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| author | Zi Shen Lim <zlim@broadcom.com> | 2014-06-07 01:55:27 +0100 |
|---|---|---|
| committer | Catalin Marinas <catalin.marinas@arm.com> | 2014-07-09 12:22:40 +0100 |
| commit | 4e6f7084096c08e37f909d7b075a91b72580405f (patch) | |
| tree | 701d86fcc8f65fae5579532aabd623b34e08c7dd /arch/arm64/include | |
| parent | cd3de83f147601356395b57a8673e9c5ff1e59d1 (diff) | |
| download | linux-4e6f7084096c08e37f909d7b075a91b72580405f.tar.gz linux-4e6f7084096c08e37f909d7b075a91b72580405f.tar.bz2 linux-4e6f7084096c08e37f909d7b075a91b72580405f.zip | |
arm64: topology: add MPIDR-based detection
Create cpu topology based on MPIDR. When hardware sets MPIDR to sane
values, this method will always work. Therefore it should also work well
as the fallback method. [1]
When we have multiple processing elements in the system, we create
the cpu topology by mapping each affinity level (from lowest to highest)
to threads (if they exist), cores, and clusters.
[1] http://www.spinics.net/lists/arm-kernel/msg317445.html
Acked-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: Zi Shen Lim <zlim@broadcom.com>
Signed-off-by: Mark Brown <broonie@linaro.org>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'arch/arm64/include')
| -rw-r--r-- | arch/arm64/include/asm/cputype.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/cputype.h b/arch/arm64/include/asm/cputype.h index 27f54a7cc81b..ed48a3a7836a 100644 --- a/arch/arm64/include/asm/cputype.h +++ b/arch/arm64/include/asm/cputype.h @@ -18,6 +18,8 @@ #define INVALID_HWID ULONG_MAX +#define MPIDR_UP_BITMASK (0x1 << 30) +#define MPIDR_MT_BITMASK (0x1 << 24) #define MPIDR_HWID_BITMASK 0xff00ffffff #define MPIDR_LEVEL_BITS_SHIFT 3 |