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[PATCH] libata: add per-device max_sectors 

If a low level driver wants to control max_sectors, it had to adjust
ap->host->max_sectors and set ATA_DFLAG_LOCK_SECTORS to tell
ata_scsi_slave_config not to override the limit.  This is not only
cumbersome but also incorrect for hosts which support more than one
devices per port.

This patch adds per-device ->max_sectors.  If the field is unset
(zero), libata core layer will adjust ->max_sectors according to
default rules.  If the field is set, libata honors the setting.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>
This commit is contained in:
Tejun Heo 2006-02-12 23:32:59 +09:00 committed by Jeff Garzik
parent 6e7846e9c5
commit b00eec1d58
4 changed files with 13 additions and 17 deletions
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4
drivers/scsi/libata-core.c
View File

@ -1147,9 +1147,7 @@ void ata_dev_config(struct ata_port *ap, unsigned int i)
printk(KERN_INFO "ata%u(%u): applying bridge limits\n",
ap->id, i);
ap->udma_mask &= ATA_UDMA5;
ap->host->max_sectors = ATA_MAX_SECTORS;
ap->host->hostt->max_sectors = ATA_MAX_SECTORS;
ap->device[i].flags |= ATA_DFLAG_LOCK_SECTORS;
ap->device[i].max_sectors = ATA_MAX_SECTORS;
}
if (ap->ops->dev_config)

18
drivers/scsi/libata-scsi.c
View File

@ -684,23 +684,23 @@ int ata_scsi_slave_config(struct scsi_device *sdev)
if (sdev->id < ATA_MAX_DEVICES) {
struct ata_port *ap;
struct ata_device *dev;
unsigned int max_sectors;
ap = (struct ata_port *) &sdev->host->hostdata[0];
dev = &ap->device[sdev->id];
/* TODO: 1024 is an arbitrary number, not the
/* TODO: 2048 is an arbitrary number, not the
* hardware maximum. This should be increased to
* 65534 when Jens Axboe's patch for dynamically
* determining max_sectors is merged.
*/
if ((dev->flags & ATA_DFLAG_LBA48) &&
((dev->flags & ATA_DFLAG_LOCK_SECTORS) == 0)) {
/*
* do not overwrite sdev->host->max_sectors, since
* other drives on this host may not support LBA48
*/
blk_queue_max_sectors(sdev->request_queue, 2048);
}
max_sectors = ATA_MAX_SECTORS;
if (dev->flags & ATA_DFLAG_LBA48)
max_sectors = 2048;
if (dev->max_sectors)
max_sectors = dev->max_sectors;
blk_queue_max_sectors(sdev->request_queue, max_sectors);
/*
* SATA DMA transfers must be multiples of 4 byte, so

4
drivers/scsi/sata_sil.c
View File

@ -354,9 +354,7 @@ static void sil_dev_config(struct ata_port *ap, struct ata_device *dev)
(quirks & SIL_QUIRK_MOD15WRITE))) {
printk(KERN_INFO "ata%u(%u): applying Seagate errata fix (mod15write workaround)\n",
ap->id, dev->devno);
ap->host->max_sectors = 15;
ap->host->hostt->max_sectors = 15;
dev->flags |= ATA_DFLAG_LOCK_SECTORS;
dev->max_sectors = 15;
return;
}

4
include/linux/libata.h
View File

@ -122,8 +122,7 @@ enum {
/* struct ata_device stuff */
ATA_DFLAG_LBA48 = (1 << 0), /* device supports LBA48 */
ATA_DFLAG_PIO = (1 << 1), /* device currently in PIO mode */
ATA_DFLAG_LOCK_SECTORS = (1 << 2), /* don't adjust max_sectors */
ATA_DFLAG_LBA = (1 << 3), /* device supports LBA */
ATA_DFLAG_LBA = (1 << 2), /* device supports LBA */
ATA_DEV_UNKNOWN = 0, /* unknown device */
ATA_DEV_ATA = 1, /* ATA device */
@ -348,6 +347,7 @@ struct ata_device {
unsigned int multi_count; /* sectors count for
READ/WRITE MULTIPLE */
unsigned int max_sectors; /* per-device max sectors */
unsigned int cdb_len;
/* for CHS addressing */