Radu Rendec c931680cfa cacheinfo: Add arm64 early level initializer implementation ... This patch adds an architecture specific early cache level detection handler for arm64. This is basically the CLIDR_EL1 based detection that was previously done (only) in init_cache_level(). This is part of a patch series that attempts to further the work in commit 5944ce092b ("arch_topology: Build cacheinfo from primary CPU"). Previously, in the absence of any DT/ACPI cache info, architecture specific cache detection and info allocation for secondary CPUs would happen in non-preemptible context during early CPU initialization and trigger a "BUG: sleeping function called from invalid context" splat on an RT kernel. This patch does not solve the problem completely for RT kernels. It relies on the assumption that on most systems, the CPUs are symmetrical and therefore have the same number of cache leaves. The cacheinfo memory is allocated early (on the primary CPU), relying on the new handler. If later (when CLIDR_EL1 based detection runs again on the secondary CPU) the initial assumption proves to be wrong and the CPU has in fact more leaves, the cacheinfo memory is reallocated, and that still triggers a splat on an RT kernel. In other words, asymmetrical CPU systems *must* still provide cacheinfo data in DT/ACPI to avoid the splat on RT kernels (unless secondary CPUs happen to have less leaves than the primary CPU). But symmetrical CPU systems (the majority) can now get away without the additional DT/ACPI data and rely on CLIDR_EL1 based detection. Signed-off-by: Radu Rendec <rrendec@redhat.com> Reviewed-by: Pierre Gondois <pierre.gondois@arm.com> Link: https://lore.kernel.org/r/20230412185759.755408-3-rrendec@redhat.com Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>		2023-04-13 09:32:33 +01:00
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boot	We have one small patch to the clk core this time around. It fixes a corner	2023-02-25 15:16:23 -08:00
configs	ARM: SoC fixes for 6.3, part 1	2023-02-27 10:09:40 -08:00
crypto	crypto: arm64/sm4-gcm - Fix possible crash in GCM cryption	2023-02-10 17:20:19 +08:00
hyperv	hyperv: simplify and rename generate_guest_id	2022-09-28 13:36:56 +00:00
include	arm64 fixes:	2023-03-02 14:57:53 -08:00
kernel	cacheinfo: Add arm64 early level initializer implementation	2023-04-13 09:32:33 +01:00
kvm	ARM:	2023-02-25 11:30:21 -08:00
lib	Merge branch 'for-next/sysregs' into for-next/core	2022-12-06 11:32:25 +00:00
mm	arm64 fixes:	2023-03-02 14:57:53 -08:00
net	bpf: Remove prog->active check for bpf_lsm and bpf_iter	2022-10-25 23:11:46 -07:00
tools	ARM:	2023-02-25 11:30:21 -08:00
xen
Kbuild
Kconfig	arm64 fixes:	2023-03-02 14:57:53 -08:00
Kconfig.debug
Kconfig.platforms	arm64 updates for 6.3:	2023-02-21 15:27:48 -08:00
Makefile	arm64 updates for 6.3:	2023-02-21 15:27:48 -08:00