diff options
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/powerpc/include/asm/cpuidle.h | 44 | ||||
| -rw-r--r-- | arch/powerpc/include/asm/processor.h | 3 | ||||
| -rw-r--r-- | arch/powerpc/kernel/idle_book3s.S | 30 | ||||
| -rw-r--r-- | arch/powerpc/platforms/powernv/idle.c | 138 | ||||
| -rw-r--r-- | arch/powerpc/platforms/powernv/powernv.h | 3 | ||||
| -rw-r--r-- | arch/powerpc/platforms/powernv/smp.c | 14 |
6 files changed, 200 insertions, 32 deletions
diff --git a/arch/powerpc/include/asm/cpuidle.h b/arch/powerpc/include/asm/cpuidle.h index 0a3255b12587..fd321eb423cb 100644 --- a/arch/powerpc/include/asm/cpuidle.h +++ b/arch/powerpc/include/asm/cpuidle.h @@ -10,11 +10,55 @@ #define PNV_CORE_IDLE_LOCK_BIT 0x100 #define PNV_CORE_IDLE_THREAD_BITS 0x0FF +/* + * ============================ 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__ extern u32 pnv_fastsleep_workaround_at_entry[]; extern u32 pnv_fastsleep_workaround_at_exit[]; extern u64 pnv_first_deep_stop_state; + +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 diff --git a/arch/powerpc/include/asm/processor.h b/arch/powerpc/include/asm/processor.h index 1ba814436c73..21e0b52685b5 100644 --- a/arch/powerpc/include/asm/processor.h +++ b/arch/powerpc/include/asm/processor.h @@ -454,7 +454,8 @@ extern int powersave_nap; /* set if nap mode can be used in idle loop */ extern unsigned long power7_nap(int check_irq); extern unsigned long power7_sleep(void); extern unsigned long power7_winkle(void); -extern unsigned long power9_idle_stop(unsigned long stop_level); +extern unsigned long power9_idle_stop(unsigned long stop_psscr_val, + unsigned long stop_psscr_mask); extern void flush_instruction_cache(void); extern void hard_reset_now(void); diff --git a/arch/powerpc/kernel/idle_book3s.S b/arch/powerpc/kernel/idle_book3s.S index be90e2f62bba..4f6cf5596235 100644 --- a/arch/powerpc/kernel/idle_book3s.S +++ b/arch/powerpc/kernel/idle_book3s.S @@ -40,9 +40,7 @@ #define _WORC GPR11 #define _PTCR GPR12 -#define PSSCR_HV_TEMPLATE PSSCR_ESL | PSSCR_EC | \ - PSSCR_PSLL_MASK | PSSCR_TR_MASK | \ - PSSCR_MTL_MASK +#define PSSCR_EC_ESL_MASK_SHIFTED (PSSCR_EC | PSSCR_ESL) >> 16 .text @@ -264,7 +262,7 @@ enter_winkle: IDLE_STATE_ENTER_SEQ_NORET(PPC_WINKLE) /* - * r3 - requested stop state + * r3 - PSSCR value corresponding to the requested stop state. */ power_enter_stop: #ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE @@ -274,9 +272,18 @@ power_enter_stop: stb r4,HSTATE_HWTHREAD_STATE(r13) #endif /* + * Check if we are executing the lite variant with ESL=EC=0 + */ + andis. r4,r3,PSSCR_EC_ESL_MASK_SHIFTED + clrldi r3,r3,60 /* r3 = Bits[60:63] = Requested Level (RL) */ + bne 1f + IDLE_STATE_ENTER_SEQ(PPC_STOP) + li r3,0 /* Since we didn't lose state, return 0 */ + b pnv_wakeup_noloss +/* * Check if the requested state is a deep idle state. */ - LOAD_REG_ADDRBASE(r5,pnv_first_deep_stop_state) +1: LOAD_REG_ADDRBASE(r5,pnv_first_deep_stop_state) ld r4,ADDROFF(pnv_first_deep_stop_state)(r5) cmpd r3,r4 bge 2f @@ -353,16 +360,17 @@ ALT_FTR_SECTION_END_NESTED_IFSET(CPU_FTR_ARCH_207S, 66); \ ld r3,ORIG_GPR3(r1); /* Restore original r3 */ \ 20: nop; - /* - * r3 - requested stop state + * r3 - The PSSCR value corresponding to the stop state. + * r4 - The PSSCR mask corrresonding to the stop state. */ _GLOBAL(power9_idle_stop) - LOAD_REG_IMMEDIATE(r4, PSSCR_HV_TEMPLATE) - or r4,r4,r3 - mtspr SPRN_PSSCR, r4 - li r4, 1 + mfspr r5,SPRN_PSSCR + andc r5,r5,r4 + or r3,r3,r5 + mtspr SPRN_PSSCR,r3 LOAD_REG_ADDR(r5,power_enter_stop) + li r4,1 b pnv_powersave_common /* No return */ /* diff --git a/arch/powerpc/platforms/powernv/idle.c b/arch/powerpc/platforms/powernv/idle.c index 57bec031291b..4ee837e6391a 100644 --- a/arch/powerpc/platforms/powernv/idle.c +++ b/arch/powerpc/platforms/powernv/idle.c @@ -237,15 +237,21 @@ static DEVICE_ATTR(fastsleep_workaround_applyonce, 0600, show_fastsleep_workaround_applyonce, store_fastsleep_workaround_applyonce); +/* + * The default stop state that will be used by ppc_md.power_save + * function on platforms that support stop instruction. + */ +u64 pnv_default_stop_val; +u64 pnv_default_stop_mask; /* * Used for ppc_md.power_save which needs a function with no parameters */ static void power9_idle(void) { - /* Requesting stop state 0 */ - power9_idle_stop(0); + power9_idle_stop(pnv_default_stop_val, pnv_default_stop_mask); } + /* * First deep stop state. Used to figure out when to save/restore * hypervisor context. @@ -253,9 +259,11 @@ static void power9_idle(void) u64 pnv_first_deep_stop_state = MAX_STOP_STATE; /* - * Deepest stop idle state. Used when a cpu is offlined + * psscr value and mask of the deepest stop idle state. + * Used when a cpu is offlined. */ -u64 pnv_deepest_stop_state; +u64 pnv_deepest_stop_psscr_val; +u64 pnv_deepest_stop_psscr_mask; /* * Power ISA 3.0 idle initialization. @@ -292,6 +300,44 @@ u64 pnv_deepest_stop_state; * Bits 60:63 - Requested Level * Used to specify which power-saving level must be entered on executing * stop instruction + */ + +int validate_psscr_val_mask(u64 *psscr_val, u64 *psscr_mask, u32 flags) +{ + int err = 0; + + /* + * psscr_mask == 0xf indicates an older firmware. + * Set remaining fields of psscr to the default values. + * See NOTE above definition of PSSCR_HV_DEFAULT_VAL + */ + if (*psscr_mask == 0xf) { + *psscr_val = *psscr_val | PSSCR_HV_DEFAULT_VAL; + *psscr_mask = PSSCR_HV_DEFAULT_MASK; + return err; + } + + /* + * New firmware is expected to set the psscr_val bits correctly. + * Validate that the following invariants are correctly maintained by + * the new firmware. + * - ESL bit value matches the EC bit value. + * - ESL bit is set for all the deep stop states. + */ + if (GET_PSSCR_ESL(*psscr_val) != GET_PSSCR_EC(*psscr_val)) { + err = ERR_EC_ESL_MISMATCH; + } else if ((flags & OPAL_PM_LOSE_FULL_CONTEXT) && + GET_PSSCR_ESL(*psscr_val) == 0) { + err = ERR_DEEP_STATE_ESL_MISMATCH; + } + + return err; +} + +/* + * pnv_arch300_idle_init: Initializes the default idle state, first + * deep idle state and deepest idle state on + * ISA 3.0 CPUs. * * @np: /ibm,opal/power-mgt device node * @flags: cpu-idle-state-flags array @@ -302,43 +348,109 @@ static int __init pnv_power9_idle_init(struct device_node *np, u32 *flags, int dt_idle_states) { u64 *psscr_val = NULL; + u64 *psscr_mask = NULL; + u32 *residency_ns = NULL; + u64 max_residency_ns = 0; int rc = 0, i; + bool default_stop_found = false, deepest_stop_found = false; - psscr_val = kcalloc(dt_idle_states, sizeof(*psscr_val), - GFP_KERNEL); - if (!psscr_val) { + psscr_val = kcalloc(dt_idle_states, sizeof(*psscr_val), GFP_KERNEL); + psscr_mask = kcalloc(dt_idle_states, sizeof(*psscr_mask), GFP_KERNEL); + residency_ns = kcalloc(dt_idle_states, sizeof(*residency_ns), + GFP_KERNEL); + + if (!psscr_val || !psscr_mask || !residency_ns) { rc = -1; goto out; } + if (of_property_read_u64_array(np, "ibm,cpu-idle-state-psscr", psscr_val, dt_idle_states)) { - pr_warn("cpuidle-powernv: missing ibm,cpu-idle-states-psscr in DT\n"); + pr_warn("cpuidle-powernv: missing ibm,cpu-idle-state-psscr in DT\n"); + rc = -1; + goto out; + } + + if (of_property_read_u64_array(np, + "ibm,cpu-idle-state-psscr-mask", + psscr_mask, dt_idle_states)) { + pr_warn("cpuidle-powernv: missing ibm,cpu-idle-state-psscr-mask in DT\n"); + rc = -1; + goto out; + } + + if (of_property_read_u32_array(np, + "ibm,cpu-idle-state-residency-ns", + residency_ns, dt_idle_states)) { + pr_warn("cpuidle-powernv: missing ibm,cpu-idle-state-residency-ns in DT\n"); rc = -1; goto out; } /* - * Set pnv_first_deep_stop_state and pnv_deepest_stop_state. + * Set pnv_first_deep_stop_state, pnv_deepest_stop_psscr_{val,mask}, + * and the pnv_default_stop_{val,mask}. + * * pnv_first_deep_stop_state should be set to the first stop * level to cause hypervisor state loss. - * pnv_deepest_stop_state should be set to the deepest stop - * stop state. + * + * pnv_deepest_stop_{val,mask} should be set to values corresponding to + * the deepest stop state. + * + * pnv_default_stop_{val,mask} should be set to values corresponding to + * the shallowest (OPAL_PM_STOP_INST_FAST) loss-less stop state. */ pnv_first_deep_stop_state = MAX_STOP_STATE; for (i = 0; i < dt_idle_states; i++) { + int err; u64 psscr_rl = psscr_val[i] & PSSCR_RL_MASK; if ((flags[i] & OPAL_PM_LOSE_FULL_CONTEXT) && (pnv_first_deep_stop_state > psscr_rl)) pnv_first_deep_stop_state = psscr_rl; - if (pnv_deepest_stop_state < psscr_rl) - pnv_deepest_stop_state = psscr_rl; + err = validate_psscr_val_mask(&psscr_val[i], &psscr_mask[i], + flags[i]); + if (err) { + report_invalid_psscr_val(psscr_val[i], err); + continue; + } + + if (max_residency_ns < residency_ns[i]) { + max_residency_ns = residency_ns[i]; + pnv_deepest_stop_psscr_val = psscr_val[i]; + pnv_deepest_stop_psscr_mask = psscr_mask[i]; + deepest_stop_found = true; + } + + if (!default_stop_found && + (flags[i] & OPAL_PM_STOP_INST_FAST)) { + pnv_default_stop_val = psscr_val[i]; + pnv_default_stop_mask = psscr_mask[i]; + default_stop_found = true; + } + } + + if (!default_stop_found) { + pnv_default_stop_val = PSSCR_HV_DEFAULT_VAL; + pnv_default_stop_mask = PSSCR_HV_DEFAULT_MASK; + pr_warn("Setting default stop psscr val=0x%016llx,mask=0x%016llx\n", + pnv_default_stop_val, pnv_default_stop_mask); + } + + if (!deepest_stop_found) { + pnv_deepest_stop_psscr_val = PSSCR_HV_DEFAULT_VAL; + pnv_deepest_stop_psscr_mask = PSSCR_HV_DEFAULT_MASK; + pr_warn("Setting default stop psscr val=0x%016llx,mask=0x%016llx\n", + pnv_deepest_stop_psscr_val, + pnv_deepest_stop_psscr_mask); } out: kfree(psscr_val); + kfree(psscr_mask); + kfree(residency_ns); return rc; } diff --git a/arch/powerpc/platforms/powernv/powernv.h b/arch/powerpc/platforms/powernv/powernv.h index da7c843ac7f1..613052232475 100644 --- a/arch/powerpc/platforms/powernv/powernv.h +++ b/arch/powerpc/platforms/powernv/powernv.h @@ -18,7 +18,8 @@ static inline void pnv_pci_shutdown(void) { } #endif extern u32 pnv_get_supported_cpuidle_states(void); -extern u64 pnv_deepest_stop_state; +extern u64 pnv_deepest_stop_psscr_val; +extern u64 pnv_deepest_stop_psscr_mask; extern void pnv_lpc_init(void); diff --git a/arch/powerpc/platforms/powernv/smp.c b/arch/powerpc/platforms/powernv/smp.c index c789258ae1e1..1c6405fb769a 100644 --- a/arch/powerpc/platforms/powernv/smp.c +++ b/arch/powerpc/platforms/powernv/smp.c @@ -182,15 +182,17 @@ static void pnv_smp_cpu_kill_self(void) ppc64_runlatch_off(); - if (cpu_has_feature(CPU_FTR_ARCH_300)) - srr1 = power9_idle_stop(pnv_deepest_stop_state); - else if (idle_states & OPAL_PM_WINKLE_ENABLED) + if (cpu_has_feature(CPU_FTR_ARCH_300)) { + srr1 = power9_idle_stop(pnv_deepest_stop_psscr_val, + pnv_deepest_stop_psscr_mask); + } else if (idle_states & OPAL_PM_WINKLE_ENABLED) { srr1 = power7_winkle(); - else if ((idle_states & OPAL_PM_SLEEP_ENABLED) || - (idle_states & OPAL_PM_SLEEP_ENABLED_ER1)) + } else if ((idle_states & OPAL_PM_SLEEP_ENABLED) || + (idle_states & OPAL_PM_SLEEP_ENABLED_ER1)) { srr1 = power7_sleep(); - else + } else { srr1 = power7_nap(1); + } ppc64_runlatch_on(); |