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libata-pmp.c
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/*
* libata-pmp.c - libata port multiplier support
*
* Copyright (c) 2007 SUSE Linux Products GmbH
* Copyright (c) 2007 Tejun Heo <teheo@suse.de>
*
* This file is released under the GPLv2.
*/
#include <linux/kernel.h>
#include <linux/libata.h>
#include "libata.h"
/**
* sata_pmp_read - read PMP register
* @link: link to read PMP register for
* @reg: register to read
* @r_val: resulting value
*
* Read PMP register.
*
* LOCKING:
* Kernel thread context (may sleep).
*
* RETURNS:
* 0 on success, AC_ERR_* mask on failure.
*/
static unsigned int sata_pmp_read(struct ata_link *link, int reg, u32 *r_val)
{
struct ata_port *ap = link->ap;
struct ata_device *pmp_dev = ap->link.device;
struct ata_taskfile tf;
unsigned int err_mask;
ata_tf_init(pmp_dev, &tf);
tf.command = ATA_CMD_PMP_READ;
tf.protocol = ATA_PROT_NODATA;
tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
tf.feature = reg;
tf.device = link->pmp;
err_mask = ata_exec_internal(pmp_dev, &tf, NULL, DMA_NONE, NULL, 0,
SATA_PMP_SCR_TIMEOUT);
if (err_mask)
return err_mask;
*r_val = tf.nsect | tf.lbal << 8 | tf.lbam << 16 | tf.lbah << 24;
return 0;
}
/**
* sata_pmp_write - write PMP register
* @link: link to write PMP register for
* @reg: register to write
* @r_val: value to write
*
* Write PMP register.
*
* LOCKING:
* Kernel thread context (may sleep).
*
* RETURNS:
* 0 on success, AC_ERR_* mask on failure.
*/
static unsigned int sata_pmp_write(struct ata_link *link, int reg, u32 val)
{
struct ata_port *ap = link->ap;
struct ata_device *pmp_dev = ap->link.device;
struct ata_taskfile tf;
ata_tf_init(pmp_dev, &tf);
tf.command = ATA_CMD_PMP_WRITE;
tf.protocol = ATA_PROT_NODATA;
tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
tf.feature = reg;
tf.device = link->pmp;
tf.nsect = val & 0xff;
tf.lbal = (val >> 8) & 0xff;
tf.lbam = (val >> 16) & 0xff;
tf.lbah = (val >> 24) & 0xff;
return ata_exec_internal(pmp_dev, &tf, NULL, DMA_NONE, NULL, 0,
SATA_PMP_SCR_TIMEOUT);
}
/**
* sata_pmp_qc_defer_cmd_switch - qc_defer for command switching PMP
* @qc: ATA command in question
*
* A host which has command switching PMP support cannot issue
* commands to multiple links simultaneously.
*
* LOCKING:
* spin_lock_irqsave(host lock)
*
* RETURNS:
* ATA_DEFER_* if deferring is needed, 0 otherwise.
*/
int sata_pmp_qc_defer_cmd_switch(struct ata_queued_cmd *qc)
{
struct ata_link *link = qc->dev->link;
struct ata_port *ap = link->ap;
if (ap->excl_link == NULL || ap->excl_link == link) {
if (ap->nr_active_links == 0 || ata_link_active(link)) {
qc->flags |= ATA_QCFLAG_CLEAR_EXCL;
return ata_std_qc_defer(qc);
}
ap->excl_link = link;
}
return ATA_DEFER_PORT;
}
/**
* sata_pmp_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 sata_pmp_scr_read(struct ata_link *link, int reg, u32 *r_val)
{
unsigned int err_mask;
if (reg > SATA_PMP_PSCR_CONTROL)
return -EINVAL;
err_mask = sata_pmp_read(link, reg, r_val);
if (err_mask) {
ata_link_printk(link, KERN_WARNING, "failed to read SCR %d "
"(Emask=0x%x)\n", reg, err_mask);
return -EIO;
}
return 0;
}
/**
* sata_pmp_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 sata_pmp_scr_write(struct ata_link *link, int reg, u32 val)
{
unsigned int err_mask;
if (reg > SATA_PMP_PSCR_CONTROL)
return -EINVAL;
err_mask = sata_pmp_write(link, reg, val);
if (err_mask) {
ata_link_printk(link, KERN_WARNING, "failed to write SCR %d "
"(Emask=0x%x)\n", reg, err_mask);
return -EIO;
}
return 0;
}
/**
* sata_pmp_std_prereset - prepare PMP link for reset
* @link: link to be reset
* @deadline: deadline jiffies for the operation
*
* @link is about to be reset. Initialize it.
*
* LOCKING:
* Kernel thread context (may sleep)
*
* RETURNS:
* 0 on success, -errno otherwise.
*/
int sata_pmp_std_prereset(struct ata_link *link, unsigned long deadline)
{
struct ata_eh_context *ehc = &link->eh_context;
const unsigned long *timing = sata_ehc_deb_timing(ehc);
int rc;
/* force HRST? */
if (link->flags & ATA_LFLAG_NO_SRST)
ehc->i.action |= ATA_EH_HARDRESET;
/* handle link resume */
if ((ehc->i.flags & ATA_EHI_RESUME_LINK) &&
(link->flags & ATA_LFLAG_HRST_TO_RESUME))
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;
/* resume link */
rc = sata_link_resume(link, timing, deadline);
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 = sata_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;
}
/**
* sata_pmp_std_hardreset - standard hardreset method for PMP link
* @link: link to be reset
* @class: resulting class of attached device
* @deadline: deadline jiffies for the operation
*
* Hardreset PMP 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 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);
u32 tmp;
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);
goto out;
}
/* clear SError bits including .X which blocks the port when set */
rc = sata_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;
}
/* if device is present, follow up with srst to wait for !BSY */
if (ata_link_online(link))
rc = -EAGAIN;
out:
/* if SCR isn't accessible, we need to reset the PMP */
if (rc && rc != -EAGAIN && sata_scr_read(link, SCR_STATUS, &tmp))
rc = -ERESTART;
DPRINTK("EXIT, rc=%d\n", rc);
return rc;
}
/**
* ata_std_postreset - standard postreset method for PMP 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 sata_pmp_std_postreset(struct ata_link *link, unsigned int *class)
{
u32 serror;
DPRINTK("ENTER\n");
/* clear SError */
if (sata_scr_read(link, SCR_ERROR, &serror) == 0)
sata_scr_write(link, SCR_ERROR, serror);
/* print link status */
sata_print_link_status(link);
DPRINTK("EXIT\n");
}
/**
* sata_pmp_read_gscr - read GSCR block of SATA PMP
* @dev: PMP device
* @gscr: buffer to read GSCR block into
*
* Read selected PMP GSCRs from the PMP at @dev. This will serve
* as configuration and identification info for the PMP.
*
* LOCKING:
* Kernel thread context (may sleep).
*
* RETURNS:
* 0 on success, -errno on failure.
*/
static int sata_pmp_read_gscr(struct ata_device *dev, u32 *gscr)
{
static const int gscr_to_read[] = { 0, 1, 2, 32, 33, 64, 96 };
int i;
for (i = 0; i < ARRAY_SIZE(gscr_to_read); i++) {
int reg = gscr_to_read[i];
unsigned int err_mask;
err_mask = sata_pmp_read(dev->link, reg, &gscr[reg]);
if (err_mask) {
ata_dev_printk(dev, KERN_ERR, "failed to read PMP "
"GSCR[%d] (Emask=0x%x)\n", reg, err_mask);
return -EIO;
}
}
return 0;
}
static const char *sata_pmp_spec_rev_str(const u32 *gscr)
{
u32 rev = gscr[SATA_PMP_GSCR_REV];
if (rev & (1 << 2))
return "1.1";
if (rev & (1 << 1))
return "1.0";
return "<unknown>";
}
static int sata_pmp_configure(struct ata_device *dev, int print_info)
{
struct ata_port *ap = dev->link->ap;
u32 *gscr = dev->gscr;
unsigned int err_mask = 0;
const char *reason;
int nr_ports, rc;
nr_ports = sata_pmp_gscr_ports(gscr);
if (nr_ports <= 0 || nr_ports > SATA_PMP_MAX_PORTS) {
rc = -EINVAL;
reason = "invalid nr_ports";
goto fail;
}
if ((ap->flags & ATA_FLAG_AN) &&
(gscr[SATA_PMP_GSCR_FEAT] & SATA_PMP_FEAT_NOTIFY))
dev->flags |= ATA_DFLAG_AN;
/* monitor SERR_PHYRDY_CHG on fan-out ports */
err_mask = sata_pmp_write(dev->link, SATA_PMP_GSCR_ERROR_EN,
SERR_PHYRDY_CHG);
if (err_mask) {
rc = -EIO;
reason = "failed to write GSCR_ERROR_EN";
goto fail;
}
/* turn off notification till fan-out ports are reset and configured */
if (gscr[SATA_PMP_GSCR_FEAT_EN] & SATA_PMP_FEAT_NOTIFY) {
gscr[SATA_PMP_GSCR_FEAT_EN] &= ~SATA_PMP_FEAT_NOTIFY;
err_mask = sata_pmp_write(dev->link, SATA_PMP_GSCR_FEAT_EN,
gscr[SATA_PMP_GSCR_FEAT_EN]);
if (err_mask) {
rc = -EIO;
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",
sata_pmp_spec_rev_str(gscr),
sata_pmp_gscr_vendor(gscr),
sata_pmp_gscr_devid(gscr),
sata_pmp_gscr_rev(gscr),
nr_ports, gscr[SATA_PMP_GSCR_FEAT_EN],
gscr[SATA_PMP_GSCR_FEAT]);
if (!(dev->flags & ATA_DFLAG_AN))
ata_dev_printk(dev, KERN_INFO,
"Asynchronous notification not supported, "
"hotplug won't\n work on fan-out "
"ports. Use warm-plug instead.\n");
}
return 0;
fail:
ata_dev_printk(dev, KERN_ERR,
"failed to configure Port Multiplier (%s, Emask=0x%x)\n",
reason, err_mask);
return rc;
}
static int sata_pmp_init_links(struct ata_port *ap, int nr_ports)
{
struct ata_link *pmp_link = ap->pmp_link;
int i;
if (!pmp_link) {
pmp_link = kzalloc(sizeof(pmp_link[0]) * SATA_PMP_MAX_PORTS,
GFP_NOIO);
if (!pmp_link)
return -ENOMEM;
for (i = 0; i < SATA_PMP_MAX_PORTS; i++)
ata_link_init(ap, &pmp_link[i], i);
ap->pmp_link = pmp_link;
}
for (i = 0; i < nr_ports; i++) {
struct ata_link *link = &pmp_link[i];
struct ata_eh_context *ehc = &link->eh_context;
link->flags = 0;
ehc->i.probe_mask |= 1;
ehc->i.action |= ATA_EH_SOFTRESET;
ehc->i.flags |= ATA_EHI_RESUME_LINK;
}
return 0;
}
static void sata_pmp_quirks(struct ata_port *ap)
{
u32 *gscr = ap->link.device->gscr;
u16 vendor = sata_pmp_gscr_vendor(gscr);
u16 devid = sata_pmp_gscr_devid(gscr);
struct ata_link *link;
if (vendor == 0x1095 && devid == 0x3726) {
/* sil3726 quirks */
ata_port_for_each_link(link, ap) {
/* SError.N need a kick in the ass to get working */
link->flags |= ATA_LFLAG_HRST_TO_RESUME;
/* class code report is unreliable */
if (link->pmp < 5)
link->flags |= ATA_LFLAG_ASSUME_ATA;
/* port 5 is for SEMB device and it doesn't like SRST */
if (link->pmp == 5)
link->flags |= ATA_LFLAG_NO_SRST |
ATA_LFLAG_ASSUME_SEMB;
}
} else if (vendor == 0x1095 && devid == 0x4723) {
/* sil4723 quirks */
ata_port_for_each_link(link, ap) {
/* SError.N need a kick in the ass to get working */
link->flags |= ATA_LFLAG_HRST_TO_RESUME;
/* class code report is unreliable */
if (link->pmp < 2)
link->flags |= ATA_LFLAG_ASSUME_ATA;
/* the config device at port 2 locks up on SRST */
if (link->pmp == 2)
link->flags |= ATA_LFLAG_NO_SRST |
ATA_LFLAG_ASSUME_ATA;
}
} else if (vendor == 0x1095 && devid == 0x4726) {
/* sil4726 quirks */
ata_port_for_each_link(link, ap) {
/* SError.N need a kick in the ass to get working */
link->flags |= ATA_LFLAG_HRST_TO_RESUME;
/* class code report is unreliable */
if (link->pmp < 5)
link->flags |= ATA_LFLAG_ASSUME_ATA;
/* The config device, which can be either at
* port 0 or 5, locks up on SRST.
*/
if (link->pmp == 0 || link->pmp == 5)
link->flags |= ATA_LFLAG_NO_SRST |
ATA_LFLAG_ASSUME_ATA;
/* Port 6 is for SEMB device which doesn't
* like SRST either.
*/
if (link->pmp == 6)
link->flags |= ATA_LFLAG_NO_SRST |
ATA_LFLAG_ASSUME_SEMB;
}
} else if (vendor == 0x1095 && (devid == 0x5723 || devid == 0x5733 ||
devid == 0x5734 || devid == 0x5744)) {
/* sil5723/5744 quirks */
/* sil5723/5744 has either two or three downstream
* ports depending on operation mode. The last port
* is empty if any actual IO device is available or
* occupied by a pseudo configuration device
* otherwise. Don't try hard to recover it.
*/
ap->pmp_link[ap->nr_pmp_links - 1].flags |= ATA_LFLAG_NO_RETRY;
} else if (vendor == 0x11ab && devid == 0x4140) {
/* Marvell 88SM4140 quirks. Fan-out ports require PHY
* reset to work; other than that, it behaves very
* nicely.
*/
ata_port_for_each_link(link, ap)
link->flags |= ATA_LFLAG_HRST_TO_RESUME;
}
}
/**
* sata_pmp_attach - attach a SATA PMP device
* @dev: SATA PMP device to attach
*
* Configure and attach SATA PMP device @dev. This function is
* also responsible for allocating and initializing PMP links.
*
* LOCKING:
* Kernel thread context (may sleep).
*
* RETURNS:
* 0 on success, -errno on failure.
*/
int sata_pmp_attach(struct ata_device *dev)
{
struct ata_link *link = dev->link;
struct ata_port *ap = link->ap;
unsigned long flags;
struct ata_link *tlink;
int rc;
/* is it hanging off the right place? */
if (!(ap->flags & ATA_FLAG_PMP)) {
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 = SATA_PMP_CTRL_PORT;
/* read GSCR block */
rc = sata_pmp_read_gscr(dev, dev->gscr);
if (rc)
goto fail;
/* config PMP */
rc = sata_pmp_configure(dev, 1);
if (rc)
goto fail;
rc = sata_pmp_init_links(ap, sata_pmp_gscr_ports(dev->gscr));
if (rc) {
ata_dev_printk(dev, KERN_INFO,
"failed to initialize PMP links\n");
goto fail;
}
/* attach it */
spin_lock_irqsave(ap->lock, flags);
WARN_ON(ap->nr_pmp_links);
ap->nr_pmp_links = sata_pmp_gscr_ports(dev->gscr);
spin_unlock_irqrestore(ap->lock, flags);
sata_pmp_quirks(ap);
if (ap->ops->pmp_attach)
ap->ops->pmp_attach(ap);
ata_port_for_each_link(tlink, ap)
sata_link_init_spd(tlink);
ata_acpi_associate_sata_port(ap);
return 0;
fail:
link->pmp = 0;
return rc;
}
/**
* sata_pmp_detach - detach a SATA PMP device
* @dev: SATA PMP device to detach
*
* Detach SATA PMP device @dev. This function is also
* responsible for deconfiguring PMP links.
*
* LOCKING:
* Kernel thread context (may sleep).
*/
static void sata_pmp_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 != SATA_PMP_CTRL_PORT);
if (ap->ops->pmp_detach)
ap->ops->pmp_detach(ap);
ata_port_for_each_link(tlink, ap)
ata_eh_detach_dev(tlink->device);
spin_lock_irqsave(ap->lock, flags);
ap->nr_pmp_links = 0;
link->pmp = 0;
spin_unlock_irqrestore(ap->lock, flags);
ata_acpi_associate_sata_port(ap);
}
/**
* sata_pmp_same_pmp - does new GSCR matches the configured PMP?
* @dev: PMP device to compare against
* @new_gscr: GSCR block of the new device
*
* Compare @new_gscr against @dev and determine whether @dev is
* the PMP described by @new_gscr.
*
* LOCKING:
* None.
*
* RETURNS:
* 1 if @dev matches @new_gscr, 0 otherwise.
*/
static int sata_pmp_same_pmp(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 = sata_pmp_gscr_vendor(old_gscr);
new_vendor = sata_pmp_gscr_vendor(new_gscr);
old_devid = sata_pmp_gscr_devid(old_gscr);
new_devid = sata_pmp_gscr_devid(new_gscr);
old_nr_ports = sata_pmp_gscr_ports(old_gscr);
new_nr_ports = sata_pmp_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;
}
/**
* sata_pmp_revalidate - revalidate SATA PMP
* @dev: PMP 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 sata_pmp_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;
int rc;
DPRINTK("ENTER\n");
ata_eh_about_to_do(link, NULL, ATA_EH_REVALIDATE);
if (!ata_dev_enabled(dev)) {
rc = -ENODEV;
goto fail;
}
/* wrong class? */
if (ata_class_enabled(new_class) && new_class != ATA_DEV_PMP) {
rc = -ENODEV;
goto fail;
}
/* read GSCR */
rc = sata_pmp_read_gscr(dev, gscr);
if (rc)
goto fail;
/* is the pmp still there? */
if (!sata_pmp_same_pmp(dev, gscr)) {
rc = -ENODEV;
goto fail;
}
memcpy(dev->gscr, gscr, sizeof(gscr[0]) * SATA_PMP_GSCR_DWORDS);
rc = sata_pmp_configure(dev, 0);
if (rc)
goto fail;
ata_eh_done(link, NULL, ATA_EH_REVALIDATE);
DPRINTK("EXIT, rc=0\n");
return 0;
fail:
ata_dev_printk(dev, KERN_ERR,
"PMP revalidation failed (errno=%d)\n", rc);
DPRINTK("EXIT, rc=%d\n", rc);
return rc;
}
/**
* sata_pmp_revalidate_quick - revalidate SATA PMP quickly
* @dev: PMP device to revalidate
*
* Make sure the attached PMP is accessible.
*
* LOCKING:
* Kernel thread context (may sleep).
*
* RETURNS:
* 0 on success, -errno otherwise.
*/
static int sata_pmp_revalidate_quick(struct ata_device *dev)
{
unsigned int err_mask;
u32 prod_id;
err_mask = sata_pmp_read(dev->link, SATA_PMP_GSCR_PROD_ID, &prod_id);
if (err_mask) {
ata_dev_printk(dev, KERN_ERR, "failed to read PMP product ID "
"(Emask=0x%x)\n", err_mask);
return -EIO;
}
if (prod_id != dev->gscr[SATA_PMP_GSCR_PROD_ID]) {
ata_dev_printk(dev, KERN_ERR, "PMP product ID mismatch\n");
/* something weird is going on, request full PMP recovery */
return -EIO;
}
return 0;
}
/**
* sata_pmp_eh_recover_pmp - recover PMP
* @ap: ATA port PMP is attached to
* @prereset: prereset method (can be NULL)
* @softreset: softreset method
* @hardreset: hardreset method
* @postreset: postreset method (can be NULL)
*
* Recover PMP 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 PMP detachment.
*
* LOCKING:
* Kernel thread context (may sleep).
*
* RETURNS:
* 0 on success, -errno on failure.
*/
static int sata_pmp_eh_recover_pmp(struct ata_port *ap,
ata_prereset_fn_t prereset, ata_reset_fn_t softreset,
ata_reset_fn_t hardreset, ata_postreset_fn_t postreset)
{
struct ata_link *link = &ap->link;
struct ata_eh_context *ehc = &link->eh_context;
struct ata_device *dev = link->device;
int tries = ATA_EH_PMP_TRIES;
int detach = 0, rc = 0;
int reval_failed = 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 PMP, giving up\n");
goto fail;
}
ata_eh_thaw_port(ap);
/* PMP is reset, SErrors cannot be trusted, scan all */
ata_port_for_each_link(tlink, ap)
ata_ehi_schedule_probe(&tlink->eh_context.i);
}
/* If revalidation is requested, revalidate and reconfigure;
* otherwise, do quick revalidation.
*/
if (ehc->i.action & ATA_EH_REVALIDATE)
rc = sata_pmp_revalidate(dev, ehc->classes[0]);
else
rc = sata_pmp_revalidate_quick(dev);
if (rc) {
tries--;
if (rc == -ENODEV) {
ehc->i.probe_mask |= 1;
detach = 1;
/* give it just two more chances */
tries = min(tries, 2);
}
if (tries) {
int sleep = ehc->i.flags & ATA_EHI_DID_RESET;
/* consecutive revalidation failures? speed down */
if (reval_failed)
sata_down_spd_limit(link);
else
reval_failed = 1;
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 PMP "
"after %d tries, giving up\n",
ATA_EH_PMP_TRIES);
goto fail;
}
}
/* okay, PMP resurrected */
ehc->i.flags = 0;
DPRINTK("EXIT, rc=0\n");
return 0;
fail:
sata_pmp_detach(dev);
if (detach)
ata_eh_detach_dev(dev);
else
ata_dev_disable(dev);
DPRINTK("EXIT, rc=%d\n", rc);
return rc;
}
static int sata_pmp_eh_handle_disabled_links(struct ata_port *ap)
{
struct ata_link *link;
unsigned long flags;
int rc;
spin_lock_irqsave(ap->lock, flags);
ata_port_for_each_link(link, ap) {
if (!(link->flags & ATA_LFLAG_DISABLED))
continue;
spin_unlock_irqrestore(ap->lock, flags);
/* Some PMPs require hardreset sequence to get
* SError.N working.
*/
if ((link->flags & ATA_LFLAG_HRST_TO_RESUME) &&
(link->eh_context.i.flags & ATA_EHI_RESUME_LINK))
sata_link_hardreset(link, sata_deb_timing_normal,
jiffies + ATA_TMOUT_INTERNAL_QUICK);
/* unconditionally clear SError.N */
rc = sata_scr_write(link, SCR_ERROR, SERR_PHYRDY_CHG);
if (rc) {
ata_link_printk(link, KERN_ERR, "failed to clear "
"SError.N (errno=%d)\n", rc);
return rc;
}
spin_lock_irqsave(ap->lock, flags);
}
spin_unlock_irqrestore(ap->lock, flags);
return 0;
}
static int sata_pmp_handle_link_fail(struct ata_link *link, int *link_tries)
{
struct ata_port *ap = link->ap;
unsigned long flags;
if (link_tries[link->pmp] && --link_tries[link->pmp])
return 1;
/* disable this link */
if (!(link->flags & ATA_LFLAG_DISABLED)) {
ata_link_printk(link, KERN_WARNING,
"failed to recover link after %d tries, disabling\n",
ATA_EH_PMP_LINK_TRIES);
spin_lock_irqsave(ap->lock, flags);
link->flags |= ATA_LFLAG_DISABLED;
spin_unlock_irqrestore(ap->lock, flags);
}
ata_dev_disable(link->device);
link->eh_context.i.action = 0;
return 0;
}
/**
* sata_pmp_eh_recover - recover PMP-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)
* @pmp_prereset: PMP prereset method (can be NULL)
* @pmp_softreset: PMP softreset method (can be NULL)
* @pmp_hardreset: PMP hardreset method (can be NULL)
* @pmp_postreset: PMP postreset method (can be NULL)
*