Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755781Ab1CVMdh (ORCPT ); Tue, 22 Mar 2011 08:33:37 -0400 Received: from e23smtp08.au.ibm.com ([202.81.31.141]:42607 "EHLO e23smtp08.au.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755917Ab1CVMde (ORCPT ); Tue, 22 Mar 2011 08:33:34 -0400 From: Trinabh Gupta Subject: [RFC PATCH V4 4/5] cpuidle: driver for xen To: arjan@linux.intel.com, peterz@infradead.org, lenb@kernel.org, suresh.b.siddha@intel.com, benh@kernel.crashing.org, venki@google.com, ak@linux.intel.com Cc: linux-kernel@vger.kernel.org, sfr@canb.auug.org.au Date: Tue, 22 Mar 2011 18:03:28 +0530 Message-ID: <20110322123324.28725.3131.stgit@tringupt.in.ibm.com> In-Reply-To: <20110322123208.28725.30945.stgit@tringupt.in.ibm.com> References: <20110322123208.28725.30945.stgit@tringupt.in.ibm.com> User-Agent: StGIT/0.14.3 MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2069 Lines: 84 This patch implements a default cpuidle driver for xen. Earlier pm_idle was flipped to default_idle. Maybe there is a better way to ensure default_idle is called without using this cpuidle driver. Signed-off-by: Trinabh Gupta --- arch/x86/xen/setup.c | 42 +++++++++++++++++++++++++++++++++++++++++- 1 files changed, 41 insertions(+), 1 deletions(-) diff --git a/arch/x86/xen/setup.c b/arch/x86/xen/setup.c index a8a66a5..4fce4cd 100644 --- a/arch/x86/xen/setup.c +++ b/arch/x86/xen/setup.c @@ -9,6 +9,8 @@ #include #include #include +#include +#include #include #include @@ -321,6 +323,44 @@ void __cpuinit xen_enable_syscall(void) #endif /* CONFIG_X86_64 */ } +static struct cpuidle_driver xen_idle_driver = { + .name = "xen_idle", + .owner = THIS_MODULE, + .priority = 1, +}; + +extern struct cpuidle_state state_default_state; + +static int setup_cpuidle(int cpu) +{ + struct cpuidle_device *dev = kzalloc(sizeof(struct cpuidle_device), + GFP_KERNEL); + int count = CPUIDLE_DRIVER_STATE_START; + dev->cpu = cpu; + dev->drv = &xen_idle_driver; + + dev->states[count] = state_default_idle; + count++; + + dev->state_count = count; + + if (cpuidle_register_device(dev)) + return -EIO; + return 0; +} + +static int xen_idle_init(void) +{ + int retval, i; + retval = cpuidle_register_driver(&xen_idle_driver); + + for_each_online_cpu(i) { + setup_cpuidle(i); + } + + return 0; +} + void __init xen_arch_setup(void) { xen_panic_handler_init(); @@ -354,7 +394,7 @@ void __init xen_arch_setup(void) #ifdef CONFIG_X86_32 boot_cpu_data.hlt_works_ok = 1; #endif - pm_idle = default_idle; + xen_idle_init(); boot_option_idle_override = IDLE_HALT; fiddle_vdso(); -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/