path: root/wiki/Chat_log/20160510-core-chatlog

Core-chat-meeting-2016-05-10

10:07 < geertu> Agenda:
10:07 < geertu> 1. Upcoming Gen3 development for the Core group,
10:07 < geertu> 2. Increasing the size of GIC-400 mapped registers
10:07 < geertu> 3. Face-2-face meeting during LinuxCon Japan
10:07 < geertu> 4. Status check for tasks from last meeting - what is remaining?
10:08 < geertu> Topic 1. Upcoming Gen3 development for the Core group
10:08 < geertu> I've posted patches for initial CPG/MSSR support and SYSC PM Domains for r8a7796
10:08 < geertu> Runs fine on M3-W.
10:09 < geertu> And on H3 ES1.1, FWIW
10:09 < horms> Thanks. I plan to use them as the base for my basic M3-W support. Unfortunately the patches I have put together don't seem to give me a console yet.
10:09 < horms> How did you test the cpg/mssr patch set?
10:09 < geertu> horms: Did you try my topic/gen3-latest branch?
10:09 < horms> No
10:10 < geertu> I have a single patch there that adds the glue to make it work.
10:10 < horms> supurb. thanks!
10:10 < horms> one last question. does earlycon work out of the box or does it need to be enabled somehow?
10:11 < geertu> I assume you can cook basic M3-W patches by extracting pieces from that.
10:11 < geertu> You have to add "earlycon" on the kernel command line
10:11 < horms> ok, thanks. got it
10:11 < geertu> And unfortunately it's not that early as DEBUG_LL on arm32.
10:12 < geertu> Unfortunately we don't have anything better on arm64.
10:12 < horms> i suspected as much (x2~
10:12 < horms> i'll compare your glue patch to what I have and see what i did wrong
10:12 < geertu> From my first experience with M3-W, things are working smoothly. PSCI is even able to reboot ;-)
10:13 < horms> I guess the hw design is a bit more mature than when we first got H3
10:13 < geertu> That is without PFC, which may cause us (Uli?) some headaches due to the bus access issue.
10:13 < horms> I was hoping to include PFC support. But probably its best to do that as a second step.
10:14 < geertu> Yeah, I can't send out the HSCIF r8a7796 binding update without PFC and without local access.
10:16 < geertu> I was also happy to see H3ES1.1 works fine with my normal H3 kernel.
10:16 < horms> I got a message from dammsan. He had another appointment which is now finished. He should be here soon.
10:17 -!- dammsan [~dammsan@s214090.ppp.asahi-net.or.jp] has joined #periperi
10:17 < horms> voila!
10:17 < geertu> Welcome dammsan
10:17 < dammsan> thanks, sorry about the delay.
10:18 < geertu> We've just discussed the noise in your house ;-)
10:18 < dammsan> also, sorry for trouble with the remote access - the cat shut down my house
10:18 < dammsan> but it is up and running now again
10:18 < geertu> You use the cat for remote access (flipping switches and pressing buttons)? Cool!
10:19 < morimoto> Ohh loo-chan !
10:19 < dammsan> it manages things by itself somehow =)
10:20 < dammsan> 20 vms got powered off =)
10:20 < geertu> Oops. that includes the locally installed tftp servers?
10:20 < dammsan> geertu: so your local tftp setup is probably gone
10:20 < dammsan> yeah - sorry!!
10:20 < dammsan> i restarted but lost state
10:20 < geertu> NP, time to automate the install from my side
10:21 < dammsan> thanks for covering
10:22 < geertu> Any other upcoming Gen3 development for the Core group?
10:23 < dammsan> i guess PFC paper work for ulrich needs to be finalised
10:24 < dammsan> apart from that nothing from my side
10:24 < neg> I would like to do something for the core group within the next month or so :-)
10:24 < uli___> dammsan: from my side, there is no rush, i'll soon be gone, back on the 23rd
10:25 < geertu> neg: DMA?
10:25 < dammsan> uli___: ok, thanks for letting me know. we should finalise all your tasks rather soon then to wrap up 6/E tasks
10:25 < horms> dammsan: uli___: what is the nature of the pfc work?
10:26 < neg> geertu: I sent out refreshed IPMMU+DMAC patches yesterday so I have no task in the pipeline to work on
10:26 < dammsan> uli___: can you talk to the group leaders and decide how to split your remaining time between the groups?
10:26 < uli___> horms: r8a7795 bias support and minimal r8a7796 support
10:26 < uli___> dammsan: i have two core and one multimedia task, so i'm left with one slot
10:27 < uli___> which is supposed to be i/o, i guess
10:27 < horms> uli___: thanks. i will skip doing pfc as part of my basic r8a7796 support
10:29 < dammsan> uli___: can you send an email to me and the group leaders with a list of the additional tasks you have signed for and what is planned as well as what is left?
10:29 < uli___> ok
10:30 < dammsan> thanks
10:30 < dammsan> geertu: do you feel satisfied with the amount of additional slots you got for the core group?
10:30 < geertu> ;-)
10:31 < dammsan> geertu: or would you like to try to steal some time if something is urgent? =)
10:31 < horms> fwiw, i think i have one free slot
10:31 < dammsan> in my mind core group assignment is more or less done (with the exception of uli)
10:31 < dammsan> so the remainer of the slots go to i/o and multimedia
10:32 < dammsan> but we can adjust depending on the need
10:32 < dammsan> horms: i think you have more than one slot left
10:33 < horms> ok, lets talk about that some time
10:33 < dammsan> sure
10:36 < khiemnguyen> up up
10:37 < geertu> Topic 2. Increasing the size of GIC-400 mapped registers
10:37 < geertu> I had a look at the actual register contents earlier this morning
10:37 < geertu> and increasing region 1 and 3 to 128 KiB doesn't make much sense to me (64 KiB is OK).
10:38 < geertu> Region 0 is 1 4 KiB page (16 times aliased in the full 64 KiB block)
10:38 < pinchartl> geertu: didn't Marc explain that the register block is aliased multiple times over a 128kB region ?
10:38 < horms> yes
10:38 < geertu> pinchartl: That's true for region 2
10:38 < dammsan> geertu: shouldn't xen do whatever magic is needed to make it fit?
10:38 < dammsan> and we are just describing the hardware in DT?
10:39 < horms> dammsan: that is my basic feeling too
10:39 < horms> but it seems that Mark Zyngnier has taken the kernel implementation in a different direction
10:39 < geertu> Region 1 is currently 2 identical 4 KiB pages
10:39 < geertu> Dirk wants to expand it to 128 KiB.
10:40 < geertu> However, the first 64 KiB is just 16 aliases of the first (and second) 4 KiB page
10:40 < geertu> While the second 64 KiB is all zeroes
10:40 < geertu> Region 2 is already 128 KiB, which makes sense, as it's 16 aliased pages + 16 different aliased pages
10:41 < geertu> For region 3, the other one Dirk wants to increase, the situatin is identical to region 1
10:42 < dammsan> geertu: i recall the gic behaving differently depending on if secure mode is used or not
10:42 < dammsan> there is some bit that can be used to determine which mode is used
10:42 < dammsan> (at least in some version of the gic)
10:42 < horms> It seems to me that at some level ARM decided that this aliasing approach is the solution to allowing hypervisors with 64Kb pages to trap the areas in question
10:42 < geertu> So region 1 and region 2 have 2 all-zero blocks due to non-secure mode?
10:43 < dammsan> geertu: not sure, but it could be so
10:43 < dammsan> feel free to try to convince me to install the old secure mode environment
10:44 < geertu> Then 128 KiB for region 1 and 3 make sense.
10:44 < geertu> And the question is more like why we had 8 KiB there before (copied from Gen2?)
10:45 < geertu> I'll respond to the email thread
10:45 < dammsan> i think it is possible to use the SCIF download mode and enter via JTAG to access secure mode
10:45 < horms> Presumably it was copied either from Gen2 or from the BSP (which may be the same thing)
10:45 < geertu> But if the patch was OK in the first place, why didn't Marc just provide his Acked-by?
10:45 < horms> I think Mark came into the thread pretty lated
10:45 < horms> and the patch itself had disappeared from view by then
10:46 < horms> s/lated/late/
10:46 < geertu> I checked, and it was still quoted
10:46 < dammsan> so may i ask, the base addresses remain unchanged
10:46 < dammsan> this is just about the size?
10:46 < horms> yes
10:46 < dammsan> ok thanks
10:46 < geertu> dammsan: The driver will adjust the size
10:46 < geertu> dammsan: The driver will adjust the base address
10:47 < dammsan> that would make sense
10:47 < horms> I don't think it would be unreasonable to ask Mark for an Ack. It does seem to be an area he is knoledgable about
10:47 < geertu> The driver needs 2 contiguous 4 KiB blocks
10:47 < geertu> So if 2 64 KiB blocks are given, it uses register base = block base + 60 KiB
10:47 < dammsan> but it could be optimized with 64 KiB blocks
10:48 < geertu> optimized?
10:48 < dammsan> fewer entries in the TLB?
10:48 < geertu> The idea is that the 2 4 KiB register blocks are in different pages
10:48 < geertu> so they can have different protection
10:48 < dammsan> ok ok gotcha, cpu interface and distributor
10:48 < dammsan> never mind me
10:49 < dammsan> makes sense
10:49 < horms> geertu: can you talk to dirk/mark a bit about this? basically I feel it is ok to apply the patch. but I'd rather not live to regret it.
10:50 < geertu> horms: yes, that's what I said I will do
10:50 < horms> excellent, thanks!
10:50 < geertu> Topic 3. Face-2-face meeting during LinuxCon Japan
10:52 < morimoto> Now I'm collecting topics from Renesas member
10:52 < morimoto> Oops, sorry it is for RenesasCon
10:54 < morimoto> I think we can have Mini-PeriCon on 11th, and RenesasCon 12th
10:54 < geertu> I think the topic is about all meetings during that week
10:56 < morimoto> I  wounder does Ulich come to Japan ?
10:57 < horms> uli___: ↑
10:57 < uli___> no, i won't :(
10:58 < morimoto> OK
10:59 < morimoto> I will post collected Renesas side topic to PeriPeriML
10:59 < geertu> OK
11:00 < morimoto> Your side would like to know R-Car business, and each member/group
11:00 < morimoto> is this correct ?
11:01 < geertu> I think so
11:01 < neg> At least I would like that
11:01 < khiemnguyen> Where will we have the meeting ?
11:01 < morimoto> About RenesasCon, I'm planing on Renesas office
11:02 < morimoto> but the conference room is not yet decided
11:02 < pinchartl> on what day would that be ?
11:02 < morimoto> RenesasCon = 12th
11:02 < horms> morimoto: that would be the Musashi-works near Kokubunji?
11:02 < morimoto> Yes
11:03 < horms> Got it
11:03 < morimoto> Because Renesas member will join
11:03 < pinchartl> ok
11:03 < morimoto> We can have different place for MiniPeriCon (?)
11:04 < morimoto> Then, we (= Renesas) would like to know your side current tasks/issue/headache
11:04 < horms> I mainly ask because althouth I know where it is other may not. Its a bit of a distance from e.g. where LinuxCon is being held. They probably need to plan for that.
11:04 < morimoto> Please create something of presentation :)
11:05 < khiemnguyen> each group leader will make presentation ?
11:05 < morimoto> horms: Yes, it is my headache too
11:05 < geertu> It's about one hour from LinuxCon?
11:06 < horms> I am happy to help people find the venue :)
11:06 < horms> geertu: perhaps a little more.
11:07 < horms> google says about an hour, you were right
11:08  * geertu used Google
11:08 < horms> :)
11:08 < neg> have anyone booked hotell? My knowledge about Toky is nil and I don't want to live on the wrong side of the tracks :-)
11:09 < horms> google can help you :)
11:09 < morimoto> Or I can :)
11:09 < morimoto> dammsan: do you have any plan for MiniPeriCon room ?
11:10 < pinchartl> neg: I've booked at the conference hotel
11:10 < horms> morimoto: (off topic) do you know if the BSP meeting on friday is still on?
11:10 < neg> horms: I tried google for Brussels and ended up in a hotel where they probobly are used to charge you by the hour
11:11 < morimoto> horms: for this week 13th? then yes, still ON
11:11 < horms> haha. i can help too
11:11 < horms> morimoto: 了解です
11:11 < dammsan> morimoto: no plan, the library actually just called me and said I owed the the double about of money due to a no-show meeting room =)
11:12 < geertu> pinchartl: it seems to be fully booked  by now
11:13 < geertu> neg: Good for you! Usually people don't stay an integer number of 24h-days
11:14 < neg> geertu: :-)
11:15 < horms> fwiw, i usually stay either at the monteray n
11:15 < horms> hanzomon or somewhere in kudanshita for linuxcon
11:15 < horms> partly because that is in between linuxcon and the old renesas office
11:15 < horms> and i'm not affraid of the subway system :)
11:16 < dammsan> i recommend the "la festa kichijouji" hotel for everyone =)
11:17 < morimoto> closed to your home
11:18 < dammsan> you can probably both rest and stay if you want
11:18 < geertu> Doesn't look like it's close to LinuxCon?
11:18 < horms> its close to renesas :)
11:18 < dammsan> its not, i'm not serious
11:19 < horms> Somewhere on the Tozai line might be a good choice. As that can be used to get both to LinuxCon and part way to Renesas
11:19 < geertu> Be careful with such jokes, or we'll all end up in little tubes near Fukushima ;-)
11:19 < dammsan> =)
11:19 < horms> Or Idabashi which is within walking distance of LinuxCon and should connect to the Sobu/Chuo line to head out to Renesas
11:20 < geertu> Idabashi is not a hotel?
11:20 < horms> its an area
11:21 < horms> presumably there are hotels there
11:21 < geertu> horms: OK, I'll ask neg to find a good one over there ;-)
11:21 < horms> i'm unsure if my family will join me or not
11:21 < horms> so i will be holding off on a booking for now
11:22 < neg> geertu: I will find a nice one, how many hours do you need :-)
11:23 < horms> Probably geertu only needs a rest every second day
11:24 < geertu> Topic 4. Status check for tasks from last meeting - what is remaining?
11:25 < geertu> r8a7796 CPG/MSSR and SYSC is public
11:25 < neg> I have pinged Arnd in the thread for the multiple DT DMACs but no reply so far, plan to wait a few more days and ping again
11:26 < geertu> r8a7795 drive-strength support is merged
11:26 < khiemnguyen> I sent out CPUfreq patches. Need feedback. :)
11:26 < geertu> PFC 1.8v switching (for r8a7790) is merged
11:26 < geertu> R-Car SYSC PM Domain support is merged
11:27 < geertu> khiemnguyen: I've sent some feedback
11:27 < horms> geertu: it looks like the above item made it into arm-soc smoothly :)
11:28 < horms> neg: how is the effort to use more than one dma controller going. I'm referring to the patches Olof took exception to
11:29 < neg> horms: as we talked about during last meeting I would try to get Arnds feedback on the same patches but I have failed to get his attention
11:30 < horms> ok
11:30 < pinchartl> I have to go I'm afraid
11:30 < horms> bye
11:30 < morimoto> pinchartl: quick request
11:31 < morimoto> pinchartl: Kurokawa-san is waiting your resonse
11:31 < morimoto> s/resonse/response/
11:31 < dammsan> morimoto: lets discuss this f2f tomororw
11:31 < morimoto> OK
11:32 < pinchartl> morimoto: I'll reply this afternoon
11:32 < pinchartl> I was away last week
11:32 < morimoto> Thanks
11:32 < pinchartl> and catching up with my e-mails
11:33 < pinchartl> have a nice afternoon/evening
11:34 -!- khiemnguyen [d2a0fca8@gateway/web/cgi-irc/kiwiirc.com/ip.210.160.252.168] has quit [Quit: http://www.kiwiirc.com/ - A hand crafted IRC client]
11:34 -!- khiemnguyen [d2a0fca8@gateway/web/cgi-irc/kiwiirc.com/ip.210.160.252.168] has joined #periperi
11:35 < geertu> I think all topics have been covered.
11:35 < geertu> Or did I miss anything?
11:35 < geertu> pinchartl: Bye!
11:35 < dammsan> geertu: thanks for your help
11:36 < horms> nothing from my side
11:36 < geertu> pinchartl: What happened to git.linuxtv.org? (for todays renesas-drivers)?
11:37 < geertu> OK, thanks for joining, and have a nice day/evening/morning!