486 lines
9.3 KiB
C
486 lines
9.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright 2014, Michael Ellerman, IBM Corp.
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*/
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#define _GNU_SOURCE /* For CPU_ZERO etc. */
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#include <sched.h>
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#include <sys/wait.h>
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#include <setjmp.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/ioctl.h>
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#include "trace.h"
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#include "ebb.h"
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void (*ebb_user_func)(void);
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void ebb_hook(void)
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{
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if (ebb_user_func)
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ebb_user_func();
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}
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struct ebb_state ebb_state;
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u64 sample_period = 0x40000000ull;
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void reset_ebb_with_clear_mask(unsigned long mmcr0_clear_mask)
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{
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u64 val;
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/* 2) clear MMCR0[PMAO] - docs say BESCR[PMEO] should do this */
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/* 3) set MMCR0[PMAE] - docs say BESCR[PME] should do this */
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val = mfspr(SPRN_MMCR0);
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mtspr(SPRN_MMCR0, (val & ~mmcr0_clear_mask) | MMCR0_PMAE);
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/* 4) clear BESCR[PMEO] */
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mtspr(SPRN_BESCRR, BESCR_PMEO);
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/* 5) set BESCR[PME] */
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mtspr(SPRN_BESCRS, BESCR_PME);
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/* 6) rfebb 1 - done in our caller */
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}
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void reset_ebb(void)
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{
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reset_ebb_with_clear_mask(MMCR0_PMAO | MMCR0_FC);
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}
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/* Called outside of the EBB handler to check MMCR0 is sane */
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int ebb_check_mmcr0(void)
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{
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u64 val;
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val = mfspr(SPRN_MMCR0);
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if ((val & (MMCR0_FC | MMCR0_PMAO)) == MMCR0_FC) {
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/* It's OK if we see FC & PMAO, but not FC by itself */
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printf("Outside of loop, only FC set 0x%llx\n", val);
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return 1;
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}
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return 0;
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}
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bool ebb_check_count(int pmc, u64 sample_period, int fudge)
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{
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u64 count, upper, lower;
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count = ebb_state.stats.pmc_count[PMC_INDEX(pmc)];
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lower = ebb_state.stats.ebb_count * (sample_period - fudge);
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if (count < lower) {
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printf("PMC%d count (0x%llx) below lower limit 0x%llx (-0x%llx)\n",
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pmc, count, lower, lower - count);
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return false;
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}
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upper = ebb_state.stats.ebb_count * (sample_period + fudge);
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if (count > upper) {
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printf("PMC%d count (0x%llx) above upper limit 0x%llx (+0x%llx)\n",
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pmc, count, upper, count - upper);
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return false;
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}
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printf("PMC%d count (0x%llx) is between 0x%llx and 0x%llx delta +0x%llx/-0x%llx\n",
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pmc, count, lower, upper, count - lower, upper - count);
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return true;
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}
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void standard_ebb_callee(void)
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{
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int found, i;
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u64 val;
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val = mfspr(SPRN_BESCR);
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if (!(val & BESCR_PMEO)) {
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ebb_state.stats.spurious++;
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goto out;
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}
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ebb_state.stats.ebb_count++;
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trace_log_counter(ebb_state.trace, ebb_state.stats.ebb_count);
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val = mfspr(SPRN_MMCR0);
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trace_log_reg(ebb_state.trace, SPRN_MMCR0, val);
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found = 0;
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for (i = 1; i <= 6; i++) {
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if (ebb_state.pmc_enable[PMC_INDEX(i)])
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found += count_pmc(i, sample_period);
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}
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if (!found)
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ebb_state.stats.no_overflow++;
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out:
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reset_ebb();
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}
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extern void ebb_handler(void);
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void setup_ebb_handler(void (*callee)(void))
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{
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u64 entry;
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#if defined(_CALL_ELF) && _CALL_ELF == 2
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entry = (u64)ebb_handler;
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#else
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struct opd
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{
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u64 entry;
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u64 toc;
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} *opd;
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opd = (struct opd *)ebb_handler;
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entry = opd->entry;
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#endif
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printf("EBB Handler is at %#llx\n", entry);
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ebb_user_func = callee;
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/* Ensure ebb_user_func is set before we set the handler */
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mb();
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mtspr(SPRN_EBBHR, entry);
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/* Make sure the handler is set before we return */
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mb();
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}
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void clear_ebb_stats(void)
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{
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memset(&ebb_state.stats, 0, sizeof(ebb_state.stats));
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}
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void dump_summary_ebb_state(void)
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{
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printf("ebb_state:\n" \
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" ebb_count = %d\n" \
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" spurious = %d\n" \
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" negative = %d\n" \
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" no_overflow = %d\n" \
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" pmc[1] count = 0x%llx\n" \
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" pmc[2] count = 0x%llx\n" \
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" pmc[3] count = 0x%llx\n" \
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" pmc[4] count = 0x%llx\n" \
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" pmc[5] count = 0x%llx\n" \
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" pmc[6] count = 0x%llx\n",
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ebb_state.stats.ebb_count, ebb_state.stats.spurious,
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ebb_state.stats.negative, ebb_state.stats.no_overflow,
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ebb_state.stats.pmc_count[0], ebb_state.stats.pmc_count[1],
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ebb_state.stats.pmc_count[2], ebb_state.stats.pmc_count[3],
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ebb_state.stats.pmc_count[4], ebb_state.stats.pmc_count[5]);
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}
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static char *decode_mmcr0(u32 value)
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{
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static char buf[16];
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buf[0] = '\0';
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if (value & (1 << 31))
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strcat(buf, "FC ");
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if (value & (1 << 26))
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strcat(buf, "PMAE ");
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if (value & (1 << 7))
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strcat(buf, "PMAO ");
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return buf;
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}
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static char *decode_bescr(u64 value)
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{
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static char buf[16];
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buf[0] = '\0';
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if (value & (1ull << 63))
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strcat(buf, "GE ");
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if (value & (1ull << 32))
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strcat(buf, "PMAE ");
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if (value & 1)
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strcat(buf, "PMAO ");
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return buf;
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}
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void dump_ebb_hw_state(void)
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{
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u64 bescr;
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u32 mmcr0;
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mmcr0 = mfspr(SPRN_MMCR0);
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bescr = mfspr(SPRN_BESCR);
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printf("HW state:\n" \
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"MMCR0 0x%016x %s\n" \
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"MMCR2 0x%016lx\n" \
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"EBBHR 0x%016lx\n" \
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"BESCR 0x%016llx %s\n" \
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"PMC1 0x%016lx\n" \
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"PMC2 0x%016lx\n" \
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"PMC3 0x%016lx\n" \
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"PMC4 0x%016lx\n" \
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"PMC5 0x%016lx\n" \
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"PMC6 0x%016lx\n" \
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"SIAR 0x%016lx\n",
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mmcr0, decode_mmcr0(mmcr0), mfspr(SPRN_MMCR2),
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mfspr(SPRN_EBBHR), bescr, decode_bescr(bescr),
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mfspr(SPRN_PMC1), mfspr(SPRN_PMC2), mfspr(SPRN_PMC3),
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mfspr(SPRN_PMC4), mfspr(SPRN_PMC5), mfspr(SPRN_PMC6),
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mfspr(SPRN_SIAR));
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}
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void dump_ebb_state(void)
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{
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dump_summary_ebb_state();
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dump_ebb_hw_state();
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trace_buffer_print(ebb_state.trace);
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}
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int count_pmc(int pmc, uint32_t sample_period)
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{
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uint32_t start_value;
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u64 val;
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/* 0) Read PMC */
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start_value = pmc_sample_period(sample_period);
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val = read_pmc(pmc);
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if (val < start_value)
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ebb_state.stats.negative++;
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else
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ebb_state.stats.pmc_count[PMC_INDEX(pmc)] += val - start_value;
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trace_log_reg(ebb_state.trace, SPRN_PMC1 + pmc - 1, val);
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/* 1) Reset PMC */
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write_pmc(pmc, start_value);
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/* Report if we overflowed */
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return val >= COUNTER_OVERFLOW;
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}
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int ebb_event_enable(struct event *e)
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{
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int rc;
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/* Ensure any SPR writes are ordered vs us */
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mb();
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rc = ioctl(e->fd, PERF_EVENT_IOC_ENABLE);
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if (rc)
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return rc;
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rc = event_read(e);
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/* Ditto */
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mb();
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return rc;
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}
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void ebb_freeze_pmcs(void)
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{
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mtspr(SPRN_MMCR0, mfspr(SPRN_MMCR0) | MMCR0_FC);
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mb();
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}
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void ebb_unfreeze_pmcs(void)
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{
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/* Unfreeze counters */
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mtspr(SPRN_MMCR0, mfspr(SPRN_MMCR0) & ~MMCR0_FC);
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mb();
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}
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void ebb_global_enable(void)
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{
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/* Enable EBBs globally and PMU EBBs */
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mtspr(SPRN_BESCR, 0x8000000100000000ull);
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mb();
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}
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void ebb_global_disable(void)
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{
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/* Disable EBBs & freeze counters, events are still scheduled */
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mtspr(SPRN_BESCRR, BESCR_PME);
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mb();
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}
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bool ebb_is_supported(void)
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{
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#ifdef PPC_FEATURE2_EBB
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/* EBB requires at least POWER8 */
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return have_hwcap2(PPC_FEATURE2_EBB);
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#else
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return false;
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#endif
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}
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void event_ebb_init(struct event *e)
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{
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e->attr.config |= (1ull << 63);
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}
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void event_bhrb_init(struct event *e, unsigned ifm)
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{
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e->attr.config |= (1ull << 62) | ((u64)ifm << 60);
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}
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void event_leader_ebb_init(struct event *e)
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{
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event_ebb_init(e);
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e->attr.exclusive = 1;
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e->attr.pinned = 1;
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}
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int ebb_child(union pipe read_pipe, union pipe write_pipe)
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{
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struct event event;
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uint64_t val;
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FAIL_IF(wait_for_parent(read_pipe));
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event_init_named(&event, 0x1001e, "cycles");
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event_leader_ebb_init(&event);
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event.attr.exclude_kernel = 1;
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event.attr.exclude_hv = 1;
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event.attr.exclude_idle = 1;
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FAIL_IF(event_open(&event));
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ebb_enable_pmc_counting(1);
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setup_ebb_handler(standard_ebb_callee);
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ebb_global_enable();
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FAIL_IF(event_enable(&event));
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if (event_read(&event)) {
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/*
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* Some tests expect to fail here, so don't report an error on
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* this line, and return a distinguisable error code. Tell the
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* parent an error happened.
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*/
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notify_parent_of_error(write_pipe);
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return 2;
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}
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mtspr(SPRN_PMC1, pmc_sample_period(sample_period));
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FAIL_IF(notify_parent(write_pipe));
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FAIL_IF(wait_for_parent(read_pipe));
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FAIL_IF(notify_parent(write_pipe));
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while (ebb_state.stats.ebb_count < 20) {
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FAIL_IF(core_busy_loop());
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/* To try and hit SIGILL case */
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val = mfspr(SPRN_MMCRA);
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val |= mfspr(SPRN_MMCR2);
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val |= mfspr(SPRN_MMCR0);
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}
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ebb_global_disable();
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ebb_freeze_pmcs();
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dump_ebb_state();
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event_close(&event);
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FAIL_IF(ebb_state.stats.ebb_count == 0);
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return 0;
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}
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static jmp_buf setjmp_env;
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static void sigill_handler(int signal)
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{
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printf("Took sigill\n");
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longjmp(setjmp_env, 1);
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}
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static struct sigaction sigill_action = {
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.sa_handler = sigill_handler,
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};
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int catch_sigill(void (*func)(void))
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{
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if (sigaction(SIGILL, &sigill_action, NULL)) {
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perror("sigaction");
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return 1;
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}
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if (setjmp(setjmp_env) == 0) {
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func();
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return 1;
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}
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return 0;
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}
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void write_pmc1(void)
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{
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mtspr(SPRN_PMC1, 0);
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}
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void write_pmc(int pmc, u64 value)
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{
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switch (pmc) {
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case 1: mtspr(SPRN_PMC1, value); break;
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case 2: mtspr(SPRN_PMC2, value); break;
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case 3: mtspr(SPRN_PMC3, value); break;
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case 4: mtspr(SPRN_PMC4, value); break;
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case 5: mtspr(SPRN_PMC5, value); break;
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case 6: mtspr(SPRN_PMC6, value); break;
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}
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}
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u64 read_pmc(int pmc)
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{
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switch (pmc) {
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case 1: return mfspr(SPRN_PMC1);
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case 2: return mfspr(SPRN_PMC2);
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case 3: return mfspr(SPRN_PMC3);
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case 4: return mfspr(SPRN_PMC4);
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case 5: return mfspr(SPRN_PMC5);
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case 6: return mfspr(SPRN_PMC6);
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}
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return 0;
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}
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static void term_handler(int signal)
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{
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dump_summary_ebb_state();
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dump_ebb_hw_state();
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abort();
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}
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struct sigaction term_action = {
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.sa_handler = term_handler,
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};
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static void __attribute__((constructor)) ebb_init(void)
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{
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clear_ebb_stats();
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if (sigaction(SIGTERM, &term_action, NULL))
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perror("sigaction");
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ebb_state.trace = trace_buffer_allocate(1 * 1024 * 1024);
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}
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