493 lines
12 KiB
C
493 lines
12 KiB
C
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/*
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* Copyright (c) 2010 Red Hat Inc.
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* Author : Dave Airlie <airlied@redhat.com>
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*
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*
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* Licensed under GPLv2
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*
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* vga_switcheroo.c - Support for laptop with dual GPU using one set of outputs
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Switcher interface - methods require for ATPX and DCM
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- switchto - this throws the output MUX switch
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- discrete_set_power - sets the power state for the discrete card
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GPU driver interface
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- set_gpu_state - this should do the equiv of s/r for the card
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- this should *not* set the discrete power state
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- switch_check - check if the device is in a position to switch now
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*/
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#include <linux/module.h>
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#include <linux/dmi.h>
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#include <linux/seq_file.h>
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#include <linux/uaccess.h>
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#include <linux/fs.h>
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#include <linux/debugfs.h>
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#include <linux/fb.h>
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#include <linux/pci.h>
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#include <linux/vga_switcheroo.h>
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struct vga_switcheroo_client {
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struct pci_dev *pdev;
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struct fb_info *fb_info;
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int pwr_state;
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void (*set_gpu_state)(struct pci_dev *pdev, enum vga_switcheroo_state);
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void (*reprobe)(struct pci_dev *pdev);
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bool (*can_switch)(struct pci_dev *pdev);
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int id;
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bool active;
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};
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static DEFINE_MUTEX(vgasr_mutex);
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struct vgasr_priv {
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bool active;
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bool delayed_switch_active;
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enum vga_switcheroo_client_id delayed_client_id;
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struct dentry *debugfs_root;
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struct dentry *switch_file;
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int registered_clients;
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struct vga_switcheroo_client clients[VGA_SWITCHEROO_MAX_CLIENTS];
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struct vga_switcheroo_handler *handler;
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};
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static int vga_switcheroo_debugfs_init(struct vgasr_priv *priv);
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static void vga_switcheroo_debugfs_fini(struct vgasr_priv *priv);
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/* only one switcheroo per system */
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static struct vgasr_priv vgasr_priv;
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int vga_switcheroo_register_handler(struct vga_switcheroo_handler *handler)
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{
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mutex_lock(&vgasr_mutex);
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if (vgasr_priv.handler) {
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mutex_unlock(&vgasr_mutex);
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return -EINVAL;
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}
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vgasr_priv.handler = handler;
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mutex_unlock(&vgasr_mutex);
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return 0;
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}
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EXPORT_SYMBOL(vga_switcheroo_register_handler);
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void vga_switcheroo_unregister_handler(void)
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{
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mutex_lock(&vgasr_mutex);
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vgasr_priv.handler = NULL;
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mutex_unlock(&vgasr_mutex);
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}
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EXPORT_SYMBOL(vga_switcheroo_unregister_handler);
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static void vga_switcheroo_enable(void)
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{
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int i;
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int ret;
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/* call the handler to init */
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vgasr_priv.handler->init();
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for (i = 0; i < VGA_SWITCHEROO_MAX_CLIENTS; i++) {
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ret = vgasr_priv.handler->get_client_id(vgasr_priv.clients[i].pdev);
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if (ret < 0)
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return;
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vgasr_priv.clients[i].id = ret;
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}
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vga_switcheroo_debugfs_init(&vgasr_priv);
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vgasr_priv.active = true;
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}
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int vga_switcheroo_register_client(struct pci_dev *pdev,
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void (*set_gpu_state)(struct pci_dev *pdev, enum vga_switcheroo_state),
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void (*reprobe)(struct pci_dev *pdev),
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bool (*can_switch)(struct pci_dev *pdev))
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{
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int index;
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mutex_lock(&vgasr_mutex);
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/* don't do IGD vs DIS here */
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if (vgasr_priv.registered_clients & 1)
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index = 1;
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else
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index = 0;
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vgasr_priv.clients[index].pwr_state = VGA_SWITCHEROO_ON;
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vgasr_priv.clients[index].pdev = pdev;
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vgasr_priv.clients[index].set_gpu_state = set_gpu_state;
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vgasr_priv.clients[index].reprobe = reprobe;
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vgasr_priv.clients[index].can_switch = can_switch;
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vgasr_priv.clients[index].id = -1;
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if (pdev->resource[PCI_ROM_RESOURCE].flags & IORESOURCE_ROM_SHADOW)
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vgasr_priv.clients[index].active = true;
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vgasr_priv.registered_clients |= (1 << index);
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/* if we get two clients + handler */
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if (vgasr_priv.registered_clients == 0x3 && vgasr_priv.handler) {
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printk(KERN_INFO "vga_switcheroo: enabled\n");
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vga_switcheroo_enable();
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}
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mutex_unlock(&vgasr_mutex);
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return 0;
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}
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EXPORT_SYMBOL(vga_switcheroo_register_client);
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void vga_switcheroo_unregister_client(struct pci_dev *pdev)
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{
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int i;
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mutex_lock(&vgasr_mutex);
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for (i = 0; i < VGA_SWITCHEROO_MAX_CLIENTS; i++) {
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if (vgasr_priv.clients[i].pdev == pdev) {
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vgasr_priv.registered_clients &= ~(1 << i);
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break;
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}
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}
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printk(KERN_INFO "vga_switcheroo: disabled\n");
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vga_switcheroo_debugfs_fini(&vgasr_priv);
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vgasr_priv.active = false;
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mutex_unlock(&vgasr_mutex);
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}
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EXPORT_SYMBOL(vga_switcheroo_unregister_client);
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void vga_switcheroo_client_fb_set(struct pci_dev *pdev,
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struct fb_info *info)
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{
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int i;
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mutex_lock(&vgasr_mutex);
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for (i = 0; i < VGA_SWITCHEROO_MAX_CLIENTS; i++) {
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if (vgasr_priv.clients[i].pdev == pdev) {
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vgasr_priv.clients[i].fb_info = info;
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break;
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}
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}
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mutex_unlock(&vgasr_mutex);
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}
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EXPORT_SYMBOL(vga_switcheroo_client_fb_set);
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static int vga_switcheroo_show(struct seq_file *m, void *v)
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{
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int i;
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mutex_lock(&vgasr_mutex);
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for (i = 0; i < VGA_SWITCHEROO_MAX_CLIENTS; i++) {
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seq_printf(m, "%d:%s:%c:%s:%s\n", i,
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vgasr_priv.clients[i].id == VGA_SWITCHEROO_DIS ? "DIS" : "IGD",
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vgasr_priv.clients[i].active ? '+' : ' ',
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vgasr_priv.clients[i].pwr_state ? "Pwr" : "Off",
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pci_name(vgasr_priv.clients[i].pdev));
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}
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mutex_unlock(&vgasr_mutex);
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return 0;
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}
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static int vga_switcheroo_debugfs_open(struct inode *inode, struct file *file)
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{
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return single_open(file, vga_switcheroo_show, NULL);
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}
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static int vga_switchon(struct vga_switcheroo_client *client)
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{
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if (vgasr_priv.handler->power_state)
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vgasr_priv.handler->power_state(client->id, VGA_SWITCHEROO_ON);
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/* call the driver callback to turn on device */
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client->set_gpu_state(client->pdev, VGA_SWITCHEROO_ON);
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client->pwr_state = VGA_SWITCHEROO_ON;
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return 0;
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}
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static int vga_switchoff(struct vga_switcheroo_client *client)
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{
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/* call the driver callback to turn off device */
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client->set_gpu_state(client->pdev, VGA_SWITCHEROO_OFF);
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if (vgasr_priv.handler->power_state)
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vgasr_priv.handler->power_state(client->id, VGA_SWITCHEROO_OFF);
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client->pwr_state = VGA_SWITCHEROO_OFF;
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return 0;
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}
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/* stage one happens before delay */
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static int vga_switchto_stage1(struct vga_switcheroo_client *new_client)
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{
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int i;
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struct vga_switcheroo_client *active = NULL;
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for (i = 0; i < VGA_SWITCHEROO_MAX_CLIENTS; i++) {
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if (vgasr_priv.clients[i].active == true) {
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active = &vgasr_priv.clients[i];
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break;
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}
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}
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if (!active)
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return 0;
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if (new_client->pwr_state == VGA_SWITCHEROO_OFF)
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vga_switchon(new_client);
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/* swap shadow resource to denote boot VGA device has changed so X starts on new device */
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active->pdev->resource[PCI_ROM_RESOURCE].flags &= ~IORESOURCE_ROM_SHADOW;
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new_client->pdev->resource[PCI_ROM_RESOURCE].flags |= IORESOURCE_ROM_SHADOW;
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return 0;
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}
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/* post delay */
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static int vga_switchto_stage2(struct vga_switcheroo_client *new_client)
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{
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int ret;
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int i;
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struct vga_switcheroo_client *active = NULL;
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for (i = 0; i < VGA_SWITCHEROO_MAX_CLIENTS; i++) {
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if (vgasr_priv.clients[i].active == true) {
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active = &vgasr_priv.clients[i];
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break;
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}
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}
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if (!active)
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return 0;
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active->active = false;
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if (new_client->fb_info) {
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struct fb_event event;
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event.info = new_client->fb_info;
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fb_notifier_call_chain(FB_EVENT_REMAP_ALL_CONSOLE, &event);
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}
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ret = vgasr_priv.handler->switchto(new_client->id);
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if (ret)
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return ret;
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if (new_client->reprobe)
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new_client->reprobe(new_client->pdev);
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if (active->pwr_state == VGA_SWITCHEROO_ON)
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vga_switchoff(active);
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new_client->active = true;
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return 0;
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}
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static ssize_t
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vga_switcheroo_debugfs_write(struct file *filp, const char __user *ubuf,
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size_t cnt, loff_t *ppos)
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{
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char usercmd[64];
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const char *pdev_name;
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int i, ret;
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bool delay = false, can_switch;
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bool just_mux = false;
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int client_id = -1;
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struct vga_switcheroo_client *client = NULL;
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if (cnt > 63)
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cnt = 63;
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if (copy_from_user(usercmd, ubuf, cnt))
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return -EFAULT;
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mutex_lock(&vgasr_mutex);
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if (!vgasr_priv.active) {
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cnt = -EINVAL;
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goto out;
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}
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/* pwr off the device not in use */
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if (strncmp(usercmd, "OFF", 3) == 0) {
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for (i = 0; i < VGA_SWITCHEROO_MAX_CLIENTS; i++) {
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if (vgasr_priv.clients[i].active)
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continue;
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if (vgasr_priv.clients[i].pwr_state == VGA_SWITCHEROO_ON)
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vga_switchoff(&vgasr_priv.clients[i]);
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}
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goto out;
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}
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/* pwr on the device not in use */
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if (strncmp(usercmd, "ON", 2) == 0) {
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for (i = 0; i < VGA_SWITCHEROO_MAX_CLIENTS; i++) {
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if (vgasr_priv.clients[i].active)
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continue;
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if (vgasr_priv.clients[i].pwr_state == VGA_SWITCHEROO_OFF)
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vga_switchon(&vgasr_priv.clients[i]);
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}
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goto out;
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}
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/* request a delayed switch - test can we switch now */
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if (strncmp(usercmd, "DIGD", 4) == 0) {
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client_id = VGA_SWITCHEROO_IGD;
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delay = true;
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}
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if (strncmp(usercmd, "DDIS", 4) == 0) {
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client_id = VGA_SWITCHEROO_DIS;
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delay = true;
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}
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if (strncmp(usercmd, "IGD", 3) == 0)
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client_id = VGA_SWITCHEROO_IGD;
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if (strncmp(usercmd, "DIS", 3) == 0)
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client_id = VGA_SWITCHEROO_DIS;
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if (strncmp(usercmd, "MIGD", 4) == 0) {
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just_mux = true;
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client_id = VGA_SWITCHEROO_IGD;
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}
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if (strncmp(usercmd, "MDIS", 4) == 0) {
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just_mux = true;
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client_id = VGA_SWITCHEROO_DIS;
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}
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if (client_id == -1)
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goto out;
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for (i = 0; i < VGA_SWITCHEROO_MAX_CLIENTS; i++) {
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if (vgasr_priv.clients[i].id == client_id) {
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client = &vgasr_priv.clients[i];
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break;
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}
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}
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vgasr_priv.delayed_switch_active = false;
|
||
|
|
|
||
|
|
if (just_mux) {
|
||
|
|
ret = vgasr_priv.handler->switchto(client_id);
|
||
|
|
goto out;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (client->active == true)
|
||
|
|
goto out;
|
||
|
|
|
||
|
|
/* okay we want a switch - test if devices are willing to switch */
|
||
|
|
can_switch = true;
|
||
|
|
for (i = 0; i < VGA_SWITCHEROO_MAX_CLIENTS; i++) {
|
||
|
|
can_switch = vgasr_priv.clients[i].can_switch(vgasr_priv.clients[i].pdev);
|
||
|
|
if (can_switch == false) {
|
||
|
|
printk(KERN_ERR "vga_switcheroo: client %d refused switch\n", i);
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if (can_switch == false && delay == false)
|
||
|
|
goto out;
|
||
|
|
|
||
|
|
if (can_switch == true) {
|
||
|
|
pdev_name = pci_name(client->pdev);
|
||
|
|
ret = vga_switchto_stage1(client);
|
||
|
|
if (ret)
|
||
|
|
printk(KERN_ERR "vga_switcheroo: 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);
|
||
|
|
|
||
|
|
} else {
|
||
|
|
printk(KERN_INFO "vga_switcheroo: 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);
|
||
|
|
}
|
||
|
|
|
||
|
|
out:
|
||
|
|
mutex_unlock(&vgasr_mutex);
|
||
|
|
return cnt;
|
||
|
|
}
|
||
|
|
|
||
|
|
static const struct file_operations vga_switcheroo_debugfs_fops = {
|
||
|
|
.owner = THIS_MODULE,
|
||
|
|
.open = vga_switcheroo_debugfs_open,
|
||
|
|
.write = vga_switcheroo_debugfs_write,
|
||
|
|
.read = seq_read,
|
||
|
|
.llseek = seq_lseek,
|
||
|
|
.release = single_release,
|
||
|
|
};
|
||
|
|
|
||
|
|
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;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
static int vga_switcheroo_debugfs_init(struct vgasr_priv *priv)
|
||
|
|
{
|
||
|
|
/* 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");
|
||
|
|
goto fail;
|
||
|
|
}
|
||
|
|
|
||
|
|
priv->switch_file = debugfs_create_file("switch", 0644,
|
||
|
|
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");
|
||
|
|
goto fail;
|
||
|
|
}
|
||
|
|
return 0;
|
||
|
|
fail:
|
||
|
|
vga_switcheroo_debugfs_fini(priv);
|
||
|
|
return -1;
|
||
|
|
}
|
||
|
|
|
||
|
|
int vga_switcheroo_process_delayed_switch(void)
|
||
|
|
{
|
||
|
|
struct vga_switcheroo_client *client = NULL;
|
||
|
|
const char *pdev_name;
|
||
|
|
bool can_switch = true;
|
||
|
|
int i;
|
||
|
|
int ret;
|
||
|
|
int err = -EINVAL;
|
||
|
|
|
||
|
|
mutex_lock(&vgasr_mutex);
|
||
|
|
if (!vgasr_priv.delayed_switch_active)
|
||
|
|
goto err;
|
||
|
|
|
||
|
|
printk(KERN_INFO "vga_switcheroo: processing delayed switch to %d\n", vgasr_priv.delayed_client_id);
|
||
|
|
|
||
|
|
for (i = 0; i < VGA_SWITCHEROO_MAX_CLIENTS; i++) {
|
||
|
|
if (vgasr_priv.clients[i].id == vgasr_priv.delayed_client_id)
|
||
|
|
client = &vgasr_priv.clients[i];
|
||
|
|
can_switch = vgasr_priv.clients[i].can_switch(vgasr_priv.clients[i].pdev);
|
||
|
|
if (can_switch == false) {
|
||
|
|
printk(KERN_ERR "vga_switcheroo: client %d refused switch\n", i);
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if (can_switch == false || client == NULL)
|
||
|
|
goto err;
|
||
|
|
|
||
|
|
pdev_name = pci_name(client->pdev);
|
||
|
|
ret = vga_switchto_stage2(client);
|
||
|
|
if (ret)
|
||
|
|
printk(KERN_ERR "vga_switcheroo: delayed switching failed stage 2 %d\n", ret);
|
||
|
|
|
||
|
|
vgasr_priv.delayed_switch_active = false;
|
||
|
|
err = 0;
|
||
|
|
err:
|
||
|
|
mutex_unlock(&vgasr_mutex);
|
||
|
|
return err;
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL(vga_switcheroo_process_delayed_switch);
|
||
|
|
|