[PATCH v3 0/8] ARM: NOMMU: MPU updates

[Vladimir Murzin]

On 13/10/17 10:24, Russell King - ARM Linux wrote:
> Sorry, but I have no working MPS3 platform since it killed its uSD card
> with all the FPGA bitstreams on.  I'm waiting (since end of September)
> for a replacement from ARM Ltd but there hasn't yet been any progress.
> 
> Sure, I can replace the uSD card myself, but the problem is the contents
> of the card.

Thanks for prompt reply!

I should say that board won't help you with testing this series since it
implements different MPU model (I have patches for that too but they are
on top of this series).

I've been working closely with Alex and András (since they needed this for
their Cortex-M7 platform) to make sure it works as expected. It was also
tested with R-class FastModels.

I intentionally kept CONFIG_ARM_MPU disabled by default for M-class
(PATCH 6/8), so it won't interfere with existing bootloaders.

I'd be glad if you can review the series and give it a chance to sit in
linux-next (I can provide a branch on top of yours for-next).

Cheers
Vladimir


> 
> On Fri, Oct 13, 2017 at 10:17:00AM +0100, Vladimir Murzin wrote:
>> Gentle ping...
>>
>> On 09/10/17 10:20, Vladimir Murzin wrote:
>>> Russell, do you have concerns on this series?
>>>
>>> Thanks
>>> Vladimir
>>>
>>> On 25/09/17 10:05, Vladimir Murzin wrote:
>>>> Hi,
>>>>
>>>> This is an update of the existent MPU code which consist set of
>>>> clean-ups and enhancements. The most significant changes are in the
>>>> way how MPU settings sync-up for secondaries (PATCH 3/8), more
>>>> flexible layout for memory (PATCH 7/8) and support for XIP (PATCH
>>>> 8/8). Since there is no in-tree user of MPU, support for M-class has
>>>> been added (PATCH 6/8).
>>>>
>>>> There is also practical benefit of patch set:
>>>>
>>>> "These MPU patches introduce a nice feature that it simplifies the
>>>> bootloader: do not need to setup the MPU, for example for coherent DMA
>>>> region, which is described in device-tree too." András Szemző
>>>>
>>>> Changelog:
>>>>            v2 -> v3
>>>>               - fixed support for XIP (PATCH 8/8)
>>>> 	      - rebased on 4.14-rc2
>>>>
>>>>            v1 -> v2
>>>>               - support for XIP (PATCH 8/8)
>>>> 	      - rebased on 4.13-rc1
>>>>
>>>>         RFC v2 -> v1
>>>>                - dropped RFC tag
>>>> 	       - Tested-by from András
>>>> 	       - rebased on 4.12-rc5
>>>>
>>>>            RFC -> RFC v2
>>>> 	       - fixed MPU enable for v7m (PATCH 6/7)
>>>>
>>>> Thanks!
>>>>
>>>> Vladimir Murzin (8):
>>>>   ARM: NOMMU: Move out MPU setup in separate module
>>>>   ARM: NOMMU: Update MPU accessors to use cp15 helpers
>>>>   ARM: NOMMU: Rework MPU to be mostly done in C
>>>>   ARM: NOMMU: Disallow MPU for XIP
>>>>   ARM: Kconfig: Kill CONFIG_VECTORS_BASE
>>>>   ARM: V7M: Add support for MPU to M-class
>>>>   ARM: NOMMU: Use more MPU regions to cover memory
>>>>   ARM: NOMMU: Support MPU in XIP configuration
>>>>
>>>>  arch/arm/Kconfig                  |   9 -
>>>>  arch/arm/Kconfig-nommu            |   4 +-
>>>>  arch/arm/include/asm/cputype.h    |  10 +
>>>>  arch/arm/include/asm/mpu.h        |  26 +-
>>>>  arch/arm/include/asm/smp.h        |   2 +-
>>>>  arch/arm/include/asm/v7m.h        |  10 +
>>>>  arch/arm/kernel/asm-offsets.c     |  11 +
>>>>  arch/arm/kernel/head-nommu.S      | 148 +++++++++---
>>>>  arch/arm/kernel/smp.c             |   2 +-
>>>>  arch/arm/kernel/vmlinux-xip.lds.S |  23 ++
>>>>  arch/arm/mm/Makefile              |   1 +
>>>>  arch/arm/mm/nommu.c               | 254 +-------------------
>>>>  arch/arm/mm/pmsa-v7.c             | 484 ++++++++++++++++++++++++++++++++++++++
>>>>  13 files changed, 682 insertions(+), 302 deletions(-)
>>>>  create mode 100644 arch/arm/mm/pmsa-v7.c
>>>>
>>>
>>>
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>>>
>>
>