arch/mips/kernel/mips-mt.c

   1 /*
   2  * General MIPS MT support routines, usable in AP/SP, SMVP, or SMTC kernels
   3  * Copyright (C) 2005 Mips Technologies, Inc
   4  */
   5
   6 #include <linux/device.h>
   7 #include <linux/kernel.h>
   8 #include <linux/sched.h>
   9 #include <linux/export.h>
  10 #include <linux/interrupt.h>
  11 #include <linux/security.h>
  12
  13 #include <asm/cpu.h>
  14 #include <asm/processor.h>
  15 #include <linux/atomic.h>
  16 #include <asm/system.h>
  17 #include <asm/hardirq.h>
  18 #include <asm/mmu_context.h>
  19 #include <asm/mipsmtregs.h>
  20 #include <asm/r4kcache.h>
  21 #include <asm/cacheflush.h>
  22
  23 int vpelimit;
  24
  25 static int __init maxvpes(char *str)
  26 {
  27         get_option(&str, &vpelimit);
  28
  29         return 1;
  30 }
  31
  32 __setup("maxvpes=", maxvpes);
  33
  34 int tclimit;
  35
  36 static int __init maxtcs(char *str)
  37 {
  38         get_option(&str, &tclimit);
  39
  40         return 1;
  41 }
  42
  43 __setup("maxtcs=", maxtcs);
  44
  45 /*
  46  * Dump new MIPS MT state for the core. Does not leave TCs halted.
  47  * Takes an argument which taken to be a pre-call MVPControl value.
  48  */
  49
  50 void mips_mt_regdump(unsigned long mvpctl)
  51 {
  52         unsigned long flags;
  53         unsigned long vpflags;
  54         unsigned long mvpconf0;
  55         int nvpe;
  56         int ntc;
  57         int i;
  58         int tc;
  59         unsigned long haltval;
  60         unsigned long tcstatval;
  61 #ifdef CONFIG_MIPS_MT_SMTC
  62         void smtc_soft_dump(void);
  63 #endif /* CONFIG_MIPT_MT_SMTC */
  64
  65         local_irq_save(flags);
  66         vpflags = dvpe();
  67         printk("=== MIPS MT State Dump ===\n");
  68         printk("-- Global State --\n");
  69         printk("   MVPControl Passed: %08lx\n", mvpctl);
  70         printk("   MVPControl Read: %08lx\n", vpflags);
  71         printk("   MVPConf0 : %08lx\n", (mvpconf0 = read_c0_mvpconf0()));
  72         nvpe = ((mvpconf0 & MVPCONF0_PVPE) >> MVPCONF0_PVPE_SHIFT) + 1;
  73         ntc = ((mvpconf0 & MVPCONF0_PTC) >> MVPCONF0_PTC_SHIFT) + 1;
  74         printk("-- per-VPE State --\n");
  75         for (i = 0; i < nvpe; i++) {
  76                 for (tc = 0; tc < ntc; tc++) {
  77                         settc(tc);
  78                         if ((read_tc_c0_tcbind() & TCBIND_CURVPE) == i) {
  79                                 printk("  VPE %d\n", i);
  80                                 printk("   VPEControl : %08lx\n",
  81                                        read_vpe_c0_vpecontrol());
  82                                 printk("   VPEConf0 : %08lx\n",
  83                                        read_vpe_c0_vpeconf0());
  84                                 printk("   VPE%d.Status : %08lx\n",
  85                                        i, read_vpe_c0_status());
  86                                 printk("   VPE%d.EPC : %08lx %pS\n",
  87                                        i, read_vpe_c0_epc(),
  88                                        (void *) read_vpe_c0_epc());
  89                                 printk("   VPE%d.Cause : %08lx\n",
  90                                        i, read_vpe_c0_cause());
  91                                 printk("   VPE%d.Config7 : %08lx\n",
  92                                        i, read_vpe_c0_config7());
  93                                 break; /* Next VPE */
  94                         }
  95                 }
  96         }
  97         printk("-- per-TC State --\n");
  98         for (tc = 0; tc < ntc; tc++) {
  99                 settc(tc);
 100                 if (read_tc_c0_tcbind() == read_c0_tcbind()) {
 101                         /* Are we dumping ourself?  */
 102                         haltval = 0; /* Then we're not halted, and mustn't be */
 103                         tcstatval = flags; /* And pre-dump TCStatus is flags */
 104                         printk("  TC %d (current TC with VPE EPC above)\n", tc);
 105                 } else {
 106                         haltval = read_tc_c0_tchalt();
 107                         write_tc_c0_tchalt(1);
 108                         tcstatval = read_tc_c0_tcstatus();
 109                         printk("  TC %d\n", tc);
 110                 }
 111                 printk("   TCStatus : %08lx\n", tcstatval);
 112                 printk("   TCBind : %08lx\n", read_tc_c0_tcbind());
 113                 printk("   TCRestart : %08lx %pS\n",
 114                        read_tc_c0_tcrestart(), (void *) read_tc_c0_tcrestart());
 115                 printk("   TCHalt : %08lx\n", haltval);
 116                 printk("   TCContext : %08lx\n", read_tc_c0_tccontext());
 117                 if (!haltval)
 118                         write_tc_c0_tchalt(0);
 119         }
 120 #ifdef CONFIG_MIPS_MT_SMTC
 121         smtc_soft_dump();
 122 #endif /* CONFIG_MIPT_MT_SMTC */
 123         printk("===========================\n");
 124         evpe(vpflags);
 125         local_irq_restore(flags);
 126 }
 127
 128 static int mt_opt_norps;
 129 static int mt_opt_rpsctl = -1;
 130 static int mt_opt_nblsu = -1;
 131 static int mt_opt_forceconfig7;
 132 static int mt_opt_config7 = -1;
 133
 134 static int __init rps_disable(char *s)
 135 {
 136         mt_opt_norps = 1;
 137         return 1;
 138 }
 139 __setup("norps", rps_disable);
 140
 141 static int __init rpsctl_set(char *str)
 142 {
 143         get_option(&str, &mt_opt_rpsctl);
 144         return 1;
 145 }
 146 __setup("rpsctl=", rpsctl_set);
 147
 148 static int __init nblsu_set(char *str)
 149 {
 150         get_option(&str, &mt_opt_nblsu);
 151         return 1;
 152 }
 153 __setup("nblsu=", nblsu_set);
 154
 155 static int __init config7_set(char *str)
 156 {
 157         get_option(&str, &mt_opt_config7);
 158         mt_opt_forceconfig7 = 1;
 159         return 1;
 160 }
 161 __setup("config7=", config7_set);
 162
 163 /* Experimental cache flush control parameters that should go away some day */
 164 int mt_protiflush;
 165 int mt_protdflush;
 166 int mt_n_iflushes = 1;
 167 int mt_n_dflushes = 1;
 168
 169 static int __init set_protiflush(char *s)
 170 {
 171         mt_protiflush = 1;
 172         return 1;
 173 }
 174 __setup("protiflush", set_protiflush);
 175
 176 static int __init set_protdflush(char *s)
 177 {
 178         mt_protdflush = 1;
 179         return 1;
 180 }
 181 __setup("protdflush", set_protdflush);
 182
 183 static int __init niflush(char *s)
 184 {
 185         get_option(&s, &mt_n_iflushes);
 186         return 1;
 187 }
 188 __setup("niflush=", niflush);
 189
 190 static int __init ndflush(char *s)
 191 {
 192         get_option(&s, &mt_n_dflushes);
 193         return 1;
 194 }
 195 __setup("ndflush=", ndflush);
 196
 197 static unsigned int itc_base;
 198
 199 static int __init set_itc_base(char *str)
 200 {
 201         get_option(&str, &itc_base);
 202         return 1;
 203 }
 204
 205 __setup("itcbase=", set_itc_base);
 206
 207 void mips_mt_set_cpuoptions(void)
 208 {
 209         unsigned int oconfig7 = read_c0_config7();
 210         unsigned int nconfig7 = oconfig7;
 211
 212         if (mt_opt_norps) {
 213                 printk("\"norps\" option deprectated: use \"rpsctl=\"\n");
 214         }
 215         if (mt_opt_rpsctl >= 0) {
 216                 printk("34K return prediction stack override set to %d.\n",
 217                         mt_opt_rpsctl);
 218                 if (mt_opt_rpsctl)
 219                         nconfig7 |= (1 << 2);
 220                 else
 221                         nconfig7 &= ~(1 << 2);
 222         }
 223         if (mt_opt_nblsu >= 0) {
 224                 printk("34K ALU/LSU sync override set to %d.\n", mt_opt_nblsu);
 225                 if (mt_opt_nblsu)
 226                         nconfig7 |= (1 << 5);
 227                 else
 228                         nconfig7 &= ~(1 << 5);
 229         }
 230         if (mt_opt_forceconfig7) {
 231                 printk("CP0.Config7 forced to 0x%08x.\n", mt_opt_config7);
 232                 nconfig7 = mt_opt_config7;
 233         }
 234         if (oconfig7 != nconfig7) {
 235                 __asm__ __volatile("sync");
 236                 write_c0_config7(nconfig7);
 237                 ehb();
 238                 printk("Config7: 0x%08x\n", read_c0_config7());
 239         }
 240
 241         /* Report Cache management debug options */
 242         if (mt_protiflush)
 243                 printk("I-cache flushes single-threaded\n");
 244         if (mt_protdflush)
 245                 printk("D-cache flushes single-threaded\n");
 246         if (mt_n_iflushes != 1)
 247                 printk("I-Cache Flushes Repeated %d times\n", mt_n_iflushes);
 248         if (mt_n_dflushes != 1)
 249                 printk("D-Cache Flushes Repeated %d times\n", mt_n_dflushes);
 250
 251         if (itc_base != 0) {
 252                 /*
 253                  * Configure ITC mapping.  This code is very
 254                  * specific to the 34K core family, which uses
 255                  * a special mode bit ("ITC") in the ErrCtl
 256                  * register to enable access to ITC control
 257                  * registers via cache "tag" operations.
 258                  */
 259                 unsigned long ectlval;
 260                 unsigned long itcblkgrn;
 261
 262                 /* ErrCtl register is known as "ecc" to Linux */
 263                 ectlval = read_c0_ecc();
 264                 write_c0_ecc(ectlval | (0x1 << 26));
 265                 ehb();
 266 #define INDEX_0 (0x80000000)
 267 #define INDEX_8 (0x80000008)
 268                 /* Read "cache tag" for Dcache pseudo-index 8 */
 269                 cache_op(Index_Load_Tag_D, INDEX_8);
 270                 ehb();
 271                 itcblkgrn = read_c0_dtaglo();
 272                 itcblkgrn &= 0xfffe0000;
 273                 /* Set for 128 byte pitch of ITC cells */
 274                 itcblkgrn |= 0x00000c00;
 275                 /* Stage in Tag register */
 276                 write_c0_dtaglo(itcblkgrn);
 277                 ehb();
 278                 /* Write out to ITU with CACHE op */
 279                 cache_op(Index_Store_Tag_D, INDEX_8);
 280                 /* Now set base address, and turn ITC on with 0x1 bit */
 281                 write_c0_dtaglo((itc_base & 0xfffffc00) | 0x1 );
 282                 ehb();
 283                 /* Write out to ITU with CACHE op */
 284                 cache_op(Index_Store_Tag_D, INDEX_0);
 285                 write_c0_ecc(ectlval);
 286                 ehb();
 287                 printk("Mapped %ld ITC cells starting at 0x%08x\n",
 288                         ((itcblkgrn & 0x7fe00000) >> 20), itc_base);
 289         }
 290 }
 291
 292 /*
 293  * Function to protect cache flushes from concurrent execution
 294  * depends on MP software model chosen.
 295  */
 296
 297 void mt_cflush_lockdown(void)
 298 {
 299 #ifdef CONFIG_MIPS_MT_SMTC
 300         void smtc_cflush_lockdown(void);
 301
 302         smtc_cflush_lockdown();
 303 #endif /* CONFIG_MIPS_MT_SMTC */
 304         /* FILL IN VSMP and AP/SP VERSIONS HERE */
 305 }
 306
 307 void mt_cflush_release(void)
 308 {
 309 #ifdef CONFIG_MIPS_MT_SMTC
 310         void smtc_cflush_release(void);
 311
 312         smtc_cflush_release();
 313 #endif /* CONFIG_MIPS_MT_SMTC */
 314         /* FILL IN VSMP and AP/SP VERSIONS HERE */
 315 }
 316
 317 struct class *mt_class;
 318
 319 static int __init mt_init(void)
 320 {
 321         struct class *mtc;
 322
 323         mtc = class_create(THIS_MODULE, "mt");
 324         if (IS_ERR(mtc))
 325                 return PTR_ERR(mtc);
 326
 327         mt_class = mtc;
 328
 329         return 0;
 330 }
 331
 332 subsys_initcall(mt_init);