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| 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/compiler.h> |
| 16 | +#include <linux/zalloc.h> |
| 17 | + |
| 18 | +#include "../auxtrace.h" |
| 19 | +#include "../debug.h" |
| 20 | +#include "../util.h" |
| 21 | + |
| 22 | +#include "arm-spe-decoder.h" |
| 23 | + |
| 24 | +#ifndef BIT |
| 25 | +#define BIT(n) (1UL << (n)) |
| 26 | +#endif |
| 27 | + |
| 28 | +static u64 arm_spe_calc_ip(int index, u64 payload) |
| 29 | +{ |
| 30 | + u8 *addr = (u8 *)&payload; |
| 31 | + int ns, el; |
| 32 | + |
| 33 | + /* Instruction virtual address or Branch target address */ |
| 34 | + if (index == SPE_ADDR_PKT_HDR_INDEX_INS || |
| 35 | + index == SPE_ADDR_PKT_HDR_INDEX_BRANCH) { |
| 36 | + ns = addr[7] & SPE_ADDR_PKT_NS; |
| 37 | + el = (addr[7] & SPE_ADDR_PKT_EL_MASK) >> SPE_ADDR_PKT_EL_OFFSET; |
| 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 | + addr[7] = 0xff; |
| 42 | + /* Clean highest byte for other cases */ |
| 43 | + else |
| 44 | + addr[7] = 0x0; |
| 45 | + |
| 46 | + /* Data access virtual address */ |
| 47 | + } else if (index == SPE_ADDR_PKT_HDR_INDEX_DATA_VIRT) { |
| 48 | + |
| 49 | + /* Fill highest byte if bits [48..55] is 0xff */ |
| 50 | + if (addr[6] == 0xff) |
| 51 | + addr[7] = 0xff; |
| 52 | + /* Otherwise, cleanup tags */ |
| 53 | + else |
| 54 | + addr[7] = 0x0; |
| 55 | + |
| 56 | + /* Data access physical address */ |
| 57 | + } else if (index == SPE_ADDR_PKT_HDR_INDEX_DATA_PHYS) { |
| 58 | + /* Cleanup byte 7 */ |
| 59 | + addr[7] = 0x0; |
| 60 | + } else { |
| 61 | + pr_err("unsupported address packet index: 0x%x\n", index); |
| 62 | + } |
| 63 | + |
| 64 | + return payload; |
| 65 | +} |
| 66 | + |
| 67 | +struct arm_spe_decoder *arm_spe_decoder_new(struct arm_spe_params *params) |
| 68 | +{ |
| 69 | + struct arm_spe_decoder *decoder; |
| 70 | + |
| 71 | + if (!params->get_trace) |
| 72 | + return NULL; |
| 73 | + |
| 74 | + decoder = zalloc(sizeof(struct arm_spe_decoder)); |
| 75 | + if (!decoder) |
| 76 | + return NULL; |
| 77 | + |
| 78 | + decoder->get_trace = params->get_trace; |
| 79 | + decoder->data = params->data; |
| 80 | + |
| 81 | + return decoder; |
| 82 | +} |
| 83 | + |
| 84 | +void arm_spe_decoder_free(struct arm_spe_decoder *decoder) |
| 85 | +{ |
| 86 | + free(decoder); |
| 87 | +} |
| 88 | + |
| 89 | +static int arm_spe_get_data(struct arm_spe_decoder *decoder) |
| 90 | +{ |
| 91 | + struct arm_spe_buffer buffer = { .buf = 0, }; |
| 92 | + int ret; |
| 93 | + |
| 94 | + pr_debug("Getting more data\n"); |
| 95 | + ret = decoder->get_trace(&buffer, decoder->data); |
| 96 | + if (ret < 0) |
| 97 | + return ret; |
| 98 | + |
| 99 | + decoder->buf = buffer.buf; |
| 100 | + decoder->len = buffer.len; |
| 101 | + |
| 102 | + if (!decoder->len) |
| 103 | + pr_debug("No more data\n"); |
| 104 | + |
| 105 | + return decoder->len; |
| 106 | +} |
| 107 | + |
| 108 | +static int arm_spe_get_next_packet(struct arm_spe_decoder *decoder) |
| 109 | +{ |
| 110 | + int ret; |
| 111 | + |
| 112 | + do { |
| 113 | + if (!decoder->len) { |
| 114 | + ret = arm_spe_get_data(decoder); |
| 115 | + |
| 116 | + /* Failed to read out trace data */ |
| 117 | + if (ret <= 0) |
| 118 | + return ret; |
| 119 | + } |
| 120 | + |
| 121 | + ret = arm_spe_get_packet(decoder->buf, decoder->len, |
| 122 | + &decoder->packet); |
| 123 | + if (ret <= 0) { |
| 124 | + /* Move forward for 1 byte */ |
| 125 | + decoder->buf += 1; |
| 126 | + decoder->len -= 1; |
| 127 | + return -EBADMSG; |
| 128 | + } |
| 129 | + |
| 130 | + decoder->buf += ret; |
| 131 | + decoder->len -= ret; |
| 132 | + } while (decoder->packet.type == ARM_SPE_PAD); |
| 133 | + |
| 134 | + return 1; |
| 135 | +} |
| 136 | + |
| 137 | +static int arm_spe_read_record(struct arm_spe_decoder *decoder) |
| 138 | +{ |
| 139 | + int err; |
| 140 | + int idx; |
| 141 | + u64 payload, ip; |
| 142 | + |
| 143 | + memset(&decoder->record, 0x0, sizeof(decoder->record)); |
| 144 | + |
| 145 | + while (1) { |
| 146 | + err = arm_spe_get_next_packet(decoder); |
| 147 | + if (err <= 0) |
| 148 | + return err; |
| 149 | + |
| 150 | + idx = decoder->packet.index; |
| 151 | + payload = decoder->packet.payload; |
| 152 | + |
| 153 | + switch (decoder->packet.type) { |
| 154 | + case ARM_SPE_TIMESTAMP: |
| 155 | + decoder->record.timestamp = payload; |
| 156 | + return 1; |
| 157 | + case ARM_SPE_END: |
| 158 | + return 1; |
| 159 | + case ARM_SPE_ADDRESS: |
| 160 | + ip = arm_spe_calc_ip(idx, payload); |
| 161 | + if (idx == SPE_ADDR_PKT_HDR_INDEX_INS) |
| 162 | + decoder->record.from_ip = ip; |
| 163 | + else if (idx == SPE_ADDR_PKT_HDR_INDEX_BRANCH) |
| 164 | + decoder->record.to_ip = ip; |
| 165 | + break; |
| 166 | + case ARM_SPE_COUNTER: |
| 167 | + break; |
| 168 | + case ARM_SPE_CONTEXT: |
| 169 | + break; |
| 170 | + case ARM_SPE_OP_TYPE: |
| 171 | + break; |
| 172 | + case ARM_SPE_EVENTS: |
| 173 | + if (payload & BIT(EV_L1D_REFILL)) |
| 174 | + decoder->record.type |= ARM_SPE_L1D_MISS; |
| 175 | + |
| 176 | + if (payload & BIT(EV_L1D_ACCESS)) |
| 177 | + decoder->record.type |= ARM_SPE_L1D_ACCESS; |
| 178 | + |
| 179 | + if (payload & BIT(EV_TLB_WALK)) |
| 180 | + decoder->record.type |= ARM_SPE_TLB_MISS; |
| 181 | + |
| 182 | + if (payload & BIT(EV_TLB_ACCESS)) |
| 183 | + decoder->record.type |= ARM_SPE_TLB_ACCESS; |
| 184 | + |
| 185 | + if ((idx == 1 || idx == 2 || idx == 3) && |
| 186 | + (payload & BIT(EV_LLC_MISS))) |
| 187 | + decoder->record.type |= ARM_SPE_LLC_MISS; |
| 188 | + |
| 189 | + if ((idx == 1 || idx == 2 || idx == 3) && |
| 190 | + (payload & BIT(EV_LLC_ACCESS))) |
| 191 | + decoder->record.type |= ARM_SPE_LLC_ACCESS; |
| 192 | + |
| 193 | + if ((idx == 1 || idx == 2 || idx == 3) && |
| 194 | + (payload & BIT(EV_REMOTE_ACCESS))) |
| 195 | + decoder->record.type |= ARM_SPE_REMOTE_ACCESS; |
| 196 | + |
| 197 | + if (payload & BIT(EV_MISPRED)) |
| 198 | + decoder->record.type |= ARM_SPE_BRANCH_MISS; |
| 199 | + |
| 200 | + break; |
| 201 | + case ARM_SPE_DATA_SOURCE: |
| 202 | + break; |
| 203 | + case ARM_SPE_BAD: |
| 204 | + break; |
| 205 | + case ARM_SPE_PAD: |
| 206 | + break; |
| 207 | + default: |
| 208 | + pr_err("Get packet error!\n"); |
| 209 | + return -1; |
| 210 | + } |
| 211 | + } |
| 212 | + |
| 213 | + return 0; |
| 214 | +} |
| 215 | + |
| 216 | +int arm_spe_decode(struct arm_spe_decoder *decoder) |
| 217 | +{ |
| 218 | + return arm_spe_read_record(decoder); |
| 219 | +} |
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