linux-kernel - Re: [PATCH v3 2/2] interconnect: qcom: Add OSM L3 interconnect provider support

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Date:   Wed, 08 Jan 2020 01:01:39 +0530
From:   Sibi Sankar <sibis@...eaurora.org>
To:     Evan Green <evgreen@...omium.org>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Georgi Djakov <georgi.djakov@...aro.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Andy Gross <agross@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        Mark Rutland <mark.rutland@....com>,
        David Dai <daidavid1@...eaurora.org>,
        Saravana Kannan <saravanak@...gle.com>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        linux-kernel-owner@...r.kernel.org
Subject: Re: [PATCH v3 2/2] interconnect: qcom: Add OSM L3 interconnect
 provider support

On 2020-01-08 00:44, Evan Green wrote:
> On Mon, Dec 16, 2019 at 10:30 AM Sibi Sankar <sibis@...eaurora.org> 
> wrote:
>> 
>> Hey Evan,
>> 
>> On 12/7/19 12:46 AM, Evan Green wrote:
>> > On Wed, Nov 27, 2019 at 12:42 AM Sibi Sankar <sibis@...eaurora.org> wrote:
>> >>
>> >> Hey Evan/Georgi,
>> >>
>> >> https://git.linaro.org/people/georgi.djakov/linux.git/commit/?h=icc-dev&id=9197da7d06e88666d1588e3c21a743e60381264d
>> >>
>> >> With the "Redefine interconnect provider
>> >> DT nodes for SDM845" series, wouldn't it
>> >> make more sense to define the OSM_L3 icc
>> >> nodes in the sdm845.c icc driver and have
>> >> the common helpers in osm_l3 driver? Though
>> >> we don't plan on linking the OSM L3 nodes
>> >> to the other nodes on SDM845/SC7180, we
>> >> might have GPU needing to be linked to the
>> >> OSM L3 nodes on future SoCs. Let me know
>> >> how you want this done.
>> >>
>> >> Anyway I'll re-spin the series once the
>> >> SDM845 icc re-work gets re-posted.
>> >
>> > I don't have a clear picture of the proposal. You'd put the couple of
>> > extra defines in sdm845.c for the new nodes. But then you'd need to do
>> > something in icc_set() of sdm845. Is that when you'd call out to the
>> > osm_l3 driver?
>> 
>> with sdm845 icc rework "https://patchwork.kernel.org/cover/11293399/"
>> osm l3 icc provider needs to know the total number of rsc icc nodes,
>> i.e I can define the total number of rsc nodes and continue using the
>> same design as v3 since on sdm845/sc7180 gpu is not cache coherent.
>> 
>> or have the osm l3 table population logic and osm icc_set as helpers
>> and have it called from the sdm845/sc7180 icc driver so that we would
>> be able to link osm_l3 with rsc nodes on future qcom SoCs.
> 
> I see, so if we use the same design as v3, then the number of nodes is
> established at compile-time, and ends up being specific to sdm845. I'm
> fine with either approach, maybe leaning towards the hardcoded
> #defines you have now, and waiting to do the refactoring until you
> actually have two SoCs that can use this.
> -Evan

Thanks will stick to the #defines
for now.

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