perf_regs.c (6285B)
1// SPDX-License-Identifier: GPL-2.0 2#include <errno.h> 3#include <string.h> 4#include <regex.h> 5#include <linux/zalloc.h> 6 7#include "../../../util/perf_regs.h" 8#include "../../../util/debug.h" 9#include "../../../util/event.h" 10#include "../../../util/header.h" 11#include "../../../perf-sys.h" 12#include "utils_header.h" 13 14#include <linux/kernel.h> 15 16#define PVR_POWER9 0x004E 17#define PVR_POWER10 0x0080 18 19const struct sample_reg sample_reg_masks[] = { 20 SMPL_REG(r0, PERF_REG_POWERPC_R0), 21 SMPL_REG(r1, PERF_REG_POWERPC_R1), 22 SMPL_REG(r2, PERF_REG_POWERPC_R2), 23 SMPL_REG(r3, PERF_REG_POWERPC_R3), 24 SMPL_REG(r4, PERF_REG_POWERPC_R4), 25 SMPL_REG(r5, PERF_REG_POWERPC_R5), 26 SMPL_REG(r6, PERF_REG_POWERPC_R6), 27 SMPL_REG(r7, PERF_REG_POWERPC_R7), 28 SMPL_REG(r8, PERF_REG_POWERPC_R8), 29 SMPL_REG(r9, PERF_REG_POWERPC_R9), 30 SMPL_REG(r10, PERF_REG_POWERPC_R10), 31 SMPL_REG(r11, PERF_REG_POWERPC_R11), 32 SMPL_REG(r12, PERF_REG_POWERPC_R12), 33 SMPL_REG(r13, PERF_REG_POWERPC_R13), 34 SMPL_REG(r14, PERF_REG_POWERPC_R14), 35 SMPL_REG(r15, PERF_REG_POWERPC_R15), 36 SMPL_REG(r16, PERF_REG_POWERPC_R16), 37 SMPL_REG(r17, PERF_REG_POWERPC_R17), 38 SMPL_REG(r18, PERF_REG_POWERPC_R18), 39 SMPL_REG(r19, PERF_REG_POWERPC_R19), 40 SMPL_REG(r20, PERF_REG_POWERPC_R20), 41 SMPL_REG(r21, PERF_REG_POWERPC_R21), 42 SMPL_REG(r22, PERF_REG_POWERPC_R22), 43 SMPL_REG(r23, PERF_REG_POWERPC_R23), 44 SMPL_REG(r24, PERF_REG_POWERPC_R24), 45 SMPL_REG(r25, PERF_REG_POWERPC_R25), 46 SMPL_REG(r26, PERF_REG_POWERPC_R26), 47 SMPL_REG(r27, PERF_REG_POWERPC_R27), 48 SMPL_REG(r28, PERF_REG_POWERPC_R28), 49 SMPL_REG(r29, PERF_REG_POWERPC_R29), 50 SMPL_REG(r30, PERF_REG_POWERPC_R30), 51 SMPL_REG(r31, PERF_REG_POWERPC_R31), 52 SMPL_REG(nip, PERF_REG_POWERPC_NIP), 53 SMPL_REG(msr, PERF_REG_POWERPC_MSR), 54 SMPL_REG(orig_r3, PERF_REG_POWERPC_ORIG_R3), 55 SMPL_REG(ctr, PERF_REG_POWERPC_CTR), 56 SMPL_REG(link, PERF_REG_POWERPC_LINK), 57 SMPL_REG(xer, PERF_REG_POWERPC_XER), 58 SMPL_REG(ccr, PERF_REG_POWERPC_CCR), 59 SMPL_REG(softe, PERF_REG_POWERPC_SOFTE), 60 SMPL_REG(trap, PERF_REG_POWERPC_TRAP), 61 SMPL_REG(dar, PERF_REG_POWERPC_DAR), 62 SMPL_REG(dsisr, PERF_REG_POWERPC_DSISR), 63 SMPL_REG(sier, PERF_REG_POWERPC_SIER), 64 SMPL_REG(mmcra, PERF_REG_POWERPC_MMCRA), 65 SMPL_REG(mmcr0, PERF_REG_POWERPC_MMCR0), 66 SMPL_REG(mmcr1, PERF_REG_POWERPC_MMCR1), 67 SMPL_REG(mmcr2, PERF_REG_POWERPC_MMCR2), 68 SMPL_REG(mmcr3, PERF_REG_POWERPC_MMCR3), 69 SMPL_REG(sier2, PERF_REG_POWERPC_SIER2), 70 SMPL_REG(sier3, PERF_REG_POWERPC_SIER3), 71 SMPL_REG(pmc1, PERF_REG_POWERPC_PMC1), 72 SMPL_REG(pmc2, PERF_REG_POWERPC_PMC2), 73 SMPL_REG(pmc3, PERF_REG_POWERPC_PMC3), 74 SMPL_REG(pmc4, PERF_REG_POWERPC_PMC4), 75 SMPL_REG(pmc5, PERF_REG_POWERPC_PMC5), 76 SMPL_REG(pmc6, PERF_REG_POWERPC_PMC6), 77 SMPL_REG(sdar, PERF_REG_POWERPC_SDAR), 78 SMPL_REG(siar, PERF_REG_POWERPC_SIAR), 79 SMPL_REG_END 80}; 81 82/* REG or %rREG */ 83#define SDT_OP_REGEX1 "^(%r)?([1-2]?[0-9]|3[0-1])$" 84 85/* -NUM(REG) or NUM(REG) or -NUM(%rREG) or NUM(%rREG) */ 86#define SDT_OP_REGEX2 "^(\\-)?([0-9]+)\\((%r)?([1-2]?[0-9]|3[0-1])\\)$" 87 88static regex_t sdt_op_regex1, sdt_op_regex2; 89 90static int sdt_init_op_regex(void) 91{ 92 static int initialized; 93 int ret = 0; 94 95 if (initialized) 96 return 0; 97 98 ret = regcomp(&sdt_op_regex1, SDT_OP_REGEX1, REG_EXTENDED); 99 if (ret) 100 goto error; 101 102 ret = regcomp(&sdt_op_regex2, SDT_OP_REGEX2, REG_EXTENDED); 103 if (ret) 104 goto free_regex1; 105 106 initialized = 1; 107 return 0; 108 109free_regex1: 110 regfree(&sdt_op_regex1); 111error: 112 pr_debug4("Regex compilation error.\n"); 113 return ret; 114} 115 116/* 117 * Parse OP and convert it into uprobe format, which is, +/-NUM(%gprREG). 118 * Possible variants of OP are: 119 * Format Example 120 * ------------------------- 121 * NUM(REG) 48(18) 122 * -NUM(REG) -48(18) 123 * NUM(%rREG) 48(%r18) 124 * -NUM(%rREG) -48(%r18) 125 * REG 18 126 * %rREG %r18 127 * iNUM i0 128 * i-NUM i-1 129 * 130 * SDT marker arguments on Powerpc uses %rREG form with -mregnames flag 131 * and REG form with -mno-regnames. Here REG is general purpose register, 132 * which is in 0 to 31 range. 133 */ 134int arch_sdt_arg_parse_op(char *old_op, char **new_op) 135{ 136 int ret, new_len; 137 regmatch_t rm[5]; 138 char prefix; 139 140 /* Constant argument. Uprobe does not support it */ 141 if (old_op[0] == 'i') { 142 pr_debug4("Skipping unsupported SDT argument: %s\n", old_op); 143 return SDT_ARG_SKIP; 144 } 145 146 ret = sdt_init_op_regex(); 147 if (ret < 0) 148 return ret; 149 150 if (!regexec(&sdt_op_regex1, old_op, 3, rm, 0)) { 151 /* REG or %rREG --> %gprREG */ 152 153 new_len = 5; /* % g p r NULL */ 154 new_len += (int)(rm[2].rm_eo - rm[2].rm_so); 155 156 *new_op = zalloc(new_len); 157 if (!*new_op) 158 return -ENOMEM; 159 160 scnprintf(*new_op, new_len, "%%gpr%.*s", 161 (int)(rm[2].rm_eo - rm[2].rm_so), old_op + rm[2].rm_so); 162 } else if (!regexec(&sdt_op_regex2, old_op, 5, rm, 0)) { 163 /* 164 * -NUM(REG) or NUM(REG) or -NUM(%rREG) or NUM(%rREG) --> 165 * +/-NUM(%gprREG) 166 */ 167 prefix = (rm[1].rm_so == -1) ? '+' : '-'; 168 169 new_len = 8; /* +/- ( % g p r ) NULL */ 170 new_len += (int)(rm[2].rm_eo - rm[2].rm_so); 171 new_len += (int)(rm[4].rm_eo - rm[4].rm_so); 172 173 *new_op = zalloc(new_len); 174 if (!*new_op) 175 return -ENOMEM; 176 177 scnprintf(*new_op, new_len, "%c%.*s(%%gpr%.*s)", prefix, 178 (int)(rm[2].rm_eo - rm[2].rm_so), old_op + rm[2].rm_so, 179 (int)(rm[4].rm_eo - rm[4].rm_so), old_op + rm[4].rm_so); 180 } else { 181 pr_debug4("Skipping unsupported SDT argument: %s\n", old_op); 182 return SDT_ARG_SKIP; 183 } 184 185 return SDT_ARG_VALID; 186} 187 188uint64_t arch__intr_reg_mask(void) 189{ 190 struct perf_event_attr attr = { 191 .type = PERF_TYPE_HARDWARE, 192 .config = PERF_COUNT_HW_CPU_CYCLES, 193 .sample_type = PERF_SAMPLE_REGS_INTR, 194 .precise_ip = 1, 195 .disabled = 1, 196 .exclude_kernel = 1, 197 }; 198 int fd; 199 u32 version; 200 u64 extended_mask = 0, mask = PERF_REGS_MASK; 201 202 /* 203 * Get the PVR value to set the extended 204 * mask specific to platform. 205 */ 206 version = (((mfspr(SPRN_PVR)) >> 16) & 0xFFFF); 207 if (version == PVR_POWER9) 208 extended_mask = PERF_REG_PMU_MASK_300; 209 else if (version == PVR_POWER10) 210 extended_mask = PERF_REG_PMU_MASK_31; 211 else 212 return mask; 213 214 attr.sample_regs_intr = extended_mask; 215 attr.sample_period = 1; 216 event_attr_init(&attr); 217 218 /* 219 * check if the pmu supports perf extended regs, before 220 * returning the register mask to sample. 221 */ 222 fd = sys_perf_event_open(&attr, 0, -1, -1, 0); 223 if (fd != -1) { 224 close(fd); 225 mask |= extended_mask; 226 } 227 return mask; 228}