From: "Rafael J. Wysocki" <rjw@rjwysocki.net>
To: Thomas Gleixner <tglx@linutronix.de>
Cc: Peter Zijlstra <peterz@infradead.org>,
linux-kernel@vger.kernel.org,
Linux PM list <linux-pm@vger.kernel.org>,
Dmitry Torokhov <dtor@google.com>
Subject: [PATCH 5/5] PCI / PM: Make PCIe PME interrupts wake up from suspend-to-idle
Date: Tue, 05 Aug 2014 17:28:55 +0200 [thread overview]
Message-ID: <2711098.sybS8dER1z@vostro.rjw.lan> (raw)
In-Reply-To: <3321219.itH23ZEDt4@vostro.rjw.lan>
From: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
To make PCIe PME interrupts wake up the system from suspend to idle,
make the PME driver use enable_irq_wake() on the IRQ during system
suspend (if there are any wakeup devices below the given PCIe port)
without disabling PME interrupts. This way, an interrupt will still
trigger if a wakeup event happens and the system will be woken up (or
system suspend in progress will be aborted) by means of the new
mechanics introduced previously.
This change allows Wake-on-LAN to be used for wakeup from
suspend-to-idle on my MSI Wind tesbed netbook.
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---
drivers/pci/pcie/pme.c | 61 ++++++++++++++++++++++++++++++++++++++++---------
1 file changed, 51 insertions(+), 10 deletions(-)
Index: linux-pm/drivers/pci/pcie/pme.c
===================================================================
--- linux-pm.orig/drivers/pci/pcie/pme.c
+++ linux-pm/drivers/pci/pcie/pme.c
@@ -41,11 +41,17 @@ static int __init pcie_pme_setup(char *s
}
__setup("pcie_pme=", pcie_pme_setup);
+enum pme_suspend_level {
+ PME_SUSPEND_NONE = 0,
+ PME_SUSPEND_WAKEUP,
+ PME_SUSPEND_NOIRQ,
+};
+
struct pcie_pme_service_data {
spinlock_t lock;
struct pcie_device *srv;
struct work_struct work;
- bool noirq; /* Don't enable the PME interrupt used by this service. */
+ enum pme_suspend_level suspend_level;
};
/**
@@ -223,7 +229,7 @@ static void pcie_pme_work_fn(struct work
spin_lock_irq(&data->lock);
for (;;) {
- if (data->noirq)
+ if (data->suspend_level != PME_SUSPEND_NONE)
break;
pcie_capability_read_dword(port, PCI_EXP_RTSTA, &rtsta);
@@ -250,7 +256,7 @@ static void pcie_pme_work_fn(struct work
spin_lock_irq(&data->lock);
}
- if (!data->noirq)
+ if (data->suspend_level == PME_SUSPEND_NONE)
pcie_pme_interrupt_enable(port, true);
spin_unlock_irq(&data->lock);
@@ -367,6 +373,21 @@ static int pcie_pme_probe(struct pcie_de
return ret;
}
+static bool pcie_pme_check_wakeup(struct pci_bus *bus)
+{
+ struct pci_dev *dev;
+
+ if (!bus)
+ return false;
+
+ list_for_each_entry(dev, &bus->devices, bus_list)
+ if (device_may_wakeup(&dev->dev)
+ || pcie_pme_check_wakeup(dev->subordinate))
+ return true;
+
+ return false;
+}
+
/**
* pcie_pme_suspend - Suspend PCIe PME service device.
* @srv: PCIe service device to suspend.
@@ -375,11 +396,26 @@ static int pcie_pme_suspend(struct pcie_
{
struct pcie_pme_service_data *data = get_service_data(srv);
struct pci_dev *port = srv->port;
+ bool wakeup;
+ if (device_may_wakeup(&port->dev)) {
+ wakeup = true;
+ } else {
+ down_read(&pci_bus_sem);
+ wakeup = pcie_pme_check_wakeup(port->subordinate);
+ up_read(&pci_bus_sem);
+ }
spin_lock_irq(&data->lock);
- pcie_pme_interrupt_enable(port, false);
- pcie_clear_root_pme_status(port);
- data->noirq = true;
+ if (wakeup) {
+ enable_irq_wake(srv->irq);
+ data->suspend_level = PME_SUSPEND_WAKEUP;
+ } else {
+ struct pci_dev *port = srv->port;
+
+ pcie_pme_interrupt_enable(port, false);
+ pcie_clear_root_pme_status(port);
+ data->suspend_level = PME_SUSPEND_NOIRQ;
+ }
spin_unlock_irq(&data->lock);
synchronize_irq(srv->irq);
@@ -394,12 +430,17 @@ static int pcie_pme_suspend(struct pcie_
static int pcie_pme_resume(struct pcie_device *srv)
{
struct pcie_pme_service_data *data = get_service_data(srv);
- struct pci_dev *port = srv->port;
spin_lock_irq(&data->lock);
- data->noirq = false;
- pcie_clear_root_pme_status(port);
- pcie_pme_interrupt_enable(port, true);
+ if (data->suspend_level == PME_SUSPEND_NOIRQ) {
+ struct pci_dev *port = srv->port;
+
+ pcie_clear_root_pme_status(port);
+ pcie_pme_interrupt_enable(port, true);
+ } else {
+ disable_irq_wake(srv->irq);
+ }
+ data->suspend_level = PME_SUSPEND_NONE;
spin_unlock_irq(&data->lock);
return 0;
next prev parent reply other threads:[~2014-08-05 15:11 UTC|newest]
Thread overview: 73+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-07-24 21:26 [RFC][PATCH] irq: Rework IRQF_NO_SUSPENDED Peter Zijlstra
2014-07-24 22:02 ` Rafael J. Wysocki
2014-07-24 23:10 ` Rafael J. Wysocki
2014-07-25 5:58 ` Peter Zijlstra
2014-07-29 19:20 ` Brian Norris
2014-07-29 19:28 ` Peter Zijlstra
2014-07-29 20:41 ` Brian Norris
2014-07-25 9:27 ` Thomas Gleixner
2014-07-25 12:49 ` Rafael J. Wysocki
2014-07-25 13:55 ` Thomas Gleixner
2014-07-25 9:40 ` Thomas Gleixner
2014-07-25 12:40 ` Peter Zijlstra
2014-07-25 13:25 ` Peter Zijlstra
2014-07-25 17:03 ` Rafael J. Wysocki
2014-07-25 16:58 ` Peter Zijlstra
2014-07-25 21:00 ` Thomas Gleixner
2014-07-25 22:25 ` Rafael J. Wysocki
2014-07-25 23:07 ` Rafael J. Wysocki
2014-07-26 11:49 ` Rafael J. Wysocki
2014-07-26 11:53 ` Rafael J. Wysocki
2014-07-28 6:49 ` Peter Zijlstra
2014-07-28 12:33 ` Thomas Gleixner
2014-07-28 13:04 ` Peter Zijlstra
2014-07-28 21:53 ` Rafael J. Wysocki
2014-07-28 23:01 ` Rafael J. Wysocki
2014-07-29 12:46 ` Thomas Gleixner
2014-07-29 13:33 ` Rafael J. Wysocki
2014-07-30 21:46 ` [PATCH 0/3] irq / PM: wakeup interrupt interface for drivers (was: Re: [RFC][PATCH] irq: Rework IRQF_NO_SUSPENDED) Rafael J. Wysocki
2014-07-30 21:51 ` [PATCH 1/3] irq / PM: New driver interface for wakeup interrupts Rafael J. Wysocki
2014-07-30 22:56 ` Thomas Gleixner
2014-07-31 0:12 ` Thomas Gleixner
2014-07-31 2:14 ` Rafael J. Wysocki
2014-07-31 10:44 ` Thomas Gleixner
2014-07-31 18:36 ` Rafael J. Wysocki
2014-07-31 20:12 ` Alan Stern
2014-07-31 21:04 ` Rafael J. Wysocki
2014-07-31 23:41 ` Thomas Gleixner
2014-08-01 0:51 ` Rafael J. Wysocki
2014-08-01 14:41 ` Alan Stern
2014-07-31 22:16 ` Thomas Gleixner
2014-08-01 0:08 ` Rafael J. Wysocki
2014-08-01 1:24 ` Rafael J. Wysocki
2014-08-01 9:40 ` [PATCH 1/3] irq / PM: New driver interface for wakeup interruptsn Thomas Gleixner
2014-08-01 13:45 ` Rafael J. Wysocki
2014-08-01 13:43 ` Thomas Gleixner
2014-08-01 14:29 ` Rafael J. Wysocki
2014-08-02 1:31 ` Rafael J. Wysocki
2014-08-03 13:42 ` Rafael J. Wysocki
2014-08-04 3:38 ` Rafael J. Wysocki
2014-08-05 15:22 ` [PATCH 0/5] irq / PM: Shared IRQs vs IRQF_NO_SUSPEND and suspend-to-idle wakeup Rafael J. Wysocki
2014-08-05 15:24 ` [PATCH 1/5] PM / sleep: Mechanism for aborting system suspends unconditionally Rafael J. Wysocki
2014-08-05 23:29 ` [Update][PATCH " Rafael J. Wysocki
2014-08-05 15:25 ` [PATCH 2/5] irq / PM: Fix IRQF_NO_SUSPEND problem with shared interrupts Rafael J. Wysocki
2014-08-05 15:26 ` [PATCH 3/5] irq / PM: Make wakeup interrupts wake up from suspend-to-idle Rafael J. Wysocki
2014-08-08 1:58 ` [Update][PATCH " Rafael J. Wysocki
2014-08-09 0:28 ` Rafael J. Wysocki
2014-08-05 15:27 ` [PATCH 4/5] x86 / PM: Set IRQCHIP_SKIP_SET_WAKE for IOAPIC IRQ chip objects Rafael J. Wysocki
2014-08-05 15:28 ` Rafael J. Wysocki [this message]
2014-08-05 16:12 ` [PATCH 0/5] irq / PM: Shared IRQs vs IRQF_NO_SUSPEND and suspend-to-idle wakeup Peter Zijlstra
2014-08-08 2:09 ` Rafael J. Wysocki
2014-07-31 22:54 ` [PATCH 1/3] irq / PM: New driver interface for wakeup interrupts Thomas Gleixner
2014-07-30 21:51 ` [PATCH 2/3] PCI / PM: Make PCIe PME interrupts wake up from "freeze" sleep state Rafael J. Wysocki
2014-07-30 21:52 ` [PATCH 3/3] gpio-keys / PM: use enable/disable_device_irq_wake() Rafael J. Wysocki
2014-07-28 21:27 ` [RFC][PATCH] irq: Rework IRQF_NO_SUSPENDED Rafael J. Wysocki
2014-07-27 15:53 ` Rafael J. Wysocki
2014-07-27 22:00 ` [PATCH, v2] Rafael J. Wysocki
2014-07-28 12:11 ` Thomas Gleixner
2014-07-28 21:17 ` [PATCH, v3] irq / PM: Fix IRQF_NO_SUSPEND problem with shared interrupts (was: Re: [PATCH, v2]) Rafael J. Wysocki
2014-07-29 7:28 ` [PATCH, v4] irq / PM: Fix IRQF_NO_SUSPEND problem with shared interrupts Rafael J. Wysocki
2014-07-29 13:46 ` [PATCH, v5] " Rafael J. Wysocki
2014-07-30 0:54 ` [PATCH, v6] " Rafael J. Wysocki
2014-07-25 12:47 ` [RFC][PATCH] irq: Rework IRQF_NO_SUSPENDED Rafael J. Wysocki
2014-07-25 13:22 ` Peter Zijlstra
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