From: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
To: Greg KH <gregkh@linuxfoundation.org>
Cc: hemantk@codeaurora.org, bbhatt@codeaurora.org,
linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org,
loic.poulain@linaro.org
Subject: Re: [PATCH 6/8] bus: mhi: core: Add support for processing priority of event ring
Date: Thu, 24 Jun 2021 20:20:06 +0530 [thread overview]
Message-ID: <20210624145006.GE6108@workstation> (raw)
In-Reply-To: <YNSZZhGSZ0lFgS+U@kroah.com>
On Thu, Jun 24, 2021 at 04:40:38PM +0200, Greg KH wrote:
> On Thu, Jun 24, 2021 at 07:54:53PM +0530, Manivannan Sadhasivam wrote:
> > On Thu, Jun 24, 2021 at 03:53:33PM +0200, Greg KH wrote:
> > > On Mon, Jun 21, 2021 at 09:46:14PM +0530, Manivannan Sadhasivam wrote:
> > > > From: Hemant Kumar <hemantk@codeaurora.org>
> > > >
> > > > Event ring priorities are currently set to 1 and are unused.
> > > > Default processing priority for event rings is set to regular
> > > > tasklet. Controllers can choose to use high priority tasklet
> > > > scheduling for certain event rings critical for processing such
> > > > as ones transporting control information if they wish to avoid
> > > > system scheduling delays for those packets. In order to support
> > > > these use cases, allow controllers to set event ring priority to
> > > > high.
> > > >
> > > > Signed-off-by: Hemant Kumar <hemantk@codeaurora.org>
> > > > Signed-off-by: Bhaumik Bhatt <bbhatt@codeaurora.org>
> > > > Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
> > > > Link: https://lore.kernel.org/r/1624053903-24653-2-git-send-email-bbhatt@codeaurora.org
> > > > Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
> > > > ---
> > > > drivers/bus/mhi/core/init.c | 3 +--
> > > > drivers/bus/mhi/core/main.c | 9 +++++++--
> > > > include/linux/mhi.h | 2 +-
> > > > 3 files changed, 9 insertions(+), 5 deletions(-)
> > > >
> > > > diff --git a/drivers/bus/mhi/core/init.c b/drivers/bus/mhi/core/init.c
> > > > index c81b377fca8f..444676034bf0 100644
> > > > --- a/drivers/bus/mhi/core/init.c
> > > > +++ b/drivers/bus/mhi/core/init.c
[...]
> > That's because, "1" was used from the beginning by the controller drivers
> > as the regular priority. And I thought of using "0" as high priority so
> > that we can leave the controller drivers unmodified.
>
> There's no problem modifying everyone, how much work is that?
>
I thought of minimizing the diff if we can avoid...err
> > > Shouldn't this be a boolean, or if not, an enumerated type so that
> > > people can read the code over time?
> > >
> >
> > Bhaumik proposed an enum but I wanted 0/1 so that the controller drivers
> > can be untouched. Also, I don't see any immediate requirement for other
> > priorities.
> >
> > Will make it a bool then.
>
> Rename it when you change it so that you know you catch all existing
> users.
>
Okay. Bhaumik, can you please use the enum (as you did)?
Thanks,
Mani
> thanks,
>
> greg k-h
next prev parent reply other threads:[~2021-06-24 14:50 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-21 16:16 [PATCH 0/8] MHI patches for v5.14 Manivannan Sadhasivam
2021-06-21 16:16 ` [PATCH 1/8] bus: mhi: core: Validate channel ID when processing command completions Manivannan Sadhasivam
2021-06-24 13:50 ` Greg KH
2021-06-24 14:32 ` Manivannan Sadhasivam
2021-06-24 14:39 ` Greg KH
2021-06-24 14:47 ` Manivannan Sadhasivam
2021-06-24 15:27 ` Greg KH
2021-06-24 15:56 ` Manivannan Sadhasivam
2021-06-21 16:16 ` [PATCH 2/8] bus: mhi: core: Fix power down latency Manivannan Sadhasivam
2021-06-21 16:16 ` [PATCH 3/8] bus: mhi: Wait for M2 state during system resume Manivannan Sadhasivam
2021-06-21 16:16 ` [PATCH 4/8] bus: mhi: Add inbound buffers allocation flag Manivannan Sadhasivam
2021-06-24 13:51 ` Greg KH
2021-06-24 15:39 ` Loic Poulain
2021-06-24 16:48 ` Greg KH
2021-06-24 19:01 ` Loic Poulain
2021-06-21 16:16 ` [PATCH 5/8] bus: mhi: pci-generic: Add missing 'pci_disable_pcie_error_reporting()' calls Manivannan Sadhasivam
2021-06-21 16:16 ` [PATCH 6/8] bus: mhi: core: Add support for processing priority of event ring Manivannan Sadhasivam
2021-06-24 13:53 ` Greg KH
2021-06-24 14:24 ` Manivannan Sadhasivam
2021-06-24 14:40 ` Greg KH
2021-06-24 14:50 ` Manivannan Sadhasivam [this message]
2021-06-21 16:16 ` [PATCH 7/8] bus: mhi: pci_generic: Apply no-op for wake using sideband wake boolean Manivannan Sadhasivam
2021-06-24 13:54 ` Greg KH
2021-06-21 16:16 ` [PATCH 8/8] bus: mhi: pci_generic: Add Cinterion MV31-W PCIe to MHI Manivannan Sadhasivam
2021-06-24 13:54 ` Greg KH
2021-06-24 13:54 ` [PATCH 0/8] MHI patches for v5.14 Greg KH
2021-06-24 14:20 ` Manivannan Sadhasivam
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