/* * File attributes for Mediated devices * * Copyright (c) 2016, NVIDIA CORPORATION. All rights reserved. * Author: Neo Jia * Kirti Wankhede * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ #include #include #include #include #include #include #include "mdev_private.h" /* Static functions */ static ssize_t mdev_type_attr_show(struct kobject *kobj, struct attribute *__attr, char *buf) { struct mdev_type_attribute *attr = to_mdev_type_attr(__attr); struct mdev_type *type = to_mdev_type(kobj); ssize_t ret = -EIO; if (attr->show) ret = attr->show(kobj, type->parent->dev, buf); return ret; } static ssize_t mdev_type_attr_store(struct kobject *kobj, struct attribute *__attr, const char *buf, size_t count) { struct mdev_type_attribute *attr = to_mdev_type_attr(__attr); struct mdev_type *type = to_mdev_type(kobj); ssize_t ret = -EIO; if (attr->store) ret = attr->store(&type->kobj, type->parent->dev, buf, count); return ret; } static const struct sysfs_ops mdev_type_sysfs_ops = { .show = mdev_type_attr_show, .store = mdev_type_attr_store, }; static ssize_t create_store(struct kobject *kobj, struct device *dev, const char *buf, size_t count) { char *str; uuid_le uuid; int ret; if ((count < UUID_STRING_LEN) || (count > UUID_STRING_LEN + 1)) return -EINVAL; str = kstrndup(buf, count, GFP_KERNEL); if (!str) return -ENOMEM; ret = uuid_le_to_bin(str, &uuid); kfree(str); if (ret) return ret; ret = mdev_device_create(kobj, dev, uuid); if (ret) return ret; return count; } MDEV_TYPE_ATTR_WO(create); static void mdev_type_release(struct kobject *kobj) { struct mdev_type *type = to_mdev_type(kobj); pr_debug("Releasing group %s\n", kobj->name); kfree(type); } static struct kobj_type mdev_type_ktype = { .sysfs_ops = &mdev_type_sysfs_ops, .release = mdev_type_release, }; struct mdev_type *add_mdev_supported_type(struct mdev_parent *parent, struct attribute_group *group) { struct mdev_type *type; int ret; if (!group->name) { pr_err("%s: Type name empty!\n", __func__); return ERR_PTR(-EINVAL); } type = kzalloc(sizeof(*type), GFP_KERNEL); if (!type) return ERR_PTR(-ENOMEM); type->kobj.kset = parent->mdev_types_kset; ret = kobject_init_and_add(&type->kobj, &mdev_type_ktype, NULL, "%s-%s", dev_driver_string(parent->dev), group->name); if (ret) { kfree(type); return ERR_PTR(ret); } ret = sysfs_create_file(&type->kobj, &mdev_type_attr_create.attr); if (ret) goto attr_create_failed; type->devices_kobj = kobject_create_and_add("devices", &type->kobj); if (!type->devices_kobj) { ret = -ENOMEM; goto attr_devices_failed; } ret = sysfs_create_files(&type->kobj, (const struct attribute **)group->attrs); if (ret) { ret = -ENOMEM; goto attrs_failed; } type->group = group; type->parent = parent; return type; attrs_failed: kobject_put(type->devices_kobj); attr_devices_failed: sysfs_remove_file(&type->kobj, &mdev_type_attr_create.attr); attr_create_failed: kobject_del(&type->kobj); kobject_put(&type->kobj); return ERR_PTR(ret); } static void remove_mdev_supported_type(struct mdev_type *type) { sysfs_remove_files(&type->kobj, (const struct attribute **)type->group->attrs); kobject_put(type->devices_kobj); sysfs_remove_file(&type->kobj, &mdev_type_attr_create.attr); kobject_del(&type->kobj); kobject_put(&type->kobj); } static int add_mdev_supported_type_groups(struct mdev_parent *parent) { int i; for (i = 0; parent->ops->supported_type_groups[i]; i++) { struct mdev_type *type; type = add_mdev_supported_type(parent, parent->ops->supported_type_groups[i]); if (IS_ERR(type)) { struct mdev_type *ltype, *tmp; list_for_each_entry_safe(ltype, tmp, &parent->type_list, next) { list_del(<ype->next); remove_mdev_supported_type(ltype); } return PTR_ERR(type); } list_add(&type->next, &parent->type_list); } return 0; } /* mdev sysfs functions */ void parent_remove_sysfs_files(struct mdev_parent *parent) { struct mdev_type *type, *tmp; list_for_each_entry_safe(type, tmp, &parent->type_list, next) { list_del(&type->next); remove_mdev_supported_type(type); } sysfs_remove_groups(&parent->dev->kobj, parent->ops->dev_attr_groups); kset_unregister(parent->mdev_types_kset); } int parent_create_sysfs_files(struct mdev_parent *parent) { int ret; parent->mdev_types_kset = kset_create_and_add("mdev_supported_types", NULL, &parent->dev->kobj); if (!parent->mdev_types_kset) return -ENOMEM; INIT_LIST_HEAD(&parent->type_list); ret = sysfs_create_groups(&parent->dev->kobj, parent->ops->dev_attr_groups); if (ret) goto create_err; ret = add_mdev_supported_type_groups(parent); if (ret) sysfs_remove_groups(&parent->dev->kobj, parent->ops->dev_attr_groups); else return ret; create_err: kset_unregister(parent->mdev_types_kset); return ret; } static ssize_t remove_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { unsigned long val; if (kstrtoul(buf, 0, &val) < 0) return -EINVAL; if (val && device_remove_file_self(dev, attr)) { int ret; ret = mdev_device_remove(dev, false); if (ret) { device_create_file(dev, attr); return ret; } } return count; } static DEVICE_ATTR_WO(remove); static const struct attribute *mdev_device_attrs[] = { &dev_attr_remove.attr, NULL, }; int mdev_create_sysfs_files(struct device *dev, struct mdev_type *type) { int ret; ret = sysfs_create_files(&dev->kobj, mdev_device_attrs); if (ret) return ret; ret = sysfs_create_link(type->devices_kobj, &dev->kobj, dev_name(dev)); if (ret) goto device_link_failed; ret = sysfs_create_link(&dev->kobj, &type->kobj, "mdev_type"); if (ret) goto type_link_failed; return ret; type_link_failed: sysfs_remove_link(type->devices_kobj, dev_name(dev)); device_link_failed: sysfs_remove_files(&dev->kobj, mdev_device_attrs); return ret; } void mdev_remove_sysfs_files(struct device *dev, struct mdev_type *type) { sysfs_remove_link(&dev->kobj, "mdev_type"); sysfs_remove_link(type->devices_kobj, dev_name(dev)); sysfs_remove_files(&dev->kobj, mdev_device_attrs); } e stub's libfdt implementation uses the ordinary, accelerated string functions, which rely on hardware handling of unaligned accesses, manipulating the FDT with the MMU off may result in alignment faults. So fix the situation by moving the update_fdt_memmap() call into the callback function invoked by efi_exit_boot_services() right before it calls the ExitBootServices() UEFI service (which is arguably a better place for it anyway) Note that disabling the MMU in ExitBootServices() is not compliant with the UEFI spec, and carries great risk due to the fact that switching from cached to uncached memory accesses halfway through compiler generated code (i.e., involving a stack) can never be done in a way that is architecturally safe. Fixes: abfb7b686a3e ("efi/libstub/arm*: Pass latest memory map to the kernel") Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Tested-by: Riku Voipio <riku.voipio@linaro.org> Cc: <stable@vger.kernel.org> Cc: mark.rutland@arm.com Cc: linux-efi@vger.kernel.org Cc: matt@codeblueprint.co.uk Cc: leif.lindholm@linaro.org Cc: linux-arm-kernel@lists.infradead.org Link: http://lkml.kernel.org/r/1485971102-23330-2-git-send-email-ard.biesheuvel@linaro.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'drivers/usb/core/port.c')