Re: [Patch v2 3/4] PCI: Introduce helpers to manage pci_dev->irq and pci_dev->irq_managed

Bjorn Helgaas
2015-06-05T21:20:54Z

I'm on a campaign to squeeze more useful information into changelog
subjects. "Add" means the same as "Introduce" but leaves more space for
other useful information.

On Tue, Jun 02, 2015 at 10:49:18AM +0800, Jiang Liu wrote:
> Introduce three helpers to manage pci_dev->irq and pci_dev->irq_managed,
> which helps to improve maintenance.
>
> Signed-off-by: Jiang Liu <jiang.liu@linux.intel.com>
> ---
> arch/x86/pci/intel_mid_pci.c | 4 ++--
> arch/x86/pci/irq.c | 10 ++++------
> drivers/acpi/pci_irq.c | 10 ++++------
> include/linux/pci.h | 17 +++++++++++++++++
> 4 files changed, 27 insertions(+), 14 deletions(-)
>
> diff --git a/arch/x86/pci/intel_mid_pci.c b/arch/x86/pci/intel_mid_pci.c
> index fb7a1f96d80c..22aaefb4f1ca 100644
> --- a/arch/x86/pci/intel_mid_pci.c
> +++ b/arch/x86/pci/intel_mid_pci.c
> @@ -211,7 +211,7 @@ static int intel_mid_pci_irq_enable(struct pci_dev *dev)
> struct irq_alloc_info info;
> int polarity;
>
> - if (dev->irq_managed && dev->irq > 0)
> + if (pci_has_managed_irq(dev))
> return 0;
>
> if (intel_mid_identify_cpu() == INTEL_MID_CPU_CHIP_TANGIER)
> @@ -234,7 +234,7 @@ 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 (pci_has_managed_irq(dev)) {
> mp_unmap_irq(dev->irq);
> dev->irq_managed = 0;
> /*
> diff --git a/arch/x86/pci/irq.c b/arch/x86/pci/irq.c
> index 72108f0b66b1..32e70343e6fd 100644
> --- a/arch/x86/pci/irq.c
> +++ b/arch/x86/pci/irq.c
> @@ -1202,7 +1202,7 @@ static int pirq_enable_irq(struct pci_dev *dev)
> struct pci_dev *temp_dev;
> int irq;
>
> - if (dev->irq_managed && dev->irq > 0)
> + if (pci_has_managed_irq(dev))
> return 0;
>
> irq = IO_APIC_get_PCI_irq_vector(dev->bus->number,
> @@ -1230,8 +1230,7 @@ static int pirq_enable_irq(struct pci_dev *dev)
> }
> dev = temp_dev;
> if (irq >= 0) {
> - dev->irq_managed = 1;
> - dev->irq = irq;
> + pci_set_managed_irq(dev, irq);
> dev_info(&dev->dev, "PCI->APIC IRQ transform: "
> "INT %c -> IRQ %d\n", 'A' + pin - 1, irq);
> return 0;
> @@ -1259,9 +1258,8 @@ static int pirq_enable_irq(struct pci_dev *dev)
>
> 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 && pci_has_managed_irq(dev)) {
> mp_unmap_irq(dev->irq);
> - dev->irq = 0;
> - dev->irq_managed = 0;
> + pci_reset_managed_irq(dev);
> }
> }
> diff --git a/drivers/acpi/pci_irq.c b/drivers/acpi/pci_irq.c
> index e7f718d6918a..9d6343d02f7e 100644
> --- a/drivers/acpi/pci_irq.c
> +++ b/drivers/acpi/pci_irq.c
> @@ -413,7 +413,7 @@ int acpi_pci_irq_enable(struct pci_dev *dev)
> return 0;
> }
>
> - if (dev->irq_managed && dev->irq > 0)
> + if (pci_has_managed_irq(dev))
> return 0;
>
> entry = acpi_pci_irq_lookup(dev, pin);
> @@ -458,8 +458,7 @@ int acpi_pci_irq_enable(struct pci_dev *dev)
> kfree(entry);
> return rc;
> }
> - dev->irq = rc;
> - dev->irq_managed = 1;
> + pci_set_managed_irq(dev, rc);
>
> if (link)
> snprintf(link_desc, sizeof(link_desc), " -> Link[%s]", link);
> @@ -482,7 +481,7 @@ void acpi_pci_irq_disable(struct pci_dev *dev)
> u8 pin;
>
> pin = dev->pin;
> - if (!pin || !dev->irq_managed || dev->irq <= 0)
> + if (!pin || !pci_has_managed_irq(dev))
> return;
>
> entry = acpi_pci_irq_lookup(dev, pin);
> @@ -504,7 +503,6 @@ void acpi_pci_irq_disable(struct pci_dev *dev)
> dev_dbg(&dev->dev, "PCI INT %c disabled\n", pin_name(pin));
> if (gsi >= 0) {
> acpi_unregister_gsi(gsi);
> - dev->irq_managed = 0;
> - dev->irq = 0;
> + pci_reset_managed_irq(dev);
> }
> }
> diff --git a/include/linux/pci.h b/include/linux/pci.h
> index f50d16a04abc..4bc640eef76f 100644
> --- a/include/linux/pci.h
> +++ b/include/linux/pci.h
> @@ -958,6 +958,23 @@ static inline int pci_is_managed(struct pci_dev *pdev)
> return pdev->is_managed;
> }
>
> +static inline void pci_set_managed_irq(struct pci_dev *pdev, unsigned int irq)
> +{
> + pdev->irq = irq;
> + pdev->irq_managed = 1;
> +}
> +
> +static inline void pci_reset_managed_irq(struct pci_dev *pdev)
> +{
> + pdev->irq = 0;
> + pdev->irq_managed = 0;
> +}
> +
> +static inline bool pci_has_managed_irq(struct pci_dev *pdev)
> +{
> + return pdev->irq_managed && pdev->irq > 0;
> +}
> +
> void pci_disable_device(struct pci_dev *dev);
>
> extern unsigned int pcibios_max_latency;
> --
> 1.7.10.4
>