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-rw-r--r--drivers/pci/irq.c76
1 files changed, 76 insertions, 0 deletions
diff --git a/drivers/pci/irq.c b/drivers/pci/irq.c
new file mode 100644
index 0000000000..0050e8f681
--- /dev/null
+++ b/drivers/pci/irq.c
@@ -0,0 +1,76 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * PCI IRQ handling code
+ *
+ * Copyright (c) 2008 James Bottomley <James.Bottomley@HansenPartnership.com>
+ * Copyright (C) 2017 Christoph Hellwig.
+ */
+
+#include <linux/device.h>
+#include <linux/kernel.h>
+#include <linux/export.h>
+#include <linux/pci.h>
+
+/**
+ * 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;
+ unsigned long irqflags = IRQF_SHARED;
+
+ if (!handler)
+ irqflags |= IRQF_ONESHOT;
+
+ va_start(ap, fmt);
+ devname = kvasprintf(GFP_KERNEL, fmt, ap);
+ va_end(ap);
+ if (!devname)
+ return -ENOMEM;
+
+ ret = request_threaded_irq(pci_irq_vector(dev, nr), handler, thread_fn,
+ irqflags, 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);