[PATCH] s390: dasd extended error reporting
The DASD extended error reporting is a facility that allows to get detailed information about certain problems in the DASD I/O. This information can be used to implement fail-over applications that can recover these problems. Signed-off-by: Stefan Weinhuber <wein@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Stefan Weinhuber
Linus Torvalds
parent
554a826e0a
commit
20c644680a
8 changed files with 812 additions and 1 deletions
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@ -55,4 +55,12 @@ config DASD_DIAG
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Disks under VM. If you are not running under VM or unsure what it is,
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say "N".
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config DASD_EER
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bool "Extended error reporting (EER)"
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depends on DASD
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help
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This driver provides a character device interface to the
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DASD extended error reporting. This is only needed if you want to
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use applications written for the EER facility.
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endif
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@ -7,6 +7,9 @@ dasd_fba_mod-objs := dasd_fba.o dasd_3370_erp.o dasd_9336_erp.o
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dasd_diag_mod-objs := dasd_diag.o
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dasd_mod-objs := dasd.o dasd_ioctl.o dasd_proc.o dasd_devmap.o \
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dasd_genhd.o dasd_erp.o
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ifdef CONFIG_DASD_EER
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dasd_mod-objs += dasd_eer.o
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endif
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obj-$(CONFIG_DASD) += dasd_mod.o
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obj-$(CONFIG_DASD_DIAG) += dasd_diag_mod.o
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@ -151,6 +151,8 @@ dasd_state_new_to_known(struct dasd_device *device)
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static inline void
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dasd_state_known_to_new(struct dasd_device * device)
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{
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/* Disable extended error reporting for this device. */
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dasd_eer_disable(device);
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/* Forget the discipline information. */
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if (device->discipline)
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module_put(device->discipline->owner);
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@ -892,6 +894,9 @@ dasd_handle_state_change_pending(struct dasd_device *device)
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struct dasd_ccw_req *cqr;
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struct list_head *l, *n;
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/* First of all start sense subsystem status request. */
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dasd_eer_snss(device);
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device->stopped &= ~DASD_STOPPED_PENDING;
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/* restart all 'running' IO on queue */
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@ -1111,6 +1116,19 @@ __dasd_process_ccw_queue(struct dasd_device * device,
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}
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goto restart;
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}
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/* First of all call extended error reporting. */
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if (dasd_eer_enabled(device) &&
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cqr->status == DASD_CQR_FAILED) {
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dasd_eer_write(device, cqr, DASD_EER_FATALERROR);
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/* restart request */
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cqr->status = DASD_CQR_QUEUED;
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cqr->retries = 255;
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device->stopped |= DASD_STOPPED_QUIESCE;
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goto restart;
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}
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/* Process finished ERP request. */
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if (cqr->refers) {
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__dasd_process_erp(device, cqr);
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@ -1248,7 +1266,8 @@ __dasd_start_head(struct dasd_device * device)
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cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, list);
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/* check FAILFAST */
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if (device->stopped & ~DASD_STOPPED_PENDING &&
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test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags)) {
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test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags) &&
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(!dasd_eer_enabled(device))) {
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cqr->status = DASD_CQR_FAILED;
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dasd_schedule_bh(device);
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}
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@ -1807,6 +1826,7 @@ dasd_exit(void)
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#ifdef CONFIG_PROC_FS
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dasd_proc_exit();
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#endif
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dasd_eer_exit();
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if (dasd_page_cache != NULL) {
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kmem_cache_destroy(dasd_page_cache);
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dasd_page_cache = NULL;
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@ -2003,6 +2023,9 @@ dasd_generic_notify(struct ccw_device *cdev, int event)
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switch (event) {
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case CIO_GONE:
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case CIO_NO_PATH:
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/* First of all call extended error reporting. */
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dasd_eer_write(device, NULL, DASD_EER_NOPATH);
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if (device->state < DASD_STATE_BASIC)
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break;
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/* Device is active. We want to keep it. */
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@ -2060,6 +2083,7 @@ dasd_generic_auto_online (struct ccw_driver *dasd_discipline_driver)
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put_driver(drv);
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}
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static int __init
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dasd_init(void)
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{
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@ -2092,6 +2116,9 @@ dasd_init(void)
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rc = dasd_parse();
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if (rc)
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goto failed;
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rc = dasd_eer_init();
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if (rc)
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goto failed;
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#ifdef CONFIG_PROC_FS
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rc = dasd_proc_init();
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if (rc)
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@ -1108,6 +1108,9 @@ dasd_3990_handle_env_data(struct dasd_ccw_req * erp, char *sense)
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case 0x0B:
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DEV_MESSAGE(KERN_WARNING, device, "%s",
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"FORMAT F - Volume is suspended duplex");
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/* call extended error reporting (EER) */
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dasd_eer_write(device, erp->refers,
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DASD_EER_PPRCSUSPEND);
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break;
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case 0x0C:
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DEV_MESSAGE(KERN_WARNING, device, "%s",
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@ -715,10 +715,51 @@ dasd_discipline_show(struct device *dev, struct device_attribute *attr, char *bu
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static DEVICE_ATTR(discipline, 0444, dasd_discipline_show, NULL);
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/*
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* extended error-reporting
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*/
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static ssize_t
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dasd_eer_show(struct device *dev, struct device_attribute *attr, char *buf)
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{
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struct dasd_devmap *devmap;
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int eer_flag;
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devmap = dasd_find_busid(dev->bus_id);
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if (!IS_ERR(devmap) && devmap->device)
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eer_flag = dasd_eer_enabled(devmap->device);
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else
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eer_flag = 0;
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return snprintf(buf, PAGE_SIZE, eer_flag ? "1\n" : "0\n");
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}
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static ssize_t
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dasd_eer_store(struct device *dev, struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct dasd_devmap *devmap;
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int rc;
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devmap = dasd_devmap_from_cdev(to_ccwdev(dev));
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if (IS_ERR(devmap))
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return PTR_ERR(devmap);
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if (!devmap->device)
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return count;
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if (buf[0] == '1') {
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rc = dasd_eer_enable(devmap->device);
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if (rc)
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return rc;
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} else
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dasd_eer_disable(devmap->device);
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return count;
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}
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static DEVICE_ATTR(eer_enabled, 0644, dasd_eer_show, dasd_eer_store);
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static struct attribute * dasd_attrs[] = {
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&dev_attr_readonly.attr,
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&dev_attr_discipline.attr,
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&dev_attr_use_diag.attr,
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&dev_attr_eer_enabled.attr,
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NULL,
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};
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@ -29,6 +29,7 @@
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#define DASD_ECKD_CCW_PSF 0x27
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#define DASD_ECKD_CCW_RSSD 0x3e
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#define DASD_ECKD_CCW_LOCATE_RECORD 0x47
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#define DASD_ECKD_CCW_SNSS 0x54
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#define DASD_ECKD_CCW_DEFINE_EXTENT 0x63
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#define DASD_ECKD_CCW_WRITE_MT 0x85
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#define DASD_ECKD_CCW_READ_MT 0x86
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682
drivers/s390/block/dasd_eer.c
Normal file
682
drivers/s390/block/dasd_eer.c
Normal file
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@ -0,0 +1,682 @@
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/*
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* Character device driver for extended error reporting.
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*
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* Copyright (C) 2005 IBM Corporation
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* extended error reporting for DASD ECKD devices
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* Author(s): Stefan Weinhuber <wein@de.ibm.com>
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*/
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#include <linux/init.h>
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#include <linux/fs.h>
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#include <linux/kernel.h>
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#include <linux/miscdevice.h>
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/device.h>
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#include <linux/poll.h>
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#include <asm/uaccess.h>
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#include <asm/semaphore.h>
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#include <asm/atomic.h>
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#include <asm/ebcdic.h>
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#include "dasd_int.h"
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#include "dasd_eckd.h"
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#ifdef PRINTK_HEADER
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#undef PRINTK_HEADER
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#endif /* PRINTK_HEADER */
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#define PRINTK_HEADER "dasd(eer):"
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/*
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* SECTION: the internal buffer
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*/
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/*
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* The internal buffer is meant to store obaque blobs of data, so it does
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* not know of higher level concepts like triggers.
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* It consists of a number of pages that are used as a ringbuffer. Each data
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* blob is stored in a simple record that consists of an integer, which
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* contains the size of the following data, and the data bytes themselfes.
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*
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* To allow for multiple independent readers we create one internal buffer
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* each time the device is opened and destroy the buffer when the file is
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* closed again. The number of pages used for this buffer is determined by
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* the module parmeter eer_pages.
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*
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* One record can be written to a buffer by using the functions
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* - dasd_eer_start_record (one time per record to write the size to the
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* buffer and reserve the space for the data)
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* - dasd_eer_write_buffer (one or more times per record to write the data)
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* The data can be written in several steps but you will have to compute
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* the total size up front for the invocation of dasd_eer_start_record.
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* If the ringbuffer is full, dasd_eer_start_record will remove the required
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* number of old records.
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*
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* A record is typically read in two steps, first read the integer that
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* specifies the size of the following data, then read the data.
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* Both can be done by
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* - dasd_eer_read_buffer
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*
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* For all mentioned functions you need to get the bufferlock first and keep
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* it until a complete record is written or read.
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*
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* All information necessary to keep track of an internal buffer is kept in
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* a struct eerbuffer. The buffer specific to a file pointer is strored in
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* the private_data field of that file. To be able to write data to all
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* existing buffers, each buffer is also added to the bufferlist.
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* If the user does not want to read a complete record in one go, we have to
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* keep track of the rest of the record. residual stores the number of bytes
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* that are still to deliver. If the rest of the record is invalidated between
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* two reads then residual will be set to -1 so that the next read will fail.
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* All entries in the eerbuffer structure are protected with the bufferlock.
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* To avoid races between writing to a buffer on the one side and creating
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* and destroying buffers on the other side, the bufferlock must also be used
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* to protect the bufferlist.
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*/
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static int eer_pages = 5;
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module_param(eer_pages, int, S_IRUGO|S_IWUSR);
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struct eerbuffer {
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struct list_head list;
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char **buffer;
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int buffersize;
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int buffer_page_count;
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int head;
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int tail;
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int residual;
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};
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static LIST_HEAD(bufferlist);
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static spinlock_t bufferlock = SPIN_LOCK_UNLOCKED;
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static DECLARE_WAIT_QUEUE_HEAD(dasd_eer_read_wait_queue);
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/*
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* How many free bytes are available on the buffer.
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* Needs to be called with bufferlock held.
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*/
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static int dasd_eer_get_free_bytes(struct eerbuffer *eerb)
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{
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if (eerb->head < eerb->tail)
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return eerb->tail - eerb->head - 1;
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return eerb->buffersize - eerb->head + eerb->tail -1;
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}
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/*
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* How many bytes of buffer space are used.
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* Needs to be called with bufferlock held.
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*/
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static int dasd_eer_get_filled_bytes(struct eerbuffer *eerb)
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{
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if (eerb->head >= eerb->tail)
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return eerb->head - eerb->tail;
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return eerb->buffersize - eerb->tail + eerb->head;
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}
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/*
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* The dasd_eer_write_buffer function just copies count bytes of data
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* to the buffer. Make sure to call dasd_eer_start_record first, to
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* make sure that enough free space is available.
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* Needs to be called with bufferlock held.
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*/
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static void dasd_eer_write_buffer(struct eerbuffer *eerb,
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char *data, int count)
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{
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unsigned long headindex,localhead;
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unsigned long rest, len;
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char *nextdata;
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nextdata = data;
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rest = count;
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while (rest > 0) {
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headindex = eerb->head / PAGE_SIZE;
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localhead = eerb->head % PAGE_SIZE;
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len = min(rest, PAGE_SIZE - localhead);
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memcpy(eerb->buffer[headindex]+localhead, nextdata, len);
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nextdata += len;
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rest -= len;
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eerb->head += len;
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if (eerb->head == eerb->buffersize)
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eerb->head = 0; /* wrap around */
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BUG_ON(eerb->head > eerb->buffersize);
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}
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}
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/*
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* Needs to be called with bufferlock held.
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*/
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static int dasd_eer_read_buffer(struct eerbuffer *eerb, char *data, int count)
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{
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unsigned long tailindex,localtail;
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unsigned long rest, len, finalcount;
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char *nextdata;
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finalcount = min(count, dasd_eer_get_filled_bytes(eerb));
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nextdata = data;
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rest = finalcount;
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while (rest > 0) {
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tailindex = eerb->tail / PAGE_SIZE;
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localtail = eerb->tail % PAGE_SIZE;
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len = min(rest, PAGE_SIZE - localtail);
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memcpy(nextdata, eerb->buffer[tailindex] + localtail, len);
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nextdata += len;
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rest -= len;
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eerb->tail += len;
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if (eerb->tail == eerb->buffersize)
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eerb->tail = 0; /* wrap around */
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BUG_ON(eerb->tail > eerb->buffersize);
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}
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return finalcount;
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}
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/*
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* Whenever you want to write a blob of data to the internal buffer you
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* have to start by using this function first. It will write the number
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* of bytes that will be written to the buffer. If necessary it will remove
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* old records to make room for the new one.
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* Needs to be called with bufferlock held.
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*/
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static int dasd_eer_start_record(struct eerbuffer *eerb, int count)
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{
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int tailcount;
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if (count + sizeof(count) > eerb->buffersize)
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return -ENOMEM;
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while (dasd_eer_get_free_bytes(eerb) < count + sizeof(count)) {
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if (eerb->residual > 0) {
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eerb->tail += eerb->residual;
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if (eerb->tail >= eerb->buffersize)
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eerb->tail -= eerb->buffersize;
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eerb->residual = -1;
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}
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dasd_eer_read_buffer(eerb, (char *) &tailcount,
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sizeof(tailcount));
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eerb->tail += tailcount;
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if (eerb->tail >= eerb->buffersize)
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eerb->tail -= eerb->buffersize;
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}
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dasd_eer_write_buffer(eerb, (char*) &count, sizeof(count));
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return 0;
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};
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/*
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* Release pages that are not used anymore.
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*/
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static void dasd_eer_free_buffer_pages(char **buf, int no_pages)
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{
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int i;
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for (i = 0; i < no_pages; i++)
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free_page((unsigned long) buf[i]);
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}
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/*
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* Allocate a new set of memory pages.
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*/
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static int dasd_eer_allocate_buffer_pages(char **buf, int no_pages)
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{
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int i;
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for (i = 0; i < no_pages; i++) {
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buf[i] = (char *) get_zeroed_page(GFP_KERNEL);
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if (!buf[i]) {
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dasd_eer_free_buffer_pages(buf, i);
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return -ENOMEM;
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}
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}
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return 0;
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}
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/*
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* SECTION: The extended error reporting functionality
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*/
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/*
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* When a DASD device driver wants to report an error, it calls the
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* function dasd_eer_write and gives the respective trigger ID as
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* parameter. Currently there are four kinds of triggers:
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*
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* DASD_EER_FATALERROR: all kinds of unrecoverable I/O problems
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* DASD_EER_PPRCSUSPEND: PPRC was suspended
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* DASD_EER_NOPATH: There is no path to the device left.
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* DASD_EER_STATECHANGE: The state of the device has changed.
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*
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* For the first three triggers all required information can be supplied by
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* the caller. For these triggers a record is written by the function
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* dasd_eer_write_standard_trigger.
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*
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* The DASD_EER_STATECHANGE trigger is special since a sense subsystem
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* status ccw need to be executed to gather the necessary sense data first.
|
||||
* The dasd_eer_snss function will queue the SNSS request and the request
|
||||
* callback will then call dasd_eer_write with the DASD_EER_STATCHANGE
|
||||
* trigger.
|
||||
*
|
||||
* To avoid memory allocations at runtime, the necessary memory is allocated
|
||||
* when the extended error reporting is enabled for a device (by
|
||||
* dasd_eer_probe). There is one sense subsystem status request for each
|
||||
* eer enabled DASD device. The presence of the cqr in device->eer_cqr
|
||||
* indicates that eer is enable for the device. The use of the snss request
|
||||
* is protected by the DASD_FLAG_EER_IN_USE bit. When this flag indicates
|
||||
* that the cqr is currently in use, dasd_eer_snss cannot start a second
|
||||
* request but sets the DASD_FLAG_EER_SNSS flag instead. The callback of
|
||||
* the SNSS request will check the bit and call dasd_eer_snss again.
|
||||
*/
|
||||
|
||||
#define SNSS_DATA_SIZE 44
|
||||
|
||||
#define DASD_EER_BUSID_SIZE 10
|
||||
struct dasd_eer_header {
|
||||
__u32 total_size;
|
||||
__u32 trigger;
|
||||
__u64 tv_sec;
|
||||
__u64 tv_usec;
|
||||
char busid[DASD_EER_BUSID_SIZE];
|
||||
};
|
||||
|
||||
/*
|
||||
* The following function can be used for those triggers that have
|
||||
* all necessary data available when the function is called.
|
||||
* If the parameter cqr is not NULL, the chain of requests will be searched
|
||||
* for valid sense data, and all valid sense data sets will be added to
|
||||
* the triggers data.
|
||||
*/
|
||||
static void dasd_eer_write_standard_trigger(struct dasd_device *device,
|
||||
struct dasd_ccw_req *cqr,
|
||||
int trigger)
|
||||
{
|
||||
struct dasd_ccw_req *temp_cqr;
|
||||
int data_size;
|
||||
struct timeval tv;
|
||||
struct dasd_eer_header header;
|
||||
unsigned long flags;
|
||||
struct eerbuffer *eerb;
|
||||
|
||||
/* go through cqr chain and count the valid sense data sets */
|
||||
data_size = 0;
|
||||
for (temp_cqr = cqr; temp_cqr; temp_cqr = temp_cqr->refers)
|
||||
if (temp_cqr->irb.esw.esw0.erw.cons)
|
||||
data_size += 32;
|
||||
|
||||
header.total_size = sizeof(header) + data_size + 4; /* "EOR" */
|
||||
header.trigger = trigger;
|
||||
do_gettimeofday(&tv);
|
||||
header.tv_sec = tv.tv_sec;
|
||||
header.tv_usec = tv.tv_usec;
|
||||
strncpy(header.busid, device->cdev->dev.bus_id, DASD_EER_BUSID_SIZE);
|
||||
|
||||
spin_lock_irqsave(&bufferlock, flags);
|
||||
list_for_each_entry(eerb, &bufferlist, list) {
|
||||
dasd_eer_start_record(eerb, header.total_size);
|
||||
dasd_eer_write_buffer(eerb, (char *) &header, sizeof(header));
|
||||
for (temp_cqr = cqr; temp_cqr; temp_cqr = temp_cqr->refers)
|
||||
if (temp_cqr->irb.esw.esw0.erw.cons)
|
||||
dasd_eer_write_buffer(eerb, cqr->irb.ecw, 32);
|
||||
dasd_eer_write_buffer(eerb, "EOR", 4);
|
||||
}
|
||||
spin_unlock_irqrestore(&bufferlock, flags);
|
||||
wake_up_interruptible(&dasd_eer_read_wait_queue);
|
||||
}
|
||||
|
||||
/*
|
||||
* This function writes a DASD_EER_STATECHANGE trigger.
|
||||
*/
|
||||
static void dasd_eer_write_snss_trigger(struct dasd_device *device,
|
||||
struct dasd_ccw_req *cqr,
|
||||
int trigger)
|
||||
{
|
||||
int data_size;
|
||||
int snss_rc;
|
||||
struct timeval tv;
|
||||
struct dasd_eer_header header;
|
||||
unsigned long flags;
|
||||
struct eerbuffer *eerb;
|
||||
|
||||
snss_rc = (cqr->status == DASD_CQR_FAILED) ? -EIO : 0;
|
||||
if (snss_rc)
|
||||
data_size = 0;
|
||||
else
|
||||
data_size = SNSS_DATA_SIZE;
|
||||
|
||||
header.total_size = sizeof(header) + data_size + 4; /* "EOR" */
|
||||
header.trigger = DASD_EER_STATECHANGE;
|
||||
do_gettimeofday(&tv);
|
||||
header.tv_sec = tv.tv_sec;
|
||||
header.tv_usec = tv.tv_usec;
|
||||
strncpy(header.busid, device->cdev->dev.bus_id, DASD_EER_BUSID_SIZE);
|
||||
|
||||
spin_lock_irqsave(&bufferlock, flags);
|
||||
list_for_each_entry(eerb, &bufferlist, list) {
|
||||
dasd_eer_start_record(eerb, header.total_size);
|
||||
dasd_eer_write_buffer(eerb, (char *) &header , sizeof(header));
|
||||
if (!snss_rc)
|
||||
dasd_eer_write_buffer(eerb, cqr->data, SNSS_DATA_SIZE);
|
||||
dasd_eer_write_buffer(eerb, "EOR", 4);
|
||||
}
|
||||
spin_unlock_irqrestore(&bufferlock, flags);
|
||||
wake_up_interruptible(&dasd_eer_read_wait_queue);
|
||||
}
|
||||
|
||||
/*
|
||||
* This function is called for all triggers. It calls the appropriate
|
||||
* function that writes the actual trigger records.
|
||||
*/
|
||||
void dasd_eer_write(struct dasd_device *device, struct dasd_ccw_req *cqr,
|
||||
unsigned int id)
|
||||
{
|
||||
if (!device->eer_cqr)
|
||||
return;
|
||||
switch (id) {
|
||||
case DASD_EER_FATALERROR:
|
||||
case DASD_EER_PPRCSUSPEND:
|
||||
dasd_eer_write_standard_trigger(device, cqr, id);
|
||||
break;
|
||||
case DASD_EER_NOPATH:
|
||||
dasd_eer_write_standard_trigger(device, NULL, id);
|
||||
break;
|
||||
case DASD_EER_STATECHANGE:
|
||||
dasd_eer_write_snss_trigger(device, cqr, id);
|
||||
break;
|
||||
default: /* unknown trigger, so we write it without any sense data */
|
||||
dasd_eer_write_standard_trigger(device, NULL, id);
|
||||
break;
|
||||
}
|
||||
}
|
||||
EXPORT_SYMBOL(dasd_eer_write);
|
||||
|
||||
/*
|
||||
* Start a sense subsystem status request.
|
||||
* Needs to be called with the device held.
|
||||
*/
|
||||
void dasd_eer_snss(struct dasd_device *device)
|
||||
{
|
||||
struct dasd_ccw_req *cqr;
|
||||
|
||||
cqr = device->eer_cqr;
|
||||
if (!cqr) /* Device not eer enabled. */
|
||||
return;
|
||||
if (test_and_set_bit(DASD_FLAG_EER_IN_USE, &device->flags)) {
|
||||
/* Sense subsystem status request in use. */
|
||||
set_bit(DASD_FLAG_EER_SNSS, &device->flags);
|
||||
return;
|
||||
}
|
||||
clear_bit(DASD_FLAG_EER_SNSS, &device->flags);
|
||||
cqr->status = DASD_CQR_QUEUED;
|
||||
list_add(&cqr->list, &device->ccw_queue);
|
||||
dasd_schedule_bh(device);
|
||||
}
|
||||
|
||||
/*
|
||||
* Callback function for use with sense subsystem status request.
|
||||
*/
|
||||
static void dasd_eer_snss_cb(struct dasd_ccw_req *cqr, void *data)
|
||||
{
|
||||
struct dasd_device *device = cqr->device;
|
||||
unsigned long flags;
|
||||
|
||||
dasd_eer_write(device, cqr, DASD_EER_STATECHANGE);
|
||||
spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
|
||||
if (device->eer_cqr == cqr) {
|
||||
clear_bit(DASD_FLAG_EER_IN_USE, &device->flags);
|
||||
if (test_bit(DASD_FLAG_EER_SNSS, &device->flags))
|
||||
/* Another SNSS has been requested in the meantime. */
|
||||
dasd_eer_snss(device);
|
||||
cqr = NULL;
|
||||
}
|
||||
spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
|
||||
if (cqr)
|
||||
/*
|
||||
* Extended error recovery has been switched off while
|
||||
* the SNSS request was running. It could even have
|
||||
* been switched off and on again in which case there
|
||||
* is a new ccw in device->eer_cqr. Free the "old"
|
||||
* snss request now.
|
||||
*/
|
||||
dasd_kfree_request(cqr, device);
|
||||
}
|
||||
|
||||
/*
|
||||
* Enable error reporting on a given device.
|
||||
*/
|
||||
int dasd_eer_enable(struct dasd_device *device)
|
||||
{
|
||||
struct dasd_ccw_req *cqr;
|
||||
unsigned long flags;
|
||||
|
||||
if (device->eer_cqr)
|
||||
return 0;
|
||||
|
||||
if (!device->discipline || strcmp(device->discipline->name, "ECKD"))
|
||||
return -EPERM; /* FIXME: -EMEDIUMTYPE ? */
|
||||
|
||||
cqr = dasd_kmalloc_request("ECKD", 1 /* SNSS */,
|
||||
SNSS_DATA_SIZE, device);
|
||||
if (!cqr)
|
||||
return -ENOMEM;
|
||||
|
||||
cqr->device = device;
|
||||
cqr->retries = 255;
|
||||
cqr->expires = 10 * HZ;
|
||||
|
||||
cqr->cpaddr->cmd_code = DASD_ECKD_CCW_SNSS;
|
||||
cqr->cpaddr->count = SNSS_DATA_SIZE;
|
||||
cqr->cpaddr->flags = 0;
|
||||
cqr->cpaddr->cda = (__u32)(addr_t) cqr->data;
|
||||
|
||||
cqr->buildclk = get_clock();
|
||||
cqr->status = DASD_CQR_FILLED;
|
||||
cqr->callback = dasd_eer_snss_cb;
|
||||
|
||||
spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
|
||||
if (!device->eer_cqr) {
|
||||
device->eer_cqr = cqr;
|
||||
cqr = NULL;
|
||||
}
|
||||
spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
|
||||
if (cqr)
|
||||
dasd_kfree_request(cqr, device);
|
||||
return 0;
|
||||
}
|
||||
|
||||
/*
|
||||
* Disable error reporting on a given device.
|
||||
*/
|
||||
void dasd_eer_disable(struct dasd_device *device)
|
||||
{
|
||||
struct dasd_ccw_req *cqr;
|
||||
unsigned long flags;
|
||||
int in_use;
|
||||
|
||||
if (!device->eer_cqr)
|
||||
return;
|
||||
spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
|
||||
cqr = device->eer_cqr;
|
||||
device->eer_cqr = NULL;
|
||||
clear_bit(DASD_FLAG_EER_SNSS, &device->flags);
|
||||
in_use = test_and_clear_bit(DASD_FLAG_EER_IN_USE, &device->flags);
|
||||
spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
|
||||
if (cqr && !in_use)
|
||||
dasd_kfree_request(cqr, device);
|
||||
}
|
||||
|
||||
/*
|
||||
* SECTION: the device operations
|
||||
*/
|
||||
|
||||
/*
|
||||
* On the one side we need a lock to access our internal buffer, on the
|
||||
* other side a copy_to_user can sleep. So we need to copy the data we have
|
||||
* to transfer in a readbuffer, which is protected by the readbuffer_mutex.
|
||||
*/
|
||||
static char readbuffer[PAGE_SIZE];
|
||||
static DECLARE_MUTEX(readbuffer_mutex);
|
||||
|
||||
static int dasd_eer_open(struct inode *inp, struct file *filp)
|
||||
{
|
||||
struct eerbuffer *eerb;
|
||||
unsigned long flags;
|
||||
|
||||
eerb = kzalloc(sizeof(struct eerbuffer), GFP_KERNEL);
|
||||
eerb->buffer_page_count = eer_pages;
|
||||
if (eerb->buffer_page_count < 1 ||
|
||||
eerb->buffer_page_count > INT_MAX / PAGE_SIZE) {
|
||||
kfree(eerb);
|
||||
MESSAGE(KERN_WARNING, "can't open device since module "
|
||||
"parameter eer_pages is smaller then 1 or"
|
||||
" bigger then %d", (int)(INT_MAX / PAGE_SIZE));
|
||||
return -EINVAL;
|
||||
}
|
||||
eerb->buffersize = eerb->buffer_page_count * PAGE_SIZE;
|
||||
eerb->buffer = kmalloc(eerb->buffer_page_count * sizeof(char *),
|
||||
GFP_KERNEL);
|
||||
if (!eerb->buffer) {
|
||||
kfree(eerb);
|
||||
return -ENOMEM;
|
||||
}
|
||||
if (dasd_eer_allocate_buffer_pages(eerb->buffer,
|
||||
eerb->buffer_page_count)) {
|
||||
kfree(eerb->buffer);
|
||||
kfree(eerb);
|
||||
return -ENOMEM;
|
||||
}
|
||||
filp->private_data = eerb;
|
||||
spin_lock_irqsave(&bufferlock, flags);
|
||||
list_add(&eerb->list, &bufferlist);
|
||||
spin_unlock_irqrestore(&bufferlock, flags);
|
||||
|
||||
return nonseekable_open(inp,filp);
|
||||
}
|
||||
|
||||
static int dasd_eer_close(struct inode *inp, struct file *filp)
|
||||
{
|
||||
struct eerbuffer *eerb;
|
||||
unsigned long flags;
|
||||
|
||||
eerb = (struct eerbuffer *) filp->private_data;
|
||||
spin_lock_irqsave(&bufferlock, flags);
|
||||
list_del(&eerb->list);
|
||||
spin_unlock_irqrestore(&bufferlock, flags);
|
||||
dasd_eer_free_buffer_pages(eerb->buffer, eerb->buffer_page_count);
|
||||
kfree(eerb->buffer);
|
||||
kfree(eerb);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static ssize_t dasd_eer_read(struct file *filp, char __user *buf,
|
||||
size_t count, loff_t *ppos)
|
||||
{
|
||||
int tc,rc;
|
||||
int tailcount,effective_count;
|
||||
unsigned long flags;
|
||||
struct eerbuffer *eerb;
|
||||
|
||||
eerb = (struct eerbuffer *) filp->private_data;
|
||||
if (down_interruptible(&readbuffer_mutex))
|
||||
return -ERESTARTSYS;
|
||||
|
||||
spin_lock_irqsave(&bufferlock, flags);
|
||||
|
||||
if (eerb->residual < 0) { /* the remainder of this record */
|
||||
/* has been deleted */
|
||||
eerb->residual = 0;
|
||||
spin_unlock_irqrestore(&bufferlock, flags);
|
||||
up(&readbuffer_mutex);
|
||||
return -EIO;
|
||||
} else if (eerb->residual > 0) {
|
||||
/* OK we still have a second half of a record to deliver */
|
||||
effective_count = min(eerb->residual, (int) count);
|
||||
eerb->residual -= effective_count;
|
||||
} else {
|
||||
tc = 0;
|
||||
while (!tc) {
|
||||
tc = dasd_eer_read_buffer(eerb, (char *) &tailcount,
|
||||
sizeof(tailcount));
|
||||
if (!tc) {
|
||||
/* no data available */
|
||||
spin_unlock_irqrestore(&bufferlock, flags);
|
||||
up(&readbuffer_mutex);
|
||||
if (filp->f_flags & O_NONBLOCK)
|
||||
return -EAGAIN;
|
||||
rc = wait_event_interruptible(
|
||||
dasd_eer_read_wait_queue,
|
||||
eerb->head != eerb->tail);
|
||||
if (rc)
|
||||
return rc;
|
||||
if (down_interruptible(&readbuffer_mutex))
|
||||
return -ERESTARTSYS;
|
||||
spin_lock_irqsave(&bufferlock, flags);
|
||||
}
|
||||
}
|
||||
WARN_ON(tc != sizeof(tailcount));
|
||||
effective_count = min(tailcount,(int)count);
|
||||
eerb->residual = tailcount - effective_count;
|
||||
}
|
||||
|
||||
tc = dasd_eer_read_buffer(eerb, readbuffer, effective_count);
|
||||
WARN_ON(tc != effective_count);
|
||||
|
||||
spin_unlock_irqrestore(&bufferlock, flags);
|
||||
|
||||
if (copy_to_user(buf, readbuffer, effective_count)) {
|
||||
up(&readbuffer_mutex);
|
||||
return -EFAULT;
|
||||
}
|
||||
|
||||
up(&readbuffer_mutex);
|
||||
return effective_count;
|
||||
}
|
||||
|
||||
static unsigned int dasd_eer_poll(struct file *filp, poll_table *ptable)
|
||||
{
|
||||
unsigned int mask;
|
||||
unsigned long flags;
|
||||
struct eerbuffer *eerb;
|
||||
|
||||
eerb = (struct eerbuffer *) filp->private_data;
|
||||
poll_wait(filp, &dasd_eer_read_wait_queue, ptable);
|
||||
spin_lock_irqsave(&bufferlock, flags);
|
||||
if (eerb->head != eerb->tail)
|
||||
mask = POLLIN | POLLRDNORM ;
|
||||
else
|
||||
mask = 0;
|
||||
spin_unlock_irqrestore(&bufferlock, flags);
|
||||
return mask;
|
||||
}
|
||||
|
||||
static struct file_operations dasd_eer_fops = {
|
||||
.open = &dasd_eer_open,
|
||||
.release = &dasd_eer_close,
|
||||
.read = &dasd_eer_read,
|
||||
.poll = &dasd_eer_poll,
|
||||
.owner = THIS_MODULE,
|
||||
};
|
||||
|
||||
static struct miscdevice dasd_eer_dev = {
|
||||
.minor = MISC_DYNAMIC_MINOR,
|
||||
.name = "dasd_eer",
|
||||
.fops = &dasd_eer_fops,
|
||||
};
|
||||
|
||||
int __init dasd_eer_init(void)
|
||||
{
|
||||
int rc;
|
||||
|
||||
rc = misc_register(&dasd_eer_dev);
|
||||
if (rc) {
|
||||
MESSAGE(KERN_ERR, "%s", "dasd_eer_init could not "
|
||||
"register misc device");
|
||||
return rc;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
void __exit dasd_eer_exit(void)
|
||||
{
|
||||
WARN_ON(misc_deregister(&dasd_eer_dev) != 0);
|
||||
}
|
||||
|
|
@ -268,6 +268,23 @@ struct dasd_discipline {
|
|||
|
||||
extern struct dasd_discipline *dasd_diag_discipline_pointer;
|
||||
|
||||
|
||||
/*
|
||||
* Notification numbers for extended error reporting notifications:
|
||||
* The DASD_EER_DISABLE notification is sent before a dasd_device (and it's
|
||||
* eer pointer) is freed. The error reporting module needs to do all necessary
|
||||
* cleanup steps.
|
||||
* The DASD_EER_TRIGGER notification sends the actual error reports (triggers).
|
||||
*/
|
||||
#define DASD_EER_DISABLE 0
|
||||
#define DASD_EER_TRIGGER 1
|
||||
|
||||
/* Trigger IDs for extended error reporting DASD_EER_TRIGGER notification */
|
||||
#define DASD_EER_FATALERROR 1
|
||||
#define DASD_EER_NOPATH 2
|
||||
#define DASD_EER_STATECHANGE 3
|
||||
#define DASD_EER_PPRCSUSPEND 4
|
||||
|
||||
struct dasd_device {
|
||||
/* Block device stuff. */
|
||||
struct gendisk *gdp;
|
||||
|
|
@ -281,6 +298,9 @@ struct dasd_device {
|
|||
unsigned long flags; /* per device flags */
|
||||
unsigned short features; /* copy of devmap-features (read-only!) */
|
||||
|
||||
/* extended error reporting stuff (eer) */
|
||||
struct dasd_ccw_req *eer_cqr;
|
||||
|
||||
/* Device discipline stuff. */
|
||||
struct dasd_discipline *discipline;
|
||||
struct dasd_discipline *base_discipline;
|
||||
|
|
@ -326,6 +346,8 @@ struct dasd_device {
|
|||
/* per device flags */
|
||||
#define DASD_FLAG_DSC_ERROR 2 /* return -EIO when disconnected */
|
||||
#define DASD_FLAG_OFFLINE 3 /* device is in offline processing */
|
||||
#define DASD_FLAG_EER_SNSS 4 /* A SNSS is required */
|
||||
#define DASD_FLAG_EER_IN_USE 5 /* A SNSS request is running */
|
||||
|
||||
void dasd_put_device_wake(struct dasd_device *);
|
||||
|
||||
|
|
@ -545,6 +567,30 @@ dasd_era_t dasd_9336_erp_examine(struct dasd_ccw_req *, struct irb *);
|
|||
dasd_era_t dasd_9343_erp_examine(struct dasd_ccw_req *, struct irb *);
|
||||
struct dasd_ccw_req *dasd_9343_erp_action(struct dasd_ccw_req *);
|
||||
|
||||
/* externals in dasd_eer.c */
|
||||
#ifdef CONFIG_DASD_EER
|
||||
int dasd_eer_init(void);
|
||||
void dasd_eer_exit(void);
|
||||
int dasd_eer_enable(struct dasd_device *);
|
||||
void dasd_eer_disable(struct dasd_device *);
|
||||
void dasd_eer_write(struct dasd_device *, struct dasd_ccw_req *cqr,
|
||||
unsigned int id);
|
||||
void dasd_eer_snss(struct dasd_device *);
|
||||
|
||||
static inline int dasd_eer_enabled(struct dasd_device *device)
|
||||
{
|
||||
return device->eer_cqr != NULL;
|
||||
}
|
||||
#else
|
||||
#define dasd_eer_init() (0)
|
||||
#define dasd_eer_exit() do { } while (0)
|
||||
#define dasd_eer_enable(d) (0)
|
||||
#define dasd_eer_disable(d) do { } while (0)
|
||||
#define dasd_eer_write(d,c,i) do { } while (0)
|
||||
#define dasd_eer_snss(d) do { } while (0)
|
||||
#define dasd_eer_enabled(d) (0)
|
||||
#endif /* CONFIG_DASD_ERR */
|
||||
|
||||
#endif /* __KERNEL__ */
|
||||
|
||||
#endif /* DASD_H */
|
||||
|
|
|
|||
Loading…
Reference in a new issue