1 // SPDX-License-Identifier: GPL-2.0 2 // Copyright 2023 NXP 3 4 #include <linux/bitfield.h> 5 #include <linux/init.h> 6 #include <linux/interrupt.h> 7 #include <linux/io.h> 8 #include <linux/module.h> 9 #include <linux/of.h> 10 #include <linux/platform_device.h> 11 #include <linux/perf_event.h> 12 13 /* Performance monitor configuration */ 14 #define PMCFG1 0x00 15 #define MX93_PMCFG1_RD_TRANS_FILT_EN BIT(31) 16 #define MX93_PMCFG1_WR_TRANS_FILT_EN BIT(30) 17 #define MX93_PMCFG1_RD_BT_FILT_EN BIT(29) 18 #define MX93_PMCFG1_ID_MASK GENMASK(17, 0) 19 20 #define MX95_PMCFG1_WR_BEAT_FILT_EN BIT(31) 21 #define MX95_PMCFG1_RD_BEAT_FILT_EN BIT(30) 22 23 #define PMCFG2 0x04 24 #define MX93_PMCFG2_ID GENMASK(17, 0) 25 26 #define PMCFG3 0x08 27 #define PMCFG4 0x0C 28 #define PMCFG5 0x10 29 #define PMCFG6 0x14 30 #define MX95_PMCFG_ID_MASK GENMASK(9, 0) 31 #define MX95_PMCFG_ID GENMASK(25, 16) 32 33 /* Global control register affects all counters and takes priority over local control registers */ 34 #define PMGC0 0x40 35 /* Global control register bits */ 36 #define PMGC0_FAC BIT(31) 37 #define PMGC0_PMIE BIT(30) 38 #define PMGC0_FCECE BIT(29) 39 40 /* 41 * 64bit counter0 exclusively dedicated to counting cycles 42 * 32bit counters monitor counter-specific events in addition to counting reference events 43 */ 44 #define PMLCA(n) (0x40 + 0x10 + (0x10 * n)) 45 #define PMLCB(n) (0x40 + 0x14 + (0x10 * n)) 46 #define PMC(n) (0x40 + 0x18 + (0x10 * n)) 47 /* Local control register bits */ 48 #define PMLCA_FC BIT(31) 49 #define PMLCA_CE BIT(26) 50 #define PMLCA_EVENT GENMASK(22, 16) 51 52 #define NUM_COUNTERS 11 53 #define CYCLES_COUNTER 0 54 #define CYCLES_EVENT_ID 0 55 56 #define CONFIG_EVENT_MASK GENMASK(7, 0) 57 #define CONFIG_COUNTER_MASK GENMASK(23, 16) 58 59 #define to_ddr_pmu(p) container_of(p, struct ddr_pmu, pmu) 60 61 #define DDR_PERF_DEV_NAME "imx9_ddr" 62 #define DDR_CPUHP_CB_NAME DDR_PERF_DEV_NAME "_perf_pmu" 63 64 static DEFINE_IDA(ddr_ida); 65 66 /* 67 * V1 support 1 read transaction, 1 write transaction and 1 read beats 68 * event which corresponding respecitively to counter 2, 3 and 4. 69 */ 70 #define DDR_PERF_AXI_FILTER_V1 0x1 71 72 /* 73 * V2 support 1 read beats and 3 write beats events which corresponding 74 * respecitively to counter 2-5. 75 */ 76 #define DDR_PERF_AXI_FILTER_V2 0x2 77 78 struct imx_ddr_devtype_data { 79 const char *identifier; /* system PMU identifier for userspace */ 80 unsigned int filter_ver; /* AXI filter version */ 81 }; 82 83 struct ddr_pmu { 84 struct pmu pmu; 85 void __iomem *base; 86 unsigned int cpu; 87 struct hlist_node node; 88 struct device *dev; 89 struct perf_event *events[NUM_COUNTERS]; 90 int active_events; 91 enum cpuhp_state cpuhp_state; 92 const struct imx_ddr_devtype_data *devtype_data; 93 int irq; 94 int id; 95 }; 96 97 static const struct imx_ddr_devtype_data imx91_devtype_data = { 98 .identifier = "imx91", 99 .filter_ver = DDR_PERF_AXI_FILTER_V1 100 }; 101 102 static const struct imx_ddr_devtype_data imx93_devtype_data = { 103 .identifier = "imx93", 104 .filter_ver = DDR_PERF_AXI_FILTER_V1 105 }; 106 107 static const struct imx_ddr_devtype_data imx95_devtype_data = { 108 .identifier = "imx95", 109 .filter_ver = DDR_PERF_AXI_FILTER_V2 110 }; 111 112 static inline bool axi_filter_v1(struct ddr_pmu *pmu) 113 { 114 return pmu->devtype_data->filter_ver == DDR_PERF_AXI_FILTER_V1; 115 } 116 117 static inline bool axi_filter_v2(struct ddr_pmu *pmu) 118 { 119 return pmu->devtype_data->filter_ver == DDR_PERF_AXI_FILTER_V2; 120 } 121 122 static const struct of_device_id imx_ddr_pmu_dt_ids[] = { 123 { .compatible = "fsl,imx91-ddr-pmu", .data = &imx91_devtype_data }, 124 { .compatible = "fsl,imx93-ddr-pmu", .data = &imx93_devtype_data }, 125 { .compatible = "fsl,imx95-ddr-pmu", .data = &imx95_devtype_data }, 126 { /* sentinel */ } 127 }; 128 MODULE_DEVICE_TABLE(of, imx_ddr_pmu_dt_ids); 129 130 static ssize_t ddr_perf_identifier_show(struct device *dev, 131 struct device_attribute *attr, 132 char *page) 133 { 134 struct ddr_pmu *pmu = dev_get_drvdata(dev); 135 136 return sysfs_emit(page, "%s\n", pmu->devtype_data->identifier); 137 } 138 139 static struct device_attribute ddr_perf_identifier_attr = 140 __ATTR(identifier, 0444, ddr_perf_identifier_show, NULL); 141 142 static struct attribute *ddr_perf_identifier_attrs[] = { 143 &ddr_perf_identifier_attr.attr, 144 NULL, 145 }; 146 147 static struct attribute_group ddr_perf_identifier_attr_group = { 148 .attrs = ddr_perf_identifier_attrs, 149 }; 150 151 static ssize_t ddr_perf_cpumask_show(struct device *dev, 152 struct device_attribute *attr, char *buf) 153 { 154 struct ddr_pmu *pmu = dev_get_drvdata(dev); 155 156 return cpumap_print_to_pagebuf(true, buf, cpumask_of(pmu->cpu)); 157 } 158 159 static struct device_attribute ddr_perf_cpumask_attr = 160 __ATTR(cpumask, 0444, ddr_perf_cpumask_show, NULL); 161 162 static struct attribute *ddr_perf_cpumask_attrs[] = { 163 &ddr_perf_cpumask_attr.attr, 164 NULL, 165 }; 166 167 static const struct attribute_group ddr_perf_cpumask_attr_group = { 168 .attrs = ddr_perf_cpumask_attrs, 169 }; 170 171 struct imx9_pmu_events_attr { 172 struct device_attribute attr; 173 u64 id; 174 const struct imx_ddr_devtype_data *devtype_data; 175 }; 176 177 static ssize_t ddr_pmu_event_show(struct device *dev, 178 struct device_attribute *attr, char *page) 179 { 180 struct imx9_pmu_events_attr *pmu_attr; 181 182 pmu_attr = container_of(attr, struct imx9_pmu_events_attr, attr); 183 return sysfs_emit(page, "event=0x%02llx\n", pmu_attr->id); 184 } 185 186 #define COUNTER_OFFSET_IN_EVENT 8 187 #define ID(counter, id) ((counter << COUNTER_OFFSET_IN_EVENT) | id) 188 189 #define DDR_PMU_EVENT_ATTR_COMM(_name, _id, _data) \ 190 (&((struct imx9_pmu_events_attr[]) { \ 191 { .attr = __ATTR(_name, 0444, ddr_pmu_event_show, NULL),\ 192 .id = _id, \ 193 .devtype_data = _data, } \ 194 })[0].attr.attr) 195 196 #define IMX9_DDR_PMU_EVENT_ATTR(_name, _id) \ 197 DDR_PMU_EVENT_ATTR_COMM(_name, _id, NULL) 198 199 #define IMX93_DDR_PMU_EVENT_ATTR(_name, _id) \ 200 DDR_PMU_EVENT_ATTR_COMM(_name, _id, &imx93_devtype_data) 201 202 #define IMX95_DDR_PMU_EVENT_ATTR(_name, _id) \ 203 DDR_PMU_EVENT_ATTR_COMM(_name, _id, &imx95_devtype_data) 204 205 static struct attribute *ddr_perf_events_attrs[] = { 206 /* counter0 cycles event */ 207 IMX9_DDR_PMU_EVENT_ATTR(cycles, 0), 208 209 /* reference events for all normal counters, need assert DEBUG19[21] bit */ 210 IMX9_DDR_PMU_EVENT_ATTR(ddrc_ddrc1_rmw_for_ecc, 12), 211 IMX9_DDR_PMU_EVENT_ATTR(eddrtq_pmon_rreorder, 13), 212 IMX9_DDR_PMU_EVENT_ATTR(eddrtq_pmon_wreorder, 14), 213 IMX9_DDR_PMU_EVENT_ATTR(ddrc_pm_0, 15), 214 IMX9_DDR_PMU_EVENT_ATTR(ddrc_pm_1, 16), 215 IMX9_DDR_PMU_EVENT_ATTR(ddrc_pm_2, 17), 216 IMX9_DDR_PMU_EVENT_ATTR(ddrc_pm_3, 18), 217 IMX9_DDR_PMU_EVENT_ATTR(ddrc_pm_4, 19), 218 IMX9_DDR_PMU_EVENT_ATTR(ddrc_pm_5, 22), 219 IMX9_DDR_PMU_EVENT_ATTR(ddrc_pm_6, 23), 220 IMX9_DDR_PMU_EVENT_ATTR(ddrc_pm_7, 24), 221 IMX9_DDR_PMU_EVENT_ATTR(ddrc_pm_8, 25), 222 IMX9_DDR_PMU_EVENT_ATTR(ddrc_pm_9, 26), 223 IMX9_DDR_PMU_EVENT_ATTR(ddrc_pm_10, 27), 224 IMX9_DDR_PMU_EVENT_ATTR(ddrc_pm_11, 28), 225 IMX9_DDR_PMU_EVENT_ATTR(ddrc_pm_12, 31), 226 IMX9_DDR_PMU_EVENT_ATTR(ddrc_pm_13, 59), 227 IMX9_DDR_PMU_EVENT_ATTR(ddrc_pm_15, 61), 228 IMX9_DDR_PMU_EVENT_ATTR(ddrc_pm_29, 63), 229 230 /* counter1 specific events */ 231 IMX9_DDR_PMU_EVENT_ATTR(ddrc_ld_riq_0, ID(1, 64)), 232 IMX9_DDR_PMU_EVENT_ATTR(ddrc_ld_riq_1, ID(1, 65)), 233 IMX9_DDR_PMU_EVENT_ATTR(ddrc_ld_riq_2, ID(1, 66)), 234 IMX9_DDR_PMU_EVENT_ATTR(ddrc_ld_riq_3, ID(1, 67)), 235 IMX9_DDR_PMU_EVENT_ATTR(ddrc_ld_riq_4, ID(1, 68)), 236 IMX9_DDR_PMU_EVENT_ATTR(ddrc_ld_riq_5, ID(1, 69)), 237 IMX9_DDR_PMU_EVENT_ATTR(ddrc_ld_riq_6, ID(1, 70)), 238 IMX9_DDR_PMU_EVENT_ATTR(ddrc_ld_riq_7, ID(1, 71)), 239 240 /* counter2 specific events */ 241 IMX9_DDR_PMU_EVENT_ATTR(ddrc_ld_wiq_0, ID(2, 64)), 242 IMX9_DDR_PMU_EVENT_ATTR(ddrc_ld_wiq_1, ID(2, 65)), 243 IMX9_DDR_PMU_EVENT_ATTR(ddrc_ld_wiq_2, ID(2, 66)), 244 IMX9_DDR_PMU_EVENT_ATTR(ddrc_ld_wiq_3, ID(2, 67)), 245 IMX9_DDR_PMU_EVENT_ATTR(ddrc_ld_wiq_4, ID(2, 68)), 246 IMX9_DDR_PMU_EVENT_ATTR(ddrc_ld_wiq_5, ID(2, 69)), 247 IMX9_DDR_PMU_EVENT_ATTR(ddrc_ld_wiq_6, ID(2, 70)), 248 IMX9_DDR_PMU_EVENT_ATTR(ddrc_ld_wiq_7, ID(2, 71)), 249 IMX9_DDR_PMU_EVENT_ATTR(eddrtq_pmon_empty, ID(2, 72)), 250 IMX93_DDR_PMU_EVENT_ATTR(eddrtq_pm_rd_trans_filt, ID(2, 73)), /* imx93 specific*/ 251 IMX95_DDR_PMU_EVENT_ATTR(eddrtq_pm_wr_beat_filt, ID(2, 73)), /* imx95 specific*/ 252 253 /* counter3 specific events */ 254 IMX9_DDR_PMU_EVENT_ATTR(ddrc_qx_row_collision_0, ID(3, 64)), 255 IMX9_DDR_PMU_EVENT_ATTR(ddrc_qx_row_collision_1, ID(3, 65)), 256 IMX9_DDR_PMU_EVENT_ATTR(ddrc_qx_row_collision_2, ID(3, 66)), 257 IMX9_DDR_PMU_EVENT_ATTR(ddrc_qx_row_collision_3, ID(3, 67)), 258 IMX9_DDR_PMU_EVENT_ATTR(ddrc_qx_row_collision_4, ID(3, 68)), 259 IMX9_DDR_PMU_EVENT_ATTR(ddrc_qx_row_collision_5, ID(3, 69)), 260 IMX9_DDR_PMU_EVENT_ATTR(ddrc_qx_row_collision_6, ID(3, 70)), 261 IMX9_DDR_PMU_EVENT_ATTR(ddrc_qx_row_collision_7, ID(3, 71)), 262 IMX9_DDR_PMU_EVENT_ATTR(eddrtq_pmon_full, ID(3, 72)), 263 IMX93_DDR_PMU_EVENT_ATTR(eddrtq_pm_wr_trans_filt, ID(3, 73)), /* imx93 specific*/ 264 IMX95_DDR_PMU_EVENT_ATTR(eddrtq_pm_rd_beat_filt2, ID(3, 73)), /* imx95 specific*/ 265 266 /* counter4 specific events */ 267 IMX9_DDR_PMU_EVENT_ATTR(ddrc_qx_row_open_0, ID(4, 64)), 268 IMX9_DDR_PMU_EVENT_ATTR(ddrc_qx_row_open_1, ID(4, 65)), 269 IMX9_DDR_PMU_EVENT_ATTR(ddrc_qx_row_open_2, ID(4, 66)), 270 IMX9_DDR_PMU_EVENT_ATTR(ddrc_qx_row_open_3, ID(4, 67)), 271 IMX9_DDR_PMU_EVENT_ATTR(ddrc_qx_row_open_4, ID(4, 68)), 272 IMX9_DDR_PMU_EVENT_ATTR(ddrc_qx_row_open_5, ID(4, 69)), 273 IMX9_DDR_PMU_EVENT_ATTR(ddrc_qx_row_open_6, ID(4, 70)), 274 IMX9_DDR_PMU_EVENT_ATTR(ddrc_qx_row_open_7, ID(4, 71)), 275 IMX9_DDR_PMU_EVENT_ATTR(eddrtq_pmon_ld_rdq2_rmw, ID(4, 72)), 276 IMX93_DDR_PMU_EVENT_ATTR(eddrtq_pm_rd_beat_filt, ID(4, 73)), /* imx93 specific*/ 277 IMX95_DDR_PMU_EVENT_ATTR(eddrtq_pm_rd_beat_filt1, ID(4, 73)), /* imx95 specific*/ 278 279 /* counter5 specific events */ 280 IMX9_DDR_PMU_EVENT_ATTR(ddrc_qx_valid_start_0, ID(5, 64)), 281 IMX9_DDR_PMU_EVENT_ATTR(ddrc_qx_valid_start_1, ID(5, 65)), 282 IMX9_DDR_PMU_EVENT_ATTR(ddrc_qx_valid_start_2, ID(5, 66)), 283 IMX9_DDR_PMU_EVENT_ATTR(ddrc_qx_valid_start_3, ID(5, 67)), 284 IMX9_DDR_PMU_EVENT_ATTR(ddrc_qx_valid_start_4, ID(5, 68)), 285 IMX9_DDR_PMU_EVENT_ATTR(ddrc_qx_valid_start_5, ID(5, 69)), 286 IMX9_DDR_PMU_EVENT_ATTR(ddrc_qx_valid_start_6, ID(5, 70)), 287 IMX9_DDR_PMU_EVENT_ATTR(ddrc_qx_valid_start_7, ID(5, 71)), 288 IMX9_DDR_PMU_EVENT_ATTR(eddrtq_pmon_ld_rdq1, ID(5, 72)), 289 IMX95_DDR_PMU_EVENT_ATTR(eddrtq_pm_rd_beat_filt0, ID(5, 73)), /* imx95 specific*/ 290 291 /* counter6 specific events */ 292 IMX9_DDR_PMU_EVENT_ATTR(ddrc_qx_valid_end_0, ID(6, 64)), 293 IMX9_DDR_PMU_EVENT_ATTR(eddrtq_pmon_ld_rdq2, ID(6, 72)), 294 295 /* counter7 specific events */ 296 IMX9_DDR_PMU_EVENT_ATTR(eddrtq_pmon_1_2_full, ID(7, 64)), 297 IMX9_DDR_PMU_EVENT_ATTR(eddrtq_pmon_ld_wrq0, ID(7, 65)), 298 299 /* counter8 specific events */ 300 IMX9_DDR_PMU_EVENT_ATTR(eddrtq_pmon_bias_switched, ID(8, 64)), 301 IMX9_DDR_PMU_EVENT_ATTR(eddrtq_pmon_1_4_full, ID(8, 65)), 302 303 /* counter9 specific events */ 304 IMX9_DDR_PMU_EVENT_ATTR(eddrtq_pmon_ld_wrq1, ID(9, 65)), 305 IMX9_DDR_PMU_EVENT_ATTR(eddrtq_pmon_3_4_full, ID(9, 66)), 306 307 /* counter10 specific events */ 308 IMX9_DDR_PMU_EVENT_ATTR(eddrtq_pmon_misc_mrk, ID(10, 65)), 309 IMX9_DDR_PMU_EVENT_ATTR(eddrtq_pmon_ld_rdq0, ID(10, 66)), 310 NULL, 311 }; 312 313 static umode_t 314 ddr_perf_events_attrs_is_visible(struct kobject *kobj, 315 struct attribute *attr, int unused) 316 { 317 struct pmu *pmu = dev_get_drvdata(kobj_to_dev(kobj)); 318 struct ddr_pmu *ddr_pmu = to_ddr_pmu(pmu); 319 struct imx9_pmu_events_attr *eattr; 320 321 eattr = container_of(attr, typeof(*eattr), attr.attr); 322 323 if (!eattr->devtype_data) 324 return attr->mode; 325 326 if (eattr->devtype_data != ddr_pmu->devtype_data && 327 eattr->devtype_data->filter_ver != ddr_pmu->devtype_data->filter_ver) 328 return 0; 329 330 return attr->mode; 331 } 332 333 static const struct attribute_group ddr_perf_events_attr_group = { 334 .name = "events", 335 .attrs = ddr_perf_events_attrs, 336 .is_visible = ddr_perf_events_attrs_is_visible, 337 }; 338 339 PMU_FORMAT_ATTR(event, "config:0-7,16-23"); 340 PMU_FORMAT_ATTR(counter, "config:8-15"); 341 PMU_FORMAT_ATTR(axi_id, "config1:0-17"); 342 PMU_FORMAT_ATTR(axi_mask, "config2:0-17"); 343 344 static struct attribute *ddr_perf_format_attrs[] = { 345 &format_attr_event.attr, 346 &format_attr_counter.attr, 347 &format_attr_axi_id.attr, 348 &format_attr_axi_mask.attr, 349 NULL, 350 }; 351 352 static const struct attribute_group ddr_perf_format_attr_group = { 353 .name = "format", 354 .attrs = ddr_perf_format_attrs, 355 }; 356 357 static const struct attribute_group *attr_groups[] = { 358 &ddr_perf_identifier_attr_group, 359 &ddr_perf_cpumask_attr_group, 360 &ddr_perf_events_attr_group, 361 &ddr_perf_format_attr_group, 362 NULL, 363 }; 364 365 static void ddr_perf_clear_counter(struct ddr_pmu *pmu, int counter) 366 { 367 if (counter == CYCLES_COUNTER) { 368 writel(0, pmu->base + PMC(counter) + 0x4); 369 writel(0, pmu->base + PMC(counter)); 370 } else { 371 writel(0, pmu->base + PMC(counter)); 372 } 373 } 374 375 static u64 ddr_perf_read_counter(struct ddr_pmu *pmu, int counter) 376 { 377 u32 val_lower, val_upper; 378 u64 val; 379 380 if (counter != CYCLES_COUNTER) { 381 val = readl_relaxed(pmu->base + PMC(counter)); 382 goto out; 383 } 384 385 /* special handling for reading 64bit cycle counter */ 386 do { 387 val_upper = readl_relaxed(pmu->base + PMC(counter) + 0x4); 388 val_lower = readl_relaxed(pmu->base + PMC(counter)); 389 } while (val_upper != readl_relaxed(pmu->base + PMC(counter) + 0x4)); 390 391 val = val_upper; 392 val = (val << 32); 393 val |= val_lower; 394 out: 395 return val; 396 } 397 398 static void ddr_perf_counter_global_config(struct ddr_pmu *pmu, bool enable) 399 { 400 u32 ctrl; 401 402 ctrl = readl_relaxed(pmu->base + PMGC0); 403 404 if (enable) { 405 /* 406 * The performance monitor must be reset before event counting 407 * sequences. The performance monitor can be reset by first freezing 408 * one or more counters and then clearing the freeze condition to 409 * allow the counters to count according to the settings in the 410 * performance monitor registers. Counters can be frozen individually 411 * by setting PMLCAn[FC] bits, or simultaneously by setting PMGC0[FAC]. 412 * Simply clearing these freeze bits will then allow the performance 413 * monitor to begin counting based on the register settings. 414 */ 415 ctrl |= PMGC0_FAC; 416 writel(ctrl, pmu->base + PMGC0); 417 418 /* 419 * Freeze all counters disabled, interrupt enabled, and freeze 420 * counters on condition enabled. 421 */ 422 ctrl &= ~PMGC0_FAC; 423 ctrl |= PMGC0_PMIE | PMGC0_FCECE; 424 writel(ctrl, pmu->base + PMGC0); 425 } else { 426 ctrl |= PMGC0_FAC; 427 ctrl &= ~(PMGC0_PMIE | PMGC0_FCECE); 428 writel(ctrl, pmu->base + PMGC0); 429 } 430 } 431 432 static void ddr_perf_counter_local_config(struct ddr_pmu *pmu, int config, 433 int counter, bool enable) 434 { 435 u32 ctrl_a; 436 int event; 437 438 ctrl_a = readl_relaxed(pmu->base + PMLCA(counter)); 439 event = FIELD_GET(CONFIG_EVENT_MASK, config); 440 441 if (enable) { 442 ctrl_a |= PMLCA_FC; 443 writel(ctrl_a, pmu->base + PMLCA(counter)); 444 445 ddr_perf_clear_counter(pmu, counter); 446 447 /* Freeze counter disabled, condition enabled, and program event.*/ 448 ctrl_a &= ~PMLCA_FC; 449 ctrl_a |= PMLCA_CE; 450 ctrl_a &= ~FIELD_PREP(PMLCA_EVENT, 0x7F); 451 ctrl_a |= FIELD_PREP(PMLCA_EVENT, event); 452 writel(ctrl_a, pmu->base + PMLCA(counter)); 453 } else { 454 /* Freeze counter. */ 455 ctrl_a |= PMLCA_FC; 456 writel(ctrl_a, pmu->base + PMLCA(counter)); 457 } 458 } 459 460 static void imx93_ddr_perf_monitor_config(struct ddr_pmu *pmu, int event, 461 int counter, int axi_id, int axi_mask) 462 { 463 u32 pmcfg1, pmcfg2; 464 static const u32 mask[] = { 465 MX93_PMCFG1_RD_TRANS_FILT_EN, 466 MX93_PMCFG1_WR_TRANS_FILT_EN, 467 MX93_PMCFG1_RD_BT_FILT_EN 468 }; 469 470 pmcfg1 = readl_relaxed(pmu->base + PMCFG1); 471 472 if (counter >= 2 && counter <= 4) 473 pmcfg1 = event == 73 ? pmcfg1 | mask[counter - 2] : 474 pmcfg1 & ~mask[counter - 2]; 475 476 pmcfg1 &= ~FIELD_PREP(MX93_PMCFG1_ID_MASK, 0x3FFFF); 477 pmcfg1 |= FIELD_PREP(MX93_PMCFG1_ID_MASK, axi_mask); 478 writel_relaxed(pmcfg1, pmu->base + PMCFG1); 479 480 pmcfg2 = readl_relaxed(pmu->base + PMCFG2); 481 pmcfg2 &= ~FIELD_PREP(MX93_PMCFG2_ID, 0x3FFFF); 482 pmcfg2 |= FIELD_PREP(MX93_PMCFG2_ID, axi_id); 483 writel_relaxed(pmcfg2, pmu->base + PMCFG2); 484 } 485 486 static void imx95_ddr_perf_monitor_config(struct ddr_pmu *pmu, int event, 487 int counter, int axi_id, int axi_mask) 488 { 489 u32 pmcfg1, pmcfg, offset = 0; 490 491 pmcfg1 = readl_relaxed(pmu->base + PMCFG1); 492 493 if (event == 73) { 494 switch (counter) { 495 case 2: 496 pmcfg1 |= MX95_PMCFG1_WR_BEAT_FILT_EN; 497 offset = PMCFG3; 498 break; 499 case 3: 500 pmcfg1 |= MX95_PMCFG1_RD_BEAT_FILT_EN; 501 offset = PMCFG4; 502 break; 503 case 4: 504 pmcfg1 |= MX95_PMCFG1_RD_BEAT_FILT_EN; 505 offset = PMCFG5; 506 break; 507 case 5: 508 pmcfg1 |= MX95_PMCFG1_RD_BEAT_FILT_EN; 509 offset = PMCFG6; 510 break; 511 } 512 } else { 513 switch (counter) { 514 case 2: 515 pmcfg1 &= ~MX95_PMCFG1_WR_BEAT_FILT_EN; 516 break; 517 case 3: 518 case 4: 519 case 5: 520 pmcfg1 &= ~MX95_PMCFG1_RD_BEAT_FILT_EN; 521 break; 522 } 523 } 524 525 writel_relaxed(pmcfg1, pmu->base + PMCFG1); 526 527 if (offset) { 528 pmcfg = readl_relaxed(pmu->base + offset); 529 pmcfg &= ~(FIELD_PREP(MX95_PMCFG_ID_MASK, 0x3FF) | 530 FIELD_PREP(MX95_PMCFG_ID, 0x3FF)); 531 pmcfg |= (FIELD_PREP(MX95_PMCFG_ID_MASK, axi_mask) | 532 FIELD_PREP(MX95_PMCFG_ID, axi_id)); 533 writel_relaxed(pmcfg, pmu->base + offset); 534 } 535 } 536 537 static void ddr_perf_event_update(struct perf_event *event) 538 { 539 struct ddr_pmu *pmu = to_ddr_pmu(event->pmu); 540 struct hw_perf_event *hwc = &event->hw; 541 int counter = hwc->idx; 542 u64 new_raw_count; 543 544 new_raw_count = ddr_perf_read_counter(pmu, counter); 545 local64_add(new_raw_count, &event->count); 546 547 /* clear counter's value every time */ 548 ddr_perf_clear_counter(pmu, counter); 549 } 550 551 static int ddr_perf_event_init(struct perf_event *event) 552 { 553 struct ddr_pmu *pmu = to_ddr_pmu(event->pmu); 554 struct hw_perf_event *hwc = &event->hw; 555 struct perf_event *sibling; 556 557 if (event->attr.type != event->pmu->type) 558 return -ENOENT; 559 560 if (is_sampling_event(event) || event->attach_state & PERF_ATTACH_TASK) 561 return -EOPNOTSUPP; 562 563 if (event->cpu < 0) { 564 dev_warn(pmu->dev, "Can't provide per-task data!\n"); 565 return -EOPNOTSUPP; 566 } 567 568 /* 569 * We must NOT create groups containing mixed PMUs, although software 570 * events are acceptable (for example to create a CCN group 571 * periodically read when a hrtimer aka cpu-clock leader triggers). 572 */ 573 if (event->group_leader->pmu != event->pmu && 574 !is_software_event(event->group_leader)) 575 return -EINVAL; 576 577 for_each_sibling_event(sibling, event->group_leader) { 578 if (sibling->pmu != event->pmu && 579 !is_software_event(sibling)) 580 return -EINVAL; 581 } 582 583 event->cpu = pmu->cpu; 584 hwc->idx = -1; 585 586 return 0; 587 } 588 589 static void ddr_perf_event_start(struct perf_event *event, int flags) 590 { 591 struct ddr_pmu *pmu = to_ddr_pmu(event->pmu); 592 struct hw_perf_event *hwc = &event->hw; 593 int counter = hwc->idx; 594 595 local64_set(&hwc->prev_count, 0); 596 597 ddr_perf_counter_local_config(pmu, event->attr.config, counter, true); 598 hwc->state = 0; 599 } 600 601 static int ddr_perf_alloc_counter(struct ddr_pmu *pmu, int event, int counter) 602 { 603 int i; 604 605 if (event == CYCLES_EVENT_ID) { 606 // Cycles counter is dedicated for cycle event. 607 if (pmu->events[CYCLES_COUNTER] == NULL) 608 return CYCLES_COUNTER; 609 } else if (counter != 0) { 610 // Counter specific event use specific counter. 611 if (pmu->events[counter] == NULL) 612 return counter; 613 } else { 614 // Auto allocate counter for referene event. 615 for (i = 1; i < NUM_COUNTERS; i++) 616 if (pmu->events[i] == NULL) 617 return i; 618 } 619 620 return -ENOENT; 621 } 622 623 static int ddr_perf_event_add(struct perf_event *event, int flags) 624 { 625 struct ddr_pmu *pmu = to_ddr_pmu(event->pmu); 626 struct hw_perf_event *hwc = &event->hw; 627 int cfg = event->attr.config; 628 int cfg1 = event->attr.config1; 629 int cfg2 = event->attr.config2; 630 int event_id, counter; 631 632 event_id = FIELD_GET(CONFIG_EVENT_MASK, cfg); 633 counter = FIELD_GET(CONFIG_COUNTER_MASK, cfg); 634 635 counter = ddr_perf_alloc_counter(pmu, event_id, counter); 636 if (counter < 0) { 637 dev_dbg(pmu->dev, "There are not enough counters\n"); 638 return -EOPNOTSUPP; 639 } 640 641 pmu->events[counter] = event; 642 pmu->active_events++; 643 hwc->idx = counter; 644 hwc->state |= PERF_HES_STOPPED; 645 646 if (axi_filter_v1(pmu)) 647 /* read trans, write trans, read beat */ 648 imx93_ddr_perf_monitor_config(pmu, event_id, counter, cfg1, cfg2); 649 650 if (axi_filter_v2(pmu)) 651 /* write beat, read beat2, read beat1, read beat */ 652 imx95_ddr_perf_monitor_config(pmu, event_id, counter, cfg1, cfg2); 653 654 if (flags & PERF_EF_START) 655 ddr_perf_event_start(event, flags); 656 657 return 0; 658 } 659 660 static void ddr_perf_event_stop(struct perf_event *event, int flags) 661 { 662 struct ddr_pmu *pmu = to_ddr_pmu(event->pmu); 663 struct hw_perf_event *hwc = &event->hw; 664 int counter = hwc->idx; 665 666 ddr_perf_counter_local_config(pmu, event->attr.config, counter, false); 667 ddr_perf_event_update(event); 668 669 hwc->state |= PERF_HES_STOPPED; 670 } 671 672 static void ddr_perf_event_del(struct perf_event *event, int flags) 673 { 674 struct ddr_pmu *pmu = to_ddr_pmu(event->pmu); 675 struct hw_perf_event *hwc = &event->hw; 676 int counter = hwc->idx; 677 678 ddr_perf_event_stop(event, PERF_EF_UPDATE); 679 680 pmu->events[counter] = NULL; 681 pmu->active_events--; 682 hwc->idx = -1; 683 } 684 685 static void ddr_perf_pmu_enable(struct pmu *pmu) 686 { 687 struct ddr_pmu *ddr_pmu = to_ddr_pmu(pmu); 688 689 ddr_perf_counter_global_config(ddr_pmu, true); 690 } 691 692 static void ddr_perf_pmu_disable(struct pmu *pmu) 693 { 694 struct ddr_pmu *ddr_pmu = to_ddr_pmu(pmu); 695 696 ddr_perf_counter_global_config(ddr_pmu, false); 697 } 698 699 static void ddr_perf_init(struct ddr_pmu *pmu, void __iomem *base, 700 struct device *dev) 701 { 702 *pmu = (struct ddr_pmu) { 703 .pmu = (struct pmu) { 704 .module = THIS_MODULE, 705 .capabilities = PERF_PMU_CAP_NO_EXCLUDE, 706 .task_ctx_nr = perf_invalid_context, 707 .attr_groups = attr_groups, 708 .event_init = ddr_perf_event_init, 709 .add = ddr_perf_event_add, 710 .del = ddr_perf_event_del, 711 .start = ddr_perf_event_start, 712 .stop = ddr_perf_event_stop, 713 .read = ddr_perf_event_update, 714 .pmu_enable = ddr_perf_pmu_enable, 715 .pmu_disable = ddr_perf_pmu_disable, 716 }, 717 .base = base, 718 .dev = dev, 719 }; 720 } 721 722 static irqreturn_t ddr_perf_irq_handler(int irq, void *p) 723 { 724 struct ddr_pmu *pmu = (struct ddr_pmu *)p; 725 struct perf_event *event; 726 int i; 727 728 /* 729 * Counters can generate an interrupt on an overflow when msb of a 730 * counter changes from 0 to 1. For the interrupt to be signalled, 731 * below condition mush be satisfied: 732 * PMGC0[PMIE] = 1, PMGC0[FCECE] = 1, PMLCAn[CE] = 1 733 * When an interrupt is signalled, PMGC0[FAC] is set by hardware and 734 * all of the registers are frozen. 735 * Software can clear the interrupt condition by resetting the performance 736 * monitor and clearing the most significant bit of the counter that 737 * generate the overflow. 738 */ 739 for (i = 0; i < NUM_COUNTERS; i++) { 740 if (!pmu->events[i]) 741 continue; 742 743 event = pmu->events[i]; 744 745 ddr_perf_event_update(event); 746 } 747 748 ddr_perf_counter_global_config(pmu, true); 749 750 return IRQ_HANDLED; 751 } 752 753 static int ddr_perf_offline_cpu(unsigned int cpu, struct hlist_node *node) 754 { 755 struct ddr_pmu *pmu = hlist_entry_safe(node, struct ddr_pmu, node); 756 int target; 757 758 if (cpu != pmu->cpu) 759 return 0; 760 761 target = cpumask_any_but(cpu_online_mask, cpu); 762 if (target >= nr_cpu_ids) 763 return 0; 764 765 perf_pmu_migrate_context(&pmu->pmu, cpu, target); 766 pmu->cpu = target; 767 768 WARN_ON(irq_set_affinity(pmu->irq, cpumask_of(pmu->cpu))); 769 770 return 0; 771 } 772 773 static int ddr_perf_probe(struct platform_device *pdev) 774 { 775 struct ddr_pmu *pmu; 776 void __iomem *base; 777 int ret, irq; 778 char *name; 779 780 base = devm_platform_ioremap_resource(pdev, 0); 781 if (IS_ERR(base)) 782 return PTR_ERR(base); 783 784 pmu = devm_kzalloc(&pdev->dev, sizeof(*pmu), GFP_KERNEL); 785 if (!pmu) 786 return -ENOMEM; 787 788 ddr_perf_init(pmu, base, &pdev->dev); 789 790 pmu->devtype_data = of_device_get_match_data(&pdev->dev); 791 792 platform_set_drvdata(pdev, pmu); 793 794 pmu->id = ida_alloc(&ddr_ida, GFP_KERNEL); 795 name = devm_kasprintf(&pdev->dev, GFP_KERNEL, DDR_PERF_DEV_NAME "%d", pmu->id); 796 if (!name) { 797 ret = -ENOMEM; 798 goto format_string_err; 799 } 800 801 pmu->cpu = raw_smp_processor_id(); 802 ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, DDR_CPUHP_CB_NAME, 803 NULL, ddr_perf_offline_cpu); 804 if (ret < 0) { 805 dev_err(&pdev->dev, "Failed to add callbacks for multi state\n"); 806 goto cpuhp_state_err; 807 } 808 pmu->cpuhp_state = ret; 809 810 /* Register the pmu instance for cpu hotplug */ 811 ret = cpuhp_state_add_instance_nocalls(pmu->cpuhp_state, &pmu->node); 812 if (ret) { 813 dev_err(&pdev->dev, "Error %d registering hotplug\n", ret); 814 goto cpuhp_instance_err; 815 } 816 817 /* Request irq */ 818 irq = platform_get_irq(pdev, 0); 819 if (irq < 0) { 820 ret = irq; 821 goto ddr_perf_err; 822 } 823 824 ret = devm_request_irq(&pdev->dev, irq, ddr_perf_irq_handler, 825 IRQF_NOBALANCING | IRQF_NO_THREAD, 826 DDR_CPUHP_CB_NAME, pmu); 827 if (ret < 0) { 828 dev_err(&pdev->dev, "Request irq failed: %d", ret); 829 goto ddr_perf_err; 830 } 831 832 pmu->irq = irq; 833 ret = irq_set_affinity(pmu->irq, cpumask_of(pmu->cpu)); 834 if (ret) { 835 dev_err(pmu->dev, "Failed to set interrupt affinity\n"); 836 goto ddr_perf_err; 837 } 838 839 ret = perf_pmu_register(&pmu->pmu, name, -1); 840 if (ret) 841 goto ddr_perf_err; 842 843 return 0; 844 845 ddr_perf_err: 846 cpuhp_state_remove_instance_nocalls(pmu->cpuhp_state, &pmu->node); 847 cpuhp_instance_err: 848 cpuhp_remove_multi_state(pmu->cpuhp_state); 849 cpuhp_state_err: 850 format_string_err: 851 ida_free(&ddr_ida, pmu->id); 852 dev_warn(&pdev->dev, "i.MX9 DDR Perf PMU failed (%d), disabled\n", ret); 853 return ret; 854 } 855 856 static void ddr_perf_remove(struct platform_device *pdev) 857 { 858 struct ddr_pmu *pmu = platform_get_drvdata(pdev); 859 860 cpuhp_state_remove_instance_nocalls(pmu->cpuhp_state, &pmu->node); 861 cpuhp_remove_multi_state(pmu->cpuhp_state); 862 863 perf_pmu_unregister(&pmu->pmu); 864 865 ida_free(&ddr_ida, pmu->id); 866 } 867 868 static struct platform_driver imx_ddr_pmu_driver = { 869 .driver = { 870 .name = "imx9-ddr-pmu", 871 .of_match_table = imx_ddr_pmu_dt_ids, 872 .suppress_bind_attrs = true, 873 }, 874 .probe = ddr_perf_probe, 875 .remove = ddr_perf_remove, 876 }; 877 module_platform_driver(imx_ddr_pmu_driver); 878 879 MODULE_AUTHOR("Xu Yang <xu.yang_2@nxp.com>"); 880 MODULE_LICENSE("GPL v2"); 881 MODULE_DESCRIPTION("DDRC PerfMon for i.MX9 SoCs"); 882