arch/ia64/kernel/sal.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * System Abstraction Layer (SAL) interface routines.
   4  *
   5  * Copyright (C) 1998, 1999, 2001, 2003 Hewlett-Packard Co
   6  *      David Mosberger-Tang <davidm@hpl.hp.com>
   7  * Copyright (C) 1999 VA Linux Systems
   8  * Copyright (C) 1999 Walt Drummond <drummond@valinux.com>
   9  */
  10
  11 #include <linux/kernel.h>
  12 #include <linux/init.h>
  13 #include <linux/module.h>
  14 #include <linux/spinlock.h>
  15 #include <linux/string.h>
  16
  17 #include <asm/delay.h>
  18 #include <asm/page.h>
  19 #include <asm/sal.h>
  20 #include <asm/pal.h>
  21 #include <asm/xtp.h>
  22
  23  __cacheline_aligned DEFINE_SPINLOCK(sal_lock);
  24 unsigned long sal_platform_features;
  25
  26 unsigned short sal_revision;
  27 unsigned short sal_version;
  28
  29 #define SAL_MAJOR(x) ((x) >> 8)
  30 #define SAL_MINOR(x) ((x) & 0xff)
  31
  32 static struct {
  33         void *addr;     /* function entry point */
  34         void *gpval;    /* gp value to use */
  35 } pdesc;
  36
  37 static long
  38 default_handler (void)
  39 {
  40         return -1;
  41 }
  42
  43 ia64_sal_handler ia64_sal = (ia64_sal_handler) default_handler;
  44 ia64_sal_desc_ptc_t *ia64_ptc_domain_info;
  45
  46 const char *
  47 ia64_sal_strerror (long status)
  48 {
  49         const char *str;
  50         switch (status) {
  51               case 0: str = "Call completed without error"; break;
  52               case 1: str = "Effect a warm boot of the system to complete "
  53                               "the update"; break;
  54               case -1: str = "Not implemented"; break;
  55               case -2: str = "Invalid argument"; break;
  56               case -3: str = "Call completed with error"; break;
  57               case -4: str = "Virtual address not registered"; break;
  58               case -5: str = "No information available"; break;
  59               case -6: str = "Insufficient space to add the entry"; break;
  60               case -7: str = "Invalid entry_addr value"; break;
  61               case -8: str = "Invalid interrupt vector"; break;
  62               case -9: str = "Requested memory not available"; break;
  63               case -10: str = "Unable to write to the NVM device"; break;
  64               case -11: str = "Invalid partition type specified"; break;
  65               case -12: str = "Invalid NVM_Object id specified"; break;
  66               case -13: str = "NVM_Object already has the maximum number "
  67                                 "of partitions"; break;
  68               case -14: str = "Insufficient space in partition for the "
  69                                 "requested write sub-function"; break;
  70               case -15: str = "Insufficient data buffer space for the "
  71                                 "requested read record sub-function"; break;
  72               case -16: str = "Scratch buffer required for the write/delete "
  73                                 "sub-function"; break;
  74               case -17: str = "Insufficient space in the NVM_Object for the "
  75                                 "requested create sub-function"; break;
  76               case -18: str = "Invalid value specified in the partition_rec "
  77                                 "argument"; break;
  78               case -19: str = "Record oriented I/O not supported for this "
  79                                 "partition"; break;
  80               case -20: str = "Bad format of record to be written or "
  81                                 "required keyword variable not "
  82                                 "specified"; break;
  83               default: str = "Unknown SAL status code"; break;
  84         }
  85         return str;
  86 }
  87
  88 void __init
  89 ia64_sal_handler_init (void *entry_point, void *gpval)
  90 {
  91         /* fill in the SAL procedure descriptor and point ia64_sal to it: */
  92         pdesc.addr = entry_point;
  93         pdesc.gpval = gpval;
  94         ia64_sal = (ia64_sal_handler) &pdesc;
  95 }
  96
  97 static void __init
  98 check_versions (struct ia64_sal_systab *systab)
  99 {
 100         sal_revision = (systab->sal_rev_major << 8) | systab->sal_rev_minor;
 101         sal_version = (systab->sal_b_rev_major << 8) | systab->sal_b_rev_minor;
 102
 103         /* Check for broken firmware */
 104         if ((sal_revision == SAL_VERSION_CODE(49, 29))
 105             && (sal_version == SAL_VERSION_CODE(49, 29)))
 106         {
 107                 /*
 108                  * Old firmware for zx2000 prototypes have this weird version number,
 109                  * reset it to something sane.
 110                  */
 111                 sal_revision = SAL_VERSION_CODE(2, 8);
 112                 sal_version = SAL_VERSION_CODE(0, 0);
 113         }
 114 }
 115
 116 static void __init
 117 sal_desc_entry_point (void *p)
 118 {
 119         struct ia64_sal_desc_entry_point *ep = p;
 120         ia64_pal_handler_init(__va(ep->pal_proc));
 121         ia64_sal_handler_init(__va(ep->sal_proc), __va(ep->gp));
 122 }
 123
 124 #ifdef CONFIG_SMP
 125 static void __init
 126 set_smp_redirect (int flag)
 127 {
 128 #ifndef CONFIG_HOTPLUG_CPU
 129         if (no_int_routing)
 130                 smp_int_redirect &= ~flag;
 131         else
 132                 smp_int_redirect |= flag;
 133 #else
 134         /*
 135          * For CPU Hotplug we dont want to do any chipset supported
 136          * interrupt redirection. The reason is this would require that
 137          * All interrupts be stopped and hard bind the irq to a cpu.
 138          * Later when the interrupt is fired we need to set the redir hint
 139          * on again in the vector. This is cumbersome for something that the
 140          * user mode irq balancer will solve anyways.
 141          */
 142         no_int_routing=1;
 143         smp_int_redirect &= ~flag;
 144 #endif
 145 }
 146 #else
 147 #define set_smp_redirect(flag)  do { } while (0)
 148 #endif
 149
 150 static void __init
 151 sal_desc_platform_feature (void *p)
 152 {
 153         struct ia64_sal_desc_platform_feature *pf = p;
 154         sal_platform_features = pf->feature_mask;
 155
 156         printk(KERN_INFO "SAL Platform features:");
 157         if (!sal_platform_features) {
 158                 printk(" None\n");
 159                 return;
 160         }
 161
 162         if (sal_platform_features & IA64_SAL_PLATFORM_FEATURE_BUS_LOCK)
 163                 printk(" BusLock");
 164         if (sal_platform_features & IA64_SAL_PLATFORM_FEATURE_IRQ_REDIR_HINT) {
 165                 printk(" IRQ_Redirection");
 166                 set_smp_redirect(SMP_IRQ_REDIRECTION);
 167         }
 168         if (sal_platform_features & IA64_SAL_PLATFORM_FEATURE_IPI_REDIR_HINT) {
 169                 printk(" IPI_Redirection");
 170                 set_smp_redirect(SMP_IPI_REDIRECTION);
 171         }
 172         if (sal_platform_features & IA64_SAL_PLATFORM_FEATURE_ITC_DRIFT)
 173                 printk(" ITC_Drift");
 174         printk("\n");
 175 }
 176
 177 #ifdef CONFIG_SMP
 178 static void __init
 179 sal_desc_ap_wakeup (void *p)
 180 {
 181         struct ia64_sal_desc_ap_wakeup *ap = p;
 182
 183         switch (ap->mechanism) {
 184         case IA64_SAL_AP_EXTERNAL_INT:
 185                 ap_wakeup_vector = ap->vector;
 186                 printk(KERN_INFO "SAL: AP wakeup using external interrupt "
 187                                 "vector 0x%lx\n", ap_wakeup_vector);
 188                 break;
 189         default:
 190                 printk(KERN_ERR "SAL: AP wakeup mechanism unsupported!\n");
 191                 break;
 192         }
 193 }
 194
 195 static void __init
 196 chk_nointroute_opt(void)
 197 {
 198         char *cp;
 199
 200         for (cp = boot_command_line; *cp; ) {
 201                 if (memcmp(cp, "nointroute", 10) == 0) {
 202                         no_int_routing = 1;
 203                         printk ("no_int_routing on\n");
 204                         break;
 205                 } else {
 206                         while (*cp != ' ' && *cp)
 207                                 ++cp;
 208                         while (*cp == ' ')
 209                                 ++cp;
 210                 }
 211         }
 212 }
 213
 214 #else
 215 static void __init sal_desc_ap_wakeup(void *p) { }
 216 #endif
 217
 218 /*
 219  * HP rx5670 firmware polls for interrupts during SAL_CACHE_FLUSH by reading
 220  * cr.ivr, but it never writes cr.eoi.  This leaves any interrupt marked as
 221  * "in-service" and masks other interrupts of equal or lower priority.
 222  *
 223  * HP internal defect reports: F1859, F2775, F3031.
 224  */
 225 static int sal_cache_flush_drops_interrupts;
 226
 227 static int __init
 228 force_pal_cache_flush(char *str)
 229 {
 230         sal_cache_flush_drops_interrupts = 1;
 231         return 0;
 232 }
 233 early_param("force_pal_cache_flush", force_pal_cache_flush);
 234
 235 void __init
 236 check_sal_cache_flush (void)
 237 {
 238         unsigned long flags;
 239         int cpu;
 240         u64 vector, cache_type = 3;
 241         struct ia64_sal_retval isrv;
 242
 243         if (sal_cache_flush_drops_interrupts)
 244                 return;
 245
 246         cpu = get_cpu();
 247         local_irq_save(flags);
 248
 249         /*
 250          * Send ourselves a timer interrupt, wait until it's reported, and see
 251          * if SAL_CACHE_FLUSH drops it.
 252          */
 253         ia64_send_ipi(cpu, IA64_TIMER_VECTOR, IA64_IPI_DM_INT, 0);
 254
 255         while (!ia64_get_irr(IA64_TIMER_VECTOR))
 256                 cpu_relax();
 257
 258         SAL_CALL(isrv, SAL_CACHE_FLUSH, cache_type, 0, 0, 0, 0, 0, 0);
 259
 260         if (isrv.status)
 261                 printk(KERN_ERR "SAL_CAL_FLUSH failed with %ld\n", isrv.status);
 262
 263         if (ia64_get_irr(IA64_TIMER_VECTOR)) {
 264                 vector = ia64_get_ivr();
 265                 ia64_eoi();
 266                 WARN_ON(vector != IA64_TIMER_VECTOR);
 267         } else {
 268                 sal_cache_flush_drops_interrupts = 1;
 269                 printk(KERN_ERR "SAL: SAL_CACHE_FLUSH drops interrupts; "
 270                         "PAL_CACHE_FLUSH will be used instead\n");
 271                 ia64_eoi();
 272         }
 273
 274         local_irq_restore(flags);
 275         put_cpu();
 276 }
 277
 278 s64
 279 ia64_sal_cache_flush (u64 cache_type)
 280 {
 281         struct ia64_sal_retval isrv;
 282
 283         if (sal_cache_flush_drops_interrupts) {
 284                 unsigned long flags;
 285                 u64 progress;
 286                 s64 rc;
 287
 288                 progress = 0;
 289                 local_irq_save(flags);
 290                 rc = ia64_pal_cache_flush(cache_type,
 291                         PAL_CACHE_FLUSH_INVALIDATE, &progress, NULL);
 292                 local_irq_restore(flags);
 293                 return rc;
 294         }
 295
 296         SAL_CALL(isrv, SAL_CACHE_FLUSH, cache_type, 0, 0, 0, 0, 0, 0);
 297         return isrv.status;
 298 }
 299 EXPORT_SYMBOL_GPL(ia64_sal_cache_flush);
 300
 301 void __init
 302 ia64_sal_init (struct ia64_sal_systab *systab)
 303 {
 304         char *p;
 305         int i;
 306
 307         if (!systab) {
 308                 printk(KERN_WARNING "Hmm, no SAL System Table.\n");
 309                 return;
 310         }
 311
 312         if (strncmp(systab->signature, "SST_", 4) != 0)
 313                 printk(KERN_ERR "bad signature in system table!");
 314
 315         check_versions(systab);
 316 #ifdef CONFIG_SMP
 317         chk_nointroute_opt();
 318 #endif
 319
 320         /* revisions are coded in BCD, so %x does the job for us */
 321         printk(KERN_INFO "SAL %x.%x: %.32s %.32s%sversion %x.%x\n",
 322                         SAL_MAJOR(sal_revision), SAL_MINOR(sal_revision),
 323                         systab->oem_id, systab->product_id,
 324                         systab->product_id[0] ? " " : "",
 325                         SAL_MAJOR(sal_version), SAL_MINOR(sal_version));
 326
 327         p = (char *) (systab + 1);
 328         for (i = 0; i < systab->entry_count; i++) {
 329                 /*
 330                  * The first byte of each entry type contains the type
 331                  * descriptor.
 332                  */
 333                 switch (*p) {
 334                 case SAL_DESC_ENTRY_POINT:
 335                         sal_desc_entry_point(p);
 336                         break;
 337                 case SAL_DESC_PLATFORM_FEATURE:
 338                         sal_desc_platform_feature(p);
 339                         break;
 340                 case SAL_DESC_PTC:
 341                         ia64_ptc_domain_info = (ia64_sal_desc_ptc_t *)p;
 342                         break;
 343                 case SAL_DESC_AP_WAKEUP:
 344                         sal_desc_ap_wakeup(p);
 345                         break;
 346                 }
 347                 p += SAL_DESC_SIZE(*p);
 348         }
 349
 350 }
 351
 352 int
 353 ia64_sal_oemcall(struct ia64_sal_retval *isrvp, u64 oemfunc, u64 arg1,
 354                  u64 arg2, u64 arg3, u64 arg4, u64 arg5, u64 arg6, u64 arg7)
 355 {
 356         if (oemfunc < IA64_SAL_OEMFUNC_MIN || oemfunc > IA64_SAL_OEMFUNC_MAX)
 357                 return -1;
 358         SAL_CALL(*isrvp, oemfunc, arg1, arg2, arg3, arg4, arg5, arg6, arg7);
 359         return 0;
 360 }
 361 EXPORT_SYMBOL(ia64_sal_oemcall);
 362
 363 int
 364 ia64_sal_oemcall_nolock(struct ia64_sal_retval *isrvp, u64 oemfunc, u64 arg1,
 365                         u64 arg2, u64 arg3, u64 arg4, u64 arg5, u64 arg6,
 366                         u64 arg7)
 367 {
 368         if (oemfunc < IA64_SAL_OEMFUNC_MIN || oemfunc > IA64_SAL_OEMFUNC_MAX)
 369                 return -1;
 370         SAL_CALL_NOLOCK(*isrvp, oemfunc, arg1, arg2, arg3, arg4, arg5, arg6,
 371                         arg7);
 372         return 0;
 373 }
 374 EXPORT_SYMBOL(ia64_sal_oemcall_nolock);
 375
 376 int
 377 ia64_sal_oemcall_reentrant(struct ia64_sal_retval *isrvp, u64 oemfunc,
 378                            u64 arg1, u64 arg2, u64 arg3, u64 arg4, u64 arg5,
 379                            u64 arg6, u64 arg7)
 380 {
 381         if (oemfunc < IA64_SAL_OEMFUNC_MIN || oemfunc > IA64_SAL_OEMFUNC_MAX)
 382                 return -1;
 383         SAL_CALL_REENTRANT(*isrvp, oemfunc, arg1, arg2, arg3, arg4, arg5, arg6,
 384                            arg7);
 385         return 0;
 386 }
 387 EXPORT_SYMBOL(ia64_sal_oemcall_reentrant);
 388
 389 long
 390 ia64_sal_freq_base (unsigned long which, unsigned long *ticks_per_second,
 391                     unsigned long *drift_info)
 392 {
 393         struct ia64_sal_retval isrv;
 394
 395         SAL_CALL(isrv, SAL_FREQ_BASE, which, 0, 0, 0, 0, 0, 0);
 396         *ticks_per_second = isrv.v0;
 397         *drift_info = isrv.v1;
 398         return isrv.status;
 399 }
 400 EXPORT_SYMBOL_GPL(ia64_sal_freq_base);