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[libata] add DMA setup FIS auto-activate feature

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Hopefully results in fewer on-the-wire FIS's and no breakage.  We'll see!

Signed-off-by: Shaohua Li <shaohua.li@intel.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
This commit is contained in:
Shaohua Li
2009-07-27 09:24:35 +08:00
committed by Jeff Garzik
parent 2fc37adba0
commit 388539f3ff
4 changed files with 36 additions and 8 deletions
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36
drivers/ata/libata-core.c
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@@ -2299,29 +2299,49 @@ static inline u8 ata_dev_knobble(struct ata_device *dev)
return ((ap->cbl == ATA_CBL_SATA) && (!ata_id_is_sata(dev->id)));
}
static void ata_dev_config_ncq(struct ata_device *dev,
static int ata_dev_config_ncq(struct ata_device *dev,
char *desc, size_t desc_sz)
{
struct ata_port *ap = dev->link->ap;
int hdepth = 0, ddepth = ata_id_queue_depth(dev->id);
unsigned int err_mask;
char *aa_desc = "";
if (!ata_id_has_ncq(dev->id)) {
desc[0] = '\0';
return;
return 0;
}
if (dev->horkage & ATA_HORKAGE_NONCQ) {
snprintf(desc, desc_sz, "NCQ (not used)");
return;
return 0;
}
if (ap->flags & ATA_FLAG_NCQ) {
hdepth = min(ap->scsi_host->can_queue, ATA_MAX_QUEUE - 1);
dev->flags |= ATA_DFLAG_NCQ;
}
if (!(dev->horkage & ATA_HORKAGE_BROKEN_FPDMA_AA) &&
(ap->flags & ATA_FLAG_FPDMA_AA) &&
ata_id_has_fpdma_aa(dev->id)) {
err_mask = ata_dev_set_feature(dev, SETFEATURES_SATA_ENABLE,
SATA_FPDMA_AA);
if (err_mask) {
ata_dev_printk(dev, KERN_ERR, "failed to enable AA"
"(error_mask=0x%x)\n", err_mask);
if (err_mask != AC_ERR_DEV) {
dev->horkage |= ATA_HORKAGE_BROKEN_FPDMA_AA;
return -EIO;
}
} else
aa_desc = ", AA";
}
if (hdepth >= ddepth)
snprintf(desc, desc_sz, "NCQ (depth %d)", ddepth);
snprintf(desc, desc_sz, "NCQ (depth %d)%s", ddepth, aa_desc);
else
snprintf(desc, desc_sz, "NCQ (depth %d/%d)", hdepth, ddepth);
snprintf(desc, desc_sz, "NCQ (depth %d/%d)%s", hdepth,
ddepth, aa_desc);
return 0;
}
/**
@@ -2461,7 +2481,7 @@ int ata_dev_configure(struct ata_device *dev)
if (ata_id_has_lba(id)) {
const char *lba_desc;
char ncq_desc[20];
char ncq_desc[24];
lba_desc = "LBA";
dev->flags |= ATA_DFLAG_LBA;
@@ -2475,7 +2495,9 @@ int ata_dev_configure(struct ata_device *dev)
}
/* config NCQ */
ata_dev_config_ncq(dev, ncq_desc, sizeof(ncq_desc));
rc = ata_dev_config_ncq(dev, ncq_desc, sizeof(ncq_desc));
if (rc)
return rc;
/* print device info to dmesg */
if (ata_msg_drv(ap) && print_info) {