From: Quan Zhou <zhouquan@xxxxxxxxxxx> 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@xxxxxxxxxxx> --- arch/riscv/include/asm/perf_event.h | 7 ++++++ arch/riscv/kernel/perf_callchain.c | 38 +++++++++++++++++++++++++++++ 2 files changed, 45 insertions(+) diff --git a/arch/riscv/include/asm/perf_event.h b/arch/riscv/include/asm/perf_event.h index 665bbc9b2f84..c2b73c3aefe4 100644 --- a/arch/riscv/include/asm/perf_event.h +++ b/arch/riscv/include/asm/perf_event.h @@ -8,13 +8,20 @@ #ifndef _ASM_RISCV_PERF_EVENT_H #define _ASM_RISCV_PERF_EVENT_H +#ifdef CONFIG_PERF_EVENTS #include <linux/perf_event.h> #define perf_arch_bpf_user_pt_regs(regs) (struct user_regs_struct *)regs +extern unsigned long perf_instruction_pointer(struct pt_regs *regs); +extern unsigned short perf_misc_flags(struct pt_regs *regs); +#define perf_misc_flags(regs) perf_misc_flags(regs) + #define perf_arch_fetch_caller_regs(regs, __ip) { \ (regs)->epc = (__ip); \ (regs)->s0 = (unsigned long) __builtin_frame_address(0); \ (regs)->sp = current_stack_pointer; \ (regs)->status = SR_PP; \ } +#endif + #endif /* _ASM_RISCV_PERF_EVENT_H */ diff --git a/arch/riscv/kernel/perf_callchain.c b/arch/riscv/kernel/perf_callchain.c index 3348a61de7d9..7af90a3bb373 100644 --- a/arch/riscv/kernel/perf_callchain.c +++ b/arch/riscv/kernel/perf_callchain.c @@ -58,6 +58,11 @@ void perf_callchain_user(struct perf_callchain_entry_ctx *entry, { unsigned long fp = 0; + if (perf_guest_state()) { + /* TODO: We don't support guest os callchain now */ + return; + } + fp = regs->s0; perf_callchain_store(entry, regs->epc); @@ -74,5 +79,38 @@ static bool fill_callchain(void *entry, unsigned long pc) 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 short perf_misc_flags(struct pt_regs *regs) +{ + unsigned int guest_state = perf_guest_state(); + unsigned short 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; +} -- 2.34.1