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[95.90.192.255]) by smtp.gmail.com with ESMTPSA id w15sm8580wmi.3.2021.07.26.06.23.22 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 26 Jul 2021 06:23:22 -0700 (PDT) From: shiva.linuxworks@gmail.com X-Google-Original-From: sshivamurthy@micron.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 , Keith Busch Subject: [PATCH v2 1/2] PM: enable support for imminent power loss Date: Mon, 26 Jul 2021 13:22:22 +0000 Message-Id: <20210726132223.1661-2-sshivamurthy@micron.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210726132223.1661-1-sshivamurthy@micron.com> References: <20210726132223.1661-1-sshivamurthy@micron.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Shivamurthy Shastri 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 Signed-off-by: Shivamurthy Shastri --- 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