xref: /linux/drivers/s390/block/dasd_erp.c (revision f3d9478b2ce468c3115b02ecae7e975990697f15)
1 /*
2  * File...........: linux/drivers/s390/block/dasd.c
3  * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
4  *		    Horst Hummel <Horst.Hummel@de.ibm.com>
5  *		    Carsten Otte <Cotte@de.ibm.com>
6  *		    Martin Schwidefsky <schwidefsky@de.ibm.com>
7  * Bugreports.to..: <Linux390@de.ibm.com>
8  * (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999-2001
9  *
10  */
11 
12 #include <linux/config.h>
13 #include <linux/ctype.h>
14 #include <linux/init.h>
15 
16 #include <asm/debug.h>
17 #include <asm/ebcdic.h>
18 #include <asm/uaccess.h>
19 
20 /* This is ugly... */
21 #define PRINTK_HEADER "dasd_erp:"
22 
23 #include "dasd_int.h"
24 
25 struct dasd_ccw_req *
26 dasd_alloc_erp_request(char *magic, int cplength, int datasize,
27 		       struct dasd_device * device)
28 {
29 	unsigned long flags;
30 	struct dasd_ccw_req *cqr;
31 	char *data;
32 	int size;
33 
34 	/* Sanity checks */
35 	BUG_ON( magic == NULL || datasize > PAGE_SIZE ||
36 	     (cplength*sizeof(struct ccw1)) > PAGE_SIZE);
37 
38 	size = (sizeof(struct dasd_ccw_req) + 7L) & -8L;
39 	if (cplength > 0)
40 		size += cplength * sizeof(struct ccw1);
41 	if (datasize > 0)
42 		size += datasize;
43 	spin_lock_irqsave(&device->mem_lock, flags);
44 	cqr = (struct dasd_ccw_req *)
45 		dasd_alloc_chunk(&device->erp_chunks, size);
46 	spin_unlock_irqrestore(&device->mem_lock, flags);
47 	if (cqr == NULL)
48 		return ERR_PTR(-ENOMEM);
49 	memset(cqr, 0, sizeof(struct dasd_ccw_req));
50 	data = (char *) cqr + ((sizeof(struct dasd_ccw_req) + 7L) & -8L);
51 	cqr->cpaddr = NULL;
52 	if (cplength > 0) {
53 		cqr->cpaddr = (struct ccw1 *) data;
54 		data += cplength*sizeof(struct ccw1);
55 		memset(cqr->cpaddr, 0, cplength*sizeof(struct ccw1));
56 	}
57 	cqr->data = NULL;
58 	if (datasize > 0) {
59 		cqr->data = data;
60  		memset(cqr->data, 0, datasize);
61 	}
62 	strncpy((char *) &cqr->magic, magic, 4);
63 	ASCEBC((char *) &cqr->magic, 4);
64 	set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
65 	dasd_get_device(device);
66 	return cqr;
67 }
68 
69 void
70 dasd_free_erp_request(struct dasd_ccw_req * cqr, struct dasd_device * device)
71 {
72 	unsigned long flags;
73 
74 	spin_lock_irqsave(&device->mem_lock, flags);
75 	dasd_free_chunk(&device->erp_chunks, cqr);
76 	spin_unlock_irqrestore(&device->mem_lock, flags);
77 	atomic_dec(&device->ref_count);
78 }
79 
80 
81 /*
82  * dasd_default_erp_action just retries the current cqr
83  */
84 struct dasd_ccw_req *
85 dasd_default_erp_action(struct dasd_ccw_req * cqr)
86 {
87 	struct dasd_device *device;
88 
89 	device = cqr->device;
90 
91         /* just retry - there is nothing to save ... I got no sense data.... */
92         if (cqr->retries > 0) {
93                 DEV_MESSAGE (KERN_DEBUG, device,
94                              "default ERP called (%i retries left)",
95                              cqr->retries);
96 		cqr->lpm    = LPM_ANYPATH;
97 		cqr->status = DASD_CQR_QUEUED;
98         } else {
99                 DEV_MESSAGE (KERN_WARNING, device, "%s",
100 			     "default ERP called (NO retry left)");
101 		cqr->status = DASD_CQR_FAILED;
102 		cqr->stopclk = get_clock ();
103         }
104         return cqr;
105 }				/* end dasd_default_erp_action */
106 
107 /*
108  * DESCRIPTION
109  *   Frees all ERPs of the current ERP Chain and set the status
110  *   of the original CQR either to DASD_CQR_DONE if ERP was successful
111  *   or to DASD_CQR_FAILED if ERP was NOT successful.
112  *   NOTE: This function is only called if no discipline postaction
113  *	   is available
114  *
115  * PARAMETER
116  *   erp		current erp_head
117  *
118  * RETURN VALUES
119  *   cqr		pointer to the original CQR
120  */
121 struct dasd_ccw_req *
122 dasd_default_erp_postaction(struct dasd_ccw_req * cqr)
123 {
124 	struct dasd_device *device;
125 	int success;
126 
127 	BUG_ON(cqr->refers == NULL || cqr->function == NULL);
128 
129 	device = cqr->device;
130 	success = cqr->status == DASD_CQR_DONE;
131 
132 	/* free all ERPs - but NOT the original cqr */
133 	while (cqr->refers != NULL) {
134 		struct dasd_ccw_req *refers;
135 
136 		refers = cqr->refers;
137 		/* remove the request from the device queue */
138 		list_del(&cqr->list);
139 		/* free the finished erp request */
140 		dasd_free_erp_request(cqr, device);
141 		cqr = refers;
142 	}
143 
144 	/* set corresponding status to original cqr */
145 	if (success)
146 		cqr->status = DASD_CQR_DONE;
147 	else {
148 		cqr->status = DASD_CQR_FAILED;
149 		cqr->stopclk = get_clock();
150 	}
151 
152 	return cqr;
153 
154 }				/* end default_erp_postaction */
155 
156 /*
157  * Print the hex dump of the memory used by a request. This includes
158  * all error recovery ccws that have been chained in from of the
159  * real request.
160  */
161 static inline void
162 hex_dump_memory(struct dasd_device *device, void *data, int len)
163 {
164 	int *pint;
165 
166 	pint = (int *) data;
167 	while (len > 0) {
168 		DEV_MESSAGE(KERN_ERR, device, "%p: %08x %08x %08x %08x",
169 			    pint, pint[0], pint[1], pint[2], pint[3]);
170 		pint += 4;
171 		len -= 16;
172 	}
173 }
174 
175 void
176 dasd_log_sense(struct dasd_ccw_req *cqr, struct irb *irb)
177 {
178 	struct dasd_device *device;
179 
180 	device = cqr->device;
181 	/* dump sense data */
182 	if (device->discipline && device->discipline->dump_sense)
183 		device->discipline->dump_sense(device, cqr, irb);
184 }
185 
186 void
187 dasd_log_ccw(struct dasd_ccw_req * cqr, int caller, __u32 cpa)
188 {
189 	struct dasd_device *device;
190 	struct dasd_ccw_req *lcqr;
191 	struct ccw1 *ccw;
192 	int cplength;
193 
194 	device = cqr->device;
195 	/* log the channel program */
196 	for (lcqr = cqr; lcqr != NULL; lcqr = lcqr->refers) {
197 		DEV_MESSAGE(KERN_ERR, device,
198 			    "(%s) ERP chain report for req: %p",
199 			    caller == 0 ? "EXAMINE" : "ACTION", lcqr);
200 		hex_dump_memory(device, lcqr, sizeof(struct dasd_ccw_req));
201 
202 		cplength = 1;
203 		ccw = lcqr->cpaddr;
204 		while (ccw++->flags & (CCW_FLAG_DC | CCW_FLAG_CC))
205 			cplength++;
206 
207 		if (cplength > 40) {	/* log only parts of the CP */
208 			DEV_MESSAGE(KERN_ERR, device, "%s",
209 				    "Start of channel program:");
210 			hex_dump_memory(device, lcqr->cpaddr,
211 					40*sizeof(struct ccw1));
212 
213 			DEV_MESSAGE(KERN_ERR, device, "%s",
214 				    "End of channel program:");
215 			hex_dump_memory(device, lcqr->cpaddr + cplength - 10,
216 					10*sizeof(struct ccw1));
217 		} else {	/* log the whole CP */
218 			DEV_MESSAGE(KERN_ERR, device, "%s",
219 				    "Channel program (complete):");
220 			hex_dump_memory(device, lcqr->cpaddr,
221 					cplength*sizeof(struct ccw1));
222 		}
223 
224 		if (lcqr != cqr)
225 			continue;
226 
227 		/*
228 		 * Log bytes arround failed CCW but only if we did
229 		 * not log the whole CP of the CCW is outside the
230 		 * logged CP.
231 		 */
232 		if (cplength > 40 ||
233 		    ((addr_t) cpa < (addr_t) lcqr->cpaddr &&
234 		     (addr_t) cpa > (addr_t) (lcqr->cpaddr + cplength + 4))) {
235 
236 			DEV_MESSAGE(KERN_ERR, device,
237 				    "Failed CCW (%p) (area):",
238 				    (void *) (long) cpa);
239 			hex_dump_memory(device, cqr->cpaddr - 10,
240 					20*sizeof(struct ccw1));
241 		}
242 	}
243 
244 }				/* end log_erp_chain */
245 
246 EXPORT_SYMBOL(dasd_default_erp_action);
247 EXPORT_SYMBOL(dasd_default_erp_postaction);
248 EXPORT_SYMBOL(dasd_alloc_erp_request);
249 EXPORT_SYMBOL(dasd_free_erp_request);
250 EXPORT_SYMBOL(dasd_log_sense);
251 EXPORT_SYMBOL(dasd_log_ccw);
252