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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Hypervisor filesystem for Linux on s390. Diag 204 and 224
4 * implementation.
5 *
6 * Copyright IBM Corp. 2006, 2008
7 * Author(s): Michael Holzheu <holzheu@de.ibm.com>
8 */
9
10#define KMSG_COMPONENT "hypfs"
11#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
12
13#include <linux/types.h>
14#include <linux/errno.h>
15#include <linux/slab.h>
16#include <linux/string.h>
17#include <linux/vmalloc.h>
18#include <linux/mm.h>
19#include <asm/diag.h>
20#include <asm/ebcdic.h>
21#include "hypfs_diag.h"
22#include "hypfs.h"
23
24#define DBFS_D204_HDR_VERSION 0
25
26static enum diag204_sc diag204_store_sc; /* used subcode for store */
27static enum diag204_format diag204_info_type; /* used diag 204 data format */
28
29static void *diag204_buf; /* 4K aligned buffer for diag204 data */
30static int diag204_buf_pages; /* number of pages for diag204 data */
31
32static struct dentry *dbfs_d204_file;
33
34enum diag204_format diag204_get_info_type(void)
35{
36 return diag204_info_type;
37}
38
39static void diag204_set_info_type(enum diag204_format type)
40{
41 diag204_info_type = type;
42}
43
44/* Diagnose 204 functions */
45/*
46 * For the old diag subcode 4 with simple data format we have to use real
47 * memory. If we use subcode 6 or 7 with extended data format, we can (and
48 * should) use vmalloc, since we need a lot of memory in that case. Currently
49 * up to 93 pages!
50 */
51
52static void diag204_free_buffer(void)
53{
54 vfree(diag204_buf);
55 diag204_buf = NULL;
56}
57
58void *diag204_get_buffer(enum diag204_format fmt, int *pages)
59{
60 if (diag204_buf) {
61 *pages = diag204_buf_pages;
62 return diag204_buf;
63 }
64 if (fmt == DIAG204_INFO_SIMPLE) {
65 *pages = 1;
66 } else {/* DIAG204_INFO_EXT */
67 *pages = diag204((unsigned long)DIAG204_SUBC_RSI |
68 (unsigned long)DIAG204_INFO_EXT, 0, NULL);
69 if (*pages <= 0)
70 return ERR_PTR(-EOPNOTSUPP);
71 }
72 diag204_buf = __vmalloc_node(array_size(*pages, PAGE_SIZE),
73 PAGE_SIZE, GFP_KERNEL, NUMA_NO_NODE,
74 __builtin_return_address(0));
75 if (!diag204_buf)
76 return ERR_PTR(-ENOMEM);
77 diag204_buf_pages = *pages;
78 return diag204_buf;
79}
80
81/*
82 * diag204_probe() has to find out, which type of diagnose 204 implementation
83 * we have on our machine. Currently there are three possible scanarios:
84 * - subcode 4 + simple data format (only one page)
85 * - subcode 4-6 + extended data format
86 * - subcode 4-7 + extended data format
87 *
88 * Subcode 5 is used to retrieve the size of the data, provided by subcodes
89 * 6 and 7. Subcode 7 basically has the same function as subcode 6. In addition
90 * to subcode 6 it provides also information about secondary cpus.
91 * In order to get as much information as possible, we first try
92 * subcode 7, then 6 and if both fail, we use subcode 4.
93 */
94
95static int diag204_probe(void)
96{
97 void *buf;
98 int pages, rc;
99
100 buf = diag204_get_buffer(DIAG204_INFO_EXT, &pages);
101 if (!IS_ERR(buf)) {
102 if (diag204((unsigned long)DIAG204_SUBC_STIB7 |
103 (unsigned long)DIAG204_INFO_EXT, pages, buf) >= 0) {
104 diag204_store_sc = DIAG204_SUBC_STIB7;
105 diag204_set_info_type(DIAG204_INFO_EXT);
106 goto out;
107 }
108 if (diag204((unsigned long)DIAG204_SUBC_STIB6 |
109 (unsigned long)DIAG204_INFO_EXT, pages, buf) >= 0) {
110 diag204_store_sc = DIAG204_SUBC_STIB6;
111 diag204_set_info_type(DIAG204_INFO_EXT);
112 goto out;
113 }
114 diag204_free_buffer();
115 }
116
117 /* subcodes 6 and 7 failed, now try subcode 4 */
118
119 buf = diag204_get_buffer(DIAG204_INFO_SIMPLE, &pages);
120 if (IS_ERR(buf)) {
121 rc = PTR_ERR(buf);
122 goto fail_alloc;
123 }
124 if (diag204((unsigned long)DIAG204_SUBC_STIB4 |
125 (unsigned long)DIAG204_INFO_SIMPLE, pages, buf) >= 0) {
126 diag204_store_sc = DIAG204_SUBC_STIB4;
127 diag204_set_info_type(DIAG204_INFO_SIMPLE);
128 goto out;
129 } else {
130 rc = -EOPNOTSUPP;
131 goto fail_store;
132 }
133out:
134 rc = 0;
135fail_store:
136 diag204_free_buffer();
137fail_alloc:
138 return rc;
139}
140
141int diag204_store(void *buf, int pages)
142{
143 int rc;
144
145 rc = diag204((unsigned long)diag204_store_sc |
146 (unsigned long)diag204_get_info_type(), pages, buf);
147 return rc < 0 ? -EOPNOTSUPP : 0;
148}
149
150struct dbfs_d204_hdr {
151 u64 len; /* Length of d204 buffer without header */
152 u16 version; /* Version of header */
153 u8 sc; /* Used subcode */
154 char reserved[53];
155} __attribute__ ((packed));
156
157struct dbfs_d204 {
158 struct dbfs_d204_hdr hdr; /* 64 byte header */
159 char buf[]; /* d204 buffer */
160} __attribute__ ((packed));
161
162static int dbfs_d204_create(void **data, void **data_free_ptr, size_t *size)
163{
164 struct dbfs_d204 *d204;
165 int rc, buf_size;
166 void *base;
167
168 buf_size = PAGE_SIZE * (diag204_buf_pages + 1) + sizeof(d204->hdr);
169 base = vzalloc(buf_size);
170 if (!base)
171 return -ENOMEM;
172 d204 = PTR_ALIGN(base + sizeof(d204->hdr), PAGE_SIZE) - sizeof(d204->hdr);
173 rc = diag204_store(d204->buf, diag204_buf_pages);
174 if (rc) {
175 vfree(base);
176 return rc;
177 }
178 d204->hdr.version = DBFS_D204_HDR_VERSION;
179 d204->hdr.len = PAGE_SIZE * diag204_buf_pages;
180 d204->hdr.sc = diag204_store_sc;
181 *data = d204;
182 *data_free_ptr = base;
183 *size = d204->hdr.len + sizeof(struct dbfs_d204_hdr);
184 return 0;
185}
186
187static struct hypfs_dbfs_file dbfs_file_d204 = {
188 .name = "diag_204",
189 .data_create = dbfs_d204_create,
190 .data_free = vfree,
191};
192
193__init int hypfs_diag_init(void)
194{
195 int rc;
196
197 if (diag204_probe()) {
198 pr_info("The hardware system does not support hypfs\n");
199 return -ENODATA;
200 }
201
202 if (diag204_get_info_type() == DIAG204_INFO_EXT)
203 hypfs_dbfs_create_file(&dbfs_file_d204);
204
205 rc = hypfs_diag_fs_init();
206 if (rc) {
207 pr_err("The hardware system does not provide all functions required by hypfs\n");
208 debugfs_remove(dbfs_d204_file);
209 }
210 return rc;
211}
212
213void hypfs_diag_exit(void)
214{
215 debugfs_remove(dbfs_d204_file);
216 hypfs_diag_fs_exit();
217 diag204_free_buffer();
218 hypfs_dbfs_remove_file(&dbfs_file_d204);
219}
1/*
2 * arch/s390/hypfs/hypfs_diag.c
3 * Hypervisor filesystem for Linux on s390. Diag 204 and 224
4 * implementation.
5 *
6 * Copyright IBM Corp. 2006, 2008
7 * Author(s): Michael Holzheu <holzheu@de.ibm.com>
8 */
9
10#define KMSG_COMPONENT "hypfs"
11#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
12
13#include <linux/types.h>
14#include <linux/errno.h>
15#include <linux/slab.h>
16#include <linux/string.h>
17#include <linux/vmalloc.h>
18#include <linux/mm.h>
19#include <asm/ebcdic.h>
20#include "hypfs.h"
21
22#define LPAR_NAME_LEN 8 /* lpar name len in diag 204 data */
23#define CPU_NAME_LEN 16 /* type name len of cpus in diag224 name table */
24#define TMP_SIZE 64 /* size of temporary buffers */
25
26#define DBFS_D204_HDR_VERSION 0
27
28/* diag 204 subcodes */
29enum diag204_sc {
30 SUBC_STIB4 = 4,
31 SUBC_RSI = 5,
32 SUBC_STIB6 = 6,
33 SUBC_STIB7 = 7
34};
35
36/* The two available diag 204 data formats */
37enum diag204_format {
38 INFO_SIMPLE = 0,
39 INFO_EXT = 0x00010000
40};
41
42/* bit is set in flags, when physical cpu info is included in diag 204 data */
43#define LPAR_PHYS_FLG 0x80
44
45static char *diag224_cpu_names; /* diag 224 name table */
46static enum diag204_sc diag204_store_sc; /* used subcode for store */
47static enum diag204_format diag204_info_type; /* used diag 204 data format */
48
49static void *diag204_buf; /* 4K aligned buffer for diag204 data */
50static void *diag204_buf_vmalloc; /* vmalloc pointer for diag204 data */
51static int diag204_buf_pages; /* number of pages for diag204 data */
52
53static struct dentry *dbfs_d204_file;
54
55/*
56 * DIAG 204 data structures and member access functions.
57 *
58 * Since we have two different diag 204 data formats for old and new s390
59 * machines, we do not access the structs directly, but use getter functions for
60 * each struct member instead. This should make the code more readable.
61 */
62
63/* Time information block */
64
65struct info_blk_hdr {
66 __u8 npar;
67 __u8 flags;
68 __u16 tslice;
69 __u16 phys_cpus;
70 __u16 this_part;
71 __u64 curtod;
72} __attribute__ ((packed));
73
74struct x_info_blk_hdr {
75 __u8 npar;
76 __u8 flags;
77 __u16 tslice;
78 __u16 phys_cpus;
79 __u16 this_part;
80 __u64 curtod1;
81 __u64 curtod2;
82 char reserved[40];
83} __attribute__ ((packed));
84
85static inline int info_blk_hdr__size(enum diag204_format type)
86{
87 if (type == INFO_SIMPLE)
88 return sizeof(struct info_blk_hdr);
89 else /* INFO_EXT */
90 return sizeof(struct x_info_blk_hdr);
91}
92
93static inline __u8 info_blk_hdr__npar(enum diag204_format type, void *hdr)
94{
95 if (type == INFO_SIMPLE)
96 return ((struct info_blk_hdr *)hdr)->npar;
97 else /* INFO_EXT */
98 return ((struct x_info_blk_hdr *)hdr)->npar;
99}
100
101static inline __u8 info_blk_hdr__flags(enum diag204_format type, void *hdr)
102{
103 if (type == INFO_SIMPLE)
104 return ((struct info_blk_hdr *)hdr)->flags;
105 else /* INFO_EXT */
106 return ((struct x_info_blk_hdr *)hdr)->flags;
107}
108
109static inline __u16 info_blk_hdr__pcpus(enum diag204_format type, void *hdr)
110{
111 if (type == INFO_SIMPLE)
112 return ((struct info_blk_hdr *)hdr)->phys_cpus;
113 else /* INFO_EXT */
114 return ((struct x_info_blk_hdr *)hdr)->phys_cpus;
115}
116
117/* Partition header */
118
119struct part_hdr {
120 __u8 pn;
121 __u8 cpus;
122 char reserved[6];
123 char part_name[LPAR_NAME_LEN];
124} __attribute__ ((packed));
125
126struct x_part_hdr {
127 __u8 pn;
128 __u8 cpus;
129 __u8 rcpus;
130 __u8 pflag;
131 __u32 mlu;
132 char part_name[LPAR_NAME_LEN];
133 char lpc_name[8];
134 char os_name[8];
135 __u64 online_cs;
136 __u64 online_es;
137 __u8 upid;
138 char reserved1[3];
139 __u32 group_mlu;
140 char group_name[8];
141 char reserved2[32];
142} __attribute__ ((packed));
143
144static inline int part_hdr__size(enum diag204_format type)
145{
146 if (type == INFO_SIMPLE)
147 return sizeof(struct part_hdr);
148 else /* INFO_EXT */
149 return sizeof(struct x_part_hdr);
150}
151
152static inline __u8 part_hdr__rcpus(enum diag204_format type, void *hdr)
153{
154 if (type == INFO_SIMPLE)
155 return ((struct part_hdr *)hdr)->cpus;
156 else /* INFO_EXT */
157 return ((struct x_part_hdr *)hdr)->rcpus;
158}
159
160static inline void part_hdr__part_name(enum diag204_format type, void *hdr,
161 char *name)
162{
163 if (type == INFO_SIMPLE)
164 memcpy(name, ((struct part_hdr *)hdr)->part_name,
165 LPAR_NAME_LEN);
166 else /* INFO_EXT */
167 memcpy(name, ((struct x_part_hdr *)hdr)->part_name,
168 LPAR_NAME_LEN);
169 EBCASC(name, LPAR_NAME_LEN);
170 name[LPAR_NAME_LEN] = 0;
171 strim(name);
172}
173
174struct cpu_info {
175 __u16 cpu_addr;
176 char reserved1[2];
177 __u8 ctidx;
178 __u8 cflag;
179 __u16 weight;
180 __u64 acc_time;
181 __u64 lp_time;
182} __attribute__ ((packed));
183
184struct x_cpu_info {
185 __u16 cpu_addr;
186 char reserved1[2];
187 __u8 ctidx;
188 __u8 cflag;
189 __u16 weight;
190 __u64 acc_time;
191 __u64 lp_time;
192 __u16 min_weight;
193 __u16 cur_weight;
194 __u16 max_weight;
195 char reseved2[2];
196 __u64 online_time;
197 __u64 wait_time;
198 __u32 pma_weight;
199 __u32 polar_weight;
200 char reserved3[40];
201} __attribute__ ((packed));
202
203/* CPU info block */
204
205static inline int cpu_info__size(enum diag204_format type)
206{
207 if (type == INFO_SIMPLE)
208 return sizeof(struct cpu_info);
209 else /* INFO_EXT */
210 return sizeof(struct x_cpu_info);
211}
212
213static inline __u8 cpu_info__ctidx(enum diag204_format type, void *hdr)
214{
215 if (type == INFO_SIMPLE)
216 return ((struct cpu_info *)hdr)->ctidx;
217 else /* INFO_EXT */
218 return ((struct x_cpu_info *)hdr)->ctidx;
219}
220
221static inline __u16 cpu_info__cpu_addr(enum diag204_format type, void *hdr)
222{
223 if (type == INFO_SIMPLE)
224 return ((struct cpu_info *)hdr)->cpu_addr;
225 else /* INFO_EXT */
226 return ((struct x_cpu_info *)hdr)->cpu_addr;
227}
228
229static inline __u64 cpu_info__acc_time(enum diag204_format type, void *hdr)
230{
231 if (type == INFO_SIMPLE)
232 return ((struct cpu_info *)hdr)->acc_time;
233 else /* INFO_EXT */
234 return ((struct x_cpu_info *)hdr)->acc_time;
235}
236
237static inline __u64 cpu_info__lp_time(enum diag204_format type, void *hdr)
238{
239 if (type == INFO_SIMPLE)
240 return ((struct cpu_info *)hdr)->lp_time;
241 else /* INFO_EXT */
242 return ((struct x_cpu_info *)hdr)->lp_time;
243}
244
245static inline __u64 cpu_info__online_time(enum diag204_format type, void *hdr)
246{
247 if (type == INFO_SIMPLE)
248 return 0; /* online_time not available in simple info */
249 else /* INFO_EXT */
250 return ((struct x_cpu_info *)hdr)->online_time;
251}
252
253/* Physical header */
254
255struct phys_hdr {
256 char reserved1[1];
257 __u8 cpus;
258 char reserved2[6];
259 char mgm_name[8];
260} __attribute__ ((packed));
261
262struct x_phys_hdr {
263 char reserved1[1];
264 __u8 cpus;
265 char reserved2[6];
266 char mgm_name[8];
267 char reserved3[80];
268} __attribute__ ((packed));
269
270static inline int phys_hdr__size(enum diag204_format type)
271{
272 if (type == INFO_SIMPLE)
273 return sizeof(struct phys_hdr);
274 else /* INFO_EXT */
275 return sizeof(struct x_phys_hdr);
276}
277
278static inline __u8 phys_hdr__cpus(enum diag204_format type, void *hdr)
279{
280 if (type == INFO_SIMPLE)
281 return ((struct phys_hdr *)hdr)->cpus;
282 else /* INFO_EXT */
283 return ((struct x_phys_hdr *)hdr)->cpus;
284}
285
286/* Physical CPU info block */
287
288struct phys_cpu {
289 __u16 cpu_addr;
290 char reserved1[2];
291 __u8 ctidx;
292 char reserved2[3];
293 __u64 mgm_time;
294 char reserved3[8];
295} __attribute__ ((packed));
296
297struct x_phys_cpu {
298 __u16 cpu_addr;
299 char reserved1[2];
300 __u8 ctidx;
301 char reserved2[3];
302 __u64 mgm_time;
303 char reserved3[80];
304} __attribute__ ((packed));
305
306static inline int phys_cpu__size(enum diag204_format type)
307{
308 if (type == INFO_SIMPLE)
309 return sizeof(struct phys_cpu);
310 else /* INFO_EXT */
311 return sizeof(struct x_phys_cpu);
312}
313
314static inline __u16 phys_cpu__cpu_addr(enum diag204_format type, void *hdr)
315{
316 if (type == INFO_SIMPLE)
317 return ((struct phys_cpu *)hdr)->cpu_addr;
318 else /* INFO_EXT */
319 return ((struct x_phys_cpu *)hdr)->cpu_addr;
320}
321
322static inline __u64 phys_cpu__mgm_time(enum diag204_format type, void *hdr)
323{
324 if (type == INFO_SIMPLE)
325 return ((struct phys_cpu *)hdr)->mgm_time;
326 else /* INFO_EXT */
327 return ((struct x_phys_cpu *)hdr)->mgm_time;
328}
329
330static inline __u64 phys_cpu__ctidx(enum diag204_format type, void *hdr)
331{
332 if (type == INFO_SIMPLE)
333 return ((struct phys_cpu *)hdr)->ctidx;
334 else /* INFO_EXT */
335 return ((struct x_phys_cpu *)hdr)->ctidx;
336}
337
338/* Diagnose 204 functions */
339
340static int diag204(unsigned long subcode, unsigned long size, void *addr)
341{
342 register unsigned long _subcode asm("0") = subcode;
343 register unsigned long _size asm("1") = size;
344
345 asm volatile(
346 " diag %2,%0,0x204\n"
347 "0:\n"
348 EX_TABLE(0b,0b)
349 : "+d" (_subcode), "+d" (_size) : "d" (addr) : "memory");
350 if (_subcode)
351 return -1;
352 return _size;
353}
354
355/*
356 * For the old diag subcode 4 with simple data format we have to use real
357 * memory. If we use subcode 6 or 7 with extended data format, we can (and
358 * should) use vmalloc, since we need a lot of memory in that case. Currently
359 * up to 93 pages!
360 */
361
362static void diag204_free_buffer(void)
363{
364 if (!diag204_buf)
365 return;
366 if (diag204_buf_vmalloc) {
367 vfree(diag204_buf_vmalloc);
368 diag204_buf_vmalloc = NULL;
369 } else {
370 free_pages((unsigned long) diag204_buf, 0);
371 }
372 diag204_buf = NULL;
373}
374
375static void *page_align_ptr(void *ptr)
376{
377 return (void *) PAGE_ALIGN((unsigned long) ptr);
378}
379
380static void *diag204_alloc_vbuf(int pages)
381{
382 /* The buffer has to be page aligned! */
383 diag204_buf_vmalloc = vmalloc(PAGE_SIZE * (pages + 1));
384 if (!diag204_buf_vmalloc)
385 return ERR_PTR(-ENOMEM);
386 diag204_buf = page_align_ptr(diag204_buf_vmalloc);
387 diag204_buf_pages = pages;
388 return diag204_buf;
389}
390
391static void *diag204_alloc_rbuf(void)
392{
393 diag204_buf = (void*)__get_free_pages(GFP_KERNEL,0);
394 if (!diag204_buf)
395 return ERR_PTR(-ENOMEM);
396 diag204_buf_pages = 1;
397 return diag204_buf;
398}
399
400static void *diag204_get_buffer(enum diag204_format fmt, int *pages)
401{
402 if (diag204_buf) {
403 *pages = diag204_buf_pages;
404 return diag204_buf;
405 }
406 if (fmt == INFO_SIMPLE) {
407 *pages = 1;
408 return diag204_alloc_rbuf();
409 } else {/* INFO_EXT */
410 *pages = diag204((unsigned long)SUBC_RSI |
411 (unsigned long)INFO_EXT, 0, NULL);
412 if (*pages <= 0)
413 return ERR_PTR(-ENOSYS);
414 else
415 return diag204_alloc_vbuf(*pages);
416 }
417}
418
419/*
420 * diag204_probe() has to find out, which type of diagnose 204 implementation
421 * we have on our machine. Currently there are three possible scanarios:
422 * - subcode 4 + simple data format (only one page)
423 * - subcode 4-6 + extended data format
424 * - subcode 4-7 + extended data format
425 *
426 * Subcode 5 is used to retrieve the size of the data, provided by subcodes
427 * 6 and 7. Subcode 7 basically has the same function as subcode 6. In addition
428 * to subcode 6 it provides also information about secondary cpus.
429 * In order to get as much information as possible, we first try
430 * subcode 7, then 6 and if both fail, we use subcode 4.
431 */
432
433static int diag204_probe(void)
434{
435 void *buf;
436 int pages, rc;
437
438 buf = diag204_get_buffer(INFO_EXT, &pages);
439 if (!IS_ERR(buf)) {
440 if (diag204((unsigned long)SUBC_STIB7 |
441 (unsigned long)INFO_EXT, pages, buf) >= 0) {
442 diag204_store_sc = SUBC_STIB7;
443 diag204_info_type = INFO_EXT;
444 goto out;
445 }
446 if (diag204((unsigned long)SUBC_STIB6 |
447 (unsigned long)INFO_EXT, pages, buf) >= 0) {
448 diag204_store_sc = SUBC_STIB6;
449 diag204_info_type = INFO_EXT;
450 goto out;
451 }
452 diag204_free_buffer();
453 }
454
455 /* subcodes 6 and 7 failed, now try subcode 4 */
456
457 buf = diag204_get_buffer(INFO_SIMPLE, &pages);
458 if (IS_ERR(buf)) {
459 rc = PTR_ERR(buf);
460 goto fail_alloc;
461 }
462 if (diag204((unsigned long)SUBC_STIB4 |
463 (unsigned long)INFO_SIMPLE, pages, buf) >= 0) {
464 diag204_store_sc = SUBC_STIB4;
465 diag204_info_type = INFO_SIMPLE;
466 goto out;
467 } else {
468 rc = -ENOSYS;
469 goto fail_store;
470 }
471out:
472 rc = 0;
473fail_store:
474 diag204_free_buffer();
475fail_alloc:
476 return rc;
477}
478
479static int diag204_do_store(void *buf, int pages)
480{
481 int rc;
482
483 rc = diag204((unsigned long) diag204_store_sc |
484 (unsigned long) diag204_info_type, pages, buf);
485 return rc < 0 ? -ENOSYS : 0;
486}
487
488static void *diag204_store(void)
489{
490 void *buf;
491 int pages, rc;
492
493 buf = diag204_get_buffer(diag204_info_type, &pages);
494 if (IS_ERR(buf))
495 goto out;
496 rc = diag204_do_store(buf, pages);
497 if (rc)
498 return ERR_PTR(rc);
499out:
500 return buf;
501}
502
503/* Diagnose 224 functions */
504
505static int diag224(void *ptr)
506{
507 int rc = -EOPNOTSUPP;
508
509 asm volatile(
510 " diag %1,%2,0x224\n"
511 "0: lhi %0,0x0\n"
512 "1:\n"
513 EX_TABLE(0b,1b)
514 : "+d" (rc) :"d" (0), "d" (ptr) : "memory");
515 return rc;
516}
517
518static int diag224_get_name_table(void)
519{
520 /* memory must be below 2GB */
521 diag224_cpu_names = kmalloc(PAGE_SIZE, GFP_KERNEL | GFP_DMA);
522 if (!diag224_cpu_names)
523 return -ENOMEM;
524 if (diag224(diag224_cpu_names)) {
525 kfree(diag224_cpu_names);
526 return -EOPNOTSUPP;
527 }
528 EBCASC(diag224_cpu_names + 16, (*diag224_cpu_names + 1) * 16);
529 return 0;
530}
531
532static void diag224_delete_name_table(void)
533{
534 kfree(diag224_cpu_names);
535}
536
537static int diag224_idx2name(int index, char *name)
538{
539 memcpy(name, diag224_cpu_names + ((index + 1) * CPU_NAME_LEN),
540 CPU_NAME_LEN);
541 name[CPU_NAME_LEN] = 0;
542 strim(name);
543 return 0;
544}
545
546struct dbfs_d204_hdr {
547 u64 len; /* Length of d204 buffer without header */
548 u16 version; /* Version of header */
549 u8 sc; /* Used subcode */
550 char reserved[53];
551} __attribute__ ((packed));
552
553struct dbfs_d204 {
554 struct dbfs_d204_hdr hdr; /* 64 byte header */
555 char buf[]; /* d204 buffer */
556} __attribute__ ((packed));
557
558static int dbfs_d204_create(void **data, void **data_free_ptr, size_t *size)
559{
560 struct dbfs_d204 *d204;
561 int rc, buf_size;
562 void *base;
563
564 buf_size = PAGE_SIZE * (diag204_buf_pages + 1) + sizeof(d204->hdr);
565 base = vmalloc(buf_size);
566 if (!base)
567 return -ENOMEM;
568 memset(base, 0, buf_size);
569 d204 = page_align_ptr(base + sizeof(d204->hdr)) - sizeof(d204->hdr);
570 rc = diag204_do_store(d204->buf, diag204_buf_pages);
571 if (rc) {
572 vfree(base);
573 return rc;
574 }
575 d204->hdr.version = DBFS_D204_HDR_VERSION;
576 d204->hdr.len = PAGE_SIZE * diag204_buf_pages;
577 d204->hdr.sc = diag204_store_sc;
578 *data = d204;
579 *data_free_ptr = base;
580 *size = d204->hdr.len + sizeof(struct dbfs_d204_hdr);
581 return 0;
582}
583
584static struct hypfs_dbfs_file dbfs_file_d204 = {
585 .name = "diag_204",
586 .data_create = dbfs_d204_create,
587 .data_free = vfree,
588};
589
590__init int hypfs_diag_init(void)
591{
592 int rc;
593
594 if (diag204_probe()) {
595 pr_err("The hardware system does not support hypfs\n");
596 return -ENODATA;
597 }
598 if (diag204_info_type == INFO_EXT) {
599 rc = hypfs_dbfs_create_file(&dbfs_file_d204);
600 if (rc)
601 return rc;
602 }
603 if (MACHINE_IS_LPAR) {
604 rc = diag224_get_name_table();
605 if (rc) {
606 pr_err("The hardware system does not provide all "
607 "functions required by hypfs\n");
608 debugfs_remove(dbfs_d204_file);
609 return rc;
610 }
611 }
612 return 0;
613}
614
615void hypfs_diag_exit(void)
616{
617 debugfs_remove(dbfs_d204_file);
618 diag224_delete_name_table();
619 diag204_free_buffer();
620 hypfs_dbfs_remove_file(&dbfs_file_d204);
621}
622
623/*
624 * Functions to create the directory structure
625 * *******************************************
626 */
627
628static int hypfs_create_cpu_files(struct super_block *sb,
629 struct dentry *cpus_dir, void *cpu_info)
630{
631 struct dentry *cpu_dir;
632 char buffer[TMP_SIZE];
633 void *rc;
634
635 snprintf(buffer, TMP_SIZE, "%d", cpu_info__cpu_addr(diag204_info_type,
636 cpu_info));
637 cpu_dir = hypfs_mkdir(sb, cpus_dir, buffer);
638 rc = hypfs_create_u64(sb, cpu_dir, "mgmtime",
639 cpu_info__acc_time(diag204_info_type, cpu_info) -
640 cpu_info__lp_time(diag204_info_type, cpu_info));
641 if (IS_ERR(rc))
642 return PTR_ERR(rc);
643 rc = hypfs_create_u64(sb, cpu_dir, "cputime",
644 cpu_info__lp_time(diag204_info_type, cpu_info));
645 if (IS_ERR(rc))
646 return PTR_ERR(rc);
647 if (diag204_info_type == INFO_EXT) {
648 rc = hypfs_create_u64(sb, cpu_dir, "onlinetime",
649 cpu_info__online_time(diag204_info_type,
650 cpu_info));
651 if (IS_ERR(rc))
652 return PTR_ERR(rc);
653 }
654 diag224_idx2name(cpu_info__ctidx(diag204_info_type, cpu_info), buffer);
655 rc = hypfs_create_str(sb, cpu_dir, "type", buffer);
656 if (IS_ERR(rc))
657 return PTR_ERR(rc);
658 return 0;
659}
660
661static void *hypfs_create_lpar_files(struct super_block *sb,
662 struct dentry *systems_dir, void *part_hdr)
663{
664 struct dentry *cpus_dir;
665 struct dentry *lpar_dir;
666 char lpar_name[LPAR_NAME_LEN + 1];
667 void *cpu_info;
668 int i;
669
670 part_hdr__part_name(diag204_info_type, part_hdr, lpar_name);
671 lpar_name[LPAR_NAME_LEN] = 0;
672 lpar_dir = hypfs_mkdir(sb, systems_dir, lpar_name);
673 if (IS_ERR(lpar_dir))
674 return lpar_dir;
675 cpus_dir = hypfs_mkdir(sb, lpar_dir, "cpus");
676 if (IS_ERR(cpus_dir))
677 return cpus_dir;
678 cpu_info = part_hdr + part_hdr__size(diag204_info_type);
679 for (i = 0; i < part_hdr__rcpus(diag204_info_type, part_hdr); i++) {
680 int rc;
681 rc = hypfs_create_cpu_files(sb, cpus_dir, cpu_info);
682 if (rc)
683 return ERR_PTR(rc);
684 cpu_info += cpu_info__size(diag204_info_type);
685 }
686 return cpu_info;
687}
688
689static int hypfs_create_phys_cpu_files(struct super_block *sb,
690 struct dentry *cpus_dir, void *cpu_info)
691{
692 struct dentry *cpu_dir;
693 char buffer[TMP_SIZE];
694 void *rc;
695
696 snprintf(buffer, TMP_SIZE, "%i", phys_cpu__cpu_addr(diag204_info_type,
697 cpu_info));
698 cpu_dir = hypfs_mkdir(sb, cpus_dir, buffer);
699 if (IS_ERR(cpu_dir))
700 return PTR_ERR(cpu_dir);
701 rc = hypfs_create_u64(sb, cpu_dir, "mgmtime",
702 phys_cpu__mgm_time(diag204_info_type, cpu_info));
703 if (IS_ERR(rc))
704 return PTR_ERR(rc);
705 diag224_idx2name(phys_cpu__ctidx(diag204_info_type, cpu_info), buffer);
706 rc = hypfs_create_str(sb, cpu_dir, "type", buffer);
707 if (IS_ERR(rc))
708 return PTR_ERR(rc);
709 return 0;
710}
711
712static void *hypfs_create_phys_files(struct super_block *sb,
713 struct dentry *parent_dir, void *phys_hdr)
714{
715 int i;
716 void *cpu_info;
717 struct dentry *cpus_dir;
718
719 cpus_dir = hypfs_mkdir(sb, parent_dir, "cpus");
720 if (IS_ERR(cpus_dir))
721 return cpus_dir;
722 cpu_info = phys_hdr + phys_hdr__size(diag204_info_type);
723 for (i = 0; i < phys_hdr__cpus(diag204_info_type, phys_hdr); i++) {
724 int rc;
725 rc = hypfs_create_phys_cpu_files(sb, cpus_dir, cpu_info);
726 if (rc)
727 return ERR_PTR(rc);
728 cpu_info += phys_cpu__size(diag204_info_type);
729 }
730 return cpu_info;
731}
732
733int hypfs_diag_create_files(struct super_block *sb, struct dentry *root)
734{
735 struct dentry *systems_dir, *hyp_dir;
736 void *time_hdr, *part_hdr;
737 int i, rc;
738 void *buffer, *ptr;
739
740 buffer = diag204_store();
741 if (IS_ERR(buffer))
742 return PTR_ERR(buffer);
743
744 systems_dir = hypfs_mkdir(sb, root, "systems");
745 if (IS_ERR(systems_dir)) {
746 rc = PTR_ERR(systems_dir);
747 goto err_out;
748 }
749 time_hdr = (struct x_info_blk_hdr *)buffer;
750 part_hdr = time_hdr + info_blk_hdr__size(diag204_info_type);
751 for (i = 0; i < info_blk_hdr__npar(diag204_info_type, time_hdr); i++) {
752 part_hdr = hypfs_create_lpar_files(sb, systems_dir, part_hdr);
753 if (IS_ERR(part_hdr)) {
754 rc = PTR_ERR(part_hdr);
755 goto err_out;
756 }
757 }
758 if (info_blk_hdr__flags(diag204_info_type, time_hdr) & LPAR_PHYS_FLG) {
759 ptr = hypfs_create_phys_files(sb, root, part_hdr);
760 if (IS_ERR(ptr)) {
761 rc = PTR_ERR(ptr);
762 goto err_out;
763 }
764 }
765 hyp_dir = hypfs_mkdir(sb, root, "hyp");
766 if (IS_ERR(hyp_dir)) {
767 rc = PTR_ERR(hyp_dir);
768 goto err_out;
769 }
770 ptr = hypfs_create_str(sb, hyp_dir, "type", "LPAR Hypervisor");
771 if (IS_ERR(ptr)) {
772 rc = PTR_ERR(ptr);
773 goto err_out;
774 }
775 rc = 0;
776
777err_out:
778 return rc;
779}