aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/s390/char
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/s390/char')
-rw-r--r--drivers/s390/char/Makefile3
-rw-r--r--drivers/s390/char/sclp.h2
-rw-r--r--drivers/s390/char/sclp_sdias.c255
-rw-r--r--drivers/s390/char/zcore.c651
4 files changed, 911 insertions, 0 deletions
diff --git a/drivers/s390/char/Makefile b/drivers/s390/char/Makefile
index 5fd581c22db3..a0f6db21855a 100644
--- a/drivers/s390/char/Makefile
+++ b/drivers/s390/char/Makefile
@@ -29,3 +29,6 @@ obj-$(CONFIG_S390_TAPE_34XX) += tape_34xx.o
29obj-$(CONFIG_S390_TAPE_3590) += tape_3590.o 29obj-$(CONFIG_S390_TAPE_3590) += tape_3590.o
30obj-$(CONFIG_MONREADER) += monreader.o 30obj-$(CONFIG_MONREADER) += monreader.o
31obj-$(CONFIG_MONWRITER) += monwriter.o 31obj-$(CONFIG_MONWRITER) += monwriter.o
32
33zcore_mod-objs := sclp_sdias.o zcore.o
34obj-$(CONFIG_ZFCPDUMP) += zcore_mod.o
diff --git a/drivers/s390/char/sclp.h b/drivers/s390/char/sclp.h
index 7d29ab45a6ed..6402e943436f 100644
--- a/drivers/s390/char/sclp.h
+++ b/drivers/s390/char/sclp.h
@@ -27,6 +27,7 @@
27#define EvTyp_CntlProgIdent 0x0B 27#define EvTyp_CntlProgIdent 0x0B
28#define EvTyp_SigQuiesce 0x1D 28#define EvTyp_SigQuiesce 0x1D
29#define EvTyp_VT220Msg 0x1A 29#define EvTyp_VT220Msg 0x1A
30#define EvTyp_SDIAS 0x1C
30 31
31#define EvTyp_OpCmd_Mask 0x80000000 32#define EvTyp_OpCmd_Mask 0x80000000
32#define EvTyp_Msg_Mask 0x40000000 33#define EvTyp_Msg_Mask 0x40000000
@@ -36,6 +37,7 @@
36#define EvTyp_CtlProgIdent_Mask 0x00200000 37#define EvTyp_CtlProgIdent_Mask 0x00200000
37#define EvTyp_SigQuiesce_Mask 0x00000008 38#define EvTyp_SigQuiesce_Mask 0x00000008
38#define EvTyp_VT220Msg_Mask 0x00000040 39#define EvTyp_VT220Msg_Mask 0x00000040
40#define EvTyp_SDIAS_Mask 0x00000010
39 41
40#define GnrlMsgFlgs_DOM 0x8000 42#define GnrlMsgFlgs_DOM 0x8000
41#define GnrlMsgFlgs_SndAlrm 0x4000 43#define GnrlMsgFlgs_SndAlrm 0x4000
diff --git a/drivers/s390/char/sclp_sdias.c b/drivers/s390/char/sclp_sdias.c
new file mode 100644
index 000000000000..06a4d0897232
--- /dev/null
+++ b/drivers/s390/char/sclp_sdias.c
@@ -0,0 +1,255 @@
1/*
2 * Sclp "store data in absolut storage"
3 *
4 * Copyright IBM Corp. 2003,2007
5 * Author(s): Michael Holzheu
6 */
7
8#include <linux/sched.h>
9#include <asm/sclp.h>
10#include <asm/debug.h>
11#include <asm/ipl.h>
12#include "sclp.h"
13#include "sclp_rw.h"
14
15#define TRACE(x...) debug_sprintf_event(sdias_dbf, 1, x)
16#define ERROR_MSG(x...) printk ( KERN_ALERT "SDIAS: " x )
17
18#define SDIAS_RETRIES 300
19#define SDIAS_SLEEP_TICKS 50
20
21#define EQ_STORE_DATA 0x0
22#define EQ_SIZE 0x1
23#define DI_FCP_DUMP 0x0
24#define ASA_SIZE_32 0x0
25#define ASA_SIZE_64 0x1
26#define EVSTATE_ALL_STORED 0x0
27#define EVSTATE_NO_DATA 0x3
28#define EVSTATE_PART_STORED 0x10
29
30static struct debug_info *sdias_dbf;
31
32static struct sclp_register sclp_sdias_register = {
33 .send_mask = EvTyp_SDIAS_Mask,
34};
35
36struct sdias_evbuf {
37 struct evbuf_header hdr;
38 u8 event_qual;
39 u8 data_id;
40 u64 reserved2;
41 u32 event_id;
42 u16 reserved3;
43 u8 asa_size;
44 u8 event_status;
45 u32 reserved4;
46 u32 blk_cnt;
47 u64 asa;
48 u32 reserved5;
49 u32 fbn;
50 u32 reserved6;
51 u32 lbn;
52 u16 reserved7;
53 u16 dbs;
54} __attribute__((packed));
55
56struct sdias_sccb {
57 struct sccb_header hdr;
58 struct sdias_evbuf evbuf;
59} __attribute__((packed));
60
61static struct sdias_sccb sccb __attribute__((aligned(4096)));
62
63static int sclp_req_done;
64static wait_queue_head_t sdias_wq;
65static DEFINE_MUTEX(sdias_mutex);
66
67static void sdias_callback(struct sclp_req *request, void *data)
68{
69 struct sdias_sccb *sccb;
70
71 sccb = (struct sdias_sccb *) request->sccb;
72 sclp_req_done = 1;
73 wake_up(&sdias_wq); /* Inform caller, that request is complete */
74 TRACE("callback done\n");
75}
76
77static int sdias_sclp_send(struct sclp_req *req)
78{
79 int retries;
80 int rc;
81
82 for (retries = SDIAS_RETRIES; retries; retries--) {
83 sclp_req_done = 0;
84 TRACE("add request\n");
85 rc = sclp_add_request(req);
86 if (rc) {
87 /* not initiated, wait some time and retry */
88 set_current_state(TASK_INTERRUPTIBLE);
89 TRACE("add request failed: rc = %i\n",rc);
90 schedule_timeout(SDIAS_SLEEP_TICKS);
91 continue;
92 }
93 /* initiated, wait for completion of service call */
94 wait_event(sdias_wq, (sclp_req_done == 1));
95 if (req->status == SCLP_REQ_FAILED) {
96 TRACE("sclp request failed\n");
97 rc = -EIO;
98 continue;
99 }
100 TRACE("request done\n");
101 break;
102 }
103 return rc;
104}
105
106/*
107 * Get number of blocks (4K) available in the HSA
108 */
109int sclp_sdias_blk_count(void)
110{
111 struct sclp_req request;
112 int rc;
113
114 mutex_lock(&sdias_mutex);
115
116 memset(&sccb, 0, sizeof(sccb));
117 memset(&request, 0, sizeof(request));
118
119 sccb.hdr.length = sizeof(sccb);
120 sccb.evbuf.hdr.length = sizeof(struct sdias_evbuf);
121 sccb.evbuf.hdr.type = EvTyp_SDIAS;
122 sccb.evbuf.event_qual = EQ_SIZE;
123 sccb.evbuf.data_id = DI_FCP_DUMP;
124 sccb.evbuf.event_id = 4712;
125 sccb.evbuf.dbs = 1;
126
127 request.sccb = &sccb;
128 request.command = SCLP_CMDW_WRITE_EVENT_DATA;
129 request.status = SCLP_REQ_FILLED;
130 request.callback = sdias_callback;
131
132 rc = sdias_sclp_send(&request);
133 if (rc) {
134 ERROR_MSG("sclp_send failed for get_nr_blocks\n");
135 goto out;
136 }
137 if (sccb.hdr.response_code != 0x0020) {
138 TRACE("send failed: %x\n", sccb.hdr.response_code);
139 rc = -EIO;
140 goto out;
141 }
142
143 switch (sccb.evbuf.event_status) {
144 case 0:
145 rc = sccb.evbuf.blk_cnt;
146 break;
147 default:
148 ERROR_MSG("SCLP error: %x\n", sccb.evbuf.event_status);
149 rc = -EIO;
150 goto out;
151 }
152 TRACE("%i blocks\n", rc);
153out:
154 mutex_unlock(&sdias_mutex);
155 return rc;
156}
157
158/*
159 * Copy from HSA to absolute storage (not reentrant):
160 *
161 * @dest : Address of buffer where data should be copied
162 * @start_blk: Start Block (beginning with 1)
163 * @nr_blks : Number of 4K blocks to copy
164 *
165 * Return Value: 0 : Requested 'number' of blocks of data copied
166 * <0: ERROR - negative event status
167 */
168int sclp_sdias_copy(void *dest, int start_blk, int nr_blks)
169{
170 struct sclp_req request;
171 int rc;
172
173 mutex_lock(&sdias_mutex);
174
175 memset(&sccb, 0, sizeof(sccb));
176 memset(&request, 0, sizeof(request));
177
178 sccb.hdr.length = sizeof(sccb);
179 sccb.evbuf.hdr.length = sizeof(struct sdias_evbuf);
180 sccb.evbuf.hdr.type = EvTyp_SDIAS;
181 sccb.evbuf.hdr.flags = 0;
182 sccb.evbuf.event_qual = EQ_STORE_DATA;
183 sccb.evbuf.data_id = DI_FCP_DUMP;
184 sccb.evbuf.event_id = 4712;
185#ifdef __s390x__
186 sccb.evbuf.asa_size = ASA_SIZE_64;
187#else
188 sccb.evbuf.asa_size = ASA_SIZE_32;
189#endif
190 sccb.evbuf.event_status = 0;
191 sccb.evbuf.blk_cnt = nr_blks;
192 sccb.evbuf.asa = (unsigned long)dest;
193 sccb.evbuf.fbn = start_blk;
194 sccb.evbuf.lbn = 0;
195 sccb.evbuf.dbs = 1;
196
197 request.sccb = &sccb;
198 request.command = SCLP_CMDW_WRITE_EVENT_DATA;
199 request.status = SCLP_REQ_FILLED;
200 request.callback = sdias_callback;
201
202 rc = sdias_sclp_send(&request);
203 if (rc) {
204 ERROR_MSG("sclp_send failed: %x\n", rc);
205 goto out;
206 }
207 if (sccb.hdr.response_code != 0x0020) {
208 TRACE("copy failed: %x\n", sccb.hdr.response_code);
209 rc = -EIO;
210 goto out;
211 }
212
213 switch (sccb.evbuf.event_status) {
214 case EVSTATE_ALL_STORED:
215 TRACE("all stored\n");
216 case EVSTATE_PART_STORED:
217 TRACE("part stored: %i\n", sccb.evbuf.blk_cnt);
218 break;
219 case EVSTATE_NO_DATA:
220 TRACE("no data\n");
221 default:
222 ERROR_MSG("Error from SCLP while copying hsa. "
223 "Event status = %x\n",
224 sccb.evbuf.event_status);
225 rc = -EIO;
226 }
227out:
228 mutex_unlock(&sdias_mutex);
229 return rc;
230}
231
232int __init sdias_init(void)
233{
234 int rc;
235
236 if (ipl_info.type != IPL_TYPE_FCP_DUMP)
237 return 0;
238 sdias_dbf = debug_register("dump_sdias", 4, 1, 4 * sizeof(long));
239 debug_register_view(sdias_dbf, &debug_sprintf_view);
240 debug_set_level(sdias_dbf, 6);
241 rc = sclp_register(&sclp_sdias_register);
242 if (rc) {
243 ERROR_MSG("sclp register failed\n");
244 return rc;
245 }
246 init_waitqueue_head(&sdias_wq);
247 TRACE("init done\n");
248 return 0;
249}
250
251void __exit sdias_exit(void)
252{
253 debug_unregister(sdias_dbf);
254 sclp_unregister(&sclp_sdias_register);
255}
diff --git a/drivers/s390/char/zcore.c b/drivers/s390/char/zcore.c
new file mode 100644
index 000000000000..89d439316a53
--- /dev/null
+++ b/drivers/s390/char/zcore.c
@@ -0,0 +1,651 @@
1/*
2 * zcore module to export memory content and register sets for creating system
3 * dumps on SCSI disks (zfcpdump). The "zcore/mem" debugfs file shows the same
4 * dump format as s390 standalone dumps.
5 *
6 * For more information please refer to Documentation/s390/zfcpdump.txt
7 *
8 * Copyright IBM Corp. 2003,2007
9 * Author(s): Michael Holzheu
10 */
11
12#include <linux/init.h>
13#include <linux/miscdevice.h>
14#include <linux/utsname.h>
15#include <linux/debugfs.h>
16#include <asm/ipl.h>
17#include <asm/sclp.h>
18#include <asm/setup.h>
19#include <asm/sigp.h>
20#include <asm/uaccess.h>
21#include <asm/debug.h>
22#include <asm/processor.h>
23#include <asm/irqflags.h>
24
25#define TRACE(x...) debug_sprintf_event(zcore_dbf, 1, x)
26#define MSG(x...) printk( KERN_ALERT x )
27#define ERROR_MSG(x...) printk ( KERN_ALERT "DUMP: " x )
28
29#define TO_USER 0
30#define TO_KERNEL 1
31
32enum arch_id {
33 ARCH_S390 = 0,
34 ARCH_S390X = 1,
35};
36
37/* dump system info */
38
39struct sys_info {
40 enum arch_id arch;
41 unsigned long sa_base;
42 u32 sa_size;
43 int cpu_map[NR_CPUS];
44 unsigned long mem_size;
45 union save_area lc_mask;
46};
47
48static struct sys_info sys_info;
49static struct debug_info *zcore_dbf;
50static int hsa_available;
51static struct dentry *zcore_dir;
52static struct dentry *zcore_file;
53
54/*
55 * Copy memory from HSA to kernel or user memory (not reentrant):
56 *
57 * @dest: Kernel or user buffer where memory should be copied to
58 * @src: Start address within HSA where data should be copied
59 * @count: Size of buffer, which should be copied
60 * @mode: Either TO_KERNEL or TO_USER
61 */
62static int memcpy_hsa(void *dest, unsigned long src, size_t count, int mode)
63{
64 int offs, blk_num;
65 static char buf[PAGE_SIZE] __attribute__((__aligned__(PAGE_SIZE)));
66
67 if (count == 0)
68 return 0;
69
70 /* copy first block */
71 offs = 0;
72 if ((src % PAGE_SIZE) != 0) {
73 blk_num = src / PAGE_SIZE + 2;
74 if (sclp_sdias_copy(buf, blk_num, 1)) {
75 TRACE("sclp_sdias_copy() failed\n");
76 return -EIO;
77 }
78 offs = min((PAGE_SIZE - (src % PAGE_SIZE)), count);
79 if (mode == TO_USER) {
80 if (copy_to_user((__force __user void*) dest,
81 buf + (src % PAGE_SIZE), offs))
82 return -EFAULT;
83 } else
84 memcpy(dest, buf + (src % PAGE_SIZE), offs);
85 }
86 if (offs == count)
87 goto out;
88
89 /* copy middle */
90 for (; (offs + PAGE_SIZE) <= count; offs += PAGE_SIZE) {
91 blk_num = (src + offs) / PAGE_SIZE + 2;
92 if (sclp_sdias_copy(buf, blk_num, 1)) {
93 TRACE("sclp_sdias_copy() failed\n");
94 return -EIO;
95 }
96 if (mode == TO_USER) {
97 if (copy_to_user((__force __user void*) dest + offs,
98 buf, PAGE_SIZE))
99 return -EFAULT;
100 } else
101 memcpy(dest + offs, buf, PAGE_SIZE);
102 }
103 if (offs == count)
104 goto out;
105
106 /* copy last block */
107 blk_num = (src + offs) / PAGE_SIZE + 2;
108 if (sclp_sdias_copy(buf, blk_num, 1)) {
109 TRACE("sclp_sdias_copy() failed\n");
110 return -EIO;
111 }
112 if (mode == TO_USER) {
113 if (copy_to_user((__force __user void*) dest + offs, buf,
114 PAGE_SIZE))
115 return -EFAULT;
116 } else
117 memcpy(dest + offs, buf, count - offs);
118out:
119 return 0;
120}
121
122static int memcpy_hsa_user(void __user *dest, unsigned long src, size_t count)
123{
124 return memcpy_hsa((void __force *) dest, src, count, TO_USER);
125}
126
127static int memcpy_hsa_kernel(void *dest, unsigned long src, size_t count)
128{
129 return memcpy_hsa(dest, src, count, TO_KERNEL);
130}
131
132static int memcpy_real(void *dest, unsigned long src, size_t count)
133{
134 unsigned long flags;
135 int rc = -EFAULT;
136 register unsigned long _dest asm("2") = (unsigned long) dest;
137 register unsigned long _len1 asm("3") = (unsigned long) count;
138 register unsigned long _src asm("4") = src;
139 register unsigned long _len2 asm("5") = (unsigned long) count;
140
141 if (count == 0)
142 return 0;
143 flags = __raw_local_irq_stnsm(0xf8); /* switch to real mode */
144 asm volatile (
145 "0: mvcle %1,%2,0x0\n"
146 "1: jo 0b\n"
147 " lhi %0,0x0\n"
148 "2:\n"
149 EX_TABLE(1b,2b)
150 : "+d" (rc)
151 : "d" (_dest), "d" (_src), "d" (_len1), "d" (_len2)
152 : "cc", "memory");
153 __raw_local_irq_ssm(flags);
154
155 return rc;
156}
157
158static int memcpy_real_user(__user void *dest, unsigned long src, size_t count)
159{
160 static char buf[4096];
161 int offs = 0, size;
162
163 while (offs < count) {
164 size = min(sizeof(buf), count - offs);
165 if (memcpy_real(buf, src + offs, size))
166 return -EFAULT;
167 if (copy_to_user(dest + offs, buf, size))
168 return -EFAULT;
169 offs += size;
170 }
171 return 0;
172}
173
174#ifdef __s390x__
175/*
176 * Convert s390x (64 bit) cpu info to s390 (32 bit) cpu info
177 */
178static void __init s390x_to_s390_regs(union save_area *out, union save_area *in,
179 int cpu)
180{
181 int i;
182
183 for (i = 0; i < 16; i++) {
184 out->s390.gp_regs[i] = in->s390x.gp_regs[i] & 0x00000000ffffffff;
185 out->s390.acc_regs[i] = in->s390x.acc_regs[i];
186 out->s390.ctrl_regs[i] =
187 in->s390x.ctrl_regs[i] & 0x00000000ffffffff;
188 }
189 /* locore for 31 bit has only space for fpregs 0,2,4,6 */
190 out->s390.fp_regs[0] = in->s390x.fp_regs[0];
191 out->s390.fp_regs[1] = in->s390x.fp_regs[2];
192 out->s390.fp_regs[2] = in->s390x.fp_regs[4];
193 out->s390.fp_regs[3] = in->s390x.fp_regs[6];
194 memcpy(&(out->s390.psw[0]), &(in->s390x.psw[0]), 4);
195 out->s390.psw[1] |= 0x8; /* set bit 12 */
196 memcpy(&(out->s390.psw[4]),&(in->s390x.psw[12]), 4);
197 out->s390.psw[4] |= 0x80; /* set (31bit) addressing bit */
198 out->s390.pref_reg = in->s390x.pref_reg;
199 out->s390.timer = in->s390x.timer;
200 out->s390.clk_cmp = in->s390x.clk_cmp;
201}
202
203static void __init s390x_to_s390_save_areas(void)
204{
205 int i = 1;
206 static union save_area tmp;
207
208 while (zfcpdump_save_areas[i]) {
209 s390x_to_s390_regs(&tmp, zfcpdump_save_areas[i], i);
210 memcpy(zfcpdump_save_areas[i], &tmp, sizeof(tmp));
211 i++;
212 }
213}
214
215#endif /* __s390x__ */
216
217static int __init init_cpu_info(enum arch_id arch)
218{
219 union save_area *sa;
220
221 /* get info for boot cpu from lowcore, stored in the HSA */
222
223 sa = kmalloc(sizeof(*sa), GFP_KERNEL);
224 if (!sa) {
225 ERROR_MSG("kmalloc failed: %s: %i\n",__FUNCTION__, __LINE__);
226 return -ENOMEM;
227 }
228 if (memcpy_hsa_kernel(sa, sys_info.sa_base, sys_info.sa_size) < 0) {
229 ERROR_MSG("could not copy from HSA\n");
230 kfree(sa);
231 return -EIO;
232 }
233 zfcpdump_save_areas[0] = sa;
234
235#ifdef __s390x__
236 /* convert s390x regs to s390, if we are dumping an s390 Linux */
237
238 if (arch == ARCH_S390)
239 s390x_to_s390_save_areas();
240#endif
241
242 return 0;
243}
244
245static DEFINE_MUTEX(zcore_mutex);
246
247#define DUMP_VERSION 0x3
248#define DUMP_MAGIC 0xa8190173618f23fdULL
249#define DUMP_ARCH_S390X 2
250#define DUMP_ARCH_S390 1
251#define HEADER_SIZE 4096
252
253/* dump header dumped according to s390 crash dump format */
254
255struct zcore_header {
256 u64 magic;
257 u32 version;
258 u32 header_size;
259 u32 dump_level;
260 u32 page_size;
261 u64 mem_size;
262 u64 mem_start;
263 u64 mem_end;
264 u32 num_pages;
265 u32 pad1;
266 u64 tod;
267 cpuid_t cpu_id;
268 u32 arch_id;
269 u32 build_arch;
270 char pad2[4016];
271} __attribute__((packed,__aligned__(16)));
272
273static struct zcore_header zcore_header = {
274 .magic = DUMP_MAGIC,
275 .version = DUMP_VERSION,
276 .header_size = 4096,
277 .dump_level = 0,
278 .page_size = PAGE_SIZE,
279 .mem_start = 0,
280#ifdef __s390x__
281 .build_arch = DUMP_ARCH_S390X,
282#else
283 .build_arch = DUMP_ARCH_S390,
284#endif
285};
286
287/*
288 * Copy lowcore info to buffer. Use map in order to copy only register parts.
289 *
290 * @buf: User buffer
291 * @sa: Pointer to save area
292 * @sa_off: Offset in save area to copy
293 * @len: Number of bytes to copy
294 */
295static int copy_lc(void __user *buf, void *sa, int sa_off, int len)
296{
297 int i;
298 char *lc_mask = (char*)&sys_info.lc_mask;
299
300 for (i = 0; i < len; i++) {
301 if (!lc_mask[i + sa_off])
302 continue;
303 if (copy_to_user(buf + i, sa + sa_off + i, 1))
304 return -EFAULT;
305 }
306 return 0;
307}
308
309/*
310 * Copy lowcores info to memory, if necessary
311 *
312 * @buf: User buffer
313 * @addr: Start address of buffer in dump memory
314 * @count: Size of buffer
315 */
316static int zcore_add_lc(char __user *buf, unsigned long start, size_t count)
317{
318 unsigned long end;
319 int i = 0;
320
321 if (count == 0)
322 return 0;
323
324 end = start + count;
325 while (zfcpdump_save_areas[i]) {
326 unsigned long cp_start, cp_end; /* copy range */
327 unsigned long sa_start, sa_end; /* save area range */
328 unsigned long prefix;
329 unsigned long sa_off, len, buf_off;
330
331 if (sys_info.arch == ARCH_S390)
332 prefix = zfcpdump_save_areas[i]->s390.pref_reg;
333 else
334 prefix = zfcpdump_save_areas[i]->s390x.pref_reg;
335
336 sa_start = prefix + sys_info.sa_base;
337 sa_end = prefix + sys_info.sa_base + sys_info.sa_size;
338
339 if ((end < sa_start) || (start > sa_end))
340 goto next;
341 cp_start = max(start, sa_start);
342 cp_end = min(end, sa_end);
343
344 buf_off = cp_start - start;
345 sa_off = cp_start - sa_start;
346 len = cp_end - cp_start;
347
348 TRACE("copy_lc for: %lx\n", start);
349 if (copy_lc(buf + buf_off, zfcpdump_save_areas[i], sa_off, len))
350 return -EFAULT;
351next:
352 i++;
353 }
354 return 0;
355}
356
357/*
358 * Read routine for zcore character device
359 * First 4K are dump header
360 * Next 32MB are HSA Memory
361 * Rest is read from absolute Memory
362 */
363static ssize_t zcore_read(struct file *file, char __user *buf, size_t count,
364 loff_t *ppos)
365{
366 unsigned long mem_start; /* Start address in memory */
367 size_t mem_offs; /* Offset in dump memory */
368 size_t hdr_count; /* Size of header part of output buffer */
369 size_t size;
370 int rc;
371
372 mutex_lock(&zcore_mutex);
373
374 if (*ppos > (sys_info.mem_size + HEADER_SIZE)) {
375 rc = -EINVAL;
376 goto fail;
377 }
378
379 count = min(count, (size_t) (sys_info.mem_size + HEADER_SIZE - *ppos));
380
381 /* Copy dump header */
382 if (*ppos < HEADER_SIZE) {
383 size = min(count, (size_t) (HEADER_SIZE - *ppos));
384 if (copy_to_user(buf, &zcore_header + *ppos, size)) {
385 rc = -EFAULT;
386 goto fail;
387 }
388 hdr_count = size;
389 mem_start = 0;
390 } else {
391 hdr_count = 0;
392 mem_start = *ppos - HEADER_SIZE;
393 }
394
395 mem_offs = 0;
396
397 /* Copy from HSA data */
398 if (*ppos < (ZFCPDUMP_HSA_SIZE + HEADER_SIZE)) {
399 size = min((count - hdr_count), (size_t) (ZFCPDUMP_HSA_SIZE
400 - mem_start));
401 rc = memcpy_hsa_user(buf + hdr_count, mem_start, size);
402 if (rc)
403 goto fail;
404
405 mem_offs += size;
406 }
407
408 /* Copy from real mem */
409 size = count - mem_offs - hdr_count;
410 rc = memcpy_real_user(buf + hdr_count + mem_offs, mem_start + mem_offs,
411 size);
412 if (rc)
413 goto fail;
414
415 /*
416 * Since s390 dump analysis tools like lcrash or crash
417 * expect register sets in the prefix pages of the cpus,
418 * we copy them into the read buffer, if necessary.
419 * buf + hdr_count: Start of memory part of output buffer
420 * mem_start: Start memory address to copy from
421 * count - hdr_count: Size of memory area to copy
422 */
423 if (zcore_add_lc(buf + hdr_count, mem_start, count - hdr_count)) {
424 rc = -EFAULT;
425 goto fail;
426 }
427 *ppos += count;
428fail:
429 mutex_unlock(&zcore_mutex);
430 return (rc < 0) ? rc : count;
431}
432
433static int zcore_open(struct inode *inode, struct file *filp)
434{
435 if (!hsa_available)
436 return -ENODATA;
437 else
438 return capable(CAP_SYS_RAWIO) ? 0 : -EPERM;
439}
440
441static int zcore_release(struct inode *inode, struct file *filep)
442{
443 diag308(DIAG308_REL_HSA, NULL);
444 hsa_available = 0;
445 return 0;
446}
447
448static loff_t zcore_lseek(struct file *file, loff_t offset, int orig)
449{
450 loff_t rc;
451
452 mutex_lock(&zcore_mutex);
453 switch (orig) {
454 case 0:
455 file->f_pos = offset;
456 rc = file->f_pos;
457 break;
458 case 1:
459 file->f_pos += offset;
460 rc = file->f_pos;
461 break;
462 default:
463 rc = -EINVAL;
464 }
465 mutex_unlock(&zcore_mutex);
466 return rc;
467}
468
469static struct file_operations zcore_fops = {
470 .owner = THIS_MODULE,
471 .llseek = zcore_lseek,
472 .read = zcore_read,
473 .open = zcore_open,
474 .release = zcore_release,
475};
476
477
478static void __init set_s390_lc_mask(union save_area *map)
479{
480 memset(&map->s390.ext_save, 0xff, sizeof(map->s390.ext_save));
481 memset(&map->s390.timer, 0xff, sizeof(map->s390.timer));
482 memset(&map->s390.clk_cmp, 0xff, sizeof(map->s390.clk_cmp));
483 memset(&map->s390.psw, 0xff, sizeof(map->s390.psw));
484 memset(&map->s390.pref_reg, 0xff, sizeof(map->s390.pref_reg));
485 memset(&map->s390.acc_regs, 0xff, sizeof(map->s390.acc_regs));
486 memset(&map->s390.fp_regs, 0xff, sizeof(map->s390.fp_regs));
487 memset(&map->s390.gp_regs, 0xff, sizeof(map->s390.gp_regs));
488 memset(&map->s390.ctrl_regs, 0xff, sizeof(map->s390.ctrl_regs));
489}
490
491static void __init set_s390x_lc_mask(union save_area *map)
492{
493 memset(&map->s390x.fp_regs, 0xff, sizeof(map->s390x.fp_regs));
494 memset(&map->s390x.gp_regs, 0xff, sizeof(map->s390x.gp_regs));
495 memset(&map->s390x.psw, 0xff, sizeof(map->s390x.psw));
496 memset(&map->s390x.pref_reg, 0xff, sizeof(map->s390x.pref_reg));
497 memset(&map->s390x.fp_ctrl_reg, 0xff, sizeof(map->s390x.fp_ctrl_reg));
498 memset(&map->s390x.tod_reg, 0xff, sizeof(map->s390x.tod_reg));
499 memset(&map->s390x.timer, 0xff, sizeof(map->s390x.timer));
500 memset(&map->s390x.clk_cmp, 0xff, sizeof(map->s390x.clk_cmp));
501 memset(&map->s390x.acc_regs, 0xff, sizeof(map->s390x.acc_regs));
502 memset(&map->s390x.ctrl_regs, 0xff, sizeof(map->s390x.ctrl_regs));
503}
504
505/*
506 * Initialize dump globals for a given architecture
507 */
508static int __init sys_info_init(enum arch_id arch)
509{
510 switch (arch) {
511 case ARCH_S390X:
512 MSG("DETECTED 'S390X (64 bit) OS'\n");
513 sys_info.sa_base = SAVE_AREA_BASE_S390X;
514 sys_info.sa_size = sizeof(struct save_area_s390x);
515 set_s390x_lc_mask(&sys_info.lc_mask);
516 break;
517 case ARCH_S390:
518 MSG("DETECTED 'S390 (32 bit) OS'\n");
519 sys_info.sa_base = SAVE_AREA_BASE_S390;
520 sys_info.sa_size = sizeof(struct save_area_s390);
521 set_s390_lc_mask(&sys_info.lc_mask);
522 break;
523 default:
524 ERROR_MSG("unknown architecture 0x%x.\n",arch);
525 return -EINVAL;
526 }
527 sys_info.arch = arch;
528 if (init_cpu_info(arch)) {
529 ERROR_MSG("get cpu info failed\n");
530 return -ENOMEM;
531 }
532 sys_info.mem_size = real_memory_size;
533
534 return 0;
535}
536
537static int __init check_sdias(void)
538{
539 int rc, act_hsa_size;
540
541 rc = sclp_sdias_blk_count();
542 if (rc < 0) {
543 ERROR_MSG("Could not determine HSA size\n");
544 return rc;
545 }
546 act_hsa_size = (rc - 1) * PAGE_SIZE;
547 if (act_hsa_size < ZFCPDUMP_HSA_SIZE) {
548 ERROR_MSG("HSA size too small: %i\n", act_hsa_size);
549 return -EINVAL;
550 }
551 return 0;
552}
553
554static void __init zcore_header_init(int arch, struct zcore_header *hdr)
555{
556 if (arch == ARCH_S390X)
557 hdr->arch_id = DUMP_ARCH_S390X;
558 else
559 hdr->arch_id = DUMP_ARCH_S390;
560 hdr->mem_size = sys_info.mem_size;
561 hdr->mem_end = sys_info.mem_size;
562 hdr->num_pages = sys_info.mem_size / PAGE_SIZE;
563 hdr->tod = get_clock();
564 get_cpu_id(&hdr->cpu_id);
565}
566
567extern int sdias_init(void);
568
569static int __init zcore_init(void)
570{
571 unsigned char arch;
572 int rc;
573
574 if (ipl_info.type != IPL_TYPE_FCP_DUMP)
575 return -ENODATA;
576
577 zcore_dbf = debug_register("zcore", 4, 1, 4 * sizeof(long));
578 debug_register_view(zcore_dbf, &debug_sprintf_view);
579 debug_set_level(zcore_dbf, 6);
580
581 TRACE("devno: %x\n", ipl_info.data.fcp.dev_id.devno);
582 TRACE("wwpn: %llx\n", (unsigned long long) ipl_info.data.fcp.wwpn);
583 TRACE("lun: %llx\n", (unsigned long long) ipl_info.data.fcp.lun);
584
585 rc = sdias_init();
586 if (rc)
587 goto fail;
588
589 rc = check_sdias();
590 if (rc) {
591 ERROR_MSG("Dump initialization failed\n");
592 goto fail;
593 }
594
595 rc = memcpy_hsa_kernel(&arch, __LC_AR_MODE_ID, 1);
596 if (rc) {
597 ERROR_MSG("sdial memcpy for arch id failed\n");
598 goto fail;
599 }
600
601#ifndef __s390x__
602 if (arch == ARCH_S390X) {
603 ERROR_MSG("32 bit dumper can't dump 64 bit system!\n");
604 rc = -EINVAL;
605 goto fail;
606 }
607#endif
608
609 rc = sys_info_init(arch);
610 if (rc) {
611 ERROR_MSG("arch init failed\n");
612 goto fail;
613 }
614
615 zcore_header_init(arch, &zcore_header);
616
617 zcore_dir = debugfs_create_dir("zcore" , NULL);
618 if (!zcore_dir) {
619 rc = -ENOMEM;
620 goto fail;
621 }
622 zcore_file = debugfs_create_file("mem", S_IRUSR, zcore_dir, NULL,
623 &zcore_fops);
624 if (!zcore_file) {
625 debugfs_remove(zcore_dir);
626 rc = -ENOMEM;
627 goto fail;
628 }
629 hsa_available = 1;
630 return 0;
631
632fail:
633 diag308(DIAG308_REL_HSA, NULL);
634 return rc;
635}
636
637extern void sdias_exit(void);
638
639static void __exit zcore_exit(void)
640{
641 debug_unregister(zcore_dbf);
642 sdias_exit();
643 diag308(DIAG308_REL_HSA, NULL);
644}
645
646MODULE_AUTHOR("Copyright IBM Corp. 2003,2007");
647MODULE_DESCRIPTION("zcore module for zfcpdump support");
648MODULE_LICENSE("GPL");
649
650subsys_initcall(zcore_init);
651module_exit(zcore_exit);
generated by cgit v1.2.2 (git 2.25.0) at 2025-01-04 05:17:54 -0500