arm64: cpuinfo: remove I-cache VIPT aliasing detection

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The CCSIDR_EL1.{NumSets,Associativity,LineSize} fields are only for use
in conjunction with set/way cache maintenance and are not guaranteed to
represent the actual microarchitectural features of a design.

The architecture explicitly states:

| You cannot make any inference about the actual sizes of caches based
| on these parameters.

We currently use these fields to determine whether or the I-cache is
aliasing, which is bogus and known to break on some platforms. Instead,
assume the I-cache is always aliasing if it advertises a VIPT policy.

Acked-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

...

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Will Deacon 2017-03-10 20:32:20 +00:00 • committed by Catalin Marinas

parent 97da3854c5

commit 3689c75af2

2 changed files with 10 additions and 26 deletions

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13

arch/arm64/include/asm/cachetype.h

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23

arch/arm64/kernel/cpuinfo.c

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