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SubjectRe: [PATCH v4 00/11] Enhance libsas hotplug feature
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On 06/09/2017 10:15, Jason Yan wrote:
> Hello all, Yijing Wang handed over this topic to me. We are working
> on it the last two months. We have tested the patchset for a long
> time. Here is the new version.
>
> Now the libsas hotplug has some issues, Dan Williams report
> a similar bug here before
> https://www.mail-archive.com/linux-scsi@vger.kernel.org/msg39187.html
>
> The issues we have found
> 1. if LLDD burst reports lots of phy-up/phy-down sas events, some events
> may lost because a same sas events is pending now, finally libsas topo
> may different the hardware.
> 2. receive a phy down sas event, libsas call sas_deform_port to remove
> devices, it would first delete the sas port, then put a destruction
> discovery event in a new work, and queue it at the tail of workqueue,
> once the sas port be deleted, its children device will be deleted too,
> when the destruction work start, it will found the target device has
> been removed, and report a sysfs warnning.
> 3. since a hotplug process will be divided into several works, if a phy up
> sas event insert into phydown works, like
> destruction work ---> PORTE_BYTES_DMAED (sas_form_port) ---->PHYE_LOSS_OF_SIGNAL
> the hot remove flow would broken by PORTE_BYTES_DMAED event, it's not
> we expected, and issues would occur.
>
> v3->v4: -get rid of unused ha event and do some cleanup
> -use dynamic alloced work and support shutting down the phy if active event reached the threshold
> -use flush_workqueue instead of wait-completion to process discover events synchronously
> -direct call probe and destruct function
> -other small code improvements
> v2->v3: some code improvements suggested by Johannes and John,
> split v2 patch 2 into several small patches.
> v1->v2: some code improvements suggested by John Garry
>
> Jason Yan (10):
> libsas: kill useless ha_event and do some cleanup
> libsas: remove the numbering for each event enum
> libsas: remove unused port_gone_completion and DISCE_PORT_GONE
> libsas: rename notify_port_event() for consistency
> libsas: Use dynamic alloced work to avoid sas event lost
> libsas: shut down the PHY if events reached the threshold
> libsas: make the event threshold configurable
> libsas: Use new workqueue to run sas event and disco event
> libsas: libsas: use flush_workqueue to process disco events
> synchronously
> libsas: direct call probe and destruct
>
> chenxiang (1):
> libsas: add event to defer list tail instead of head when draining
>

Regardless of the fate of the rest of the patches in this series, I
think patches 1,2,3,4,11/11 can be taken in isolation (subject to
review, of course). It would save maintaining them out-of-tree.

John

> drivers/scsi/aic94xx/aic94xx_hwi.c | 3 -
> drivers/scsi/hisi_sas/hisi_sas_main.c | 7 ++-
> drivers/scsi/libsas/sas_ata.c | 1 -
> drivers/scsi/libsas/sas_discover.c | 36 +++++++-----
> drivers/scsi/libsas/sas_dump.c | 10 ----
> drivers/scsi/libsas/sas_dump.h | 1 -
> drivers/scsi/libsas/sas_event.c | 97 +++++++++++++++++++-------------
> drivers/scsi/libsas/sas_expander.c | 2 +-
> drivers/scsi/libsas/sas_init.c | 101 +++++++++++++++++++++++++++++-----
> drivers/scsi/libsas/sas_internal.h | 7 +++
> drivers/scsi/libsas/sas_phy.c | 73 ++++++++++++------------
> drivers/scsi/libsas/sas_port.c | 25 +++++----
> include/scsi/libsas.h | 81 ++++++++++++---------------
> include/scsi/scsi_transport_sas.h | 1 +
> 14 files changed, 270 insertions(+), 175 deletions(-)
>


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