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