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

991de2e59090 ("PCI, x86: Implement pcibios_alloc_irq() and
pcibios_free_irq()") appeared in v4.3 and helps support IOAPIC hotplug.

Олег reported that the Elcus-1553 TA1-PCI driver worked in v4.2 but not
v4.3 and bisected it to 991de2e59090.  Sunjin reported that the RocketRAID
272x driver worked in v4.2 but not v4.3.  In both cases booting with
"pci=routirq" is a workaround.

I think the problem is that after 991de2e59090, we no longer call
pcibios_enable_irq() for upstream bridges.  Prior to 991de2e59090, when a
driver called pci_enable_device(), we recursively called
pcibios_enable_irq() for upstream bridges via pci_enable_bridge().

After 991de2e59090, we call pcibios_enable_irq() from pci_device_probe()
instead of the pci_enable_device() path, which does *not* call
pcibios_enable_irq() for upstream bridges.

Revert 991de2e59090 to fix these driver regressions.

Link: https://bugzilla.kernel.org/show_bug.cgi?id=111211
Fixes: 991de2e59090 ("PCI, x86: Implement pcibios_alloc_irq() and pcibios_free_irq()")
Reported-and-tested-by: Олег Мороз <oleg.moroz@mcc.vniiem.ru>
Reported-by: Sunjin Yang <fan4326@gmail.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Rafael J. Wysocki <rafael@kernel.org>
CC: Jiang Liu <jiang.liu@linux.intel.com>

diff --git a/arch/x86/include/asm/pci_x86.h b/arch/x86/include/asm/pci_x86.h
index 46873fbd44e1b522b5d40ad5ebf963714df566a1..d08eacd298c2f4b2436b9841203dd5c90f295697 100644 (file)
--- a/arch/x86/include/asm/pci_x86.h
+++ b/arch/x86/include/asm/pci_x86.h
@@ -93,6 +93,8 @@ 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 cb499c5b6ae54781c027cb9713741a4e2113cdd0..d34b5118b4e8e7a30c55d722733d03b00bade013 100644 (file)
--- a/arch/x86/pci/common.c
+++ b/arch/x86/pci/common.c
@@ -711,20 +711,22 @@ int pcibios_add_device(struct pci_dev *dev)
        return 0;
 }
 
-int pcibios_alloc_irq(struct pci_dev *dev)
+int pcibios_enable_device(struct pci_dev *dev, int mask)
 {
-       return pcibios_enable_irq(dev);
-}
+       int err;
 
-void pcibios_free_irq(struct pci_dev *dev)
-{
-       if (pcibios_disable_irq)
-               pcibios_disable_irq(dev);
+       if ((err = pci_enable_resources(dev, mask)) < 0)
+               return err;
+
+       if (!pci_dev_msi_enabled(dev))
+               return pcibios_enable_irq(dev);
+       return 0;
 }
 
-int pcibios_enable_device(struct pci_dev *dev, int mask)
+void pcibios_disable_device (struct pci_dev *dev)
 {
-       return pci_enable_resources(dev, mask);
+       if (!pci_dev_msi_enabled(dev) && pcibios_disable_irq)
+               pcibios_disable_irq(dev);
 }
 
 int pci_ext_cfg_avail(void)

diff --git a/arch/x86/pci/intel_mid_pci.c b/arch/x86/pci/intel_mid_pci.c
index 8826ff593ebcfe5eed793fe5f06157d6757fff77..8b93e634af84c4698e6f7c6ab718a018e2cdc9db 100644 (file)
--- a/arch/x86/pci/intel_mid_pci.c
+++ b/arch/x86/pci/intel_mid_pci.c
@@ -256,13 +256,10 @@ static int intel_mid_pci_irq_enable(struct pci_dev *dev)
 
 static void intel_mid_pci_irq_disable(struct pci_dev *dev)
 {
-       if (dev->irq_managed && dev->irq > 0) {
+       if (!mp_should_keep_irq(&dev->dev) && 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 72108f0b66b10f8a2bd099d8e47aac7b05150b11..9bd115484745703791c6515b289938546d2478ab 100644 (file)
--- a/arch/x86/pci/irq.c
+++ b/arch/x86/pci/irq.c
@@ -1257,9 +1257,22 @@ 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 && dev->irq_managed && dev->irq) {
+       if (io_apic_assign_pci_irqs && !mp_should_keep_irq(&dev->dev) &&
+           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 9032db7e4b3a5a63d9140936a686a66dd4f76ea4..c8e169e46673ae253882872cda7a94249540c3a5 100644 (file)
--- a/drivers/acpi/pci_irq.c
+++ b/drivers/acpi/pci_irq.c
@@ -478,6 +478,14 @@ 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;
@@ -498,6 +506,5 @@ void acpi_pci_irq_disable(struct pci_dev *dev)
        if (gsi >= 0) {
                acpi_unregister_gsi(gsi);
                dev->irq_managed = 0;
-               dev->irq = 0;
        }
 }