Differential D11963 Diff 32012 head/sys/kern/subr_autoconf.c

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head/sys/kern/subr_autoconf.c

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__FBSDID("$FreeBSD$");		__FBSDID("$FreeBSD$");

#include "opt_ddb.h"		#include "opt_ddb.h"

#include <sys/param.h>		#include <sys/param.h>
#include <sys/kernel.h>		#include <sys/kernel.h>
#include <sys/linker.h>		#include <sys/linker.h>
#include <sys/lock.h>		#include <sys/lock.h>
		#include <sys/malloc.h>
#include <sys/mutex.h>		#include <sys/mutex.h>
#include <sys/systm.h>		#include <sys/systm.h>

/*		/*
* Autoconfiguration subroutines.		* Autoconfiguration subroutines.
*/		*/

/*		/*
* "Interrupt driven config" functions.		* "Interrupt driven config" functions.
*/		*/
static TAILQ_HEAD(, intr_config_hook) intr_config_hook_list =		static TAILQ_HEAD(, intr_config_hook) intr_config_hook_list =
TAILQ_HEAD_INITIALIZER(intr_config_hook_list);		TAILQ_HEAD_INITIALIZER(intr_config_hook_list);
static struct intr_config_hook *next_to_notify;		static struct intr_config_hook *next_to_notify;
static struct mtx intr_config_hook_lock;		static struct mtx intr_config_hook_lock;
MTX_SYSINIT(intr_config_hook, &intr_config_hook_lock, "intr config", MTX_DEF);		MTX_SYSINIT(intr_config_hook, &intr_config_hook_lock, "intr config", MTX_DEF);

/* ARGSUSED */		/* ARGSUSED */
static void run_interrupt_driven_config_hooks(void);		static void run_interrupt_driven_config_hooks(void);

/*		/*
		* Private data and a shim function for implementing config_interhook_oneshot().
		*/
		struct oneshot_config_hook {
		struct intr_config_hook
		och_hook; /* Must be first */
		ich_func_t och_func;
		void *och_arg;
		};

		static void
		config_intrhook_oneshot_func(void *arg)
		{
		struct oneshot_config_hook *ohook;

		ohook = arg;
		ohook->och_func(ohook->och_arg);
		config_intrhook_disestablish(&ohook->och_hook);
		free(ohook, M_DEVBUF);
		}

		/*
* If we wait too long for an interrupt-driven config hook to return, print		* If we wait too long for an interrupt-driven config hook to return, print
* a diagnostic.		* a diagnostic.
*/		*/
#define WARNING_INTERVAL_SECS 60		#define WARNING_INTERVAL_SECS 60
static void		static void
run_interrupt_driven_config_hooks_warning(int warned)		run_interrupt_driven_config_hooks_warning(int warned)
{		{
struct intr_config_hook *hook_entry;		struct intr_config_hook *hook_entry;
▲ Show 20 Lines • Show All 102 Lines • ▼ Show 20 Lines	config_intrhook_establish(struct intr_config_hook *hook)
if (cold == 0)		if (cold == 0)
/*		/*
* XXX Call from a task since not all drivers expect		* XXX Call from a task since not all drivers expect
* to be re-entered at the time a hook is established.		* to be re-entered at the time a hook is established.
*/		*/
/* XXX Sufficient for modules loaded after initial config??? */		/* XXX Sufficient for modules loaded after initial config??? */
run_interrupt_driven_config_hooks();		run_interrupt_driven_config_hooks();
return (0);		return (0);
		}

		/*
		* Register a hook function that is automatically unregistered after it runs.
		*/
		void
		config_intrhook_oneshot(ich_func_t func, void *arg)
		{
		struct oneshot_config_hook *ohook;

		ohook = malloc(sizeof(*ohook), M_DEVBUF, M_WAITOK);
		ohook->och_func = func;
		ohook->och_arg = arg;
		ohook->och_hook.ich_func = config_intrhook_oneshot_func;
		ohook->och_hook.ich_arg = ohook;
		config_intrhook_establish(&ohook->och_hook);
}		}

void		void
config_intrhook_disestablish(struct intr_config_hook *hook)		config_intrhook_disestablish(struct intr_config_hook *hook)
{		{
struct intr_config_hook *hook_entry;		struct intr_config_hook *hook_entry;

mtx_lock(&intr_config_hook_lock);		mtx_lock(&intr_config_hook_lock);
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