[resend PATCH 0/5] libsas, libata: suspend / resume and "reset once"

[resend PATCH 0/5] libsas, libata: suspend / resume and "reset once"

[Dan Williams]

Hi Jeff,

Let me know if any of these need reworking, otherwise I believe James is
waiting on your ack to take them (well all except patch1) through scsi.git.

--
Dan


Original description:
Set4 of 5 patchsets to update scsi, libsas, and libata in
support of the isci driver.

Let libsas hook into the generic suspend resume infrastructure in
libata, and provide a common suspend/resume implementation for lldds to
reuse.

"Reset once" is not part of the suspend/resume work.  But it is relevant
to libsas users who need to wait for domain-wide ata error recovery and
want to limit the effort for known well-behaved devices.

These have been in -next for the past couple kernel cycles.

---

Artur Wojcik (1):
      isci: implement suspend/resume support

Dan Williams (4):
      libata: reset once
      libata: export ata_port suspend/resume infrastructure for sas
      libsas: suspend / resume support
      libsas, ipr: cleanup ata_host flags initialization via ata_host_init


 Documentation/kernel-parameters.txt |    3 +
 drivers/ata/libata-core.c           |   69 +++++++++++++++++++--------
 drivers/ata/libata-eh.c             |    2 +
 drivers/scsi/ipr.c                  |    3 -
 drivers/scsi/isci/host.c            |    2 -
 drivers/scsi/isci/host.h            |    2 -
 drivers/scsi/isci/init.c            |   58 ++++++++++++++++++++++
 drivers/scsi/libsas/sas_ata.c       |   91 +++++++++++++++++++++++++++++++++--
 drivers/scsi/libsas/sas_discover.c  |   69 +++++++++++++++++++++++----
 drivers/scsi/libsas/sas_dump.c      |    1 
 drivers/scsi/libsas/sas_event.c     |    4 +-
 drivers/scsi/libsas/sas_init.c      |   90 ++++++++++++++++++++++++++++++++++-
 drivers/scsi/libsas/sas_internal.h  |    1 
 drivers/scsi/libsas/sas_phy.c       |   21 ++++++++
 drivers/scsi/libsas/sas_port.c      |   52 ++++++++++++++++++++
 include/linux/libata.h              |   15 +++++-
 include/scsi/libsas.h               |   20 ++++++--
 include/scsi/sas_ata.h              |   10 ++++
 18 files changed, 463 insertions(+), 50 deletions(-)

[resend PATCH 1/5] libata: reset once

[Dan Williams]

Hotplug testing with libsas currently encounters a 55 second wait for
link recovery to give up.  In the case where the user trusts the
response time of their devices permit the recovery attempts to be
limited to one.

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
---
 Documentation/kernel-parameters.txt |    3 +++
 drivers/ata/libata-core.c           |    1 +
 drivers/ata/libata-eh.c             |    2 ++
 include/linux/libata.h              |    1 +
 4 files changed, 7 insertions(+)

diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index a92c5eb..a896b25 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -1351,6 +1351,9 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
 			* nohrst, nosrst, norst: suppress hard, soft
                           and both resets.
 
+			* rstonce: only attempt one reset during
+			  hot-unplug link recovery
+
 			* dump_id: dump IDENTIFY data.
 
 			If there are multiple matching configurations changing
diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index 3fe1202..efd2c72 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -6388,6 +6388,7 @@ static int __init ata_parse_force_one(char **cur,
 		{ "nohrst",	.lflags		= ATA_LFLAG_NO_HRST },
 		{ "nosrst",	.lflags		= ATA_LFLAG_NO_SRST },
 		{ "norst",	.lflags		= ATA_LFLAG_NO_HRST | ATA_LFLAG_NO_SRST },
+		{ "rstonce",	.lflags		= ATA_LFLAG_RST_ONCE },
 	};
 	char *start = *cur, *p = *cur;
 	char *id, *val, *endp;
diff --git a/drivers/ata/libata-eh.c b/drivers/ata/libata-eh.c
index 77fc806..a5d2aba 100644
--- a/drivers/ata/libata-eh.c
+++ b/drivers/ata/libata-eh.c
@@ -2623,6 +2623,8 @@ int ata_eh_reset(struct ata_link *link, int classify,
 	 */
 	while (ata_eh_reset_timeouts[max_tries] != ULONG_MAX)
 		max_tries++;
+	if (link->flags & ATA_LFLAG_RST_ONCE)
+		max_tries = 1;
 	if (link->flags & ATA_LFLAG_NO_HRST)
 		hardreset = NULL;
 	if (link->flags & ATA_LFLAG_NO_SRST)
diff --git a/include/linux/libata.h b/include/linux/libata.h
index 53da442..f777d30 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -182,6 +182,7 @@ enum {
 	ATA_LFLAG_DISABLED	= (1 << 6), /* link is disabled */
 	ATA_LFLAG_SW_ACTIVITY	= (1 << 7), /* keep activity stats */
 	ATA_LFLAG_NO_LPM	= (1 << 8), /* disable LPM on this link */
+	ATA_LFLAG_RST_ONCE	= (1 << 9), /* limit recovery to one reset */
 
 	/* struct ata_port flags */
 	ATA_FLAG_SLAVE_POSS	= (1 << 0), /* host supports slave dev */

[resend PATCH 2/5] libata: export ata_port suspend/resume infrastructure for sas

[Dan Williams]

Reuse ata_port_{suspend|resume}_common for sas.  This path is chosen
over adding coordination between ata-tranport and sas-transport because
libsas wants to revalidate the domain at resume-time at the host level.
It can not validate links have resumed properly until libata has had a
chance to perform its revalidation, and any sane placing of an ata_port
in the sas-transport model would delay it's resumption until after the
host.

Export the common portion of port suspend/resume (bypass pm_runtime),
and allow sas to perform these operations asynchronously (similar to the
libsas async-ata probe implmentation).  Async operation is determined by
having an external, rather than stack based, location for storing the
result of the operation.

Reviewed-by: Jacek Danecki <jacek.danecki@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
---
 drivers/ata/libata-core.c |   58 ++++++++++++++++++++++++++++++++++++---------
 include/linux/libata.h    |   11 +++++++++
 2 files changed, 57 insertions(+), 12 deletions(-)

diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index efd2c72..da31691 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -5248,16 +5248,20 @@ bool ata_link_offline(struct ata_link *link)
 #ifdef CONFIG_PM
 static int ata_port_request_pm(struct ata_port *ap, pm_message_t mesg,
 			       unsigned int action, unsigned int ehi_flags,
-			       int wait)
+			       int *async)
 {
 	struct ata_link *link;
 	unsigned long flags;
-	int rc;
+	int rc = 0;
 
 	/* Previous resume operation might still be in
 	 * progress.  Wait for PM_PENDING to clear.
 	 */
 	if (ap->pflags & ATA_PFLAG_PM_PENDING) {
+		if (async) {
+			*async = -EAGAIN;
+			return 0;
+		}
 		ata_port_wait_eh(ap);
 		WARN_ON(ap->pflags & ATA_PFLAG_PM_PENDING);
 	}
@@ -5266,10 +5270,10 @@ static int ata_port_request_pm(struct ata_port *ap, pm_message_t mesg,
 	spin_lock_irqsave(ap->lock, flags);
 
 	ap->pm_mesg = mesg;
-	if (wait) {
-		rc = 0;
+	if (async)
+		ap->pm_result = async;
+	else
 		ap->pm_result = &rc;
-	}
 
 	ap->pflags |= ATA_PFLAG_PM_PENDING;
 	ata_for_each_link(link, ap, HOST_FIRST) {
@@ -5282,7 +5286,7 @@ static int ata_port_request_pm(struct ata_port *ap, pm_message_t mesg,
 	spin_unlock_irqrestore(ap->lock, flags);
 
 	/* wait and check result */
-	if (wait) {
+	if (!async) {
 		ata_port_wait_eh(ap);
 		WARN_ON(ap->pflags & ATA_PFLAG_PM_PENDING);
 	}
@@ -5292,9 +5296,8 @@ static int ata_port_request_pm(struct ata_port *ap, pm_message_t mesg,
 
 #define to_ata_port(d) container_of(d, struct ata_port, tdev)
 
-static int ata_port_suspend_common(struct device *dev, pm_message_t mesg)
+static int __ata_port_suspend_common(struct ata_port *ap, pm_message_t mesg, int *async)
 {
-	struct ata_port *ap = to_ata_port(dev);
 	unsigned int ehi_flags = ATA_EHI_QUIET;
 	int rc;
 
@@ -5309,10 +5312,17 @@ static int ata_port_suspend_common(struct device *dev, pm_message_t mesg)
 	if (mesg.event == PM_EVENT_SUSPEND)
 		ehi_flags |= ATA_EHI_NO_AUTOPSY | ATA_EHI_NO_RECOVERY;
 
-	rc = ata_port_request_pm(ap, mesg, 0, ehi_flags, 1);
+	rc = ata_port_request_pm(ap, mesg, 0, ehi_flags, async);
 	return rc;
 }
 
+static int ata_port_suspend_common(struct device *dev, pm_message_t mesg)
+{
+	struct ata_port *ap = to_ata_port(dev);
+
+	return __ata_port_suspend_common(ap, mesg, NULL);
+}
+
 static int ata_port_suspend(struct device *dev)
 {
 	if (pm_runtime_suspended(dev))
@@ -5337,16 +5347,22 @@ static int ata_port_poweroff(struct device *dev)
 	return ata_port_suspend_common(dev, PMSG_HIBERNATE);
 }
 
-static int ata_port_resume_common(struct device *dev)
+static int __ata_port_resume_common(struct ata_port *ap, int *async)
 {
-	struct ata_port *ap = to_ata_port(dev);
 	int rc;
 
 	rc = ata_port_request_pm(ap, PMSG_ON, ATA_EH_RESET,
-		ATA_EHI_NO_AUTOPSY | ATA_EHI_QUIET, 1);
+		ATA_EHI_NO_AUTOPSY | ATA_EHI_QUIET, async);
 	return rc;
 }
 
+static int ata_port_resume_common(struct device *dev)
+{
+	struct ata_port *ap = to_ata_port(dev);
+
+	return __ata_port_resume_common(ap, NULL);
+}
+
 static int ata_port_resume(struct device *dev)
 {
 	int rc;
@@ -5379,6 +5395,24 @@ static const struct dev_pm_ops ata_port_pm_ops = {
 	.runtime_idle = ata_port_runtime_idle,
 };
 
+/* sas ports don't participate in pm runtime management of ata_ports,
+ * and need to resume ata devices at the domain level, not the per-port
+ * level. sas suspend/resume is async to allow parallel port recovery
+ * since sas has multiple ata_port instances per Scsi_Host.
+ */
+int ata_sas_port_async_suspend(struct ata_port *ap, int *async)
+{
+	return __ata_port_suspend_common(ap, PMSG_SUSPEND, async);
+}
+EXPORT_SYMBOL_GPL(ata_sas_port_async_suspend);
+
+int ata_sas_port_async_resume(struct ata_port *ap, int *async)
+{
+	return __ata_port_resume_common(ap, async);
+}
+EXPORT_SYMBOL_GPL(ata_sas_port_async_resume);
+
+
 /**
  *	ata_host_suspend - suspend host
  *	@host: host to suspend
diff --git a/include/linux/libata.h b/include/linux/libata.h
index f777d30..af467d3 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -1016,6 +1016,17 @@ extern bool ata_link_offline(struct ata_link *link);
 #ifdef CONFIG_PM
 extern int ata_host_suspend(struct ata_host *host, pm_message_t mesg);
 extern void ata_host_resume(struct ata_host *host);
+extern int ata_sas_port_async_suspend(struct ata_port *ap, int *async);
+extern int ata_sas_port_async_resume(struct ata_port *ap, int *async);
+#else
+static inline int ata_sas_port_async_suspend(struct ata_port *ap, int *async)
+{
+	return 0;
+}
+static inline int ata_sas_port_async_resume(struct ata_port *ap, int *async)
+{
+	return 0;
+}
 #endif
 extern int ata_ratelimit(void);
 extern void ata_msleep(struct ata_port *ap, unsigned int msecs);

[resend PATCH 3/5] libsas: suspend / resume support

[Dan Williams]

libsas power management routines to suspend and recover the sas domain
based on a model where the lldd is allowed and expected to be
"forgetful".

sas_suspend_ha - disable event processing allowing the lldd to take down
                 links without concern for causing hotplug events.
                 Regardless of whether the lldd actually posts link down
                 messages libsas notifies the lldd that all
                 domain_devices are gone.

sas_prep_resume_ha - on the way back up before the lldd starts link
                     training clean out any spurious events that were
                     generated on the way down, and re-enable event
                     processing

sas_resume_ha - after the lldd has started and decided that all phys
		have posted link-up events this routine is called to let
		libsas start it's own timeout of any phys that did not
		resume.  After the timeout an lldd can cancel the
                phy teardown by posting a link-up event.

Storage for ex_change_count (u16) and phy_change_count (u8) are changed
to int so they can be set to -1 to indicate 'invalidated'.

Cc: Alan Stern <stern@rowland.harvard.edu>
Reviewed-by: Jacek Danecki <jacek.danecki@intel.com>
Tested-by: Maciej Patelczyk <maciej.patelczyk@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
---
 drivers/scsi/libsas/sas_ata.c      |   86 ++++++++++++++++++++++++++++++++++
 drivers/scsi/libsas/sas_discover.c |   69 ++++++++++++++++++++++++----
 drivers/scsi/libsas/sas_dump.c     |    1 
 drivers/scsi/libsas/sas_event.c    |    4 +-
 drivers/scsi/libsas/sas_init.c     |   90 ++++++++++++++++++++++++++++++++++++
 drivers/scsi/libsas/sas_internal.h |    1 
 drivers/scsi/libsas/sas_phy.c      |   21 ++++++++
 drivers/scsi/libsas/sas_port.c     |   52 ++++++++++++++++++++-
 include/scsi/libsas.h              |   20 ++++++--
 include/scsi/sas_ata.h             |   10 ++++
 10 files changed, 335 insertions(+), 19 deletions(-)

diff --git a/drivers/scsi/libsas/sas_ata.c b/drivers/scsi/libsas/sas_ata.c
index bec3bc8..4208e16 100644
--- a/drivers/scsi/libsas/sas_ata.c
+++ b/drivers/scsi/libsas/sas_ata.c
@@ -700,6 +700,92 @@ void sas_probe_sata(struct asd_sas_port *port)
 		if (ata_dev_disabled(sas_to_ata_dev(dev)))
 			sas_fail_probe(dev, __func__, -ENODEV);
 	}
+
+}
+
+static bool sas_ata_flush_pm_eh(struct asd_sas_port *port, const char *func)
+{
+	struct domain_device *dev, *n;
+	bool retry = false;
+
+	list_for_each_entry_safe(dev, n, &port->dev_list, dev_list_node) {
+		int rc;
+
+		if (!dev_is_sata(dev))
+			continue;
+
+		sas_ata_wait_eh(dev);
+		rc = dev->sata_dev.pm_result;
+		if (rc == -EAGAIN)
+			retry = true;
+		else if (rc) {
+			/* since we don't have a
+			 * ->port_{suspend|resume} routine in our
+			 *  ata_port ops, and no entanglements with
+			 *  acpi, suspend should just be mechanical trip
+			 *  through eh, catch cases where these
+			 *  assumptions are invalidated
+			 */
+			WARN_ONCE(1, "failed %s %s error: %d\n", func,
+				 dev_name(&dev->rphy->dev), rc);
+		}
+
+		/* 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);
+	}
+
+	return retry;
+}
+
+void sas_suspend_sata(struct asd_sas_port *port)
+{
+	struct domain_device *dev;
+
+ retry:
+	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;
+
+		sata->pm_result = -EIO;
+		ata_sas_port_async_suspend(sata->ap, &sata->pm_result);
+	}
+	mutex_unlock(&port->ha->disco_mutex);
+
+	if (sas_ata_flush_pm_eh(port, __func__))
+		goto retry;
+}
+
+void sas_resume_sata(struct asd_sas_port *port)
+{
+	struct domain_device *dev;
+
+ retry:
+	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;
+
+		sata->pm_result = -EIO;
+		ata_sas_port_async_resume(sata->ap, &sata->pm_result);
+	}
+	mutex_unlock(&port->ha->disco_mutex);
+
+	if (sas_ata_flush_pm_eh(port, __func__))
+		goto retry;
 }
 
 /**
diff --git a/drivers/scsi/libsas/sas_discover.c b/drivers/scsi/libsas/sas_discover.c
index 3e9dc1a..a0c3003 100644
--- a/drivers/scsi/libsas/sas_discover.c
+++ b/drivers/scsi/libsas/sas_discover.c
@@ -24,6 +24,7 @@
 
 #include <linux/scatterlist.h>
 #include <linux/slab.h>
+#include <linux/async.h>
 #include <scsi/scsi_host.h>
 #include <scsi/scsi_eh.h>
 #include "sas_internal.h"
@@ -180,16 +181,18 @@ int sas_notify_lldd_dev_found(struct domain_device *dev)
 	struct Scsi_Host *shost = sas_ha->core.shost;
 	struct sas_internal *i = to_sas_internal(shost->transportt);
 
-	if (i->dft->lldd_dev_found) {
-		res = i->dft->lldd_dev_found(dev);
-		if (res) {
-			printk("sas: driver on pcidev %s cannot handle "
-			       "device %llx, error:%d\n",
-			       dev_name(sas_ha->dev),
-			       SAS_ADDR(dev->sas_addr), res);
-		}
-		kref_get(&dev->kref);
+	if (!i->dft->lldd_dev_found)
+		return 0;
+
+	res = i->dft->lldd_dev_found(dev);
+	if (res) {
+		printk("sas: driver on pcidev %s cannot handle "
+		       "device %llx, error:%d\n",
+		       dev_name(sas_ha->dev),
+		       SAS_ADDR(dev->sas_addr), res);
 	}
+	set_bit(SAS_DEV_FOUND, &dev->state);
+	kref_get(&dev->kref);
 	return res;
 }
 
@@ -200,7 +203,10 @@ void sas_notify_lldd_dev_gone(struct domain_device *dev)
 	struct Scsi_Host *shost = sas_ha->core.shost;
 	struct sas_internal *i = to_sas_internal(shost->transportt);
 
-	if (i->dft->lldd_dev_gone) {
+	if (!i->dft->lldd_dev_gone)
+		return;
+
+	if (test_and_clear_bit(SAS_DEV_FOUND, &dev->state)) {
 		i->dft->lldd_dev_gone(dev);
 		sas_put_device(dev);
 	}
@@ -234,6 +240,47 @@ static void sas_probe_devices(struct work_struct *work)
 	}
 }
 
+static void sas_suspend_devices(struct work_struct *work)
+{
+	struct asd_sas_phy *phy;
+	struct domain_device *dev;
+	struct sas_discovery_event *ev = to_sas_discovery_event(work);
+	struct asd_sas_port *port = ev->port;
+	struct Scsi_Host *shost = port->ha->core.shost;
+	struct sas_internal *si = to_sas_internal(shost->transportt);
+
+	clear_bit(DISCE_SUSPEND, &port->disc.pending);
+
+	sas_suspend_sata(port);
+
+	/* lldd is free to forget the domain_device across the
+	 * suspension, we force the issue here to keep the reference
+	 * counts aligned
+	 */
+	list_for_each_entry(dev, &port->dev_list, dev_list_node)
+		sas_notify_lldd_dev_gone(dev);
+
+	/* we are suspending, so we know events are disabled and
+	 * phy_list is not being mutated
+	 */
+	list_for_each_entry(phy, &port->phy_list, port_phy_el) {
+		if (si->dft->lldd_port_formed)
+			si->dft->lldd_port_deformed(phy);
+		phy->suspended = 1;
+		port->suspended = 1;
+	}
+}
+
+static void sas_resume_devices(struct work_struct *work)
+{
+	struct sas_discovery_event *ev = to_sas_discovery_event(work);
+	struct asd_sas_port *port = ev->port;
+
+	clear_bit(DISCE_RESUME, &port->disc.pending);
+
+	sas_resume_sata(port);
+}
+
 /**
  * sas_discover_end_dev -- discover an end device (SSP, etc)
  * @end: pointer to domain device of interest
@@ -530,6 +577,8 @@ void sas_init_disc(struct sas_discovery *disc, struct asd_sas_port *port)
 		[DISCE_DISCOVER_DOMAIN] = sas_discover_domain,
 		[DISCE_REVALIDATE_DOMAIN] = sas_revalidate_domain,
 		[DISCE_PROBE] = sas_probe_devices,
+		[DISCE_SUSPEND] = sas_suspend_devices,
+		[DISCE_RESUME] = sas_resume_devices,
 		[DISCE_DESTRUCT] = sas_destruct_devices,
 	};
 
diff --git a/drivers/scsi/libsas/sas_dump.c b/drivers/scsi/libsas/sas_dump.c
index fc46093..cd6f99c 100644
--- a/drivers/scsi/libsas/sas_dump.c
+++ b/drivers/scsi/libsas/sas_dump.c
@@ -41,6 +41,7 @@ static const char *sas_phye_str[] = {
 	[1] = "PHYE_OOB_DONE",
 	[2] = "PHYE_OOB_ERROR",
 	[3] = "PHYE_SPINUP_HOLD",
+	[4] = "PHYE_RESUME_TIMEOUT",
 };
 
 void sas_dprint_porte(int phyid, enum port_event pe)
diff --git a/drivers/scsi/libsas/sas_event.c b/drivers/scsi/libsas/sas_event.c
index 789c4d8..aadbd53 100644
--- a/drivers/scsi/libsas/sas_event.c
+++ b/drivers/scsi/libsas/sas_event.c
@@ -134,7 +134,7 @@ static void notify_port_event(struct asd_sas_phy *phy, enum port_event event)
 			&phy->port_events[event].work, ha);
 }
 
-static void notify_phy_event(struct asd_sas_phy *phy, enum phy_event event)
+void sas_notify_phy_event(struct asd_sas_phy *phy, enum phy_event event)
 {
 	struct sas_ha_struct *ha = phy->ha;
 
@@ -159,7 +159,7 @@ int sas_init_events(struct sas_ha_struct *sas_ha)
 
 	sas_ha->notify_ha_event = notify_ha_event;
 	sas_ha->notify_port_event = notify_port_event;
-	sas_ha->notify_phy_event = notify_phy_event;
+	sas_ha->notify_phy_event = sas_notify_phy_event;
 
 	return 0;
 }
diff --git a/drivers/scsi/libsas/sas_init.c b/drivers/scsi/libsas/sas_init.c
index 014297c..dbc8a79 100644
--- a/drivers/scsi/libsas/sas_init.c
+++ b/drivers/scsi/libsas/sas_init.c
@@ -178,7 +178,7 @@ Undo_phys:
 	return error;
 }
 
-int sas_unregister_ha(struct sas_ha_struct *sas_ha)
+static void sas_disable_events(struct sas_ha_struct *sas_ha)
 {
 	/* Set the state to unregistered to avoid further unchained
 	 * events to be queued, and flush any in-progress drainers
@@ -189,7 +189,11 @@ int sas_unregister_ha(struct sas_ha_struct *sas_ha)
 	spin_unlock_irq(&sas_ha->lock);
 	__sas_drain_work(sas_ha);
 	mutex_unlock(&sas_ha->drain_mutex);
+}
 
+int sas_unregister_ha(struct sas_ha_struct *sas_ha)
+{
+	sas_disable_events(sas_ha);
 	sas_unregister_ports(sas_ha);
 
 	/* flush unregistration work */
@@ -381,6 +385,90 @@ int sas_set_phy_speed(struct sas_phy *phy,
 	return ret;
 }
 
+void sas_prep_resume_ha(struct sas_ha_struct *ha)
+{
+	int i;
+
+	set_bit(SAS_HA_REGISTERED, &ha->state);
+
+	/* clear out any stale link events/data from the suspension path */
+	for (i = 0; i < ha->num_phys; i++) {
+		struct asd_sas_phy *phy = ha->sas_phy[i];
+
+		memset(phy->attached_sas_addr, 0, SAS_ADDR_SIZE);
+		phy->port_events_pending = 0;
+		phy->phy_events_pending = 0;
+		phy->frame_rcvd_size = 0;
+	}
+}
+EXPORT_SYMBOL(sas_prep_resume_ha);
+
+static int phys_suspended(struct sas_ha_struct *ha)
+{
+	int i, rc = 0;
+
+	for (i = 0; i < ha->num_phys; i++) {
+		struct asd_sas_phy *phy = ha->sas_phy[i];
+
+		if (phy->suspended)
+			rc++;
+	}
+
+	return rc;
+}
+
+void sas_resume_ha(struct sas_ha_struct *ha)
+{
+	const unsigned long tmo = msecs_to_jiffies(25000);
+	int i;
+
+	/* deform ports on phys that did not resume
+	 * at this point we may be racing the phy coming back (as posted
+	 * by the lldd).  So we post the event and once we are in the
+	 * libsas context check that the phy remains suspended before
+	 * tearing it down.
+	 */
+	i = phys_suspended(ha);
+	if (i)
+		dev_info(ha->dev, "waiting up to 25 seconds for %d phy%s to resume\n",
+			 i, i > 1 ? "s" : "");
+	wait_event_timeout(ha->eh_wait_q, phys_suspended(ha) == 0, tmo);
+	for (i = 0; i < ha->num_phys; i++) {
+		struct asd_sas_phy *phy = ha->sas_phy[i];
+
+		if (phy->suspended) {
+			dev_warn(&phy->phy->dev, "resume timeout\n");
+			sas_notify_phy_event(phy, PHYE_RESUME_TIMEOUT);
+		}
+	}
+
+	/* all phys are back up or timed out, turn on i/o so we can
+	 * flush out disks that did not return
+	 */
+	scsi_unblock_requests(ha->core.shost);
+	sas_drain_work(ha);
+}
+EXPORT_SYMBOL(sas_resume_ha);
+
+void sas_suspend_ha(struct sas_ha_struct *ha)
+{
+	int i;
+
+	sas_disable_events(ha);
+	scsi_block_requests(ha->core.shost);
+	for (i = 0; i < ha->num_phys; i++) {
+		struct asd_sas_port *port = ha->sas_port[i];
+
+		sas_discover_event(port, DISCE_SUSPEND);
+	}
+
+	/* flush suspend events while unregistered */
+	mutex_lock(&ha->drain_mutex);
+	__sas_drain_work(ha);
+	mutex_unlock(&ha->drain_mutex);
+}
+EXPORT_SYMBOL(sas_suspend_ha);
+
 static void sas_phy_release(struct sas_phy *phy)
 {
 	kfree(phy->hostdata);
diff --git a/drivers/scsi/libsas/sas_internal.h b/drivers/scsi/libsas/sas_internal.h
index 507e4cf..1de6796 100644
--- a/drivers/scsi/libsas/sas_internal.h
+++ b/drivers/scsi/libsas/sas_internal.h
@@ -89,6 +89,7 @@ int sas_smp_phy_control(struct domain_device *dev, int phy_id,
 			enum phy_func phy_func, struct sas_phy_linkrates *);
 int sas_smp_get_phy_events(struct sas_phy *phy);
 
+void sas_notify_phy_event(struct asd_sas_phy *phy, enum phy_event event);
 void sas_device_set_phy(struct domain_device *dev, struct sas_port *port);
 struct domain_device *sas_find_dev_by_rphy(struct sas_rphy *rphy);
 struct domain_device *sas_ex_to_ata(struct domain_device *ex_dev, int phy_id);
diff --git a/drivers/scsi/libsas/sas_phy.c b/drivers/scsi/libsas/sas_phy.c
index 521422e..cdee446 100644
--- a/drivers/scsi/libsas/sas_phy.c
+++ b/drivers/scsi/libsas/sas_phy.c
@@ -94,6 +94,25 @@ static void sas_phye_spinup_hold(struct work_struct *work)
 	i->dft->lldd_control_phy(phy, PHY_FUNC_RELEASE_SPINUP_HOLD, NULL);
 }
 
+static void sas_phye_resume_timeout(struct work_struct *work)
+{
+	struct asd_sas_event *ev = to_asd_sas_event(work);
+	struct asd_sas_phy *phy = ev->phy;
+
+	clear_bit(PHYE_RESUME_TIMEOUT, &phy->phy_events_pending);
+
+	/* phew, lldd got the phy back in the nick of time */
+	if (!phy->suspended) {
+		dev_info(&phy->phy->dev, "resume timeout cancelled\n");
+		return;
+	}
+
+	phy->error = 0;
+	phy->suspended = 0;
+	sas_deform_port(phy, 1);
+}
+
+
 /* ---------- Phy class registration ---------- */
 
 int sas_register_phys(struct sas_ha_struct *sas_ha)
@@ -105,6 +124,8 @@ int sas_register_phys(struct sas_ha_struct *sas_ha)
 		[PHYE_OOB_DONE] = sas_phye_oob_done,
 		[PHYE_OOB_ERROR] = sas_phye_oob_error,
 		[PHYE_SPINUP_HOLD] = sas_phye_spinup_hold,
+		[PHYE_RESUME_TIMEOUT] = sas_phye_resume_timeout,
+
 	};
 
 	static const work_func_t sas_port_event_fns[PORT_NUM_EVENTS] = {
diff --git a/drivers/scsi/libsas/sas_port.c b/drivers/scsi/libsas/sas_port.c
index e884a8c..1398b71 100644
--- a/drivers/scsi/libsas/sas_port.c
+++ b/drivers/scsi/libsas/sas_port.c
@@ -39,6 +39,49 @@ static bool phy_is_wideport_member(struct asd_sas_port *port, struct asd_sas_phy
 	return true;
 }
 
+static void sas_resume_port(struct asd_sas_phy *phy)
+{
+	struct domain_device *dev;
+	struct asd_sas_port *port = phy->port;
+	struct sas_ha_struct *sas_ha = phy->ha;
+	struct sas_internal *si = to_sas_internal(sas_ha->core.shost->transportt);
+
+	if (si->dft->lldd_port_formed)
+		si->dft->lldd_port_formed(phy);
+
+	if (port->suspended)
+		port->suspended = 0;
+	else {
+		/* we only need to handle "link returned" actions once */
+		return;
+	}
+
+	/* if the port came back:
+	 * 1/ presume every device came back
+	 * 2/ force the next revalidation to check all expander phys
+	 */
+	list_for_each_entry(dev, &port->dev_list, dev_list_node) {
+		int i, rc;
+
+		rc = sas_notify_lldd_dev_found(dev);
+		if (rc) {
+			sas_unregister_dev(port, dev);
+			continue;
+		}
+
+		if (dev->dev_type == EDGE_DEV || dev->dev_type == FANOUT_DEV) {
+			dev->ex_dev.ex_change_count = -1;
+			for (i = 0; i < dev->ex_dev.num_phys; i++) {
+				struct ex_phy *phy = &dev->ex_dev.ex_phy[i];
+
+				phy->phy_change_count = -1;
+			}
+		}
+	}
+
+	sas_discover_event(port, DISCE_RESUME);
+}
+
 /**
  * sas_form_port -- add this phy to a port
  * @phy: the phy of interest
@@ -58,7 +101,14 @@ static void sas_form_port(struct asd_sas_phy *phy)
 	if (port) {
 		if (!phy_is_wideport_member(port, phy))
 			sas_deform_port(phy, 0);
-		else {
+		else if (phy->suspended) {
+			phy->suspended = 0;
+			sas_resume_port(phy);
+
+			/* phy came back, try to cancel the timeout */
+			wake_up(&sas_ha->eh_wait_q);
+			return;
+		} else {
 			SAS_DPRINTK("%s: phy%d belongs to port%d already(%d)!\n",
 				    __func__, phy->id, phy->port->id,
 				    phy->port->num_phys);
diff --git a/include/scsi/libsas.h b/include/scsi/libsas.h
index ae33706..ef937b5 100644
--- a/include/scsi/libsas.h
+++ b/include/scsi/libsas.h
@@ -79,7 +79,8 @@ enum phy_event {
 	PHYE_OOB_DONE         = 1,
 	PHYE_OOB_ERROR        = 2,
 	PHYE_SPINUP_HOLD      = 3, /* hot plug SATA, no COMWAKE sent */
-	PHY_NUM_EVENTS        = 4,
+	PHYE_RESUME_TIMEOUT   = 4,
+	PHY_NUM_EVENTS        = 5,
 };
 
 enum discover_event {
@@ -87,8 +88,10 @@ enum discover_event {
 	DISCE_REVALIDATE_DOMAIN = 1,
 	DISCE_PORT_GONE         = 2,
 	DISCE_PROBE		= 3,
-	DISCE_DESTRUCT		= 4,
-	DISC_NUM_EVENTS		= 5,
+	DISCE_SUSPEND		= 4,
+	DISCE_RESUME		= 5,
+	DISCE_DESTRUCT		= 6,
+	DISC_NUM_EVENTS		= 7,
 };
 
 /* ---------- Expander Devices ---------- */
@@ -128,7 +131,7 @@ struct ex_phy {
 	u8   attached_sas_addr[SAS_ADDR_SIZE];
 	u8   attached_phy_id;
 
-	u8   phy_change_count;
+	int phy_change_count;
 	enum routing_attribute routing_attr;
 	u8   virtual:1;
 
@@ -141,7 +144,7 @@ struct ex_phy {
 struct expander_device {
 	struct list_head children;
 
-	u16    ex_change_count;
+	int    ex_change_count;
 	u16    max_route_indexes;
 	u8     num_phys;
 
@@ -169,6 +172,7 @@ struct sata_device {
         enum   ata_command_set command_set;
         struct smp_resp        rps_resp; /* report_phy_sata_resp */
         u8     port_no;        /* port number, if this is a PM (Port) */
+	int    pm_result;
 
 	struct ata_port *ap;
 	struct ata_host ata_host;
@@ -182,6 +186,7 @@ struct ssp_device {
 
 enum {
 	SAS_DEV_GONE,
+	SAS_DEV_FOUND, /* device notified to lldd */
 	SAS_DEV_DESTROY,
 	SAS_DEV_EH_PENDING,
 	SAS_DEV_LU_RESET,
@@ -273,6 +278,7 @@ struct asd_sas_port {
 	enum   sas_linkrate linkrate;
 
 	struct sas_work work;
+	int suspended;
 
 /* public: */
 	int id;
@@ -321,6 +327,7 @@ struct asd_sas_phy {
 	unsigned long phy_events_pending;
 
 	int error;
+	int suspended;
 
 	struct sas_phy *phy;
 
@@ -687,6 +694,9 @@ struct sas_domain_function_template {
 
 extern int sas_register_ha(struct sas_ha_struct *);
 extern int sas_unregister_ha(struct sas_ha_struct *);
+extern void sas_prep_resume_ha(struct sas_ha_struct *sas_ha);
+extern void sas_resume_ha(struct sas_ha_struct *sas_ha);
+extern void sas_suspend_ha(struct sas_ha_struct *sas_ha);
 
 int sas_set_phy_speed(struct sas_phy *phy,
 		      struct sas_phy_linkrates *rates);
diff --git a/include/scsi/sas_ata.h b/include/scsi/sas_ata.h
index 2dfbdaa..ff71a56 100644
--- a/include/scsi/sas_ata.h
+++ b/include/scsi/sas_ata.h
@@ -45,6 +45,8 @@ void sas_ata_eh(struct Scsi_Host *shost, struct list_head *work_q,
 void sas_ata_schedule_reset(struct domain_device *dev);
 void sas_ata_wait_eh(struct domain_device *dev);
 void sas_probe_sata(struct asd_sas_port *port);
+void sas_suspend_sata(struct asd_sas_port *port);
+void sas_resume_sata(struct asd_sas_port *port);
 void sas_ata_end_eh(struct ata_port *ap);
 #else
 
@@ -82,6 +84,14 @@ static inline void sas_probe_sata(struct asd_sas_port *port)
 {
 }
 
+static inline void sas_suspend_sata(struct asd_sas_port *port)
+{
+}
+
+static inline void sas_resume_sata(struct asd_sas_port *port)
+{
+}
+
 static inline int sas_get_ata_info(struct domain_device *dev, struct ex_phy *phy)
 {
 	return 0;

[resend PATCH 4/5] isci: implement suspend/resume support

[Dan Williams]

From: Artur Wojcik <artur.wojcik@intel.com>

Provide a "simple-dev-pm-ops" implementation that shuts down the domain
and the device on suspend, and resumes the device and the domain on
resume.  All of the mechanics of restoring domain connectivity are
handled by libsas once isci has notified libsas that all links should be
back up.  libsas is in charge of handling links that did not resume, or
resumed out of order.

Signed-off-by: Artur Wojcik <artur.wojcik@intel.com>
Signed-off-by: Jacek Danecki <jacek.danecki@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
---
 drivers/scsi/isci/host.c |    2 +-
 drivers/scsi/isci/host.h |    2 +-
 drivers/scsi/isci/init.c |   58 +++++++++++++++++++++++++++++++++++++++++++++-
 3 files changed, 59 insertions(+), 3 deletions(-)

diff --git a/drivers/scsi/isci/host.c b/drivers/scsi/isci/host.c
index 45385f5..bc8981e 100644
--- a/drivers/scsi/isci/host.c
+++ b/drivers/scsi/isci/host.c
@@ -1044,7 +1044,7 @@ static enum sci_status sci_controller_start(struct isci_host *ihost,
 	return SCI_SUCCESS;
 }
 
-void isci_host_scan_start(struct Scsi_Host *shost)
+void isci_host_start(struct Scsi_Host *shost)
 {
 	struct isci_host *ihost = SHOST_TO_SAS_HA(shost)->lldd_ha;
 	unsigned long tmo = sci_controller_get_suggested_start_timeout(ihost);
diff --git a/drivers/scsi/isci/host.h b/drivers/scsi/isci/host.h
index 9ab58e0..4911310 100644
--- a/drivers/scsi/isci/host.h
+++ b/drivers/scsi/isci/host.h
@@ -473,7 +473,7 @@ void sci_controller_remote_device_stopped(struct isci_host *ihost,
 
 enum sci_status sci_controller_continue_io(struct isci_request *ireq);
 int isci_host_scan_finished(struct Scsi_Host *, unsigned long);
-void isci_host_scan_start(struct Scsi_Host *);
+void isci_host_start(struct Scsi_Host *);
 u16 isci_alloc_tag(struct isci_host *ihost);
 enum sci_status isci_free_tag(struct isci_host *ihost, u16 io_tag);
 void isci_tci_free(struct isci_host *ihost, u16 tci);
diff --git a/drivers/scsi/isci/init.c b/drivers/scsi/isci/init.c
index 92c1d86..da142a8 100644
--- a/drivers/scsi/isci/init.c
+++ b/drivers/scsi/isci/init.c
@@ -156,7 +156,7 @@ static struct scsi_host_template isci_sht = {
 	.target_alloc			= sas_target_alloc,
 	.slave_configure		= sas_slave_configure,
 	.scan_finished			= isci_host_scan_finished,
-	.scan_start			= isci_host_scan_start,
+	.scan_start			= isci_host_start,
 	.change_queue_depth		= sas_change_queue_depth,
 	.change_queue_type		= sas_change_queue_type,
 	.bios_param			= sas_bios_param,
@@ -722,11 +722,67 @@ static void __devexit isci_pci_remove(struct pci_dev *pdev)
 	}
 }
 
+#ifdef CONFIG_PM
+static int isci_suspend(struct device *dev)
+{
+	struct pci_dev *pdev = to_pci_dev(dev);
+	struct isci_host *ihost;
+	int i;
+
+	for_each_isci_host(i, ihost, pdev) {
+		sas_suspend_ha(&ihost->sas_ha);
+		isci_host_deinit(ihost);
+	}
+
+	pci_save_state(pdev);
+	pci_disable_device(pdev);
+	pci_set_power_state(pdev, PCI_D3hot);
+
+	return 0;
+}
+
+static int isci_resume(struct device *dev)
+{
+	struct pci_dev *pdev = to_pci_dev(dev);
+	struct isci_host *ihost;
+	int rc, i;
+
+	pci_set_power_state(pdev, PCI_D0);
+	pci_restore_state(pdev);
+
+	rc = pcim_enable_device(pdev);
+	if (rc) {
+		dev_err(&pdev->dev,
+			"enabling device failure after resume(%d)\n", rc);
+		return rc;
+	}
+
+	pci_set_master(pdev);
+
+	for_each_isci_host(i, ihost, pdev) {
+		sas_prep_resume_ha(&ihost->sas_ha);
+
+		isci_host_init(ihost);
+		isci_host_start(ihost->sas_ha.core.shost);
+		wait_for_start(ihost);
+
+		sas_resume_ha(&ihost->sas_ha);
+	}
+
+	return 0;
+}
+
+static SIMPLE_DEV_PM_OPS(isci_pm_ops, isci_suspend, isci_resume);
+#endif
+
 static struct pci_driver isci_pci_driver = {
 	.name		= DRV_NAME,
 	.id_table	= isci_id_table,
 	.probe		= isci_pci_probe,
 	.remove		= __devexit_p(isci_pci_remove),
+#ifdef CONFIG_PM
+	.driver.pm      = &isci_pm_ops,
+#endif
 };
 
 static __init int isci_init(void)

[resend PATCH 5/5] libsas, ipr: cleanup ata_host flags initialization via ata_host_init

[Dan Williams]

libsas and ipr pass flags to ata_host_init that are meant for the port.

ata_host flags:
	ATA_HOST_SIMPLEX	= (1 << 0),	/* Host is simplex, one DMA channel per host only */
	ATA_HOST_STARTED	= (1 << 1),	/* Host started */
	ATA_HOST_PARALLEL_SCAN	= (1 << 2),	/* Ports on this host can be scanned in parallel */
	ATA_HOST_IGNORE_ATA	= (1 << 3),	/* Ignore ATA devices on this host. */

flags passed by libsas:
	ATA_FLAG_SATA		= (1 << 1),
	ATA_FLAG_PIO_DMA	= (1 << 7), /* PIO cmds via DMA */
	ATA_FLAG_NCQ		= (1 << 10), /* host supports NCQ */

The only one that aliases is ATA_HOST_STARTED which is a 'don't care' in
the libsas and ipr cases since ata_hosts from these sources are not
registered with libata.

Cc: Brian King <brking@us.ibm.com>
Reported-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
---
 drivers/ata/libata-core.c     |   10 ++--------
 drivers/scsi/ipr.c            |    3 +--
 drivers/scsi/libsas/sas_ata.c |    5 +----
 include/linux/libata.h        |    3 +--
 4 files changed, 5 insertions(+), 16 deletions(-)

diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index da31691..6aa72b8 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -5958,24 +5958,18 @@ int ata_host_start(struct ata_host *host)
 }
 
 /**
- *	ata_sas_host_init - Initialize a host struct
+ *	ata_sas_host_init - Initialize a host struct for sas (ipr, libsas)
  *	@host:	host to initialize
  *	@dev:	device host is attached to
- *	@flags:	host flags
  *	@ops:	port_ops
  *
- *	LOCKING:
- *	PCI/etc. bus probe sem.
- *
  */
-/* KILLME - the only user left is ipr */
 void ata_host_init(struct ata_host *host, struct device *dev,
-		   unsigned long flags, struct ata_port_operations *ops)
+		   struct ata_port_operations *ops)
 {
 	spin_lock_init(&host->lock);
 	mutex_init(&host->eh_mutex);
 	host->dev = dev;
-	host->flags = flags;
 	host->ops = ops;
 }
 
diff --git a/drivers/scsi/ipr.c b/drivers/scsi/ipr.c
index 467dc38..dacc784 100644
--- a/drivers/scsi/ipr.c
+++ b/drivers/scsi/ipr.c
@@ -8775,8 +8775,7 @@ static int __devinit ipr_probe_ioa(struct pci_dev *pdev,
 
 	ioa_cfg = (struct ipr_ioa_cfg *)host->hostdata;
 	memset(ioa_cfg, 0, sizeof(struct ipr_ioa_cfg));
-	ata_host_init(&ioa_cfg->ata_host, &pdev->dev,
-		      sata_port_info.flags, &ipr_sata_ops);
+	ata_host_init(&ioa_cfg->ata_host, &pdev->dev, &ipr_sata_ops);
 
 	ioa_cfg->ipr_chip = ipr_get_chip_info(dev_id);
 
diff --git a/drivers/scsi/libsas/sas_ata.c b/drivers/scsi/libsas/sas_ata.c
index 4208e16..5d10e4d 100644
--- a/drivers/scsi/libsas/sas_ata.c
+++ b/drivers/scsi/libsas/sas_ata.c
@@ -580,10 +580,7 @@ int sas_ata_init(struct domain_device *found_dev)
 	struct ata_port *ap;
 	int rc;
 
-	ata_host_init(&found_dev->sata_dev.ata_host,
-		      ha->dev,
-		      sata_port_info.flags,
-		      &sas_sata_ops);
+	ata_host_init(&found_dev->sata_dev.ata_host, ha->dev, &sas_sata_ops);
 	ap = ata_sas_port_alloc(&found_dev->sata_dev.ata_host,
 				&sata_port_info,
 				shost);
diff --git a/include/linux/libata.h b/include/linux/libata.h
index af467d3..baf9f82 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -990,8 +990,7 @@ extern int ata_host_activate(struct ata_host *host, int irq,
 			     irq_handler_t irq_handler, unsigned long irq_flags,
 			     struct scsi_host_template *sht);
 extern void ata_host_detach(struct ata_host *host);
-extern void ata_host_init(struct ata_host *, struct device *,
-			  unsigned long, struct ata_port_operations *);
+extern void ata_host_init(struct ata_host *, struct device *, struct ata_port_operations *);
 extern int ata_scsi_detect(struct scsi_host_template *sht);
 extern int ata_scsi_ioctl(struct scsi_device *dev, int cmd, void __user *arg);
 extern int ata_scsi_queuecmd(struct Scsi_Host *h, struct scsi_cmnd *cmd);

Re: [resend PATCH 1/5] libata: reset once

[Jeff Garzik]

On 07/10/2012 12:05 AM, Dan Williams wrote:
> Hotplug testing with libsas currently encounters a 55 second wait for
> link recovery to give up.  In the case where the user trusts the
> response time of their devices permit the recovery attempts to be
> limited to one.
>
> Signed-off-by: Dan Williams <dan.j.williams@intel.com>

Acked-by: Jeff Garzik <jgarzik@redhat.com>

Re: [resend PATCH 2/5] libata: export ata_port suspend/resume infrastructure for sas

[Jeff Garzik]

On 07/10/2012 12:05 AM, Dan Williams wrote:
> Reuse ata_port_{suspend|resume}_common for sas.  This path is chosen
> over adding coordination between ata-tranport and sas-transport because
> libsas wants to revalidate the domain at resume-time at the host level.
> It can not validate links have resumed properly until libata has had a
> chance to perform its revalidation, and any sane placing of an ata_port
> in the sas-transport model would delay it's resumption until after the
> host.
>
> Export the common portion of port suspend/resume (bypass pm_runtime),
> and allow sas to perform these operations asynchronously (similar to the
> libsas async-ata probe implmentation).  Async operation is determined by
> having an external, rather than stack based, location for storing the
> result of the operation.
>
> Reviewed-by: Jacek Danecki <jacek.danecki@intel.com>
> Signed-off-by: Dan Williams <dan.j.williams@intel.com>

Acked-by: Jeff Garzik <jgarzik@redhat.com>

Re: [resend PATCH 5/5] libsas, ipr: cleanup ata_host flags initialization via ata_host_init

[Jeff Garzik]

On 07/10/2012 12:06 AM, Dan Williams wrote:
> libsas and ipr pass flags to ata_host_init that are meant for the port.
>
> ata_host flags:
> 	ATA_HOST_SIMPLEX	= (1 << 0),	/* Host is simplex, one DMA channel per host only */
> 	ATA_HOST_STARTED	= (1 << 1),	/* Host started */
> 	ATA_HOST_PARALLEL_SCAN	= (1 << 2),	/* Ports on this host can be scanned in parallel */
> 	ATA_HOST_IGNORE_ATA	= (1 << 3),	/* Ignore ATA devices on this host. */
>
> flags passed by libsas:
> 	ATA_FLAG_SATA		= (1 << 1),
> 	ATA_FLAG_PIO_DMA	= (1 << 7), /* PIO cmds via DMA */
> 	ATA_FLAG_NCQ		= (1 << 10), /* host supports NCQ */
>
> The only one that aliases is ATA_HOST_STARTED which is a 'don't care' in
> the libsas and ipr cases since ata_hosts from these sources are not
> registered with libata.
>
> Cc: Brian King <brking@us.ibm.com>
> Reported-by: Hannes Reinecke <hare@suse.com>
> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
> ---
>   drivers/ata/libata-core.c     |   10 ++--------
>   drivers/scsi/ipr.c            |    3 +--
>   drivers/scsi/libsas/sas_ata.c |    5 +----
>   include/linux/libata.h        |    3 +--

Acked-by: Jeff Garzik <jgarzik@redhat.com>

Re: [resend PATCH 5/5] libsas, ipr: cleanup ata_host flags initialization via ata_host_init

[Brian King]

On 07/09/2012 11:06 PM, Dan Williams wrote:
> libsas and ipr pass flags to ata_host_init that are meant for the port.
> 
> ata_host flags:
> 	ATA_HOST_SIMPLEX	= (1 << 0),	/* Host is simplex, one DMA channel per host only */
> 	ATA_HOST_STARTED	= (1 << 1),	/* Host started */
> 	ATA_HOST_PARALLEL_SCAN	= (1 << 2),	/* Ports on this host can be scanned in parallel */
> 	ATA_HOST_IGNORE_ATA	= (1 << 3),	/* Ignore ATA devices on this host. */
> 
> flags passed by libsas:
> 	ATA_FLAG_SATA		= (1 << 1),
> 	ATA_FLAG_PIO_DMA	= (1 << 7), /* PIO cmds via DMA */
> 	ATA_FLAG_NCQ		= (1 << 10), /* host supports NCQ */
> 
> The only one that aliases is ATA_HOST_STARTED which is a 'don't care' in
> the libsas and ipr cases since ata_hosts from these sources are not
> registered with libata.
> 
> Cc: Brian King <brking@us.ibm.com>
> Reported-by: Hannes Reinecke <hare@suse.com>
> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
> ---
>  drivers/ata/libata-core.c     |   10 ++--------
>  drivers/scsi/ipr.c            |    3 +--
>  drivers/scsi/libsas/sas_ata.c |    5 +----
>  include/linux/libata.h        |    3 +--

Acked-by: Brian King <brking@linux.vnet.ibm.com>

-- 
Brian King
Power Linux I/O
IBM Linux Technology Center