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be3f152568
Optimize internal hw_breakpoint state if the architecture's number of breakpoint slots is constant. This avoids several kmalloc() calls and potentially unnecessary failures if the allocations fail, as well as subtly improves code generation and cache locality. The protocol is that if an architecture defines hw_breakpoint_slots via the preprocessor, it must be constant and the same for all types. Signed-off-by: Marco Elver <elver@google.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Acked-by: Dmitry Vyukov <dvyukov@google.com> Acked-by: Ian Rogers <irogers@google.com> Link: https://lore.kernel.org/r/20220829124719.675715-7-elver@google.com
71 lines
1.9 KiB
C
71 lines
1.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __ASM_SH_HW_BREAKPOINT_H
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#define __ASM_SH_HW_BREAKPOINT_H
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#include <uapi/asm/hw_breakpoint.h>
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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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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_attr;
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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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#define hw_breakpoint_slots(type) (HBP_NUM)
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/* arch/sh/kernel/hw_breakpoint.c */
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extern int arch_check_bp_in_kernelspace(struct arch_hw_breakpoint *hw);
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extern int hw_breakpoint_arch_parse(struct perf_event *bp,
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const struct perf_event_attr *attr,
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struct arch_hw_breakpoint *hw);
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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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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 /* __ASM_SH_HW_BREAKPOINT_H */
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