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695 lines
19 KiB
695 lines
19 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Author(s)......: Holger Smolinski <[email protected]> |
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* Based on.......: linux/drivers/s390/block/mdisk.c |
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* ...............: by Hartmunt Penner <[email protected]> |
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* Bugreports.to..: <[email protected]> |
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* Copyright IBM Corp. 1999, 2000 |
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* |
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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 "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[]; |
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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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bio = kzalloc(sizeof(*bio), GFP_KERNEL); |
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if (bio == NULL) { |
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DBF_DEV_EVENT(DBF_WARNING, device, "%s", |
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"No memory to allocate initialization bio"); |
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rc = -ENOMEM; |
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goto out_label; |
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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(*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_bio; |
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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_bio; |
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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_bio: |
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kfree(bio); |
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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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|
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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; |
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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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|
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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 *dasd_diag_build_cp(struct dasd_device *memdev, |
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struct dasd_block *block, |
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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 req_iterator iter; |
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struct bio_vec bv; |
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char *dst; |
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unsigned int count; |
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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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|
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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; |
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else |
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return ERR_PTR(-EINVAL); |
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blksize = block->bp_block; |
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/* Calculate record id of first and last block. */ |
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first_rec = blk_rq_pos(req) >> block->s2b_shift; |
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last_rec = |
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(blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift; |
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/* Check struct bio and count the number of blocks for the request. */ |
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count = 0; |
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rq_for_each_segment(bv, req, iter) { |
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if (bv.bv_len & (blksize - 1)) |
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/* Fba can only do full blocks. */ |
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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 */ |
|
cqr = dasd_smalloc_request(DASD_DIAG_MAGIC, 0, struct_size(dreq, bio, count), |
|
memdev, blk_mq_rq_to_pdu(req)); |
|
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"); |
|
} |
|
|
|
/* |
|
* Initialize block layer request queue. |
|
*/ |
|
static void dasd_diag_setup_blk_queue(struct dasd_block *block) |
|
{ |
|
unsigned int logical_block_size = block->bp_block; |
|
struct request_queue *q = block->request_queue; |
|
int max; |
|
|
|
max = DIAG_MAX_BLOCKS << block->s2b_shift; |
|
blk_queue_flag_set(QUEUE_FLAG_NONROT, q); |
|
q->limits.max_dev_sectors = max; |
|
blk_queue_logical_block_size(q, logical_block_size); |
|
blk_queue_max_hw_sectors(q, max); |
|
blk_queue_max_segments(q, USHRT_MAX); |
|
/* With page sized segments each segment can be translated into one idaw/tidaw */ |
|
blk_queue_max_segment_size(q, PAGE_SIZE); |
|
blk_queue_segment_boundary(q, PAGE_SIZE - 1); |
|
} |
|
|
|
static int dasd_diag_pe_handler(struct dasd_device *device, |
|
__u8 tbvpm, __u8 fcsecpm) |
|
{ |
|
return dasd_generic_verify_path(device, tbvpm); |
|
} |
|
|
|
static struct dasd_discipline dasd_diag_discipline = { |
|
.owner = THIS_MODULE, |
|
.name = "DIAG", |
|
.ebcname = "DIAG", |
|
.check_device = dasd_diag_check_device, |
|
.pe_handler = dasd_diag_pe_handler, |
|
.fill_geometry = dasd_diag_fill_geometry, |
|
.setup_blk_queue = dasd_diag_setup_blk_queue, |
|
.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);
|
|
|