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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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ACPI: convert to sysfs framework
Setup new sysfs framework 1. Remove /sys/firmware/acpi 2. Add ACPI device in device tree. File "eject" for every device that has _EJ0 method is moved from /sys/firmware to /sys/devices. Operation on this file is exactly the same as before. i.e. echo 1 to "eject" will cause hot removal of this device. Corresponding changes should be made in userspace for hot removal. Signed-off-by: Li Shaohua <shaohua.li@intel.com> Signed-off-by: Zhang Rui<rui.zhang@intel.com> Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Patrick Mochel
Len Brown
parent
a7178df5e7
commit
f883d9db00
@ -195,7 +195,7 @@ int acpi_bus_set_power(acpi_handle handle, int state)
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if (!device->flags.power_manageable) {
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ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device `[%s]' is not power manageable\n",
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device->kobj.name));
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device->dev.kobj.name));
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return -ENODEV;
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}
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/*
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@ -168,7 +168,7 @@ static void container_notify_cb(acpi_handle handle, u32 type, void *context)
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if (ACPI_FAILURE(status) || !device) {
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result = container_device_add(&device, handle);
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if (!result)
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kobject_uevent(&device->kobj,
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kobject_uevent(&device->dev.kobj,
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KOBJ_ONLINE);
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else
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printk("Failed to add container\n");
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@ -176,13 +176,13 @@ static void container_notify_cb(acpi_handle handle, u32 type, void *context)
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} else {
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if (ACPI_SUCCESS(status)) {
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/* device exist and this is a remove request */
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kobject_uevent(&device->kobj, KOBJ_OFFLINE);
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kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
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}
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}
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break;
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case ACPI_NOTIFY_EJECT_REQUEST:
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if (!acpi_bus_get_device(handle, &device) && device) {
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kobject_uevent(&device->kobj, KOBJ_OFFLINE);
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kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
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}
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break;
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default:
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@ -711,7 +711,7 @@ int acpi_processor_device_add(acpi_handle handle, struct acpi_device **device)
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return -ENODEV;
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if ((pr->id >= 0) && (pr->id < NR_CPUS)) {
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kobject_uevent(&(*device)->kobj, KOBJ_ONLINE);
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kobject_uevent(&(*device)->dev.kobj, KOBJ_ONLINE);
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}
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return 0;
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}
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@ -749,13 +749,13 @@ acpi_processor_hotplug_notify(acpi_handle handle, u32 event, void *data)
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}
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if (pr->id >= 0 && (pr->id < NR_CPUS)) {
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kobject_uevent(&device->kobj, KOBJ_OFFLINE);
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kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
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break;
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}
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result = acpi_processor_start(device);
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if ((!result) && ((pr->id >= 0) && (pr->id < NR_CPUS))) {
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kobject_uevent(&device->kobj, KOBJ_ONLINE);
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kobject_uevent(&device->dev.kobj, KOBJ_ONLINE);
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} else {
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printk(KERN_ERR PREFIX "Device [%s] failed to start\n",
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acpi_device_bid(device));
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@ -778,7 +778,7 @@ acpi_processor_hotplug_notify(acpi_handle handle, u32 event, void *data)
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}
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if ((pr->id < NR_CPUS) && (cpu_present(pr->id)))
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kobject_uevent(&device->kobj, KOBJ_OFFLINE);
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kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
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break;
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default:
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ACPI_DEBUG_PRINT((ACPI_DB_INFO,
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@ -24,126 +24,6 @@ static LIST_HEAD(acpi_device_list);
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DEFINE_SPINLOCK(acpi_device_lock);
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LIST_HEAD(acpi_wakeup_device_list);
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static void acpi_device_release_legacy(struct kobject *kobj)
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{
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struct acpi_device *dev = container_of(kobj, struct acpi_device, kobj);
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kfree(dev->pnp.cid_list);
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kfree(dev);
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}
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struct acpi_device_attribute {
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struct attribute attr;
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ssize_t(*show) (struct acpi_device *, char *);
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ssize_t(*store) (struct acpi_device *, const char *, size_t);
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};
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typedef void acpi_device_sysfs_files(struct kobject *,
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const struct attribute *);
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static void setup_sys_fs_device_files(struct acpi_device *dev,
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acpi_device_sysfs_files * func);
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#define create_sysfs_device_files(dev) \
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setup_sys_fs_device_files(dev, (acpi_device_sysfs_files *)&sysfs_create_file)
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#define remove_sysfs_device_files(dev) \
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setup_sys_fs_device_files(dev, (acpi_device_sysfs_files *)&sysfs_remove_file)
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#define to_acpi_dev(n) container_of(n, struct acpi_device, kobj)
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#define to_handle_attr(n) container_of(n, struct acpi_device_attribute, attr);
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static ssize_t acpi_device_attr_show(struct kobject *kobj,
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struct attribute *attr, char *buf)
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{
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struct acpi_device *device = to_acpi_dev(kobj);
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struct acpi_device_attribute *attribute = to_handle_attr(attr);
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return attribute->show ? attribute->show(device, buf) : -EIO;
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}
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static ssize_t acpi_device_attr_store(struct kobject *kobj,
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struct attribute *attr, const char *buf,
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size_t len)
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{
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struct acpi_device *device = to_acpi_dev(kobj);
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struct acpi_device_attribute *attribute = to_handle_attr(attr);
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return attribute->store ? attribute->store(device, buf, len) : -EIO;
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}
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static struct sysfs_ops acpi_device_sysfs_ops = {
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.show = acpi_device_attr_show,
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.store = acpi_device_attr_store,
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};
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static struct kobj_type ktype_acpi_ns = {
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.sysfs_ops = &acpi_device_sysfs_ops,
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.release = acpi_device_release_legacy,
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};
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static int namespace_uevent(struct kset *kset, struct kobject *kobj,
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char **envp, int num_envp, char *buffer,
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int buffer_size)
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{
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struct acpi_device *dev = to_acpi_dev(kobj);
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int i = 0;
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int len = 0;
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if (!dev->driver)
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return 0;
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if (add_uevent_var(envp, num_envp, &i, buffer, buffer_size, &len,
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"PHYSDEVDRIVER=%s", dev->driver->name))
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return -ENOMEM;
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envp[i] = NULL;
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return 0;
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}
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static struct kset_uevent_ops namespace_uevent_ops = {
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.uevent = &namespace_uevent,
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};
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static struct kset acpi_namespace_kset = {
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.kobj = {
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.name = "namespace",
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},
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.subsys = &acpi_subsys,
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.ktype = &ktype_acpi_ns,
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.uevent_ops = &namespace_uevent_ops,
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};
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/* --------------------------------------------------------------------------
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ACPI sysfs device file support
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-------------------------------------------------------------------------- */
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static ssize_t acpi_eject_store(struct acpi_device *device,
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const char *buf, size_t count);
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#define ACPI_DEVICE_ATTR(_name,_mode,_show,_store) \
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static struct acpi_device_attribute acpi_device_attr_##_name = \
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__ATTR(_name, _mode, _show, _store)
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ACPI_DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);
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/**
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* setup_sys_fs_device_files - sets up the device files under device namespace
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* @dev: acpi_device object
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* @func: function pointer to create or destroy the device file
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*/
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static void
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setup_sys_fs_device_files(struct acpi_device *dev,
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acpi_device_sysfs_files * func)
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{
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acpi_status status;
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acpi_handle temp = NULL;
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/*
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* If device has _EJ0, 'eject' file is created that is used to trigger
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* hot-removal function from userland.
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*/
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status = acpi_get_handle(dev->handle, "_EJ0", &temp);
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if (ACPI_SUCCESS(status))
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(*(func)) (&dev->kobj, &acpi_device_attr_eject.attr);
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}
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static int acpi_eject_operation(acpi_handle handle, int lockable)
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{
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struct acpi_object_list arg_list;
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@ -180,7 +60,8 @@ static int acpi_eject_operation(acpi_handle handle, int lockable)
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}
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static ssize_t
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acpi_eject_store(struct acpi_device *device, const char *buf, size_t count)
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acpi_eject_store(struct device *d, struct device_attribute *attr,
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const char *buf, size_t count)
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{
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int result;
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int ret = count;
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@ -188,26 +69,27 @@ acpi_eject_store(struct acpi_device *device, const char *buf, size_t count)
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acpi_status status;
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acpi_handle handle;
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acpi_object_type type = 0;
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struct acpi_device *acpi_device = to_acpi_device(d);
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if ((!count) || (buf[0] != '1')) {
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return -EINVAL;
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}
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#ifndef FORCE_EJECT
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if (device->driver == NULL) {
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if (acpi_device->driver == NULL) {
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ret = -ENODEV;
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goto err;
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}
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#endif
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status = acpi_get_type(device->handle, &type);
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if (ACPI_FAILURE(status) || (!device->flags.ejectable)) {
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status = acpi_get_type(acpi_device->handle, &type);
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if (ACPI_FAILURE(status) || (!acpi_device->flags.ejectable)) {
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ret = -ENODEV;
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goto err;
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}
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islockable = device->flags.lockable;
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handle = device->handle;
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islockable = acpi_device->flags.lockable;
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handle = acpi_device->handle;
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result = acpi_bus_trim(device, 1);
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result = acpi_bus_trim(acpi_device, 1);
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if (!result)
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result = acpi_eject_operation(handle, islockable);
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@ -219,6 +101,35 @@ acpi_eject_store(struct acpi_device *device, const char *buf, size_t count)
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return ret;
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}
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static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);
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static void acpi_device_setup_files(struct acpi_device *dev)
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{
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acpi_status status;
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acpi_handle temp;
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/*
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* If device has _EJ0, 'eject' file is created that is used to trigger
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* hot-removal function from userland.
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*/
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status = acpi_get_handle(dev->handle, "_EJ0", &temp);
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if (ACPI_SUCCESS(status))
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device_create_file(&dev->dev, &dev_attr_eject);
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}
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static void acpi_device_remove_files(struct acpi_device *dev)
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{
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acpi_status status;
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acpi_handle temp;
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/*
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* If device has _EJ0, 'eject' file is created that is used to trigger
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* hot-removal function from userland.
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*/
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status = acpi_get_handle(dev->handle, "_EJ0", &temp);
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if (ACPI_SUCCESS(status))
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device_remove_file(&dev->dev, &dev_attr_eject);
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}
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/* --------------------------------------------------------------------------
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ACPI Bus operations
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-------------------------------------------------------------------------- */
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@ -353,8 +264,6 @@ static struct bus_type acpi_bus_type = {
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static void acpi_device_register(struct acpi_device *device,
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struct acpi_device *parent)
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{
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int err;
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/*
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* Linkage
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* -------
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@ -375,17 +284,6 @@ static void acpi_device_register(struct acpi_device *device,
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list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
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spin_unlock(&acpi_device_lock);
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strlcpy(device->kobj.name, device->pnp.bus_id, KOBJ_NAME_LEN);
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if (parent)
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device->kobj.parent = &parent->kobj;
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device->kobj.ktype = &ktype_acpi_ns;
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device->kobj.kset = &acpi_namespace_kset;
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err = kobject_register(&device->kobj);
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if (err < 0)
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printk(KERN_WARNING "%s: kobject_register error: %d\n",
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__FUNCTION__, err);
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create_sysfs_device_files(device);
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if (device->parent)
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device->dev.parent = &parent->dev;
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device->dev.bus = &acpi_bus_type;
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@ -393,6 +291,8 @@ static void acpi_device_register(struct acpi_device *device,
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sprintf(device->dev.bus_id, "%s", device->pnp.bus_id);
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device->dev.release = &acpi_device_release;
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device_add(&device->dev);
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acpi_device_setup_files(device);
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}
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static void acpi_device_unregister(struct acpi_device *device, int type)
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@ -409,9 +309,8 @@ static void acpi_device_unregister(struct acpi_device *device, int type)
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spin_unlock(&acpi_device_lock);
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acpi_detach_data(device->handle, acpi_bus_data_handler);
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remove_sysfs_device_files(device);
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kobject_unregister(&device->kobj);
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acpi_device_remove_files(device);
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device_unregister(&device->dev);
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}
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@ -1353,10 +1252,6 @@ static int __init acpi_scan_init(void)
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if (acpi_disabled)
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return 0;
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result = kset_register(&acpi_namespace_kset);
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if (result < 0)
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printk(KERN_ERR PREFIX "kset_register error: %d\n", result);
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result = bus_register(&acpi_bus_type);
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if (result) {
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/* We don't want to quit even if we failed to add suspend/resume */
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@ -299,7 +299,6 @@ struct acpi_device {
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struct acpi_device_ops ops;
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struct acpi_driver *driver;
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void *driver_data;
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struct kobject kobj;
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struct device dev;
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};
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