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path: root/drivers/platform/x86/intel/uncore-frequency
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2022-09-27platform/x86: intel-uncore-freq: Use sysfs_emit() to instead of scnprintf()ye xingchen1-1/+1
Replace the open-code with sysfs_emit() to simplify the code. Signed-off-by: ye xingchen <ye.xingchen@zte.com.cn> Link: https://lore.kernel.org/r/20220923063314.239146-1-ye.xingchen@zte.com.cn Reviewed-by: Hans de Goede <hdegoede@redhat.com> Signed-off-by: Hans de Goede <hdegoede@redhat.com>
2022-04-27platform/x86: intel-uncore-freq: Prevent driver loading in guestsSrinivas Pandruvada1-0/+3
Loading this driver in guests results in unchecked MSR access error for MSR 0x620. There is no use of reading and modifying package/die scope uncore MSRs in guests. So check for CPU feature X86_FEATURE_HYPERVISOR to prevent loading of this driver in guests. Fixes: dbce412a7733 ("platform/x86/intel-uncore-freq: Split common and enumeration part") Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=215870 Suggested-by: Borislav Petkov <bp@suse.de> Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> Link: https://lore.kernel.org/r/20220427100304.2562990-1-srinivas.pandruvada@linux.intel.com Signed-off-by: Hans de Goede <hdegoede@redhat.com>
2022-03-08platform/x86: intel-uncore-freq: fix uncore_freq_common_init() error codesDan Carpenter2-2/+2
Currently the uncore_freq_common_init() return one on success and zero on failure. There is only one caller and it has a "forgot to set the error code" bug. Change uncore_freq_common_init() to return negative error codes which makes the code simpler and avoids this kind of bug in the future. Fixes: dbce412a7733 ("platform/x86/intel-uncore-freq: Split common and enumeration part") Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Acked-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> Link: https://lore.kernel.org/r/20220304131925.GG28739@kili Reviewed-by: Hans de Goede <hdegoede@redhat.com> Signed-off-by: Hans de Goede <hdegoede@redhat.com>
2022-02-17platform/x86/intel-uncore-freq: Split common and enumeration partSrinivas Pandruvada4-283/+365
Split the current driver in two parts: - Common part: All the commom function other than enumeration function. - Enumeration/HW specific part: The current enumeration using CPU model is left in the old module. This uses service of common driver to register sysfs objects. Also provide callbacks for MSR access related to uncore. - Add MODULE_DEVICE_TABLE to uncore-frequency.c No functional changes are expected. Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@intel.com> Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Link: https://lore.kernel.org/r/20220204000306.2517447-5-srinivas.pandruvada@linux.intel.com Signed-off-by: Hans de Goede <hdegoede@redhat.com>
2022-02-17platform/x86/intel/uncore-freq: Display uncore current frequencySrinivas Pandruvada1-9/+62
Add a new sysfs attribute "current_freq_khz" to display current uncore frequency. This value is read from MSR 0x621. Root user permission is required to read uncore current frequency. Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@intel.com> Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Link: https://lore.kernel.org/r/20220204000306.2517447-4-srinivas.pandruvada@linux.intel.com Signed-off-by: Hans de Goede <hdegoede@redhat.com>
2022-02-17platform/x86/intel/uncore-freq: Use sysfs API to create attributesSrinivas Pandruvada1-112/+113
Use of sysfs API is always preferable over using kobject calls to create attributes. Remove usage of kobject_init_and_add() and use sysfs_create_group(). To create relationship between sysfs attribute and uncore instance use device_attribute*, which is defined per uncore instance. To create uniform locking for both read and write attributes take lock in the sysfs callbacks, not in the actual functions where the MSRs are read or updated. No functional changes are expected. Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@intel.com> Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Link: https://lore.kernel.org/r/20220204000306.2517447-3-srinivas.pandruvada@linux.intel.com Signed-off-by: Hans de Goede <hdegoede@redhat.com>
2022-02-17platform/x86/intel/uncore-freq: Move to uncore-frequency folderSrinivas Pandruvada3-0/+480
Move the current driver from platform/x86/intel/uncore-frequency.c to platform/x86/intel/uncore-frequency/uncore-frequency.c. No functional changes are expected. Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@intel.com> Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Link: https://lore.kernel.org/r/20220204000306.2517447-2-srinivas.pandruvada@linux.intel.com Signed-off-by: Hans de Goede <hdegoede@redhat.com>
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