3 Commits

Author	SHA1	Message	Date
Srinivas Pandruvada	930d06bf07	thermal: intel: Protect clearing of thermal status bits ... The clearing of the package thermal status is done by Read-Modify-Write operation. This may result in clearing of some new status bits which are being or about to be processed. For example, while clearing of HFI status, after read of thermal status register, a new thermal status bit is set by the hardware. But during write back, the newly generated status bit will be set to 0 or cleared. So, it is not safe to do read-modify-write. Since thermal status Read-Write bits can be set to only 0 not 1, it is safe to set all other bits to 1 which are not getting cleared. Create a common interface for clearing package thermal status bits. Use this interface to replace existing code to clear thermal package status bits. It is safe to call from different CPUs without protection as there is no read-modify-write. Also wrmsrl results in just single instruction. For example while CPU 0 and CPU 3 are clearing bit 1 and 3 respectively. If CPU 3 wins the race, it will write 0x4000aa2, then CPU 1 will write 0x4000aa8. The bits which are not part of clear are set to 1. The default mask for bits, which can be written here is 0x4000aaa. Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> Reviewed-by: Ricardo Neri <ricardo.neri-calderon@linux.intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>	2022-11-23 20:09:06 +01:00
Srinivas Pandruvada	950809cd6c	thermal: intel: Allow processing of HWP interrupt ... Add a weak function to process HWP (Hardware P-states) notifications and move updating HWP_STATUS MSR to this function. This allows HWP interrupts to be processed by the intel_pstate driver in HWP mode by overriding the implementation. Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> Acked-by: Zhang Rui <rui.zhang@intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>	2021-08-25 20:09:37 +02:00
Borislav Petkov	9223d0dccb	thermal: Move therm_throt there from x86/mce ... This functionality has nothing to do with MCE, move it to the thermal framework and untangle it from MCE. Requested-by: Peter Zijlstra <peterz@infradead.org> Signed-off-by: Borislav Petkov <bp@suse.de> Reviewed-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> Tested-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> Link: https://lkml.kernel.org/r/20210202121003.GD18075@zn.tnic	2021-02-08 11:43:20 +01:00