2 * File...........: linux/drivers/s390/block/dasd_fba.c
3 * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
4 * Bugreports.to..: <Linux390@de.ibm.com>
5 * (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999,2000
10 #include <linux/config.h>
11 #include <linux/stddef.h>
12 #include <linux/kernel.h>
13 #include <asm/debug.h>
15 #include <linux/slab.h>
16 #include <linux/hdreg.h> /* HDIO_GETGEO */
17 #include <linux/bio.h>
18 #include <linux/module.h>
19 #include <linux/init.h>
21 #include <asm/idals.h>
22 #include <asm/ebcdic.h>
24 #include <asm/todclk.h>
25 #include <asm/ccwdev.h>
32 #endif /* PRINTK_HEADER */
33 #define PRINTK_HEADER "dasd(fba):"
35 #define DASD_FBA_CCW_WRITE 0x41
36 #define DASD_FBA_CCW_READ 0x42
37 #define DASD_FBA_CCW_LOCATE 0x43
38 #define DASD_FBA_CCW_DEFINE_EXTENT 0x63
40 MODULE_LICENSE("GPL");
42 static struct dasd_discipline dasd_fba_discipline;
44 struct dasd_fba_private {
45 struct dasd_fba_characteristics rdc_data;
48 static struct ccw_device_id dasd_fba_ids[] = {
49 { CCW_DEVICE_DEVTYPE (0x6310, 0, 0x9336, 0), driver_info: 0x1},
50 { CCW_DEVICE_DEVTYPE (0x3880, 0, 0x3370, 0), driver_info: 0x2},
51 { /* end of list */ },
54 MODULE_DEVICE_TABLE(ccw, dasd_fba_ids);
56 static struct ccw_driver dasd_fba_driver; /* see below */
58 dasd_fba_probe(struct ccw_device *cdev)
62 ret = dasd_generic_probe (cdev, &dasd_fba_discipline);
65 ccw_device_set_options(cdev, CCWDEV_DO_PATHGROUP);
70 dasd_fba_set_online(struct ccw_device *cdev)
72 return dasd_generic_set_online (cdev, &dasd_fba_discipline);
75 static struct ccw_driver dasd_fba_driver = {
79 .probe = dasd_fba_probe,
80 .remove = dasd_generic_remove,
81 .set_offline = dasd_generic_set_offline,
82 .set_online = dasd_fba_set_online,
83 .notify = dasd_generic_notify,
87 define_extent(struct ccw1 * ccw, struct DE_fba_data *data, int rw,
88 int blksize, int beg, int nr)
90 ccw->cmd_code = DASD_FBA_CCW_DEFINE_EXTENT;
93 ccw->cda = (__u32) __pa(data);
94 memset(data, 0, sizeof (struct DE_fba_data));
96 (data->mask).perm = 0x0;
98 (data->mask).perm = 0x1;
100 data->mask.perm = 0x2;
101 data->blk_size = blksize;
103 data->ext_end = nr - 1;
107 locate_record(struct ccw1 * ccw, struct LO_fba_data *data, int rw,
108 int block_nr, int block_ct)
110 ccw->cmd_code = DASD_FBA_CCW_LOCATE;
113 ccw->cda = (__u32) __pa(data);
114 memset(data, 0, sizeof (struct LO_fba_data));
116 data->operation.cmd = 0x5;
118 data->operation.cmd = 0x6;
120 data->operation.cmd = 0x8;
121 data->blk_nr = block_nr;
122 data->blk_ct = block_ct;
126 dasd_fba_check_characteristics(struct dasd_device *device)
128 struct dasd_fba_private *private;
129 struct ccw_device *cdev = device->cdev;
133 private = (struct dasd_fba_private *) device->private;
134 if (private == NULL) {
135 private = kmalloc(sizeof(struct dasd_fba_private), GFP_KERNEL);
136 if (private == NULL) {
137 MESSAGE(KERN_WARNING, "%s",
138 "memory allocation failed for private data");
141 device->private = (void *) private;
143 /* Read Device Characteristics */
144 rdc_data = (void *) &(private->rdc_data);
145 rc = read_dev_chars(device->cdev, &rdc_data, 32);
147 MESSAGE(KERN_WARNING,
148 "Read device characteristics returned error %d", rc);
152 DEV_MESSAGE(KERN_INFO, device,
153 "%04X/%02X(CU:%04X/%02X) %dMB at(%d B/blk)",
158 ((private->rdc_data.blk_bdsa *
159 (private->rdc_data.blk_size >> 9)) >> 11),
160 private->rdc_data.blk_size);
165 dasd_fba_do_analysis(struct dasd_device *device)
167 struct dasd_fba_private *private;
170 private = (struct dasd_fba_private *) device->private;
171 rc = dasd_check_blocksize(private->rdc_data.blk_size);
173 DEV_MESSAGE(KERN_INFO, device, "unknown blocksize %d",
174 private->rdc_data.blk_size);
177 device->blocks = private->rdc_data.blk_bdsa;
178 device->bp_block = private->rdc_data.blk_size;
179 device->s2b_shift = 0; /* bits to shift 512 to get a block */
180 for (sb = 512; sb < private->rdc_data.blk_size; sb = sb << 1)
186 dasd_fba_fill_geometry(struct dasd_device *device, struct hd_geometry *geo)
188 if (dasd_check_blocksize(device->bp_block) != 0)
190 geo->cylinders = (device->blocks << device->s2b_shift) >> 10;
192 geo->sectors = 128 >> device->s2b_shift;
197 dasd_fba_examine_error(struct dasd_ccw_req * cqr, struct irb * irb)
199 struct dasd_device *device;
200 struct ccw_device *cdev;
202 device = (struct dasd_device *) cqr->device;
203 if (irb->scsw.cstat == 0x00 &&
204 irb->scsw.dstat == (DEV_STAT_CHN_END | DEV_STAT_DEV_END))
205 return dasd_era_none;
208 switch (cdev->id.dev_type) {
210 return dasd_3370_erp_examine(cqr, irb);
212 return dasd_9336_erp_examine(cqr, irb);
214 return dasd_era_recover;
219 dasd_fba_erp_action(struct dasd_ccw_req * cqr)
221 return dasd_default_erp_action;
225 dasd_fba_erp_postaction(struct dasd_ccw_req * cqr)
227 if (cqr->function == dasd_default_erp_action)
228 return dasd_default_erp_postaction;
230 MESSAGE(KERN_WARNING, "unknown ERP action %p", cqr->function);
235 static struct dasd_ccw_req *
236 dasd_fba_build_cp(struct dasd_device * device, struct request *req)
238 struct dasd_fba_private *private;
239 unsigned long *idaws;
240 struct LO_fba_data *LO_data;
241 struct dasd_ccw_req *cqr;
246 int count, cidaw, cplength, datasize;
247 sector_t recid, first_rec, last_rec;
248 unsigned int blksize, off;
252 private = (struct dasd_fba_private *) device->private;
253 if (rq_data_dir(req) == READ) {
254 cmd = DASD_FBA_CCW_READ;
255 } else if (rq_data_dir(req) == WRITE) {
256 cmd = DASD_FBA_CCW_WRITE;
258 return ERR_PTR(-EINVAL);
259 blksize = device->bp_block;
260 /* Calculate record id of first and last block. */
261 first_rec = req->sector >> device->s2b_shift;
262 last_rec = (req->sector + req->nr_sectors - 1) >> device->s2b_shift;
263 /* Check struct bio and count the number of blocks for the request. */
266 rq_for_each_bio(bio, req) {
267 bio_for_each_segment(bv, bio, i) {
268 if (bv->bv_len & (blksize - 1))
269 /* Fba can only do full blocks. */
270 return ERR_PTR(-EINVAL);
271 count += bv->bv_len >> (device->s2b_shift + 9);
272 #if defined(CONFIG_ARCH_S390X)
273 if (idal_is_needed (page_address(bv->bv_page), bv->bv_len))
274 cidaw += bv->bv_len / blksize;
279 if (count != last_rec - first_rec + 1)
280 return ERR_PTR(-EINVAL);
281 /* 1x define extent + 1x locate record + number of blocks */
282 cplength = 2 + count;
283 /* 1x define extent + 1x locate record */
284 datasize = sizeof(struct DE_fba_data) + sizeof(struct LO_fba_data) +
285 cidaw * sizeof(unsigned long);
287 * Find out number of additional locate record ccws if the device
288 * can't do data chaining.
290 if (private->rdc_data.mode.bits.data_chain == 0) {
291 cplength += count - 1;
292 datasize += (count - 1)*sizeof(struct LO_fba_data);
294 /* Allocate the ccw request. */
295 cqr = dasd_smalloc_request(dasd_fba_discipline.name,
296 cplength, datasize, device);
300 /* First ccw is define extent. */
301 define_extent(ccw++, cqr->data, rq_data_dir(req),
302 device->bp_block, req->sector, req->nr_sectors);
303 /* Build locate_record + read/write ccws. */
304 idaws = (unsigned long *) (cqr->data + sizeof(struct DE_fba_data));
305 LO_data = (struct LO_fba_data *) (idaws + cidaw);
306 /* Locate record for all blocks for smart devices. */
307 if (private->rdc_data.mode.bits.data_chain != 0) {
308 ccw[-1].flags |= CCW_FLAG_CC;
309 locate_record(ccw++, LO_data++, rq_data_dir(req), 0, count);
312 rq_for_each_bio(bio, req) bio_for_each_segment(bv, bio, i) {
313 dst = page_address(bv->bv_page) + bv->bv_offset;
314 for (off = 0; off < bv->bv_len; off += blksize) {
315 /* Locate record for stupid devices. */
316 if (private->rdc_data.mode.bits.data_chain == 0) {
317 ccw[-1].flags |= CCW_FLAG_CC;
318 locate_record(ccw, LO_data++,
320 recid - first_rec, 1);
321 ccw->flags = CCW_FLAG_CC;
324 if (recid > first_rec)
325 ccw[-1].flags |= CCW_FLAG_DC;
327 ccw[-1].flags |= CCW_FLAG_CC;
330 ccw->count = device->bp_block;
331 if (idal_is_needed(dst, blksize)) {
332 ccw->cda = (__u32)(addr_t) idaws;
333 ccw->flags = CCW_FLAG_IDA;
334 idaws = idal_create_words(idaws, dst, blksize);
336 ccw->cda = (__u32)(addr_t) dst;
344 cqr->device = device;
345 cqr->expires = 5 * 60 * HZ; /* 5 minutes */
346 cqr->status = DASD_CQR_FILLED;
351 dasd_fba_fill_info(struct dasd_device * device,
352 struct dasd_information2_t * info)
354 info->label_block = 1;
355 info->FBA_layout = 1;
356 info->format = DASD_FORMAT_LDL;
357 info->characteristics_size = sizeof(struct dasd_fba_characteristics);
358 memcpy(info->characteristics,
359 &((struct dasd_fba_private *) device->private)->rdc_data,
360 sizeof (struct dasd_fba_characteristics));
361 info->confdata_size = 0;
366 dasd_fba_dump_sense(struct dasd_device *device, struct dasd_ccw_req * req,
371 page = (char *) get_zeroed_page(GFP_KERNEL);
373 MESSAGE(KERN_ERR, "%s", "No memory to dump sense data");
376 sprintf(page, KERN_WARNING PRINTK_HEADER
377 "device %s: I/O status report:\n",
378 device->cdev->dev.bus_id);
380 MESSAGE(KERN_ERR, "Sense data:\n%s", page);
382 free_page((unsigned long) page);
386 * max_blocks is dependent on the amount of storage that is available
387 * in the static io buffer for each device. Currently each device has
388 * 8192 bytes (=2 pages). For 64 bit one dasd_mchunkt_t structure has
389 * 24 bytes, the struct dasd_ccw_req has 136 bytes and each block can use
390 * up to 16 bytes (8 for the ccw and 8 for the idal pointer). In
391 * addition we have one define extent ccw + 16 bytes of data and a
392 * locate record ccw for each block (stupid devices!) + 16 bytes of data.
394 * (8192 - 24 - 136 - 8 - 16) / 40 = 200.2 blocks at maximum.
395 * We want to fit two into the available memory so that we can immediately
396 * start the next request if one finishes off. That makes 100.1 blocks
397 * for one request. Give a little safety and the result is 96.
399 static struct dasd_discipline dasd_fba_discipline = {
400 .owner = THIS_MODULE,
404 .check_device = dasd_fba_check_characteristics,
405 .do_analysis = dasd_fba_do_analysis,
406 .fill_geometry = dasd_fba_fill_geometry,
407 .start_IO = dasd_start_IO,
408 .term_IO = dasd_term_IO,
409 .examine_error = dasd_fba_examine_error,
410 .erp_action = dasd_fba_erp_action,
411 .erp_postaction = dasd_fba_erp_postaction,
412 .build_cp = dasd_fba_build_cp,
413 .dump_sense = dasd_fba_dump_sense,
414 .fill_info = dasd_fba_fill_info,
422 ASCEBC(dasd_fba_discipline.ebcname, 4);
424 ret = ccw_driver_register(&dasd_fba_driver);
428 dasd_generic_auto_online(&dasd_fba_driver);
433 dasd_fba_cleanup(void)
435 ccw_driver_unregister(&dasd_fba_driver);
438 module_init(dasd_fba_init);
439 module_exit(dasd_fba_cleanup);
442 * Overrides for Emacs so that we follow Linus's tabbing style.
443 * Emacs will notice this stuff at the end of the file and automatically
444 * adjust the settings for this buffer only. This must remain at the end
446 * ---------------------------------------------------------------------------
449 * c-brace-imaginary-offset: 0
451 * c-argdecl-indent: 4
453 * c-continued-statement-offset: 4
454 * c-continued-brace-offset: 0
455 * indent-tabs-mode: 1