46d396bde9
The PMU is already counting cycles by calculating time elapsed in nanoseconds. Counting instructions is a different matter and requires another approach. This patch adds the capability of counting completed instructions (Perf event PM_INST_CMPL) by counting the amount of instructions translated in each translation block right before exiting it. A new pmu_count_insns() helper in translation.c was added to do that. After verifying that the PMU is counting instructions, call helper_insns_inc(). This new helper from power8-pmu.c will add the instructions to the relevant counters. It'll also be responsible for triggering counter negative overflows as it is already being done with cycles. To verify whether the PMU is counting instructions or now, a new hflags named 'HFLAGS_INSN_CNT' is introduced. This flag will match the internal state of the PMU. We're be using this flag to avoid calling helper_insn_inc() when we do not have a valid instruction event being sampled. Reviewed-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com> Message-Id: <20211201151734.654994-7-danielhb413@gmail.com> Signed-off-by: Cédric Le Goater <clg@kaod.org>
27 lines
585 B
C
27 lines
585 B
C
/*
|
|
* PMU emulation helpers for TCG IBM POWER chips
|
|
*
|
|
* Copyright IBM Corp. 2021
|
|
*
|
|
* Authors:
|
|
* Daniel Henrique Barboza <danielhb413@gmail.com>
|
|
*
|
|
* This work is licensed under the terms of the GNU GPL, version 2 or later.
|
|
* See the COPYING file in the top-level directory.
|
|
*/
|
|
|
|
#ifndef POWER8_PMU
|
|
#define POWER8_PMU
|
|
|
|
#include "qemu/osdep.h"
|
|
#include "cpu.h"
|
|
#include "exec/exec-all.h"
|
|
#include "exec/helper-proto.h"
|
|
#include "qemu/error-report.h"
|
|
#include "qemu/main-loop.h"
|
|
|
|
void cpu_ppc_pmu_init(CPUPPCState *env);
|
|
bool pmu_insn_cnt_enabled(CPUPPCState *env);
|
|
|
|
#endif
|