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![Hannes Reinecke](/assets/img/avatar_default.png)
Add tracepoints for ATA error handling. Signed-off-by: Hannes Reinecke <hare@suse.de> Signed-off-by: Damien Le Moal <damien.lemoal@opensource.wdc.com>
1105 lines
26 KiB
C
1105 lines
26 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* libata-pmp.c - libata port multiplier support
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*
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* Copyright (c) 2007 SUSE Linux Products GmbH
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* Copyright (c) 2007 Tejun Heo <teheo@suse.de>
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*/
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#include <linux/kernel.h>
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#include <linux/export.h>
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#include <linux/libata.h>
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#include <linux/slab.h>
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#include "libata.h"
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#include "libata-transport.h"
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const struct ata_port_operations sata_pmp_port_ops = {
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.inherits = &sata_port_ops,
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.pmp_prereset = ata_std_prereset,
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.pmp_hardreset = sata_std_hardreset,
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.pmp_postreset = ata_std_postreset,
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.error_handler = sata_pmp_error_handler,
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};
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/**
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* sata_pmp_read - read PMP register
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* @link: link to read PMP register for
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* @reg: register to read
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* @r_val: resulting value
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*
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* Read PMP register.
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*
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* LOCKING:
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* Kernel thread context (may sleep).
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*
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* RETURNS:
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* 0 on success, AC_ERR_* mask on failure.
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*/
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static unsigned int sata_pmp_read(struct ata_link *link, int reg, u32 *r_val)
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{
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struct ata_port *ap = link->ap;
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struct ata_device *pmp_dev = ap->link.device;
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struct ata_taskfile tf;
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unsigned int err_mask;
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ata_tf_init(pmp_dev, &tf);
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tf.command = ATA_CMD_PMP_READ;
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tf.protocol = ATA_PROT_NODATA;
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tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_LBA48;
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tf.feature = reg;
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tf.device = link->pmp;
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err_mask = ata_exec_internal(pmp_dev, &tf, NULL, DMA_NONE, NULL, 0,
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SATA_PMP_RW_TIMEOUT);
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if (err_mask)
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return err_mask;
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*r_val = tf.nsect | tf.lbal << 8 | tf.lbam << 16 | tf.lbah << 24;
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return 0;
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}
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/**
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* sata_pmp_write - write PMP register
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* @link: link to write PMP register for
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* @reg: register to write
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* @val: value to write
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*
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* Write PMP register.
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*
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* LOCKING:
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* Kernel thread context (may sleep).
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*
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* RETURNS:
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* 0 on success, AC_ERR_* mask on failure.
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*/
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static unsigned int sata_pmp_write(struct ata_link *link, int reg, u32 val)
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{
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struct ata_port *ap = link->ap;
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struct ata_device *pmp_dev = ap->link.device;
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struct ata_taskfile tf;
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ata_tf_init(pmp_dev, &tf);
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tf.command = ATA_CMD_PMP_WRITE;
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tf.protocol = ATA_PROT_NODATA;
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tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_LBA48;
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tf.feature = reg;
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tf.device = link->pmp;
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tf.nsect = val & 0xff;
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tf.lbal = (val >> 8) & 0xff;
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tf.lbam = (val >> 16) & 0xff;
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tf.lbah = (val >> 24) & 0xff;
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return ata_exec_internal(pmp_dev, &tf, NULL, DMA_NONE, NULL, 0,
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SATA_PMP_RW_TIMEOUT);
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}
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/**
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* sata_pmp_qc_defer_cmd_switch - qc_defer for command switching PMP
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* @qc: ATA command in question
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*
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* A host which has command switching PMP support cannot issue
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* commands to multiple links simultaneously.
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*
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* LOCKING:
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* spin_lock_irqsave(host lock)
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*
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* RETURNS:
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* ATA_DEFER_* if deferring is needed, 0 otherwise.
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*/
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int sata_pmp_qc_defer_cmd_switch(struct ata_queued_cmd *qc)
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{
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struct ata_link *link = qc->dev->link;
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struct ata_port *ap = link->ap;
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if (ap->excl_link == NULL || ap->excl_link == link) {
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if (ap->nr_active_links == 0 || ata_link_active(link)) {
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qc->flags |= ATA_QCFLAG_CLEAR_EXCL;
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return ata_std_qc_defer(qc);
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}
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ap->excl_link = link;
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}
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return ATA_DEFER_PORT;
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}
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/**
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* sata_pmp_scr_read - read PSCR
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* @link: ATA link to read PSCR for
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* @reg: PSCR to read
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* @r_val: resulting value
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*
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* Read PSCR @reg into @r_val for @link, to be called from
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* ata_scr_read().
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*
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* LOCKING:
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* Kernel thread context (may sleep).
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*
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* RETURNS:
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* 0 on success, -errno on failure.
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*/
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int sata_pmp_scr_read(struct ata_link *link, int reg, u32 *r_val)
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{
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unsigned int err_mask;
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if (reg > SATA_PMP_PSCR_CONTROL)
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return -EINVAL;
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err_mask = sata_pmp_read(link, reg, r_val);
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if (err_mask) {
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ata_link_warn(link, "failed to read SCR %d (Emask=0x%x)\n",
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reg, err_mask);
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return -EIO;
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}
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return 0;
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}
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/**
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* sata_pmp_scr_write - write PSCR
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* @link: ATA link to write PSCR for
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* @reg: PSCR to write
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* @val: value to be written
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*
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* Write @val to PSCR @reg for @link, to be called from
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* ata_scr_write() and ata_scr_write_flush().
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*
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* LOCKING:
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* Kernel thread context (may sleep).
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*
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* RETURNS:
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* 0 on success, -errno on failure.
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*/
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int sata_pmp_scr_write(struct ata_link *link, int reg, u32 val)
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{
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unsigned int err_mask;
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if (reg > SATA_PMP_PSCR_CONTROL)
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return -EINVAL;
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err_mask = sata_pmp_write(link, reg, val);
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if (err_mask) {
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ata_link_warn(link, "failed to write SCR %d (Emask=0x%x)\n",
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reg, err_mask);
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return -EIO;
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}
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return 0;
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}
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/**
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* sata_pmp_set_lpm - configure LPM for a PMP link
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* @link: PMP link to configure LPM for
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* @policy: target LPM policy
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* @hints: LPM hints
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*
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* Configure LPM for @link. This function will contain any PMP
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* specific workarounds if necessary.
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*
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* LOCKING:
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* EH context.
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*
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* RETURNS:
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* 0 on success, -errno on failure.
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*/
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int sata_pmp_set_lpm(struct ata_link *link, enum ata_lpm_policy policy,
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unsigned hints)
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{
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return sata_link_scr_lpm(link, policy, true);
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}
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/**
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* sata_pmp_read_gscr - read GSCR block of SATA PMP
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* @dev: PMP device
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* @gscr: buffer to read GSCR block into
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*
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* Read selected PMP GSCRs from the PMP at @dev. This will serve
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* as configuration and identification info for the PMP.
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*
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* LOCKING:
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* Kernel thread context (may sleep).
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*
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* RETURNS:
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* 0 on success, -errno on failure.
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*/
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static int sata_pmp_read_gscr(struct ata_device *dev, u32 *gscr)
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{
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static const int gscr_to_read[] = { 0, 1, 2, 32, 33, 64, 96 };
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int i;
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for (i = 0; i < ARRAY_SIZE(gscr_to_read); i++) {
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int reg = gscr_to_read[i];
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unsigned int err_mask;
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err_mask = sata_pmp_read(dev->link, reg, &gscr[reg]);
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if (err_mask) {
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ata_dev_err(dev, "failed to read PMP GSCR[%d] (Emask=0x%x)\n",
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reg, err_mask);
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return -EIO;
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}
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}
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return 0;
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}
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static const char *sata_pmp_spec_rev_str(const u32 *gscr)
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{
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u32 rev = gscr[SATA_PMP_GSCR_REV];
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if (rev & (1 << 3))
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return "1.2";
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if (rev & (1 << 2))
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return "1.1";
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if (rev & (1 << 1))
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return "1.0";
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return "<unknown>";
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}
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#define PMP_GSCR_SII_POL 129
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static int sata_pmp_configure(struct ata_device *dev, int print_info)
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{
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struct ata_port *ap = dev->link->ap;
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u32 *gscr = dev->gscr;
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u16 vendor = sata_pmp_gscr_vendor(gscr);
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u16 devid = sata_pmp_gscr_devid(gscr);
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unsigned int err_mask = 0;
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const char *reason;
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int nr_ports, rc;
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nr_ports = sata_pmp_gscr_ports(gscr);
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if (nr_ports <= 0 || nr_ports > SATA_PMP_MAX_PORTS) {
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rc = -EINVAL;
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reason = "invalid nr_ports";
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goto fail;
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}
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if ((ap->flags & ATA_FLAG_AN) &&
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(gscr[SATA_PMP_GSCR_FEAT] & SATA_PMP_FEAT_NOTIFY))
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dev->flags |= ATA_DFLAG_AN;
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/* monitor SERR_PHYRDY_CHG on fan-out ports */
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err_mask = sata_pmp_write(dev->link, SATA_PMP_GSCR_ERROR_EN,
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SERR_PHYRDY_CHG);
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if (err_mask) {
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rc = -EIO;
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reason = "failed to write GSCR_ERROR_EN";
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goto fail;
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}
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/* Disable sending Early R_OK.
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* With "cached read" HDD testing and multiple ports busy on a SATA
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* host controller, 3x26 PMP will very rarely drop a deferred
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* R_OK that was intended for the host. Symptom will be all
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* 5 drives under test will timeout, get reset, and recover.
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*/
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if (vendor == 0x1095 && (devid == 0x3726 || devid == 0x3826)) {
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u32 reg;
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err_mask = sata_pmp_read(&ap->link, PMP_GSCR_SII_POL, ®);
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if (err_mask) {
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rc = -EIO;
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reason = "failed to read Sil3x26 Private Register";
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goto fail;
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}
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reg &= ~0x1;
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err_mask = sata_pmp_write(&ap->link, PMP_GSCR_SII_POL, reg);
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if (err_mask) {
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rc = -EIO;
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reason = "failed to write Sil3x26 Private Register";
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goto fail;
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}
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}
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if (print_info) {
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ata_dev_info(dev, "Port Multiplier %s, "
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"0x%04x:0x%04x r%d, %d ports, feat 0x%x/0x%x\n",
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sata_pmp_spec_rev_str(gscr), vendor, devid,
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sata_pmp_gscr_rev(gscr),
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nr_ports, gscr[SATA_PMP_GSCR_FEAT_EN],
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gscr[SATA_PMP_GSCR_FEAT]);
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if (!(dev->flags & ATA_DFLAG_AN))
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ata_dev_info(dev,
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"Asynchronous notification not supported, "
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"hotplug won't work on fan-out ports. Use warm-plug instead.\n");
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}
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return 0;
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fail:
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ata_dev_err(dev,
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"failed to configure Port Multiplier (%s, Emask=0x%x)\n",
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reason, err_mask);
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return rc;
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}
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static int sata_pmp_init_links (struct ata_port *ap, int nr_ports)
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{
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struct ata_link *pmp_link = ap->pmp_link;
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int i, err;
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if (!pmp_link) {
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pmp_link = kcalloc(SATA_PMP_MAX_PORTS, sizeof(pmp_link[0]),
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GFP_NOIO);
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if (!pmp_link)
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return -ENOMEM;
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for (i = 0; i < SATA_PMP_MAX_PORTS; i++)
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ata_link_init(ap, &pmp_link[i], i);
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ap->pmp_link = pmp_link;
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for (i = 0; i < SATA_PMP_MAX_PORTS; i++) {
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err = ata_tlink_add(&pmp_link[i]);
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if (err) {
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goto err_tlink;
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}
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}
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}
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for (i = 0; i < nr_ports; i++) {
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struct ata_link *link = &pmp_link[i];
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struct ata_eh_context *ehc = &link->eh_context;
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link->flags = 0;
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ehc->i.probe_mask |= ATA_ALL_DEVICES;
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ehc->i.action |= ATA_EH_RESET;
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}
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return 0;
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err_tlink:
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while (--i >= 0)
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ata_tlink_delete(&pmp_link[i]);
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kfree(pmp_link);
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ap->pmp_link = NULL;
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return err;
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}
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static void sata_pmp_quirks(struct ata_port *ap)
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{
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u32 *gscr = ap->link.device->gscr;
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u16 vendor = sata_pmp_gscr_vendor(gscr);
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u16 devid = sata_pmp_gscr_devid(gscr);
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struct ata_link *link;
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if (vendor == 0x1095 && (devid == 0x3726 || devid == 0x3826)) {
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/* sil3x26 quirks */
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ata_for_each_link(link, ap, EDGE) {
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/* link reports offline after LPM */
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link->flags |= ATA_LFLAG_NO_LPM;
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/*
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* Class code report is unreliable and SRST times
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* out under certain configurations.
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*/
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if (link->pmp < 5)
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link->flags |= ATA_LFLAG_NO_SRST |
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ATA_LFLAG_ASSUME_ATA;
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/* port 5 is for SEMB device and it doesn't like SRST */
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if (link->pmp == 5)
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link->flags |= ATA_LFLAG_NO_SRST |
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ATA_LFLAG_ASSUME_SEMB;
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}
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} else if (vendor == 0x1095 && devid == 0x4723) {
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/*
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* sil4723 quirks
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*
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* Link reports offline after LPM. Class code report is
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* unreliable. SIMG PMPs never got SRST reliable and the
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* config device at port 2 locks up on SRST.
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*/
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ata_for_each_link(link, ap, EDGE)
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link->flags |= ATA_LFLAG_NO_LPM |
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ATA_LFLAG_NO_SRST |
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ATA_LFLAG_ASSUME_ATA;
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} else if (vendor == 0x1095 && devid == 0x4726) {
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/* sil4726 quirks */
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ata_for_each_link(link, ap, EDGE) {
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/* link reports offline after LPM */
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link->flags |= ATA_LFLAG_NO_LPM;
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/* Class code report is unreliable and SRST
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* times out under certain configurations.
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* Config device can be at port 0 or 5 and
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* locks up on SRST.
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*/
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if (link->pmp <= 5)
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link->flags |= ATA_LFLAG_NO_SRST |
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ATA_LFLAG_ASSUME_ATA;
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/* Port 6 is for SEMB device which doesn't
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* like SRST either.
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*/
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if (link->pmp == 6)
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link->flags |= ATA_LFLAG_NO_SRST |
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ATA_LFLAG_ASSUME_SEMB;
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}
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} else if (vendor == 0x1095 && (devid == 0x5723 || devid == 0x5733 ||
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devid == 0x5734 || devid == 0x5744)) {
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/* sil5723/5744 quirks */
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/* sil5723/5744 has either two or three downstream
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* ports depending on operation mode. The last port
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* is empty if any actual IO device is available or
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* occupied by a pseudo configuration device
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* otherwise. Don't try hard to recover it.
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*/
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ap->pmp_link[ap->nr_pmp_links - 1].flags |= ATA_LFLAG_NO_RETRY;
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} else if (vendor == 0x197b && (devid == 0x2352 || devid == 0x0325)) {
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/*
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* 0x2352: found in Thermaltake BlackX Duet, jmicron JMB350?
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* 0x0325: jmicron JMB394.
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*/
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ata_for_each_link(link, ap, EDGE) {
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/* SRST breaks detection and disks get misclassified
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* LPM disabled to avoid potential problems
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*/
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link->flags |= ATA_LFLAG_NO_LPM |
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ATA_LFLAG_NO_SRST |
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ATA_LFLAG_ASSUME_ATA;
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}
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} else if (vendor == 0x11ab && devid == 0x4140) {
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/* Marvell 4140 quirks */
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ata_for_each_link(link, ap, EDGE) {
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/* port 4 is for SEMB device and it doesn't like SRST */
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if (link->pmp == 4)
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link->flags |= ATA_LFLAG_DISABLED;
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}
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}
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}
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/**
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* sata_pmp_attach - attach a SATA PMP device
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* @dev: SATA PMP device to attach
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*
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* Configure and attach SATA PMP device @dev. This function is
|
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* also responsible for allocating and initializing PMP links.
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*
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* LOCKING:
|
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* Kernel thread context (may sleep).
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*
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* RETURNS:
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* 0 on success, -errno on failure.
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*/
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int sata_pmp_attach(struct ata_device *dev)
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{
|
|
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 (!sata_pmp_supported(ap)) {
|
|
ata_dev_err(dev, "host does not support Port Multiplier\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (!ata_is_host_link(link)) {
|
|
ata_dev_err(dev, "Port Multipliers cannot be nested\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (dev->devno) {
|
|
ata_dev_err(dev, "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_info(dev, "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_for_each_link(tlink, ap, EDGE)
|
|
sata_link_init_spd(tlink);
|
|
|
|
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_info(dev, "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_for_each_link(tlink, ap, EDGE)
|
|
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);
|
|
}
|
|
|
|
/**
|
|
* 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_info(dev,
|
|
"Port Multiplier vendor mismatch '0x%x' != '0x%x'\n",
|
|
old_vendor, new_vendor);
|
|
return 0;
|
|
}
|
|
|
|
if (old_devid != new_devid) {
|
|
ata_dev_info(dev,
|
|
"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_info(dev,
|
|
"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;
|
|
|
|
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);
|
|
|
|
return 0;
|
|
|
|
fail:
|
|
ata_dev_err(dev, "PMP revalidation failed (errno=%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_err(dev,
|
|
"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_err(dev, "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;
|
|
|
|
if (dev->flags & ATA_DFLAG_DETACH) {
|
|
detach = 1;
|
|
rc = -ENODEV;
|
|
goto fail;
|
|
}
|
|
|
|
retry:
|
|
ehc->classes[0] = ATA_DEV_UNKNOWN;
|
|
|
|
if (ehc->i.action & ATA_EH_RESET) {
|
|
struct ata_link *tlink;
|
|
|
|
/* reset */
|
|
rc = ata_eh_reset(link, 0, prereset, softreset, hardreset,
|
|
postreset);
|
|
if (rc) {
|
|
ata_link_err(link, "failed to reset PMP, giving up\n");
|
|
goto fail;
|
|
}
|
|
|
|
/* PMP is reset, SErrors cannot be trusted, scan all */
|
|
ata_for_each_link(tlink, ap, EDGE) {
|
|
struct ata_eh_context *ehc = &tlink->eh_context;
|
|
|
|
ehc->i.probe_mask |= ATA_ALL_DEVICES;
|
|
ehc->i.action |= ATA_EH_RESET;
|
|
}
|
|
}
|
|
|
|
/* 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 |= ATA_ALL_DEVICES;
|
|
detach = 1;
|
|
/* give it just two more chances */
|
|
tries = min(tries, 2);
|
|
}
|
|
|
|
if (tries) {
|
|
/* consecutive revalidation failures? speed down */
|
|
if (reval_failed)
|
|
sata_down_spd_limit(link, 0);
|
|
else
|
|
reval_failed = 1;
|
|
|
|
ehc->i.action |= ATA_EH_RESET;
|
|
goto retry;
|
|
} else {
|
|
ata_dev_err(dev,
|
|
"failed to recover PMP after %d tries, giving up\n",
|
|
ATA_EH_PMP_TRIES);
|
|
goto fail;
|
|
}
|
|
}
|
|
|
|
/* okay, PMP resurrected */
|
|
ehc->i.flags = 0;
|
|
|
|
return 0;
|
|
|
|
fail:
|
|
sata_pmp_detach(dev);
|
|
if (detach)
|
|
ata_eh_detach_dev(dev);
|
|
else
|
|
ata_dev_disable(dev);
|
|
|
|
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_for_each_link(link, ap, EDGE) {
|
|
if (!(link->flags & ATA_LFLAG_DISABLED))
|
|
continue;
|
|
|
|
spin_unlock_irqrestore(ap->lock, flags);
|
|
|
|
/* Some PMPs require hardreset sequence to get
|
|
* SError.N working.
|
|
*/
|
|
sata_link_hardreset(link, sata_deb_timing_normal,
|
|
ata_deadline(jiffies, ATA_TMOUT_INTERNAL_QUICK),
|
|
NULL, NULL);
|
|
|
|
/* unconditionally clear SError.N */
|
|
rc = sata_scr_write(link, SCR_ERROR, SERR_PHYRDY_CHG);
|
|
if (rc) {
|
|
ata_link_err(link,
|
|
"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_warn(link,
|
|
"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
|
|
*
|
|
* 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)
|
|
{
|
|
struct ata_port_operations *ops = ap->ops;
|
|
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;
|
|
u32 *gscr = pmp_dev->gscr;
|
|
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_for_each_link(link, ap, EDGE)
|
|
link_tries[link->pmp] = ATA_EH_PMP_LINK_TRIES;
|
|
|
|
retry:
|
|
/* PMP attached? */
|
|
if (!sata_pmp_attached(ap)) {
|
|
rc = ata_eh_recover(ap, ops->prereset, ops->softreset,
|
|
ops->hardreset, ops->postreset, NULL);
|
|
if (rc) {
|
|
ata_for_each_dev(dev, &ap->link, ALL)
|
|
ata_dev_disable(dev);
|
|
return rc;
|
|
}
|
|
|
|
if (pmp_dev->class != ATA_DEV_PMP)
|
|
return 0;
|
|
|
|
/* new PMP online */
|
|
ata_for_each_link(link, ap, EDGE)
|
|
link_tries[link->pmp] = ATA_EH_PMP_LINK_TRIES;
|
|
|
|
/* fall through */
|
|
}
|
|
|
|
/* recover pmp */
|
|
rc = sata_pmp_eh_recover_pmp(ap, ops->prereset, ops->softreset,
|
|
ops->hardreset, ops->postreset);
|
|
if (rc)
|
|
goto pmp_fail;
|
|
|
|
/* PHY event notification can disturb reset and other recovery
|
|
* operations. Turn it off.
|
|
*/
|
|
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(pmp_link, SATA_PMP_GSCR_FEAT_EN,
|
|
gscr[SATA_PMP_GSCR_FEAT_EN]);
|
|
if (err_mask) {
|
|
ata_link_warn(pmp_link,
|
|
"failed to disable NOTIFY (err_mask=0x%x)\n",
|
|
err_mask);
|
|
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, ops->pmp_prereset, ops->pmp_softreset,
|
|
ops->pmp_hardreset, ops->pmp_postreset, &link);
|
|
if (rc)
|
|
goto link_fail;
|
|
|
|
/* clear SNotification */
|
|
rc = sata_scr_read(&ap->link, SCR_NOTIFICATION, &sntf);
|
|
if (rc == 0)
|
|
sata_scr_write(&ap->link, SCR_NOTIFICATION, sntf);
|
|
|
|
/*
|
|
* If LPM is active on any fan-out port, hotplug wouldn't
|
|
* work. Return w/ PHY event notification disabled.
|
|
*/
|
|
ata_for_each_link(link, ap, EDGE)
|
|
if (link->lpm_policy > ATA_LPM_MAX_POWER)
|
|
return 0;
|
|
|
|
/*
|
|
* Connection status might have changed while resetting other
|
|
* links, enable notification and check SATA_PMP_GSCR_ERROR
|
|
* before returning.
|
|
*/
|
|
|
|
/* enable notification */
|
|
if (pmp_dev->flags & ATA_DFLAG_AN) {
|
|
gscr[SATA_PMP_GSCR_FEAT_EN] |= SATA_PMP_FEAT_NOTIFY;
|
|
|
|
err_mask = sata_pmp_write(pmp_link, SATA_PMP_GSCR_FEAT_EN,
|
|
gscr[SATA_PMP_GSCR_FEAT_EN]);
|
|
if (err_mask) {
|
|
ata_dev_err(pmp_dev,
|
|
"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_err(pmp_dev,
|
|
"failed to read PMP_GSCR_ERROR (Emask=0x%x)\n",
|
|
err_mask);
|
|
rc = -EIO;
|
|
goto pmp_fail;
|
|
}
|
|
|
|
cnt = 0;
|
|
ata_for_each_link(link, ap, EDGE) {
|
|
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_warn(link,
|
|
"PHY status changed but maxed out on retries, giving up\n");
|
|
ata_link_warn(link,
|
|
"Manually issue scan to resume this link\n");
|
|
}
|
|
}
|
|
|
|
if (cnt) {
|
|
ata_port_info(ap,
|
|
"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_RESET;
|
|
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 (!sata_pmp_attached(ap))
|
|
goto retry;
|
|
|
|
if (--pmp_tries) {
|
|
pmp_ehc->i.action |= ATA_EH_RESET;
|
|
goto retry;
|
|
}
|
|
|
|
ata_port_err(ap, "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_error_handler - do standard error handling for PMP-enabled host
|
|
* @ap: host port to handle error for
|
|
*
|
|
* Perform standard error handling sequence for PMP-enabled host
|
|
* @ap.
|
|
*
|
|
* LOCKING:
|
|
* Kernel thread context (may sleep).
|
|
*/
|
|
void sata_pmp_error_handler(struct ata_port *ap)
|
|
{
|
|
ata_eh_autopsy(ap);
|
|
ata_eh_report(ap);
|
|
sata_pmp_eh_recover(ap);
|
|
ata_eh_finish(ap);
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(sata_pmp_port_ops);
|
|
EXPORT_SYMBOL_GPL(sata_pmp_qc_defer_cmd_switch);
|
|
EXPORT_SYMBOL_GPL(sata_pmp_error_handler);
|