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authorFrederic Weisbecker <fweisbec@gmail.com>2009-12-16 19:33:54 -0500
committerIngo Molnar <mingo@elte.hu>2009-12-18 07:11:51 -0500
commit99e8c5a3b875a34d894a711c9a3669858d6adf45 (patch)
treecb0feb7052857b9f32b476f9b4d793b8ff628974 /net/lapb
parent5d27c23df09b702868d9a3bff86ec6abd22963ac (diff)
hw-breakpoints: Fix hardware breakpoints -> perf events dependency
The kbuild's select command doesn't propagate through the config dependencies. Hence the current rules of hardware breakpoint's config can't ensure perf can never be disabled under us. We have: config X86 selects HAVE_HW_BREAKPOINTS config HAVE_HW_BREAKPOINTS select PERF_EVENTS config PERF_EVENTS [...] x86 will select the breakpoints but that won't propagate to perf events. The user can still disable the latter, but it is necessary for the breakpoints. What we need is: - x86 selects HAVE_HW_BREAKPOINTS and PERF_EVENTS - HAVE_HW_BREAKPOINTS depends on PERF_EVENTS so that we ensure PERF_EVENTS is enabled and frozen for x86. This fixes the following kind of build errors: In file included from arch/x86/kernel/hw_breakpoint.c:31: include/linux/hw_breakpoint.h: In function 'hw_breakpoint_addr': include/linux/hw_breakpoint.h:39: error: 'struct perf_event' has no member named 'attr' v2: Select also ANON_INODES from x86, required for perf Reported-by: Cyrill Gorcunov <gorcunov@gmail.com> Reported-by: Michal Marek <mmarek@suse.cz> Reported-by: Andrew Randrianasulu <randrik_a@yahoo.com> Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Paul Mackerras <paulus@samba.org> Cc: Randy Dunlap <randy.dunlap@oracle.com> Cc: K.Prasad <prasad@linux.vnet.ibm.com> LKML-Reference: <1261010034-7786-1-git-send-regression-fweisbec@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'net/lapb')
0 files changed, 0 insertions, 0 deletions
generated by cgit v1.2.2 (git 2.25.0) at 2025-08-19 22:22:01 -0400
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/*  linux/include/linux/clockchips.h
 *
 *  This file contains the structure definitions for clockchips.
 *
 *  If you are not a clockchip, or the time of day code, you should
 *  not be including this file!
 */
#ifndef _LINUX_CLOCKCHIPS_H
#define _LINUX_CLOCKCHIPS_H

/* Clock event notification values */
enum clock_event_nofitiers {
	CLOCK_EVT_NOTIFY_ADD,
	CLOCK_EVT_NOTIFY_BROADCAST_ON,
	CLOCK_EVT_NOTIFY_BROADCAST_OFF,
	CLOCK_EVT_NOTIFY_BROADCAST_FORCE,
	CLOCK_EVT_NOTIFY_BROADCAST_ENTER,
	CLOCK_EVT_NOTIFY_BROADCAST_EXIT,
	CLOCK_EVT_NOTIFY_SUSPEND,
	CLOCK_EVT_NOTIFY_RESUME,
	CLOCK_EVT_NOTIFY_CPU_DYING,
	CLOCK_EVT_NOTIFY_CPU_DEAD,
};

#ifdef CONFIG_GENERIC_CLOCKEVENTS_BUILD

#include <linux/clocksource.h>
#include <linux/cpumask.h>
#include <linux/ktime.h>
#include <linux/notifier.h>

struct clock_event_device;

/* Clock event mode commands */
enum clock_event_mode {
	CLOCK_EVT_MODE_UNUSED = 0,
	CLOCK_EVT_MODE_SHUTDOWN,
	CLOCK_EVT_MODE_PERIODIC,
	CLOCK_EVT_MODE_ONESHOT,
	CLOCK_EVT_MODE_RESUME,
};

/*
 * Clock event features
 */
#define CLOCK_EVT_FEAT_PERIODIC		0x000001
#define CLOCK_EVT_FEAT_ONESHOT		0x000002
#define CLOCK_EVT_FEAT_KTIME		0x000004
/*
 * x86(64) specific misfeatures:
 *
 * - Clockevent source stops in C3 State and needs broadcast support.
 * - Local APIC timer is used as a dummy device.
 */
#define CLOCK_EVT_FEAT_C3STOP		0x000008
#define CLOCK_EVT_FEAT_DUMMY		0x000010

/*
 * Core shall set the interrupt affinity dynamically in broadcast mode
 */
#define CLOCK_EVT_FEAT_DYNIRQ		0x000020

/**
 * struct clock_event_device - clock event device descriptor
 * @event_handler:	Assigned by the framework to be called by the low
 *			level handler of the event source
 * @set_next_event:	set next event function using a clocksource delta
 * @set_next_ktime:	set next event function using a direct ktime value
 * @next_event:		local storage for the next event in oneshot mode
 * @max_delta_ns:	maximum delta value in ns
 * @min_delta_ns:	minimum delta value in ns
 * @mult:		nanosecond to cycles multiplier
 * @shift:		nanoseconds to cycles divisor (power of two)
 * @mode:		operating mode assigned by the management code
 * @features:		features
 * @retries:		number of forced programming retries
 * @set_mode:		set mode function
 * @broadcast:		function to broadcast events
 * @min_delta_ticks:	minimum delta value in ticks stored for reconfiguration
 * @max_delta_ticks:	maximum delta value in ticks stored for reconfiguration
 * @name:		ptr to clock event name
 * @rating:		variable to rate clock event devices
 * @irq:		IRQ number (only for non CPU local devices)
 * @cpumask:		cpumask to indicate for which CPUs this device works
 * @list:		list head for the management code
 */
struct clock_event_device {
	void			(*event_handler)(struct clock_event_device *);
	int			(*set_next_event)(unsigned long evt,
						  struct clock_event_device *);
	int			(*set_next_ktime)(ktime_t expires,
						  struct clock_event_device *);
	ktime_t			next_event;
	u64			max_delta_ns;
	u64			min_delta_ns;
	u32			mult;
	u32			shift;
	enum clock_event_mode	mode;
	unsigned int		features;
	unsigned long		retries;

	void			(*broadcast)(const struct cpumask *mask);
	void			(*set_mode)(enum clock_event_mode mode,
					    struct clock_event_device *);
	void			(*suspend)(struct clock_event_device *);
	void			(*resume)(struct clock_event_device *);
	unsigned long		min_delta_ticks;
	unsigned long		max_delta_ticks;

	const char		*name;
	int			rating;
	int			irq;
	const struct cpumask	*cpumask;
	struct list_head	list;
} ____cacheline_aligned;

/*
 * Calculate a multiplication factor for scaled math, which is used to convert
 * nanoseconds based values to clock ticks:
 *
 * clock_ticks = (nanoseconds * factor) >> shift.
 *
 * div_sc is the rearranged equation to calculate a factor from a given clock
 * ticks / nanoseconds ratio:
 *
 * factor = (clock_ticks << shift) / nanoseconds
 */
static inline unsigned long div_sc(unsigned long ticks, unsigned long nsec,
				   int shift)
{
	uint64_t tmp = ((uint64_t)ticks) << shift;

	do_div(tmp, nsec);
	return (unsigned long) tmp;
}

/* Clock event layer functions */
extern u64 clockevent_delta2ns(unsigned long latch,
			       struct clock_event_device *evt);
extern void clockevents_register_device(struct clock_event_device *dev);

extern void clockevents_config(struct clock_event_device *dev, u32 freq);
extern void clockevents_config_and_register(struct clock_event_device *dev,
					    u32 freq, unsigned long min_delta,
					    unsigned long max_delta);

extern int clockevents_update_freq(struct clock_event_device *ce, u32 freq);

extern void clockevents_exchange_device(struct clock_event_device *old,
					struct clock_event_device *new);
extern void clockevents_set_mode(struct clock_event_device *dev,
				 enum clock_event_mode mode);
extern int clockevents_register_notifier(struct notifier_block *nb);
extern int clockevents_program_event(struct clock_event_device *dev,
				     ktime_t expires, bool force);

extern void clockevents_handle_noop(struct clock_event_device *dev);

static inline void
clockevents_calc_mult_shift(struct clock_event_device *ce, u32 freq, u32 minsec)
{
	return clocks_calc_mult_shift(&ce->mult, &ce->shift, NSEC_PER_SEC,
				      freq, minsec);
}

extern void clockevents_suspend(void);
extern void clockevents_resume(void);

#ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
#ifdef CONFIG_ARCH_HAS_TICK_BROADCAST
extern void tick_broadcast(const struct cpumask *mask);
#else
#define tick_broadcast	NULL
#endif
extern int tick_receive_broadcast(void);
#endif

#if defined(CONFIG_GENERIC_CLOCKEVENTS_BROADCAST) && defined(CONFIG_TICK_ONESHOT)
extern int tick_check_broadcast_expired(void);
#else
static inline int tick_check_broadcast_expired(void) { return 0; }
#endif

#ifdef CONFIG_GENERIC_CLOCKEVENTS
extern void clockevents_notify(unsigned long reason, void *arg);
#else
static inline void clockevents_notify(unsigned long reason, void *arg) {}
#endif

#else /* CONFIG_GENERIC_CLOCKEVENTS_BUILD */

static inline void clockevents_suspend(void) {}
static inline void clockevents_resume(void) {}

static inline void clockevents_notify(unsigned long reason, void *arg) {}
static inline int tick_check_broadcast_expired(void) { return 0; }

#endif

#endif
generated by cgit v1.2.2 (git 2.25.0) at 2025-08-19 22:22:00 -0400