// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Support for SATA devices on Serial Attached SCSI (SAS) controllers
*
* Copyright (C) 2006 IBM Corporation
*
* Written by: Darrick J. Wong <[email protected]>, IBM Corporation
*/
#include <linux/scatterlist.h>
#include <linux/slab.h>
#include <linux/async.h>
#include <linux/export.h>
#include <scsi/sas_ata.h>
#include "sas_internal.h"
#include <scsi/scsi_host.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_tcq.h>
#include <scsi/scsi.h>
#include <scsi/scsi_transport.h>
#include <scsi/scsi_transport_sas.h>
#include "scsi_sas_internal.h"
#include "scsi_transport_api.h"
#include <scsi/scsi_eh.h>
static enum ata_completion_errors sas_to_ata_err(struct task_status_struct *ts)
{
/* Cheesy attempt to translate SAS errors into ATA. Hah! */
/* transport error */
if (ts->resp == SAS_TASK_UNDELIVERED)
return AC_ERR_ATA_BUS;
/* ts->resp == SAS_TASK_COMPLETE */
/* task delivered, what happened afterwards? */
switch (ts->stat) {
case SAS_DEV_NO_RESPONSE:
return AC_ERR_TIMEOUT;
case SAS_INTERRUPTED:
case SAS_PHY_DOWN:
case SAS_NAK_R_ERR:
return AC_ERR_ATA_BUS;
case SAS_DATA_UNDERRUN:
/*
* Some programs that use the taskfile interface
* (smartctl in particular) can cause underrun
* problems. Ignore these errors, perhaps at our
* peril.
*/
return 0;
case SAS_DATA_OVERRUN:
case SAS_QUEUE_FULL:
case SAS_DEVICE_UNKNOWN:
case SAS_OPEN_TO:
case SAS_OPEN_REJECT:
pr_warn("%s: Saw error %d. What to do?\n",
__func__, ts->stat);
return AC_ERR_OTHER;
case SAM_STAT_CHECK_CONDITION:
case SAS_ABORTED_TASK:
return AC_ERR_DEV;
case SAS_PROTO_RESPONSE:
/* This means the ending_fis has the error
* value; return 0 here to collect it
*/
return 0;
default:
return 0;
}
}
static void sas_ata_task_done(struct sas_task *task)
{
struct ata_queued_cmd *qc = task->uldd_task;
struct domain_device *dev = task->dev;
struct task_status_struct *stat = &task->task_status;
struct ata_task_resp *resp = (struct ata_task_resp *)stat->buf;
struct sas_ha_struct *sas_ha = dev->port->ha;
enum ata_completion_errors ac;
unsigned long flags;
struct ata_link *link;
struct ata_port *ap;
spin_lock_irqsave(&dev->done_lock, flags);
if (test_bit(SAS_HA_FROZEN, &sas_ha->state))
task = NULL;
else if (qc && qc->scsicmd)
ASSIGN_SAS_TASK(qc->scsicmd, NULL);
spin_unlock_irqrestore(&dev->done_lock, flags);
/* check if libsas-eh got to the task before us */
if (unlikely(!task))
return;
if (!qc)
goto qc_already_gone;
ap = qc->ap;
link = &ap->link;
spin_lock_irqsave(ap->lock, flags);
/* check if we lost the race with libata/sas_ata_post_internal() */
if (unlikely(ata_port_is_frozen(ap))) {
spin_unlock_irqrestore(ap->lock, flags);
if (qc->scsicmd)
goto qc_already_gone;
else {
/* if eh is not involved and the port is frozen then the
* ata internal abort process has taken responsibility
* for this sas_task
*/
return;
}
}
if (stat->stat == SAS_PROTO_RESPONSE ||
stat->stat == SAS_SAM_STAT_GOOD ||
(stat->stat == SAS_SAM_STAT_CHECK_CONDITION &&
dev->sata_dev.class == ATA_DEV_ATAPI)) {
memcpy(dev->sata_dev.fis, resp->ending_fis, ATA_RESP_FIS_SIZE);
if (!link->sactive) {
qc->err_mask |= ac_err_mask(dev->sata_dev.fis[2]);
} else {
link->eh_info.err_mask |= ac_err_mask(dev->sata_dev.fis[2]);
if (unlikely(link->eh_info.err_mask))
qc->flags |= ATA_QCFLAG_EH;
}
} else {
ac = sas_to_ata_err(stat);
if (ac) {
pr_warn("%s: SAS error 0x%x\n", __func__, stat->stat);
/* We saw a SAS error. Send a vague error. */
if (!link->sactive) {
qc->err_mask = ac;
} else {
link->eh_info.err_mask |= AC_ERR_DEV;
qc->flags |= ATA_QCFLAG_EH;
}
dev->sata_dev.fis[2] = ATA_ERR | ATA_DRDY; /* tf status */
dev->sata_dev.fis[3] = ATA_ABORTED; /* tf error */
}
}
qc->lldd_task = NULL;
ata_qc_complete(qc);
spin_unlock_irqrestore(ap->lock, flags);
qc_already_gone:
sas_free_task(task);
}
static unsigned int sas_ata_qc_issue(struct ata_queued_cmd *qc)
__must_hold(ap->lock)
{
struct sas_task *task;
struct scatterlist *sg;
int ret = AC_ERR_SYSTEM;
unsigned int si, xfer = 0;
struct ata_port *ap = qc->ap;
struct domain_device *dev = ap->private_data;
struct sas_ha_struct *sas_ha = dev->port->ha;
struct Scsi_Host *host = sas_ha->shost;
struct sas_internal *i = to_sas_internal(host->transportt);
/* TODO: we should try to remove that unlock */
spin_unlock(ap->lock);
/* If the device fell off, no sense in issuing commands */
if (test_bit(SAS_DEV_GONE, &dev->state))
goto out;
task = sas_alloc_task(GFP_ATOMIC);
if (!task)
goto out;
task->dev = dev;
task->task_proto = SAS_PROTOCOL_STP;
task->task_done = sas_ata_task_done;
/* For NCQ commands, zero out the tag libata assigned us */
if (ata_is_ncq(qc->tf.protocol))
qc->tf.nsect = 0;
ata_tf_to_fis(&qc->tf, qc->dev->link->pmp, 1, (u8 *)&task->ata_task.fis);
task->uldd_task = qc;
if (ata_is_atapi(qc->tf.protocol)) {
memcpy(task->ata_task.atapi_packet, qc->cdb, qc->dev->cdb_len);
task->total_xfer_len = qc->nbytes;
task->num_scatter = qc->n_elem;
task->data_dir = qc->dma_dir;
} else if (!ata_is_data(qc->tf.protocol)) {
task->data_dir = DMA_NONE;
} else {
for_each_sg(qc->sg, sg, qc->n_elem, si)
xfer += sg_dma_len(sg);
task->total_xfer_len = xfer;
task->num_scatter = si;
task->data_dir = qc->dma_dir;
}
task->scatter = qc->sg;
qc->lldd_task = task;
task->ata_task.use_ncq = ata_is_ncq(qc->tf.protocol);
task->ata_task.dma_xfer = ata_is_dma(qc->tf.protocol);
if (qc->flags & ATA_QCFLAG_RESULT_TF)
task->ata_task.return_fis_on_success = 1;
if (qc->scsicmd)
ASSIGN_SAS_TASK(qc->scsicmd, task);
ret = i->dft->lldd_execute_task(task, GFP_ATOMIC);
if (ret) {
pr_debug("lldd_execute_task returned: %d\n", ret);
if (qc->scsicmd)
ASSIGN_SAS_TASK(qc->scsicmd, NULL);
sas_free_task(task);
qc->lldd_task = NULL;
ret = AC_ERR_SYSTEM;
}
out:
spin_lock(ap->lock);
return ret;
}
static void sas_ata_qc_fill_rtf(struct ata_queued_cmd *qc)
{
struct domain_device *dev = qc->ap->private_data;
ata_tf_from_fis(dev->sata_dev.fis, &qc->result_tf);
}
static struct sas_internal *dev_to_sas_internal(struct domain_device *dev)
{
return to_sas_internal(dev->port->ha->shost->transportt);
}
static int sas_get_ata_command_set(struct domain_device *dev)
{
struct ata_taskfile tf;
if (dev->dev_type == SAS_SATA_PENDING)
return ATA_DEV_UNKNOWN;
ata_tf_from_fis(dev->frame_rcvd, &tf);
return ata_dev_classify(&tf);
}
int sas_get_ata_info(struct domain_device *dev, struct ex_phy *phy)
{
if (phy->attached_tproto & SAS_PROTOCOL_STP)
dev->tproto = phy->attached_tproto;
if (phy->attached_sata_dev)
dev->tproto |= SAS_SATA_DEV;
if (phy->attached_dev_type == SAS_SATA_PENDING)
dev->dev_type = SAS_SATA_PENDING;
else {
int res;
dev->dev_type = SAS_SATA_DEV;
res = sas_get_report_phy_sata(dev->parent, phy->phy_id,
&dev->sata_dev.rps_resp);
if (res) {
pr_debug("report phy sata to %016llx:%02d returned 0x%x\n",
SAS_ADDR(dev->parent->sas_addr),
phy->phy_id, res);
return res;
}
memcpy(dev->frame_rcvd, &dev->sata_dev.rps_resp.rps.fis,
sizeof(struct dev_to_host_fis));
dev->sata_dev.class = sas_get_ata_command_set(dev);
}
return 0;
}
static int sas_ata_clear_pending(struct domain_device *dev, struct ex_phy *phy)
{
int res;
/* we weren't pending, so successfully end the reset sequence now */
if (dev->dev_type != SAS_SATA_PENDING)
return 1;
/* hmmm, if this succeeds do we need to repost the domain_device to the
* lldd so it can pick up new parameters?
*/
res = sas_get_ata_info(dev, phy);
if (res)
return 0; /* retry */
else
return 1;
}
int smp_ata_check_ready_type(struct ata_link *link)
{
struct domain_device *dev = link->ap->private_data;
struct sas_phy *phy = sas_get_local_phy(dev);
struct domain_device *ex_dev = dev->parent;
enum sas_device_type type = SAS_PHY_UNUSED;
u8 sas_addr[SAS_ADDR_SIZE];
int res;
res = sas_get_phy_attached_dev(ex_dev, phy->number, sas_addr, &type);
sas_put_local_phy(phy);
if (res)
return res;
switch (type) {
case SAS_SATA_PENDING:
return 0;
case SAS_END_DEVICE:
return 1;
default:
return -ENODEV;
}
}
EXPORT_SYMBOL_GPL(smp_ata_check_ready_type);
static int smp_ata_check_ready(struct ata_link *link)
{
int res;
struct ata_port *ap = link->ap;
struct domain_device *dev = ap->private_data;
struct domain_device *ex_dev = dev->parent;
struct sas_phy *phy = sas_get_local_phy(dev);
struct ex_phy *ex_phy = &ex_dev->ex_dev.ex_phy[phy->number];
res = sas_ex_phy_discover(ex_dev, phy->number);
sas_put_local_phy(phy);
/* break the wait early if the expander is unreachable,
* otherwise keep polling
*/
if (res == -ECOMM)
return res;
if (res != SMP_RESP_FUNC_ACC)
return 0;
switch (ex_phy->attached_dev_type) {
case SAS_SATA_PENDING:
return 0;
case SAS_END_DEVICE:
if (ex_phy->attached_sata_dev)
return sas_ata_clear_pending(dev, ex_phy);
fallthrough;
default:
return -ENODEV;
}
}
static int local_ata_check_ready(struct ata_link *link)
{
struct ata_port *ap = link->ap;
struct domain_device *dev = ap->private_data;
struct sas_internal *i = dev_to_sas_internal(dev);
if (i->dft->lldd_ata_check_ready)
return i->dft->lldd_ata_check_ready(dev);
else {
/* lldd's that don't implement 'ready' checking get the
* old default behavior of not coordinating reset
* recovery with libata
*/
return 1;
}
}
static int sas_ata_printk(const char *level, const struct domain_device *ddev,
const char *fmt, ...)
{
struct ata_port *ap = ddev->sata_dev.ap;
struct device *dev = &ddev->rphy->dev;
struct va_format vaf;
va_list args;
int r;
va_start(args, fmt);
vaf.fmt = fmt;
vaf.va = &args;
r = printk("%s" SAS_FMT "ata%u: %s: %pV",
level, ap->print_id, dev_name(dev), &vaf);
va_end(args);
return r;
}
static int sas_ata_wait_after_reset(struct domain_device *dev, unsigned long deadline)
{
struct sata_device *sata_dev = &dev->sata_dev;
int (*check_ready)(struct ata_link *link);
struct ata_port *ap = sata_dev->ap;
struct ata_link *link = &ap->link;
struct sas_phy *phy;
int ret;
phy = sas_get_local_phy(dev);
if (scsi_is_sas_phy_local(phy))
check_ready = local_ata_check_ready;
else
check_ready = smp_ata_check_ready;
sas_put_local_phy(phy);
ret = ata_wait_after_reset(link, deadline, check_ready);
if (ret && ret != -EAGAIN)
sas_ata_printk(KERN_ERR, dev, "reset failed (errno=%d)\n", ret);
return ret;
}
static int sas_ata_hard_reset(struct ata_link *link, unsigned int *class,
unsigned long deadline)
{
struct ata_port *ap = link->ap;
struct domain_device *dev = ap->private_data;
struct sas_internal *i = dev_to_sas_internal(dev);
int ret;
ret = i->dft->lldd_I_T_nexus_reset(dev);
if (ret == -ENODEV)
return ret;
if (ret != TMF_RESP_FUNC_COMPLETE)
sas_ata_printk(KERN_DEBUG, dev, "Unable to reset ata device?\n");
ret = sas_ata_wait_after_reset(dev, deadline);
*class = dev->sata_dev.class;
ap->cbl = ATA_CBL_SATA;
return ret;
}
/*
* notify the lldd to forget the sas_task for this internal ata command
* that bypasses scsi-eh
*/
static void sas_ata_internal_abort(struct sas_task *task)
{
struct sas_internal *si = dev_to_sas_internal(task->dev);
unsigned long flags;
int res;
spin_lock_irqsave(&task->task_state_lock, flags);
if (task->task_state_flags & SAS_TASK_STATE_ABORTED ||
task->task_state_flags & SAS_TASK_STATE_DONE) {
spin_unlock_irqrestore(&task->task_state_lock, flags);
pr_debug("%s: Task %p already finished.\n", __func__, task);
goto out;
}
task->task_state_flags |= SAS_TASK_STATE_ABORTED;
spin_unlock_irqrestore(&task->task_state_lock, flags);
res = si->dft->lldd_abort_task(task);
spin_lock_irqsave(&task->task_state_lock, flags);
if (task->task_state_flags & SAS_TASK_STATE_DONE ||
res == TMF_RESP_FUNC_COMPLETE) {
spin_unlock_irqrestore(&task->task_state_lock, flags);
goto out;
}
/* XXX we are not prepared to deal with ->lldd_abort_task()
* failures. TODO: lldds need to unconditionally forget about
* aborted ata tasks, otherwise we (likely) leak the sas task
* here
*/
pr_warn("%s: Task %p leaked.\n", __func__, task);
if (!(task->task_state_flags & SAS_TASK_STATE_DONE))
task->task_state_flags &= ~SAS_TASK_STATE_ABORTED;
spin_unlock_irqrestore(&task->task_state_lock, flags);
return;
out:
sas_free_task(task);
}
static void sas_ata_post_internal(struct ata_queued_cmd *qc)
{
if (qc->flags & ATA_QCFLAG_EH)
qc->err_mask |= AC_ERR_OTHER;
if (qc->err_mask) {
/*
* Find the sas_task and kill it. By this point, libata
* has decided to kill the qc and has frozen the port.
* In this state sas_ata_task_done() will no longer free
* the sas_task, so we need to notify the lldd (via
* ->lldd_abort_task) that the task is dead and free it
* ourselves.
*/
struct sas_task *task = qc->lldd_task;
qc->lldd_task = NULL;
if (!task)
return;
task->uldd_task = NULL;
sas_ata_internal_abort(task);
}
}
static void sas_ata_set_dmamode(struct ata_port *ap, struct ata_device *ata_dev)
{
struct domain_device *dev = ap->private_data;
struct sas_internal *i = dev_to_sas_internal(dev);
if (i->dft->lldd_ata_set_dmamode)
i->dft->lldd_ata_set_dmamode(dev);
}
static void sas_ata_sched_eh(struct ata_port *ap)
{
struct domain_device *dev = ap->private_data;
struct sas_ha_struct *ha = dev->port->ha;
unsigned long flags;
spin_lock_irqsave(&ha->lock, flags);
if (!test_and_set_bit(SAS_DEV_EH_PENDING, &dev->state))
ha->eh_active++;
ata_std_sched_eh(ap);
spin_unlock_irqrestore(&ha->lock, flags);
}
void sas_ata_end_eh(struct ata_port *ap)
{
struct domain_device *dev = ap->private_data;
struct sas_ha_struct *ha = dev->port->ha;
unsigned long flags;
spin_lock_irqsave(&ha->lock, flags);
if (test_and_clear_bit(SAS_DEV_EH_PENDING, &dev->state))
ha->eh_active--;
spin_unlock_irqrestore(&ha->lock, flags);
}
static int sas_ata_prereset(struct ata_link *link, unsigned long deadline)
{
struct ata_port *ap = link->ap;
struct domain_device *dev = ap->private_data;
struct sas_phy *local_phy = sas_get_local_phy(dev);
int res = 0;
if (!local_phy->enabled || test_bit(SAS_DEV_GONE, &dev->state))
res = -ENOENT;
sas_put_local_phy(local_phy);
return res;
}
static struct ata_port_operations sas_sata_ops = {
.prereset = sas_ata_prereset,
.hardreset = sas_ata_hard_reset,
.error_handler = ata_std_error_handler,
.post_internal_cmd = sas_ata_post_internal,
.qc_defer = ata_std_qc_defer,
.qc_issue = sas_ata_qc_issue,
.qc_fill_rtf = sas_ata_qc_fill_rtf,
.set_dmamode = sas_ata_set_dmamode,
.sched_eh = sas_ata_sched_eh,
.end_eh = sas_ata_end_eh,
};
int sas_ata_init(struct domain_device *found_dev)
{
struct sas_ha_struct *ha = found_dev->port->ha;
struct Scsi_Host *shost = ha->shost;
struct ata_host *ata_host;
struct ata_port *ap;
int rc;
ata_host = kzalloc(sizeof(*ata_host), GFP_KERNEL);
if (!ata_host) {
pr_err("ata host alloc failed.\n");
return -ENOMEM;
}
ata_host_init(ata_host, ha->dev, &sas_sata_ops);
ap = ata_port_alloc(ata_host);
if (!ap) {
pr_err("ata_port_alloc failed.\n");
rc = -ENODEV;
goto free_host;
}
ap->port_no = 0;
ap->pio_mask = ATA_PIO4;
ap->mwdma_mask = ATA_MWDMA2;
ap->udma_mask = ATA_UDMA6;
ap->flags |= ATA_FLAG_SATA | ATA_FLAG_PIO_DMA | ATA_FLAG_NCQ |
ATA_FLAG_SAS_HOST | ATA_FLAG_FPDMA_AUX;
ap->ops = &sas_sata_ops;
ap->private_data = found_dev;
ap->cbl = ATA_CBL_SATA;
ap->scsi_host = shost;
rc = ata_tport_add(ata_host->dev, ap);
if (rc)
goto free_port;
found_dev->sata_dev.ata_host = ata_host;
found_dev->sata_dev.ap = ap;
return 0;
free_port:
ata_port_free(ap);
free_host:
ata_host_put(ata_host);
return rc;
}
void sas_ata_task_abort(struct sas_task *task)
{
struct ata_queued_cmd *qc = task->uldd_task;
struct completion *waiting;
/* Bounce SCSI-initiated commands to the SCSI EH */
if (qc->scsicmd) {
blk_abort_request(scsi_cmd_to_rq(qc->scsicmd));
return;
}
/* Internal command, fake a timeout and complete. */
qc->flags &= ~ATA_QCFLAG_ACTIVE;
qc->flags |= ATA_QCFLAG_EH;
qc->err_mask |= AC_ERR_TIMEOUT;
waiting = qc->private_data;
complete(waiting);
}
void sas_probe_sata(struct asd_sas_port *port)
{
struct domain_device *dev, *n;
mutex_lock(&port->ha->disco_mutex);
list_for_each_entry(dev, &port->disco_list, disco_list_node) {
if (!dev_is_sata(dev))
continue;
ata_port_probe(dev->sata_dev.ap);
}
mutex_unlock(&port->ha->disco_mutex);
list_for_each_entry_safe(dev, n, &port->disco_list, disco_list_node) {
if (!dev_is_sata(dev))
continue;
sas_ata_wait_eh(dev);
/* if libata could not bring the link up, don't surface
* the device
*/
if (!ata_dev_enabled(sas_to_ata_dev(dev)))
sas_fail_probe(dev, __func__, -ENODEV);
}
}
int sas_ata_add_dev(struct domain_device *parent, struct ex_phy *phy,
struct domain_device *child, int phy_id)
{
struct sas_rphy *rphy;
int ret;
if (child->linkrate > parent->min_linkrate) {
struct sas_phy *cphy = child->phy;
enum sas_linkrate min_prate = cphy->minimum_linkrate,
parent_min_lrate = parent->min_linkrate,
min_linkrate = (min_prate > parent_min_lrate) ?
parent_min_lrate : 0;
struct sas_phy_linkrates rates = {
.maximum_linkrate = parent->min_linkrate,
.minimum_linkrate = min_linkrate,
};
pr_notice("ex %016llx phy%02d SATA device linkrate > min pathway connection rate, attempting to lower device linkrate\n",
SAS_ADDR(child->sas_addr), phy_id);
ret = sas_smp_phy_control(parent, phy_id,
PHY_FUNC_LINK_RESET, &rates);
if (ret) {
pr_err("ex %016llx phy%02d SATA device could not set linkrate (%d)\n",
SAS_ADDR(child->sas_addr), phy_id, ret);
return ret;
}
pr_notice("ex %016llx phy%02d SATA device set linkrate successfully\n",
SAS_ADDR(child->sas_addr), phy_id);
child->linkrate = child->min_linkrate;
}
ret = sas_get_ata_info(child, phy);
if (ret)
return ret;
sas_init_dev(child);
ret = sas_ata_init(child);
if (ret)
return ret;
rphy = sas_end_device_alloc(phy->port);
if (!rphy)
return -ENOMEM;
rphy->identify.phy_identifier = phy_id;
child->rphy = rphy;
get_device(&rphy->dev);
list_add_tail(&child->disco_list_node, &parent->port->disco_list);
ret = sas_discover_sata(child);
if (ret) {
pr_notice("sas_discover_sata() for device %16llx at %016llx:%02d returned 0x%x\n",
SAS_ADDR(child->sas_addr),
SAS_ADDR(parent->sas_addr), phy_id, ret);
sas_rphy_free(child->rphy);
list_del(&child->disco_list_node);
return ret;
}
return 0;
}
static void sas_ata_flush_pm_eh(struct asd_sas_port *port, const char *func)
{
struct domain_device *dev, *n;
list_for_each_entry_safe(dev, n, &port->dev_list, dev_list_node) {
if (!dev_is_sata(dev))
continue;
sas_ata_wait_eh(dev);
/* if libata failed to power manage the device, tear it down */
if (ata_dev_disabled(sas_to_ata_dev(dev)))
sas_fail_probe(dev, func, -ENODEV);
}
}
void sas_suspend_sata(struct asd_sas_port *port)
{
struct domain_device *dev;
mutex_lock(&port->ha->disco_mutex);
list_for_each_entry(dev, &port->dev_list, dev_list_node) {
struct sata_device *sata;
if (!dev_is_sata(dev))
continue;
sata = &dev->sata_dev;
if (sata->ap->pm_mesg.event == PM_EVENT_SUSPEND)
continue;
ata_sas_port_suspend(sata->ap);
}
mutex_unlock(&port->ha->disco_mutex);
sas_ata_flush_pm_eh(port, __func__);
}
void sas_resume_sata(struct asd_sas_port *port)
{
struct domain_device *dev;
mutex_lock(&port->ha->disco_mutex);
list_for_each_entry(dev, &port->dev_list, dev_list_node) {
struct sata_device *sata;
if (!dev_is_sata(dev))
continue;
sata = &dev->sata_dev;
if (sata->ap->pm_mesg.event == PM_EVENT_ON)
continue;
ata_sas_port_resume(sata->ap);
}
mutex_unlock(&port->ha->disco_mutex);
sas_ata_flush_pm_eh(port, __func__);
}
/**
* sas_discover_sata - discover an STP/SATA domain device
* @dev: pointer to struct domain_device of interest
*
* Devices directly attached to a HA port, have no parents. All other
* devices do, and should have their "parent" pointer set appropriately
* before calling this function.
*/
int sas_discover_sata(struct domain_device *dev)
{
if (dev->dev_type == SAS_SATA_PM)
return -ENODEV;
dev->sata_dev.class = sas_get_ata_command_set(dev);
sas_fill_in_rphy(dev, dev->rphy);
return sas_notify_lldd_dev_found(dev);
}
static void async_sas_ata_eh(void *data, async_cookie_t cookie)
{
struct domain_device *dev = data;
struct ata_port *ap = dev->sata_dev.ap;
struct sas_ha_struct *ha = dev->port->ha;
sas_ata_printk(KERN_DEBUG, dev, "dev error handler\n");
ata_scsi_port_error_handler(ha->shost, ap);
sas_put_device(dev);
}
void sas_ata_strategy_handler(struct Scsi_Host *shost)
{
struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
ASYNC_DOMAIN_EXCLUSIVE(async);
int i;
/* it's ok to defer revalidation events during ata eh, these
* disks are in one of three states:
* 1/ present for initial domain discovery, and these
* resets will cause bcn flutters
* 2/ hot removed, we'll discover that after eh fails
* 3/ hot added after initial discovery, lost the race, and need
* to catch the next train.
*/
sas_disable_revalidation(sas_ha);
spin_lock_irq(&sas_ha->phy_port_lock);
for (i = 0; i < sas_ha->num_phys; i++) {
struct asd_sas_port *port = sas_ha->sas_port[i];
struct domain_device *dev;
spin_lock(&port->dev_list_lock);
list_for_each_entry(dev, &port->dev_list, dev_list_node) {
if (!dev_is_sata(dev))
continue;
/* hold a reference over eh since we may be
* racing with final remove once all commands
* are completed
*/
kref_get(&dev->kref);
async_schedule_domain(async_sas_ata_eh, dev, &async);
}
spin_unlock(&port->dev_list_lock);
}
spin_unlock_irq(&sas_ha->phy_port_lock);
async_synchronize_full_domain(&async);
sas_enable_revalidation(sas_ha);
}
void sas_ata_eh(struct Scsi_Host *shost, struct list_head *work_q)
{
struct scsi_cmnd *cmd, *n;
struct domain_device *eh_dev;
do {
LIST_HEAD(sata_q);
eh_dev = NULL;
list_for_each_entry_safe(cmd, n, work_q, eh_entry) {
struct domain_device *ddev = cmd_to_domain_dev(cmd);
if (!dev_is_sata(ddev) || TO_SAS_TASK(cmd))
continue;
if (eh_dev && eh_dev != ddev)
continue;
eh_dev = ddev;
list_move(&cmd->eh_entry, &sata_q);
}
if (!list_empty(&sata_q)) {
struct ata_port *ap = eh_dev->sata_dev.ap;
sas_ata_printk(KERN_DEBUG, eh_dev, "cmd error handler\n");
ata_scsi_cmd_error_handler(shost, ap, &sata_q);
/*
* ata's error handler may leave the cmd on the list
* so make sure they don't remain on a stack list
* about to go out of scope.
*
* This looks strange, since the commands are
* now part of no list, but the next error
* action will be ata_port_error_handler()
* which takes no list and sweeps them up
* anyway from the ata tag array.
*/
while (!list_empty(&sata_q))
list_del_init(sata_q.next);
}
} while (eh_dev);
}
void sas_ata_schedule_reset(struct domain_device *dev)
{
struct ata_eh_info *ehi;
struct ata_port *ap;
unsigned long flags;
if (!dev_is_sata(dev))
return;
ap = dev->sata_dev.ap;
ehi = &ap->link.eh_info;
spin_lock_irqsave(ap->lock, flags);
ehi->err_mask |= AC_ERR_TIMEOUT;
ehi->action |= ATA_EH_RESET;
ata_port_schedule_eh(ap);
spin_unlock_irqrestore(ap->lock, flags);
}
EXPORT_SYMBOL_GPL(sas_ata_schedule_reset);
void sas_ata_wait_eh(struct domain_device *dev)
{
struct ata_port *ap;
if (!dev_is_sata(dev))
return;
ap = dev->sata_dev.ap;
ata_port_wait_eh(ap);
}
void sas_ata_device_link_abort(struct domain_device *device, bool force_reset)
{
struct ata_port *ap = device->sata_dev.ap;
struct ata_link *link = &ap->link;
unsigned long flags;
spin_lock_irqsave(ap->lock, flags);
device->sata_dev.fis[2] = ATA_ERR | ATA_DRDY; /* tf status */
device->sata_dev.fis[3] = ATA_ABORTED; /* tf error */
link->eh_info.err_mask |= AC_ERR_DEV;
if (force_reset)
link->eh_info.action |= ATA_EH_RESET;
ata_link_abort(link);
spin_unlock_irqrestore(ap->lock, flags);
}
EXPORT_SYMBOL_GPL(sas_ata_device_link_abort);
int sas_execute_ata_cmd(struct domain_device *device, u8 *fis, int force_phy_id)
{
struct sas_tmf_task tmf_task = {};
return sas_execute_tmf(device, fis, sizeof(struct host_to_dev_fis),
force_phy_id, &tmf_task);
}
EXPORT_SYMBOL_GPL(sas_execute_ata_cmd);
static ssize_t sas_ncq_prio_supported_show(struct device *device,
struct device_attribute *attr,
char *buf)
{
struct scsi_device *sdev = to_scsi_device(device);
struct domain_device *ddev = sdev_to_domain_dev(sdev);
bool supported;
int rc;
rc = ata_ncq_prio_supported(ddev->sata_dev.ap, sdev, &supported);
if (rc)
return rc;
return sysfs_emit(buf, "%d\n", supported);
}
static struct device_attribute dev_attr_sas_ncq_prio_supported =
__ATTR(ncq_prio_supported, S_IRUGO, sas_ncq_prio_supported_show, NULL);
static ssize_t sas_ncq_prio_enable_show(struct device *device,
struct device_attribute *attr,
char *buf)
{
struct scsi_device *sdev = to_scsi_device(device);
struct domain_device *ddev = sdev_to_domain_dev(sdev);
bool enabled;
int rc;
rc = ata_ncq_prio_enabled(ddev->sata_dev.ap, sdev, &enabled);
if (rc)
return rc;
return sysfs_emit(buf, "%d\n", enabled);
}
static ssize_t sas_ncq_prio_enable_store(struct device *device,
struct device_attribute *attr,
const char *buf, size_t len)
{
struct scsi_device *sdev = to_scsi_device(device);
struct domain_device *ddev = sdev_to_domain_dev(sdev);
bool enable;
int rc;
rc = kstrtobool(buf, &enable);
if (rc)
return rc;
rc = ata_ncq_prio_enable(ddev->sata_dev.ap, sdev, enable);
if (rc)
return rc;
return len;
}
static struct device_attribute dev_attr_sas_ncq_prio_enable =
__ATTR(ncq_prio_enable, S_IRUGO | S_IWUSR,
sas_ncq_prio_enable_show, sas_ncq_prio_enable_store);
static struct attribute *sas_ata_sdev_attrs[] = {
&dev_attr_sas_ncq_prio_supported.attr,
&dev_attr_sas_ncq_prio_enable.attr,
NULL
};
static umode_t sas_ata_attr_is_visible(struct kobject *kobj,
struct attribute *attr, int i)
{
struct device *dev = kobj_to_dev(kobj);
struct scsi_device *sdev = to_scsi_device(dev);
struct domain_device *ddev = sdev_to_domain_dev(sdev);
if (!dev_is_sata(ddev))
return 0;
return attr->mode;
}
const struct attribute_group sas_ata_sdev_attr_group = {
.attrs = sas_ata_sdev_attrs,
.is_visible = sas_ata_attr_is_visible,
};
EXPORT_SYMBOL_GPL(sas_ata_sdev_attr_group);
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