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-rw-r--r--arch/s390/hypfs/Makefile7
-rw-r--r--arch/s390/hypfs/hypfs.h30
-rw-r--r--arch/s390/hypfs/hypfs_diag.c696
-rw-r--r--arch/s390/hypfs/hypfs_diag.h16
-rw-r--r--arch/s390/hypfs/inode.c492
5 files changed, 1241 insertions, 0 deletions
diff --git a/arch/s390/hypfs/Makefile b/arch/s390/hypfs/Makefile
new file mode 100644
index 000000000000..f4b00cd81f7c
--- /dev/null
+++ b/arch/s390/hypfs/Makefile
@@ -0,0 +1,7 @@
1#
2# Makefile for the linux hypfs filesystem routines.
3#
4
5obj-$(CONFIG_S390_HYPFS_FS) += s390_hypfs.o
6
7s390_hypfs-objs := inode.o hypfs_diag.o
diff --git a/arch/s390/hypfs/hypfs.h b/arch/s390/hypfs/hypfs.h
new file mode 100644
index 000000000000..ea5567be00fc
--- /dev/null
+++ b/arch/s390/hypfs/hypfs.h
@@ -0,0 +1,30 @@
1/*
2 * fs/hypfs/hypfs.h
3 * Hypervisor filesystem for Linux on s390.
4 *
5 * Copyright (C) IBM Corp. 2006
6 * Author(s): Michael Holzheu <holzheu@de.ibm.com>
7 */
8
9#ifndef _HYPFS_H_
10#define _HYPFS_H_
11
12#include <linux/fs.h>
13#include <linux/types.h>
14
15#define REG_FILE_MODE 0440
16#define UPDATE_FILE_MODE 0220
17#define DIR_MODE 0550
18
19extern struct dentry *hypfs_mkdir(struct super_block *sb, struct dentry *parent,
20 const char *name);
21
22extern struct dentry *hypfs_create_u64(struct super_block *sb,
23 struct dentry *dir, const char *name,
24 __u64 value);
25
26extern struct dentry *hypfs_create_str(struct super_block *sb,
27 struct dentry *dir, const char *name,
28 char *string);
29
30#endif /* _HYPFS_H_ */
diff --git a/arch/s390/hypfs/hypfs_diag.c b/arch/s390/hypfs/hypfs_diag.c
new file mode 100644
index 000000000000..efa74af7f04a
--- /dev/null
+++ b/arch/s390/hypfs/hypfs_diag.c
@@ -0,0 +1,696 @@
1/*
2 * fs/hypfs/hypfs_diag.c
3 * Hypervisor filesystem for Linux on s390. Diag 204 and 224
4 * implementation.
5 *
6 * Copyright (C) IBM Corp. 2006
7 * Author(s): Michael Holzheu <holzheu@de.ibm.com>
8 */
9
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>
15#include "hypfs.h"
16
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 */
20
21/* diag 204 subcodes */
22enum diag204_sc {
23 SUBC_STIB4 = 4,
24 SUBC_RSI = 5,
25 SUBC_STIB6 = 6,
26 SUBC_STIB7 = 7
27};
28
29/* The two available diag 204 data formats */
30enum diag204_format {
31 INFO_SIMPLE = 0,
32 INFO_EXT = 0x00010000
33};
34
35/* bit is set in flags, when physical cpu info is included in diag 204 data */
36#define LPAR_PHYS_FLG 0x80
37
38static char *diag224_cpu_names; /* diag 224 name table */
39static enum diag204_sc diag204_store_sc; /* used subcode for store */
40static enum diag204_format diag204_info_type; /* used diag 204 data format */
41
42static void *diag204_buf; /* 4K aligned buffer for diag204 data */
43static void *diag204_buf_vmalloc; /* vmalloc pointer for diag204 data */
44static int diag204_buf_pages; /* number of pages for diag204 data */
45
46/*
47 * DIAG 204 data structures and member access functions.
48 *
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.
52 */
53
54/* Time information block */
55
56struct info_blk_hdr {
57 __u8 npar;
58 __u8 flags;
59 __u16 tslice;
60 __u16 phys_cpus;
61 __u16 this_part;
62 __u64 curtod;
63} __attribute__ ((packed));
64
65struct x_info_blk_hdr {
66 __u8 npar;
67 __u8 flags;
68 __u16 tslice;
69 __u16 phys_cpus;
70 __u16 this_part;
71 __u64 curtod1;
72 __u64 curtod2;
73 char reserved[40];
74} __attribute__ ((packed));
75
76static inline int info_blk_hdr__size(enum diag204_format type)
77{
78 if (type == INFO_SIMPLE)
79 return sizeof(struct info_blk_hdr);
80 else /* INFO_EXT */
81 return sizeof(struct x_info_blk_hdr);
82}
83
84static inline __u8 info_blk_hdr__npar(enum diag204_format type, void *hdr)
85{
86 if (type == INFO_SIMPLE)
87 return ((struct info_blk_hdr *)hdr)->npar;
88 else /* INFO_EXT */
89 return ((struct x_info_blk_hdr *)hdr)->npar;
90}
91
92static inline __u8 info_blk_hdr__flags(enum diag204_format type, void *hdr)
93{
94 if (type == INFO_SIMPLE)
95 return ((struct info_blk_hdr *)hdr)->flags;
96 else /* INFO_EXT */
97 return ((struct x_info_blk_hdr *)hdr)->flags;
98}
99
100static inline __u16 info_blk_hdr__pcpus(enum diag204_format type, void *hdr)
101{
102 if (type == INFO_SIMPLE)
103 return ((struct info_blk_hdr *)hdr)->phys_cpus;
104 else /* INFO_EXT */
105 return ((struct x_info_blk_hdr *)hdr)->phys_cpus;
106}
107
108/* Partition header */
109
110struct part_hdr {
111 __u8 pn;
112 __u8 cpus;
113 char reserved[6];
114 char part_name[LPAR_NAME_LEN];
115} __attribute__ ((packed));
116
117struct x_part_hdr {
118 __u8 pn;
119 __u8 cpus;
120 __u8 rcpus;
121 __u8 pflag;
122 __u32 mlu;
123 char part_name[LPAR_NAME_LEN];
124 char lpc_name[8];
125 char os_name[8];
126 __u64 online_cs;
127 __u64 online_es;
128 __u8 upid;
129 char reserved1[3];
130 __u32 group_mlu;
131 char group_name[8];
132 char reserved2[32];
133} __attribute__ ((packed));
134
135static inline int part_hdr__size(enum diag204_format type)
136{
137 if (type == INFO_SIMPLE)
138 return sizeof(struct part_hdr);
139 else /* INFO_EXT */
140 return sizeof(struct x_part_hdr);
141}
142
143static inline __u8 part_hdr__rcpus(enum diag204_format type, void *hdr)
144{
145 if (type == INFO_SIMPLE)
146 return ((struct part_hdr *)hdr)->cpus;
147 else /* INFO_EXT */
148 return ((struct x_part_hdr *)hdr)->rcpus;
149}
150
151static inline void part_hdr__part_name(enum diag204_format type, void *hdr,
152 char *name)
153{
154 if (type == INFO_SIMPLE)
155 memcpy(name, ((struct part_hdr *)hdr)->part_name,
156 LPAR_NAME_LEN);
157 else /* INFO_EXT */
158 memcpy(name, ((struct x_part_hdr *)hdr)->part_name,
159 LPAR_NAME_LEN);
160 EBCASC(name, LPAR_NAME_LEN);
161 name[LPAR_NAME_LEN] = 0;
162 strstrip(name);
163}
164
165struct cpu_info {
166 __u16 cpu_addr;
167 char reserved1[2];
168 __u8 ctidx;
169 __u8 cflag;
170 __u16 weight;
171 __u64 acc_time;
172 __u64 lp_time;
173} __attribute__ ((packed));
174
175struct x_cpu_info {
176 __u16 cpu_addr;
177 char reserved1[2];
178 __u8 ctidx;
179 __u8 cflag;
180 __u16 weight;
181 __u64 acc_time;
182 __u64 lp_time;
183 __u16 min_weight;
184 __u16 cur_weight;
185 __u16 max_weight;
186 char reseved2[2];
187 __u64 online_time;
188 __u64 wait_time;
189 __u32 pma_weight;
190 __u32 polar_weight;
191 char reserved3[40];
192} __attribute__ ((packed));
193
194/* CPU info block */
195
196static inline int cpu_info__size(enum diag204_format type)
197{
198 if (type == INFO_SIMPLE)
199 return sizeof(struct cpu_info);
200 else /* INFO_EXT */
201 return sizeof(struct x_cpu_info);
202}
203
204static inline __u8 cpu_info__ctidx(enum diag204_format type, void *hdr)
205{
206 if (type == INFO_SIMPLE)
207 return ((struct cpu_info *)hdr)->ctidx;
208 else /* INFO_EXT */
209 return ((struct x_cpu_info *)hdr)->ctidx;
210}
211
212static inline __u16 cpu_info__cpu_addr(enum diag204_format type, void *hdr)
213{
214 if (type == INFO_SIMPLE)
215 return ((struct cpu_info *)hdr)->cpu_addr;
216 else /* INFO_EXT */
217 return ((struct x_cpu_info *)hdr)->cpu_addr;
218}
219
220static inline __u64 cpu_info__acc_time(enum diag204_format type, void *hdr)
221{
222 if (type == INFO_SIMPLE)
223 return ((struct cpu_info *)hdr)->acc_time;
224 else /* INFO_EXT */
225 return ((struct x_cpu_info *)hdr)->acc_time;
226}
227
228static inline __u64 cpu_info__lp_time(enum diag204_format type, void *hdr)
229{
230 if (type == INFO_SIMPLE)
231 return ((struct cpu_info *)hdr)->lp_time;
232 else /* INFO_EXT */
233 return ((struct x_cpu_info *)hdr)->lp_time;
234}
235
236static inline __u64 cpu_info__online_time(enum diag204_format type, void *hdr)
237{
238 if (type == INFO_SIMPLE)
239 return 0; /* online_time not available in simple info */
240 else /* INFO_EXT */
241 return ((struct x_cpu_info *)hdr)->online_time;
242}
243
244/* Physical header */
245
246struct phys_hdr {
247 char reserved1[1];
248 __u8 cpus;
249 char reserved2[6];
250 char mgm_name[8];
251} __attribute__ ((packed));
252
253struct x_phys_hdr {
254 char reserved1[1];
255 __u8 cpus;
256 char reserved2[6];
257 char mgm_name[8];
258 char reserved3[80];
259} __attribute__ ((packed));
260
261static inline int phys_hdr__size(enum diag204_format type)
262{
263 if (type == INFO_SIMPLE)
264 return sizeof(struct phys_hdr);
265 else /* INFO_EXT */
266 return sizeof(struct x_phys_hdr);
267}
268
269static inline __u8 phys_hdr__cpus(enum diag204_format type, void *hdr)
270{
271 if (type == INFO_SIMPLE)
272 return ((struct phys_hdr *)hdr)->cpus;
273 else /* INFO_EXT */
274 return ((struct x_phys_hdr *)hdr)->cpus;
275}
276
277/* Physical CPU info block */
278
279struct phys_cpu {
280 __u16 cpu_addr;
281 char reserved1[2];
282 __u8 ctidx;
283 char reserved2[3];
284 __u64 mgm_time;
285 char reserved3[8];
286} __attribute__ ((packed));
287
288struct x_phys_cpu {
289 __u16 cpu_addr;
290 char reserved1[2];
291 __u8 ctidx;
292 char reserved2[3];
293 __u64 mgm_time;
294 char reserved3[80];
295} __attribute__ ((packed));
296
297static inline int phys_cpu__size(enum diag204_format type)
298{
299 if (type == INFO_SIMPLE)
300 return sizeof(struct phys_cpu);
301 else /* INFO_EXT */
302 return sizeof(struct x_phys_cpu);
303}
304
305static inline __u16 phys_cpu__cpu_addr(enum diag204_format type, void *hdr)
306{
307 if (type == INFO_SIMPLE)
308 return ((struct phys_cpu *)hdr)->cpu_addr;
309 else /* INFO_EXT */
310 return ((struct x_phys_cpu *)hdr)->cpu_addr;
311}
312
313static inline __u64 phys_cpu__mgm_time(enum diag204_format type, void *hdr)
314{
315 if (type == INFO_SIMPLE)
316 return ((struct phys_cpu *)hdr)->mgm_time;
317 else /* INFO_EXT */
318 return ((struct x_phys_cpu *)hdr)->mgm_time;
319}
320
321static inline __u64 phys_cpu__ctidx(enum diag204_format type, void *hdr)
322{
323 if (type == INFO_SIMPLE)
324 return ((struct phys_cpu *)hdr)->ctidx;
325 else /* INFO_EXT */
326 return ((struct x_phys_cpu *)hdr)->ctidx;
327}
328
329/* Diagnose 204 functions */
330
331static int diag204(unsigned long subcode, unsigned long size, void *addr)
332{
333 register unsigned long _subcode asm("0") = subcode;
334 register unsigned long _size asm("1") = size;
335
336 asm volatile (" diag %2,%0,0x204\n"
337 "0: \n" ".section __ex_table,\"a\"\n"
338#ifndef __s390x__
339 " .align 4\n"
340 " .long 0b,0b\n"
341#else
342 " .align 8\n"
343 " .quad 0b,0b\n"
344#endif
345 ".previous":"+d" (_subcode), "+d"(_size)
346 :"d"(addr)
347 :"memory");
348 if (_subcode)
349 return -1;
350 else
351 return _size;
352}
353
354/*
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
358 * up to 93 pages!
359 */
360
361static void diag204_free_buffer(void)
362{
363 if (!diag204_buf)
364 return;
365 if (diag204_buf_vmalloc) {
366 vfree(diag204_buf_vmalloc);
367 diag204_buf_vmalloc = NULL;
368 } else {
369 free_pages((unsigned long) diag204_buf, 0);
370 }
371 diag204_buf_pages = 0;
372 diag204_buf = NULL;
373}
374
375static void *diag204_alloc_vbuf(int pages)
376{
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;
384 return diag204_buf;
385}
386
387static void *diag204_alloc_rbuf(void)
388{
389 diag204_buf = (void*)__get_free_pages(GFP_KERNEL,0);
390 if (diag204_buf)
391 return ERR_PTR(-ENOMEM);
392 diag204_buf_pages = 1;
393 return diag204_buf;
394}
395
396static void *diag204_get_buffer(enum diag204_format fmt, int *pages)
397{
398 if (diag204_buf) {
399 *pages = diag204_buf_pages;
400 return diag204_buf;
401 }
402 if (fmt == INFO_SIMPLE) {
403 *pages = 1;
404 return diag204_alloc_rbuf();
405 } else {/* INFO_EXT */
406 *pages = diag204(SUBC_RSI | INFO_EXT, 0, 0);
407 if (*pages <= 0)
408 return ERR_PTR(-ENOSYS);
409 else
410 return diag204_alloc_vbuf(*pages);
411 }
412}
413
414/*
415 * diag204_probe() has to find out, which type of diagnose 204 implementation
416 * we have on our machine. Currently there are three possible scanarios:
417 * - subcode 4 + simple data format (only one page)
418 * - subcode 4-6 + extended data format
419 * - subcode 4-7 + extended data format
420 *
421 * Subcode 5 is used to retrieve the size of the data, provided by subcodes
422 * 6 and 7. Subcode 7 basically has the same function as subcode 6. In addition
423 * to subcode 6 it provides also information about secondary cpus.
424 * In order to get as much information as possible, we first try
425 * subcode 7, then 6 and if both fail, we use subcode 4.
426 */
427
428static int diag204_probe(void)
429{
430 void *buf;
431 int pages, rc;
432
433 buf = diag204_get_buffer(INFO_EXT, &pages);
434 if (!IS_ERR(buf)) {
435 if (diag204(SUBC_STIB7 | INFO_EXT, pages, buf) >= 0) {
436 diag204_store_sc = SUBC_STIB7;
437 diag204_info_type = INFO_EXT;
438 goto out;
439 }
440 if (diag204(SUBC_STIB6 | INFO_EXT, pages, buf) >= 0) {
441 diag204_store_sc = SUBC_STIB7;
442 diag204_info_type = INFO_EXT;
443 goto out;
444 }
445 diag204_free_buffer();
446 }
447
448 /* subcodes 6 and 7 failed, now try subcode 4 */
449
450 buf = diag204_get_buffer(INFO_SIMPLE, &pages);
451 if (IS_ERR(buf)) {
452 rc = PTR_ERR(buf);
453 goto fail_alloc;
454 }
455 if (diag204(SUBC_STIB4 | INFO_SIMPLE, pages, buf) >= 0) {
456 diag204_store_sc = SUBC_STIB4;
457 diag204_info_type = INFO_SIMPLE;
458 goto out;
459 } else {
460 rc = -ENOSYS;
461 goto fail_store;
462 }
463out:
464 rc = 0;
465fail_store:
466 diag204_free_buffer();
467fail_alloc:
468 return rc;
469}
470
471static void *diag204_store(void)
472{
473 void *buf;
474 int pages;
475
476 buf = diag204_get_buffer(diag204_info_type, &pages);
477 if (IS_ERR(buf))
478 goto out;
479 if (diag204(diag204_store_sc | diag204_info_type, pages, buf) < 0)
480 return ERR_PTR(-ENOSYS);
481out:
482 return buf;
483}
484
485/* Diagnose 224 functions */
486
487static void diag224(void *ptr)
488{
489 asm volatile(" diag %0,%1,0x224\n"
490 : :"d" (0), "d"(ptr) : "memory");
491}
492
493static int diag224_get_name_table(void)
494{
495 /* memory must be below 2GB */
496 diag224_cpu_names = kmalloc(PAGE_SIZE, GFP_KERNEL | GFP_DMA);
497 if (!diag224_cpu_names)
498 return -ENOMEM;
499 diag224(diag224_cpu_names);
500 EBCASC(diag224_cpu_names + 16, (*diag224_cpu_names + 1) * 16);
501 return 0;
502}
503
504static void diag224_delete_name_table(void)
505{
506 kfree(diag224_cpu_names);
507}
508
509static int diag224_idx2name(int index, char *name)
510{
511 memcpy(name, diag224_cpu_names + ((index + 1) * CPU_NAME_LEN),
512 CPU_NAME_LEN);
513 name[CPU_NAME_LEN] = 0;
514 strstrip(name);
515 return 0;
516}
517
518__init int hypfs_diag_init(void)
519{
520 int rc;
521
522 if (diag204_probe()) {
523 printk(KERN_ERR "hypfs: diag 204 not working.");
524 return -ENODATA;
525 }
526 rc = diag224_get_name_table();
527 if (rc) {
528 diag224_delete_name_table();
529 printk(KERN_ERR "hypfs: could not get name table.\n");
530 }
531 return rc;
532}
533
534__exit void hypfs_diag_exit(void)
535{
536 diag224_delete_name_table();
537 diag204_free_buffer();
538}
539
540/*
541 * Functions to create the directory structure
542 * *******************************************
543 */
544
545static int hypfs_create_cpu_files(struct super_block *sb,
546 struct dentry *cpus_dir, void *cpu_info)
547{
548 struct dentry *cpu_dir;
549 char buffer[TMP_SIZE];
550 void *rc;
551
552 snprintf(buffer, TMP_SIZE, "%d", cpu_info__cpu_addr(diag204_info_type,
553 cpu_info));
554 cpu_dir = hypfs_mkdir(sb, cpus_dir, buffer);
555 rc = hypfs_create_u64(sb, cpu_dir, "mgmtime",
556 cpu_info__acc_time(diag204_info_type, cpu_info) -
557 cpu_info__lp_time(diag204_info_type, cpu_info));
558 if (IS_ERR(rc))
559 return PTR_ERR(rc);
560 rc = hypfs_create_u64(sb, cpu_dir, "cputime",
561 cpu_info__lp_time(diag204_info_type, cpu_info));
562 if (IS_ERR(rc))
563 return PTR_ERR(rc);
564 if (diag204_info_type == INFO_EXT) {
565 rc = hypfs_create_u64(sb, cpu_dir, "onlinetime",
566 cpu_info__online_time(diag204_info_type,
567 cpu_info));
568 if (IS_ERR(rc))
569 return PTR_ERR(rc);
570 }
571 diag224_idx2name(cpu_info__ctidx(diag204_info_type, cpu_info), buffer);
572 rc = hypfs_create_str(sb, cpu_dir, "type", buffer);
573 if (IS_ERR(rc))
574 return PTR_ERR(rc);
575 return 0;
576}
577
578static void *hypfs_create_lpar_files(struct super_block *sb,
579 struct dentry *systems_dir, void *part_hdr)
580{
581 struct dentry *cpus_dir;
582 struct dentry *lpar_dir;
583 char lpar_name[LPAR_NAME_LEN + 1];
584 void *cpu_info;
585 int i;
586
587 part_hdr__part_name(diag204_info_type, part_hdr, lpar_name);
588 lpar_name[LPAR_NAME_LEN] = 0;
589 lpar_dir = hypfs_mkdir(sb, systems_dir, lpar_name);
590 if (IS_ERR(lpar_dir))
591 return lpar_dir;
592 cpus_dir = hypfs_mkdir(sb, lpar_dir, "cpus");
593 if (IS_ERR(cpus_dir))
594 return cpus_dir;
595 cpu_info = part_hdr + part_hdr__size(diag204_info_type);
596 for (i = 0; i < part_hdr__rcpus(diag204_info_type, part_hdr); i++) {
597 int rc;
598 rc = hypfs_create_cpu_files(sb, cpus_dir, cpu_info);
599 if (rc)
600 return ERR_PTR(rc);
601 cpu_info += cpu_info__size(diag204_info_type);
602 }
603 return cpu_info;
604}
605
606static int hypfs_create_phys_cpu_files(struct super_block *sb,
607 struct dentry *cpus_dir, void *cpu_info)
608{
609 struct dentry *cpu_dir;
610 char buffer[TMP_SIZE];
611 void *rc;
612
613 snprintf(buffer, TMP_SIZE, "%i", phys_cpu__cpu_addr(diag204_info_type,
614 cpu_info));
615 cpu_dir = hypfs_mkdir(sb, cpus_dir, buffer);
616 if (IS_ERR(cpu_dir))
617 return PTR_ERR(cpu_dir);
618 rc = hypfs_create_u64(sb, cpu_dir, "mgmtime",
619 phys_cpu__mgm_time(diag204_info_type, cpu_info));
620 if (IS_ERR(rc))
621 return PTR_ERR(rc);
622 diag224_idx2name(phys_cpu__ctidx(diag204_info_type, cpu_info), buffer);
623 rc = hypfs_create_str(sb, cpu_dir, "type", buffer);
624 if (IS_ERR(rc))
625 return PTR_ERR(rc);
626 return 0;
627}
628
629static void *hypfs_create_phys_files(struct super_block *sb,
630 struct dentry *parent_dir, void *phys_hdr)
631{
632 int i;
633 void *cpu_info;
634 struct dentry *cpus_dir;
635
636 cpus_dir = hypfs_mkdir(sb, parent_dir, "cpus");
637 if (IS_ERR(cpus_dir))
638 return cpus_dir;
639 cpu_info = phys_hdr + phys_hdr__size(diag204_info_type);
640 for (i = 0; i < phys_hdr__cpus(diag204_info_type, phys_hdr); i++) {
641 int rc;
642 rc = hypfs_create_phys_cpu_files(sb, cpus_dir, cpu_info);
643 if (rc)
644 return ERR_PTR(rc);
645 cpu_info += phys_cpu__size(diag204_info_type);
646 }
647 return cpu_info;
648}
649
650int hypfs_diag_create_files(struct super_block *sb, struct dentry *root)
651{
652 struct dentry *systems_dir, *hyp_dir;
653 void *time_hdr, *part_hdr;
654 int i, rc;
655 void *buffer, *ptr;
656
657 buffer = diag204_store();
658 if (IS_ERR(buffer))
659 return PTR_ERR(buffer);
660
661 systems_dir = hypfs_mkdir(sb, root, "systems");
662 if (IS_ERR(systems_dir)) {
663 rc = PTR_ERR(systems_dir);
664 goto err_out;
665 }
666 time_hdr = (struct x_info_blk_hdr *)buffer;
667 part_hdr = time_hdr + info_blk_hdr__size(diag204_info_type);
668 for (i = 0; i < info_blk_hdr__npar(diag204_info_type, time_hdr); i++) {
669 part_hdr = hypfs_create_lpar_files(sb, systems_dir, part_hdr);
670 if (IS_ERR(part_hdr)) {
671 rc = PTR_ERR(part_hdr);
672 goto err_out;
673 }
674 }
675 if (info_blk_hdr__flags(diag204_info_type, time_hdr) & LPAR_PHYS_FLG) {
676 ptr = hypfs_create_phys_files(sb, root, part_hdr);
677 if (IS_ERR(ptr)) {
678 rc = PTR_ERR(ptr);
679 goto err_out;
680 }
681 }
682 hyp_dir = hypfs_mkdir(sb, root, "hyp");
683 if (IS_ERR(hyp_dir)) {
684 rc = PTR_ERR(hyp_dir);
685 goto err_out;
686 }
687 ptr = hypfs_create_str(sb, hyp_dir, "type", "LPAR Hypervisor");
688 if (IS_ERR(ptr)) {
689 rc = PTR_ERR(ptr);
690 goto err_out;
691 }
692 rc = 0;
693
694err_out:
695 return rc;
696}
diff --git a/arch/s390/hypfs/hypfs_diag.h b/arch/s390/hypfs/hypfs_diag.h
new file mode 100644
index 000000000000..793dea6b9bb6
--- /dev/null
+++ b/arch/s390/hypfs/hypfs_diag.h
@@ -0,0 +1,16 @@
1/*
2 * fs/hypfs/hypfs_diag.h
3 * Hypervisor filesystem for Linux on s390.
4 *
5 * Copyright (C) IBM Corp. 2006
6 * Author(s): Michael Holzheu <holzheu@de.ibm.com>
7 */
8
9#ifndef _HYPFS_DIAG_H_
10#define _HYPFS_DIAG_H_
11
12extern int hypfs_diag_init(void);
13extern void hypfs_diag_exit(void);
14extern int hypfs_diag_create_files(struct super_block *sb, struct dentry *root);
15
16#endif /* _HYPFS_DIAG_H_ */
diff --git a/arch/s390/hypfs/inode.c b/arch/s390/hypfs/inode.c
new file mode 100644
index 000000000000..bab560a1357a
--- /dev/null
+++ b/arch/s390/hypfs/inode.c
@@ -0,0 +1,492 @@
1/*
2 * fs/hypfs/inode.c
3 * Hypervisor filesystem for Linux on s390.
4 *
5 * Copyright (C) IBM Corp. 2006
6 * Author(s): Michael Holzheu <holzheu@de.ibm.com>
7 */
8
9#include <linux/types.h>
10#include <linux/errno.h>
11#include <linux/fs.h>
12#include <linux/namei.h>
13#include <linux/vfs.h>
14#include <linux/pagemap.h>
15#include <linux/gfp.h>
16#include <linux/time.h>
17#include <linux/parser.h>
18#include <linux/sysfs.h>
19#include <linux/module.h>
20#include <asm/ebcdic.h>
21#include "hypfs.h"
22#include "hypfs_diag.h"
23
24#define HYPFS_MAGIC 0x687970 /* ASCII 'hyp' */
25#define TMP_SIZE 64 /* size of temporary buffers */
26
27static struct dentry *hypfs_create_update_file(struct super_block *sb,
28 struct dentry *dir);
29
30struct hypfs_sb_info {
31 uid_t uid; /* uid used for files and dirs */
32 gid_t gid; /* gid used for files and dirs */
33 struct dentry *update_file; /* file to trigger update */
34 time_t last_update; /* last update time in secs since 1970 */
35 struct mutex lock; /* lock to protect update process */
36};
37
38static struct file_operations hypfs_file_ops;
39static struct file_system_type hypfs_type;
40static struct super_operations hypfs_s_ops;
41
42/* start of list of all dentries, which have to be deleted on update */
43static struct dentry *hypfs_last_dentry;
44
45static void hypfs_update_update(struct super_block *sb)
46{
47 struct hypfs_sb_info *sb_info = sb->s_fs_info;
48 struct inode *inode = sb_info->update_file->d_inode;
49
50 sb_info->last_update = get_seconds();
51 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
52}
53
54/* directory tree removal functions */
55
56static void hypfs_add_dentry(struct dentry *dentry)
57{
58 dentry->d_fsdata = hypfs_last_dentry;
59 hypfs_last_dentry = dentry;
60}
61
62static void hypfs_remove(struct dentry *dentry)
63{
64 struct dentry *parent;
65
66 parent = dentry->d_parent;
67 if (S_ISDIR(dentry->d_inode->i_mode))
68 simple_rmdir(parent->d_inode, dentry);
69 else
70 simple_unlink(parent->d_inode, dentry);
71 d_delete(dentry);
72 dput(dentry);
73}
74
75static void hypfs_delete_tree(struct dentry *root)
76{
77 while (hypfs_last_dentry) {
78 struct dentry *next_dentry;
79 next_dentry = hypfs_last_dentry->d_fsdata;
80 hypfs_remove(hypfs_last_dentry);
81 hypfs_last_dentry = next_dentry;
82 }
83}
84
85static struct inode *hypfs_make_inode(struct super_block *sb, int mode)
86{
87 struct inode *ret = new_inode(sb);
88
89 if (ret) {
90 struct hypfs_sb_info *hypfs_info = sb->s_fs_info;
91 ret->i_mode = mode;
92 ret->i_uid = hypfs_info->uid;
93 ret->i_gid = hypfs_info->gid;
94 ret->i_blksize = PAGE_CACHE_SIZE;
95 ret->i_blocks = 0;
96 ret->i_atime = ret->i_mtime = ret->i_ctime = CURRENT_TIME;
97 if (mode & S_IFDIR)
98 ret->i_nlink = 2;
99 else
100 ret->i_nlink = 1;
101 }
102 return ret;
103}
104
105static void hypfs_drop_inode(struct inode *inode)
106{
107 kfree(inode->u.generic_ip);
108 generic_delete_inode(inode);
109}
110
111static int hypfs_open(struct inode *inode, struct file *filp)
112{
113 char *data = filp->f_dentry->d_inode->u.generic_ip;
114 struct hypfs_sb_info *fs_info;
115
116 if (filp->f_mode & FMODE_WRITE) {
117 if (!(inode->i_mode & S_IWUGO))
118 return -EACCES;
119 }
120 if (filp->f_mode & FMODE_READ) {
121 if (!(inode->i_mode & S_IRUGO))
122 return -EACCES;
123 }
124
125 fs_info = inode->i_sb->s_fs_info;
126 if(data) {
127 mutex_lock(&fs_info->lock);
128 filp->private_data = kstrdup(data, GFP_KERNEL);
129 if (!filp->private_data) {
130 mutex_unlock(&fs_info->lock);
131 return -ENOMEM;
132 }
133 mutex_unlock(&fs_info->lock);
134 }
135 return 0;
136}
137
138static ssize_t hypfs_aio_read(struct kiocb *iocb, __user char *buf,
139 size_t count, loff_t offset)
140{
141 char *data;
142 size_t len;
143 struct file *filp = iocb->ki_filp;
144
145 data = filp->private_data;
146 len = strlen(data);
147 if (offset > len) {
148 count = 0;
149 goto out;
150 }
151 if (count > len - offset)
152 count = len - offset;
153 if (copy_to_user(buf, data + offset, count)) {
154 count = -EFAULT;
155 goto out;
156 }
157 iocb->ki_pos += count;
158 file_accessed(filp);
159out:
160 return count;
161}
162static ssize_t hypfs_aio_write(struct kiocb *iocb, const char __user *buf,
163 size_t count, loff_t pos)
164{
165 int rc;
166 struct super_block *sb;
167 struct hypfs_sb_info *fs_info;
168
169 sb = iocb->ki_filp->f_dentry->d_inode->i_sb;
170 fs_info = sb->s_fs_info;
171 /*
172 * Currently we only allow one update per second for two reasons:
173 * 1. diag 204 is VERY expensive
174 * 2. If several processes do updates in parallel and then read the
175 * hypfs data, the likelihood of collisions is reduced, if we restrict
176 * the minimum update interval. A collision occurs, if during the
177 * data gathering of one process another process triggers an update
178 * If the first process wants to ensure consistent data, it has
179 * to restart data collection in this case.
180 */
181 mutex_lock(&fs_info->lock);
182 if (fs_info->last_update == get_seconds()) {
183 rc = -EBUSY;
184 goto out;
185 }
186 hypfs_delete_tree(sb->s_root);
187 rc = hypfs_diag_create_files(sb, sb->s_root);
188 if (rc) {
189 printk(KERN_ERR "hypfs: Update failed\n");
190 hypfs_delete_tree(sb->s_root);
191 goto out;
192 }
193 hypfs_update_update(sb);
194 rc = count;
195out:
196 mutex_unlock(&fs_info->lock);
197 return rc;
198}
199
200static int hypfs_release(struct inode *inode, struct file *filp)
201{
202 kfree(filp->private_data);
203 return 0;
204}
205
206enum { opt_uid, opt_gid, opt_err };
207
208static match_table_t hypfs_tokens = {
209 {opt_uid, "uid=%u"},
210 {opt_gid, "gid=%u"},
211 {opt_err, NULL}
212};
213
214static int hypfs_parse_options(char *options, struct super_block *sb)
215{
216 char *str;
217 substring_t args[MAX_OPT_ARGS];
218
219 if (!options)
220 return 0;
221 while ((str = strsep(&options, ",")) != NULL) {
222 int token, option;
223 struct hypfs_sb_info *hypfs_info = sb->s_fs_info;
224
225 if (!*str)
226 continue;
227 token = match_token(str, hypfs_tokens, args);
228 switch (token) {
229 case opt_uid:
230 if (match_int(&args[0], &option))
231 return -EINVAL;
232 hypfs_info->uid = option;
233 break;
234 case opt_gid:
235 if (match_int(&args[0], &option))
236 return -EINVAL;
237 hypfs_info->gid = option;
238 break;
239 case opt_err:
240 default:
241 printk(KERN_ERR "hypfs: Unrecognized mount option "
242 "\"%s\" or missing value\n", str);
243 return -EINVAL;
244 }
245 }
246 return 0;
247}
248
249static int hypfs_fill_super(struct super_block *sb, void *data, int silent)
250{
251 struct inode *root_inode;
252 struct dentry *root_dentry;
253 int rc = 0;
254 struct hypfs_sb_info *sbi;
255
256 sbi = kzalloc(sizeof(struct hypfs_sb_info), GFP_KERNEL);
257 if (!sbi)
258 return -ENOMEM;
259 mutex_init(&sbi->lock);
260 sbi->uid = current->uid;
261 sbi->gid = current->gid;
262 sb->s_fs_info = sbi;
263 sb->s_blocksize = PAGE_CACHE_SIZE;
264 sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
265 sb->s_magic = HYPFS_MAGIC;
266 sb->s_op = &hypfs_s_ops;
267 if (hypfs_parse_options(data, sb)) {
268 rc = -EINVAL;
269 goto err_alloc;
270 }
271 root_inode = hypfs_make_inode(sb, S_IFDIR | 0755);
272 if (!root_inode) {
273 rc = -ENOMEM;
274 goto err_alloc;
275 }
276 root_inode->i_op = &simple_dir_inode_operations;
277 root_inode->i_fop = &simple_dir_operations;
278 root_dentry = d_alloc_root(root_inode);
279 if (!root_dentry) {
280 iput(root_inode);
281 rc = -ENOMEM;
282 goto err_alloc;
283 }
284 rc = hypfs_diag_create_files(sb, root_dentry);
285 if (rc)
286 goto err_tree;
287 sbi->update_file = hypfs_create_update_file(sb, root_dentry);
288 if (IS_ERR(sbi->update_file)) {
289 rc = PTR_ERR(sbi->update_file);
290 goto err_tree;
291 }
292 hypfs_update_update(sb);
293 sb->s_root = root_dentry;
294 return 0;
295
296err_tree:
297 hypfs_delete_tree(root_dentry);
298 d_genocide(root_dentry);
299 dput(root_dentry);
300err_alloc:
301 kfree(sbi);
302 return rc;
303}
304
305static struct super_block *hypfs_get_super(struct file_system_type *fst,
306 int flags, const char *devname,
307 void *data)
308{
309 return get_sb_single(fst, flags, data, hypfs_fill_super);
310}
311
312static void hypfs_kill_super(struct super_block *sb)
313{
314 struct hypfs_sb_info *sb_info = sb->s_fs_info;
315
316 hypfs_delete_tree(sb->s_root);
317 hypfs_remove(sb_info->update_file);
318 kfree(sb->s_fs_info);
319 sb->s_fs_info = NULL;
320 kill_litter_super(sb);
321}
322
323static struct dentry *hypfs_create_file(struct super_block *sb,
324 struct dentry *parent, const char *name,
325 char *data, mode_t mode)
326{
327 struct dentry *dentry;
328 struct inode *inode;
329 struct qstr qname;
330
331 qname.name = name;
332 qname.len = strlen(name);
333 qname.hash = full_name_hash(name, qname.len);
334 dentry = lookup_one_len(name, parent, strlen(name));
335 if (IS_ERR(dentry))
336 return ERR_PTR(-ENOMEM);
337 inode = hypfs_make_inode(sb, mode);
338 if (!inode) {
339 dput(dentry);
340 return ERR_PTR(-ENOMEM);
341 }
342 if (mode & S_IFREG) {
343 inode->i_fop = &hypfs_file_ops;
344 if (data)
345 inode->i_size = strlen(data);
346 else
347 inode->i_size = 0;
348 } else if (mode & S_IFDIR) {
349 inode->i_op = &simple_dir_inode_operations;
350 inode->i_fop = &simple_dir_operations;
351 parent->d_inode->i_nlink++;
352 } else
353 BUG();
354 inode->u.generic_ip = data;
355 d_instantiate(dentry, inode);
356 dget(dentry);
357 return dentry;
358}
359
360struct dentry *hypfs_mkdir(struct super_block *sb, struct dentry *parent,
361 const char *name)
362{
363 struct dentry *dentry;
364
365 dentry = hypfs_create_file(sb, parent, name, NULL, S_IFDIR | DIR_MODE);
366 if (IS_ERR(dentry))
367 return dentry;
368 hypfs_add_dentry(dentry);
369 parent->d_inode->i_nlink++;
370 return dentry;
371}
372
373static struct dentry *hypfs_create_update_file(struct super_block *sb,
374 struct dentry *dir)
375{
376 struct dentry *dentry;
377
378 dentry = hypfs_create_file(sb, dir, "update", NULL,
379 S_IFREG | UPDATE_FILE_MODE);
380 /*
381 * We do not put the update file on the 'delete' list with
382 * hypfs_add_dentry(), since it should not be removed when the tree
383 * is updated.
384 */
385 return dentry;
386}
387
388struct dentry *hypfs_create_u64(struct super_block *sb, struct dentry *dir,
389 const char *name, __u64 value)
390{
391 char *buffer;
392 char tmp[TMP_SIZE];
393 struct dentry *dentry;
394
395 snprintf(tmp, TMP_SIZE, "%lld\n", (unsigned long long int)value);
396 buffer = kstrdup(tmp, GFP_KERNEL);
397 if (!buffer)
398 return ERR_PTR(-ENOMEM);
399 dentry =
400 hypfs_create_file(sb, dir, name, buffer, S_IFREG | REG_FILE_MODE);
401 if (IS_ERR(dentry)) {
402 kfree(buffer);
403 return ERR_PTR(-ENOMEM);
404 }
405 hypfs_add_dentry(dentry);
406 return dentry;
407}
408
409struct dentry *hypfs_create_str(struct super_block *sb, struct dentry *dir,
410 const char *name, char *string)
411{
412 char *buffer;
413 struct dentry *dentry;
414
415 buffer = kmalloc(strlen(string) + 2, GFP_KERNEL);
416 if (!buffer)
417 return ERR_PTR(-ENOMEM);
418 sprintf(buffer, "%s\n", string);
419 dentry =
420 hypfs_create_file(sb, dir, name, buffer, S_IFREG | REG_FILE_MODE);
421 if (IS_ERR(dentry)) {
422 kfree(buffer);
423 return ERR_PTR(-ENOMEM);
424 }
425 hypfs_add_dentry(dentry);
426 return dentry;
427}
428
429static struct file_operations hypfs_file_ops = {
430 .open = hypfs_open,
431 .release = hypfs_release,
432 .read = do_sync_read,
433 .write = do_sync_write,
434 .aio_read = hypfs_aio_read,
435 .aio_write = hypfs_aio_write,
436};
437
438static struct file_system_type hypfs_type = {
439 .owner = THIS_MODULE,
440 .name = "s390_hypfs",
441 .get_sb = hypfs_get_super,
442 .kill_sb = hypfs_kill_super
443};
444
445static struct super_operations hypfs_s_ops = {
446 .statfs = simple_statfs,
447 .drop_inode = hypfs_drop_inode,
448};
449
450static decl_subsys(s390, NULL, NULL);
451
452static int __init hypfs_init(void)
453{
454 int rc;
455
456 if (MACHINE_IS_VM)
457 return -ENODATA;
458 if (hypfs_diag_init()) {
459 rc = -ENODATA;
460 goto fail_diag;
461 }
462 kset_set_kset_s(&s390_subsys, hypervisor_subsys);
463 rc = subsystem_register(&s390_subsys);
464 if (rc)
465 goto fail_sysfs;
466 rc = register_filesystem(&hypfs_type);
467 if (rc)
468 goto fail_filesystem;
469 return 0;
470
471fail_filesystem:
472 subsystem_unregister(&s390_subsys);
473fail_sysfs:
474 hypfs_diag_exit();
475fail_diag:
476 printk(KERN_ERR "hypfs: Initialization failed with rc = %i.\n", rc);
477 return rc;
478}
479
480static void __exit hypfs_exit(void)
481{
482 hypfs_diag_exit();
483 unregister_filesystem(&hypfs_type);
484 subsystem_unregister(&s390_subsys);
485}
486
487module_init(hypfs_init)
488module_exit(hypfs_exit)
489
490MODULE_LICENSE("GPL");
491MODULE_AUTHOR("Michael Holzheu <holzheu@de.ibm.com>");
492MODULE_DESCRIPTION("s390 Hypervisor Filesystem");
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-22 17:37:43 -0500