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authorLinus Torvalds <torvalds@linux-foundation.org>2010-02-26 17:22:53 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2010-02-26 17:22:53 -0800
commit06a79b82b2a3e4bebb9a20638ca208c780e9e507 (patch)
tree594a11b60ba56d7ae62f8affa4cd61836e70e4b1 /drivers
parent4912002fffa377e66c5caefc2c311732a4ad5fb8 (diff)
parenta9c9b4429df437982d2fbfab1f4b46b01329e9ed (diff)
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/suspend-2.6
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/suspend-2.6: PM / Hibernate: Fix preallocating of memory PM / Hibernate: Remove swsusp.c finally PM / Hibernate: Remove trailing space in message PM: Allow SCSI devices to suspend/resume asynchronously PM: Allow USB devices to suspend/resume asynchronously USB: implement non-tree resume ordering constraints for PCI host controllers PM: Allow PCI devices to suspend/resume asynchronously PM / Hibernate: Swap, remove useless check from swsusp_read() PM / Hibernate: Really deprecate deprecated user ioctls PM: Allow device drivers to use dpm_wait() PM: Start asynchronous resume threads upfront PM: Add facility for advanced testing of async suspend/resume PM: Add a switch for disabling/enabling asynchronous suspend/resume PM: Asynchronous suspend and resume of devices PM: Add parent information to timing messages PM: Document device power attributes in sysfs PM / Runtime: Add sysfs switch for disabling device run-time PM
Diffstat (limited to 'drivers')
-rw-r--r--drivers/base/power/main.c143
-rw-r--r--drivers/base/power/power.h6
-rw-r--r--drivers/base/power/runtime.c45
-rw-r--r--drivers/base/power/sysfs.c100
-rw-r--r--drivers/pci/pci.c1
-rw-r--r--drivers/pci/pcie/portdrv_core.c1
-rw-r--r--drivers/pci/probe.c1
-rw-r--r--drivers/scsi/hosts.c4
-rw-r--r--drivers/scsi/scsi_sysfs.c4
-rw-r--r--drivers/usb/core/driver.c8
-rw-r--r--drivers/usb/core/endpoint.c1
-rw-r--r--drivers/usb/core/hcd-pci.c127
-rw-r--r--drivers/usb/core/hub.c1
-rw-r--r--drivers/usb/core/message.c1
14 files changed, 428 insertions, 15 deletions
diff --git a/drivers/base/power/main.c b/drivers/base/power/main.c
index a5142bddef4..0e26a6f6fd4 100644
--- a/drivers/base/power/main.c
+++ b/drivers/base/power/main.c
@@ -25,6 +25,7 @@
#include <linux/resume-trace.h>
#include <linux/interrupt.h>
#include <linux/sched.h>
+#include <linux/async.h>
#include "../base.h"
#include "power.h"
@@ -42,6 +43,7 @@
LIST_HEAD(dpm_list);
static DEFINE_MUTEX(dpm_list_mtx);
+static pm_message_t pm_transition;
/*
* Set once the preparation of devices for a PM transition has started, reset
@@ -56,6 +58,7 @@ static bool transition_started;
void device_pm_init(struct device *dev)
{
dev->power.status = DPM_ON;
+ init_completion(&dev->power.completion);
pm_runtime_init(dev);
}
@@ -111,6 +114,7 @@ void device_pm_remove(struct device *dev)
pr_debug("PM: Removing info for %s:%s\n",
dev->bus ? dev->bus->name : "No Bus",
kobject_name(&dev->kobj));
+ complete_all(&dev->power.completion);
mutex_lock(&dpm_list_mtx);
list_del_init(&dev->power.entry);
mutex_unlock(&dpm_list_mtx);
@@ -188,6 +192,31 @@ static void initcall_debug_report(struct device *dev, ktime_t calltime,
}
/**
+ * dpm_wait - Wait for a PM operation to complete.
+ * @dev: Device to wait for.
+ * @async: If unset, wait only if the device's power.async_suspend flag is set.
+ */
+static void dpm_wait(struct device *dev, bool async)
+{
+ if (!dev)
+ return;
+
+ if (async || (pm_async_enabled && dev->power.async_suspend))
+ wait_for_completion(&dev->power.completion);
+}
+
+static int dpm_wait_fn(struct device *dev, void *async_ptr)
+{
+ dpm_wait(dev, *((bool *)async_ptr));
+ return 0;
+}
+
+static void dpm_wait_for_children(struct device *dev, bool async)
+{
+ device_for_each_child(dev, &async, dpm_wait_fn);
+}
+
+/**
* pm_op - Execute the PM operation appropriate for given PM event.
* @dev: Device to handle.
* @ops: PM operations to choose from.
@@ -271,8 +300,9 @@ static int pm_noirq_op(struct device *dev,
ktime_t calltime, delta, rettime;
if (initcall_debug) {
- pr_info("calling %s_i+ @ %i\n",
- dev_name(dev), task_pid_nr(current));
+ pr_info("calling %s+ @ %i, parent: %s\n",
+ dev_name(dev), task_pid_nr(current),
+ dev->parent ? dev_name(dev->parent) : "none");
calltime = ktime_get();
}
@@ -468,16 +498,20 @@ static int legacy_resume(struct device *dev, int (*cb)(struct device *dev))
* device_resume - Execute "resume" callbacks for given device.
* @dev: Device to handle.
* @state: PM transition of the system being carried out.
+ * @async: If true, the device is being resumed asynchronously.
*/
-static int device_resume(struct device *dev, pm_message_t state)
+static int device_resume(struct device *dev, pm_message_t state, bool async)
{
int error = 0;
TRACE_DEVICE(dev);
TRACE_RESUME(0);
+ dpm_wait(dev->parent, async);
down(&dev->sem);
+ dev->power.status = DPM_RESUMING;
+
if (dev->bus) {
if (dev->bus->pm) {
pm_dev_dbg(dev, state, "");
@@ -510,11 +544,29 @@ static int device_resume(struct device *dev, pm_message_t state)
}
End:
up(&dev->sem);
+ complete_all(&dev->power.completion);
TRACE_RESUME(error);
return error;
}
+static void async_resume(void *data, async_cookie_t cookie)
+{
+ struct device *dev = (struct device *)data;
+ int error;
+
+ error = device_resume(dev, pm_transition, true);
+ if (error)
+ pm_dev_err(dev, pm_transition, " async", error);
+ put_device(dev);
+}
+
+static bool is_async(struct device *dev)
+{
+ return dev->power.async_suspend && pm_async_enabled
+ && !pm_trace_is_enabled();
+}
+
/**
* dpm_resume - Execute "resume" callbacks for non-sysdev devices.
* @state: PM transition of the system being carried out.
@@ -525,21 +577,33 @@ static int device_resume(struct device *dev, pm_message_t state)
static void dpm_resume(pm_message_t state)
{
struct list_head list;
+ struct device *dev;
ktime_t starttime = ktime_get();
INIT_LIST_HEAD(&list);
mutex_lock(&dpm_list_mtx);
- while (!list_empty(&dpm_list)) {
- struct device *dev = to_device(dpm_list.next);
+ pm_transition = state;
+
+ list_for_each_entry(dev, &dpm_list, power.entry) {
+ if (dev->power.status < DPM_OFF)
+ continue;
+
+ INIT_COMPLETION(dev->power.completion);
+ if (is_async(dev)) {
+ get_device(dev);
+ async_schedule(async_resume, dev);
+ }
+ }
+ while (!list_empty(&dpm_list)) {
+ dev = to_device(dpm_list.next);
get_device(dev);
- if (dev->power.status >= DPM_OFF) {
+ if (dev->power.status >= DPM_OFF && !is_async(dev)) {
int error;
- dev->power.status = DPM_RESUMING;
mutex_unlock(&dpm_list_mtx);
- error = device_resume(dev, state);
+ error = device_resume(dev, state, false);
mutex_lock(&dpm_list_mtx);
if (error)
@@ -554,6 +618,7 @@ static void dpm_resume(pm_message_t state)
}
list_splice(&list, &dpm_list);
mutex_unlock(&dpm_list_mtx);
+ async_synchronize_full();
dpm_show_time(starttime, state, NULL);
}
@@ -731,17 +796,24 @@ static int legacy_suspend(struct device *dev, pm_message_t state,
return error;
}
+static int async_error;
+
/**
* device_suspend - Execute "suspend" callbacks for given device.
* @dev: Device to handle.
* @state: PM transition of the system being carried out.
+ * @async: If true, the device is being suspended asynchronously.
*/
-static int device_suspend(struct device *dev, pm_message_t state)
+static int __device_suspend(struct device *dev, pm_message_t state, bool async)
{
int error = 0;
+ dpm_wait_for_children(dev, async);
down(&dev->sem);
+ if (async_error)
+ goto End;
+
if (dev->class) {
if (dev->class->pm) {
pm_dev_dbg(dev, state, "class ");
@@ -772,12 +844,44 @@ static int device_suspend(struct device *dev, pm_message_t state)
error = legacy_suspend(dev, state, dev->bus->suspend);
}
}
+
+ if (!error)
+ dev->power.status = DPM_OFF;
+
End:
up(&dev->sem);
+ complete_all(&dev->power.completion);
return error;
}
+static void async_suspend(void *data, async_cookie_t cookie)
+{
+ struct device *dev = (struct device *)data;
+ int error;
+
+ error = __device_suspend(dev, pm_transition, true);
+ if (error) {
+ pm_dev_err(dev, pm_transition, " async", error);
+ async_error = error;
+ }
+
+ put_device(dev);
+}
+
+static int device_suspend(struct device *dev)
+{
+ INIT_COMPLETION(dev->power.completion);
+
+ if (pm_async_enabled && dev->power.async_suspend) {
+ get_device(dev);
+ async_schedule(async_suspend, dev);
+ return 0;
+ }
+
+ return __device_suspend(dev, pm_transition, false);
+}
+
/**
* dpm_suspend - Execute "suspend" callbacks for all non-sysdev devices.
* @state: PM transition of the system being carried out.
@@ -790,13 +894,15 @@ static int dpm_suspend(pm_message_t state)
INIT_LIST_HEAD(&list);
mutex_lock(&dpm_list_mtx);
+ pm_transition = state;
+ async_error = 0;
while (!list_empty(&dpm_list)) {
struct device *dev = to_device(dpm_list.prev);
get_device(dev);
mutex_unlock(&dpm_list_mtx);
- error = device_suspend(dev, state);
+ error = device_suspend(dev);
mutex_lock(&dpm_list_mtx);
if (error) {
@@ -804,13 +910,17 @@ static int dpm_suspend(pm_message_t state)
put_device(dev);
break;
}
- dev->power.status = DPM_OFF;
if (!list_empty(&dev->power.entry))
list_move(&dev->power.entry, &list);
put_device(dev);
+ if (async_error)
+ break;
}
list_splice(&list, dpm_list.prev);
mutex_unlock(&dpm_list_mtx);
+ async_synchronize_full();
+ if (!error)
+ error = async_error;
if (!error)
dpm_show_time(starttime, state, NULL);
return error;
@@ -936,3 +1046,14 @@ void __suspend_report_result(const char *function, void *fn, int ret)
printk(KERN_ERR "%s(): %pF returns %d\n", function, fn, ret);
}
EXPORT_SYMBOL_GPL(__suspend_report_result);
+
+/**
+ * device_pm_wait_for_dev - Wait for suspend/resume of a device to complete.
+ * @dev: Device to wait for.
+ * @subordinate: Device that needs to wait for @dev.
+ */
+void device_pm_wait_for_dev(struct device *subordinate, struct device *dev)
+{
+ dpm_wait(dev, subordinate->power.async_suspend);
+}
+EXPORT_SYMBOL_GPL(device_pm_wait_for_dev);
diff --git a/drivers/base/power/power.h b/drivers/base/power/power.h
index b8fa1aa5225..c0bd03c83b9 100644
--- a/drivers/base/power/power.h
+++ b/drivers/base/power/power.h
@@ -12,10 +12,10 @@ static inline void pm_runtime_remove(struct device *dev) {}
#ifdef CONFIG_PM_SLEEP
-/*
- * main.c
- */
+/* kernel/power/main.c */
+extern int pm_async_enabled;
+/* drivers/base/power/main.c */
extern struct list_head dpm_list; /* The active device list */
static inline struct device *to_device(struct list_head *entry)
diff --git a/drivers/base/power/runtime.c b/drivers/base/power/runtime.c
index f8b044e8aef..626dd147b75 100644
--- a/drivers/base/power/runtime.c
+++ b/drivers/base/power/runtime.c
@@ -1011,6 +1011,50 @@ void pm_runtime_enable(struct device *dev)
EXPORT_SYMBOL_GPL(pm_runtime_enable);
/**
+ * pm_runtime_forbid - Block run-time PM of a device.
+ * @dev: Device to handle.
+ *
+ * Increase the device's usage count and clear its power.runtime_auto flag,
+ * so that it cannot be suspended at run time until pm_runtime_allow() is called
+ * for it.
+ */
+void pm_runtime_forbid(struct device *dev)
+{
+ spin_lock_irq(&dev->power.lock);
+ if (!dev->power.runtime_auto)
+ goto out;
+
+ dev->power.runtime_auto = false;
+ atomic_inc(&dev->power.usage_count);
+ __pm_runtime_resume(dev, false);
+
+ out:
+ spin_unlock_irq(&dev->power.lock);
+}
+EXPORT_SYMBOL_GPL(pm_runtime_forbid);
+
+/**
+ * pm_runtime_allow - Unblock run-time PM of a device.
+ * @dev: Device to handle.
+ *
+ * Decrease the device's usage count and set its power.runtime_auto flag.
+ */
+void pm_runtime_allow(struct device *dev)
+{
+ spin_lock_irq(&dev->power.lock);
+ if (dev->power.runtime_auto)
+ goto out;
+
+ dev->power.runtime_auto = true;
+ if (atomic_dec_and_test(&dev->power.usage_count))
+ __pm_runtime_idle(dev);
+
+ out:
+ spin_unlock_irq(&dev->power.lock);
+}
+EXPORT_SYMBOL_GPL(pm_runtime_allow);
+
+/**
* pm_runtime_init - Initialize run-time PM fields in given device object.
* @dev: Device object to initialize.
*/
@@ -1028,6 +1072,7 @@ void pm_runtime_init(struct device *dev)
atomic_set(&dev->power.child_count, 0);
pm_suspend_ignore_children(dev, false);
+ dev->power.runtime_auto = true;
dev->power.request_pending = false;
dev->power.request = RPM_REQ_NONE;
diff --git a/drivers/base/power/sysfs.c b/drivers/base/power/sysfs.c
index 596aeecfdff..86fd9373447 100644
--- a/drivers/base/power/sysfs.c
+++ b/drivers/base/power/sysfs.c
@@ -4,9 +4,25 @@
#include <linux/device.h>
#include <linux/string.h>
+#include <linux/pm_runtime.h>
#include "power.h"
/*
+ * control - Report/change current runtime PM setting of the device
+ *
+ * Runtime power management of a device can be blocked with the help of
+ * this attribute. All devices have one of the following two values for
+ * the power/control file:
+ *
+ * + "auto\n" to allow the device to be power managed at run time;
+ * + "on\n" to prevent the device from being power managed at run time;
+ *
+ * The default for all devices is "auto", which means that devices may be
+ * subject to automatic power management, depending on their drivers.
+ * Changing this attribute to "on" prevents the driver from power managing
+ * the device at run time. Doing that while the device is suspended causes
+ * it to be woken up.
+ *
* wakeup - Report/change current wakeup option for device
*
* Some devices support "wakeup" events, which are hardware signals
@@ -38,11 +54,61 @@
* wakeup events internally (unless they are disabled), keeping
* their hardware in low power modes whenever they're unused. This
* saves runtime power, without requiring system-wide sleep states.
+ *
+ * async - Report/change current async suspend setting for the device
+ *
+ * Asynchronous suspend and resume of the device during system-wide power
+ * state transitions can be enabled by writing "enabled" to this file.
+ * Analogously, if "disabled" is written to this file, the device will be
+ * suspended and resumed synchronously.
+ *
+ * All devices have one of the following two values for power/async:
+ *
+ * + "enabled\n" to permit the asynchronous suspend/resume of the device;
+ * + "disabled\n" to forbid it;
+ *
+ * NOTE: It generally is unsafe to permit the asynchronous suspend/resume
+ * of a device unless it is certain that all of the PM dependencies of the
+ * device are known to the PM core. However, for some devices this
+ * attribute is set to "enabled" by bus type code or device drivers and in
+ * that cases it should be safe to leave the default value.
*/
static const char enabled[] = "enabled";
static const char disabled[] = "disabled";
+#ifdef CONFIG_PM_RUNTIME
+static const char ctrl_auto[] = "auto";
+static const char ctrl_on[] = "on";
+
+static ssize_t control_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ return sprintf(buf, "%s\n",
+ dev->power.runtime_auto ? ctrl_auto : ctrl_on);
+}
+
+static ssize_t control_store(struct device * dev, struct device_attribute *attr,
+ const char * buf, size_t n)
+{
+ char *cp;
+ int len = n;
+
+ cp = memchr(buf, '\n', n);
+ if (cp)
+ len = cp - buf;
+ if (len == sizeof ctrl_auto - 1 && strncmp(buf, ctrl_auto, len) == 0)
+ pm_runtime_allow(dev);
+ else if (len == sizeof ctrl_on - 1 && strncmp(buf, ctrl_on, len) == 0)
+ pm_runtime_forbid(dev);
+ else
+ return -EINVAL;
+ return n;
+}
+
+static DEVICE_ATTR(control, 0644, control_show, control_store);
+#endif
+
static ssize_t
wake_show(struct device * dev, struct device_attribute *attr, char * buf)
{
@@ -77,9 +143,43 @@ wake_store(struct device * dev, struct device_attribute *attr,
static DEVICE_ATTR(wakeup, 0644, wake_show, wake_store);
+#ifdef CONFIG_PM_SLEEP_ADVANCED_DEBUG
+static ssize_t async_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ return sprintf(buf, "%s\n",
+ device_async_suspend_enabled(dev) ? enabled : disabled);
+}
+
+static ssize_t async_store(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t n)
+{
+ char *cp;
+ int len = n;
+
+ cp = memchr(buf, '\n', n);
+ if (cp)
+ len = cp - buf;
+ if (len == sizeof enabled - 1 && strncmp(buf, enabled, len) == 0)
+ device_enable_async_suspend(dev);
+ else if (len == sizeof disabled - 1 && strncmp(buf, disabled, len) == 0)
+ device_disable_async_suspend(dev);
+ else
+ return -EINVAL;
+ return n;
+}
+
+static DEVICE_ATTR(async, 0644, async_show, async_store);
+#endif /* CONFIG_PM_SLEEP_ADVANCED_DEBUG */
static struct attribute * power_attrs[] = {
+#ifdef CONFIG_PM_RUNTIME
+ &dev_attr_control.attr,
+#endif
&dev_attr_wakeup.attr,
+#ifdef CONFIG_PM_SLEEP_ADVANCED_DEBUG
+ &dev_attr_async.attr,
+#endif
NULL,
};
static struct attribute_group pm_attr_group = {
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index f4a2738bf0b..2b9ac9e594a 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -1540,6 +1540,7 @@ void pci_pm_init(struct pci_dev *dev)
int pm;
u16 pmc;
+ device_enable_async_suspend(&dev->dev);
dev->wakeup_prepared = false;
dev->pm_cap = 0;
diff --git a/drivers/pci/pcie/portdrv_core.c b/drivers/pci/pcie/portdrv_core.c
index 0d34ff41539..e73effbe402 100644
--- a/drivers/pci/pcie/portdrv_core.c
+++ b/drivers/pci/pcie/portdrv_core.c
@@ -285,6 +285,7 @@ static int pcie_device_init(struct pci_dev *pdev, int service, int irq)
pci_name(pdev),
get_descriptor_id(pdev->pcie_type, service));
device->parent = &pdev->dev;
+ device_enable_async_suspend(device);
retval = device_register(device);
if (retval)
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 270d069819f..2a943090a3b 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -1436,6 +1436,7 @@ struct pci_bus * pci_create_bus(struct device *parent,
if (error)
goto dev_reg_err;
b->bridge = get_device(dev);
+ device_enable_async_suspend(b->bridge);
if (!parent)
set_dev_node(b->bridge, pcibus_to_node(b));
diff --git a/drivers/scsi/hosts.c b/drivers/scsi/hosts.c
index 554626e1806..09dbcb847b7 100644
--- a/drivers/scsi/hosts.c
+++ b/drivers/scsi/hosts.c
@@ -215,6 +215,8 @@ int scsi_add_host_with_dma(struct Scsi_Host *shost, struct device *dev,
shost->shost_gendev.parent = dev ? dev : &platform_bus;
shost->dma_dev = dma_dev;
+ device_enable_async_suspend(&shost->shost_gendev);
+
error = device_add(&shost->shost_gendev);
if (error)
goto out;
@@ -222,6 +224,8 @@ int scsi_add_host_with_dma(struct Scsi_Host *shost, struct device *dev,
scsi_host_set_state(shost, SHOST_RUNNING);
get_device(shost->shost_gendev.parent);
+ device_enable_async_suspend(&shost->shost_dev);
+
error = device_add(&shost->shost_dev);
if (error)
goto out_del_gendev;
diff --git a/drivers/scsi/scsi_sysfs.c b/drivers/scsi/scsi_sysfs.c
index a4936c4e2f4..19ec9e2d3f3 100644
--- a/drivers/scsi/scsi_sysfs.c
+++ b/drivers/scsi/scsi_sysfs.c
@@ -847,6 +847,8 @@ static int scsi_target_add(struct scsi_target *starget)
if (starget->state != STARGET_CREATED)
return 0;
+ device_enable_async_suspend(&starget->dev);
+
error = device_add(&starget->dev);
if (error) {
dev_err(&starget->dev, "target device_add failed, error %d\n", error);
@@ -887,11 +889,13 @@ int scsi_sysfs_add_sdev(struct scsi_device *sdev)
return error;
transport_configure_device(&starget->dev);
+ device_enable_async_suspend(&sdev->sdev_gendev);
error = device_add(&sdev->sdev_gendev);
if (error) {
printk(KERN_INFO "error 1\n");
return error;
}
+ device_enable_async_suspend(&sdev->sdev_dev);
error = device_add(&sdev->sdev_dev);
if (error) {
printk(KERN_INFO "error 2\n");
diff --git a/drivers/usb/core/driver.c b/drivers/usb/core/driver.c
index 60a45f1e3a6..f2f055eb683 100644
--- a/drivers/usb/core/driver.c
+++ b/drivers/usb/core/driver.c
@@ -1022,6 +1022,14 @@ static int usb_resume_device(struct usb_device *udev, pm_message_t msg)
goto done;
}
+ /* Non-root devices on a full/low-speed bus must wait for their
+ * companion high-speed root hub, in case a handoff is needed.
+ */
+ if (!(msg.event & PM_EVENT_AUTO) && udev->parent &&
+ udev->bus->hs_companion)
+ device_pm_wait_for_dev(&udev->dev,
+ &udev->bus->hs_companion->root_hub->dev);
+
if (udev->quirks & USB_QUIRK_RESET_RESUME)
udev->reset_resume = 1;
diff --git a/drivers/usb/core/endpoint.c b/drivers/usb/core/endpoint.c
index fdfaa788551..d26b9ea981f 100644
--- a/drivers/usb/core/endpoint.c
+++ b/drivers/usb/core/endpoint.c
@@ -186,6 +186,7 @@ int usb_create_ep_devs(struct device *parent,
ep_dev->dev.parent = parent;
ep_dev->dev.release = ep_device_release;
dev_set_name(&ep_dev->dev, "ep_%02x", endpoint->desc.bEndpointAddress);
+ device_enable_async_suspend(&ep_dev->dev);
retval = device_register(&ep_dev->dev);
if (retval)
diff --git a/drivers/usb/core/hcd-pci.c b/drivers/usb/core/hcd-pci.c
index 2dcf906df56..15286533c15 100644
--- a/drivers/usb/core/hcd-pci.c
+++ b/drivers/usb/core/hcd-pci.c
@@ -19,6 +19,7 @@
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/pci.h>
+#include <linux/pm_runtime.h>
#include <linux/usb.h>
#include <asm/io.h>
@@ -37,6 +38,122 @@
/* PCI-based HCs are common, but plenty of non-PCI HCs are used too */
+#ifdef CONFIG_PM_SLEEP
+
+/* Coordinate handoffs between EHCI and companion controllers
+ * during system resume
+ */
+
+static DEFINE_MUTEX(companions_mutex);
+
+#define CL_UHCI PCI_CLASS_SERIAL_USB_UHCI
+#define CL_OHCI PCI_CLASS_SERIAL_USB_OHCI
+#define CL_EHCI PCI_CLASS_SERIAL_USB_EHCI
+
+enum companion_action {
+ SET_HS_COMPANION, CLEAR_HS_COMPANION, WAIT_FOR_COMPANIONS
+};
+
+static void companion_common(struct pci_dev *pdev, struct usb_hcd *hcd,
+ enum companion_action action)
+{
+ struct pci_dev *companion;
+ struct usb_hcd *companion_hcd;
+ unsigned int slot = PCI_SLOT(pdev->devfn);
+
+ /* Iterate through other PCI functions in the same slot.
+ * If pdev is OHCI or UHCI then we are looking for EHCI, and
+ * vice versa.
+ */
+ companion = NULL;
+ for (;;) {
+ companion = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, companion);
+ if (!companion)
+ break;
+ if (companion->bus != pdev->bus ||
+ PCI_SLOT(companion->devfn) != slot)
+ continue;
+
+ companion_hcd = pci_get_drvdata(companion);
+ if (!companion_hcd)
+ continue;
+
+ /* For SET_HS_COMPANION, store a pointer to the EHCI bus in
+ * the OHCI/UHCI companion bus structure.
+ * For CLEAR_HS_COMPANION, clear the pointer to the EHCI bus
+ * in the OHCI/UHCI companion bus structure.
+ * For WAIT_FOR_COMPANIONS, wait until the OHCI/UHCI
+ * companion controllers have fully resumed.
+ */
+
+ if ((pdev->class == CL_OHCI || pdev->class == CL_UHCI) &&
+ companion->class == CL_EHCI) {
+ /* action must be SET_HS_COMPANION */
+ dev_dbg(&companion->dev, "HS companion for %s\n",
+ dev_name(&pdev->dev));
+ hcd->self.hs_companion = &companion_hcd->self;
+
+ } else if (pdev->class == CL_EHCI &&
+ (companion->class == CL_OHCI ||
+ companion->class == CL_UHCI)) {
+ switch (action) {
+ case SET_HS_COMPANION:
+ dev_dbg(&pdev->dev, "HS companion for %s\n",
+ dev_name(&companion->dev));
+ companion_hcd->self.hs_companion = &hcd->self;
+ break;
+ case CLEAR_HS_COMPANION:
+ companion_hcd->self.hs_companion = NULL;
+ break;
+ case WAIT_FOR_COMPANIONS:
+ device_pm_wait_for_dev(&pdev->dev,
+ &companion->dev);
+ break;
+ }
+ }
+ }
+}
+
+static void set_hs_companion(struct pci_dev *pdev, struct usb_hcd *hcd)
+{
+ mutex_lock(&companions_mutex);
+ dev_set_drvdata(&pdev->dev, hcd);
+ companion_common(pdev, hcd, SET_HS_COMPANION);
+ mutex_unlock(&companions_mutex);
+}
+
+static void clear_hs_companion(struct pci_dev *pdev, struct usb_hcd *hcd)
+{
+ mutex_lock(&companions_mutex);
+ dev_set_drvdata(&pdev->dev, NULL);
+
+ /* If pdev is OHCI or UHCI, just clear its hs_companion pointer */
+ if (pdev->class == CL_OHCI || pdev->class == CL_UHCI)
+ hcd->self.hs_companion = NULL;
+
+ /* Otherwise search for companion buses and clear their pointers */
+ else
+ companion_common(pdev, hcd, CLEAR_HS_COMPANION);
+ mutex_unlock(&companions_mutex);
+}
+
+static void wait_for_companions(struct pci_dev *pdev, struct usb_hcd *hcd)
+{
+ /* Only EHCI controllers need to wait.
+ * No locking is needed because a controller cannot be resumed
+ * while one of its companions is getting unbound.
+ */
+ if (pdev->class == CL_EHCI)
+ companion_common(pdev, hcd, WAIT_FOR_COMPANIONS);
+}
+
+#else /* !CONFIG_PM_SLEEP */
+
+static inline void set_hs_companion(struct pci_dev *d, struct usb_hcd *h) {}
+static inline void clear_hs_companion(struct pci_dev *d, struct usb_hcd *h) {}
+static inline void wait_for_companions(struct pci_dev *d, struct usb_hcd *h) {}
+
+#endif /* !CONFIG_PM_SLEEP */
/*-------------------------------------------------------------------------*/
@@ -123,7 +240,7 @@ int usb_hcd_pci_probe(struct pci_dev *dev, const struct pci_device_id *id)
if (region == PCI_ROM_RESOURCE) {
dev_dbg(&dev->dev, "no i/o regions available\n");
retval = -EBUSY;
- goto err1;
+ goto err2;
}
}
@@ -132,6 +249,7 @@ int usb_hcd_pci_probe(struct pci_dev *dev, const struct pci_device_id *id)
retval = usb_add_hcd(hcd, dev->irq, IRQF_DISABLED | IRQF_SHARED);
if (retval != 0)
goto err4;
+ set_hs_companion(dev, hcd);
return retval;
err4:
@@ -142,6 +260,7 @@ int usb_hcd_pci_probe(struct pci_dev *dev, const struct pci_device_id *id)
} else
release_region(hcd->rsrc_start, hcd->rsrc_len);
err2:
+ clear_hs_companion(dev, hcd);
usb_put_hcd(hcd);
err1:
pci_disable_device(dev);
@@ -180,6 +299,7 @@ void usb_hcd_pci_remove(struct pci_dev *dev)
} else {
release_region(hcd->rsrc_start, hcd->rsrc_len);
}
+ clear_hs_companion(dev, hcd);
usb_put_hcd(hcd);
pci_disable_device(dev);
}
@@ -344,6 +464,11 @@ static int resume_common(struct device *dev, bool hibernated)
clear_bit(HCD_FLAG_SAW_IRQ, &hcd->flags);
if (hcd->driver->pci_resume) {
+ /* This call should be made only during system resume,
+ * not during runtime resume.
+ */
+ wait_for_companions(pci_dev, hcd);
+
retval = hcd->driver->pci_resume(hcd, hibernated);
if (retval) {
dev_err(dev, "PCI post-resume error %d!\n", retval);
diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
index 35cc8b9ba1f..20ecb4cec8d 100644
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -1817,6 +1817,7 @@ int usb_new_device(struct usb_device *udev)
/* Tell the world! */
announce_device(udev);
+ device_enable_async_suspend(&udev->dev);
/* Register the device. The device driver is responsible
* for configuring the device and invoking the add-device
* notifier chain (used by usbfs and possibly others).
diff --git a/drivers/usb/core/message.c b/drivers/usb/core/message.c
index 9bc95fec793..df73574a9cc 100644
--- a/drivers/usb/core/message.c
+++ b/drivers/usb/core/message.c
@@ -1867,6 +1867,7 @@ free_interfaces:
"adding %s (config #%d, interface %d)\n",
dev_name(&intf->dev), configuration,
intf->cur_altsetting->desc.bInterfaceNumber);
+ device_enable_async_suspend(&intf->dev);
ret = device_add(&intf->dev);
if (ret != 0) {
dev_err(&dev->dev, "device_add(%s) --> %d\n",