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linux/drivers/powercap
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Zhang Rui a91c6e1170 powercap: intel_rapl_tpmi: Ignore minor version change 
[ Upstream commit 1d39092397 ]

The hardware definition of every TPMI feature contains a major and minor
version. When there is a change in the MMIO offset or change in the
definition of a field, hardware will change major version. For addition
of new fields without modifying existing MMIO offsets or fields, only
the minor version is changed.

If the driver has not been updated to recognize a new hardware major
version, it cannot provide the RAPL interface to users due to possible
register layout incompatibilities. However, the driver does not need to
be updated every time the hardware minor version changes because in that
case it will just miss some new functionality exposed by the hardware.

The current implementation causes the driver to refuse to work for any
hardware version change which is unnecessarily restrictive.

If there is a minor version mismatch, log an information message and
continue, but if there is a major version mismatch, log a warning and
exit (as before).

Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Reviewed-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Link: https://patch.msgid.link/20240930081801.28502-4-rui.zhang@intel.com
Fixes: 9eef7f9da9 ("powercap: intel_rapl: Introduce RAPL TPMI interface driver")
[ rjw: Changelog edits ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2024-10-17 15:24:26 +02:00
..
arm_scmi_powercap.c powercap: arm_scmi: Remove recursion while parsing zones 2023-07-20 20:27:10 +02:00
dtpm.c powercap: DTPM: Fix spelling mistake "initialze" -> "initialize" 2022-03-01 18:59:35 +01:00
dtpm_cpu.c powercap: dtpm_cpu: Fix error check against freq_qos_add_request() 2024-03-26 18:19:31 -04:00
dtpm_devfreq.c powercap: DTPM: Fix unneeded conversions to micro-Watts 2023-12-08 08:52:18 +01:00
dtpm_subsys.h powercap/drivers/dtpm: Add dtpm devfreq with energy model support 2022-02-04 17:38:09 +01:00
idle_inject.c Thermal control updates for 6.3-rc1 2023-02-21 12:32:05 -08:00
intel_rapl_common.c powercap: intel_rapl: Fix off by one in get_rpi() 2024-10-04 16:28:51 +02:00
intel_rapl_msr.c powercap: intel_rapl: Fix locking in TPMI RAPL 2024-04-03 15:28:19 +02:00
intel_rapl_tpmi.c powercap: intel_rapl_tpmi: Ignore minor version change 2024-10-17 15:24:26 +02:00
Kconfig powercap: RAPL: Fix CONFIG_IOSF_MBI dependency 2023-06-12 19:48:40 +02:00
Makefile powercap: intel_rapl: Introduce RAPL TPMI interface driver 2023-05-24 18:46:20 +02:00
powercap_sys.c powercap: remove MODULE_LICENSE in non-modules 2023-02-28 21:32:05 +01:00