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
  22  __cacheline_aligned DEFINE_SPINLOCK(sal_lock);
  23 unsigned long sal_platform_features;
  24
  25 unsigned short sal_revision;
  26 unsigned short sal_version;
  27
  28 #define SAL_MAJOR(x) ((x) >> 8)
  29 #define SAL_MINOR(x) ((x) & 0xff)
  30
  31 static struct {
  32         void *addr;     /* function entry point */
  33         void *gpval;    /* gp value to use */
  34 } pdesc;
  35
  36 static long
  37 default_handler (void)
  38 {
  39         return -1;
  40 }
  41
  42 ia64_sal_handler ia64_sal = (ia64_sal_handler) default_handler;
  43 ia64_sal_desc_ptc_t *ia64_ptc_domain_info;
  44
  45 const char *
  46 ia64_sal_strerror (long status)
  47 {
  48         const char *str;
  49         switch (status) {
  50               case 0: str = "Call completed without error"; break;
  51               case 1: str = "Effect a warm boot of the system to complete "
  52                               "the update"; break;
  53               case -1: str = "Not implemented"; break;
  54               case -2: str = "Invalid argument"; break;
  55               case -3: str = "Call completed with error"; break;
  56               case -4: str = "Virtual address not registered"; break;
  57               case -5: str = "No information available"; break;
  58               case -6: str = "Insufficient space to add the entry"; break;
  59               case -7: str = "Invalid entry_addr value"; break;
  60               case -8: str = "Invalid interrupt vector"; break;
  61               case -9: str = "Requested memory not available"; break;
  62               case -10: str = "Unable to write to the NVM device"; break;
  63               case -11: str = "Invalid partition type specified"; break;
  64               case -12: str = "Invalid NVM_Object id specified"; break;
  65               case -13: str = "NVM_Object already has the maximum number "
  66                                 "of partitions"; break;
  67               case -14: str = "Insufficient space in partition for the "
  68                                 "requested write sub-function"; break;
  69               case -15: str = "Insufficient data buffer space for the "
  70                                 "requested read record sub-function"; break;
  71               case -16: str = "Scratch buffer required for the write/delete "
  72                                 "sub-function"; break;
  73               case -17: str = "Insufficient space in the NVM_Object for the "
  74                                 "requested create sub-function"; break;
  75               case -18: str = "Invalid value specified in the partition_rec "
  76                                 "argument"; break;
  77               case -19: str = "Record oriented I/O not supported for this "
  78                                 "partition"; break;
  79               case -20: str = "Bad format of record to be written or "
  80                                 "required keyword variable not "
  81                                 "specified"; break;
  82               default: str = "Unknown SAL status code"; break;
  83         }
  84         return str;
  85 }
  86
  87 void __init
  88 ia64_sal_handler_init (void *entry_point, void *gpval)
  89 {
  90         /* fill in the SAL procedure descriptor and point ia64_sal to it: */
  91         pdesc.addr = entry_point;
  92         pdesc.gpval = gpval;
  93         ia64_sal = (ia64_sal_handler) &pdesc;
  94 }
  95
  96 static void __init
  97 check_versions (struct ia64_sal_systab *systab)
  98 {
  99         sal_revision = (systab->sal_rev_major << 8) | systab->sal_rev_minor;
 100         sal_version = (systab->sal_b_rev_major << 8) | systab->sal_b_rev_minor;
 101
 102         /* Check for broken firmware */
 103         if ((sal_revision == SAL_VERSION_CODE(49, 29))
 104             && (sal_version == SAL_VERSION_CODE(49, 29)))
 105         {
 106                 /*
 107                  * Old firmware for zx2000 prototypes have this weird version number,
 108                  * reset it to something sane.
 109                  */
 110                 sal_revision = SAL_VERSION_CODE(2, 8);
 111                 sal_version = SAL_VERSION_CODE(0, 0);
 112         }
 113
 114         if (ia64_platform_is("sn2") && (sal_revision == SAL_VERSION_CODE(2, 9)))
 115                 /*
 116                  * SGI Altix has hard-coded version 2.9 in their prom
 117                  * but they actually implement 3.2, so let's fix it here.
 118                  */
 119                 sal_revision = SAL_VERSION_CODE(3, 2);
 120 }
 121
 122 static void __init
 123 sal_desc_entry_point (void *p)
 124 {
 125         struct ia64_sal_desc_entry_point *ep = p;
 126         ia64_pal_handler_init(__va(ep->pal_proc));
 127         ia64_sal_handler_init(__va(ep->sal_proc), __va(ep->gp));
 128 }
 129
 130 #ifdef CONFIG_SMP
 131 static void __init
 132 set_smp_redirect (int flag)
 133 {
 134 #ifndef CONFIG_HOTPLUG_CPU
 135         if (no_int_routing)
 136                 smp_int_redirect &= ~flag;
 137         else
 138                 smp_int_redirect |= flag;
 139 #else
 140         /*
 141          * For CPU Hotplug we dont want to do any chipset supported
 142          * interrupt redirection. The reason is this would require that
 143          * All interrupts be stopped and hard bind the irq to a cpu.
 144          * Later when the interrupt is fired we need to set the redir hint
 145          * on again in the vector. This is cumbersome for something that the
 146          * user mode irq balancer will solve anyways.
 147          */
 148         no_int_routing=1;
 149         smp_int_redirect &= ~flag;
 150 #endif
 151 }
 152 #else
 153 #define set_smp_redirect(flag)  do { } while (0)
 154 #endif
 155
 156 static void __init
 157 sal_desc_platform_feature (void *p)
 158 {
 159         struct ia64_sal_desc_platform_feature *pf = p;
 160         sal_platform_features = pf->feature_mask;
 161
 162         printk(KERN_INFO "SAL Platform features:");
 163         if (!sal_platform_features) {
 164                 printk(" None\n");
 165                 return;
 166         }
 167
 168         if (sal_platform_features & IA64_SAL_PLATFORM_FEATURE_BUS_LOCK)
 169                 printk(" BusLock");
 170         if (sal_platform_features & IA64_SAL_PLATFORM_FEATURE_IRQ_REDIR_HINT) {
 171                 printk(" IRQ_Redirection");
 172                 set_smp_redirect(SMP_IRQ_REDIRECTION);
 173         }
 174         if (sal_platform_features & IA64_SAL_PLATFORM_FEATURE_IPI_REDIR_HINT) {
 175                 printk(" IPI_Redirection");
 176                 set_smp_redirect(SMP_IPI_REDIRECTION);
 177         }
 178         if (sal_platform_features & IA64_SAL_PLATFORM_FEATURE_ITC_DRIFT)
 179                 printk(" ITC_Drift");
 180         printk("\n");
 181 }
 182
 183 #ifdef CONFIG_SMP
 184 static void __init
 185 sal_desc_ap_wakeup (void *p)
 186 {
 187         struct ia64_sal_desc_ap_wakeup *ap = p;
 188
 189         switch (ap->mechanism) {
 190         case IA64_SAL_AP_EXTERNAL_INT:
 191                 ap_wakeup_vector = ap->vector;
 192                 printk(KERN_INFO "SAL: AP wakeup using external interrupt "
 193                                 "vector 0x%lx\n", ap_wakeup_vector);
 194                 break;
 195         default:
 196                 printk(KERN_ERR "SAL: AP wakeup mechanism unsupported!\n");
 197                 break;
 198         }
 199 }
 200
 201 static void __init
 202 chk_nointroute_opt(void)
 203 {
 204         char *cp;
 205
 206         for (cp = boot_command_line; *cp; ) {
 207                 if (memcmp(cp, "nointroute", 10) == 0) {
 208                         no_int_routing = 1;
 209                         printk ("no_int_routing on\n");
 210                         break;
 211                 } else {
 212                         while (*cp != ' ' && *cp)
 213                                 ++cp;
 214                         while (*cp == ' ')
 215                                 ++cp;
 216                 }
 217         }
 218 }
 219
 220 #else
 221 static void __init sal_desc_ap_wakeup(void *p) { }
 222 #endif
 223
 224 /*
 225  * HP rx5670 firmware polls for interrupts during SAL_CACHE_FLUSH by reading
 226  * cr.ivr, but it never writes cr.eoi.  This leaves any interrupt marked as
 227  * "in-service" and masks other interrupts of equal or lower priority.
 228  *
 229  * HP internal defect reports: F1859, F2775, F3031.
 230  */
 231 static int sal_cache_flush_drops_interrupts;
 232
 233 static int __init
 234 force_pal_cache_flush(char *str)
 235 {
 236         sal_cache_flush_drops_interrupts = 1;
 237         return 0;
 238 }
 239 early_param("force_pal_cache_flush", force_pal_cache_flush);
 240
 241 void __init
 242 check_sal_cache_flush (void)
 243 {
 244         unsigned long flags;
 245         int cpu;
 246         u64 vector, cache_type = 3;
 247         struct ia64_sal_retval isrv;
 248
 249         if (sal_cache_flush_drops_interrupts)
 250                 return;
 251
 252         cpu = get_cpu();
 253         local_irq_save(flags);
 254
 255         /*
 256          * Send ourselves a timer interrupt, wait until it's reported, and see
 257          * if SAL_CACHE_FLUSH drops it.
 258          */
 259         platform_send_ipi(cpu, IA64_TIMER_VECTOR, IA64_IPI_DM_INT, 0);
 260
 261         while (!ia64_get_irr(IA64_TIMER_VECTOR))
 262                 cpu_relax();
 263
 264         SAL_CALL(isrv, SAL_CACHE_FLUSH, cache_type, 0, 0, 0, 0, 0, 0);
 265
 266         if (isrv.status)
 267                 printk(KERN_ERR "SAL_CAL_FLUSH failed with %ld\n", isrv.status);
 268
 269         if (ia64_get_irr(IA64_TIMER_VECTOR)) {
 270                 vector = ia64_get_ivr();
 271                 ia64_eoi();
 272                 WARN_ON(vector != IA64_TIMER_VECTOR);
 273         } else {
 274                 sal_cache_flush_drops_interrupts = 1;
 275                 printk(KERN_ERR "SAL: SAL_CACHE_FLUSH drops interrupts; "
 276                         "PAL_CACHE_FLUSH will be used instead\n");
 277                 ia64_eoi();
 278         }
 279
 280         local_irq_restore(flags);
 281         put_cpu();
 282 }
 283
 284 s64
 285 ia64_sal_cache_flush (u64 cache_type)
 286 {
 287         struct ia64_sal_retval isrv;
 288
 289         if (sal_cache_flush_drops_interrupts) {
 290                 unsigned long flags;
 291                 u64 progress;
 292                 s64 rc;
 293
 294                 progress = 0;
 295                 local_irq_save(flags);
 296                 rc = ia64_pal_cache_flush(cache_type,
 297                         PAL_CACHE_FLUSH_INVALIDATE, &progress, NULL);
 298                 local_irq_restore(flags);
 299                 return rc;
 300         }
 301
 302         SAL_CALL(isrv, SAL_CACHE_FLUSH, cache_type, 0, 0, 0, 0, 0, 0);
 303         return isrv.status;
 304 }
 305 EXPORT_SYMBOL_GPL(ia64_sal_cache_flush);
 306
 307 void __init
 308 ia64_sal_init (struct ia64_sal_systab *systab)
 309 {
 310         char *p;
 311         int i;
 312
 313         if (!systab) {
 314                 printk(KERN_WARNING "Hmm, no SAL System Table.\n");
 315                 return;
 316         }
 317
 318         if (strncmp(systab->signature, "SST_", 4) != 0)
 319                 printk(KERN_ERR "bad signature in system table!");
 320
 321         check_versions(systab);
 322 #ifdef CONFIG_SMP
 323         chk_nointroute_opt();
 324 #endif
 325
 326         /* revisions are coded in BCD, so %x does the job for us */
 327         printk(KERN_INFO "SAL %x.%x: %.32s %.32s%sversion %x.%x\n",
 328                         SAL_MAJOR(sal_revision), SAL_MINOR(sal_revision),
 329                         systab->oem_id, systab->product_id,
 330                         systab->product_id[0] ? " " : "",
 331                         SAL_MAJOR(sal_version), SAL_MINOR(sal_version));
 332
 333         p = (char *) (systab + 1);
 334         for (i = 0; i < systab->entry_count; i++) {
 335                 /*
 336                  * The first byte of each entry type contains the type
 337                  * descriptor.
 338                  */
 339                 switch (*p) {
 340                 case SAL_DESC_ENTRY_POINT:
 341                         sal_desc_entry_point(p);
 342                         break;
 343                 case SAL_DESC_PLATFORM_FEATURE:
 344                         sal_desc_platform_feature(p);
 345                         break;
 346                 case SAL_DESC_PTC:
 347                         ia64_ptc_domain_info = (ia64_sal_desc_ptc_t *)p;
 348                         break;
 349                 case SAL_DESC_AP_WAKEUP:
 350                         sal_desc_ap_wakeup(p);
 351                         break;
 352                 }
 353                 p += SAL_DESC_SIZE(*p);
 354         }
 355
 356 }
 357
 358 int
 359 ia64_sal_oemcall(struct ia64_sal_retval *isrvp, u64 oemfunc, u64 arg1,
 360                  u64 arg2, u64 arg3, u64 arg4, u64 arg5, u64 arg6, u64 arg7)
 361 {
 362         if (oemfunc < IA64_SAL_OEMFUNC_MIN || oemfunc > IA64_SAL_OEMFUNC_MAX)
 363                 return -1;
 364         SAL_CALL(*isrvp, oemfunc, arg1, arg2, arg3, arg4, arg5, arg6, arg7);
 365         return 0;
 366 }
 367 EXPORT_SYMBOL(ia64_sal_oemcall);
 368
 369 int
 370 ia64_sal_oemcall_nolock(struct ia64_sal_retval *isrvp, u64 oemfunc, u64 arg1,
 371                         u64 arg2, u64 arg3, u64 arg4, u64 arg5, u64 arg6,
 372                         u64 arg7)
 373 {
 374         if (oemfunc < IA64_SAL_OEMFUNC_MIN || oemfunc > IA64_SAL_OEMFUNC_MAX)
 375                 return -1;
 376         SAL_CALL_NOLOCK(*isrvp, oemfunc, arg1, arg2, arg3, arg4, arg5, arg6,
 377                         arg7);
 378         return 0;
 379 }
 380 EXPORT_SYMBOL(ia64_sal_oemcall_nolock);
 381
 382 int
 383 ia64_sal_oemcall_reentrant(struct ia64_sal_retval *isrvp, u64 oemfunc,
 384                            u64 arg1, u64 arg2, u64 arg3, u64 arg4, u64 arg5,
 385                            u64 arg6, u64 arg7)
 386 {
 387         if (oemfunc < IA64_SAL_OEMFUNC_MIN || oemfunc > IA64_SAL_OEMFUNC_MAX)
 388                 return -1;
 389         SAL_CALL_REENTRANT(*isrvp, oemfunc, arg1, arg2, arg3, arg4, arg5, arg6,
 390                            arg7);
 391         return 0;
 392 }
 393 EXPORT_SYMBOL(ia64_sal_oemcall_reentrant);
 394
 395 long
 396 ia64_sal_freq_base (unsigned long which, unsigned long *ticks_per_second,
 397                     unsigned long *drift_info)
 398 {
 399         struct ia64_sal_retval isrv;
 400
 401         SAL_CALL(isrv, SAL_FREQ_BASE, which, 0, 0, 0, 0, 0, 0);
 402         *ticks_per_second = isrv.v0;
 403         *drift_info = isrv.v1;
 404         return isrv.status;
 405 }
 406 EXPORT_SYMBOL_GPL(ia64_sal_freq_base);