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MIME-Version: 1.0 Message-Id: <20221127-snd-freeze-v8-2-3bc02d09f2ce@chromium.org> References: <20221127-snd-freeze-v8-0-3bc02d09f2ce@chromium.org> In-Reply-To: <20221127-snd-freeze-v8-0-3bc02d09f2ce@chromium.org> To: Juergen Gross , Mark Brown , Chromeos Kdump , Daniel Baluta , Christophe Leroy , Len Brown , Ard Biesheuvel , Ranjani Sridharan , "Rafael J. Wysocki" , Boris Ostrovsky , Nicholas Piggin , Michael Ellerman , Eric Biederman , Dave Hansen , Jaroslav Kysela , Joel Fernandes , Liam Girdwood , Peter Ujfalusi , Pavel Machek , Pierre-Louis Bossart , Kai Vehmanen , Steven Rostedt , "K. Y. Srinivasan" , Ingo Molnar , Bjorn Helgaas , Dexuan Cui , Takashi Iwai , "H. Peter Anvin" , Bard Liao , Haiyang Zhang , Wei Liu , Thomas Gleixner , Borislav Petkov , x86@kernel.org Cc: kexec@lists.infradead.org, alsa-devel@alsa-project.org, Ricardo Ribalda , stable@vger.kernel.org, sound-open-firmware@alsa-project.org, linuxppc-dev@lists.ozlabs.org, linux-hyperv@vger.kernel.org, linux-pci@vger.kernel.org, linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-efi@vger.kernel.org, xen-devel@lists.xenproject.org X-Mailer: b4 0.11.0-dev-696ae X-Developer-Signature: v=1; a=openpgp-sha256; l=3690; i=ribalda@chromium.org; h=from:subject:message-id; bh=Uyd503AUpFQ+wB60JzDX21uxeFYPmKS/1xEV6a/+nC0=; b=owEBbQKS/ZANAwAKAdE30T7POsSIAcsmYgBjiIs47YRD/lKW5LPJ0JDcZ66XVU0S36xAkU2Fyjx2 2sg9wC6JAjMEAAEKAB0WIQREDzjr+/4oCDLSsx7RN9E+zzrEiAUCY4iLOAAKCRDRN9E+zzrEiGFvD/ 97DssDxiQasPTlsNtz7Jry8QHtrWcpbeSa2Bm4gtZx1yhISwwBKhlnlj6KgFHG54yWyqPjrrVR0XTb DRsh8oxIzLjCsOJSaFHQVRhF6FQ+Sjacqhya5R4CgkbgCfYqD9BuqRs3k+WVdFOubhN2LtNG3lkx4T ue+l5QsOBRqMlPIvwRtgq2tpT+YUFNt5mgxSdvVT17WVelRA7EPFXF8dyd8oIs1E2iKfJpEnF/7Q4c 7SZhnlSjo1D/vgoGmvCA0YHqwNf+Gd0soCFD8VDqMs3MsHI+0iHfFmvW9qis9BQ6eEQXsouG9nOnqA GHMdhq3WU7pGrL5DkzQU30oUH+Tdpk7c8hfRF3dIlk9oU1KXSXe9pg/38OguyIttqFUH/iSKDS0L92 5vIDNhT9WlDT2uxzTt/kS9e7RVM3tR0vHpUMY48SrLT4ybX2MU+uX8pRhqF9B6yT+wCUozZXdnnFHC juHBoEPqlJn6F7z5v1GGk+dMOrd3JDk/aqI3cue3Q30WnL9D73CfUZ6MD9yALvFt8oSzUw8eMxA54/ ac6QXsBUvXHMT4klIUFhVCOtry1lTKgmIF+hciCKQi7qleoR5g5iI9YQ1pERS75u9s0tp/U5COC9rF H128taN2NiXJoQ2/mDCQbYyiZZ7qAhM+BNxsaDYWxtgKxmCMfSlcBFUTo+xA== X-Developer-Key: i=ribalda@chromium.org; a=openpgp; fpr=9EC3BB66E2FC129A6F90B39556A0D81F9F782DA9 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE, SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1751010465231937972?= X-GMAIL-MSGID: =?utf-8?q?1751010465231937972?= Add a way to let the drivers know if the processes are frozen. This is needed by drivers that are waiting for processes to end on their shutdown path. Convert pm_freezing into a function and export it, so it can be used by drivers that are either built-in or modules. Cc: stable@vger.kernel.org Fixes: 83bfc7e793b5 ("ASoC: SOF: core: unregister clients and machine drivers in .shutdown") Signed-off-by: Ricardo Ribalda sdad --- include/linux/freezer.h | 3 ++- kernel/freezer.c | 3 +-- kernel/power/process.c | 24 ++++++++++++++++++++---- 3 files changed, 23 insertions(+), 7 deletions(-) diff --git a/include/linux/freezer.h b/include/linux/freezer.h index b303472255be..3413c869d68b 100644 --- a/include/linux/freezer.h +++ b/include/linux/freezer.h @@ -13,7 +13,7 @@ #ifdef CONFIG_FREEZER DECLARE_STATIC_KEY_FALSE(freezer_active); -extern bool pm_freezing; /* PM freezing in effect */ +bool pm_freezing(void); extern bool pm_nosig_freezing; /* PM nosig freezing in effect */ /* @@ -80,6 +80,7 @@ static inline int freeze_processes(void) { return -ENOSYS; } static inline int freeze_kernel_threads(void) { return -ENOSYS; } static inline void thaw_processes(void) {} static inline void thaw_kernel_threads(void) {} +static inline bool pm_freezing(void) { return false; } static inline bool try_to_freeze(void) { return false; } diff --git a/kernel/freezer.c b/kernel/freezer.c index 4fad0e6fca64..2d3530ebdb7e 100644 --- a/kernel/freezer.c +++ b/kernel/freezer.c @@ -20,7 +20,6 @@ EXPORT_SYMBOL(freezer_active); * indicate whether PM freezing is in effect, protected by * system_transition_mutex */ -bool pm_freezing; bool pm_nosig_freezing; /* protects freezing and frozen transitions */ @@ -46,7 +45,7 @@ bool freezing_slow_path(struct task_struct *p) if (pm_nosig_freezing || cgroup_freezing(p)) return true; - if (pm_freezing && !(p->flags & PF_KTHREAD)) + if (pm_freezing() && !(p->flags & PF_KTHREAD)) return true; return false; diff --git a/kernel/power/process.c b/kernel/power/process.c index ddd9988327fe..8a4d0e2c8c20 100644 --- a/kernel/power/process.c +++ b/kernel/power/process.c @@ -108,6 +108,22 @@ static int try_to_freeze_tasks(bool user_only) return todo ? -EBUSY : 0; } +/* + * Indicate whether PM freezing is in effect, protected by + * system_transition_mutex. + */ +static bool pm_freezing_internal; + +/** + * pm_freezing - indicate whether PM freezing is in effect. + * + */ +bool pm_freezing(void) +{ + return pm_freezing_internal; +} +EXPORT_SYMBOL(pm_freezing); + /** * freeze_processes - Signal user space processes to enter the refrigerator. * The current thread will not be frozen. The same process that calls @@ -126,12 +142,12 @@ int freeze_processes(void) /* Make sure this task doesn't get frozen */ current->flags |= PF_SUSPEND_TASK; - if (!pm_freezing) + if (!pm_freezing()) static_branch_inc(&freezer_active); pm_wakeup_clear(0); pr_info("Freezing user space processes ... "); - pm_freezing = true; + pm_freezing_internal = true; error = try_to_freeze_tasks(true); if (!error) { __usermodehelper_set_disable_depth(UMH_DISABLED); @@ -187,9 +203,9 @@ void thaw_processes(void) struct task_struct *curr = current; trace_suspend_resume(TPS("thaw_processes"), 0, true); - if (pm_freezing) + if (pm_freezing()) static_branch_dec(&freezer_active); - pm_freezing = false; + pm_freezing_internal = false; pm_nosig_freezing = false; oom_killer_enable();