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libata-pmp.c

/*
 * 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 and SRST
                   * times out under certain configurations.
                   * Config device can be at port 0 or 5 and
                   * locks up on SRST.
                   */
                  if (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)
 *
 *    Drive EH recovery operation for PMP enabled port @ap.  This
 *    function recovers host and PMP ports with proper retrials and
 *    fallbacks.  Actual recovery operations are performed using
 *    ata_eh_recover() and sata_pmp_eh_recover_pmp().
 *
 *    LOCKING:
 *    Kernel thread context (may sleep).
 *
 *    RETURNS:
 *    0 on success, -errno on failure.
 */
static int sata_pmp_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 pmp_prereset, ata_reset_fn_t pmp_softreset,
            ata_reset_fn_t pmp_hardreset, ata_postreset_fn_t pmp_postreset)
{
      int pmp_tries, link_tries[SATA_PMP_MAX_PORTS];
      struct ata_link *pmp_link = &ap->link;
      struct ata_device *pmp_dev = pmp_link->device;
      struct ata_eh_context *pmp_ehc = &pmp_link->eh_context;
      struct ata_link *link;
      struct ata_device *dev;
      unsigned int err_mask;
      u32 gscr_error, sntf;
      int cnt, rc;

      pmp_tries = ATA_EH_PMP_TRIES;
      ata_port_for_each_link(link, ap)
            link_tries[link->pmp] = ATA_EH_PMP_LINK_TRIES;

 retry:
      /* PMP attached? */
      if (!ap->nr_pmp_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 (pmp_dev->class != ATA_DEV_PMP)
                  return 0;

            /* new PMP online */
            ata_port_for_each_link(link, ap)
                  link_tries[link->pmp] = ATA_EH_PMP_LINK_TRIES;

            /* fall through */
      }

      /* recover pmp */
      rc = sata_pmp_eh_recover_pmp(ap, prereset, softreset, hardreset,
                             postreset);
      if (rc)
            goto pmp_fail;

      /* handle disabled links */
      rc = sata_pmp_eh_handle_disabled_links(ap);
      if (rc)
            goto pmp_fail;

      /* recover links */
      rc = ata_eh_recover(ap, pmp_prereset, pmp_softreset, pmp_hardreset,
                      pmp_postreset, &link);
      if (rc)
            goto link_fail;

      /* Connection status might have changed while resetting other
       * links, check SATA_PMP_GSCR_ERROR before returning.
       */

      /* clear SNotification */
      rc = sata_scr_read(&ap->link, SCR_NOTIFICATION, &sntf);
      if (rc == 0)
            sata_scr_write(&ap->link, SCR_NOTIFICATION, sntf);

      /* enable notification */
      if (pmp_dev->flags & ATA_DFLAG_AN) {
            pmp_dev->gscr[SATA_PMP_GSCR_FEAT_EN] |= SATA_PMP_FEAT_NOTIFY;

            err_mask = sata_pmp_write(pmp_dev->link, SATA_PMP_GSCR_FEAT_EN,
                                pmp_dev->gscr[SATA_PMP_GSCR_FEAT_EN]);
            if (err_mask) {
                  ata_dev_printk(pmp_dev, KERN_ERR, "failed to write "
                               "PMP_FEAT_EN (Emask=0x%x)\n", err_mask);
                  rc = -EIO;
                  goto pmp_fail;
            }
      }

      /* check GSCR_ERROR */
      err_mask = sata_pmp_read(pmp_link, SATA_PMP_GSCR_ERROR, &gscr_error);
      if (err_mask) {
            ata_dev_printk(pmp_dev, KERN_ERR, "failed to read "
                         "PMP_GSCR_ERROR (Emask=0x%x)\n", err_mask);
            rc = -EIO;
            goto pmp_fail;
      }

      cnt = 0;
      ata_port_for_each_link(link, ap) {
            if (!(gscr_error & (1 << link->pmp)))
                  continue;

            if (sata_pmp_handle_link_fail(link, link_tries)) {
                  ata_ehi_hotplugged(&link->eh_context.i);
                  cnt++;
            } else {
                  ata_link_printk(link, KERN_WARNING,
                        "PHY status changed but maxed out on retries, "
                        "giving up\n");
                  ata_link_printk(link, KERN_WARNING,
                        "Manully issue scan to resume this link\n");
            }
      }

      if (cnt) {
            ata_port_printk(ap, KERN_INFO, "PMP SError.N set for some "
                        "ports, repeating recovery\n");
            goto retry;
      }

      return 0;

 link_fail:
      if (sata_pmp_handle_link_fail(link, link_tries)) {
            pmp_ehc->i.action |= ATA_EH_HARDRESET;
            goto retry;
      }

      /* fall through */
 pmp_fail:
      /* Control always ends up here after detaching PMP.  Shut up
       * and return if we're unloading.
       */
      if (ap->pflags & ATA_PFLAG_UNLOADING)
            return rc;

      if (!ap->nr_pmp_links)
            goto retry;

      if (--pmp_tries) {
            ata_port_printk(ap, KERN_WARNING,
                        "failed to recover PMP, retrying in 5 secs\n");
            pmp_ehc->i.action |= ATA_EH_HARDRESET;
            ssleep(5);
            goto retry;
      }

      ata_port_printk(ap, KERN_ERR,
                  "failed to recover PMP after %d tries, giving up\n",
                  ATA_EH_PMP_TRIES);
      sata_pmp_detach(pmp_dev);
      ata_dev_disable(pmp_dev);

      return rc;
}

/**
 *    sata_pmp_do_eh - do standard error handling for PMP-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)
 *    @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)
 *
 *    Perform standard error handling sequence for PMP-enabled host
 *    @ap.
 *
 *    LOCKING:
 *    Kernel thread context (may sleep).
 */
void sata_pmp_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 pmp_prereset, ata_reset_fn_t pmp_softreset,
            ata_reset_fn_t pmp_hardreset, ata_postreset_fn_t pmp_postreset)
{
      ata_eh_autopsy(ap);
      ata_eh_report(ap);
      sata_pmp_eh_recover(ap, prereset, softreset, hardreset, postreset,
                      pmp_prereset, pmp_softreset, pmp_hardreset,
                      pmp_postreset);
      ata_eh_finish(ap);
}

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