drivers/s390/sysinfo.c

   1 /*
   2  *  drivers/s390/sysinfo.c
   3  *
   4  *    Copyright (C) 2001 IBM Deutschland Entwicklung GmbH, IBM Corporation
   5  *    Author(s): Ulrich Weigand (Ulrich.Weigand@de.ibm.com)
   6  */
   7
   8 #include <linux/kernel.h>
   9 #include <linux/mm.h>
  10 #include <linux/proc_fs.h>
  11 #include <linux/init.h>
  12 #include <linux/delay.h>
  13 #include <asm/ebcdic.h>
  14 #include <asm/sysinfo.h>
  15
  16 /* Sigh, math-emu. Don't ask. */
  17 #include <asm/sfp-util.h>
  18 #include <math-emu/soft-fp.h>
  19 #include <math-emu/single.h>
  20
  21 static inline int stsi_0(void)
  22 {
  23         int rc = stsi (NULL, 0, 0, 0);
  24         return rc == -ENOSYS ? rc : (((unsigned int) rc) >> 28);
  25 }
  26
  27 static int stsi_1_1_1(struct sysinfo_1_1_1 *info, char *page, int len)
  28 {
  29         if (stsi(info, 1, 1, 1) == -ENOSYS)
  30                 return len;
  31
  32         EBCASC(info->manufacturer, sizeof(info->manufacturer));
  33         EBCASC(info->type, sizeof(info->type));
  34         EBCASC(info->model, sizeof(info->model));
  35         EBCASC(info->sequence, sizeof(info->sequence));
  36         EBCASC(info->plant, sizeof(info->plant));
  37         EBCASC(info->model_capacity, sizeof(info->model_capacity));
  38         EBCASC(info->model_perm_cap, sizeof(info->model_perm_cap));
  39         EBCASC(info->model_temp_cap, sizeof(info->model_temp_cap));
  40         len += sprintf(page + len, "Manufacturer:         %-16.16s\n",
  41                        info->manufacturer);
  42         len += sprintf(page + len, "Type:                 %-4.4s\n",
  43                        info->type);
  44         if (info->model[0] != '\0')
  45                 /*
  46                  * Sigh: the model field has been renamed with System z9
  47                  * to model_capacity and a new model field has been added
  48                  * after the plant field. To avoid confusing older programs
  49                  * the "Model:" prints "model_capacity model" or just
  50                  * "model_capacity" if the model string is empty .
  51                  */
  52                 len += sprintf(page + len,
  53                                "Model:                %-16.16s %-16.16s\n",
  54                                info->model_capacity, info->model);
  55         else
  56                 len += sprintf(page + len, "Model:                %-16.16s\n",
  57                                info->model_capacity);
  58         len += sprintf(page + len, "Sequence Code:        %-16.16s\n",
  59                        info->sequence);
  60         len += sprintf(page + len, "Plant:                %-4.4s\n",
  61                        info->plant);
  62         len += sprintf(page + len, "Model Capacity:       %-16.16s %08u\n",
  63                        info->model_capacity, *(u32 *) info->model_cap_rating);
  64         if (info->model_perm_cap[0] != '\0')
  65                 len += sprintf(page + len,
  66                                "Model Perm. Capacity: %-16.16s %08u\n",
  67                                info->model_perm_cap,
  68                                *(u32 *) info->model_perm_cap_rating);
  69         if (info->model_temp_cap[0] != '\0')
  70                 len += sprintf(page + len,
  71                                "Model Temp. Capacity: %-16.16s %08u\n",
  72                                info->model_temp_cap,
  73                                *(u32 *) info->model_temp_cap_rating);
  74         return len;
  75 }
  76
  77 #if 0 /* Currently unused */
  78 static int stsi_1_2_1(struct sysinfo_1_2_1 *info, char *page, int len)
  79 {
  80         if (stsi(info, 1, 2, 1) == -ENOSYS)
  81                 return len;
  82
  83         len += sprintf(page + len, "\n");
  84         EBCASC(info->sequence, sizeof(info->sequence));
  85         EBCASC(info->plant, sizeof(info->plant));
  86         len += sprintf(page + len, "Sequence Code of CPU: %-16.16s\n",
  87                        info->sequence);
  88         len += sprintf(page + len, "Plant of CPU:         %-16.16s\n",
  89                        info->plant);
  90         return len;
  91 }
  92 #endif
  93
  94 static int stsi_1_2_2(struct sysinfo_1_2_2 *info, char *page, int len)
  95 {
  96         struct sysinfo_1_2_2_extension *ext;
  97         int i;
  98
  99         if (stsi(info, 1, 2, 2) == -ENOSYS)
 100                 return len;
 101         ext = (struct sysinfo_1_2_2_extension *)
 102                 ((unsigned long) info + info->acc_offset);
 103
 104         len += sprintf(page + len, "\n");
 105         len += sprintf(page + len, "CPUs Total:           %d\n",
 106                        info->cpus_total);
 107         len += sprintf(page + len, "CPUs Configured:      %d\n",
 108                        info->cpus_configured);
 109         len += sprintf(page + len, "CPUs Standby:         %d\n",
 110                        info->cpus_standby);
 111         len += sprintf(page + len, "CPUs Reserved:        %d\n",
 112                        info->cpus_reserved);
 113
 114         if (info->format == 1) {
 115                 /*
 116                  * Sigh 2. According to the specification the alternate
 117                  * capability field is a 32 bit floating point number
 118                  * if the higher order 8 bits are not zero. Printing
 119                  * a floating point number in the kernel is a no-no,
 120                  * always print the number as 32 bit unsigned integer.
 121                  * The user-space needs to know about the strange
 122                  * encoding of the alternate cpu capability.
 123                  */
 124                 len += sprintf(page + len, "Capability:           %u %u\n",
 125                                info->capability, ext->alt_capability);
 126                 for (i = 2; i <= info->cpus_total; i++)
 127                         len += sprintf(page + len,
 128                                        "Adjustment %02d-way:    %u %u\n",
 129                                        i, info->adjustment[i-2],
 130                                        ext->alt_adjustment[i-2]);
 131
 132         } else {
 133                 len += sprintf(page + len, "Capability:           %u\n",
 134                                info->capability);
 135                 for (i = 2; i <= info->cpus_total; i++)
 136                         len += sprintf(page + len,
 137                                        "Adjustment %02d-way:    %u\n",
 138                                        i, info->adjustment[i-2]);
 139         }
 140
 141         if (info->secondary_capability != 0)
 142                 len += sprintf(page + len, "Secondary Capability: %d\n",
 143                                info->secondary_capability);
 144
 145         return len;
 146 }
 147
 148 #if 0 /* Currently unused */
 149 static int stsi_2_2_1(struct sysinfo_2_2_1 *info, char *page, int len)
 150 {
 151         if (stsi(info, 2, 2, 1) == -ENOSYS)
 152                 return len;
 153
 154         len += sprintf(page + len, "\n");
 155         EBCASC (info->sequence, sizeof(info->sequence));
 156         EBCASC (info->plant, sizeof(info->plant));
 157         len += sprintf(page + len, "Sequence Code of logical CPU: %-16.16s\n",
 158                        info->sequence);
 159         len += sprintf(page + len, "Plant of logical CPU: %-16.16s\n",
 160                        info->plant);
 161         return len;
 162 }
 163 #endif
 164
 165 static int stsi_2_2_2(struct sysinfo_2_2_2 *info, char *page, int len)
 166 {
 167         if (stsi(info, 2, 2, 2) == -ENOSYS)
 168                 return len;
 169
 170         EBCASC (info->name, sizeof(info->name));
 171
 172         len += sprintf(page + len, "\n");
 173         len += sprintf(page + len, "LPAR Number:          %d\n",
 174                        info->lpar_number);
 175
 176         len += sprintf(page + len, "LPAR Characteristics: ");
 177         if (info->characteristics & LPAR_CHAR_DEDICATED)
 178                 len += sprintf(page + len, "Dedicated ");
 179         if (info->characteristics & LPAR_CHAR_SHARED)
 180                 len += sprintf(page + len, "Shared ");
 181         if (info->characteristics & LPAR_CHAR_LIMITED)
 182                 len += sprintf(page + len, "Limited ");
 183         len += sprintf(page + len, "\n");
 184
 185         len += sprintf(page + len, "LPAR Name:            %-8.8s\n",
 186                        info->name);
 187
 188         len += sprintf(page + len, "LPAR Adjustment:      %d\n",
 189                        info->caf);
 190
 191         len += sprintf(page + len, "LPAR CPUs Total:      %d\n",
 192                        info->cpus_total);
 193         len += sprintf(page + len, "LPAR CPUs Configured: %d\n",
 194                        info->cpus_configured);
 195         len += sprintf(page + len, "LPAR CPUs Standby:    %d\n",
 196                        info->cpus_standby);
 197         len += sprintf(page + len, "LPAR CPUs Reserved:   %d\n",
 198                        info->cpus_reserved);
 199         len += sprintf(page + len, "LPAR CPUs Dedicated:  %d\n",
 200                        info->cpus_dedicated);
 201         len += sprintf(page + len, "LPAR CPUs Shared:     %d\n",
 202                        info->cpus_shared);
 203         return len;
 204 }
 205
 206 static int stsi_3_2_2(struct sysinfo_3_2_2 *info, char *page, int len)
 207 {
 208         int i;
 209
 210         if (stsi(info, 3, 2, 2) == -ENOSYS)
 211                 return len;
 212         for (i = 0; i < info->count; i++) {
 213                 EBCASC (info->vm[i].name, sizeof(info->vm[i].name));
 214                 EBCASC (info->vm[i].cpi, sizeof(info->vm[i].cpi));
 215                 len += sprintf(page + len, "\n");
 216                 len += sprintf(page + len, "VM%02d Name:            %-8.8s\n",
 217                                i, info->vm[i].name);
 218                 len += sprintf(page + len, "VM%02d Control Program: %-16.16s\n",
 219                                i, info->vm[i].cpi);
 220
 221                 len += sprintf(page + len, "VM%02d Adjustment:      %d\n",
 222                                i, info->vm[i].caf);
 223
 224                 len += sprintf(page + len, "VM%02d CPUs Total:      %d\n",
 225                                i, info->vm[i].cpus_total);
 226                 len += sprintf(page + len, "VM%02d CPUs Configured: %d\n",
 227                                i, info->vm[i].cpus_configured);
 228                 len += sprintf(page + len, "VM%02d CPUs Standby:    %d\n",
 229                                i, info->vm[i].cpus_standby);
 230                 len += sprintf(page + len, "VM%02d CPUs Reserved:   %d\n",
 231                                i, info->vm[i].cpus_reserved);
 232         }
 233         return len;
 234 }
 235
 236
 237 static int proc_read_sysinfo(char *page, char **start,
 238                              off_t off, int count,
 239                              int *eof, void *data)
 240 {
 241         unsigned long info = get_zeroed_page (GFP_KERNEL);
 242         int level, len;
 243
 244         if (!info)
 245                 return 0;
 246
 247         len = 0;
 248         level = stsi_0();
 249         if (level >= 1)
 250                 len = stsi_1_1_1((struct sysinfo_1_1_1 *) info, page, len);
 251
 252         if (level >= 1)
 253                 len = stsi_1_2_2((struct sysinfo_1_2_2 *) info, page, len);
 254
 255         if (level >= 2)
 256                 len = stsi_2_2_2((struct sysinfo_2_2_2 *) info, page, len);
 257
 258         if (level >= 3)
 259                 len = stsi_3_2_2((struct sysinfo_3_2_2 *) info, page, len);
 260
 261         free_page (info);
 262         return len;
 263 }
 264
 265 static __init int create_proc_sysinfo(void)
 266 {
 267         create_proc_read_entry("sysinfo", 0444, NULL,
 268                                proc_read_sysinfo, NULL);
 269         return 0;
 270 }
 271
 272 __initcall(create_proc_sysinfo);
 273
 274 int get_cpu_capability(unsigned int *capability)
 275 {
 276         struct sysinfo_1_2_2 *info;
 277         int rc;
 278
 279         info = (void *) get_zeroed_page(GFP_KERNEL);
 280         if (!info)
 281                 return -ENOMEM;
 282         rc = stsi(info, 1, 2, 2);
 283         if (rc == -ENOSYS)
 284                 goto out;
 285         rc = 0;
 286         *capability = info->capability;
 287 out:
 288         free_page((unsigned long) info);
 289         return rc;
 290 }
 291
 292 /*
 293  * CPU capability might have changed. Therefore recalculate loops_per_jiffy.
 294  */
 295 void s390_adjust_jiffies(void)
 296 {
 297         struct sysinfo_1_2_2 *info;
 298         const unsigned int fmil = 0x4b189680;   /* 1e7 as 32-bit float. */
 299         FP_DECL_S(SA); FP_DECL_S(SB); FP_DECL_S(SR);
 300         FP_DECL_EX;
 301         unsigned int capability;
 302
 303         info = (void *) get_zeroed_page(GFP_KERNEL);
 304         if (!info)
 305                 return;
 306
 307         if (stsi(info, 1, 2, 2) != -ENOSYS) {
 308                 /*
 309                  * Major sigh. The cpu capability encoding is "special".
 310                  * If the first 9 bits of info->capability are 0 then it
 311                  * is a 32 bit unsigned integer in the range 0 .. 2^23.
 312                  * If the first 9 bits are != 0 then it is a 32 bit float.
 313                  * In addition a lower value indicates a proportionally
 314                  * higher cpu capacity. Bogomips are the other way round.
 315                  * To get to a halfway suitable number we divide 1e7
 316                  * by the cpu capability number. Yes, that means a floating
 317                  * point division .. math-emu here we come :-)
 318                  */
 319                 FP_UNPACK_SP(SA, &fmil);
 320                 if ((info->capability >> 23) == 0)
 321                         FP_FROM_INT_S(SB, info->capability, 32, int);
 322                 else
 323                         FP_UNPACK_SP(SB, &info->capability);
 324                 FP_DIV_S(SR, SA, SB);
 325                 FP_TO_INT_S(capability, SR, 32, 0);
 326         } else
 327                 /*
 328                  * Really old machine without stsi block for basic
 329                  * cpu information. Report 42.0 bogomips.
 330                  */
 331                 capability = 42;
 332         loops_per_jiffy = capability * (500000/HZ);
 333         free_page((unsigned long) info);
 334 }
 335
 336 /*
 337  * calibrate the delay loop
 338  */
 339 void __cpuinit calibrate_delay(void)
 340 {
 341         s390_adjust_jiffies();
 342         /* Print the good old Bogomips line .. */
 343         printk(KERN_DEBUG "Calibrating delay loop (skipped)... "
 344                "%lu.%02lu BogoMIPS preset\n", loops_per_jiffy/(500000/HZ),
 345                (loops_per_jiffy/(5000/HZ)) % 100);
 346 }