diff options
Diffstat (limited to 'drivers/pci/irq.c')
| -rw-r--r-- | drivers/pci/irq.c | 61 |
1 files changed, 60 insertions, 1 deletions
diff --git a/drivers/pci/irq.c b/drivers/pci/irq.c index f9f2a0324ecc..83d30953ce19 100644 --- a/drivers/pci/irq.c +++ b/drivers/pci/irq.c @@ -1,7 +1,8 @@ /* - * PCI IRQ failure handing code + * PCI IRQ handling code * * Copyright (c) 2008 James Bottomley <James.Bottomley@HansenPartnership.com> + * Copyright (C) 2017 Christoph Hellwig. */ #include <linux/acpi.h> @@ -59,3 +60,61 @@ enum pci_lost_interrupt_reason pci_lost_interrupt(struct pci_dev *pdev) return PCI_LOST_IRQ_NO_INFORMATION; } EXPORT_SYMBOL(pci_lost_interrupt); + +/** + * pci_request_irq - allocate an interrupt line for a PCI device + * @dev: PCI device to operate on + * @nr: device-relative interrupt vector index (0-based). + * @handler: Function to be called when the IRQ occurs. + * Primary handler for threaded interrupts. + * If NULL and thread_fn != NULL the default primary handler is + * installed. + * @thread_fn: Function called from the IRQ handler thread + * If NULL, no IRQ thread is created + * @dev_id: Cookie passed back to the handler function + * @fmt: Printf-like format string naming the handler + * + * This call allocates interrupt resources and enables the interrupt line and + * IRQ handling. From the point this call is made @handler and @thread_fn may + * be invoked. All interrupts requested using this function might be shared. + * + * @dev_id must not be NULL and must be globally unique. + */ +int pci_request_irq(struct pci_dev *dev, unsigned int nr, irq_handler_t handler, + irq_handler_t thread_fn, void *dev_id, const char *fmt, ...) +{ + va_list ap; + int ret; + char *devname; + + va_start(ap, fmt); + devname = kvasprintf(GFP_KERNEL, fmt, ap); + va_end(ap); + + ret = request_threaded_irq(pci_irq_vector(dev, nr), handler, thread_fn, + IRQF_SHARED, devname, dev_id); + if (ret) + kfree(devname); + return ret; +} +EXPORT_SYMBOL(pci_request_irq); + +/** + * pci_free_irq - free an interrupt allocated with pci_request_irq + * @dev: PCI device to operate on + * @nr: device-relative interrupt vector index (0-based). + * @dev_id: Device identity to free + * + * Remove an interrupt handler. The handler is removed and if the interrupt + * line is no longer in use by any driver it is disabled. The caller must + * ensure the interrupt is disabled on the device before calling this function. + * The function does not return until any executing interrupts for this IRQ + * have completed. + * + * This function must not be called from interrupt context. + */ +void pci_free_irq(struct pci_dev *dev, unsigned int nr, void *dev_id) +{ + kfree(free_irq(pci_irq_vector(dev, nr), dev_id)); +} +EXPORT_SYMBOL(pci_free_irq); |