diff options
Diffstat (limited to 'drivers/acpi/scan.c')
| -rw-r--r-- | drivers/acpi/scan.c | 3132 |
1 files changed, 1905 insertions, 1227 deletions
diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c index 10985573aaa7..416d87f9bd10 100644 --- a/drivers/acpi/scan.c +++ b/drivers/acpi/scan.c @@ -1,51 +1,54 @@ +// SPDX-License-Identifier: GPL-2.0-only /* * scan.c - support for transforming the ACPI namespace into individual objects */ +#define pr_fmt(fmt) "ACPI: " fmt + #include <linux/module.h> #include <linux/init.h> #include <linux/slab.h> #include <linux/kernel.h> #include <linux/acpi.h> +#include <linux/acpi_iort.h> +#include <linux/acpi_rimt.h> +#include <linux/acpi_viot.h> +#include <linux/iommu.h> #include <linux/signal.h> #include <linux/kthread.h> #include <linux/dmi.h> -#include <linux/nls.h> - -#include <acpi/acpi_drivers.h> +#include <linux/dma-map-ops.h> +#include <linux/platform_data/x86/apple.h> +#include <linux/pgtable.h> +#include <linux/crc32.h> +#include <linux/dma-direct.h> #include "internal.h" - -#define _COMPONENT ACPI_BUS_COMPONENT -ACPI_MODULE_NAME("scan"); -#define STRUCT_TO_INT(s) (*((int*)&s)) -extern struct acpi_device *acpi_root; +#include "sleep.h" #define ACPI_BUS_CLASS "system_bus" #define ACPI_BUS_HID "LNXSYBUS" #define ACPI_BUS_DEVICE_NAME "System Bus" -#define ACPI_IS_ROOT_DEVICE(device) (!(device)->parent) - -/* - * If set, devices will be hot-removed even if they cannot be put offline - * gracefully (from the kernel's standpoint). - */ -bool acpi_force_hot_remove; +#define INVALID_ACPI_HANDLE ((acpi_handle)ZERO_PAGE(0)) static const char *dummy_hid = "device"; -static LIST_HEAD(acpi_bus_id_list); +static LIST_HEAD(acpi_dep_list); +static DEFINE_MUTEX(acpi_dep_list_lock); +LIST_HEAD(acpi_bus_id_list); static DEFINE_MUTEX(acpi_scan_lock); static LIST_HEAD(acpi_scan_handlers_list); DEFINE_MUTEX(acpi_device_lock); LIST_HEAD(acpi_wakeup_device_list); +static DEFINE_MUTEX(acpi_hp_context_lock); -struct acpi_device_bus_id{ - char bus_id[15]; - unsigned int instance_no; - struct list_head node; -}; +/* + * The UART device described by the SPCR table is the only object which needs + * special-casing. Everything else is covered by ACPI namespace paths in STAO + * table. + */ +static u64 spcr_uart_addr; void acpi_scan_lock_acquire(void) { @@ -59,9 +62,31 @@ void acpi_scan_lock_release(void) } EXPORT_SYMBOL_GPL(acpi_scan_lock_release); +void acpi_lock_hp_context(void) +{ + mutex_lock(&acpi_hp_context_lock); +} + +void acpi_unlock_hp_context(void) +{ + mutex_unlock(&acpi_hp_context_lock); +} + +void acpi_initialize_hp_context(struct acpi_device *adev, + struct acpi_hotplug_context *hp, + acpi_hp_notify notify, acpi_hp_uevent uevent) +{ + acpi_lock_hp_context(); + hp->notify = notify; + hp->uevent = uevent; + acpi_set_hp_context(adev, hp); + acpi_unlock_hp_context(); +} +EXPORT_SYMBOL_GPL(acpi_initialize_hp_context); + int acpi_scan_add_handler(struct acpi_scan_handler *handler) { - if (!handler || !handler->attach) + if (!handler) return -EINVAL; list_add_tail(&handler->list_node, &acpi_scan_handlers_list); @@ -81,61 +106,47 @@ int acpi_scan_add_handler_with_hotplug(struct acpi_scan_handler *handler, return 0; } -/* - * Creates hid/cid(s) string needed for modalias and uevent - * e.g. on a device with hid:IBM0001 and cid:ACPI0001 you get: - * char *modalias: "acpi:IBM0001:ACPI0001" -*/ -static int create_modalias(struct acpi_device *acpi_dev, char *modalias, - int size) -{ - int len; - int count; - struct acpi_hardware_id *id; - - if (list_empty(&acpi_dev->pnp.ids)) - return 0; - - len = snprintf(modalias, size, "acpi:"); - size -= len; +bool acpi_scan_is_offline(struct acpi_device *adev, bool uevent) +{ + struct acpi_device_physical_node *pn; + bool offline = true; + char *envp[] = { "EVENT=offline", NULL }; - list_for_each_entry(id, &acpi_dev->pnp.ids, list) { - count = snprintf(&modalias[len], size, "%s:", id->id); - if (count < 0 || count >= size) - return -EINVAL; - len += count; - size -= count; - } + /* + * acpi_container_offline() calls this for all of the container's + * children under the container's physical_node_lock lock. + */ + mutex_lock_nested(&adev->physical_node_lock, SINGLE_DEPTH_NESTING); - modalias[len] = '\0'; - return len; -} + list_for_each_entry(pn, &adev->physical_node_list, node) + if (device_supports_offline(pn->dev) && !pn->dev->offline) { + if (uevent) + kobject_uevent_env(&pn->dev->kobj, KOBJ_CHANGE, envp); -static ssize_t -acpi_device_modalias_show(struct device *dev, struct device_attribute *attr, char *buf) { - struct acpi_device *acpi_dev = to_acpi_device(dev); - int len; + offline = false; + break; + } - /* Device has no HID and no CID or string is >1024 */ - len = create_modalias(acpi_dev, buf, 1024); - if (len <= 0) - return 0; - buf[len++] = '\n'; - return len; + mutex_unlock(&adev->physical_node_lock); + return offline; } -static DEVICE_ATTR(modalias, 0444, acpi_device_modalias_show, NULL); -static acpi_status acpi_bus_offline_companions(acpi_handle handle, u32 lvl, - void *data, void **ret_p) +static acpi_status acpi_bus_offline(acpi_handle handle, u32 lvl, void *data, + void **ret_p) { - struct acpi_device *device = NULL; + struct acpi_device *device = acpi_fetch_acpi_dev(handle); struct acpi_device_physical_node *pn; bool second_pass = (bool)data; acpi_status status = AE_OK; - if (acpi_bus_get_device(handle, &device)) + if (!device) return AE_OK; + if (device->handler && !device->handler->hotplug.enabled) { + *ret_p = &device->dev; + return AE_SUPPORT; + } + mutex_lock(&device->physical_node_lock); list_for_each_entry(pn, &device->physical_node_list, node) { @@ -149,9 +160,6 @@ static acpi_status acpi_bus_offline_companions(acpi_handle handle, u32 lvl, pn->put_online = false; } ret = device_offline(pn->dev); - if (acpi_force_hot_remove) - continue; - if (ret >= 0) { pn->put_online = !ret; } else { @@ -168,13 +176,13 @@ static acpi_status acpi_bus_offline_companions(acpi_handle handle, u32 lvl, return status; } -static acpi_status acpi_bus_online_companions(acpi_handle handle, u32 lvl, - void *data, void **ret_p) +static acpi_status acpi_bus_online(acpi_handle handle, u32 lvl, void *data, + void **ret_p) { - struct acpi_device *device = NULL; + struct acpi_device *device = acpi_fetch_acpi_dev(handle); struct acpi_device_physical_node *pn; - if (acpi_bus_get_device(handle, &device)) + if (!device) return AE_OK; mutex_lock(&device->physical_node_lock); @@ -190,24 +198,11 @@ static acpi_status acpi_bus_online_companions(acpi_handle handle, u32 lvl, return AE_OK; } -static int acpi_scan_hot_remove(struct acpi_device *device) +static int acpi_scan_try_to_offline(struct acpi_device *device) { acpi_handle handle = device->handle; - acpi_handle not_used; - struct acpi_object_list arg_list; - union acpi_object arg; - struct device *errdev; + struct device *errdev = NULL; acpi_status status; - unsigned long long sta; - - /* If there is no handle, the device node has been unregistered. */ - if (!handle) { - dev_dbg(&device->dev, "ACPI handle missing\n"); - put_device(&device->dev); - return -EINVAL; - } - - lock_device_hotplug(); /* * Carry out two passes here and ignore errors in the first pass, @@ -218,72 +213,139 @@ static int acpi_scan_hot_remove(struct acpi_device *device) * * If the first pass is successful, the second one isn't needed, though. */ - errdev = NULL; - acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX, - NULL, acpi_bus_offline_companions, - (void *)false, (void **)&errdev); - acpi_bus_offline_companions(handle, 0, (void *)false, (void **)&errdev); + status = acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX, + NULL, acpi_bus_offline, (void *)false, + (void **)&errdev); + if (status == AE_SUPPORT) { + dev_warn(errdev, "Offline disabled.\n"); + acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX, + acpi_bus_online, NULL, NULL, NULL); + return -EPERM; + } + acpi_bus_offline(handle, 0, (void *)false, (void **)&errdev); if (errdev) { errdev = NULL; acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX, - NULL, acpi_bus_offline_companions, - (void *)true , (void **)&errdev); - if (!errdev || acpi_force_hot_remove) - acpi_bus_offline_companions(handle, 0, (void *)true, - (void **)&errdev); + NULL, acpi_bus_offline, (void *)true, + (void **)&errdev); + if (!errdev) + acpi_bus_offline(handle, 0, (void *)true, + (void **)&errdev); - if (errdev && !acpi_force_hot_remove) { + if (errdev) { dev_warn(errdev, "Offline failed.\n"); - acpi_bus_online_companions(handle, 0, NULL, NULL); + acpi_bus_online(handle, 0, NULL, NULL); acpi_walk_namespace(ACPI_TYPE_ANY, handle, - ACPI_UINT32_MAX, - acpi_bus_online_companions, NULL, - NULL, NULL); + ACPI_UINT32_MAX, acpi_bus_online, + NULL, NULL, NULL); + return -EBUSY; + } + } + return 0; +} - unlock_device_hotplug(); +#define ACPI_SCAN_CHECK_FLAG_STATUS BIT(0) +#define ACPI_SCAN_CHECK_FLAG_EJECT BIT(1) - put_device(&device->dev); - return -EBUSY; +static int acpi_scan_check_and_detach(struct acpi_device *adev, void *p) +{ + struct acpi_scan_handler *handler = adev->handler; + uintptr_t flags = (uintptr_t)p; + + acpi_dev_for_each_child_reverse(adev, acpi_scan_check_and_detach, p); + + if (flags & ACPI_SCAN_CHECK_FLAG_STATUS) { + acpi_bus_get_status(adev); + /* + * Skip devices that are still there and take the enabled + * flag into account. + */ + if (acpi_device_is_enabled(adev)) + return 0; + + /* Skip device that have not been enumerated. */ + if (!acpi_device_enumerated(adev)) { + dev_dbg(&adev->dev, "Still not enumerated\n"); + return 0; } } - ACPI_DEBUG_PRINT((ACPI_DB_INFO, - "Hot-removing device %s...\n", dev_name(&device->dev))); + adev->flags.match_driver = false; + if (handler) { + if (handler->detach) + handler->detach(adev); + } else { + device_release_driver(&adev->dev); + } + /* + * Most likely, the device is going away, so put it into D3cold before + * that. + */ + acpi_device_set_power(adev, ACPI_STATE_D3_COLD); + adev->flags.initialized = false; - acpi_bus_trim(device); + /* For eject this is deferred to acpi_bus_post_eject() */ + if (!(flags & ACPI_SCAN_CHECK_FLAG_EJECT)) { + adev->handler = NULL; + acpi_device_clear_enumerated(adev); + } + return 0; +} - unlock_device_hotplug(); +static int acpi_bus_post_eject(struct acpi_device *adev, void *not_used) +{ + struct acpi_scan_handler *handler = adev->handler; + + acpi_dev_for_each_child_reverse(adev, acpi_bus_post_eject, NULL); - /* Device node has been unregistered. */ - put_device(&device->dev); - device = NULL; + if (handler) { + if (handler->post_eject) + handler->post_eject(adev); - if (ACPI_SUCCESS(acpi_get_handle(handle, "_LCK", ¬_used))) { - arg_list.count = 1; - arg_list.pointer = &arg; - arg.type = ACPI_TYPE_INTEGER; - arg.integer.value = 0; - acpi_evaluate_object(handle, "_LCK", &arg_list, NULL); + adev->handler = NULL; } - arg_list.count = 1; - arg_list.pointer = &arg; - arg.type = ACPI_TYPE_INTEGER; - arg.integer.value = 1; + acpi_device_clear_enumerated(adev); + + return 0; +} + +static void acpi_scan_check_subtree(struct acpi_device *adev) +{ + uintptr_t flags = ACPI_SCAN_CHECK_FLAG_STATUS; + + acpi_scan_check_and_detach(adev, (void *)flags); +} + +static int acpi_scan_hot_remove(struct acpi_device *device) +{ + acpi_handle handle = device->handle; + unsigned long long sta; + acpi_status status; + uintptr_t flags = ACPI_SCAN_CHECK_FLAG_EJECT; + if (device->handler && device->handler->hotplug.demand_offline) { + if (!acpi_scan_is_offline(device, true)) + return -EBUSY; + } else { + int error = acpi_scan_try_to_offline(device); + if (error) + return error; + } + + acpi_handle_debug(handle, "Ejecting\n"); + + acpi_scan_check_and_detach(device, (void *)flags); + + acpi_evaluate_lck(handle, 0); /* * TBD: _EJD support. */ - status = acpi_evaluate_object(handle, "_EJ0", &arg_list, NULL); - if (ACPI_FAILURE(status)) { - if (status == AE_NOT_FOUND) { - return -ENODEV; - } else { - acpi_handle_warn(handle, "Eject failed (0x%x)\n", - status); - return -EIO; - } - } + status = acpi_evaluate_ej0(handle); + if (status == AE_NOT_FOUND) + return -ENODEV; + else if (ACPI_FAILURE(status)) + return -EIO; /* * Verify if eject was indeed successful. If not, log an error @@ -296,878 +358,518 @@ static int acpi_scan_hot_remove(struct acpi_device *device) } else if (sta & ACPI_STA_DEVICE_ENABLED) { acpi_handle_warn(handle, "Eject incomplete - status 0x%llx\n", sta); + } else { + acpi_bus_post_eject(device, NULL); } return 0; } -static void acpi_bus_device_eject(void *context) +static int acpi_scan_rescan_bus(struct acpi_device *adev) { - acpi_handle handle = context; - struct acpi_device *device = NULL; - struct acpi_scan_handler *handler; - u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE; - - mutex_lock(&acpi_scan_lock); - - acpi_bus_get_device(handle, &device); - if (!device) - goto err_out; - - handler = device->handler; - if (!handler || !handler->hotplug.enabled) { - ost_code = ACPI_OST_SC_EJECT_NOT_SUPPORTED; - goto err_out; - } - acpi_evaluate_hotplug_ost(handle, ACPI_NOTIFY_EJECT_REQUEST, - ACPI_OST_SC_EJECT_IN_PROGRESS, NULL); - if (handler->hotplug.mode == AHM_CONTAINER) { - device->flags.eject_pending = true; - kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE); - } else { - int error; + struct acpi_scan_handler *handler = adev->handler; + int ret; - get_device(&device->dev); - error = acpi_scan_hot_remove(device); - if (error) - goto err_out; - } + if (handler && handler->hotplug.scan_dependent) + ret = handler->hotplug.scan_dependent(adev); + else + ret = acpi_bus_scan(adev->handle); - out: - mutex_unlock(&acpi_scan_lock); - return; + if (ret) + dev_info(&adev->dev, "Namespace scan failure\n"); - err_out: - acpi_evaluate_hotplug_ost(handle, ACPI_NOTIFY_EJECT_REQUEST, ost_code, - NULL); - goto out; + return ret; } -static void acpi_scan_bus_device_check(acpi_handle handle, u32 ost_source) +static int acpi_scan_device_check(struct acpi_device *adev) { - struct acpi_device *device = NULL; - u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE; - int error; + struct acpi_device *parent; - mutex_lock(&acpi_scan_lock); - lock_device_hotplug(); + acpi_scan_check_subtree(adev); - acpi_bus_get_device(handle, &device); - if (device) { - dev_warn(&device->dev, "Attempt to re-insert\n"); - goto out; - } - acpi_evaluate_hotplug_ost(handle, ost_source, - ACPI_OST_SC_INSERT_IN_PROGRESS, NULL); - error = acpi_bus_scan(handle); - if (error) { - acpi_handle_warn(handle, "Namespace scan failure\n"); - goto out; - } - error = acpi_bus_get_device(handle, &device); - if (error) { - acpi_handle_warn(handle, "Missing device node object\n"); - goto out; + if (!acpi_device_is_present(adev)) + return 0; + + /* + * This function is only called for device objects for which matching + * scan handlers exist. The only situation in which the scan handler + * is not attached to this device object yet is when the device has + * just appeared (either it wasn't present at all before or it was + * removed and then added again). + */ + if (adev->handler) { + dev_dbg(&adev->dev, "Already enumerated\n"); + return 0; } - ost_code = ACPI_OST_SC_SUCCESS; - if (device->handler && device->handler->hotplug.mode == AHM_CONTAINER) - kobject_uevent(&device->dev.kobj, KOBJ_ONLINE); - out: - unlock_device_hotplug(); - acpi_evaluate_hotplug_ost(handle, ost_source, ost_code, NULL); - mutex_unlock(&acpi_scan_lock); -} + parent = acpi_dev_parent(adev); + if (!parent) + parent = adev; -static void acpi_scan_bus_check(void *context) -{ - acpi_scan_bus_device_check((acpi_handle)context, - ACPI_NOTIFY_BUS_CHECK); + return acpi_scan_rescan_bus(parent); } -static void acpi_scan_device_check(void *context) +static int acpi_scan_bus_check(struct acpi_device *adev) { - acpi_scan_bus_device_check((acpi_handle)context, - ACPI_NOTIFY_DEVICE_CHECK); + acpi_scan_check_subtree(adev); + + return acpi_scan_rescan_bus(adev); } -static void acpi_hotplug_unsupported(acpi_handle handle, u32 type) +static int acpi_generic_hotplug_event(struct acpi_device *adev, u32 type) { - u32 ost_status; - switch (type) { case ACPI_NOTIFY_BUS_CHECK: - acpi_handle_debug(handle, - "ACPI_NOTIFY_BUS_CHECK event: unsupported\n"); - ost_status = ACPI_OST_SC_INSERT_NOT_SUPPORTED; - break; + return acpi_scan_bus_check(adev); case ACPI_NOTIFY_DEVICE_CHECK: - acpi_handle_debug(handle, - "ACPI_NOTIFY_DEVICE_CHECK event: unsupported\n"); - ost_status = ACPI_OST_SC_INSERT_NOT_SUPPORTED; - break; + return acpi_scan_device_check(adev); case ACPI_NOTIFY_EJECT_REQUEST: - acpi_handle_debug(handle, - "ACPI_NOTIFY_EJECT_REQUEST event: unsupported\n"); - ost_status = ACPI_OST_SC_EJECT_NOT_SUPPORTED; - break; - default: - /* non-hotplug event; possibly handled by other handler */ - return; + case ACPI_OST_EC_OSPM_EJECT: + if (adev->handler && !adev->handler->hotplug.enabled) { + dev_info(&adev->dev, "Eject disabled\n"); + return -EPERM; + } + acpi_evaluate_ost(adev->handle, ACPI_NOTIFY_EJECT_REQUEST, + ACPI_OST_SC_EJECT_IN_PROGRESS, NULL); + return acpi_scan_hot_remove(adev); } - - acpi_evaluate_hotplug_ost(handle, type, ost_status, NULL); + return -EINVAL; } -static void acpi_hotplug_notify_cb(acpi_handle handle, u32 type, void *data) +void acpi_device_hotplug(struct acpi_device *adev, u32 src) { - acpi_osd_exec_callback callback; - struct acpi_scan_handler *handler = data; - acpi_status status; + u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE; + int error = -ENODEV; - if (!handler->hotplug.enabled) - return acpi_hotplug_unsupported(handle, type); + lock_device_hotplug(); + mutex_lock(&acpi_scan_lock); - switch (type) { - case ACPI_NOTIFY_BUS_CHECK: - acpi_handle_debug(handle, "ACPI_NOTIFY_BUS_CHECK event\n"); - callback = acpi_scan_bus_check; + /* + * The device object's ACPI handle cannot become invalid as long as we + * are holding acpi_scan_lock, but it might have become invalid before + * that lock was acquired. + */ + if (adev->handle == INVALID_ACPI_HANDLE) + goto err_out; + + if (adev->flags.is_dock_station) { + error = dock_notify(adev, src); + } else if (adev->flags.hotplug_notify) { + error = acpi_generic_hotplug_event(adev, src); + } else { + acpi_hp_notify notify; + + acpi_lock_hp_context(); + notify = adev->hp ? adev->hp->notify : NULL; + acpi_unlock_hp_context(); + /* + * There may be additional notify handlers for device objects + * without the .event() callback, so ignore them here. + */ + if (notify) + error = notify(adev, src); + else + goto out; + } + switch (error) { + case 0: + ost_code = ACPI_OST_SC_SUCCESS; break; - case ACPI_NOTIFY_DEVICE_CHECK: - acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK event\n"); - callback = acpi_scan_device_check; + case -EPERM: + ost_code = ACPI_OST_SC_EJECT_NOT_SUPPORTED; break; - case ACPI_NOTIFY_EJECT_REQUEST: - acpi_handle_debug(handle, "ACPI_NOTIFY_EJECT_REQUEST event\n"); - callback = acpi_bus_device_eject; + case -EBUSY: + ost_code = ACPI_OST_SC_DEVICE_BUSY; break; default: - /* non-hotplug event; possibly handled by other handler */ - return; + ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE; + break; } - status = acpi_os_hotplug_execute(callback, handle); - if (ACPI_FAILURE(status)) - acpi_evaluate_hotplug_ost(handle, type, - ACPI_OST_SC_NON_SPECIFIC_FAILURE, - NULL); -} -/** - * acpi_bus_hot_remove_device: hot-remove a device and its children - * @context: struct acpi_eject_event pointer (freed in this func) - * - * Hot-remove a device and its children. This function frees up the - * memory space passed by arg context, so that the caller may call - * this function asynchronously through acpi_os_hotplug_execute(). - */ -void acpi_bus_hot_remove_device(void *context) -{ - struct acpi_eject_event *ej_event = context; - struct acpi_device *device = ej_event->device; - acpi_handle handle = device->handle; - int error; - - mutex_lock(&acpi_scan_lock); - - error = acpi_scan_hot_remove(device); - if (error && handle) - acpi_evaluate_hotplug_ost(handle, ej_event->event, - ACPI_OST_SC_NON_SPECIFIC_FAILURE, - NULL); + err_out: + acpi_evaluate_ost(adev->handle, src, ost_code, NULL); + out: + acpi_put_acpi_dev(adev); mutex_unlock(&acpi_scan_lock); - kfree(context); -} -EXPORT_SYMBOL(acpi_bus_hot_remove_device); - -static ssize_t real_power_state_show(struct device *dev, - struct device_attribute *attr, char *buf) -{ - struct acpi_device *adev = to_acpi_device(dev); - int state; - int ret; - - ret = acpi_device_get_power(adev, &state); - if (ret) - return ret; - - return sprintf(buf, "%s\n", acpi_power_state_string(state)); -} - -static DEVICE_ATTR(real_power_state, 0444, real_power_state_show, NULL); - -static ssize_t power_state_show(struct device *dev, - struct device_attribute *attr, char *buf) -{ - struct acpi_device *adev = to_acpi_device(dev); - - return sprintf(buf, "%s\n", acpi_power_state_string(adev->power.state)); + unlock_device_hotplug(); } -static DEVICE_ATTR(power_state, 0444, power_state_show, NULL); - -static ssize_t -acpi_eject_store(struct device *d, struct device_attribute *attr, - const char *buf, size_t count) +static void acpi_free_power_resources_lists(struct acpi_device *device) { - struct acpi_device *acpi_device = to_acpi_device(d); - struct acpi_eject_event *ej_event; - acpi_object_type not_used; - acpi_status status; - u32 ost_source; - int ret; - - if (!count || buf[0] != '1') - return -EINVAL; - - if ((!acpi_device->handler || !acpi_device->handler->hotplug.enabled) - && !acpi_device->driver) - return -ENODEV; + int i; - status = acpi_get_type(acpi_device->handle, ¬_used); - if (ACPI_FAILURE(status) || !acpi_device->flags.ejectable) - return -ENODEV; + if (device->wakeup.flags.valid) + acpi_power_resources_list_free(&device->wakeup.resources); - mutex_lock(&acpi_scan_lock); + if (!device->power.flags.power_resources) + return; - if (acpi_device->flags.eject_pending) { - /* ACPI eject notification event. */ - ost_source = ACPI_NOTIFY_EJECT_REQUEST; - acpi_device->flags.eject_pending = 0; - } else { - /* Eject initiated by user space. */ - ost_source = ACPI_OST_EC_OSPM_EJECT; - } - ej_event = kmalloc(sizeof(*ej_event), GFP_KERNEL); - if (!ej_event) { - ret = -ENOMEM; - goto err_out; - } - acpi_evaluate_hotplug_ost(acpi_device->handle, ost_source, - ACPI_OST_SC_EJECT_IN_PROGRESS, NULL); - ej_event->device = acpi_device; - ej_event->event = ost_source; - get_device(&acpi_device->dev); - status = acpi_os_hotplug_execute(acpi_bus_hot_remove_device, ej_event); - if (ACPI_FAILURE(status)) { - put_device(&acpi_device->dev); - kfree(ej_event); - ret = status == AE_NO_MEMORY ? -ENOMEM : -EAGAIN; - goto err_out; + for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) { + struct acpi_device_power_state *ps = &device->power.states[i]; + acpi_power_resources_list_free(&ps->resources); } - ret = count; - - out: - mutex_unlock(&acpi_scan_lock); - return ret; - - err_out: - acpi_evaluate_hotplug_ost(acpi_device->handle, ost_source, - ACPI_OST_SC_NON_SPECIFIC_FAILURE, NULL); - goto out; } -static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store); - -static ssize_t -acpi_device_hid_show(struct device *dev, struct device_attribute *attr, char *buf) { - struct acpi_device *acpi_dev = to_acpi_device(dev); - - return sprintf(buf, "%s\n", acpi_device_hid(acpi_dev)); -} -static DEVICE_ATTR(hid, 0444, acpi_device_hid_show, NULL); - -static ssize_t acpi_device_uid_show(struct device *dev, - struct device_attribute *attr, char *buf) +static void acpi_device_release(struct device *dev) { struct acpi_device *acpi_dev = to_acpi_device(dev); - return sprintf(buf, "%s\n", acpi_dev->pnp.unique_id); + acpi_free_properties(acpi_dev); + acpi_free_pnp_ids(&acpi_dev->pnp); + acpi_free_power_resources_lists(acpi_dev); + kfree(acpi_dev); } -static DEVICE_ATTR(uid, 0444, acpi_device_uid_show, NULL); -static ssize_t acpi_device_adr_show(struct device *dev, - struct device_attribute *attr, char *buf) +static void acpi_device_del(struct acpi_device *device) { - struct acpi_device *acpi_dev = to_acpi_device(dev); - - return sprintf(buf, "0x%08x\n", - (unsigned int)(acpi_dev->pnp.bus_address)); -} -static DEVICE_ATTR(adr, 0444, acpi_device_adr_show, NULL); - -static ssize_t -acpi_device_path_show(struct device *dev, struct device_attribute *attr, char *buf) { - struct acpi_device *acpi_dev = to_acpi_device(dev); - struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL}; - int result; - - result = acpi_get_name(acpi_dev->handle, ACPI_FULL_PATHNAME, &path); - if (result) - goto end; + struct acpi_device_bus_id *acpi_device_bus_id; - result = sprintf(buf, "%s\n", (char*)path.pointer); - kfree(path.pointer); -end: - return result; -} -static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL); + mutex_lock(&acpi_device_lock); -/* sysfs file that shows description text from the ACPI _STR method */ -static ssize_t description_show(struct device *dev, - struct device_attribute *attr, - char *buf) { - struct acpi_device *acpi_dev = to_acpi_device(dev); - int result; + list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) + if (!strcmp(acpi_device_bus_id->bus_id, + acpi_device_hid(device))) { + ida_free(&acpi_device_bus_id->instance_ida, + device->pnp.instance_no); + if (ida_is_empty(&acpi_device_bus_id->instance_ida)) { + list_del(&acpi_device_bus_id->node); + kfree_const(acpi_device_bus_id->bus_id); + kfree(acpi_device_bus_id); + } + break; + } - if (acpi_dev->pnp.str_obj == NULL) - return 0; + list_del(&device->wakeup_list); - /* - * The _STR object contains a Unicode identifier for a device. - * We need to convert to utf-8 so it can be displayed. - */ - result = utf16s_to_utf8s( - (wchar_t *)acpi_dev->pnp.str_obj->buffer.pointer, - acpi_dev->pnp.str_obj->buffer.length, - UTF16_LITTLE_ENDIAN, buf, - PAGE_SIZE); + mutex_unlock(&acpi_device_lock); - buf[result++] = '\n'; + acpi_power_add_remove_device(device, false); + acpi_device_remove_files(device); + if (device->remove) + device->remove(device); - return result; + device_del(&device->dev); } -static DEVICE_ATTR(description, 0444, description_show, NULL); -static ssize_t -acpi_device_sun_show(struct device *dev, struct device_attribute *attr, - char *buf) { - struct acpi_device *acpi_dev = to_acpi_device(dev); +static BLOCKING_NOTIFIER_HEAD(acpi_reconfig_chain); - return sprintf(buf, "%lu\n", acpi_dev->pnp.sun); -} -static DEVICE_ATTR(sun, 0444, acpi_device_sun_show, NULL); +static LIST_HEAD(acpi_device_del_list); +static DEFINE_MUTEX(acpi_device_del_lock); -static int acpi_device_setup_files(struct acpi_device *dev) +static void acpi_device_del_work_fn(struct work_struct *work_not_used) { - struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL}; - acpi_status status; - acpi_handle temp; - unsigned long long sun; - int result = 0; + for (;;) { + struct acpi_device *adev; - /* - * Devices gotten from FADT don't have a "path" attribute - */ - if (dev->handle) { - result = device_create_file(&dev->dev, &dev_attr_path); - if (result) - goto end; - } - - if (!list_empty(&dev->pnp.ids)) { - result = device_create_file(&dev->dev, &dev_attr_hid); - if (result) - goto end; + mutex_lock(&acpi_device_del_lock); - result = device_create_file(&dev->dev, &dev_attr_modalias); - if (result) - goto end; - } - - /* - * If device has _STR, 'description' file is created - */ - status = acpi_get_handle(dev->handle, "_STR", &temp); - if (ACPI_SUCCESS(status)) { - status = acpi_evaluate_object(dev->handle, "_STR", - NULL, &buffer); - if (ACPI_FAILURE(status)) - buffer.pointer = NULL; - dev->pnp.str_obj = buffer.pointer; - result = device_create_file(&dev->dev, &dev_attr_description); - if (result) - goto end; - } - - if (dev->pnp.type.bus_address) - result = device_create_file(&dev->dev, &dev_attr_adr); - if (dev->pnp.unique_id) - result = device_create_file(&dev->dev, &dev_attr_uid); - - status = acpi_evaluate_integer(dev->handle, "_SUN", NULL, &sun); - if (ACPI_SUCCESS(status)) { - dev->pnp.sun = (unsigned long)sun; - result = device_create_file(&dev->dev, &dev_attr_sun); - if (result) - goto end; - } else { - dev->pnp.sun = (unsigned long)-1; - } + if (list_empty(&acpi_device_del_list)) { + mutex_unlock(&acpi_device_del_lock); + break; + } + adev = list_first_entry(&acpi_device_del_list, + struct acpi_device, del_list); + list_del(&adev->del_list); - /* - * If device has _EJ0, 'eject' file is created that is used to trigger - * hot-removal function from userland. - */ - status = acpi_get_handle(dev->handle, "_EJ0", &temp); - if (ACPI_SUCCESS(status)) { - result = device_create_file(&dev->dev, &dev_attr_eject); - if (result) - return result; - } + mutex_unlock(&acpi_device_del_lock); - if (dev->flags.power_manageable) { - result = device_create_file(&dev->dev, &dev_attr_power_state); - if (result) - return result; + blocking_notifier_call_chain(&acpi_reconfig_chain, + ACPI_RECONFIG_DEVICE_REMOVE, adev); - if (dev->power.flags.power_resources) - result = device_create_file(&dev->dev, - &dev_attr_real_power_state); + acpi_device_del(adev); + /* + * Drop references to all power resources that might have been + * used by the device. + */ + acpi_power_transition(adev, ACPI_STATE_D3_COLD); + acpi_dev_put(adev); } - -end: - return result; } -static void acpi_device_remove_files(struct acpi_device *dev) +/** + * acpi_scan_drop_device - Drop an ACPI device object. + * @handle: Handle of an ACPI namespace node, not used. + * @context: Address of the ACPI device object to drop. + * + * This is invoked by acpi_ns_delete_node() during the removal of the ACPI + * namespace node the device object pointed to by @context is attached to. + * + * The unregistration is carried out asynchronously to avoid running + * acpi_device_del() under the ACPICA's namespace mutex and the list is used to + * ensure the correct ordering (the device objects must be unregistered in the + * same order in which the corresponding namespace nodes are deleted). + */ +static void acpi_scan_drop_device(acpi_handle handle, void *context) { - acpi_status status; - acpi_handle temp; + static DECLARE_WORK(work, acpi_device_del_work_fn); + struct acpi_device *adev = context; - if (dev->flags.power_manageable) { - device_remove_file(&dev->dev, &dev_attr_power_state); - if (dev->power.flags.power_resources) - device_remove_file(&dev->dev, - &dev_attr_real_power_state); - } + mutex_lock(&acpi_device_del_lock); /* - * If device has _STR, remove 'description' file - */ - status = acpi_get_handle(dev->handle, "_STR", &temp); - if (ACPI_SUCCESS(status)) { - kfree(dev->pnp.str_obj); - device_remove_file(&dev->dev, &dev_attr_description); - } - /* - * If device has _EJ0, remove 'eject' file. + * Use the ACPI hotplug workqueue which is ordered, so this work item + * won't run after any hotplug work items submitted subsequently. That + * prevents attempts to register device objects identical to those being + * deleted from happening concurrently (such attempts result from + * hotplug events handled via the ACPI hotplug workqueue). It also will + * run after all of the work items submitted previously, which helps + * those work items to ensure that they are not accessing stale device + * objects. */ - status = acpi_get_handle(dev->handle, "_EJ0", &temp); - if (ACPI_SUCCESS(status)) - device_remove_file(&dev->dev, &dev_attr_eject); - - status = acpi_get_handle(dev->handle, "_SUN", &temp); - if (ACPI_SUCCESS(status)) - device_remove_file(&dev->dev, &dev_attr_sun); - - if (dev->pnp.unique_id) - device_remove_file(&dev->dev, &dev_attr_uid); - if (dev->pnp.type.bus_address) - device_remove_file(&dev->dev, &dev_attr_adr); - device_remove_file(&dev->dev, &dev_attr_modalias); - device_remove_file(&dev->dev, &dev_attr_hid); - if (dev->handle) - device_remove_file(&dev->dev, &dev_attr_path); + if (list_empty(&acpi_device_del_list)) + acpi_queue_hotplug_work(&work); + + list_add_tail(&adev->del_list, &acpi_device_del_list); + /* Make acpi_ns_validate_handle() return NULL for this handle. */ + adev->handle = INVALID_ACPI_HANDLE; + + mutex_unlock(&acpi_device_del_lock); } -/* -------------------------------------------------------------------------- - ACPI Bus operations - -------------------------------------------------------------------------- */ -static const struct acpi_device_id *__acpi_match_device( - struct acpi_device *device, const struct acpi_device_id *ids) +static struct acpi_device *handle_to_device(acpi_handle handle, + void (*callback)(void *)) { - const struct acpi_device_id *id; - struct acpi_hardware_id *hwid; + struct acpi_device *adev = NULL; + acpi_status status; - /* - * If the device is not present, it is unnecessary to load device - * driver for it. - */ - if (!device->status.present) + status = acpi_get_data_full(handle, acpi_scan_drop_device, + (void **)&adev, callback); + if (ACPI_FAILURE(status) || !adev) { + acpi_handle_debug(handle, "No context!\n"); return NULL; - - for (id = ids; id->id[0]; id++) - list_for_each_entry(hwid, &device->pnp.ids, list) - if (!strcmp((char *) id->id, hwid->id)) - return id; - - return NULL; + } + return adev; } /** - * acpi_match_device - Match a struct device against a given list of ACPI IDs - * @ids: Array of struct acpi_device_id object to match against. - * @dev: The device structure to match. - * - * Check if @dev has a valid ACPI handle and if there is a struct acpi_device - * object for that handle and use that object to match against a given list of - * device IDs. + * acpi_fetch_acpi_dev - Retrieve ACPI device object. + * @handle: ACPI handle associated with the requested ACPI device object. * - * Return a pointer to the first matching ID on success or %NULL on failure. + * Return a pointer to the ACPI device object associated with @handle, if + * present, or NULL otherwise. */ -const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids, - const struct device *dev) +struct acpi_device *acpi_fetch_acpi_dev(acpi_handle handle) { - struct acpi_device *adev; - acpi_handle handle = ACPI_HANDLE(dev); - - if (!ids || !handle || acpi_bus_get_device(handle, &adev)) - return NULL; - - return __acpi_match_device(adev, ids); + return handle_to_device(handle, NULL); } -EXPORT_SYMBOL_GPL(acpi_match_device); +EXPORT_SYMBOL_GPL(acpi_fetch_acpi_dev); -int acpi_match_device_ids(struct acpi_device *device, - const struct acpi_device_id *ids) +static void get_acpi_device(void *dev) { - return __acpi_match_device(device, ids) ? 0 : -ENOENT; + acpi_dev_get(dev); } -EXPORT_SYMBOL(acpi_match_device_ids); -static void acpi_free_power_resources_lists(struct acpi_device *device) +/** + * acpi_get_acpi_dev - Retrieve ACPI device object and reference count it. + * @handle: ACPI handle associated with the requested ACPI device object. + * + * Return a pointer to the ACPI device object associated with @handle and bump + * up that object's reference counter (under the ACPI Namespace lock), if + * present, or return NULL otherwise. + * + * The ACPI device object reference acquired by this function needs to be + * dropped via acpi_dev_put(). + */ +struct acpi_device *acpi_get_acpi_dev(acpi_handle handle) { - int i; - - if (device->wakeup.flags.valid) - acpi_power_resources_list_free(&device->wakeup.resources); - - if (!device->flags.power_manageable) - return; - - for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) { - struct acpi_device_power_state *ps = &device->power.states[i]; - acpi_power_resources_list_free(&ps->resources); - } + return handle_to_device(handle, get_acpi_device); } +EXPORT_SYMBOL_GPL(acpi_get_acpi_dev); -static void acpi_device_release(struct device *dev) +static struct acpi_device_bus_id *acpi_device_bus_id_match(const char *dev_id) { - struct acpi_device *acpi_dev = to_acpi_device(dev); - - acpi_free_pnp_ids(&acpi_dev->pnp); - acpi_free_power_resources_lists(acpi_dev); - kfree(acpi_dev); -} + struct acpi_device_bus_id *acpi_device_bus_id; -static int acpi_bus_match(struct device *dev, struct device_driver *drv) -{ - struct acpi_device *acpi_dev = to_acpi_device(dev); - struct acpi_driver *acpi_drv = to_acpi_driver(drv); - - return acpi_dev->flags.match_driver - && !acpi_match_device_ids(acpi_dev, acpi_drv->ids); + /* Find suitable bus_id and instance number in acpi_bus_id_list. */ + list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) { + if (!strcmp(acpi_device_bus_id->bus_id, dev_id)) + return acpi_device_bus_id; + } + return NULL; } -static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env) +static int acpi_device_set_name(struct acpi_device *device, + struct acpi_device_bus_id *acpi_device_bus_id) { - struct acpi_device *acpi_dev = to_acpi_device(dev); - int len; + struct ida *instance_ida = &acpi_device_bus_id->instance_ida; + int result; - if (list_empty(&acpi_dev->pnp.ids)) - return 0; + result = ida_alloc(instance_ida, GFP_KERNEL); + if (result < 0) + return result; - if (add_uevent_var(env, "MODALIAS=")) - return -ENOMEM; - len = create_modalias(acpi_dev, &env->buf[env->buflen - 1], - sizeof(env->buf) - env->buflen); - if (len >= (sizeof(env->buf) - env->buflen)) - return -ENOMEM; - env->buflen += len; + device->pnp.instance_no = result; + dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, result); return 0; } -static void acpi_device_notify(acpi_handle handle, u32 event, void *data) -{ - struct acpi_device *device = data; - - device->driver->ops.notify(device, event); -} - -static acpi_status acpi_device_notify_fixed(void *data) -{ - struct acpi_device *device = data; - - /* Fixed hardware devices have no handles */ - acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device); - return AE_OK; -} - -static int acpi_device_install_notify_handler(struct acpi_device *device) +int acpi_tie_acpi_dev(struct acpi_device *adev) { + acpi_handle handle = adev->handle; acpi_status status; - if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON) - status = - acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON, - acpi_device_notify_fixed, - device); - else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON) - status = - acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON, - acpi_device_notify_fixed, - device); - else - status = acpi_install_notify_handler(device->handle, - ACPI_DEVICE_NOTIFY, - acpi_device_notify, - device); - - if (ACPI_FAILURE(status)) - return -EINVAL; - return 0; -} - -static void acpi_device_remove_notify_handler(struct acpi_device *device) -{ - if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON) - acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON, - acpi_device_notify_fixed); - else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON) - acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON, - acpi_device_notify_fixed); - else - acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY, - acpi_device_notify); -} - -static int acpi_device_probe(struct device *dev) -{ - struct acpi_device *acpi_dev = to_acpi_device(dev); - struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver); - int ret; - - if (acpi_dev->handler) - return -EINVAL; - - if (!acpi_drv->ops.add) - return -ENOSYS; - - ret = acpi_drv->ops.add(acpi_dev); - if (ret) - return ret; - - acpi_dev->driver = acpi_drv; - ACPI_DEBUG_PRINT((ACPI_DB_INFO, - "Driver [%s] successfully bound to device [%s]\n", - acpi_drv->name, acpi_dev->pnp.bus_id)); - - if (acpi_drv->ops.notify) { - ret = acpi_device_install_notify_handler(acpi_dev); - if (ret) { - if (acpi_drv->ops.remove) - acpi_drv->ops.remove(acpi_dev); + if (!handle) + return 0; - acpi_dev->driver = NULL; - acpi_dev->driver_data = NULL; - return ret; - } + status = acpi_attach_data(handle, acpi_scan_drop_device, adev); + if (ACPI_FAILURE(status)) { + acpi_handle_err(handle, "Unable to attach device data\n"); + return -ENODEV; } - ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found driver [%s] for device [%s]\n", - acpi_drv->name, acpi_dev->pnp.bus_id)); - get_device(dev); return 0; } -static int acpi_device_remove(struct device * dev) +static void acpi_store_pld_crc(struct acpi_device *adev) { - struct acpi_device *acpi_dev = to_acpi_device(dev); - struct acpi_driver *acpi_drv = acpi_dev->driver; + struct acpi_pld_info *pld; - if (acpi_drv) { - if (acpi_drv->ops.notify) - acpi_device_remove_notify_handler(acpi_dev); - if (acpi_drv->ops.remove) - acpi_drv->ops.remove(acpi_dev); - } - acpi_dev->driver = NULL; - acpi_dev->driver_data = NULL; + if (!acpi_get_physical_device_location(adev->handle, &pld)) + return; - put_device(dev); - return 0; + adev->pld_crc = crc32(~0, pld, sizeof(*pld)); + ACPI_FREE(pld); } -struct bus_type acpi_bus_type = { - .name = "acpi", - .match = acpi_bus_match, - .probe = acpi_device_probe, - .remove = acpi_device_remove, - .uevent = acpi_device_uevent, -}; - -int acpi_device_add(struct acpi_device *device, - void (*release)(struct device *)) +int acpi_device_add(struct acpi_device *device) { + struct acpi_device_bus_id *acpi_device_bus_id; int result; - struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id; - int found = 0; - - if (device->handle) { - acpi_status status; - - status = acpi_attach_data(device->handle, acpi_bus_data_handler, - device); - if (ACPI_FAILURE(status)) { - acpi_handle_err(device->handle, - "Unable to attach device data\n"); - return -ENODEV; - } - } /* * Linkage * ------- * Link this device to its parent and siblings. */ - INIT_LIST_HEAD(&device->children); - INIT_LIST_HEAD(&device->node); INIT_LIST_HEAD(&device->wakeup_list); INIT_LIST_HEAD(&device->physical_node_list); + INIT_LIST_HEAD(&device->del_list); mutex_init(&device->physical_node_lock); - INIT_LIST_HEAD(&device->power_dependent); - - new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL); - if (!new_bus_id) { - pr_err(PREFIX "Memory allocation error\n"); - result = -ENOMEM; - goto err_detach; - } mutex_lock(&acpi_device_lock); - /* - * Find suitable bus_id and instance number in acpi_bus_id_list - * If failed, create one and link it into acpi_bus_id_list - */ - list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) { - if (!strcmp(acpi_device_bus_id->bus_id, - acpi_device_hid(device))) { - acpi_device_bus_id->instance_no++; - found = 1; - kfree(new_bus_id); - break; + + acpi_device_bus_id = acpi_device_bus_id_match(acpi_device_hid(device)); + if (acpi_device_bus_id) { + result = acpi_device_set_name(device, acpi_device_bus_id); + if (result) + goto err_unlock; + } else { + acpi_device_bus_id = kzalloc(sizeof(*acpi_device_bus_id), + GFP_KERNEL); + if (!acpi_device_bus_id) { + result = -ENOMEM; + goto err_unlock; } - } - if (!found) { - acpi_device_bus_id = new_bus_id; - strcpy(acpi_device_bus_id->bus_id, acpi_device_hid(device)); - acpi_device_bus_id->instance_no = 0; + acpi_device_bus_id->bus_id = + kstrdup_const(acpi_device_hid(device), GFP_KERNEL); + if (!acpi_device_bus_id->bus_id) { + kfree(acpi_device_bus_id); + result = -ENOMEM; + goto err_unlock; + } + + ida_init(&acpi_device_bus_id->instance_ida); + + result = acpi_device_set_name(device, acpi_device_bus_id); + if (result) { + kfree_const(acpi_device_bus_id->bus_id); + kfree(acpi_device_bus_id); + goto err_unlock; + } + list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list); } - dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no); - - if (device->parent) - list_add_tail(&device->node, &device->parent->children); if (device->wakeup.flags.valid) list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list); + + acpi_store_pld_crc(device); + mutex_unlock(&acpi_device_lock); - if (device->parent) - device->dev.parent = &device->parent->dev; - device->dev.bus = &acpi_bus_type; - device->dev.release = release; result = device_add(&device->dev); if (result) { dev_err(&device->dev, "Error registering device\n"); goto err; } - result = acpi_device_setup_files(device); - if (result) - printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n", - dev_name(&device->dev)); + acpi_device_setup_files(device); return 0; - err: +err: mutex_lock(&acpi_device_lock); - if (device->parent) - list_del(&device->node); - list_del(&device->wakeup_list); - mutex_unlock(&acpi_device_lock); - - err_detach: - acpi_detach_data(device->handle, acpi_bus_data_handler); - return result; -} - -static void acpi_device_unregister(struct acpi_device *device) -{ - mutex_lock(&acpi_device_lock); - if (device->parent) - list_del(&device->node); list_del(&device->wakeup_list); + +err_unlock: mutex_unlock(&acpi_device_lock); - acpi_detach_data(device->handle, acpi_bus_data_handler); + acpi_detach_data(device->handle, acpi_scan_drop_device); - acpi_power_add_remove_device(device, false); - acpi_device_remove_files(device); - if (device->remove) - device->remove(device); - - device_del(&device->dev); - /* - * Transition the device to D3cold to drop the reference counts of all - * power resources the device depends on and turn off the ones that have - * no more references. - */ - acpi_device_set_power(device, ACPI_STATE_D3_COLD); - device->handle = NULL; - put_device(&device->dev); + return result; } /* -------------------------------------------------------------------------- - Driver Management + Device Enumeration -------------------------------------------------------------------------- */ -/** - * acpi_bus_register_driver - register a driver with the ACPI bus - * @driver: driver being registered - * - * Registers a driver with the ACPI bus. Searches the namespace for all - * devices that match the driver's criteria and binds. Returns zero for - * success or a negative error status for failure. - */ -int acpi_bus_register_driver(struct acpi_driver *driver) +static bool acpi_info_matches_ids(struct acpi_device_info *info, + const char * const ids[]) { - int ret; + struct acpi_pnp_device_id_list *cid_list = NULL; + int i, index; - if (acpi_disabled) - return -ENODEV; - driver->drv.name = driver->name; - driver->drv.bus = &acpi_bus_type; - driver->drv.owner = driver->owner; + if (!(info->valid & ACPI_VALID_HID)) + return false; - ret = driver_register(&driver->drv); - return ret; -} + index = match_string(ids, -1, info->hardware_id.string); + if (index >= 0) + return true; -EXPORT_SYMBOL(acpi_bus_register_driver); + if (info->valid & ACPI_VALID_CID) + cid_list = &info->compatible_id_list; -/** - * acpi_bus_unregister_driver - unregisters a driver with the APIC bus - * @driver: driver to unregister - * - * Unregisters a driver with the ACPI bus. Searches the namespace for all - * devices that match the driver's criteria and unbinds. - */ -void acpi_bus_unregister_driver(struct acpi_driver *driver) -{ - driver_unregister(&driver->drv); + if (!cid_list) + return false; + + for (i = 0; i < cid_list->count; i++) { + index = match_string(ids, -1, cid_list->ids[i].string); + if (index >= 0) + return true; + } + + return false; } -EXPORT_SYMBOL(acpi_bus_unregister_driver); +/* List of HIDs for which we ignore matching ACPI devices, when checking _DEP lists. */ +static const char * const acpi_ignore_dep_ids[] = { + "PNP0D80", /* Windows-compatible System Power Management Controller */ + "INT33BD", /* Intel Baytrail Mailbox Device */ + "INTC10DE", /* Intel CVS LNL */ + "INTC10E0", /* Intel CVS ARL */ + "LATT2021", /* Lattice FW Update Client Driver */ + NULL +}; -/* -------------------------------------------------------------------------- - Device Enumeration - -------------------------------------------------------------------------- */ -static struct acpi_device *acpi_bus_get_parent(acpi_handle handle) +/* List of HIDs for which we honor deps of matching ACPI devs, when checking _DEP lists. */ +static const char * const acpi_honor_dep_ids[] = { + "INT3472", /* Camera sensor PMIC / clk and regulator info */ + "INTC1059", /* IVSC (TGL) driver must be loaded to allow i2c access to camera sensors */ + "INTC1095", /* IVSC (ADL) driver must be loaded to allow i2c access to camera sensors */ + "INTC100A", /* IVSC (RPL) driver must be loaded to allow i2c access to camera sensors */ + "INTC10CF", /* IVSC (MTL) driver must be loaded to allow i2c access to camera sensors */ + "RSCV0001", /* RISC-V PLIC */ + "RSCV0002", /* RISC-V APLIC */ + "RSCV0005", /* RISC-V SBI MPXY MBOX */ + "RSCV0006", /* RISC-V RPMI SYSMSI */ + "PNP0C0F", /* PCI Link Device */ + NULL +}; + +static struct acpi_device *acpi_find_parent_acpi_dev(acpi_handle handle) { - struct acpi_device *device = NULL; - acpi_status status; + struct acpi_device *adev; /* * Fixed hardware devices do not appear in the namespace and do not @@ -1178,11 +880,18 @@ static struct acpi_device *acpi_bus_get_parent(acpi_handle handle) return acpi_root; do { + acpi_status status; + status = acpi_get_parent(handle, &handle); - if (ACPI_FAILURE(status)) - return status == AE_NULL_ENTRY ? NULL : acpi_root; - } while (acpi_bus_get_device(handle, &device)); - return device; + if (ACPI_FAILURE(status)) { + if (status != AE_NULL_ENTRY) + return acpi_root; + + return NULL; + } + adev = acpi_fetch_acpi_dev(handle); + } while (!adev); + return adev; } acpi_status @@ -1208,32 +917,23 @@ acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd) } EXPORT_SYMBOL_GPL(acpi_bus_get_ejd); -void acpi_bus_data_handler(acpi_handle handle, void *context) -{ - - /* TBD */ - - return; -} - -static int acpi_bus_extract_wakeup_device_power_package(acpi_handle handle, - struct acpi_device_wakeup *wakeup) +static int acpi_bus_extract_wakeup_device_power_package(struct acpi_device *dev) { + acpi_handle handle = dev->handle; + struct acpi_device_wakeup *wakeup = &dev->wakeup; struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; union acpi_object *package = NULL; union acpi_object *element = NULL; acpi_status status; int err = -ENODATA; - if (!wakeup) - return -EINVAL; - INIT_LIST_HEAD(&wakeup->resources); /* _PRW */ status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer); if (ACPI_FAILURE(status)) { - ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW")); + acpi_handle_info(handle, "_PRW evaluation failed: %s\n", + acpi_format_exception(status)); return err; } @@ -1292,77 +992,71 @@ static int acpi_bus_extract_wakeup_device_power_package(acpi_handle handle, wakeup->sleep_state = sleep_state; } } - acpi_setup_gpe_for_wake(handle, wakeup->gpe_device, wakeup->gpe_number); out: kfree(buffer.pointer); return err; } -static void acpi_bus_set_run_wake_flags(struct acpi_device *device) +/* Do not use a button for S5 wakeup */ +#define ACPI_AVOID_WAKE_FROM_S5 BIT(0) + +static bool acpi_wakeup_gpe_init(struct acpi_device *device) { - struct acpi_device_id button_device_ids[] = { - {"PNP0C0C", 0}, - {"PNP0C0D", 0}, - {"PNP0C0E", 0}, + static const struct acpi_device_id button_device_ids[] = { + {"PNP0C0C", 0}, /* Power button */ + {"PNP0C0D", ACPI_AVOID_WAKE_FROM_S5}, /* Lid */ + {"PNP0C0E", ACPI_AVOID_WAKE_FROM_S5}, /* Sleep button */ {"", 0}, }; + struct acpi_device_wakeup *wakeup = &device->wakeup; + const struct acpi_device_id *match; acpi_status status; - acpi_event_status event_status; - device->wakeup.flags.notifier_present = 0; + wakeup->flags.notifier_present = 0; /* Power button, Lid switch always enable wakeup */ - if (!acpi_match_device_ids(device, button_device_ids)) { - device->wakeup.flags.run_wake = 1; - if (!acpi_match_device_ids(device, &button_device_ids[1])) { - /* Do not use Lid/sleep button for S5 wakeup */ - if (device->wakeup.sleep_state == ACPI_STATE_S5) - device->wakeup.sleep_state = ACPI_STATE_S4; - } + match = acpi_match_acpi_device(button_device_ids, device); + if (match) { + if ((match->driver_data & ACPI_AVOID_WAKE_FROM_S5) && + wakeup->sleep_state == ACPI_STATE_S5) + wakeup->sleep_state = ACPI_STATE_S4; + acpi_mark_gpe_for_wake(wakeup->gpe_device, wakeup->gpe_number); device_set_wakeup_capable(&device->dev, true); - return; + return true; } - status = acpi_get_gpe_status(device->wakeup.gpe_device, - device->wakeup.gpe_number, - &event_status); - if (status == AE_OK) - device->wakeup.flags.run_wake = - !!(event_status & ACPI_EVENT_FLAG_HANDLE); + status = acpi_setup_gpe_for_wake(device->handle, wakeup->gpe_device, + wakeup->gpe_number); + return ACPI_SUCCESS(status); } static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device) { - acpi_handle temp; - acpi_status status = 0; int err; /* Presence of _PRW indicates wake capable */ - status = acpi_get_handle(device->handle, "_PRW", &temp); - if (ACPI_FAILURE(status)) + if (!acpi_has_method(device->handle, "_PRW")) return; - err = acpi_bus_extract_wakeup_device_power_package(device->handle, - &device->wakeup); + err = acpi_bus_extract_wakeup_device_power_package(device); if (err) { - dev_err(&device->dev, "_PRW evaluation error: %d\n", err); + dev_err(&device->dev, "Unable to extract wakeup power resources"); return; } - device->wakeup.flags.valid = 1; + device->wakeup.flags.valid = acpi_wakeup_gpe_init(device); device->wakeup.prepare_count = 0; - acpi_bus_set_run_wake_flags(device); - /* Call _PSW/_DSW object to disable its ability to wake the sleeping + /* + * Call _PSW/_DSW object to disable its ability to wake the sleeping * system for the ACPI device with the _PRW object. - * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW. + * The _PSW object is deprecated in ACPI 3.0 and is replaced by _DSW. * So it is necessary to call _DSW object first. Only when it is not * present will the _PSW object used. */ err = acpi_device_sleep_wake(device, 0, 0, 0); if (err) - ACPI_DEBUG_PRINT((ACPI_DB_INFO, - "error in _DSW or _PSW evaluation\n")); + pr_debug("error in _DSW or _PSW evaluation\n"); } static void acpi_bus_init_power_state(struct acpi_device *device, int state) @@ -1370,7 +1064,6 @@ static void acpi_bus_init_power_state(struct acpi_device *device, int state) struct acpi_device_power_state *ps = &device->power.states[state]; char pathname[5] = { '_', 'P', 'R', '0' + state, '\0' }; struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; - acpi_handle handle; acpi_status status; INIT_LIST_HEAD(&ps->resources); @@ -1382,30 +1075,20 @@ static void acpi_bus_init_power_state(struct acpi_device *device, int state) if (buffer.length && package && package->type == ACPI_TYPE_PACKAGE - && package->package.count) { - int err = acpi_extract_power_resources(package, 0, - &ps->resources); - if (!err) - device->power.flags.power_resources = 1; - } + && package->package.count) + acpi_extract_power_resources(package, 0, &ps->resources); + ACPI_FREE(buffer.pointer); } /* Evaluate "_PSx" to see if we can do explicit sets */ pathname[2] = 'S'; - status = acpi_get_handle(device->handle, pathname, &handle); - if (ACPI_SUCCESS(status)) + if (acpi_has_method(device->handle, pathname)) ps->flags.explicit_set = 1; - /* - * State is valid if there are means to put the device into it. - * D3hot is only valid if _PR3 present. - */ - if (!list_empty(&ps->resources) - || (ps->flags.explicit_set && state < ACPI_STATE_D3_HOT)) { + /* State is valid if there are means to put the device into it. */ + if (!list_empty(&ps->resources) || ps->flags.explicit_set) ps->flags.valid = 1; - ps->flags.os_accessible = 1; - } ps->power = -1; /* Unknown - driver assigned */ ps->latency = -1; /* Unknown - driver assigned */ @@ -1413,30 +1096,31 @@ static void acpi_bus_init_power_state(struct acpi_device *device, int state) static void acpi_bus_get_power_flags(struct acpi_device *device) { - acpi_status status; - acpi_handle handle; + unsigned long long dsc = ACPI_STATE_D0; u32 i; /* Presence of _PS0|_PR0 indicates 'power manageable' */ - status = acpi_get_handle(device->handle, "_PS0", &handle); - if (ACPI_FAILURE(status)) { - status = acpi_get_handle(device->handle, "_PR0", &handle); - if (ACPI_FAILURE(status)) - return; - } + if (!acpi_has_method(device->handle, "_PS0") && + !acpi_has_method(device->handle, "_PR0")) + return; device->flags.power_manageable = 1; /* * Power Management Flags */ - status = acpi_get_handle(device->handle, "_PSC", &handle); - if (ACPI_SUCCESS(status)) + if (acpi_has_method(device->handle, "_PSC")) device->power.flags.explicit_get = 1; - status = acpi_get_handle(device->handle, "_IRC", &handle); - if (ACPI_SUCCESS(status)) + + if (acpi_has_method(device->handle, "_IRC")) device->power.flags.inrush_current = 1; + if (acpi_has_method(device->handle, "_DSW")) + device->power.flags.dsw_present = 1; + + acpi_evaluate_integer(device->handle, "_DSC", NULL, &dsc); + device->power.state_for_enumeration = dsc; + /* * Enumerate supported power management states */ @@ -1445,51 +1129,44 @@ static void acpi_bus_get_power_flags(struct acpi_device *device) INIT_LIST_HEAD(&device->power.states[ACPI_STATE_D3_COLD].resources); - /* Set defaults for D0 and D3 states (always valid) */ + /* Set the defaults for D0 and D3hot (always supported). */ device->power.states[ACPI_STATE_D0].flags.valid = 1; device->power.states[ACPI_STATE_D0].power = 100; - device->power.states[ACPI_STATE_D3].flags.valid = 1; - device->power.states[ACPI_STATE_D3].power = 0; - - /* Set D3cold's explicit_set flag if _PS3 exists. */ - if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set) - device->power.states[ACPI_STATE_D3_COLD].flags.explicit_set = 1; + device->power.states[ACPI_STATE_D3_HOT].flags.valid = 1; - /* Presence of _PS3 or _PRx means we can put the device into D3 cold */ - if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set || - device->power.flags.power_resources) - device->power.states[ACPI_STATE_D3_COLD].flags.os_accessible = 1; + /* + * Use power resources only if the D0 list of them is populated, because + * some platforms may provide _PR3 only to indicate D3cold support and + * in those cases the power resources list returned by it may be bogus. + */ + if (!list_empty(&device->power.states[ACPI_STATE_D0].resources)) { + device->power.flags.power_resources = 1; + /* + * D3cold is supported if the D3hot list of power resources is + * not empty. + */ + if (!list_empty(&device->power.states[ACPI_STATE_D3_HOT].resources)) + device->power.states[ACPI_STATE_D3_COLD].flags.valid = 1; + } - if (acpi_bus_init_power(device)) { - acpi_free_power_resources_lists(device); + if (acpi_bus_init_power(device)) device->flags.power_manageable = 0; - } } static void acpi_bus_get_flags(struct acpi_device *device) { - acpi_status status = AE_OK; - acpi_handle temp = NULL; - /* Presence of _STA indicates 'dynamic_status' */ - status = acpi_get_handle(device->handle, "_STA", &temp); - if (ACPI_SUCCESS(status)) + if (acpi_has_method(device->handle, "_STA")) device->flags.dynamic_status = 1; /* Presence of _RMV indicates 'removable' */ - status = acpi_get_handle(device->handle, "_RMV", &temp); - if (ACPI_SUCCESS(status)) + if (acpi_has_method(device->handle, "_RMV")) device->flags.removable = 1; /* Presence of _EJD|_EJ0 indicates 'ejectable' */ - status = acpi_get_handle(device->handle, "_EJD", &temp); - if (ACPI_SUCCESS(status)) + if (acpi_has_method(device->handle, "_EJD") || + acpi_has_method(device->handle, "_EJ0")) device->flags.ejectable = 1; - else { - status = acpi_get_handle(device->handle, "_EJ0", &temp); - if (ACPI_SUCCESS(status)) - device->flags.ejectable = 1; - } } static void acpi_device_get_busid(struct acpi_device *device) @@ -1504,17 +1181,20 @@ static void acpi_device_get_busid(struct acpi_device *device) * The device's Bus ID is simply the object name. * TBD: Shouldn't this value be unique (within the ACPI namespace)? */ - if (ACPI_IS_ROOT_DEVICE(device)) { - strcpy(device->pnp.bus_id, "ACPI"); + if (!acpi_dev_parent(device)) { + strscpy(device->pnp.bus_id, "ACPI"); return; } switch (device->device_type) { case ACPI_BUS_TYPE_POWER_BUTTON: - strcpy(device->pnp.bus_id, "PWRF"); + strscpy(device->pnp.bus_id, "PWRF"); break; case ACPI_BUS_TYPE_SLEEP_BUTTON: - strcpy(device->pnp.bus_id, "SLPF"); + strscpy(device->pnp.bus_id, "SLPF"); + break; + case ACPI_BUS_TYPE_ECDT_EC: + strscpy(device->pnp.bus_id, "ECDT"); break; default: acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer); @@ -1525,62 +1205,134 @@ static void acpi_device_get_busid(struct acpi_device *device) else break; } - strcpy(device->pnp.bus_id, bus_id); + strscpy(device->pnp.bus_id, bus_id); break; } } /* + * acpi_ata_match - see if an acpi object is an ATA device + * + * If an acpi object has one of the ACPI ATA methods defined, + * then we can safely call it an ATA device. + */ +bool acpi_ata_match(acpi_handle handle) +{ + return acpi_has_method(handle, "_GTF") || + acpi_has_method(handle, "_GTM") || + acpi_has_method(handle, "_STM") || + acpi_has_method(handle, "_SDD"); +} + +/* * acpi_bay_match - see if an acpi object is an ejectable driver bay * * If an acpi object is ejectable and has one of the ACPI ATA methods defined, * then we can safely call it an ejectable drive bay */ -static int acpi_bay_match(acpi_handle handle) +bool acpi_bay_match(acpi_handle handle) { - acpi_status status; - acpi_handle tmp; acpi_handle phandle; - status = acpi_get_handle(handle, "_EJ0", &tmp); - if (ACPI_FAILURE(status)) - return -ENODEV; + if (!acpi_has_method(handle, "_EJ0")) + return false; + if (acpi_ata_match(handle)) + return true; + if (ACPI_FAILURE(acpi_get_parent(handle, &phandle))) + return false; - if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) || - (ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) || - (ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) || - (ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp)))) - return 0; + return acpi_ata_match(phandle); +} - if (acpi_get_parent(handle, &phandle)) - return -ENODEV; +bool acpi_device_is_battery(struct acpi_device *adev) +{ + struct acpi_hardware_id *hwid; - if ((ACPI_SUCCESS(acpi_get_handle(phandle, "_GTF", &tmp))) || - (ACPI_SUCCESS(acpi_get_handle(phandle, "_GTM", &tmp))) || - (ACPI_SUCCESS(acpi_get_handle(phandle, "_STM", &tmp))) || - (ACPI_SUCCESS(acpi_get_handle(phandle, "_SDD", &tmp)))) - return 0; + list_for_each_entry(hwid, &adev->pnp.ids, list) + if (!strcmp("PNP0C0A", hwid->id)) + return true; - return -ENODEV; + return false; +} + +static bool is_ejectable_bay(struct acpi_device *adev) +{ + acpi_handle handle = adev->handle; + + if (acpi_has_method(handle, "_EJ0") && acpi_device_is_battery(adev)) + return true; + + return acpi_bay_match(handle); } /* * acpi_dock_match - see if an acpi object has a _DCK method */ -static int acpi_dock_match(acpi_handle handle) +bool acpi_dock_match(acpi_handle handle) { - acpi_handle tmp; - return acpi_get_handle(handle, "_DCK", &tmp); + return acpi_has_method(handle, "_DCK"); } +static acpi_status +acpi_backlight_cap_match(acpi_handle handle, u32 level, void *context, + void **return_value) +{ + long *cap = context; + + if (acpi_has_method(handle, "_BCM") && + acpi_has_method(handle, "_BCL")) { + acpi_handle_debug(handle, "Found generic backlight support\n"); + *cap |= ACPI_VIDEO_BACKLIGHT; + /* We have backlight support, no need to scan further */ + return AE_CTRL_TERMINATE; + } + return 0; +} + +/* Returns true if the ACPI object is a video device which can be + * handled by video.ko. + * The device will get a Linux specific CID added in scan.c to + * identify the device as an ACPI graphics device + * Be aware that the graphics device may not be physically present + * Use acpi_video_get_capabilities() to detect general ACPI video + * capabilities of present cards + */ +long acpi_is_video_device(acpi_handle handle) +{ + long video_caps = 0; + + /* Is this device able to support video switching ? */ + if (acpi_has_method(handle, "_DOD") || acpi_has_method(handle, "_DOS")) + video_caps |= ACPI_VIDEO_OUTPUT_SWITCHING; + + /* Is this device able to retrieve a video ROM ? */ + if (acpi_has_method(handle, "_ROM")) + video_caps |= ACPI_VIDEO_ROM_AVAILABLE; + + /* Is this device able to configure which video head to be POSTed ? */ + if (acpi_has_method(handle, "_VPO") && + acpi_has_method(handle, "_GPD") && + acpi_has_method(handle, "_SPD")) + video_caps |= ACPI_VIDEO_DEVICE_POSTING; + + /* Only check for backlight functionality if one of the above hit. */ + if (video_caps) + acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, + ACPI_UINT32_MAX, acpi_backlight_cap_match, NULL, + &video_caps, NULL); + + return video_caps; +} +EXPORT_SYMBOL(acpi_is_video_device); + const char *acpi_device_hid(struct acpi_device *device) { struct acpi_hardware_id *hid; - if (list_empty(&device->pnp.ids)) + hid = list_first_entry_or_null(&device->pnp.ids, struct acpi_hardware_id, list); + if (!hid) return dummy_hid; - hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list); return hid->id; } EXPORT_SYMBOL(acpi_device_hid); @@ -1593,7 +1345,7 @@ static void acpi_add_id(struct acpi_device_pnp *pnp, const char *dev_id) if (!id) return; - id->id = kstrdup(dev_id, GFP_KERNEL); + id->id = kstrdup_const(dev_id, GFP_KERNEL); if (!id->id) { kfree(id); return; @@ -1608,41 +1360,46 @@ static void acpi_add_id(struct acpi_device_pnp *pnp, const char *dev_id) * lacks the SMBUS01 HID and the methods do not have the necessary "_" * prefix. Work around this. */ -static int acpi_ibm_smbus_match(acpi_handle handle) +static bool acpi_ibm_smbus_match(acpi_handle handle) { - acpi_handle h_dummy; - struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL}; - int result; + char node_name[ACPI_PATH_SEGMENT_LENGTH]; + struct acpi_buffer path = { sizeof(node_name), node_name }; if (!dmi_name_in_vendors("IBM")) - return -ENODEV; + return false; /* Look for SMBS object */ - result = acpi_get_name(handle, ACPI_SINGLE_NAME, &path); - if (result) - return result; - - if (strcmp("SMBS", path.pointer)) { - result = -ENODEV; - goto out; - } + if (ACPI_FAILURE(acpi_get_name(handle, ACPI_SINGLE_NAME, &path)) || + strcmp("SMBS", path.pointer)) + return false; /* Does it have the necessary (but misnamed) methods? */ - result = -ENODEV; - if (ACPI_SUCCESS(acpi_get_handle(handle, "SBI", &h_dummy)) && - ACPI_SUCCESS(acpi_get_handle(handle, "SBR", &h_dummy)) && - ACPI_SUCCESS(acpi_get_handle(handle, "SBW", &h_dummy))) - result = 0; -out: - kfree(path.pointer); - return result; + if (acpi_has_method(handle, "SBI") && + acpi_has_method(handle, "SBR") && + acpi_has_method(handle, "SBW")) + return true; + + return false; +} + +static bool acpi_object_is_system_bus(acpi_handle handle) +{ + acpi_handle tmp; + + if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_SB", &tmp)) && + tmp == handle) + return true; + if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_TZ", &tmp)) && + tmp == handle) + return true; + + return false; } static void acpi_set_pnp_ids(acpi_handle handle, struct acpi_device_pnp *pnp, - int device_type) + int device_type) { - acpi_status status; - struct acpi_device_info *info; + struct acpi_device_info *info = NULL; struct acpi_pnp_device_id_list *cid_list; int i; @@ -1653,15 +1410,16 @@ static void acpi_set_pnp_ids(acpi_handle handle, struct acpi_device_pnp *pnp, break; } - status = acpi_get_object_info(handle, &info); - if (ACPI_FAILURE(status)) { - pr_err(PREFIX "%s: Error reading device info\n", - __func__); + acpi_get_object_info(handle, &info); + if (!info) { + pr_err("%s: Error reading device info\n", __func__); return; } - if (info->valid & ACPI_VALID_HID) + if (info->valid & ACPI_VALID_HID) { acpi_add_id(pnp, info->hardware_id.string); + pnp->type.platform_id = 1; + } if (info->valid & ACPI_VALID_CID) { cid_list = &info->compatible_id_list; for (i = 0; i < cid_list->count; i++) @@ -1674,6 +1432,8 @@ static void acpi_set_pnp_ids(acpi_handle handle, struct acpi_device_pnp *pnp, if (info->valid & ACPI_VALID_UID) pnp->unique_id = kstrdup(info->unique_id.string, GFP_KERNEL); + if (info->valid & ACPI_VALID_CLS) + acpi_add_id(pnp, info->class_code.string); kfree(info); @@ -1681,18 +1441,23 @@ static void acpi_set_pnp_ids(acpi_handle handle, struct acpi_device_pnp *pnp, * Some devices don't reliably have _HIDs & _CIDs, so add * synthetic HIDs to make sure drivers can find them. */ - if (acpi_is_video_device(handle)) + if (acpi_is_video_device(handle)) { acpi_add_id(pnp, ACPI_VIDEO_HID); - else if (ACPI_SUCCESS(acpi_bay_match(handle))) + pnp->type.backlight = 1; + break; + } + if (acpi_bay_match(handle)) acpi_add_id(pnp, ACPI_BAY_HID); - else if (ACPI_SUCCESS(acpi_dock_match(handle))) + else if (acpi_dock_match(handle)) acpi_add_id(pnp, ACPI_DOCK_HID); - else if (!acpi_ibm_smbus_match(handle)) + else if (acpi_ibm_smbus_match(handle)) acpi_add_id(pnp, ACPI_SMBUS_IBM_HID); - else if (list_empty(&pnp->ids) && handle == ACPI_ROOT_OBJECT) { - acpi_add_id(pnp, ACPI_BUS_HID); /* \_SB, LNXSYBUS */ - strcpy(pnp->device_name, ACPI_BUS_DEVICE_NAME); - strcpy(pnp->device_class, ACPI_BUS_CLASS); + else if (list_empty(&pnp->ids) && + acpi_object_is_system_bus(handle)) { + /* \_SB, \_TZ, LNXSYBUS */ + acpi_add_id(pnp, ACPI_BUS_HID); + strscpy(pnp->device_name, ACPI_BUS_DEVICE_NAME); + strscpy(pnp->device_class, ACPI_BUS_CLASS); } break; @@ -1711,6 +1476,9 @@ static void acpi_set_pnp_ids(acpi_handle handle, struct acpi_device_pnp *pnp, case ACPI_BUS_TYPE_SLEEP_BUTTON: acpi_add_id(pnp, ACPI_BUTTON_HID_SLEEPF); break; + case ACPI_BUS_TYPE_ECDT_EC: + acpi_add_id(pnp, ACPI_ECDT_HID); + break; } } @@ -1719,54 +1487,428 @@ void acpi_free_pnp_ids(struct acpi_device_pnp *pnp) struct acpi_hardware_id *id, *tmp; list_for_each_entry_safe(id, tmp, &pnp->ids, list) { - kfree(id->id); + kfree_const(id->id); kfree(id); } kfree(pnp->unique_id); } +/** + * acpi_dma_supported - Check DMA support for the specified device. + * @adev: The pointer to acpi device + * + * Return false if DMA is not supported. Otherwise, return true + */ +bool acpi_dma_supported(const struct acpi_device *adev) +{ + if (!adev) + return false; + + if (adev->flags.cca_seen) + return true; + + /* + * Per ACPI 6.0 sec 6.2.17, assume devices can do cache-coherent + * DMA on "Intel platforms". Presumably that includes all x86 and + * ia64, and other arches will set CONFIG_ACPI_CCA_REQUIRED=y. + */ + if (!IS_ENABLED(CONFIG_ACPI_CCA_REQUIRED)) + return true; + + return false; +} + +/** + * acpi_get_dma_attr - Check the supported DMA attr for the specified device. + * @adev: The pointer to acpi device + * + * Return enum dev_dma_attr. + */ +enum dev_dma_attr acpi_get_dma_attr(struct acpi_device *adev) +{ + if (!acpi_dma_supported(adev)) + return DEV_DMA_NOT_SUPPORTED; + + if (adev->flags.coherent_dma) + return DEV_DMA_COHERENT; + else + return DEV_DMA_NON_COHERENT; +} + +/** + * acpi_dma_get_range() - Get device DMA parameters. + * + * @dev: device to configure + * @map: pointer to DMA ranges result + * + * Evaluate DMA regions and return pointer to DMA regions on + * parsing success; it does not update the passed in values on failure. + * + * Return 0 on success, < 0 on failure. + */ +int acpi_dma_get_range(struct device *dev, const struct bus_dma_region **map) +{ + struct acpi_device *adev; + LIST_HEAD(list); + struct resource_entry *rentry; + int ret; + struct device *dma_dev = dev; + struct bus_dma_region *r; + + /* + * Walk the device tree chasing an ACPI companion with a _DMA + * object while we go. Stop if we find a device with an ACPI + * companion containing a _DMA method. + */ + do { + adev = ACPI_COMPANION(dma_dev); + if (adev && acpi_has_method(adev->handle, METHOD_NAME__DMA)) + break; + + dma_dev = dma_dev->parent; + } while (dma_dev); + + if (!dma_dev) + return -ENODEV; + + if (!acpi_has_method(adev->handle, METHOD_NAME__CRS)) { + acpi_handle_warn(adev->handle, "_DMA is valid only if _CRS is present\n"); + return -EINVAL; + } + + ret = acpi_dev_get_dma_resources(adev, &list); + if (ret > 0) { + r = kcalloc(ret + 1, sizeof(*r), GFP_KERNEL); + if (!r) { + ret = -ENOMEM; + goto out; + } + + *map = r; + + list_for_each_entry(rentry, &list, node) { + if (rentry->res->start >= rentry->res->end) { + kfree(*map); + *map = NULL; + ret = -EINVAL; + dev_dbg(dma_dev, "Invalid DMA regions configuration\n"); + goto out; + } + + r->cpu_start = rentry->res->start; + r->dma_start = rentry->res->start - rentry->offset; + r->size = resource_size(rentry->res); + r++; + } + } + out: + acpi_dev_free_resource_list(&list); + + return ret >= 0 ? 0 : ret; +} + +#ifdef CONFIG_IOMMU_API +int acpi_iommu_fwspec_init(struct device *dev, u32 id, + struct fwnode_handle *fwnode) +{ + int ret; + + ret = iommu_fwspec_init(dev, fwnode); + if (ret) + return ret; + + return iommu_fwspec_add_ids(dev, &id, 1); +} + +static int acpi_iommu_configure_id(struct device *dev, const u32 *id_in) +{ + int err; + + /* Serialise to make dev->iommu stable under our potential fwspec */ + mutex_lock(&iommu_probe_device_lock); + /* If we already translated the fwspec there is nothing left to do */ + if (dev_iommu_fwspec_get(dev)) { + mutex_unlock(&iommu_probe_device_lock); + return 0; + } + + err = iort_iommu_configure_id(dev, id_in); + if (err && err != -EPROBE_DEFER) + err = rimt_iommu_configure_id(dev, id_in); + if (err && err != -EPROBE_DEFER) + err = viot_iommu_configure(dev); + + mutex_unlock(&iommu_probe_device_lock); + + return err; +} + +#else /* !CONFIG_IOMMU_API */ + +int acpi_iommu_fwspec_init(struct device *dev, u32 id, + struct fwnode_handle *fwnode) +{ + return -ENODEV; +} + +static int acpi_iommu_configure_id(struct device *dev, const u32 *id_in) +{ + return -ENODEV; +} + +#endif /* !CONFIG_IOMMU_API */ + +/** + * acpi_dma_configure_id - Set-up DMA configuration for the device. + * @dev: The pointer to the device + * @attr: device dma attributes + * @input_id: input device id const value pointer + */ +int acpi_dma_configure_id(struct device *dev, enum dev_dma_attr attr, + const u32 *input_id) +{ + int ret; + + if (attr == DEV_DMA_NOT_SUPPORTED) { + set_dma_ops(dev, &dma_dummy_ops); + return 0; + } + + acpi_arch_dma_setup(dev); + + /* Ignore all other errors apart from EPROBE_DEFER */ + ret = acpi_iommu_configure_id(dev, input_id); + if (ret == -EPROBE_DEFER) + return -EPROBE_DEFER; + if (ret) + dev_dbg(dev, "Adding to IOMMU failed: %d\n", ret); + + arch_setup_dma_ops(dev, attr == DEV_DMA_COHERENT); + + return 0; +} +EXPORT_SYMBOL_GPL(acpi_dma_configure_id); + +static void acpi_init_coherency(struct acpi_device *adev) +{ + unsigned long long cca = 0; + acpi_status status; + struct acpi_device *parent = acpi_dev_parent(adev); + + if (parent && parent->flags.cca_seen) { + /* + * From ACPI spec, OSPM will ignore _CCA if an ancestor + * already saw one. + */ + adev->flags.cca_seen = 1; + cca = parent->flags.coherent_dma; + } else { + status = acpi_evaluate_integer(adev->handle, "_CCA", + NULL, &cca); + if (ACPI_SUCCESS(status)) + adev->flags.cca_seen = 1; + else if (!IS_ENABLED(CONFIG_ACPI_CCA_REQUIRED)) + /* + * If architecture does not specify that _CCA is + * required for DMA-able devices (e.g. x86), + * we default to _CCA=1. + */ + cca = 1; + else + acpi_handle_debug(adev->handle, + "ACPI device is missing _CCA.\n"); + } + + adev->flags.coherent_dma = cca; +} + +static int acpi_check_serial_bus_slave(struct acpi_resource *ares, void *data) +{ + bool *is_serial_bus_slave_p = data; + + if (ares->type != ACPI_RESOURCE_TYPE_SERIAL_BUS) + return 1; + + *is_serial_bus_slave_p = true; + + /* no need to do more checking */ + return -1; +} + +static bool acpi_is_indirect_io_slave(struct acpi_device *device) +{ + struct acpi_device *parent = acpi_dev_parent(device); + static const struct acpi_device_id indirect_io_hosts[] = { + {"HISI0191", 0}, + {} + }; + + return parent && !acpi_match_device_ids(parent, indirect_io_hosts); +} + +static bool acpi_device_enumeration_by_parent(struct acpi_device *device) +{ + struct list_head resource_list; + bool is_serial_bus_slave = false; + static const struct acpi_device_id ignore_serial_bus_ids[] = { + /* + * These devices have multiple SerialBus resources and a client + * device must be instantiated for each of them, each with + * its own device id. + * Normally we only instantiate one client device for the first + * resource, using the ACPI HID as id. These special cases are handled + * by the drivers/platform/x86/serial-multi-instantiate.c driver, which + * knows which client device id to use for each resource. + */ + {"BSG1160", }, + {"BSG2150", }, + {"CSC3551", }, + {"CSC3554", }, + {"CSC3556", }, + {"CSC3557", }, + {"INT33FE", }, + {"INT3515", }, + {"TXNW2781", }, + /* Non-conforming _HID for Cirrus Logic already released */ + {"CLSA0100", }, + {"CLSA0101", }, + /* + * Some ACPI devs contain SerialBus resources even though they are not + * attached to a serial bus at all. + */ + {ACPI_VIDEO_HID, }, + {"MSHW0028", }, + /* + * HIDs of device with an UartSerialBusV2 resource for which userspace + * expects a regular tty cdev to be created (instead of the in kernel + * serdev) and which have a kernel driver which expects a platform_dev + * such as the rfkill-gpio driver. + */ + {"BCM4752", }, + {"LNV4752", }, + {} + }; + + if (acpi_is_indirect_io_slave(device)) + return true; + + /* Macs use device properties in lieu of _CRS resources */ + if (x86_apple_machine && + (fwnode_property_present(&device->fwnode, "spiSclkPeriod") || + fwnode_property_present(&device->fwnode, "i2cAddress") || + fwnode_property_present(&device->fwnode, "baud"))) + return true; + + if (!acpi_match_device_ids(device, ignore_serial_bus_ids)) + return false; + + INIT_LIST_HEAD(&resource_list); + acpi_dev_get_resources(device, &resource_list, + acpi_check_serial_bus_slave, + &is_serial_bus_slave); + acpi_dev_free_resource_list(&resource_list); + + return is_serial_bus_slave; +} + void acpi_init_device_object(struct acpi_device *device, acpi_handle handle, - int type, unsigned long long sta) + int type, void (*release)(struct device *)) { + struct acpi_device *parent = acpi_find_parent_acpi_dev(handle); + INIT_LIST_HEAD(&device->pnp.ids); device->device_type = type; device->handle = handle; - device->parent = acpi_bus_get_parent(handle); - STRUCT_TO_INT(device->status) = sta; + device->dev.parent = parent ? &parent->dev : NULL; + device->dev.release = release; + device->dev.bus = &acpi_bus_type; + device->dev.groups = acpi_groups; + fwnode_init(&device->fwnode, &acpi_device_fwnode_ops); + acpi_set_device_status(device, ACPI_STA_DEFAULT); acpi_device_get_busid(device); acpi_set_pnp_ids(handle, &device->pnp, type); + acpi_init_properties(device); acpi_bus_get_flags(device); device->flags.match_driver = false; + device->flags.initialized = true; + device->flags.enumeration_by_parent = + acpi_device_enumeration_by_parent(device); + acpi_device_clear_enumerated(device); device_initialize(&device->dev); dev_set_uevent_suppress(&device->dev, true); + acpi_init_coherency(device); +} + +static void acpi_scan_dep_init(struct acpi_device *adev) +{ + struct acpi_dep_data *dep; + + list_for_each_entry(dep, &acpi_dep_list, node) { + if (dep->consumer == adev->handle) { + if (dep->honor_dep) + adev->flags.honor_deps = 1; + + if (!dep->met) + adev->dep_unmet++; + } + } } void acpi_device_add_finalize(struct acpi_device *device) { - device->flags.match_driver = true; dev_set_uevent_suppress(&device->dev, false); kobject_uevent(&device->dev.kobj, KOBJ_ADD); } +static void acpi_scan_init_status(struct acpi_device *adev) +{ + if (acpi_bus_get_status(adev)) + acpi_set_device_status(adev, 0); +} + static int acpi_add_single_object(struct acpi_device **child, - acpi_handle handle, int type, - unsigned long long sta) + acpi_handle handle, int type, bool dep_init) { - int result; struct acpi_device *device; - struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; + bool release_dep_lock = false; + int result; device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL); - if (!device) { - printk(KERN_ERR PREFIX "Memory allocation error\n"); + if (!device) return -ENOMEM; + + acpi_init_device_object(device, handle, type, acpi_device_release); + /* + * Getting the status is delayed till here so that we can call + * acpi_bus_get_status() and use its quirk handling. Note that + * this must be done before the get power-/wakeup_dev-flags calls. + */ + if (type == ACPI_BUS_TYPE_DEVICE || type == ACPI_BUS_TYPE_PROCESSOR) { + if (dep_init) { + mutex_lock(&acpi_dep_list_lock); + /* + * Hold the lock until the acpi_tie_acpi_dev() call + * below to prevent concurrent acpi_scan_clear_dep() + * from deleting a dependency list entry without + * updating dep_unmet for the device. + */ + release_dep_lock = true; + acpi_scan_dep_init(device); + } + acpi_scan_init_status(device); } - acpi_init_device_object(device, handle, type, sta); acpi_bus_get_power_flags(device); acpi_bus_get_wakeup_device_flags(device); - result = acpi_device_add(device, acpi_device_release); + result = acpi_tie_acpi_dev(device); + + if (release_dep_lock) + mutex_unlock(&acpi_dep_list_lock); + + if (!result) + result = acpi_device_add(device); + if (result) { acpi_device_release(&device->dev); return result; @@ -1774,60 +1916,69 @@ static int acpi_add_single_object(struct acpi_device **child, acpi_power_add_remove_device(device, true); acpi_device_add_finalize(device); - acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer); - ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Added %s [%s] parent %s\n", - dev_name(&device->dev), (char *) buffer.pointer, - device->parent ? dev_name(&device->parent->dev) : "(null)")); - kfree(buffer.pointer); + + acpi_handle_debug(handle, "Added as %s, parent %s\n", + dev_name(&device->dev), device->dev.parent ? + dev_name(device->dev.parent) : "(null)"); + *child = device; return 0; } -static int acpi_bus_type_and_status(acpi_handle handle, int *type, - unsigned long long *sta) +static acpi_status acpi_get_resource_memory(struct acpi_resource *ares, + void *context) +{ + struct resource *res = context; + + if (acpi_dev_resource_memory(ares, res)) + return AE_CTRL_TERMINATE; + + return AE_OK; +} + +static bool acpi_device_should_be_hidden(acpi_handle handle) { acpi_status status; - acpi_object_type acpi_type; + struct resource res; - status = acpi_get_type(handle, &acpi_type); - if (ACPI_FAILURE(status)) - return -ENODEV; + /* Check if it should ignore the UART device */ + if (!(spcr_uart_addr && acpi_has_method(handle, METHOD_NAME__CRS))) + return false; - switch (acpi_type) { - case ACPI_TYPE_ANY: /* for ACPI_ROOT_OBJECT */ - case ACPI_TYPE_DEVICE: - *type = ACPI_BUS_TYPE_DEVICE; - status = acpi_bus_get_status_handle(handle, sta); - if (ACPI_FAILURE(status)) - return -ENODEV; - break; - case ACPI_TYPE_PROCESSOR: - *type = ACPI_BUS_TYPE_PROCESSOR; - status = acpi_bus_get_status_handle(handle, sta); - if (ACPI_FAILURE(status)) - return -ENODEV; - break; - case ACPI_TYPE_THERMAL: - *type = ACPI_BUS_TYPE_THERMAL; - *sta = ACPI_STA_DEFAULT; - break; - case ACPI_TYPE_POWER: - *type = ACPI_BUS_TYPE_POWER; - *sta = ACPI_STA_DEFAULT; - break; - default: - return -ENODEV; - } + /* + * The UART device described in SPCR table is assumed to have only one + * memory resource present. So we only look for the first one here. + */ + status = acpi_walk_resources(handle, METHOD_NAME__CRS, + acpi_get_resource_memory, &res); + if (ACPI_FAILURE(status) || res.start != spcr_uart_addr) + return false; - return 0; + acpi_handle_info(handle, "The UART device @%pa in SPCR table will be hidden\n", + &res.start); + + return true; +} + +bool acpi_device_is_present(const struct acpi_device *adev) +{ + return adev->status.present || adev->status.functional; +} + +bool acpi_device_is_enabled(const struct acpi_device *adev) +{ + return adev->status.enabled; } static bool acpi_scan_handler_matching(struct acpi_scan_handler *handler, - char *idstr, + const char *idstr, const struct acpi_device_id **matchid) { const struct acpi_device_id *devid; + if (handler->match) + return handler->match(idstr, matchid); + for (devid = handler->ids; devid->id[0]; devid++) if (!strcmp((char *)devid->id, idstr)) { if (matchid) @@ -1839,7 +1990,7 @@ static bool acpi_scan_handler_matching(struct acpi_scan_handler *handler, return false; } -static struct acpi_scan_handler *acpi_scan_match_handler(char *idstr, +static struct acpi_scan_handler *acpi_scan_match_handler(const char *idstr, const struct acpi_device_id **matchid) { struct acpi_scan_handler *handler; @@ -1863,84 +2014,233 @@ void acpi_scan_hotplug_enabled(struct acpi_hotplug_profile *hotplug, bool val) mutex_unlock(&acpi_scan_lock); } -static void acpi_scan_init_hotplug(acpi_handle handle, int type) +int acpi_scan_add_dep(acpi_handle handle, struct acpi_handle_list *dep_devices) { - struct acpi_device_pnp pnp = {}; - struct acpi_hardware_id *hwid; - struct acpi_scan_handler *handler; + u32 count; + int i; - INIT_LIST_HEAD(&pnp.ids); - acpi_set_pnp_ids(handle, &pnp, type); + for (count = 0, i = 0; i < dep_devices->count; i++) { + struct acpi_device_info *info; + struct acpi_dep_data *dep; + bool skip, honor_dep; + acpi_status status; - if (!pnp.type.hardware_id) - goto out; + status = acpi_get_object_info(dep_devices->handles[i], &info); + if (ACPI_FAILURE(status)) { + acpi_handle_debug(handle, "Error reading _DEP device info\n"); + continue; + } + + skip = acpi_info_matches_ids(info, acpi_ignore_dep_ids); + honor_dep = acpi_info_matches_ids(info, acpi_honor_dep_ids); + kfree(info); + + if (skip) + continue; + + dep = kzalloc(sizeof(*dep), GFP_KERNEL); + if (!dep) + continue; + + count++; + + dep->supplier = dep_devices->handles[i]; + dep->consumer = handle; + dep->honor_dep = honor_dep; + + mutex_lock(&acpi_dep_list_lock); + list_add_tail(&dep->node, &acpi_dep_list); + mutex_unlock(&acpi_dep_list_lock); + } + + acpi_handle_list_free(dep_devices); + return count; +} + +static void acpi_scan_init_hotplug(struct acpi_device *adev) +{ + struct acpi_hardware_id *hwid; + + if (acpi_dock_match(adev->handle) || is_ejectable_bay(adev)) { + acpi_dock_add(adev); + return; + } + list_for_each_entry(hwid, &adev->pnp.ids, list) { + struct acpi_scan_handler *handler; - /* - * This relies on the fact that acpi_install_notify_handler() will not - * install the same notify handler routine twice for the same handle. - */ - list_for_each_entry(hwid, &pnp.ids, list) { handler = acpi_scan_match_handler(hwid->id, NULL); if (handler) { - acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY, - acpi_hotplug_notify_cb, handler); + adev->flags.hotplug_notify = true; break; } } +} -out: - acpi_free_pnp_ids(&pnp); +u32 __weak arch_acpi_add_auto_dep(acpi_handle handle) { return 0; } + +static u32 acpi_scan_check_dep(acpi_handle handle) +{ + struct acpi_handle_list dep_devices; + u32 count = 0; + + /* + * Some architectures like RISC-V need to add dependencies for + * all devices which use GSI to the interrupt controller so that + * interrupt controller is probed before any of those devices. + * Instead of mandating _DEP on all the devices, detect the + * dependency and add automatically. + */ + count += arch_acpi_add_auto_dep(handle); + + /* + * Check for _HID here to avoid deferring the enumeration of: + * 1. PCI devices. + * 2. ACPI nodes describing USB ports. + * Still, checking for _HID catches more then just these cases ... + */ + if (!acpi_has_method(handle, "_DEP") || !acpi_has_method(handle, "_HID")) + return count; + + if (!acpi_evaluate_reference(handle, "_DEP", NULL, &dep_devices)) { + acpi_handle_debug(handle, "Failed to evaluate _DEP.\n"); + return count; + } + + count += acpi_scan_add_dep(handle, &dep_devices); + return count; } -static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl_not_used, - void *not_used, void **return_value) +static acpi_status acpi_scan_check_crs_csi2_cb(acpi_handle handle, u32 a, void *b, void **c) { - struct acpi_device *device = NULL; + acpi_mipi_check_crs_csi2(handle); + return AE_OK; +} + +static acpi_status acpi_bus_check_add(acpi_handle handle, bool first_pass, + struct acpi_device **adev_p) +{ + struct acpi_device *device = acpi_fetch_acpi_dev(handle); + acpi_object_type acpi_type; int type; - unsigned long long sta; - acpi_status status; - int result; - acpi_bus_get_device(handle, &device); if (device) goto out; - result = acpi_bus_type_and_status(handle, &type, &sta); - if (result) + if (ACPI_FAILURE(acpi_get_type(handle, &acpi_type))) return AE_OK; - if (type == ACPI_BUS_TYPE_POWER) { - acpi_add_power_resource(handle); - return AE_OK; - } + switch (acpi_type) { + case ACPI_TYPE_DEVICE: + if (acpi_device_should_be_hidden(handle)) + return AE_OK; + + if (first_pass) { + acpi_mipi_check_crs_csi2(handle); + + /* Bail out if there are dependencies. */ + if (acpi_scan_check_dep(handle) > 0) { + /* + * The entire CSI-2 connection graph needs to be + * extracted before any drivers or scan handlers + * are bound to struct device objects, so scan + * _CRS CSI-2 resource descriptors for all + * devices below the current handle. + */ + acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, + ACPI_UINT32_MAX, + acpi_scan_check_crs_csi2_cb, + NULL, NULL, NULL); + return AE_CTRL_DEPTH; + } + } - acpi_scan_init_hotplug(handle, type); + fallthrough; + case ACPI_TYPE_ANY: /* for ACPI_ROOT_OBJECT */ + type = ACPI_BUS_TYPE_DEVICE; + break; - if (!(sta & ACPI_STA_DEVICE_PRESENT) && - !(sta & ACPI_STA_DEVICE_FUNCTIONING)) { - struct acpi_device_wakeup wakeup; - acpi_handle temp; + case ACPI_TYPE_PROCESSOR: + type = ACPI_BUS_TYPE_PROCESSOR; + break; - status = acpi_get_handle(handle, "_PRW", &temp); - if (ACPI_SUCCESS(status)) { - acpi_bus_extract_wakeup_device_power_package(handle, - &wakeup); - acpi_power_resources_list_free(&wakeup.resources); - } - return AE_CTRL_DEPTH; + case ACPI_TYPE_THERMAL: + type = ACPI_BUS_TYPE_THERMAL; + break; + + case ACPI_TYPE_POWER: + acpi_add_power_resource(handle); + fallthrough; + default: + return AE_OK; } - acpi_add_single_object(&device, handle, type, sta); + /* + * If first_pass is true at this point, the device has no dependencies, + * or the creation of the device object would have been postponed above. + */ + acpi_add_single_object(&device, handle, type, !first_pass); if (!device) return AE_CTRL_DEPTH; - out: - if (!*return_value) - *return_value = device; + acpi_scan_init_hotplug(device); + +out: + if (!*adev_p) + *adev_p = device; return AE_OK; } +static acpi_status acpi_bus_check_add_1(acpi_handle handle, u32 lvl_not_used, + void *not_used, void **ret_p) +{ + return acpi_bus_check_add(handle, true, (struct acpi_device **)ret_p); +} + +static acpi_status acpi_bus_check_add_2(acpi_handle handle, u32 lvl_not_used, + void *not_used, void **ret_p) +{ + return acpi_bus_check_add(handle, false, (struct acpi_device **)ret_p); +} + +static void acpi_default_enumeration(struct acpi_device *device) +{ + /* + * Do not enumerate devices with enumeration_by_parent flag set as + * they will be enumerated by their respective parents. + */ + if (!device->flags.enumeration_by_parent) { + acpi_create_platform_device(device, NULL); + acpi_device_set_enumerated(device); + } else { + blocking_notifier_call_chain(&acpi_reconfig_chain, + ACPI_RECONFIG_DEVICE_ADD, device); + } +} + +static const struct acpi_device_id generic_device_ids[] = { + {ACPI_DT_NAMESPACE_HID, }, + {"", }, +}; + +static int acpi_generic_device_attach(struct acpi_device *adev, + const struct acpi_device_id *not_used) +{ + /* + * Since ACPI_DT_NAMESPACE_HID is the only ID handled here, the test + * below can be unconditional. + */ + if (adev->data.of_compatible) + acpi_default_enumeration(adev); + + return 1; +} + +static struct acpi_scan_handler generic_device_handler = { + .ids = generic_device_ids, + .attach = acpi_generic_device_attach, +}; + static int acpi_scan_attach_handler(struct acpi_device *device) { struct acpi_hardware_id *hwid; @@ -1952,41 +2252,323 @@ static int acpi_scan_attach_handler(struct acpi_device *device) handler = acpi_scan_match_handler(hwid->id, &devid); if (handler) { + if (!handler->attach) { + device->pnp.type.platform_id = 0; + continue; + } + device->handler = handler; ret = handler->attach(device, devid); - if (ret > 0) { - device->handler = handler; + if (ret > 0) break; - } else if (ret < 0) { + + device->handler = NULL; + if (ret < 0) break; - } } } + return ret; } -static acpi_status acpi_bus_device_attach(acpi_handle handle, u32 lvl_not_used, - void *not_used, void **ret_not_used) +static int acpi_bus_attach(struct acpi_device *device, void *first_pass) { - struct acpi_device *device; - unsigned long long sta_not_used; + bool skip = !first_pass && device->flags.visited; + acpi_handle ejd; int ret; - /* - * Ignore errors ignored by acpi_bus_check_add() to avoid terminating - * namespace walks prematurely. - */ - if (acpi_bus_type_and_status(handle, &ret, &sta_not_used)) - return AE_OK; + if (skip) + goto ok; - if (acpi_bus_get_device(handle, &device)) - return AE_CTRL_DEPTH; + if (ACPI_SUCCESS(acpi_bus_get_ejd(device->handle, &ejd))) + register_dock_dependent_device(device, ejd); + + acpi_bus_get_status(device); + /* Skip devices that are not ready for enumeration (e.g. not present) */ + if (!acpi_dev_ready_for_enumeration(device)) { + device->flags.initialized = false; + acpi_device_clear_enumerated(device); + device->flags.power_manageable = 0; + return 0; + } + if (device->handler) + goto ok; + + acpi_ec_register_opregions(device); + + if (!device->flags.initialized) { + device->flags.power_manageable = + device->power.states[ACPI_STATE_D0].flags.valid; + if (acpi_bus_init_power(device)) + device->flags.power_manageable = 0; + + device->flags.initialized = true; + } else if (device->flags.visited) { + goto ok; + } ret = acpi_scan_attach_handler(device); - if (ret) - return ret > 0 ? AE_OK : AE_CTRL_DEPTH; + if (ret < 0) + return 0; + + device->flags.match_driver = true; + if (ret > 0 && !device->flags.enumeration_by_parent) { + acpi_device_set_enumerated(device); + goto ok; + } ret = device_attach(&device->dev); - return ret >= 0 ? AE_OK : AE_CTRL_DEPTH; + if (ret < 0) + return 0; + + if (device->pnp.type.platform_id || device->flags.enumeration_by_parent) + acpi_default_enumeration(device); + else + acpi_device_set_enumerated(device); + +ok: + acpi_dev_for_each_child(device, acpi_bus_attach, first_pass); + + if (!skip && device->handler && device->handler->hotplug.notify_online) + device->handler->hotplug.notify_online(device); + + return 0; +} + +static int acpi_dev_get_next_consumer_dev_cb(struct acpi_dep_data *dep, void *data) +{ + struct acpi_device **adev_p = data; + struct acpi_device *adev = *adev_p; + + /* + * If we're passed a 'previous' consumer device then we need to skip + * any consumers until we meet the previous one, and then NULL @data + * so the next one can be returned. + */ + if (adev) { + if (dep->consumer == adev->handle) + *adev_p = NULL; + + return 0; + } + + adev = acpi_get_acpi_dev(dep->consumer); + if (adev) { + *(struct acpi_device **)data = adev; + return 1; + } + /* Continue parsing if the device object is not present. */ + return 0; +} + +struct acpi_scan_clear_dep_work { + struct work_struct work; + struct acpi_device *adev; +}; + +static void acpi_scan_clear_dep_fn(struct work_struct *work) +{ + struct acpi_scan_clear_dep_work *cdw; + + cdw = container_of(work, struct acpi_scan_clear_dep_work, work); + + acpi_scan_lock_acquire(); + acpi_bus_attach(cdw->adev, (void *)true); + acpi_scan_lock_release(); + + acpi_dev_put(cdw->adev); + kfree(cdw); +} + +static bool acpi_scan_clear_dep_queue(struct acpi_device *adev) +{ + struct acpi_scan_clear_dep_work *cdw; + + if (adev->dep_unmet) + return false; + + cdw = kmalloc(sizeof(*cdw), GFP_KERNEL); + if (!cdw) + return false; + + cdw->adev = adev; + INIT_WORK(&cdw->work, acpi_scan_clear_dep_fn); + /* + * Since the work function may block on the lock until the entire + * initial enumeration of devices is complete, put it into the unbound + * workqueue. + */ + queue_work(system_dfl_wq, &cdw->work); + + return true; +} + +static void acpi_scan_delete_dep_data(struct acpi_dep_data *dep) +{ + list_del(&dep->node); + kfree(dep); +} + +static int acpi_scan_clear_dep(struct acpi_dep_data *dep, void *data) +{ + struct acpi_device *adev = acpi_get_acpi_dev(dep->consumer); + + if (adev) { + adev->dep_unmet--; + if (!acpi_scan_clear_dep_queue(adev)) + acpi_dev_put(adev); + } + + if (dep->free_when_met) + acpi_scan_delete_dep_data(dep); + else + dep->met = true; + + return 0; +} + +/** + * acpi_walk_dep_device_list - Apply a callback to every entry in acpi_dep_list + * @handle: The ACPI handle of the supplier device + * @callback: Pointer to the callback function to apply + * @data: Pointer to some data to pass to the callback + * + * The return value of the callback determines this function's behaviour. If 0 + * is returned we continue to iterate over acpi_dep_list. If a positive value + * is returned then the loop is broken but this function returns 0. If a + * negative value is returned by the callback then the loop is broken and that + * value is returned as the final error. + */ +static int acpi_walk_dep_device_list(acpi_handle handle, + int (*callback)(struct acpi_dep_data *, void *), + void *data) +{ + struct acpi_dep_data *dep, *tmp; + int ret = 0; + + mutex_lock(&acpi_dep_list_lock); + list_for_each_entry_safe(dep, tmp, &acpi_dep_list, node) { + if (dep->supplier == handle) { + ret = callback(dep, data); + if (ret) + break; + } + } + mutex_unlock(&acpi_dep_list_lock); + + return ret > 0 ? 0 : ret; +} + +/** + * acpi_dev_clear_dependencies - Inform consumers that the device is now active + * @supplier: Pointer to the supplier &struct acpi_device + * + * Clear dependencies on the given device. + */ +void acpi_dev_clear_dependencies(struct acpi_device *supplier) +{ + acpi_walk_dep_device_list(supplier->handle, acpi_scan_clear_dep, NULL); +} +EXPORT_SYMBOL_GPL(acpi_dev_clear_dependencies); + +/** + * acpi_dev_ready_for_enumeration - Check if the ACPI device is ready for enumeration + * @device: Pointer to the &struct acpi_device to check + * + * Check if the device is present and has no unmet dependencies. + * + * Return true if the device is ready for enumeratino. Otherwise, return false. + */ +bool acpi_dev_ready_for_enumeration(const struct acpi_device *device) +{ + if (device->flags.honor_deps && device->dep_unmet) + return false; + + return acpi_device_is_present(device); +} +EXPORT_SYMBOL_GPL(acpi_dev_ready_for_enumeration); + +/** + * acpi_dev_get_next_consumer_dev - Return the next adev dependent on @supplier + * @supplier: Pointer to the dependee device + * @start: Pointer to the current dependent device + * + * Returns the next &struct acpi_device which declares itself dependent on + * @supplier via the _DEP buffer, parsed from the acpi_dep_list. + * + * If the returned adev is not passed as @start to this function, the caller is + * responsible for putting the reference to adev when it is no longer needed. + */ +struct acpi_device *acpi_dev_get_next_consumer_dev(struct acpi_device *supplier, + struct acpi_device *start) +{ + struct acpi_device *adev = start; + + acpi_walk_dep_device_list(supplier->handle, + acpi_dev_get_next_consumer_dev_cb, &adev); + + acpi_dev_put(start); + + if (adev == start) + return NULL; + + return adev; +} +EXPORT_SYMBOL_GPL(acpi_dev_get_next_consumer_dev); + +static void acpi_scan_postponed_branch(acpi_handle handle) +{ + struct acpi_device *adev = NULL; + + if (ACPI_FAILURE(acpi_bus_check_add(handle, false, &adev))) + return; + + acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX, + acpi_bus_check_add_2, NULL, NULL, (void **)&adev); + + /* + * Populate the ACPI _CRS CSI-2 software nodes for the ACPI devices that + * have been added above. + */ + acpi_mipi_init_crs_csi2_swnodes(); + + acpi_bus_attach(adev, NULL); +} + +static void acpi_scan_postponed(void) +{ + struct acpi_dep_data *dep, *tmp; + + mutex_lock(&acpi_dep_list_lock); + + list_for_each_entry_safe(dep, tmp, &acpi_dep_list, node) { + acpi_handle handle = dep->consumer; + + /* + * In case there are multiple acpi_dep_list entries with the + * same consumer, skip the current entry if the consumer device + * object corresponding to it is present already. + */ + if (!acpi_fetch_acpi_dev(handle)) { + /* + * Even though the lock is released here, tmp is + * guaranteed to be valid, because none of the list + * entries following dep is marked as "free when met" + * and so they cannot be deleted. + */ + mutex_unlock(&acpi_dep_list_lock); + + acpi_scan_postponed_branch(handle); + + mutex_lock(&acpi_dep_list_lock); + } + + if (dep->met) + acpi_scan_delete_dep_data(dep); + else + dep->free_when_met = true; + } + + mutex_unlock(&acpi_dep_list_lock); } /** @@ -2005,160 +2587,256 @@ static acpi_status acpi_bus_device_attach(acpi_handle handle, u32 lvl_not_used, */ int acpi_bus_scan(acpi_handle handle) { - void *device = NULL; - int error = 0; + struct acpi_device *device = NULL; - if (ACPI_SUCCESS(acpi_bus_check_add(handle, 0, NULL, &device))) - acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX, - acpi_bus_check_add, NULL, NULL, &device); + /* Pass 1: Avoid enumerating devices with missing dependencies. */ - if (!device) - error = -ENODEV; - else if (ACPI_SUCCESS(acpi_bus_device_attach(handle, 0, NULL, NULL))) + if (ACPI_SUCCESS(acpi_bus_check_add(handle, true, &device))) acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX, - acpi_bus_device_attach, NULL, NULL, NULL); - - return error; -} -EXPORT_SYMBOL(acpi_bus_scan); + acpi_bus_check_add_1, NULL, NULL, + (void **)&device); -static acpi_status acpi_bus_device_detach(acpi_handle handle, u32 lvl_not_used, - void *not_used, void **ret_not_used) -{ - struct acpi_device *device = NULL; + if (!device) + return -ENODEV; - if (!acpi_bus_get_device(handle, &device)) { - struct acpi_scan_handler *dev_handler = device->handler; + /* + * Set up ACPI _CRS CSI-2 software nodes using information extracted + * from the _CRS CSI-2 resource descriptors during the ACPI namespace + * walk above and MIPI DisCo for Imaging device properties. + */ + acpi_mipi_scan_crs_csi2(); + acpi_mipi_init_crs_csi2_swnodes(); - if (dev_handler) { - if (dev_handler->detach) - dev_handler->detach(device); + acpi_bus_attach(device, (void *)true); - device->handler = NULL; - } else { - device_release_driver(&device->dev); - } - } - return AE_OK; -} + /* Pass 2: Enumerate all of the remaining devices. */ -static acpi_status acpi_bus_remove(acpi_handle handle, u32 lvl_not_used, - void *not_used, void **ret_not_used) -{ - struct acpi_device *device = NULL; + acpi_scan_postponed(); - if (!acpi_bus_get_device(handle, &device)) - acpi_device_unregister(device); + acpi_mipi_crs_csi2_cleanup(); - return AE_OK; + return 0; } +EXPORT_SYMBOL(acpi_bus_scan); /** - * acpi_bus_trim - Remove ACPI device node and all of its descendants - * @start: Root of the ACPI device nodes subtree to remove. + * acpi_bus_trim - Detach scan handlers and drivers from ACPI device objects. + * @adev: Root of the ACPI namespace scope to walk. * * Must be called under acpi_scan_lock. */ -void acpi_bus_trim(struct acpi_device *start) +void acpi_bus_trim(struct acpi_device *adev) { - /* - * Execute acpi_bus_device_detach() as a post-order callback to detach - * all ACPI drivers from the device nodes being removed. - */ - acpi_walk_namespace(ACPI_TYPE_ANY, start->handle, ACPI_UINT32_MAX, NULL, - acpi_bus_device_detach, NULL, NULL); - acpi_bus_device_detach(start->handle, 0, NULL, NULL); - /* - * Execute acpi_bus_remove() as a post-order callback to remove device - * nodes in the given namespace scope. - */ - acpi_walk_namespace(ACPI_TYPE_ANY, start->handle, ACPI_UINT32_MAX, NULL, - acpi_bus_remove, NULL, NULL); - acpi_bus_remove(start->handle, 0, NULL, NULL); + uintptr_t flags = 0; + + acpi_scan_check_and_detach(adev, (void *)flags); } EXPORT_SYMBOL_GPL(acpi_bus_trim); -static int acpi_bus_scan_fixed(void) +int acpi_bus_register_early_device(int type) { - int result = 0; - - /* - * Enumerate all fixed-feature devices. - */ - if (!(acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON)) { - struct acpi_device *device = NULL; + struct acpi_device *device = NULL; + int result; - result = acpi_add_single_object(&device, NULL, - ACPI_BUS_TYPE_POWER_BUTTON, - ACPI_STA_DEFAULT); - if (result) - return result; + result = acpi_add_single_object(&device, NULL, type, false); + if (result) + return result; - result = device_attach(&device->dev); - if (result < 0) - return result; + device->flags.match_driver = true; + return device_attach(&device->dev); +} +EXPORT_SYMBOL_GPL(acpi_bus_register_early_device); - device_init_wakeup(&device->dev, true); +static void acpi_bus_scan_fixed(void) +{ + if (!(acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON)) { + struct acpi_device *adev = NULL; + + acpi_add_single_object(&adev, NULL, ACPI_BUS_TYPE_POWER_BUTTON, + false); + if (adev) { + adev->flags.match_driver = true; + if (device_attach(&adev->dev) >= 0) + device_init_wakeup(&adev->dev, true); + else + dev_dbg(&adev->dev, "No driver\n"); + } } if (!(acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON)) { - struct acpi_device *device = NULL; + struct acpi_device *adev = NULL; + + acpi_add_single_object(&adev, NULL, ACPI_BUS_TYPE_SLEEP_BUTTON, + false); + if (adev) { + adev->flags.match_driver = true; + if (device_attach(&adev->dev) < 0) + dev_dbg(&adev->dev, "No driver\n"); + } + } +} - result = acpi_add_single_object(&device, NULL, - ACPI_BUS_TYPE_SLEEP_BUTTON, - ACPI_STA_DEFAULT); - if (result) - return result; +static void __init acpi_get_spcr_uart_addr(void) +{ + acpi_status status; + struct acpi_table_spcr *spcr_ptr; - result = device_attach(&device->dev); + status = acpi_get_table(ACPI_SIG_SPCR, 0, + (struct acpi_table_header **)&spcr_ptr); + if (ACPI_FAILURE(status)) { + pr_warn("STAO table present, but SPCR is missing\n"); + return; } - return result < 0 ? result : 0; + spcr_uart_addr = spcr_ptr->serial_port.address; + acpi_put_table((struct acpi_table_header *)spcr_ptr); } -int __init acpi_scan_init(void) -{ - int result; +static bool acpi_scan_initialized; - result = bus_register(&acpi_bus_type); - if (result) { - /* We don't want to quit even if we failed to add suspend/resume */ - printk(KERN_ERR PREFIX "Could not register bus type\n"); - } +void __init acpi_scan_init(void) +{ + acpi_status status; + struct acpi_table_stao *stao_ptr; acpi_pci_root_init(); acpi_pci_link_init(); acpi_processor_init(); acpi_platform_init(); acpi_lpss_init(); + acpi_apd_init(); acpi_cmos_rtc_init(); acpi_container_init(); acpi_memory_hotplug_init(); - acpi_dock_init(); + acpi_watchdog_init(); + acpi_pnp_init(); + acpi_power_resources_init(); + acpi_init_lpit(); + + acpi_scan_add_handler(&generic_device_handler); - mutex_lock(&acpi_scan_lock); /* - * Enumerate devices in the ACPI namespace. + * If there is STAO table, check whether it needs to ignore the UART + * device in SPCR table. */ - result = acpi_bus_scan(ACPI_ROOT_OBJECT); - if (result) - goto out; + status = acpi_get_table(ACPI_SIG_STAO, 0, + (struct acpi_table_header **)&stao_ptr); + if (ACPI_SUCCESS(status)) { + if (stao_ptr->header.length > sizeof(struct acpi_table_stao)) + pr_info("STAO Name List not yet supported.\n"); - result = acpi_bus_get_device(ACPI_ROOT_OBJECT, &acpi_root); - if (result) - goto out; + if (stao_ptr->ignore_uart) + acpi_get_spcr_uart_addr(); - result = acpi_bus_scan_fixed(); - if (result) { - acpi_device_unregister(acpi_root); - goto out; + acpi_put_table((struct acpi_table_header *)stao_ptr); } + acpi_gpe_apply_masked_gpes(); acpi_update_all_gpes(); - acpi_pci_root_hp_init(); + /* + * Although we call __add_memory() that is documented to require the + * device_hotplug_lock, it is not necessary here because this is an + * early code when userspace or any other code path cannot trigger + * hotplug/hotunplug operations. + */ + mutex_lock(&acpi_scan_lock); + /* + * Enumerate devices in the ACPI namespace. + */ + if (acpi_bus_scan(ACPI_ROOT_OBJECT)) + goto unlock; - out: + acpi_root = acpi_fetch_acpi_dev(ACPI_ROOT_OBJECT); + if (!acpi_root) + goto unlock; + + /* Fixed feature devices do not exist on HW-reduced platform */ + if (!acpi_gbl_reduced_hardware) + acpi_bus_scan_fixed(); + + acpi_turn_off_unused_power_resources(); + + acpi_scan_initialized = true; + +unlock: mutex_unlock(&acpi_scan_lock); - return result; } + +static struct acpi_probe_entry *ape; +static int acpi_probe_count; +static DEFINE_MUTEX(acpi_probe_mutex); + +static int __init acpi_match_madt(union acpi_subtable_headers *header, + const unsigned long end) +{ + if (!ape->subtable_valid || ape->subtable_valid(&header->common, ape)) + if (!ape->probe_subtbl(header, end)) + acpi_probe_count++; + + return 0; +} + +void __weak arch_sort_irqchip_probe(struct acpi_probe_entry *ap_head, int nr) { } + +int __init __acpi_probe_device_table(struct acpi_probe_entry *ap_head, int nr) +{ + int count = 0; + + if (acpi_disabled) + return 0; + + mutex_lock(&acpi_probe_mutex); + arch_sort_irqchip_probe(ap_head, nr); + for (ape = ap_head; nr; ape++, nr--) { + if (ACPI_COMPARE_NAMESEG(ACPI_SIG_MADT, ape->id)) { + acpi_probe_count = 0; + acpi_table_parse_madt(ape->type, acpi_match_madt, 0); + count += acpi_probe_count; + } else { + int res; + res = acpi_table_parse(ape->id, ape->probe_table); + if (!res) + count++; + } + } + mutex_unlock(&acpi_probe_mutex); + + return count; +} + +static void acpi_table_events_fn(struct work_struct *work) +{ + acpi_scan_lock_acquire(); + acpi_bus_scan(ACPI_ROOT_OBJECT); + acpi_scan_lock_release(); + + kfree(work); +} + +void acpi_scan_table_notify(void) +{ + struct work_struct *work; + + if (!acpi_scan_initialized) + return; + + work = kmalloc(sizeof(*work), GFP_KERNEL); + if (!work) + return; + + INIT_WORK(work, acpi_table_events_fn); + schedule_work(work); +} + +int acpi_reconfig_notifier_register(struct notifier_block *nb) +{ + return blocking_notifier_chain_register(&acpi_reconfig_chain, nb); +} +EXPORT_SYMBOL(acpi_reconfig_notifier_register); + +int acpi_reconfig_notifier_unregister(struct notifier_block *nb) +{ + return blocking_notifier_chain_unregister(&acpi_reconfig_chain, nb); +} +EXPORT_SYMBOL(acpi_reconfig_notifier_unregister); |