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798ae0f669
debugfs_remove() gracefully ignores NULL parameters, so the explicit checks can be removed. Signed-off-by: Thierry Reding <treding@nvidia.com> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
729 lines
17 KiB
C
729 lines
17 KiB
C
/*
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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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*
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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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*
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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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#define pr_fmt(fmt) "vga_switcheroo: " fmt
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#include <linux/module.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/console.h>
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#include <linux/vga_switcheroo.h>
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#include <linux/pm_runtime.h>
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#include <linux/vgaarb.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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const struct vga_switcheroo_client_ops *ops;
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int id;
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bool active;
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bool driver_power_control;
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struct list_head list;
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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 list_head clients;
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struct vga_switcheroo_handler *handler;
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};
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#define ID_BIT_AUDIO 0x100
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#define client_is_audio(c) ((c)->id & ID_BIT_AUDIO)
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#define client_is_vga(c) ((c)->id == -1 || !client_is_audio(c))
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#define client_id(c) ((c)->id & ~ID_BIT_AUDIO)
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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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.clients = LIST_HEAD_INIT(vgasr_priv.clients),
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};
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static bool vga_switcheroo_ready(void)
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{
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/* we're ready if we get two clients + handler */
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return !vgasr_priv.active &&
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vgasr_priv.registered_clients == 2 && vgasr_priv.handler;
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}
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static void vga_switcheroo_enable(void)
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{
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int ret;
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struct vga_switcheroo_client *client;
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/* call the handler to init */
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if (vgasr_priv.handler->init)
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vgasr_priv.handler->init();
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list_for_each_entry(client, &vgasr_priv.clients, list) {
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if (client->id != -1)
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continue;
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ret = vgasr_priv.handler->get_client_id(client->pdev);
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if (ret < 0)
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return;
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client->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_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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if (vga_switcheroo_ready()) {
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pr_info("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_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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if (vgasr_priv.active) {
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pr_info("disabled\n");
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vga_switcheroo_debugfs_fini(&vgasr_priv);
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vgasr_priv.active = false;
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}
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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 int register_client(struct pci_dev *pdev,
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const struct vga_switcheroo_client_ops *ops,
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int id, bool active, bool driver_power_control)
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{
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struct vga_switcheroo_client *client;
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client = kzalloc(sizeof(*client), GFP_KERNEL);
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if (!client)
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return -ENOMEM;
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client->pwr_state = VGA_SWITCHEROO_ON;
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client->pdev = pdev;
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client->ops = ops;
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client->id = id;
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client->active = active;
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client->driver_power_control = driver_power_control;
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mutex_lock(&vgasr_mutex);
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list_add_tail(&client->list, &vgasr_priv.clients);
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if (client_is_vga(client))
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vgasr_priv.registered_clients++;
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if (vga_switcheroo_ready()) {
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pr_info("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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int vga_switcheroo_register_client(struct pci_dev *pdev,
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const struct vga_switcheroo_client_ops *ops,
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bool driver_power_control)
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{
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return register_client(pdev, ops, -1,
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pdev == vga_default_device(),
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driver_power_control);
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}
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EXPORT_SYMBOL(vga_switcheroo_register_client);
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int vga_switcheroo_register_audio_client(struct pci_dev *pdev,
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const struct vga_switcheroo_client_ops *ops,
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int id, bool active)
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{
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return register_client(pdev, ops, id | ID_BIT_AUDIO, active, false);
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}
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EXPORT_SYMBOL(vga_switcheroo_register_audio_client);
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static struct vga_switcheroo_client *
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find_client_from_pci(struct list_head *head, struct pci_dev *pdev)
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{
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struct vga_switcheroo_client *client;
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list_for_each_entry(client, head, list)
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if (client->pdev == pdev)
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return client;
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return NULL;
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}
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static struct vga_switcheroo_client *
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find_client_from_id(struct list_head *head, int client_id)
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{
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struct vga_switcheroo_client *client;
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list_for_each_entry(client, head, list)
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if (client->id == client_id)
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return client;
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return NULL;
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}
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static struct vga_switcheroo_client *
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find_active_client(struct list_head *head)
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{
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struct vga_switcheroo_client *client;
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list_for_each_entry(client, head, list)
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if (client->active && client_is_vga(client))
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return client;
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return NULL;
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}
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int vga_switcheroo_get_client_state(struct pci_dev *pdev)
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{
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struct vga_switcheroo_client *client;
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client = find_client_from_pci(&vgasr_priv.clients, pdev);
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if (!client)
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return VGA_SWITCHEROO_NOT_FOUND;
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if (!vgasr_priv.active)
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return VGA_SWITCHEROO_INIT;
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return client->pwr_state;
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}
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EXPORT_SYMBOL(vga_switcheroo_get_client_state);
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void vga_switcheroo_unregister_client(struct pci_dev *pdev)
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{
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struct vga_switcheroo_client *client;
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mutex_lock(&vgasr_mutex);
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client = find_client_from_pci(&vgasr_priv.clients, pdev);
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if (client) {
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if (client_is_vga(client))
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vgasr_priv.registered_clients--;
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list_del(&client->list);
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kfree(client);
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}
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if (vgasr_priv.active && vgasr_priv.registered_clients < 2) {
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pr_info("disabled\n");
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vga_switcheroo_debugfs_fini(&vgasr_priv);
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vgasr_priv.active = false;
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}
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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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struct vga_switcheroo_client *client;
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mutex_lock(&vgasr_mutex);
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client = find_client_from_pci(&vgasr_priv.clients, pdev);
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if (client)
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client->fb_info = info;
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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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struct vga_switcheroo_client *client;
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int i = 0;
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mutex_lock(&vgasr_mutex);
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list_for_each_entry(client, &vgasr_priv.clients, list) {
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seq_printf(m, "%d:%s%s:%c:%s%s:%s\n", i,
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client_id(client) == VGA_SWITCHEROO_DIS ? "DIS" :
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"IGD",
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client_is_vga(client) ? "" : "-Audio",
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client->active ? '+' : ' ',
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client->driver_power_control ? "Dyn" : "",
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client->pwr_state ? "Pwr" : "Off",
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pci_name(client->pdev));
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i++;
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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 (client->driver_power_control)
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return 0;
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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->ops->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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if (client->driver_power_control)
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return 0;
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/* call the driver callback to turn off device */
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client->ops->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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static void set_audio_state(int id, int state)
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{
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struct vga_switcheroo_client *client;
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client = find_client_from_id(&vgasr_priv.clients, id | ID_BIT_AUDIO);
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if (client && client->pwr_state != state) {
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client->ops->set_gpu_state(client->pdev, state);
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client->pwr_state = state;
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}
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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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struct vga_switcheroo_client *active;
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active = find_active_client(&vgasr_priv.clients);
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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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vga_set_default_device(new_client->pdev);
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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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struct vga_switcheroo_client *active;
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active = find_active_client(&vgasr_priv.clients);
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if (!active)
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return 0;
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active->active = false;
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set_audio_state(active->id, VGA_SWITCHEROO_OFF);
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if (new_client->fb_info) {
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struct fb_event event;
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console_lock();
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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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console_unlock();
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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->ops->reprobe)
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new_client->ops->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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set_audio_state(new_client->id, VGA_SWITCHEROO_ON);
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new_client->active = true;
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return 0;
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}
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static bool check_can_switch(void)
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{
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struct vga_switcheroo_client *client;
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list_for_each_entry(client, &vgasr_priv.clients, list) {
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if (!client->ops->can_switch(client->pdev)) {
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pr_err("client %x refused switch\n", client->id);
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return false;
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}
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}
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return true;
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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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int 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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list_for_each_entry(client, &vgasr_priv.clients, list) {
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if (client->active || client_is_audio(client))
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continue;
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if (client->driver_power_control)
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continue;
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set_audio_state(client->id, VGA_SWITCHEROO_OFF);
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if (client->pwr_state == VGA_SWITCHEROO_ON)
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vga_switchoff(client);
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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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list_for_each_entry(client, &vgasr_priv.clients, list) {
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if (client->active || client_is_audio(client))
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continue;
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if (client->driver_power_control)
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continue;
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if (client->pwr_state == VGA_SWITCHEROO_OFF)
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vga_switchon(client);
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set_audio_state(client->id, VGA_SWITCHEROO_ON);
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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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client = find_client_from_id(&vgasr_priv.clients, client_id);
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if (!client)
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goto out;
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vgasr_priv.delayed_switch_active = false;
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if (just_mux) {
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ret = vgasr_priv.handler->switchto(client_id);
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goto out;
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}
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if (client->active)
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goto out;
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/* okay we want a switch - test if devices are willing to switch */
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can_switch = check_can_switch();
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if (can_switch == false && delay == false)
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goto out;
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if (can_switch) {
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ret = vga_switchto_stage1(client);
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if (ret)
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pr_err("switching failed stage 1 %d\n", ret);
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ret = vga_switchto_stage2(client);
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if (ret)
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pr_err("switching failed stage 2 %d\n", ret);
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} else {
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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)
|
|
pr_err("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)
|
|
{
|
|
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) {
|
|
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);
|
|
if (!priv->switch_file) {
|
|
pr_err("cannot create %s/vgaswitcheroo/switch\n", mp);
|
|
goto fail;
|
|
}
|
|
return 0;
|
|
fail:
|
|
vga_switcheroo_debugfs_fini(priv);
|
|
return -1;
|
|
}
|
|
|
|
int vga_switcheroo_process_delayed_switch(void)
|
|
{
|
|
struct vga_switcheroo_client *client;
|
|
int ret;
|
|
int err = -EINVAL;
|
|
|
|
mutex_lock(&vgasr_mutex);
|
|
if (!vgasr_priv.delayed_switch_active)
|
|
goto err;
|
|
|
|
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);
|
|
if (!client || !check_can_switch())
|
|
goto err;
|
|
|
|
ret = vga_switchto_stage2(client);
|
|
if (ret)
|
|
pr_err("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);
|
|
|
|
static void vga_switcheroo_power_switch(struct pci_dev *pdev,
|
|
enum vga_switcheroo_state state)
|
|
{
|
|
struct vga_switcheroo_client *client;
|
|
|
|
if (!vgasr_priv.handler->power_state)
|
|
return;
|
|
|
|
client = find_client_from_pci(&vgasr_priv.clients, pdev);
|
|
if (!client)
|
|
return;
|
|
|
|
if (!client->driver_power_control)
|
|
return;
|
|
|
|
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)
|
|
{
|
|
struct vga_switcheroo_client *client;
|
|
|
|
client = find_client_from_pci(&vgasr_priv.clients, pdev);
|
|
if (!client)
|
|
return;
|
|
|
|
if (!client->driver_power_control)
|
|
return;
|
|
|
|
client->pwr_state = dynamic;
|
|
set_audio_state(client->id, dynamic);
|
|
}
|
|
EXPORT_SYMBOL(vga_switcheroo_set_dynamic_switch);
|
|
|
|
/* switcheroo power domain */
|
|
static int vga_switcheroo_runtime_suspend(struct device *dev)
|
|
{
|
|
struct pci_dev *pdev = to_pci_dev(dev);
|
|
int ret;
|
|
|
|
ret = dev->bus->pm->runtime_suspend(dev);
|
|
if (ret)
|
|
return ret;
|
|
if (vgasr_priv.handler->switchto)
|
|
vgasr_priv.handler->switchto(VGA_SWITCHEROO_IGD);
|
|
vga_switcheroo_power_switch(pdev, VGA_SWITCHEROO_OFF);
|
|
return 0;
|
|
}
|
|
|
|
static int vga_switcheroo_runtime_resume(struct device *dev)
|
|
{
|
|
struct pci_dev *pdev = to_pci_dev(dev);
|
|
int ret;
|
|
|
|
vga_switcheroo_power_switch(pdev, VGA_SWITCHEROO_ON);
|
|
ret = dev->bus->pm->runtime_resume(dev);
|
|
if (ret)
|
|
return ret;
|
|
|
|
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)
|
|
{
|
|
/* copy over all the bus versions */
|
|
if (dev->bus && dev->bus->pm) {
|
|
domain->ops = *dev->bus->pm;
|
|
domain->ops.runtime_suspend = vga_switcheroo_runtime_suspend;
|
|
domain->ops.runtime_resume = vga_switcheroo_runtime_resume;
|
|
|
|
dev->pm_domain = domain;
|
|
return 0;
|
|
}
|
|
dev->pm_domain = NULL;
|
|
return -EINVAL;
|
|
}
|
|
EXPORT_SYMBOL(vga_switcheroo_init_domain_pm_ops);
|
|
|
|
void vga_switcheroo_fini_domain_pm_ops(struct device *dev)
|
|
{
|
|
dev->pm_domain = NULL;
|
|
}
|
|
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);
|
|
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 */
|
|
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;
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
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);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
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;
|
|
|
|
dev->pm_domain = domain;
|
|
return 0;
|
|
}
|
|
dev->pm_domain = NULL;
|
|
return -EINVAL;
|
|
}
|
|
EXPORT_SYMBOL(vga_switcheroo_init_domain_pm_optimus_hdmi_audio);
|