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[80.71.134.83]) by smtp.gmail.com with ESMTPSA id cz15-20020a0564021caf00b004589da5e5cesm786114edb.41.2022.11.30.08.29.42 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 30 Nov 2022 08:29:43 -0800 (PST) From: Ricardo Ribalda Date: Wed, 30 Nov 2022 17:29:20 +0100 Subject: [PATCH v7 1/2] kexec: Introduce kexec_with_frozen_processes MIME-Version: 1.0 Message-Id: <20221127-snd-freeze-v7-1-127c582f1ca4@chromium.org> References: <20221127-snd-freeze-v7-0-127c582f1ca4@chromium.org> In-Reply-To: <20221127-snd-freeze-v7-0-127c582f1ca4@chromium.org> To: Steven Rostedt , Peter Ujfalusi , Pierre-Louis Bossart , Jaroslav Kysela , Kai Vehmanen , Chromeos Kdump , Mark Brown , Ranjani Sridharan , Eric Biederman , Bard Liao , Daniel Baluta , Liam Girdwood , Takashi Iwai X-Mailer: b4 0.11.0-dev-696ae X-Developer-Signature: v=1; a=openpgp-sha256; l=1993; i=ribalda@chromium.org; h=from:subject:message-id; bh=1Eimjbcycq7qNsawd2rnV+J25oc3+SKoshi04EAzFkY=; b=owEBbQKS/ZANAwAKAdE30T7POsSIAcsmYgBjh4Tx9PZMNMSbqgT4Zoi7Sgxh6fRc9tbmVbCyGYlc GC5OS5KJAjMEAAEKAB0WIQREDzjr+/4oCDLSsx7RN9E+zzrEiAUCY4eE8QAKCRDRN9E+zzrEiGYkD/ 92N9Y4V14IUNRrC8n+NTCv5nr0Wh9MTAk9THEm+4TIUCb3UqoCmq2H9bF+N8XEN7J+RjxcUMQ0l/xe eA1eVXygt0w07oYoesMwZ8P7LTlvhN2Jkm9ePDQAcWLVFjgGixsThZokKgDa52sWE+eccR9biUr/Mu C4mLr7I+i1qYzVsANymbClIuaNEJPCGeHNqRSGCBOocwyqSWkSZEqHGIifb6LBHiecliMPwC4p36F0 yAhSh//F1oavhYQ/FQ2LMRG2/JMI6bTknYSGNyH/fTctVslP9foINRXJ3hAChrfxKlytpyG9mDWxfk UVN/LaV9JBwmwyJ2qwiqUB+l4s9LYU9QV+lwwOHZX15hcCfmZyB0AtcroP6Z48I6ERTbXa7Ng1Y5jJ V2A9QJAeZat9nfEwQsxpJxi1TLPsmQgBcjuTUZaYWxbjymLBC7u+4RWeJDjvSi0m29D8XhOgD+igKV aswBMZwtgA6SkzeIY/fP3el9EjPT8GQTYKoK2b//ArUC0pW5UCPiJ1OK4JzJkkF9E6P20/8dvtJk9h 2hFLnUS8s8iJ7aTazJ2WGGRPmRzzaDaK/YPbNZOiz7fbHWMbEB+spCGEX25Dgajb/qft6Ed3s1Aphi Fw++kttBHt8qnh2ZGuWwVaNdTPJY6vGashuAdgbrvcW/Pj/Jis2FalTkK9qA== X-Developer-Key: i=ribalda@chromium.org; a=openpgp; fpr=9EC3BB66E2FC129A6F90B39556A0D81F9F782DA9 Cc: alsa-devel@alsa-project.org, kexec@lists.infradead.org, linux-kernel@vger.kernel.org, stable@vger.kernel.org, Ricardo Ribalda , sound-open-firmware@alsa-project.org X-BeenThere: alsa-devel@alsa-project.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: "Alsa-devel mailing list for ALSA developers - http://www.alsa-project.org" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: alsa-devel-bounces@alsa-project.org Sender: "Alsa-devel" Drivers running .shutdown() might want to wait for userspace to complete before exiting. If userspace is frozen and we are running kexec they will stall the computer. Add a way for them to figure out if they should just skip waiting for userspace. Cc: stable@vger.kernel.org Fixes: 83bfc7e793b5 ("ASoC: SOF: core: unregister clients and machine drivers in .shutdown") Signed-off-by: Ricardo Ribalda --- include/linux/kexec.h | 3 +++ kernel/kexec_core.c | 5 +++++ 2 files changed, 8 insertions(+) diff --git a/include/linux/kexec.h b/include/linux/kexec.h index 41a686996aaa..c22711e0f7b5 100644 --- a/include/linux/kexec.h +++ b/include/linux/kexec.h @@ -426,6 +426,8 @@ extern int kexec_load_disabled; /* flag to track if kexec reboot is in progress */ extern bool kexec_in_progress; +bool kexec_with_frozen_processes(void); + int crash_shrink_memory(unsigned long new_size); ssize_t crash_get_memory_size(void); @@ -507,6 +509,7 @@ static inline void __crash_kexec(struct pt_regs *regs) { } static inline void crash_kexec(struct pt_regs *regs) { } static inline int kexec_should_crash(struct task_struct *p) { return 0; } static inline int kexec_crash_loaded(void) { return 0; } +static inline bool kexec_with_frozen_processes(void) { return false; } #define kexec_in_progress false #endif /* CONFIG_KEXEC_CORE */ diff --git a/kernel/kexec_core.c b/kernel/kexec_core.c index ca2743f9c634..8bc8257ee7ca 100644 --- a/kernel/kexec_core.c +++ b/kernel/kexec_core.c @@ -54,6 +54,11 @@ note_buf_t __percpu *crash_notes; /* Flag to indicate we are going to kexec a new kernel */ bool kexec_in_progress = false; +bool kexec_with_frozen_processes(void) +{ + return kexec_in_progress && pm_freezing; +} +EXPORT_SYMBOL(kexec_with_frozen_processes); /* Location of the reserved area for the crash kernel */ struct resource crashk_res = {