Re: [RFC PATCH 3/5] acpi/hmat: Track target address ranges

[Keith Busch]

On Thu, Apr 04, 2019 at 12:08:44PM -0700, Dan Williams wrote:
> As of ACPI 6.3 the HMAT no longer advertises the physical memory address
> range for its entries. Instead, the expectation is the corresponding
> entry in the SRAT is looked up by the target proximity domain.
> 
> Given there may be multiple distinct address ranges that share the same
> performance profile (sparse address space), find_mem_target() is updated
> to also consider the start address of the memory range. Target property
> updates are also adjusted to loop over all possible 'struct target'
> instances that may share the same proximity domain identification.

Since this may allocate multiple targets with the same PXM,
hmat_register_targets() will attempt to register the same node multiple
times.

Would it make sense if the existing struct memory_target adds a resource
list that we can append to as we parse SRAT? That way we have one target
per memory node, and also track the ranges.