140 lines
3.5 KiB
C
140 lines
3.5 KiB
C
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/*-
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* Copyright (c) 2010 Isilon Systems, Inc.
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* Copyright (c) 2010 iX Systems, Inc.
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* Copyright (c) 2010 Panasas, Inc.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice unmodified, this list of conditions, and the following
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* disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _LINUX_INTERRUPT_H_
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#define _LINUX_INTERRUPT_H_
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#include <linux/device.h>
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#include <linux/pci.h>
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#include <sys/bus.h>
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#include <sys/rman.h>
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typedef irqreturn_t (*irq_handler_t)(int, void *);
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#define IRQ_RETVAL(x) ((x) != IRQ_NONE)
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#define IRQF_SHARED RF_SHAREABLE
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struct irq_ent {
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struct list_head links;
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struct device *dev;
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struct resource *res;
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void *arg;
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irqreturn_t (*handler)(int, void *);
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void *tag;
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int irq;
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};
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static inline int
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_irq_rid(struct device *dev, int irq)
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{
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if (irq == dev->irq)
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return (0);
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return irq - dev->msix + 1;
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}
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static void
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_irq_handler(void *ent)
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{
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struct irq_ent *irqe;
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irqe = ent;
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irqe->handler(irqe->irq, irqe->arg);
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}
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static inline struct irq_ent *
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_irq_ent(struct device *dev, int irq)
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{
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struct irq_ent *irqe;
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list_for_each_entry(irqe, &dev->irqents, links)
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if (irqe->irq == irq)
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return (irqe);
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return (NULL);
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}
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static inline int
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request_irq(unsigned int irq, irq_handler_t handler, unsigned long flags,
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const char *name, void *arg)
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{
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struct resource *res;
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struct irq_ent *irqe;
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struct device *dev;
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int error;
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int rid;
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dev = _pci_find_irq_dev(irq);
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if (dev == NULL)
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return -ENXIO;
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rid = _irq_rid(dev, irq);
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res = bus_alloc_resource_any(dev->bsddev, SYS_RES_IRQ, &rid,
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flags | RF_ACTIVE);
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if (res == NULL)
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return (-ENXIO);
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irqe = kmalloc(sizeof(*irqe), GFP_KERNEL);
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irqe->dev = dev;
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irqe->res = res;
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irqe->arg = arg;
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irqe->handler = handler;
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irqe->irq = irq;
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error = bus_setup_intr(dev->bsddev, res, INTR_TYPE_NET | INTR_MPSAFE,
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NULL, _irq_handler, irqe, &irqe->tag);
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if (error) {
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bus_release_resource(dev->bsddev, SYS_RES_IRQ, rid, irqe->res);
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kfree(irqe);
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return (-error);
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}
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list_add(&irqe->links, &dev->irqents);
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return 0;
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}
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static inline void
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free_irq(unsigned int irq, void *device)
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{
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struct irq_ent *irqe;
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struct device *dev;
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int rid;
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dev = _pci_find_irq_dev(irq);
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if (dev == NULL)
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return;
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rid = _irq_rid(dev, irq);
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irqe = _irq_ent(dev, irq);
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if (irqe == NULL)
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return;
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bus_teardown_intr(dev->bsddev, irqe->res, irqe->tag);
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bus_release_resource(dev->bsddev, SYS_RES_IRQ, rid, irqe->res);
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list_del(&irqe->links);
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kfree(irqe);
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}
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#endif /* _LINUX_INTERRUPT_H_ */
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