Current File : //usr/src/linux-headers-5.15.0-43/arch/powerpc/include/asm/cpuidle.h
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_POWERPC_CPUIDLE_H
#define _ASM_POWERPC_CPUIDLE_H
#ifdef CONFIG_PPC_POWERNV
/* Thread state 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
/*
* Core state used in powernv idle for POWER8.
*
* The lock bit synchronizes updates to the state, as well as parts of the
* sleep/wake code (see kernel/idle_book3s.S).
*
* Bottom 8 bits track the idle state of each thread. Bit is cleared before
* the thread executes an idle instruction (nap/sleep/winkle).
*
* Then there is winkle tracking. A core does not lose complete state
* until every thread is in winkle. So the winkle count field counts the
* number of threads in winkle (small window of false positives is okay
* around the sleep/wake, so long as there are no false negatives).
*
* When the winkle count reaches 8 (the COUNT_ALL_BIT becomes set), then
* the THREAD_WINKLE_BITS are set, which indicate which threads have not
* yet woken from the winkle state.
*/
#define NR_PNV_CORE_IDLE_LOCK_BIT 28
#define PNV_CORE_IDLE_LOCK_BIT (1ULL << NR_PNV_CORE_IDLE_LOCK_BIT)
#define PNV_CORE_IDLE_WINKLE_COUNT_SHIFT 16
#define PNV_CORE_IDLE_WINKLE_COUNT 0x00010000
#define PNV_CORE_IDLE_WINKLE_COUNT_BITS 0x000F0000
#define PNV_CORE_IDLE_THREAD_WINKLE_BITS_SHIFT 8
#define PNV_CORE_IDLE_THREAD_WINKLE_BITS 0x0000FF00
#define PNV_CORE_IDLE_THREAD_BITS 0x000000FF
/*
* ============================ NOTE =================================
* The older firmware populates only the RL field in the psscr_val and
* sets the psscr_mask to 0xf. On such a firmware, the kernel sets the
* remaining PSSCR fields to default values as follows:
*
* - ESL and EC bits are to 1. So wakeup from any stop state will be
* at vector 0x100.
*
* - MTL and PSLL are set to the maximum allowed value as per the ISA,
* i.e. 15.
*
* - The Transition Rate, TR is set to the Maximum value 3.
*/
#define PSSCR_HV_DEFAULT_VAL (PSSCR_ESL | PSSCR_EC | \
PSSCR_PSLL_MASK | PSSCR_TR_MASK | \
PSSCR_MTL_MASK)
#define PSSCR_HV_DEFAULT_MASK (PSSCR_ESL | PSSCR_EC | \
PSSCR_PSLL_MASK | PSSCR_TR_MASK | \
PSSCR_MTL_MASK | PSSCR_RL_MASK)
#define PSSCR_EC_SHIFT 20
#define PSSCR_ESL_SHIFT 21
#define GET_PSSCR_EC(x) (((x) & PSSCR_EC) >> PSSCR_EC_SHIFT)
#define GET_PSSCR_ESL(x) (((x) & PSSCR_ESL) >> PSSCR_ESL_SHIFT)
#define GET_PSSCR_RL(x) ((x) & PSSCR_RL_MASK)
#define ERR_EC_ESL_MISMATCH -1
#define ERR_DEEP_STATE_ESL_MISMATCH -2
#ifndef __ASSEMBLY__
#define PNV_IDLE_NAME_LEN 16
struct pnv_idle_states_t {
char name[PNV_IDLE_NAME_LEN];
u32 latency_ns;
u32 residency_ns;
u64 psscr_val;
u64 psscr_mask;
u32 flags;
bool valid;
};
extern struct pnv_idle_states_t *pnv_idle_states;
extern int nr_pnv_idle_states;
unsigned long pnv_cpu_offline(unsigned int cpu);
int validate_psscr_val_mask(u64 *psscr_val, u64 *psscr_mask, u32 flags);
static inline void report_invalid_psscr_val(u64 psscr_val, int err)
{
switch (err) {
case ERR_EC_ESL_MISMATCH:
pr_warn("Invalid psscr 0x%016llx : ESL,EC bits unequal",
psscr_val);
break;
case ERR_DEEP_STATE_ESL_MISMATCH:
pr_warn("Invalid psscr 0x%016llx : ESL cleared for deep stop-state",
psscr_val);
}
}
#endif
#endif
#endif
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