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([111.48.69.247]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-7106ecdfe2dsm5031633b3a.114.2024.08.05.02.15.50 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 05 Aug 2024 02:15:54 -0700 (PDT) From: Xiong Xin To: rafael@kernel.org, len.brown@intel.com, pavel@ucw.cz, mario.limonciello@amd.com Cc: linux-pm@vger.kernel.org, Xiong Xin Subject: [PATCH v1] PM: sleep: Optimize the pm_debug_messages_should_print() condition Date: Mon, 5 Aug 2024 17:15:09 +0800 Message-Id: <20240805091509.91362-1-xiongxin@kylinos.cn> X-Mailer: git-send-email 2.34.1 Precedence: bulk X-Mailing-List: linux-pm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 pm_pr_dbg() is useful when debugging suspend and hibernate. commit cdb8c100d8a4 ("include/linux/suspend.h: Only show pm_pr_dbg messages at suspend/resume") using pm_suspend_target_state to limits the output range of pm_pr_dbg(), causes the original pm_pr_dbg() output range to change. In the suspend process, pm_pr_dbg() is called before setting pm_suspend_target_state. As a result, this part of the log cannot be output. pm_pr_dbg() also outputs debug logs for hibernate, but pm_suspend_target_state is not set, resulting in hibernate debug logs can only be output through dynamic debug, which is very inconvenient. Expand the scope of the state variable in state_store() and add judgment on it in pm_debug_messages_should_print() to extend the debugging output of pm_pr_dbg() to suspend and hibernate processes. Fixes: cdb8c100d8a4 ("include/linux/suspend.h: Only show pm_pr_dbg messages at suspend/resume"). Signed-off-by: Xiong Xin Reviewed-by: Mario Limonciello --- kernel/power/main.c | 21 +++++++++++++-------- 1 file changed, 13 insertions(+), 8 deletions(-) diff --git a/kernel/power/main.c b/kernel/power/main.c index a9e0693aaf69..a376107efbb4 100644 --- a/kernel/power/main.c +++ b/kernel/power/main.c @@ -559,6 +559,8 @@ late_initcall(pm_debugfs_init); #endif /* CONFIG_PM_SLEEP */ +static suspend_state_t pm_state = PM_SUSPEND_ON; + #ifdef CONFIG_PM_SLEEP_DEBUG /* * pm_print_times: print time taken by devices to suspend and resume. @@ -613,7 +615,9 @@ bool pm_debug_messages_on __read_mostly; bool pm_debug_messages_should_print(void) { - return pm_debug_messages_on && pm_suspend_target_state != PM_SUSPEND_ON; + return pm_debug_messages_on && + (pm_suspend_target_state != PM_SUSPEND_ON || + pm_state != PM_SUSPEND_ON); } EXPORT_SYMBOL_GPL(pm_debug_messages_should_print); @@ -715,7 +719,6 @@ static suspend_state_t decode_state(const char *buf, size_t n) static ssize_t state_store(struct kobject *kobj, struct kobj_attribute *attr, const char *buf, size_t n) { - suspend_state_t state; int error; error = pm_autosleep_lock(); @@ -727,18 +730,20 @@ static ssize_t state_store(struct kobject *kobj, struct kobj_attribute *attr, goto out; } - state = decode_state(buf, n); - if (state < PM_SUSPEND_MAX) { - if (state == PM_SUSPEND_MEM) - state = mem_sleep_current; + pm_state = decode_state(buf, n); + if (pm_state < PM_SUSPEND_MAX) { + if (pm_state == PM_SUSPEND_MEM) + pm_state = mem_sleep_current; - error = pm_suspend(state); - } else if (state == PM_SUSPEND_MAX) { + error = pm_suspend(pm_state); + } else if (pm_state == PM_SUSPEND_MAX) { error = hibernate(); } else { error = -EINVAL; } + pm_state = PM_SUSPEND_ON; + out: pm_autosleep_unlock(); return error ? error : n;