perf/x86/intel/uncore: Defer ADL global PMON enable to enable_box()

Browse source

On some Raptor Cove CPUs, enabling uncore PMON globally at driver init
may increase power consumption even when no perf events are in use.

Drop adl_uncore_msr_init_box() and defer programming the global control
register to enable_box(), so it is only set when a box is actually used.

IMC and IMC freerunning counters use a separate control path and are
unaffected.

Fixes: 772ed05f3c ("perf/x86/intel/uncore: Add Alder Lake support")
Signed-off-by: Zide Chen <zide.chen@intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Dapeng Mi <dapeng1.mi@linux.intel.com>
Cc: stable@vger.kernel.org
Link: https://patch.msgid.link/20260602144908.263680-5-zide.chen@intel.com

...

This commit is contained in:

Zide Chen 2026-06-02 07:49:05 -07:00 • committed by Peter Zijlstra

parent 81ec618f59

commit 9a0bb848a3

1 changed files with 0 additions and 7 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

7

arch/x86/events/intel/uncore_snb.c

View file