2 * arch/s390/hypfs/hypfs_diag.c
3 * Hypervisor filesystem for Linux on s390. Diag 204 and 224
6 * Copyright (C) IBM Corp. 2006
7 * Author(s): Michael Holzheu <holzheu@de.ibm.com>
10 #include <linux/types.h>
11 #include <linux/errno.h>
12 #include <linux/string.h>
13 #include <linux/vmalloc.h>
14 #include <asm/ebcdic.h>
17 #define LPAR_NAME_LEN 8 /* lpar name len in diag 204 data */
18 #define CPU_NAME_LEN 16 /* type name len of cpus in diag224 name table */
19 #define TMP_SIZE 64 /* size of temporary buffers */
21 /* diag 204 subcodes */
29 /* The two available diag 204 data formats */
35 /* bit is set in flags, when physical cpu info is included in diag 204 data */
36 #define LPAR_PHYS_FLG 0x80
38 static char *diag224_cpu_names; /* diag 224 name table */
39 static enum diag204_sc diag204_store_sc; /* used subcode for store */
40 static enum diag204_format diag204_info_type; /* used diag 204 data format */
42 static void *diag204_buf; /* 4K aligned buffer for diag204 data */
43 static void *diag204_buf_vmalloc; /* vmalloc pointer for diag204 data */
44 static int diag204_buf_pages; /* number of pages for diag204 data */
47 * DIAG 204 data structures and member access functions.
49 * Since we have two different diag 204 data formats for old and new s390
50 * machines, we do not access the structs directly, but use getter functions for
51 * each struct member instead. This should make the code more readable.
54 /* Time information block */
63 } __attribute__ ((packed));
65 struct x_info_blk_hdr {
74 } __attribute__ ((packed));
76 static inline int info_blk_hdr__size(enum diag204_format type)
78 if (type == INFO_SIMPLE)
79 return sizeof(struct info_blk_hdr);
81 return sizeof(struct x_info_blk_hdr);
84 static inline __u8 info_blk_hdr__npar(enum diag204_format type, void *hdr)
86 if (type == INFO_SIMPLE)
87 return ((struct info_blk_hdr *)hdr)->npar;
89 return ((struct x_info_blk_hdr *)hdr)->npar;
92 static inline __u8 info_blk_hdr__flags(enum diag204_format type, void *hdr)
94 if (type == INFO_SIMPLE)
95 return ((struct info_blk_hdr *)hdr)->flags;
97 return ((struct x_info_blk_hdr *)hdr)->flags;
100 static inline __u16 info_blk_hdr__pcpus(enum diag204_format type, void *hdr)
102 if (type == INFO_SIMPLE)
103 return ((struct info_blk_hdr *)hdr)->phys_cpus;
105 return ((struct x_info_blk_hdr *)hdr)->phys_cpus;
108 /* Partition header */
114 char part_name[LPAR_NAME_LEN];
115 } __attribute__ ((packed));
123 char part_name[LPAR_NAME_LEN];
133 } __attribute__ ((packed));
135 static inline int part_hdr__size(enum diag204_format type)
137 if (type == INFO_SIMPLE)
138 return sizeof(struct part_hdr);
140 return sizeof(struct x_part_hdr);
143 static inline __u8 part_hdr__rcpus(enum diag204_format type, void *hdr)
145 if (type == INFO_SIMPLE)
146 return ((struct part_hdr *)hdr)->cpus;
148 return ((struct x_part_hdr *)hdr)->rcpus;
151 static inline void part_hdr__part_name(enum diag204_format type, void *hdr,
154 if (type == INFO_SIMPLE)
155 memcpy(name, ((struct part_hdr *)hdr)->part_name,
158 memcpy(name, ((struct x_part_hdr *)hdr)->part_name,
160 EBCASC(name, LPAR_NAME_LEN);
161 name[LPAR_NAME_LEN] = 0;
173 } __attribute__ ((packed));
192 } __attribute__ ((packed));
196 static inline int cpu_info__size(enum diag204_format type)
198 if (type == INFO_SIMPLE)
199 return sizeof(struct cpu_info);
201 return sizeof(struct x_cpu_info);
204 static inline __u8 cpu_info__ctidx(enum diag204_format type, void *hdr)
206 if (type == INFO_SIMPLE)
207 return ((struct cpu_info *)hdr)->ctidx;
209 return ((struct x_cpu_info *)hdr)->ctidx;
212 static inline __u16 cpu_info__cpu_addr(enum diag204_format type, void *hdr)
214 if (type == INFO_SIMPLE)
215 return ((struct cpu_info *)hdr)->cpu_addr;
217 return ((struct x_cpu_info *)hdr)->cpu_addr;
220 static inline __u64 cpu_info__acc_time(enum diag204_format type, void *hdr)
222 if (type == INFO_SIMPLE)
223 return ((struct cpu_info *)hdr)->acc_time;
225 return ((struct x_cpu_info *)hdr)->acc_time;
228 static inline __u64 cpu_info__lp_time(enum diag204_format type, void *hdr)
230 if (type == INFO_SIMPLE)
231 return ((struct cpu_info *)hdr)->lp_time;
233 return ((struct x_cpu_info *)hdr)->lp_time;
236 static inline __u64 cpu_info__online_time(enum diag204_format type, void *hdr)
238 if (type == INFO_SIMPLE)
239 return 0; /* online_time not available in simple info */
241 return ((struct x_cpu_info *)hdr)->online_time;
244 /* Physical header */
251 } __attribute__ ((packed));
259 } __attribute__ ((packed));
261 static inline int phys_hdr__size(enum diag204_format type)
263 if (type == INFO_SIMPLE)
264 return sizeof(struct phys_hdr);
266 return sizeof(struct x_phys_hdr);
269 static inline __u8 phys_hdr__cpus(enum diag204_format type, void *hdr)
271 if (type == INFO_SIMPLE)
272 return ((struct phys_hdr *)hdr)->cpus;
274 return ((struct x_phys_hdr *)hdr)->cpus;
277 /* Physical CPU info block */
286 } __attribute__ ((packed));
295 } __attribute__ ((packed));
297 static inline int phys_cpu__size(enum diag204_format type)
299 if (type == INFO_SIMPLE)
300 return sizeof(struct phys_cpu);
302 return sizeof(struct x_phys_cpu);
305 static inline __u16 phys_cpu__cpu_addr(enum diag204_format type, void *hdr)
307 if (type == INFO_SIMPLE)
308 return ((struct phys_cpu *)hdr)->cpu_addr;
310 return ((struct x_phys_cpu *)hdr)->cpu_addr;
313 static inline __u64 phys_cpu__mgm_time(enum diag204_format type, void *hdr)
315 if (type == INFO_SIMPLE)
316 return ((struct phys_cpu *)hdr)->mgm_time;
318 return ((struct x_phys_cpu *)hdr)->mgm_time;
321 static inline __u64 phys_cpu__ctidx(enum diag204_format type, void *hdr)
323 if (type == INFO_SIMPLE)
324 return ((struct phys_cpu *)hdr)->ctidx;
326 return ((struct x_phys_cpu *)hdr)->ctidx;
329 /* Diagnose 204 functions */
331 static int diag204(unsigned long subcode, unsigned long size, void *addr)
333 register unsigned long _subcode asm("0") = subcode;
334 register unsigned long _size asm("1") = size;
336 asm volatile (" diag %2,%0,0x204\n"
337 "0: \n" ".section __ex_table,\"a\"\n"
345 ".previous":"+d" (_subcode), "+d"(_size)
355 * For the old diag subcode 4 with simple data format we have to use real
356 * memory. If we use subcode 6 or 7 with extended data format, we can (and
357 * should) use vmalloc, since we need a lot of memory in that case. Currently
361 static void diag204_free_buffer(void)
365 if (diag204_buf_vmalloc) {
366 vfree(diag204_buf_vmalloc);
367 diag204_buf_vmalloc = NULL;
369 free_pages((unsigned long) diag204_buf, 0);
371 diag204_buf_pages = 0;
375 static void *diag204_alloc_vbuf(int pages)
377 /* The buffer has to be page aligned! */
378 diag204_buf_vmalloc = vmalloc(PAGE_SIZE * (pages + 1));
379 if (!diag204_buf_vmalloc)
380 return ERR_PTR(-ENOMEM);
381 diag204_buf = (void*)((unsigned long)diag204_buf_vmalloc
382 & ~0xfffUL) + 0x1000;
383 diag204_buf_pages = pages;
387 static void *diag204_alloc_rbuf(void)
389 diag204_buf = (void*)__get_free_pages(GFP_KERNEL,0);
391 return ERR_PTR(-ENOMEM);
392 diag204_buf_pages = 1;
396 static void *diag204_get_buffer(enum diag204_format fmt, int *pages)
399 *pages = diag204_buf_pages;
402 if (fmt == INFO_SIMPLE) {
404 return diag204_alloc_rbuf();
405 } else {/* INFO_EXT */
406 *pages = diag204((unsigned long)SUBC_RSI |
407 (unsigned long)INFO_EXT, 0, NULL);
409 return ERR_PTR(-ENOSYS);
411 return diag204_alloc_vbuf(*pages);
416 * diag204_probe() has to find out, which type of diagnose 204 implementation
417 * we have on our machine. Currently there are three possible scanarios:
418 * - subcode 4 + simple data format (only one page)
419 * - subcode 4-6 + extended data format
420 * - subcode 4-7 + extended data format
422 * Subcode 5 is used to retrieve the size of the data, provided by subcodes
423 * 6 and 7. Subcode 7 basically has the same function as subcode 6. In addition
424 * to subcode 6 it provides also information about secondary cpus.
425 * In order to get as much information as possible, we first try
426 * subcode 7, then 6 and if both fail, we use subcode 4.
429 static int diag204_probe(void)
434 buf = diag204_get_buffer(INFO_EXT, &pages);
436 if (diag204((unsigned long)SUBC_STIB7 |
437 (unsigned long)INFO_EXT, pages, buf) >= 0) {
438 diag204_store_sc = SUBC_STIB7;
439 diag204_info_type = INFO_EXT;
442 if (diag204((unsigned long)SUBC_STIB6 |
443 (unsigned long)INFO_EXT, pages, buf) >= 0) {
444 diag204_store_sc = SUBC_STIB7;
445 diag204_info_type = INFO_EXT;
448 diag204_free_buffer();
451 /* subcodes 6 and 7 failed, now try subcode 4 */
453 buf = diag204_get_buffer(INFO_SIMPLE, &pages);
458 if (diag204((unsigned long)SUBC_STIB4 |
459 (unsigned long)INFO_SIMPLE, pages, buf) >= 0) {
460 diag204_store_sc = SUBC_STIB4;
461 diag204_info_type = INFO_SIMPLE;
470 diag204_free_buffer();
475 static void *diag204_store(void)
480 buf = diag204_get_buffer(diag204_info_type, &pages);
483 if (diag204((unsigned long)diag204_store_sc |
484 (unsigned long)diag204_info_type, pages, buf) < 0)
485 return ERR_PTR(-ENOSYS);
490 /* Diagnose 224 functions */
492 static void diag224(void *ptr)
494 asm volatile(" diag %0,%1,0x224\n"
495 : :"d" (0), "d"(ptr) : "memory");
498 static int diag224_get_name_table(void)
500 /* memory must be below 2GB */
501 diag224_cpu_names = kmalloc(PAGE_SIZE, GFP_KERNEL | GFP_DMA);
502 if (!diag224_cpu_names)
504 diag224(diag224_cpu_names);
505 EBCASC(diag224_cpu_names + 16, (*diag224_cpu_names + 1) * 16);
509 static void diag224_delete_name_table(void)
511 kfree(diag224_cpu_names);
514 static int diag224_idx2name(int index, char *name)
516 memcpy(name, diag224_cpu_names + ((index + 1) * CPU_NAME_LEN),
518 name[CPU_NAME_LEN] = 0;
523 __init int hypfs_diag_init(void)
527 if (diag204_probe()) {
528 printk(KERN_ERR "hypfs: diag 204 not working.");
531 rc = diag224_get_name_table();
533 diag224_delete_name_table();
534 printk(KERN_ERR "hypfs: could not get name table.\n");
539 void hypfs_diag_exit(void)
541 diag224_delete_name_table();
542 diag204_free_buffer();
546 * Functions to create the directory structure
547 * *******************************************
550 static int hypfs_create_cpu_files(struct super_block *sb,
551 struct dentry *cpus_dir, void *cpu_info)
553 struct dentry *cpu_dir;
554 char buffer[TMP_SIZE];
557 snprintf(buffer, TMP_SIZE, "%d", cpu_info__cpu_addr(diag204_info_type,
559 cpu_dir = hypfs_mkdir(sb, cpus_dir, buffer);
560 rc = hypfs_create_u64(sb, cpu_dir, "mgmtime",
561 cpu_info__acc_time(diag204_info_type, cpu_info) -
562 cpu_info__lp_time(diag204_info_type, cpu_info));
565 rc = hypfs_create_u64(sb, cpu_dir, "cputime",
566 cpu_info__lp_time(diag204_info_type, cpu_info));
569 if (diag204_info_type == INFO_EXT) {
570 rc = hypfs_create_u64(sb, cpu_dir, "onlinetime",
571 cpu_info__online_time(diag204_info_type,
576 diag224_idx2name(cpu_info__ctidx(diag204_info_type, cpu_info), buffer);
577 rc = hypfs_create_str(sb, cpu_dir, "type", buffer);
583 static void *hypfs_create_lpar_files(struct super_block *sb,
584 struct dentry *systems_dir, void *part_hdr)
586 struct dentry *cpus_dir;
587 struct dentry *lpar_dir;
588 char lpar_name[LPAR_NAME_LEN + 1];
592 part_hdr__part_name(diag204_info_type, part_hdr, lpar_name);
593 lpar_name[LPAR_NAME_LEN] = 0;
594 lpar_dir = hypfs_mkdir(sb, systems_dir, lpar_name);
595 if (IS_ERR(lpar_dir))
597 cpus_dir = hypfs_mkdir(sb, lpar_dir, "cpus");
598 if (IS_ERR(cpus_dir))
600 cpu_info = part_hdr + part_hdr__size(diag204_info_type);
601 for (i = 0; i < part_hdr__rcpus(diag204_info_type, part_hdr); i++) {
603 rc = hypfs_create_cpu_files(sb, cpus_dir, cpu_info);
606 cpu_info += cpu_info__size(diag204_info_type);
611 static int hypfs_create_phys_cpu_files(struct super_block *sb,
612 struct dentry *cpus_dir, void *cpu_info)
614 struct dentry *cpu_dir;
615 char buffer[TMP_SIZE];
618 snprintf(buffer, TMP_SIZE, "%i", phys_cpu__cpu_addr(diag204_info_type,
620 cpu_dir = hypfs_mkdir(sb, cpus_dir, buffer);
622 return PTR_ERR(cpu_dir);
623 rc = hypfs_create_u64(sb, cpu_dir, "mgmtime",
624 phys_cpu__mgm_time(diag204_info_type, cpu_info));
627 diag224_idx2name(phys_cpu__ctidx(diag204_info_type, cpu_info), buffer);
628 rc = hypfs_create_str(sb, cpu_dir, "type", buffer);
634 static void *hypfs_create_phys_files(struct super_block *sb,
635 struct dentry *parent_dir, void *phys_hdr)
639 struct dentry *cpus_dir;
641 cpus_dir = hypfs_mkdir(sb, parent_dir, "cpus");
642 if (IS_ERR(cpus_dir))
644 cpu_info = phys_hdr + phys_hdr__size(diag204_info_type);
645 for (i = 0; i < phys_hdr__cpus(diag204_info_type, phys_hdr); i++) {
647 rc = hypfs_create_phys_cpu_files(sb, cpus_dir, cpu_info);
650 cpu_info += phys_cpu__size(diag204_info_type);
655 int hypfs_diag_create_files(struct super_block *sb, struct dentry *root)
657 struct dentry *systems_dir, *hyp_dir;
658 void *time_hdr, *part_hdr;
662 buffer = diag204_store();
664 return PTR_ERR(buffer);
666 systems_dir = hypfs_mkdir(sb, root, "systems");
667 if (IS_ERR(systems_dir)) {
668 rc = PTR_ERR(systems_dir);
671 time_hdr = (struct x_info_blk_hdr *)buffer;
672 part_hdr = time_hdr + info_blk_hdr__size(diag204_info_type);
673 for (i = 0; i < info_blk_hdr__npar(diag204_info_type, time_hdr); i++) {
674 part_hdr = hypfs_create_lpar_files(sb, systems_dir, part_hdr);
675 if (IS_ERR(part_hdr)) {
676 rc = PTR_ERR(part_hdr);
680 if (info_blk_hdr__flags(diag204_info_type, time_hdr) & LPAR_PHYS_FLG) {
681 ptr = hypfs_create_phys_files(sb, root, part_hdr);
687 hyp_dir = hypfs_mkdir(sb, root, "hyp");
688 if (IS_ERR(hyp_dir)) {
689 rc = PTR_ERR(hyp_dir);
692 ptr = hypfs_create_str(sb, hyp_dir, "type", "LPAR Hypervisor");