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da650ada10
Also based on the RFI and entry flush tests, it counts the L1D misses by doing a syscall that does user access: uname, in this case. Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@canonical.com> [dja: forward port, rename function] Signed-off-by: Daniel Axtens <dja@axtens.net> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20210225061949.1213404-1-dja@axtens.net
84 lines
1.7 KiB
C
84 lines
1.7 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright 2018 IBM Corporation.
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*/
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#define __SANE_USERSPACE_TYPES__
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#include <sys/types.h>
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#include <stdint.h>
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#include <unistd.h>
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#include <signal.h>
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#include <stdlib.h>
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#include <string.h>
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#include <stdio.h>
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#include <sys/utsname.h>
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#include "utils.h"
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#include "flush_utils.h"
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static inline __u64 load(void *addr)
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{
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__u64 tmp;
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asm volatile("ld %0,0(%1)" : "=r"(tmp) : "b"(addr));
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return tmp;
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}
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void syscall_loop(char *p, unsigned long iterations,
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unsigned long zero_size)
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{
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for (unsigned long i = 0; i < iterations; i++) {
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for (unsigned long j = 0; j < zero_size; j += CACHELINE_SIZE)
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load(p + j);
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getppid();
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}
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}
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void syscall_loop_uaccess(char *p, unsigned long iterations,
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unsigned long zero_size)
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{
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struct utsname utsname;
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for (unsigned long i = 0; i < iterations; i++) {
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for (unsigned long j = 0; j < zero_size; j += CACHELINE_SIZE)
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load(p + j);
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uname(&utsname);
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}
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}
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static void sigill_handler(int signr, siginfo_t *info, void *unused)
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{
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static int warned;
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ucontext_t *ctx = (ucontext_t *)unused;
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unsigned long *pc = &UCONTEXT_NIA(ctx);
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/* mtspr 3,RS to check for move to DSCR below */
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if ((*((unsigned int *)*pc) & 0xfc1fffff) == 0x7c0303a6) {
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if (!warned++)
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printf("WARNING: Skipping over dscr setup. Consider running 'ppc64_cpu --dscr=1' manually.\n");
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*pc += 4;
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} else {
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printf("SIGILL at %p\n", pc);
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abort();
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}
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}
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void set_dscr(unsigned long val)
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{
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static int init;
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struct sigaction sa;
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if (!init) {
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memset(&sa, 0, sizeof(sa));
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sa.sa_sigaction = sigill_handler;
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sa.sa_flags = SA_SIGINFO;
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if (sigaction(SIGILL, &sa, NULL))
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perror("sigill_handler");
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init = 1;
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}
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asm volatile("mtspr %1,%0" : : "r" (val), "i" (SPRN_DSCR));
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}
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