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libata-pmp: hook PMP support and enable it
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Hook PMP support into libata and enable it.  Connect SCR and probing
functions, and update ata_dev_classify() to detect PMP.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
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@htejun
htejun authored and Jeff Garzik committed Oct 12, 2007
1 parent 3af9a77 commit 633273a
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Showing 3 changed files with 96 additions and 35 deletions.
111 changes: 80 additions & 31 deletions drivers/ata/libata-core.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -670,29 +670,49 @@ static unsigned int ata_devchk(struct ata_port *ap, unsigned int device)
* None.
*
* RETURNS:
* Device type, %ATA_DEV_ATA, %ATA_DEV_ATAPI, or %ATA_DEV_UNKNOWN
* the event of failure.
* Device type, %ATA_DEV_ATA, %ATA_DEV_ATAPI, %ATA_DEV_PMP or
* %ATA_DEV_UNKNOWN the event of failure.
*/

unsigned int ata_dev_classify(const struct ata_taskfile *tf)
{
/* Apple's open source Darwin code hints that some devices only
* put a proper signature into the LBA mid/high registers,
* So, we only check those. It's sufficient for uniqueness.
*
* ATA/ATAPI-7 (d1532v1r1: Feb. 19, 2003) specified separate
* signatures for ATA and ATAPI devices attached on SerialATA,
* 0x3c/0xc3 and 0x69/0x96 respectively. However, SerialATA
* spec has never mentioned about using different signatures
* for ATA/ATAPI devices. Then, Serial ATA II: Port
* Multiplier specification began to use 0x69/0x96 to identify
* port multpliers and 0x3c/0xc3 to identify SEMB device.
* ATA/ATAPI-7 dropped descriptions about 0x3c/0xc3 and
* 0x69/0x96 shortly and described them as reserved for
* SerialATA.
*
* We follow the current spec and consider that 0x69/0x96
* identifies a port multiplier and 0x3c/0xc3 a SEMB device.
*/

if (((tf->lbam == 0) && (tf->lbah == 0)) ||
((tf->lbam == 0x3c) && (tf->lbah == 0xc3))) {
if ((tf->lbam == 0) && (tf->lbah == 0)) {
DPRINTK("found ATA device by sig\n");
return ATA_DEV_ATA;
}

if (((tf->lbam == 0x14) && (tf->lbah == 0xeb)) ||
((tf->lbam == 0x69) && (tf->lbah == 0x96))) {
if ((tf->lbam == 0x14) && (tf->lbah == 0xeb)) {
DPRINTK("found ATAPI device by sig\n");
return ATA_DEV_ATAPI;
}

if ((tf->lbam == 0x69) && (tf->lbah == 0x96)) {
DPRINTK("found PMP device by sig\n");
return ATA_DEV_PMP;
}

if ((tf->lbam == 0x3c) && (tf->lbah == 0xc3)) {
printk("ata: SEMB device ignored\n");
return ATA_DEV_SEMB_UNSUP; /* not yet */
}

DPRINTK("unknown device\n");
return ATA_DEV_UNKNOWN;
}
Expand Down Expand Up @@ -3426,6 +3446,12 @@ int ata_std_prereset(struct ata_link *link, unsigned long deadline)
(link->flags & ATA_LFLAG_HRST_TO_RESUME))
ehc->i.action |= ATA_EH_HARDRESET;

/* Some PMPs don't work with only SRST, force hardreset if PMP
* is supported.
*/
if (ap->flags & ATA_FLAG_PMP)
ehc->i.action |= ATA_EH_HARDRESET;

/* if we're about to do hardreset, nothing more to do */
if (ehc->i.action & ATA_EH_HARDRESET)
return 0;
Expand Down Expand Up @@ -3616,6 +3642,16 @@ int sata_std_hardreset(struct ata_link *link, unsigned int *class,
/* wait a while before checking status, see SRST for more info */
msleep(150);

/* If PMP is supported, we have to do follow-up SRST. Note
* that some PMPs don't send D2H Reg FIS after hardreset at
* all if the first port is empty. Wait for it just for a
* second and request follow-up SRST.
*/
if (ap->flags & ATA_FLAG_PMP) {
ata_wait_ready(ap, jiffies + HZ);
return -EAGAIN;
}

rc = ata_wait_ready(ap, deadline);
/* link occupied, -ENODEV too is an error */
if (rc) {
Expand Down Expand Up @@ -5966,22 +6002,26 @@ int sata_scr_valid(struct ata_link *link)
* @val: Place to store read value
*
* Read SCR register @reg of @link into *@val. This function is
* guaranteed to succeed if the cable type of the port is SATA
* and the port implements ->scr_read.
* guaranteed to succeed if @link is ap->link, the cable type of
* the port is SATA and the port implements ->scr_read.
*
* LOCKING:
* None.
* None if @link is ap->link. Kernel thread context otherwise.
*
* RETURNS:
* 0 on success, negative errno on failure.
*/
int sata_scr_read(struct ata_link *link, int reg, u32 *val)
{
struct ata_port *ap = link->ap;
if (ata_is_host_link(link)) {
struct ata_port *ap = link->ap;

if (sata_scr_valid(link))
return ap->ops->scr_read(ap, reg, val);
return -EOPNOTSUPP;
if (sata_scr_valid(link))
return ap->ops->scr_read(ap, reg, val);
return -EOPNOTSUPP;
}

return sata_pmp_scr_read(link, reg, val);
}

/**
Expand All @@ -5991,22 +6031,26 @@ int sata_scr_read(struct ata_link *link, int reg, u32 *val)
* @val: value to write
*
* Write @val to SCR register @reg of @link. This function is
* guaranteed to succeed if the cable type of the port is SATA
* and the port implements ->scr_read.
* guaranteed to succeed if @link is ap->link, the cable type of
* the port is SATA and the port implements ->scr_read.
*
* LOCKING:
* None.
* None if @link is ap->link. Kernel thread context otherwise.
*
* RETURNS:
* 0 on success, negative errno on failure.
*/
int sata_scr_write(struct ata_link *link, int reg, u32 val)
{
struct ata_port *ap = link->ap;
if (ata_is_host_link(link)) {
struct ata_port *ap = link->ap;

if (sata_scr_valid(link))
return ap->ops->scr_write(ap, reg, val);
return -EOPNOTSUPP;
if (sata_scr_valid(link))
return ap->ops->scr_write(ap, reg, val);
return -EOPNOTSUPP;
}

return sata_pmp_scr_write(link, reg, val);
}

/**
Expand All @@ -6019,23 +6063,27 @@ int sata_scr_write(struct ata_link *link, int reg, u32 val)
* function performs flush after writing to the register.
*
* LOCKING:
* None.
* None if @link is ap->link. Kernel thread context otherwise.
*
* RETURNS:
* 0 on success, negative errno on failure.
*/
int sata_scr_write_flush(struct ata_link *link, int reg, u32 val)
{
struct ata_port *ap = link->ap;
int rc;
if (ata_is_host_link(link)) {
struct ata_port *ap = link->ap;
int rc;

if (sata_scr_valid(link)) {
rc = ap->ops->scr_write(ap, reg, val);
if (rc == 0)
rc = ap->ops->scr_read(ap, reg, &val);
return rc;
if (sata_scr_valid(link)) {
rc = ap->ops->scr_write(ap, reg, val);
if (rc == 0)
rc = ap->ops->scr_read(ap, reg, &val);
return rc;
}
return -EOPNOTSUPP;
}
return -EOPNOTSUPP;

return sata_pmp_scr_write(link, reg, val);
}

/**
Expand Down Expand Up @@ -6424,6 +6472,7 @@ static void ata_host_release(struct device *gendev, void *res)
if (ap->scsi_host)
scsi_host_put(ap->scsi_host);

kfree(ap->pmp_link);
kfree(ap);
host->ports[i] = NULL;
}
Expand Down
18 changes: 15 additions & 3 deletions drivers/ata/libata-eh.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -2209,6 +2209,8 @@ static int ata_eh_revalidate_and_attach(struct ata_link *link,
readid_flags |= ATA_READID_POSTRESET;

if ((action & ATA_EH_REVALIDATE) && ata_dev_enabled(dev)) {
WARN_ON(dev->class == ATA_DEV_PMP);

if (ata_link_offline(link)) {
rc = -EIO;
goto err;
Expand All @@ -2234,8 +2236,11 @@ static int ata_eh_revalidate_and_attach(struct ata_link *link,
ata_class_enabled(ehc->classes[dev->devno])) {
dev->class = ehc->classes[dev->devno];

rc = ata_dev_read_id(dev, &dev->class, readid_flags,
dev->id);
if (dev->class == ATA_DEV_PMP)
rc = sata_pmp_attach(dev);
else
rc = ata_dev_read_id(dev, &dev->class,
readid_flags, dev->id);
switch (rc) {
case 0:
new_mask |= 1 << dev->devno;
Expand Down Expand Up @@ -2264,7 +2269,8 @@ static int ata_eh_revalidate_and_attach(struct ata_link *link,
* device detection messages backwards.
*/
ata_link_for_each_dev(dev, link) {
if (!(new_mask & (1 << dev->devno)))
if (!(new_mask & (1 << dev->devno)) ||
dev->class == ATA_DEV_PMP)
continue;

ehc->i.flags |= ATA_EHI_PRINTINFO;
Expand Down Expand Up @@ -2521,6 +2527,12 @@ int ata_eh_recover(struct ata_port *ap, ata_prereset_fn_t prereset,
if (rc)
goto dev_fail;

/* if PMP got attached, return, pmp EH will take care of it */
if (link->device->class == ATA_DEV_PMP) {
ehc->i.action = 0;
return 0;
}

/* configure transfer mode if necessary */
if (ehc->i.flags & ATA_EHI_SETMODE) {
rc = ata_set_mode(link, &dev);
Expand Down
2 changes: 1 addition & 1 deletion drivers/ata/libata.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -29,7 +29,7 @@
#define __LIBATA_H__

#define DRV_NAME "libata"
#define DRV_VERSION "2.21" /* must be exactly four chars */
#define DRV_VERSION "3.00" /* must be exactly four chars */

struct ata_scsi_args {
struct ata_device *dev;
Expand Down

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