On Fri, Oct 13, 2023 at 01:48:32PM +0200, Bartosz Golaszewski wrote: > From: Bartosz Golaszewski <bartosz.golaszewski@xxxxxxxxxx> > > We have several SCM calls that require passing buffers to the TrustZone > on top of the SMC core which allocates memory for calls that require > more than 4 arguments. > > Currently every user does their own thing which leads to code > duplication. Many users call dma_alloc_coherent() for every call which > is terribly unperformant (speed- and size-wise). > > Provide a set of library functions for creating and managing pool of > memory which is suitable for sharing with the TrustZone, that is: > page-aligned, contiguous and non-cachable as well as provides a way of > mapping of kernel virtual addresses to physical space. > > Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@xxxxxxxxxx> I'm still on the fence about introducing the Kconfig for the "just in case the hypervisor is bad on some boards", but I spent a while looking at this and it all looks good to me, so that opinion aside... Reviewed-by: Andrew Halaney <ahalaney@xxxxxxxxxx>
