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