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[59.124.168.89]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-20515542498sm2056065ad.188.2024.08.28.20.39.33 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 28 Aug 2024 20:39:35 -0700 (PDT) From: Nick Hu To: greentime.hu@sifive.com, zong.li@sifive.com, "Rafael J. Wysocki" , Pavel Machek , Paul Walmsley , Palmer Dabbelt , Albert Ou , Daniel Lezcano , Thomas Gleixner , Andrew Jones , Conor Dooley , Samuel Holland , Sunil V L , Nick Hu , linux-pm@vger.kernel.org, linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org Subject: [PATCH 1/2] riscv: Add stimecmp save and restore Date: Thu, 29 Aug 2024 11:38:59 +0800 Message-Id: <20240829033904.477200-2-nick.hu@sifive.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240829033904.477200-1-nick.hu@sifive.com> References: <20240829033904.477200-1-nick.hu@sifive.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" If the HW support the SSTC extension, we should save and restore the stimecmp register while cpu non retention suspend. Signed-off-by: Nick Hu --- arch/riscv/include/asm/suspend.h | 4 ++++ arch/riscv/kernel/suspend.c | 13 +++++++++++++ 2 files changed, 17 insertions(+) diff --git a/arch/riscv/include/asm/suspend.h b/arch/riscv/include/asm/susp= end.h index 4ffb022b097f..ffaac2efabb5 100644 --- a/arch/riscv/include/asm/suspend.h +++ b/arch/riscv/include/asm/suspend.h @@ -16,6 +16,10 @@ struct suspend_context { unsigned long envcfg; unsigned long tvec; unsigned long ie; +#if __riscv_xlen < 64 + unsigned long stimecmph; +#endif + unsigned long stimecmp; #ifdef CONFIG_MMU unsigned long satp; #endif diff --git a/arch/riscv/kernel/suspend.c b/arch/riscv/kernel/suspend.c index c8cec0cc5833..3afd86e1abf7 100644 --- a/arch/riscv/kernel/suspend.c +++ b/arch/riscv/kernel/suspend.c @@ -19,6 +19,12 @@ void suspend_save_csrs(struct suspend_context *context) context->tvec =3D csr_read(CSR_TVEC); context->ie =3D csr_read(CSR_IE); =20 + if (riscv_has_extension_unlikely(RISCV_ISA_EXT_SSTC)) { + context->stimecmp =3D csr_read(CSR_STIMECMP); +#if __riscv_xlen < 64 + context->stimecmph =3D csr_read(CSR_STIMECMPH); +#endif + } /* * No need to save/restore IP CSR (i.e. MIP or SIP) because: * @@ -42,6 +48,13 @@ void suspend_restore_csrs(struct suspend_context *contex= t) csr_write(CSR_TVEC, context->tvec); csr_write(CSR_IE, context->ie); =20 + if (riscv_has_extension_unlikely(RISCV_ISA_EXT_SSTC)) { + csr_write(CSR_STIMECMP, context->stimecmp); +#if __riscv_xlen < 64 + csr_write(CSR_STIMECMPH, context->stimecmph); +#endif + } + #ifdef CONFIG_MMU csr_write(CSR_SATP, context->satp); #endif --=20 2.34.1 From nobody Thu Dec 18 23:41:21 2025 Received: from mail-pf1-f177.google.com (mail-pf1-f177.google.com [209.85.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 53F6D61FD7 for ; Thu, 29 Aug 2024 03:39:44 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.177 ARC-Seal: i=1; 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[59.124.168.89]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-20515542498sm2056065ad.188.2024.08.28.20.39.40 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 28 Aug 2024 20:39:43 -0700 (PDT) From: Nick Hu To: greentime.hu@sifive.com, zong.li@sifive.com, "Rafael J. Wysocki" , Pavel Machek , Paul Walmsley , Palmer Dabbelt , Albert Ou , Daniel Lezcano , Thomas Gleixner , Andrew Jones , Conor Dooley , Samuel Holland , Nick Hu , Sunil V L , linux-pm@vger.kernel.org, linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org Subject: [PATCH 2/2] time-riscv: Stop stimecmp when cpu hotplug Date: Thu, 29 Aug 2024 11:39:00 +0800 Message-Id: <20240829033904.477200-3-nick.hu@sifive.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240829033904.477200-1-nick.hu@sifive.com> References: <20240829033904.477200-1-nick.hu@sifive.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Stop the stimecmp when the cpu is going to be off otherwise the timer interrupt may pending while performing power down operation. Signed-off-by: Nick Hu --- drivers/clocksource/timer-riscv.c | 22 +++++++++++++++------- 1 file changed, 15 insertions(+), 7 deletions(-) diff --git a/drivers/clocksource/timer-riscv.c b/drivers/clocksource/timer-= riscv.c index 48ce50c5f5e6..9a6acaa8dfb0 100644 --- a/drivers/clocksource/timer-riscv.c +++ b/drivers/clocksource/timer-riscv.c @@ -32,15 +32,19 @@ static DEFINE_STATIC_KEY_FALSE(riscv_sstc_available); static bool riscv_timer_cannot_wake_cpu; =20 +static void riscv_clock_stop_stimecmp(void) +{ + csr_write(CSR_STIMECMP, ULONG_MAX); + if (IS_ENABLED(CONFIG_32BIT)) + csr_write(CSR_STIMECMPH, ULONG_MAX); +} + static void riscv_clock_event_stop(void) { - if (static_branch_likely(&riscv_sstc_available)) { - csr_write(CSR_STIMECMP, ULONG_MAX); - if (IS_ENABLED(CONFIG_32BIT)) - csr_write(CSR_STIMECMPH, ULONG_MAX); - } else { + if (static_branch_likely(&riscv_sstc_available)) + riscv_clock_stop_stimecmp(); + else sbi_set_timer(U64_MAX); - } } =20 static int riscv_clock_next_event(unsigned long delta, @@ -126,7 +130,11 @@ static int riscv_timer_starting_cpu(unsigned int cpu) =20 static int riscv_timer_dying_cpu(unsigned int cpu) { - disable_percpu_irq(riscv_clock_event_irq); + if (static_branch_likely(&riscv_sstc_available)) + riscv_clock_stop_stimecmp(); + else + disable_percpu_irq(riscv_clock_event_irq); + return 0; } =20 --=20 2.34.1