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To: benh@kernel.crashing.org, daniel.lezcano@linaro.org, linux-kernel@vger.kernel.org, scottwood@freescale.com, linux-pm@lists.linux-foundation.org, linuxppc-dev@lists.ozlabs.org From: Deepthi Dharwar Date: Thu, 22 Aug 2013 15:24:25 +0530 Message-ID: <20130822095422.27416.94236.stgit@deepthi.in.ibm.com> In-Reply-To: <20130822095323.27416.79369.stgit@deepthi.in.ibm.com> References: <20130822095323.27416.79369.stgit@deepthi.in.ibm.com> User-Agent: StGit/0.16 MIME-Version: 1.0 X-TM-AS-MML: No X-Content-Scanned: Fidelis XPS MAILER x-cbid: 13082209-5816-0000-0000-000009883E87 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 power backend idle driver to the powernv platform. Signed-off-by: Deepthi Dharwar --- drivers/cpuidle/cpuidle-ibm-power.c | 37 ++++++++++++++++++++++++++++++++--- 1 file changed, 34 insertions(+), 3 deletions(-) diff --git a/drivers/cpuidle/cpuidle-ibm-power.c b/drivers/cpuidle/cpuidle-ibm-power.c index 4ee5a94..de5e837 100644 --- a/drivers/cpuidle/cpuidle-ibm-power.c +++ b/drivers/cpuidle/cpuidle-ibm-power.c @@ -50,9 +50,11 @@ static int snooze_loop(struct cpuidle_device *dev, struct cpuidle_driver *drv, int index) { - unsigned long in_purr; + unsigned long in_purr = 0; + + if (firmware_has_feature(FW_FEATURE_SPLPAR)) + idle_loop_prolog(&in_purr); - idle_loop_prolog(&in_purr); local_irq_enable(); set_thread_flag(TIF_POLLING_NRFLAG); @@ -66,7 +68,8 @@ 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; } @@ -129,6 +132,15 @@ 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. */ @@ -162,6 +174,23 @@ 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(); @@ -261,6 +290,8 @@ static int power_idle_probe(void) cpuidle_state_table = shared_states; else cpuidle_state_table = dedicated_states; + } else if (firmware_has_feature(FW_FEATURE_OPALv3)) { + cpuidle_state_table = powernv_states; } else return -ENODEV;