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Date: Mon, 11 May 2020 21:48:36 +0100 Message-Id: <20200511204836.27870-3-mike.leach@linaro.org> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200511204836.27870-1-mike.leach@linaro.org> References: <20200511204836.27870-1-mike.leach@linaro.org> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200511_134844_646965_A7C460FF X-CRM114-Status: GOOD ( 14.73 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: tglx@linutronix.de, Mike Leach , suzuki.poulose@arm.com MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org Adds a notify callback for CPU PM events to the CTI driver - for CPU bound CTI devices. Signed-off-by: Mike Leach --- drivers/hwtracing/coresight/coresight-cti.c | 69 +++++++++++++++++++++ 1 file changed, 69 insertions(+) diff --git a/drivers/hwtracing/coresight/coresight-cti.c b/drivers/hwtracing/coresight/coresight-cti.c index 716cd5a45d12..5886663a641d 100644 --- a/drivers/hwtracing/coresight/coresight-cti.c +++ b/drivers/hwtracing/coresight/coresight-cti.c @@ -8,6 +8,7 @@ #include #include #include +#include #include #include #include @@ -655,6 +656,70 @@ static void cti_remove_conn_xrefs(struct cti_drvdata *drvdata) } } +/** cti PM callbacks **/ +static int cti_cpu_pm_notify(struct notifier_block *nb, unsigned long cmd, + void *v) +{ + struct cti_drvdata *drvdata; + unsigned int cpu = smp_processor_id(); + int notify_res = NOTIFY_OK; + + if (!cti_cpu_drvdata[cpu]) + return NOTIFY_OK; + + drvdata = cti_cpu_drvdata[cpu]; + + if (WARN_ON_ONCE(drvdata->ctidev.cpu != cpu)) + return NOTIFY_BAD; + + spin_lock(&drvdata->spinlock); + + switch (cmd) { + case CPU_PM_ENTER: + /* CTI regs all static - we have a copy & nothing to save */ + drvdata->config.hw_powered = false; + if (drvdata->config.hw_enabled) + coresight_disclaim_device(drvdata->base); + break; + + case CPU_PM_ENTER_FAILED: + drvdata->config.hw_powered = true; + if (drvdata->config.hw_enabled) { + if (coresight_claim_device(drvdata->base)) + drvdata->config.hw_enabled = false; + } + break; + + case CPU_PM_EXIT: + /* write hardware registers to re-enable. */ + drvdata->config.hw_powered = true; + drvdata->config.hw_enabled = false; + + /* check enable reference count to enable HW */ + if (atomic_read(&drvdata->config.enable_req_count)) { + /* check we can claim the device as we re-power */ + if (coresight_claim_device(drvdata->base)) + goto cti_notify_exit; + + drvdata->config.hw_enabled = true; + cti_write_all_hw_regs(drvdata); + } + break; + + default: + notify_res = NOTIFY_DONE; + break; + } + +cti_notify_exit: + spin_unlock(&drvdata->spinlock); + return notify_res; +} + +static struct notifier_block cti_cpu_pm_nb = { + .notifier_call = cti_cpu_pm_notify, +}; + /* CPU HP handlers */ static int cti_starting_cpu(unsigned int cpu) { @@ -686,6 +751,8 @@ static void cti_pm_release(struct cti_drvdata *drvdata) { if (drvdata->ctidev.cpu >= 0) { if (--nr_cti_cpu == 0) { + cpu_pm_unregister_notifier(&cti_cpu_pm_nb); + cpuhp_remove_state_nocalls( CPUHP_AP_ARM_CORESIGHT_CTI_STARTING); } @@ -814,6 +881,8 @@ static int cti_probe(struct amba_device *adev, const struct amba_id *id) "arm/coresight_cti:starting", cti_starting_cpu, cti_dying_cpu); + if (!ret) + ret = cpu_pm_register_notifier(&cti_cpu_pm_nb); cpus_read_unlock(); if (ret) goto err_out; -- 2.17.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel