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ide: add helpers for preparing sense requests 

This is in preparation of removing the queueing of a sense request out
of the IRQ handler path.

Use struct request_sense as a general sense buffer for all ATAPI
devices ide-{floppy,tape,cd}.

tj: * blk_get_request(__GFP_WAIT) can't be called from do_request() as
      it can cause deadlock.  Converted to use inline struct request
      and blk_rq_init().

    * Added xfer / cdb len selection depending on device type.

    * All sense prep logics folded into ide_prep_sense() which never
      fails.

    * hwif->rq clearing and sense_rq used handling moved into
      ide_queue_sense_rq().

    * blk_rq_map_kern() conversion is moved to later patch.

CC: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
CC: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Signed-off-by: Borislav Petkov <petkovbb@gmail.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Borislav Petkov 2009-04-19 07:00:42 +09:00 committed by Jens Axboe
parent 1f181d2b15
commit e69d800f7e
2 changed files with 72 additions and 0 deletions
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61
drivers/ide/ide-atapi.c
View File

@ -191,6 +191,67 @@ void ide_create_request_sense_cmd(ide_drive_t *drive, struct ide_atapi_pc *pc)
}
EXPORT_SYMBOL_GPL(ide_create_request_sense_cmd);
void ide_prep_sense(ide_drive_t *drive, struct request *rq)
{
struct request_sense *sense = &drive->sense_data;
struct request *sense_rq = &drive->sense_rq;
unsigned int cmd_len, sense_len;
debug_log("%s: enter\n", __func__);
switch (drive->media) {
case ide_floppy:
cmd_len = 255;
sense_len = 18;
break;
case ide_tape:
cmd_len = 20;
sense_len = 20;
break;
default:
cmd_len = 18;
sense_len = 18;
}
BUG_ON(sense_len > sizeof(*sense));
if (blk_sense_request(rq) || drive->sense_rq_armed)
return;
memset(sense, 0, sizeof(*sense));
blk_rq_init(rq->q, sense_rq);
sense_rq->rq_disk = rq->rq_disk;
sense_rq->data = sense;
sense_rq->cmd[0] = GPCMD_REQUEST_SENSE;
sense_rq->cmd[4] = cmd_len;
sense_rq->data_len = sense_len;
sense_rq->cmd_type = REQ_TYPE_SENSE;
sense_rq->cmd_flags |= REQ_PREEMPT;
if (drive->media == ide_tape)
sense_rq->cmd[13] = REQ_IDETAPE_PC1;
drive->sense_rq_armed = true;
}
EXPORT_SYMBOL_GPL(ide_prep_sense);
void ide_queue_sense_rq(ide_drive_t *drive, void *special)
{
BUG_ON(!drive->sense_rq_armed);
drive->sense_rq.special = special;
drive->sense_rq_armed = false;
drive->hwif->rq = NULL;
elv_add_request(drive->queue, &drive->sense_rq,
ELEVATOR_INSERT_FRONT, 0);
}
EXPORT_SYMBOL_GPL(ide_queue_sense_rq);
/*
* Called when an error was detected during the last packet command.
* We queue a request sense packet command in the head of the request list.

11
include/linux/ide.h
View File

@ -26,6 +26,9 @@
#include <asm/io.h>
#include <asm/mutex.h>
/* for request_sense */
#include <linux/cdrom.h>
#if defined(CONFIG_CRIS) || defined(CONFIG_FRV) || defined(CONFIG_MN10300)
# define SUPPORT_VLB_SYNC 0
#else
@ -602,6 +605,11 @@ struct ide_drive_s {
struct ide_atapi_pc request_sense_pc;
struct request request_sense_rq;
/* current sense rq and buffer */
bool sense_rq_armed;
struct request sense_rq;
struct request_sense sense_data;
};
typedef struct ide_drive_s ide_drive_t;
@ -1175,6 +1183,9 @@ int ide_set_media_lock(ide_drive_t *, struct gendisk *, int);
void ide_create_request_sense_cmd(ide_drive_t *, struct ide_atapi_pc *);
void ide_retry_pc(ide_drive_t *, struct gendisk *);
void ide_prep_sense(ide_drive_t *drive, struct request *rq);
void ide_queue_sense_rq(ide_drive_t *drive, void *special);
int ide_cd_expiry(ide_drive_t *);
int ide_cd_get_xferlen(struct request *);