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 ns = SPE_ADDR_PKT_GET_NS(payload); 33 el = SPE_ADDR_PKT_GET_EL(payload); 34 35 /* Clean highest byte */ 36 payload = SPE_ADDR_PKT_ADDR_GET_BYTES_0_6(payload); 37 38 /* Fill highest byte for EL1 or EL2 (VHE) mode */ 39 if (ns && (el == SPE_ADDR_PKT_EL1 || el == SPE_ADDR_PKT_EL2)) 40 payload |= 0xffULL << SPE_ADDR_PKT_ADDR_BYTE7_SHIFT; 41 42 /* Data access virtual address */ 43 } else if (index == SPE_ADDR_PKT_HDR_INDEX_DATA_VIRT) { 44 45 /* Clean tags */ 46 payload = SPE_ADDR_PKT_ADDR_GET_BYTES_0_6(payload); 47 48 /* 49 * Armv8 ARM (ARM DDI 0487F.c), chapter "D10.2.1 Address packet" 50 * defines the data virtual address payload format, the top byte 51 * (bits [63:56]) is assigned as top-byte tag; so we only can 52 * retrieve address value from bits [55:0]. 53 * 54 * According to Documentation/arm64/memory.rst, if detects the 55 * specific pattern in bits [55:52] of payload which falls in 56 * the kernel space, should fixup the top byte and this allows 57 * perf tool to parse DSO symbol for data address correctly. 58 * 59 * For this reason, if detects the bits [55:52] is 0xf, will 60 * fill 0xff into the top byte. 61 */ 62 val = SPE_ADDR_PKT_ADDR_GET_BYTE_6(payload); 63 if ((val & 0xf0ULL) == 0xf0ULL) 64 payload |= 0xffULL << SPE_ADDR_PKT_ADDR_BYTE7_SHIFT; 65 66 /* Data access physical address */ 67 } else if (index == SPE_ADDR_PKT_HDR_INDEX_DATA_PHYS) { 68 /* Clean highest byte */ 69 payload = SPE_ADDR_PKT_ADDR_GET_BYTES_0_6(payload); 70 } else { 71 pr_err("unsupported address packet index: 0x%x\n", index); 72 } 73 74 return payload; 75 } 76 77 struct arm_spe_decoder *arm_spe_decoder_new(struct arm_spe_params *params) 78 { 79 struct arm_spe_decoder *decoder; 80 81 if (!params->get_trace) 82 return NULL; 83 84 decoder = zalloc(sizeof(struct arm_spe_decoder)); 85 if (!decoder) 86 return NULL; 87 88 decoder->get_trace = params->get_trace; 89 decoder->data = params->data; 90 91 return decoder; 92 } 93 94 void arm_spe_decoder_free(struct arm_spe_decoder *decoder) 95 { 96 free(decoder); 97 } 98 99 static int arm_spe_get_data(struct arm_spe_decoder *decoder) 100 { 101 struct arm_spe_buffer buffer = { .buf = 0, }; 102 int ret; 103 104 pr_debug("Getting more data\n"); 105 ret = decoder->get_trace(&buffer, decoder->data); 106 if (ret < 0) 107 return ret; 108 109 decoder->buf = buffer.buf; 110 decoder->len = buffer.len; 111 112 if (!decoder->len) 113 pr_debug("No more data\n"); 114 115 return decoder->len; 116 } 117 118 static int arm_spe_get_next_packet(struct arm_spe_decoder *decoder) 119 { 120 int ret; 121 122 do { 123 if (!decoder->len) { 124 ret = arm_spe_get_data(decoder); 125 126 /* Failed to read out trace data */ 127 if (ret <= 0) 128 return ret; 129 } 130 131 ret = arm_spe_get_packet(decoder->buf, decoder->len, 132 &decoder->packet); 133 if (ret <= 0) { 134 /* Move forward for 1 byte */ 135 decoder->buf += 1; 136 decoder->len -= 1; 137 return -EBADMSG; 138 } 139 140 decoder->buf += ret; 141 decoder->len -= ret; 142 } while (decoder->packet.type == ARM_SPE_PAD); 143 144 return 1; 145 } 146 147 static int arm_spe_read_record(struct arm_spe_decoder *decoder) 148 { 149 int err; 150 int idx; 151 u64 payload, ip; 152 153 memset(&decoder->record, 0x0, sizeof(decoder->record)); 154 decoder->record.context_id = (u64)-1; 155 156 while (1) { 157 err = arm_spe_get_next_packet(decoder); 158 if (err <= 0) 159 return err; 160 161 idx = decoder->packet.index; 162 payload = decoder->packet.payload; 163 164 switch (decoder->packet.type) { 165 case ARM_SPE_TIMESTAMP: 166 decoder->record.timestamp = payload; 167 return 1; 168 case ARM_SPE_END: 169 return 1; 170 case ARM_SPE_ADDRESS: 171 ip = arm_spe_calc_ip(idx, payload); 172 if (idx == SPE_ADDR_PKT_HDR_INDEX_INS) 173 decoder->record.from_ip = ip; 174 else if (idx == SPE_ADDR_PKT_HDR_INDEX_BRANCH) 175 decoder->record.to_ip = ip; 176 else if (idx == SPE_ADDR_PKT_HDR_INDEX_DATA_VIRT) 177 decoder->record.virt_addr = ip; 178 else if (idx == SPE_ADDR_PKT_HDR_INDEX_DATA_PHYS) 179 decoder->record.phys_addr = ip; 180 break; 181 case ARM_SPE_COUNTER: 182 if (idx == SPE_CNT_PKT_HDR_INDEX_TOTAL_LAT) 183 decoder->record.latency = payload; 184 break; 185 case ARM_SPE_CONTEXT: 186 decoder->record.context_id = payload; 187 break; 188 case ARM_SPE_OP_TYPE: 189 if (idx == SPE_OP_PKT_HDR_CLASS_LD_ST_ATOMIC) { 190 if (payload & 0x1) 191 decoder->record.op = ARM_SPE_ST; 192 else 193 decoder->record.op = ARM_SPE_LD; 194 } 195 break; 196 case ARM_SPE_EVENTS: 197 if (payload & BIT(EV_L1D_REFILL)) 198 decoder->record.type |= ARM_SPE_L1D_MISS; 199 200 if (payload & BIT(EV_L1D_ACCESS)) 201 decoder->record.type |= ARM_SPE_L1D_ACCESS; 202 203 if (payload & BIT(EV_TLB_WALK)) 204 decoder->record.type |= ARM_SPE_TLB_MISS; 205 206 if (payload & BIT(EV_TLB_ACCESS)) 207 decoder->record.type |= ARM_SPE_TLB_ACCESS; 208 209 if (payload & BIT(EV_LLC_MISS)) 210 decoder->record.type |= ARM_SPE_LLC_MISS; 211 212 if (payload & BIT(EV_LLC_ACCESS)) 213 decoder->record.type |= ARM_SPE_LLC_ACCESS; 214 215 if (payload & BIT(EV_REMOTE_ACCESS)) 216 decoder->record.type |= ARM_SPE_REMOTE_ACCESS; 217 218 if (payload & BIT(EV_MISPRED)) 219 decoder->record.type |= ARM_SPE_BRANCH_MISS; 220 221 break; 222 case ARM_SPE_DATA_SOURCE: 223 decoder->record.source = payload; 224 break; 225 case ARM_SPE_BAD: 226 break; 227 case ARM_SPE_PAD: 228 break; 229 default: 230 pr_err("Get packet error!\n"); 231 return -1; 232 } 233 } 234 235 return 0; 236 } 237 238 int arm_spe_decode(struct arm_spe_decoder *decoder) 239 { 240 return arm_spe_read_record(decoder); 241 } 242