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riscv: perf: add guest vs host distinction

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Introduce basic guest support in perf, enabling it to distinguish
between PMU interrupts in the host or guest, and collect
fundamental information.

Signed-off-by: Quan Zhou <zhouquan@iscas.ac.cn>
Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
Link: https://lore.kernel.org/r/a67d527dc1b11493fe11f7f53584772fdd983744.1728957131.git.zhouquan@iscas.ac.cn
Signed-off-by: Anup Patel <anup@brainfault.org>
This commit is contained in:
Quan Zhou
2024-10-15 10:58:24 +08:00
committed by Anup Patel
parent 8198375843
commit 5bb5ccb3e8
2 changed files with 44 additions and 0 deletions
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6
arch/riscv/include/asm/perf_event.h
View File

@@ -8,7 +8,11 @@
#ifndef _ASM_RISCV_PERF_EVENT_H
#define _ASM_RISCV_PERF_EVENT_H
#ifdef CONFIG_PERF_EVENTS
#include <linux/perf_event.h>
extern unsigned long perf_instruction_pointer(struct pt_regs *regs);
extern unsigned long perf_misc_flags(struct pt_regs *regs);
#define perf_misc_flags(regs) perf_misc_flags(regs)
#define perf_arch_bpf_user_pt_regs(regs) (struct user_regs_struct *)regs
#define perf_arch_fetch_caller_regs(regs, __ip) { \
@@ -17,4 +21,6 @@
(regs)->sp = current_stack_pointer; \
(regs)->status = SR_PP; \
}
#endif
#endif /* _ASM_RISCV_PERF_EVENT_H */

38
arch/riscv/kernel/perf_callchain.c
View File

@@ -28,11 +28,49 @@ static bool fill_callchain(void *entry, unsigned long pc)
void perf_callchain_user(struct perf_callchain_entry_ctx *entry,
struct pt_regs *regs)
{
if (perf_guest_state()) {
/* TODO: We don't support guest os callchain now */
return;
}
arch_stack_walk_user(fill_callchain, entry, regs);
}
void perf_callchain_kernel(struct perf_callchain_entry_ctx *entry,
struct pt_regs *regs)
{
if (perf_guest_state()) {
/* TODO: We don't support guest os callchain now */
return;
}
walk_stackframe(NULL, regs, fill_callchain, entry);
}
unsigned long perf_instruction_pointer(struct pt_regs *regs)
{
if (perf_guest_state())
return perf_guest_get_ip();
return instruction_pointer(regs);
}
unsigned long perf_misc_flags(struct pt_regs *regs)
{
unsigned int guest_state = perf_guest_state();
unsigned long misc = 0;
if (guest_state) {
if (guest_state & PERF_GUEST_USER)
misc |= PERF_RECORD_MISC_GUEST_USER;
else
misc |= PERF_RECORD_MISC_GUEST_KERNEL;
} else {
if (user_mode(regs))
misc |= PERF_RECORD_MISC_USER;
else
misc |= PERF_RECORD_MISC_KERNEL;
}
return misc;
}