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[124.44.183.209]) by smtp.gmail.com with ESMTPSA id u128sm510393pfb.55.2017.05.03.17.54.10 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Wed, 03 May 2017 17:54:11 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references :in-reply-to:references; bh=9ZK/1O75svRsvUs5m9/Z7c3iaU+T/Tu7NOxwmmb8O5Y=; b=W+9IA7+JfqSoP442X7SYi476VfV/pJy7LqBAjYZGtOjb2n5KiCYSaaVTNWp06O+GyJ rNsnVtpOHwR4b2RyHxwmXvIkIKuJuLpCjvHyJrcEi3E91eRSeg5cpa0cccpzg9g798ur ss8H3IaPZ+qfWEiZ6xSTxL8W3ZzwPuTEt2XB3Fj5qjrs8wOt2MVfsYH5M48gHt3g3/Xo mI9X14JwArwHtA/THXacFclvfHd75MddVeWFgBHhRtjRrQ4/gdgacTUkjIR9bPaNBl6e Kmt3Se7btU9Hr5is3XKTHr+NumynUZmxcj2iDFGGNTHaIb3bnq7XWjPvu6rzo5R73zD7 AW2A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:in-reply-to:references; bh=9ZK/1O75svRsvUs5m9/Z7c3iaU+T/Tu7NOxwmmb8O5Y=; b=cJOePqdWqRGxJkjqamC8ew35yXFmI/4dHosBTsVz1uEGEobqrOmu8o8Q9YSz/MItpK I8zGgBj442t5lLByRhPhk0PA3JMTNMBFQnsmIbfW57IF2Ng0HfwLVOBHriYxerzav9Y+ fNRgIeyQJ3HzbtEpMkiEtHbKPUQuKOS4RHXWTkf9PFVZPsd/+oXvzQTwlcl0gbM1cOPF W/KqipMnS1Gu01azJFcElDr2wyw3uqSum85Ui0/yhPsk0gUGrjzwnLwDagXeBdRLixv0 3bZh28yvMeAKUIfUT1K2J8JdSN6gUeIymUitWALfxz58XZMpg3AgObNlQxEBjB4y8EsC B7IA== X-Gm-Message-State: AN3rC/6mT4tPzjQI7Asr0gs9UPfgO/05+cdjnEwHdsogyrhfGHrtzAfS UIM++XN86+q9gO1c X-Received: by 10.84.217.215 with SMTP id d23mr20582645plj.114.1493859251800; Wed, 03 May 2017 17:54:11 -0700 (PDT) From: Stafford Horne To: QEMU Development Date: Thu, 4 May 2017 09:53:26 +0900 Message-Id: X-Mailer: git-send-email 2.9.3 In-Reply-To: References: In-Reply-To: References: X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 2607:f8b0:400e:c05::241 Subject: [Qemu-devel] [PULL v2 11/11] target/openrisc: Support non-busy idle state using PMR SPR X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Stefan Hajnoczi , Stafford Horne Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) X-ZohoMail: RDKM_2 RSF_0 Z_629925259 SPT_0 Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" The OpenRISC architecture has the Power Management Register (PMR) special purpose register to manage cpu power states. The interesting modes are: * Doze Mode (DME) - Stop cpu except timer & pic - wake on interrupt * Sleep Mode (SME) - Stop cpu and all units - wake on interrupt * Suspend Model (SUME) - Stop cpu and all units - wake on reset The linux kernel will set DME when idle. This patch implements the PMR SPR and halts the qemu cpu when there is a change to DME or SME. This means that openrisc qemu in no longer peggs a host cpu at 100%. In order for this to work we need to kick the CPU when timers are expired. Update the cpu timer to kick the cpu upon each timer event. Reviewed-by: Richard Henderson Signed-off-by: Stafford Horne --- hw/openrisc/cputimer.c | 1 + target/openrisc/cpu.c | 3 ++- target/openrisc/cpu.h | 10 ++++++++++ target/openrisc/interrupt.c | 2 ++ target/openrisc/machine.c | 1 + target/openrisc/sys_helper.c | 13 +++++++++++++ 6 files changed, 29 insertions(+), 1 deletion(-) diff --git a/hw/openrisc/cputimer.c b/hw/openrisc/cputimer.c index a98c799..febc469 100644 --- a/hw/openrisc/cputimer.c +++ b/hw/openrisc/cputimer.c @@ -61,6 +61,7 @@ void cpu_openrisc_timer_update(OpenRISCCPU *cpu) } next =3D now + (uint64_t)wait * TIMER_PERIOD; timer_mod(cpu->env.timer, next); + qemu_cpu_kick(CPU(cpu)); } =20 void cpu_openrisc_count_start(OpenRISCCPU *cpu) diff --git a/target/openrisc/cpu.c b/target/openrisc/cpu.c index c9b3f22..1d6330c 100644 --- a/target/openrisc/cpu.c +++ b/target/openrisc/cpu.c @@ -51,7 +51,8 @@ static void openrisc_cpu_reset(CPUState *s) cpu->env.lock_addr =3D -1; s->exception_index =3D -1; =20 - cpu->env.upr =3D UPR_UP | UPR_DMP | UPR_IMP | UPR_PICP | UPR_TTP; + cpu->env.upr =3D UPR_UP | UPR_DMP | UPR_IMP | UPR_PICP | UPR_TTP | + UPR_PMP; cpu->env.dmmucfgr =3D (DMMUCFGR_NTW & (0 << 2)) | (DMMUCFGR_NTS & (6 <= < 2)); cpu->env.immucfgr =3D (IMMUCFGR_NTW & (0 << 2)) | (IMMUCFGR_NTS & (6 <= < 2)); =20 diff --git a/target/openrisc/cpu.h b/target/openrisc/cpu.h index 938ccc3..2721432 100644 --- a/target/openrisc/cpu.h +++ b/target/openrisc/cpu.h @@ -140,6 +140,15 @@ enum { IMMUCFGR_HTR =3D (1 << 11), }; =20 +/* Power management register */ +enum { + PMR_SDF =3D (15 << 0), + PMR_DME =3D (1 << 4), + PMR_SME =3D (1 << 5), + PMR_DCGE =3D (1 << 6), + PMR_SUME =3D (1 << 7), +}; + /* Float point control status register */ enum { FPCSR_FPEE =3D 1, @@ -284,6 +293,7 @@ typedef struct CPUOpenRISCState { uint32_t immucfgr; /* IMMU configure register */ uint32_t esr; /* Exception supervisor register */ uint32_t evbar; /* Exception vector base address register */ + uint32_t pmr; /* Power Management Register */ uint32_t fpcsr; /* Float register */ float_status fp_status; =20 diff --git a/target/openrisc/interrupt.c b/target/openrisc/interrupt.c index 2c91fab..3959671 100644 --- a/target/openrisc/interrupt.c +++ b/target/openrisc/interrupt.c @@ -60,6 +60,8 @@ void openrisc_cpu_do_interrupt(CPUState *cs) env->sr |=3D SR_SM; env->sr &=3D ~SR_IEE; env->sr &=3D ~SR_TEE; + env->pmr &=3D ~PMR_DME; + env->pmr &=3D ~PMR_SME; env->tlb->cpu_openrisc_map_address_data =3D &cpu_openrisc_get_phys_nom= mu; env->tlb->cpu_openrisc_map_address_code =3D &cpu_openrisc_get_phys_nom= mu; env->lock_addr =3D -1; diff --git a/target/openrisc/machine.c b/target/openrisc/machine.c index a82be62..a20cce7 100644 --- a/target/openrisc/machine.c +++ b/target/openrisc/machine.c @@ -138,6 +138,7 @@ static const VMStateDescription vmstate_env =3D { VMSTATE_UINT32(dmmucfgr, CPUOpenRISCState), VMSTATE_UINT32(immucfgr, CPUOpenRISCState), VMSTATE_UINT32(evbar, CPUOpenRISCState), + VMSTATE_UINT32(pmr, CPUOpenRISCState), VMSTATE_UINT32(esr, CPUOpenRISCState), VMSTATE_UINT32(fpcsr, CPUOpenRISCState), VMSTATE_UINT64(mac, CPUOpenRISCState), diff --git a/target/openrisc/sys_helper.c b/target/openrisc/sys_helper.c index fa3d6a4..abdef5d 100644 --- a/target/openrisc/sys_helper.c +++ b/target/openrisc/sys_helper.c @@ -22,6 +22,7 @@ #include "cpu.h" #include "exec/exec-all.h" #include "exec/helper-proto.h" +#include "exception.h" =20 #define TO_SPR(group, number) (((group) << 11) + (number)) =20 @@ -141,6 +142,15 @@ void HELPER(mtspr)(CPUOpenRISCState *env, case TO_SPR(5, 2): /* MACHI */ env->mac =3D deposit64(env->mac, 32, 32, rb); break; + case TO_SPR(8, 0): /* PMR */ + env->pmr =3D rb; + if (env->pmr & PMR_DME || env->pmr & PMR_SME) { + cpu_restore_state(cs, GETPC()); + env->pc +=3D 4; + cs->halted =3D 1; + raise_exception(cpu, EXCP_HALTED); + } + break; case TO_SPR(9, 0): /* PICMR */ env->picmr |=3D rb; break; @@ -287,6 +297,9 @@ target_ulong HELPER(mfspr)(CPUOpenRISCState *env, return env->mac >> 32; break; =20 + case TO_SPR(8, 0): /* PMR */ + return env->pmr; + case TO_SPR(9, 0): /* PICMR */ return env->picmr; =20 --=20 2.9.3