From 21c0d66a9c994c7a406f8a6d04a81c16332e0cb8 Mon Sep 17 00:00:00 2001 From: Benjamin Herrenschmidt Date: Fri, 15 Feb 2019 17:16:41 +0100 Subject: [PATCH] target/ppc: Fix support for "STOP light" states on POWER9 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit STOP must act differently based on PSSCR:EC on POWER9. When set, it acts like the P7/P8 power management instructions and wake up at 0x100 based on the wakeup conditions in LPCR. When PSSCR:EC is clear however it will wakeup at the next instruction after STOP (if EE is clear) or take the corresponding interrupts (if EE is set). Signed-off-by: Benjamin Herrenschmidt Signed-off-by: Cédric Le Goater Reviewed-by: David Gibson Message-Id: <20190215161648.9600-4-clg@kaod.org> Signed-off-by: David Gibson --- target/ppc/cpu-qom.h | 1 + target/ppc/cpu.h | 12 +++++++++--- target/ppc/excp_helper.c | 8 ++++++-- target/ppc/translate.c | 13 ++++++++++++- target/ppc/translate_init.inc.c | 7 +++++++ 5 files changed, 35 insertions(+), 6 deletions(-) diff --git a/target/ppc/cpu-qom.h b/target/ppc/cpu-qom.h index 3130802304..e9cb158423 100644 --- a/target/ppc/cpu-qom.h +++ b/target/ppc/cpu-qom.h @@ -122,6 +122,7 @@ typedef enum { PPC_PM_NAP, PPC_PM_SLEEP, PPC_PM_RVWINKLE, + PPC_PM_STOP, } powerpc_pm_insn_t; /*****************************************************************************/ diff --git a/target/ppc/cpu.h b/target/ppc/cpu.h index 325ebbeb98..5b1899bfc9 100644 --- a/target/ppc/cpu.h +++ b/target/ppc/cpu.h @@ -414,6 +414,10 @@ struct ppc_slb_t { #define LPCR_HVICE PPC_BIT(62) /* HV Virtualisation Int Enable */ #define LPCR_HDICE PPC_BIT(63) +/* PSSCR bits */ +#define PSSCR_ESL PPC_BIT(42) /* Enable State Loss */ +#define PSSCR_EC PPC_BIT(43) /* Exit Criterion */ + #define msr_sf ((env->msr >> MSR_SF) & 1) #define msr_isf ((env->msr >> MSR_ISF) & 1) #define msr_shv ((env->msr >> MSR_SHV) & 1) @@ -1110,9 +1114,11 @@ struct CPUPPCState { * instructions and SPRs are diallowed if MSR:HV is 0 */ bool has_hv_mode; - /* On P7/P8, set when in PM state, we need to handle resume - * in a special way (such as routing some resume causes to - * 0x100), so flag this here. + + /* + * On P7/P8/P9, set when in PM state, we need to handle resume in + * a special way (such as routing some resume causes to 0x100), so + * flag this here. */ bool in_pm_state; #endif diff --git a/target/ppc/excp_helper.c b/target/ppc/excp_helper.c index 7c7c8d1b9d..97503193ef 100644 --- a/target/ppc/excp_helper.c +++ b/target/ppc/excp_helper.c @@ -97,7 +97,10 @@ static inline void powerpc_excp(PowerPCCPU *cpu, int excp_model, int excp) asrr0 = -1; asrr1 = -1; - /* check for special resume at 0x100 from doze/nap/sleep/winkle on P7/P8 */ + /* + * check for special resume at 0x100 from doze/nap/sleep/winkle on + * P7/P8/P9 + */ if (env->in_pm_state) { env->in_pm_state = false; @@ -960,7 +963,8 @@ void helper_pminsn(CPUPPCState *env, powerpc_pm_insn_t insn) env->pending_interrupts &= ~(1 << PPC_INTERRUPT_HDECR); /* Condition for waking up at 0x100 */ - env->in_pm_state = true; + env->in_pm_state = (insn != PPC_PM_STOP) || + (env->spr[SPR_PSSCR] & PSSCR_EC); } #endif /* defined(TARGET_PPC64) */ diff --git a/target/ppc/translate.c b/target/ppc/translate.c index bffdbd9687..fde7ead7b7 100644 --- a/target/ppc/translate.c +++ b/target/ppc/translate.c @@ -3589,7 +3589,18 @@ static void gen_nap(DisasContext *ctx) static void gen_stop(DisasContext *ctx) { - gen_nap(ctx); +#if defined(CONFIG_USER_ONLY) + GEN_PRIV; +#else + TCGv_i32 t; + + CHK_HV; + t = tcg_const_i32(PPC_PM_STOP); + gen_helper_pminsn(cpu_env, t); + tcg_temp_free_i32(t); + /* Stop translation, as the CPU is supposed to sleep from now */ + gen_exception_nip(ctx, EXCP_HLT, ctx->base.pc_next); +#endif /* defined(CONFIG_USER_ONLY) */ } static void gen_sleep(DisasContext *ctx) diff --git a/target/ppc/translate_init.inc.c b/target/ppc/translate_init.inc.c index d884906004..8b1d324b3b 100644 --- a/target/ppc/translate_init.inc.c +++ b/target/ppc/translate_init.inc.c @@ -8801,9 +8801,16 @@ static bool cpu_has_work_POWER9(CPUState *cs) CPUPPCState *env = &cpu->env; if (cs->halted) { + uint64_t psscr = env->spr[SPR_PSSCR]; + if (!(cs->interrupt_request & CPU_INTERRUPT_HARD)) { return false; } + + /* If EC is clear, just return true on any pending interrupt */ + if (!(psscr & PSSCR_EC)) { + return true; + } /* External Exception */ if ((env->pending_interrupts & (1u << PPC_INTERRUPT_EXT)) && (env->spr[SPR_LPCR] & LPCR_EEE)) {