Merge tag 'm68k-for-v7.1-tag1' of git://git.kernel.org/pub/scm/linux/kernel/git/geert/linux-m68k

torvalds · torvalds · commit 090748e62f57 · 2026-04-16T08:11:01.000-07:00
Pull m68k updates from Geert Uytterhoeven:

 - Add support for QEMU virt-ctrl, and use it for system reset
   and power off on the virt platform

 - defconfig updates

 - Miscellaneous fixes and improvements

* tag 'm68k-for-v7.1-tag1' of git://git.kernel.org/pub/scm/linux/kernel/git/geert/linux-m68k:
  m68k: virt: Switch to qemu-virt-ctrl driver
  power: reset: Add QEMU virt-ctrl driver
  m68k: defconfig: Update defconfigs for v7.0-rc1
  m68k: emu: Replace unbounded sprintf() in nfhd_init_one()
  m68k: uapi: Add ucontext.h
  m68k: defconfig: hp300: Enable monochrome and 16-color linux logos
  m68k: q40: Remove commented out code
diff --git a/MAINTAINERS b/MAINTAINERS
@@ -21592,6 +21592,12 @@ S:	Maintained
 F:	drivers/firmware/qemu_fw_cfg.c
 F:	include/uapi/linux/qemu_fw_cfg.h
 
+QEMU VIRT MACHINE SYSTEM CONTROLLER DRIVER
+M:	Kuan-Wei Chiu <visitorckw@gmail.com>
+L:	linux-pm@vger.kernel.org
+S:	Maintained
+F:	drivers/power/reset/qemu-virt-ctrl.c
+
 QLOGIC QL41xxx FCOE DRIVER
 M:	Saurav Kashyap <skashyap@marvell.com>
 M:	Javed Hasan <jhasan@marvell.com>
diff --git a/arch/m68k/Kconfig.machine b/arch/m68k/Kconfig.machine
@@ -133,6 +133,8 @@ config VIRT
 	select GOLDFISH_TIMER
 	select GOLDFISH_TTY
 	select M68040
+	select POWER_RESET
+	select POWER_RESET_QEMU_VIRT_CTRL
 	select RTC_CLASS
 	select RTC_DRV_GOLDFISH
 	select TTY
diff --git a/arch/m68k/configs/amiga_defconfig b/arch/m68k/configs/amiga_defconfig
@@ -386,6 +386,8 @@ CONFIG_FB_FM2=y
 CONFIG_FRAMEBUFFER_CONSOLE=y
 CONFIG_FRAMEBUFFER_CONSOLE_LEGACY_ACCELERATION=y
 CONFIG_LOGO=y
+CONFIG_LOGO_LINUX_MONO=y
+CONFIG_LOGO_LINUX_VGA16=y
 CONFIG_SOUND=m
 CONFIG_DMASOUND_PAULA=m
 CONFIG_HID=m
diff --git a/arch/m68k/configs/apollo_defconfig b/arch/m68k/configs/apollo_defconfig
@@ -344,7 +344,7 @@ CONFIG_FB=y
 CONFIG_FRAMEBUFFER_CONSOLE=y
 CONFIG_FRAMEBUFFER_CONSOLE_LEGACY_ACCELERATION=y
 CONFIG_LOGO=y
-# CONFIG_LOGO_LINUX_VGA16 is not set
+CONFIG_LOGO_LINUX_MONO=y
 # CONFIG_LOGO_LINUX_CLUT224 is not set
 CONFIG_HID=m
 CONFIG_HIDRAW=y
diff --git a/arch/m68k/configs/atari_defconfig b/arch/m68k/configs/atari_defconfig
@@ -366,6 +366,8 @@ CONFIG_FB=y
 CONFIG_FB_ATARI=y
 CONFIG_FRAMEBUFFER_CONSOLE=y
 CONFIG_LOGO=y
+CONFIG_LOGO_LINUX_MONO=y
+CONFIG_LOGO_LINUX_VGA16=y
 CONFIG_SOUND=m
 CONFIG_DMASOUND_ATARI=m
 CONFIG_HID=m
diff --git a/arch/m68k/configs/hp300_defconfig b/arch/m68k/configs/hp300_defconfig
@@ -346,8 +346,8 @@ CONFIG_FB=y
 CONFIG_FRAMEBUFFER_CONSOLE=y
 CONFIG_FRAMEBUFFER_CONSOLE_LEGACY_ACCELERATION=y
 CONFIG_LOGO=y
-# CONFIG_LOGO_LINUX_MONO is not set
-# CONFIG_LOGO_LINUX_VGA16 is not set
+CONFIG_LOGO_LINUX_MONO=y
+CONFIG_LOGO_LINUX_VGA16=y
 CONFIG_HID=m
 CONFIG_HIDRAW=y
 CONFIG_UHID=m
diff --git a/arch/m68k/configs/mac_defconfig b/arch/m68k/configs/mac_defconfig
@@ -365,6 +365,8 @@ CONFIG_FB_VALKYRIE=y
 CONFIG_FB_MAC=y
 CONFIG_FRAMEBUFFER_CONSOLE=y
 CONFIG_LOGO=y
+CONFIG_LOGO_LINUX_MONO=y
+CONFIG_LOGO_LINUX_VGA16=y
 CONFIG_HID=m
 CONFIG_HIDRAW=y
 CONFIG_UHID=m
diff --git a/arch/m68k/configs/multi_defconfig b/arch/m68k/configs/multi_defconfig
@@ -445,6 +445,8 @@ CONFIG_FB_MAC=y
 CONFIG_FRAMEBUFFER_CONSOLE=y
 CONFIG_FRAMEBUFFER_CONSOLE_LEGACY_ACCELERATION=y
 CONFIG_LOGO=y
+CONFIG_LOGO_LINUX_MONO=y
+CONFIG_LOGO_LINUX_VGA16=y
 CONFIG_SOUND=m
 CONFIG_DMASOUND_ATARI=m
 CONFIG_DMASOUND_PAULA=m
diff --git a/arch/m68k/configs/q40_defconfig b/arch/m68k/configs/q40_defconfig
@@ -353,6 +353,8 @@ CONFIG_PTP_1588_CLOCK=m
 CONFIG_FB=y
 CONFIG_FRAMEBUFFER_CONSOLE=y
 CONFIG_LOGO=y
+CONFIG_LOGO_LINUX_MONO=y
+CONFIG_LOGO_LINUX_VGA16=y
 CONFIG_SOUND=m
 CONFIG_DMASOUND_Q40=m
 CONFIG_HID=m
diff --git a/arch/m68k/emu/nfblock.c b/arch/m68k/emu/nfblock.c
@@ -132,7 +132,8 @@ static int __init nfhd_init_one(int id, u32 blocks, u32 bsize)
 	dev->disk->minors = 16;
 	dev->disk->fops = &nfhd_ops;
 	dev->disk->private_data = dev;
-	sprintf(dev->disk->disk_name, "nfhd%u", dev_id);
+	snprintf(dev->disk->disk_name, sizeof(dev->disk->disk_name), "nfhd%u",
+		 dev_id);
 	set_capacity(dev->disk, (sector_t)blocks * (bsize / 512));
 	err = add_disk(dev->disk);
 	if (err)
diff --git a/arch/m68k/include/uapi/asm/ucontext.h b/arch/m68k/include/uapi/asm/ucontext.h
@@ -1,7 +1,10 @@
-/* SPDX-License-Identifier: GPL-2.0 */
+/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
 #ifndef _M68K_UCONTEXT_H
 #define _M68K_UCONTEXT_H
 
+#include <asm/sigcontext.h>
+#include <asm/signal.h>
+
 typedef int greg_t;
 #define NGREG 18
 typedef greg_t gregset_t[NGREG];
diff --git a/arch/m68k/q40/config.c b/arch/m68k/q40/config.c
@@ -74,7 +74,6 @@ static int __init q40_debug_setup(char *arg)
 {
 	/* useful for early debugging stages - writes kernel messages into SRAM */
 	if (MACH_IS_Q40 && !strncmp(arg, "mem", 3)) {
-		/*pr_info("using NVRAM debug, q40_mem_cptr=%p\n",q40_mem_cptr);*/
 		_cpleft = 2000 - ((long)q40_mem_cptr-0xff020000) / 4;
 		register_console(&q40_console_driver);
 	}
@@ -83,20 +82,6 @@ static int __init q40_debug_setup(char *arg)
 
 early_param("debug", q40_debug_setup);
 
-#if 0
-void printq40(char *str)
-{
-	int l = strlen(str);
-	char *p = q40_mem_cptr;
-
-	while (l-- > 0 && _cpleft-- > 0) {
-		*p = *str++;
-		p += 4;
-	}
-	q40_mem_cptr = p;
-}
-#endif
-
 static int halted;
 
 #ifdef CONFIG_HEARTBEAT
diff --git a/arch/m68k/virt/config.c b/arch/m68k/virt/config.c
@@ -13,18 +13,6 @@
 
 struct virt_booter_data virt_bi_data;
 
-#define VIRT_CTRL_REG_FEATURES	0x00
-#define VIRT_CTRL_REG_CMD	0x04
-
-static struct resource ctrlres;
-
-enum {
-	CMD_NOOP,
-	CMD_RESET,
-	CMD_HALT,
-	CMD_PANIC,
-};
-
 static void virt_get_model(char *str)
 {
 	/* str is 80 characters long */
@@ -33,25 +21,9 @@ static void virt_get_model(char *str)
 		(u8)(virt_bi_data.qemu_version >> 16),
 		(u8)(virt_bi_data.qemu_version >> 8));
 }
-
-static void virt_halt(void)
-{
-	void __iomem *base = (void __iomem *)virt_bi_data.ctrl.mmio;
-
-	iowrite32be(CMD_HALT, base + VIRT_CTRL_REG_CMD);
-	local_irq_disable();
-	while (1)
-		;
-}
-
 static void virt_reset(void)
 {
-	void __iomem *base = (void __iomem *)virt_bi_data.ctrl.mmio;
-
-	iowrite32be(CMD_RESET, base + VIRT_CTRL_REG_CMD);
-	local_irq_disable();
-	while (1)
-		;
+	do_kernel_restart(NULL);
 }
 
 /*
@@ -113,20 +85,8 @@ void __init config_virt(void)
 		 virt_bi_data.tty.mmio);
 	setup_earlycon(earlycon);
 
-	ctrlres = (struct resource)
-		   DEFINE_RES_MEM_NAMED(virt_bi_data.ctrl.mmio, 0x100,
-					"virtctrl");
-
-	if (request_resource(&iomem_resource, &ctrlres)) {
-		pr_err("Cannot allocate virt controller resource\n");
-		return;
-	}
-
 	mach_init_IRQ = virt_init_IRQ;
 	mach_sched_init = virt_sched_init;
 	mach_get_model = virt_get_model;
 	mach_reset = virt_reset;
-	mach_halt = virt_halt;
-
-	register_platform_power_off(virt_halt);
 }
diff --git a/arch/m68k/virt/platform.c b/arch/m68k/virt/platform.c
@@ -30,7 +30,10 @@ static int __init virt_platform_init(void)
 		DEFINE_RES_MEM(virt_bi_data.rtc.mmio + 0x1000, 0x1000),
 		DEFINE_RES_IRQ(virt_bi_data.rtc.irq + 1),
 	};
-	struct platform_device *pdev1, *pdev2;
+	const struct resource virt_ctrl_res[] = {
+		DEFINE_RES_MEM(virt_bi_data.ctrl.mmio, 0x100),
+	};
+	struct platform_device *pdev1, *pdev2, *pdev3;
 	struct platform_device *pdevs[VIRTIO_BUS_NB];
 	unsigned int i;
 	int ret = 0;
@@ -57,19 +60,30 @@ static int __init virt_platform_init(void)
 		goto err_unregister_tty;
 	}
 
+	pdev3 = platform_device_register_simple("qemu-virt-ctrl",
+						PLATFORM_DEVID_NONE,
+						virt_ctrl_res,
+						ARRAY_SIZE(virt_ctrl_res));
+	if (IS_ERR(pdev3)) {
+		ret = PTR_ERR(pdev3);
+		goto err_unregister_rtc;
+	}
+
 	for (i = 0; i < VIRTIO_BUS_NB; i++) {
 		pdevs[i] = virt_virtio_init(i);
 		if (IS_ERR(pdevs[i])) {
 			ret = PTR_ERR(pdevs[i]);
-			goto err_unregister_rtc_virtio;
+			goto err_unregister_virtio;
 		}
 	}
 
 	return 0;
 
-err_unregister_rtc_virtio:
+err_unregister_virtio:
 	while (i > 0)
 		platform_device_unregister(pdevs[--i]);
+	platform_device_unregister(pdev3);
+err_unregister_rtc:
 	platform_device_unregister(pdev2);
 err_unregister_tty:
 	platform_device_unregister(pdev1);
diff --git a/drivers/power/reset/Kconfig b/drivers/power/reset/Kconfig
@@ -354,4 +354,14 @@ config POWER_MLXBF
 	help
 	  This driver supports reset or low power mode handling for Mellanox BlueField.
 
+config POWER_RESET_QEMU_VIRT_CTRL
+	tristate "QEMU Virt Machine System Controller"
+	depends on HAS_IOMEM
+	help
+	  This driver supports the system reset and power off functionality
+	  provided by the QEMU 'virt-ctrl' device.
+
+	  Say Y here if you are running Linux on a QEMU virtual machine that
+	  provides this controller, such as the m68k virt machine.
+
 endif
diff --git a/drivers/power/reset/Makefile b/drivers/power/reset/Makefile
@@ -41,3 +41,4 @@ obj-$(CONFIG_SYSCON_REBOOT_MODE) += syscon-reboot-mode.o
 obj-$(CONFIG_POWER_RESET_SC27XX) += sc27xx-poweroff.o
 obj-$(CONFIG_NVMEM_REBOOT_MODE) += nvmem-reboot-mode.o
 obj-$(CONFIG_POWER_MLXBF) += pwr-mlxbf.o
+obj-$(CONFIG_POWER_RESET_QEMU_VIRT_CTRL) += qemu-virt-ctrl.o
diff --git a/drivers/power/reset/qemu-virt-ctrl.c b/drivers/power/reset/qemu-virt-ctrl.c
@@ -0,0 +1,122 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * QEMU Virt Machine System Controller Driver
+ *
+ * Copyright (C) 2026 Kuan-Wei Chiu <visitorckw@gmail.com>
+ */
+
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/mod_devicetable.h>
+#include <linux/platform_device.h>
+#include <linux/reboot.h>
+
+/* Registers */
+#define VIRT_CTRL_REG_FEATURES	0x00
+#define VIRT_CTRL_REG_CMD	0x04
+
+/* Commands */
+#define CMD_NOOP	0
+#define CMD_RESET	1
+#define CMD_HALT	2
+#define CMD_PANIC	3
+
+struct qemu_virt_ctrl {
+	void __iomem *base;
+	struct notifier_block reboot_nb;
+};
+
+static inline void virt_ctrl_write32(u32 val, void __iomem *addr)
+{
+	if (IS_ENABLED(CONFIG_CPU_BIG_ENDIAN))
+		iowrite32be(val, addr);
+	else
+		iowrite32(val, addr);
+}
+
+static int qemu_virt_ctrl_power_off(struct sys_off_data *data)
+{
+	struct qemu_virt_ctrl *ctrl = data->cb_data;
+
+	virt_ctrl_write32(CMD_HALT, ctrl->base + VIRT_CTRL_REG_CMD);
+
+	return NOTIFY_DONE;
+}
+
+static int qemu_virt_ctrl_restart(struct sys_off_data *data)
+{
+	struct qemu_virt_ctrl *ctrl = data->cb_data;
+
+	virt_ctrl_write32(CMD_RESET, ctrl->base + VIRT_CTRL_REG_CMD);
+
+	return NOTIFY_DONE;
+}
+
+static int qemu_virt_ctrl_reboot_notify(struct notifier_block *nb,
+					unsigned long action, void *data)
+{
+	struct qemu_virt_ctrl *ctrl = container_of(nb, struct qemu_virt_ctrl, reboot_nb);
+
+	if (action == SYS_HALT)
+		virt_ctrl_write32(CMD_HALT, ctrl->base + VIRT_CTRL_REG_CMD);
+
+	return NOTIFY_DONE;
+}
+
+static int qemu_virt_ctrl_probe(struct platform_device *pdev)
+{
+	struct qemu_virt_ctrl *ctrl;
+	int ret;
+
+	ctrl = devm_kzalloc(&pdev->dev, sizeof(*ctrl), GFP_KERNEL);
+	if (!ctrl)
+		return -ENOMEM;
+
+	ctrl->base = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(ctrl->base))
+		return PTR_ERR(ctrl->base);
+
+	ret = devm_register_sys_off_handler(&pdev->dev,
+					    SYS_OFF_MODE_RESTART,
+					    SYS_OFF_PRIO_DEFAULT,
+					    qemu_virt_ctrl_restart,
+					    ctrl);
+	if (ret)
+		return dev_err_probe(&pdev->dev, ret,
+				     "cannot register restart handler\n");
+
+	ret = devm_register_sys_off_handler(&pdev->dev,
+					    SYS_OFF_MODE_POWER_OFF,
+					    SYS_OFF_PRIO_DEFAULT,
+					    qemu_virt_ctrl_power_off,
+					    ctrl);
+	if (ret)
+		return dev_err_probe(&pdev->dev, ret,
+				     "cannot register power-off handler\n");
+
+	ctrl->reboot_nb.notifier_call = qemu_virt_ctrl_reboot_notify;
+	ret = devm_register_reboot_notifier(&pdev->dev, &ctrl->reboot_nb);
+	if (ret)
+		return dev_err_probe(&pdev->dev, ret, "cannot register reboot notifier\n");
+
+	return 0;
+}
+
+static const struct platform_device_id qemu_virt_ctrl_id[] = {
+	{ "qemu-virt-ctrl", 0 },
+	{ }
+};
+MODULE_DEVICE_TABLE(platform, qemu_virt_ctrl_id);
+
+static struct platform_driver qemu_virt_ctrl_driver = {
+	.probe = qemu_virt_ctrl_probe,
+	.driver = {
+		.name = "qemu-virt-ctrl",
+	},
+	.id_table = qemu_virt_ctrl_id,
+};
+module_platform_driver(qemu_virt_ctrl_driver);
+
+MODULE_AUTHOR("Kuan-Wei Chiu <visitorckw@gmail.com>");
+MODULE_DESCRIPTION("QEMU Virt Machine System Controller Driver");
+MODULE_LICENSE("GPL");
