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authorSrinivas Pandruvada <srinivas.pandruvada@linux.intel.com>2020-03-05 14:45:18 -0800
committerAndy Shevchenko <andriy.shevchenko@linux.intel.com>2020-03-20 14:46:20 +0200
commitfb186158283958984fecf7c1bbc0833dc76e375b (patch)
tree1b6721087d0b47ab2606107a55d7a99c95267f07 /lib/netdev-notifier-error-inject.c
parent864dc09e692f55fc7a5a87c7411da0a348ac1094 (diff)
tools/power/x86/intel-speed-select: Store topology information
Once the CPU is offline, the topology information (core-id, package-id, die-id) is not accessible via sysfs. So when user selects a config level more than base config 0 and offlined CPUs to match the config level, to return to base config he has to manually online CPUs before. Without this CPUs information mapping from Punit CPU numbering will lot work as it needs atlest package id for each CPU. To avoid this additional steps store the topology information in a file , which is created on the very first run after boot. Since system boots in base config and all CPUs are online, we can get information about every CPU. Once any of the APIs like get_physical_package_id(), get_physical_core_id() or get_physical_die_id() fails to read from sysfs, read from the stored mapping file. This mapping file is stored in /tmp file system. so on every boot it is recreated to make sure that any new CPUs are added to the system before boot are taken into account. But don't use the stored physical device id when trying to get information for CPU to send message in for_each_online_package_in_set(). Here use the real value from syfs and in case fails try the next CPU. Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Diffstat (limited to 'lib/netdev-notifier-error-inject.c')
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