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-rw-r--r--drivers/s390/block/Kconfig14
-rw-r--r--drivers/s390/block/Makefile2
-rw-r--r--drivers/s390/block/dasd.c76
-rw-r--r--drivers/s390/block/dasd_3990_erp.c3
-rw-r--r--drivers/s390/block/dasd_eckd.h1
-rw-r--r--drivers/s390/block/dasd_eer.c1090
-rw-r--r--drivers/s390/block/dasd_int.h37
-rw-r--r--include/asm-s390/dasd.h13
8 files changed, 5 insertions, 1231 deletions
diff --git a/drivers/s390/block/Kconfig b/drivers/s390/block/Kconfig
index 6912399d0937..6f50cc9323d9 100644
--- a/drivers/s390/block/Kconfig
+++ b/drivers/s390/block/Kconfig
@@ -55,21 +55,13 @@ config DASD_DIAG
55 Disks under VM. If you are not running under VM or unsure what it is, 55 Disks under VM. If you are not running under VM or unsure what it is,
56 say "N". 56 say "N".
57 57
58config DASD_EER
59 tristate "Extended error reporting (EER)"
60 depends on DASD
61 help
62 This driver provides a character device interface to the
63 DASD extended error reporting. This is only needed if you want to
64 use applications written for the EER facility.
65
66config DASD_CMB 58config DASD_CMB
67 tristate "Compatibility interface for DASD channel measurement blocks" 59 tristate "Compatibility interface for DASD channel measurement blocks"
68 depends on DASD 60 depends on DASD
69 help 61 help
70 This driver provides an additional interface to the channel 62 This driver provides an additional interface to the channel measurement
71 measurement facility, which is normally accessed though sysfs, with 63 facility, which is normally accessed though sysfs, with a set of
72 a set of ioctl functions specific to the dasd driver. 64 ioctl functions specific to the dasd driver.
73 This is only needed if you want to use applications written for 65 This is only needed if you want to use applications written for
74 linux-2.4 dasd channel measurement facility interface. 66 linux-2.4 dasd channel measurement facility interface.
75 67
diff --git a/drivers/s390/block/Makefile b/drivers/s390/block/Makefile
index 0c0d871e8f51..58c6780134f7 100644
--- a/drivers/s390/block/Makefile
+++ b/drivers/s390/block/Makefile
@@ -5,7 +5,6 @@
5dasd_eckd_mod-objs := dasd_eckd.o dasd_3990_erp.o dasd_9343_erp.o 5dasd_eckd_mod-objs := dasd_eckd.o dasd_3990_erp.o dasd_9343_erp.o
6dasd_fba_mod-objs := dasd_fba.o dasd_3370_erp.o dasd_9336_erp.o 6dasd_fba_mod-objs := dasd_fba.o dasd_3370_erp.o dasd_9336_erp.o
7dasd_diag_mod-objs := dasd_diag.o 7dasd_diag_mod-objs := dasd_diag.o
8dasd_eer_mod-objs := dasd_eer.o
9dasd_mod-objs := dasd.o dasd_ioctl.o dasd_proc.o dasd_devmap.o \ 8dasd_mod-objs := dasd.o dasd_ioctl.o dasd_proc.o dasd_devmap.o \
10 dasd_genhd.o dasd_erp.o 9 dasd_genhd.o dasd_erp.o
11 10
@@ -14,6 +13,5 @@ obj-$(CONFIG_DASD_DIAG) += dasd_diag_mod.o
14obj-$(CONFIG_DASD_ECKD) += dasd_eckd_mod.o 13obj-$(CONFIG_DASD_ECKD) += dasd_eckd_mod.o
15obj-$(CONFIG_DASD_FBA) += dasd_fba_mod.o 14obj-$(CONFIG_DASD_FBA) += dasd_fba_mod.o
16obj-$(CONFIG_DASD_CMB) += dasd_cmb.o 15obj-$(CONFIG_DASD_CMB) += dasd_cmb.o
17obj-$(CONFIG_DASD_EER) += dasd_eer.o
18obj-$(CONFIG_BLK_DEV_XPRAM) += xpram.o 16obj-$(CONFIG_BLK_DEV_XPRAM) += xpram.o
19obj-$(CONFIG_DCSSBLK) += dcssblk.o 17obj-$(CONFIG_DCSSBLK) += dcssblk.o
diff --git a/drivers/s390/block/dasd.c b/drivers/s390/block/dasd.c
index 06bb992a4c6c..af1d5b404cee 100644
--- a/drivers/s390/block/dasd.c
+++ b/drivers/s390/block/dasd.c
@@ -18,7 +18,6 @@
18#include <linux/slab.h> 18#include <linux/slab.h>
19#include <linux/buffer_head.h> 19#include <linux/buffer_head.h>
20#include <linux/hdreg.h> 20#include <linux/hdreg.h>
21#include <linux/notifier.h>
22 21
23#include <asm/ccwdev.h> 22#include <asm/ccwdev.h>
24#include <asm/ebcdic.h> 23#include <asm/ebcdic.h>
@@ -58,7 +57,6 @@ static void dasd_int_handler(struct ccw_device *, unsigned long, struct irb *);
58static void dasd_flush_ccw_queue(struct dasd_device *, int); 57static void dasd_flush_ccw_queue(struct dasd_device *, int);
59static void dasd_tasklet(struct dasd_device *); 58static void dasd_tasklet(struct dasd_device *);
60static void do_kick_device(void *data); 59static void do_kick_device(void *data);
61static void dasd_disable_eer(struct dasd_device *device);
62 60
63/* 61/*
64 * SECTION: Operations on the device structure. 62 * SECTION: Operations on the device structure.
@@ -153,8 +151,6 @@ dasd_state_new_to_known(struct dasd_device *device)
153static inline void 151static inline void
154dasd_state_known_to_new(struct dasd_device * device) 152dasd_state_known_to_new(struct dasd_device * device)
155{ 153{
156 /* disable extended error reporting for this device */
157 dasd_disable_eer(device);
158 /* Forget the discipline information. */ 154 /* Forget the discipline information. */
159 if (device->discipline) 155 if (device->discipline)
160 module_put(device->discipline->owner); 156 module_put(device->discipline->owner);
@@ -876,9 +872,6 @@ dasd_handle_state_change_pending(struct dasd_device *device)
876 struct dasd_ccw_req *cqr; 872 struct dasd_ccw_req *cqr;
877 struct list_head *l, *n; 873 struct list_head *l, *n;
878 874
879 /* first of all call extended error reporting */
880 dasd_write_eer_trigger(DASD_EER_STATECHANGE, device, NULL);
881
882 device->stopped &= ~DASD_STOPPED_PENDING; 875 device->stopped &= ~DASD_STOPPED_PENDING;
883 876
884 /* restart all 'running' IO on queue */ 877 /* restart all 'running' IO on queue */
@@ -1098,19 +1091,6 @@ restart:
1098 } 1091 }
1099 goto restart; 1092 goto restart;
1100 } 1093 }
1101
1102 /* first of all call extended error reporting */
1103 if (device->eer && cqr->status == DASD_CQR_FAILED) {
1104 dasd_write_eer_trigger(DASD_EER_FATALERROR,
1105 device, cqr);
1106
1107 /* restart request */
1108 cqr->status = DASD_CQR_QUEUED;
1109 cqr->retries = 255;
1110 device->stopped |= DASD_STOPPED_QUIESCE;
1111 goto restart;
1112 }
1113
1114 /* Process finished ERP request. */ 1094 /* Process finished ERP request. */
1115 if (cqr->refers) { 1095 if (cqr->refers) {
1116 __dasd_process_erp(device, cqr); 1096 __dasd_process_erp(device, cqr);
@@ -1248,8 +1228,7 @@ __dasd_start_head(struct dasd_device * device)
1248 cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, list); 1228 cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, list);
1249 /* check FAILFAST */ 1229 /* check FAILFAST */
1250 if (device->stopped & ~DASD_STOPPED_PENDING && 1230 if (device->stopped & ~DASD_STOPPED_PENDING &&
1251 test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags) && 1231 test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags)) {
1252 (!device->eer)) {
1253 cqr->status = DASD_CQR_FAILED; 1232 cqr->status = DASD_CQR_FAILED;
1254 dasd_schedule_bh(device); 1233 dasd_schedule_bh(device);
1255 } 1234 }
@@ -2005,9 +1984,6 @@ dasd_generic_notify(struct ccw_device *cdev, int event)
2005 switch (event) { 1984 switch (event) {
2006 case CIO_GONE: 1985 case CIO_GONE:
2007 case CIO_NO_PATH: 1986 case CIO_NO_PATH:
2008 /* first of all call extended error reporting */
2009 dasd_write_eer_trigger(DASD_EER_NOPATH, device, NULL);
2010
2011 if (device->state < DASD_STATE_BASIC) 1987 if (device->state < DASD_STATE_BASIC)
2012 break; 1988 break;
2013 /* Device is active. We want to keep it. */ 1989 /* Device is active. We want to keep it. */
@@ -2065,51 +2041,6 @@ dasd_generic_auto_online (struct ccw_driver *dasd_discipline_driver)
2065 put_driver(drv); 2041 put_driver(drv);
2066} 2042}
2067 2043
2068/*
2069 * notifications for extended error reports
2070 */
2071static struct notifier_block *dasd_eer_chain;
2072
2073int
2074dasd_register_eer_notifier(struct notifier_block *nb)
2075{
2076 return notifier_chain_register(&dasd_eer_chain, nb);
2077}
2078
2079int
2080dasd_unregister_eer_notifier(struct notifier_block *nb)
2081{
2082 return notifier_chain_unregister(&dasd_eer_chain, nb);
2083}
2084
2085/*
2086 * Notify the registered error reporting module of a problem
2087 */
2088void
2089dasd_write_eer_trigger(unsigned int id, struct dasd_device *device,
2090 struct dasd_ccw_req *cqr)
2091{
2092 if (device->eer) {
2093 struct dasd_eer_trigger temp;
2094 temp.id = id;
2095 temp.device = device;
2096 temp.cqr = cqr;
2097 notifier_call_chain(&dasd_eer_chain, DASD_EER_TRIGGER,
2098 (void *)&temp);
2099 }
2100}
2101
2102/*
2103 * Tell the registered error reporting module to disable error reporting for
2104 * a given device and to cleanup any private data structures on that device.
2105 */
2106static void
2107dasd_disable_eer(struct dasd_device *device)
2108{
2109 notifier_call_chain(&dasd_eer_chain, DASD_EER_DISABLE, (void *)device);
2110}
2111
2112
2113static int __init 2044static int __init
2114dasd_init(void) 2045dasd_init(void)
2115{ 2046{
@@ -2191,11 +2122,6 @@ EXPORT_SYMBOL_GPL(dasd_generic_set_online);
2191EXPORT_SYMBOL_GPL(dasd_generic_set_offline); 2122EXPORT_SYMBOL_GPL(dasd_generic_set_offline);
2192EXPORT_SYMBOL_GPL(dasd_generic_auto_online); 2123EXPORT_SYMBOL_GPL(dasd_generic_auto_online);
2193 2124
2194EXPORT_SYMBOL(dasd_register_eer_notifier);
2195EXPORT_SYMBOL(dasd_unregister_eer_notifier);
2196EXPORT_SYMBOL(dasd_write_eer_trigger);
2197
2198
2199/* 2125/*
2200 * Overrides for Emacs so that we follow Linus's tabbing style. 2126 * Overrides for Emacs so that we follow Linus's tabbing style.
2201 * Emacs will notice this stuff at the end of the file and automatically 2127 * Emacs will notice this stuff at the end of the file and automatically
diff --git a/drivers/s390/block/dasd_3990_erp.c b/drivers/s390/block/dasd_3990_erp.c
index c811380b9079..4ee0f934e325 100644
--- a/drivers/s390/block/dasd_3990_erp.c
+++ b/drivers/s390/block/dasd_3990_erp.c
@@ -1108,9 +1108,6 @@ dasd_3990_handle_env_data(struct dasd_ccw_req * erp, char *sense)
1108 case 0x0B: 1108 case 0x0B:
1109 DEV_MESSAGE(KERN_WARNING, device, "%s", 1109 DEV_MESSAGE(KERN_WARNING, device, "%s",
1110 "FORMAT F - Volume is suspended duplex"); 1110 "FORMAT F - Volume is suspended duplex");
1111 /* call extended error reporting (EER) */
1112 dasd_write_eer_trigger(DASD_EER_PPRCSUSPEND, device,
1113 erp->refers);
1114 break; 1111 break;
1115 case 0x0C: 1112 case 0x0C:
1116 DEV_MESSAGE(KERN_WARNING, device, "%s", 1113 DEV_MESSAGE(KERN_WARNING, device, "%s",
diff --git a/drivers/s390/block/dasd_eckd.h b/drivers/s390/block/dasd_eckd.h
index e15dd7978050..bc3823d35223 100644
--- a/drivers/s390/block/dasd_eckd.h
+++ b/drivers/s390/block/dasd_eckd.h
@@ -29,7 +29,6 @@
29#define DASD_ECKD_CCW_PSF 0x27 29#define DASD_ECKD_CCW_PSF 0x27
30#define DASD_ECKD_CCW_RSSD 0x3e 30#define DASD_ECKD_CCW_RSSD 0x3e
31#define DASD_ECKD_CCW_LOCATE_RECORD 0x47 31#define DASD_ECKD_CCW_LOCATE_RECORD 0x47
32#define DASD_ECKD_CCW_SNSS 0x54
33#define DASD_ECKD_CCW_DEFINE_EXTENT 0x63 32#define DASD_ECKD_CCW_DEFINE_EXTENT 0x63
34#define DASD_ECKD_CCW_WRITE_MT 0x85 33#define DASD_ECKD_CCW_WRITE_MT 0x85
35#define DASD_ECKD_CCW_READ_MT 0x86 34#define DASD_ECKD_CCW_READ_MT 0x86
diff --git a/drivers/s390/block/dasd_eer.c b/drivers/s390/block/dasd_eer.c
deleted file mode 100644
index f70cd7716b24..000000000000
--- a/drivers/s390/block/dasd_eer.c
+++ /dev/null
@@ -1,1090 +0,0 @@
1/*
2 * character device driver for extended error reporting
3 *
4 *
5 * Copyright (C) 2005 IBM Corporation
6 * extended error reporting for DASD ECKD devices
7 * Author(s): Stefan Weinhuber <wein@de.ibm.com>
8 *
9 */
10
11#include <linux/init.h>
12#include <linux/fs.h>
13#include <linux/kernel.h>
14#include <linux/miscdevice.h>
15#include <linux/module.h>
16#include <linux/moduleparam.h>
17#include <linux/device.h>
18#include <linux/workqueue.h>
19#include <linux/poll.h>
20#include <linux/notifier.h>
21
22#include <asm/uaccess.h>
23#include <asm/semaphore.h>
24#include <asm/atomic.h>
25#include <asm/ebcdic.h>
26
27#include "dasd_int.h"
28#include "dasd_eckd.h"
29
30
31MODULE_LICENSE("GPL");
32
33MODULE_AUTHOR("Stefan Weinhuber <wein@de.ibm.com>");
34MODULE_DESCRIPTION("DASD extended error reporting module");
35
36
37#ifdef PRINTK_HEADER
38#undef PRINTK_HEADER
39#endif /* PRINTK_HEADER */
40#define PRINTK_HEADER "dasd(eer):"
41
42
43
44
45
46/*****************************************************************************/
47/* the internal buffer */
48/*****************************************************************************/
49
50/*
51 * The internal buffer is meant to store obaque blobs of data, so it doesn't
52 * know of higher level concepts like triggers.
53 * It consists of a number of pages that are used as a ringbuffer. Each data
54 * blob is stored in a simple record that consists of an integer, which
55 * contains the size of the following data, and the data bytes themselfes.
56 *
57 * To allow for multiple independent readers we create one internal buffer
58 * each time the device is opened and destroy the buffer when the file is
59 * closed again.
60 *
61 * One record can be written to a buffer by using the functions
62 * - dasd_eer_start_record (one time per record to write the size to the buffer
63 * and reserve the space for the data)
64 * - dasd_eer_write_buffer (one or more times per record to write the data)
65 * The data can be written in several steps but you will have to compute
66 * the total size up front for the invocation of dasd_eer_start_record.
67 * If the ringbuffer is full, dasd_eer_start_record will remove the required
68 * number of old records.
69 *
70 * A record is typically read in two steps, first read the integer that
71 * specifies the size of the following data, then read the data.
72 * Both can be done by
73 * - dasd_eer_read_buffer
74 *
75 * For all mentioned functions you need to get the bufferlock first and keep it
76 * until a complete record is written or read.
77 */
78
79
80/*
81 * Alle information necessary to keep track of an internal buffer is kept in
82 * a struct eerbuffer. The buffer specific to a file pointer is strored in
83 * the private_data field of that file. To be able to write data to all
84 * existing buffers, each buffer is also added to the bufferlist.
85 * If the user doesn't want to read a complete record in one go, we have to
86 * keep track of the rest of the record. residual stores the number of bytes
87 * that are still to deliver. If the rest of the record is invalidated between
88 * two reads then residual will be set to -1 so that the next read will fail.
89 * All entries in the eerbuffer structure are protected with the bufferlock.
90 * To avoid races between writing to a buffer on the one side and creating
91 * and destroying buffers on the other side, the bufferlock must also be used
92 * to protect the bufferlist.
93 */
94
95struct eerbuffer {
96 struct list_head list;
97 char **buffer;
98 int buffersize;
99 int buffer_page_count;
100 int head;
101 int tail;
102 int residual;
103};
104
105LIST_HEAD(bufferlist);
106
107static spinlock_t bufferlock = SPIN_LOCK_UNLOCKED;
108
109DECLARE_WAIT_QUEUE_HEAD(dasd_eer_read_wait_queue);
110
111/*
112 * How many free bytes are available on the buffer.
113 * needs to be called with bufferlock held
114 */
115static int
116dasd_eer_get_free_bytes(struct eerbuffer *eerb)
117{
118 if (eerb->head < eerb->tail) {
119 return eerb->tail - eerb->head - 1;
120 } else
121 return eerb->buffersize - eerb->head + eerb->tail -1;
122}
123
124/*
125 * How many bytes of buffer space are used.
126 * needs to be called with bufferlock held
127 */
128static int
129dasd_eer_get_filled_bytes(struct eerbuffer *eerb)
130{
131
132 if (eerb->head >= eerb->tail) {
133 return eerb->head - eerb->tail;
134 } else
135 return eerb->buffersize - eerb->tail + eerb->head;
136}
137
138/*
139 * The dasd_eer_write_buffer function just copies count bytes of data
140 * to the buffer. Make sure to call dasd_eer_start_record first, to
141 * make sure that enough free space is available.
142 * needs to be called with bufferlock held
143 */
144static void
145dasd_eer_write_buffer(struct eerbuffer *eerb, int count, char *data)
146{
147
148 unsigned long headindex,localhead;
149 unsigned long rest, len;
150 char *nextdata;
151
152 nextdata = data;
153 rest = count;
154 while (rest > 0) {
155 headindex = eerb->head / PAGE_SIZE;
156 localhead = eerb->head % PAGE_SIZE;
157 len = min(rest, (PAGE_SIZE - localhead));
158 memcpy(eerb->buffer[headindex]+localhead, nextdata, len);
159 nextdata += len;
160 rest -= len;
161 eerb->head += len;
162 if ( eerb->head == eerb->buffersize )
163 eerb->head = 0; /* wrap around */
164 if (eerb->head > eerb->buffersize) {
165 MESSAGE(KERN_ERR, "%s", "runaway buffer head.");
166 BUG();
167 }
168 }
169}
170
171/*
172 * needs to be called with bufferlock held
173 */
174static int
175dasd_eer_read_buffer(struct eerbuffer *eerb, int count, char *data)
176{
177
178 unsigned long tailindex,localtail;
179 unsigned long rest, len, finalcount;
180 char *nextdata;
181
182 finalcount = min(count, dasd_eer_get_filled_bytes(eerb));
183 nextdata = data;
184 rest = finalcount;
185 while (rest > 0) {
186 tailindex = eerb->tail / PAGE_SIZE;
187 localtail = eerb->tail % PAGE_SIZE;
188 len = min(rest, (PAGE_SIZE - localtail));
189 memcpy(nextdata, eerb->buffer[tailindex]+localtail, len);
190 nextdata += len;
191 rest -= len;
192 eerb->tail += len;
193 if ( eerb->tail == eerb->buffersize )
194 eerb->tail = 0; /* wrap around */
195 if (eerb->tail > eerb->buffersize) {
196 MESSAGE(KERN_ERR, "%s", "runaway buffer tail.");
197 BUG();
198 }
199 }
200 return finalcount;
201}
202
203/*
204 * Whenever you want to write a blob of data to the internal buffer you
205 * have to start by using this function first. It will write the number
206 * of bytes that will be written to the buffer. If necessary it will remove
207 * old records to make room for the new one.
208 * needs to be called with bufferlock held
209 */
210static int
211dasd_eer_start_record(struct eerbuffer *eerb, int count)
212{
213 int tailcount;
214 if (count + sizeof(count) > eerb->buffersize)
215 return -ENOMEM;
216 while (dasd_eer_get_free_bytes(eerb) < count + sizeof(count)) {
217 if (eerb->residual > 0) {
218 eerb->tail += eerb->residual;
219 if (eerb->tail >= eerb->buffersize)
220 eerb->tail -= eerb->buffersize;
221 eerb->residual = -1;
222 }
223 dasd_eer_read_buffer(eerb, sizeof(tailcount),
224 (char*)(&tailcount));
225 eerb->tail += tailcount;
226 if (eerb->tail >= eerb->buffersize)
227 eerb->tail -= eerb->buffersize;
228 }
229 dasd_eer_write_buffer(eerb, sizeof(count), (char*)(&count));
230
231 return 0;
232};
233
234/*
235 * release pages that are not used anymore
236 */
237static void
238dasd_eer_free_buffer_pages(char **buf, int no_pages)
239{
240 int i;
241
242 for (i = 0; i < no_pages; ++i) {
243 free_page((unsigned long)buf[i]);
244 }
245}
246
247/*
248 * allocate a new set of memory pages
249 */
250static int
251dasd_eer_allocate_buffer_pages(char **buf, int no_pages)
252{
253 int i;
254
255 for (i = 0; i < no_pages; ++i) {
256 buf[i] = (char *) get_zeroed_page(GFP_KERNEL);
257 if (!buf[i]) {
258 dasd_eer_free_buffer_pages(buf, i);
259 return -ENOMEM;
260 }
261 }
262 return 0;
263}
264
265/*
266 * empty the buffer by resetting head and tail
267 * In case there is a half read data blob in the buffer, we set residual
268 * to -1 to indicate that the remainder of the blob is lost.
269 */
270static void
271dasd_eer_purge_buffer(struct eerbuffer *eerb)
272{
273 unsigned long flags;
274
275 spin_lock_irqsave(&bufferlock, flags);
276 if (eerb->residual > 0)
277 eerb->residual = -1;
278 eerb->tail=0;
279 eerb->head=0;
280 spin_unlock_irqrestore(&bufferlock, flags);
281}
282
283/*
284 * set the size of the buffer, newsize is the new number of pages to be used
285 * we don't try to copy any data back an forth, so any resize will also purge
286 * the buffer
287 */
288static int
289dasd_eer_resize_buffer(struct eerbuffer *eerb, int newsize)
290{
291 int i, oldcount, reuse;
292 char **new;
293 char **old;
294 unsigned long flags;
295
296 if (newsize < 1)
297 return -EINVAL;
298 if (eerb->buffer_page_count == newsize) {
299 /* documented behaviour is that any successfull invocation
300 * will purge all records */
301 dasd_eer_purge_buffer(eerb);
302 return 0;
303 }
304 new = kmalloc(newsize*sizeof(char*), GFP_KERNEL);
305 if (!new)
306 return -ENOMEM;
307
308 reuse=min(eerb->buffer_page_count, newsize);
309 for (i = 0; i < reuse; ++i) {
310 new[i] = eerb->buffer[i];
311 }
312 if (eerb->buffer_page_count < newsize) {
313 if (dasd_eer_allocate_buffer_pages(
314 &new[eerb->buffer_page_count],
315 newsize - eerb->buffer_page_count)) {
316 kfree(new);
317 return -ENOMEM;
318 }
319 }
320
321 spin_lock_irqsave(&bufferlock, flags);
322 old = eerb->buffer;
323 eerb->buffer = new;
324 if (eerb->residual > 0)
325 eerb->residual = -1;
326 eerb->tail = 0;
327 eerb->head = 0;
328 oldcount = eerb->buffer_page_count;
329 eerb->buffer_page_count = newsize;
330 spin_unlock_irqrestore(&bufferlock, flags);
331
332 if (oldcount > newsize) {
333 for (i = newsize; i < oldcount; ++i) {
334 free_page((unsigned long)old[i]);
335 }
336 }
337 kfree(old);
338
339 return 0;
340}
341
342
343/*****************************************************************************/
344/* The extended error reporting functionality */
345/*****************************************************************************/
346
347/*
348 * When a DASD device driver wants to report an error, it calls the
349 * function dasd_eer_write_trigger (via a notifier mechanism) and gives the
350 * respective trigger ID as parameter.
351 * Currently there are four kinds of triggers:
352 *
353 * DASD_EER_FATALERROR: all kinds of unrecoverable I/O problems
354 * DASD_EER_PPRCSUSPEND: PPRC was suspended
355 * DASD_EER_NOPATH: There is no path to the device left.
356 * DASD_EER_STATECHANGE: The state of the device has changed.
357 *
358 * For the first three triggers all required information can be supplied by
359 * the caller. For these triggers a record is written by the function
360 * dasd_eer_write_standard_trigger.
361 *
362 * When dasd_eer_write_trigger is called to write a DASD_EER_STATECHANGE
363 * trigger, we have to gather the necessary sense data first. We cannot queue
364 * the necessary SNSS (sense subsystem status) request immediatly, since we
365 * are likely to run in a deadlock situation. Instead, we schedule a
366 * work_struct that calls the function dasd_eer_sense_subsystem_status to
367 * create and start an SNSS request asynchronously.
368 *
369 * To avoid memory allocations at runtime, the necessary memory is allocated
370 * when the extended error reporting is enabled for a device (by
371 * dasd_eer_probe). There is one private eer data structure for each eer
372 * enabled DASD device. It contains memory for the work_struct, one SNSS cqr
373 * and a flags field that is used to coordinate the use of the cqr. The call
374 * to write a state change trigger can come in at any time, so we have one flag
375 * CQR_IN_USE that protects the cqr itself. When this flag indicates that the
376 * cqr is currently in use, dasd_eer_sense_subsystem_status cannot start a
377 * second request but sets the SNSS_REQUESTED flag instead.
378 *
379 * When the request is finished, the callback function dasd_eer_SNSS_cb
380 * is called. This function will invoke the function
381 * dasd_eer_write_SNSS_trigger to finally write the trigger. It will also
382 * check the SNSS_REQUESTED flag and if it is set it will call
383 * dasd_eer_sense_subsystem_status again.
384 *
385 * To avoid race conditions during the handling of the lock, the flags must
386 * be protected by the snsslock.
387 */
388
389struct dasd_eer_private {
390 struct dasd_ccw_req *cqr;
391 unsigned long flags;
392 struct work_struct worker;
393};
394
395static void dasd_eer_destroy(struct dasd_device *device,
396 struct dasd_eer_private *eer);
397static int
398dasd_eer_write_trigger(struct dasd_eer_trigger *trigger);
399static void dasd_eer_sense_subsystem_status(void *data);
400static int dasd_eer_notify(struct notifier_block *self,
401 unsigned long action, void *data);
402
403struct workqueue_struct *dasd_eer_workqueue;
404
405#define SNSS_DATA_SIZE 44
406static spinlock_t snsslock = SPIN_LOCK_UNLOCKED;
407
408#define DASD_EER_BUSID_SIZE 10
409struct dasd_eer_header {
410 __u32 total_size;
411 __u32 trigger;
412 __u64 tv_sec;
413 __u64 tv_usec;
414 char busid[DASD_EER_BUSID_SIZE];
415} __attribute__ ((packed));
416
417static struct notifier_block dasd_eer_nb = {
418 .notifier_call = dasd_eer_notify,
419};
420
421/*
422 * flags for use with dasd_eer_private
423 */
424#define CQR_IN_USE 0
425#define SNSS_REQUESTED 1
426
427/*
428 * This function checks if extended error reporting is available for a given
429 * dasd_device. If yes, then it creates and returns a struct dasd_eer,
430 * otherwise it returns an -EPERM error pointer.
431 */
432struct dasd_eer_private *
433dasd_eer_probe(struct dasd_device *device)
434{
435 struct dasd_eer_private *private;
436
437 if (!(device && device->discipline
438 && !strcmp(device->discipline->name, "ECKD"))) {
439 return ERR_PTR(-EPERM);
440 }
441 /* allocate the private data structure */
442 private = (struct dasd_eer_private *)kmalloc(
443 sizeof(struct dasd_eer_private), GFP_KERNEL);
444 if (!private) {
445 return ERR_PTR(-ENOMEM);
446 }
447 INIT_WORK(&private->worker, dasd_eer_sense_subsystem_status,
448 (void *)device);
449 private->cqr = dasd_kmalloc_request("ECKD",
450 1 /* SNSS */ ,
451 SNSS_DATA_SIZE ,
452 device);
453 if (!private->cqr) {
454 kfree(private);
455 return ERR_PTR(-ENOMEM);
456 }
457 private->flags = 0;
458 return private;
459};
460
461/*
462 * If our private SNSS request is queued, remove it from the
463 * dasd ccw queue so we can free the requests memory.
464 */
465static void
466dasd_eer_dequeue_SNSS_request(struct dasd_device *device,
467 struct dasd_eer_private *eer)
468{
469 struct list_head *lst, *nxt;
470 struct dasd_ccw_req *cqr, *erpcqr;
471 dasd_erp_fn_t erp_fn;
472
473 spin_lock_irq(get_ccwdev_lock(device->cdev));
474 list_for_each_safe(lst, nxt, &device->ccw_queue) {
475 cqr = list_entry(lst, struct dasd_ccw_req, list);
476 /* we are looking for two kinds or requests */
477 /* first kind: our SNSS request: */
478 if (cqr == eer->cqr) {
479 if (cqr->status == DASD_CQR_IN_IO)
480 device->discipline->term_IO(cqr);
481 list_del(&cqr->list);
482 break;
483 }
484 /* second kind: ERP requests for our SNSS request */
485 if (cqr->refers) {
486 /* If this erp request chain ends in our cqr, then */
487 /* cal the erp_postaction to clean it up */
488 erpcqr = cqr;
489 while (erpcqr->refers) {
490 erpcqr = erpcqr->refers;
491 }
492 if (erpcqr == eer->cqr) {
493 erp_fn = device->discipline->erp_postaction(
494 cqr);
495 erp_fn(cqr);
496 }
497 continue;
498 }
499 }
500 spin_unlock_irq(get_ccwdev_lock(device->cdev));
501}
502
503/*
504 * This function dismantles a struct dasd_eer that was created by
505 * dasd_eer_probe. Since we want to free our private data structure,
506 * we must make sure that the memory is not in use anymore.
507 * We have to flush the work queue and remove a possible SNSS request
508 * from the dasd queue.
509 */
510static void
511dasd_eer_destroy(struct dasd_device *device, struct dasd_eer_private *eer)
512{
513 flush_workqueue(dasd_eer_workqueue);
514 dasd_eer_dequeue_SNSS_request(device, eer);
515 dasd_kfree_request(eer->cqr, device);
516 kfree(eer);
517};
518
519/*
520 * enable the extended error reporting for a particular device
521 */
522static int
523dasd_eer_enable_on_device(struct dasd_device *device)
524{
525 void *eer;
526 if (!device)
527 return -ENODEV;
528 if (device->eer)
529 return 0;
530 if (!try_module_get(THIS_MODULE)) {
531 return -EINVAL;
532 }
533 eer = (void *)dasd_eer_probe(device);
534 if (IS_ERR(eer)) {
535 module_put(THIS_MODULE);
536 return PTR_ERR(eer);
537 }
538 device->eer = eer;
539 return 0;
540}
541
542/*
543 * enable the extended error reporting for a particular device
544 */
545static int
546dasd_eer_disable_on_device(struct dasd_device *device)
547{
548 struct dasd_eer_private *eer = device->eer;
549
550 if (!device)
551 return -ENODEV;
552 if (!device->eer)
553 return 0;
554 device->eer = NULL;
555 dasd_eer_destroy(device,eer);
556 module_put(THIS_MODULE);
557
558 return 0;
559}
560
561/*
562 * Set extended error reporting (eer)
563 * Note: This will be registered as a DASD ioctl, to be called on DASD devices.
564 */
565static int
566dasd_ioctl_set_eer(struct block_device *bdev, int no, long args)
567{
568 struct dasd_device *device;
569 int intval;
570
571 if (!capable(CAP_SYS_ADMIN))
572 return -EACCES;
573 if (bdev != bdev->bd_contains)
574 /* Error-reporting is not allowed for partitions */
575 return -EINVAL;
576 if (get_user(intval, (int __user *) args))
577 return -EFAULT;
578 device = bdev->bd_disk->private_data;
579 if (device == NULL)
580 return -ENODEV;
581
582 intval = (intval != 0);
583 DEV_MESSAGE (KERN_DEBUG, device,
584 "set eer on device to %d", intval);
585 if (intval)
586 return dasd_eer_enable_on_device(device);
587 else
588 return dasd_eer_disable_on_device(device);
589}
590
591/*
592 * Get value of extended error reporting.
593 * Note: This will be registered as a DASD ioctl, to be called on DASD devices.
594 */
595static int
596dasd_ioctl_get_eer(struct block_device *bdev, int no, long args)
597{
598 struct dasd_device *device;
599
600 device = bdev->bd_disk->private_data;
601 if (device == NULL)
602 return -ENODEV;
603 return put_user((device->eer != NULL), (int __user *) args);
604}
605
606/*
607 * The following function can be used for those triggers that have
608 * all necessary data available when the function is called.
609 * If the parameter cqr is not NULL, the chain of requests will be searched
610 * for valid sense data, and all valid sense data sets will be added to
611 * the triggers data.
612 */
613static int
614dasd_eer_write_standard_trigger(int trigger, struct dasd_device *device,
615 struct dasd_ccw_req *cqr)
616{
617 struct dasd_ccw_req *temp_cqr;
618 int data_size;
619 struct timeval tv;
620 struct dasd_eer_header header;
621 unsigned long flags;
622 struct eerbuffer *eerb;
623
624 /* go through cqr chain and count the valid sense data sets */
625 temp_cqr = cqr;
626 data_size = 0;
627 while (temp_cqr) {
628 if (temp_cqr->irb.esw.esw0.erw.cons)
629 data_size += 32;
630 temp_cqr = temp_cqr->refers;
631 }
632
633 header.total_size = sizeof(header) + data_size + 4; /* "EOR" */
634 header.trigger = trigger;
635 do_gettimeofday(&tv);
636 header.tv_sec = tv.tv_sec;
637 header.tv_usec = tv.tv_usec;
638 strncpy(header.busid, device->cdev->dev.bus_id, DASD_EER_BUSID_SIZE);
639
640 spin_lock_irqsave(&bufferlock, flags);
641 list_for_each_entry(eerb, &bufferlist, list) {
642 dasd_eer_start_record(eerb, header.total_size);
643 dasd_eer_write_buffer(eerb, sizeof(header), (char*)(&header));
644 temp_cqr = cqr;
645 while (temp_cqr) {
646 if (temp_cqr->irb.esw.esw0.erw.cons)
647 dasd_eer_write_buffer(eerb, 32, cqr->irb.ecw);
648 temp_cqr = temp_cqr->refers;
649 }
650 dasd_eer_write_buffer(eerb, 4,"EOR");
651 }
652 spin_unlock_irqrestore(&bufferlock, flags);
653
654 wake_up_interruptible(&dasd_eer_read_wait_queue);
655
656 return 0;
657}
658
659/*
660 * This function writes a DASD_EER_STATECHANGE trigger.
661 */
662static void
663dasd_eer_write_SNSS_trigger(struct dasd_device *device,
664 struct dasd_ccw_req *cqr)
665{
666 int data_size;
667 int snss_rc;
668 struct timeval tv;
669 struct dasd_eer_header header;
670 unsigned long flags;
671 struct eerbuffer *eerb;
672
673 snss_rc = (cqr->status == DASD_CQR_FAILED) ? -EIO : 0;
674 if (snss_rc)
675 data_size = 0;
676 else
677 data_size = SNSS_DATA_SIZE;
678
679 header.total_size = sizeof(header) + data_size + 4; /* "EOR" */
680 header.trigger = DASD_EER_STATECHANGE;
681 do_gettimeofday(&tv);
682 header.tv_sec = tv.tv_sec;
683 header.tv_usec = tv.tv_usec;
684 strncpy(header.busid, device->cdev->dev.bus_id, DASD_EER_BUSID_SIZE);
685
686 spin_lock_irqsave(&bufferlock, flags);
687 list_for_each_entry(eerb, &bufferlist, list) {
688 dasd_eer_start_record(eerb, header.total_size);
689 dasd_eer_write_buffer(eerb, sizeof(header),(char*)(&header));
690 if (!snss_rc)
691 dasd_eer_write_buffer(eerb, SNSS_DATA_SIZE, cqr->data);
692 dasd_eer_write_buffer(eerb, 4,"EOR");
693 }
694 spin_unlock_irqrestore(&bufferlock, flags);
695
696 wake_up_interruptible(&dasd_eer_read_wait_queue);
697}
698
699/*
700 * callback function for use with SNSS request
701 */
702static void
703dasd_eer_SNSS_cb(struct dasd_ccw_req *cqr, void *data)
704{
705 struct dasd_device *device;
706 struct dasd_eer_private *private;
707 unsigned long irqflags;
708
709 device = (struct dasd_device *)data;
710 private = (struct dasd_eer_private *)device->eer;
711 dasd_eer_write_SNSS_trigger(device, cqr);
712 spin_lock_irqsave(&snsslock, irqflags);
713 if(!test_and_clear_bit(SNSS_REQUESTED, &private->flags)) {
714 clear_bit(CQR_IN_USE, &private->flags);
715 spin_unlock_irqrestore(&snsslock, irqflags);
716 return;
717 };
718 clear_bit(CQR_IN_USE, &private->flags);
719 spin_unlock_irqrestore(&snsslock, irqflags);
720 dasd_eer_sense_subsystem_status(device);
721 return;
722}
723
724/*
725 * clean a used cqr before using it again
726 */
727static void
728dasd_eer_clean_SNSS_request(struct dasd_ccw_req *cqr)
729{
730 struct ccw1 *cpaddr = cqr->cpaddr;
731 void *data = cqr->data;
732
733 memset(cqr, 0, sizeof(struct dasd_ccw_req));
734 memset(cpaddr, 0, sizeof(struct ccw1));
735 memset(data, 0, SNSS_DATA_SIZE);
736 cqr->cpaddr = cpaddr;
737 cqr->data = data;
738 strncpy((char *) &cqr->magic, "ECKD", 4);
739 ASCEBC((char *) &cqr->magic, 4);
740 set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
741}
742
743/*
744 * build and start an SNSS request
745 * This function is called from a work queue so we have to
746 * pass the dasd_device pointer as a void pointer.
747 */
748static void
749dasd_eer_sense_subsystem_status(void *data)
750{
751 struct dasd_device *device;
752 struct dasd_eer_private *private;
753 struct dasd_ccw_req *cqr;
754 struct ccw1 *ccw;
755 unsigned long irqflags;
756
757 device = (struct dasd_device *)data;
758 private = (struct dasd_eer_private *)device->eer;
759 if (!private) /* device not eer enabled any more */
760 return;
761 cqr = private->cqr;
762 spin_lock_irqsave(&snsslock, irqflags);
763 if(test_and_set_bit(CQR_IN_USE, &private->flags)) {
764 set_bit(SNSS_REQUESTED, &private->flags);
765 spin_unlock_irqrestore(&snsslock, irqflags);
766 return;
767 };
768 spin_unlock_irqrestore(&snsslock, irqflags);
769 dasd_eer_clean_SNSS_request(cqr);
770 cqr->device = device;
771 cqr->retries = 255;
772 cqr->expires = 10 * HZ;
773
774 ccw = cqr->cpaddr;
775 ccw->cmd_code = DASD_ECKD_CCW_SNSS;
776 ccw->count = SNSS_DATA_SIZE;
777 ccw->flags = 0;
778 ccw->cda = (__u32)(addr_t)cqr->data;
779
780 cqr->buildclk = get_clock();
781 cqr->status = DASD_CQR_FILLED;
782 cqr->callback = dasd_eer_SNSS_cb;
783 cqr->callback_data = (void *)device;
784 dasd_add_request_head(cqr);
785
786 return;
787}
788
789/*
790 * This function is called for all triggers. It calls the appropriate
791 * function that writes the actual trigger records.
792 */
793static int
794dasd_eer_write_trigger(struct dasd_eer_trigger *trigger)
795{
796 int rc;
797 struct dasd_eer_private *private = trigger->device->eer;
798
799 switch (trigger->id) {
800 case DASD_EER_FATALERROR:
801 case DASD_EER_PPRCSUSPEND:
802 rc = dasd_eer_write_standard_trigger(
803 trigger->id, trigger->device, trigger->cqr);
804 break;
805 case DASD_EER_NOPATH:
806 rc = dasd_eer_write_standard_trigger(
807 trigger->id, trigger->device, NULL);
808 break;
809 case DASD_EER_STATECHANGE:
810 if (queue_work(dasd_eer_workqueue, &private->worker)) {
811 rc=0;
812 } else {
813 /* If the work_struct was already queued, it can't
814 * be queued again. But this is OK since we don't
815 * need to have it queued twice.
816 */
817 rc = -EBUSY;
818 }
819 break;
820 default: /* unknown trigger, so we write it without any sense data */
821 rc = dasd_eer_write_standard_trigger(
822 trigger->id, trigger->device, NULL);
823 break;
824 }
825 return rc;
826}
827
828/*
829 * This function is registered with the dasd device driver and gets called
830 * for all dasd eer notifications.
831 */
832static int dasd_eer_notify(struct notifier_block *self,
833 unsigned long action, void *data)
834{
835 switch (action) {
836 case DASD_EER_DISABLE:
837 dasd_eer_disable_on_device((struct dasd_device *)data);
838 break;
839 case DASD_EER_TRIGGER:
840 dasd_eer_write_trigger((struct dasd_eer_trigger *)data);
841 break;
842 }
843 return NOTIFY_OK;
844}
845
846
847/*****************************************************************************/
848/* the device operations */
849/*****************************************************************************/
850
851/*
852 * On the one side we need a lock to access our internal buffer, on the
853 * other side a copy_to_user can sleep. So we need to copy the data we have
854 * to transfer in a readbuffer, which is protected by the readbuffer_mutex.
855 */
856static char readbuffer[PAGE_SIZE];
857DECLARE_MUTEX(readbuffer_mutex);
858
859
860static int
861dasd_eer_open(struct inode *inp, struct file *filp)
862{
863 struct eerbuffer *eerb;
864 unsigned long flags;
865
866 eerb = kmalloc(sizeof(struct eerbuffer), GFP_KERNEL);
867 eerb->head = 0;
868 eerb->tail = 0;
869 eerb->residual = 0;
870 eerb->buffer_page_count = 1;
871 eerb->buffersize = eerb->buffer_page_count * PAGE_SIZE;
872 eerb->buffer = kmalloc(eerb->buffer_page_count*sizeof(char*),
873 GFP_KERNEL);
874 if (!eerb->buffer)
875 return -ENOMEM;
876 if (dasd_eer_allocate_buffer_pages(eerb->buffer,
877 eerb->buffer_page_count)) {
878 kfree(eerb->buffer);
879 return -ENOMEM;
880 }
881 filp->private_data = eerb;
882 spin_lock_irqsave(&bufferlock, flags);
883 list_add(&eerb->list, &bufferlist);
884 spin_unlock_irqrestore(&bufferlock, flags);
885
886 return nonseekable_open(inp,filp);
887}
888
889static int
890dasd_eer_close(struct inode *inp, struct file *filp)
891{
892 struct eerbuffer *eerb;
893 unsigned long flags;
894
895 eerb = (struct eerbuffer *)filp->private_data;
896 spin_lock_irqsave(&bufferlock, flags);
897 list_del(&eerb->list);
898 spin_unlock_irqrestore(&bufferlock, flags);
899 dasd_eer_free_buffer_pages(eerb->buffer, eerb->buffer_page_count);
900 kfree(eerb->buffer);
901 kfree(eerb);
902
903 return 0;
904}
905
906static long
907dasd_eer_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
908{
909 int intval;
910 struct eerbuffer *eerb;
911
912 eerb = (struct eerbuffer *)filp->private_data;
913 switch (cmd) {
914 case DASD_EER_PURGE:
915 dasd_eer_purge_buffer(eerb);
916 return 0;
917 case DASD_EER_SETBUFSIZE:
918 if (get_user(intval, (int __user *)arg))
919 return -EFAULT;
920 return dasd_eer_resize_buffer(eerb, intval);
921 default:
922 return -ENOIOCTLCMD;
923 }
924}
925
926static ssize_t
927dasd_eer_read(struct file *filp, char __user *buf, size_t count, loff_t *ppos)
928{
929 int tc,rc;
930 int tailcount,effective_count;
931 unsigned long flags;
932 struct eerbuffer *eerb;
933
934 eerb = (struct eerbuffer *)filp->private_data;
935 if(down_interruptible(&readbuffer_mutex))
936 return -ERESTARTSYS;
937
938 spin_lock_irqsave(&bufferlock, flags);
939
940 if (eerb->residual < 0) { /* the remainder of this record */
941 /* has been deleted */
942 eerb->residual = 0;
943 spin_unlock_irqrestore(&bufferlock, flags);
944 up(&readbuffer_mutex);
945 return -EIO;
946 } else if (eerb->residual > 0) {
947 /* OK we still have a second half of a record to deliver */
948 effective_count = min(eerb->residual, (int)count);
949 eerb->residual -= effective_count;
950 } else {
951 tc = 0;
952 while (!tc) {
953 tc = dasd_eer_read_buffer(eerb,
954 sizeof(tailcount), (char*)(&tailcount));
955 if (!tc) {
956 /* no data available */
957 spin_unlock_irqrestore(&bufferlock, flags);
958 up(&readbuffer_mutex);
959 if (filp->f_flags & O_NONBLOCK)
960 return -EAGAIN;
961 rc = wait_event_interruptible(
962 dasd_eer_read_wait_queue,
963 eerb->head != eerb->tail);
964 if (rc) {
965 return rc;
966 }
967 if(down_interruptible(&readbuffer_mutex))
968 return -ERESTARTSYS;
969 spin_lock_irqsave(&bufferlock, flags);
970 }
971 }
972 WARN_ON(tc != sizeof(tailcount));
973 effective_count = min(tailcount,(int)count);
974 eerb->residual = tailcount - effective_count;
975 }
976
977 tc = dasd_eer_read_buffer(eerb, effective_count, readbuffer);
978 WARN_ON(tc != effective_count);
979
980 spin_unlock_irqrestore(&bufferlock, flags);
981
982 if (copy_to_user(buf, readbuffer, effective_count)) {
983 up(&readbuffer_mutex);
984 return -EFAULT;
985 }
986
987 up(&readbuffer_mutex);
988 return effective_count;
989}
990
991static unsigned int
992dasd_eer_poll (struct file *filp, poll_table *ptable)
993{
994 unsigned int mask;
995 unsigned long flags;
996 struct eerbuffer *eerb;
997
998 eerb = (struct eerbuffer *)filp->private_data;
999 poll_wait(filp, &dasd_eer_read_wait_queue, ptable);
1000 spin_lock_irqsave(&bufferlock, flags);
1001 if (eerb->head != eerb->tail)
1002 mask = POLLIN | POLLRDNORM ;
1003 else
1004 mask = 0;
1005 spin_unlock_irqrestore(&bufferlock, flags);
1006 return mask;
1007}
1008
1009static struct file_operations dasd_eer_fops = {
1010 .open = &dasd_eer_open,
1011 .release = &dasd_eer_close,
1012 .unlocked_ioctl = &dasd_eer_ioctl,
1013 .compat_ioctl = &dasd_eer_ioctl,
1014 .read = &dasd_eer_read,
1015 .poll = &dasd_eer_poll,
1016 .owner = THIS_MODULE,
1017};
1018
1019static struct miscdevice dasd_eer_dev = {
1020 .minor = MISC_DYNAMIC_MINOR,
1021 .name = "dasd_eer",
1022 .fops = &dasd_eer_fops,
1023};
1024
1025
1026/*****************************************************************************/
1027/* Init and exit */
1028/*****************************************************************************/
1029
1030static int
1031__init dasd_eer_init(void)
1032{
1033 int rc;
1034
1035 dasd_eer_workqueue = create_singlethread_workqueue("dasd_eer");
1036 if (!dasd_eer_workqueue) {
1037 MESSAGE(KERN_ERR , "%s", "dasd_eer_init could not "
1038 "create workqueue \n");
1039 rc = -ENOMEM;
1040 goto out;
1041 }
1042
1043 rc = dasd_register_eer_notifier(&dasd_eer_nb);
1044 if (rc) {
1045 MESSAGE(KERN_ERR, "%s", "dasd_eer_init could not "
1046 "register error reporting");
1047 goto queue;
1048 }
1049
1050 dasd_ioctl_no_register(THIS_MODULE, BIODASDEERSET, dasd_ioctl_set_eer);
1051 dasd_ioctl_no_register(THIS_MODULE, BIODASDEERGET, dasd_ioctl_get_eer);
1052
1053 /* we don't need our own character device,
1054 * so we just register as misc device */
1055 rc = misc_register(&dasd_eer_dev);
1056 if (rc) {
1057 MESSAGE(KERN_ERR, "%s", "dasd_eer_init could not "
1058 "register misc device");
1059 goto unregister;
1060 }
1061
1062 return 0;
1063
1064unregister:
1065 dasd_unregister_eer_notifier(&dasd_eer_nb);
1066 dasd_ioctl_no_unregister(THIS_MODULE, BIODASDEERSET,
1067 dasd_ioctl_set_eer);
1068 dasd_ioctl_no_unregister(THIS_MODULE, BIODASDEERGET,
1069 dasd_ioctl_get_eer);
1070queue:
1071 destroy_workqueue(dasd_eer_workqueue);
1072out:
1073 return rc;
1074
1075}
1076module_init(dasd_eer_init);
1077
1078static void
1079__exit dasd_eer_exit(void)
1080{
1081 dasd_unregister_eer_notifier(&dasd_eer_nb);
1082 dasd_ioctl_no_unregister(THIS_MODULE, BIODASDEERSET,
1083 dasd_ioctl_set_eer);
1084 dasd_ioctl_no_unregister(THIS_MODULE, BIODASDEERGET,
1085 dasd_ioctl_get_eer);
1086 destroy_workqueue(dasd_eer_workqueue);
1087
1088 WARN_ON(misc_deregister(&dasd_eer_dev) != 0);
1089}
1090module_exit(dasd_eer_exit);
diff --git a/drivers/s390/block/dasd_int.h b/drivers/s390/block/dasd_int.h
index 5efac1b97ece..0592354cc604 100644
--- a/drivers/s390/block/dasd_int.h
+++ b/drivers/s390/block/dasd_int.h
@@ -275,34 +275,6 @@ struct dasd_discipline {
275 275
276extern struct dasd_discipline *dasd_diag_discipline_pointer; 276extern struct dasd_discipline *dasd_diag_discipline_pointer;
277 277
278
279/*
280 * Notification numbers for extended error reporting notifications:
281 * The DASD_EER_DISABLE notification is sent before a dasd_device (and it's
282 * eer pointer) is freed. The error reporting module needs to do all necessary
283 * cleanup steps.
284 * The DASD_EER_TRIGGER notification sends the actual error reports (triggers).
285 */
286#define DASD_EER_DISABLE 0
287#define DASD_EER_TRIGGER 1
288
289/* Trigger IDs for extended error reporting DASD_EER_TRIGGER notification */
290#define DASD_EER_FATALERROR 1
291#define DASD_EER_NOPATH 2
292#define DASD_EER_STATECHANGE 3
293#define DASD_EER_PPRCSUSPEND 4
294
295/*
296 * The dasd_eer_trigger structure contains all data that we need to send
297 * along with an DASD_EER_TRIGGER notification.
298 */
299struct dasd_eer_trigger {
300 unsigned int id;
301 struct dasd_device *device;
302 struct dasd_ccw_req *cqr;
303};
304
305
306struct dasd_device { 278struct dasd_device {
307 /* Block device stuff. */ 279 /* Block device stuff. */
308 struct gendisk *gdp; 280 struct gendisk *gdp;
@@ -316,9 +288,6 @@ struct dasd_device {
316 unsigned long flags; /* per device flags */ 288 unsigned long flags; /* per device flags */
317 unsigned short features; /* copy of devmap-features (read-only!) */ 289 unsigned short features; /* copy of devmap-features (read-only!) */
318 290
319 /* extended error reporting stuff (eer) */
320 void *eer;
321
322 /* Device discipline stuff. */ 291 /* Device discipline stuff. */
323 struct dasd_discipline *discipline; 292 struct dasd_discipline *discipline;
324 struct dasd_discipline *base_discipline; 293 struct dasd_discipline *base_discipline;
@@ -520,12 +489,6 @@ int dasd_generic_set_online(struct ccw_device *, struct dasd_discipline *);
520int dasd_generic_set_offline (struct ccw_device *cdev); 489int dasd_generic_set_offline (struct ccw_device *cdev);
521int dasd_generic_notify(struct ccw_device *, int); 490int dasd_generic_notify(struct ccw_device *, int);
522void dasd_generic_auto_online (struct ccw_driver *); 491void dasd_generic_auto_online (struct ccw_driver *);
523int dasd_register_eer_notifier(struct notifier_block *);
524int dasd_unregister_eer_notifier(struct notifier_block *);
525void dasd_write_eer_trigger(unsigned int , struct dasd_device *,
526 struct dasd_ccw_req *);
527
528
529 492
530/* externals in dasd_devmap.c */ 493/* externals in dasd_devmap.c */
531extern int dasd_max_devindex; 494extern int dasd_max_devindex;
diff --git a/include/asm-s390/dasd.h b/include/asm-s390/dasd.h
index c744ff33b1df..1630c26e8f45 100644
--- a/include/asm-s390/dasd.h
+++ b/include/asm-s390/dasd.h
@@ -204,8 +204,7 @@ typedef struct attrib_data_t {
204 * 204 *
205 * Here ist how the ioctl-nr should be used: 205 * Here ist how the ioctl-nr should be used:
206 * 0 - 31 DASD driver itself 206 * 0 - 31 DASD driver itself
207 * 32 - 229 still open 207 * 32 - 239 still open
208 * 230 - 239 DASD extended error reporting
209 * 240 - 255 reserved for EMC 208 * 240 - 255 reserved for EMC
210 *******************************************************************************/ 209 *******************************************************************************/
211 210
@@ -237,22 +236,12 @@ typedef struct attrib_data_t {
237#define BIODASDPSRD _IOR(DASD_IOCTL_LETTER,4,dasd_rssd_perf_stats_t) 236#define BIODASDPSRD _IOR(DASD_IOCTL_LETTER,4,dasd_rssd_perf_stats_t)
238/* Get Attributes (cache operations) */ 237/* Get Attributes (cache operations) */
239#define BIODASDGATTR _IOR(DASD_IOCTL_LETTER,5,attrib_data_t) 238#define BIODASDGATTR _IOR(DASD_IOCTL_LETTER,5,attrib_data_t)
240/* retrieve extended error-reporting value */
241#define BIODASDEERGET _IOR(DASD_IOCTL_LETTER,6,int)
242 239
243 240
244/* #define BIODASDFORMAT _IOW(IOCTL_LETTER,0,format_data_t) , deprecated */ 241/* #define BIODASDFORMAT _IOW(IOCTL_LETTER,0,format_data_t) , deprecated */
245#define BIODASDFMT _IOW(DASD_IOCTL_LETTER,1,format_data_t) 242#define BIODASDFMT _IOW(DASD_IOCTL_LETTER,1,format_data_t)
246/* Set Attributes (cache operations) */ 243/* Set Attributes (cache operations) */
247#define BIODASDSATTR _IOW(DASD_IOCTL_LETTER,2,attrib_data_t) 244#define BIODASDSATTR _IOW(DASD_IOCTL_LETTER,2,attrib_data_t)
248/* retrieve extended error-reporting value */
249#define BIODASDEERSET _IOW(DASD_IOCTL_LETTER,3,int)
250
251
252/* remove all records from the eer buffer */
253#define DASD_EER_PURGE _IO(DASD_IOCTL_LETTER,230)
254/* set the number of pages that are used for the internal eer buffer */
255#define DASD_EER_SETBUFSIZE _IOW(DASD_IOCTL_LETTER,230,int)
256 245
257 246
258#endif /* DASD_H */ 247#endif /* DASD_H */
generated by cgit v1.2.2 (git 2.25.0) at 2025-11-24 05:59:16 -0500