* Re: PM works with SiI3124 + SiI3726
2006-06-18 18:48 PM works with SiI3124 + SiI3726 kadowaki
@ 2006-06-18 19:30 ` kadowaki
0 siblings, 0 replies; 2+ messages in thread
From: kadowaki @ 2006-06-18 19:30 UTC (permalink / raw)
To: linux-ide
[-- Attachment #1: Type: text/plain, Size: 4203 bytes --]
Hi,
I found there are one extra port detected in Sil3726, where Sil4726
reports two extra ports.
Attached is libata-pm.c which works fine in my box.
$ dmesg|grep -A 86 libata
libata version 1.30 loaded.
sata_sil24 0000:03:03.0: version 0.24
ACPI: PCI Interrupt 0000:03:03.0[A] -> GSI 56 (level, low) -> IRQ 177
sata_sil24 0000:03:03.0: Applying completion IRQ loss on PCI-X errata
fix
ata1: SATA max UDMA/100 cmd 0xF8D90000 ctl 0x0 bmdma 0x0 irq 177
ata2: SATA max UDMA/100 cmd 0xF8D92000 ctl 0x0 bmdma 0x0 irq 177
ata3: SATA max UDMA/100 cmd 0xF8D94000 ctl 0x0 bmdma 0x0 irq 177
ata4: SATA max UDMA/100 cmd 0xF8D96000 ctl 0x0 bmdma 0x0 irq 177
scsi0 : sata_sil24
ata1: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
ata1.15: Port Multiplier 1.1, 0x1095:0x3726 r23, 5 ports, feat 0x9/0x9
ata1.00: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
ata1.01: SATA link down (SStatus 0 SControl 300)
ata1.02: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
ata1.03: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
ata1.04: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
ata1.00: cfg 49:2f00 82:346b 83:7f21 84:4003 85:3469 86:3c01 87:4003 88:
007f
ata1.00: ATA-6, max UDMA/133, 72303840 sectors: LBA48
ata1.00: applying bridge limits
ata1.00: configured for UDMA/100
ata1.02: cfg 49:2f00 82:346b 83:7d01 84:5823 85:3469 86:3c01 87:4023 88:
207f
ata1.02: ATA-7, max UDMA/133, 488397168 sectors: LBA48 NCQ (depth 31/32)
ata1.02: configured for UDMA/100
ata1.03: cfg 49:2f00 82:346b 83:7d01 84:5823 85:3469 86:3c01 87:4023 88:
207f
ata1.03: ATA-7, max UDMA/133, 488397168 sectors: LBA48 NCQ (depth 31/32)
ata1.03: configured for UDMA/100
ata1.04: cfg 49:2f00 82:7c6b 83:7f09 84:4063 85:7c69 86:3e01 87:4063 88:
007f
ata1.04: ATA-7, max UDMA/133, 490234752 sectors: LBA48 NCQ (depth 31/32)
ata1.04: configured for UDMA/100
scsi1 : sata_sil24
ata2: SATA link down (SStatus 0 SControl 300)
scsi2 : sata_sil24
ata3: SATA link down (SStatus 0 SControl 300)
scsi3 : sata_sil24
ata4: SATA link down (SStatus 0 SControl 300)
Vendor: ATA Model: WDC WD360GD-00FN Rev: 34.0
Type: Direct-Access ANSI SCSI revision: 05
SCSI device sda: 72303840 512-byte hdwr sectors (37020 MB)
sda: Write Protect is off
sda: Mode Sense: 00 3a 00 00
SCSI device sda: drive cache: write back
SCSI device sda: 72303840 512-byte hdwr sectors (37020 MB)
sda: Write Protect is off
sda: Mode Sense: 00 3a 00 00
SCSI device sda: drive cache: write back
sda: sda1 sda2 sda3 sda4 < sda5 sda6 sda7 >
sd 0:0:0:0: Attached scsi disk sda
Vendor: ATA Model: ST3250824NS Rev: 3.AE
Type: Direct-Access ANSI SCSI revision: 05
sd 0:0:0:0: Attached scsi generic sg0 type 0
SCSI device sdb: 488397168 512-byte hdwr sectors (250059 MB)
sdb: Write Protect is off
sdb: Mode Sense: 00 3a 00 00
SCSI device sdb: drive cache: write back
SCSI device sdb: 488397168 512-byte hdwr sectors (250059 MB)
sdb: Write Protect is off
sdb: Mode Sense: 00 3a 00 00
SCSI device sdb: drive cache: write back
sdb: unknown partition table
sd 0:0:2:0: Attached scsi disk sdb
sd 0:0:2:0: Attached scsi generic sg1 type 0
Vendor: ATA Model: ST3250824NS Rev: 3.AE
Type: Direct-Access ANSI SCSI revision: 05
SCSI device sdc: 488397168 512-byte hdwr sectors (250059 MB)
sdc: Write Protect is off
sdc: Mode Sense: 00 3a 00 00
SCSI device sdc: drive cache: write back
SCSI device sdc: 488397168 512-byte hdwr sectors (250059 MB)
sdc: Write Protect is off
sdc: Mode Sense: 00 3a 00 00
SCSI device sdc: drive cache: write back
sdc: unknown partition table
sd 0:0:3:0: Attached scsi disk sdc
sd 0:0:3:0: Attached scsi generic sg2 type 0
Vendor: ATA Model: Maxtor 7L250S0 Rev: BANC
Type: Direct-Access ANSI SCSI revision: 05
SCSI device sdd: 490234752 512-byte hdwr sectors (251000 MB)
sdd: Write Protect is off
sdd: Mode Sense: 00 3a 00 00
SCSI device sdd: drive cache: write back
SCSI device sdd: 490234752 512-byte hdwr sectors (251000 MB)
sdd: Write Protect is off
sdd: Mode Sense: 00 3a 00 00
SCSI device sdd: drive cache: write back
sdd: sdd1
sd 0:0:4:0: Attached scsi disk sdd
sd 0:0:4:0: Attached scsi generic sg3 type 0
[-- Attachment #2: libata-pm.c --]
[-- Type: application/octet-stream, Size: 24212 bytes --]
/*
* libata-pm.c - libata port multiplier support
*
* Maintained by: Jeff Garzik <jgarzik@pobox.com>
* Please ALWAYS copy linux-ide@vger.kernel.org
* on emails.
*
* Copyright 2006 Tejun Heo <htejun@gmail.com>
*
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139,
* USA.
*
*
* libata documentation is available via 'make {ps|pdf}docs',
* as Documentation/DocBook/libata.*
*
* Hardware documentation available from http://www.t13.org/ and
* http://www.sata-io.org/
*
*/
#include <linux/config.h>
#include <linux/kernel.h>
#include <linux/libata.h>
#include "libata.h"
/**
* ata_pm_read_init_tf - initialize TF for PM read
* @tf: taskfile to initialize
* @dev: PM dev
* @pmp: port multiplier port number
* @reg: register to read
*
* Initialize @tf for PM read command.
*
* LOCKING:
* None.
*/
void ata_pm_read_init_tf(struct ata_taskfile *tf,
struct ata_device *dev, int pmp, int reg)
{
ata_tf_init(dev, tf);
tf->command = ATA_CMD_PM_READ;
tf->protocol = ATA_PROT_NODATA;
tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
tf->feature = reg;
tf->device = pmp;
}
/**
* ata_pm_read_val - extract PM read result from TF
* @tf: target TF
*
* Determine PM read result from @tf.
*
* LOCKING:
* None.
*/
u32 ata_pm_read_val(const struct ata_taskfile *tf)
{
return tf->nsect | tf->lbal << 8 | tf->lbam << 16 | tf->lbah << 24;
}
/**
* ata_pm_read_init_tf - initialize TF for PM write
* @tf: taskfile to initialize
* @dev: PM dev
* @pmp: port multiplier port number
* @reg: register to read
* @val: value to write
*
* Initialize @tf for PM write command.
*
* LOCKING:
* None.
*/
void ata_pm_write_init_tf(struct ata_taskfile *tf,
struct ata_device *dev, int pmp, int reg, u32 val)
{
ata_tf_init(dev, tf);
tf->command = ATA_CMD_PM_WRITE;
tf->protocol = ATA_PROT_NODATA;
tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
tf->feature = reg;
tf->device = pmp;
tf->nsect = val & 0xff;
tf->lbal = (val >> 8) & 0xff;
tf->lbam = (val >> 16) & 0xff;
tf->lbah = (val >> 24) & 0xff;
}
/**
* ata_pm_scr_read - read PSCR
* @link: ATA link to read PSCR for
* @reg: PSCR to read
* @r_val: resulting value
*
* Read PSCR @reg into @r_val for @link, to be called from
* ata_scr_read().
*
* LOCKING:
* Kernel thread context (may sleep).
*
* RETURNS:
* 0 on success, -errno on failure.
*/
int ata_pm_scr_read(struct ata_link *link, int reg, u32 *r_val)
{
struct ata_port *ap = link->ap;
struct ata_device *pm_dev = ap->link.device;
might_sleep();
if (reg > ATA_PM_PSCR_CONTROL)
return -EINVAL;
return ap->ops->pm_read(pm_dev, link->pmp, reg, r_val);
}
/**
* ata_pm_scr_write - write PSCR
* @link: ATA link to write PSCR for
* @reg: PSCR to write
* @val: value to be written
*
* Write @val to PSCR @reg for @link, to be called from
* ata_scr_write() and ata_scr_write_flush().
*
* LOCKING:
* Kernel thread context (may sleep).
*
* RETURNS:
* 0 on success, -errno on failure.
*/
int ata_pm_scr_write(struct ata_link *link, int reg, u32 val)
{
struct ata_port *ap = link->ap;
struct ata_device *pm_dev = ap->link.device;
might_sleep();
if (reg > ATA_PM_PSCR_CONTROL)
return -EINVAL;
return ap->ops->pm_write(pm_dev, link->pmp, reg, val);
}
/**
* ata_pm_std_prereset - prepare PM link for reset
* @link: link to be reset
*
* @link is about to be reset. Initialize it.
*
* LOCKING:
* Kernel thread context (may sleep)
*
* RETURNS:
* 0 on success, -errno otherwise.
*/
int ata_pm_std_prereset(struct ata_link *link)
{
int rc;
/* if we're about to do hardreset, don't bother */
if (link->eh_context.i.action & ATA_EH_HARDRESET)
return 0;
/* resume link */
rc = sata_link_resume(link, 1);
if (rc) {
/* phy resume failed */
ata_link_printk(link, KERN_WARNING, "failed to resume link "
"for reset (errno=%d)\n", rc);
return rc;
}
/* clear SError bits including .X which blocks the port when set */
rc = ata_scr_write(link, SCR_ERROR, 0xffffffff);
if (rc) {
ata_link_printk(link, KERN_ERR,
"failed to clear SError (errno=%d)\n", rc);
return rc;
}
return 0;
}
/**
* ata_pm_std_hardreset - standard hardreset method for PM link
* @link: link to be reset
*
* Hardreset PM port @link. Note that this function doesn't wait
* for BSY clearance. There simply isn't a generic way to wait
* the event. Instead, this function return -EAGAIN thus telling
* libata-EH to followup with softreset.
*
* LOCKING:
* Kernel thread context (may sleep)
*
* RETURNS:
* 0 on success, -errno otherwise.
*/
int ata_pm_std_hardreset(struct ata_link *link, unsigned int *class)
{
int rc;
DPRINTK("ENTER\n");
/* reset */
rc = sata_link_hardreset(link);
if (rc)
goto out;
/* clear SError bits including .X which blocks the port when set */
rc = ata_scr_write(link, SCR_ERROR, 0xffffffff);
if (rc) {
ata_link_printk(link, KERN_ERR, "failed to clear SError "
"during hardreset (errno=%d)\n", rc);
goto out;
}
/* follow up with softreset so that we can wait for !BSY */
rc = -EAGAIN;
out:
DPRINTK("EXIT, rc=%d\n", rc);
return rc;
}
/**
* ata_std_postreset - standard postreset method for PM link
* @link: the target ata_link
* @classes: classes of attached devices
*
* This function is invoked after a successful reset. Note that
* the device might have been reset more than once using
* different reset methods before postreset is invoked.
*
* LOCKING:
* Kernel thread context (may sleep)
*/
void ata_pm_std_postreset(struct ata_link *link, unsigned int *class)
{
u32 serror;
DPRINTK("ENTER\n");
/* clear SError */
if (ata_scr_read(link, SCR_ERROR, &serror) == 0)
ata_scr_write(link, SCR_ERROR, serror);
/* print link status */
sata_print_link_status(link);
DPRINTK("EXIT\n");
}
/**
* ata_pm_read_gscr - read GSCR block of SATA PM
* @dev: PM device
* @gscr: buffer to read GSCR block into
*
* Read selected PM GSCRs from the PM at @dev. This will serve
* as configuration and identification info for the PM.
*
* LOCKING:
* Kernel thread context (may sleep).
*
* RETURNS:
* 0 on success, -errno on failure.
*/
static int ata_pm_read_gscr(struct ata_device *dev, u32 *gscr)
{
static const int gscr_to_read[] = { 0, 1, 2, 32, 33, 64, 96 };
struct ata_port *ap = dev->link->ap;
int i, rc;
for (i = 0; i < ARRAY_SIZE(gscr_to_read); i++) {
int reg = gscr_to_read[i];
rc = ap->ops->pm_read(dev, ATA_PM_CTRL_PORT, reg, &gscr[reg]);
if (rc) {
ata_dev_printk(dev, KERN_ERR, "failed to read "
"PM GSCR[%d] (errno=%d)\n", reg, rc);
return rc;
}
}
return 0;
}
static const char *ata_pm_spec_rev_str(const u32 *gscr)
{
u32 rev = gscr[ATA_PM_GSCR_REV];
if (rev & (1 << 2))
return "1.1";
if (rev & (1 << 1))
return "1.0";
return "<unknown>";
}
static void ata_pm_quirks(u32 *gscr, int *nr_ports, unsigned int *link_flags)
{
u16 vendor = ata_pm_gscr_vendor(gscr);
u16 devid = ata_pm_gscr_devid(gscr);
/* Sil4726 reports two extra ports for configuration and
* enclosure processor, both of which are ignored ATM. Also,
* it requires hardreset to resume PM links.
*/
if (vendor == 0x1095 && devid == 0x4726) {
*nr_ports -= 2;
*link_flags |= ATA_LFLAG_HRST_TO_RESUME;
}
/* Sil3726 reports one extra ports , which is ignored ATM.
* Also, it requires hardreset to resume PM links.
*/
if (vendor == 0x1095 && devid == 0x3726) {
*nr_ports -= 1;
*link_flags |= ATA_LFLAG_HRST_TO_RESUME;
}
}
static int ata_pm_configure(struct ata_device *dev, int *r_nr_ports,
unsigned int *r_link_flags, int print_info)
{
struct ata_link *link = dev->link;
struct ata_port *ap = link->ap;
u32 *gscr = dev->gscr;
unsigned int link_flags;
const char *reason;
int nr_ports, rc;
nr_ports = ata_pm_gscr_ports(gscr);
link_flags = 0;
ata_pm_quirks(gscr, &nr_ports, &link_flags);
if (nr_ports <= 0 || nr_ports > ATA_PM_MAX_PORTS) {
rc = -EINVAL;
reason = "invalid nr_ports";
goto fail;
}
rc = ap->ops->pm_write(dev, link->pmp, ATA_PM_GSCR_ERROR_EN,
SERR_PHYRDY_CHG | SERR_DEV_XCHG);
if (rc) {
reason = "failed to write GSCR_ERROR_EN";
goto fail;
}
if (ap->flags & ATA_FLAG_SDB_NOTIFY &&
gscr[ATA_PM_GSCR_FEAT] & ATA_PM_FEAT_NOTIFY) {
gscr[ATA_PM_GSCR_FEAT_EN] |= ATA_PM_FEAT_NOTIFY;
rc = ap->ops->pm_write(dev, link->pmp, ATA_PM_GSCR_FEAT_EN,
gscr[ATA_PM_GSCR_FEAT_EN]);
if (rc) {
reason = "failed to write GSCR_FEAT_EN";
goto fail;
}
}
if (print_info)
ata_dev_printk(dev, KERN_INFO, "Port Multiplier %s, "
"0x%04x:0x%04x r%d, %d ports, feat 0x%x/0x%x\n",
ata_pm_spec_rev_str(gscr),
ata_pm_gscr_vendor(gscr),
ata_pm_gscr_devid(gscr), ata_pm_gscr_rev(gscr),
nr_ports, gscr[ATA_PM_GSCR_FEAT_EN],
gscr[ATA_PM_GSCR_FEAT]);
*r_nr_ports = nr_ports;
*r_link_flags = link_flags;
return 0;
fail:
ata_dev_printk(dev, KERN_ERR,
"failed to configure Port Multiplier (%s)\n", reason);
return rc;
}
static int ata_pm_init_links(struct ata_port *ap, int nr_ports,
unsigned int link_flags)
{
struct ata_link *pm_link = ap->pm_link;
int i;
if (!pm_link) {
pm_link = kzalloc(sizeof(pm_link[0]) * ATA_PM_MAX_PORTS,
GFP_NOIO);
if (!pm_link)
return -ENOMEM;
for (i = 0; i < ATA_PM_MAX_PORTS; i++)
ata_link_init(ap, &pm_link[i], i);
ap->pm_link = pm_link;
}
for (i = 0; i < nr_ports; i++) {
struct ata_link *link = &pm_link[i];
link->flags |= link_flags;
link->reset_tries = ATA_EH_PM_RESET_TRIES;
ata_link_init_probe(link);
}
return 0;
}
/**
* ata_pm_attach - attach a SATA PM device
* @dev: SATA PM device to attach
*
* Configure and attach SATA PM device @dev. This function is
* also responsible for allocating and initializing PM links.
*
* LOCKING:
* Kernel thread context (may sleep).
*
* RETURNS:
* 0 on success, -errno on failure.
*/
int ata_pm_attach(struct ata_device *dev)
{
struct ata_link *link = dev->link;
struct ata_port *ap = link->ap;
unsigned int link_flags;
unsigned long flags;
struct ata_link *tlink;
int nr_ports, rc;
/* is it haging off the right place? */
if (!(ap->flags & ATA_FLAG_PM)) {
ata_dev_printk(dev, KERN_ERR,
"host does not support Port Multiplier\n");
return -EINVAL;
}
if (!ata_is_host_link(link)) {
ata_dev_printk(dev, KERN_ERR,
"Port Multipliers cannot be nested\n");
return -EINVAL;
}
if (dev->devno) {
ata_dev_printk(dev, KERN_ERR,
"Port Multiplier must be the first device\n");
return -EINVAL;
}
WARN_ON(link->pmp != 0);
link->pmp = ATA_PM_CTRL_PORT;
/* read GSCR block */
rc = ata_pm_read_gscr(dev, dev->gscr);
if (rc)
goto fail;
/* config PM */
rc = ata_pm_configure(dev, &nr_ports, &link_flags, 1);
if (rc)
goto fail;
rc = ata_pm_init_links(ap, nr_ports, link_flags);
if (rc) {
ata_dev_printk(dev, KERN_INFO,
"failed to initialize PM links\n");
goto fail;
}
/* attach it */
spin_lock_irqsave(&ap->host_set->lock, flags);
WARN_ON(ap->nr_pm_links);
ap->nr_pm_links = nr_ports;
spin_unlock_irqrestore(&ap->host_set->lock, flags);
if (ap->ops->pm_attach)
ap->ops->pm_attach(ap);
ata_port_for_each_link(tlink, ap)
ata_link_init_sata_spd_limit(tlink);
return 0;
fail:
link->pmp = 0;
return rc;
}
/**
* ata_pm_detach - detach a SATA PM device
* @dev: SATA PM device to detach
*
* Detach SATA PM device @dev. This function is also responsible
* for deconfiguring PM links.
*
* LOCKING:
* Kernel thread context (may sleep).
*/
void ata_pm_detach(struct ata_device *dev)
{
struct ata_link *link = dev->link;
struct ata_port *ap = link->ap;
struct ata_link *tlink;
unsigned long flags;
ata_dev_printk(dev, KERN_INFO, "Port Multiplier detaching\n");
WARN_ON(!ata_is_host_link(link) || dev->devno ||
link->pmp != ATA_PM_CTRL_PORT);
if (ap->ops->pm_detach)
ap->ops->pm_detach(ap);
ata_port_for_each_link(tlink, ap)
ata_eh_detach_dev(tlink->device);
spin_lock_irqsave(&ap->host_set->lock, flags);
ap->nr_pm_links = 0;
link->pmp = 0;
spin_unlock_irqrestore(&ap->host_set->lock, flags);
}
/**
* ata_pm_same_pm - determine whether new GSCR matches the configured PM
* @dev: PM device to compare against
* @new_gscr: GSCR block of the new device
*
* Compare @new_gscr against @dev and determine whether @dev is
* the PM described by @new_gscr.
*
* LOCKING:
* None.
*
* RETURNS:
* 1 if @dev matches @new_gscr, 0 otherwise.
*/
static int ata_pm_same_pm(struct ata_device *dev, const u32 *new_gscr)
{
const u32 *old_gscr = dev->gscr;
u16 old_vendor, new_vendor, old_devid, new_devid;
int old_nr_ports, new_nr_ports;
old_vendor = ata_pm_gscr_vendor(old_gscr);
new_vendor = ata_pm_gscr_vendor(new_gscr);
old_devid = ata_pm_gscr_devid(old_gscr);
new_devid = ata_pm_gscr_devid(new_gscr);
old_nr_ports = ata_pm_gscr_ports(old_gscr);
new_nr_ports = ata_pm_gscr_ports(new_gscr);
if (old_vendor != new_vendor) {
ata_dev_printk(dev, KERN_INFO, "Port Multiplier "
"vendor mismatch '0x%x' != '0x%x'\n",
old_vendor, new_vendor);
return 0;
}
if (old_devid != new_devid) {
ata_dev_printk(dev, KERN_INFO, "Port Multiplier "
"device ID mismatch '0x%x' != '0x%x'\n",
old_devid, new_devid);
return 0;
}
if (old_nr_ports != new_nr_ports) {
ata_dev_printk(dev, KERN_INFO, "Port Multiplier "
"nr_ports mismatch '0x%x' != '0x%x'\n",
old_nr_ports, new_nr_ports);
return 0;
}
return 1;
}
/**
* ata_pm_revalidate - revalidate SATA PM
* @dev: PM device to revalidate
* @new_class: new class code
*
* Re-read GSCR block and make sure @dev is still attached to the
* port and properly configured.
*
* LOCKING:
* Kernel thread context (may sleep).
*
* RETURNS:
* 0 on success, -errno otherwise.
*/
static int ata_pm_revalidate(struct ata_device *dev, unsigned int new_class)
{
struct ata_link *link = dev->link;
struct ata_port *ap = link->ap;
u32 *gscr = (void *)ap->sector_buf;
unsigned int link_flags;
int nr_ports, rc;
DPRINTK("ENTER\n");
ata_eh_about_to_do(link, ATA_EH_REVALIDATE);
if (!ata_dev_enabled(dev)) {
rc = -ENODEV;
goto fail;
}
/* sometimes wrong class is reported, let it retry */
if (ata_class_enabled(new_class) && new_class != ATA_DEV_PM) {
rc = -EIO;
goto fail;
}
/* read GSCR */
rc = ata_pm_read_gscr(dev, gscr);
if (rc)
goto fail;
/* is the pm still there? */
if (!ata_pm_same_pm(dev, gscr)) {
rc = -ENODEV;
goto fail;
}
memcpy(dev->gscr, gscr, sizeof(gscr[0]) * ATA_PM_GSCR_DWORDS);
rc = ata_pm_configure(dev, &nr_ports, &link_flags, 0);
if (rc)
goto fail;
if (nr_ports != ap->nr_pm_links) {
rc = -ENODEV;
goto fail;
}
link->eh_context.i.action &= ~ATA_EH_REVALIDATE;
DPRINTK("EXIT, rc=0\n");
return 0;
fail:
ata_dev_printk(dev, KERN_ERR,
"PM revalidation failed (errno=%d)\n", rc);
DPRINTK("EXIT, rc=%d\n", rc);
return rc;
}
/**
* ata_pm_revalidate_quick - revalidate SATA PM quickly
* @dev: PM device to revalidate
*
* Make sure the attached PM is accessible.
*
* LOCKING:
* Kernel thread context (may sleep).
*
* RETURNS:
* 0 on success, -errno otherwise.
*/
static int ata_pm_revalidate_quick(struct ata_device *dev)
{
struct ata_port *ap = dev->link->ap;
u32 prod_id;
int rc;
rc = ap->ops->pm_read(dev, ATA_PM_CTRL_PORT, ATA_PM_GSCR_PROD_ID,
&prod_id);
if (rc) {
ata_dev_printk(dev, KERN_ERR, "failed to read PM product ID\n");
return rc;
}
if (prod_id != dev->gscr[ATA_PM_GSCR_PROD_ID]) {
ata_dev_printk(dev, KERN_ERR, "PM product ID mismatch\n");
/* something weird is going on, request full PM recovery */
return -EIO;
}
return 0;
}
/**
* ata_pm_eh_recover_pm - recover PM
* @ap: ATA port PM is attached to
* @prereset: prereset method (can be NULL)
* @softreset: softreset method
* @hardreset: hardreset method
* @postreset: postreset method (can be NULL)
* @link_tries: link tries left
*
* Recover PM attached to @ap. Recovery procedure is somewhat
* similar to that of ata_eh_recover() except that reset should
* always be performed in hard->soft sequence and recovery
* failure results in PM detachment.
*
* LOCKING:
* Kernel thread context (may sleep).
*
* RETURNS:
* 0 on success, -errno on failure.
*/
static int ata_pm_eh_recover_pm(struct ata_port *ap, ata_prereset_fn_t prereset,
ata_reset_fn_t softreset,
ata_reset_fn_t hardreset,
ata_postreset_fn_t postreset, int *link_tries)
{
struct ata_link *link = &ap->link;
struct ata_eh_context *ehc = &link->eh_context;
struct ata_device *dev = link->device;
int tries = link->reset_tries;
int detach = 0, probe = 0, rc = 0;
DPRINTK("ENTER\n");
if (dev->flags & ATA_DFLAG_DETACH) {
detach = 1;
goto fail;
}
retry:
ehc->classes[0] = ATA_DEV_UNKNOWN;
if (ehc->i.action & ATA_EH_RESET_MASK) {
struct ata_link *tlink;
ata_eh_freeze_port(ap);
/* reset */
ehc->i.action = ATA_EH_HARDRESET;
rc = ata_eh_reset(link, 0, prereset, softreset, hardreset,
postreset);
if (rc) {
ata_link_printk(link, KERN_ERR,
"failed to reset PM, giving up\n");
goto fail;
}
ata_eh_thaw_port(ap);
ata_port_for_each_link(tlink, ap) {
struct ata_eh_context *tehc = &tlink->eh_context;
if (link_tries[tlink->pmp])
tehc->i.action = ata_link_resume_action(tlink);
else
tehc->i.action = 0;
}
}
/* If revalidation is requested, revalidate and reconfigure;
* otherwise, do quick revalidation.
*/
if (ehc->i.action & ATA_EH_REVALIDATE)
rc = ata_pm_revalidate(dev, ehc->classes[0]);
else
rc = ata_pm_revalidate_quick(dev);
if (rc == -ENODEV) {
probe = 1;
goto fail;
} else if (rc) {
if (--tries) {
int sleep = ehc->flags & ATA_EHC_DID_RESET;
ata_dev_printk(dev, KERN_WARNING,
"retrying hardreset%s\n",
sleep ? " in 5 secs" : "");
if (sleep)
ssleep(5);
ehc->i.action |= ATA_EH_HARDRESET;
goto retry;
} else {
ata_dev_printk(dev, KERN_ERR, "failed to recover PM "
"after %d resets, giving up\n",
link->reset_tries);
goto fail;
}
}
/* okay, PM resurrected */
ehc->flags &= ~ATA_EHC_DID_RESET;
ehc->i.action = 0;
DPRINTK("EXIT, rc=0\n");
return 0;
fail:
ata_pm_detach(dev);
if (probe || detach) {
ata_eh_detach_dev(dev);
if (probe)
ehc->i.probe_mask |= 1;
} else
ata_dev_disable(dev);
DPRINTK("EXIT, rc=%d\n", rc);
return rc;
}
/**
* ata_pm_eh_recover - recover PM-enabled port
* @ap: ATA port to recover
* @prereset: prereset method (can be NULL)
* @softreset: softreset method
* @hardreset: hardreset method
* @postreset: postreset method (can be NULL)
* @pm_prereset: PM prereset method (can be NULL)
* @pm_softreset: PM softreset method (can be NULL)
* @pm_hardreset: PM hardreset method (can be NULL)
* @pm_postreset: PM postreset method (can be NULL)
*
* Drive EH recovery operation for PM enable port @ap. This
* function recovers host and PM ports with proper retrials and
* fallbacks. Actual recovery operations are performed using
* ata_eh_recover() and ata_pm_eh_recover_pm().
*
* LOCKING:
* Kernel thread context (may sleep).
*
* RETURNS:
* 0 on success, -errno on failure.
*/
static int ata_pm_eh_recover(struct ata_port *ap,
ata_prereset_fn_t prereset, ata_reset_fn_t softreset,
ata_reset_fn_t hardreset, ata_postreset_fn_t postreset,
ata_prereset_fn_t pm_prereset, ata_reset_fn_t pm_softreset,
ata_reset_fn_t pm_hardreset, ata_postreset_fn_t pm_postreset)
{
int pm_tries, link_tries[ATA_PM_MAX_PORTS];
struct ata_link *pm_link = &ap->link;
struct ata_device *pm_dev = pm_link->device;
struct ata_eh_info *pm_ehi = &pm_link->eh_context.i;
struct ata_link *link;
struct ata_device *dev;
u32 gscr_error;
int cnt, rc;
pm_tries = ATA_EH_PM_TRIES;
ata_port_for_each_link(link, ap)
link_tries[link->pmp] = ATA_EH_PM_LINK_TRIES;
retry:
/* PM attached? */
if (!ap->nr_pm_links) {
rc = ata_eh_recover(ap, prereset, softreset, hardreset,
postreset, NULL);
if (rc) {
ata_link_for_each_dev(dev, &ap->link)
ata_dev_disable(dev);
return rc;
}
if (pm_dev->class != ATA_DEV_PM)
return 0;
/* new PM online */
ata_port_for_each_link(link, ap)
link_tries[link->pmp] = ATA_EH_PM_LINK_TRIES;
/* fall through */
}
/* recover pm */
rc = ata_pm_eh_recover_pm(ap, prereset, softreset, hardreset, postreset,
link_tries);
if (rc)
goto pm_retry;
/* recover links */
rc = ata_eh_recover(ap, pm_prereset, pm_softreset, pm_hardreset,
pm_postreset, &link);
if (rc)
goto link_retry;
/* Connection status might have changed while resetting other
* links, check ATA_PM_GSCR_ERROR before returning.
*/
/* clear snotification */
ata_scr_write(pm_link, SCR_NOTIFICATION, (1 << ap->nr_pm_links) - 1);
/* check GSCR_ERROR */
rc = ap->ops->pm_read(pm_dev, pm_link->pmp, ATA_PM_GSCR_ERROR,
&gscr_error);
if (rc) {
ata_dev_printk(pm_dev, KERN_ERR,
"failed to read PM_GSCR_ERROR\n");
goto pm_retry;
}
cnt = 0;
ata_port_for_each_link(link, ap) {
struct ata_eh_info *ehi = &link->eh_context.i;
if (gscr_error & (1 << link->pmp) &&
link_tries[link->pmp] && --link_tries[link->pmp]) {
ehi->probe_mask |= 1;
ehi->action = ata_link_resume_action(link);
cnt++;
}
}
if (cnt) {
ata_port_printk(ap, KERN_INFO, "PM SError.N/X set for some "
"ports, repeating recovery\n");
goto retry;
}
return 0;
link_retry:
if (link_tries[link->pmp] && --link_tries[link->pmp]) {
ata_link_printk(link, KERN_WARNING,
"failed to recover link, resetting PM\n");
pm_ehi->action |= ATA_EH_HARDRESET;
goto retry;
}
/* give up this link */
ata_link_printk(link, KERN_ERR,
"failed to recover link after %d tries, giving up\n",
ATA_EH_PM_LINK_TRIES);
ata_dev_disable(link->device);
link->eh_context.i.action = 0;
/* fall through */
pm_retry:
/* Control always ends up here after detaching PM. Shut up
* and return if we're unloading.
*/
if (ap->flags & ATA_FLAG_UNLOADING)
return rc;
if (!ap->nr_pm_links)
goto retry;
if (--pm_tries) {
ata_port_printk(ap, KERN_WARNING,
"failed to recover PM, retrying in 5 secs\n");
pm_ehi->action |= ATA_EH_HARDRESET;
ssleep(5);
goto retry;
}
ata_port_printk(ap, KERN_ERR,
"failed to recover PM after %d tries, giving up\n",
ATA_EH_PM_TRIES);
ata_pm_detach(pm_dev);
return rc;
}
/**
* ata_pm_do_eh - do standard error handling for PM-enabled host
* @ap: host port to handle error for
* @prereset: prereset method (can be NULL)
* @softreset: softreset method
* @hardreset: hardreset method
* @postreset: postreset method (can be NULL)
* @pm_prereset: PM prereset method (can be NULL)
* @pm_softreset: PM softreset method (can be NULL)
* @pm_hardreset: PM hardreset method (can be NULL)
* @pm_postreset: PM postreset method (can be NULL)
*
* Perform standard error handling sequence for PM-enabled host
* @ap.
*
* LOCKING:
* Kernel thread context (may sleep).
*/
void ata_pm_do_eh(struct ata_port *ap,
ata_prereset_fn_t prereset, ata_reset_fn_t softreset,
ata_reset_fn_t hardreset, ata_postreset_fn_t postreset,
ata_prereset_fn_t pm_prereset, ata_reset_fn_t pm_softreset,
ata_reset_fn_t pm_hardreset, ata_postreset_fn_t pm_postreset)
{
if (!(ap->flags & (ATA_FLAG_LOADING | ATA_FLAG_UNLOADING))) {
ata_eh_autopsy(ap);
ata_eh_report(ap);
}
ata_pm_eh_recover(ap, prereset, softreset, hardreset, postreset,
pm_prereset, pm_softreset, pm_hardreset,
pm_postreset);
ata_eh_finish(ap);
}
^ permalink raw reply [flat|nested] 2+ messages in thread