1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * arm_spe_decoder.c: ARM SPE support 4 */ 5 6 #ifndef _GNU_SOURCE 7 #define _GNU_SOURCE 8 #endif 9 #include <errno.h> 10 #include <inttypes.h> 11 #include <stdbool.h> 12 #include <string.h> 13 #include <stdint.h> 14 #include <stdlib.h> 15 #include <linux/bitops.h> 16 #include <linux/compiler.h> 17 #include <linux/zalloc.h> 18 19 #include "../auxtrace.h" 20 #include "../debug.h" 21 #include "../util.h" 22 23 #include "arm-spe-decoder.h" 24 25 static u64 arm_spe_calc_ip(int index, u64 payload) 26 { 27 u64 ns, el, val; 28 29 /* Instruction virtual address or Branch target address */ 30 if (index == SPE_ADDR_PKT_HDR_INDEX_INS || 31 index == SPE_ADDR_PKT_HDR_INDEX_BRANCH || 32 index == SPE_ADDR_PKT_HDR_INDEX_PREV_BRANCH) { 33 ns = SPE_ADDR_PKT_GET_NS(payload); 34 el = SPE_ADDR_PKT_GET_EL(payload); 35 36 /* Clean highest byte */ 37 payload = SPE_ADDR_PKT_ADDR_GET_BYTES_0_6(payload); 38 39 /* Fill highest byte for EL1 or EL2 (VHE) mode */ 40 if (ns && (el == SPE_ADDR_PKT_EL1 || el == SPE_ADDR_PKT_EL2)) 41 payload |= 0xffULL << SPE_ADDR_PKT_ADDR_BYTE7_SHIFT; 42 43 /* Data access virtual address */ 44 } else if (index == SPE_ADDR_PKT_HDR_INDEX_DATA_VIRT) { 45 46 /* Clean tags */ 47 payload = SPE_ADDR_PKT_ADDR_GET_BYTES_0_6(payload); 48 49 /* 50 * Armv8 ARM (ARM DDI 0487F.c), chapter "D10.2.1 Address packet" 51 * defines the data virtual address payload format, the top byte 52 * (bits [63:56]) is assigned as top-byte tag; so we only can 53 * retrieve address value from bits [55:0]. 54 * 55 * According to Documentation/arch/arm64/memory.rst, if detects the 56 * specific pattern in bits [55:52] of payload which falls in 57 * the kernel space, should fixup the top byte and this allows 58 * perf tool to parse DSO symbol for data address correctly. 59 * 60 * For this reason, if detects the bits [55:52] is 0xf, will 61 * fill 0xff into the top byte. 62 */ 63 val = SPE_ADDR_PKT_ADDR_GET_BYTE_6(payload); 64 if ((val & 0xf0ULL) == 0xf0ULL) 65 payload |= 0xffULL << SPE_ADDR_PKT_ADDR_BYTE7_SHIFT; 66 67 /* Data access physical address */ 68 } else if (index == SPE_ADDR_PKT_HDR_INDEX_DATA_PHYS) { 69 /* Clean highest byte */ 70 payload = SPE_ADDR_PKT_ADDR_GET_BYTES_0_6(payload); 71 } else { 72 static u32 seen_idx = 0; 73 if (!(seen_idx & BIT(index))) { 74 seen_idx |= BIT(index); 75 pr_warning("ignoring unsupported address packet index: 0x%x\n", index); 76 } 77 } 78 79 return payload; 80 } 81 82 struct arm_spe_decoder *arm_spe_decoder_new(struct arm_spe_params *params) 83 { 84 struct arm_spe_decoder *decoder; 85 86 if (!params->get_trace) 87 return NULL; 88 89 decoder = zalloc(sizeof(struct arm_spe_decoder)); 90 if (!decoder) 91 return NULL; 92 93 decoder->get_trace = params->get_trace; 94 decoder->data = params->data; 95 96 return decoder; 97 } 98 99 void arm_spe_decoder_free(struct arm_spe_decoder *decoder) 100 { 101 free(decoder); 102 } 103 104 static int arm_spe_get_data(struct arm_spe_decoder *decoder) 105 { 106 struct arm_spe_buffer buffer = { .buf = 0, }; 107 int ret; 108 109 pr_debug("Getting more data\n"); 110 ret = decoder->get_trace(&buffer, decoder->data); 111 if (ret < 0) 112 return ret; 113 114 decoder->buf = buffer.buf; 115 decoder->len = buffer.len; 116 117 if (!decoder->len) 118 pr_debug("No more data\n"); 119 120 return decoder->len; 121 } 122 123 static int arm_spe_get_next_packet(struct arm_spe_decoder *decoder) 124 { 125 int ret; 126 127 do { 128 if (!decoder->len) { 129 ret = arm_spe_get_data(decoder); 130 131 /* Failed to read out trace data */ 132 if (ret <= 0) 133 return ret; 134 } 135 136 ret = arm_spe_get_packet(decoder->buf, decoder->len, 137 &decoder->packet); 138 if (ret <= 0) { 139 /* Move forward for 1 byte */ 140 decoder->buf += 1; 141 decoder->len -= 1; 142 return -EBADMSG; 143 } 144 145 decoder->buf += ret; 146 decoder->len -= ret; 147 } while (decoder->packet.type == ARM_SPE_PAD); 148 149 return 1; 150 } 151 152 static int arm_spe_read_record(struct arm_spe_decoder *decoder) 153 { 154 int err; 155 int idx; 156 u64 payload, ip; 157 158 memset(&decoder->record, 0x0, sizeof(decoder->record)); 159 decoder->record.context_id = (u64)-1; 160 161 while (1) { 162 err = arm_spe_get_next_packet(decoder); 163 if (err <= 0) 164 return err; 165 166 idx = decoder->packet.index; 167 payload = decoder->packet.payload; 168 169 switch (decoder->packet.type) { 170 case ARM_SPE_TIMESTAMP: 171 decoder->record.timestamp = payload; 172 return 1; 173 case ARM_SPE_END: 174 return 1; 175 case ARM_SPE_ADDRESS: 176 ip = arm_spe_calc_ip(idx, payload); 177 if (idx == SPE_ADDR_PKT_HDR_INDEX_INS) 178 decoder->record.from_ip = ip; 179 else if (idx == SPE_ADDR_PKT_HDR_INDEX_BRANCH) 180 decoder->record.to_ip = ip; 181 else if (idx == SPE_ADDR_PKT_HDR_INDEX_DATA_VIRT) 182 decoder->record.virt_addr = ip; 183 else if (idx == SPE_ADDR_PKT_HDR_INDEX_DATA_PHYS) 184 decoder->record.phys_addr = ip; 185 else if (idx == SPE_ADDR_PKT_HDR_INDEX_PREV_BRANCH) 186 decoder->record.prev_br_tgt = ip; 187 break; 188 case ARM_SPE_COUNTER: 189 if (idx == SPE_CNT_PKT_HDR_INDEX_TOTAL_LAT) 190 decoder->record.latency = payload; 191 break; 192 case ARM_SPE_CONTEXT: 193 decoder->record.context_id = payload; 194 break; 195 case ARM_SPE_OP_TYPE: 196 switch (idx) { 197 case SPE_OP_PKT_HDR_CLASS_LD_ST_ATOMIC: 198 decoder->record.op |= ARM_SPE_OP_LDST; 199 if (payload & SPE_OP_PKT_ST) 200 decoder->record.op |= ARM_SPE_OP_ST; 201 else 202 decoder->record.op |= ARM_SPE_OP_LD; 203 if (SPE_OP_PKT_IS_LDST_SVE(payload)) 204 decoder->record.op |= ARM_SPE_OP_SVE_LDST; 205 break; 206 case SPE_OP_PKT_HDR_CLASS_OTHER: 207 decoder->record.op |= ARM_SPE_OP_OTHER; 208 if (SPE_OP_PKT_IS_OTHER_SVE_OP(payload)) 209 decoder->record.op |= ARM_SPE_OP_SVE_OTHER; 210 break; 211 case SPE_OP_PKT_HDR_CLASS_BR_ERET: 212 decoder->record.op |= ARM_SPE_OP_BRANCH_ERET; 213 if (payload & SPE_OP_PKT_COND) 214 decoder->record.op |= ARM_SPE_OP_BR_COND; 215 if (payload & SPE_OP_PKT_INDIRECT_BRANCH) 216 decoder->record.op |= ARM_SPE_OP_BR_INDIRECT; 217 if (payload & SPE_OP_PKT_GCS) 218 decoder->record.op |= ARM_SPE_OP_BR_GCS; 219 if (SPE_OP_PKT_CR_BL(payload)) 220 decoder->record.op |= ARM_SPE_OP_BR_CR_BL; 221 if (SPE_OP_PKT_CR_RET(payload)) 222 decoder->record.op |= ARM_SPE_OP_BR_CR_RET; 223 if (SPE_OP_PKT_CR_NON_BL_RET(payload)) 224 decoder->record.op |= ARM_SPE_OP_BR_CR_NON_BL_RET; 225 break; 226 default: 227 pr_err("Get packet error!\n"); 228 return -1; 229 } 230 break; 231 case ARM_SPE_EVENTS: 232 if (payload & BIT(EV_L1D_REFILL)) 233 decoder->record.type |= ARM_SPE_L1D_MISS; 234 235 if (payload & BIT(EV_L1D_ACCESS)) 236 decoder->record.type |= ARM_SPE_L1D_ACCESS; 237 238 if (payload & BIT(EV_TLB_WALK)) 239 decoder->record.type |= ARM_SPE_TLB_MISS; 240 241 if (payload & BIT(EV_TLB_ACCESS)) 242 decoder->record.type |= ARM_SPE_TLB_ACCESS; 243 244 if (payload & BIT(EV_LLC_MISS)) 245 decoder->record.type |= ARM_SPE_LLC_MISS; 246 247 if (payload & BIT(EV_LLC_ACCESS)) 248 decoder->record.type |= ARM_SPE_LLC_ACCESS; 249 250 if (payload & BIT(EV_REMOTE_ACCESS)) 251 decoder->record.type |= ARM_SPE_REMOTE_ACCESS; 252 253 if (payload & BIT(EV_MISPRED)) 254 decoder->record.type |= ARM_SPE_BRANCH_MISS; 255 256 if (payload & BIT(EV_NOT_TAKEN)) 257 decoder->record.type |= ARM_SPE_BRANCH_NOT_TAKEN; 258 259 if (payload & BIT(EV_TRANSACTIONAL)) 260 decoder->record.type |= ARM_SPE_IN_TXN; 261 262 if (payload & BIT(EV_PARTIAL_PREDICATE)) 263 decoder->record.type |= ARM_SPE_SVE_PARTIAL_PRED; 264 265 if (payload & BIT(EV_EMPTY_PREDICATE)) 266 decoder->record.type |= ARM_SPE_SVE_EMPTY_PRED; 267 268 break; 269 case ARM_SPE_DATA_SOURCE: 270 decoder->record.source = payload; 271 break; 272 case ARM_SPE_BAD: 273 break; 274 case ARM_SPE_PAD: 275 break; 276 default: 277 pr_err("Get packet error!\n"); 278 return -1; 279 } 280 } 281 282 return 0; 283 } 284 285 int arm_spe_decode(struct arm_spe_decoder *decoder) 286 { 287 return arm_spe_read_record(decoder); 288 } 289