Merge branches 'acpi-apei', 'acpi-wakeup', 'acpi-reboot' and 'acpi-thermal'

Merge additional APEI changes, ACPI updates related to device wakeup and
system restart and ACPI thermal driver cleanups for 6.1-rc1:

 - Fix a memory leak in APEI by avoiding to add do not add task_work to
   kernel threads running when an asynchronous error is detected (Shuai
   Xue).

 - Add ACPI support for handling system wakeups via GPIO wake capable
   IRQs in addition to GPEs (Raul E Rangel).

 - Make the system reboot code put ACPI-enabled systems into the S5
   (system off) state which is necessary for some platforms to work as
   expected (Kai-Heng Feng).

 - Make the white space usage in the ACPI thermal driver more consistent
   and drop redundant code from it (Rafael Wysocki).

* acpi-apei:
  ACPI: APEI: do not add task_work to kernel thread to avoid memory leak

* acpi-wakeup:
  ACPI: PM: Take wake IRQ into consideration when entering suspend-to-idle
  i2c: acpi: Use ACPI wake capability bit to set wake_irq
  ACPI: resources: Add wake_capable parameter to acpi_dev_irq_flags
  gpiolib: acpi: Add wake_capable variants of acpi_dev_gpio_irq_get

* acpi-reboot:
  PM: ACPI: reboot: Reinstate S5 for reboot
  kernel/reboot: Add SYS_OFF_MODE_RESTART_PREPARE mode

* acpi-thermal:
  ACPI: thermal: Drop some redundant code
  ACPI: thermal: Drop redundant parens from expressions
  ACPI: thermal: Use white space more consistently

drivers/acpi/apei/ghes.c

@@ -985,7 +985,7 @@ static void ghes_proc_in_irq(struct irq_work *irq_work)
 				ghes_estatus_cache_add(generic, estatus);
 		}
 
-		if (task_work_pending && current->mm != &init_mm) {
+		if (task_work_pending && current->mm) {
 			estatus_node->task_work.func = ghes_kick_task_work;
 			estatus_node->task_work_cpu = smp_processor_id();
 			ret = task_work_add(current, &estatus_node->task_work,

drivers/acpi/device_pm.c

@@ -687,7 +687,22 @@ static int acpi_dev_pm_get_state(struct device *dev, struct acpi_device *adev,
 		d_min = ret;
 		wakeup = device_may_wakeup(dev) && adev->wakeup.flags.valid
 			&& adev->wakeup.sleep_state >= target_state;
+	} else if (device_may_wakeup(dev) && dev->power.wakeirq) {
+		/*
+		 * The ACPI subsystem doesn't manage the wake bit for IRQs
+		 * defined with ExclusiveAndWake and SharedAndWake. Instead we
+		 * expect them to be managed via the PM subsystem. Drivers
+		 * should call dev_pm_set_wake_irq to register an IRQ as a wake
+		 * source.
+		 *
+		 * If a device has a wake IRQ attached we need to check the
+		 * _S0W method to get the correct wake D-state. Otherwise we
+		 * end up putting the device into D3Cold which will more than
+		 * likely disable wake functionality.
+		 */
+		wakeup = true;
 	} else {
+		/* ACPI GPE is specified in _PRW. */
 		wakeup = adev->wakeup.flags.valid;
 	}
 

drivers/acpi/irq.c

@@ -147,6 +147,7 @@ struct acpi_irq_parse_one_ctx {
  * @polarity: polarity attributes of hwirq
  * @polarity: polarity attributes of hwirq
  * @shareable: shareable attributes of hwirq
+ * @wake_capable: wake capable attribute of hwirq
  * @ctx: acpi_irq_parse_one_ctx updated by this function
  *
  * Description:
@@ -156,12 +157,13 @@ struct acpi_irq_parse_one_ctx {
 static inline void acpi_irq_parse_one_match(struct fwnode_handle *fwnode,
 					    u32 hwirq, u8 triggering,
 					    u8 polarity, u8 shareable,
+					    u8 wake_capable,
 					    struct acpi_irq_parse_one_ctx *ctx)
 {
 	if (!fwnode)
 		return;
 	ctx->rc = 0;
-	*ctx->res_flags = acpi_dev_irq_flags(triggering, polarity, shareable);
+	*ctx->res_flags = acpi_dev_irq_flags(triggering, polarity, shareable, wake_capable);
 	ctx->fwspec->fwnode = fwnode;
 	ctx->fwspec->param[0] = hwirq;
 	ctx->fwspec->param[1] = acpi_dev_get_irq_type(triggering, polarity);
@@ -204,7 +206,7 @@ static acpi_status acpi_irq_parse_one_cb(struct acpi_resource *ares,
 		fwnode = acpi_get_gsi_domain_id(irq->interrupts[ctx->index]);
 		acpi_irq_parse_one_match(fwnode, irq->interrupts[ctx->index],
 					 irq->triggering, irq->polarity,
-					 irq->shareable, ctx);
+					 irq->shareable, irq->wake_capable, ctx);
 		return AE_CTRL_TERMINATE;
 	case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
 		eirq = &ares->data.extended_irq;
@@ -218,7 +220,7 @@ static acpi_status acpi_irq_parse_one_cb(struct acpi_resource *ares,
 						      eirq->interrupts[ctx->index]);
 		acpi_irq_parse_one_match(fwnode, eirq->interrupts[ctx->index],
 					 eirq->triggering, eirq->polarity,
-					 eirq->shareable, ctx);
+					 eirq->shareable, eirq->wake_capable, ctx);
 		return AE_CTRL_TERMINATE;
 	}
 

drivers/acpi/resource.c

@@ -336,8 +336,9 @@ EXPORT_SYMBOL_GPL(acpi_dev_resource_ext_address_space);
  * @triggering: Triggering type as provided by ACPI.
  * @polarity: Interrupt polarity as provided by ACPI.
  * @shareable: Whether or not the interrupt is shareable.
+ * @wake_capable: Wake capability as provided by ACPI.
  */
-unsigned long acpi_dev_irq_flags(u8 triggering, u8 polarity, u8 shareable)
+unsigned long acpi_dev_irq_flags(u8 triggering, u8 polarity, u8 shareable, u8 wake_capable)
 {
 	unsigned long flags;
 
@@ -351,6 +352,9 @@ unsigned long acpi_dev_irq_flags(u8 triggering, u8 polarity, u8 shareable)
 	if (shareable == ACPI_SHARED)
 		flags |= IORESOURCE_IRQ_SHAREABLE;
 
+	if (wake_capable == ACPI_WAKE_CAPABLE)
+		flags |= IORESOURCE_IRQ_WAKECAPABLE;
+
 	return flags | IORESOURCE_IRQ;
 }
 EXPORT_SYMBOL_GPL(acpi_dev_irq_flags);
@@ -468,7 +472,7 @@ static bool acpi_dev_irq_override(u32 gsi, u8 triggering, u8 polarity,
 
 static void acpi_dev_get_irqresource(struct resource *res, u32 gsi,
 				     u8 triggering, u8 polarity, u8 shareable,
-				     bool check_override)
+				     u8 wake_capable, bool check_override)
 {
 	int irq, p, t;
 
@@ -501,7 +505,7 @@ static void acpi_dev_get_irqresource(struct resource *res, u32 gsi,
 		}
 	}
 
-	res->flags = acpi_dev_irq_flags(triggering, polarity, shareable);
+	res->flags = acpi_dev_irq_flags(triggering, polarity, shareable, wake_capable);
 	irq = acpi_register_gsi(NULL, gsi, triggering, polarity);
 	if (irq >= 0) {
 		res->start = irq;
@@ -549,7 +553,8 @@ bool acpi_dev_resource_interrupt(struct acpi_resource *ares, int index,
 		}
 		acpi_dev_get_irqresource(res, irq->interrupts[index],
 					 irq->triggering, irq->polarity,
-					 irq->shareable, true);
+					 irq->shareable, irq->wake_capable,
+					 true);
 		break;
 	case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
 		ext_irq = &ares->data.extended_irq;
@@ -560,7 +565,8 @@ bool acpi_dev_resource_interrupt(struct acpi_resource *ares, int index,
 		if (is_gsi(ext_irq))
 			acpi_dev_get_irqresource(res, ext_irq->interrupts[index],
 					 ext_irq->triggering, ext_irq->polarity,
-					 ext_irq->shareable, false);
+					 ext_irq->shareable, ext_irq->wake_capable,
+					 false);
 		else
 			irqresource_disabled(res, 0);
 		break;

drivers/acpi/sleep.c

@@ -1088,6 +1088,14 @@ int __init acpi_sleep_init(void)
 		register_sys_off_handler(SYS_OFF_MODE_POWER_OFF,
 					 SYS_OFF_PRIO_FIRMWARE,
 					 acpi_power_off, NULL);
+
+		/*
+		 * Windows uses S5 for reboot, so some BIOSes depend on it to
+		 * perform proper reboot.
+		 */
+		register_sys_off_handler(SYS_OFF_MODE_RESTART_PREPARE,
+					 SYS_OFF_PRIO_FIRMWARE,
+					 acpi_power_off_prepare, NULL);
 	} else {
 		acpi_no_s5 = true;
 	}

drivers/gpio/gpiolib-acpi.c

@@ -741,6 +741,7 @@ static int acpi_populate_gpio_lookup(struct acpi_resource *ares, void *data)
 		lookup->info.pin_config = agpio->pin_config;
 		lookup->info.debounce = agpio->debounce_timeout;
 		lookup->info.gpioint = gpioint;
+		lookup->info.wake_capable = agpio->wake_capable == ACPI_WAKE_CAPABLE;
 
 		/*
 		 * Polarity and triggering are only specified for GpioInt
@@ -987,10 +988,11 @@ struct gpio_desc *acpi_node_get_gpiod(struct fwnode_handle *fwnode,
 }
 
 /**
- * acpi_dev_gpio_irq_get_by() - Find GpioInt and translate it to Linux IRQ number
+ * acpi_dev_gpio_irq_wake_get_by() - Find GpioInt and translate it to Linux IRQ number
  * @adev: pointer to a ACPI device to get IRQ from
  * @name: optional name of GpioInt resource
  * @index: index of GpioInt resource (starting from %0)
+ * @wake_capable: Set to true if the IRQ is wake capable
  *
  * If the device has one or more GpioInt resources, this function can be
  * used to translate from the GPIO offset in the resource to the Linux IRQ
@@ -1002,9 +1004,13 @@ struct gpio_desc *acpi_node_get_gpiod(struct fwnode_handle *fwnode,
  * The function takes optional @name parameter. If the resource has a property
  * name, then only those will be taken into account.
  *
+ * The GPIO is considered wake capable if the GpioInt resource specifies
+ * SharedAndWake or ExclusiveAndWake.
+ *
  * Return: Linux IRQ number (> %0) on success, negative errno on failure.
  */
-int acpi_dev_gpio_irq_get_by(struct acpi_device *adev, const char *name, int index)
+int acpi_dev_gpio_irq_wake_get_by(struct acpi_device *adev, const char *name, int index,
+				  bool *wake_capable)
 {
 	int idx, i;
 	unsigned int irq_flags;
@@ -1061,13 +1067,16 @@ int acpi_dev_gpio_irq_get_by(struct acpi_device *adev, const char *name, int ind
 				dev_dbg(&adev->dev, "IRQ %d already in use\n", irq);
 			}
 
+			if (wake_capable)
+				*wake_capable = info.wake_capable;
+
 			return irq;
 		}
 
 	}
 	return -ENOENT;
 }
-EXPORT_SYMBOL_GPL(acpi_dev_gpio_irq_get_by);
+EXPORT_SYMBOL_GPL(acpi_dev_gpio_irq_wake_get_by);
 
 static acpi_status
 acpi_gpio_adr_space_handler(u32 function, acpi_physical_address address,

drivers/gpio/gpiolib-acpi.h

@@ -18,6 +18,7 @@ struct acpi_device;
  * @pin_config: pin bias as provided by ACPI
  * @polarity: interrupt polarity as provided by ACPI
  * @triggering: triggering type as provided by ACPI
+ * @wake_capable: wake capability as provided by ACPI
  * @debounce: debounce timeout as provided by ACPI
  * @quirks: Linux specific quirks as provided by struct acpi_gpio_mapping
  */
@@ -28,6 +29,7 @@ struct acpi_gpio_info {
 	int pin_config;
 	int polarity;
 	int triggering;
+	bool wake_capable;
 	unsigned int debounce;
 	unsigned int quirks;
 };

drivers/i2c/i2c-core-acpi.c

@@ -137,6 +137,11 @@ static const struct acpi_device_id i2c_acpi_ignored_device_ids[] = {
 	{}
 };
 
+struct i2c_acpi_irq_context {
+	int irq;
+	bool wake_capable;
+};
+
 static int i2c_acpi_do_lookup(struct acpi_device *adev,
 			      struct i2c_acpi_lookup *lookup)
 {
@@ -168,13 +173,19 @@ static int i2c_acpi_do_lookup(struct acpi_device *adev,
 	return 0;
 }
 
-static int i2c_acpi_add_resource(struct acpi_resource *ares, void *data)
+static int i2c_acpi_add_irq_resource(struct acpi_resource *ares, void *data)
 {
-	int *irq = data;
+	struct i2c_acpi_irq_context *irq_ctx = data;
 	struct resource r;
 
-	if (*irq <= 0 && acpi_dev_resource_interrupt(ares, 0, &r))
-		*irq = i2c_dev_irq_from_resources(&r, 1);
+	if (irq_ctx->irq > 0)
+		return 1;
+
+	if (!acpi_dev_resource_interrupt(ares, 0, &r))
+		return 1;
+
+	irq_ctx->irq = i2c_dev_irq_from_resources(&r, 1);
+	irq_ctx->wake_capable = r.flags & IORESOURCE_IRQ_WAKECAPABLE;
 
 	return 1; /* No need to add resource to the list */
 }
@@ -182,31 +193,40 @@ static int i2c_acpi_add_resource(struct acpi_resource *ares, void *data)
 /**
  * i2c_acpi_get_irq - get device IRQ number from ACPI
  * @client: Pointer to the I2C client device
+ * @wake_capable: Set to true if the IRQ is wake capable
  *
  * Find the IRQ number used by a specific client device.
  *
  * Return: The IRQ number or an error code.
  */
-int i2c_acpi_get_irq(struct i2c_client *client)
+int i2c_acpi_get_irq(struct i2c_client *client, bool *wake_capable)
 {
 	struct acpi_device *adev = ACPI_COMPANION(&client->dev);
 	struct list_head resource_list;
-	int irq = -ENOENT;
+	struct i2c_acpi_irq_context irq_ctx = {
+		.irq = -ENOENT,
+	};
 	int ret;
 
 	INIT_LIST_HEAD(&resource_list);
 
 	ret = acpi_dev_get_resources(adev, &resource_list,
-				     i2c_acpi_add_resource, &irq);
+				     i2c_acpi_add_irq_resource, &irq_ctx);
 	if (ret < 0)
 		return ret;
 
 	acpi_dev_free_resource_list(&resource_list);
 
-	if (irq == -ENOENT)
-		irq = acpi_dev_gpio_irq_get(adev, 0);
+	if (irq_ctx.irq == -ENOENT)
+		irq_ctx.irq = acpi_dev_gpio_irq_wake_get(adev, 0, &irq_ctx.wake_capable);
+
+	if (irq_ctx.irq < 0)
+		return irq_ctx.irq;
+
+	if (wake_capable)
+		*wake_capable = irq_ctx.wake_capable;
 
-	return irq;
+	return irq_ctx.irq;
 }
 
 static int i2c_acpi_get_info(struct acpi_device *adev,

drivers/i2c/i2c-core-base.c

@@ -487,7 +487,11 @@ static int i2c_device_probe(struct device *dev)
 			if (irq == -EINVAL || irq == -ENODATA)
 				irq = of_irq_get(dev->of_node, 0);
 		} else if (ACPI_COMPANION(dev)) {
-			irq = i2c_acpi_get_irq(client);
+			bool wake_capable;
+
+			irq = i2c_acpi_get_irq(client, &wake_capable);
+			if (irq > 0 && wake_capable)
+				client->flags |= I2C_CLIENT_WAKE;
 		}
 		if (irq == -EPROBE_DEFER) {
 			status = irq;

drivers/i2c/i2c-core.h

@@ -61,11 +61,11 @@ static inline int __i2c_check_suspended(struct i2c_adapter *adap)
 #ifdef CONFIG_ACPI
 void i2c_acpi_register_devices(struct i2c_adapter *adap);
 
-int i2c_acpi_get_irq(struct i2c_client *client);
+int i2c_acpi_get_irq(struct i2c_client *client, bool *wake_capable);
 #else /* CONFIG_ACPI */
 static inline void i2c_acpi_register_devices(struct i2c_adapter *adap) { }
 
-static inline int i2c_acpi_get_irq(struct i2c_client *client)
+static inline int i2c_acpi_get_irq(struct i2c_client *client, bool *wake_capable)
 {
 	return 0;
 }

drivers/pnp/pnpacpi/rsparser.c

@@ -206,7 +206,8 @@ static acpi_status pnpacpi_allocated_resource(struct acpi_resource *res,
 		if (i >= 0) {
 			flags = acpi_dev_irq_flags(gpio->triggering,
 						   gpio->polarity,
-						   gpio->shareable);
+						   gpio->shareable,
+						   gpio->wake_capable);
 		} else {
 			flags = IORESOURCE_DISABLED;
 		}
@@ -315,7 +316,7 @@ static __init void pnpacpi_parse_irq_option(struct pnp_dev *dev,
 		if (p->interrupts[i])
 			__set_bit(p->interrupts[i], map.bits);
 
-	flags = acpi_dev_irq_flags(p->triggering, p->polarity, p->shareable);
+	flags = acpi_dev_irq_flags(p->triggering, p->polarity, p->shareable, p->wake_capable);
 	pnp_register_irq_resource(dev, option_flags, &map, flags);
 }
 
@@ -339,7 +340,7 @@ static __init void pnpacpi_parse_ext_irq_option(struct pnp_dev *dev,
 		}
 	}
 
-	flags = acpi_dev_irq_flags(p->triggering, p->polarity, p->shareable);
+	flags = acpi_dev_irq_flags(p->triggering, p->polarity, p->shareable, p->wake_capable);
 	pnp_register_irq_resource(dev, option_flags, &map, flags);
 }
 

include/linux/acpi.h

@@ -498,7 +498,7 @@ bool acpi_dev_resource_address_space(struct acpi_resource *ares,
 				     struct resource_win *win);
 bool acpi_dev_resource_ext_address_space(struct acpi_resource *ares,
 					 struct resource_win *win);
-unsigned long acpi_dev_irq_flags(u8 triggering, u8 polarity, u8 shareable);
+unsigned long acpi_dev_irq_flags(u8 triggering, u8 polarity, u8 shareable, u8 wake_capable);
 unsigned int acpi_dev_get_irq_type(int triggering, int polarity);
 bool acpi_dev_resource_interrupt(struct acpi_resource *ares, int index,
 				 struct resource *res);
@@ -1210,7 +1210,8 @@ bool acpi_gpio_get_irq_resource(struct acpi_resource *ares,
 				struct acpi_resource_gpio **agpio);
 bool acpi_gpio_get_io_resource(struct acpi_resource *ares,
 			       struct acpi_resource_gpio **agpio);
-int acpi_dev_gpio_irq_get_by(struct acpi_device *adev, const char *name, int index);
+int acpi_dev_gpio_irq_wake_get_by(struct acpi_device *adev, const char *name, int index,
+				  bool *wake_capable);
 #else
 static inline bool acpi_gpio_get_irq_resource(struct acpi_resource *ares,
 					      struct acpi_resource_gpio **agpio)
@@ -1222,16 +1223,28 @@ static inline bool acpi_gpio_get_io_resource(struct acpi_resource *ares,
 {
 	return false;
 }
-static inline int acpi_dev_gpio_irq_get_by(struct acpi_device *adev,
-					   const char *name, int index)
+static inline int acpi_dev_gpio_irq_wake_get_by(struct acpi_device *adev, const char *name,
+						int index, bool *wake_capable)
 {
 	return -ENXIO;
 }
 #endif
 
+static inline int acpi_dev_gpio_irq_wake_get(struct acpi_device *adev, int index,
+					     bool *wake_capable)
+{
+	return acpi_dev_gpio_irq_wake_get_by(adev, NULL, index, wake_capable);
+}
+
+static inline int acpi_dev_gpio_irq_get_by(struct acpi_device *adev, const char *name,
+					   int index)
+{
+	return acpi_dev_gpio_irq_wake_get_by(adev, name, index, NULL);
+}
+
 static inline int acpi_dev_gpio_irq_get(struct acpi_device *adev, int index)
 {
-	return acpi_dev_gpio_irq_get_by(adev, NULL, index);
+	return acpi_dev_gpio_irq_wake_get_by(adev, NULL, index, NULL);
 }
 
 /* Device properties */

include/linux/ioport.h

@@ -80,6 +80,7 @@ struct resource {
 #define IORESOURCE_IRQ_LOWLEVEL		(1<<3)
 #define IORESOURCE_IRQ_SHAREABLE	(1<<4)
 #define IORESOURCE_IRQ_OPTIONAL		(1<<5)
+#define IORESOURCE_IRQ_WAKECAPABLE	(1<<6)
 
 /* PnP DMA specific bits (IORESOURCE_BITS) */
 #define IORESOURCE_DMA_TYPE_MASK	(3<<0)

include/linux/reboot.h

@@ -105,6 +105,14 @@ enum sys_off_mode {
 	 */
 	SYS_OFF_MODE_POWER_OFF,
 
+	/**
+	 * @SYS_OFF_MODE_RESTART_PREPARE:
+	 *
+	 * Handlers prepare system to be restarted. Handlers are
+	 * allowed to sleep.
+	 */
+	SYS_OFF_MODE_RESTART_PREPARE,
+
 	/**
 	 * @SYS_OFF_MODE_RESTART:
 	 *

kernel/reboot.c

@@ -243,6 +243,17 @@ void migrate_to_reboot_cpu(void)
 	set_cpus_allowed_ptr(current, cpumask_of(cpu));
 }
 
+/*
+ *	Notifier list for kernel code which wants to be called
+ *	to prepare system for restart.
+ */
+static BLOCKING_NOTIFIER_HEAD(restart_prep_handler_list);
+
+static void do_kernel_restart_prepare(void)
+{
+	blocking_notifier_call_chain(&restart_prep_handler_list, 0, NULL);
+}
+
 /**
  *	kernel_restart - reboot the system
  *	@cmd: pointer to buffer containing command to execute for restart
@@ -254,6 +265,7 @@ void migrate_to_reboot_cpu(void)
 void kernel_restart(char *cmd)
 {
 	kernel_restart_prepare(cmd);
+	do_kernel_restart_prepare();
 	migrate_to_reboot_cpu();
 	syscore_shutdown();
 	if (!cmd)
@@ -396,6 +408,11 @@ register_sys_off_handler(enum sys_off_mode mode,
 		handler->list = &power_off_handler_list;
 		break;
 
+	case SYS_OFF_MODE_RESTART_PREPARE:
+		handler->list = &restart_prep_handler_list;
+		handler->blocking = true;
+		break;
+
 	case SYS_OFF_MODE_RESTART:
 		handler->list = &restart_handler_list;
 		break;