arch/mips/kernel/mips-cm.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Copyright (C) 2013 Imagination Technologies
   4  * Author: Paul Burton <paul.burton@mips.com>
   5  */
   6
   7 #include <linux/errno.h>
   8 #include <linux/percpu.h>
   9 #include <linux/spinlock.h>
  10
  11 #include <asm/mips-cps.h>
  12 #include <asm/mipsregs.h>
  13
  14 void __iomem *mips_gcr_base;
  15 void __iomem *mips_cm_l2sync_base;
  16 int mips_cm_is64;
  17
  18 static char *cm2_tr[8] = {
  19         "mem",  "gcr",  "gic",  "mmio",
  20         "0x04", "cpc", "0x06", "0x07"
  21 };
  22
  23 /* CM3 Tag ECC transaction type */
  24 static char *cm3_tr[16] = {
  25         [0x0] = "ReqNoData",
  26         [0x1] = "0x1",
  27         [0x2] = "ReqWData",
  28         [0x3] = "0x3",
  29         [0x4] = "IReqNoResp",
  30         [0x5] = "IReqWResp",
  31         [0x6] = "IReqNoRespDat",
  32         [0x7] = "IReqWRespDat",
  33         [0x8] = "RespNoData",
  34         [0x9] = "RespDataFol",
  35         [0xa] = "RespWData",
  36         [0xb] = "RespDataOnly",
  37         [0xc] = "IRespNoData",
  38         [0xd] = "IRespDataFol",
  39         [0xe] = "IRespWData",
  40         [0xf] = "IRespDataOnly"
  41 };
  42
  43 static char *cm2_cmd[32] = {
  44         [0x00] = "0x00",
  45         [0x01] = "Legacy Write",
  46         [0x02] = "Legacy Read",
  47         [0x03] = "0x03",
  48         [0x04] = "0x04",
  49         [0x05] = "0x05",
  50         [0x06] = "0x06",
  51         [0x07] = "0x07",
  52         [0x08] = "Coherent Read Own",
  53         [0x09] = "Coherent Read Share",
  54         [0x0a] = "Coherent Read Discard",
  55         [0x0b] = "Coherent Ready Share Always",
  56         [0x0c] = "Coherent Upgrade",
  57         [0x0d] = "Coherent Writeback",
  58         [0x0e] = "0x0e",
  59         [0x0f] = "0x0f",
  60         [0x10] = "Coherent Copyback",
  61         [0x11] = "Coherent Copyback Invalidate",
  62         [0x12] = "Coherent Invalidate",
  63         [0x13] = "Coherent Write Invalidate",
  64         [0x14] = "Coherent Completion Sync",
  65         [0x15] = "0x15",
  66         [0x16] = "0x16",
  67         [0x17] = "0x17",
  68         [0x18] = "0x18",
  69         [0x19] = "0x19",
  70         [0x1a] = "0x1a",
  71         [0x1b] = "0x1b",
  72         [0x1c] = "0x1c",
  73         [0x1d] = "0x1d",
  74         [0x1e] = "0x1e",
  75         [0x1f] = "0x1f"
  76 };
  77
  78 /* CM3 Tag ECC command type */
  79 static char *cm3_cmd[16] = {
  80         [0x0] = "Legacy Read",
  81         [0x1] = "Legacy Write",
  82         [0x2] = "Coherent Read Own",
  83         [0x3] = "Coherent Read Share",
  84         [0x4] = "Coherent Read Discard",
  85         [0x5] = "Coherent Evicted",
  86         [0x6] = "Coherent Upgrade",
  87         [0x7] = "Coherent Upgrade for Store Conditional",
  88         [0x8] = "Coherent Writeback",
  89         [0x9] = "Coherent Write Invalidate",
  90         [0xa] = "0xa",
  91         [0xb] = "0xb",
  92         [0xc] = "0xc",
  93         [0xd] = "0xd",
  94         [0xe] = "0xe",
  95         [0xf] = "0xf"
  96 };
  97
  98 /* CM3 Tag ECC command group */
  99 static char *cm3_cmd_group[8] = {
 100         [0x0] = "Normal",
 101         [0x1] = "Registers",
 102         [0x2] = "TLB",
 103         [0x3] = "0x3",
 104         [0x4] = "L1I",
 105         [0x5] = "L1D",
 106         [0x6] = "L3",
 107         [0x7] = "L2"
 108 };
 109
 110 static char *cm2_core[8] = {
 111         "Invalid/OK",   "Invalid/Data",
 112         "Shared/OK",    "Shared/Data",
 113         "Modified/OK",  "Modified/Data",
 114         "Exclusive/OK", "Exclusive/Data"
 115 };
 116
 117 static char *cm2_causes[32] = {
 118         "None", "GC_WR_ERR", "GC_RD_ERR", "COH_WR_ERR",
 119         "COH_RD_ERR", "MMIO_WR_ERR", "MMIO_RD_ERR", "0x07",
 120         "0x08", "0x09", "0x0a", "0x0b",
 121         "0x0c", "0x0d", "0x0e", "0x0f",
 122         "0x10", "0x11", "0x12", "0x13",
 123         "0x14", "0x15", "0x16", "INTVN_WR_ERR",
 124         "INTVN_RD_ERR", "0x19", "0x1a", "0x1b",
 125         "0x1c", "0x1d", "0x1e", "0x1f"
 126 };
 127
 128 static char *cm3_causes[32] = {
 129         "0x0", "MP_CORRECTABLE_ECC_ERR", "MP_REQUEST_DECODE_ERR",
 130         "MP_UNCORRECTABLE_ECC_ERR", "MP_PARITY_ERR", "MP_COHERENCE_ERR",
 131         "CMBIU_REQUEST_DECODE_ERR", "CMBIU_PARITY_ERR", "CMBIU_AXI_RESP_ERR",
 132         "0x9", "RBI_BUS_ERR", "0xb", "0xc", "0xd", "0xe", "0xf", "0x10",
 133         "0x11", "0x12", "0x13", "0x14", "0x15", "0x16", "0x17", "0x18",
 134         "0x19", "0x1a", "0x1b", "0x1c", "0x1d", "0x1e", "0x1f"
 135 };
 136
 137 static DEFINE_PER_CPU_ALIGNED(spinlock_t, cm_core_lock);
 138 static DEFINE_PER_CPU_ALIGNED(unsigned long, cm_core_lock_flags);
 139
 140 phys_addr_t __mips_cm_phys_base(void)
 141 {
 142         u32 config3 = read_c0_config3();
 143         unsigned long cmgcr;
 144
 145         /* Check the CMGCRBase register is implemented */
 146         if (!(config3 & MIPS_CONF3_CMGCR))
 147                 return 0;
 148
 149         /* Read the address from CMGCRBase */
 150         cmgcr = read_c0_cmgcrbase();
 151         return (cmgcr & MIPS_CMGCRF_BASE) << (36 - 32);
 152 }
 153
 154 phys_addr_t mips_cm_phys_base(void)
 155         __attribute__((weak, alias("__mips_cm_phys_base")));
 156
 157 phys_addr_t __mips_cm_l2sync_phys_base(void)
 158 {
 159         u32 base_reg;
 160
 161         /*
 162          * If the L2-only sync region is already enabled then leave it at it's
 163          * current location.
 164          */
 165         base_reg = read_gcr_l2_only_sync_base();
 166         if (base_reg & CM_GCR_L2_ONLY_SYNC_BASE_SYNCEN)
 167                 return base_reg & CM_GCR_L2_ONLY_SYNC_BASE_SYNCBASE;
 168
 169         /* Default to following the CM */
 170         return mips_cm_phys_base() + MIPS_CM_GCR_SIZE;
 171 }
 172
 173 phys_addr_t mips_cm_l2sync_phys_base(void)
 174         __attribute__((weak, alias("__mips_cm_l2sync_phys_base")));
 175
 176 static void mips_cm_probe_l2sync(void)
 177 {
 178         unsigned major_rev;
 179         phys_addr_t addr;
 180
 181         /* L2-only sync was introduced with CM major revision 6 */
 182         major_rev = (read_gcr_rev() & CM_GCR_REV_MAJOR) >>
 183                 __ffs(CM_GCR_REV_MAJOR);
 184         if (major_rev < 6)
 185                 return;
 186
 187         /* Find a location for the L2 sync region */
 188         addr = mips_cm_l2sync_phys_base();
 189         BUG_ON((addr & CM_GCR_L2_ONLY_SYNC_BASE_SYNCBASE) != addr);
 190         if (!addr)
 191                 return;
 192
 193         /* Set the region base address & enable it */
 194         write_gcr_l2_only_sync_base(addr | CM_GCR_L2_ONLY_SYNC_BASE_SYNCEN);
 195
 196         /* Map the region */
 197         mips_cm_l2sync_base = ioremap_nocache(addr, MIPS_CM_L2SYNC_SIZE);
 198 }
 199
 200 int mips_cm_probe(void)
 201 {
 202         phys_addr_t addr;
 203         u32 base_reg;
 204         unsigned cpu;
 205
 206         /*
 207          * No need to probe again if we have already been
 208          * here before.
 209          */
 210         if (mips_gcr_base)
 211                 return 0;
 212
 213         addr = mips_cm_phys_base();
 214         BUG_ON((addr & CM_GCR_BASE_GCRBASE) != addr);
 215         if (!addr)
 216                 return -ENODEV;
 217
 218         mips_gcr_base = ioremap_nocache(addr, MIPS_CM_GCR_SIZE);
 219         if (!mips_gcr_base)
 220                 return -ENXIO;
 221
 222         /* sanity check that we're looking at a CM */
 223         base_reg = read_gcr_base();
 224         if ((base_reg & CM_GCR_BASE_GCRBASE) != addr) {
 225                 pr_err("GCRs appear to have been moved (expected them at 0x%08lx)!\n",
 226                        (unsigned long)addr);
 227                 mips_gcr_base = NULL;
 228                 return -ENODEV;
 229         }
 230
 231         /* set default target to memory */
 232         change_gcr_base(CM_GCR_BASE_CMDEFTGT, CM_GCR_BASE_CMDEFTGT_MEM);
 233
 234         /* disable CM regions */
 235         write_gcr_reg0_base(CM_GCR_REGn_BASE_BASEADDR);
 236         write_gcr_reg0_mask(CM_GCR_REGn_MASK_ADDRMASK);
 237         write_gcr_reg1_base(CM_GCR_REGn_BASE_BASEADDR);
 238         write_gcr_reg1_mask(CM_GCR_REGn_MASK_ADDRMASK);
 239         write_gcr_reg2_base(CM_GCR_REGn_BASE_BASEADDR);
 240         write_gcr_reg2_mask(CM_GCR_REGn_MASK_ADDRMASK);
 241         write_gcr_reg3_base(CM_GCR_REGn_BASE_BASEADDR);
 242         write_gcr_reg3_mask(CM_GCR_REGn_MASK_ADDRMASK);
 243
 244         /* probe for an L2-only sync region */
 245         mips_cm_probe_l2sync();
 246
 247         /* determine register width for this CM */
 248         mips_cm_is64 = IS_ENABLED(CONFIG_64BIT) && (mips_cm_revision() >= CM_REV_CM3);
 249
 250         for_each_possible_cpu(cpu)
 251                 spin_lock_init(&per_cpu(cm_core_lock, cpu));
 252
 253         return 0;
 254 }
 255
 256 void mips_cm_lock_other(unsigned int cluster, unsigned int core,
 257                         unsigned int vp, unsigned int block)
 258 {
 259         unsigned int curr_core, cm_rev;
 260         u32 val;
 261
 262         cm_rev = mips_cm_revision();
 263         preempt_disable();
 264
 265         if (cm_rev >= CM_REV_CM3) {
 266                 val = core << __ffs(CM3_GCR_Cx_OTHER_CORE);
 267                 val |= vp << __ffs(CM3_GCR_Cx_OTHER_VP);
 268
 269                 if (cm_rev >= CM_REV_CM3_5) {
 270                         val |= CM_GCR_Cx_OTHER_CLUSTER_EN;
 271                         val |= cluster << __ffs(CM_GCR_Cx_OTHER_CLUSTER);
 272                         val |= block << __ffs(CM_GCR_Cx_OTHER_BLOCK);
 273                 } else {
 274                         WARN_ON(cluster != 0);
 275                         WARN_ON(block != CM_GCR_Cx_OTHER_BLOCK_LOCAL);
 276                 }
 277
 278                 /*
 279                  * We need to disable interrupts in SMP systems in order to
 280                  * ensure that we don't interrupt the caller with code which
 281                  * may modify the redirect register. We do so here in a
 282                  * slightly obscure way by using a spin lock, since this has
 283                  * the neat property of also catching any nested uses of
 284                  * mips_cm_lock_other() leading to a deadlock or a nice warning
 285                  * with lockdep enabled.
 286                  */
 287                 spin_lock_irqsave(this_cpu_ptr(&cm_core_lock),
 288                                   *this_cpu_ptr(&cm_core_lock_flags));
 289         } else {
 290                 WARN_ON(cluster != 0);
 291                 WARN_ON(block != CM_GCR_Cx_OTHER_BLOCK_LOCAL);
 292
 293                 /*
 294                  * We only have a GCR_CL_OTHER per core in systems with
 295                  * CM 2.5 & older, so have to ensure other VP(E)s don't
 296                  * race with us.
 297                  */
 298                 curr_core = cpu_core(&current_cpu_data);
 299                 spin_lock_irqsave(&per_cpu(cm_core_lock, curr_core),
 300                                   per_cpu(cm_core_lock_flags, curr_core));
 301
 302                 val = core << __ffs(CM_GCR_Cx_OTHER_CORENUM);
 303         }
 304
 305         write_gcr_cl_other(val);
 306
 307         /*
 308          * Ensure the core-other region reflects the appropriate core &
 309          * VP before any accesses to it occur.
 310          */
 311         mb();
 312 }
 313
 314 void mips_cm_unlock_other(void)
 315 {
 316         unsigned int curr_core;
 317
 318         if (mips_cm_revision() < CM_REV_CM3) {
 319                 curr_core = cpu_core(&current_cpu_data);
 320                 spin_unlock_irqrestore(&per_cpu(cm_core_lock, curr_core),
 321                                        per_cpu(cm_core_lock_flags, curr_core));
 322         } else {
 323                 spin_unlock_irqrestore(this_cpu_ptr(&cm_core_lock),
 324                                        *this_cpu_ptr(&cm_core_lock_flags));
 325         }
 326
 327         preempt_enable();
 328 }
 329
 330 void mips_cm_error_report(void)
 331 {
 332         u64 cm_error, cm_addr, cm_other;
 333         unsigned long revision;
 334         int ocause, cause;
 335         char buf[256];
 336
 337         if (!mips_cm_present())
 338                 return;
 339
 340         revision = mips_cm_revision();
 341         cm_error = read_gcr_error_cause();
 342         cm_addr = read_gcr_error_addr();
 343         cm_other = read_gcr_error_mult();
 344
 345         if (revision < CM_REV_CM3) { /* CM2 */
 346                 cause = cm_error >> __ffs(CM_GCR_ERROR_CAUSE_ERRTYPE);
 347                 ocause = cm_other >> __ffs(CM_GCR_ERROR_MULT_ERR2ND);
 348
 349                 if (!cause)
 350                         return;
 351
 352                 if (cause < 16) {
 353                         unsigned long cca_bits = (cm_error >> 15) & 7;
 354                         unsigned long tr_bits = (cm_error >> 12) & 7;
 355                         unsigned long cmd_bits = (cm_error >> 7) & 0x1f;
 356                         unsigned long stag_bits = (cm_error >> 3) & 15;
 357                         unsigned long sport_bits = (cm_error >> 0) & 7;
 358
 359                         snprintf(buf, sizeof(buf),
 360                                  "CCA=%lu TR=%s MCmd=%s STag=%lu "
 361                                  "SPort=%lu\n", cca_bits, cm2_tr[tr_bits],
 362                                  cm2_cmd[cmd_bits], stag_bits, sport_bits);
 363                 } else {
 364                         /* glob state & sresp together */
 365                         unsigned long c3_bits = (cm_error >> 18) & 7;
 366                         unsigned long c2_bits = (cm_error >> 15) & 7;
 367                         unsigned long c1_bits = (cm_error >> 12) & 7;
 368                         unsigned long c0_bits = (cm_error >> 9) & 7;
 369                         unsigned long sc_bit = (cm_error >> 8) & 1;
 370                         unsigned long cmd_bits = (cm_error >> 3) & 0x1f;
 371                         unsigned long sport_bits = (cm_error >> 0) & 7;
 372
 373                         snprintf(buf, sizeof(buf),
 374                                  "C3=%s C2=%s C1=%s C0=%s SC=%s "
 375                                  "MCmd=%s SPort=%lu\n",
 376                                  cm2_core[c3_bits], cm2_core[c2_bits],
 377                                  cm2_core[c1_bits], cm2_core[c0_bits],
 378                                  sc_bit ? "True" : "False",
 379                                  cm2_cmd[cmd_bits], sport_bits);
 380                 }
 381                 pr_err("CM_ERROR=%08llx %s <%s>\n", cm_error,
 382                        cm2_causes[cause], buf);
 383                 pr_err("CM_ADDR =%08llx\n", cm_addr);
 384                 pr_err("CM_OTHER=%08llx %s\n", cm_other, cm2_causes[ocause]);
 385         } else { /* CM3 */
 386                 ulong core_id_bits, vp_id_bits, cmd_bits, cmd_group_bits;
 387                 ulong cm3_cca_bits, mcp_bits, cm3_tr_bits, sched_bit;
 388
 389                 cause = cm_error >> __ffs64(CM3_GCR_ERROR_CAUSE_ERRTYPE);
 390                 ocause = cm_other >> __ffs(CM_GCR_ERROR_MULT_ERR2ND);
 391
 392                 if (!cause)
 393                         return;
 394
 395                 /* Used by cause == {1,2,3} */
 396                 core_id_bits = (cm_error >> 22) & 0xf;
 397                 vp_id_bits = (cm_error >> 18) & 0xf;
 398                 cmd_bits = (cm_error >> 14) & 0xf;
 399                 cmd_group_bits = (cm_error >> 11) & 0xf;
 400                 cm3_cca_bits = (cm_error >> 8) & 7;
 401                 mcp_bits = (cm_error >> 5) & 0xf;
 402                 cm3_tr_bits = (cm_error >> 1) & 0xf;
 403                 sched_bit = cm_error & 0x1;
 404
 405                 if (cause == 1 || cause == 3) { /* Tag ECC */
 406                         unsigned long tag_ecc = (cm_error >> 57) & 0x1;
 407                         unsigned long tag_way_bits = (cm_error >> 29) & 0xffff;
 408                         unsigned long dword_bits = (cm_error >> 49) & 0xff;
 409                         unsigned long data_way_bits = (cm_error >> 45) & 0xf;
 410                         unsigned long data_sets_bits = (cm_error >> 29) & 0xfff;
 411                         unsigned long bank_bit = (cm_error >> 28) & 0x1;
 412                         snprintf(buf, sizeof(buf),
 413                                  "%s ECC Error: Way=%lu (DWORD=%lu, Sets=%lu)"
 414                                  "Bank=%lu CoreID=%lu VPID=%lu Command=%s"
 415                                  "Command Group=%s CCA=%lu MCP=%d"
 416                                  "Transaction type=%s Scheduler=%lu\n",
 417                                  tag_ecc ? "TAG" : "DATA",
 418                                  tag_ecc ? (unsigned long)ffs(tag_way_bits) - 1 :
 419                                  data_way_bits, bank_bit, dword_bits,
 420                                  data_sets_bits,
 421                                  core_id_bits, vp_id_bits,
 422                                  cm3_cmd[cmd_bits],
 423                                  cm3_cmd_group[cmd_group_bits],
 424                                  cm3_cca_bits, 1 << mcp_bits,
 425                                  cm3_tr[cm3_tr_bits], sched_bit);
 426                 } else if (cause == 2) {
 427                         unsigned long data_error_type = (cm_error >> 41) & 0xfff;
 428                         unsigned long data_decode_cmd = (cm_error >> 37) & 0xf;
 429                         unsigned long data_decode_group = (cm_error >> 34) & 0x7;
 430                         unsigned long data_decode_destination_id = (cm_error >> 28) & 0x3f;
 431
 432                         snprintf(buf, sizeof(buf),
 433                                  "Decode Request Error: Type=%lu, Command=%lu"
 434                                  "Command Group=%lu Destination ID=%lu"
 435                                  "CoreID=%lu VPID=%lu Command=%s"
 436                                  "Command Group=%s CCA=%lu MCP=%d"
 437                                  "Transaction type=%s Scheduler=%lu\n",
 438                                  data_error_type, data_decode_cmd,
 439                                  data_decode_group, data_decode_destination_id,
 440                                  core_id_bits, vp_id_bits,
 441                                  cm3_cmd[cmd_bits],
 442                                  cm3_cmd_group[cmd_group_bits],
 443                                  cm3_cca_bits, 1 << mcp_bits,
 444                                  cm3_tr[cm3_tr_bits], sched_bit);
 445                 } else {
 446                         buf[0] = 0;
 447                 }
 448
 449                 pr_err("CM_ERROR=%llx %s <%s>\n", cm_error,
 450                        cm3_causes[cause], buf);
 451                 pr_err("CM_ADDR =%llx\n", cm_addr);
 452                 pr_err("CM_OTHER=%llx %s\n", cm_other, cm3_causes[ocause]);
 453         }
 454
 455         /* reprime cause register */
 456         write_gcr_error_cause(cm_error);
 457 }