From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mga06.intel.com (mga06b.intel.com [134.134.136.31]) by gabe.freedesktop.org (Postfix) with ESMTPS id 32EE110E512 for ; Thu, 15 Jun 2023 14:57:36 +0000 (UTC) Message-ID: <998c3a8a-de9b-ce02-7623-c242c12dec29@intel.com> Date: Thu, 15 Jun 2023 19:50:18 +0530 Content-Language: en-US To: Anshuman Gupta , References: <20230615083216.1861288-1-anshuman.gupta@intel.com> <20230615083216.1861288-3-anshuman.gupta@intel.com> From: "Nilawar, Badal" In-Reply-To: <20230615083216.1861288-3-anshuman.gupta@intel.com> Content-Type: text/plain; charset="UTF-8"; format=flowed Content-Transfer-Encoding: 7bit MIME-Version: 1.0 Subject: Re: [igt-dev] [PATCH i-g-t 2/2] lib/igt_aux: Enable PM Suspend dbg messages List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: igt-dev-bounces@lists.freedesktop.org Sender: "igt-dev" List-ID: On 15-06-2023 14:02, Anshuman Gupta wrote: > Enabling PM Suspend dbg messages by turning on > /sys/power/pm_debug_messages switch also adding an > exit handler provision to restore the > pm_debug_messagesvstate. > > Signed-off-by: Anshuman Gupta > --- > lib/igt_aux.c | 25 +++++++++++++++++++++---- > 1 file changed, 21 insertions(+), 4 deletions(-) > > diff --git a/lib/igt_aux.c b/lib/igt_aux.c > index 425a1f911..87c3933a5 100644 > --- a/lib/igt_aux.c > +++ b/lib/igt_aux.c > @@ -695,6 +695,7 @@ void igt_print_activity(void) > > static int autoresume_delay; > bool __console_suspend_saved_state; > +bool __pm_debug_messages_state; > > #define SYSFS_MODULE_PRINTK "/sys/module/printk/parameters/" > #define CONSOLE_SUSPEND_DISABLE false > @@ -905,7 +906,7 @@ static bool is_mem_sleep_state_supported(int power_dir, enum igt_mem_sleep state > > static void igt_aux_pm_suspend_dbg_restore_exit_handler(int sig) > { > - int sysfs_fd; > + int sysfs_fd, power_dir; > > sysfs_fd = open(SYSFS_MODULE_PRINTK, O_RDONLY); > > @@ -913,10 +914,19 @@ static void igt_aux_pm_suspend_dbg_restore_exit_handler(int sig) > return; > > igt_sysfs_set_boolean(sysfs_fd, "console_suspend", __console_suspend_saved_state); Close sysfs_fd here to avoid return without closing it when opening power_dir fails. Regards, Badal> + power_dir = open("/sys/power", O_RDONLY); > + > + if (power_dir < 0) > + return; > + > + if (!faccessat(power_dir, "pm_debug_messages", R_OK | W_OK, 0)) > + igt_sysfs_set_boolean(power_dir, "pm_debug_messages", __pm_debug_messages_state); > + > close(sysfs_fd); > + close(power_dir); > } > > -static void igt_aux_enable_pm_suspend_dbg(void) > +static void igt_aux_enable_pm_suspend_dbg(int power_dir) > { > int sysfs_fd; > > @@ -924,11 +934,18 @@ static void igt_aux_enable_pm_suspend_dbg(void) > if (sysfs_fd > 0) { > __console_suspend_saved_state = igt_sysfs_get_boolean(sysfs_fd, "console_suspend"); > igt_sysfs_set_boolean(sysfs_fd, "console_suspend", CONSOLE_SUSPEND_DISABLE); > - igt_install_exit_handler(igt_aux_pm_suspend_dbg_restore_exit_handler); > } else { > igt_warn("Unable to open printk parameters Err:%d\n", errno); > } > > + /* pm_debug_messages depends on CONFIG_PM_SLEEP_DEBUG */ > + if (!faccessat(power_dir, "pm_debug_messages", R_OK | W_OK, 0)) { > + __pm_debug_messages_state = igt_sysfs_get_boolean(sysfs_fd, "pm_debug_messages"); > + igt_sysfs_set_boolean(power_dir, "pm_debug_messages", true); > + } > + > + igt_install_exit_handler(igt_aux_pm_suspend_dbg_restore_exit_handler); > + > close(sysfs_fd); > } > > @@ -970,7 +987,7 @@ void igt_system_suspend_autoresume(enum igt_suspend_state state, > "Suspend to disk requires swap space.\n"); > > orig_test = get_suspend_test(power_dir); > - igt_aux_enable_pm_suspend_dbg(); > + igt_aux_enable_pm_suspend_dbg(power_dir); > > if (state == SUSPEND_STATE_S3) { > orig_mem_sleep = get_mem_sleep();