Date:   Thu, 30 Mar 2017 15:28:20 +0100
From:   Lorenzo Pieralisi <lorenzo.pieralisi@....com>
To:     Wei Xu <xuwei5@...ilicon.com>
Cc:     Hanjun Guo <hanjun.guo@...aro.org>,
        Marc Zyngier <marc.zyngier@....com>,
        Hanjun Guo <guohanjun@...wei.com>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        linux-acpi@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
        Greg KH <gregkh@...uxfoundation.org>,
        Tomasz Nowicki <tn@...ihalf.com>, Ma Jun <majun258@...wei.com>,
        Kefeng Wang <wangkefeng.wang@...wei.com>,
        Sinan Kaya <okaya@...eaurora.org>, huxinwei@...wei.com,
        yimin@...wei.com, linuxarm@...wei.com, majun258@...iwei.com
Subject: Re: [PATCH v9 10/15] ACPI: platform-msi: retrieve dev id from IORT

On Thu, Mar 30, 2017 at 09:32:57AM +0100, Wei Xu wrote:
> Hi All,
> 
> On 2017/3/30 4:07, Hanjun Guo wrote:
> > On 03/30/2017 01:32 AM, Lorenzo Pieralisi wrote:
> >> On Wed, Mar 29, 2017 at 05:13:54PM +0100, Lorenzo Pieralisi wrote:
> >>> On Wed, Mar 29, 2017 at 03:52:47PM +0100, Marc Zyngier wrote:
> >>>> On 29/03/17 14:00, Hanjun Guo wrote:
> >>>>> On 03/29/2017 08:38 PM, Lorenzo Pieralisi wrote:
> >>>>>> On Wed, Mar 29, 2017 at 07:52:48PM +0800, Hanjun Guo wrote:
> >>>>>>> Hi Lorenzo,
> >>>>>>>
> >>>>>>> On 03/29/2017 06:14 PM, Lorenzo Pieralisi wrote:
> >>>>>>>> Hi Hanjun, Marc,
> >>>>>>>>
> >>>>>>>> On Tue, Mar 07, 2017 at 08:40:05PM +0800, Hanjun Guo wrote:
> > [...]
> >>>>>>>>>    drivers/acpi/arm64/iort.c                     | 24 ++++++++++++++++++++++++
> >>>>>>>>>    drivers/irqchip/irq-gic-v3-its-platform-msi.c |  3 ++-
> >>>>>>>>>    include/linux/acpi_iort.h                     |  5 +++++
> >>>>>>>>>    3 files changed, 31 insertions(+), 1 deletion(-)
> >>>>>>>>
> >>>>>>>> To simplify merging ACPI/IRQCHIP changes via different trees it
> >>>>>>>> would be good to split this patch; I am not sure what's the best
> >>>>>>>> way of handling it though given that we would end up in a merge
> >>>>>>>> ordering dependency anyway (ie we can create an empty stub
> >>>>>>>> for iort_pmsi_get_dev_id() but that would create a dependency
> >>>>>>>> between ARM64 and irqchip trees anyway).
> >>>>>>>
> >>>>>>> The first 12 patches for ACPI platform MSI and later 3 patches
> >>>>>>> for mbigen have no "physical" dependency, which means they can
> >>>>>>> be merged and compiled independently, they only have functional
> >>>>>>> dependency only.
> >>>>>>>
> >>>>>>> We already had SAS, XGE, USB and even UART drivers depend on
> >>>>>>> the mbigen ACPI support, so I don't think the dependency of ACPI
> >>>>>>> platform MSI and mbigen patches cares much if those two parts are
> >>>>>>> merged in one merge window, even they are merged independently via
> >>>>>>> different tree.
> >>>>>>>
> >>>>>>>>
> >>>>>>>> Please let me know what's your preferred way of handling this.
> >>>>>>>
> >>>>>>> So in my opinion, they can be merged independently via ARM64 and
> >>>>>>> irqchip tree with no ordering dependency, is it OK?
> >>>>>>
> >>>>>> I am speaking about merging MBIgen AND ITS patches via IRQCHIP and
> >>>>>> ACPI/IORT for ARM64, that's why I replied to this patch. I do not
> >>>>>> think that's feasible to split patches in two separate branches
> >>>>>> without having a dependency between them.
> >>>>>>
> >>>>>> Sure, the last three patches can go via IRQCHIP but that was not
> >>>>>> my question :)
> >>>>>
> >>>>> Sorry, I misunderstood that :(
> >>>>>
> >>>>> Since it's not feasible to split patches, the best way I got is that
> >>>>> we get Marc's ack then merge it.
> >>>>
> >>>> I believe there is a way to make this work without too much hassle. I
> >>>> suggest we drop the ITS change from this patch entirely, and I instead
> >>>> queue this patch:
> >>>>
> >>>> https://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-platforms.git/commit/?h=irq/irqchip-4.12&id=e6db07d0f3b6da1f8cfd485776bfefa4fcdbfc45
> >>>>
> >>>> That way, no dependency between the two trees. Lorenzo takes all the
> >>>> patches flagged "ACPI", I take all those flagged "irqchip" or "msi", and
> >>>> everything should be perfectly standalone.
> >>>>
> >>>> Thoughts?
> >>>
> >>> Perfect for me. Hanjun, I can cherry pick Marc's patch above, rework
> >>> this patch and post the resulting branch for everyone to have a final
> >>> test.
> >>
> >> git://git.kernel.org/pub/scm/linux/kernel/git/lpieralisi/linux.git acpi/arm64-acpi-4.12
> >>
> >> Please have a look and let me know if that's ok, I planned to send
> >> a PR to Catalin by the end of the week (first 7 patches up to
> >> 7fc3061df075 ("ACPI: platform: setup MSI domain for ACPI based platform
> >> device")).
> > 
> > Perfect for me too, Lorenzo, Marc, Thank you very much.
> > 
> > I'm currently in paternity leave and can't reach the machine,
> > I had a detail review with the patches, they looks good to me,
> > Ma Jun and Wei Xu will test on Hisilicon machines and give the
> > feedback.
> 
> Thanks to all of you!
> Tested on D05 board with this branch, the SAS disks and XGE port are working fine.

Ma Jun and Wei Xu, I pushed out a signed tag in preparation for a pull
request to Catalin tomorrow, please carry out last few checks before
I send it:

git://git.kernel.org/pub/scm/linux/kernel/git/lpieralisi/linux.git tags/acpi-arm64-for-v4.12

You should try to merge it with Marc's branch:

git://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-platforms.git irq/irqchip-4.12

and test the resulting branch, that's how they will go upstream.

Please let me know, thank you for your help !

Lorenzo

> The log is as below:
> 
> 	estuary:/$ dmesg
> 	[    0.000000] Booting Linux on physical CPU 0x10000
> 	[    0.000000] Linux version 4.11.0-rc3-14418-gea60d0a (xuwei@...BuildSvr1) (gcc version 4.9.2 20140904 (prerelease) (crosstool-NG linaro-1.13.1-4.9-2014.09 - Linaro GCC 4.9-2014.09) ) #28 SMP PREEMPT Thu Mar 30 16:15:42 CST 2017
> 	[    0.000000] Boot CPU: AArch64 Processor [410fd082]
> 	[    0.000000] efi: Getting EFI parameters from FDT:
> 	[    0.000000] efi: EFI v2.60 by EDK II
> 	[    0.000000] efi:  SMBIOS=0x3f040000  SMBIOS 3.0=0x39af0000 ACPI=0x39bc0000  ACPI 2.0=0x39bc0014  MEMATTR=0x3ccb0098
> 	[    0.000000] cma: Reserved 16 MiB at 0x000000003e000000
> 
> 
> 	estuary:/$ ping 192.168.1.107
> 	PING 192.168.1.107 (192.168.1.107): 56 data bytes
> 	64 bytes from 192.168.1.107: seq=0 ttl=64 time=0.273 ms
> 	64 bytes from 192.168.1.107: seq=1 ttl=64 time=0.102 ms
> 	64 bytes from 192.168.1.107: seq=2 ttl=64 time=0.103 ms
> 	64 bytes from 192.168.1.107: seq=3 ttl=64 time=0.098 ms
> 	^C
> 	--- 192.168.1.107 ping statistics ---
> 	4 packets transmitted, 4 packets received, 0% packet loss
> 	round-trip min/avg/max = 0.098/0.144/0.273 ms
> 
> 	estuary:/$ lspci -mk
> 	30:00.0 "Class 0604" "19e5" "1610" "0000" "0000" "pcieport"
> 	91:00.0 "Class 0300" "19e5" "1711" "0000" "0000"
> 	90:00.0 "Class 0604" "19e5" "1610" "0000" "0000" "pcieport"
> 	20:00.0 "Class 0604" "19e5" "1610" "0000" "0000" "pcieport"
> 	10:00.0 "Class 0604" "19e5" "1610" "0000" "0000" "pcieport"
> 	80:00.0 "Class 0604" "19e5" "1610" "0000" "0000" "pcieport"
> 	00:00.0 "Class 0604" "19e5" "1610" "0000" "0000" "pcieport"
> 	c0:00.0 "Class 0604" "19e5" "1610" "0000" "0000" "pcieport"
> 	88:00.0 "Class 0604" "19e5" "1610" "0000" "0000" "pcieport"
> 	
> 	estuary:/$ cat /dev/sd
> 	sda   sdb   sdc   sdd   sde   sdf   sdg   sdh   sdi   sdj   sdk sdl
> 	sda1  sdb1  sdc1  sdd1  sde1  sdf1  sdg1  sdh1  sdi1  sdj1  sdk1 sdl1
> 
> Best Regards,
> Wei
> 
> > 
> > Thanks
> > Hanjun
> > 
> > .
> > 
> 

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