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| author | Mark Brown <broonie@kernel.org> | 2022-06-07 16:28:57 +0300 |
|---|---|---|
| committer | Will Deacon <will@kernel.org> | 2022-06-23 20:22:44 +0300 |
| commit | d69d564964872f52c4a8f0db172d842eaf3b84cf (patch) | |
| tree | be7531263167a1b95e57b1ae571987f5f00b0bcf /Documentation/ABI/testing/sysfs-devices-system-cpu | |
| parent | a111daf0c53ae91e71fd2bfe7497862d14132e3e (diff) | |
| download | linux-d69d564964872f52c4a8f0db172d842eaf3b84cf.tar.xz | |
arm64/sme: Expose SMIDR through sysfs
We currently expose MIDR and REVID to userspace through sysfs to enable it
to make decisions based on the specific implementation. Since SME supports
implementations where streaming mode is provided by a separate hardware
unit called a SMCU it provides a similar ID register SMIDR. Expose it to
userspace via sysfs when the system supports SME along with the other ID
registers.
Since we disable the SME priority mapping feature if it is supported by
hardware we currently mask out the SMPS bit which reports that it is
supported.
Signed-off-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20220607132857.1358361-1-broonie@kernel.org
Signed-off-by: Will Deacon <will@kernel.org>
Diffstat (limited to 'Documentation/ABI/testing/sysfs-devices-system-cpu')
| -rw-r--r-- | Documentation/ABI/testing/sysfs-devices-system-cpu | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/Documentation/ABI/testing/sysfs-devices-system-cpu b/Documentation/ABI/testing/sysfs-devices-system-cpu index bcc974d276dc..df79e129d097 100644 --- a/Documentation/ABI/testing/sysfs-devices-system-cpu +++ b/Documentation/ABI/testing/sysfs-devices-system-cpu @@ -493,12 +493,13 @@ What: /sys/devices/system/cpu/cpuX/regs/ /sys/devices/system/cpu/cpuX/regs/identification/ /sys/devices/system/cpu/cpuX/regs/identification/midr_el1 /sys/devices/system/cpu/cpuX/regs/identification/revidr_el1 + /sys/devices/system/cpu/cpuX/regs/identification/smidr_el1 Date: June 2016 Contact: Linux ARM Kernel Mailing list <linux-arm-kernel@lists.infradead.org> Description: AArch64 CPU registers 'identification' directory exposes the CPU ID registers for - identifying model and revision of the CPU. + identifying model and revision of the CPU and SMCU. What: /sys/devices/system/cpu/aarch32_el0 Date: May 2021 |