mirror of https://gitee.com/openkylin/linux.git
625 lines
17 KiB
C
625 lines
17 KiB
C
/*
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* File...........: linux/drivers/s390/block/dasd_diag.c
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* Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
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* Based on.......: linux/drivers/s390/block/mdisk.c
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* ...............: by Hartmunt Penner <hpenner@de.ibm.com>
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* Bugreports.to..: <Linux390@de.ibm.com>
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* (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999,2000
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*
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*/
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#include <linux/stddef.h>
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/hdreg.h>
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#include <linux/bio.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/jiffies.h>
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#include <asm/dasd.h>
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#include <asm/debug.h>
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#include <asm/ebcdic.h>
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#include <asm/io.h>
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#include <asm/s390_ext.h>
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#include <asm/todclk.h>
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#include <asm/vtoc.h>
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#include "dasd_int.h"
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#include "dasd_diag.h"
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#define PRINTK_HEADER "dasd(diag):"
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MODULE_LICENSE("GPL");
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/* The maximum number of blocks per request (max_blocks) is dependent on the
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* amount of storage that is available in the static I/O buffer for each
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* device. Currently each device gets 2 pages. We want to fit two requests
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* into the available memory so that we can immediately start the next if one
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* finishes. */
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#define DIAG_MAX_BLOCKS (((2 * PAGE_SIZE - sizeof(struct dasd_ccw_req) - \
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sizeof(struct dasd_diag_req)) / \
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sizeof(struct dasd_diag_bio)) / 2)
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#define DIAG_MAX_RETRIES 32
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#define DIAG_TIMEOUT 50 * HZ
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static struct dasd_discipline dasd_diag_discipline;
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struct dasd_diag_private {
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struct dasd_diag_characteristics rdc_data;
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struct dasd_diag_rw_io iob;
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struct dasd_diag_init_io iib;
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blocknum_t pt_block;
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};
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struct dasd_diag_req {
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unsigned int block_count;
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struct dasd_diag_bio bio[0];
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};
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static const u8 DASD_DIAG_CMS1[] = { 0xc3, 0xd4, 0xe2, 0xf1 };/* EBCDIC CMS1 */
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/* Perform DIAG250 call with block I/O parameter list iob (input and output)
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* and function code cmd.
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* In case of an exception return 3. Otherwise return result of bitwise OR of
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* resulting condition code and DIAG return code. */
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static inline int dia250(void *iob, int cmd)
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{
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register unsigned long reg0 asm ("0") = (unsigned long) iob;
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typedef union {
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struct dasd_diag_init_io init_io;
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struct dasd_diag_rw_io rw_io;
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} addr_type;
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int rc;
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rc = 3;
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asm volatile(
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" diag 0,%2,0x250\n"
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"0: ipm %0\n"
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" srl %0,28\n"
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" or %0,1\n"
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"1:\n"
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EX_TABLE(0b,1b)
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: "+d" (rc), "=m" (*(addr_type *) iob)
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: "d" (cmd), "d" (reg0), "m" (*(addr_type *) iob)
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: "1", "cc");
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return rc;
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}
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/* Initialize block I/O to DIAG device using the specified blocksize and
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* block offset. On success, return zero and set end_block to contain the
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* number of blocks on the device minus the specified offset. Return non-zero
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* otherwise. */
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static inline int
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mdsk_init_io(struct dasd_device *device, unsigned int blocksize,
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blocknum_t offset, blocknum_t *end_block)
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{
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struct dasd_diag_private *private;
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struct dasd_diag_init_io *iib;
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int rc;
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private = (struct dasd_diag_private *) device->private;
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iib = &private->iib;
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memset(iib, 0, sizeof (struct dasd_diag_init_io));
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iib->dev_nr = _ccw_device_get_device_number(device->cdev);
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iib->block_size = blocksize;
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iib->offset = offset;
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iib->flaga = DASD_DIAG_FLAGA_DEFAULT;
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rc = dia250(iib, INIT_BIO);
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if ((rc & 3) == 0 && end_block)
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*end_block = iib->end_block;
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return rc;
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}
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/* Remove block I/O environment for device. Return zero on success, non-zero
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* otherwise. */
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static inline int
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mdsk_term_io(struct dasd_device * device)
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{
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struct dasd_diag_private *private;
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struct dasd_diag_init_io *iib;
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int rc;
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private = (struct dasd_diag_private *) device->private;
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iib = &private->iib;
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memset(iib, 0, sizeof (struct dasd_diag_init_io));
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iib->dev_nr = _ccw_device_get_device_number(device->cdev);
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rc = dia250(iib, TERM_BIO);
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return rc;
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}
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/* Error recovery for failed DIAG requests - try to reestablish the DIAG
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* environment. */
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static void
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dasd_diag_erp(struct dasd_device *device)
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{
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int rc;
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mdsk_term_io(device);
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rc = mdsk_init_io(device, device->bp_block, 0, NULL);
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if (rc)
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DEV_MESSAGE(KERN_WARNING, device, "DIAG ERP unsuccessful, "
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"rc=%d", rc);
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}
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/* Start a given request at the device. Return zero on success, non-zero
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* otherwise. */
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static int
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dasd_start_diag(struct dasd_ccw_req * cqr)
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{
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struct dasd_device *device;
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struct dasd_diag_private *private;
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struct dasd_diag_req *dreq;
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int rc;
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device = cqr->device;
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if (cqr->retries < 0) {
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DEV_MESSAGE(KERN_WARNING, device, "DIAG start_IO: request %p "
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"- no retry left)", cqr);
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cqr->status = DASD_CQR_FAILED;
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return -EIO;
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}
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private = (struct dasd_diag_private *) device->private;
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dreq = (struct dasd_diag_req *) cqr->data;
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private->iob.dev_nr = _ccw_device_get_device_number(device->cdev);
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private->iob.key = 0;
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private->iob.flags = DASD_DIAG_RWFLAG_ASYNC;
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private->iob.block_count = dreq->block_count;
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private->iob.interrupt_params = (addr_t) cqr;
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private->iob.bio_list = dreq->bio;
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private->iob.flaga = DASD_DIAG_FLAGA_DEFAULT;
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cqr->startclk = get_clock();
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cqr->starttime = jiffies;
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cqr->retries--;
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rc = dia250(&private->iob, RW_BIO);
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switch (rc) {
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case 0: /* Synchronous I/O finished successfully */
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cqr->stopclk = get_clock();
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cqr->status = DASD_CQR_DONE;
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/* Indicate to calling function that only a dasd_schedule_bh()
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and no timer is needed */
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rc = -EACCES;
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break;
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case 8: /* Asynchronous I/O was started */
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cqr->status = DASD_CQR_IN_IO;
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rc = 0;
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break;
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default: /* Error condition */
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cqr->status = DASD_CQR_QUEUED;
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DEV_MESSAGE(KERN_WARNING, device, "dia250 returned rc=%d", rc);
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dasd_diag_erp(device);
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rc = -EIO;
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break;
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}
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return rc;
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}
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/* Terminate given request at the device. */
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static int
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dasd_diag_term_IO(struct dasd_ccw_req * cqr)
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{
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struct dasd_device *device;
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device = cqr->device;
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mdsk_term_io(device);
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mdsk_init_io(device, device->bp_block, 0, NULL);
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cqr->status = DASD_CQR_CLEAR;
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cqr->stopclk = get_clock();
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dasd_schedule_bh(device);
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return 0;
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}
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/* Handle external interruption. */
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static void
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dasd_ext_handler(__u16 code)
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{
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struct dasd_ccw_req *cqr, *next;
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struct dasd_device *device;
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unsigned long long expires;
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unsigned long flags;
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u8 int_code, status;
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addr_t ip;
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int rc;
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int_code = *((u8 *) DASD_DIAG_LC_INT_CODE);
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status = *((u8 *) DASD_DIAG_LC_INT_STATUS);
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switch (int_code) {
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case DASD_DIAG_CODE_31BIT:
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ip = (addr_t) *((u32 *) DASD_DIAG_LC_INT_PARM_31BIT);
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break;
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case DASD_DIAG_CODE_64BIT:
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ip = (addr_t) *((u64 *) DASD_DIAG_LC_INT_PARM_64BIT);
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break;
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default:
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return;
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}
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if (!ip) { /* no intparm: unsolicited interrupt */
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MESSAGE(KERN_DEBUG, "%s", "caught unsolicited interrupt");
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return;
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}
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cqr = (struct dasd_ccw_req *) ip;
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device = (struct dasd_device *) cqr->device;
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if (strncmp(device->discipline->ebcname, (char *) &cqr->magic, 4)) {
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DEV_MESSAGE(KERN_WARNING, device,
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" magic number of dasd_ccw_req 0x%08X doesn't"
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" match discipline 0x%08X",
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cqr->magic, *(int *) (&device->discipline->name));
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return;
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}
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/* get irq lock to modify request queue */
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spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
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/* Check for a pending clear operation */
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if (cqr->status == DASD_CQR_CLEAR) {
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cqr->status = DASD_CQR_QUEUED;
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dasd_clear_timer(device);
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dasd_schedule_bh(device);
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spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
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return;
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}
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cqr->stopclk = get_clock();
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expires = 0;
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if (status == 0) {
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cqr->status = DASD_CQR_DONE;
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/* Start first request on queue if possible -> fast_io. */
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if (!list_empty(&device->ccw_queue)) {
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next = list_entry(device->ccw_queue.next,
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struct dasd_ccw_req, list);
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if (next->status == DASD_CQR_QUEUED) {
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rc = dasd_start_diag(next);
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if (rc == 0)
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expires = next->expires;
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else if (rc != -EACCES)
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DEV_MESSAGE(KERN_WARNING, device, "%s",
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"Interrupt fastpath "
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"failed!");
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}
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}
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} else {
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cqr->status = DASD_CQR_QUEUED;
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DEV_MESSAGE(KERN_WARNING, device, "interrupt status for "
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"request %p was %d (%d retries left)", cqr, status,
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cqr->retries);
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dasd_diag_erp(device);
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}
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if (expires != 0)
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dasd_set_timer(device, expires);
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else
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dasd_clear_timer(device);
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dasd_schedule_bh(device);
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spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
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}
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/* Check whether device can be controlled by DIAG discipline. Return zero on
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* success, non-zero otherwise. */
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static int
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dasd_diag_check_device(struct dasd_device *device)
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{
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struct dasd_diag_private *private;
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struct dasd_diag_characteristics *rdc_data;
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struct dasd_diag_bio bio;
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struct vtoc_cms_label *label;
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blocknum_t end_block;
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unsigned int sb, bsize;
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int rc;
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private = (struct dasd_diag_private *) device->private;
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if (private == NULL) {
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private = kzalloc(sizeof(struct dasd_diag_private),GFP_KERNEL);
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if (private == NULL) {
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DEV_MESSAGE(KERN_WARNING, device, "%s",
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"memory allocation failed for private data");
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return -ENOMEM;
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}
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device->private = (void *) private;
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}
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/* Read Device Characteristics */
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rdc_data = (void *) &(private->rdc_data);
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rdc_data->dev_nr = _ccw_device_get_device_number(device->cdev);
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rdc_data->rdc_len = sizeof (struct dasd_diag_characteristics);
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rc = diag210((struct diag210 *) rdc_data);
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if (rc) {
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DEV_MESSAGE(KERN_WARNING, device, "failed to retrieve device "
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"information (rc=%d)", rc);
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return -ENOTSUPP;
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}
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/* Figure out position of label block */
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switch (private->rdc_data.vdev_class) {
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case DEV_CLASS_FBA:
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private->pt_block = 1;
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break;
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case DEV_CLASS_ECKD:
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private->pt_block = 2;
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break;
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default:
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DEV_MESSAGE(KERN_WARNING, device, "unsupported device class "
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"(class=%d)", private->rdc_data.vdev_class);
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return -ENOTSUPP;
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}
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DBF_DEV_EVENT(DBF_INFO, device,
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"%04X: %04X on real %04X/%02X",
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rdc_data->dev_nr,
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rdc_data->vdev_type,
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rdc_data->rdev_type, rdc_data->rdev_model);
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/* terminate all outstanding operations */
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mdsk_term_io(device);
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/* figure out blocksize of device */
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label = (struct vtoc_cms_label *) get_zeroed_page(GFP_KERNEL);
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if (label == NULL) {
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DEV_MESSAGE(KERN_WARNING, device, "%s",
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"No memory to allocate initialization request");
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return -ENOMEM;
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}
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rc = 0;
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end_block = 0;
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/* try all sizes - needed for ECKD devices */
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for (bsize = 512; bsize <= PAGE_SIZE; bsize <<= 1) {
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mdsk_init_io(device, bsize, 0, &end_block);
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memset(&bio, 0, sizeof (struct dasd_diag_bio));
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bio.type = MDSK_READ_REQ;
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bio.block_number = private->pt_block + 1;
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bio.buffer = label;
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memset(&private->iob, 0, sizeof (struct dasd_diag_rw_io));
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private->iob.dev_nr = rdc_data->dev_nr;
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private->iob.key = 0;
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private->iob.flags = 0; /* do synchronous io */
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private->iob.block_count = 1;
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private->iob.interrupt_params = 0;
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private->iob.bio_list = &bio;
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private->iob.flaga = DASD_DIAG_FLAGA_DEFAULT;
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rc = dia250(&private->iob, RW_BIO);
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if (rc == 3) {
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DEV_MESSAGE(KERN_WARNING, device, "%s",
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"DIAG call failed");
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rc = -EOPNOTSUPP;
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goto out;
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}
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mdsk_term_io(device);
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if (rc == 0)
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break;
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}
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if (bsize > PAGE_SIZE) {
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DEV_MESSAGE(KERN_WARNING, device, "device access failed "
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"(rc=%d)", rc);
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rc = -EIO;
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goto out;
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}
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/* check for label block */
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if (memcmp(label->label_id, DASD_DIAG_CMS1,
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sizeof(DASD_DIAG_CMS1)) == 0) {
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/* get formatted blocksize from label block */
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bsize = (unsigned int) label->block_size;
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device->blocks = (unsigned long) label->block_count;
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} else
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device->blocks = end_block;
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device->bp_block = bsize;
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device->s2b_shift = 0; /* bits to shift 512 to get a block */
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for (sb = 512; sb < bsize; sb = sb << 1)
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device->s2b_shift++;
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rc = mdsk_init_io(device, device->bp_block, 0, NULL);
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if (rc) {
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DEV_MESSAGE(KERN_WARNING, device, "DIAG initialization "
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"failed (rc=%d)", rc);
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rc = -EIO;
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} else {
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DEV_MESSAGE(KERN_INFO, device,
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"(%ld B/blk): %ldkB",
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(unsigned long) device->bp_block,
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(unsigned long) (device->blocks <<
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device->s2b_shift) >> 1);
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}
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out:
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free_page((long) label);
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return rc;
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}
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/* Fill in virtual disk geometry for device. Return zero on success, non-zero
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* otherwise. */
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static int
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dasd_diag_fill_geometry(struct dasd_device *device, struct hd_geometry *geo)
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{
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if (dasd_check_blocksize(device->bp_block) != 0)
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return -EINVAL;
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geo->cylinders = (device->blocks << device->s2b_shift) >> 10;
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geo->heads = 16;
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geo->sectors = 128 >> device->s2b_shift;
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return 0;
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}
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static dasd_era_t
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dasd_diag_examine_error(struct dasd_ccw_req * cqr, struct irb * stat)
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{
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return dasd_era_fatal;
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}
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static dasd_erp_fn_t
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dasd_diag_erp_action(struct dasd_ccw_req * cqr)
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{
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return dasd_default_erp_action;
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}
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static dasd_erp_fn_t
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dasd_diag_erp_postaction(struct dasd_ccw_req * cqr)
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{
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return dasd_default_erp_postaction;
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}
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/* Create DASD request from block device request. Return pointer to new
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* request on success, ERR_PTR otherwise. */
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static struct dasd_ccw_req *
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dasd_diag_build_cp(struct dasd_device * device, struct request *req)
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{
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struct dasd_ccw_req *cqr;
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struct dasd_diag_req *dreq;
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struct dasd_diag_bio *dbio;
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struct bio *bio;
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struct bio_vec *bv;
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char *dst;
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unsigned int count, datasize;
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sector_t recid, first_rec, last_rec;
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unsigned int blksize, off;
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unsigned char rw_cmd;
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int i;
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if (rq_data_dir(req) == READ)
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rw_cmd = MDSK_READ_REQ;
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else if (rq_data_dir(req) == WRITE)
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rw_cmd = MDSK_WRITE_REQ;
|
|
else
|
|
return ERR_PTR(-EINVAL);
|
|
blksize = device->bp_block;
|
|
/* Calculate record id of first and last block. */
|
|
first_rec = req->sector >> device->s2b_shift;
|
|
last_rec = (req->sector + req->nr_sectors - 1) >> device->s2b_shift;
|
|
/* Check struct bio and count the number of blocks for the request. */
|
|
count = 0;
|
|
rq_for_each_bio(bio, req) {
|
|
bio_for_each_segment(bv, bio, i) {
|
|
if (bv->bv_len & (blksize - 1))
|
|
/* Fba can only do full blocks. */
|
|
return ERR_PTR(-EINVAL);
|
|
count += bv->bv_len >> (device->s2b_shift + 9);
|
|
}
|
|
}
|
|
/* Paranoia. */
|
|
if (count != last_rec - first_rec + 1)
|
|
return ERR_PTR(-EINVAL);
|
|
/* Build the request */
|
|
datasize = sizeof(struct dasd_diag_req) +
|
|
count*sizeof(struct dasd_diag_bio);
|
|
cqr = dasd_smalloc_request(dasd_diag_discipline.name, 0,
|
|
datasize, device);
|
|
if (IS_ERR(cqr))
|
|
return cqr;
|
|
|
|
dreq = (struct dasd_diag_req *) cqr->data;
|
|
dreq->block_count = count;
|
|
dbio = dreq->bio;
|
|
recid = first_rec;
|
|
rq_for_each_bio(bio, req) {
|
|
bio_for_each_segment(bv, bio, i) {
|
|
dst = page_address(bv->bv_page) + bv->bv_offset;
|
|
for (off = 0; off < bv->bv_len; off += blksize) {
|
|
memset(dbio, 0, sizeof (struct dasd_diag_bio));
|
|
dbio->type = rw_cmd;
|
|
dbio->block_number = recid + 1;
|
|
dbio->buffer = dst;
|
|
dbio++;
|
|
dst += blksize;
|
|
recid++;
|
|
}
|
|
}
|
|
}
|
|
cqr->retries = DIAG_MAX_RETRIES;
|
|
cqr->buildclk = get_clock();
|
|
if (req->cmd_flags & REQ_FAILFAST)
|
|
set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
|
|
cqr->device = device;
|
|
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)
|
|
{
|
|
int status;
|
|
|
|
status = cqr->status == DASD_CQR_DONE;
|
|
dasd_sfree_request(cqr, cqr->device);
|
|
return status;
|
|
}
|
|
|
|
/* Fill in IOCTL data for device. */
|
|
static int
|
|
dasd_diag_fill_info(struct dasd_device * device,
|
|
struct dasd_information2_t * info)
|
|
{
|
|
struct dasd_diag_private *private;
|
|
|
|
private = (struct dasd_diag_private *) device->private;
|
|
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);
|
|
memcpy(info->characteristics,
|
|
&((struct dasd_diag_private *) device->private)->rdc_data,
|
|
sizeof (struct dasd_diag_characteristics));
|
|
info->confdata_size = 0;
|
|
return 0;
|
|
}
|
|
|
|
static void
|
|
dasd_diag_dump_sense(struct dasd_device *device, struct dasd_ccw_req * req,
|
|
struct irb *stat)
|
|
{
|
|
DEV_MESSAGE(KERN_ERR, device, "%s",
|
|
"dump sense not available for DIAG data");
|
|
}
|
|
|
|
static struct dasd_discipline dasd_diag_discipline = {
|
|
.owner = THIS_MODULE,
|
|
.name = "DIAG",
|
|
.ebcname = "DIAG",
|
|
.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,
|
|
.build_cp = dasd_diag_build_cp,
|
|
.free_cp = dasd_diag_free_cp,
|
|
.dump_sense = dasd_diag_dump_sense,
|
|
.fill_info = dasd_diag_fill_info,
|
|
};
|
|
|
|
static int __init
|
|
dasd_diag_init(void)
|
|
{
|
|
if (!MACHINE_IS_VM) {
|
|
MESSAGE_LOG(KERN_INFO,
|
|
"Machine is not VM: %s "
|
|
"discipline not initializing",
|
|
dasd_diag_discipline.name);
|
|
return -ENODEV;
|
|
}
|
|
ASCEBC(dasd_diag_discipline.ebcname, 4);
|
|
|
|
ctl_set_bit(0, 9);
|
|
register_external_interrupt(0x2603, dasd_ext_handler);
|
|
dasd_diag_discipline_pointer = &dasd_diag_discipline;
|
|
return 0;
|
|
}
|
|
|
|
static void __exit
|
|
dasd_diag_cleanup(void)
|
|
{
|
|
unregister_external_interrupt(0x2603, dasd_ext_handler);
|
|
ctl_clear_bit(0, 9);
|
|
dasd_diag_discipline_pointer = NULL;
|
|
}
|
|
|
|
module_init(dasd_diag_init);
|
|
module_exit(dasd_diag_cleanup);
|