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[PATCH] libata: add per-dev pio/mwdma/udma_mask 

Add per-dev pio/mwdma/udma_mask.  All transfer mode limits used to be
applied to ap->*_mask which unnecessarily restricted other devices
sharing the port.  This change will also benefit later EH speed down
and hotplug.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Tejun Heo 2006-03-24 14:07:50 +09:00 committed by Jeff Garzik
parent c0489e4efc
commit acf356b12d
2 changed files with 30 additions and 18 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

43
drivers/scsi/libata-core.c
View File

@ -65,8 +65,7 @@ static unsigned int ata_dev_init_params(struct ata_port *ap,
struct ata_device *dev);
static void ata_set_mode(struct ata_port *ap);
static void ata_dev_set_xfermode(struct ata_port *ap, struct ata_device *dev);
static unsigned int ata_dev_xfermask(struct ata_port *ap,
struct ata_device *dev);
static void ata_dev_xfermask(struct ata_port *ap, struct ata_device *dev);
static unsigned int ata_unique_id = 1;
static struct workqueue_struct *ata_wq;
@ -1801,16 +1800,19 @@ static void ata_set_mode(struct ata_port *ap)
/* step 1: calculate xfer_mask */
for (i = 0; i < ATA_MAX_DEVICES; i++) {
struct ata_device *dev = &ap->device[i];
unsigned int xfer_mask;
unsigned int pio_mask, dma_mask;
if (!ata_dev_present(dev))
continue;
xfer_mask = ata_dev_xfermask(ap, dev);
ata_dev_xfermask(ap, dev);
dev->pio_mode = ata_xfer_mask2mode(xfer_mask & ATA_MASK_PIO);
dev->dma_mode = ata_xfer_mask2mode(xfer_mask & (ATA_MASK_MWDMA |
ATA_MASK_UDMA));
/* TODO: let LLDD filter dev->*_mask here */
pio_mask = ata_pack_xfermask(dev->pio_mask, 0, 0);
dma_mask = ata_pack_xfermask(0, dev->mwdma_mask, dev->udma_mask);
dev->pio_mode = ata_xfer_mask2mode(pio_mask);
dev->dma_mode = ata_xfer_mask2mode(dma_mask);
}
/* step 2: always set host PIO timings */
@ -2653,18 +2655,15 @@ static int ata_dma_blacklisted(const struct ata_device *dev)
* @ap: Port on which the device to compute xfermask for resides
* @dev: Device to compute xfermask for
*
* Compute supported xfermask of @dev. This function is
* responsible for applying all known limits including host
* controller limits, device blacklist, etc...
* Compute supported xfermask of @dev and store it in
* dev->*_mask. This function is responsible for applying all
* known limits including host controller limits, device
* blacklist, etc...
*
* LOCKING:
* None.
*
* RETURNS:
* Computed xfermask.
*/
static unsigned int ata_dev_xfermask(struct ata_port *ap,
struct ata_device *dev)
static void ata_dev_xfermask(struct ata_port *ap, struct ata_device *dev)
{
unsigned long xfer_mask;
int i;
@ -2677,6 +2676,8 @@ static unsigned int ata_dev_xfermask(struct ata_port *ap,
struct ata_device *d = &ap->device[i];
if (!ata_dev_present(d))
continue;
xfer_mask &= ata_pack_xfermask(d->pio_mask, d->mwdma_mask,
d->udma_mask);
xfer_mask &= ata_id_xfermask(d->id);
if (ata_dma_blacklisted(d))
xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
@ -2686,7 +2687,8 @@ static unsigned int ata_dev_xfermask(struct ata_port *ap,
printk(KERN_WARNING "ata%u: dev %u is on DMA blacklist, "
"disabling DMA\n", ap->id, dev->devno);
return xfer_mask;
ata_unpack_xfermask(xfer_mask, &dev->pio_mask, &dev->mwdma_mask,
&dev->udma_mask);
}
/**
@ -4436,8 +4438,13 @@ static void ata_host_init(struct ata_port *ap, struct Scsi_Host *host,
INIT_WORK(&ap->port_task, NULL, NULL);
INIT_LIST_HEAD(&ap->eh_done_q);
for (i = 0; i < ATA_MAX_DEVICES; i++)
ap->device[i].devno = i;
for (i = 0; i < ATA_MAX_DEVICES; i++) {
struct ata_device *dev = &ap->device[i];
dev->devno = i;
dev->pio_mask = UINT_MAX;
dev->mwdma_mask = UINT_MAX;
dev->udma_mask = UINT_MAX;
}
#ifdef ATA_IRQ_TRAP
ap->stats.unhandled_irq = 1;

5
include/linux/libata.h
View File

@ -358,6 +358,11 @@ struct ata_device {
unsigned int max_sectors; /* per-device max sectors */
unsigned int cdb_len;
/* per-dev xfer mask */
unsigned int pio_mask;
unsigned int mwdma_mask;
unsigned int udma_mask;
/* for CHS addressing */
u16 cylinders; /* Number of cylinders */
u16 heads; /* Number of heads */