RE: [PATCH v2 0/4] io_uring iopoll in scsi layer

[Kashyap Desai <kashyap.desai@broadcom.com>]

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Hi Martin,

Due to some issue in RCU lock (only in debugging environments),  there was
booting issue and shared host tag support of megaraid_sas driver is revert
backed in 5.10 -
https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit
/?id=1a0e1943d8798cb3241fb5edb9a836af1611b60a

== Commit message ==
It turns out that it causes long boot-time latencies (to the point of
timeouts and failed boots).

The cause is the increase in request queues, and a fix for that is queued
up for 5.11, but we're reverting this commit that triggered the problem
for now.
==

Can you include this patch set for 5.11 ?  I see (origin/5.11/scsi-queue)
has below change set. It looks like you have already queued up "shared
host tag feature for 5.11"

git log --oneline drivers/scsi/megaraid/
498854102c1c scsi: megaraid_sas: Update function description
977001df0368 scsi: megaraid_sas: Use generic power management
8ed9d987c6d9 scsi: megaraid_sas: Drop PCI wakeup calls from .resume
bba84aeccafb scsi: megaraid_sas: Simplify compat_ioctl handling
381d34e376e3 scsi: megaraid_sas: Check user-provided offsets
55e0500eb5c0 Merge tag 'scsi-misc' of
git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi
103fbf8e4020 scsi: megaraid_sas: Added support for shared host tagset for
cpuhotplug
62aa501dc9dd scsi: megaraid: Make smp_affinity_enable static


Kashyap

> -----Original Message-----
> From: Kashyap Desai [mailto:kashyap.desai@broadcom.com]
> Sent: Thursday, December 3, 2020 9:11 AM
> To: linux-scsi@vger.kernel.org
> Cc: Kashyap Desai <kashyap.desai@broadcom.com>
> Subject: [PATCH v2 0/4] io_uring iopoll in scsi layer
>
> This patch series is to support io_uring iopoll feature in scsi stack.
This patch
> set requires shared hosttag support.
>
> This patch set is created on top of for-next branch of
>
https://kernel.googlesource.com/pub/scm/linux/kernel/git/axboe/linux-block
>
> v2 ->
> - updated feedback from v1.
> - add reviewed-by & tested-by tag
> - remove flood of prints in scsi_debug driver during iopoll
>   reported by Douglas Gilbert.
> - added new patch to support to get shost from hctx.
>   added new helper function "scsi_init_hctx"
>
> v1 ->
> Fixed warnings in scsi_debug driver.
> Reported-by: kernel test robot <lkp@intel.com>
>
> Kashyap Desai (4):
>   add io_uring with IOPOLL support in scsi layer
>   megaraid_sas: iouring iopoll support
>   scsi_debug : iouring iopoll support
>   scsi: set shost as hctx driver_data
>
>  drivers/scsi/megaraid/megaraid_sas.h        |   2 +
>  drivers/scsi/megaraid/megaraid_sas_base.c   |  90 ++++++++++++--
>  drivers/scsi/megaraid/megaraid_sas_fusion.c |  43 ++++++-
>  drivers/scsi/megaraid/megaraid_sas_fusion.h |   3 +
>  drivers/scsi/scsi_debug.c                   | 130 ++++++++++++++++++++
>  drivers/scsi/scsi_lib.c                     |  28 ++++-
>  include/scsi/scsi_cmnd.h                    |   1 +
>  include/scsi/scsi_host.h                    |  11 ++
>  8 files changed, 294 insertions(+), 14 deletions(-)
>
>
> base-commit: 0eedceafd3a63fd082743c914853ef4b9247dbe6
> --
> 2.18.1

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