Re: [PATCH] Restore mux and power states after resume from hibernation

On Mon, 28 Oct 2013, Stefan Demharter stefan.demharter@gmx.net wrote:

Hi all,

i've got a system with a muxed intel+ati card and had a problem with hibernation: Vgaswitcheroo didn't restore the states of the graphics cards and the state of the mux after resume.

I have solved the issue with the attached patch.

Can you please review it?

I see that Daniel asked for the patch to be sent here in [1]. Thanks, and sorry that it's been neglected!

I did not look at the patch either (not really my area of expertise) but please consider sending the patch in proper patch format (with Signed-off-by, see Documentation/SubmittingPatches), and do pay attention to Documentation/CodingStyle (at least wrt comments and having a newline after if (cond)). This might help you get the review.

Thanks, Jani.

[1] https://bugs.freedesktop.org/show_bug.cgi?id=70863

Regards Stefan commit cd8f863a804d9388b09771640110577dddafc695 Author: Stefan Demharter stefan.demharter@gmx.net Date: Thu Oct 24 00:06:09 2013 +0200

vgaswitcheroo: restore mux and power states after resume from hibernation.

diff --git a/drivers/gpu/vga/vga_switcheroo.c b/drivers/gpu/vga/vga_switcheroo.c index ec0ae2d..4731f02 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 +73,46 @@ static struct vgasr_priv vgasr_priv = { .clients = LIST_HEAD_INIT(vgasr_priv.clients), };

+/* save state of mux to restore it upon hibernation resume */ +// Assume initial state after boot: mux is set to IGD +#define MUX_POWER_ON_STATE VGA_SWITCHEROO_IGD +static int mux_id = MUX_POWER_ON_STATE;

+static int vga_switchoff(struct vga_switcheroo_client *client);

+static int vga_resume(struct notifier_block *nb,

•                            unsigned long val, void *ign)
  

+{

• int ret = 0;
• struct vga_switcheroo_client *client;
• pr_info("vga_switcheroo: vga_resume %d %d %d\n", (int)val, PM_POST_HIBERNATION, mux_id);
• if (val != PM_POST_HIBERNATION) return 0;
• if (mux_id != VGA_SWITCHEROO_IGD) {

• mutex_lock(&vgasr_mutex);
  

• pr_info("vga_switcheroo: restoring switch to %d after hibernate\n", mux_id);
  

• // Restore mux state
  

• if (mux_id != MUX_POWER_ON_STATE)
  

• 	ret = vgasr_priv.handler->switchto(mux_id);
  

• // Restore power state
  

• // Assumes all gpus have power after boot
  

• list_for_each_entry(client, &vgasr_priv.clients, list) {
  

• 	if (!client->pwr_state) {
  

• 		// Device was powered off, so we redo that...
  

• 		pr_info("vga_switcheroo: restoring power off of device %d after hibernate\n", client->id);
  

• 		vga_switchoff(client);
  

• 	}
  

• }
  

• mutex_unlock(&vgasr_mutex);
  

• if (ret) pr_warn("vga_switcheroo: failed\n");
  

• }
• return 0;

+}

+static struct notifier_block vga_pm_nb = {

• .notifier_call = vga_resume,
• .priority = 0,

+};

static bool vga_switcheroo_ready(void) { /* we're ready if we get two clients + handler */ @@ -83,6 +124,7 @@ static void vga_switcheroo_enable(void) { int ret; struct vga_switcheroo_client *client;

• register_pm_notifier(&vga_pm_nb);

  /* call the handler to init */ if (vgasr_priv.handler->init)

@@ -119,14 +161,21 @@ int vga_switcheroo_register_handler(struct vga_switcheroo_handler *handler) } EXPORT_SYMBOL(vga_switcheroo_register_handler);

+// vgasr_mutex has to be locked from caller +void vga_switcheroo_disable(void) +{

• unregister_pm_notifier(&vga_pm_nb);
• pr_info("vga_switcheroo: disabled\n");
• vga_switcheroo_debugfs_fini(&vgasr_priv);
• vgasr_priv.active = false;

+}

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);

} @@ -235,9 +284,7 @@ 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);

} @@ -262,12 +309,13 @@ 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->driver_power_control ? "Dyn" : "",
     client->pwr_state ? "Pwr" : "Off",
  

• 	   client_id(client) == mux_id ? "mux" : "",
     pci_name(client->pdev));
  

  i++; }

@@ -304,6 +352,15 @@ static int vga_switchoff(struct vga_switcheroo_client *client) return 0; }

+static int vga_switch_mux_to(int client_id) +{

• int ret = vgasr_priv.handler->switchto(client_id);
• if (ret == 0) {

• mux_id = client_id;
  

• }
• return ret;

+}

static void set_audio_state(int id, int state) { struct vga_switcheroo_client *client; @@ -353,7 +410,7 @@ static int vga_switchto_stage2(struct vga_switcheroo_client *new_client) console_unlock(); }

• ret = vgasr_priv.handler->switchto(new_client->id);

• ret = vga_switch_mux_to(new_client->id); if (ret) return ret;

@@ -468,7 +525,7 @@ 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_switch_mux_to(client_id);
  

  goto out; }

---

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