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Date: Fri, 14 Jul 2017 08:53:03 +0200
From: Hannes Reinecke <hare@...e.de>
To: Yijing Wang <wangyijing@...wei.com>, jejb@...ux.vnet.ibm.com,
martin.petersen@...cle.com
Cc: chenqilin2@...wei.com, hare@...e.com, linux-scsi@...r.kernel.org,
linux-kernel@...r.kernel.org, chenxiang66@...ilicon.com,
huangdaode@...ilicon.com, wangkefeng.wang@...wei.com,
zhaohongjiang@...wei.com, dingtianhong@...wei.com,
guohanjun@...wei.com, yanaijie@...wei.com, hch@....de,
dan.j.williams@...el.com, emilne@...hat.com, thenzl@...hat.com,
wefu@...hat.com, charles.chenxin@...wei.com,
chenweilong@...wei.com, john.garry@...wei.com,
Johannes Thumshirn <jthumshirn@...e.de>
Subject: Re: [PATCH v3 6/7] libsas: add wait-complete support to sync
discovery event
On 07/10/2017 09:06 AM, Yijing Wang wrote:
> Introduce a sync flag to tag discovery event whether need to
> sync execute, per-event wait-complete ensure sync.
>
> Signed-off-by: Yijing Wang <wangyijing@...wei.com>
> CC: John Garry <john.garry@...wei.com>
> CC: Johannes Thumshirn <jthumshirn@...e.de>
> CC: Ewan Milne <emilne@...hat.com>
> CC: Christoph Hellwig <hch@....de>
> CC: Tomas Henzl <thenzl@...hat.com>
> CC: Dan Williams <dan.j.williams@...el.com>
> ---
> drivers/scsi/libsas/sas_discover.c | 8 ++++++--
> drivers/scsi/libsas/sas_expander.c | 12 +++++++++++-
> drivers/scsi/libsas/sas_internal.h | 27 +++++++++++++++++++++++++++
> include/scsi/libsas.h | 2 ++
> 4 files changed, 46 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/scsi/libsas/sas_discover.c b/drivers/scsi/libsas/sas_discover.c
> index a25d648..d68f8dd 100644
> --- a/drivers/scsi/libsas/sas_discover.c
> +++ b/drivers/scsi/libsas/sas_discover.c
> @@ -378,6 +378,7 @@ void sas_unregister_dev(struct asd_sas_port *port, struct domain_device *dev)
> list_del_init(&dev->disco_list_node);
> sas_rphy_free(dev->rphy);
> sas_unregister_common_dev(port, dev);
> + sas_disc_cancel_sync(&port->disc.disc_work[DISCE_DESTRUCT]);
> return;
> }
>
> @@ -541,6 +542,7 @@ static void sas_discover_common_fn(struct work_struct *work)
> struct asd_sas_port *port = ev->port;
>
> sas_event_fns[ev->type](work);
> + sas_disc_wakeup(ev);
> sas_port_put(port);
> }
>
> @@ -571,8 +573,10 @@ static void sas_chain_work(struct sas_ha_struct *ha, struct sas_work *sw)
> else
> ret = scsi_queue_work(ha->core.shost, &sw->work);
>
> - if (ret != 1)
> + if (ret != 1) {
> sas_port_put(port);
> + sas_disc_cancel_sync(ev);
> + }
> }
>
> static void sas_chain_event(int event, unsigned long *pending,
> @@ -592,9 +596,9 @@ int sas_discover_event(struct asd_sas_port *port, enum discover_event ev)
> {
> struct sas_discovery *disc;
>
> + disc = &port->disc;
> if (!port)
> return 0;
> - disc = &port->disc;
>
> BUG_ON(ev >= DISC_NUM_EVENTS);
>
> diff --git a/drivers/scsi/libsas/sas_expander.c b/drivers/scsi/libsas/sas_expander.c
> index 570b2cb..9d26c28 100644
> --- a/drivers/scsi/libsas/sas_expander.c
> +++ b/drivers/scsi/libsas/sas_expander.c
> @@ -822,14 +822,18 @@ static struct domain_device *sas_ex_discover_end_dev(
>
> list_add_tail(&child->disco_list_node, &parent->port->disco_list);
>
> + sas_disc_wait_init(child->port, DISCE_PROBE);
> res = sas_discover_sata(child);
> if (res) {
> + sas_disc_cancel_sync(&child->port->disc.disc_work[DISCE_PROBE]);
> SAS_DPRINTK("sas_discover_sata() for device %16llx at "
> "%016llx:0x%x returned 0x%x\n",
> SAS_ADDR(child->sas_addr),
> SAS_ADDR(parent->sas_addr), phy_id, res);
> goto out_list_del;
> }
> + sas_disc_wait_completion(child->port, DISCE_PROBE);
> +
> } else
> #endif
> if (phy->attached_tproto & SAS_PROTOCOL_SSP) {
> @@ -847,14 +851,17 @@ static struct domain_device *sas_ex_discover_end_dev(
>
> list_add_tail(&child->disco_list_node, &parent->port->disco_list);
>
> + sas_disc_wait_init(child->port, DISCE_PROBE);
> res = sas_discover_end_dev(child);
> if (res) {
> + sas_disc_cancel_sync(&child->port->disc.disc_work[DISCE_PROBE]);
> SAS_DPRINTK("sas_discover_end_dev() for device %16llx "
> "at %016llx:0x%x returned 0x%x\n",
> SAS_ADDR(child->sas_addr),
> SAS_ADDR(parent->sas_addr), phy_id, res);
> goto out_list_del;
> }
> + sas_disc_wait_completion(child->port, DISCE_PROBE);
> } else {
> SAS_DPRINTK("target proto 0x%x at %016llx:0x%x not handled\n",
> phy->attached_tproto, SAS_ADDR(parent->sas_addr),
> @@ -1890,8 +1897,11 @@ static void sas_unregister_devs_sas_addr(struct domain_device *parent,
> if (child->dev_type == SAS_EDGE_EXPANDER_DEVICE ||
> child->dev_type == SAS_FANOUT_EXPANDER_DEVICE)
> sas_unregister_ex_tree(parent->port, child);
> - else
> + else {
> + sas_disc_wait_init(parent->port, DISCE_DESTRUCT);
> sas_unregister_dev(parent->port, child);
> + sas_disc_wait_completion(parent->port, DISCE_DESTRUCT);
> + }
> found = child;
> break;
> }
> diff --git a/drivers/scsi/libsas/sas_internal.h b/drivers/scsi/libsas/sas_internal.h
> index 890b5d26..09a9b10 100644
> --- a/drivers/scsi/libsas/sas_internal.h
> +++ b/drivers/scsi/libsas/sas_internal.h
> @@ -134,6 +134,33 @@ static inline void sas_port_get(struct asd_sas_port *port)
> kref_get(&port->ref);
> }
>
> +static inline void sas_disc_cancel_sync(struct sas_discovery_event *event)
> +{
> + event->is_sync = false;
> +}
> +
> +static inline void sas_disc_wakeup(struct sas_discovery_event *event)
> +{
> + if (event->is_sync)
> + complete(&event->completion);
> +}
> +
> +static inline void sas_disc_wait_init(struct asd_sas_port *port,
> + enum discover_event event)
> +{
> + port->disc.disc_work[event].is_sync = true;
> + init_completion(&port->disc.disc_work[event].completion);
> +}
> +
> +static inline void sas_disc_wait_completion(struct asd_sas_port *port,
> + enum discover_event event)
> +{
> + if (port->disc.disc_work[event].is_sync) {
> + wait_for_completion(&port->disc.disc_work[event].completion);
> + port->disc.disc_work[event].is_sync = false;
> + }
> +}
> +
> #ifdef CONFIG_SCSI_SAS_HOST_SMP
> extern int sas_smp_host_handler(struct Scsi_Host *shost, struct request *req,
> struct request *rsp);
> diff --git a/include/scsi/libsas.h b/include/scsi/libsas.h
> index 4bcb9fe..21e9fb140 100644
> --- a/include/scsi/libsas.h
> +++ b/include/scsi/libsas.h
> @@ -243,6 +243,8 @@ struct sas_discovery_event {
> struct sas_work work;
> struct asd_sas_port *port;
> enum discover_event type;
> + bool is_sync;
> + struct completion completion;
> };
>
> static inline struct sas_discovery_event *to_sas_discovery_event(struct work_struct *work)
>
Some comments as the earlier patch: please use DECLARE_COMPETION_ONSTACK
here.
Cheers,
Hannes
--
Dr. Hannes Reinecke Teamlead Storage & Networking
hare@...e.de +49 911 74053 688
SUSE LINUX GmbH, Maxfeldstr. 5, 90409 Nürnberg
GF: F. Imendörffer, J. Smithard, J. Guild, D. Upmanyu, G. Norton
HRB 21284 (AG Nürnberg)
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