663 lines
18 KiB
C
663 lines
18 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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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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* Copyright IBM Corp. 1999, 2000
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*
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*/
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#define KMSG_COMPONENT "dasd"
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#include <linux/kernel_stat.h>
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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/diag.h>
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#include <asm/ebcdic.h>
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#include <asm/io.h>
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#include <asm/irq.h>
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#include <asm/vtoc.h>
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#include <asm/diag.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
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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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struct ccw_dev_id dev_id;
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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 reg2 asm ("2") = (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 2,%2,0x250\n"
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"0: ipm %0\n"
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" srl %0,28\n"
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" or %0,3\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" (reg2), "m" (*(addr_type *) iob)
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: "3", "cc");
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return rc;
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}
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static inline int dia250(void *iob, int cmd)
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{
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diag_stat_inc(DIAG_STAT_X250);
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return __dia250(iob, cmd);
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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 = device->private;
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struct dasd_diag_init_io *iib = &private->iib;
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int rc;
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memset(iib, 0, sizeof (struct dasd_diag_init_io));
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iib->dev_nr = private->dev_id.devno;
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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 = device->private;
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struct dasd_diag_init_io *iib = &private->iib;
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int rc;
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memset(iib, 0, sizeof (struct dasd_diag_init_io));
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iib->dev_nr = private->dev_id.devno;
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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->block->bp_block, 0, NULL);
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if (rc == 4) {
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if (!(test_and_set_bit(DASD_FLAG_DEVICE_RO, &device->flags)))
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pr_warn("%s: The access mode of a DIAG device changed to read-only\n",
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dev_name(&device->cdev->dev));
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rc = 0;
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}
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if (rc)
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pr_warn("%s: DIAG ERP failed with rc=%d\n",
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dev_name(&device->cdev->dev), 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->startdev;
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if (cqr->retries < 0) {
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DBF_DEV_EVENT(DBF_ERR, device, "DIAG start_IO: request %p "
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"- no retry left)", cqr);
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cqr->status = DASD_CQR_ERROR;
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return -EIO;
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}
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private = device->private;
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dreq = cqr->data;
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private->iob.dev_nr = private->dev_id.devno;
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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_tod_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_tod_clock();
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cqr->status = DASD_CQR_SUCCESS;
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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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DBF_DEV_EVENT(DBF_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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cqr->intrc = rc;
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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->startdev;
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mdsk_term_io(device);
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mdsk_init_io(device, device->block->bp_block, 0, NULL);
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cqr->status = DASD_CQR_CLEAR_PENDING;
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cqr->stopclk = get_tod_clock();
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dasd_schedule_device_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 dasd_ext_handler(struct ext_code ext_code,
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unsigned int param32, unsigned long param64)
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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 expires;
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unsigned long flags;
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addr_t ip;
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int rc;
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switch (ext_code.subcode >> 8) {
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case DASD_DIAG_CODE_31BIT:
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ip = (addr_t) param32;
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break;
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case DASD_DIAG_CODE_64BIT:
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ip = (addr_t) param64;
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break;
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default:
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return;
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}
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inc_irq_stat(IRQEXT_DSD);
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if (!ip) { /* no intparm: unsolicited interrupt */
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DBF_EVENT(DBF_NOTICE, "%s", "caught unsolicited "
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"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->startdev;
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if (strncmp(device->discipline->ebcname, (char *) &cqr->magic, 4)) {
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DBF_DEV_EVENT(DBF_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_PENDING) {
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cqr->status = DASD_CQR_CLEARED;
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dasd_device_clear_timer(device);
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dasd_schedule_device_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_tod_clock();
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expires = 0;
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if ((ext_code.subcode & 0xff) == 0) {
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cqr->status = DASD_CQR_SUCCESS;
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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, devlist);
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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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}
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}
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} else {
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cqr->status = DASD_CQR_QUEUED;
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DBF_DEV_EVENT(DBF_DEBUG, device, "interrupt status for "
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"request %p was %d (%d retries left)", cqr,
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ext_code.subcode & 0xff, 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_device_set_timer(device, expires);
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else
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dasd_device_clear_timer(device);
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dasd_schedule_device_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 = device->private;
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struct dasd_diag_characteristics *rdc_data;
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struct vtoc_cms_label *label;
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struct dasd_block *block;
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struct dasd_diag_bio bio;
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unsigned int sb, bsize;
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blocknum_t end_block;
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int rc;
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if (private == NULL) {
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private = kzalloc(sizeof(*private), GFP_KERNEL);
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if (private == NULL) {
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DBF_DEV_EVENT(DBF_WARNING, device, "%s",
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"Allocating memory for private DASD data "
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"failed\n");
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return -ENOMEM;
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}
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ccw_device_get_id(device->cdev, &private->dev_id);
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device->private = private;
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}
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block = dasd_alloc_block();
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if (IS_ERR(block)) {
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DBF_DEV_EVENT(DBF_WARNING, device, "%s",
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"could not allocate dasd block structure");
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device->private = NULL;
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kfree(private);
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return PTR_ERR(block);
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}
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device->block = block;
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block->base = device;
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/* Read Device Characteristics */
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rdc_data = &private->rdc_data;
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rdc_data->dev_nr = private->dev_id.devno;
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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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DBF_DEV_EVENT(DBF_WARNING, device, "failed to retrieve device "
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"information (rc=%d)", rc);
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rc = -EOPNOTSUPP;
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goto out;
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}
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device->default_expires = DIAG_TIMEOUT;
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device->default_retries = DIAG_MAX_RETRIES;
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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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pr_warn("%s: Device type %d is not supported in DIAG mode\n",
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dev_name(&device->cdev->dev),
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private->rdc_data.vdev_class);
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rc = -EOPNOTSUPP;
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goto out;
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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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DBF_DEV_EVENT(DBF_WARNING, device, "%s",
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"No memory to allocate initialization request");
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rc = -ENOMEM;
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goto out;
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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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pr_warn("%s: A 64-bit DIAG call failed\n",
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dev_name(&device->cdev->dev));
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rc = -EOPNOTSUPP;
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goto out_label;
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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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pr_warn("%s: Accessing the DASD failed because of an incorrect format (rc=%d)\n",
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dev_name(&device->cdev->dev), rc);
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rc = -EIO;
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goto out_label;
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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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block->blocks = (unsigned long) label->block_count;
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} else
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block->blocks = end_block;
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block->bp_block = bsize;
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block->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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block->s2b_shift++;
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rc = mdsk_init_io(device, block->bp_block, 0, NULL);
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if (rc && (rc != 4)) {
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pr_warn("%s: DIAG initialization failed with rc=%d\n",
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dev_name(&device->cdev->dev), rc);
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rc = -EIO;
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} else {
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if (rc == 4)
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set_bit(DASD_FLAG_DEVICE_RO, &device->flags);
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pr_info("%s: New DASD with %ld byte/block, total size %ld "
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"KB%s\n", dev_name(&device->cdev->dev),
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(unsigned long) block->bp_block,
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(unsigned long) (block->blocks <<
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block->s2b_shift) >> 1,
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(rc == 4) ? ", read-only device" : "");
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rc = 0;
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}
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out_label:
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free_page((long) label);
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out:
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if (rc) {
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device->block = NULL;
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dasd_free_block(block);
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device->private = NULL;
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kfree(private);
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}
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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_block *block, struct hd_geometry *geo)
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{
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if (dasd_check_blocksize(block->bp_block) != 0)
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return -EINVAL;
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geo->cylinders = (block->blocks << block->s2b_shift) >> 10;
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geo->heads = 16;
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geo->sectors = 128 >> block->s2b_shift;
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return 0;
|
|
}
|
|
|
|
static dasd_erp_fn_t
|
|
dasd_diag_erp_action(struct dasd_ccw_req * cqr)
|
|
{
|
|
return dasd_default_erp_action;
|
|
}
|
|
|
|
static dasd_erp_fn_t
|
|
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 *memdev,
|
|
struct dasd_block *block,
|
|
struct request *req)
|
|
{
|
|
struct dasd_ccw_req *cqr;
|
|
struct dasd_diag_req *dreq;
|
|
struct dasd_diag_bio *dbio;
|
|
struct req_iterator iter;
|
|
struct bio_vec bv;
|
|
char *dst;
|
|
unsigned int count, datasize;
|
|
sector_t recid, first_rec, last_rec;
|
|
unsigned int blksize, off;
|
|
unsigned char rw_cmd;
|
|
|
|
if (rq_data_dir(req) == READ)
|
|
rw_cmd = MDSK_READ_REQ;
|
|
else if (rq_data_dir(req) == WRITE)
|
|
rw_cmd = MDSK_WRITE_REQ;
|
|
else
|
|
return ERR_PTR(-EINVAL);
|
|
blksize = block->bp_block;
|
|
/* Calculate record id of first and last block. */
|
|
first_rec = blk_rq_pos(req) >> block->s2b_shift;
|
|
last_rec =
|
|
(blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift;
|
|
/* Check struct bio and count the number of blocks for the request. */
|
|
count = 0;
|
|
rq_for_each_segment(bv, req, iter) {
|
|
if (bv.bv_len & (blksize - 1))
|
|
/* Fba can only do full blocks. */
|
|
return ERR_PTR(-EINVAL);
|
|
count += bv.bv_len >> (block->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_MAGIC, 0, datasize, memdev);
|
|
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_segment(bv, req, iter) {
|
|
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 = memdev->default_retries;
|
|
cqr->buildclk = get_tod_clock();
|
|
if (blk_noretry_request(req) ||
|
|
block->base->features & DASD_FEATURE_FAILFAST)
|
|
set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
|
|
cqr->startdev = memdev;
|
|
cqr->memdev = memdev;
|
|
cqr->block = block;
|
|
cqr->expires = memdev->default_expires * HZ;
|
|
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->memdev);
|
|
return status;
|
|
}
|
|
|
|
static void dasd_diag_handle_terminated_request(struct dasd_ccw_req *cqr)
|
|
{
|
|
if (cqr->retries < 0)
|
|
cqr->status = DASD_CQR_FAILED;
|
|
else
|
|
cqr->status = DASD_CQR_FILLED;
|
|
};
|
|
|
|
/* 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 = device->private;
|
|
|
|
info->label_block = (unsigned int) private->pt_block;
|
|
info->FBA_layout = 1;
|
|
info->format = DASD_FORMAT_LDL;
|
|
info->characteristics_size = sizeof(private->rdc_data);
|
|
memcpy(info->characteristics, &private->rdc_data,
|
|
sizeof(private->rdc_data));
|
|
info->confdata_size = 0;
|
|
return 0;
|
|
}
|
|
|
|
static void
|
|
dasd_diag_dump_sense(struct dasd_device *device, struct dasd_ccw_req * req,
|
|
struct irb *stat)
|
|
{
|
|
DBF_DEV_EVENT(DBF_WARNING, 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,
|
|
.verify_path = dasd_generic_verify_path,
|
|
.fill_geometry = dasd_diag_fill_geometry,
|
|
.start_IO = dasd_start_diag,
|
|
.term_IO = dasd_diag_term_IO,
|
|
.handle_terminated_request = dasd_diag_handle_terminated_request,
|
|
.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) {
|
|
pr_info("Discipline %s cannot be used without z/VM\n",
|
|
dasd_diag_discipline.name);
|
|
return -ENODEV;
|
|
}
|
|
ASCEBC(dasd_diag_discipline.ebcname, 4);
|
|
|
|
irq_subclass_register(IRQ_SUBCLASS_SERVICE_SIGNAL);
|
|
register_external_irq(EXT_IRQ_CP_SERVICE, dasd_ext_handler);
|
|
dasd_diag_discipline_pointer = &dasd_diag_discipline;
|
|
return 0;
|
|
}
|
|
|
|
static void __exit
|
|
dasd_diag_cleanup(void)
|
|
{
|
|
unregister_external_irq(EXT_IRQ_CP_SERVICE, dasd_ext_handler);
|
|
irq_subclass_unregister(IRQ_SUBCLASS_SERVICE_SIGNAL);
|
|
dasd_diag_discipline_pointer = NULL;
|
|
}
|
|
|
|
module_init(dasd_diag_init);
|
|
module_exit(dasd_diag_cleanup);
|