2023-07-05 13:19:59 +00:00
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# udev rules specific to RHEL-RT Realtime kernel
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2023-07-05 13:58:24 +00:00
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#
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# SPDX-License-Identifier: GPL-2.0-or-later
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#
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2023-07-05 13:19:59 +00:00
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# insure /dev/rtc points to /dev/rtc0
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# we use PROGRAM rather than SYMLINK because there is
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# a (good) possibility that a /dev/rtc device file
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# already exists and we want to replace it (hence the
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# ln -sf)
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KERNEL=="rtc0", PROGRAM+="/bin/ln -sf rtc0 /dev/rtc"
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# Give permission to the realtime group to write a zero to /dev/cpu_dma_latency
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# This will tell the power management system not to transition to a high cstate
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KERNEL=="cpu_dma_latency", GROUP="realtime"
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# Give permission to the realtime group to read the per cpu msr and cpuid
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# registers. This is needed by cyclictest in rt-tests when using the new
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# feature to read the smi counters. This is necessary but not sufficient
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# A program that wants to access these registers will also need CAP_SYS_RAWIO
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SUBSYSTEM=="msr", GROUP="realtime", MODE="0640"
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SUBSYSTEM=="cpuid", GROUP="realtime", MODE="0640"
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