1 // SPDX-License-Identifier: GPL-2.0 2 // Copyright (C) 2016-2020 Arm Limited 3 // CMN-600 Coherent Mesh Network PMU driver 4 5 #include <linux/acpi.h> 6 #include <linux/bitfield.h> 7 #include <linux/bitops.h> 8 #include <linux/interrupt.h> 9 #include <linux/io.h> 10 #include <linux/kernel.h> 11 #include <linux/list.h> 12 #include <linux/module.h> 13 #include <linux/of.h> 14 #include <linux/perf_event.h> 15 #include <linux/platform_device.h> 16 #include <linux/slab.h> 17 #include <linux/sort.h> 18 19 /* Common register stuff */ 20 #define CMN_NODE_INFO 0x0000 21 #define CMN_NI_NODE_TYPE GENMASK_ULL(15, 0) 22 #define CMN_NI_NODE_ID GENMASK_ULL(31, 16) 23 #define CMN_NI_LOGICAL_ID GENMASK_ULL(47, 32) 24 25 #define CMN_NODEID_DEVID(reg) ((reg) & 3) 26 #define CMN_NODEID_PID(reg) (((reg) >> 2) & 1) 27 #define CMN_NODEID_X(reg, bits) ((reg) >> (3 + (bits))) 28 #define CMN_NODEID_Y(reg, bits) (((reg) >> 3) & ((1U << (bits)) - 1)) 29 30 #define CMN_CHILD_INFO 0x0080 31 #define CMN_CI_CHILD_COUNT GENMASK_ULL(15, 0) 32 #define CMN_CI_CHILD_PTR_OFFSET GENMASK_ULL(31, 16) 33 34 #define CMN_CHILD_NODE_ADDR GENMASK(27,0) 35 #define CMN_CHILD_NODE_EXTERNAL BIT(31) 36 37 #define CMN_ADDR_NODE_PTR GENMASK(27, 14) 38 39 #define CMN_NODE_PTR_DEVID(ptr) (((ptr) >> 2) & 3) 40 #define CMN_NODE_PTR_PID(ptr) ((ptr) & 1) 41 #define CMN_NODE_PTR_X(ptr, bits) ((ptr) >> (6 + (bits))) 42 #define CMN_NODE_PTR_Y(ptr, bits) (((ptr) >> 6) & ((1U << (bits)) - 1)) 43 44 #define CMN_MAX_XPS (8 * 8) 45 46 /* The CFG node has one other useful purpose */ 47 #define CMN_CFGM_PERIPH_ID_2 0x0010 48 #define CMN_CFGM_PID2_REVISION GENMASK(7, 4) 49 50 /* PMU registers occupy the 3rd 4KB page of each node's 16KB space */ 51 #define CMN_PMU_OFFSET 0x2000 52 53 /* For most nodes, this is all there is */ 54 #define CMN_PMU_EVENT_SEL 0x000 55 #define CMN_PMU_EVENTn_ID_SHIFT(n) ((n) * 8) 56 57 /* DTMs live in the PMU space of XP registers */ 58 #define CMN_DTM_WPn(n) (0x1A0 + (n) * 0x18) 59 #define CMN_DTM_WPn_CONFIG(n) (CMN_DTM_WPn(n) + 0x00) 60 #define CMN_DTM_WPn_CONFIG_WP_COMBINE BIT(6) 61 #define CMN_DTM_WPn_CONFIG_WP_EXCLUSIVE BIT(5) 62 #define CMN_DTM_WPn_CONFIG_WP_GRP BIT(4) 63 #define CMN_DTM_WPn_CONFIG_WP_CHN_SEL GENMASK_ULL(3, 1) 64 #define CMN_DTM_WPn_CONFIG_WP_DEV_SEL BIT(0) 65 #define CMN_DTM_WPn_VAL(n) (CMN_DTM_WPn(n) + 0x08) 66 #define CMN_DTM_WPn_MASK(n) (CMN_DTM_WPn(n) + 0x10) 67 68 #define CMN_DTM_PMU_CONFIG 0x210 69 #define CMN__PMEVCNT0_INPUT_SEL GENMASK_ULL(37, 32) 70 #define CMN__PMEVCNT0_INPUT_SEL_WP 0x00 71 #define CMN__PMEVCNT0_INPUT_SEL_XP 0x04 72 #define CMN__PMEVCNT0_INPUT_SEL_DEV 0x10 73 #define CMN__PMEVCNT0_GLOBAL_NUM GENMASK_ULL(18, 16) 74 #define CMN__PMEVCNTn_GLOBAL_NUM_SHIFT(n) ((n) * 4) 75 #define CMN__PMEVCNT_PAIRED(n) BIT(4 + (n)) 76 #define CMN__PMEVCNT23_COMBINED BIT(2) 77 #define CMN__PMEVCNT01_COMBINED BIT(1) 78 #define CMN_DTM_PMU_CONFIG_PMU_EN BIT(0) 79 80 #define CMN_DTM_PMEVCNT 0x220 81 82 #define CMN_DTM_PMEVCNTSR 0x240 83 84 #define CMN_DTM_NUM_COUNTERS 4 85 86 /* The DTC node is where the magic happens */ 87 #define CMN_DT_DTC_CTL 0x0a00 88 #define CMN_DT_DTC_CTL_DT_EN BIT(0) 89 90 /* DTC counters are paired in 64-bit registers on a 16-byte stride. Yuck */ 91 #define _CMN_DT_CNT_REG(n) ((((n) / 2) * 4 + (n) % 2) * 4) 92 #define CMN_DT_PMEVCNT(n) (CMN_PMU_OFFSET + _CMN_DT_CNT_REG(n)) 93 #define CMN_DT_PMCCNTR (CMN_PMU_OFFSET + 0x40) 94 95 #define CMN_DT_PMEVCNTSR(n) (CMN_PMU_OFFSET + 0x50 + _CMN_DT_CNT_REG(n)) 96 #define CMN_DT_PMCCNTRSR (CMN_PMU_OFFSET + 0x90) 97 98 #define CMN_DT_PMCR (CMN_PMU_OFFSET + 0x100) 99 #define CMN_DT_PMCR_PMU_EN BIT(0) 100 #define CMN_DT_PMCR_CNTR_RST BIT(5) 101 #define CMN_DT_PMCR_OVFL_INTR_EN BIT(6) 102 103 #define CMN_DT_PMOVSR (CMN_PMU_OFFSET + 0x118) 104 #define CMN_DT_PMOVSR_CLR (CMN_PMU_OFFSET + 0x120) 105 106 #define CMN_DT_PMSSR (CMN_PMU_OFFSET + 0x128) 107 #define CMN_DT_PMSSR_SS_STATUS(n) BIT(n) 108 109 #define CMN_DT_PMSRR (CMN_PMU_OFFSET + 0x130) 110 #define CMN_DT_PMSRR_SS_REQ BIT(0) 111 112 #define CMN_DT_NUM_COUNTERS 8 113 #define CMN_MAX_DTCS 4 114 115 /* 116 * Even in the worst case a DTC counter can't wrap in fewer than 2^42 cycles, 117 * so throwing away one bit to make overflow handling easy is no big deal. 118 */ 119 #define CMN_COUNTER_INIT 0x80000000 120 /* Similarly for the 40-bit cycle counter */ 121 #define CMN_CC_INIT 0x8000000000ULL 122 123 124 /* Event attributes */ 125 #define CMN_CONFIG_TYPE GENMASK(15, 0) 126 #define CMN_CONFIG_EVENTID GENMASK(23, 16) 127 #define CMN_CONFIG_OCCUPID GENMASK(27, 24) 128 #define CMN_CONFIG_BYNODEID BIT(31) 129 #define CMN_CONFIG_NODEID GENMASK(47, 32) 130 131 #define CMN_EVENT_TYPE(event) FIELD_GET(CMN_CONFIG_TYPE, (event)->attr.config) 132 #define CMN_EVENT_EVENTID(event) FIELD_GET(CMN_CONFIG_EVENTID, (event)->attr.config) 133 #define CMN_EVENT_OCCUPID(event) FIELD_GET(CMN_CONFIG_OCCUPID, (event)->attr.config) 134 #define CMN_EVENT_BYNODEID(event) FIELD_GET(CMN_CONFIG_BYNODEID, (event)->attr.config) 135 #define CMN_EVENT_NODEID(event) FIELD_GET(CMN_CONFIG_NODEID, (event)->attr.config) 136 137 #define CMN_CONFIG_WP_COMBINE GENMASK(27, 24) 138 #define CMN_CONFIG_WP_DEV_SEL BIT(48) 139 #define CMN_CONFIG_WP_CHN_SEL GENMASK(50, 49) 140 #define CMN_CONFIG_WP_GRP BIT(52) 141 #define CMN_CONFIG_WP_EXCLUSIVE BIT(53) 142 #define CMN_CONFIG1_WP_VAL GENMASK(63, 0) 143 #define CMN_CONFIG2_WP_MASK GENMASK(63, 0) 144 145 #define CMN_EVENT_WP_COMBINE(event) FIELD_GET(CMN_CONFIG_WP_COMBINE, (event)->attr.config) 146 #define CMN_EVENT_WP_DEV_SEL(event) FIELD_GET(CMN_CONFIG_WP_DEV_SEL, (event)->attr.config) 147 #define CMN_EVENT_WP_CHN_SEL(event) FIELD_GET(CMN_CONFIG_WP_CHN_SEL, (event)->attr.config) 148 #define CMN_EVENT_WP_GRP(event) FIELD_GET(CMN_CONFIG_WP_GRP, (event)->attr.config) 149 #define CMN_EVENT_WP_EXCLUSIVE(event) FIELD_GET(CMN_CONFIG_WP_EXCLUSIVE, (event)->attr.config) 150 #define CMN_EVENT_WP_VAL(event) FIELD_GET(CMN_CONFIG1_WP_VAL, (event)->attr.config1) 151 #define CMN_EVENT_WP_MASK(event) FIELD_GET(CMN_CONFIG2_WP_MASK, (event)->attr.config2) 152 153 /* Made-up event IDs for watchpoint direction */ 154 #define CMN_WP_UP 0 155 #define CMN_WP_DOWN 2 156 157 158 /* r0px probably don't exist in silicon, thankfully */ 159 enum cmn_revision { 160 CMN600_R1P0, 161 CMN600_R1P1, 162 CMN600_R1P2, 163 CMN600_R1P3, 164 CMN600_R2P0, 165 CMN600_R3P0, 166 }; 167 168 enum cmn_node_type { 169 CMN_TYPE_INVALID, 170 CMN_TYPE_DVM, 171 CMN_TYPE_CFG, 172 CMN_TYPE_DTC, 173 CMN_TYPE_HNI, 174 CMN_TYPE_HNF, 175 CMN_TYPE_XP, 176 CMN_TYPE_SBSX, 177 CMN_TYPE_RNI = 0xa, 178 CMN_TYPE_RND = 0xd, 179 CMN_TYPE_RNSAM = 0xf, 180 CMN_TYPE_CXRA = 0x100, 181 CMN_TYPE_CXHA = 0x101, 182 CMN_TYPE_CXLA = 0x102, 183 /* Not a real node type */ 184 CMN_TYPE_WP = 0x7770 185 }; 186 187 struct arm_cmn_node { 188 void __iomem *pmu_base; 189 u16 id, logid; 190 enum cmn_node_type type; 191 192 union { 193 /* Device node */ 194 struct { 195 int to_xp; 196 /* DN/HN-F/CXHA */ 197 unsigned int occupid_val; 198 unsigned int occupid_count; 199 }; 200 /* XP */ 201 struct { 202 int dtc; 203 u32 pmu_config_low; 204 union { 205 u8 input_sel[4]; 206 __le32 pmu_config_high; 207 }; 208 s8 wp_event[4]; 209 }; 210 }; 211 212 union { 213 u8 event[4]; 214 __le32 event_sel; 215 }; 216 }; 217 218 struct arm_cmn_dtc { 219 void __iomem *base; 220 int irq; 221 int irq_friend; 222 bool cc_active; 223 224 struct perf_event *counters[CMN_DT_NUM_COUNTERS]; 225 struct perf_event *cycles; 226 }; 227 228 #define CMN_STATE_DISABLED BIT(0) 229 #define CMN_STATE_TXN BIT(1) 230 231 struct arm_cmn { 232 struct device *dev; 233 void __iomem *base; 234 235 enum cmn_revision rev; 236 u8 mesh_x; 237 u8 mesh_y; 238 u16 num_xps; 239 u16 num_dns; 240 struct arm_cmn_node *xps; 241 struct arm_cmn_node *dns; 242 243 struct arm_cmn_dtc *dtc; 244 unsigned int num_dtcs; 245 246 int cpu; 247 struct hlist_node cpuhp_node; 248 249 unsigned int state; 250 struct pmu pmu; 251 }; 252 253 #define to_cmn(p) container_of(p, struct arm_cmn, pmu) 254 255 static int arm_cmn_hp_state; 256 257 struct arm_cmn_hw_event { 258 struct arm_cmn_node *dn; 259 u64 dtm_idx[2]; 260 unsigned int dtc_idx; 261 u8 dtcs_used; 262 u8 num_dns; 263 }; 264 265 #define for_each_hw_dn(hw, dn, i) \ 266 for (i = 0, dn = hw->dn; i < hw->num_dns; i++, dn++) 267 268 static struct arm_cmn_hw_event *to_cmn_hw(struct perf_event *event) 269 { 270 BUILD_BUG_ON(sizeof(struct arm_cmn_hw_event) > offsetof(struct hw_perf_event, target)); 271 return (struct arm_cmn_hw_event *)&event->hw; 272 } 273 274 static void arm_cmn_set_index(u64 x[], unsigned int pos, unsigned int val) 275 { 276 x[pos / 32] |= (u64)val << ((pos % 32) * 2); 277 } 278 279 static unsigned int arm_cmn_get_index(u64 x[], unsigned int pos) 280 { 281 return (x[pos / 32] >> ((pos % 32) * 2)) & 3; 282 } 283 284 struct arm_cmn_event_attr { 285 struct device_attribute attr; 286 enum cmn_node_type type; 287 u8 eventid; 288 u8 occupid; 289 }; 290 291 struct arm_cmn_format_attr { 292 struct device_attribute attr; 293 u64 field; 294 int config; 295 }; 296 297 static int arm_cmn_xyidbits(const struct arm_cmn *cmn) 298 { 299 return cmn->mesh_x > 4 || cmn->mesh_y > 4 ? 3 : 2; 300 } 301 302 static void arm_cmn_init_node_to_xp(const struct arm_cmn *cmn, 303 struct arm_cmn_node *dn) 304 { 305 int bits = arm_cmn_xyidbits(cmn); 306 int x = CMN_NODEID_X(dn->id, bits); 307 int y = CMN_NODEID_Y(dn->id, bits); 308 int xp_idx = cmn->mesh_x * y + x; 309 310 dn->to_xp = (cmn->xps + xp_idx) - dn; 311 } 312 313 static struct arm_cmn_node *arm_cmn_node_to_xp(struct arm_cmn_node *dn) 314 { 315 return dn->type == CMN_TYPE_XP ? dn : dn + dn->to_xp; 316 } 317 318 static struct arm_cmn_node *arm_cmn_node(const struct arm_cmn *cmn, 319 enum cmn_node_type type) 320 { 321 int i; 322 323 for (i = 0; i < cmn->num_dns; i++) 324 if (cmn->dns[i].type == type) 325 return &cmn->dns[i]; 326 return NULL; 327 } 328 329 #define CMN_EVENT_ATTR(_name, _type, _eventid, _occupid) \ 330 (&((struct arm_cmn_event_attr[]) {{ \ 331 .attr = __ATTR(_name, 0444, arm_cmn_event_show, NULL), \ 332 .type = _type, \ 333 .eventid = _eventid, \ 334 .occupid = _occupid, \ 335 }})[0].attr.attr) 336 337 static bool arm_cmn_is_occup_event(enum cmn_node_type type, unsigned int id) 338 { 339 return (type == CMN_TYPE_DVM && id == 0x05) || 340 (type == CMN_TYPE_HNF && id == 0x0f); 341 } 342 343 static ssize_t arm_cmn_event_show(struct device *dev, 344 struct device_attribute *attr, char *buf) 345 { 346 struct arm_cmn_event_attr *eattr; 347 348 eattr = container_of(attr, typeof(*eattr), attr); 349 350 if (eattr->type == CMN_TYPE_DTC) 351 return snprintf(buf, PAGE_SIZE, "type=0x%x\n", eattr->type); 352 353 if (eattr->type == CMN_TYPE_WP) 354 return snprintf(buf, PAGE_SIZE, 355 "type=0x%x,eventid=0x%x,wp_dev_sel=?,wp_chn_sel=?,wp_grp=?,wp_val=?,wp_mask=?\n", 356 eattr->type, eattr->eventid); 357 358 if (arm_cmn_is_occup_event(eattr->type, eattr->eventid)) 359 return snprintf(buf, PAGE_SIZE, "type=0x%x,eventid=0x%x,occupid=0x%x\n", 360 eattr->type, eattr->eventid, eattr->occupid); 361 362 return snprintf(buf, PAGE_SIZE, "type=0x%x,eventid=0x%x\n", 363 eattr->type, eattr->eventid); 364 } 365 366 static umode_t arm_cmn_event_attr_is_visible(struct kobject *kobj, 367 struct attribute *attr, 368 int unused) 369 { 370 struct device *dev = kobj_to_dev(kobj); 371 struct arm_cmn *cmn = to_cmn(dev_get_drvdata(dev)); 372 struct arm_cmn_event_attr *eattr; 373 enum cmn_node_type type; 374 375 eattr = container_of(attr, typeof(*eattr), attr.attr); 376 type = eattr->type; 377 378 /* Watchpoints aren't nodes */ 379 if (type == CMN_TYPE_WP) 380 type = CMN_TYPE_XP; 381 382 /* Revision-specific differences */ 383 if (cmn->rev < CMN600_R1P2) { 384 if (type == CMN_TYPE_HNF && eattr->eventid == 0x1b) 385 return 0; 386 } 387 388 if (!arm_cmn_node(cmn, type)) 389 return 0; 390 391 return attr->mode; 392 } 393 394 #define _CMN_EVENT_DVM(_name, _event, _occup) \ 395 CMN_EVENT_ATTR(dn_##_name, CMN_TYPE_DVM, _event, _occup) 396 #define CMN_EVENT_DTC(_name) \ 397 CMN_EVENT_ATTR(dtc_##_name, CMN_TYPE_DTC, 0, 0) 398 #define _CMN_EVENT_HNF(_name, _event, _occup) \ 399 CMN_EVENT_ATTR(hnf_##_name, CMN_TYPE_HNF, _event, _occup) 400 #define CMN_EVENT_HNI(_name, _event) \ 401 CMN_EVENT_ATTR(hni_##_name, CMN_TYPE_HNI, _event, 0) 402 #define __CMN_EVENT_XP(_name, _event) \ 403 CMN_EVENT_ATTR(mxp_##_name, CMN_TYPE_XP, _event, 0) 404 #define CMN_EVENT_SBSX(_name, _event) \ 405 CMN_EVENT_ATTR(sbsx_##_name, CMN_TYPE_SBSX, _event, 0) 406 #define CMN_EVENT_RNID(_name, _event) \ 407 CMN_EVENT_ATTR(rnid_##_name, CMN_TYPE_RNI, _event, 0) 408 409 #define CMN_EVENT_DVM(_name, _event) \ 410 _CMN_EVENT_DVM(_name, _event, 0) 411 #define CMN_EVENT_HNF(_name, _event) \ 412 _CMN_EVENT_HNF(_name, _event, 0) 413 #define _CMN_EVENT_XP(_name, _event) \ 414 __CMN_EVENT_XP(e_##_name, (_event) | (0 << 2)), \ 415 __CMN_EVENT_XP(w_##_name, (_event) | (1 << 2)), \ 416 __CMN_EVENT_XP(n_##_name, (_event) | (2 << 2)), \ 417 __CMN_EVENT_XP(s_##_name, (_event) | (3 << 2)), \ 418 __CMN_EVENT_XP(p0_##_name, (_event) | (4 << 2)), \ 419 __CMN_EVENT_XP(p1_##_name, (_event) | (5 << 2)) 420 421 /* Good thing there are only 3 fundamental XP events... */ 422 #define CMN_EVENT_XP(_name, _event) \ 423 _CMN_EVENT_XP(req_##_name, (_event) | (0 << 5)), \ 424 _CMN_EVENT_XP(rsp_##_name, (_event) | (1 << 5)), \ 425 _CMN_EVENT_XP(snp_##_name, (_event) | (2 << 5)), \ 426 _CMN_EVENT_XP(dat_##_name, (_event) | (3 << 5)) 427 428 429 static struct attribute *arm_cmn_event_attrs[] = { 430 CMN_EVENT_DTC(cycles), 431 432 /* 433 * DVM node events conflict with HN-I events in the equivalent PMU 434 * slot, but our lazy short-cut of using the DTM counter index for 435 * the PMU index as well happens to avoid that by construction. 436 */ 437 CMN_EVENT_DVM(rxreq_dvmop, 0x01), 438 CMN_EVENT_DVM(rxreq_dvmsync, 0x02), 439 CMN_EVENT_DVM(rxreq_dvmop_vmid_filtered, 0x03), 440 CMN_EVENT_DVM(rxreq_retried, 0x04), 441 _CMN_EVENT_DVM(rxreq_trk_occupancy_all, 0x05, 0), 442 _CMN_EVENT_DVM(rxreq_trk_occupancy_dvmop, 0x05, 1), 443 _CMN_EVENT_DVM(rxreq_trk_occupancy_dvmsync, 0x05, 2), 444 445 CMN_EVENT_HNF(cache_miss, 0x01), 446 CMN_EVENT_HNF(slc_sf_cache_access, 0x02), 447 CMN_EVENT_HNF(cache_fill, 0x03), 448 CMN_EVENT_HNF(pocq_retry, 0x04), 449 CMN_EVENT_HNF(pocq_reqs_recvd, 0x05), 450 CMN_EVENT_HNF(sf_hit, 0x06), 451 CMN_EVENT_HNF(sf_evictions, 0x07), 452 CMN_EVENT_HNF(dir_snoops_sent, 0x08), 453 CMN_EVENT_HNF(brd_snoops_sent, 0x09), 454 CMN_EVENT_HNF(slc_eviction, 0x0a), 455 CMN_EVENT_HNF(slc_fill_invalid_way, 0x0b), 456 CMN_EVENT_HNF(mc_retries, 0x0c), 457 CMN_EVENT_HNF(mc_reqs, 0x0d), 458 CMN_EVENT_HNF(qos_hh_retry, 0x0e), 459 _CMN_EVENT_HNF(qos_pocq_occupancy_all, 0x0f, 0), 460 _CMN_EVENT_HNF(qos_pocq_occupancy_read, 0x0f, 1), 461 _CMN_EVENT_HNF(qos_pocq_occupancy_write, 0x0f, 2), 462 _CMN_EVENT_HNF(qos_pocq_occupancy_atomic, 0x0f, 3), 463 _CMN_EVENT_HNF(qos_pocq_occupancy_stash, 0x0f, 4), 464 CMN_EVENT_HNF(pocq_addrhaz, 0x10), 465 CMN_EVENT_HNF(pocq_atomic_addrhaz, 0x11), 466 CMN_EVENT_HNF(ld_st_swp_adq_full, 0x12), 467 CMN_EVENT_HNF(cmp_adq_full, 0x13), 468 CMN_EVENT_HNF(txdat_stall, 0x14), 469 CMN_EVENT_HNF(txrsp_stall, 0x15), 470 CMN_EVENT_HNF(seq_full, 0x16), 471 CMN_EVENT_HNF(seq_hit, 0x17), 472 CMN_EVENT_HNF(snp_sent, 0x18), 473 CMN_EVENT_HNF(sfbi_dir_snp_sent, 0x19), 474 CMN_EVENT_HNF(sfbi_brd_snp_sent, 0x1a), 475 CMN_EVENT_HNF(snp_sent_untrk, 0x1b), 476 CMN_EVENT_HNF(intv_dirty, 0x1c), 477 CMN_EVENT_HNF(stash_snp_sent, 0x1d), 478 CMN_EVENT_HNF(stash_data_pull, 0x1e), 479 CMN_EVENT_HNF(snp_fwded, 0x1f), 480 481 CMN_EVENT_HNI(rrt_rd_occ_cnt_ovfl, 0x20), 482 CMN_EVENT_HNI(rrt_wr_occ_cnt_ovfl, 0x21), 483 CMN_EVENT_HNI(rdt_rd_occ_cnt_ovfl, 0x22), 484 CMN_EVENT_HNI(rdt_wr_occ_cnt_ovfl, 0x23), 485 CMN_EVENT_HNI(wdb_occ_cnt_ovfl, 0x24), 486 CMN_EVENT_HNI(rrt_rd_alloc, 0x25), 487 CMN_EVENT_HNI(rrt_wr_alloc, 0x26), 488 CMN_EVENT_HNI(rdt_rd_alloc, 0x27), 489 CMN_EVENT_HNI(rdt_wr_alloc, 0x28), 490 CMN_EVENT_HNI(wdb_alloc, 0x29), 491 CMN_EVENT_HNI(txrsp_retryack, 0x2a), 492 CMN_EVENT_HNI(arvalid_no_arready, 0x2b), 493 CMN_EVENT_HNI(arready_no_arvalid, 0x2c), 494 CMN_EVENT_HNI(awvalid_no_awready, 0x2d), 495 CMN_EVENT_HNI(awready_no_awvalid, 0x2e), 496 CMN_EVENT_HNI(wvalid_no_wready, 0x2f), 497 CMN_EVENT_HNI(txdat_stall, 0x30), 498 CMN_EVENT_HNI(nonpcie_serialization, 0x31), 499 CMN_EVENT_HNI(pcie_serialization, 0x32), 500 501 CMN_EVENT_XP(txflit_valid, 0x01), 502 CMN_EVENT_XP(txflit_stall, 0x02), 503 CMN_EVENT_XP(partial_dat_flit, 0x03), 504 /* We treat watchpoints as a special made-up class of XP events */ 505 CMN_EVENT_ATTR(watchpoint_up, CMN_TYPE_WP, 0, 0), 506 CMN_EVENT_ATTR(watchpoint_down, CMN_TYPE_WP, 2, 0), 507 508 CMN_EVENT_SBSX(rd_req, 0x01), 509 CMN_EVENT_SBSX(wr_req, 0x02), 510 CMN_EVENT_SBSX(cmo_req, 0x03), 511 CMN_EVENT_SBSX(txrsp_retryack, 0x04), 512 CMN_EVENT_SBSX(txdat_flitv, 0x05), 513 CMN_EVENT_SBSX(txrsp_flitv, 0x06), 514 CMN_EVENT_SBSX(rd_req_trkr_occ_cnt_ovfl, 0x11), 515 CMN_EVENT_SBSX(wr_req_trkr_occ_cnt_ovfl, 0x12), 516 CMN_EVENT_SBSX(cmo_req_trkr_occ_cnt_ovfl, 0x13), 517 CMN_EVENT_SBSX(wdb_occ_cnt_ovfl, 0x14), 518 CMN_EVENT_SBSX(rd_axi_trkr_occ_cnt_ovfl, 0x15), 519 CMN_EVENT_SBSX(cmo_axi_trkr_occ_cnt_ovfl, 0x16), 520 CMN_EVENT_SBSX(arvalid_no_arready, 0x21), 521 CMN_EVENT_SBSX(awvalid_no_awready, 0x22), 522 CMN_EVENT_SBSX(wvalid_no_wready, 0x23), 523 CMN_EVENT_SBSX(txdat_stall, 0x24), 524 CMN_EVENT_SBSX(txrsp_stall, 0x25), 525 526 CMN_EVENT_RNID(s0_rdata_beats, 0x01), 527 CMN_EVENT_RNID(s1_rdata_beats, 0x02), 528 CMN_EVENT_RNID(s2_rdata_beats, 0x03), 529 CMN_EVENT_RNID(rxdat_flits, 0x04), 530 CMN_EVENT_RNID(txdat_flits, 0x05), 531 CMN_EVENT_RNID(txreq_flits_total, 0x06), 532 CMN_EVENT_RNID(txreq_flits_retried, 0x07), 533 CMN_EVENT_RNID(rrt_occ_ovfl, 0x08), 534 CMN_EVENT_RNID(wrt_occ_ovfl, 0x09), 535 CMN_EVENT_RNID(txreq_flits_replayed, 0x0a), 536 CMN_EVENT_RNID(wrcancel_sent, 0x0b), 537 CMN_EVENT_RNID(s0_wdata_beats, 0x0c), 538 CMN_EVENT_RNID(s1_wdata_beats, 0x0d), 539 CMN_EVENT_RNID(s2_wdata_beats, 0x0e), 540 CMN_EVENT_RNID(rrt_alloc, 0x0f), 541 CMN_EVENT_RNID(wrt_alloc, 0x10), 542 CMN_EVENT_RNID(rdb_unord, 0x11), 543 CMN_EVENT_RNID(rdb_replay, 0x12), 544 CMN_EVENT_RNID(rdb_hybrid, 0x13), 545 CMN_EVENT_RNID(rdb_ord, 0x14), 546 547 NULL 548 }; 549 550 static const struct attribute_group arm_cmn_event_attrs_group = { 551 .name = "events", 552 .attrs = arm_cmn_event_attrs, 553 .is_visible = arm_cmn_event_attr_is_visible, 554 }; 555 556 static ssize_t arm_cmn_format_show(struct device *dev, 557 struct device_attribute *attr, char *buf) 558 { 559 struct arm_cmn_format_attr *fmt = container_of(attr, typeof(*fmt), attr); 560 int lo = __ffs(fmt->field), hi = __fls(fmt->field); 561 562 if (lo == hi) 563 return snprintf(buf, PAGE_SIZE, "config:%d\n", lo); 564 565 if (!fmt->config) 566 return snprintf(buf, PAGE_SIZE, "config:%d-%d\n", lo, hi); 567 568 return snprintf(buf, PAGE_SIZE, "config%d:%d-%d\n", fmt->config, lo, hi); 569 } 570 571 #define _CMN_FORMAT_ATTR(_name, _cfg, _fld) \ 572 (&((struct arm_cmn_format_attr[]) {{ \ 573 .attr = __ATTR(_name, 0444, arm_cmn_format_show, NULL), \ 574 .config = _cfg, \ 575 .field = _fld, \ 576 }})[0].attr.attr) 577 #define CMN_FORMAT_ATTR(_name, _fld) _CMN_FORMAT_ATTR(_name, 0, _fld) 578 579 static struct attribute *arm_cmn_format_attrs[] = { 580 CMN_FORMAT_ATTR(type, CMN_CONFIG_TYPE), 581 CMN_FORMAT_ATTR(eventid, CMN_CONFIG_EVENTID), 582 CMN_FORMAT_ATTR(occupid, CMN_CONFIG_OCCUPID), 583 CMN_FORMAT_ATTR(bynodeid, CMN_CONFIG_BYNODEID), 584 CMN_FORMAT_ATTR(nodeid, CMN_CONFIG_NODEID), 585 586 CMN_FORMAT_ATTR(wp_dev_sel, CMN_CONFIG_WP_DEV_SEL), 587 CMN_FORMAT_ATTR(wp_chn_sel, CMN_CONFIG_WP_CHN_SEL), 588 CMN_FORMAT_ATTR(wp_grp, CMN_CONFIG_WP_GRP), 589 CMN_FORMAT_ATTR(wp_exclusive, CMN_CONFIG_WP_EXCLUSIVE), 590 CMN_FORMAT_ATTR(wp_combine, CMN_CONFIG_WP_COMBINE), 591 592 _CMN_FORMAT_ATTR(wp_val, 1, CMN_CONFIG1_WP_VAL), 593 _CMN_FORMAT_ATTR(wp_mask, 2, CMN_CONFIG2_WP_MASK), 594 595 NULL 596 }; 597 598 static const struct attribute_group arm_cmn_format_attrs_group = { 599 .name = "format", 600 .attrs = arm_cmn_format_attrs, 601 }; 602 603 static ssize_t arm_cmn_cpumask_show(struct device *dev, 604 struct device_attribute *attr, char *buf) 605 { 606 struct arm_cmn *cmn = to_cmn(dev_get_drvdata(dev)); 607 608 return cpumap_print_to_pagebuf(true, buf, cpumask_of(cmn->cpu)); 609 } 610 611 static struct device_attribute arm_cmn_cpumask_attr = 612 __ATTR(cpumask, 0444, arm_cmn_cpumask_show, NULL); 613 614 static struct attribute *arm_cmn_cpumask_attrs[] = { 615 &arm_cmn_cpumask_attr.attr, 616 NULL, 617 }; 618 619 static const struct attribute_group arm_cmn_cpumask_attr_group = { 620 .attrs = arm_cmn_cpumask_attrs, 621 }; 622 623 static const struct attribute_group *arm_cmn_attr_groups[] = { 624 &arm_cmn_event_attrs_group, 625 &arm_cmn_format_attrs_group, 626 &arm_cmn_cpumask_attr_group, 627 NULL 628 }; 629 630 static int arm_cmn_wp_idx(struct perf_event *event) 631 { 632 return CMN_EVENT_EVENTID(event) + CMN_EVENT_WP_GRP(event); 633 } 634 635 static u32 arm_cmn_wp_config(struct perf_event *event) 636 { 637 u32 config; 638 u32 dev = CMN_EVENT_WP_DEV_SEL(event); 639 u32 chn = CMN_EVENT_WP_CHN_SEL(event); 640 u32 grp = CMN_EVENT_WP_GRP(event); 641 u32 exc = CMN_EVENT_WP_EXCLUSIVE(event); 642 u32 combine = CMN_EVENT_WP_COMBINE(event); 643 644 config = FIELD_PREP(CMN_DTM_WPn_CONFIG_WP_DEV_SEL, dev) | 645 FIELD_PREP(CMN_DTM_WPn_CONFIG_WP_CHN_SEL, chn) | 646 FIELD_PREP(CMN_DTM_WPn_CONFIG_WP_GRP, grp) | 647 FIELD_PREP(CMN_DTM_WPn_CONFIG_WP_EXCLUSIVE, exc); 648 if (combine && !grp) 649 config |= CMN_DTM_WPn_CONFIG_WP_COMBINE; 650 651 return config; 652 } 653 654 static void arm_cmn_set_state(struct arm_cmn *cmn, u32 state) 655 { 656 if (!cmn->state) 657 writel_relaxed(0, cmn->dtc[0].base + CMN_DT_PMCR); 658 cmn->state |= state; 659 } 660 661 static void arm_cmn_clear_state(struct arm_cmn *cmn, u32 state) 662 { 663 cmn->state &= ~state; 664 if (!cmn->state) 665 writel_relaxed(CMN_DT_PMCR_PMU_EN | CMN_DT_PMCR_OVFL_INTR_EN, 666 cmn->dtc[0].base + CMN_DT_PMCR); 667 } 668 669 static void arm_cmn_pmu_enable(struct pmu *pmu) 670 { 671 arm_cmn_clear_state(to_cmn(pmu), CMN_STATE_DISABLED); 672 } 673 674 static void arm_cmn_pmu_disable(struct pmu *pmu) 675 { 676 arm_cmn_set_state(to_cmn(pmu), CMN_STATE_DISABLED); 677 } 678 679 static u64 arm_cmn_read_dtm(struct arm_cmn *cmn, struct arm_cmn_hw_event *hw, 680 bool snapshot) 681 { 682 struct arm_cmn_node *dn; 683 unsigned int i, offset; 684 u64 count = 0; 685 686 offset = snapshot ? CMN_DTM_PMEVCNTSR : CMN_DTM_PMEVCNT; 687 for_each_hw_dn(hw, dn, i) { 688 struct arm_cmn_node *xp = arm_cmn_node_to_xp(dn); 689 int dtm_idx = arm_cmn_get_index(hw->dtm_idx, i); 690 u64 reg = readq_relaxed(xp->pmu_base + offset); 691 u16 dtm_count = reg >> (dtm_idx * 16); 692 693 count += dtm_count; 694 } 695 return count; 696 } 697 698 static u64 arm_cmn_read_cc(struct arm_cmn_dtc *dtc) 699 { 700 u64 val = readq_relaxed(dtc->base + CMN_DT_PMCCNTR); 701 702 writeq_relaxed(CMN_CC_INIT, dtc->base + CMN_DT_PMCCNTR); 703 return (val - CMN_CC_INIT) & ((CMN_CC_INIT << 1) - 1); 704 } 705 706 static u32 arm_cmn_read_counter(struct arm_cmn_dtc *dtc, int idx) 707 { 708 u32 val, pmevcnt = CMN_DT_PMEVCNT(idx); 709 710 val = readl_relaxed(dtc->base + pmevcnt); 711 writel_relaxed(CMN_COUNTER_INIT, dtc->base + pmevcnt); 712 return val - CMN_COUNTER_INIT; 713 } 714 715 static void arm_cmn_init_counter(struct perf_event *event) 716 { 717 struct arm_cmn *cmn = to_cmn(event->pmu); 718 struct arm_cmn_hw_event *hw = to_cmn_hw(event); 719 unsigned int i, pmevcnt = CMN_DT_PMEVCNT(hw->dtc_idx); 720 u64 count; 721 722 for (i = 0; hw->dtcs_used & (1U << i); i++) { 723 writel_relaxed(CMN_COUNTER_INIT, cmn->dtc[i].base + pmevcnt); 724 cmn->dtc[i].counters[hw->dtc_idx] = event; 725 } 726 727 count = arm_cmn_read_dtm(cmn, hw, false); 728 local64_set(&event->hw.prev_count, count); 729 } 730 731 static void arm_cmn_event_read(struct perf_event *event) 732 { 733 struct arm_cmn *cmn = to_cmn(event->pmu); 734 struct arm_cmn_hw_event *hw = to_cmn_hw(event); 735 u64 delta, new, prev; 736 unsigned long flags; 737 unsigned int i; 738 739 if (hw->dtc_idx == CMN_DT_NUM_COUNTERS) { 740 i = __ffs(hw->dtcs_used); 741 delta = arm_cmn_read_cc(cmn->dtc + i); 742 local64_add(delta, &event->count); 743 return; 744 } 745 new = arm_cmn_read_dtm(cmn, hw, false); 746 prev = local64_xchg(&event->hw.prev_count, new); 747 748 delta = new - prev; 749 750 local_irq_save(flags); 751 for (i = 0; hw->dtcs_used & (1U << i); i++) { 752 new = arm_cmn_read_counter(cmn->dtc + i, hw->dtc_idx); 753 delta += new << 16; 754 } 755 local_irq_restore(flags); 756 local64_add(delta, &event->count); 757 } 758 759 static void arm_cmn_event_start(struct perf_event *event, int flags) 760 { 761 struct arm_cmn *cmn = to_cmn(event->pmu); 762 struct arm_cmn_hw_event *hw = to_cmn_hw(event); 763 struct arm_cmn_node *dn; 764 enum cmn_node_type type = CMN_EVENT_TYPE(event); 765 int i; 766 767 if (type == CMN_TYPE_DTC) { 768 i = __ffs(hw->dtcs_used); 769 writeq_relaxed(CMN_CC_INIT, cmn->dtc[i].base + CMN_DT_PMCCNTR); 770 cmn->dtc[i].cc_active = true; 771 } else if (type == CMN_TYPE_WP) { 772 int wp_idx = arm_cmn_wp_idx(event); 773 u64 val = CMN_EVENT_WP_VAL(event); 774 u64 mask = CMN_EVENT_WP_MASK(event); 775 776 for_each_hw_dn(hw, dn, i) { 777 writeq_relaxed(val, dn->pmu_base + CMN_DTM_WPn_VAL(wp_idx)); 778 writeq_relaxed(mask, dn->pmu_base + CMN_DTM_WPn_MASK(wp_idx)); 779 } 780 } else for_each_hw_dn(hw, dn, i) { 781 int dtm_idx = arm_cmn_get_index(hw->dtm_idx, i); 782 783 dn->event[dtm_idx] = CMN_EVENT_EVENTID(event); 784 writel_relaxed(le32_to_cpu(dn->event_sel), dn->pmu_base + CMN_PMU_EVENT_SEL); 785 } 786 } 787 788 static void arm_cmn_event_stop(struct perf_event *event, int flags) 789 { 790 struct arm_cmn *cmn = to_cmn(event->pmu); 791 struct arm_cmn_hw_event *hw = to_cmn_hw(event); 792 struct arm_cmn_node *dn; 793 enum cmn_node_type type = CMN_EVENT_TYPE(event); 794 int i; 795 796 if (type == CMN_TYPE_DTC) { 797 i = __ffs(hw->dtcs_used); 798 cmn->dtc[i].cc_active = false; 799 } else if (type == CMN_TYPE_WP) { 800 int wp_idx = arm_cmn_wp_idx(event); 801 802 for_each_hw_dn(hw, dn, i) { 803 writeq_relaxed(0, dn->pmu_base + CMN_DTM_WPn_MASK(wp_idx)); 804 writeq_relaxed(~0ULL, dn->pmu_base + CMN_DTM_WPn_VAL(wp_idx)); 805 } 806 } else for_each_hw_dn(hw, dn, i) { 807 int dtm_idx = arm_cmn_get_index(hw->dtm_idx, i); 808 809 dn->event[dtm_idx] = 0; 810 writel_relaxed(le32_to_cpu(dn->event_sel), dn->pmu_base + CMN_PMU_EVENT_SEL); 811 } 812 813 arm_cmn_event_read(event); 814 } 815 816 struct arm_cmn_val { 817 u8 dtm_count[CMN_MAX_XPS]; 818 u8 occupid[CMN_MAX_XPS]; 819 u8 wp[CMN_MAX_XPS][4]; 820 int dtc_count; 821 bool cycles; 822 }; 823 824 static void arm_cmn_val_add_event(struct arm_cmn_val *val, struct perf_event *event) 825 { 826 struct arm_cmn_hw_event *hw = to_cmn_hw(event); 827 struct arm_cmn_node *dn; 828 enum cmn_node_type type; 829 int i; 830 u8 occupid; 831 832 if (is_software_event(event)) 833 return; 834 835 type = CMN_EVENT_TYPE(event); 836 if (type == CMN_TYPE_DTC) { 837 val->cycles = true; 838 return; 839 } 840 841 val->dtc_count++; 842 if (arm_cmn_is_occup_event(type, CMN_EVENT_EVENTID(event))) 843 occupid = CMN_EVENT_OCCUPID(event) + 1; 844 else 845 occupid = 0; 846 847 for_each_hw_dn(hw, dn, i) { 848 int wp_idx, xp = arm_cmn_node_to_xp(dn)->logid; 849 850 val->dtm_count[xp]++; 851 val->occupid[xp] = occupid; 852 853 if (type != CMN_TYPE_WP) 854 continue; 855 856 wp_idx = arm_cmn_wp_idx(event); 857 val->wp[xp][wp_idx] = CMN_EVENT_WP_COMBINE(event) + 1; 858 } 859 } 860 861 static int arm_cmn_validate_group(struct perf_event *event) 862 { 863 struct arm_cmn_hw_event *hw = to_cmn_hw(event); 864 struct arm_cmn_node *dn; 865 struct perf_event *sibling, *leader = event->group_leader; 866 enum cmn_node_type type; 867 struct arm_cmn_val val; 868 int i; 869 u8 occupid; 870 871 if (leader == event) 872 return 0; 873 874 if (event->pmu != leader->pmu && !is_software_event(leader)) 875 return -EINVAL; 876 877 memset(&val, 0, sizeof(val)); 878 879 arm_cmn_val_add_event(&val, leader); 880 for_each_sibling_event(sibling, leader) 881 arm_cmn_val_add_event(&val, sibling); 882 883 type = CMN_EVENT_TYPE(event); 884 if (type == CMN_TYPE_DTC) 885 return val.cycles ? -EINVAL : 0; 886 887 if (val.dtc_count == CMN_DT_NUM_COUNTERS) 888 return -EINVAL; 889 890 if (arm_cmn_is_occup_event(type, CMN_EVENT_EVENTID(event))) 891 occupid = CMN_EVENT_OCCUPID(event) + 1; 892 else 893 occupid = 0; 894 895 for_each_hw_dn(hw, dn, i) { 896 int wp_idx, wp_cmb, xp = arm_cmn_node_to_xp(dn)->logid; 897 898 if (val.dtm_count[xp] == CMN_DTM_NUM_COUNTERS) 899 return -EINVAL; 900 901 if (occupid && val.occupid[xp] && occupid != val.occupid[xp]) 902 return -EINVAL; 903 904 if (type != CMN_TYPE_WP) 905 continue; 906 907 wp_idx = arm_cmn_wp_idx(event); 908 if (val.wp[xp][wp_idx]) 909 return -EINVAL; 910 911 wp_cmb = val.wp[xp][wp_idx ^ 1]; 912 if (wp_cmb && wp_cmb != CMN_EVENT_WP_COMBINE(event) + 1) 913 return -EINVAL; 914 } 915 916 return 0; 917 } 918 919 static int arm_cmn_event_init(struct perf_event *event) 920 { 921 struct arm_cmn *cmn = to_cmn(event->pmu); 922 struct arm_cmn_hw_event *hw = to_cmn_hw(event); 923 enum cmn_node_type type; 924 unsigned int i; 925 bool bynodeid; 926 u16 nodeid, eventid; 927 928 if (event->attr.type != event->pmu->type) 929 return -ENOENT; 930 931 if (is_sampling_event(event) || event->attach_state & PERF_ATTACH_TASK) 932 return -EINVAL; 933 934 event->cpu = cmn->cpu; 935 if (event->cpu < 0) 936 return -EINVAL; 937 938 type = CMN_EVENT_TYPE(event); 939 /* DTC events (i.e. cycles) already have everything they need */ 940 if (type == CMN_TYPE_DTC) 941 return 0; 942 943 /* For watchpoints we need the actual XP node here */ 944 if (type == CMN_TYPE_WP) { 945 type = CMN_TYPE_XP; 946 /* ...and we need a "real" direction */ 947 eventid = CMN_EVENT_EVENTID(event); 948 if (eventid != CMN_WP_UP && eventid != CMN_WP_DOWN) 949 return -EINVAL; 950 } 951 952 bynodeid = CMN_EVENT_BYNODEID(event); 953 nodeid = CMN_EVENT_NODEID(event); 954 955 hw->dn = arm_cmn_node(cmn, type); 956 for (i = hw->dn - cmn->dns; i < cmn->num_dns && cmn->dns[i].type == type; i++) { 957 if (!bynodeid) { 958 hw->num_dns++; 959 } else if (cmn->dns[i].id != nodeid) { 960 hw->dn++; 961 } else { 962 hw->num_dns = 1; 963 break; 964 } 965 } 966 967 if (!hw->num_dns) { 968 int bits = arm_cmn_xyidbits(cmn); 969 970 dev_dbg(cmn->dev, "invalid node 0x%x (%d,%d,%d,%d) type 0x%x\n", 971 nodeid, CMN_NODEID_X(nodeid, bits), CMN_NODEID_Y(nodeid, bits), 972 CMN_NODEID_PID(nodeid), CMN_NODEID_DEVID(nodeid), type); 973 return -EINVAL; 974 } 975 /* 976 * By assuming events count in all DTC domains, we cunningly avoid 977 * needing to know anything about how XPs are assigned to domains. 978 */ 979 hw->dtcs_used = (1U << cmn->num_dtcs) - 1; 980 981 return arm_cmn_validate_group(event); 982 } 983 984 static void arm_cmn_event_clear(struct arm_cmn *cmn, struct perf_event *event, 985 int i) 986 { 987 struct arm_cmn_hw_event *hw = to_cmn_hw(event); 988 enum cmn_node_type type = CMN_EVENT_TYPE(event); 989 990 while (i--) { 991 struct arm_cmn_node *xp = arm_cmn_node_to_xp(hw->dn + i); 992 unsigned int dtm_idx = arm_cmn_get_index(hw->dtm_idx, i); 993 994 if (type == CMN_TYPE_WP) 995 hw->dn[i].wp_event[arm_cmn_wp_idx(event)] = -1; 996 997 if (arm_cmn_is_occup_event(type, CMN_EVENT_EVENTID(event))) 998 hw->dn[i].occupid_count--; 999 1000 xp->pmu_config_low &= ~CMN__PMEVCNT_PAIRED(dtm_idx); 1001 writel_relaxed(xp->pmu_config_low, xp->pmu_base + CMN_DTM_PMU_CONFIG); 1002 } 1003 memset(hw->dtm_idx, 0, sizeof(hw->dtm_idx)); 1004 1005 for (i = 0; hw->dtcs_used & (1U << i); i++) 1006 cmn->dtc[i].counters[hw->dtc_idx] = NULL; 1007 } 1008 1009 static int arm_cmn_event_add(struct perf_event *event, int flags) 1010 { 1011 struct arm_cmn *cmn = to_cmn(event->pmu); 1012 struct arm_cmn_hw_event *hw = to_cmn_hw(event); 1013 struct arm_cmn_dtc *dtc = &cmn->dtc[0]; 1014 struct arm_cmn_node *dn; 1015 enum cmn_node_type type = CMN_EVENT_TYPE(event); 1016 unsigned int i, dtc_idx, input_sel; 1017 1018 if (type == CMN_TYPE_DTC) { 1019 i = 0; 1020 while (cmn->dtc[i].cycles) 1021 if (++i == cmn->num_dtcs) 1022 return -ENOSPC; 1023 1024 cmn->dtc[i].cycles = event; 1025 hw->dtc_idx = CMN_DT_NUM_COUNTERS; 1026 hw->dtcs_used = 1U << i; 1027 1028 if (flags & PERF_EF_START) 1029 arm_cmn_event_start(event, 0); 1030 return 0; 1031 } 1032 1033 /* Grab a free global counter first... */ 1034 dtc_idx = 0; 1035 while (dtc->counters[dtc_idx]) 1036 if (++dtc_idx == CMN_DT_NUM_COUNTERS) 1037 return -ENOSPC; 1038 1039 hw->dtc_idx = dtc_idx; 1040 1041 /* ...then the local counters to feed it. */ 1042 for_each_hw_dn(hw, dn, i) { 1043 struct arm_cmn_node *xp = arm_cmn_node_to_xp(dn); 1044 unsigned int dtm_idx, shift; 1045 u64 reg; 1046 1047 dtm_idx = 0; 1048 while (xp->pmu_config_low & CMN__PMEVCNT_PAIRED(dtm_idx)) 1049 if (++dtm_idx == CMN_DTM_NUM_COUNTERS) 1050 goto free_dtms; 1051 1052 if (type == CMN_TYPE_XP) { 1053 input_sel = CMN__PMEVCNT0_INPUT_SEL_XP + dtm_idx; 1054 } else if (type == CMN_TYPE_WP) { 1055 int tmp, wp_idx = arm_cmn_wp_idx(event); 1056 u32 cfg = arm_cmn_wp_config(event); 1057 1058 if (dn->wp_event[wp_idx] >= 0) 1059 goto free_dtms; 1060 1061 tmp = dn->wp_event[wp_idx ^ 1]; 1062 if (tmp >= 0 && CMN_EVENT_WP_COMBINE(event) != 1063 CMN_EVENT_WP_COMBINE(dtc->counters[tmp])) 1064 goto free_dtms; 1065 1066 input_sel = CMN__PMEVCNT0_INPUT_SEL_WP + wp_idx; 1067 dn->wp_event[wp_idx] = dtc_idx; 1068 writel_relaxed(cfg, dn->pmu_base + CMN_DTM_WPn_CONFIG(wp_idx)); 1069 } else { 1070 unsigned int port = CMN_NODEID_PID(dn->id); 1071 unsigned int dev = CMN_NODEID_DEVID(dn->id); 1072 1073 input_sel = CMN__PMEVCNT0_INPUT_SEL_DEV + dtm_idx + 1074 (port << 4) + (dev << 2); 1075 1076 if (arm_cmn_is_occup_event(type, CMN_EVENT_EVENTID(event))) { 1077 int occupid = CMN_EVENT_OCCUPID(event); 1078 1079 if (dn->occupid_count == 0) { 1080 dn->occupid_val = occupid; 1081 writel_relaxed(occupid, 1082 dn->pmu_base + CMN_PMU_EVENT_SEL + 4); 1083 } else if (dn->occupid_val != occupid) { 1084 goto free_dtms; 1085 } 1086 dn->occupid_count++; 1087 } 1088 } 1089 1090 arm_cmn_set_index(hw->dtm_idx, i, dtm_idx); 1091 1092 xp->input_sel[dtm_idx] = input_sel; 1093 shift = CMN__PMEVCNTn_GLOBAL_NUM_SHIFT(dtm_idx); 1094 xp->pmu_config_low &= ~(CMN__PMEVCNT0_GLOBAL_NUM << shift); 1095 xp->pmu_config_low |= FIELD_PREP(CMN__PMEVCNT0_GLOBAL_NUM, dtc_idx) << shift; 1096 xp->pmu_config_low |= CMN__PMEVCNT_PAIRED(dtm_idx); 1097 reg = (u64)le32_to_cpu(xp->pmu_config_high) << 32 | xp->pmu_config_low; 1098 writeq_relaxed(reg, xp->pmu_base + CMN_DTM_PMU_CONFIG); 1099 } 1100 1101 /* Go go go! */ 1102 arm_cmn_init_counter(event); 1103 1104 if (flags & PERF_EF_START) 1105 arm_cmn_event_start(event, 0); 1106 1107 return 0; 1108 1109 free_dtms: 1110 arm_cmn_event_clear(cmn, event, i); 1111 return -ENOSPC; 1112 } 1113 1114 static void arm_cmn_event_del(struct perf_event *event, int flags) 1115 { 1116 struct arm_cmn *cmn = to_cmn(event->pmu); 1117 struct arm_cmn_hw_event *hw = to_cmn_hw(event); 1118 enum cmn_node_type type = CMN_EVENT_TYPE(event); 1119 1120 arm_cmn_event_stop(event, PERF_EF_UPDATE); 1121 1122 if (type == CMN_TYPE_DTC) 1123 cmn->dtc[__ffs(hw->dtcs_used)].cycles = NULL; 1124 else 1125 arm_cmn_event_clear(cmn, event, hw->num_dns); 1126 } 1127 1128 /* 1129 * We stop the PMU for both add and read, to avoid skew across DTM counters. 1130 * In theory we could use snapshots to read without stopping, but then it 1131 * becomes a lot trickier to deal with overlow and racing against interrupts, 1132 * plus it seems they don't work properly on some hardware anyway :( 1133 */ 1134 static void arm_cmn_start_txn(struct pmu *pmu, unsigned int flags) 1135 { 1136 arm_cmn_set_state(to_cmn(pmu), CMN_STATE_TXN); 1137 } 1138 1139 static void arm_cmn_end_txn(struct pmu *pmu) 1140 { 1141 arm_cmn_clear_state(to_cmn(pmu), CMN_STATE_TXN); 1142 } 1143 1144 static int arm_cmn_commit_txn(struct pmu *pmu) 1145 { 1146 arm_cmn_end_txn(pmu); 1147 return 0; 1148 } 1149 1150 static int arm_cmn_pmu_offline_cpu(unsigned int cpu, struct hlist_node *node) 1151 { 1152 struct arm_cmn *cmn; 1153 unsigned int i, target; 1154 1155 cmn = hlist_entry_safe(node, struct arm_cmn, cpuhp_node); 1156 if (cpu != cmn->cpu) 1157 return 0; 1158 1159 target = cpumask_any_but(cpu_online_mask, cpu); 1160 if (target >= nr_cpu_ids) 1161 return 0; 1162 1163 perf_pmu_migrate_context(&cmn->pmu, cpu, target); 1164 for (i = 0; i < cmn->num_dtcs; i++) 1165 irq_set_affinity_hint(cmn->dtc[i].irq, cpumask_of(target)); 1166 cmn->cpu = target; 1167 return 0; 1168 } 1169 1170 static irqreturn_t arm_cmn_handle_irq(int irq, void *dev_id) 1171 { 1172 struct arm_cmn_dtc *dtc = dev_id; 1173 irqreturn_t ret = IRQ_NONE; 1174 1175 for (;;) { 1176 u32 status = readl_relaxed(dtc->base + CMN_DT_PMOVSR); 1177 u64 delta; 1178 int i; 1179 1180 for (i = 0; i < CMN_DTM_NUM_COUNTERS; i++) { 1181 if (status & (1U << i)) { 1182 ret = IRQ_HANDLED; 1183 if (WARN_ON(!dtc->counters[i])) 1184 continue; 1185 delta = (u64)arm_cmn_read_counter(dtc, i) << 16; 1186 local64_add(delta, &dtc->counters[i]->count); 1187 } 1188 } 1189 1190 if (status & (1U << CMN_DT_NUM_COUNTERS)) { 1191 ret = IRQ_HANDLED; 1192 if (dtc->cc_active && !WARN_ON(!dtc->cycles)) { 1193 delta = arm_cmn_read_cc(dtc); 1194 local64_add(delta, &dtc->cycles->count); 1195 } 1196 } 1197 1198 writel_relaxed(status, dtc->base + CMN_DT_PMOVSR_CLR); 1199 1200 if (!dtc->irq_friend) 1201 return ret; 1202 dtc += dtc->irq_friend; 1203 } 1204 } 1205 1206 /* We can reasonably accommodate DTCs of the same CMN sharing IRQs */ 1207 static int arm_cmn_init_irqs(struct arm_cmn *cmn) 1208 { 1209 int i, j, irq, err; 1210 1211 for (i = 0; i < cmn->num_dtcs; i++) { 1212 irq = cmn->dtc[i].irq; 1213 for (j = i; j--; ) { 1214 if (cmn->dtc[j].irq == irq) { 1215 cmn->dtc[j].irq_friend = j - i; 1216 goto next; 1217 } 1218 } 1219 err = devm_request_irq(cmn->dev, irq, arm_cmn_handle_irq, 1220 IRQF_NOBALANCING | IRQF_NO_THREAD, 1221 dev_name(cmn->dev), &cmn->dtc[i]); 1222 if (err) 1223 return err; 1224 1225 err = irq_set_affinity_hint(irq, cpumask_of(cmn->cpu)); 1226 if (err) 1227 return err; 1228 next: 1229 ; /* isn't C great? */ 1230 } 1231 return 0; 1232 } 1233 1234 static void arm_cmn_init_dtm(struct arm_cmn_node *xp) 1235 { 1236 int i; 1237 1238 for (i = 0; i < 4; i++) { 1239 xp->wp_event[i] = -1; 1240 writeq_relaxed(0, xp->pmu_base + CMN_DTM_WPn_MASK(i)); 1241 writeq_relaxed(~0ULL, xp->pmu_base + CMN_DTM_WPn_VAL(i)); 1242 } 1243 xp->pmu_config_low = CMN_DTM_PMU_CONFIG_PMU_EN; 1244 xp->dtc = -1; 1245 } 1246 1247 static int arm_cmn_init_dtc(struct arm_cmn *cmn, struct arm_cmn_node *dn, int idx) 1248 { 1249 struct arm_cmn_dtc *dtc = cmn->dtc + idx; 1250 struct arm_cmn_node *xp; 1251 1252 dtc->base = dn->pmu_base - CMN_PMU_OFFSET; 1253 dtc->irq = platform_get_irq(to_platform_device(cmn->dev), idx); 1254 if (dtc->irq < 0) 1255 return dtc->irq; 1256 1257 writel_relaxed(0, dtc->base + CMN_DT_PMCR); 1258 writel_relaxed(0x1ff, dtc->base + CMN_DT_PMOVSR_CLR); 1259 writel_relaxed(CMN_DT_PMCR_OVFL_INTR_EN, dtc->base + CMN_DT_PMCR); 1260 1261 /* We do at least know that a DTC's XP must be in that DTC's domain */ 1262 xp = arm_cmn_node_to_xp(dn); 1263 xp->dtc = idx; 1264 1265 return 0; 1266 } 1267 1268 static int arm_cmn_node_cmp(const void *a, const void *b) 1269 { 1270 const struct arm_cmn_node *dna = a, *dnb = b; 1271 int cmp; 1272 1273 cmp = dna->type - dnb->type; 1274 if (!cmp) 1275 cmp = dna->logid - dnb->logid; 1276 return cmp; 1277 } 1278 1279 static int arm_cmn_init_dtcs(struct arm_cmn *cmn) 1280 { 1281 struct arm_cmn_node *dn; 1282 int dtc_idx = 0; 1283 1284 cmn->dtc = devm_kcalloc(cmn->dev, cmn->num_dtcs, sizeof(cmn->dtc[0]), GFP_KERNEL); 1285 if (!cmn->dtc) 1286 return -ENOMEM; 1287 1288 sort(cmn->dns, cmn->num_dns, sizeof(cmn->dns[0]), arm_cmn_node_cmp, NULL); 1289 1290 cmn->xps = arm_cmn_node(cmn, CMN_TYPE_XP); 1291 1292 for (dn = cmn->dns; dn < cmn->dns + cmn->num_dns; dn++) { 1293 if (dn->type != CMN_TYPE_XP) 1294 arm_cmn_init_node_to_xp(cmn, dn); 1295 else if (cmn->num_dtcs == 1) 1296 dn->dtc = 0; 1297 1298 if (dn->type == CMN_TYPE_DTC) 1299 arm_cmn_init_dtc(cmn, dn, dtc_idx++); 1300 1301 /* To the PMU, RN-Ds don't add anything over RN-Is, so smoosh them together */ 1302 if (dn->type == CMN_TYPE_RND) 1303 dn->type = CMN_TYPE_RNI; 1304 } 1305 1306 writel_relaxed(CMN_DT_DTC_CTL_DT_EN, cmn->dtc[0].base + CMN_DT_DTC_CTL); 1307 1308 return 0; 1309 } 1310 1311 static void arm_cmn_init_node_info(struct arm_cmn *cmn, u32 offset, struct arm_cmn_node *node) 1312 { 1313 int level; 1314 u64 reg = readq_relaxed(cmn->base + offset + CMN_NODE_INFO); 1315 1316 node->type = FIELD_GET(CMN_NI_NODE_TYPE, reg); 1317 node->id = FIELD_GET(CMN_NI_NODE_ID, reg); 1318 node->logid = FIELD_GET(CMN_NI_LOGICAL_ID, reg); 1319 1320 node->pmu_base = cmn->base + offset + CMN_PMU_OFFSET; 1321 1322 if (node->type == CMN_TYPE_CFG) 1323 level = 0; 1324 else if (node->type == CMN_TYPE_XP) 1325 level = 1; 1326 else 1327 level = 2; 1328 1329 dev_dbg(cmn->dev, "node%*c%#06hx%*ctype:%-#6x id:%-4hd off:%#x\n", 1330 (level * 2) + 1, ' ', node->id, 5 - (level * 2), ' ', 1331 node->type, node->logid, offset); 1332 } 1333 1334 static int arm_cmn_discover(struct arm_cmn *cmn, unsigned int rgn_offset) 1335 { 1336 void __iomem *cfg_region; 1337 struct arm_cmn_node cfg, *dn; 1338 u16 child_count, child_poff; 1339 u32 xp_offset[CMN_MAX_XPS]; 1340 u64 reg; 1341 int i, j; 1342 1343 cfg_region = cmn->base + rgn_offset; 1344 reg = readl_relaxed(cfg_region + CMN_CFGM_PERIPH_ID_2); 1345 cmn->rev = FIELD_GET(CMN_CFGM_PID2_REVISION, reg); 1346 dev_dbg(cmn->dev, "periph_id_2 revision: %d\n", cmn->rev); 1347 1348 arm_cmn_init_node_info(cmn, rgn_offset, &cfg); 1349 if (cfg.type != CMN_TYPE_CFG) 1350 return -ENODEV; 1351 1352 reg = readq_relaxed(cfg_region + CMN_CHILD_INFO); 1353 child_count = FIELD_GET(CMN_CI_CHILD_COUNT, reg); 1354 child_poff = FIELD_GET(CMN_CI_CHILD_PTR_OFFSET, reg); 1355 1356 cmn->num_xps = child_count; 1357 cmn->num_dns = cmn->num_xps; 1358 1359 /* Pass 1: visit the XPs, enumerate their children */ 1360 for (i = 0; i < cmn->num_xps; i++) { 1361 reg = readq_relaxed(cfg_region + child_poff + i * 8); 1362 xp_offset[i] = reg & CMN_CHILD_NODE_ADDR; 1363 1364 reg = readq_relaxed(cmn->base + xp_offset[i] + CMN_CHILD_INFO); 1365 cmn->num_dns += FIELD_GET(CMN_CI_CHILD_COUNT, reg); 1366 } 1367 1368 /* Cheeky +1 to help terminate pointer-based iteration */ 1369 cmn->dns = devm_kcalloc(cmn->dev, cmn->num_dns + 1, 1370 sizeof(*cmn->dns), GFP_KERNEL); 1371 if (!cmn->dns) 1372 return -ENOMEM; 1373 1374 /* Pass 2: now we can actually populate the nodes */ 1375 dn = cmn->dns; 1376 for (i = 0; i < cmn->num_xps; i++) { 1377 void __iomem *xp_region = cmn->base + xp_offset[i]; 1378 struct arm_cmn_node *xp = dn++; 1379 1380 arm_cmn_init_node_info(cmn, xp_offset[i], xp); 1381 arm_cmn_init_dtm(xp); 1382 /* 1383 * Thanks to the order in which XP logical IDs seem to be 1384 * assigned, we can handily infer the mesh X dimension by 1385 * looking out for the XP at (0,1) without needing to know 1386 * the exact node ID format, which we can later derive. 1387 */ 1388 if (xp->id == (1 << 3)) 1389 cmn->mesh_x = xp->logid; 1390 1391 reg = readq_relaxed(xp_region + CMN_CHILD_INFO); 1392 child_count = FIELD_GET(CMN_CI_CHILD_COUNT, reg); 1393 child_poff = FIELD_GET(CMN_CI_CHILD_PTR_OFFSET, reg); 1394 1395 for (j = 0; j < child_count; j++) { 1396 reg = readq_relaxed(xp_region + child_poff + j * 8); 1397 /* 1398 * Don't even try to touch anything external, since in general 1399 * we haven't a clue how to power up arbitrary CHI requesters. 1400 * As of CMN-600r1 these could only be RN-SAMs or CXLAs, 1401 * neither of which have any PMU events anyway. 1402 * (Actually, CXLAs do seem to have grown some events in r1p2, 1403 * but they don't go to regular XP DTMs, and they depend on 1404 * secure configuration which we can't easily deal with) 1405 */ 1406 if (reg & CMN_CHILD_NODE_EXTERNAL) { 1407 dev_dbg(cmn->dev, "ignoring external node %llx\n", reg); 1408 continue; 1409 } 1410 1411 arm_cmn_init_node_info(cmn, reg & CMN_CHILD_NODE_ADDR, dn); 1412 1413 switch (dn->type) { 1414 case CMN_TYPE_DTC: 1415 cmn->num_dtcs++; 1416 dn++; 1417 break; 1418 /* These guys have PMU events */ 1419 case CMN_TYPE_DVM: 1420 case CMN_TYPE_HNI: 1421 case CMN_TYPE_HNF: 1422 case CMN_TYPE_SBSX: 1423 case CMN_TYPE_RNI: 1424 case CMN_TYPE_RND: 1425 case CMN_TYPE_CXRA: 1426 case CMN_TYPE_CXHA: 1427 dn++; 1428 break; 1429 /* Nothing to see here */ 1430 case CMN_TYPE_RNSAM: 1431 case CMN_TYPE_CXLA: 1432 break; 1433 /* Something has gone horribly wrong */ 1434 default: 1435 dev_err(cmn->dev, "invalid device node type: 0x%x\n", dn->type); 1436 return -ENODEV; 1437 } 1438 } 1439 } 1440 1441 /* Correct for any nodes we skipped */ 1442 cmn->num_dns = dn - cmn->dns; 1443 1444 /* 1445 * If mesh_x wasn't set during discovery then we never saw 1446 * an XP at (0,1), thus we must have an Nx1 configuration. 1447 */ 1448 if (!cmn->mesh_x) 1449 cmn->mesh_x = cmn->num_xps; 1450 cmn->mesh_y = cmn->num_xps / cmn->mesh_x; 1451 1452 dev_dbg(cmn->dev, "mesh %dx%d, ID width %d\n", 1453 cmn->mesh_x, cmn->mesh_y, arm_cmn_xyidbits(cmn)); 1454 1455 return 0; 1456 } 1457 1458 static int arm_cmn_acpi_probe(struct platform_device *pdev, struct arm_cmn *cmn) 1459 { 1460 struct resource *cfg, *root; 1461 1462 cfg = platform_get_resource(pdev, IORESOURCE_MEM, 0); 1463 if (!cfg) 1464 return -EINVAL; 1465 1466 root = platform_get_resource(pdev, IORESOURCE_MEM, 1); 1467 if (!root) 1468 return -EINVAL; 1469 1470 if (!resource_contains(cfg, root)) 1471 swap(cfg, root); 1472 /* 1473 * Note that devm_ioremap_resource() is dumb and won't let the platform 1474 * device claim cfg when the ACPI companion device has already claimed 1475 * root within it. But since they *are* already both claimed in the 1476 * appropriate name, we don't really need to do it again here anyway. 1477 */ 1478 cmn->base = devm_ioremap(cmn->dev, cfg->start, resource_size(cfg)); 1479 if (!cmn->base) 1480 return -ENOMEM; 1481 1482 return root->start - cfg->start; 1483 } 1484 1485 static int arm_cmn_of_probe(struct platform_device *pdev, struct arm_cmn *cmn) 1486 { 1487 struct device_node *np = pdev->dev.of_node; 1488 u32 rootnode; 1489 int ret; 1490 1491 cmn->base = devm_platform_ioremap_resource(pdev, 0); 1492 if (IS_ERR(cmn->base)) 1493 return PTR_ERR(cmn->base); 1494 1495 ret = of_property_read_u32(np, "arm,root-node", &rootnode); 1496 if (ret) 1497 return ret; 1498 1499 return rootnode; 1500 } 1501 1502 static int arm_cmn_probe(struct platform_device *pdev) 1503 { 1504 struct arm_cmn *cmn; 1505 const char *name; 1506 static atomic_t id; 1507 int err, rootnode; 1508 1509 cmn = devm_kzalloc(&pdev->dev, sizeof(*cmn), GFP_KERNEL); 1510 if (!cmn) 1511 return -ENOMEM; 1512 1513 cmn->dev = &pdev->dev; 1514 platform_set_drvdata(pdev, cmn); 1515 1516 if (has_acpi_companion(cmn->dev)) 1517 rootnode = arm_cmn_acpi_probe(pdev, cmn); 1518 else 1519 rootnode = arm_cmn_of_probe(pdev, cmn); 1520 if (rootnode < 0) 1521 return rootnode; 1522 1523 err = arm_cmn_discover(cmn, rootnode); 1524 if (err) 1525 return err; 1526 1527 err = arm_cmn_init_dtcs(cmn); 1528 if (err) 1529 return err; 1530 1531 err = arm_cmn_init_irqs(cmn); 1532 if (err) 1533 return err; 1534 1535 cmn->cpu = raw_smp_processor_id(); 1536 cmn->pmu = (struct pmu) { 1537 .module = THIS_MODULE, 1538 .attr_groups = arm_cmn_attr_groups, 1539 .capabilities = PERF_PMU_CAP_NO_EXCLUDE, 1540 .task_ctx_nr = perf_invalid_context, 1541 .pmu_enable = arm_cmn_pmu_enable, 1542 .pmu_disable = arm_cmn_pmu_disable, 1543 .event_init = arm_cmn_event_init, 1544 .add = arm_cmn_event_add, 1545 .del = arm_cmn_event_del, 1546 .start = arm_cmn_event_start, 1547 .stop = arm_cmn_event_stop, 1548 .read = arm_cmn_event_read, 1549 .start_txn = arm_cmn_start_txn, 1550 .commit_txn = arm_cmn_commit_txn, 1551 .cancel_txn = arm_cmn_end_txn, 1552 }; 1553 1554 name = devm_kasprintf(cmn->dev, GFP_KERNEL, "arm_cmn_%d", atomic_fetch_inc(&id)); 1555 if (!name) 1556 return -ENOMEM; 1557 1558 err = cpuhp_state_add_instance(arm_cmn_hp_state, &cmn->cpuhp_node); 1559 if (err) 1560 return err; 1561 1562 err = perf_pmu_register(&cmn->pmu, name, -1); 1563 if (err) 1564 cpuhp_state_remove_instance(arm_cmn_hp_state, &cmn->cpuhp_node); 1565 return err; 1566 } 1567 1568 static int arm_cmn_remove(struct platform_device *pdev) 1569 { 1570 struct arm_cmn *cmn = platform_get_drvdata(pdev); 1571 int i; 1572 1573 writel_relaxed(0, cmn->dtc[0].base + CMN_DT_DTC_CTL); 1574 1575 perf_pmu_unregister(&cmn->pmu); 1576 cpuhp_state_remove_instance(arm_cmn_hp_state, &cmn->cpuhp_node); 1577 1578 for (i = 0; i < cmn->num_dtcs; i++) 1579 irq_set_affinity_hint(cmn->dtc[i].irq, NULL); 1580 1581 return 0; 1582 } 1583 1584 #ifdef CONFIG_OF 1585 static const struct of_device_id arm_cmn_of_match[] = { 1586 { .compatible = "arm,cmn-600", }, 1587 {} 1588 }; 1589 MODULE_DEVICE_TABLE(of, arm_cmn_of_match); 1590 #endif 1591 1592 #ifdef CONFIG_ACPI 1593 static const struct acpi_device_id arm_cmn_acpi_match[] = { 1594 { "ARMHC600", }, 1595 {} 1596 }; 1597 MODULE_DEVICE_TABLE(acpi, arm_cmn_acpi_match); 1598 #endif 1599 1600 static struct platform_driver arm_cmn_driver = { 1601 .driver = { 1602 .name = "arm-cmn", 1603 .of_match_table = of_match_ptr(arm_cmn_of_match), 1604 .acpi_match_table = ACPI_PTR(arm_cmn_acpi_match), 1605 }, 1606 .probe = arm_cmn_probe, 1607 .remove = arm_cmn_remove, 1608 }; 1609 1610 static int __init arm_cmn_init(void) 1611 { 1612 int ret; 1613 1614 ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, 1615 "perf/arm/cmn:online", NULL, 1616 arm_cmn_pmu_offline_cpu); 1617 if (ret < 0) 1618 return ret; 1619 1620 arm_cmn_hp_state = ret; 1621 ret = platform_driver_register(&arm_cmn_driver); 1622 if (ret) 1623 cpuhp_remove_multi_state(arm_cmn_hp_state); 1624 return ret; 1625 } 1626 1627 static void __exit arm_cmn_exit(void) 1628 { 1629 platform_driver_unregister(&arm_cmn_driver); 1630 cpuhp_remove_multi_state(arm_cmn_hp_state); 1631 } 1632 1633 module_init(arm_cmn_init); 1634 module_exit(arm_cmn_exit); 1635 1636 MODULE_AUTHOR("Robin Murphy <robin.murphy@arm.com>"); 1637 MODULE_DESCRIPTION("Arm CMN-600 PMU driver"); 1638 MODULE_LICENSE("GPL v2"); 1639