From mboxrd@z Thu Jan 1 00:00:00 1970 From: Peter Zijlstra Subject: [PATCH v2 15/44] acpi_idle: Remove tracing Date: Mon, 19 Sep 2022 11:59:54 +0200 Message-ID: <20220919101521.340781451@infradead.org> References: <20220919095939.761690562@infradead.org> Mime-Version: 1.0 Return-path: DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=Content-Type:MIME-Version:References: Subject:Cc:To:From:Date:Message-ID:Sender:Reply-To:Content-Transfer-Encoding: Content-ID:Content-Description:In-Reply-To; bh=2qey3zLroBQku0zom/Uqdc2w/ejv7qE6fMvFqUVfz0c=; b=RlUJ2AwCdpPblbfQP0YMvc7OXS vypLks6wgtcgloMSsvVlfS4RXNb3cZ0pXhJNi4ixKXVkWOTr0JWkhccmDyvtgo89daT6S3vWq6fz5 VJzntwGG+I/tKhwN1gXnU10VZf6Y2oBh+TZtCcBfNHoWSvo7CdW+wkU/J6FYAtOuMh9cU+iZfzo32 ueJIGOFL/qwA0/Lhvytsoucamxio8Km/dW5jH6jiWy13xWNatkE4MBjgvPPYAw+ddArxtKXq3YvaG gF3XSzXuFVmf4E8UBdDETDVhHmKRxQcPulKjX3yVJj2EwPrVOE6EJWXDWrwQYGJN3PgMWDcDgEXt3 DLPFGGag==; List-ID: Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: peterz@infradead.org Cc: richard.henderson@linaro.org, ink@jurassic.park.msu.ru, mattst88@gmail.com, vgupta@kernel.org, linux@armlinux.org.uk, ulli.kroll@googlemail.com, linus.walleij@linaro.org, shawnguo@kernel.org, Sascha Hauer , kernel@pengutronix.de, festevam@gmail.com, linux-imx@nxp.com, tony@atomide.com, khilman@kernel.org, catalin.marinas@arm.com, will@kernel.org, guoren@kernel.org, bcain@quicinc.com, chenhuacai@kernel.org, kernel@xen0n.name, geert@linux-m68k.org, sammy@sammy.net, monstr@monstr.eu, tsbogend@alpha.franken.de, dinguyen@kernel.org, jonas@southpole.se, stefan.kristiansson@saunalahti.fi, shorne@gmail.com, James.Bottomley@HansenPartnership.com, deller@gmx.de, mpe@ellerman.id.au, npiggin@gmail.com, christophe.leroy@csgroup.eu, paul.walmsley@sifive.com, palmer@dabbel All the idle routines are called with RCU disabled, as such there must not be any tracing inside. While there; clean-up the io-port idle thing. Signed-off-by: Peter Zijlstra (Intel) --- drivers/acpi/processor_idle.c | 24 +++++++++++++----------- 1 file changed, 13 insertions(+), 11 deletions(-) --- a/drivers/acpi/processor_idle.c +++ b/drivers/acpi/processor_idle.c @@ -108,8 +108,8 @@ static const struct dmi_system_id proces static void __cpuidle acpi_safe_halt(void) { if (!tif_need_resched()) { - safe_halt(); - local_irq_disable(); + raw_safe_halt(); + raw_local_irq_disable(); } } @@ -524,16 +524,21 @@ static int acpi_idle_bm_check(void) return bm_status; } -static void wait_for_freeze(void) +static __cpuidle void io_idle(unsigned long addr) { + /* IO port based C-state */ + inb(addr); + #ifdef CONFIG_X86 /* No delay is needed if we are in guest */ if (boot_cpu_has(X86_FEATURE_HYPERVISOR)) return; #endif - /* Dummy wait op - must do something useless after P_LVL2 read - because chipsets cannot guarantee that STPCLK# signal - gets asserted in time to freeze execution properly. */ + /* + * Dummy wait op - must do something useless after P_LVL2 read + * because chipsets cannot guarantee that STPCLK# signal + * gets asserted in time to freeze execution properly. + */ inl(acpi_gbl_FADT.xpm_timer_block.address); } @@ -553,9 +558,7 @@ static void __cpuidle acpi_idle_do_entry } else if (cx->entry_method == ACPI_CSTATE_HALT) { acpi_safe_halt(); } else { - /* IO port based C-state */ - inb(cx->address); - wait_for_freeze(); + io_idle(cx->address); } perf_lopwr_cb(false); @@ -577,8 +580,7 @@ static int acpi_idle_play_dead(struct cp if (cx->entry_method == ACPI_CSTATE_HALT) safe_halt(); else if (cx->entry_method == ACPI_CSTATE_SYSTEMIO) { - inb(cx->address); - wait_for_freeze(); + io_idle(cx->address); } else return -ENODEV;