PCI, x86: Implement pcibios_alloc_irq() and pcibios_free_irq()

To support IOAPIC hotplug, we need to allocate PCI IRQ resources on demand
and free them when not used anymore.

Implement pcibios_alloc_irq() and pcibios_free_irq() to dynamically
allocate and free PCI IRQs.

Remove mp_should_keep_irq(), which is no longer used.

[bhelgaas: changelog]
Signed-off-by: Jiang Liu <jiang.liu@linux.intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Thomas Gleixner <tglx@linutronix.de>

diff --git a/arch/x86/include/asm/pci_x86.h b/arch/x86/include/asm/pci_x86.h
index 164e3f8d3c3dbb6eb4fc0ea60e01cae15fe5116e..fa1195dae42541aaa1d836782a3a65aa25640e74 100644 (file)
--- a/arch/x86/include/asm/pci_x86.h
+++ b/arch/x86/include/asm/pci_x86.h
@@ -93,8 +93,6 @@ extern raw_spinlock_t pci_config_lock;
 extern int (*pcibios_enable_irq)(struct pci_dev *dev);
 extern void (*pcibios_disable_irq)(struct pci_dev *dev);
 
-extern bool mp_should_keep_irq(struct device *dev);
-
 struct pci_raw_ops {
        int (*read)(unsigned int domain, unsigned int bus, unsigned int devfn,
                                                int reg, int len, u32 *val);

diff --git a/arch/x86/pci/common.c b/arch/x86/pci/common.c
index 8fd6f44aee8370958076fb4a8af3e13a2781fe33..dc78a4a9a46663f10600afd013d9230fe5fe222b 100644 (file)
--- a/arch/x86/pci/common.c
+++ b/arch/x86/pci/common.c
@@ -673,24 +673,22 @@ int pcibios_add_device(struct pci_dev *dev)
        return 0;
 }
 
-int pcibios_enable_device(struct pci_dev *dev, int mask)
+int pcibios_alloc_irq(struct pci_dev *dev)
 {
-       int err;
-
-       if ((err = pci_enable_resources(dev, mask)) < 0)
-               return err;
-
-       if (!pci_dev_msi_enabled(dev))
-               return pcibios_enable_irq(dev);
-       return 0;
+       return pcibios_enable_irq(dev);
 }
 
-void pcibios_disable_device (struct pci_dev *dev)
+void pcibios_free_irq(struct pci_dev *dev)
 {
-       if (!pci_dev_msi_enabled(dev) && pcibios_disable_irq)
+       if (pcibios_disable_irq)
                pcibios_disable_irq(dev);
 }
 
+int pcibios_enable_device(struct pci_dev *dev, int mask)
+{
+       return pci_enable_resources(dev, mask);
+}
+
 int pci_ext_cfg_avail(void)
 {
        if (raw_pci_ext_ops)

diff --git a/arch/x86/pci/intel_mid_pci.c b/arch/x86/pci/intel_mid_pci.c
index 27062303c88135b5d614455ed372861516903e53..fb7a1f96d80c554a6b888525d57342e96a1fcd38 100644 (file)
--- a/arch/x86/pci/intel_mid_pci.c
+++ b/arch/x86/pci/intel_mid_pci.c
@@ -234,10 +234,13 @@ static int intel_mid_pci_irq_enable(struct pci_dev *dev)
 
 static void intel_mid_pci_irq_disable(struct pci_dev *dev)
 {
-       if (!mp_should_keep_irq(&dev->dev) && dev->irq_managed &&
-           dev->irq > 0) {
+       if (dev->irq_managed && dev->irq > 0) {
                mp_unmap_irq(dev->irq);
                dev->irq_managed = 0;
+               /*
+                * Don't reset dev->irq here, otherwise
+                * intel_mid_pci_irq_enable() will fail on next call.
+                */
        }
 }
 

diff --git a/arch/x86/pci/irq.c b/arch/x86/pci/irq.c
index 9bd115484745703791c6515b289938546d2478ab..72108f0b66b10f8a2bd099d8e47aac7b05150b11 100644 (file)
--- a/arch/x86/pci/irq.c
+++ b/arch/x86/pci/irq.c
@@ -1257,22 +1257,9 @@ static int pirq_enable_irq(struct pci_dev *dev)
        return 0;
 }
 
-bool mp_should_keep_irq(struct device *dev)
-{
-       if (dev->power.is_prepared)
-               return true;
-#ifdef CONFIG_PM
-       if (dev->power.runtime_status == RPM_SUSPENDING)
-               return true;
-#endif
-
-       return false;
-}
-
 static void pirq_disable_irq(struct pci_dev *dev)
 {
-       if (io_apic_assign_pci_irqs && !mp_should_keep_irq(&dev->dev) &&
-           dev->irq_managed && dev->irq) {
+       if (io_apic_assign_pci_irqs && dev->irq_managed && dev->irq) {
                mp_unmap_irq(dev->irq);
                dev->irq = 0;
                dev->irq_managed = 0;

diff --git a/drivers/acpi/pci_irq.c b/drivers/acpi/pci_irq.c
index 304eccb0ae5cf32042885ceebb4f1feeae98adce..d1aad6900b4cec04afdd1aba83a716fbafad418c 100644 (file)
--- a/drivers/acpi/pci_irq.c
+++ b/drivers/acpi/pci_irq.c
@@ -484,14 +484,6 @@ void acpi_pci_irq_disable(struct pci_dev *dev)
        if (!pin || !dev->irq_managed || dev->irq <= 0)
                return;
 
-       /* Keep IOAPIC pin configuration when suspending */
-       if (dev->dev.power.is_prepared)
-               return;
-#ifdef CONFIG_PM
-       if (dev->dev.power.runtime_status == RPM_SUSPENDING)
-               return;
-#endif
-
        entry = acpi_pci_irq_lookup(dev, pin);
        if (!entry)
                return;
@@ -512,5 +504,6 @@ void acpi_pci_irq_disable(struct pci_dev *dev)
        if (gsi >= 0) {
                acpi_unregister_gsi(gsi);
                dev->irq_managed = 0;
+               dev->irq = 0;
        }
 }