Linux kernel & device driver programming

Cross-Referenced Linux and Device Driver Code

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Version: [ 2.6.11.8 ] [ 2.6.25 ] [ 2.6.25.8 ] [ 2.6.31.13 ] Architecture: [ i386 ]
  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 
 15 /* Sigh, math-emu. Don't ask. */
 16 #include <asm/sfp-util.h>
 17 #include <math-emu/soft-fp.h>
 18 #include <math-emu/single.h>
 19 
 20 struct sysinfo_1_1_1 {
 21         char reserved_0[32];
 22         char manufacturer[16];
 23         char type[4];
 24         char reserved_1[12];
 25         char model_capacity[16];
 26         char sequence[16];
 27         char plant[4];
 28         char model[16];
 29 };
 30 
 31 struct sysinfo_1_2_1 {
 32         char reserved_0[80];
 33         char sequence[16];
 34         char plant[4];
 35         char reserved_1[2];
 36         unsigned short cpu_address;
 37 };
 38 
 39 struct sysinfo_1_2_2 {
 40         char format;
 41         char reserved_0[1];
 42         unsigned short acc_offset;
 43         char reserved_1[24];
 44         unsigned int secondary_capability;
 45         unsigned int capability;
 46         unsigned short cpus_total;
 47         unsigned short cpus_configured;
 48         unsigned short cpus_standby;
 49         unsigned short cpus_reserved;
 50         unsigned short adjustment[0];
 51 };
 52 
 53 struct sysinfo_1_2_2_extension {
 54         unsigned int alt_capability;
 55         unsigned short alt_adjustment[0];
 56 };
 57 
 58 struct sysinfo_2_2_1 {
 59         char reserved_0[80];
 60         char sequence[16];
 61         char plant[4];
 62         unsigned short cpu_id;
 63         unsigned short cpu_address;
 64 };
 65 
 66 struct sysinfo_2_2_2 {
 67         char reserved_0[32];
 68         unsigned short lpar_number;
 69         char reserved_1;
 70         unsigned char characteristics;
 71         unsigned short cpus_total;
 72         unsigned short cpus_configured;
 73         unsigned short cpus_standby;
 74         unsigned short cpus_reserved;
 75         char name[8];
 76         unsigned int caf;
 77         char reserved_2[16];
 78         unsigned short cpus_dedicated;
 79         unsigned short cpus_shared;
 80 };
 81 
 82 #define LPAR_CHAR_DEDICATED     (1 << 7)
 83 #define LPAR_CHAR_SHARED        (1 << 6)
 84 #define LPAR_CHAR_LIMITED       (1 << 5)
 85 
 86 struct sysinfo_3_2_2 {
 87         char reserved_0[31];
 88         unsigned char count;
 89         struct {
 90                 char reserved_0[4];
 91                 unsigned short cpus_total;
 92                 unsigned short cpus_configured;
 93                 unsigned short cpus_standby;
 94                 unsigned short cpus_reserved;
 95                 char name[8];
 96                 unsigned int caf;
 97                 char cpi[16];
 98                 char reserved_1[24];
 99 
100         } vm[8];
101 };
102 
103 static inline int stsi(void *sysinfo, int fc, int sel1, int sel2)
104 {
105         register int r0 asm("") = (fc << 28) | sel1;
106         register int r1 asm("1") = sel2;
107 
108         asm volatile(
109                 "   stsi 0(%2)\n"
110                 "0: jz   2f\n"
111                 "1: lhi  %0,%3\n"
112                 "2:\n"
113                 EX_TABLE(0b,1b)
114                 : "+d" (r0) : "d" (r1), "a" (sysinfo), "K" (-ENOSYS)
115                 : "cc", "memory" );
116         return r0;
117 }
118 
119 static inline int stsi_0(void)
120 {
121         int rc = stsi (NULL, 0, 0, 0);
122         return rc == -ENOSYS ? rc : (((unsigned int) rc) >> 28);
123 }
124 
125 static int stsi_1_1_1(struct sysinfo_1_1_1 *info, char *page, int len)
126 {
127         if (stsi(info, 1, 1, 1) == -ENOSYS)
128                 return len;
129 
130         EBCASC(info->manufacturer, sizeof(info->manufacturer));
131         EBCASC(info->type, sizeof(info->type));
132         EBCASC(info->model, sizeof(info->model));
133         EBCASC(info->sequence, sizeof(info->sequence));
134         EBCASC(info->plant, sizeof(info->plant));
135         EBCASC(info->model_capacity, sizeof(info->model_capacity));
136         len += sprintf(page + len, "Manufacturer:         %-16.16s\n",
137                        info->manufacturer);
138         len += sprintf(page + len, "Type:                 %-4.4s\n",
139                        info->type);
140         if (info->model[0] != '\0')
141                 /*
142                  * Sigh: the model field has been renamed with System z9
143                  * to model_capacity and a new model field has been added
144                  * after the plant field. To avoid confusing older programs
145                  * the "Model:" prints "model_capacity model" or just
146                  * "model_capacity" if the model string is empty .
147                  */
148                 len += sprintf(page + len,
149                                "Model:                %-16.16s %-16.16s\n",
150                                info->model_capacity, info->model);
151         else
152                 len += sprintf(page + len, "Model:                %-16.16s\n",
153                                info->model_capacity);
154         len += sprintf(page + len, "Sequence Code:        %-16.16s\n",
155                        info->sequence);
156         len += sprintf(page + len, "Plant:                %-4.4s\n",
157                        info->plant);
158         len += sprintf(page + len, "Model Capacity:       %-16.16s\n",
159                        info->model_capacity);
160         return len;
161 }
162 
163 #if 0 /* Currently unused */
164 static int stsi_1_2_1(struct sysinfo_1_2_1 *info, char *page, int len)
165 {
166         if (stsi(info, 1, 2, 1) == -ENOSYS)
167                 return len;
168 
169         len += sprintf(page + len, "\n");
170         EBCASC(info->sequence, sizeof(info->sequence));
171         EBCASC(info->plant, sizeof(info->plant));
172         len += sprintf(page + len, "Sequence Code of CPU: %-16.16s\n",
173                        info->sequence);
174         len += sprintf(page + len, "Plant of CPU:         %-16.16s\n",
175                        info->plant);
176         return len;
177 }
178 #endif
179 
180 static int stsi_1_2_2(struct sysinfo_1_2_2 *info, char *page, int len)
181 {
182         struct sysinfo_1_2_2_extension *ext;
183         int i;
184 
185         if (stsi(info, 1, 2, 2) == -ENOSYS)
186                 return len;
187         ext = (struct sysinfo_1_2_2_extension *)
188                 ((unsigned long) info + info->acc_offset);
189 
190         len += sprintf(page + len, "\n");
191         len += sprintf(page + len, "CPUs Total:           %d\n",
192                        info->cpus_total);
193         len += sprintf(page + len, "CPUs Configured:      %d\n",
194                        info->cpus_configured);
195         len += sprintf(page + len, "CPUs Standby:         %d\n",
196                        info->cpus_standby);
197         len += sprintf(page + len, "CPUs Reserved:        %d\n",
198                        info->cpus_reserved);
199 
200         if (info->format == 1) {
201                 /*
202                  * Sigh 2. According to the specification the alternate
203                  * capability field is a 32 bit floating point number
204                  * if the higher order 8 bits are not zero. Printing
205                  * a floating point number in the kernel is a no-no,
206                  * always print the number as 32 bit unsigned integer.
207                  * The user-space needs to know about the strange
208                  * encoding of the alternate cpu capability.
209                  */
210                 len += sprintf(page + len, "Capability:           %u %u\n",
211                                info->capability, ext->alt_capability);
212                 for (i = 2; i <= info->cpus_total; i++)
213                         len += sprintf(page + len,
214                                        "Adjustment %02d-way:    %u %u\n",
215                                        i, info->adjustment[i-2],
216                                        ext->alt_adjustment[i-2]);
217 
218         } else {
219                 len += sprintf(page + len, "Capability:           %u\n",
220                                info->capability);
221                 for (i = 2; i <= info->cpus_total; i++)
222                         len += sprintf(page + len,
223                                        "Adjustment %02d-way:    %u\n",
224                                        i, info->adjustment[i-2]);
225         }
226 
227         if (info->secondary_capability != 0)
228                 len += sprintf(page + len, "Secondary Capability: %d\n",
229                                info->secondary_capability);
230 
231         return len;
232 }
233 
234 #if 0 /* Currently unused */
235 static int stsi_2_2_1(struct sysinfo_2_2_1 *info, char *page, int len)
236 {
237         if (stsi(info, 2, 2, 1) == -ENOSYS)
238                 return len;
239 
240         len += sprintf(page + len, "\n");
241         EBCASC (info->sequence, sizeof(info->sequence));
242         EBCASC (info->plant, sizeof(info->plant));
243         len += sprintf(page + len, "Sequence Code of logical CPU: %-16.16s\n",
244                        info->sequence);
245         len += sprintf(page + len, "Plant of logical CPU: %-16.16s\n",
246                        info->plant);
247         return len;
248 }
249 #endif
250 
251 static int stsi_2_2_2(struct sysinfo_2_2_2 *info, char *page, int len)
252 {
253         if (stsi(info, 2, 2, 2) == -ENOSYS)
254                 return len;
255 
256         EBCASC (info->name, sizeof(info->name));
257 
258         len += sprintf(page + len, "\n");
259         len += sprintf(page + len, "LPAR Number:          %d\n",
260                        info->lpar_number);
261 
262         len += sprintf(page + len, "LPAR Characteristics: ");
263         if (info->characteristics & LPAR_CHAR_DEDICATED)
264                 len += sprintf(page + len, "Dedicated ");
265         if (info->characteristics & LPAR_CHAR_SHARED)
266                 len += sprintf(page + len, "Shared ");
267         if (info->characteristics & LPAR_CHAR_LIMITED)
268                 len += sprintf(page + len, "Limited ");
269         len += sprintf(page + len, "\n");
270 
271         len += sprintf(page + len, "LPAR Name:            %-8.8s\n",
272                        info->name);
273 
274         len += sprintf(page + len, "LPAR Adjustment:      %d\n",
275                        info->caf);
276 
277         len += sprintf(page + len, "LPAR CPUs Total:      %d\n",
278                        info->cpus_total);
279         len += sprintf(page + len, "LPAR CPUs Configured: %d\n",
280                        info->cpus_configured);
281         len += sprintf(page + len, "LPAR CPUs Standby:    %d\n",
282                        info->cpus_standby);
283         len += sprintf(page + len, "LPAR CPUs Reserved:   %d\n",
284                        info->cpus_reserved);
285         len += sprintf(page + len, "LPAR CPUs Dedicated:  %d\n",
286                        info->cpus_dedicated);
287         len += sprintf(page + len, "LPAR CPUs Shared:     %d\n",
288                        info->cpus_shared);
289         return len;
290 }
291 
292 static int stsi_3_2_2(struct sysinfo_3_2_2 *info, char *page, int len)
293 {
294         int i;
295 
296         if (stsi(info, 3, 2, 2) == -ENOSYS)
297                 return len;
298         for (i = 0; i < info->count; i++) {
299                 EBCASC (info->vm[i].name, sizeof(info->vm[i].name));
300                 EBCASC (info->vm[i].cpi, sizeof(info->vm[i].cpi));
301                 len += sprintf(page + len, "\n");
302                 len += sprintf(page + len, "VM%02d Name:            %-8.8s\n",
303                                i, info->vm[i].name);
304                 len += sprintf(page + len, "VM%02d Control Program: %-16.16s\n",
305                                i, info->vm[i].cpi);
306 
307                 len += sprintf(page + len, "VM%02d Adjustment:      %d\n",
308                                i, info->vm[i].caf);
309 
310                 len += sprintf(page + len, "VM%02d CPUs Total:      %d\n",
311                                i, info->vm[i].cpus_total);
312                 len += sprintf(page + len, "VM%02d CPUs Configured: %d\n",
313                                i, info->vm[i].cpus_configured);
314                 len += sprintf(page + len, "VM%02d CPUs Standby:    %d\n",
315                                i, info->vm[i].cpus_standby);
316                 len += sprintf(page + len, "VM%02d CPUs Reserved:   %d\n",
317                                i, info->vm[i].cpus_reserved);
318         }
319         return len;
320 }
321 
322 
323 static int proc_read_sysinfo(char *page, char **start,
324                              off_t off, int count,
325                              int *eof, void *data)
326 {
327         unsigned long info = get_zeroed_page (GFP_KERNEL);
328         int level, len;
329         
330         if (!info)
331                 return 0;
332 
333         len = 0;
334         level = stsi_0();
335         if (level >= 1)
336                 len = stsi_1_1_1((struct sysinfo_1_1_1 *) info, page, len);
337 
338         if (level >= 1)
339                 len = stsi_1_2_2((struct sysinfo_1_2_2 *) info, page, len);
340 
341         if (level >= 2)
342                 len = stsi_2_2_2((struct sysinfo_2_2_2 *) info, page, len);
343 
344         if (level >= 3)
345                 len = stsi_3_2_2((struct sysinfo_3_2_2 *) info, page, len);
346 
347         free_page (info);
348         return len;
349 }
350 
351 static __init int create_proc_sysinfo(void)
352 {
353         create_proc_read_entry("sysinfo", 0444, NULL,
354                                proc_read_sysinfo, NULL);
355         return 0;
356 }
357 
358 __initcall(create_proc_sysinfo);
359 
360 int get_cpu_capability(unsigned int *capability)
361 {
362         struct sysinfo_1_2_2 *info;
363         int rc;
364 
365         info = (void *) get_zeroed_page(GFP_KERNEL);
366         if (!info)
367                 return -ENOMEM;
368         rc = stsi(info, 1, 2, 2);
369         if (rc == -ENOSYS)
370                 goto out;
371         rc = 0;
372         *capability = info->capability;
373 out:
374         free_page((unsigned long) info);
375         return rc;
376 }
377 
378 /*
379  * CPU capability might have changed. Therefore recalculate loops_per_jiffy.
380  */
381 void s390_adjust_jiffies(void)
382 {
383         struct sysinfo_1_2_2 *info;
384         const unsigned int fmil = 0x4b189680;   /* 1e7 as 32-bit float. */
385         FP_DECL_S(SA); FP_DECL_S(SB); FP_DECL_S(SR);
386         FP_DECL_EX;
387         unsigned int capability;
388 
389         info = (void *) get_zeroed_page(GFP_KERNEL);
390         if (!info)
391                 return;
392 
393         if (stsi(info, 1, 2, 2) != -ENOSYS) {
394                 /*
395                  * Major sigh. The cpu capability encoding is "special".
396                  * If the first 9 bits of info->capability are 0 then it
397                  * is a 32 bit unsigned integer in the range 0 .. 2^23.
398                  * If the first 9 bits are != 0 then it is a 32 bit float.
399                  * In addition a lower value indicates a proportionally
400                  * higher cpu capacity. Bogomips are the other way round.
401                  * To get to a halfway suitable number we divide 1e7
402                  * by the cpu capability number. Yes, that means a floating
403                  * point division .. math-emu here we come :-)
404                  */
405                 FP_UNPACK_SP(SA, &fmil);
406                 if ((info->capability >> 23) == 0)
407                         FP_FROM_INT_S(SB, info->capability, 32, int);
408                 else
409                         FP_UNPACK_SP(SB, &info->capability);
410                 FP_DIV_S(SR, SA, SB);
411                 FP_TO_INT_S(capability, SR, 32, 0);
412         } else
413                 /*
414                  * Really old machine without stsi block for basic
415                  * cpu information. Report 42.0 bogomips.
416                  */
417                 capability = 42;
418         loops_per_jiffy = capability * (500000/HZ);
419         free_page((unsigned long) info);
420 }
421 
422 /*
423  * calibrate the delay loop
424  */
425 void __cpuinit calibrate_delay(void)
426 {
427         s390_adjust_jiffies();
428         /* Print the good old Bogomips line .. */
429         printk(KERN_DEBUG "Calibrating delay loop (skipped)... "
430                "%lu.%02lu BogoMIPS preset\n", loops_per_jiffy/(500000/HZ),
431                (loops_per_jiffy/(5000/HZ)) % 100);
432 }
433 
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