On Fri, Feb 25, 2022 at 04:58:54PM +0000, Mark Brown wrote:
The vector lengths used for SME are controlled through a similar set of registers to those for SVE and enumerated using a similar algorithm with some slight differences due to the fact that unlike SVE there are no restrictions on which combinations of vector lengths can be supported nor any mandatory vector lengths which must be implemented. Add a new vector type and implement support for enumerating it.
One slightly awkward feature is that we need to read the current vector length using a different instruction (or enter streaming mode which would have the same issue and be higher cost). Rather than add an ops structure we add special cases directly in the otherwise generic vec_probe_vqs() function, this is a bit inelegant but it's the only place where this is an issue.
Signed-off-by: Mark Brown broonie@kernel.org
Reviewed-by: Catalin Marinas catalin.marinas@arm.com