linux-kernel - Re: [PATCH v2 00/10] irqdomain, gic-v3-its: Implement late irq domain initialization

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Date:   Wed, 5 Dec 2018 12:50:14 +0000
From:   "Richter, Robert" <Robert.Richter@...ium.com>
To:     Marc Zyngier <marc.zyngier@....com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Jason Cooper <jason@...edaemon.net>
CC:     "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Stuart Yoder <stuyoder@...il.com>,
        Laurentiu Tudor <laurentiu.tudor@....com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Will Deacon <will.deacon@....com>,
        Lorenzo Pieralisi <Lorenzo.Pieralisi@....com>,
        Julien Thierry <julien.thierry@....com>
Subject: Re: [PATCH v2 00/10] irqdomain, gic-v3-its: Implement late irq domain
 initialization

Marc,

do you have any comments on this series? Please take a look at it.

There is also this one on top:

 https://patchwork.kernel.org/cover/10685025/

Both series fix ITS table allocation for 4k page size and make the
upstream kernel working without the need of additional patches.

Thanks,

-Robert


On 28.11.18 15:43:02, Richter, Robert wrote:
> This patch series is a rework of the gic-v3-its initialization. It is
> in preparation of a further series that uses CMA memory allocation for
> ITS tables. For this the CMA framework must be available and thus ITS
> needs to be initialized after the arch_initcalls. This requires two
> major reworks.
> 
> First we must remove all irq domain init order dependencies (patches
> #1-#5), second the ITS initialization must be split into an early
> probe and a later init part (patches #6-#10).
> 
> Patch #1 introduces a new interface to request an irq domain, see the
> patch description for details. In patches #2-#5 all ITS related irq
> domains are converted to use the new interface. There are no order
> dependencies for parent and client irq domain initialization anymore
> which allows us to initialize all ITS irq domains in the same initcall
> (moving to the later subsys_initcall). Note that I do not have fsl
> hardware available, the code should work, but is only carefully
> reviewed and compile tested, please test on that hardware.
> 
> The remaining patches #6-#10 are an incremental rework of the ITS
> initialization, basically splitting probe and init (patch #7) and
> separating it from gic-v3 code (patch #8). Patches #9 and #10 change
> initcall levels for various drivers.
> 
> Patches have been tested with Cavium ThunderX and ThunderX2. I have an
> implementation of CMA ITS table allocation on top of this series
> available, I will send out patches for this in a couple of days.
> 
> v2:
>  * fix check for domain match in irq_domain_handle_requests()
>  * add comment that describes this check in irq_domain_handle_
>    requests()
> 
> Robert Richter (10):
>   irqdomain: Add interface to request an irq domain
>   irqchip/gic-v3-its-platform-msi: Remove domain init order dependencies
>   irqchip/irq-gic-v3-its-pci-msi: Remove domain init order dependencies
>   irqchip/irq-gic-v3-its-fsl-mc-msi: Remove domain init order
>     dependencies
>   fsl-mc/dprc-driver: Remove domain init order dependencies
>   irqchip/gic-v3-its: Initialize its nodes in probe order
>   irqchip/gic-v3-its: Split probing from its node initialization
>   irqchip/gic-v3-its: Decouple its initialization from gic
>   irqchip/gic-v3-its: Initialize its nodes later
>   irqchip/gic-v3-its: Initialize MSIs with subsys_initcalls
> 
>  drivers/bus/fsl-mc/dprc-driver.c              |  41 +++++++
>  drivers/bus/fsl-mc/fsl-mc-msi.c               |   6 +-
>  drivers/irqchip/irq-gic-v3-its-fsl-mc-msi.c   |  49 +++++---
>  drivers/irqchip/irq-gic-v3-its-pci-msi.c      |  68 ++++++-----
>  drivers/irqchip/irq-gic-v3-its-platform-msi.c |  56 +++++++--
>  drivers/irqchip/irq-gic-v3-its.c              | 160 ++++++++++++++++---------
>  drivers/irqchip/irq-gic-v3.c                  |  12 +-
>  include/linux/cpuhotplug.h                    |   1 +
>  include/linux/irqchip/arm-gic-v3.h            |   5 +-
>  include/linux/irqdomain.h                     |  15 +++
>  kernel/irq/irqdomain.c                        | 163 ++++++++++++++++++++++++++
>  11 files changed, 446 insertions(+), 130 deletions(-)
> 
> -- 
> 2.11.0
>