ef3534a94f
kbuild test robot reported some build warnings in the hw_breakpoint code when compiled with clang[1]. Some of them were introduced by the recent powerpc change to add arch_reserve_bp_slot() and arch_release_bp_slot(). Fix them all. kernel/events/hw_breakpoint.c:71:12: warning: no previous prototype for function 'hw_breakpoint_weight' kernel/events/hw_breakpoint.c:216:12: warning: no previous prototype for function 'arch_reserve_bp_slot' kernel/events/hw_breakpoint.c:221:13: warning: no previous prototype for function 'arch_release_bp_slot' kernel/events/hw_breakpoint.c:228:13: warning: no previous prototype for function 'arch_unregister_hw_breakpoint' [1]: https://lore.kernel.org/linuxppc-dev/202005192233.oi9CjRtA%25lkp@intel.com/ Fixes: 29da4f91c0c1 ("powerpc/watchpoint: Don't allow concurrent perf and ptrace events") Reported-by: kbuild test robot <lkp@intel.com> Signed-off-by: Ravi Bangoria <ravi.bangoria@linux.ibm.com> [mpe: Drop extern, flesh out change log, add Fixes tag] Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20200602041208.128913-1-ravi.bangoria@linux.ibm.com
115 lines
3.2 KiB
C
115 lines
3.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
|
|
/*
|
|
* PowerPC BookIII S hardware breakpoint definitions
|
|
*
|
|
* Copyright 2010, IBM Corporation.
|
|
* Author: K.Prasad <prasad@linux.vnet.ibm.com>
|
|
*/
|
|
|
|
#ifndef _PPC_BOOK3S_64_HW_BREAKPOINT_H
|
|
#define _PPC_BOOK3S_64_HW_BREAKPOINT_H
|
|
|
|
#ifdef __KERNEL__
|
|
struct arch_hw_breakpoint {
|
|
unsigned long address;
|
|
u16 type;
|
|
u16 len; /* length of the target data symbol */
|
|
u16 hw_len; /* length programmed in hw */
|
|
};
|
|
|
|
/* Note: Don't change the the first 6 bits below as they are in the same order
|
|
* as the dabr and dabrx.
|
|
*/
|
|
#define HW_BRK_TYPE_READ 0x01
|
|
#define HW_BRK_TYPE_WRITE 0x02
|
|
#define HW_BRK_TYPE_TRANSLATE 0x04
|
|
#define HW_BRK_TYPE_USER 0x08
|
|
#define HW_BRK_TYPE_KERNEL 0x10
|
|
#define HW_BRK_TYPE_HYP 0x20
|
|
#define HW_BRK_TYPE_EXTRANEOUS_IRQ 0x80
|
|
|
|
/* bits that overlap with the bottom 3 bits of the dabr */
|
|
#define HW_BRK_TYPE_RDWR (HW_BRK_TYPE_READ | HW_BRK_TYPE_WRITE)
|
|
#define HW_BRK_TYPE_DABR (HW_BRK_TYPE_RDWR | HW_BRK_TYPE_TRANSLATE)
|
|
#define HW_BRK_TYPE_PRIV_ALL (HW_BRK_TYPE_USER | HW_BRK_TYPE_KERNEL | \
|
|
HW_BRK_TYPE_HYP)
|
|
|
|
/* Minimum granularity */
|
|
#ifdef CONFIG_PPC_8xx
|
|
#define HW_BREAKPOINT_SIZE 0x4
|
|
#else
|
|
#define HW_BREAKPOINT_SIZE 0x8
|
|
#endif
|
|
|
|
#define DABR_MAX_LEN 8
|
|
#define DAWR_MAX_LEN 512
|
|
|
|
static inline int nr_wp_slots(void)
|
|
{
|
|
return HBP_NUM_MAX;
|
|
}
|
|
|
|
#ifdef CONFIG_HAVE_HW_BREAKPOINT
|
|
#include <linux/kdebug.h>
|
|
#include <asm/reg.h>
|
|
#include <asm/debug.h>
|
|
|
|
struct perf_event_attr;
|
|
struct perf_event;
|
|
struct pmu;
|
|
struct perf_sample_data;
|
|
struct task_struct;
|
|
|
|
extern int hw_breakpoint_slots(int type);
|
|
extern int arch_bp_generic_fields(int type, int *gen_bp_type);
|
|
extern int arch_check_bp_in_kernelspace(struct arch_hw_breakpoint *hw);
|
|
extern int hw_breakpoint_arch_parse(struct perf_event *bp,
|
|
const struct perf_event_attr *attr,
|
|
struct arch_hw_breakpoint *hw);
|
|
extern int hw_breakpoint_exceptions_notify(struct notifier_block *unused,
|
|
unsigned long val, void *data);
|
|
int arch_install_hw_breakpoint(struct perf_event *bp);
|
|
void arch_uninstall_hw_breakpoint(struct perf_event *bp);
|
|
void hw_breakpoint_pmu_read(struct perf_event *bp);
|
|
extern void flush_ptrace_hw_breakpoint(struct task_struct *tsk);
|
|
|
|
extern struct pmu perf_ops_bp;
|
|
extern void ptrace_triggered(struct perf_event *bp,
|
|
struct perf_sample_data *data, struct pt_regs *regs);
|
|
static inline void hw_breakpoint_disable(void)
|
|
{
|
|
int i;
|
|
struct arch_hw_breakpoint null_brk = {0};
|
|
|
|
if (!ppc_breakpoint_available())
|
|
return;
|
|
|
|
for (i = 0; i < nr_wp_slots(); i++)
|
|
__set_breakpoint(i, &null_brk);
|
|
}
|
|
extern void thread_change_pc(struct task_struct *tsk, struct pt_regs *regs);
|
|
int hw_breakpoint_handler(struct die_args *args);
|
|
|
|
#else /* CONFIG_HAVE_HW_BREAKPOINT */
|
|
static inline void hw_breakpoint_disable(void) { }
|
|
static inline void thread_change_pc(struct task_struct *tsk,
|
|
struct pt_regs *regs) { }
|
|
|
|
#endif /* CONFIG_HAVE_HW_BREAKPOINT */
|
|
|
|
|
|
#ifdef CONFIG_PPC_DAWR
|
|
extern bool dawr_force_enable;
|
|
static inline bool dawr_enabled(void)
|
|
{
|
|
return dawr_force_enable;
|
|
}
|
|
int set_dawr(int nr, struct arch_hw_breakpoint *brk);
|
|
#else
|
|
static inline bool dawr_enabled(void) { return false; }
|
|
static inline int set_dawr(int nr, struct arch_hw_breakpoint *brk) { return -1; }
|
|
#endif
|
|
|
|
#endif /* __KERNEL__ */
|
|
#endif /* _PPC_BOOK3S_64_HW_BREAKPOINT_H */
|