From: Daniel Wagner <dwagner@suse.de>
To: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: linux-scsi@vger.kernel.org,
Finn Thain <fthain@telegraphics.com.au>,
GR-QLogic-Storage-Upstream@marvell.com,
Hannes Reinecke <hare@kernel.org>,
Jack Wang <jinpu.wang@cloud.ionos.com>,
John Garry <john.garry@huawei.com>,
linux-m68k@lists.linux-m68k.org,
Manish Rangankar <mrangankar@marvell.com>,
Michael Schmitz <schmitzmic@gmail.com>,
MPT-FusionLinux.pdl@broadcom.com,
Nilesh Javali <njavali@marvell.com>,
Sathya Prakash <sathya.prakash@broadcom.com>,
Sreekanth Reddy <sreekanth.reddy@broadcom.com>,
Suganath Prabu Subramani <suganath-prabu.subramani@broadcom.com>,
Vikram Auradkar <auradkar@google.com>,
Xiang Chen <chenxiang66@hisilicon.com>,
Xiaofei Tan <tanxiaofei@huawei.com>,
"James E . J . Bottomley" <jejb@linux.ibm.com>,
"Martin K . Petersen" <martin.petersen@oracle.com>,
Thomas Gleixner <tglx@linutronix.de>,
"Ahmed S . Darwish" <a.darwish@linutronix.de>
Subject: Re: [PATCH 08/14] scsi: qla4xxx: qla4_82xx_rom_lock(): Remove in_interrupt().
Date: Mon, 30 Nov 2020 15:33:34 +0100 [thread overview]
Message-ID: <20201130143334.b4x6y7qejsvlxeag@beryllium.lan> (raw)
In-Reply-To: <20201126132952.2287996-9-bigeasy@linutronix.de>
On Thu, Nov 26, 2020 at 02:29:46PM +0100, Sebastian Andrzej Siewior wrote:
> From: "Ahmed S. Darwish" <a.darwish@linutronix.de>
>
> qla4_82xx_rom_lock() spins on a certain hardware state until it is
> updated. At the end of each spin, if in_interrupt() is true, it does 20
> loops of cpu_relax(). Otherwise, it yields the CPU.
>
> While in_interrupt() is ill-defined and does not provide what the name
> suggests, it is not needed here: qla4_82xx_rom_lock() is always called
> from process context. Below is an analysis of its callers:
>
> - ql4_nx.c: qla4_82xx_rom_fast_read(), all process context callers:
> => ql4_nx.c: qla4_82xx_pinit_from_rom(), GFP_KERNEL allocation
> => ql4_nx.c: qla4_82xx_load_from_flash(), msleep() in a loop
>
> - ql4_nx.c: qla4_82xx_pinit_from_rom(), earlier discussed
>
> - ql4_nx.c: qla4_82xx_rom_lock_recovery(), bound to "isp_operations"
> ->rom_lock_recovery() hook, which has one process context caller,
> qla4_8xxx_device_bootstrap(), with callers:
> => ql4_83xx.c: qla4_83xx_need_reset_handler(), process, msleep()
> => ql4_nx.c: qla4_8xxx_device_state_handler(), multiple msleep()s
>
> - ql4_nx.c: qla4_82xx_read_flash_data(), has cond_resched()
>
> Remove the in_interrupt() check. Mark, qla4_82xx_rom_lock(), and the
> ->rom_lock_recovery() hook, with "Context: task, can sleep".
>
> Change qla4_82xx_rom_lock() implementation to sleep 20ms, instead of a
> schedule(), for each spin. This is more deterministic, and it matches
> the other implementations bound to ->rom_lock_recovery().
>
> Signed-off-by: Ahmed S. Darwish <a.darwish@linutronix.de>
> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
> Cc: Nilesh Javali <njavali@marvell.com>
> Cc: Manish Rangankar <mrangankar@marvell.com>
> Cc: <GR-QLogic-Storage-Upstream@marvell.com>
Reviewed-by: Daniel Wagner <dwagner@suse.de>
next prev parent reply other threads:[~2020-11-30 14:34 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-26 13:29 [PATCH 00/14] scsi: Remove in_interrupt() usage Sebastian Andrzej Siewior
2020-11-26 13:29 ` [PATCH 01/14] scsi: pm80xx: Do not sleep in atomic context Sebastian Andrzej Siewior
2020-11-26 13:58 ` Jinpu Wang
2020-11-26 13:29 ` [PATCH 02/14] scsi: hisi_sas: Remove preemptible() Sebastian Andrzej Siewior
2020-11-26 14:10 ` John Garry
2020-11-26 13:29 ` [PATCH 03/14] scsi: qla4xxx: qla4_82xx_crb_win_lock(): Remove in_interrupt() Sebastian Andrzej Siewior
2020-11-30 13:54 ` Daniel Wagner
2020-11-26 13:29 ` [PATCH 04/14] scsi: qla2xxx: qla82xx: " Sebastian Andrzej Siewior
2020-11-30 10:59 ` Daniel Wagner
2020-11-30 19:11 ` Himanshu Madhani
2020-11-26 13:29 ` [PATCH 05/14] scsi: qla2xxx: tcm_qla2xxx: Remove BUG_ON(in_interrupt()) Sebastian Andrzej Siewior
2020-11-30 11:02 ` Daniel Wagner
2020-11-30 19:13 ` Himanshu Madhani
2020-11-26 13:29 ` [PATCH 06/14] scsi: qla2xxx: init/os: Remove in_interrupt() Sebastian Andrzej Siewior
2020-11-30 13:26 ` Daniel Wagner
2020-11-30 19:14 ` Himanshu Madhani
2020-11-26 13:29 ` [PATCH 07/14] scsi: qla4xxx: qla4_82xx_idc_lock(): " Sebastian Andrzej Siewior
2020-11-30 14:20 ` Daniel Wagner
2020-11-26 13:29 ` [PATCH 08/14] scsi: qla4xxx: qla4_82xx_rom_lock(): " Sebastian Andrzej Siewior
2020-11-30 14:33 ` Daniel Wagner [this message]
2020-11-26 13:29 ` [PATCH 09/14] scsi: mpt3sas: " Sebastian Andrzej Siewior
2020-11-30 15:16 ` Daniel Wagner
2020-11-26 13:29 ` [PATCH 10/14] scsi: myrb: Remove WARN_ON(in_interrupt()) Sebastian Andrzej Siewior
2020-11-30 15:21 ` Daniel Wagner
2020-11-26 13:29 ` [PATCH 11/14] scsi: myrs: " Sebastian Andrzej Siewior
2020-11-30 15:21 ` Daniel Wagner
2020-11-26 13:29 ` [PATCH 12/14] scsi: NCR5380: Remove in_interrupt() Sebastian Andrzej Siewior
2020-11-27 4:37 ` Finn Thain
2020-11-27 21:15 ` Finn Thain
2020-11-27 21:48 ` Finn Thain
2020-11-28 7:28 ` Ahmed S. Darwish
2020-11-30 0:21 ` Finn Thain
2020-11-29 6:54 ` Michael Schmitz
2020-11-30 0:15 ` Finn Thain
2020-11-30 2:42 ` Michael Schmitz
2020-11-26 13:29 ` [PATCH 13/14] scsi: message: fusion: Remove in_interrupt() usage in mpt_config() Sebastian Andrzej Siewior
2020-11-30 15:30 ` Daniel Wagner
2020-11-26 13:29 ` [PATCH 14/14] scsi: message: fusion: Remove in_interrupt() usage in mptsas_cleanup_fw_event_q() Sebastian Andrzej Siewior
2020-11-30 16:07 ` Daniel Wagner
2020-12-01 5:06 ` [PATCH 00/14] scsi: Remove in_interrupt() usage Martin K. Petersen
2020-12-01 9:08 ` Sebastian Andrzej Siewior
2020-12-08 4:51 ` Martin K. Petersen
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