[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>
diff --git a/drivers/scsi/libata-core.c b/drivers/scsi/libata-core.c
index 1514cb5..a87748b 100644
--- a/drivers/scsi/libata-core.c
+++ b/drivers/scsi/libata-core.c
@@ -65,8 +65,7 @@
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 @@
/* 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 @@
* @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 @@
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 @@
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 @@
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;