linux-kernel - Re: Broadcom 9460 raid card takes too long at system resuming

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Message-ID: <CABTNMG3MZ3rDQjG1xanPiuHik=teHStr+ze1Zzz6zuiewq-JgQ@mail.gmail.com>
Date:   Wed, 21 Apr 2021 17:55:52 +0800
From:   Chris Chiu <chris.chiu@...onical.com>
To:     Kashyap Desai <kashyap.desai@...adcom.com>
Cc:     Sumit Saxena <sumit.saxena@...adcom.com>,
        Shivasharan Srikanteshwara 
        <shivasharan.srikanteshwara@...adcom.com>,
        "PDL,MEGARAIDLINUX" <megaraidlinux.pdl@...adcom.com>,
        linux-scsi@...r.kernel.org,
        Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: Broadcom 9460 raid card takes too long at system resuming

On Tue, Apr 20, 2021 at 9:21 PM Kashyap Desai
<kashyap.desai@...adcom.com> wrote:
>
> Hi Chris -
>
> Most likely behavior you explained is associated with how much time FW takes
> to be activated.
> In case of actual init from fresh boot, FW is already started running once
> system is powered on, and user may not be aware of it.
> By the time OS boot reach driver load from fresh boot, there was enough time
> spend in system bring up.This is not true in case of resume (Hibernation.).
>
> Kashyap
>
Thanks for the prompt response.

Chris

> > -----Original Message-----
> > From: Chris Chiu [mailto:chris.chiu@...onical.com]
> > Sent: Monday, April 19, 2021 3:45 PM
> > To: kashyap.desai@...adcom.com; sumit.saxena@...adcom.com;
> > shivasharan.srikanteshwara@...adcom.com;
> > megaraidlinux.pdl@...adcom.com
> > Cc: linux-scsi@...r.kernel.org; Linux Kernel
> > <linux-kernel@...r.kernel.org>
> > Subject: Broadcom 9460 raid card takes too long at system resuming
> >
> > Hi,
> >     We found that the Broadcom 9460 RAID card will take ~40 seconds in
> > megasas_resume. It is mainly waiting for the FW to come to ready state,
> > please refer to the following kernel log. The FW version is
> > "megasas: 07.714.04.00-rc1". It seems that the
> > megasas_transition_to_ready() loop costs ~40 seconds in megasas_resume.
> > However, the same megasas_transition_to_ready() function only takes a few
> > milliseconds to complete in megasas_init_fw(). The .read_fw_status_reg
> > maps
> > to megasas_read_fw_status_reg_fusion. I tried to add
> > pci_enable_device_mem() and pci_set_master before
> > megasas_transition_to_ready() in megasas_resume() but it makes no
> > difference.
> >
> > I don't really know what makes the difference between driver probe and
> > resume. The lspci information of the raid controller is here
> > https://gist.github.com/mschiu77/e74ec084cc925643add845fa4dc31ab6.
> > Any suggestions about what I can do to find out the cause? Thanks.
> >
> > [   62.357688] megaraid_sas 0000:45:00.0: megasas_resume is called
> > [   62.357719] megaraid_sas 0000:45:00.0: Waiting for FW to come to ready
> > state
> > [  104.382571] megaraid_sas 0000:45:00.0: FW now in Ready state [
> > 104.382576] megaraid_sas 0000:45:00.0: 63 bit DMA mask and 63 bit
> > consistent mask [  104.383350] megaraid_sas 0000:45:00.0:
> > requested/available msix 33/33 [  104.383669] megaraid_sas 0000:45:00.0:
> > Performance mode :Latency
> > [  104.383671] megaraid_sas 0000:45:00.0: FW supports sync cache        :
> > Yes
> > [  104.383677] megaraid_sas 0000:45:00.0: megasas_disable_intr_fusion is
> > called outbound_intr_mask:0x40000009 [  104.550570] megaraid_sas
> > 0000:45:00.0: FW provided
> > supportMaxExtLDs: 1       max_lds: 64
> > [  104.550574] megaraid_sas 0000:45:00.0: controller type       :
> > MR(4096MB)
> > [  104.550575] megaraid_sas 0000:45:00.0: Online Controller Reset(OCR)
> >  : Enabled
> > [  104.550577] megaraid_sas 0000:45:00.0: Secure JBOD support   : Yes
> > [  104.550579] megaraid_sas 0000:45:00.0: NVMe passthru support : Yes [
> > 104.550581] megaraid_sas 0000:45:00.0: FW provided TM
> > TaskAbort/Reset timeout        : 6 secs/60 secs
> > [  104.550583] megaraid_sas 0000:45:00.0: JBOD sequence map support     :
> > Yes
> > [  104.550585] megaraid_sas 0000:45:00.0: PCI Lane Margining support    :
> > No
> > [  104.550999] megaraid_sas 0000:45:00.0: megasas_enable_intr_fusion is
> > called outbound_intr_mask:0x40000000
> >
> > Chris