drivers/perf/arm-ccn.c

   1 /*
   2  * This program is free software; you can redistribute it and/or modify
   3  * it under the terms of the GNU General Public License version 2 as
   4  * published by the Free Software Foundation.
   5  *
   6  * This program is distributed in the hope that it will be useful,
   7  * but WITHOUT ANY WARRANTY; without even the implied warranty of
   8  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   9  * GNU General Public License for more details.
  10  *
  11  * Copyright (C) 2014 ARM Limited
  12  */
  13
  14 #include <linux/ctype.h>
  15 #include <linux/hrtimer.h>
  16 #include <linux/idr.h>
  17 #include <linux/interrupt.h>
  18 #include <linux/io.h>
  19 #include <linux/module.h>
  20 #include <linux/mod_devicetable.h>
  21 #include <linux/perf_event.h>
  22 #include <linux/platform_device.h>
  23 #include <linux/slab.h>
  24
  25 #define CCN_NUM_XP_PORTS 2
  26 #define CCN_NUM_VCS 4
  27 #define CCN_NUM_REGIONS 256
  28 #define CCN_REGION_SIZE 0x10000
  29
  30 #define CCN_ALL_OLY_ID                  0xff00
  31 #define CCN_ALL_OLY_ID__OLY_ID__SHIFT                   0
  32 #define CCN_ALL_OLY_ID__OLY_ID__MASK                    0x1f
  33 #define CCN_ALL_OLY_ID__NODE_ID__SHIFT                  8
  34 #define CCN_ALL_OLY_ID__NODE_ID__MASK                   0x3f
  35
  36 #define CCN_MN_ERRINT_STATUS            0x0008
  37 #define CCN_MN_ERRINT_STATUS__INTREQ__DESSERT           0x11
  38 #define CCN_MN_ERRINT_STATUS__ALL_ERRORS__ENABLE        0x02
  39 #define CCN_MN_ERRINT_STATUS__ALL_ERRORS__DISABLED      0x20
  40 #define CCN_MN_ERRINT_STATUS__ALL_ERRORS__DISABLE       0x22
  41 #define CCN_MN_ERRINT_STATUS__CORRECTED_ERRORS_ENABLE   0x04
  42 #define CCN_MN_ERRINT_STATUS__CORRECTED_ERRORS_DISABLED 0x40
  43 #define CCN_MN_ERRINT_STATUS__CORRECTED_ERRORS_DISABLE  0x44
  44 #define CCN_MN_ERRINT_STATUS__PMU_EVENTS__ENABLE        0x08
  45 #define CCN_MN_ERRINT_STATUS__PMU_EVENTS__DISABLED      0x80
  46 #define CCN_MN_ERRINT_STATUS__PMU_EVENTS__DISABLE       0x88
  47 #define CCN_MN_OLY_COMP_LIST_63_0       0x01e0
  48 #define CCN_MN_ERR_SIG_VAL_63_0         0x0300
  49 #define CCN_MN_ERR_SIG_VAL_63_0__DT                     (1 << 1)
  50
  51 #define CCN_DT_ACTIVE_DSM               0x0000
  52 #define CCN_DT_ACTIVE_DSM__DSM_ID__SHIFT(n)             ((n) * 8)
  53 #define CCN_DT_ACTIVE_DSM__DSM_ID__MASK                 0xff
  54 #define CCN_DT_CTL                      0x0028
  55 #define CCN_DT_CTL__DT_EN                               (1 << 0)
  56 #define CCN_DT_PMEVCNT(n)               (0x0100 + (n) * 0x8)
  57 #define CCN_DT_PMCCNTR                  0x0140
  58 #define CCN_DT_PMCCNTRSR                0x0190
  59 #define CCN_DT_PMOVSR                   0x0198
  60 #define CCN_DT_PMOVSR_CLR               0x01a0
  61 #define CCN_DT_PMOVSR_CLR__MASK                         0x1f
  62 #define CCN_DT_PMCR                     0x01a8
  63 #define CCN_DT_PMCR__OVFL_INTR_EN                       (1 << 6)
  64 #define CCN_DT_PMCR__PMU_EN                             (1 << 0)
  65 #define CCN_DT_PMSR                     0x01b0
  66 #define CCN_DT_PMSR_REQ                 0x01b8
  67 #define CCN_DT_PMSR_CLR                 0x01c0
  68
  69 #define CCN_HNF_PMU_EVENT_SEL           0x0600
  70 #define CCN_HNF_PMU_EVENT_SEL__ID__SHIFT(n)             ((n) * 4)
  71 #define CCN_HNF_PMU_EVENT_SEL__ID__MASK                 0xf
  72
  73 #define CCN_XP_DT_CONFIG                0x0300
  74 #define CCN_XP_DT_CONFIG__DT_CFG__SHIFT(n)              ((n) * 4)
  75 #define CCN_XP_DT_CONFIG__DT_CFG__MASK                  0xf
  76 #define CCN_XP_DT_CONFIG__DT_CFG__PASS_THROUGH          0x0
  77 #define CCN_XP_DT_CONFIG__DT_CFG__WATCHPOINT_0_OR_1     0x1
  78 #define CCN_XP_DT_CONFIG__DT_CFG__WATCHPOINT(n)         (0x2 + (n))
  79 #define CCN_XP_DT_CONFIG__DT_CFG__XP_PMU_EVENT(n)       (0x4 + (n))
  80 #define CCN_XP_DT_CONFIG__DT_CFG__DEVICE_PMU_EVENT(d, n) (0x8 + (d) * 4 + (n))
  81 #define CCN_XP_DT_INTERFACE_SEL         0x0308
  82 #define CCN_XP_DT_INTERFACE_SEL__DT_IO_SEL__SHIFT(n)    (0 + (n) * 8)
  83 #define CCN_XP_DT_INTERFACE_SEL__DT_IO_SEL__MASK        0x1
  84 #define CCN_XP_DT_INTERFACE_SEL__DT_DEV_SEL__SHIFT(n)   (1 + (n) * 8)
  85 #define CCN_XP_DT_INTERFACE_SEL__DT_DEV_SEL__MASK       0x1
  86 #define CCN_XP_DT_INTERFACE_SEL__DT_VC_SEL__SHIFT(n)    (2 + (n) * 8)
  87 #define CCN_XP_DT_INTERFACE_SEL__DT_VC_SEL__MASK        0x3
  88 #define CCN_XP_DT_CMP_VAL_L(n)          (0x0310 + (n) * 0x40)
  89 #define CCN_XP_DT_CMP_VAL_H(n)          (0x0318 + (n) * 0x40)
  90 #define CCN_XP_DT_CMP_MASK_L(n)         (0x0320 + (n) * 0x40)
  91 #define CCN_XP_DT_CMP_MASK_H(n)         (0x0328 + (n) * 0x40)
  92 #define CCN_XP_DT_CONTROL               0x0370
  93 #define CCN_XP_DT_CONTROL__DT_ENABLE                    (1 << 0)
  94 #define CCN_XP_DT_CONTROL__WP_ARM_SEL__SHIFT(n)         (12 + (n) * 4)
  95 #define CCN_XP_DT_CONTROL__WP_ARM_SEL__MASK             0xf
  96 #define CCN_XP_DT_CONTROL__WP_ARM_SEL__ALWAYS           0xf
  97 #define CCN_XP_PMU_EVENT_SEL            0x0600
  98 #define CCN_XP_PMU_EVENT_SEL__ID__SHIFT(n)              ((n) * 7)
  99 #define CCN_XP_PMU_EVENT_SEL__ID__MASK                  0x3f
 100
 101 #define CCN_SBAS_PMU_EVENT_SEL          0x0600
 102 #define CCN_SBAS_PMU_EVENT_SEL__ID__SHIFT(n)            ((n) * 4)
 103 #define CCN_SBAS_PMU_EVENT_SEL__ID__MASK                0xf
 104
 105 #define CCN_RNI_PMU_EVENT_SEL           0x0600
 106 #define CCN_RNI_PMU_EVENT_SEL__ID__SHIFT(n)             ((n) * 4)
 107 #define CCN_RNI_PMU_EVENT_SEL__ID__MASK                 0xf
 108
 109 #define CCN_TYPE_MN     0x01
 110 #define CCN_TYPE_DT     0x02
 111 #define CCN_TYPE_HNF    0x04
 112 #define CCN_TYPE_HNI    0x05
 113 #define CCN_TYPE_XP     0x08
 114 #define CCN_TYPE_SBSX   0x0c
 115 #define CCN_TYPE_SBAS   0x10
 116 #define CCN_TYPE_RNI_1P 0x14
 117 #define CCN_TYPE_RNI_2P 0x15
 118 #define CCN_TYPE_RNI_3P 0x16
 119 #define CCN_TYPE_RND_1P 0x18 /* RN-D = RN-I + DVM */
 120 #define CCN_TYPE_RND_2P 0x19
 121 #define CCN_TYPE_RND_3P 0x1a
 122 #define CCN_TYPE_CYCLES 0xff /* Pseudotype */
 123
 124 #define CCN_EVENT_WATCHPOINT 0xfe /* Pseudoevent */
 125
 126 #define CCN_NUM_PMU_EVENTS              4
 127 #define CCN_NUM_XP_WATCHPOINTS          2 /* See DT.dbg_id.num_watchpoints */
 128 #define CCN_NUM_PMU_EVENT_COUNTERS      8 /* See DT.dbg_id.num_pmucntr */
 129 #define CCN_IDX_PMU_CYCLE_COUNTER       CCN_NUM_PMU_EVENT_COUNTERS
 130
 131 #define CCN_NUM_PREDEFINED_MASKS        4
 132 #define CCN_IDX_MASK_ANY                (CCN_NUM_PMU_EVENT_COUNTERS + 0)
 133 #define CCN_IDX_MASK_EXACT              (CCN_NUM_PMU_EVENT_COUNTERS + 1)
 134 #define CCN_IDX_MASK_ORDER              (CCN_NUM_PMU_EVENT_COUNTERS + 2)
 135 #define CCN_IDX_MASK_OPCODE             (CCN_NUM_PMU_EVENT_COUNTERS + 3)
 136
 137 struct arm_ccn_component {
 138         void __iomem *base;
 139         u32 type;
 140
 141         DECLARE_BITMAP(pmu_events_mask, CCN_NUM_PMU_EVENTS);
 142         union {
 143                 struct {
 144                         DECLARE_BITMAP(dt_cmp_mask, CCN_NUM_XP_WATCHPOINTS);
 145                 } xp;
 146         };
 147 };
 148
 149 #define pmu_to_arm_ccn(_pmu) container_of(container_of(_pmu, \
 150         struct arm_ccn_dt, pmu), struct arm_ccn, dt)
 151
 152 struct arm_ccn_dt {
 153         int id;
 154         void __iomem *base;
 155
 156         spinlock_t config_lock;
 157
 158         DECLARE_BITMAP(pmu_counters_mask, CCN_NUM_PMU_EVENT_COUNTERS + 1);
 159         struct {
 160                 struct arm_ccn_component *source;
 161                 struct perf_event *event;
 162         } pmu_counters[CCN_NUM_PMU_EVENT_COUNTERS + 1];
 163
 164         struct {
 165                u64 l, h;
 166         } cmp_mask[CCN_NUM_PMU_EVENT_COUNTERS + CCN_NUM_PREDEFINED_MASKS];
 167
 168         struct hrtimer hrtimer;
 169
 170         cpumask_t cpu;
 171         struct hlist_node node;
 172
 173         struct pmu pmu;
 174 };
 175
 176 struct arm_ccn {
 177         struct device *dev;
 178         void __iomem *base;
 179         unsigned int irq;
 180
 181         unsigned sbas_present:1;
 182         unsigned sbsx_present:1;
 183
 184         int num_nodes;
 185         struct arm_ccn_component *node;
 186
 187         int num_xps;
 188         struct arm_ccn_component *xp;
 189
 190         struct arm_ccn_dt dt;
 191         int mn_id;
 192 };
 193
 194 static int arm_ccn_node_to_xp(int node)
 195 {
 196         return node / CCN_NUM_XP_PORTS;
 197 }
 198
 199 static int arm_ccn_node_to_xp_port(int node)
 200 {
 201         return node % CCN_NUM_XP_PORTS;
 202 }
 203
 204
 205 /*
 206  * Bit shifts and masks in these defines must be kept in sync with
 207  * arm_ccn_pmu_config_set() and CCN_FORMAT_ATTRs below!
 208  */
 209 #define CCN_CONFIG_NODE(_config)        (((_config) >> 0) & 0xff)
 210 #define CCN_CONFIG_XP(_config)          (((_config) >> 0) & 0xff)
 211 #define CCN_CONFIG_TYPE(_config)        (((_config) >> 8) & 0xff)
 212 #define CCN_CONFIG_EVENT(_config)       (((_config) >> 16) & 0xff)
 213 #define CCN_CONFIG_PORT(_config)        (((_config) >> 24) & 0x3)
 214 #define CCN_CONFIG_BUS(_config)         (((_config) >> 24) & 0x3)
 215 #define CCN_CONFIG_VC(_config)          (((_config) >> 26) & 0x7)
 216 #define CCN_CONFIG_DIR(_config)         (((_config) >> 29) & 0x1)
 217 #define CCN_CONFIG_MASK(_config)        (((_config) >> 30) & 0xf)
 218
 219 static void arm_ccn_pmu_config_set(u64 *config, u32 node_xp, u32 type, u32 port)
 220 {
 221         *config &= ~((0xff << 0) | (0xff << 8) | (0x3 << 24));
 222         *config |= (node_xp << 0) | (type << 8) | (port << 24);
 223 }
 224
 225 static ssize_t arm_ccn_pmu_format_show(struct device *dev,
 226                 struct device_attribute *attr, char *buf)
 227 {
 228         struct dev_ext_attribute *ea = container_of(attr,
 229                         struct dev_ext_attribute, attr);
 230
 231         return snprintf(buf, PAGE_SIZE, "%s\n", (char *)ea->var);
 232 }
 233
 234 #define CCN_FORMAT_ATTR(_name, _config) \
 235         struct dev_ext_attribute arm_ccn_pmu_format_attr_##_name = \
 236                         { __ATTR(_name, S_IRUGO, arm_ccn_pmu_format_show, \
 237                         NULL), _config }
 238
 239 static CCN_FORMAT_ATTR(node, "config:0-7");
 240 static CCN_FORMAT_ATTR(xp, "config:0-7");
 241 static CCN_FORMAT_ATTR(type, "config:8-15");
 242 static CCN_FORMAT_ATTR(event, "config:16-23");
 243 static CCN_FORMAT_ATTR(port, "config:24-25");
 244 static CCN_FORMAT_ATTR(bus, "config:24-25");
 245 static CCN_FORMAT_ATTR(vc, "config:26-28");
 246 static CCN_FORMAT_ATTR(dir, "config:29-29");
 247 static CCN_FORMAT_ATTR(mask, "config:30-33");
 248 static CCN_FORMAT_ATTR(cmp_l, "config1:0-62");
 249 static CCN_FORMAT_ATTR(cmp_h, "config2:0-59");
 250
 251 static struct attribute *arm_ccn_pmu_format_attrs[] = {
 252         &arm_ccn_pmu_format_attr_node.attr.attr,
 253         &arm_ccn_pmu_format_attr_xp.attr.attr,
 254         &arm_ccn_pmu_format_attr_type.attr.attr,
 255         &arm_ccn_pmu_format_attr_event.attr.attr,
 256         &arm_ccn_pmu_format_attr_port.attr.attr,
 257         &arm_ccn_pmu_format_attr_bus.attr.attr,
 258         &arm_ccn_pmu_format_attr_vc.attr.attr,
 259         &arm_ccn_pmu_format_attr_dir.attr.attr,
 260         &arm_ccn_pmu_format_attr_mask.attr.attr,
 261         &arm_ccn_pmu_format_attr_cmp_l.attr.attr,
 262         &arm_ccn_pmu_format_attr_cmp_h.attr.attr,
 263         NULL
 264 };
 265
 266 static const struct attribute_group arm_ccn_pmu_format_attr_group = {
 267         .name = "format",
 268         .attrs = arm_ccn_pmu_format_attrs,
 269 };
 270
 271
 272 struct arm_ccn_pmu_event {
 273         struct device_attribute attr;
 274         u32 type;
 275         u32 event;
 276         int num_ports;
 277         int num_vcs;
 278         const char *def;
 279         int mask;
 280 };
 281
 282 #define CCN_EVENT_ATTR(_name) \
 283         __ATTR(_name, S_IRUGO, arm_ccn_pmu_event_show, NULL)
 284
 285 /*
 286  * Events defined in TRM for MN, HN-I and SBSX are actually watchpoints set on
 287  * their ports in XP they are connected to. For the sake of usability they are
 288  * explicitly defined here (and translated into a relevant watchpoint in
 289  * arm_ccn_pmu_event_init()) so the user can easily request them without deep
 290  * knowledge of the flit format.
 291  */
 292
 293 #define CCN_EVENT_MN(_name, _def, _mask) { .attr = CCN_EVENT_ATTR(mn_##_name), \
 294                 .type = CCN_TYPE_MN, .event = CCN_EVENT_WATCHPOINT, \
 295                 .num_ports = CCN_NUM_XP_PORTS, .num_vcs = CCN_NUM_VCS, \
 296                 .def = _def, .mask = _mask, }
 297
 298 #define CCN_EVENT_HNI(_name, _def, _mask) { \
 299                 .attr = CCN_EVENT_ATTR(hni_##_name), .type = CCN_TYPE_HNI, \
 300                 .event = CCN_EVENT_WATCHPOINT, .num_ports = CCN_NUM_XP_PORTS, \
 301                 .num_vcs = CCN_NUM_VCS, .def = _def, .mask = _mask, }
 302
 303 #define CCN_EVENT_SBSX(_name, _def, _mask) { \
 304                 .attr = CCN_EVENT_ATTR(sbsx_##_name), .type = CCN_TYPE_SBSX, \
 305                 .event = CCN_EVENT_WATCHPOINT, .num_ports = CCN_NUM_XP_PORTS, \
 306                 .num_vcs = CCN_NUM_VCS, .def = _def, .mask = _mask, }
 307
 308 #define CCN_EVENT_HNF(_name, _event) { .attr = CCN_EVENT_ATTR(hnf_##_name), \
 309                 .type = CCN_TYPE_HNF, .event = _event, }
 310
 311 #define CCN_EVENT_XP(_name, _event) { .attr = CCN_EVENT_ATTR(xp_##_name), \
 312                 .type = CCN_TYPE_XP, .event = _event, \
 313                 .num_ports = CCN_NUM_XP_PORTS, .num_vcs = CCN_NUM_VCS, }
 314
 315 /*
 316  * RN-I & RN-D (RN-D = RN-I + DVM) nodes have different type ID depending
 317  * on configuration. One of them is picked to represent the whole group,
 318  * as they all share the same event types.
 319  */
 320 #define CCN_EVENT_RNI(_name, _event) { .attr = CCN_EVENT_ATTR(rni_##_name), \
 321                 .type = CCN_TYPE_RNI_3P, .event = _event, }
 322
 323 #define CCN_EVENT_SBAS(_name, _event) { .attr = CCN_EVENT_ATTR(sbas_##_name), \
 324                 .type = CCN_TYPE_SBAS, .event = _event, }
 325
 326 #define CCN_EVENT_CYCLES(_name) { .attr = CCN_EVENT_ATTR(_name), \
 327                 .type = CCN_TYPE_CYCLES }
 328
 329
 330 static ssize_t arm_ccn_pmu_event_show(struct device *dev,
 331                 struct device_attribute *attr, char *buf)
 332 {
 333         struct arm_ccn *ccn = pmu_to_arm_ccn(dev_get_drvdata(dev));
 334         struct arm_ccn_pmu_event *event = container_of(attr,
 335                         struct arm_ccn_pmu_event, attr);
 336         ssize_t res;
 337
 338         res = snprintf(buf, PAGE_SIZE, "type=0x%x", event->type);
 339         if (event->event)
 340                 res += snprintf(buf + res, PAGE_SIZE - res, ",event=0x%x",
 341                                 event->event);
 342         if (event->def)
 343                 res += snprintf(buf + res, PAGE_SIZE - res, ",%s",
 344                                 event->def);
 345         if (event->mask)
 346                 res += snprintf(buf + res, PAGE_SIZE - res, ",mask=0x%x",
 347                                 event->mask);
 348
 349         /* Arguments required by an event */
 350         switch (event->type) {
 351         case CCN_TYPE_CYCLES:
 352                 break;
 353         case CCN_TYPE_XP:
 354                 res += snprintf(buf + res, PAGE_SIZE - res,
 355                                 ",xp=?,vc=?");
 356                 if (event->event == CCN_EVENT_WATCHPOINT)
 357                         res += snprintf(buf + res, PAGE_SIZE - res,
 358                                         ",port=?,dir=?,cmp_l=?,cmp_h=?,mask=?");
 359                 else
 360                         res += snprintf(buf + res, PAGE_SIZE - res,
 361                                         ",bus=?");
 362
 363                 break;
 364         case CCN_TYPE_MN:
 365                 res += snprintf(buf + res, PAGE_SIZE - res, ",node=%d", ccn->mn_id);
 366                 break;
 367         default:
 368                 res += snprintf(buf + res, PAGE_SIZE - res, ",node=?");
 369                 break;
 370         }
 371
 372         res += snprintf(buf + res, PAGE_SIZE - res, "\n");
 373
 374         return res;
 375 }
 376
 377 static umode_t arm_ccn_pmu_events_is_visible(struct kobject *kobj,
 378                                      struct attribute *attr, int index)
 379 {
 380         struct device *dev = kobj_to_dev(kobj);
 381         struct arm_ccn *ccn = pmu_to_arm_ccn(dev_get_drvdata(dev));
 382         struct device_attribute *dev_attr = container_of(attr,
 383                         struct device_attribute, attr);
 384         struct arm_ccn_pmu_event *event = container_of(dev_attr,
 385                         struct arm_ccn_pmu_event, attr);
 386
 387         if (event->type == CCN_TYPE_SBAS && !ccn->sbas_present)
 388                 return 0;
 389         if (event->type == CCN_TYPE_SBSX && !ccn->sbsx_present)
 390                 return 0;
 391
 392         return attr->mode;
 393 }
 394
 395 static struct arm_ccn_pmu_event arm_ccn_pmu_events[] = {
 396         CCN_EVENT_MN(eobarrier, "dir=1,vc=0,cmp_h=0x1c00", CCN_IDX_MASK_OPCODE),
 397         CCN_EVENT_MN(ecbarrier, "dir=1,vc=0,cmp_h=0x1e00", CCN_IDX_MASK_OPCODE),
 398         CCN_EVENT_MN(dvmop, "dir=1,vc=0,cmp_h=0x2800", CCN_IDX_MASK_OPCODE),
 399         CCN_EVENT_HNI(txdatflits, "dir=1,vc=3", CCN_IDX_MASK_ANY),
 400         CCN_EVENT_HNI(rxdatflits, "dir=0,vc=3", CCN_IDX_MASK_ANY),
 401         CCN_EVENT_HNI(txreqflits, "dir=1,vc=0", CCN_IDX_MASK_ANY),
 402         CCN_EVENT_HNI(rxreqflits, "dir=0,vc=0", CCN_IDX_MASK_ANY),
 403         CCN_EVENT_HNI(rxreqflits_order, "dir=0,vc=0,cmp_h=0x8000",
 404                         CCN_IDX_MASK_ORDER),
 405         CCN_EVENT_SBSX(txdatflits, "dir=1,vc=3", CCN_IDX_MASK_ANY),
 406         CCN_EVENT_SBSX(rxdatflits, "dir=0,vc=3", CCN_IDX_MASK_ANY),
 407         CCN_EVENT_SBSX(txreqflits, "dir=1,vc=0", CCN_IDX_MASK_ANY),
 408         CCN_EVENT_SBSX(rxreqflits, "dir=0,vc=0", CCN_IDX_MASK_ANY),
 409         CCN_EVENT_SBSX(rxreqflits_order, "dir=0,vc=0,cmp_h=0x8000",
 410                         CCN_IDX_MASK_ORDER),
 411         CCN_EVENT_HNF(cache_miss, 0x1),
 412         CCN_EVENT_HNF(l3_sf_cache_access, 0x02),
 413         CCN_EVENT_HNF(cache_fill, 0x3),
 414         CCN_EVENT_HNF(pocq_retry, 0x4),
 415         CCN_EVENT_HNF(pocq_reqs_recvd, 0x5),
 416         CCN_EVENT_HNF(sf_hit, 0x6),
 417         CCN_EVENT_HNF(sf_evictions, 0x7),
 418         CCN_EVENT_HNF(snoops_sent, 0x8),
 419         CCN_EVENT_HNF(snoops_broadcast, 0x9),
 420         CCN_EVENT_HNF(l3_eviction, 0xa),
 421         CCN_EVENT_HNF(l3_fill_invalid_way, 0xb),
 422         CCN_EVENT_HNF(mc_retries, 0xc),
 423         CCN_EVENT_HNF(mc_reqs, 0xd),
 424         CCN_EVENT_HNF(qos_hh_retry, 0xe),
 425         CCN_EVENT_RNI(rdata_beats_p0, 0x1),
 426         CCN_EVENT_RNI(rdata_beats_p1, 0x2),
 427         CCN_EVENT_RNI(rdata_beats_p2, 0x3),
 428         CCN_EVENT_RNI(rxdat_flits, 0x4),
 429         CCN_EVENT_RNI(txdat_flits, 0x5),
 430         CCN_EVENT_RNI(txreq_flits, 0x6),
 431         CCN_EVENT_RNI(txreq_flits_retried, 0x7),
 432         CCN_EVENT_RNI(rrt_full, 0x8),
 433         CCN_EVENT_RNI(wrt_full, 0x9),
 434         CCN_EVENT_RNI(txreq_flits_replayed, 0xa),
 435         CCN_EVENT_XP(upload_starvation, 0x1),
 436         CCN_EVENT_XP(download_starvation, 0x2),
 437         CCN_EVENT_XP(respin, 0x3),
 438         CCN_EVENT_XP(valid_flit, 0x4),
 439         CCN_EVENT_XP(watchpoint, CCN_EVENT_WATCHPOINT),
 440         CCN_EVENT_SBAS(rdata_beats_p0, 0x1),
 441         CCN_EVENT_SBAS(rxdat_flits, 0x4),
 442         CCN_EVENT_SBAS(txdat_flits, 0x5),
 443         CCN_EVENT_SBAS(txreq_flits, 0x6),
 444         CCN_EVENT_SBAS(txreq_flits_retried, 0x7),
 445         CCN_EVENT_SBAS(rrt_full, 0x8),
 446         CCN_EVENT_SBAS(wrt_full, 0x9),
 447         CCN_EVENT_SBAS(txreq_flits_replayed, 0xa),
 448         CCN_EVENT_CYCLES(cycles),
 449 };
 450
 451 /* Populated in arm_ccn_init() */
 452 static struct attribute
 453                 *arm_ccn_pmu_events_attrs[ARRAY_SIZE(arm_ccn_pmu_events) + 1];
 454
 455 static const struct attribute_group arm_ccn_pmu_events_attr_group = {
 456         .name = "events",
 457         .is_visible = arm_ccn_pmu_events_is_visible,
 458         .attrs = arm_ccn_pmu_events_attrs,
 459 };
 460
 461
 462 static u64 *arm_ccn_pmu_get_cmp_mask(struct arm_ccn *ccn, const char *name)
 463 {
 464         unsigned long i;
 465
 466         if (WARN_ON(!name || !name[0] || !isxdigit(name[0]) || !name[1]))
 467                 return NULL;
 468         i = isdigit(name[0]) ? name[0] - '0' : 0xa + tolower(name[0]) - 'a';
 469
 470         switch (name[1]) {
 471         case 'l':
 472                 return &ccn->dt.cmp_mask[i].l;
 473         case 'h':
 474                 return &ccn->dt.cmp_mask[i].h;
 475         default:
 476                 return NULL;
 477         }
 478 }
 479
 480 static ssize_t arm_ccn_pmu_cmp_mask_show(struct device *dev,
 481                 struct device_attribute *attr, char *buf)
 482 {
 483         struct arm_ccn *ccn = pmu_to_arm_ccn(dev_get_drvdata(dev));
 484         u64 *mask = arm_ccn_pmu_get_cmp_mask(ccn, attr->attr.name);
 485
 486         return mask ? snprintf(buf, PAGE_SIZE, "0x%016llx\n", *mask) : -EINVAL;
 487 }
 488
 489 static ssize_t arm_ccn_pmu_cmp_mask_store(struct device *dev,
 490                 struct device_attribute *attr, const char *buf, size_t count)
 491 {
 492         struct arm_ccn *ccn = pmu_to_arm_ccn(dev_get_drvdata(dev));
 493         u64 *mask = arm_ccn_pmu_get_cmp_mask(ccn, attr->attr.name);
 494         int err = -EINVAL;
 495
 496         if (mask)
 497                 err = kstrtoull(buf, 0, mask);
 498
 499         return err ? err : count;
 500 }
 501
 502 #define CCN_CMP_MASK_ATTR(_name) \
 503         struct device_attribute arm_ccn_pmu_cmp_mask_attr_##_name = \
 504                         __ATTR(_name, S_IRUGO | S_IWUSR, \
 505                         arm_ccn_pmu_cmp_mask_show, arm_ccn_pmu_cmp_mask_store)
 506
 507 #define CCN_CMP_MASK_ATTR_RO(_name) \
 508         struct device_attribute arm_ccn_pmu_cmp_mask_attr_##_name = \
 509                         __ATTR(_name, S_IRUGO, arm_ccn_pmu_cmp_mask_show, NULL)
 510
 511 static CCN_CMP_MASK_ATTR(0l);
 512 static CCN_CMP_MASK_ATTR(0h);
 513 static CCN_CMP_MASK_ATTR(1l);
 514 static CCN_CMP_MASK_ATTR(1h);
 515 static CCN_CMP_MASK_ATTR(2l);
 516 static CCN_CMP_MASK_ATTR(2h);
 517 static CCN_CMP_MASK_ATTR(3l);
 518 static CCN_CMP_MASK_ATTR(3h);
 519 static CCN_CMP_MASK_ATTR(4l);
 520 static CCN_CMP_MASK_ATTR(4h);
 521 static CCN_CMP_MASK_ATTR(5l);
 522 static CCN_CMP_MASK_ATTR(5h);
 523 static CCN_CMP_MASK_ATTR(6l);
 524 static CCN_CMP_MASK_ATTR(6h);
 525 static CCN_CMP_MASK_ATTR(7l);
 526 static CCN_CMP_MASK_ATTR(7h);
 527 static CCN_CMP_MASK_ATTR_RO(8l);
 528 static CCN_CMP_MASK_ATTR_RO(8h);
 529 static CCN_CMP_MASK_ATTR_RO(9l);
 530 static CCN_CMP_MASK_ATTR_RO(9h);
 531 static CCN_CMP_MASK_ATTR_RO(al);
 532 static CCN_CMP_MASK_ATTR_RO(ah);
 533 static CCN_CMP_MASK_ATTR_RO(bl);
 534 static CCN_CMP_MASK_ATTR_RO(bh);
 535
 536 static struct attribute *arm_ccn_pmu_cmp_mask_attrs[] = {
 537         &arm_ccn_pmu_cmp_mask_attr_0l.attr, &arm_ccn_pmu_cmp_mask_attr_0h.attr,
 538         &arm_ccn_pmu_cmp_mask_attr_1l.attr, &arm_ccn_pmu_cmp_mask_attr_1h.attr,
 539         &arm_ccn_pmu_cmp_mask_attr_2l.attr, &arm_ccn_pmu_cmp_mask_attr_2h.attr,
 540         &arm_ccn_pmu_cmp_mask_attr_3l.attr, &arm_ccn_pmu_cmp_mask_attr_3h.attr,
 541         &arm_ccn_pmu_cmp_mask_attr_4l.attr, &arm_ccn_pmu_cmp_mask_attr_4h.attr,
 542         &arm_ccn_pmu_cmp_mask_attr_5l.attr, &arm_ccn_pmu_cmp_mask_attr_5h.attr,
 543         &arm_ccn_pmu_cmp_mask_attr_6l.attr, &arm_ccn_pmu_cmp_mask_attr_6h.attr,
 544         &arm_ccn_pmu_cmp_mask_attr_7l.attr, &arm_ccn_pmu_cmp_mask_attr_7h.attr,
 545         &arm_ccn_pmu_cmp_mask_attr_8l.attr, &arm_ccn_pmu_cmp_mask_attr_8h.attr,
 546         &arm_ccn_pmu_cmp_mask_attr_9l.attr, &arm_ccn_pmu_cmp_mask_attr_9h.attr,
 547         &arm_ccn_pmu_cmp_mask_attr_al.attr, &arm_ccn_pmu_cmp_mask_attr_ah.attr,
 548         &arm_ccn_pmu_cmp_mask_attr_bl.attr, &arm_ccn_pmu_cmp_mask_attr_bh.attr,
 549         NULL
 550 };
 551
 552 static const struct attribute_group arm_ccn_pmu_cmp_mask_attr_group = {
 553         .name = "cmp_mask",
 554         .attrs = arm_ccn_pmu_cmp_mask_attrs,
 555 };
 556
 557 static ssize_t arm_ccn_pmu_cpumask_show(struct device *dev,
 558                                      struct device_attribute *attr, char *buf)
 559 {
 560         struct arm_ccn *ccn = pmu_to_arm_ccn(dev_get_drvdata(dev));
 561
 562         return cpumap_print_to_pagebuf(true, buf, &ccn->dt.cpu);
 563 }
 564
 565 static struct device_attribute arm_ccn_pmu_cpumask_attr =
 566                 __ATTR(cpumask, S_IRUGO, arm_ccn_pmu_cpumask_show, NULL);
 567
 568 static struct attribute *arm_ccn_pmu_cpumask_attrs[] = {
 569         &arm_ccn_pmu_cpumask_attr.attr,
 570         NULL,
 571 };
 572
 573 static const struct attribute_group arm_ccn_pmu_cpumask_attr_group = {
 574         .attrs = arm_ccn_pmu_cpumask_attrs,
 575 };
 576
 577 /*
 578  * Default poll period is 10ms, which is way over the top anyway,
 579  * as in the worst case scenario (an event every cycle), with 1GHz
 580  * clocked bus, the smallest, 32 bit counter will overflow in
 581  * more than 4s.
 582  */
 583 static unsigned int arm_ccn_pmu_poll_period_us = 10000;
 584 module_param_named(pmu_poll_period_us, arm_ccn_pmu_poll_period_us, uint,
 585                 S_IRUGO | S_IWUSR);
 586
 587 static ktime_t arm_ccn_pmu_timer_period(void)
 588 {
 589         return ns_to_ktime((u64)arm_ccn_pmu_poll_period_us * 1000);
 590 }
 591
 592
 593 static const struct attribute_group *arm_ccn_pmu_attr_groups[] = {
 594         &arm_ccn_pmu_events_attr_group,
 595         &arm_ccn_pmu_format_attr_group,
 596         &arm_ccn_pmu_cmp_mask_attr_group,
 597         &arm_ccn_pmu_cpumask_attr_group,
 598         NULL
 599 };
 600
 601
 602 static int arm_ccn_pmu_alloc_bit(unsigned long *bitmap, unsigned long size)
 603 {
 604         int bit;
 605
 606         do {
 607                 bit = find_first_zero_bit(bitmap, size);
 608                 if (bit >= size)
 609                         return -EAGAIN;
 610         } while (test_and_set_bit(bit, bitmap));
 611
 612         return bit;
 613 }
 614
 615 /* All RN-I and RN-D nodes have identical PMUs */
 616 static int arm_ccn_pmu_type_eq(u32 a, u32 b)
 617 {
 618         if (a == b)
 619                 return 1;
 620
 621         switch (a) {
 622         case CCN_TYPE_RNI_1P:
 623         case CCN_TYPE_RNI_2P:
 624         case CCN_TYPE_RNI_3P:
 625         case CCN_TYPE_RND_1P:
 626         case CCN_TYPE_RND_2P:
 627         case CCN_TYPE_RND_3P:
 628                 switch (b) {
 629                 case CCN_TYPE_RNI_1P:
 630                 case CCN_TYPE_RNI_2P:
 631                 case CCN_TYPE_RNI_3P:
 632                 case CCN_TYPE_RND_1P:
 633                 case CCN_TYPE_RND_2P:
 634                 case CCN_TYPE_RND_3P:
 635                         return 1;
 636                 }
 637                 break;
 638         }
 639
 640         return 0;
 641 }
 642
 643 static int arm_ccn_pmu_event_alloc(struct perf_event *event)
 644 {
 645         struct arm_ccn *ccn = pmu_to_arm_ccn(event->pmu);
 646         struct hw_perf_event *hw = &event->hw;
 647         u32 node_xp, type, event_id;
 648         struct arm_ccn_component *source;
 649         int bit;
 650
 651         node_xp = CCN_CONFIG_NODE(event->attr.config);
 652         type = CCN_CONFIG_TYPE(event->attr.config);
 653         event_id = CCN_CONFIG_EVENT(event->attr.config);
 654
 655         /* Allocate the cycle counter */
 656         if (type == CCN_TYPE_CYCLES) {
 657                 if (test_and_set_bit(CCN_IDX_PMU_CYCLE_COUNTER,
 658                                 ccn->dt.pmu_counters_mask))
 659                         return -EAGAIN;
 660
 661                 hw->idx = CCN_IDX_PMU_CYCLE_COUNTER;
 662                 ccn->dt.pmu_counters[CCN_IDX_PMU_CYCLE_COUNTER].event = event;
 663
 664                 return 0;
 665         }
 666
 667         /* Allocate an event counter */
 668         hw->idx = arm_ccn_pmu_alloc_bit(ccn->dt.pmu_counters_mask,
 669                         CCN_NUM_PMU_EVENT_COUNTERS);
 670         if (hw->idx < 0) {
 671                 dev_dbg(ccn->dev, "No more counters available!\n");
 672                 return -EAGAIN;
 673         }
 674
 675         if (type == CCN_TYPE_XP)
 676                 source = &ccn->xp[node_xp];
 677         else
 678                 source = &ccn->node[node_xp];
 679         ccn->dt.pmu_counters[hw->idx].source = source;
 680
 681         /* Allocate an event source or a watchpoint */
 682         if (type == CCN_TYPE_XP && event_id == CCN_EVENT_WATCHPOINT)
 683                 bit = arm_ccn_pmu_alloc_bit(source->xp.dt_cmp_mask,
 684                                 CCN_NUM_XP_WATCHPOINTS);
 685         else
 686                 bit = arm_ccn_pmu_alloc_bit(source->pmu_events_mask,
 687                                 CCN_NUM_PMU_EVENTS);
 688         if (bit < 0) {
 689                 dev_dbg(ccn->dev, "No more event sources/watchpoints on node/XP %d!\n",
 690                                 node_xp);
 691                 clear_bit(hw->idx, ccn->dt.pmu_counters_mask);
 692                 return -EAGAIN;
 693         }
 694         hw->config_base = bit;
 695
 696         ccn->dt.pmu_counters[hw->idx].event = event;
 697
 698         return 0;
 699 }
 700
 701 static void arm_ccn_pmu_event_release(struct perf_event *event)
 702 {
 703         struct arm_ccn *ccn = pmu_to_arm_ccn(event->pmu);
 704         struct hw_perf_event *hw = &event->hw;
 705
 706         if (hw->idx == CCN_IDX_PMU_CYCLE_COUNTER) {
 707                 clear_bit(CCN_IDX_PMU_CYCLE_COUNTER, ccn->dt.pmu_counters_mask);
 708         } else {
 709                 struct arm_ccn_component *source =
 710                                 ccn->dt.pmu_counters[hw->idx].source;
 711
 712                 if (CCN_CONFIG_TYPE(event->attr.config) == CCN_TYPE_XP &&
 713                                 CCN_CONFIG_EVENT(event->attr.config) ==
 714                                 CCN_EVENT_WATCHPOINT)
 715                         clear_bit(hw->config_base, source->xp.dt_cmp_mask);
 716                 else
 717                         clear_bit(hw->config_base, source->pmu_events_mask);
 718                 clear_bit(hw->idx, ccn->dt.pmu_counters_mask);
 719         }
 720
 721         ccn->dt.pmu_counters[hw->idx].source = NULL;
 722         ccn->dt.pmu_counters[hw->idx].event = NULL;
 723 }
 724
 725 static int arm_ccn_pmu_event_init(struct perf_event *event)
 726 {
 727         struct arm_ccn *ccn;
 728         struct hw_perf_event *hw = &event->hw;
 729         u32 node_xp, type, event_id;
 730         int valid;
 731         int i;
 732         struct perf_event *sibling;
 733
 734         if (event->attr.type != event->pmu->type)
 735                 return -ENOENT;
 736
 737         ccn = pmu_to_arm_ccn(event->pmu);
 738
 739         if (hw->sample_period) {
 740                 dev_dbg(ccn->dev, "Sampling not supported!\n");
 741                 return -EOPNOTSUPP;
 742         }
 743
 744         if (has_branch_stack(event) || event->attr.exclude_user ||
 745                         event->attr.exclude_kernel || event->attr.exclude_hv ||
 746                         event->attr.exclude_idle || event->attr.exclude_host ||
 747                         event->attr.exclude_guest) {
 748                 dev_dbg(ccn->dev, "Can't exclude execution levels!\n");
 749                 return -EINVAL;
 750         }
 751
 752         if (event->cpu < 0) {
 753                 dev_dbg(ccn->dev, "Can't provide per-task data!\n");
 754                 return -EOPNOTSUPP;
 755         }
 756         /*
 757          * Many perf core operations (eg. events rotation) operate on a
 758          * single CPU context. This is obvious for CPU PMUs, where one
 759          * expects the same sets of events being observed on all CPUs,
 760          * but can lead to issues for off-core PMUs, like CCN, where each
 761          * event could be theoretically assigned to a different CPU. To
 762          * mitigate this, we enforce CPU assignment to one, selected
 763          * processor (the one described in the "cpumask" attribute).
 764          */
 765         event->cpu = cpumask_first(&ccn->dt.cpu);
 766
 767         node_xp = CCN_CONFIG_NODE(event->attr.config);
 768         type = CCN_CONFIG_TYPE(event->attr.config);
 769         event_id = CCN_CONFIG_EVENT(event->attr.config);
 770
 771         /* Validate node/xp vs topology */
 772         switch (type) {
 773         case CCN_TYPE_MN:
 774                 if (node_xp != ccn->mn_id) {
 775                         dev_dbg(ccn->dev, "Invalid MN ID %d!\n", node_xp);
 776                         return -EINVAL;
 777                 }
 778                 break;
 779         case CCN_TYPE_XP:
 780                 if (node_xp >= ccn->num_xps) {
 781                         dev_dbg(ccn->dev, "Invalid XP ID %d!\n", node_xp);
 782                         return -EINVAL;
 783                 }
 784                 break;
 785         case CCN_TYPE_CYCLES:
 786                 break;
 787         default:
 788                 if (node_xp >= ccn->num_nodes) {
 789                         dev_dbg(ccn->dev, "Invalid node ID %d!\n", node_xp);
 790                         return -EINVAL;
 791                 }
 792                 if (!arm_ccn_pmu_type_eq(type, ccn->node[node_xp].type)) {
 793                         dev_dbg(ccn->dev, "Invalid type 0x%x for node %d!\n",
 794                                         type, node_xp);
 795                         return -EINVAL;
 796                 }
 797                 break;
 798         }
 799
 800         /* Validate event ID vs available for the type */
 801         for (i = 0, valid = 0; i < ARRAY_SIZE(arm_ccn_pmu_events) && !valid;
 802                         i++) {
 803                 struct arm_ccn_pmu_event *e = &arm_ccn_pmu_events[i];
 804                 u32 port = CCN_CONFIG_PORT(event->attr.config);
 805                 u32 vc = CCN_CONFIG_VC(event->attr.config);
 806
 807                 if (!arm_ccn_pmu_type_eq(type, e->type))
 808                         continue;
 809                 if (event_id != e->event)
 810                         continue;
 811                 if (e->num_ports && port >= e->num_ports) {
 812                         dev_dbg(ccn->dev, "Invalid port %d for node/XP %d!\n",
 813                                         port, node_xp);
 814                         return -EINVAL;
 815                 }
 816                 if (e->num_vcs && vc >= e->num_vcs) {
 817                         dev_dbg(ccn->dev, "Invalid vc %d for node/XP %d!\n",
 818                                         vc, node_xp);
 819                         return -EINVAL;
 820                 }
 821                 valid = 1;
 822         }
 823         if (!valid) {
 824                 dev_dbg(ccn->dev, "Invalid event 0x%x for node/XP %d!\n",
 825                                 event_id, node_xp);
 826                 return -EINVAL;
 827         }
 828
 829         /* Watchpoint-based event for a node is actually set on XP */
 830         if (event_id == CCN_EVENT_WATCHPOINT && type != CCN_TYPE_XP) {
 831                 u32 port;
 832
 833                 type = CCN_TYPE_XP;
 834                 port = arm_ccn_node_to_xp_port(node_xp);
 835                 node_xp = arm_ccn_node_to_xp(node_xp);
 836
 837                 arm_ccn_pmu_config_set(&event->attr.config,
 838                                 node_xp, type, port);
 839         }
 840
 841         /*
 842          * We must NOT create groups containing mixed PMUs, although software
 843          * events are acceptable (for example to create a CCN group
 844          * periodically read when a hrtimer aka cpu-clock leader triggers).
 845          */
 846         if (event->group_leader->pmu != event->pmu &&
 847                         !is_software_event(event->group_leader))
 848                 return -EINVAL;
 849
 850         for_each_sibling_event(sibling, event->group_leader) {
 851                 if (sibling->pmu != event->pmu &&
 852                                 !is_software_event(sibling))
 853                         return -EINVAL;
 854         }
 855
 856         return 0;
 857 }
 858
 859 static u64 arm_ccn_pmu_read_counter(struct arm_ccn *ccn, int idx)
 860 {
 861         u64 res;
 862
 863         if (idx == CCN_IDX_PMU_CYCLE_COUNTER) {
 864 #ifdef readq
 865                 res = readq(ccn->dt.base + CCN_DT_PMCCNTR);
 866 #else
 867                 /* 40 bit counter, can do snapshot and read in two parts */
 868                 writel(0x1, ccn->dt.base + CCN_DT_PMSR_REQ);
 869                 while (!(readl(ccn->dt.base + CCN_DT_PMSR) & 0x1))
 870                         ;
 871                 writel(0x1, ccn->dt.base + CCN_DT_PMSR_CLR);
 872                 res = readl(ccn->dt.base + CCN_DT_PMCCNTRSR + 4) & 0xff;
 873                 res <<= 32;
 874                 res |= readl(ccn->dt.base + CCN_DT_PMCCNTRSR);
 875 #endif
 876         } else {
 877                 res = readl(ccn->dt.base + CCN_DT_PMEVCNT(idx));
 878         }
 879
 880         return res;
 881 }
 882
 883 static void arm_ccn_pmu_event_update(struct perf_event *event)
 884 {
 885         struct arm_ccn *ccn = pmu_to_arm_ccn(event->pmu);
 886         struct hw_perf_event *hw = &event->hw;
 887         u64 prev_count, new_count, mask;
 888
 889         do {
 890                 prev_count = local64_read(&hw->prev_count);
 891                 new_count = arm_ccn_pmu_read_counter(ccn, hw->idx);
 892         } while (local64_xchg(&hw->prev_count, new_count) != prev_count);
 893
 894         mask = (1LLU << (hw->idx == CCN_IDX_PMU_CYCLE_COUNTER ? 40 : 32)) - 1;
 895
 896         local64_add((new_count - prev_count) & mask, &event->count);
 897 }
 898
 899 static void arm_ccn_pmu_xp_dt_config(struct perf_event *event, int enable)
 900 {
 901         struct arm_ccn *ccn = pmu_to_arm_ccn(event->pmu);
 902         struct hw_perf_event *hw = &event->hw;
 903         struct arm_ccn_component *xp;
 904         u32 val, dt_cfg;
 905
 906         /* Nothing to do for cycle counter */
 907         if (hw->idx == CCN_IDX_PMU_CYCLE_COUNTER)
 908                 return;
 909
 910         if (CCN_CONFIG_TYPE(event->attr.config) == CCN_TYPE_XP)
 911                 xp = &ccn->xp[CCN_CONFIG_XP(event->attr.config)];
 912         else
 913                 xp = &ccn->xp[arm_ccn_node_to_xp(
 914                                 CCN_CONFIG_NODE(event->attr.config))];
 915
 916         if (enable)
 917                 dt_cfg = hw->event_base;
 918         else
 919                 dt_cfg = CCN_XP_DT_CONFIG__DT_CFG__PASS_THROUGH;
 920
 921         spin_lock(&ccn->dt.config_lock);
 922
 923         val = readl(xp->base + CCN_XP_DT_CONFIG);
 924         val &= ~(CCN_XP_DT_CONFIG__DT_CFG__MASK <<
 925                         CCN_XP_DT_CONFIG__DT_CFG__SHIFT(hw->idx));
 926         val |= dt_cfg << CCN_XP_DT_CONFIG__DT_CFG__SHIFT(hw->idx);
 927         writel(val, xp->base + CCN_XP_DT_CONFIG);
 928
 929         spin_unlock(&ccn->dt.config_lock);
 930 }
 931
 932 static void arm_ccn_pmu_event_start(struct perf_event *event, int flags)
 933 {
 934         struct arm_ccn *ccn = pmu_to_arm_ccn(event->pmu);
 935         struct hw_perf_event *hw = &event->hw;
 936
 937         local64_set(&event->hw.prev_count,
 938                         arm_ccn_pmu_read_counter(ccn, hw->idx));
 939         hw->state = 0;
 940
 941         /* Set the DT bus input, engaging the counter */
 942         arm_ccn_pmu_xp_dt_config(event, 1);
 943 }
 944
 945 static void arm_ccn_pmu_event_stop(struct perf_event *event, int flags)
 946 {
 947         struct hw_perf_event *hw = &event->hw;
 948
 949         /* Disable counting, setting the DT bus to pass-through mode */
 950         arm_ccn_pmu_xp_dt_config(event, 0);
 951
 952         if (flags & PERF_EF_UPDATE)
 953                 arm_ccn_pmu_event_update(event);
 954
 955         hw->state |= PERF_HES_STOPPED;
 956 }
 957
 958 static void arm_ccn_pmu_xp_watchpoint_config(struct perf_event *event)
 959 {
 960         struct arm_ccn *ccn = pmu_to_arm_ccn(event->pmu);
 961         struct hw_perf_event *hw = &event->hw;
 962         struct arm_ccn_component *source =
 963                         ccn->dt.pmu_counters[hw->idx].source;
 964         unsigned long wp = hw->config_base;
 965         u32 val;
 966         u64 cmp_l = event->attr.config1;
 967         u64 cmp_h = event->attr.config2;
 968         u64 mask_l = ccn->dt.cmp_mask[CCN_CONFIG_MASK(event->attr.config)].l;
 969         u64 mask_h = ccn->dt.cmp_mask[CCN_CONFIG_MASK(event->attr.config)].h;
 970
 971         hw->event_base = CCN_XP_DT_CONFIG__DT_CFG__WATCHPOINT(wp);
 972
 973         /* Direction (RX/TX), device (port) & virtual channel */
 974         val = readl(source->base + CCN_XP_DT_INTERFACE_SEL);
 975         val &= ~(CCN_XP_DT_INTERFACE_SEL__DT_IO_SEL__MASK <<
 976                         CCN_XP_DT_INTERFACE_SEL__DT_IO_SEL__SHIFT(wp));
 977         val |= CCN_CONFIG_DIR(event->attr.config) <<
 978                         CCN_XP_DT_INTERFACE_SEL__DT_IO_SEL__SHIFT(wp);
 979         val &= ~(CCN_XP_DT_INTERFACE_SEL__DT_DEV_SEL__MASK <<
 980                         CCN_XP_DT_INTERFACE_SEL__DT_DEV_SEL__SHIFT(wp));
 981         val |= CCN_CONFIG_PORT(event->attr.config) <<
 982                         CCN_XP_DT_INTERFACE_SEL__DT_DEV_SEL__SHIFT(wp);
 983         val &= ~(CCN_XP_DT_INTERFACE_SEL__DT_VC_SEL__MASK <<
 984                         CCN_XP_DT_INTERFACE_SEL__DT_VC_SEL__SHIFT(wp));
 985         val |= CCN_CONFIG_VC(event->attr.config) <<
 986                         CCN_XP_DT_INTERFACE_SEL__DT_VC_SEL__SHIFT(wp);
 987         writel(val, source->base + CCN_XP_DT_INTERFACE_SEL);
 988
 989         /* Comparison values */
 990         writel(cmp_l & 0xffffffff, source->base + CCN_XP_DT_CMP_VAL_L(wp));
 991         writel((cmp_l >> 32) & 0x7fffffff,
 992                         source->base + CCN_XP_DT_CMP_VAL_L(wp) + 4);
 993         writel(cmp_h & 0xffffffff, source->base + CCN_XP_DT_CMP_VAL_H(wp));
 994         writel((cmp_h >> 32) & 0x0fffffff,
 995                         source->base + CCN_XP_DT_CMP_VAL_H(wp) + 4);
 996
 997         /* Mask */
 998         writel(mask_l & 0xffffffff, source->base + CCN_XP_DT_CMP_MASK_L(wp));
 999         writel((mask_l >> 32) & 0x7fffffff,
1000                         source->base + CCN_XP_DT_CMP_MASK_L(wp) + 4);
1001         writel(mask_h & 0xffffffff, source->base + CCN_XP_DT_CMP_MASK_H(wp));
1002         writel((mask_h >> 32) & 0x0fffffff,
1003                         source->base + CCN_XP_DT_CMP_MASK_H(wp) + 4);
1004 }
1005
1006 static void arm_ccn_pmu_xp_event_config(struct perf_event *event)
1007 {
1008         struct arm_ccn *ccn = pmu_to_arm_ccn(event->pmu);
1009         struct hw_perf_event *hw = &event->hw;
1010         struct arm_ccn_component *source =
1011                         ccn->dt.pmu_counters[hw->idx].source;
1012         u32 val, id;
1013
1014         hw->event_base = CCN_XP_DT_CONFIG__DT_CFG__XP_PMU_EVENT(hw->config_base);
1015
1016         id = (CCN_CONFIG_VC(event->attr.config) << 4) |
1017                         (CCN_CONFIG_BUS(event->attr.config) << 3) |
1018                         (CCN_CONFIG_EVENT(event->attr.config) << 0);
1019
1020         val = readl(source->base + CCN_XP_PMU_EVENT_SEL);
1021         val &= ~(CCN_XP_PMU_EVENT_SEL__ID__MASK <<
1022                         CCN_XP_PMU_EVENT_SEL__ID__SHIFT(hw->config_base));
1023         val |= id << CCN_XP_PMU_EVENT_SEL__ID__SHIFT(hw->config_base);
1024         writel(val, source->base + CCN_XP_PMU_EVENT_SEL);
1025 }
1026
1027 static void arm_ccn_pmu_node_event_config(struct perf_event *event)
1028 {
1029         struct arm_ccn *ccn = pmu_to_arm_ccn(event->pmu);
1030         struct hw_perf_event *hw = &event->hw;
1031         struct arm_ccn_component *source =
1032                         ccn->dt.pmu_counters[hw->idx].source;
1033         u32 type = CCN_CONFIG_TYPE(event->attr.config);
1034         u32 val, port;
1035
1036         port = arm_ccn_node_to_xp_port(CCN_CONFIG_NODE(event->attr.config));
1037         hw->event_base = CCN_XP_DT_CONFIG__DT_CFG__DEVICE_PMU_EVENT(port,
1038                         hw->config_base);
1039
1040         /* These *_event_sel regs should be identical, but let's make sure... */
1041         BUILD_BUG_ON(CCN_HNF_PMU_EVENT_SEL != CCN_SBAS_PMU_EVENT_SEL);
1042         BUILD_BUG_ON(CCN_SBAS_PMU_EVENT_SEL != CCN_RNI_PMU_EVENT_SEL);
1043         BUILD_BUG_ON(CCN_HNF_PMU_EVENT_SEL__ID__SHIFT(1) !=
1044                         CCN_SBAS_PMU_EVENT_SEL__ID__SHIFT(1));
1045         BUILD_BUG_ON(CCN_SBAS_PMU_EVENT_SEL__ID__SHIFT(1) !=
1046                         CCN_RNI_PMU_EVENT_SEL__ID__SHIFT(1));
1047         BUILD_BUG_ON(CCN_HNF_PMU_EVENT_SEL__ID__MASK !=
1048                         CCN_SBAS_PMU_EVENT_SEL__ID__MASK);
1049         BUILD_BUG_ON(CCN_SBAS_PMU_EVENT_SEL__ID__MASK !=
1050                         CCN_RNI_PMU_EVENT_SEL__ID__MASK);
1051         if (WARN_ON(type != CCN_TYPE_HNF && type != CCN_TYPE_SBAS &&
1052                         !arm_ccn_pmu_type_eq(type, CCN_TYPE_RNI_3P)))
1053                 return;
1054
1055         /* Set the event id for the pre-allocated counter */
1056         val = readl(source->base + CCN_HNF_PMU_EVENT_SEL);
1057         val &= ~(CCN_HNF_PMU_EVENT_SEL__ID__MASK <<
1058                 CCN_HNF_PMU_EVENT_SEL__ID__SHIFT(hw->config_base));
1059         val |= CCN_CONFIG_EVENT(event->attr.config) <<
1060                 CCN_HNF_PMU_EVENT_SEL__ID__SHIFT(hw->config_base);
1061         writel(val, source->base + CCN_HNF_PMU_EVENT_SEL);
1062 }
1063
1064 static void arm_ccn_pmu_event_config(struct perf_event *event)
1065 {
1066         struct arm_ccn *ccn = pmu_to_arm_ccn(event->pmu);
1067         struct hw_perf_event *hw = &event->hw;
1068         u32 xp, offset, val;
1069
1070         /* Cycle counter requires no setup */
1071         if (hw->idx == CCN_IDX_PMU_CYCLE_COUNTER)
1072                 return;
1073
1074         if (CCN_CONFIG_TYPE(event->attr.config) == CCN_TYPE_XP)
1075                 xp = CCN_CONFIG_XP(event->attr.config);
1076         else
1077                 xp = arm_ccn_node_to_xp(CCN_CONFIG_NODE(event->attr.config));
1078
1079         spin_lock(&ccn->dt.config_lock);
1080
1081         /* Set the DT bus "distance" register */
1082         offset = (hw->idx / 4) * 4;
1083         val = readl(ccn->dt.base + CCN_DT_ACTIVE_DSM + offset);
1084         val &= ~(CCN_DT_ACTIVE_DSM__DSM_ID__MASK <<
1085                         CCN_DT_ACTIVE_DSM__DSM_ID__SHIFT(hw->idx % 4));
1086         val |= xp << CCN_DT_ACTIVE_DSM__DSM_ID__SHIFT(hw->idx % 4);
1087         writel(val, ccn->dt.base + CCN_DT_ACTIVE_DSM + offset);
1088
1089         if (CCN_CONFIG_TYPE(event->attr.config) == CCN_TYPE_XP) {
1090                 if (CCN_CONFIG_EVENT(event->attr.config) ==
1091                                 CCN_EVENT_WATCHPOINT)
1092                         arm_ccn_pmu_xp_watchpoint_config(event);
1093                 else
1094                         arm_ccn_pmu_xp_event_config(event);
1095         } else {
1096                 arm_ccn_pmu_node_event_config(event);
1097         }
1098
1099         spin_unlock(&ccn->dt.config_lock);
1100 }
1101
1102 static int arm_ccn_pmu_active_counters(struct arm_ccn *ccn)
1103 {
1104         return bitmap_weight(ccn->dt.pmu_counters_mask,
1105                              CCN_NUM_PMU_EVENT_COUNTERS + 1);
1106 }
1107
1108 static int arm_ccn_pmu_event_add(struct perf_event *event, int flags)
1109 {
1110         int err;
1111         struct hw_perf_event *hw = &event->hw;
1112         struct arm_ccn *ccn = pmu_to_arm_ccn(event->pmu);
1113
1114         err = arm_ccn_pmu_event_alloc(event);
1115         if (err)
1116                 return err;
1117
1118         /*
1119          * Pin the timer, so that the overflows are handled by the chosen
1120          * event->cpu (this is the same one as presented in "cpumask"
1121          * attribute).
1122          */
1123         if (!ccn->irq && arm_ccn_pmu_active_counters(ccn) == 1)
1124                 hrtimer_start(&ccn->dt.hrtimer, arm_ccn_pmu_timer_period(),
1125                               HRTIMER_MODE_REL_PINNED);
1126
1127         arm_ccn_pmu_event_config(event);
1128
1129         hw->state = PERF_HES_STOPPED;
1130
1131         if (flags & PERF_EF_START)
1132                 arm_ccn_pmu_event_start(event, PERF_EF_UPDATE);
1133
1134         return 0;
1135 }
1136
1137 static void arm_ccn_pmu_event_del(struct perf_event *event, int flags)
1138 {
1139         struct arm_ccn *ccn = pmu_to_arm_ccn(event->pmu);
1140
1141         arm_ccn_pmu_event_stop(event, PERF_EF_UPDATE);
1142
1143         arm_ccn_pmu_event_release(event);
1144
1145         if (!ccn->irq && arm_ccn_pmu_active_counters(ccn) == 0)
1146                 hrtimer_cancel(&ccn->dt.hrtimer);
1147 }
1148
1149 static void arm_ccn_pmu_event_read(struct perf_event *event)
1150 {
1151         arm_ccn_pmu_event_update(event);
1152 }
1153
1154 static void arm_ccn_pmu_enable(struct pmu *pmu)
1155 {
1156         struct arm_ccn *ccn = pmu_to_arm_ccn(pmu);
1157
1158         u32 val = readl(ccn->dt.base + CCN_DT_PMCR);
1159         val |= CCN_DT_PMCR__PMU_EN;
1160         writel(val, ccn->dt.base + CCN_DT_PMCR);
1161 }
1162
1163 static void arm_ccn_pmu_disable(struct pmu *pmu)
1164 {
1165         struct arm_ccn *ccn = pmu_to_arm_ccn(pmu);
1166
1167         u32 val = readl(ccn->dt.base + CCN_DT_PMCR);
1168         val &= ~CCN_DT_PMCR__PMU_EN;
1169         writel(val, ccn->dt.base + CCN_DT_PMCR);
1170 }
1171
1172 static irqreturn_t arm_ccn_pmu_overflow_handler(struct arm_ccn_dt *dt)
1173 {
1174         u32 pmovsr = readl(dt->base + CCN_DT_PMOVSR);
1175         int idx;
1176
1177         if (!pmovsr)
1178                 return IRQ_NONE;
1179
1180         writel(pmovsr, dt->base + CCN_DT_PMOVSR_CLR);
1181
1182         BUILD_BUG_ON(CCN_IDX_PMU_CYCLE_COUNTER != CCN_NUM_PMU_EVENT_COUNTERS);
1183
1184         for (idx = 0; idx < CCN_NUM_PMU_EVENT_COUNTERS + 1; idx++) {
1185                 struct perf_event *event = dt->pmu_counters[idx].event;
1186                 int overflowed = pmovsr & BIT(idx);
1187
1188                 WARN_ON_ONCE(overflowed && !event &&
1189                                 idx != CCN_IDX_PMU_CYCLE_COUNTER);
1190
1191                 if (!event || !overflowed)
1192                         continue;
1193
1194                 arm_ccn_pmu_event_update(event);
1195         }
1196
1197         return IRQ_HANDLED;
1198 }
1199
1200 static enum hrtimer_restart arm_ccn_pmu_timer_handler(struct hrtimer *hrtimer)
1201 {
1202         struct arm_ccn_dt *dt = container_of(hrtimer, struct arm_ccn_dt,
1203                         hrtimer);
1204         unsigned long flags;
1205
1206         local_irq_save(flags);
1207         arm_ccn_pmu_overflow_handler(dt);
1208         local_irq_restore(flags);
1209
1210         hrtimer_forward_now(hrtimer, arm_ccn_pmu_timer_period());
1211         return HRTIMER_RESTART;
1212 }
1213
1214
1215 static int arm_ccn_pmu_offline_cpu(unsigned int cpu, struct hlist_node *node)
1216 {
1217         struct arm_ccn_dt *dt = hlist_entry_safe(node, struct arm_ccn_dt, node);
1218         struct arm_ccn *ccn = container_of(dt, struct arm_ccn, dt);
1219         unsigned int target;
1220
1221         if (!cpumask_test_and_clear_cpu(cpu, &dt->cpu))
1222                 return 0;
1223         target = cpumask_any_but(cpu_online_mask, cpu);
1224         if (target >= nr_cpu_ids)
1225                 return 0;
1226         perf_pmu_migrate_context(&dt->pmu, cpu, target);
1227         cpumask_set_cpu(target, &dt->cpu);
1228         if (ccn->irq)
1229                 WARN_ON(irq_set_affinity_hint(ccn->irq, &dt->cpu) != 0);
1230         return 0;
1231 }
1232
1233 static DEFINE_IDA(arm_ccn_pmu_ida);
1234
1235 static int arm_ccn_pmu_init(struct arm_ccn *ccn)
1236 {
1237         int i;
1238         char *name;
1239         int err;
1240
1241         /* Initialize DT subsystem */
1242         ccn->dt.base = ccn->base + CCN_REGION_SIZE;
1243         spin_lock_init(&ccn->dt.config_lock);
1244         writel(CCN_DT_PMOVSR_CLR__MASK, ccn->dt.base + CCN_DT_PMOVSR_CLR);
1245         writel(CCN_DT_CTL__DT_EN, ccn->dt.base + CCN_DT_CTL);
1246         writel(CCN_DT_PMCR__OVFL_INTR_EN | CCN_DT_PMCR__PMU_EN,
1247                         ccn->dt.base + CCN_DT_PMCR);
1248         writel(0x1, ccn->dt.base + CCN_DT_PMSR_CLR);
1249         for (i = 0; i < ccn->num_xps; i++) {
1250                 writel(0, ccn->xp[i].base + CCN_XP_DT_CONFIG);
1251                 writel((CCN_XP_DT_CONTROL__WP_ARM_SEL__ALWAYS <<
1252                                 CCN_XP_DT_CONTROL__WP_ARM_SEL__SHIFT(0)) |
1253                                 (CCN_XP_DT_CONTROL__WP_ARM_SEL__ALWAYS <<
1254                                 CCN_XP_DT_CONTROL__WP_ARM_SEL__SHIFT(1)) |
1255                                 CCN_XP_DT_CONTROL__DT_ENABLE,
1256                                 ccn->xp[i].base + CCN_XP_DT_CONTROL);
1257         }
1258         ccn->dt.cmp_mask[CCN_IDX_MASK_ANY].l = ~0;
1259         ccn->dt.cmp_mask[CCN_IDX_MASK_ANY].h = ~0;
1260         ccn->dt.cmp_mask[CCN_IDX_MASK_EXACT].l = 0;
1261         ccn->dt.cmp_mask[CCN_IDX_MASK_EXACT].h = 0;
1262         ccn->dt.cmp_mask[CCN_IDX_MASK_ORDER].l = ~0;
1263         ccn->dt.cmp_mask[CCN_IDX_MASK_ORDER].h = ~(0x1 << 15);
1264         ccn->dt.cmp_mask[CCN_IDX_MASK_OPCODE].l = ~0;
1265         ccn->dt.cmp_mask[CCN_IDX_MASK_OPCODE].h = ~(0x1f << 9);
1266
1267         /* Get a convenient /sys/event_source/devices/ name */
1268         ccn->dt.id = ida_simple_get(&arm_ccn_pmu_ida, 0, 0, GFP_KERNEL);
1269         if (ccn->dt.id == 0) {
1270                 name = "ccn";
1271         } else {
1272                 name = devm_kasprintf(ccn->dev, GFP_KERNEL, "ccn_%d",
1273                                       ccn->dt.id);
1274                 if (!name) {
1275                         err = -ENOMEM;
1276                         goto error_choose_name;
1277                 }
1278         }
1279
1280         /* Perf driver registration */
1281         ccn->dt.pmu = (struct pmu) {
1282                 .module = THIS_MODULE,
1283                 .attr_groups = arm_ccn_pmu_attr_groups,
1284                 .task_ctx_nr = perf_invalid_context,
1285                 .event_init = arm_ccn_pmu_event_init,
1286                 .add = arm_ccn_pmu_event_add,
1287                 .del = arm_ccn_pmu_event_del,
1288                 .start = arm_ccn_pmu_event_start,
1289                 .stop = arm_ccn_pmu_event_stop,
1290                 .read = arm_ccn_pmu_event_read,
1291                 .pmu_enable = arm_ccn_pmu_enable,
1292                 .pmu_disable = arm_ccn_pmu_disable,
1293         };
1294
1295         /* No overflow interrupt? Have to use a timer instead. */
1296         if (!ccn->irq) {
1297                 dev_info(ccn->dev, "No access to interrupts, using timer.\n");
1298                 hrtimer_init(&ccn->dt.hrtimer, CLOCK_MONOTONIC,
1299                                 HRTIMER_MODE_REL);
1300                 ccn->dt.hrtimer.function = arm_ccn_pmu_timer_handler;
1301         }
1302
1303         /* Pick one CPU which we will use to collect data from CCN... */
1304         cpumask_set_cpu(get_cpu(), &ccn->dt.cpu);
1305
1306         /* Also make sure that the overflow interrupt is handled by this CPU */
1307         if (ccn->irq) {
1308                 err = irq_set_affinity_hint(ccn->irq, &ccn->dt.cpu);
1309                 if (err) {
1310                         dev_err(ccn->dev, "Failed to set interrupt affinity!\n");
1311                         goto error_set_affinity;
1312                 }
1313         }
1314
1315         err = perf_pmu_register(&ccn->dt.pmu, name, -1);
1316         if (err)
1317                 goto error_pmu_register;
1318
1319         cpuhp_state_add_instance_nocalls(CPUHP_AP_PERF_ARM_CCN_ONLINE,
1320                                          &ccn->dt.node);
1321         put_cpu();
1322         return 0;
1323
1324 error_pmu_register:
1325 error_set_affinity:
1326         put_cpu();
1327 error_choose_name:
1328         ida_simple_remove(&arm_ccn_pmu_ida, ccn->dt.id);
1329         for (i = 0; i < ccn->num_xps; i++)
1330                 writel(0, ccn->xp[i].base + CCN_XP_DT_CONTROL);
1331         writel(0, ccn->dt.base + CCN_DT_PMCR);
1332         return err;
1333 }
1334
1335 static void arm_ccn_pmu_cleanup(struct arm_ccn *ccn)
1336 {
1337         int i;
1338
1339         cpuhp_state_remove_instance_nocalls(CPUHP_AP_PERF_ARM_CCN_ONLINE,
1340                                             &ccn->dt.node);
1341         if (ccn->irq)
1342                 irq_set_affinity_hint(ccn->irq, NULL);
1343         for (i = 0; i < ccn->num_xps; i++)
1344                 writel(0, ccn->xp[i].base + CCN_XP_DT_CONTROL);
1345         writel(0, ccn->dt.base + CCN_DT_PMCR);
1346         perf_pmu_unregister(&ccn->dt.pmu);
1347         ida_simple_remove(&arm_ccn_pmu_ida, ccn->dt.id);
1348 }
1349
1350 static int arm_ccn_for_each_valid_region(struct arm_ccn *ccn,
1351                 int (*callback)(struct arm_ccn *ccn, int region,
1352                 void __iomem *base, u32 type, u32 id))
1353 {
1354         int region;
1355
1356         for (region = 0; region < CCN_NUM_REGIONS; region++) {
1357                 u32 val, type, id;
1358                 void __iomem *base;
1359                 int err;
1360
1361                 val = readl(ccn->base + CCN_MN_OLY_COMP_LIST_63_0 +
1362                                 4 * (region / 32));
1363                 if (!(val & (1 << (region % 32))))
1364                         continue;
1365
1366                 base = ccn->base + region * CCN_REGION_SIZE;
1367                 val = readl(base + CCN_ALL_OLY_ID);
1368                 type = (val >> CCN_ALL_OLY_ID__OLY_ID__SHIFT) &
1369                                 CCN_ALL_OLY_ID__OLY_ID__MASK;
1370                 id = (val >> CCN_ALL_OLY_ID__NODE_ID__SHIFT) &
1371                                 CCN_ALL_OLY_ID__NODE_ID__MASK;
1372
1373                 err = callback(ccn, region, base, type, id);
1374                 if (err)
1375                         return err;
1376         }
1377
1378         return 0;
1379 }
1380
1381 static int arm_ccn_get_nodes_num(struct arm_ccn *ccn, int region,
1382                 void __iomem *base, u32 type, u32 id)
1383 {
1384
1385         if (type == CCN_TYPE_XP && id >= ccn->num_xps)
1386                 ccn->num_xps = id + 1;
1387         else if (id >= ccn->num_nodes)
1388                 ccn->num_nodes = id + 1;
1389
1390         return 0;
1391 }
1392
1393 static int arm_ccn_init_nodes(struct arm_ccn *ccn, int region,
1394                 void __iomem *base, u32 type, u32 id)
1395 {
1396         struct arm_ccn_component *component;
1397
1398         dev_dbg(ccn->dev, "Region %d: id=%u, type=0x%02x\n", region, id, type);
1399
1400         switch (type) {
1401         case CCN_TYPE_MN:
1402                 ccn->mn_id = id;
1403                 return 0;
1404         case CCN_TYPE_DT:
1405                 return 0;
1406         case CCN_TYPE_XP:
1407                 component = &ccn->xp[id];
1408                 break;
1409         case CCN_TYPE_SBSX:
1410                 ccn->sbsx_present = 1;
1411                 component = &ccn->node[id];
1412                 break;
1413         case CCN_TYPE_SBAS:
1414                 ccn->sbas_present = 1;
1415                 /* Fall-through */
1416         default:
1417                 component = &ccn->node[id];
1418                 break;
1419         }
1420
1421         component->base = base;
1422         component->type = type;
1423
1424         return 0;
1425 }
1426
1427
1428 static irqreturn_t arm_ccn_error_handler(struct arm_ccn *ccn,
1429                 const u32 *err_sig_val)
1430 {
1431         /* This should be really handled by firmware... */
1432         dev_err(ccn->dev, "Error reported in %08x%08x%08x%08x%08x%08x.\n",
1433                         err_sig_val[5], err_sig_val[4], err_sig_val[3],
1434                         err_sig_val[2], err_sig_val[1], err_sig_val[0]);
1435         dev_err(ccn->dev, "Disabling interrupt generation for all errors.\n");
1436         writel(CCN_MN_ERRINT_STATUS__ALL_ERRORS__DISABLE,
1437                         ccn->base + CCN_MN_ERRINT_STATUS);
1438
1439         return IRQ_HANDLED;
1440 }
1441
1442
1443 static irqreturn_t arm_ccn_irq_handler(int irq, void *dev_id)
1444 {
1445         irqreturn_t res = IRQ_NONE;
1446         struct arm_ccn *ccn = dev_id;
1447         u32 err_sig_val[6];
1448         u32 err_or;
1449         int i;
1450
1451         /* PMU overflow is a special case */
1452         err_or = err_sig_val[0] = readl(ccn->base + CCN_MN_ERR_SIG_VAL_63_0);
1453         if (err_or & CCN_MN_ERR_SIG_VAL_63_0__DT) {
1454                 err_or &= ~CCN_MN_ERR_SIG_VAL_63_0__DT;
1455                 res = arm_ccn_pmu_overflow_handler(&ccn->dt);
1456         }
1457
1458         /* Have to read all err_sig_vals to clear them */
1459         for (i = 1; i < ARRAY_SIZE(err_sig_val); i++) {
1460                 err_sig_val[i] = readl(ccn->base +
1461                                 CCN_MN_ERR_SIG_VAL_63_0 + i * 4);
1462                 err_or |= err_sig_val[i];
1463         }
1464         if (err_or)
1465                 res |= arm_ccn_error_handler(ccn, err_sig_val);
1466
1467         if (res != IRQ_NONE)
1468                 writel(CCN_MN_ERRINT_STATUS__INTREQ__DESSERT,
1469                                 ccn->base + CCN_MN_ERRINT_STATUS);
1470
1471         return res;
1472 }
1473
1474
1475 static int arm_ccn_probe(struct platform_device *pdev)
1476 {
1477         struct arm_ccn *ccn;
1478         struct resource *res;
1479         unsigned int irq;
1480         int err;
1481
1482         ccn = devm_kzalloc(&pdev->dev, sizeof(*ccn), GFP_KERNEL);
1483         if (!ccn)
1484                 return -ENOMEM;
1485         ccn->dev = &pdev->dev;
1486         platform_set_drvdata(pdev, ccn);
1487
1488         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1489         ccn->base = devm_ioremap_resource(ccn->dev, res);
1490         if (IS_ERR(ccn->base))
1491                 return PTR_ERR(ccn->base);
1492
1493         res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
1494         if (!res)
1495                 return -EINVAL;
1496         irq = res->start;
1497
1498         /* Check if we can use the interrupt */
1499         writel(CCN_MN_ERRINT_STATUS__PMU_EVENTS__DISABLE,
1500                         ccn->base + CCN_MN_ERRINT_STATUS);
1501         if (readl(ccn->base + CCN_MN_ERRINT_STATUS) &
1502                         CCN_MN_ERRINT_STATUS__PMU_EVENTS__DISABLED) {
1503                 /* Can set 'disable' bits, so can acknowledge interrupts */
1504                 writel(CCN_MN_ERRINT_STATUS__PMU_EVENTS__ENABLE,
1505                                 ccn->base + CCN_MN_ERRINT_STATUS);
1506                 err = devm_request_irq(ccn->dev, irq, arm_ccn_irq_handler,
1507                                        IRQF_NOBALANCING | IRQF_NO_THREAD,
1508                                        dev_name(ccn->dev), ccn);
1509                 if (err)
1510                         return err;
1511
1512                 ccn->irq = irq;
1513         }
1514
1515
1516         /* Build topology */
1517
1518         err = arm_ccn_for_each_valid_region(ccn, arm_ccn_get_nodes_num);
1519         if (err)
1520                 return err;
1521
1522         ccn->node = devm_kcalloc(ccn->dev, ccn->num_nodes, sizeof(*ccn->node),
1523                                  GFP_KERNEL);
1524         ccn->xp = devm_kcalloc(ccn->dev, ccn->num_xps, sizeof(*ccn->node),
1525                                GFP_KERNEL);
1526         if (!ccn->node || !ccn->xp)
1527                 return -ENOMEM;
1528
1529         err = arm_ccn_for_each_valid_region(ccn, arm_ccn_init_nodes);
1530         if (err)
1531                 return err;
1532
1533         return arm_ccn_pmu_init(ccn);
1534 }
1535
1536 static int arm_ccn_remove(struct platform_device *pdev)
1537 {
1538         struct arm_ccn *ccn = platform_get_drvdata(pdev);
1539
1540         arm_ccn_pmu_cleanup(ccn);
1541
1542         return 0;
1543 }
1544
1545 static const struct of_device_id arm_ccn_match[] = {
1546         { .compatible = "arm,ccn-502", },
1547         { .compatible = "arm,ccn-504", },
1548         {},
1549 };
1550 MODULE_DEVICE_TABLE(of, arm_ccn_match);
1551
1552 static struct platform_driver arm_ccn_driver = {
1553         .driver = {
1554                 .name = "arm-ccn",
1555                 .of_match_table = arm_ccn_match,
1556         },
1557         .probe = arm_ccn_probe,
1558         .remove = arm_ccn_remove,
1559 };
1560
1561 static int __init arm_ccn_init(void)
1562 {
1563         int i, ret;
1564
1565         ret = cpuhp_setup_state_multi(CPUHP_AP_PERF_ARM_CCN_ONLINE,
1566                                       "perf/arm/ccn:online", NULL,
1567                                       arm_ccn_pmu_offline_cpu);
1568         if (ret)
1569                 return ret;
1570
1571         for (i = 0; i < ARRAY_SIZE(arm_ccn_pmu_events); i++)
1572                 arm_ccn_pmu_events_attrs[i] = &arm_ccn_pmu_events[i].attr.attr;
1573
1574         ret = platform_driver_register(&arm_ccn_driver);
1575         if (ret)
1576                 cpuhp_remove_multi_state(CPUHP_AP_PERF_ARM_CCN_ONLINE);
1577         return ret;
1578 }
1579
1580 static void __exit arm_ccn_exit(void)
1581 {
1582         platform_driver_unregister(&arm_ccn_driver);
1583         cpuhp_remove_multi_state(CPUHP_AP_PERF_ARM_CCN_ONLINE);
1584 }
1585
1586 module_init(arm_ccn_init);
1587 module_exit(arm_ccn_exit);
1588
1589 MODULE_AUTHOR("Pawel Moll <pawel.moll@arm.com>");
1590 MODULE_LICENSE("GPL v2");