From patchwork Mon Aug 19 04:28:28 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Deepthi Dharwar X-Patchwork-Id: 268084 Return-Path: X-Original-To: patchwork-incoming@ozlabs.org Delivered-To: patchwork-incoming@ozlabs.org Received: from ozlabs.org (localhost [IPv6:::1]) by ozlabs.org (Postfix) with ESMTP id CF3A12C097F for ; Mon, 19 Aug 2013 14:31:26 +1000 (EST) Received: from e23smtp03.au.ibm.com (e23smtp03.au.ibm.com [202.81.31.145]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client CN "e23smtp03.au.ibm.com", Issuer "GeoTrust SSL CA" (not verified)) by ozlabs.org (Postfix) with ESMTPS id D670F2C036C for ; Mon, 19 Aug 2013 14:29:09 +1000 (EST) Received: from /spool/local by e23smtp03.au.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! 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Violators will be prosecuted; Mon, 19 Aug 2013 14:18:09 +1000 Received: from d23relay03.au.ibm.com (d23relay03.au.ibm.com [9.190.235.21]) by d23dlp03.au.ibm.com (Postfix) with ESMTP id C546B3578052 for ; Mon, 19 Aug 2013 14:29:06 +1000 (EST) Received: from d23av04.au.ibm.com (d23av04.au.ibm.com [9.190.235.139]) by d23relay03.au.ibm.com (8.13.8/8.13.8/NCO v10.0) with ESMTP id r7J4Stgp8454414 for ; Mon, 19 Aug 2013 14:28:55 +1000 Received: from d23av04.au.ibm.com (loopback [127.0.0.1]) by d23av04.au.ibm.com (8.14.4/8.13.1/NCO v10.0 AVout) with ESMTP id r7J4T5qa018319 for ; Mon, 19 Aug 2013 14:29:06 +1000 Received: from deepthi.in.ibm.com (deepthi.in.ibm.com [9.124.35.236]) by d23av04.au.ibm.com (8.14.4/8.13.1/NCO v10.0 AVin) with ESMTP id r7J4T3tY018282; Mon, 19 Aug 2013 14:29:03 +1000 Subject: [RFC PATCH V3 4/5] powerpc/cpuidle: Enable powernv cpuidle support. To: benh@kernel.crashing.org, daniel.lezcano@linaro.org, kernel@vger.kernel.org, scottwood@freescale.com, linux-pm@lists.linux-foundation.org, linuxppc-dev@lists.ozlabs.org From: Deepthi Dharwar Date: Mon, 19 Aug 2013 09:58:28 +0530 Message-ID: <20130819042827.8609.35239.stgit@deepthi.in.ibm.com> In-Reply-To: <20130819042736.8609.17890.stgit@deepthi.in.ibm.com> References: <20130819042736.8609.17890.stgit@deepthi.in.ibm.com> User-Agent: StGit/0.16 MIME-Version: 1.0 X-Content-Scanned: Fidelis XPS MAILER x-cbid: 13081904-6102-0000-0000-000004095A4C Cc: preeti@linux.vnet.ibm.com, dongsheng.wang@freescale.com X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.16rc2 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: linuxppc-dev-bounces+patchwork-incoming=ozlabs.org@lists.ozlabs.org Sender: "Linuxppc-dev" The following patch extends the current powerpc backend idle driver to the powernv platform. Signed-off-by: Deepthi Dharwar --- drivers/cpuidle/cpuidle-powerpc.c | 36 +++++++++++++++++++++++++++++++++--- 1 file changed, 33 insertions(+), 3 deletions(-) diff --git a/drivers/cpuidle/cpuidle-powerpc.c b/drivers/cpuidle/cpuidle-powerpc.c index 5756085..e1cf599 100644 --- a/drivers/cpuidle/cpuidle-powerpc.c +++ b/drivers/cpuidle/cpuidle-powerpc.c @@ -53,7 +53,9 @@ static int snooze_loop(struct cpuidle_device *dev, { unsigned long in_purr; - idle_loop_prolog(&in_purr); + if (firmware_has_feature(FW_FEATURE_SPLPAR)) + idle_loop_prolog(&in_purr); + local_irq_enable(); set_thread_flag(TIF_POLLING_NRFLAG); @@ -67,7 +69,8 @@ static int snooze_loop(struct cpuidle_device *dev, clear_thread_flag(TIF_POLLING_NRFLAG); smp_mb(); - idle_loop_epilog(in_purr); + if (firmware_has_feature(FW_FEATURE_SPLPAR)) + idle_loop_epilog(in_purr); return index; } @@ -130,6 +133,15 @@ static int shared_cede_loop(struct cpuidle_device *dev, return index; } +static int nap_loop(struct cpuidle_device *dev, + struct cpuidle_driver *drv, + int index) +{ + ppc64_runlatch_off(); + power7_idle(); + return index; +} + /* * States for dedicated partition case. */ @@ -163,6 +175,23 @@ static struct cpuidle_state shared_states[MAX_IDLE_STATE_COUNT] = { .enter = &shared_cede_loop }, }; +static struct cpuidle_state powernv_states[MAX_IDLE_STATE_COUNT] = { + { /* Snooze */ + .name = "snooze", + .desc = "snooze", + .flags = CPUIDLE_FLAG_TIME_VALID, + .exit_latency = 0, + .target_residency = 0, + .enter = &snooze_loop }, + { /* NAP */ + .name = "NAP", + .desc = "NAP", + .flags = CPUIDLE_FLAG_TIME_VALID, + .exit_latency = 10, + .target_residency = 100, + .enter = &nap_loop }, +}; + void update_smt_snooze_delay(int cpu, int residency) { struct cpuidle_driver *drv = cpuidle_get_driver(); @@ -282,7 +311,6 @@ static int powerpc_idle_devices_init(void) return -EIO; } } - return 0; } @@ -309,6 +337,8 @@ static int powerpc_idle_probe(void) cpuidle_state_table = shared_states; else if (get_lppaca_is_shared_proc() == 0) cpuidle_state_table = dedicated_states; + } else if (firmware_has_feature(FW_FEATURE_OPALv3)) { + cpuidle_state_table = powernv_states; } else return -ENODEV;