bpf: Prevent memory disambiguation attack

[mirror_ubuntu-artful-kernel.git] / include / linux / smp.h

#ifndef __LINUX_SMP_H
#define __LINUX_SMP_H

/*
 *	Generic SMP support
 *		Alan Cox. <alan@redhat.com>
 */

#include <linux/errno.h>
#include <linux/types.h>
#include <linux/list.h>
#include <linux/cpumask.h>
#include <linux/init.h>
#include <linux/llist.h>

typedef void (*smp_call_func_t)(void *info);
struct call_single_data {
	struct llist_node llist;
	smp_call_func_t func;
	void *info;
	unsigned int flags;
};

/* total number of cpus in this system (may exceed NR_CPUS) */
extern unsigned int total_cpus;

int smp_call_function_single(int cpuid, smp_call_func_t func, void *info,
			     int wait);

/*
 * Call a function on all processors
 */
int on_each_cpu(smp_call_func_t func, void *info, int wait);

/*
 * Call a function on processors specified by mask, which might include
 * the local one.
 */
void on_each_cpu_mask(const struct cpumask *mask, smp_call_func_t func,
		void *info, bool wait);

/*
 * Call a function on each processor for which the supplied function
 * cond_func returns a positive value. This may include the local
 * processor.
 */
void on_each_cpu_cond(bool (*cond_func)(int cpu, void *info),
		smp_call_func_t func, void *info, bool wait,
		gfp_t gfp_flags);

int smp_call_function_single_async(int cpu, struct call_single_data *csd);

#ifdef CONFIG_X86
/* indicate usage of IBRS to control execution speculation */
extern int use_ibrs;
extern u32 sysctl_ibrs_enabled;
extern struct mutex spec_ctrl_mutex;
#define ibrs_supported		(use_ibrs & 0x2)
#define ibrs_disabled		(use_ibrs & 0x4)
static inline void set_ibrs_inuse(void)
{
	if (ibrs_supported)
		use_ibrs |= 0x1;
}
static inline void clear_ibrs_inuse(void)
{
	use_ibrs &= ~0x1;
}
static inline int check_ibrs_inuse(void)
{
	if (use_ibrs & 0x1)
		return 1;
	else
		/* rmb to prevent wrong speculation for security */
		rmb();
	return 0;
}
static inline void set_ibrs_supported(void)
{
	use_ibrs |= 0x2;
	if (!ibrs_disabled)
		set_ibrs_inuse();
}
static inline void set_ibrs_disabled(void)
{
	use_ibrs |= 0x4;
	if (check_ibrs_inuse())
		clear_ibrs_inuse();
}
static inline void clear_ibrs_disabled(void)
{
	use_ibrs &= ~0x4;
	set_ibrs_inuse();
}
#define ibrs_inuse 		(check_ibrs_inuse())

/* indicate usage of IBPB to control execution speculation */
extern int use_ibpb;
extern u32 sysctl_ibpb_enabled;
#define ibpb_supported		(use_ibpb & 0x2)
#define ibpb_disabled		(use_ibpb & 0x4)
static inline void set_ibpb_inuse(void)
{
	if (ibpb_supported)
		use_ibpb |= 0x1;
}
static inline void clear_ibpb_inuse(void)
{
	use_ibpb &= ~0x1;
}
static inline int check_ibpb_inuse(void)
{
	if (use_ibpb & 0x1)
		return 1;
	else
		/* rmb to prevent wrong speculation for security */
		rmb();
	return 0;
}
static inline void set_ibpb_supported(void)
{
	use_ibpb |= 0x2;
	if (!ibpb_disabled)
		set_ibpb_inuse();
}
static inline void set_ibpb_disabled(void)
{
	use_ibpb |= 0x4;
	if (check_ibpb_inuse())
		clear_ibpb_inuse();
}
static inline void clear_ibpb_disabled(void)
{
	use_ibpb &= ~0x4;
	set_ibpb_inuse();
}
#define ibpb_inuse		(check_ibpb_inuse())
#endif

#ifdef CONFIG_SMP

#include <linux/preempt.h>
#include <linux/kernel.h>
#include <linux/compiler.h>
#include <linux/thread_info.h>
#include <asm/smp.h>

/*
 * main cross-CPU interfaces, handles INIT, TLB flush, STOP, etc.
 * (defined in asm header):
 */

/*
 * stops all CPUs but the current one:
 */
extern void smp_send_stop(void);

/*
 * sends a 'reschedule' event to another CPU:
 */
extern void smp_send_reschedule(int cpu);


/*
 * Prepare machine for booting other CPUs.
 */
extern void smp_prepare_cpus(unsigned int max_cpus);

/*
 * Bring a CPU up
 */
extern int __cpu_up(unsigned int cpunum, struct task_struct *tidle);

/*
 * Final polishing of CPUs
 */
extern void smp_cpus_done(unsigned int max_cpus);

/*
 * Call a function on all other processors
 */
int smp_call_function(smp_call_func_t func, void *info, int wait);
void smp_call_function_many(const struct cpumask *mask,
			    smp_call_func_t func, void *info, bool wait);

int smp_call_function_any(const struct cpumask *mask,
			  smp_call_func_t func, void *info, int wait);

void kick_all_cpus_sync(void);
void wake_up_all_idle_cpus(void);

/*
 * Generic and arch helpers
 */
void __init call_function_init(void);
void generic_smp_call_function_single_interrupt(void);
#define generic_smp_call_function_interrupt \
	generic_smp_call_function_single_interrupt

/*
 * Mark the boot cpu "online" so that it can call console drivers in
 * printk() and can access its per-cpu storage.
 */
void smp_prepare_boot_cpu(void);

extern unsigned int setup_max_cpus;
extern void __init setup_nr_cpu_ids(void);
extern void __init smp_init(void);

extern int __boot_cpu_id;

static inline int get_boot_cpu_id(void)
{
	return __boot_cpu_id;
}

#else /* !SMP */

static inline void smp_send_stop(void) { }

/*
 *	These macros fold the SMP functionality into a single CPU system
 */
#define raw_smp_processor_id()			0
static inline int up_smp_call_function(smp_call_func_t func, void *info)
{
	return 0;
}
#define smp_call_function(func, info, wait) \
			(up_smp_call_function(func, info))

static inline void smp_send_reschedule(int cpu) { }
#define smp_prepare_boot_cpu()			do {} while (0)
#define smp_call_function_many(mask, func, info, wait) \
			(up_smp_call_function(func, info))
static inline void call_function_init(void) { }

static inline int
smp_call_function_any(const struct cpumask *mask, smp_call_func_t func,
		      void *info, int wait)
{
	return smp_call_function_single(0, func, info, wait);
}

static inline void kick_all_cpus_sync(void) {  }
static inline void wake_up_all_idle_cpus(void) {  }

#ifdef CONFIG_UP_LATE_INIT
extern void __init up_late_init(void);
static inline void smp_init(void) { up_late_init(); }
#else
static inline void smp_init(void) { }
#endif

static inline int get_boot_cpu_id(void)
{
	return 0;
}

#endif /* !SMP */

/*
 * smp_processor_id(): get the current CPU ID.
 *
 * if DEBUG_PREEMPT is enabled then we check whether it is
 * used in a preemption-safe way. (smp_processor_id() is safe
 * if it's used in a preemption-off critical section, or in
 * a thread that is bound to the current CPU.)
 *
 * NOTE: raw_smp_processor_id() is for internal use only
 * (smp_processor_id() is the preferred variant), but in rare
 * instances it might also be used to turn off false positives
 * (i.e. smp_processor_id() use that the debugging code reports but
 * which use for some reason is legal). Don't use this to hack around
 * the warning message, as your code might not work under PREEMPT.
 */
#ifdef CONFIG_DEBUG_PREEMPT
  extern unsigned int debug_smp_processor_id(void);
# define smp_processor_id() debug_smp_processor_id()
#else
# define smp_processor_id() raw_smp_processor_id()
#endif

#define get_cpu()		({ preempt_disable(); smp_processor_id(); })
#define put_cpu()		preempt_enable()

/*
 * Callback to arch code if there's nosmp or maxcpus=0 on the
 * boot command line:
 */
extern void arch_disable_smp_support(void);

extern void arch_enable_nonboot_cpus_begin(void);
extern void arch_enable_nonboot_cpus_end(void);

void smp_setup_processor_id(void);

int smp_call_on_cpu(unsigned int cpu, int (*func)(void *), void *par,
		    bool phys);

/* SMP core functions */
int smpcfd_prepare_cpu(unsigned int cpu);
int smpcfd_dead_cpu(unsigned int cpu);
int smpcfd_dying_cpu(unsigned int cpu);

#endif /* __LINUX_SMP_H */