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| author | Shanker Donthineni <shankerd@codeaurora.org> | 2018-03-07 16:00:08 +0100 |
|---|---|---|
| committer | Will Deacon <will.deacon@arm.com> | 2018-03-09 14:57:57 +0100 |
| commit | 6ae4b6e0578886eb36cedbf99f04031d93f9e315 (patch) | |
| tree | 0f619237573c089ea1488f3349f9e5bd7d419d7e /arch/arm64/include/asm/cache.h | |
| parent | arm64/kernel: enable A53 erratum #8434319 handling at runtime (diff) | |
| download | linux-6ae4b6e0578886eb36cedbf99f04031d93f9e315.tar.xz linux-6ae4b6e0578886eb36cedbf99f04031d93f9e315.zip | |
arm64: Add support for new control bits CTR_EL0.DIC and CTR_EL0.IDC
The DCache clean & ICache invalidation requirements for instructions
to be data coherence are discoverable through new fields in CTR_EL0.
The following two control bits DIC and IDC were defined for this
purpose. No need to perform point of unification cache maintenance
operations from software on systems where CPU caches are transparent.
This patch optimize the three functions __flush_cache_user_range(),
clean_dcache_area_pou() and invalidate_icache_range() if the hardware
reports CTR_EL0.IDC and/or CTR_EL0.IDC. Basically it skips the two
instructions 'DC CVAU' and 'IC IVAU', and the associated loop logic
in order to avoid the unnecessary overhead.
CTR_EL0.DIC: Instruction cache invalidation requirements for
instruction to data coherence. The meaning of this bit[29].
0: Instruction cache invalidation to the point of unification
is required for instruction to data coherence.
1: Instruction cache cleaning to the point of unification is
not required for instruction to data coherence.
CTR_EL0.IDC: Data cache clean requirements for instruction to data
coherence. The meaning of this bit[28].
0: Data cache clean to the point of unification is required for
instruction to data coherence, unless CLIDR_EL1.LoC == 0b000
or (CLIDR_EL1.LoUIS == 0b000 && CLIDR_EL1.LoUU == 0b000).
1: Data cache clean to the point of unification is not required
for instruction to data coherence.
Co-authored-by: Philip Elcan <pelcan@codeaurora.org>
Reviewed-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Shanker Donthineni <shankerd@codeaurora.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'arch/arm64/include/asm/cache.h')
| -rw-r--r-- | arch/arm64/include/asm/cache.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/cache.h b/arch/arm64/include/asm/cache.h index b2e6ece23713..5df5cfe1c143 100644 --- a/arch/arm64/include/asm/cache.h +++ b/arch/arm64/include/asm/cache.h @@ -20,8 +20,12 @@ #define CTR_L1IP_SHIFT 14 #define CTR_L1IP_MASK 3 +#define CTR_DMINLINE_SHIFT 16 +#define CTR_ERG_SHIFT 20 #define CTR_CWG_SHIFT 24 #define CTR_CWG_MASK 15 +#define CTR_IDC_SHIFT 28 +#define CTR_DIC_SHIFT 29 #define CTR_L1IP(ctr) (((ctr) >> CTR_L1IP_SHIFT) & CTR_L1IP_MASK) |