[PATCH v4 2/2] cache: add SMCCC-backed cache invalidate provider

[Jonathan Cameron]

On Tue, 13 Oct 2026 07:02:05 +0000
Srirangan Madhavan <smadhavan at nvidia.com> wrote:

> Add a cache maintenance provider for the cache clean+invalidate interface
> defined by Arm DEN0028 v1.7.
> 
> Register the interface attributes function as an SMCCC device and bind the
> provider through the SMCCC bus. The provider reads the firmware attributes
> during probe and serializes cache maintenance calls. It handles transient
> BUSY and RATE_LIMITED responses with bounded retries. It also registers
> with the generic cache coherency framework used by memregion callers.
> 
> Signed-off-by: Srirangan Madhavan <smadhavan at nvidia.com>

I'm fine with the changes to put it on the bus and Andre's suggestion to drop
the latency value handling. So with that done

Reviewed-by: Jonathan Cameron <jonathan.cameron at oss.qualcomm.com>

I'd probably not have bothered with the mutex_destroy() given limited
utility vs code added (I mind that less if devm is appropriate, but doing
that here would be messy).  If we ever see a use of that after the destroy
then something exceedingly weird is going on!

Anyhow, doesn't really matter either way.

Jonathan