feef47d0cb
The breakpoint generic layer assumes that archs always know in advance the static number of address registers available to host breakpoints through the HBP_NUM macro. However this is not true for every archs. For example Arm needs to get this information dynamically to handle the compatiblity between different versions. To solve this, this patch proposes to drop the static HBP_NUM macro and let the arch provide the number of available slots through a new hw_breakpoint_slots() function. For archs that have CONFIG_HAVE_MIXED_BREAKPOINTS_REGS selected, it will be called once as the number of registers fits for instruction and data breakpoints together. For the others it will be called first to get the number of instruction breakpoint registers and another time to get the data breakpoint registers, the targeted type is given as a parameter of hw_breakpoint_slots(). Reported-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Acked-by: Paul Mundt <lethal@linux-sh.org> Cc: Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com> Cc: K. Prasad <prasad@linux.vnet.ibm.com> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Jason Wessel <jason.wessel@windriver.com> Cc: Ingo Molnar <mingo@elte.hu>
72 lines
1.9 KiB
C
72 lines
1.9 KiB
C
#ifndef __ASM_SH_HW_BREAKPOINT_H
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#define __ASM_SH_HW_BREAKPOINT_H
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#ifdef __KERNEL__
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#define __ARCH_HW_BREAKPOINT_H
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#include <linux/kdebug.h>
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#include <linux/types.h>
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struct arch_hw_breakpoint {
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char *name; /* Contains name of the symbol to set bkpt */
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unsigned long address;
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u16 len;
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u16 type;
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};
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enum {
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SH_BREAKPOINT_READ = (1 << 1),
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SH_BREAKPOINT_WRITE = (1 << 2),
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SH_BREAKPOINT_RW = SH_BREAKPOINT_READ | SH_BREAKPOINT_WRITE,
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SH_BREAKPOINT_LEN_1 = (1 << 12),
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SH_BREAKPOINT_LEN_2 = (1 << 13),
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SH_BREAKPOINT_LEN_4 = SH_BREAKPOINT_LEN_1 | SH_BREAKPOINT_LEN_2,
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SH_BREAKPOINT_LEN_8 = (1 << 14),
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};
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struct sh_ubc {
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const char *name;
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unsigned int num_events;
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unsigned int trap_nr;
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void (*enable)(struct arch_hw_breakpoint *, int);
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void (*disable)(struct arch_hw_breakpoint *, int);
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void (*enable_all)(unsigned long);
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void (*disable_all)(void);
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unsigned long (*active_mask)(void);
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unsigned long (*triggered_mask)(void);
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void (*clear_triggered_mask)(unsigned long);
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struct clk *clk; /* optional interface clock / MSTP bit */
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};
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struct perf_event;
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struct task_struct;
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struct pmu;
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/* Maximum number of UBC channels */
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#define HBP_NUM 2
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static inline int hw_breakpoint_slots(int type)
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{
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return HBP_NUM;
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}
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/* arch/sh/kernel/hw_breakpoint.c */
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extern int arch_check_bp_in_kernelspace(struct perf_event *bp);
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extern int arch_validate_hwbkpt_settings(struct perf_event *bp);
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extern int hw_breakpoint_exceptions_notify(struct notifier_block *unused,
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unsigned long val, void *data);
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int arch_install_hw_breakpoint(struct perf_event *bp);
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void arch_uninstall_hw_breakpoint(struct perf_event *bp);
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void hw_breakpoint_pmu_read(struct perf_event *bp);
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void hw_breakpoint_pmu_unthrottle(struct perf_event *bp);
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extern void arch_fill_perf_breakpoint(struct perf_event *bp);
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extern int register_sh_ubc(struct sh_ubc *);
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extern struct pmu perf_ops_bp;
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#endif /* __KERNEL__ */
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#endif /* __ASM_SH_HW_BREAKPOINT_H */
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