ef23481a79
Tasklets are implemented using a taskqueue and a small statemachine on top. The additional statemachine is required to ensure all LinuxKPI tasklets get serialized. FreeBSD taskqueues do not guarantee serialisation of its tasks, except when there is only one worker thread configured. MFC after: 1 week Sponsored by: Mellanox Technologies
173 lines
4.4 KiB
C
173 lines
4.4 KiB
C
/*-
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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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* Copyright (c) 2013-2015 Mellanox Technologies, Ltd.
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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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* $FreeBSD$
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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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unsigned int irq;
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};
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static inline int
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linux_irq_rid(struct device *dev, unsigned 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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extern void linux_irq_handler(void *);
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static inline struct irq_ent *
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linux_irq_ent(struct device *dev, unsigned 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 = linux_pci_find_irq_dev(irq);
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if (dev == NULL)
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return -ENXIO;
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rid = linux_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, linux_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 int
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bind_irq_to_cpu(unsigned int irq, int cpu_id)
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{
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struct irq_ent *irqe;
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struct device *dev;
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dev = linux_pci_find_irq_dev(irq);
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if (dev == NULL)
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return (-ENOENT);
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irqe = linux_irq_ent(dev, irq);
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if (irqe == NULL)
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return (-ENOENT);
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return (-bus_bind_intr(dev->bsddev, irqe->res, cpu_id));
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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 = linux_pci_find_irq_dev(irq);
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if (dev == NULL)
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return;
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rid = linux_irq_rid(dev, irq);
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irqe = linux_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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/*
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* LinuxKPI tasklet support
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*/
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typedef void tasklet_func_t(unsigned long);
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struct tasklet_struct {
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TAILQ_ENTRY(tasklet_struct) entry;
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tasklet_func_t *func;
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unsigned long data;
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};
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#define DECLARE_TASKLET(name, func, data) \
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struct tasklet_struct name = { { NULL, NULL }, func, data }
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#define tasklet_hi_schedule(t) tasklet_schedule(t)
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extern void tasklet_schedule(struct tasklet_struct *);
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extern void tasklet_kill(struct tasklet_struct *);
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extern void tasklet_init(struct tasklet_struct *, tasklet_func_t *,
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unsigned long data);
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#endif /* _LINUX_INTERRUPT_H_ */
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