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[35.194.130.100]) by smtp.gmail.com with ESMTPSA id 41be03b00d2f7-c7921a3e6d2sm7615779a12.32.2026.04.12.14.20.05 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 12 Apr 2026 14:20:07 -0700 (PDT) From: Kuan-Wei Chiu To: geert@linux-m68k.org, sre@kernel.org Cc: jserv@ccns.ncku.edu.tw, eleanor15x@gmail.com, daniel@0x0f.com, laurent@vivier.eu, linux-kernel@vger.kernel.org, linux-m68k@lists.linux-m68k.org, linux-pm@vger.kernel.org, Kuan-Wei Chiu Subject: [PATCH v4 0/2] Add QEMU virt-ctrl driver and update m68k virt Date: Sun, 12 Apr 2026 21:19:50 +0000 Message-ID: <20260412211952.3564033-1-visitorckw@gmail.com> X-Mailer: git-send-email 2.53.0.1213.gd9a14994de-goog Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Introduce a generic platform driver for the QEMU 'virt-ctrl' device [1] and transitions the m68k 'virt' machine to use it, replacing architecture-specific hooks. The new driver ('qemu-virt-ctrl') registers a restart handler and populates the global 'pm_power_off' callback. On the m68k side, the platform initialization is updated to register the 'qemu-virt-ctrl' platform device. Additionally, the 'mach_reset' hook is bridged to 'do_kernel_restart()' to ensure the kernel's restart handler chain is correctly invoked. Verified on QEMU m68k virt. Both system reset and power-off were confirmed functional by invoking 'reboot(LINUX_REBOOT_CMD_RESTART)', 'reboot(LINUX_REBOOT_CMD_POWER_OFF)', and 'reboot(LINUX_REBOOT_CMD_HALT)' from userspace. Link: https://gitlab.com/qemu-project/qemu/-/blob/v10.2.0/hw/misc/virt_ctrl.c [1] --- Changes in v4: - Fix sparse warning caught by kernel test robot. - Pass the struct qemu_virt_ctrl context to sys-off handlers instead of the __iomem pointer. Changes in v3: - Add a reboot notifier in the driver to handle LINUX_REBOOT_CMD_HALT. - Handle native endianness in the driver instead of hardcoding big-endian I/O writes. - Select POWER_RESET and POWER_RESET_QEMU_VIRT_CTRL in m68k Kconfig.machine. Changes in v2: - Use devm_register_sys_off_handler() instead of register_restart_handler() and global pm_power_off. - Switch Kconfig to tristate to support modular build. - Add .id_table to platform_driver and use MODULE_DEVICE_TABLE() to correct module auto-loading. v2: https://lore.kernel.org/lkml/20260203170824.2968045-1-visitorckw@gmail.com/ v1: https://lore.kernel.org/lkml/20260112182258.1851769-1-visitorckw@gmail.com/ Kuan-Wei Chiu (2): power: reset: Add QEMU virt-ctrl driver m68k: virt: Switch to qemu-virt-ctrl driver MAINTAINERS | 6 ++ arch/m68k/Kconfig.machine | 2 + arch/m68k/virt/config.c | 42 +-------- arch/m68k/virt/platform.c | 20 ++++- drivers/power/reset/Kconfig | 10 +++ drivers/power/reset/Makefile | 1 + drivers/power/reset/qemu-virt-ctrl.c | 122 +++++++++++++++++++++++++++ 7 files changed, 159 insertions(+), 44 deletions(-) create mode 100644 drivers/power/reset/qemu-virt-ctrl.c -- 2.53.0.1213.gd9a14994de-goog