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LinuxKPI: enhance the irq KPI for managed and threaded operations.

Browse source 
Move request_irq() to an internal function which serves request_irq()
and the newly added request_threaded_irq() and devm_request_threaded_irq().
Likewise factor out parts of free_irq() to also be used with
devm_free_irq().  Add the storage and call to a thread_handler in case
of IRQ_WAKE_THREAD.
This is needed for the iwlwifi driver.

Sponsored by:	The FreeBSD Foundation
Reviewed by:	hselasky
Differential Revision: https://reviews.freebsd.org/D30549

(cherry picked from commit d16b6cb178)
This commit is contained in:
Bjoern A. Zeeb 2021-05-30 13:54:13 +00:00
parent 40a215e38a
commit 1eaaada457
2 changed files with 110 additions and 18 deletions
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97
sys/compat/linuxkpi/common/include/linux/interrupt.h
View file

@ -37,6 +37,7 @@
#include <linux/irqreturn.h>
#include <linux/hardirq.h>
#include <sys/param.h>
#include <sys/bus.h>
#include <sys/rman.h>
#include <sys/interrupt.h>
@ -51,10 +52,15 @@ struct irq_ent {
struct resource *res;
void *arg;
irqreturn_t (*handler)(int, void *);
irqreturn_t (*thread_handler)(int, void *);
void *tag;
unsigned int irq;
};
void linux_irq_handler(void *);
void lkpi_devm_irq_release(struct device *, void *);
void lkpi_irq_release(struct device *, struct irq_ent *);
static inline int
linux_irq_rid(struct device *dev, unsigned int irq)
{
@ -65,8 +71,6 @@ linux_irq_rid(struct device *dev, unsigned int irq)
return (0);
}
extern void linux_irq_handler(void *);
static inline struct irq_ent *
linux_irq_ent(struct device *dev, unsigned int irq)
{
@ -80,8 +84,9 @@ linux_irq_ent(struct device *dev, unsigned int irq)
}
static inline int
request_irq(unsigned int irq, irq_handler_t handler, unsigned long flags,
const char *name, void *arg)
_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;
@ -92,27 +97,70 @@ request_irq(unsigned int irq, irq_handler_t handler, unsigned long flags,
dev = linux_pci_find_irq_dev(irq);
if (dev == NULL)
return -ENXIO;
if (xdev != NULL && xdev != dev)
return -ENXIO;
rid = linux_irq_rid(dev, irq);
res = bus_alloc_resource_any(dev->bsddev, SYS_RES_IRQ, &rid,
flags | RF_ACTIVE);
if (res == NULL)
return (-ENXIO);
irqe = kmalloc(sizeof(*irqe), GFP_KERNEL);
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, linux_irq_handler, irqe, &irqe->tag);
if (error) {
bus_release_resource(dev->bsddev, SYS_RES_IRQ, rid, irqe->res);
kfree(irqe);
return (-error);
}
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);
}
static inline int
request_irq(unsigned int irq, irq_handler_t handler, unsigned long flags,
const char *name, void *arg)
{
return (_request_irq(NULL, irq, handler, NULL, flags, name, arg));
}
static inline int
request_threaded_irq(int irq, irq_handler_t handler,
irq_handler_t thread_handler, unsigned long flags,
const char *name, void *arg)
{
return (_request_irq(NULL, irq, handler, thread_handler,
flags, name, arg));
}
static inline int
devm_request_threaded_irq(struct device *dev, int irq,
irq_handler_t handler, irq_handler_t thread_handler,
unsigned long flags, const char *name, void *arg)
{
return (_request_irq(dev, irq, handler, thread_handler,
flags, name, arg));
}
static inline int
@ -166,26 +214,41 @@ bind_irq_to_cpu(unsigned int irq, int cpu_id)
}
static inline void
free_irq(unsigned int irq, void *device)
free_irq(unsigned int irq, void *device __unused)
{
struct irq_ent *irqe;
struct device *dev;
int rid;
dev = linux_pci_find_irq_dev(irq);
if (dev == NULL)
return;
rid = linux_irq_rid(dev, irq);
irqe = linux_irq_ent(dev, irq);
if (irqe == NULL)
return;
if (irqe->tag != NULL)
bus_teardown_intr(dev->bsddev, irqe->res, irqe->tag);
bus_release_resource(dev->bsddev, SYS_RES_IRQ, rid, irqe->res);
list_del(&irqe->links);
lkpi_irq_release(dev, irqe);
kfree(irqe);
}
static inline void
devm_free_irq(struct device *xdev, unsigned int irq, void *p)
{
struct device *dev;
struct irq_ent *irqe;
dev = linux_pci_find_irq_dev(irq);
if (dev == NULL)
return;
if (xdev != dev)
return;
irqe = linux_irq_ent(dev, irq);
if (irqe == NULL)
return;
lkpi_irq_release(dev, irqe);
lkpi_devres_unlink(dev, irqe);
lkpi_devres_free(irqe);
return;
}
static inline int
irq_set_affinity_hint(int vector, cpumask_t *mask)
{

31
sys/compat/linuxkpi/common/src/linux_compat.c
View file

@ -2463,6 +2463,30 @@ list_sort(void *priv, struct list_head *head, int (*cmp)(void *priv,
free(ar, M_KMALLOC);
}
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);
}
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);
}
void
linux_irq_handler(void *ent)
{
@ -2472,7 +2496,12 @@ linux_irq_handler(void *ent)
return;
irqe = ent;
irqe->handler(irqe->irq, irqe->arg);
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();
}
}
#if defined(__i386__) || defined(__amd64__)