On Tue, Nov 30, 2021 at 10:29:46AM +0100, Daniel Lezcano wrote:

On 06/11/2021 02:33, Ricardo Neri wrote:

quoted

From: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>

Add a new netlink event to notify change in CPU capabilities in terms of
performance and efficiency.

Firmware may change CPU capabilities as a result of thermal events in the
system or to account for changes in the TDP (thermal design power) level.

This notification type will allow user space to avoid running workloads
on certain CPUs or proactively adjust power limits to avoid future events.

[ ... ]

quoted

+	[THERMAL_GENL_ATTR_CPU_CAPABILITY_ID]	= { .type = NLA_U32 },
+	[THERMAL_GENL_ATTR_CPU_CAPABILITY_PERF]	= { .type = NLA_U32 },
+	[THERMAL_GENL_ATTR_CPU_CAPABILITY_EFF]	= { .type = NLA_U32 },
 };

AFAIU, 0 <= perf < 256 and 0 <= eff < 256, right?

Is the following true?

	0 <= perf + eff < 256

No, they are not. They are set independently.

Thanks and BR,
Ricardo