On Thu, Jan 30, 2014 at 6:46 PM, Stefan Demharter stefan.demharter@gmx.net wrote:
Saves the current state of the mux and restores it upon resume from hibernation. This is needed for muxed systems because the state of the mux doesn't survive a hibernation-resume cycle. Furthermore also restores the power state of a GPU to OFF after resume from hibernation if it was OFF before hibernation.
Signed-off-by: Stefan Demharter stefan.demharter@gmx.net
Reviewed-by: Alex Deucher alexander.deucher@amd.com
drivers/gpu/vga/vga_switcheroo.c | 96 +++++++++++++++++++++++++++++++++++----- 1 file changed, 85 insertions(+), 11 deletions(-)
diff --git a/drivers/gpu/vga/vga_switcheroo.c b/drivers/gpu/vga/vga_switcheroo.c index ec0ae2d..85f41b9 100644 --- a/drivers/gpu/vga/vga_switcheroo.c +++ b/drivers/gpu/vga/vga_switcheroo.c @@ -28,6 +28,7 @@ #include <linux/console.h> #include <linux/vga_switcheroo.h> #include <linux/pm_runtime.h> +#include <linux/suspend.h>
#include <linux/vgaarb.h>
@@ -72,6 +73,64 @@ static struct vgasr_priv vgasr_priv = { .clients = LIST_HEAD_INIT(vgasr_priv.clients), };
+#define MUX_STATE_UNDEFINED (-1) +/*
- The next variable stores the state of the mux
- so it can be restored upon resume from hibernation.
- */
+static int mux_state = MUX_STATE_UNDEFINED;
+static void vga_restore_mux(void) +{
if (mux_state != MUX_STATE_UNDEFINED) {int ret;pr_info("vga_switcheroo: restoring mux state to %s\n",mux_state == VGA_SWITCHEROO_IGD ? "IGD" : "DIS");ret = vgasr_priv.handler->switchto(mux_state);if (ret)pr_warn("vga_switcheroo: mux switch failed (%d)\n", ret);}+}
+static void vga_restore_power_state(void) +{
struct vga_switcheroo_client *client;if (!vgasr_priv.handler->power_state)return;list_for_each_entry(client, &vgasr_priv.clients, list) {if (client_is_vga(client) && client->pwr_state == VGA_SWITCHEROO_OFF) {pr_info("vga_switcheroo: setting power state of %s to OFF\n",client->id == VGA_SWITCHEROO_IGD ? "IGD" : "DIS");vgasr_priv.handler->power_state(client->id, client->pwr_state);}}+}
+/*
- Handle resume from hibernation:
- Restore mux state and power states for switcheroo controlled GPUs.
- */
+static int vga_resume(struct notifier_block *nb, unsigned long action, void *unused) +{
switch (action) {case PM_POST_HIBERNATION:mutex_lock(&vgasr_mutex);vga_restore_mux();vga_restore_power_state();mutex_unlock(&vgasr_mutex);break;}return 0;+}
+static struct notifier_block vga_switcheroo_pm_nb = {
.notifier_call = vga_resume,.priority = 0,+};
static bool vga_switcheroo_ready(void) { /* we're ready if we get two clients + handler */ @@ -84,6 +143,8 @@ static void vga_switcheroo_enable(void) int ret; struct vga_switcheroo_client *client;
pr_info("vga_switcheroo: enabled\n");/* call the handler to init */ if (vgasr_priv.handler->init) vgasr_priv.handler->init();@@ -99,6 +160,15 @@ static void vga_switcheroo_enable(void) } vga_switcheroo_debugfs_init(&vgasr_priv); vgasr_priv.active = true;
register_pm_notifier(&vga_switcheroo_pm_nb);+}
+void vga_switcheroo_disable(void) +{
unregister_pm_notifier(&vga_switcheroo_pm_nb);vgasr_priv.active = false;vga_switcheroo_debugfs_fini(&vgasr_priv);pr_info("vga_switcheroo: disabled\n");}
int vga_switcheroo_register_handler(struct vga_switcheroo_handler *handler) @@ -111,7 +181,6 @@ 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"); vga_switcheroo_enable(); } mutex_unlock(&vgasr_mutex);@@ -124,9 +193,7 @@ void vga_switcheroo_unregister_handler(void) mutex_lock(&vgasr_mutex); vgasr_priv.handler = NULL; if (vgasr_priv.active) {
pr_info("vga_switcheroo: disabled\n");vga_switcheroo_debugfs_fini(&vgasr_priv);vgasr_priv.active = false;
vga_switcheroo_disable(); } mutex_unlock(&vgasr_mutex);} @@ -155,7 +222,6 @@ static int register_client(struct pci_dev *pdev, vgasr_priv.registered_clients++;
if (vga_switcheroo_ready()) {
printk(KERN_INFO "vga_switcheroo: enabled\n"); vga_switcheroo_enable(); } mutex_unlock(&vgasr_mutex);@@ -235,9 +301,7 @@ 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");vga_switcheroo_debugfs_fini(&vgasr_priv);vgasr_priv.active = false;
vga_switcheroo_disable(); } mutex_unlock(&vgasr_mutex);} @@ -262,10 +326,11 @@ static int vga_switcheroo_show(struct seq_file *m, void *v) 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,
seq_printf(m, "%d:%s%s:%c%s:%s%s:%s\n", i, client_id(client) == VGA_SWITCHEROO_DIS ? "DIS" : "IGD", client_is_vga(client) ? "" : "-Audio", client->active ? '+' : ' ',client_id(client) == mux_state ? "mux" : "", client->driver_power_control ? "Dyn" : "", client->pwr_state ? "Pwr" : "Off", pci_name(client->pdev));@@ -304,6 +369,15 @@ static int vga_switchoff(struct vga_switcheroo_client *client) return 0; }
+static int vga_switchto(int client_id) +{
int ret = vgasr_priv.handler->switchto(client_id);if (ret == 0)mux_state = client_id;return ret;+}
static void set_audio_state(int id, int state) { struct vga_switcheroo_client *client; @@ -353,7 +427,7 @@ static int vga_switchto_stage2(struct vga_switcheroo_client *new_client) console_unlock(); }
ret = vgasr_priv.handler->switchto(new_client->id);
ret = vga_switchto(new_client->id); if (ret) return ret;@@ -468,7 +542,7 @@ vga_switcheroo_debugfs_write(struct file *filp, const char __user *ubuf, vgasr_priv.delayed_switch_active = false;
if (just_mux) {
ret = vgasr_priv.handler->switchto(client_id);
ret = vga_switchto(client_id); goto out; }-- 1.8.5.3
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