't use it to control
+ * this device
+ */
while (bus) {
bridge = bus->self;
- if (bridge) {
- if (bridge == vgadev->pdev->bus->self)
- vgadev->bridge_has_one_vga = false;
- }
+
+ if (bridge && bridge == vgadev->pdev->bus->self)
+ vgadev->bridge_has_one_vga = false;
+
bus = bus->parent;
}
}
@@ -525,18 +533,16 @@ static bool vga_arbiter_add_pci_device(struct pci_dev *pdev)
return false;
/* Allocate structure */
- vgadev = kmalloc(sizeof(struct vga_device), GFP_KERNEL);
+ vgadev = kzalloc(sizeof(struct vga_device), GFP_KERNEL);
if (vgadev == NULL) {
- pr_err("vgaarb: failed to allocate pci device\n");
- /* What to do on allocation failure ? For now, let's
- * just do nothing, I'm not sure there is anything saner
- * to be done
+ pr_err("failed to allocate pci device\n");
+ /*
+ * What to do on allocation failure ? For now, let's just do
+ * nothing, I'm not sure there is anything saner to be done.
*/
return false;
}
- memset(vgadev, 0, sizeof(*vgadev));
-
/* Take lock & check for duplicates */
spin_lock_irqsave(&vga_lock, flags);
if (vgadev_find(pdev) != NULL) {
@@ -566,8 +572,8 @@ static bool vga_arbiter_add_pci_device(struct pci_dev *pdev)
bridge = bus->self;
if (bridge) {
u16 l;
- pci_read_config_word(bridge, PCI_BRIDGE_CONTROL,
- &l);
+
+ pci_read_config_word(bridge, PCI_BRIDGE_CONTROL, &l);
if (!(l & PCI_BRIDGE_CTL_VGA)) {
vgadev->owns = 0;
break;
@@ -581,8 +587,7 @@ static bool vga_arbiter_add_pci_device(struct pci_dev *pdev)
*/
if (vga_default == NULL &&
((vgadev->owns & VGA_RSRC_LEGACY_MASK) == VGA_RSRC_LEGACY_MASK)) {
- pr_info("vgaarb: setting as boot device: PCI:%s\n",
- pci_name(pdev));
+ pr_info("setting as boot device: PCI:%s\n", pci_name(pdev));
vga_set_default_device(pdev);
}
@@ -591,7 +596,7 @@ static bool vga_arbiter_add_pci_device(struct pci_dev *pdev)
/* Add to the list */
list_add(&vgadev->list, &vga_list);
vga_count++;
- pr_info("vgaarb: device added: PCI:%s,decodes=%s,owns=%s,locks=%s\n",
+ pr_info("device added: PCI:%s,decodes=%s,owns=%s,locks=%s\n",
pci_name(pdev),
vga_iostate_to_str(vgadev->decodes),
vga_iostate_to_str(vgadev->owns),
@@ -651,7 +656,7 @@ static inline void vga_update_device_decodes(struct vga_device *vgadev,
decodes_unlocked = vgadev->locks & decodes_removed;
vgadev->decodes = new_decodes;
- pr_info("vgaarb: device changed decodes: PCI:%s,olddecodes=%s,decodes=%s:owns=%s\n",
+ pr_info("device changed decodes: PCI:%s,olddecodes=%s,decodes=%s:owns=%s\n",
pci_name(vgadev->pdev),
vga_iostate_to_str(old_decodes),
vga_iostate_to_str(vgadev->decodes),
@@ -673,10 +678,12 @@ static inline void vga_update_device_decodes(struct vga_device *vgadev,
if (!(old_decodes & VGA_RSRC_LEGACY_MASK) &&
new_decodes & VGA_RSRC_LEGACY_MASK)
vga_decode_count++;
- pr_debug("vgaarb: decoding count now is: %d\n", vga_decode_count);
+ pr_debug("decoding count now is: %d\n", vga_decode_count);
}
-static void __vga_set_legacy_decoding(struct pci_dev *pdev, unsigned int decodes, bool userspace)
+static void __vga_set_legacy_decoding(struct pci_dev *pdev,
+ unsigned int decodes,
+ bool userspace)
{
struct vga_device *vgadev;
unsigned long flags;
@@ -712,7 +719,8 @@ EXPORT_SYMBOL(vga_set_legacy_decoding);
/* call with NULL to unregister */
int vga_client_register(struct pci_dev *pdev, void *cookie,
void (*irq_set_state)(void *cookie, bool state),
- unsigned int (*set_vga_decode)(void *cookie, bool decode))
+ unsigned int (*set_vga_decode)(void *cookie,
+ bool decode))
{
int ret = -ENODEV;
struct vga_device *vgadev;
@@ -832,7 +840,7 @@ static int vga_pci_str_to_vars(char *buf, int count, unsigned int *domain,
return 1;
}
-static ssize_t vga_arb_read(struct file *file, char __user * buf,
+static ssize_t vga_arb_read(struct file *file, char __user *buf,
size_t count, loff_t *ppos)
{
struct vga_arb_private *priv = file->private_data;
@@ -899,7 +907,7 @@ done:
* TODO: To avoid parsing inside kernel and to improve the speed we may
* consider use ioctl here
*/
-static ssize_t vga_arb_write(struct file *file, const char __user * buf,
+static ssize_t vga_arb_write(struct file *file, const char __user *buf,
size_t count, loff_t *ppos)
{
struct vga_arb_private *priv = file->private_data;
@@ -1075,13 +1083,13 @@ static ssize_t vga_arb_write(struct file *file, const char __user * buf,
ret_val = -EPROTO;
goto done;
}
- pr_debug("vgaarb: %s ==> %x:%x:%x.%x\n", curr_pos,
+ pr_debug("%s ==> %x:%x:%x.%x\n", curr_pos,
domain, bus, PCI_SLOT(devfn), PCI_FUNC(devfn));
pdev = pci_get_domain_bus_and_slot(domain, bus, devfn);
- pr_debug("vgaarb: pdev %p\n", pdev);
+ pr_debug("pdev %p\n", pdev);
if (!pdev) {
- pr_err("vgaarb: invalid PCI address %x:%x:%x\n",
+ pr_err("invalid PCI address %x:%x:%x\n",
domain, bus, devfn);
ret_val = -ENODEV;
goto done;
@@ -1089,10 +1097,13 @@ static ssize_t vga_arb_write(struct file *file, const char __user * buf,
}
vgadev = vgadev_find(pdev);
- pr_debug("vgaarb: vgadev %p\n", vgadev);
+ pr_debug("vgadev %p\n", vgadev);
if (vgadev == NULL) {
- pr_err("vgaarb: this pci device is not a vga device\n");
- pci_dev_put(pdev);
+ if (pdev) {
+ pr_err("this pci device is not a vga device\n");
+ pci_dev_put(pdev);
+ }
+
ret_val = -ENODEV;
goto done;
}
@@ -1109,7 +1120,7 @@ static ssize_t vga_arb_write(struct file *file, const char __user * buf,
}
}
if (i == MAX_USER_CARDS) {
- pr_err("vgaarb: maximum user cards (%d) number reached!\n",
+ pr_err("maximum user cards (%d) number reached!\n",
MAX_USER_CARDS);
pci_dev_put(pdev);
/* XXX: which value to return? */
@@ -1125,7 +1136,7 @@ static ssize_t vga_arb_write(struct file *file, const char __user * buf,
} else if (strncmp(curr_pos, "decodes ", 8) == 0) {
curr_pos += 8;
remaining -= 8;
- pr_debug("vgaarb: client 0x%p called 'decodes'\n", priv);
+ pr_debug("client 0x%p called 'decodes'\n", priv);
if (!vga_str_to_iostate(curr_pos, remaining, &io_state)) {
ret_val = -EPROTO;
@@ -1150,7 +1161,7 @@ done:
return ret_val;
}
-static unsigned int vga_arb_fpoll(struct file *file, poll_table * wait)
+static unsigned int vga_arb_fpoll(struct file *file, poll_table *wait)
{
struct vga_arb_private *priv = file->private_data;
@@ -1246,7 +1257,8 @@ static void vga_arbiter_notify_clients(void)
else
new_state = true;
if (vgadev->set_vga_decode) {
- new_decodes = vgadev->set_vga_decode(vgadev->cookie, new_state);
+ new_decodes = vgadev->set_vga_decode(vgadev->cookie,
+ new_state);
vga_update_device_decodes(vgadev, new_decodes);
}
}
@@ -1300,7 +1312,7 @@ static int __init vga_arb_device_init(void)
rc = misc_register(&vga_arb_device);
if (rc < 0)
- pr_err("vgaarb: error %d registering device\n", rc);
+ pr_err("error %d registering device\n", rc);
bus_register_notifier(&pci_bus_type, &pci_notifier);
@@ -1312,21 +1324,29 @@ static int __init vga_arb_device_init(void)
PCI_ANY_ID, pdev)) != NULL)
vga_arbiter_add_pci_device(pdev);
- pr_info("vgaarb: loaded\n");
+ pr_info("loaded\n");
list_for_each_entry(vgadev, &vga_list, list) {
#if defined(CONFIG_X86) || defined(CONFIG_IA64)
- /* Override I/O based detection done by vga_arbiter_add_pci_device()
- * as it may take the wrong device (e.g. on Apple system under EFI).
+ /*
+ * Override vga_arbiter_add_pci_device()'s I/O based detection
+ * as it may take the wrong device (e.g. on Apple system under
+ * EFI).
*
- * Select the device owning the boot framebuffer if there is one.
+ * Select the device owning the boot framebuffer if there is
+ * one.
*/
- resource_size_t start, end;
+ resource_size_t start, end, limit;
+ unsigned long flags;
int i;
+ limit = screen_info.lfb_base + screen_info.lfb_size;
+
/* Does firmware framebuffer belong to us? */
for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
- if (!(pci_resource_flags(vgadev->pdev, i) & IORESOURCE_MEM))
+ flags = pci_resource_flags(vgadev->pdev, i);
+
+ if ((flags & IORESOURCE_MEM) == 0)
continue;
start = pci_resource_start(vgadev->pdev, i);
@@ -1335,22 +1355,24 @@ static int __init vga_arb_device_init(void)
if (!start || !end)
continue;
- if (screen_info.lfb_base < start ||
- (screen_info.lfb_base + screen_info.lfb_size) >= end)
+ if (screen_info.lfb_base < start || limit >= end)
continue;
+
if (!vga_default_device())
- pr_info("vgaarb: setting as boot device: PCI:%s\n",
+ pr_info("setting as boot device: PCI:%s\n",
pci_name(vgadev->pdev));
else if (vgadev->pdev != vga_default_device())
- pr_info("vgaarb: overriding boot device: PCI:%s\n",
+ pr_info("overriding boot device: PCI:%s\n",
pci_name(vgadev->pdev));
vga_set_default_device(vgadev->pdev);
}
#endif
if (vgadev->bridge_has_one_vga)
- pr_info("vgaarb: bridge control possible %s\n", pci_name(vgadev->pdev));
+ pr_info("bridge control possible %s\n",
+ pci_name(vgadev->pdev));
else
- pr_info("vgaarb: no bridge control possible %s\n", pci_name(vgadev->pdev));
+ pr_info("no bridge control possible %s\n",
+ pci_name(vgadev->pdev));
}
return rc;
}