dasd_diag.c
上传用户:lgb322
上传日期:2013-02-24
资源大小:30529k
文件大小:15k
- /*
- * File...........: linux/drivers/s390/block/dasd_diag.c
- * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
- * Based on.......: linux/drivers/s390/block/mdisk.c
- * ...............: by Hartmunt Penner <hpenner@de.ibm.com>
- * Bugreports.to..: <Linux390@de.ibm.com>
- * (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999,2000
- * History of changes
- * 07/13/00 Added fixup sections for diagnoses ans saved some registers
- * 07/14/00 fixed constraints in newly generated inline asm
- * 10/05/00 adapted to 'new' DASD driver
- * fixed return codes of dia250()
- * fixed partition handling and HDIO_GETGEO
- */
- #include <linux/config.h>
- #include <linux/stddef.h>
- #include <linux/kernel.h>
- #include <asm/debug.h>
- #include <linux/slab.h>
- #include <linux/hdreg.h> /* HDIO_GETGEO */
- #include <linux/blk.h>
- #include <asm/ccwcache.h>
- #include <asm/dasd.h>
- #include <asm/ebcdic.h>
- #include <asm/io.h>
- #include <asm/irq.h>
- #include <asm/s390dyn.h>
- #include "dasd_int.h"
- #include "dasd_diag.h"
- #ifdef PRINTK_HEADER
- #undef PRINTK_HEADER
- #endif /* PRINTK_HEADER */
- #define PRINTK_HEADER DASD_NAME"(diag):"
- dasd_discipline_t dasd_diag_discipline;
- typedef struct
- dasd_diag_private_t {
- dasd_diag_characteristics_t rdc_data;
- diag_rw_io_t iob;
- diag_init_io_t iib;
- unsigned long *label;
- } dasd_diag_private_t;
- static __inline__ int
- dia210 (void *devchar)
- {
- int rc;
- __asm__ __volatile__ (" diag %1,0,0x210n"
- "0: ipm %0n"
- " srl %0,28n"
- "1:n"
- ".section .fixup,"ax"n"
- "2: lhi %0,3n"
- " bras 1,3fn"
- " .long 1bn"
- "3: l 1,0(1)n"
- " br 1n"
- ".previousn"
- ".section __ex_table,"a"n"
- " .align 4n"
- " .long 0b,2bn" ".previousn":"=d" (rc)
- :"d" ((void *) __pa (devchar))
- :"1");
- return rc;
- }
- static __inline__ int
- dia250 (void *iob, int cmd)
- {
- __asm__ __volatile__ (" lr 0,%1n"
- " diag 0,%0,0x250n"
- "0: ipm %0n"
- " srl %0,28n"
- " or %0,1n"
- "1:n"
- ".section .fixup,"ax"n"
- "2: lhi %0,3n"
- " bras 1,3fn"
- " .long 1bn"
- "3: l 1,0(1)n"
- " br 1n"
- ".previousn"
- ".section __ex_table,"a"n"
- " .align 4n"
- " .long 0b,2bn" ".previousn":"+d" (cmd)
- :"d" ((void *) __pa (iob))
- :"0", "1", "cc");
- return cmd;
- }
- static __inline__ int
- mdsk_init_io (dasd_device_t * device, int blocksize, int offset, int size)
- {
- dasd_diag_private_t *private = (dasd_diag_private_t *) device->private;
- diag_init_io_t *iib = &private->iib;
- int rc;
- memset (iib, 0, sizeof (diag_init_io_t));
- iib->dev_nr = device->devinfo.devno;
- iib->block_size = blocksize;
- iib->offset = offset;
- iib->start_block = 0;
- iib->end_block = size;
- rc = dia250 (iib, INIT_BIO);
- return rc & 3;
- }
- static __inline__ int
- mdsk_term_io (dasd_device_t * device)
- {
- dasd_diag_private_t *private = (dasd_diag_private_t *) device->private;
- diag_init_io_t *iib = &private->iib;
- int rc;
- memset (iib, 0, sizeof (diag_init_io_t));
- iib->dev_nr = device->devinfo.devno;
- rc = dia250 (iib, TERM_BIO);
- return rc & 3;
- }
- int
- dasd_start_diag (ccw_req_t * cqr)
- {
- int rc;
- dasd_device_t *device = cqr->device;
- dasd_diag_private_t *private;
- diag_rw_io_t *iob;
- private = (dasd_diag_private_t *) device->private;
- iob = &private->iob;
- iob->dev_nr = device->devinfo.devno;
- iob->key = 0;
- iob->flags = 2;
- iob->block_count = cqr->cplength >> 1;
- iob->interrupt_params = (u32) cqr;
- iob->bio_list = __pa (cqr->cpaddr);
- asm volatile ("STCK %0":"=m" (cqr->startclk));
- rc = dia250 (iob, RW_BIO);
- if (rc > 8) {
- PRINT_WARN ("dia250 returned CC %dn", rc);
- check_then_set (&cqr->status,
- CQR_STATUS_QUEUED, CQR_STATUS_ERROR);
- } else if (rc == 0) {
- check_then_set (&cqr->status,
- CQR_STATUS_QUEUED, CQR_STATUS_DONE);
- dasd_schedule_bh (device);
- } else {
- check_then_set (&cqr->status,
- CQR_STATUS_QUEUED, CQR_STATUS_IN_IO);
- rc = 0;
- }
- return rc;
- }
- void
- dasd_ext_handler (struct pt_regs *regs, __u16 code)
- {
- int cpu = smp_processor_id();
- ccw_req_t *cqr;
- int ip = S390_lowcore.ext_params;
- char status = *((char *) &S390_lowcore.ext_params + 5);
- dasd_device_t *device;
- int done_fast_io = 0;
- int devno;
- unsigned long flags;
- irq_enter(cpu, -1);
- if (!ip) { /* no intparm: unsolicited interrupt */
- printk (KERN_WARNING PRINTK_HEADER
- "caught unsolicited interruptn");
- irq_exit(cpu, -1);
- return;
- }
- if (ip & 0x80000001) {
- printk (KERN_WARNING PRINTK_HEADER
- "caught spurious interrupt with parm %08xn", ip);
- irq_exit(cpu, -1);
- return;
- }
- cqr = (ccw_req_t *) ip;
- device = (dasd_device_t *) cqr->device;
- devno = device->devinfo.devno;
- if (device == NULL) {
- printk (KERN_WARNING PRINTK_HEADER
- " INT on devno 0x%04X = /dev/%s (%d:%d)"
- " belongs to NULL devicen",
- devno, device->name, MAJOR (device->kdev),
- MINOR (device->kdev));
- }
- if (strncmp (device->discipline->ebcname, (char *) &cqr->magic, 4)) {
- printk (KERN_WARNING PRINTK_HEADER
- "0x%04X : /dev/%s (%d:%d)"
- " magic number of ccw_req_t 0x%08X doesn't match"
- " discipline 0x%08Xn",
- devno, device->name,
- MAJOR (device->kdev), MINOR (device->kdev),
- cqr->magic, *(int *) (&device->discipline->name));
- irq_exit(cpu, -1);
- return;
- }
- /* get irq lock to modify request queue */
- s390irq_spin_lock_irqsave (device->devinfo.irq,
- flags);
- asm volatile ("STCK %0":"=m" (cqr->stopclk));
- switch (status) {
- case 0x00:
- check_then_set (&cqr->status,
- CQR_STATUS_IN_IO, CQR_STATUS_DONE);
- if (cqr->next && (cqr->next->status == CQR_STATUS_QUEUED)) {
- if (dasd_start_diag (cqr->next) == 0) {
- done_fast_io = 1;
- }
- }
- break;
- case 0x01:
- case 0x02:
- case 0x03:
- default:
- check_then_set (&cqr->status,
- CQR_STATUS_IN_IO, CQR_STATUS_FAILED);
- break;
- }
- s390irq_spin_unlock_irqrestore (device->devinfo.irq,
- flags);
- wake_up (&device->wait_q);
- dasd_schedule_bh (device);
- irq_exit(cpu, -1);
- }
- static int
- dasd_diag_check_characteristics (struct dasd_device_t *device)
- {
- int rc = 0;
- int bsize;
- int label_block;
- dasd_diag_private_t *private;
- dasd_diag_characteristics_t *rdc_data;
- ccw_req_t *cqr;
- long *label;
- int sb;
- if (device == NULL) {
- printk (KERN_WARNING PRINTK_HEADER
- "Null device pointer passed to characteristics checkern");
- return -ENODEV;
- }
- device->private = kmalloc (sizeof (dasd_diag_private_t), GFP_KERNEL);
- if (device->private == NULL) {
- printk (KERN_WARNING PRINTK_HEADER
- "memory allocation failed for private datan");
- rc = -ENOMEM;
- goto fail;
- }
- private = (dasd_diag_private_t *) device->private;
- rdc_data = (void *) &(private->rdc_data);
- rdc_data->dev_nr = device->devinfo.devno;
- rdc_data->rdc_len = sizeof (dasd_diag_characteristics_t);
- rc = dia210 (rdc_data);
- if ( rc != 0) {
- goto fail;
- }
- if (rdc_data->vdev_class != DEV_CLASS_FBA &&
- rdc_data->vdev_class != DEV_CLASS_ECKD &&
- rdc_data->vdev_class != DEV_CLASS_CKD) {
- rc = -ENOTSUPP;
- goto fail;
- }
- #if 0
- printk (KERN_INFO PRINTK_HEADER
- "%04X: %04X on real %04X/%02Xn",
- rdc_data->dev_nr,
- rdc_data->vdev_type, rdc_data->rdev_type, rdc_data->rdev_model);
- #endif
- /* Figure out position of label block */
- if (private->rdc_data.vdev_class == DEV_CLASS_FBA) {
- device->sizes.pt_block = 1;
- } else if (private->rdc_data.vdev_class == DEV_CLASS_ECKD ||
- private->rdc_data.vdev_class == DEV_CLASS_CKD) {
- device->sizes.pt_block = 2;
- } else {
- BUG();
- }
- private->label = (long *) get_free_page (GFP_KERNEL);
- label = private->label;
- mdsk_term_io (device); /* first terminate all outstanding operations */
- /* figure out blocksize of device */
- for (bsize = 512; bsize <= PAGE_SIZE; bsize <<= 1) {
- diag_bio_t *bio;
- diag_rw_io_t *iob = &private->iob;
- rc = mdsk_init_io (device, bsize, 0, 64);
- if (rc > 4) {
- continue;
- }
- cqr = dasd_alloc_request (dasd_diag_discipline.name,
- sizeof (diag_bio_t) / sizeof (ccw1_t),
- 0, device);
- if (cqr == NULL) {
- printk (KERN_WARNING PRINTK_HEADER
- "No memory to allocate initialization requestn");
- free_page ((long) private->label);
- rc = -ENOMEM;
- goto fail;
- }
- bio = (diag_bio_t *) (cqr->cpaddr);
- memset (bio, 0, sizeof (diag_bio_t));
- bio->type = MDSK_READ_REQ;
- bio->block_number = device->sizes.pt_block + 1;
- bio->buffer = __pa (private->label);
- cqr->device = device;
- cqr->status = CQR_STATUS_FILLED;
- memset (iob, 0, sizeof (diag_rw_io_t));
- iob->dev_nr = rdc_data->dev_nr;
- iob->block_count = 1;
- iob->interrupt_params = (u32) cqr;
- iob->bio_list = __pa (bio);
- rc = dia250 (iob, RW_BIO);
- if (rc == 0) {
- if (label[3] != bsize ||
- label[0] != 0xc3d4e2f1 || /* != CMS1 */
- label[13] == 0 ){
- rc = -EMEDIUMTYPE;
- goto fail;
- }
- break;
- }
- mdsk_term_io (device);
- }
- if (bsize > PAGE_SIZE) {
- rc = -EMEDIUMTYPE;
- goto fail;
- }
- device->sizes.blocks = label[7];
- device->sizes.bp_block = bsize;
- device->sizes.s2b_shift = 0; /* bits to shift 512 to get a block */
- for (sb = 512; sb < bsize; sb = sb << 1)
- device->sizes.s2b_shift++;
- printk (KERN_INFO PRINTK_HEADER
- "/dev/%s (%04X): capacity (%dkB blks): %ldkBn",
- device->name, device->devinfo.devno,
- (device->sizes.bp_block >> 10),
- (device->sizes.blocks << device->sizes.s2b_shift) >> 1);
- free_page ((long) private->label);
- rc = 0;
- goto out;
- fail:
- if ( rc ) {
- kfree (device->private);
- device->private = NULL;
- }
- out:
- return rc;
- }
- static int
- dasd_diag_fill_geometry (struct dasd_device_t *device, struct hd_geometry *geo)
- {
- int rc = 0;
- dasd_diag_private_t *private = (dasd_diag_private_t *) device->private;
- unsigned long sectors = device->sizes.blocks << device->sizes.s2b_shift;
- unsigned long tracks = sectors >> 6;
- unsigned long trk_rem = sectors & ((1 << 6) - 1); /* 64k per track */
- unsigned long cyls = tracks >> 4;
- unsigned long cyls_rem = tracks & ((1 << 4) - 1); /* 16 head per cyl */
- switch (device->sizes.bp_block) {
- case 512:
- case 1024:
- case 2048:
- case 4096:
- break;
- default:
- return -EINVAL;
- }
- geo->cylinders = cyls;
- geo->heads = 16;
- geo->sectors = 128 >> device->sizes.s2b_shift;
- return rc;
- }
- static dasd_era_t
- dasd_diag_examine_error (ccw_req_t * cqr, devstat_t * stat)
- {
- return dasd_era_fatal;
- }
- static ccw_req_t *
- dasd_diag_build_cp_from_req (dasd_device_t * device, struct request *req)
- {
- ccw_req_t *rw_cp = NULL;
- struct buffer_head *bh;
- int rw_cmd;
- int noblk = req->nr_sectors >> device->sizes.s2b_shift;
- int byt_per_blk = device->sizes.bp_block;
- int block;
- diag_bio_t *bio;
- int bhct;
- long size;
- if (!noblk) {
- PRINT_ERR ("No blocks to read/write...returningn");
- return NULL;
- }
- if (req->cmd == READ) {
- rw_cmd = MDSK_READ_REQ;
- } else if (req->cmd == WRITE) {
- rw_cmd = MDSK_WRITE_REQ;
- }
- bhct = 0;
- for (bh = req->bh; bh; bh = bh->b_reqnext) {
- if (bh->b_size < byt_per_blk)
- BUG();
- bhct += bh->b_size >> (device->sizes.s2b_shift+9);
- }
- /* Build the request */
- rw_cp = dasd_alloc_request (dasd_diag_discipline.name, bhct << 1, 0, device);
- if (!rw_cp) {
- return NULL;
- }
- bio = (diag_bio_t *) (rw_cp->cpaddr);
- block = req->sector >> device->sizes.s2b_shift;
- for (bh = req->bh; bh; bh = bh->b_reqnext) {
- memset (bio, 0, sizeof (diag_bio_t));
- for (size = 0; size < bh->b_size; size += byt_per_blk) {
- bio->type = rw_cmd;
- bio->block_number = block + 1;
- bio->buffer = __pa (bh->b_data + size);
- bio++;
- block++;
- }
- }
- asm volatile ("STCK %0":"=m" (rw_cp->buildclk));
- rw_cp->device = device;
- rw_cp->expires = 50 * TOD_SEC; /* 50 seconds */
- rw_cp->req = req;
- check_then_set (&rw_cp->status, CQR_STATUS_EMPTY, CQR_STATUS_FILLED);
- return rw_cp;
- }
- static int
- dasd_diag_fill_info (dasd_device_t * device, dasd_information_t * info)
- {
- int rc = 0;
- info->FBA_layout = 1;
- info->characteristics_size = sizeof (dasd_diag_characteristics_t);
- memcpy (info->characteristics,
- &((dasd_diag_private_t *) device->private)->rdc_data,
- sizeof (dasd_diag_characteristics_t));
- info->confdata_size = 0;
- return rc;
- }
- static char *
- dasd_diag_dump_sense (struct dasd_device_t *device, ccw_req_t * req)
- {
- char *page = (char *) get_free_page (GFP_KERNEL);
- int len;
- if (page == NULL) {
- return NULL;
- }
- len = sprintf (page, KERN_WARNING PRINTK_HEADER
- "device %04X on irq %d: I/O status report:n",
- device->devinfo.devno, device->devinfo.irq);
- return page;
- }
- dasd_discipline_t dasd_diag_discipline = {
- owner: THIS_MODULE,
- name:"DIAG",
- ebcname:"DIAG",
- max_blocks:PAGE_SIZE / sizeof (diag_bio_t),
- check_characteristics:dasd_diag_check_characteristics,
- fill_geometry:dasd_diag_fill_geometry,
- start_IO:dasd_start_diag,
- examine_error:dasd_diag_examine_error,
- build_cp_from_req:dasd_diag_build_cp_from_req,
- dump_sense:dasd_diag_dump_sense,
- int_handler:dasd_ext_handler,
- fill_info:dasd_diag_fill_info,
- };
- int
- dasd_diag_init (void)
- {
- int rc = 0;
- if (MACHINE_IS_VM) {
- printk (KERN_INFO PRINTK_HEADER
- "%s discipline initializingn",
- dasd_diag_discipline.name);
- ASCEBC (dasd_diag_discipline.ebcname, 4);
- ctl_set_bit (0, 9);
- register_external_interrupt (0x2603, dasd_ext_handler);
- dasd_discipline_add (&dasd_diag_discipline);
- } else {
- printk (KERN_INFO PRINTK_HEADER
- "Machine is not VM: %s discipline not initializingn",
- dasd_diag_discipline.name);
- rc = -EINVAL;
- }
- return rc;
- }
- void
- dasd_diag_cleanup (void)
- {
- if (MACHINE_IS_VM) {
- printk (KERN_INFO PRINTK_HEADER
- "%s discipline cleaning upn",
- dasd_diag_discipline.name);
- dasd_discipline_del (&dasd_diag_discipline);
- unregister_external_interrupt (0x2603, dasd_ext_handler);
- ctl_clear_bit (0, 9);
- } else {
- printk (KERN_INFO PRINTK_HEADER
- "Machine is not VM: %s discipline not initializingn",
- dasd_diag_discipline.name);
- }
- }
- #ifdef MODULE
- int
- init_module (void)
- {
- int rc = 0;
- rc = dasd_diag_init ();
- return rc;
- }
- void
- cleanup_module (void)
- {
- dasd_diag_cleanup ();
- return;
- }
- #endif
- /*
- * 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: nil
- * tab-width: 8
- * End:
- */