From patchwork Wed Jan 31 16:50:38 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Russell King \(Oracle\)" X-Patchwork-Id: 768875 Received: from pandora.armlinux.org.uk (pandora.armlinux.org.uk [78.32.30.218]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 2D37212BEBF; Wed, 31 Jan 2024 16:50:52 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=78.32.30.218 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1706719853; cv=none; b=JXl6Wfv0fKZzK6bFEzBrzXwD5ZpbWdBEJdHsUeCcVwJglRD0Ok4WlijIX5R+X0yeUM72+APD+5CFuG81N+MADMziwq8wcEbT1ijGTuFa+gq4iQlvq/qGEqzHFh4m3du5oODmIoplb0lywZ94oVecG7IDB0Zh/rg5EQsZ3jh2zCA= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1706719853; c=relaxed/simple; bh=P8UMP2I/3nZNlJyCrd8eERvIK1OiBSscwtDfKF/3DxE=; h=In-Reply-To:References:From:To:Cc:Subject:MIME-Version: Content-Disposition:Content-Type:Message-Id:Date; b=crJM5k3oe4GGYDEx+YyUkXpgJWSKxOwUORea0d5fs9DTk6Bz4OJlWbCG0lgLCjMCZ9XfeGQ7UoAa4HG1HQJ1Ma+GO0bKQ0sZc9TsNOlpvyF1v1zNplufMy/qKYz6kzIUBpySkBu7vV8hyFwwl5Y702n3Ff5XS4o+Yeqb/esi5hU= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=armlinux.org.uk; spf=none smtp.mailfrom=armlinux.org.uk; dkim=pass (2048-bit key) header.d=armlinux.org.uk header.i=@armlinux.org.uk header.b=uqc+DCKw; arc=none smtp.client-ip=78.32.30.218 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=armlinux.org.uk Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=armlinux.org.uk Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=armlinux.org.uk header.i=@armlinux.org.uk header.b="uqc+DCKw" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=armlinux.org.uk; s=pandora-2019; h=Date:Sender:Message-Id:Content-Type: Content-Transfer-Encoding:MIME-Version:Subject:Cc:To:From:References: In-Reply-To:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id:List-Help: List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=DnAkVWZfHdsfbPL7YZp73DdgOlGRvTL1dby6CU3CDrY=; b=uqc+DCKwG0ug+HapGtea8aoa5Y g5EpcUoEzakHsQIsGgONCg7oIGC58rfToOozcFpjkAtAypAyfVF6fnnKgmvWj1DD2sxBspC6E4cHX SSOa+qh6GVlBlisWfGKmtDac31tVsXttXF8jhZdqTIICwhAhlJbeSeb2bsTj3GlEuH4lquy25qowh qE5bnPbzW5WKHaXBCE7AxlRmjJ5l1MQNXQtzwAGI2Ys1ulpvisOs2/egpL8YFDP4mHKVzHjGfq1D0 Qg7QH6oXlz1qOITAOO7AoN4aWjtI84rCd5gwtLz7YiKyArVIPBSPvrq3HXqSm/sQKSb30L71/nt+H +wF0Ir0g==; Received: from e0022681537dd.dyn.armlinux.org.uk ([fd8f:7570:feb6:1:222:68ff:fe15:37dd]:36100 helo=rmk-PC.armlinux.org.uk) by pandora.armlinux.org.uk with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.96) (envelope-from ) id 1rVDnM-0003W7-34; Wed, 31 Jan 2024 16:50:41 +0000 Received: from rmk by rmk-PC.armlinux.org.uk with local (Exim 4.94.2) (envelope-from ) id 1rVDnK-0027ZN-40; Wed, 31 Jan 2024 16:50:38 +0000 In-Reply-To: References: From: Russell King (Oracle) To: linux-pm@vger.kernel.org, loongarch@lists.linux.dev, linux-acpi@vger.kernel.org, linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-riscv@lists.infradead.org, kvmarm@lists.linux.dev, x86@kernel.org, acpica-devel@lists.linuxfoundation.org, linux-csky@vger.kernel.org, linux-doc@vger.kernel.org, linux-ia64@vger.kernel.org, linux-parisc@vger.kernel.org Cc: Salil Mehta , Jean-Philippe Brucker , jianyong.wu@arm.com, justin.he@arm.com, James Morse , Jonathan Cameron , "Rafael J. Wysocki" Subject: [PATCH RFC v4 12/15] arm64: psci: Ignore DENIED CPUs Precedence: bulk X-Mailing-List: linux-acpi@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Disposition: inline Message-Id: Sender: Russell King Date: Wed, 31 Jan 2024 16:50:38 +0000 From: Jean-Philippe Brucker When a CPU is marked as disabled, but online capable in the MADT, PSCI applies some firmware policy to control when it can be brought online. PSCI returns DENIED to a CPU_ON request if this is not currently permitted. The OS can learn the current policy from the _STA enabled bit. Handle the PSCI DENIED return code gracefully instead of printing an error. See https://developer.arm.com/documentation/den0022/f/?lang=en page 58. Signed-off-by: Jean-Philippe Brucker [ morse: Rewrote commit message ] Signed-off-by: James Morse Tested-by: Miguel Luis Tested-by: Vishnu Pajjuri Tested-by: Jianyong Wu Reviewed-by: Jonathan Cameron Signed-off-by: Russell King (Oracle) --- Changes since RFC v2 * Add specification reference * Use EPERM rather than EPROBE_DEFER Changes since RFC v3: * Use EPERM everywhere * Drop unnecessary changes to drivers/firmware/psci/psci.c --- arch/arm64/kernel/psci.c | 2 +- arch/arm64/kernel/smp.c | 3 ++- 2 files changed, 3 insertions(+), 2 deletions(-) diff --git a/arch/arm64/kernel/psci.c b/arch/arm64/kernel/psci.c index 29a8e444db83..fabd732d0a2d 100644 --- a/arch/arm64/kernel/psci.c +++ b/arch/arm64/kernel/psci.c @@ -40,7 +40,7 @@ static int cpu_psci_cpu_boot(unsigned int cpu) { phys_addr_t pa_secondary_entry = __pa_symbol(secondary_entry); int err = psci_ops.cpu_on(cpu_logical_map(cpu), pa_secondary_entry); - if (err) + if (err && err != -EPERM) pr_err("failed to boot CPU%d (%d)\n", cpu, err); return err; diff --git a/arch/arm64/kernel/smp.c b/arch/arm64/kernel/smp.c index 4ced34f62dab..dc0e0b3ec2d4 100644 --- a/arch/arm64/kernel/smp.c +++ b/arch/arm64/kernel/smp.c @@ -132,7 +132,8 @@ int __cpu_up(unsigned int cpu, struct task_struct *idle) /* Now bring the CPU into our world */ ret = boot_secondary(cpu, idle); if (ret) { - pr_err("CPU%u: failed to boot: %d\n", cpu, ret); + if (ret != -EPERM) + pr_err("CPU%u: failed to boot: %d\n", cpu, ret); return ret; }