From: shiva.linuxworks@gmail.com To: rjw@rjwysocki.net, pavel@ucw.cz, len.brown@intel.com, linux-pm@vger.kernel.org, kbusch@kernel.org, axboe@fb.com, hch@lst.de, sagi@grimberg.me, linux-nvme@lists.infradead.org Cc: linux-kernel@vger.kernel.org, Shivamurthy Shastri <sshivamurthy@micron.com>, Keith Busch <kbush@kernel.org> Subject: [PATCH v2 1/2] PM: enable support for imminent power loss Date: Mon, 26 Jul 2021 13:22:22 +0000 [thread overview] Message-ID: <20210726132223.1661-2-sshivamurthy@micron.com> (raw) In-Reply-To: <20210726132223.1661-1-sshivamurthy@micron.com> From: Shivamurthy Shastri <sshivamurthy@micron.com> If the shutdown is pwerformed when the platform is running on the limited backup power supply, some of the devices might not have enough power to perform a clean shutdown. It is necessary to inform the driver about the limited backup power supply, to allow the driver to decide to perform the minimal required operation for a fast and clean shutdown. Signed-off-by: Keith Busch <kbush@kernel.org> Signed-off-by: Shivamurthy Shastri <sshivamurthy@micron.com> --- include/linux/suspend.h | 28 +++++++++++++++++++++++++--- 1 file changed, 25 insertions(+), 3 deletions(-) diff --git a/include/linux/suspend.h b/include/linux/suspend.h index 8af13ba60c7e..1898792c10d3 100644 --- a/include/linux/suspend.h +++ b/include/linux/suspend.h @@ -210,9 +210,10 @@ extern int suspend_valid_only_mem(suspend_state_t state); extern unsigned int pm_suspend_global_flags; -#define PM_SUSPEND_FLAG_FW_SUSPEND BIT(0) -#define PM_SUSPEND_FLAG_FW_RESUME BIT(1) -#define PM_SUSPEND_FLAG_NO_PLATFORM BIT(2) +#define PM_SUSPEND_FLAG_FW_SUSPEND BIT(0) +#define PM_SUSPEND_FLAG_FW_RESUME BIT(1) +#define PM_SUSPEND_FLAG_NO_PLATFORM BIT(2) +#define PM_SUSPEND_FLAG_POWER_LOSS_IMMINENT BIT(3) static inline void pm_suspend_clear_flags(void) { @@ -234,6 +235,11 @@ static inline void pm_set_suspend_no_platform(void) pm_suspend_global_flags |= PM_SUSPEND_FLAG_NO_PLATFORM; } +static inline void pm_set_power_loss_imminent(void) +{ + pm_suspend_global_flags |= PM_SUSPEND_FLAG_POWER_LOSS_IMMINENT; +} + /** * pm_suspend_via_firmware - Check if platform firmware will suspend the system. * @@ -291,6 +297,22 @@ static inline bool pm_suspend_no_platform(void) return !!(pm_suspend_global_flags & PM_SUSPEND_FLAG_NO_PLATFORM); } +/** + * pm_power_loss_imminent - Check if platform is running on limited backup power + * source + * + * To be called during system-wide power management transitions to sleep states. + * + * Return 'true' if power loss may be imminent due to platform running on + * limited backup supply. If set during a shutdown, drivers should use any + * available shortcuts to prepare their device for abrupt power loss. + */ +static inline bool pm_power_loss_imminent(void) +{ + return !!(pm_suspend_global_flags & + PM_SUSPEND_FLAG_POWER_LOSS_IMMINENT); +} + /* Suspend-to-idle state machnine. */ enum s2idle_states { S2IDLE_STATE_NONE, /* Not suspended/suspending. */ -- 2.25.1
WARNING: multiple messages have this Message-ID (diff)
From: shiva.linuxworks@gmail.com To: rjw@rjwysocki.net, pavel@ucw.cz, len.brown@intel.com, linux-pm@vger.kernel.org, kbusch@kernel.org, axboe@fb.com, hch@lst.de, sagi@grimberg.me, linux-nvme@lists.infradead.org Cc: linux-kernel@vger.kernel.org, Shivamurthy Shastri <sshivamurthy@micron.com>, Keith Busch <kbush@kernel.org> Subject: [PATCH v2 1/2] PM: enable support for imminent power loss Date: Mon, 26 Jul 2021 13:22:22 +0000 [thread overview] Message-ID: <20210726132223.1661-2-sshivamurthy@micron.com> (raw) In-Reply-To: <20210726132223.1661-1-sshivamurthy@micron.com> From: Shivamurthy Shastri <sshivamurthy@micron.com> If the shutdown is pwerformed when the platform is running on the limited backup power supply, some of the devices might not have enough power to perform a clean shutdown. It is necessary to inform the driver about the limited backup power supply, to allow the driver to decide to perform the minimal required operation for a fast and clean shutdown. Signed-off-by: Keith Busch <kbush@kernel.org> Signed-off-by: Shivamurthy Shastri <sshivamurthy@micron.com> --- include/linux/suspend.h | 28 +++++++++++++++++++++++++--- 1 file changed, 25 insertions(+), 3 deletions(-) diff --git a/include/linux/suspend.h b/include/linux/suspend.h index 8af13ba60c7e..1898792c10d3 100644 --- a/include/linux/suspend.h +++ b/include/linux/suspend.h @@ -210,9 +210,10 @@ extern int suspend_valid_only_mem(suspend_state_t state); extern unsigned int pm_suspend_global_flags; -#define PM_SUSPEND_FLAG_FW_SUSPEND BIT(0) -#define PM_SUSPEND_FLAG_FW_RESUME BIT(1) -#define PM_SUSPEND_FLAG_NO_PLATFORM BIT(2) +#define PM_SUSPEND_FLAG_FW_SUSPEND BIT(0) +#define PM_SUSPEND_FLAG_FW_RESUME BIT(1) +#define PM_SUSPEND_FLAG_NO_PLATFORM BIT(2) +#define PM_SUSPEND_FLAG_POWER_LOSS_IMMINENT BIT(3) static inline void pm_suspend_clear_flags(void) { @@ -234,6 +235,11 @@ static inline void pm_set_suspend_no_platform(void) pm_suspend_global_flags |= PM_SUSPEND_FLAG_NO_PLATFORM; } +static inline void pm_set_power_loss_imminent(void) +{ + pm_suspend_global_flags |= PM_SUSPEND_FLAG_POWER_LOSS_IMMINENT; +} + /** * pm_suspend_via_firmware - Check if platform firmware will suspend the system. * @@ -291,6 +297,22 @@ static inline bool pm_suspend_no_platform(void) return !!(pm_suspend_global_flags & PM_SUSPEND_FLAG_NO_PLATFORM); } +/** + * pm_power_loss_imminent - Check if platform is running on limited backup power + * source + * + * To be called during system-wide power management transitions to sleep states. + * + * Return 'true' if power loss may be imminent due to platform running on + * limited backup supply. If set during a shutdown, drivers should use any + * available shortcuts to prepare their device for abrupt power loss. + */ +static inline bool pm_power_loss_imminent(void) +{ + return !!(pm_suspend_global_flags & + PM_SUSPEND_FLAG_POWER_LOSS_IMMINENT); +} + /* Suspend-to-idle state machnine. */ enum s2idle_states { S2IDLE_STATE_NONE, /* Not suspended/suspending. */ -- 2.25.1 _______________________________________________ Linux-nvme mailing list Linux-nvme@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-nvme
next prev parent reply other threads:[~2021-07-26 13:23 UTC|newest] Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-07-26 13:22 [PATCH v2 0/2] Abrupt Shutdown for NVMe SSD shiva.linuxworks 2021-07-26 13:22 ` shiva.linuxworks 2021-07-26 13:22 ` shiva.linuxworks [this message] 2021-07-26 13:22 ` [PATCH v2 1/2] PM: enable support for imminent power loss shiva.linuxworks 2021-07-26 19:41 ` Pavel Machek 2021-07-26 19:41 ` Pavel Machek 2021-07-26 20:16 ` Keith Busch 2021-07-26 20:16 ` Keith Busch 2021-07-26 13:22 ` [PATCH v2 2/2] nvme: Add abrupt shutdown support shiva.linuxworks 2021-07-26 13:22 ` shiva.linuxworks 2021-07-26 16:07 ` kernel test robot 2021-07-26 16:07 ` kernel test robot 2021-07-26 16:07 ` kernel test robot 2021-07-26 16:43 ` kernel test robot 2021-07-26 16:43 ` kernel test robot 2021-07-26 16:43 ` kernel test robot 2021-07-26 15:24 ` [PATCH v2 0/2] Abrupt Shutdown for NVMe SSD Keith Busch 2021-07-26 15:24 ` Keith Busch 2021-07-29 10:37 ` [EXT] " Shivamurthy Shastri (sshivamurthy) 2021-07-29 10:37 ` Shivamurthy Shastri (sshivamurthy)
Reply instructions: You may reply publicly to this message via plain-text email using any one of the following methods: * Save the following mbox file, import it into your mail client, and reply-to-all from there: mbox Avoid top-posting and favor interleaved quoting: https://en.wikipedia.org/wiki/Posting_style#Interleaved_style * Reply using the --to, --cc, and --in-reply-to switches of git-send-email(1): git send-email \ --in-reply-to=20210726132223.1661-2-sshivamurthy@micron.com \ --to=shiva.linuxworks@gmail.com \ --cc=axboe@fb.com \ --cc=hch@lst.de \ --cc=kbusch@kernel.org \ --cc=kbush@kernel.org \ --cc=len.brown@intel.com \ --cc=linux-kernel@vger.kernel.org \ --cc=linux-nvme@lists.infradead.org \ --cc=linux-pm@vger.kernel.org \ --cc=pavel@ucw.cz \ --cc=rjw@rjwysocki.net \ --cc=sagi@grimberg.me \ --cc=sshivamurthy@micron.com \ /path/to/YOUR_REPLY https://kernel.org/pub/software/scm/git/docs/git-send-email.html * If your mail client supports setting the In-Reply-To header via mailto: links, try the mailto: linkBe sure your reply has a Subject: header at the top and a blank line before the message body.
This is an external index of several public inboxes, see mirroring instructions on how to clone and mirror all data and code used by this external index.