From owner-svn-src-stable-9@FreeBSD.ORG Sun Dec 23 12:07:43 2012 Return-Path: Delivered-To: svn-src-stable-9@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52]) by hub.freebsd.org (Postfix) with ESMTP id 1782D310; Sun, 23 Dec 2012 12:07:43 +0000 (UTC) (envelope-from avg@FreeBSD.org) Received: from svn.freebsd.org (svn.freebsd.org [IPv6:2001:1900:2254:2068::e6a:0]) by mx1.freebsd.org (Postfix) with ESMTP id D6B5A8FC0A; Sun, 23 Dec 2012 12:07:42 +0000 (UTC) Received: from svn.freebsd.org (localhost [127.0.0.1]) by svn.freebsd.org (8.14.5/8.14.5) with ESMTP id qBNC7gRO088772; Sun, 23 Dec 2012 12:07:42 GMT (envelope-from avg@svn.freebsd.org) Received: (from avg@localhost) by svn.freebsd.org (8.14.5/8.14.5/Submit) id qBNC7gAB088771; Sun, 23 Dec 2012 12:07:42 GMT (envelope-from avg@svn.freebsd.org) Message-Id: <201212231207.qBNC7gAB088771@svn.freebsd.org> From: Andriy Gapon Date: Sun, 23 Dec 2012 12:07:42 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-9@freebsd.org Subject: svn commit: r244616 - stable/9/sys/dev/acpica X-SVN-Group: stable-9 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: svn-src-stable-9@freebsd.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: SVN commit messages for only the 9-stable src tree List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 23 Dec 2012 12:07:43 -0000 Author: avg Date: Sun Dec 23 12:07:42 2012 New Revision: 244616 URL: http://svnweb.freebsd.org/changeset/base/244616 Log: MFC r243761: acpi_cpu_notify: disable acpi_cpu_idle while updating C-state data Modified: stable/9/sys/dev/acpica/acpi_cpu.c Directory Properties: stable/9/sys/ (props changed) stable/9/sys/dev/ (props changed) Modified: stable/9/sys/dev/acpica/acpi_cpu.c ============================================================================== --- stable/9/sys/dev/acpica/acpi_cpu.c Sun Dec 23 12:06:12 2012 (r244615) +++ stable/9/sys/dev/acpica/acpi_cpu.c Sun Dec 23 12:07:42 2012 (r244616) @@ -973,9 +973,9 @@ acpi_cpu_idle() return; } - /* If disabled, return immediately. */ + /* If disabled, take the safe path. */ if (is_idle_disabled(sc)) { - ACPI_ENABLE_IRQS(); + acpi_cpu_c1(); return; } @@ -1081,23 +1081,31 @@ acpi_cpu_idle() /* * Re-evaluate the _CST object when we are notified that it changed. - * - * XXX Re-evaluation disabled until locking is done. */ static void acpi_cpu_notify(ACPI_HANDLE h, UINT32 notify, void *context) { struct acpi_cpu_softc *sc = (struct acpi_cpu_softc *)context; - + if (notify != ACPI_NOTIFY_CX_STATES) return; + /* + * C-state data for target CPU is going to be in flux while we execute + * acpi_cpu_cx_cst, so disable entering acpi_cpu_idle. + * Also, it may happen that multiple ACPI taskqueues may concurrently + * execute notifications for the same CPU. ACPI_SERIAL is used to + * protect against that. + */ + ACPI_SERIAL_BEGIN(cpu); + disable_idle(sc); + /* Update the list of Cx states. */ acpi_cpu_cx_cst(sc); acpi_cpu_cx_list(sc); - - ACPI_SERIAL_BEGIN(cpu); acpi_cpu_set_cx_lowest(sc); + + enable_idle(sc); ACPI_SERIAL_END(cpu); acpi_UserNotify("PROCESSOR", sc->cpu_handle, notify);