The module went in after it was resent without addressing any issue.
It still has a questionable ioctl interface, is split bogusly out of
dasd_mod, uses a non-typesafe notifier chain mechanisms, etc. Back it
out for now, designing a sane interface for this needs some time. I'll
do my best to help the IBM people to get there.
drivers/s390/block/Kconfig | 8
drivers/s390/block/Makefile | 2
drivers/s390/block/dasd.c | 76 --
drivers/s390/block/dasd_3990_erp.c | 3
drivers/s390/block/dasd_eckd.h | 1
drivers/s390/block/dasd_eer.c | 1090 -------------------------------------
drivers/s390/block/dasd_int.h | 37 -
include/asm-s390/dasd.h | 13
8 files changed, 2 insertions(+), 1228 deletions(-)
Signed-off-by: Christoph Hellwig <[email protected]>
Index: linux-2.6.16-rc2-mm1/drivers/s390/block/Kconfig
===================================================================
--- linux-2.6.16-rc2-mm1.orig/drivers/s390/block/Kconfig 2006-02-11 16:49:58.000000000 +0100
+++ linux-2.6.16-rc2-mm1/drivers/s390/block/Kconfig 2006-02-11 16:53:18.000000000 +0100
@@ -55,12 +55,4 @@
Disks under VM. If you are not running under VM or unsure what it is,
say "N".
-config DASD_EER
- tristate "Extended error reporting (EER)"
- depends on DASD
- help
- This driver provides a character device interface to the
- DASD extended error reporting. This is only needed if you want to
- use applications written for the EER facility.
-
endif
Index: linux-2.6.16-rc2-mm1/drivers/s390/block/Makefile
===================================================================
--- linux-2.6.16-rc2-mm1.orig/drivers/s390/block/Makefile 2006-02-11 16:49:58.000000000 +0100
+++ linux-2.6.16-rc2-mm1/drivers/s390/block/Makefile 2006-02-11 16:53:11.000000000 +0100
@@ -5,7 +5,6 @@
dasd_eckd_mod-objs := dasd_eckd.o dasd_3990_erp.o dasd_9343_erp.o
dasd_fba_mod-objs := dasd_fba.o dasd_3370_erp.o dasd_9336_erp.o
dasd_diag_mod-objs := dasd_diag.o
-dasd_eer_mod-objs := dasd_eer.o
dasd_mod-objs := dasd.o dasd_ioctl.o dasd_proc.o dasd_devmap.o \
dasd_genhd.o dasd_erp.o
@@ -13,6 +12,5 @@
obj-$(CONFIG_DASD_DIAG) += dasd_diag_mod.o
obj-$(CONFIG_DASD_ECKD) += dasd_eckd_mod.o
obj-$(CONFIG_DASD_FBA) += dasd_fba_mod.o
-obj-$(CONFIG_DASD_EER) += dasd_eer.o
obj-$(CONFIG_BLK_DEV_XPRAM) += xpram.o
obj-$(CONFIG_DCSSBLK) += dcssblk.o
Index: linux-2.6.16-rc2-mm1/drivers/s390/block/dasd.c
===================================================================
--- linux-2.6.16-rc2-mm1.orig/drivers/s390/block/dasd.c 2006-02-11 16:12:17.000000000 +0100
+++ linux-2.6.16-rc2-mm1/drivers/s390/block/dasd.c 2006-02-11 16:52:56.000000000 +0100
@@ -18,7 +18,6 @@
#include <linux/slab.h>
#include <linux/buffer_head.h>
#include <linux/hdreg.h>
-#include <linux/notifier.h>
#include <asm/ccwdev.h>
#include <asm/ebcdic.h>
@@ -58,7 +57,6 @@
static void dasd_flush_ccw_queue(struct dasd_device *, int);
static void dasd_tasklet(struct dasd_device *);
static void do_kick_device(void *data);
-static void dasd_disable_eer(struct dasd_device *device);
/*
* SECTION: Operations on the device structure.
@@ -153,8 +151,6 @@
static inline void
dasd_state_known_to_new(struct dasd_device * device)
{
- /* disable extended error reporting for this device */
- dasd_disable_eer(device);
/* Forget the discipline information. */
device->discipline = NULL;
device->state = DASD_STATE_NEW;
@@ -871,9 +867,6 @@
struct dasd_ccw_req *cqr;
struct list_head *l, *n;
- /* first of all call extended error reporting */
- dasd_write_eer_trigger(DASD_EER_STATECHANGE, device, NULL);
-
device->stopped &= ~DASD_STOPPED_PENDING;
/* restart all 'running' IO on queue */
@@ -1093,19 +1086,6 @@
}
goto restart;
}
-
- /* first of all call extended error reporting */
- if (device->eer && cqr->status == DASD_CQR_FAILED) {
- dasd_write_eer_trigger(DASD_EER_FATALERROR,
- device, cqr);
-
- /* restart request */
- cqr->status = DASD_CQR_QUEUED;
- cqr->retries = 255;
- device->stopped |= DASD_STOPPED_QUIESCE;
- goto restart;
- }
-
/* Process finished ERP request. */
if (cqr->refers) {
__dasd_process_erp(device, cqr);
@@ -1243,8 +1223,7 @@
cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, list);
/* check FAILFAST */
if (device->stopped & ~DASD_STOPPED_PENDING &&
- test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags) &&
- (!device->eer)) {
+ test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags)) {
cqr->status = DASD_CQR_FAILED;
dasd_schedule_bh(device);
}
@@ -1985,9 +1964,6 @@
switch (event) {
case CIO_GONE:
case CIO_NO_PATH:
- /* first of all call extended error reporting */
- dasd_write_eer_trigger(DASD_EER_NOPATH, device, NULL);
-
if (device->state < DASD_STATE_BASIC)
break;
/* Device is active. We want to keep it. */
@@ -2045,51 +2021,6 @@
put_driver(drv);
}
-/*
- * notifications for extended error reports
- */
-static struct notifier_block *dasd_eer_chain;
-
-int
-dasd_register_eer_notifier(struct notifier_block *nb)
-{
- return notifier_chain_register(&dasd_eer_chain, nb);
-}
-
-int
-dasd_unregister_eer_notifier(struct notifier_block *nb)
-{
- return notifier_chain_unregister(&dasd_eer_chain, nb);
-}
-
-/*
- * Notify the registered error reporting module of a problem
- */
-void
-dasd_write_eer_trigger(unsigned int id, struct dasd_device *device,
- struct dasd_ccw_req *cqr)
-{
- if (device->eer) {
- struct dasd_eer_trigger temp;
- temp.id = id;
- temp.device = device;
- temp.cqr = cqr;
- notifier_call_chain(&dasd_eer_chain, DASD_EER_TRIGGER,
- (void *)&temp);
- }
-}
-
-/*
- * Tell the registered error reporting module to disable error reporting for
- * a given device and to cleanup any private data structures on that device.
- */
-static void
-dasd_disable_eer(struct dasd_device *device)
-{
- notifier_call_chain(&dasd_eer_chain, DASD_EER_DISABLE, (void *)device);
-}
-
-
static int __init
dasd_init(void)
{
@@ -2168,11 +2099,6 @@
EXPORT_SYMBOL_GPL(dasd_generic_set_offline);
EXPORT_SYMBOL_GPL(dasd_generic_auto_online);
-EXPORT_SYMBOL(dasd_register_eer_notifier);
-EXPORT_SYMBOL(dasd_unregister_eer_notifier);
-EXPORT_SYMBOL(dasd_write_eer_trigger);
-
-
/*
* Overrides for Emacs so that we follow Linus's tabbing style.
* Emacs will notice this stuff at the end of the file and automatically
Index: linux-2.6.16-rc2-mm1/drivers/s390/block/dasd_3990_erp.c
===================================================================
--- linux-2.6.16-rc2-mm1.orig/drivers/s390/block/dasd_3990_erp.c 2006-02-08 16:12:17.000000000 +0100
+++ linux-2.6.16-rc2-mm1/drivers/s390/block/dasd_3990_erp.c 2006-02-11 16:52:56.000000000 +0100
@@ -1108,9 +1108,6 @@
case 0x0B:
DEV_MESSAGE(KERN_WARNING, device, "%s",
"FORMAT F - Volume is suspended duplex");
- /* call extended error reporting (EER) */
- dasd_write_eer_trigger(DASD_EER_PPRCSUSPEND, device,
- erp->refers);
break;
case 0x0C:
DEV_MESSAGE(KERN_WARNING, device, "%s",
Index: linux-2.6.16-rc2-mm1/drivers/s390/block/dasd_eckd.h
===================================================================
--- linux-2.6.16-rc2-mm1.orig/drivers/s390/block/dasd_eckd.h 2006-02-08 16:12:17.000000000 +0100
+++ linux-2.6.16-rc2-mm1/drivers/s390/block/dasd_eckd.h 2006-02-11 16:52:56.000000000 +0100
@@ -29,7 +29,6 @@
#define DASD_ECKD_CCW_PSF 0x27
#define DASD_ECKD_CCW_RSSD 0x3e
#define DASD_ECKD_CCW_LOCATE_RECORD 0x47
-#define DASD_ECKD_CCW_SNSS 0x54
#define DASD_ECKD_CCW_DEFINE_EXTENT 0x63
#define DASD_ECKD_CCW_WRITE_MT 0x85
#define DASD_ECKD_CCW_READ_MT 0x86
Index: linux-2.6.16-rc2-mm1/drivers/s390/block/dasd_eer.c
===================================================================
--- linux-2.6.16-rc2-mm1.orig/drivers/s390/block/dasd_eer.c 2006-02-08 16:12:18.000000000 +0100
+++ /dev/null 1970-01-01 00:00:00.000000000 +0000
@@ -1,1090 +0,0 @@
-/*
- * character device driver for extended error reporting
- *
- *
- * Copyright (C) 2005 IBM Corporation
- * extended error reporting for DASD ECKD devices
- * Author(s): Stefan Weinhuber <[email protected]>
- *
- */
-
-#include <linux/init.h>
-#include <linux/fs.h>
-#include <linux/kernel.h>
-#include <linux/miscdevice.h>
-#include <linux/module.h>
-#include <linux/moduleparam.h>
-#include <linux/device.h>
-#include <linux/workqueue.h>
-#include <linux/poll.h>
-#include <linux/notifier.h>
-
-#include <asm/uaccess.h>
-#include <asm/semaphore.h>
-#include <asm/atomic.h>
-#include <asm/ebcdic.h>
-
-#include "dasd_int.h"
-#include "dasd_eckd.h"
-
-
-MODULE_LICENSE("GPL");
-
-MODULE_AUTHOR("Stefan Weinhuber <[email protected]>");
-MODULE_DESCRIPTION("DASD extended error reporting module");
-
-
-#ifdef PRINTK_HEADER
-#undef PRINTK_HEADER
-#endif /* PRINTK_HEADER */
-#define PRINTK_HEADER "dasd(eer):"
-
-
-
-
-
-/*****************************************************************************/
-/* the internal buffer */
-/*****************************************************************************/
-
-/*
- * The internal buffer is meant to store obaque blobs of data, so it doesn't
- * know of higher level concepts like triggers.
- * It consists of a number of pages that are used as a ringbuffer. Each data
- * blob is stored in a simple record that consists of an integer, which
- * contains the size of the following data, and the data bytes themselfes.
- *
- * To allow for multiple independent readers we create one internal buffer
- * each time the device is opened and destroy the buffer when the file is
- * closed again.
- *
- * One record can be written to a buffer by using the functions
- * - dasd_eer_start_record (one time per record to write the size to the buffer
- * and reserve the space for the data)
- * - dasd_eer_write_buffer (one or more times per record to write the data)
- * The data can be written in several steps but you will have to compute
- * the total size up front for the invocation of dasd_eer_start_record.
- * If the ringbuffer is full, dasd_eer_start_record will remove the required
- * number of old records.
- *
- * A record is typically read in two steps, first read the integer that
- * specifies the size of the following data, then read the data.
- * Both can be done by
- * - dasd_eer_read_buffer
- *
- * For all mentioned functions you need to get the bufferlock first and keep it
- * until a complete record is written or read.
- */
-
-
-/*
- * Alle information necessary to keep track of an internal buffer is kept in
- * a struct eerbuffer. The buffer specific to a file pointer is strored in
- * the private_data field of that file. To be able to write data to all
- * existing buffers, each buffer is also added to the bufferlist.
- * If the user doesn't want to read a complete record in one go, we have to
- * keep track of the rest of the record. residual stores the number of bytes
- * that are still to deliver. If the rest of the record is invalidated between
- * two reads then residual will be set to -1 so that the next read will fail.
- * All entries in the eerbuffer structure are protected with the bufferlock.
- * To avoid races between writing to a buffer on the one side and creating
- * and destroying buffers on the other side, the bufferlock must also be used
- * to protect the bufferlist.
- */
-
-struct eerbuffer {
- struct list_head list;
- char **buffer;
- int buffersize;
- int buffer_page_count;
- int head;
- int tail;
- int residual;
-};
-
-LIST_HEAD(bufferlist);
-
-static spinlock_t bufferlock = SPIN_LOCK_UNLOCKED;
-
-DECLARE_WAIT_QUEUE_HEAD(dasd_eer_read_wait_queue);
-
-/*
- * How many free bytes are available on the buffer.
- * needs to be called with bufferlock held
- */
-static int
-dasd_eer_get_free_bytes(struct eerbuffer *eerb)
-{
- if (eerb->head < eerb->tail) {
- return eerb->tail - eerb->head - 1;
- } else
- return eerb->buffersize - eerb->head + eerb->tail -1;
-}
-
-/*
- * How many bytes of buffer space are used.
- * needs to be called with bufferlock held
- */
-static int
-dasd_eer_get_filled_bytes(struct eerbuffer *eerb)
-{
-
- if (eerb->head >= eerb->tail) {
- return eerb->head - eerb->tail;
- } else
- return eerb->buffersize - eerb->tail + eerb->head;
-}
-
-/*
- * The dasd_eer_write_buffer function just copies count bytes of data
- * to the buffer. Make sure to call dasd_eer_start_record first, to
- * make sure that enough free space is available.
- * needs to be called with bufferlock held
- */
-static void
-dasd_eer_write_buffer(struct eerbuffer *eerb, int count, char *data)
-{
-
- unsigned long headindex,localhead;
- unsigned long rest, len;
- char *nextdata;
-
- nextdata = data;
- rest = count;
- while (rest > 0) {
- headindex = eerb->head / PAGE_SIZE;
- localhead = eerb->head % PAGE_SIZE;
- len = min(rest, (PAGE_SIZE - localhead));
- memcpy(eerb->buffer[headindex]+localhead, nextdata, len);
- nextdata += len;
- rest -= len;
- eerb->head += len;
- if ( eerb->head == eerb->buffersize )
- eerb->head = 0; /* wrap around */
- if (eerb->head > eerb->buffersize) {
- MESSAGE(KERN_ERR, "%s", "runaway buffer head.");
- BUG();
- }
- }
-}
-
-/*
- * needs to be called with bufferlock held
- */
-static int
-dasd_eer_read_buffer(struct eerbuffer *eerb, int count, char *data)
-{
-
- unsigned long tailindex,localtail;
- unsigned long rest, len, finalcount;
- char *nextdata;
-
- finalcount = min(count, dasd_eer_get_filled_bytes(eerb));
- nextdata = data;
- rest = finalcount;
- while (rest > 0) {
- tailindex = eerb->tail / PAGE_SIZE;
- localtail = eerb->tail % PAGE_SIZE;
- len = min(rest, (PAGE_SIZE - localtail));
- memcpy(nextdata, eerb->buffer[tailindex]+localtail, len);
- nextdata += len;
- rest -= len;
- eerb->tail += len;
- if ( eerb->tail == eerb->buffersize )
- eerb->tail = 0; /* wrap around */
- if (eerb->tail > eerb->buffersize) {
- MESSAGE(KERN_ERR, "%s", "runaway buffer tail.");
- BUG();
- }
- }
- return finalcount;
-}
-
-/*
- * Whenever you want to write a blob of data to the internal buffer you
- * have to start by using this function first. It will write the number
- * of bytes that will be written to the buffer. If necessary it will remove
- * old records to make room for the new one.
- * needs to be called with bufferlock held
- */
-static int
-dasd_eer_start_record(struct eerbuffer *eerb, int count)
-{
- int tailcount;
- if (count + sizeof(count) > eerb->buffersize)
- return -ENOMEM;
- while (dasd_eer_get_free_bytes(eerb) < count + sizeof(count)) {
- if (eerb->residual > 0) {
- eerb->tail += eerb->residual;
- if (eerb->tail >= eerb->buffersize)
- eerb->tail -= eerb->buffersize;
- eerb->residual = -1;
- }
- dasd_eer_read_buffer(eerb, sizeof(tailcount),
- (char*)(&tailcount));
- eerb->tail += tailcount;
- if (eerb->tail >= eerb->buffersize)
- eerb->tail -= eerb->buffersize;
- }
- dasd_eer_write_buffer(eerb, sizeof(count), (char*)(&count));
-
- return 0;
-};
-
-/*
- * release pages that are not used anymore
- */
-static void
-dasd_eer_free_buffer_pages(char **buf, int no_pages)
-{
- int i;
-
- for (i = 0; i < no_pages; ++i) {
- free_page((unsigned long)buf[i]);
- }
-}
-
-/*
- * allocate a new set of memory pages
- */
-static int
-dasd_eer_allocate_buffer_pages(char **buf, int no_pages)
-{
- int i;
-
- for (i = 0; i < no_pages; ++i) {
- buf[i] = (char *) get_zeroed_page(GFP_KERNEL);
- if (!buf[i]) {
- dasd_eer_free_buffer_pages(buf, i);
- return -ENOMEM;
- }
- }
- return 0;
-}
-
-/*
- * empty the buffer by resetting head and tail
- * In case there is a half read data blob in the buffer, we set residual
- * to -1 to indicate that the remainder of the blob is lost.
- */
-static void
-dasd_eer_purge_buffer(struct eerbuffer *eerb)
-{
- unsigned long flags;
-
- spin_lock_irqsave(&bufferlock, flags);
- if (eerb->residual > 0)
- eerb->residual = -1;
- eerb->tail=0;
- eerb->head=0;
- spin_unlock_irqrestore(&bufferlock, flags);
-}
-
-/*
- * set the size of the buffer, newsize is the new number of pages to be used
- * we don't try to copy any data back an forth, so any resize will also purge
- * the buffer
- */
-static int
-dasd_eer_resize_buffer(struct eerbuffer *eerb, int newsize)
-{
- int i, oldcount, reuse;
- char **new;
- char **old;
- unsigned long flags;
-
- if (newsize < 1)
- return -EINVAL;
- if (eerb->buffer_page_count == newsize) {
- /* documented behaviour is that any successfull invocation
- * will purge all records */
- dasd_eer_purge_buffer(eerb);
- return 0;
- }
- new = kmalloc(newsize*sizeof(char*), GFP_KERNEL);
- if (!new)
- return -ENOMEM;
-
- reuse=min(eerb->buffer_page_count, newsize);
- for (i = 0; i < reuse; ++i) {
- new[i] = eerb->buffer[i];
- }
- if (eerb->buffer_page_count < newsize) {
- if (dasd_eer_allocate_buffer_pages(
- &new[eerb->buffer_page_count],
- newsize - eerb->buffer_page_count)) {
- kfree(new);
- return -ENOMEM;
- }
- }
-
- spin_lock_irqsave(&bufferlock, flags);
- old = eerb->buffer;
- eerb->buffer = new;
- if (eerb->residual > 0)
- eerb->residual = -1;
- eerb->tail = 0;
- eerb->head = 0;
- oldcount = eerb->buffer_page_count;
- eerb->buffer_page_count = newsize;
- spin_unlock_irqrestore(&bufferlock, flags);
-
- if (oldcount > newsize) {
- for (i = newsize; i < oldcount; ++i) {
- free_page((unsigned long)old[i]);
- }
- }
- kfree(old);
-
- return 0;
-}
-
-
-/*****************************************************************************/
-/* The extended error reporting functionality */
-/*****************************************************************************/
-
-/*
- * When a DASD device driver wants to report an error, it calls the
- * function dasd_eer_write_trigger (via a notifier mechanism) and gives the
- * respective trigger ID as parameter.
- * Currently there are four kinds of triggers:
- *
- * DASD_EER_FATALERROR: all kinds of unrecoverable I/O problems
- * DASD_EER_PPRCSUSPEND: PPRC was suspended
- * DASD_EER_NOPATH: There is no path to the device left.
- * DASD_EER_STATECHANGE: The state of the device has changed.
- *
- * For the first three triggers all required information can be supplied by
- * the caller. For these triggers a record is written by the function
- * dasd_eer_write_standard_trigger.
- *
- * When dasd_eer_write_trigger is called to write a DASD_EER_STATECHANGE
- * trigger, we have to gather the necessary sense data first. We cannot queue
- * the necessary SNSS (sense subsystem status) request immediatly, since we
- * are likely to run in a deadlock situation. Instead, we schedule a
- * work_struct that calls the function dasd_eer_sense_subsystem_status to
- * create and start an SNSS request asynchronously.
- *
- * 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 private eer data structure for each eer
- * enabled DASD device. It contains memory for the work_struct, one SNSS cqr
- * and a flags field that is used to coordinate the use of the cqr. The call
- * to write a state change trigger can come in at any time, so we have one flag
- * CQR_IN_USE that protects the cqr itself. When this flag indicates that the
- * cqr is currently in use, dasd_eer_sense_subsystem_status cannot start a
- * second request but sets the SNSS_REQUESTED flag instead.
- *
- * When the request is finished, the callback function dasd_eer_SNSS_cb
- * is called. This function will invoke the function
- * dasd_eer_write_SNSS_trigger to finally write the trigger. It will also
- * check the SNSS_REQUESTED flag and if it is set it will call
- * dasd_eer_sense_subsystem_status again.
- *
- * To avoid race conditions during the handling of the lock, the flags must
- * be protected by the snsslock.
- */
-
-struct dasd_eer_private {
- struct dasd_ccw_req *cqr;
- unsigned long flags;
- struct work_struct worker;
-};
-
-static void dasd_eer_destroy(struct dasd_device *device,
- struct dasd_eer_private *eer);
-static int
-dasd_eer_write_trigger(struct dasd_eer_trigger *trigger);
-static void dasd_eer_sense_subsystem_status(void *data);
-static int dasd_eer_notify(struct notifier_block *self,
- unsigned long action, void *data);
-
-struct workqueue_struct *dasd_eer_workqueue;
-
-#define SNSS_DATA_SIZE 44
-static spinlock_t snsslock = SPIN_LOCK_UNLOCKED;
-
-#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];
-} __attribute__ ((packed));
-
-static struct notifier_block dasd_eer_nb = {
- .notifier_call = dasd_eer_notify,
-};
-
-/*
- * flags for use with dasd_eer_private
- */
-#define CQR_IN_USE 0
-#define SNSS_REQUESTED 1
-
-/*
- * This function checks if extended error reporting is available for a given
- * dasd_device. If yes, then it creates and returns a struct dasd_eer,
- * otherwise it returns an -EPERM error pointer.
- */
-struct dasd_eer_private *
-dasd_eer_probe(struct dasd_device *device)
-{
- struct dasd_eer_private *private;
-
- if (!(device && device->discipline
- && !strcmp(device->discipline->name, "ECKD"))) {
- return ERR_PTR(-EPERM);
- }
- /* allocate the private data structure */
- private = (struct dasd_eer_private *)kmalloc(
- sizeof(struct dasd_eer_private), GFP_KERNEL);
- if (!private) {
- return ERR_PTR(-ENOMEM);
- }
- INIT_WORK(&private->worker, dasd_eer_sense_subsystem_status,
- (void *)device);
- private->cqr = dasd_kmalloc_request("ECKD",
- 1 /* SNSS */ ,
- SNSS_DATA_SIZE ,
- device);
- if (!private->cqr) {
- kfree(private);
- return ERR_PTR(-ENOMEM);
- }
- private->flags = 0;
- return private;
-};
-
-/*
- * If our private SNSS request is queued, remove it from the
- * dasd ccw queue so we can free the requests memory.
- */
-static void
-dasd_eer_dequeue_SNSS_request(struct dasd_device *device,
- struct dasd_eer_private *eer)
-{
- struct list_head *lst, *nxt;
- struct dasd_ccw_req *cqr, *erpcqr;
- dasd_erp_fn_t erp_fn;
-
- spin_lock_irq(get_ccwdev_lock(device->cdev));
- list_for_each_safe(lst, nxt, &device->ccw_queue) {
- cqr = list_entry(lst, struct dasd_ccw_req, list);
- /* we are looking for two kinds or requests */
- /* first kind: our SNSS request: */
- if (cqr == eer->cqr) {
- if (cqr->status == DASD_CQR_IN_IO)
- device->discipline->term_IO(cqr);
- list_del(&cqr->list);
- break;
- }
- /* second kind: ERP requests for our SNSS request */
- if (cqr->refers) {
- /* If this erp request chain ends in our cqr, then */
- /* cal the erp_postaction to clean it up */
- erpcqr = cqr;
- while (erpcqr->refers) {
- erpcqr = erpcqr->refers;
- }
- if (erpcqr == eer->cqr) {
- erp_fn = device->discipline->erp_postaction(
- cqr);
- erp_fn(cqr);
- }
- continue;
- }
- }
- spin_unlock_irq(get_ccwdev_lock(device->cdev));
-}
-
-/*
- * This function dismantles a struct dasd_eer that was created by
- * dasd_eer_probe. Since we want to free our private data structure,
- * we must make sure that the memory is not in use anymore.
- * We have to flush the work queue and remove a possible SNSS request
- * from the dasd queue.
- */
-static void
-dasd_eer_destroy(struct dasd_device *device, struct dasd_eer_private *eer)
-{
- flush_workqueue(dasd_eer_workqueue);
- dasd_eer_dequeue_SNSS_request(device, eer);
- dasd_kfree_request(eer->cqr, device);
- kfree(eer);
-};
-
-/*
- * enable the extended error reporting for a particular device
- */
-static int
-dasd_eer_enable_on_device(struct dasd_device *device)
-{
- void *eer;
- if (!device)
- return -ENODEV;
- if (device->eer)
- return 0;
- if (!try_module_get(THIS_MODULE)) {
- return -EINVAL;
- }
- eer = (void *)dasd_eer_probe(device);
- if (IS_ERR(eer)) {
- module_put(THIS_MODULE);
- return PTR_ERR(eer);
- }
- device->eer = eer;
- return 0;
-}
-
-/*
- * enable the extended error reporting for a particular device
- */
-static int
-dasd_eer_disable_on_device(struct dasd_device *device)
-{
- struct dasd_eer_private *eer = device->eer;
-
- if (!device)
- return -ENODEV;
- if (!device->eer)
- return 0;
- device->eer = NULL;
- dasd_eer_destroy(device,eer);
- module_put(THIS_MODULE);
-
- return 0;
-}
-
-/*
- * Set extended error reporting (eer)
- * Note: This will be registered as a DASD ioctl, to be called on DASD devices.
- */
-static int
-dasd_ioctl_set_eer(struct block_device *bdev, int no, long args)
-{
- struct dasd_device *device;
- int intval;
-
- if (!capable(CAP_SYS_ADMIN))
- return -EACCES;
- if (bdev != bdev->bd_contains)
- /* Error-reporting is not allowed for partitions */
- return -EINVAL;
- if (get_user(intval, (int __user *) args))
- return -EFAULT;
- device = bdev->bd_disk->private_data;
- if (device == NULL)
- return -ENODEV;
-
- intval = (intval != 0);
- DEV_MESSAGE (KERN_DEBUG, device,
- "set eer on device to %d", intval);
- if (intval)
- return dasd_eer_enable_on_device(device);
- else
- return dasd_eer_disable_on_device(device);
-}
-
-/*
- * Get value of extended error reporting.
- * Note: This will be registered as a DASD ioctl, to be called on DASD devices.
- */
-static int
-dasd_ioctl_get_eer(struct block_device *bdev, int no, long args)
-{
- struct dasd_device *device;
-
- device = bdev->bd_disk->private_data;
- if (device == NULL)
- return -ENODEV;
- return put_user((device->eer != NULL), (int __user *) args);
-}
-
-/*
- * 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 int
-dasd_eer_write_standard_trigger(int trigger, struct dasd_device *device,
- struct dasd_ccw_req *cqr)
-{
- 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 */
- temp_cqr = cqr;
- data_size = 0;
- while (temp_cqr) {
- if (temp_cqr->irb.esw.esw0.erw.cons)
- data_size += 32;
- temp_cqr = temp_cqr->refers;
- }
-
- 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, sizeof(header), (char*)(&header));
- temp_cqr = cqr;
- while (temp_cqr) {
- if (temp_cqr->irb.esw.esw0.erw.cons)
- dasd_eer_write_buffer(eerb, 32, cqr->irb.ecw);
- temp_cqr = temp_cqr->refers;
- }
- dasd_eer_write_buffer(eerb, 4,"EOR");
- }
- spin_unlock_irqrestore(&bufferlock, flags);
-
- wake_up_interruptible(&dasd_eer_read_wait_queue);
-
- return 0;
-}
-
-/*
- * 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 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, sizeof(header),(char*)(&header));
- if (!snss_rc)
- dasd_eer_write_buffer(eerb, SNSS_DATA_SIZE, cqr->data);
- dasd_eer_write_buffer(eerb, 4,"EOR");
- }
- spin_unlock_irqrestore(&bufferlock, flags);
-
- wake_up_interruptible(&dasd_eer_read_wait_queue);
-}
-
-/*
- * callback function for use with SNSS request
- */
-static void
-dasd_eer_SNSS_cb(struct dasd_ccw_req *cqr, void *data)
-{
- struct dasd_device *device;
- struct dasd_eer_private *private;
- unsigned long irqflags;
-
- device = (struct dasd_device *)data;
- private = (struct dasd_eer_private *)device->eer;
- dasd_eer_write_SNSS_trigger(device, cqr);
- spin_lock_irqsave(&snsslock, irqflags);
- if(!test_and_clear_bit(SNSS_REQUESTED, &private->flags)) {
- clear_bit(CQR_IN_USE, &private->flags);
- spin_unlock_irqrestore(&snsslock, irqflags);
- return;
- };
- clear_bit(CQR_IN_USE, &private->flags);
- spin_unlock_irqrestore(&snsslock, irqflags);
- dasd_eer_sense_subsystem_status(device);
- return;
-}
-
-/*
- * clean a used cqr before using it again
- */
-static void
-dasd_eer_clean_SNSS_request(struct dasd_ccw_req *cqr)
-{
- struct ccw1 *cpaddr = cqr->cpaddr;
- void *data = cqr->data;
-
- memset(cqr, 0, sizeof(struct dasd_ccw_req));
- memset(cpaddr, 0, sizeof(struct ccw1));
- memset(data, 0, SNSS_DATA_SIZE);
- cqr->cpaddr = cpaddr;
- cqr->data = data;
- strncpy((char *) &cqr->magic, "ECKD", 4);
- ASCEBC((char *) &cqr->magic, 4);
- set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
-}
-
-/*
- * build and start an SNSS request
- * This function is called from a work queue so we have to
- * pass the dasd_device pointer as a void pointer.
- */
-static void
-dasd_eer_sense_subsystem_status(void *data)
-{
- struct dasd_device *device;
- struct dasd_eer_private *private;
- struct dasd_ccw_req *cqr;
- struct ccw1 *ccw;
- unsigned long irqflags;
-
- device = (struct dasd_device *)data;
- private = (struct dasd_eer_private *)device->eer;
- if (!private) /* device not eer enabled any more */
- return;
- cqr = private->cqr;
- spin_lock_irqsave(&snsslock, irqflags);
- if(test_and_set_bit(CQR_IN_USE, &private->flags)) {
- set_bit(SNSS_REQUESTED, &private->flags);
- spin_unlock_irqrestore(&snsslock, irqflags);
- return;
- };
- spin_unlock_irqrestore(&snsslock, irqflags);
- dasd_eer_clean_SNSS_request(cqr);
- cqr->device = device;
- cqr->retries = 255;
- cqr->expires = 10 * HZ;
-
- ccw = cqr->cpaddr;
- ccw->cmd_code = DASD_ECKD_CCW_SNSS;
- ccw->count = SNSS_DATA_SIZE;
- ccw->flags = 0;
- ccw->cda = (__u32)(addr_t)cqr->data;
-
- cqr->buildclk = get_clock();
- cqr->status = DASD_CQR_FILLED;
- cqr->callback = dasd_eer_SNSS_cb;
- cqr->callback_data = (void *)device;
- dasd_add_request_head(cqr);
-
- return;
-}
-
-/*
- * This function is called for all triggers. It calls the appropriate
- * function that writes the actual trigger records.
- */
-static int
-dasd_eer_write_trigger(struct dasd_eer_trigger *trigger)
-{
- int rc;
- struct dasd_eer_private *private = trigger->device->eer;
-
- switch (trigger->id) {
- case DASD_EER_FATALERROR:
- case DASD_EER_PPRCSUSPEND:
- rc = dasd_eer_write_standard_trigger(
- trigger->id, trigger->device, trigger->cqr);
- break;
- case DASD_EER_NOPATH:
- rc = dasd_eer_write_standard_trigger(
- trigger->id, trigger->device, NULL);
- break;
- case DASD_EER_STATECHANGE:
- if (queue_work(dasd_eer_workqueue, &private->worker)) {
- rc=0;
- } else {
- /* If the work_struct was already queued, it can't
- * be queued again. But this is OK since we don't
- * need to have it queued twice.
- */
- rc = -EBUSY;
- }
- break;
- default: /* unknown trigger, so we write it without any sense data */
- rc = dasd_eer_write_standard_trigger(
- trigger->id, trigger->device, NULL);
- break;
- }
- return rc;
-}
-
-/*
- * This function is registered with the dasd device driver and gets called
- * for all dasd eer notifications.
- */
-static int dasd_eer_notify(struct notifier_block *self,
- unsigned long action, void *data)
-{
- switch (action) {
- case DASD_EER_DISABLE:
- dasd_eer_disable_on_device((struct dasd_device *)data);
- break;
- case DASD_EER_TRIGGER:
- dasd_eer_write_trigger((struct dasd_eer_trigger *)data);
- break;
- }
- return NOTIFY_OK;
-}
-
-
-/*****************************************************************************/
-/* 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];
-DECLARE_MUTEX(readbuffer_mutex);
-
-
-static int
-dasd_eer_open(struct inode *inp, struct file *filp)
-{
- struct eerbuffer *eerb;
- unsigned long flags;
-
- eerb = kmalloc(sizeof(struct eerbuffer), GFP_KERNEL);
- eerb->head = 0;
- eerb->tail = 0;
- eerb->residual = 0;
- eerb->buffer_page_count = 1;
- eerb->buffersize = eerb->buffer_page_count * PAGE_SIZE;
- eerb->buffer = kmalloc(eerb->buffer_page_count*sizeof(char*),
- GFP_KERNEL);
- if (!eerb->buffer)
- return -ENOMEM;
- if (dasd_eer_allocate_buffer_pages(eerb->buffer,
- eerb->buffer_page_count)) {
- kfree(eerb->buffer);
- 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 long
-dasd_eer_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
-{
- int intval;
- struct eerbuffer *eerb;
-
- eerb = (struct eerbuffer *)filp->private_data;
- switch (cmd) {
- case DASD_EER_PURGE:
- dasd_eer_purge_buffer(eerb);
- return 0;
- case DASD_EER_SETBUFSIZE:
- if (get_user(intval, (int __user *)arg))
- return -EFAULT;
- return dasd_eer_resize_buffer(eerb, intval);
- default:
- return -ENOIOCTLCMD;
- }
-}
-
-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,
- sizeof(tailcount), (char*)(&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, effective_count, readbuffer);
- 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,
- .unlocked_ioctl = &dasd_eer_ioctl,
- .compat_ioctl = &dasd_eer_ioctl,
- .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,
-};
-
-
-/*****************************************************************************/
-/* Init and exit */
-/*****************************************************************************/
-
-static int
-__init dasd_eer_init(void)
-{
- int rc;
-
- dasd_eer_workqueue = create_singlethread_workqueue("dasd_eer");
- if (!dasd_eer_workqueue) {
- MESSAGE(KERN_ERR , "%s", "dasd_eer_init could not "
- "create workqueue \n");
- rc = -ENOMEM;
- goto out;
- }
-
- rc = dasd_register_eer_notifier(&dasd_eer_nb);
- if (rc) {
- MESSAGE(KERN_ERR, "%s", "dasd_eer_init could not "
- "register error reporting");
- goto queue;
- }
-
- dasd_ioctl_no_register(THIS_MODULE, BIODASDEERSET, dasd_ioctl_set_eer);
- dasd_ioctl_no_register(THIS_MODULE, BIODASDEERGET, dasd_ioctl_get_eer);
-
- /* we don't need our own character device,
- * so we just register as misc device */
- rc = misc_register(&dasd_eer_dev);
- if (rc) {
- MESSAGE(KERN_ERR, "%s", "dasd_eer_init could not "
- "register misc device");
- goto unregister;
- }
-
- return 0;
-
-unregister:
- dasd_unregister_eer_notifier(&dasd_eer_nb);
- dasd_ioctl_no_unregister(THIS_MODULE, BIODASDEERSET,
- dasd_ioctl_set_eer);
- dasd_ioctl_no_unregister(THIS_MODULE, BIODASDEERGET,
- dasd_ioctl_get_eer);
-queue:
- destroy_workqueue(dasd_eer_workqueue);
-out:
- return rc;
-
-}
-module_init(dasd_eer_init);
-
-static void
-__exit dasd_eer_exit(void)
-{
- dasd_unregister_eer_notifier(&dasd_eer_nb);
- dasd_ioctl_no_unregister(THIS_MODULE, BIODASDEERSET,
- dasd_ioctl_set_eer);
- dasd_ioctl_no_unregister(THIS_MODULE, BIODASDEERGET,
- dasd_ioctl_get_eer);
- destroy_workqueue(dasd_eer_workqueue);
-
- WARN_ON(misc_deregister(&dasd_eer_dev) != 0);
-}
-module_exit(dasd_eer_exit);
Index: linux-2.6.16-rc2-mm1/drivers/s390/block/dasd_int.h
===================================================================
--- linux-2.6.16-rc2-mm1.orig/drivers/s390/block/dasd_int.h 2006-02-11 16:37:04.000000000 +0100
+++ linux-2.6.16-rc2-mm1/drivers/s390/block/dasd_int.h 2006-02-11 16:52:56.000000000 +0100
@@ -276,34 +276,6 @@
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
-
-/*
- * The dasd_eer_trigger structure contains all data that we need to send
- * along with an DASD_EER_TRIGGER notification.
- */
-struct dasd_eer_trigger {
- unsigned int id;
- struct dasd_device *device;
- struct dasd_ccw_req *cqr;
-};
-
-
struct dasd_device {
/* Block device stuff. */
struct gendisk *gdp;
@@ -317,9 +289,6 @@
unsigned long flags; /* per device flags */
unsigned short features; /* copy of devmap-features (read-only!) */
- /* extended error reporting stuff (eer) */
- void *eer;
-
/* Device discipline stuff. */
struct dasd_discipline *discipline;
char *private;
@@ -520,12 +489,6 @@
int dasd_generic_set_offline (struct ccw_device *cdev);
int dasd_generic_notify(struct ccw_device *, int);
void dasd_generic_auto_online (struct ccw_driver *);
-int dasd_register_eer_notifier(struct notifier_block *);
-int dasd_unregister_eer_notifier(struct notifier_block *);
-void dasd_write_eer_trigger(unsigned int , struct dasd_device *,
- struct dasd_ccw_req *);
-
-
/* externals in dasd_devmap.c */
extern int dasd_max_devindex;
Index: linux-2.6.16-rc2-mm1/include/asm-s390/dasd.h
===================================================================
--- linux-2.6.16-rc2-mm1.orig/include/asm-s390/dasd.h 2006-02-08 16:12:20.000000000 +0100
+++ linux-2.6.16-rc2-mm1/include/asm-s390/dasd.h 2006-02-11 16:52:56.000000000 +0100
@@ -204,8 +204,7 @@
*
* Here ist how the ioctl-nr should be used:
* 0 - 31 DASD driver itself
- * 32 - 229 still open
- * 230 - 239 DASD extended error reporting
+ * 32 - 239 still open
* 240 - 255 reserved for EMC
*******************************************************************************/
@@ -237,22 +236,12 @@
#define BIODASDPSRD _IOR(DASD_IOCTL_LETTER,4,dasd_rssd_perf_stats_t)
/* Get Attributes (cache operations) */
#define BIODASDGATTR _IOR(DASD_IOCTL_LETTER,5,attrib_data_t)
-/* retrieve extended error-reporting value */
-#define BIODASDEERGET _IOR(DASD_IOCTL_LETTER,6,int)
/* #define BIODASDFORMAT _IOW(IOCTL_LETTER,0,format_data_t) , deprecated */
#define BIODASDFMT _IOW(DASD_IOCTL_LETTER,1,format_data_t)
/* Set Attributes (cache operations) */
#define BIODASDSATTR _IOW(DASD_IOCTL_LETTER,2,attrib_data_t)
-/* retrieve extended error-reporting value */
-#define BIODASDEERSET _IOW(DASD_IOCTL_LETTER,3,int)
-
-
-/* remove all records from the eer buffer */
-#define DASD_EER_PURGE _IO(DASD_IOCTL_LETTER,230)
-/* set the number of pages that are used for the internal eer buffer */
-#define DASD_EER_SETBUFSIZE _IOW(DASD_IOCTL_LETTER,230,int)
#endif /* DASD_H */
-
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