Re: [PATCH v4 0/8] perf: arm: Make PMUv3 driver available for aarch32

On Fri, Mar 24, 2023 at 01:56:42PM +0000, Mark Rutland wrote:

On Sat, Mar 18, 2023 at 10:02:33AM +0000, Marc Zyngier wrote:

quoted

On Fri, 17 Mar 2023 19:50:19 +0000,
Zaid Al-Bassam [off-list ref] wrote:

quoted

Currently, PMUv3 driver is only available for ARMv8 aarch64 platforms,
ARMv8 platorms running in aarch32 mode dont have access to the driver.
This is, especially, a problem for ARMv8 platforms that only have
aarch32 support, like the Cortex-A32.

Make the PMUv3 driver available to arm arch (ARMv8 aarch32) by moving
the PMUv3 driver from arm64 to drivers, that makes the driver common
to both arm and arm64 architectures, then add PMUv3 arm Support.

The main work in this patchset was made a while back by Marc Zyngier
in [1]. Patchset version 1 [v1] rebases Marc's patches to the latest
kernel revision and adds additional patches to accommodate the changes
in the kernel since Marc wrote the patches.

version 2 [v2] of the patchset was created by Marc Zyngier and I
picked it up from [2].

The SoB chain is now a bit off as you picked it from my tree. Nothing
that we can't fix, but please be careful in the future. You also
failed to pick Florian's Tested-by: tags, which is worse. Please make
sure to pick these things as people reply to your series.

Will, Mark: any objection to the general shape of this series? I've
been using it again to test the 32bit PMU support in KVM, and would
rather see something merged while the architecture still has some
relevance.

I think the general shape looks fine, but this is going to conflict with
Anshuman's BRBE series, so we'll need to figure out how to stage these w.r.t.
one another.

Will, any preference between handling the merge manually or rebasing one atop
the other? We'll presumably want to place the BRBE files under drivers/perf/ if
we've moved the PMUv3 code there.

Probably easiest to queue this and have Anshuman rebase BRBE on top once
I've done that. I'll look at it next week.

Will

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