mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-24 01:53:15 +07:00
7cba160ad7
Deep idle states like sleep and winkle are per core idle states. A core enters these states only when all the threads enter either the particular idle state or a deeper one. There are tasks like fastsleep hardware bug workaround and hypervisor core state save which have to be done only by the last thread of the core entering deep idle state and similarly tasks like timebase resync, hypervisor core register restore that have to be done only by the first thread waking up from these state. The current idle state management does not have a way to distinguish the first/last thread of the core waking/entering idle states. Tasks like timebase resync are done for all the threads. This is not only is suboptimal, but can cause functionality issues when subcores and kvm is involved. This patch adds the necessary infrastructure to track idle states of threads in a per-core structure. It uses this info to perform tasks like fastsleep workaround and timebase resync only once per core. Signed-off-by: Shreyas B. Prabhu <shreyas@linux.vnet.ibm.com> Originally-by: Preeti U. Murthy <preeti@linux.vnet.ibm.com> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Rafael J. Wysocki <rjw@rjwysocki.net> Cc: linux-pm@vger.kernel.org Cc: linuxppc-dev@lists.ozlabs.org Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
21 lines
533 B
C
21 lines
533 B
C
#ifndef _ASM_POWERPC_CPUIDLE_H
|
|
#define _ASM_POWERPC_CPUIDLE_H
|
|
|
|
#ifdef CONFIG_PPC_POWERNV
|
|
/* Used in powernv idle state management */
|
|
#define PNV_THREAD_RUNNING 0
|
|
#define PNV_THREAD_NAP 1
|
|
#define PNV_THREAD_SLEEP 2
|
|
#define PNV_THREAD_WINKLE 3
|
|
#define PNV_CORE_IDLE_LOCK_BIT 0x100
|
|
#define PNV_CORE_IDLE_THREAD_BITS 0x0FF
|
|
|
|
#ifndef __ASSEMBLY__
|
|
extern u32 pnv_fastsleep_workaround_at_entry[];
|
|
extern u32 pnv_fastsleep_workaround_at_exit[];
|
|
#endif
|
|
|
|
#endif
|
|
|
|
#endif
|