kernel/linux.git/drivers/powercap, branch v4.14.263

powercap: restrict energy meter to root access

2020-11-10T20:10:28+00:00

commit 949dd0104c496fa7c14991a23c03c62e44637e71 upstream. Remove non-privileged user access to power data contained in /sys/class/powercap/intel-rapl*/*/energy_uj Non-privileged users currently have read access to power data and can use this data to form a security attack. Some privileged drivers/applications need read access to this data, but don't expose it to non-privileged users. For example, thermald uses this data to ensure that power management works correctly. Thus removing non-privileged access is preferred over completely disabling this power reporting capability with CONFIG_INTEL_RAPL=n. Fixes: 95677a9a3847 ("PowerCap: Fix mode for energy counter") Signed-off-by: Len Brown Cc: stable@vger.kernel.org Signed-off-by: Greg Kroah-Hartman

x86/cpu: Sanitize FAM6_ATOM naming

2019-05-14T17:18:42+00:00

commit f2c4db1bd80720cd8cb2a5aa220d9bc9f374f04e upstream Going primarily by: https://en.wikipedia.org/wiki/List_of_Intel_Atom_microprocessors with additional information gleaned from other related pages; notably: - Bonnell shrink was called Saltwell - Moorefield is the Merriefield refresh which makes it Airmont The general naming scheme is: FAM6_ATOM_UARCH_SOCTYPE for i in `git grep -l FAM6_ATOM` ; do sed -i -e 's/ATOM_PINEVIEW/ATOM_BONNELL/g' \ -e 's/ATOM_LINCROFT/ATOM_BONNELL_MID/' \ -e 's/ATOM_PENWELL/ATOM_SALTWELL_MID/g' \ -e 's/ATOM_CLOVERVIEW/ATOM_SALTWELL_TABLET/g' \ -e 's/ATOM_CEDARVIEW/ATOM_SALTWELL/g' \ -e 's/ATOM_SILVERMONT1/ATOM_SILVERMONT/g' \ -e 's/ATOM_SILVERMONT2/ATOM_SILVERMONT_X/g' \ -e 's/ATOM_MERRIFIELD/ATOM_SILVERMONT_MID/g' \ -e 's/ATOM_MOOREFIELD/ATOM_AIRMONT_MID/g' \ -e 's/ATOM_DENVERTON/ATOM_GOLDMONT_X/g' \ -e 's/ATOM_GEMINI_LAKE/ATOM_GOLDMONT_PLUS/g' ${i} done Signed-off-by: Peter Zijlstra (Intel) Cc: Alexander Shishkin Cc: Arnaldo Carvalho de Melo Cc: Jiri Olsa Cc: Linus Torvalds Cc: Peter Zijlstra Cc: Stephane Eranian Cc: Thomas Gleixner Cc: Vince Weaver Cc: dave.hansen@linux.intel.com Cc: len.brown@intel.com Signed-off-by: Ingo Molnar Signed-off-by: Thomas Gleixner Signed-off-by: Greg Kroah-Hartman

powercap/RAPL: prevent overridding bits outside of the mask

2017-06-27T22:38:34+00:00

Fixes wrong bits shift operation in the rapl_write_data_raw function, which might cause overridding bits outside of the mask. For example, writing new TIME_WINDOW1 value can override POWER_LIMIT1. Signed-off-by: Adam Lessnau Signed-off-by: Rafael J. Wysocki

PowerCap: Fix an error code in powercap_register_zone()

2017-05-14T11:30:05+00:00

In the current code we accidentally return the successful result from idr_alloc() instead of a negative error pointer. The caller is looking for an error pointer and so it treats the returned value as a valid pointer. This one might be a bit serious because if it lets people get around the kernel's protection for remapping NULL. I'm not sure. Fixes: 75d2364ea0ca (PowerCap: Add class driver) Signed-off-by: Dan Carpenter Reviewed-by: Srinivas Pandruvada Signed-off-by: Rafael J. Wysocki

powercap: intel_rapl: Add support for Gemini Lake

2017-04-28T21:56:16+00:00

Gemini Lake RAPL support is similar to Goldmont. Signed-off-by: David E. Box Acked-by: Pan, Jacob jun Signed-off-by: Rafael J. Wysocki

powercap / RAPL: Add Knights Mill CPUID

2016-11-30T22:41:33+00:00

Add Knights Mill (KNM) to the list of CPUIDs supported by intel_rapl Signed-off-by: Piotr Luc Reviewed-by: Dave Hansen Signed-off-by: Rafael J. Wysocki

powercap/intel_rapl: fix and tidy up error handling

2016-11-28T23:02:29+00:00

Commit e1399ba20eee ("powercap / RAPL: handle missing MSRs") added contraint_to_pl() function to return index into an array. But it can potentially return -EINVAL if powercap layer sends an out of range constraint ID. This patch adds sanity check. Unnecessary RAPL domain pointer check is removed since it must be initialized before calling rapl_unit_xlate(). Fixes: e1399ba20eee ("powercap / RAPL: handle missing MSRs") Reported-by: Odzioba, Lukasz Reported-by: Koss, Marcin Signed-off-by: Jacob Pan Signed-off-by: Rafael J. Wysocki

powercap/intel_rapl: Track active CPUs internally

2016-11-24T20:58:32+00:00

The ability of the CPU hotplug code to stop online/offline at each step makes it necessary to track the activated CPUs in a package directly, because outerwise a CPU offline callback can find CPUs which have already executed the offline callback, but are not yet marked offline in the topology mask. That could make such a CPU the package leader and in case that CPU goes fully offline leave the package lead orphaned. Signed-off-by: Thomas Gleixner Tested-by: Jacob Pan Signed-off-by: Rafael J. Wysocki

powercap/intel_rapl: Cleanup duplicated init code

2016-11-24T20:58:32+00:00

The whole init/exit code is a duplicate of the cpuhotplug code. So we can just let the hotplug code do the actual work of setting up and tearing down the domains. This also restores the package hardware when a package is removed during hotplug instead of leaving it in the last configured state and only reset it when the driver is removed. Signed-off-by: Thomas Gleixner Tested-by: Jacob Pan Signed-off-by: Rafael J. Wysocki

powercap/intel rapl: Convert to hotplug state machine

2016-11-24T20:58:32+00:00

Install the callbacks via the state machine as a first step. The init/exit code is a duplicate of the hotplug code. This is cleaned up in a consecutive patch. Signed-off-by: Sebastian Andrzej Siewior Signed-off-by: Thomas Gleixner Tested-by: Jacob Pan Signed-off-by: Rafael J. Wysocki