forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
1113 lines
26 KiB
1113 lines
26 KiB
// SPDX-License-Identifier: GPL-2.0-only |
|
/* |
|
* libata-pmp.c - libata port multiplier support |
|
* |
|
* Copyright (c) 2007 SUSE Linux Products GmbH |
|
* Copyright (c) 2007 Tejun Heo <[email protected]> |
|
*/ |
|
|
|
#include <linux/kernel.h> |
|
#include <linux/export.h> |
|
#include <linux/libata.h> |
|
#include <linux/slab.h> |
|
#include "libata.h" |
|
#include "libata-transport.h" |
|
|
|
const struct ata_port_operations sata_pmp_port_ops = { |
|
.inherits = &sata_port_ops, |
|
.pmp_prereset = ata_std_prereset, |
|
.pmp_hardreset = sata_std_hardreset, |
|
.pmp_postreset = ata_std_postreset, |
|
.error_handler = sata_pmp_error_handler, |
|
}; |
|
|
|
/** |
|
* 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 | ATA_TFLAG_LBA48; |
|
tf.feature = reg; |
|
tf.device = link->pmp; |
|
|
|
err_mask = ata_exec_internal(pmp_dev, &tf, NULL, DMA_NONE, NULL, 0, |
|
SATA_PMP_RW_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 | ATA_TFLAG_LBA48; |
|
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_RW_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_warn(link, "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_warn(link, "failed to write SCR %d (Emask=0x%x)\n", |
|
reg, err_mask); |
|
return -EIO; |
|
} |
|
return 0; |
|
} |
|
|
|
/** |
|
* sata_pmp_set_lpm - configure LPM for a PMP link |
|
* @link: PMP link to configure LPM for |
|
* @policy: target LPM policy |
|
* @hints: LPM hints |
|
* |
|
* Configure LPM for @link. This function will contain any PMP |
|
* specific workarounds if necessary. |
|
* |
|
* LOCKING: |
|
* EH context. |
|
* |
|
* RETURNS: |
|
* 0 on success, -errno on failure. |
|
*/ |
|
int sata_pmp_set_lpm(struct ata_link *link, enum ata_lpm_policy policy, |
|
unsigned hints) |
|
{ |
|
return sata_link_scr_lpm(link, policy, true); |
|
} |
|
|
|
/** |
|
* 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_err(dev, "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 << 3)) |
|
return "1.2"; |
|
if (rev & (1 << 2)) |
|
return "1.1"; |
|
if (rev & (1 << 1)) |
|
return "1.0"; |
|
return "<unknown>"; |
|
} |
|
|
|
#define PMP_GSCR_SII_POL 129 |
|
|
|
static int sata_pmp_configure(struct ata_device *dev, int print_info) |
|
{ |
|
struct ata_port *ap = dev->link->ap; |
|
u32 *gscr = dev->gscr; |
|
u16 vendor = sata_pmp_gscr_vendor(gscr); |
|
u16 devid = sata_pmp_gscr_devid(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; |
|
} |
|
|
|
/* Disable sending Early R_OK. |
|
* With "cached read" HDD testing and multiple ports busy on a SATA |
|
* host controller, 3x26 PMP will very rarely drop a deferred |
|
* R_OK that was intended for the host. Symptom will be all |
|
* 5 drives under test will timeout, get reset, and recover. |
|
*/ |
|
if (vendor == 0x1095 && (devid == 0x3726 || devid == 0x3826)) { |
|
u32 reg; |
|
|
|
err_mask = sata_pmp_read(&ap->link, PMP_GSCR_SII_POL, ®); |
|
if (err_mask) { |
|
rc = -EIO; |
|
reason = "failed to read Sil3x26 Private Register"; |
|
goto fail; |
|
} |
|
reg &= ~0x1; |
|
err_mask = sata_pmp_write(&ap->link, PMP_GSCR_SII_POL, reg); |
|
if (err_mask) { |
|
rc = -EIO; |
|
reason = "failed to write Sil3x26 Private Register"; |
|
goto fail; |
|
} |
|
} |
|
|
|
if (print_info) { |
|
ata_dev_info(dev, "Port Multiplier %s, " |
|
"0x%04x:0x%04x r%d, %d ports, feat 0x%x/0x%x\n", |
|
sata_pmp_spec_rev_str(gscr), vendor, devid, |
|
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_info(dev, |
|
"Asynchronous notification not supported, " |
|
"hotplug won't work on fan-out ports. Use warm-plug instead.\n"); |
|
} |
|
|
|
return 0; |
|
|
|
fail: |
|
ata_dev_err(dev, |
|
"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, err; |
|
|
|
if (!pmp_link) { |
|
pmp_link = kcalloc(SATA_PMP_MAX_PORTS, sizeof(pmp_link[0]), |
|
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 < SATA_PMP_MAX_PORTS; i++) { |
|
err = ata_tlink_add(&pmp_link[i]); |
|
if (err) { |
|
goto err_tlink; |
|
} |
|
} |
|
} |
|
|
|
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 |= ATA_ALL_DEVICES; |
|
ehc->i.action |= ATA_EH_RESET; |
|
} |
|
|
|
return 0; |
|
err_tlink: |
|
while (--i >= 0) |
|
ata_tlink_delete(&pmp_link[i]); |
|
kfree(pmp_link); |
|
ap->pmp_link = NULL; |
|
return err; |
|
} |
|
|
|
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 || devid == 0x3826)) { |
|
/* sil3x26 quirks */ |
|
ata_for_each_link(link, ap, EDGE) { |
|
/* link reports offline after LPM */ |
|
link->flags |= ATA_LFLAG_NO_LPM; |
|
|
|
/* |
|
* Class code report is unreliable and SRST times |
|
* out under certain configurations. |
|
*/ |
|
if (link->pmp < 5) |
|
link->flags |= ATA_LFLAG_NO_SRST | |
|
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 |
|
* |
|
* Link reports offline after LPM. Class code report is |
|
* unreliable. SIMG PMPs never got SRST reliable and the |
|
* config device at port 2 locks up on SRST. |
|
*/ |
|
ata_for_each_link(link, ap, EDGE) |
|
link->flags |= ATA_LFLAG_NO_LPM | |
|
ATA_LFLAG_NO_SRST | |
|
ATA_LFLAG_ASSUME_ATA; |
|
} else if (vendor == 0x1095 && devid == 0x4726) { |
|
/* sil4726 quirks */ |
|
ata_for_each_link(link, ap, EDGE) { |
|
/* link reports offline after LPM */ |
|
link->flags |= ATA_LFLAG_NO_LPM; |
|
|
|
/* 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 == 0x197b && (devid == 0x2352 || devid == 0x0325)) { |
|
/* |
|
* 0x2352: found in Thermaltake BlackX Duet, jmicron JMB350? |
|
* 0x0325: jmicron JMB394. |
|
*/ |
|
ata_for_each_link(link, ap, EDGE) { |
|
/* SRST breaks detection and disks get misclassified |
|
* LPM disabled to avoid potential problems |
|
*/ |
|
link->flags |= ATA_LFLAG_NO_LPM | |
|
ATA_LFLAG_NO_SRST | |
|
ATA_LFLAG_ASSUME_ATA; |
|
} |
|
} else if (vendor == 0x11ab && devid == 0x4140) { |
|
/* Marvell 4140 quirks */ |
|
ata_for_each_link(link, ap, EDGE) { |
|
/* port 4 is for SEMB device and it doesn't like SRST */ |
|
if (link->pmp == 4) |
|
link->flags |= ATA_LFLAG_DISABLED; |
|
} |
|
} |
|
} |
|
|
|
/** |
|
* 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 (!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; |
|
|
|
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_err(dev, "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_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; |
|
|
|
DPRINTK("ENTER\n"); |
|
|
|
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; |
|
|
|
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_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);
|
|
|