x86/PCI: Refine the way to release PCI IRQ resources
Some PCI device drivers assume that pci_dev->irq won't change after calling pci_disable_device() and pci_enable_device() during suspend and resume. Commitc03b3b0738
("x86, irq, mpparse: Release IOAPIC pin when PCI device is disabled") frees PCI IRQ resources when pci_disable_device() is called and reallocate IRQ resources when pci_enable_device() is called again. This breaks above assumption. So commit3eec595235
("x86, irq, PCI: Keep IRQ assignment for PCI devices during suspend/hibernation") and9eabc99a63
("x86, irq, PCI: Keep IRQ assignment for runtime power management") fix the issue by avoiding freeing/reallocating IRQ resources during PCI device suspend/resume. They achieve this by checking dev.power.is_prepared and dev.power.runtime_status. PM maintainer, Rafael, then pointed out that it's really an ugly fix which leaking PM internal state information to IRQ subsystem. Recently David Vrabel <david.vrabel@citrix.com> also reports an regression in pciback driver caused by commitcffe0a2b5a
("x86, irq: Keep balance of IOAPIC pin reference count"). Please refer to: http://lkml.org/lkml/2015/1/14/546 So this patch refine the way to release PCI IRQ resources. Instead of releasing PCI IRQ resources in pci_disable_device()/ pcibios_disable_device(), we now release it at driver unbinding notification BUS_NOTIFY_UNBOUND_DRIVER. In other word, we only release PCI IRQ resources when there's no driver bound to the PCI device, and it keeps the assumption that pci_dev->irq won't through multiple invocation of pci_enable_device()/pci_disable_device(). Signed-off-by: Jiang Liu <jiang.liu@linux.intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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@ -93,8 +93,6 @@ extern raw_spinlock_t pci_config_lock;
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extern int (*pcibios_enable_irq)(struct pci_dev *dev);
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extern void (*pcibios_disable_irq)(struct pci_dev *dev);
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extern bool mp_should_keep_irq(struct device *dev);
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struct pci_raw_ops {
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int (*read)(unsigned int domain, unsigned int bus, unsigned int devfn,
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int reg, int len, u32 *val);
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@ -497,6 +497,31 @@ void __init pcibios_set_cache_line_size(void)
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}
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}
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/*
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* Some device drivers assume dev->irq won't change after calling
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* pci_disable_device(). So delay releasing of IRQ resource to driver
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* unbinding time. Otherwise it will break PM subsystem and drivers
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* like xen-pciback etc.
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*/
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static int pci_irq_notifier(struct notifier_block *nb, unsigned long action,
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void *data)
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{
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struct pci_dev *dev = to_pci_dev(data);
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if (action != BUS_NOTIFY_UNBOUND_DRIVER)
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return NOTIFY_DONE;
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if (pcibios_disable_irq)
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pcibios_disable_irq(dev);
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return NOTIFY_OK;
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}
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static struct notifier_block pci_irq_nb = {
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.notifier_call = pci_irq_notifier,
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.priority = INT_MIN,
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};
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int __init pcibios_init(void)
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{
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if (!raw_pci_ops) {
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@ -509,6 +534,9 @@ int __init pcibios_init(void)
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if (pci_bf_sort >= pci_force_bf)
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pci_sort_breadthfirst();
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bus_register_notifier(&pci_bus_type, &pci_irq_nb);
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return 0;
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}
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@ -667,12 +695,6 @@ int pcibios_enable_device(struct pci_dev *dev, int mask)
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return 0;
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}
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void pcibios_disable_device (struct pci_dev *dev)
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{
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if (!pci_dev_msi_enabled(dev) && pcibios_disable_irq)
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pcibios_disable_irq(dev);
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}
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int pci_ext_cfg_avail(void)
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{
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if (raw_pci_ext_ops)
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@ -234,10 +234,10 @@ static int intel_mid_pci_irq_enable(struct pci_dev *dev)
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static void intel_mid_pci_irq_disable(struct pci_dev *dev)
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{
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if (!mp_should_keep_irq(&dev->dev) && dev->irq_managed &&
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dev->irq > 0) {
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if (dev->irq_managed && dev->irq > 0) {
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mp_unmap_irq(dev->irq);
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dev->irq_managed = 0;
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dev->irq = 0;
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}
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}
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@ -1256,22 +1256,9 @@ static int pirq_enable_irq(struct pci_dev *dev)
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return 0;
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}
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bool mp_should_keep_irq(struct device *dev)
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{
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if (dev->power.is_prepared)
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return true;
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#ifdef CONFIG_PM
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if (dev->power.runtime_status == RPM_SUSPENDING)
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return true;
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#endif
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return false;
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}
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static void pirq_disable_irq(struct pci_dev *dev)
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{
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if (io_apic_assign_pci_irqs && !mp_should_keep_irq(&dev->dev) &&
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dev->irq_managed && dev->irq) {
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if (io_apic_assign_pci_irqs && dev->irq_managed && dev->irq) {
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mp_unmap_irq(dev->irq);
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dev->irq = 0;
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dev->irq_managed = 0;
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@ -485,14 +485,6 @@ void acpi_pci_irq_disable(struct pci_dev *dev)
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if (!pin || !dev->irq_managed || dev->irq <= 0)
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return;
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/* Keep IOAPIC pin configuration when suspending */
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if (dev->dev.power.is_prepared)
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return;
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#ifdef CONFIG_PM
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if (dev->dev.power.runtime_status == RPM_SUSPENDING)
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return;
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#endif
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entry = acpi_pci_irq_lookup(dev, pin);
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if (!entry)
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return;
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@ -513,5 +505,6 @@ void acpi_pci_irq_disable(struct pci_dev *dev)
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if (gsi >= 0) {
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acpi_unregister_gsi(gsi);
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dev->irq_managed = 0;
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dev->irq = 0;
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}
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}
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