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authorLinus Torvalds <torvalds@linux-foundation.org>2010-03-04 07:49:37 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2010-03-04 07:49:37 -0800
commit03a2c4d76c9e99b80d74ab8a4f344e135a5ae44b (patch)
tree7fd7940a4f87dc1ace1c1bdeb1fb0d90ac3beb13 /drivers/gpu/vga
parenta27341cd5fcb7cf2d2d4726e9f324009f7162c00 (diff)
parentd424b925f7092b9d95e0a8556872349abe79d9b6 (diff)
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Merge branch 'drm-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/airlied/drm-2.6
* 'drm-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/airlied/drm-2.6: (151 commits) vga_switcheroo: disable default y by new rules. drm/nouveau: fix *staging* driver build with switcheroo off. drm/radeon: fix typo in Makefile vga_switcheroo: fix build on platforms with no ACPI drm/radeon: Fix printf type warning in 64bit system. drm/radeon/kms: bump the KMS version number for square tiling support. vga_switcheroo: initial implementation (v15) drm/radeon/kms: do not disable audio engine twice Revert "drm/radeon/kms: disable HDMI audio for now on rv710/rv730" drm/radeon/kms: do not preset audio stuff and start timer when not using audio drm/radeon: r100/r200 ums: block ability for userspace app to trash 0 page and beyond drm/ttm: fix function prototype to match implementation drm/radeon: use ALIGN instead of open coding it drm/radeon/kms: initialize set_surface_reg reg for rs600 asic drm/i915: Use a dmi quirk to skip a broken SDVO TV output. drm/i915: enable/disable LVDS port at DPMS time drm/i915: check for multiple write domains in pin_and_relocate drm/i915: clean-up i915_gem_flush_gpu_write_domain drm/i915: reuse i915_gpu_idle helper drm/i915: ensure lru ordering of fence_list ... Fixed trivial conflicts in drivers/gpu/vga/Kconfig
Diffstat (limited to 'drivers/gpu/vga')
-rw-r--r--drivers/gpu/vga/Kconfig11
-rw-r--r--drivers/gpu/vga/Makefile1
-rw-r--r--drivers/gpu/vga/vga_switcheroo.c450
3 files changed, 462 insertions, 0 deletions
diff --git a/drivers/gpu/vga/Kconfig b/drivers/gpu/vga/Kconfig
index 0920492cea0..61ab4daf0bb 100644
--- a/drivers/gpu/vga/Kconfig
+++ b/drivers/gpu/vga/Kconfig
@@ -16,3 +16,14 @@ config VGA_ARB_MAX_GPUS
help
Reserves space in the kernel to maintain resource locking for
multiple GPUS. The overhead for each GPU is very small.
+
+config VGA_SWITCHEROO
+ bool "Laptop Hybrid Grapics - GPU switching support"
+ depends on X86
+ depends on ACPI
+ help
+ Many laptops released in 2008/9/10 have two gpus with a multiplxer
+ to switch between them. This adds support for dynamic switching when
+ X isn't running and delayed switching until the next logoff. This
+ features is called hybrid graphics, ATI PowerXpress, and Nvidia
+ HybridPower.
diff --git a/drivers/gpu/vga/Makefile b/drivers/gpu/vga/Makefile
index 7cc8c1ed645..14ca30b75d0 100644
--- a/drivers/gpu/vga/Makefile
+++ b/drivers/gpu/vga/Makefile
@@ -1 +1,2 @@
obj-$(CONFIG_VGA_ARB) += vgaarb.o
+obj-$(CONFIG_VGA_SWITCHEROO) += vga_switcheroo.o
diff --git a/drivers/gpu/vga/vga_switcheroo.c b/drivers/gpu/vga/vga_switcheroo.c
new file mode 100644
index 00000000000..d6d1149d525
--- /dev/null
+++ b/drivers/gpu/vga/vga_switcheroo.c
@@ -0,0 +1,450 @@
+/*
+ * Copyright (c) 2010 Red Hat Inc.
+ * Author : Dave Airlie <airlied@redhat.com>
+ *
+ *
+ * Licensed under GPLv2
+ *
+ * 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/dmi.h>
+#include <linux/seq_file.h>
+#include <linux/uaccess.h>
+#include <linux/fs.h>
+#include <linux/debugfs.h>
+#include <linux/fb.h>
+
+#include <linux/pci.h>
+#include <linux/vga_switcheroo.h>
+
+struct vga_switcheroo_client {
+ struct pci_dev *pdev;
+ struct fb_info *fb_info;
+ int pwr_state;
+ void (*set_gpu_state)(struct pci_dev *pdev, enum vga_switcheroo_state);
+ bool (*can_switch)(struct pci_dev *pdev);
+ int id;
+ bool active;
+};
+
+static DEFINE_MUTEX(vgasr_mutex);
+
+struct vgasr_priv {
+
+ bool active;
+ bool delayed_switch_active;
+ enum vga_switcheroo_client_id delayed_client_id;
+
+ struct dentry *debugfs_root;
+ struct dentry *switch_file;
+
+ int registered_clients;
+ struct vga_switcheroo_client clients[VGA_SWITCHEROO_MAX_CLIENTS];
+
+ struct vga_switcheroo_handler *handler;
+};
+
+static int vga_switcheroo_debugfs_init(struct vgasr_priv *priv);
+static void vga_switcheroo_debugfs_fini(struct vgasr_priv *priv);
+
+/* only one switcheroo per system */
+static struct vgasr_priv vgasr_priv;
+
+int vga_switcheroo_register_handler(struct vga_switcheroo_handler *handler)
+{
+ mutex_lock(&vgasr_mutex);
+ if (vgasr_priv.handler) {
+ mutex_unlock(&vgasr_mutex);
+ return -EINVAL;
+ }
+
+ vgasr_priv.handler = handler;
+ mutex_unlock(&vgasr_mutex);
+ return 0;
+}
+EXPORT_SYMBOL(vga_switcheroo_register_handler);
+
+void vga_switcheroo_unregister_handler(void)
+{
+ mutex_lock(&vgasr_mutex);
+ vgasr_priv.handler = NULL;
+ mutex_unlock(&vgasr_mutex);
+}
+EXPORT_SYMBOL(vga_switcheroo_unregister_handler);
+
+static void vga_switcheroo_enable(void)
+{
+ int i;
+ int ret;
+ /* call the handler to init */
+ vgasr_priv.handler->init();
+
+ for (i = 0; i < VGA_SWITCHEROO_MAX_CLIENTS; i++) {
+ ret = vgasr_priv.handler->get_client_id(vgasr_priv.clients[i].pdev);
+ if (ret < 0)
+ return;
+
+ vgasr_priv.clients[i].id = ret;
+ }
+ vga_switcheroo_debugfs_init(&vgasr_priv);
+ vgasr_priv.active = true;
+}
+
+int vga_switcheroo_register_client(struct pci_dev *pdev,
+ void (*set_gpu_state)(struct pci_dev *pdev, enum vga_switcheroo_state),
+ bool (*can_switch)(struct pci_dev *pdev))
+{
+ int index;
+
+ mutex_lock(&vgasr_mutex);
+ /* don't do IGD vs DIS here */
+ if (vgasr_priv.registered_clients & 1)
+ index = 1;
+ else
+ index = 0;
+
+ vgasr_priv.clients[index].pwr_state = VGA_SWITCHEROO_ON;
+ vgasr_priv.clients[index].pdev = pdev;
+ vgasr_priv.clients[index].set_gpu_state = set_gpu_state;
+ vgasr_priv.clients[index].can_switch = can_switch;
+ vgasr_priv.clients[index].id = -1;
+ if (pdev->resource[PCI_ROM_RESOURCE].flags & IORESOURCE_ROM_SHADOW)
+ vgasr_priv.clients[index].active = true;
+
+ vgasr_priv.registered_clients |= (1 << index);
+
+ /* if we get two clients + handler */
+ if (vgasr_priv.registered_clients == 0x3 && vgasr_priv.handler) {
+ printk(KERN_INFO "vga_switcheroo: enabled\n");
+ vga_switcheroo_enable();
+ }
+ mutex_unlock(&vgasr_mutex);
+ return 0;
+}
+EXPORT_SYMBOL(vga_switcheroo_register_client);
+
+void vga_switcheroo_unregister_client(struct pci_dev *pdev)
+{
+ int i;
+
+ mutex_lock(&vgasr_mutex);
+ for (i = 0; i < VGA_SWITCHEROO_MAX_CLIENTS; i++) {
+ if (vgasr_priv.clients[i].pdev == pdev) {
+ vgasr_priv.registered_clients &= ~(1 << i);
+ break;
+ }
+ }
+
+ printk(KERN_INFO "vga_switcheroo: disabled\n");
+ vga_switcheroo_debugfs_fini(&vgasr_priv);
+ vgasr_priv.active = false;
+ mutex_unlock(&vgasr_mutex);
+}
+EXPORT_SYMBOL(vga_switcheroo_unregister_client);
+
+void vga_switcheroo_client_fb_set(struct pci_dev *pdev,
+ struct fb_info *info)
+{
+ int i;
+
+ mutex_lock(&vgasr_mutex);
+ for (i = 0; i < VGA_SWITCHEROO_MAX_CLIENTS; i++) {
+ if (vgasr_priv.clients[i].pdev == pdev) {
+ vgasr_priv.clients[i].fb_info = info;
+ break;
+ }
+ }
+ mutex_unlock(&vgasr_mutex);
+}
+EXPORT_SYMBOL(vga_switcheroo_client_fb_set);
+
+static int vga_switcheroo_show(struct seq_file *m, void *v)
+{
+ int i;
+ mutex_lock(&vgasr_mutex);
+ for (i = 0; i < VGA_SWITCHEROO_MAX_CLIENTS; i++) {
+ seq_printf(m, "%d:%c:%s:%s\n", i,
+ vgasr_priv.clients[i].active ? '+' : ' ',
+ vgasr_priv.clients[i].pwr_state ? "Pwr" : "Off",
+ pci_name(vgasr_priv.clients[i].pdev));
+ }
+ mutex_unlock(&vgasr_mutex);
+ return 0;
+}
+
+static int vga_switcheroo_debugfs_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, vga_switcheroo_show, NULL);
+}
+
+static int vga_switchon(struct vga_switcheroo_client *client)
+{
+ int ret;
+
+ ret = vgasr_priv.handler->power_state(client->id, VGA_SWITCHEROO_ON);
+ /* call the driver callback to turn on device */
+ client->set_gpu_state(client->pdev, VGA_SWITCHEROO_ON);
+ client->pwr_state = VGA_SWITCHEROO_ON;
+ return 0;
+}
+
+static int vga_switchoff(struct vga_switcheroo_client *client)
+{
+ /* call the driver callback to turn off device */
+ client->set_gpu_state(client->pdev, VGA_SWITCHEROO_OFF);
+ vgasr_priv.handler->power_state(client->id, VGA_SWITCHEROO_OFF);
+ client->pwr_state = VGA_SWITCHEROO_OFF;
+ return 0;
+}
+
+static int vga_switchto(struct vga_switcheroo_client *new_client)
+{
+ int ret;
+ int i;
+ struct vga_switcheroo_client *active = NULL;
+
+ if (new_client->active == true)
+ return 0;
+
+ for (i = 0; i < VGA_SWITCHEROO_MAX_CLIENTS; i++) {
+ if (vgasr_priv.clients[i].active == true) {
+ active = &vgasr_priv.clients[i];
+ break;
+ }
+ }
+ if (!active)
+ return 0;
+
+ /* power up the first device */
+ ret = pci_enable_device(new_client->pdev);
+ if (ret)
+ return ret;
+
+ if (new_client->pwr_state == VGA_SWITCHEROO_OFF)
+ vga_switchon(new_client);
+
+ /* swap shadow resource to denote boot VGA device has changed so X starts on new device */
+ active->active = false;
+
+ active->pdev->resource[PCI_ROM_RESOURCE].flags &= ~IORESOURCE_ROM_SHADOW;
+ new_client->pdev->resource[PCI_ROM_RESOURCE].flags |= IORESOURCE_ROM_SHADOW;
+
+ if (new_client->fb_info) {
+ struct fb_event event;
+ event.info = new_client->fb_info;
+ fb_notifier_call_chain(FB_EVENT_REMAP_ALL_CONSOLE, &event);
+ }
+
+ ret = vgasr_priv.handler->switchto(new_client->id);
+ if (ret)
+ return ret;
+
+ if (active->pwr_state == VGA_SWITCHEROO_ON)
+ vga_switchoff(active);
+
+ new_client->active = true;
+ return 0;
+}
+
+static ssize_t
+vga_switcheroo_debugfs_write(struct file *filp, const char __user *ubuf,
+ size_t cnt, loff_t *ppos)
+{
+ char usercmd[64];
+ const char *pdev_name;
+ int i, ret;
+ bool delay = false, can_switch;
+ int client_id = -1;
+ struct vga_switcheroo_client *client = NULL;
+
+ if (cnt > 63)
+ cnt = 63;
+
+ if (copy_from_user(usercmd, ubuf, cnt))
+ return -EFAULT;
+
+ mutex_lock(&vgasr_mutex);
+
+ if (!vgasr_priv.active)
+ return -EINVAL;
+
+ /* pwr off the device not in use */
+ if (strncmp(usercmd, "OFF", 3) == 0) {
+ for (i = 0; i < VGA_SWITCHEROO_MAX_CLIENTS; i++) {
+ if (vgasr_priv.clients[i].active)
+ continue;
+ if (vgasr_priv.clients[i].pwr_state == VGA_SWITCHEROO_ON)
+ vga_switchoff(&vgasr_priv.clients[i]);
+ }
+ goto out;
+ }
+ /* pwr on the device not in use */
+ if (strncmp(usercmd, "ON", 2) == 0) {
+ for (i = 0; i < VGA_SWITCHEROO_MAX_CLIENTS; i++) {
+ if (vgasr_priv.clients[i].active)
+ continue;
+ if (vgasr_priv.clients[i].pwr_state == VGA_SWITCHEROO_OFF)
+ vga_switchon(&vgasr_priv.clients[i]);
+ }
+ goto out;
+ }
+
+ /* request a delayed switch - test can we switch now */
+ if (strncmp(usercmd, "DIGD", 4) == 0) {
+ client_id = VGA_SWITCHEROO_IGD;
+ delay = true;
+ }
+
+ if (strncmp(usercmd, "DDIS", 4) == 0) {
+ client_id = VGA_SWITCHEROO_DIS;
+ delay = true;
+ }
+
+ if (strncmp(usercmd, "IGD", 3) == 0)
+ client_id = VGA_SWITCHEROO_IGD;
+
+ if (strncmp(usercmd, "DIS", 3) == 0)
+ client_id = VGA_SWITCHEROO_DIS;
+
+ if (client_id == -1)
+ goto out;
+
+ for (i = 0; i < VGA_SWITCHEROO_MAX_CLIENTS; i++) {
+ if (vgasr_priv.clients[i].id == client_id) {
+ client = &vgasr_priv.clients[i];
+ break;
+ }
+ }
+
+ vgasr_priv.delayed_switch_active = false;
+ /* 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(client);
+ if (ret)
+ printk(KERN_ERR "vga_switcheroo: switching failed %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;
+
+ /* we should at least power up the card to
+ make the switch faster */
+ if (client->pwr_state == VGA_SWITCHEROO_OFF)
+ vga_switchon(client);
+ }
+
+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(client);
+ if (ret)
+ printk(KERN_ERR "vga_switcheroo: delayed switching failed %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);
+