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libata: move generic hardreset code from sata_sff_hardreset() to sata_link_hardreset() 

sata_sff_hardreset() contains link readiness wait logic which isn't
SFF specific.  Move that part into sata_link_hardreset(), which now
takes two more parameters - @online and @check_ready.  Both are
optional.  The former is out parameter for link onlineness after
reset.  The latter is used to wait for link readiness after hardreset.

Users of sata_link_hardreset() is updated to use new funtionality and
ahci_hardreset() is updated to use sata_link_hardreset() instead of
sata_sff_hardreset().  This doesn't really cause any behavior change.

Signed-off-by: Tejun Heo <htejun@gmail.com>
This commit is contained in:
Tejun Heo 2008-04-07 22:47:19 +09:00 committed by Jeff Garzik
parent a89611e848
commit 9dadd45b24
6 changed files with 92 additions and 61 deletions
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35
drivers/ata/ahci.c
View File

@ -1343,10 +1343,12 @@ static int ahci_softreset(struct ata_link *link, unsigned int *class,
static int ahci_hardreset(struct ata_link *link, unsigned int *class,
unsigned long deadline)
{
const unsigned long *timing = sata_ehc_deb_timing(&link->eh_context);
struct ata_port *ap = link->ap;
struct ahci_port_priv *pp = ap->private_data;
u8 *d2h_fis = pp->rx_fis + RX_FIS_D2H_REG;
struct ata_taskfile tf;
bool online;
int rc;
DPRINTK("ENTER\n");
@ -1358,14 +1360,14 @@ static int ahci_hardreset(struct ata_link *link, unsigned int *class,
tf.command = 0x80;
ata_tf_to_fis(&tf, 0, 0, d2h_fis);
rc = sata_sff_hardreset(link, class, deadline);
rc = sata_link_hardreset(link, timing, deadline, &online,
ahci_check_ready);
ahci_start_engine(ap);
if (rc == 0 && ata_link_online(link))
*class = ATA_DEV_NONE;
if (online)
*class = ahci_dev_classify(ap);
if (rc != -EAGAIN && *class == ATA_DEV_UNKNOWN)
*class = ATA_DEV_NONE;
DPRINTK("EXIT, rc=%d, class=%u\n", rc, *class);
return rc;
@ -1376,6 +1378,7 @@ static int ahci_vt8251_hardreset(struct ata_link *link, unsigned int *class,
{
struct ata_port *ap = link->ap;
u32 serror;
bool online;
int rc;
DPRINTK("ENTER\n");
@ -1383,7 +1386,7 @@ static int ahci_vt8251_hardreset(struct ata_link *link, unsigned int *class,
ahci_stop_engine(ap);
rc = sata_link_hardreset(link, sata_ehc_deb_timing(&link->eh_context),
deadline);
deadline, &online, NULL);
/* vt8251 needs SError cleared for the port to operate */
ahci_scr_read(ap, SCR_ERROR, &serror);
@ -1396,7 +1399,8 @@ static int ahci_vt8251_hardreset(struct ata_link *link, unsigned int *class,
/* vt8251 doesn't clear BSY on signature FIS reception,
* request follow-up softreset.
*/
return rc ?: -EAGAIN;
*class = ATA_DEV_NONE;
return online ? -EAGAIN : rc;
}
static int ahci_p5wdh_hardreset(struct ata_link *link, unsigned int *class,
@ -1406,6 +1410,7 @@ static int ahci_p5wdh_hardreset(struct ata_link *link, unsigned int *class,
struct ahci_port_priv *pp = ap->private_data;
u8 *d2h_fis = pp->rx_fis + RX_FIS_D2H_REG;
struct ata_taskfile tf;
bool online;
int rc;
ahci_stop_engine(ap);
@ -1416,13 +1421,10 @@ static int ahci_p5wdh_hardreset(struct ata_link *link, unsigned int *class,
ata_tf_to_fis(&tf, 0, 0, d2h_fis);
rc = sata_link_hardreset(link, sata_ehc_deb_timing(&link->eh_context),
deadline);
deadline, &online, NULL);
ahci_start_engine(ap);
if (rc || ata_link_offline(link))
return rc;
/* The pseudo configuration device on SIMG4726 attached to
* ASUS P5W-DH Deluxe doesn't send signature FIS after
* hardreset if no device is attached to the first downstream
@ -1436,11 +1438,14 @@ static int ahci_p5wdh_hardreset(struct ata_link *link, unsigned int *class,
* have to be reset again. For most cases, this should
* suffice while making probing snappish enough.
*/
rc = ata_wait_after_reset(link, jiffies + 2 * HZ, ahci_check_ready);
if (rc)
ahci_kick_engine(ap, 0);
return 0;
if (online) {
rc = ata_wait_after_reset(link, jiffies + 2 * HZ,
ahci_check_ready);
if (rc)
ahci_kick_engine(ap, 0);
}
*class = ATA_DEV_NONE;
return rc;
}
static void ahci_postreset(struct ata_link *link, unsigned int *class)

2
drivers/ata/ata_piix.c
View File

@ -1022,7 +1022,7 @@ static int piix_sidpr_hardreset(struct ata_link *link, unsigned int *class,
int rc;
/* do hardreset */
rc = sata_link_hardreset(link, timing, deadline);
rc = sata_link_hardreset(link, timing, deadline, NULL, NULL);
if (rc) {
ata_link_printk(link, KERN_ERR,
"COMRESET failed (errno=%d)\n", rc);

50
drivers/ata/libata-core.c
View File

@ -3557,8 +3557,18 @@ int ata_std_prereset(struct ata_link *link, unsigned long deadline)
* @link: link to reset
* @timing: timing parameters { interval, duratinon, timeout } in msec
* @deadline: deadline jiffies for the operation
* @online: optional out parameter indicating link onlineness
* @check_ready: optional callback to check link readiness
*
* SATA phy-reset @link using DET bits of SControl register.
* After hardreset, link readiness is waited upon using
* ata_wait_ready() if @check_ready is specified. LLDs are
* allowed to not specify @check_ready and wait itself after this
* function returns. Device classification is LLD's
* responsibility.
*
* *@online is set to one iff reset succeeded and @link is online
* after reset.
*
* LOCKING:
* Kernel thread context (may sleep)
@ -3567,13 +3577,17 @@ int ata_std_prereset(struct ata_link *link, unsigned long deadline)
* 0 on success, -errno otherwise.
*/
int sata_link_hardreset(struct ata_link *link, const unsigned long *timing,
unsigned long deadline)
unsigned long deadline,
bool *online, int (*check_ready)(struct ata_link *))
{
u32 scontrol;
int rc;
DPRINTK("ENTER\n");
if (online)
*online = false;
if (sata_set_spd_needed(link)) {
/* SATA spec says nothing about how to reconfigure
* spd. To be on the safe side, turn off phy during
@ -3607,7 +3621,41 @@ int sata_link_hardreset(struct ata_link *link, const unsigned long *timing,
/* bring link back */
rc = sata_link_resume(link, timing, deadline);
if (rc)
goto out;
/* if link is offline nothing more to do */
if (ata_link_offline(link))
goto out;
/* Link is online. From this point, -ENODEV too is an error. */
if (online)
*online = true;
if ((link->ap->flags & ATA_FLAG_PMP) && ata_is_host_link(link)) {
/* If PMP is supported, we have to do follow-up SRST.
* Some PMPs don't send D2H Reg FIS after hardreset if
* the first port is empty. Wait only for
* ATA_TMOUT_PMP_SRST_WAIT.
*/
if (check_ready) {
unsigned long pmp_deadline;
pmp_deadline = jiffies + ATA_TMOUT_PMP_SRST_WAIT;
if (time_after(pmp_deadline, deadline))
pmp_deadline = deadline;
ata_wait_ready(link, pmp_deadline, check_ready);
}
rc = -EAGAIN;
goto out;
}
rc = 0;
if (check_ready)
rc = ata_wait_ready(link, deadline, check_ready);
out:
if (rc && rc != -EAGAIN)
ata_link_printk(link, KERN_ERR,
"COMRESET failed (errno=%d)\n", rc);
DPRINTK("EXIT, rc=%d\n", rc);
return rc;
}

7
drivers/ata/libata-pmp.c
View File

@ -239,13 +239,14 @@ int sata_pmp_std_hardreset(struct ata_link *link, unsigned int *class,
unsigned long deadline)
{
const unsigned long *timing = sata_ehc_deb_timing(&link->eh_context);
bool online;
u32 tmp;
int rc;
DPRINTK("ENTER\n");
/* do hardreset */
rc = sata_link_hardreset(link, timing, deadline);
rc = sata_link_hardreset(link, timing, deadline, &online, NULL);
if (rc) {
ata_link_printk(link, KERN_ERR,
"COMRESET failed (errno=%d)\n", rc);
@ -261,7 +262,7 @@ int sata_pmp_std_hardreset(struct ata_link *link, unsigned int *class,
}
/* if device is present, follow up with srst to wait for !BSY */
if (ata_link_online(link))
if (online)
rc = -EAGAIN;
out:
/* if SCR isn't accessible, we need to reset the PMP */
@ -916,7 +917,7 @@ static int sata_pmp_eh_handle_disabled_links(struct ata_port *ap)
* SError.N working.
*/
sata_link_hardreset(link, sata_deb_timing_normal,
jiffies + ATA_TMOUT_INTERNAL_QUICK);
jiffies + ATA_TMOUT_INTERNAL_QUICK, NULL, NULL);
/* unconditionally clear SError.N */
rc = sata_scr_write(link, SCR_ERROR, SERR_PHYRDY_CHG);

49
drivers/ata/libata-sff.c
View File

@ -1921,50 +1921,19 @@ int ata_sff_softreset(struct ata_link *link, unsigned int *classes,
int sata_sff_hardreset(struct ata_link *link, unsigned int *class,
unsigned long deadline)
{
struct ata_port *ap = link->ap;
const unsigned long *timing = sata_ehc_deb_timing(&link->eh_context);
struct ata_eh_context *ehc = &link->eh_context;
const unsigned long *timing = sata_ehc_deb_timing(ehc);
bool online;
int rc;
DPRINTK("ENTER\n");
/* do hardreset */
rc = sata_link_hardreset(link, timing, deadline);
if (rc) {
ata_link_printk(link, KERN_ERR,
"COMRESET failed (errno=%d)\n", rc);
return rc;
}
/* TODO: phy layer with polling, timeouts, etc. */
if (ata_link_offline(link)) {
*class = ATA_DEV_NONE;
DPRINTK("EXIT, link offline\n");
return 0;
}
/* 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_sff_wait_after_reset(link, 1, jiffies + HZ);
return -EAGAIN;
}
/* wait for the link to become online */
rc = ata_sff_wait_after_reset(link, 1, deadline);
/* link occupied, -ENODEV too is an error */
if (rc) {
ata_link_printk(link, KERN_ERR,
"COMRESET failed (errno=%d)\n", rc);
return rc;
}
*class = ata_sff_dev_classify(link->device, 1, NULL);
rc = sata_link_hardreset(link, timing, deadline, &online,
ata_sff_check_ready);
*class = ATA_DEV_NONE;
if (online)
*class = ata_sff_dev_classify(link->device, 1, NULL);
DPRINTK("EXIT, class=%u\n", *class);
return 0;
return rc;
}
/**

10
include/linux/libata.h
View File

@ -261,6 +261,13 @@ enum {
*/
ATA_WAIT_AFTER_RESET_MSECS = 150,
/* If PMP is supported, we have to do follow-up SRST. As some
* PMPs don't send D2H Reg FIS after hardreset, LLDs are
* advised to wait only for the following duration before
* doing SRST.
*/
ATA_TMOUT_PMP_SRST_WAIT = 1 * HZ,
/* ATA bus states */
BUS_UNKNOWN = 0,
BUS_DMA = 1,
@ -844,7 +851,8 @@ extern int sata_link_debounce(struct ata_link *link,
extern int sata_link_resume(struct ata_link *link, const unsigned long *params,
unsigned long deadline);
extern int sata_link_hardreset(struct ata_link *link,
const unsigned long *timing, unsigned long deadline);
const unsigned long *timing, unsigned long deadline,
bool *online, int (*check_ready)(struct ata_link *));
extern void ata_std_postreset(struct ata_link *link, unsigned int *classes);
extern void ata_port_disable(struct ata_port *);