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/*-
* Copyright (c) 2010 Isilon Systems, Inc.
* Copyright (c) 2010 iX Systems, Inc.
* Copyright (c) 2010 Panasas, Inc.
* Copyright (c) 2013-2015 Mellanox Technologies, Ltd.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice unmodified, this list of conditions, and the following
* disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <linux/device.h>
#include <linux/interrupt.h>
#include <linux/pci.h>
#include <sys/param.h>
#include <sys/bus.h>
#include <sys/rman.h>
#include <sys/interrupt.h>
struct irq_ent {
struct list_head links;
struct device *dev;
struct resource *res;
void *arg;
irqreturn_t (*handler)(int, void *);
irqreturn_t (*thread_handler)(int, void *);
void *tag;
unsigned int irq;
};
static inline int
lkpi_irq_rid(struct device *dev, unsigned int irq)
{
/* check for MSI- or MSIX- interrupt */
if (irq >= dev->irq_start && irq < dev->irq_end)
return (irq - dev->irq_start + 1);
else
return (0);
}
static inline struct irq_ent *
lkpi_irq_ent(struct device *dev, unsigned int irq)
{
struct irq_ent *irqe;
list_for_each_entry(irqe, &dev->irqents, links)
if (irqe->irq == irq)
return (irqe);
return (NULL);
}
static void
lkpi_irq_handler(void *ent)
{
struct irq_ent *irqe;
if (linux_set_current_flags(curthread, M_NOWAIT))
return;
irqe = ent;
if (irqe->handler(irqe->irq, irqe->arg) == IRQ_WAKE_THREAD &&
irqe->thread_handler != NULL) {
THREAD_SLEEPING_OK();
irqe->thread_handler(irqe->irq, irqe->arg);
THREAD_NO_SLEEPING();
}
}
static inline void
lkpi_irq_release(struct device *dev, struct irq_ent *irqe)
{
if (irqe->tag != NULL)
bus_teardown_intr(dev->bsddev, irqe->res, irqe->tag);
if (irqe->res != NULL)
bus_release_resource(dev->bsddev, SYS_RES_IRQ,
rman_get_rid(irqe->res), irqe->res);
list_del(&irqe->links);
}
static void
lkpi_devm_irq_release(struct device *dev, void *p)
{
struct irq_ent *irqe;
if (dev == NULL || p == NULL)
return;
irqe = p;
lkpi_irq_release(dev, irqe);
}
int
lkpi_request_irq(struct device *xdev, unsigned int irq,
irq_handler_t handler, irq_handler_t thread_handler,
unsigned long flags, const char *name, void *arg)
{
struct resource *res;
struct irq_ent *irqe;
struct device *dev;
unsigned resflags;
int error;
int rid;
dev = lkpi_pci_find_irq_dev(irq);
if (dev == NULL)
return -ENXIO;
if (xdev != NULL && xdev != dev)
return -ENXIO;
rid = lkpi_irq_rid(dev, irq);
resflags = RF_ACTIVE;
if ((flags & IRQF_SHARED) != 0)
resflags |= RF_SHAREABLE;
res = bus_alloc_resource_any(dev->bsddev, SYS_RES_IRQ, &rid, resflags);
if (res == NULL)
return (-ENXIO);
if (xdev != NULL)
irqe = lkpi_devres_alloc(lkpi_devm_irq_release, sizeof(*irqe),
GFP_KERNEL | __GFP_ZERO);
else
irqe = kzalloc(sizeof(*irqe), GFP_KERNEL);
irqe->dev = dev;
irqe->res = res;
irqe->arg = arg;
irqe->handler = handler;
irqe->thread_handler = thread_handler;
irqe->irq = irq;
error = bus_setup_intr(dev->bsddev, res, INTR_TYPE_NET | INTR_MPSAFE,
NULL, lkpi_irq_handler, irqe, &irqe->tag);
if (error)
goto errout;
list_add(&irqe->links, &dev->irqents);
if (xdev != NULL)
devres_add(xdev, irqe);
return 0;
errout:
bus_release_resource(dev->bsddev, SYS_RES_IRQ, rid, irqe->res);
if (xdev != NULL)
devres_free(irqe);
else
kfree(irqe);
return (-error);
}
int
lkpi_enable_irq(unsigned int irq)
{
struct irq_ent *irqe;
struct device *dev;
dev = lkpi_pci_find_irq_dev(irq);
if (dev == NULL)
return -EINVAL;
irqe = lkpi_irq_ent(dev, irq);
if (irqe == NULL || irqe->tag != NULL)
return -EINVAL;
return -bus_setup_intr(dev->bsddev, irqe->res, INTR_TYPE_NET | INTR_MPSAFE,
NULL, lkpi_irq_handler, irqe, &irqe->tag);
}
void
lkpi_disable_irq(unsigned int irq)
{
struct irq_ent *irqe;
struct device *dev;
dev = lkpi_pci_find_irq_dev(irq);
if (dev == NULL)
return;
irqe = lkpi_irq_ent(dev, irq);
if (irqe == NULL)
return;
if (irqe->tag != NULL)
bus_teardown_intr(dev->bsddev, irqe->res, irqe->tag);
irqe->tag = NULL;
}
int
lkpi_bind_irq_to_cpu(unsigned int irq, int cpu_id)
{
struct irq_ent *irqe;
struct device *dev;
dev = lkpi_pci_find_irq_dev(irq);
if (dev == NULL)
return (-ENOENT);
irqe = lkpi_irq_ent(dev, irq);
if (irqe == NULL)
return (-ENOENT);
return (-bus_bind_intr(dev->bsddev, irqe->res, cpu_id));
}
void
lkpi_free_irq(unsigned int irq, void *device __unused)
{
struct irq_ent *irqe;
struct device *dev;
dev = lkpi_pci_find_irq_dev(irq);
if (dev == NULL)
return;
irqe = lkpi_irq_ent(dev, irq);
if (irqe == NULL)
return;
lkpi_irq_release(dev, irqe);
kfree(irqe);
}
void
lkpi_devm_free_irq(struct device *xdev, unsigned int irq, void *p __unused)
{
struct device *dev;
struct irq_ent *irqe;
dev = lkpi_pci_find_irq_dev(irq);
if (dev == NULL)
return;
if (xdev != dev)
return;
irqe = lkpi_irq_ent(dev, irq);
if (irqe == NULL)
return;
lkpi_irq_release(dev, irqe);
lkpi_devres_unlink(dev, irqe);
lkpi_devres_free(irqe);
return;
}
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