X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=drivers%2Fs390%2Fblock%2Fdasd_diag.c;h=3f9d704d2657483f739dcced896a212413665882;hb=43bc926fffd92024b46cafaf7350d669ba9ca884;hp=127699830fa18a46ee98836af72ebdbf16d89f1e;hpb=cee37fe97739d85991964371c1f3a745c00dd236;p=linux-2.6.git diff --git a/drivers/s390/block/dasd_diag.c b/drivers/s390/block/dasd_diag.c index 127699830..3f9d704d2 100644 --- a/drivers/s390/block/dasd_diag.c +++ b/drivers/s390/block/dasd_diag.c @@ -6,17 +6,17 @@ * Bugreports.to..: * (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999,2000 * - * $Revision: 1.42 $ */ #include #include #include #include -#include /* HDIO_GETGEO */ +#include #include #include #include +#include #include #include @@ -24,62 +24,94 @@ #include #include #include +#include #include "dasd_int.h" #include "dasd_diag.h" -#ifdef PRINTK_HEADER -#undef PRINTK_HEADER -#endif /* PRINTK_HEADER */ #define PRINTK_HEADER "dasd(diag):" MODULE_LICENSE("GPL"); +/* The maximum number of blocks per request (max_blocks) is dependent on the + * amount of storage that is available in the static I/O buffer for each + * device. Currently each device gets 2 pages. We want to fit two requests + * into the available memory so that we can immediately start the next if one + * finishes. */ +#define DIAG_MAX_BLOCKS (((2 * PAGE_SIZE - sizeof(struct dasd_ccw_req) - \ + sizeof(struct dasd_diag_req)) / \ + sizeof(struct dasd_diag_bio)) / 2) +#define DIAG_MAX_RETRIES 32 +#define DIAG_TIMEOUT 50 * HZ + struct dasd_discipline dasd_diag_discipline; struct dasd_diag_private { struct dasd_diag_characteristics rdc_data; struct dasd_diag_rw_io iob; struct dasd_diag_init_io iib; - unsigned int pt_block; + blocknum_t pt_block; }; struct dasd_diag_req { - int block_count; + unsigned int block_count; struct dasd_diag_bio bio[0]; }; +static const u8 DASD_DIAG_CMS1[] = { 0xc3, 0xd4, 0xe2, 0xf1 };/* EBCDIC CMS1 */ + +/* Perform DIAG250 call with block I/O parameter list iob (input and output) + * and function code cmd. + * In case of an exception return 3. Otherwise return result of bitwise OR of + * resulting condition code and DIAG return code. */ static __inline__ int dia250(void *iob, int cmd) { + typedef union { + struct dasd_diag_init_io init_io; + struct dasd_diag_rw_io rw_io; + } addr_type; int rc; - __asm__ __volatile__(" lhi %0,3\n" - " lr 0,%2\n" - " diag 0,%1,0x250\n" - "0: ipm %0\n" - " srl %0,28\n" - " or %0,1\n" - "1:\n" -#ifndef CONFIG_ARCH_S390X - ".section __ex_table,\"a\"\n" - " .align 4\n" - " .long 0b,1b\n" - ".previous\n" + __asm__ __volatile__( +#ifdef CONFIG_64BIT + " lghi %0,3\n" + " lgr 0,%3\n" + " diag 0,%2,0x250\n" + "0: ipm %0\n" + " srl %0,28\n" + " or %0,1\n" + "1:\n" + ".section __ex_table,\"a\"\n" + " .align 8\n" + " .quad 0b,1b\n" + ".previous\n" #else - ".section __ex_table,\"a\"\n" - " .align 8\n" - " .quad 0b,1b\n" - ".previous\n" + " lhi %0,3\n" + " lr 0,%3\n" + " diag 0,%2,0x250\n" + "0: ipm %0\n" + " srl %0,28\n" + " or %0,1\n" + "1:\n" + ".section __ex_table,\"a\"\n" + " .align 4\n" + " .long 0b,1b\n" + ".previous\n" #endif - : "=&d" (rc) - : "d" (cmd), "d" ((void *) __pa(iob)) - : "0", "1", "cc"); + : "=&d" (rc), "=m" (*(addr_type *) iob) + : "d" (cmd), "d" (iob), "m" (*(addr_type *) iob) + : "0", "1", "cc"); return rc; } +/* Initialize block I/O to DIAG device using the specified blocksize and + * block offset. On success, return zero and set end_block to contain the + * number of blocks on the device minus the specified offset. Return non-zero + * otherwise. */ static __inline__ int -mdsk_init_io(struct dasd_device * device, int blocksize, int offset, int size) +mdsk_init_io(struct dasd_device *device, unsigned int blocksize, + blocknum_t offset, blocknum_t *end_block) { struct dasd_diag_private *private; struct dasd_diag_init_io *iib; @@ -92,14 +124,18 @@ mdsk_init_io(struct dasd_device * device, int blocksize, int offset, int size) iib->dev_nr = _ccw_device_get_device_number(device->cdev); iib->block_size = blocksize; iib->offset = offset; - iib->start_block = 0; - iib->end_block = size; + iib->flaga = DASD_DIAG_FLAGA_DEFAULT; rc = dia250(iib, INIT_BIO); - return rc & 3; + if ((rc & 3) == 0 && end_block) + *end_block = iib->end_block; + + return rc; } +/* Remove block I/O environment for device. Return zero on success, non-zero + * otherwise. */ static __inline__ int mdsk_term_io(struct dasd_device * device) { @@ -112,9 +148,25 @@ mdsk_term_io(struct dasd_device * device) memset(iib, 0, sizeof (struct dasd_diag_init_io)); iib->dev_nr = _ccw_device_get_device_number(device->cdev); rc = dia250(iib, TERM_BIO); - return rc & 3; + return rc; } +/* Error recovery for failed DIAG requests - try to reestablish the DIAG + * environment. */ +static void +dasd_diag_erp(struct dasd_device *device) +{ + int rc; + + mdsk_term_io(device); + rc = mdsk_init_io(device, device->bp_block, 0, NULL); + if (rc) + DEV_MESSAGE(KERN_WARNING, device, "DIAG ERP unsuccessful, " + "rc=%d", rc); +} + +/* Start a given request at the device. Return zero on success, non-zero + * otherwise. */ static int dasd_start_diag(struct dasd_ccw_req * cqr) { @@ -124,32 +176,66 @@ dasd_start_diag(struct dasd_ccw_req * cqr) int rc; device = cqr->device; + if (cqr->retries < 0) { + DEV_MESSAGE(KERN_WARNING, device, "DIAG start_IO: request %p " + "- no retry left)", cqr); + cqr->status = DASD_CQR_FAILED; + return -EIO; + } private = (struct dasd_diag_private *) device->private; dreq = (struct dasd_diag_req *) cqr->data; private->iob.dev_nr = _ccw_device_get_device_number(device->cdev); private->iob.key = 0; - private->iob.flags = 2; /* do asynchronous io */ + private->iob.flags = DASD_DIAG_RWFLAG_ASYNC; private->iob.block_count = dreq->block_count; - private->iob.interrupt_params = (u32)(addr_t) cqr; - private->iob.bio_list = __pa(dreq->bio); + private->iob.interrupt_params = (addr_t) cqr; + private->iob.bio_list = dreq->bio; + private->iob.flaga = DASD_DIAG_FLAGA_DEFAULT; cqr->startclk = get_clock(); + cqr->starttime = jiffies; + cqr->retries--; rc = dia250(&private->iob, RW_BIO); - if (rc > 8) { - DEV_MESSAGE(KERN_WARNING, device, "dia250 returned CC %d", rc); - cqr->status = DASD_CQR_ERROR; - } else if (rc == 0) { + switch (rc) { + case 0: /* Synchronous I/O finished successfully */ + cqr->stopclk = get_clock(); cqr->status = DASD_CQR_DONE; - dasd_schedule_bh(device); - } else { + /* Indicate to calling function that only a dasd_schedule_bh() + and no timer is needed */ + rc = -EACCES; + break; + case 8: /* Asynchronous I/O was started */ cqr->status = DASD_CQR_IN_IO; rc = 0; + break; + default: /* Error condition */ + cqr->status = DASD_CQR_QUEUED; + DEV_MESSAGE(KERN_WARNING, device, "dia250 returned rc=%d", rc); + dasd_diag_erp(device); + rc = -EIO; + break; } return rc; } +/* Terminate given request at the device. */ +static int +dasd_diag_term_IO(struct dasd_ccw_req * cqr) +{ + struct dasd_device *device; + + device = cqr->device; + mdsk_term_io(device); + mdsk_init_io(device, device->bp_block, 0, NULL); + cqr->status = DASD_CQR_CLEAR; + cqr->stopclk = get_clock(); + dasd_schedule_bh(device); + return 0; +} + +/* Handle external interruption. */ static void dasd_ext_handler(struct pt_regs *regs, __u16 code) { @@ -157,25 +243,27 @@ dasd_ext_handler(struct pt_regs *regs, __u16 code) struct dasd_device *device; unsigned long long expires; unsigned long flags; - char status; - int ip; - - /* - * Get the external interruption subcode. VM stores - * this in the 'cpu address' field associated with - * the external interrupt. For diag 250 the subcode - * needs to be 3. - */ - if ((S390_lowcore.cpu_addr & 0xff00) != 0x0300) - return; - status = *((char *) &S390_lowcore.ext_params + 5); - ip = S390_lowcore.ext_params; + u8 int_code, status; + addr_t ip; + int rc; + int_code = *((u8 *) DASD_DIAG_LC_INT_CODE); + status = *((u8 *) DASD_DIAG_LC_INT_STATUS); + switch (int_code) { + case DASD_DIAG_CODE_31BIT: + ip = (addr_t) *((u32 *) DASD_DIAG_LC_INT_PARM_31BIT); + break; + case DASD_DIAG_CODE_64BIT: + ip = (addr_t) *((u64 *) DASD_DIAG_LC_INT_PARM_64BIT); + break; + default: + return; + } if (!ip) { /* no intparm: unsolicited interrupt */ MESSAGE(KERN_DEBUG, "%s", "caught unsolicited interrupt"); return; } - cqr = (struct dasd_ccw_req *)(addr_t) ip; + cqr = (struct dasd_ccw_req *) ip; device = (struct dasd_device *) cqr->device; if (strncmp(device->discipline->ebcname, (char *) &cqr->magic, 4)) { DEV_MESSAGE(KERN_WARNING, device, @@ -188,6 +276,15 @@ dasd_ext_handler(struct pt_regs *regs, __u16 code) /* get irq lock to modify request queue */ spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); + /* Check for a pending clear operation */ + if (cqr->status == DASD_CQR_CLEAR) { + cqr->status = DASD_CQR_QUEUED; + dasd_clear_timer(device); + dasd_schedule_bh(device); + spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); + return; + } + cqr->stopclk = get_clock(); expires = 0; @@ -198,16 +295,22 @@ dasd_ext_handler(struct pt_regs *regs, __u16 code) next = list_entry(device->ccw_queue.next, struct dasd_ccw_req, list); if (next->status == DASD_CQR_QUEUED) { - if (dasd_start_diag(next) == 0) + rc = dasd_start_diag(next); + if (rc == 0) expires = next->expires; - else + else if (rc != -EACCES) DEV_MESSAGE(KERN_WARNING, device, "%s", "Interrupt fastpath " "failed!"); } } - } else - cqr->status = DASD_CQR_FAILED; + } else { + cqr->status = DASD_CQR_QUEUED; + DEV_MESSAGE(KERN_WARNING, device, "interrupt status for " + "request %p was %d (%d retries left)", cqr, status, + cqr->retries); + dasd_diag_erp(device); + } if (expires != 0) dasd_set_timer(device, expires); @@ -218,14 +321,17 @@ dasd_ext_handler(struct pt_regs *regs, __u16 code) spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); } +/* Check whether device can be controlled by DIAG discipline. Return zero on + * success, non-zero otherwise. */ static int dasd_diag_check_device(struct dasd_device *device) { struct dasd_diag_private *private; struct dasd_diag_characteristics *rdc_data; struct dasd_diag_bio bio; - long *label; - int sb, bsize; + struct vtoc_cms_label *label; + blocknum_t end_block; + unsigned int sb, bsize; int rc; private = (struct dasd_diag_private *) device->private; @@ -244,8 +350,11 @@ dasd_diag_check_device(struct dasd_device *device) rdc_data->rdc_len = sizeof (struct dasd_diag_characteristics); rc = diag210((struct diag210 *) rdc_data); - if (rc) + if (rc) { + DEV_MESSAGE(KERN_WARNING, device, "failed to retrieve device " + "information (rc=%d)", rc); return -ENOTSUPP; + } /* Figure out position of label block */ switch (private->rdc_data.vdev_class) { @@ -256,6 +365,8 @@ dasd_diag_check_device(struct dasd_device *device) private->pt_block = 2; break; default: + DEV_MESSAGE(KERN_WARNING, device, "unsupported device class " + "(class=%d)", private->rdc_data.vdev_class); return -ENOTSUPP; } @@ -269,57 +380,77 @@ dasd_diag_check_device(struct dasd_device *device) mdsk_term_io(device); /* figure out blocksize of device */ - label = (long *) get_zeroed_page(GFP_KERNEL); + label = (struct vtoc_cms_label *) get_zeroed_page(GFP_KERNEL); if (label == NULL) { DEV_MESSAGE(KERN_WARNING, device, "%s", "No memory to allocate initialization request"); return -ENOMEM; } + rc = 0; + end_block = 0; /* try all sizes - needed for ECKD devices */ for (bsize = 512; bsize <= PAGE_SIZE; bsize <<= 1) { - mdsk_init_io(device, bsize, 0, 64); + mdsk_init_io(device, bsize, 0, &end_block); memset(&bio, 0, sizeof (struct dasd_diag_bio)); bio.type = MDSK_READ_REQ; bio.block_number = private->pt_block + 1; - bio.buffer = __pa(label); + bio.buffer = label; memset(&private->iob, 0, sizeof (struct dasd_diag_rw_io)); private->iob.dev_nr = rdc_data->dev_nr; private->iob.key = 0; private->iob.flags = 0; /* do synchronous io */ private->iob.block_count = 1; private->iob.interrupt_params = 0; - private->iob.bio_list = __pa(&bio); - if (dia250(&private->iob, RW_BIO) == 0) - break; + private->iob.bio_list = &bio; + private->iob.flaga = DASD_DIAG_FLAGA_DEFAULT; + rc = dia250(&private->iob, RW_BIO); + if (rc == 3) { + DEV_MESSAGE(KERN_WARNING, device, "%s", + "DIAG call failed"); + rc = -EOPNOTSUPP; + goto out; + } mdsk_term_io(device); + if (rc == 0) + break; + } + if (bsize > PAGE_SIZE) { + DEV_MESSAGE(KERN_WARNING, device, "device access failed " + "(rc=%d)", rc); + rc = -EIO; + goto out; } - if (bsize <= PAGE_SIZE && label[0] == 0xc3d4e2f1) { + /* check for label block */ + if (memcmp(label->label_id, DASD_DIAG_CMS1, + sizeof(DASD_DIAG_CMS1)) == 0) { /* get formatted blocksize from label block */ - bsize = (int) label[3]; - device->blocks = label[7]; - device->bp_block = bsize; - device->s2b_shift = 0; /* bits to shift 512 to get a block */ - for (sb = 512; sb < bsize; sb = sb << 1) - device->s2b_shift++; - - DEV_MESSAGE(KERN_INFO, device, - "capacity (%dkB blks): %ldkB", - (device->bp_block >> 10), - (device->blocks << device->s2b_shift) >> 1); - rc = 0; + bsize = (unsigned int) label->block_size; + device->blocks = (unsigned long) label->block_count; + } else + device->blocks = end_block; + device->bp_block = bsize; + device->s2b_shift = 0; /* bits to shift 512 to get a block */ + for (sb = 512; sb < bsize; sb = sb << 1) + device->s2b_shift++; + rc = mdsk_init_io(device, device->bp_block, 0, NULL); + if (rc) { + DEV_MESSAGE(KERN_WARNING, device, "DIAG initialization " + "failed (rc=%d)", rc); + rc = -EIO; } else { - if (bsize > PAGE_SIZE) - DEV_MESSAGE(KERN_WARNING, device, "%s", - "DIAG access failed"); - else - DEV_MESSAGE(KERN_WARNING, device, "%s", - "volume is not CMS formatted"); - rc = -EMEDIUMTYPE; + DEV_MESSAGE(KERN_INFO, device, + "(%ld B/blk): %ldkB", + (unsigned long) device->bp_block, + (unsigned long) (device->blocks << + device->s2b_shift) >> 1); } +out: free_page((long) label); return rc; } +/* Fill in virtual disk geometry for device. Return zero on success, non-zero + * otherwise. */ static int dasd_diag_fill_geometry(struct dasd_device *device, struct hd_geometry *geo) { @@ -349,6 +480,8 @@ dasd_diag_erp_postaction(struct dasd_ccw_req * cqr) return dasd_default_erp_postaction; } +/* Create DASD request from block device request. Return pointer to new + * request on success, ERR_PTR otherwise. */ static struct dasd_ccw_req * dasd_diag_build_cp(struct dasd_device * device, struct request *req) { @@ -358,9 +491,9 @@ dasd_diag_build_cp(struct dasd_device * device, struct request *req) struct bio *bio; struct bio_vec *bv; char *dst; - int count, datasize; + unsigned int count, datasize; sector_t recid, first_rec, last_rec; - unsigned blksize, off; + unsigned int blksize, off; unsigned char rw_cmd; int i; @@ -406,20 +539,25 @@ dasd_diag_build_cp(struct dasd_device * device, struct request *req) memset(dbio, 0, sizeof (struct dasd_diag_bio)); dbio->type = rw_cmd; dbio->block_number = recid + 1; - dbio->buffer = __pa(dst); + dbio->buffer = dst; dbio++; dst += blksize; recid++; } } } + cqr->retries = DIAG_MAX_RETRIES; cqr->buildclk = get_clock(); + if (req->flags & REQ_FAILFAST) + set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags); cqr->device = device; - cqr->expires = 50 * HZ; /* 50 seconds */ + cqr->expires = DIAG_TIMEOUT; cqr->status = DASD_CQR_FILLED; return cqr; } +/* Release DASD request. Return non-zero if request was successful, zero + * otherwise. */ static int dasd_diag_free_cp(struct dasd_ccw_req *cqr, struct request *req) { @@ -430,6 +568,7 @@ dasd_diag_free_cp(struct dasd_ccw_req *cqr, struct request *req) return status; } +/* Fill in IOCTL data for device. */ static int dasd_diag_fill_info(struct dasd_device * device, struct dasd_information2_t * info) @@ -437,7 +576,7 @@ dasd_diag_fill_info(struct dasd_device * device, struct dasd_diag_private *private; private = (struct dasd_diag_private *) device->private; - info->label_block = private->pt_block; + info->label_block = (unsigned int) private->pt_block; info->FBA_layout = 1; info->format = DASD_FORMAT_LDL; info->characteristics_size = sizeof (struct dasd_diag_characteristics); @@ -456,26 +595,15 @@ dasd_diag_dump_sense(struct dasd_device *device, struct dasd_ccw_req * req, "dump sense not available for DIAG data"); } -/* - * max_blocks is dependent on the amount of storage that is available - * in the static io buffer for each device. Currently each device has - * 8192 bytes (=2 pages). dasd diag is only relevant for 31 bit. - * The struct dasd_ccw_req has 96 bytes, the struct dasd_diag_req has - * 8 bytes and the struct dasd_diag_bio for each block has 16 bytes. - * That makes: - * (8192 - 96 - 8) / 16 = 505.5 blocks at maximum. - * We want to fit two into the available memory so that we can immediately - * start the next request if one finishes off. That makes 252.75 blocks - * for one request. Give a little safety and the result is 240. - */ struct dasd_discipline dasd_diag_discipline = { .owner = THIS_MODULE, .name = "DIAG", .ebcname = "DIAG", - .max_blocks = 240, + .max_blocks = DIAG_MAX_BLOCKS, .check_device = dasd_diag_check_device, .fill_geometry = dasd_diag_fill_geometry, .start_IO = dasd_start_diag, + .term_IO = dasd_diag_term_IO, .examine_error = dasd_diag_examine_error, .erp_action = dasd_diag_erp_action, .erp_postaction = dasd_diag_erp_postaction, @@ -493,7 +621,7 @@ dasd_diag_init(void) "Machine is not VM: %s " "discipline not initializing", dasd_diag_discipline.name); - return -EINVAL; + return -ENODEV; } ASCEBC(dasd_diag_discipline.ebcname, 4); @@ -506,13 +634,6 @@ dasd_diag_init(void) static void __exit dasd_diag_cleanup(void) { - if (!MACHINE_IS_VM) { - MESSAGE_LOG(KERN_INFO, - "Machine is not VM: %s " - "discipline not cleaned", - dasd_diag_discipline.name); - return; - } unregister_external_interrupt(0x2603, dasd_ext_handler); ctl_clear_bit(0, 9); dasd_diag_discipline_pointer = NULL; @@ -520,22 +641,3 @@ dasd_diag_cleanup(void) module_init(dasd_diag_init); module_exit(dasd_diag_cleanup); - -/* - * Overrides for Emacs so that we follow Linus's tabbing style. - * Emacs will notice this stuff at the end of the file and automatically - * adjust the settings for this buffer only. This must remain at the end - * of the file. - * --------------------------------------------------------------------------- - * Local variables: - * c-indent-level: 4 - * c-brace-imaginary-offset: 0 - * c-brace-offset: -4 - * c-argdecl-indent: 4 - * c-label-offset: -4 - * c-continued-statement-offset: 4 - * c-continued-brace-offset: 0 - * indent-tabs-mode: 1 - * tab-width: 8 - * End: - */