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/module.h> 10 #include <linux/interrupt.h> 11 #include <linux/security.h> 12 13 #include <asm/cpu.h> 14 #include <asm/processor.h> 15 #include <asm/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 = 0; 129 static int mt_opt_rpsctl = -1; 130 static int mt_opt_nblsu = -1; 131 static int mt_opt_forceconfig7 = 0; 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 = 0; 165 int mt_protdflush = 0; 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 = 0; 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); 333