From 87d308708712ff6075c4dd54b0519b47fdad8816 Mon Sep 17 00:00:00 2001 From: Oleksandr Suvorov Date: Thu, 26 Mar 2020 12:44:27 +0200 Subject: Backports v5.4.27 Backports generated by toradex backports f6e8852f1ef28e6d3c9bae8400eb6a87a6b0c3e7 against mainline kernel tag v5.4.27 Signed-off-by: Oleksandr Suvorov --- compat/backport-3.10.c | 237 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 237 insertions(+) create mode 100644 compat/backport-3.10.c (limited to 'compat/backport-3.10.c') diff --git a/compat/backport-3.10.c b/compat/backport-3.10.c new file mode 100644 index 0000000..0c0e260 --- /dev/null +++ b/compat/backport-3.10.c @@ -0,0 +1,237 @@ +/* + * Copyright (c) 2013 Luis R. Rodriguez + * + * Linux backport symbols for kernels 3.10. + * + * 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 +#include +#include +#include + +void proc_set_size(struct proc_dir_entry *de, loff_t size) +{ + de->size = size; +} +EXPORT_SYMBOL_GPL(proc_set_size); + +void proc_set_user(struct proc_dir_entry *de, kuid_t uid, kgid_t gid) +{ + de->uid = uid; + de->gid = gid; +} +EXPORT_SYMBOL_GPL(proc_set_user); + +/* get_random_int() was not exported for module use until 3.10-rc. + Implement it here in terms of the more expensive get_random_bytes() + */ +unsigned int get_random_int(void) +{ + unsigned int r; + get_random_bytes(&r, sizeof(r)); + + return r; +} +EXPORT_SYMBOL_GPL(get_random_int); + +#ifdef CONFIG_TTY +/** + * tty_port_tty_wakeup - helper to wake up a tty + * + * @port: tty port + */ +void tty_port_tty_wakeup(struct tty_port *port) +{ + struct tty_struct *tty = tty_port_tty_get(port); + + if (tty) { + tty_wakeup(tty); + tty_kref_put(tty); + } +} +EXPORT_SYMBOL_GPL(tty_port_tty_wakeup); + +/** + * tty_port_tty_hangup - helper to hang up a tty + * + * @port: tty port + * @check_clocal: hang only ttys with CLOCAL unset? + */ +void tty_port_tty_hangup(struct tty_port *port, bool check_clocal) +{ + struct tty_struct *tty = tty_port_tty_get(port); + + if (tty && (!check_clocal || !C_CLOCAL(tty))) + tty_hangup(tty); + tty_kref_put(tty); +} +EXPORT_SYMBOL_GPL(tty_port_tty_hangup); +#endif /* CONFIG_TTY */ + +#ifdef CONFIG_PCI_IOV +/* + * pci_vfs_assigned - returns number of VFs are assigned to a guest + * @dev: the PCI device + * + * Returns number of VFs belonging to this device that are assigned to a guest. + * If device is not a physical function returns -ENODEV. + */ +int pci_vfs_assigned(struct pci_dev *dev) +{ + struct pci_dev *vfdev; + unsigned int vfs_assigned = 0; + unsigned short dev_id; + + /* only search if we are a PF */ + if (!dev->is_physfn) + return 0; + + /* + * determine the device ID for the VFs, the vendor ID will be the + * same as the PF so there is no need to check for that one + */ + pci_read_config_word(dev, dev->sriov->pos + PCI_SRIOV_VF_DID, &dev_id); + + /* loop through all the VFs to see if we own any that are assigned */ + vfdev = pci_get_device(dev->vendor, dev_id, NULL); + while (vfdev) { + /* + * It is considered assigned if it is a virtual function with + * our dev as the physical function and the assigned bit is set + */ + if (vfdev->is_virtfn && (vfdev->physfn == dev) && + (vfdev->dev_flags & PCI_DEV_FLAGS_ASSIGNED)) + vfs_assigned++; + + vfdev = pci_get_device(dev->vendor, dev_id, vfdev); + } + + return vfs_assigned; +} +EXPORT_SYMBOL_GPL(pci_vfs_assigned); +#endif /* CONFIG_PCI_IOV */ + +#ifdef CONFIG_OF +/** + * of_property_read_u32_index - Find and read a u32 from a multi-value property. + * + * @np: device node from which the property value is to be read. + * @propname: name of the property to be searched. + * @index: index of the u32 in the list of values + * @out_value: pointer to return value, modified only if no error. + * + * Search for a property in a device node and read nth 32-bit value from + * it. Returns 0 on success, -EINVAL if the property does not exist, + * -ENODATA if property does not have a value, and -EOVERFLOW if the + * property data isn't large enough. + * + * The out_value is modified only if a valid u32 value can be decoded. + */ +int of_property_read_u32_index(const struct device_node *np, + const char *propname, + u32 index, u32 *out_value) +{ + const u32 *val = of_find_property_value_of_size(np, propname, + ((index + 1) * sizeof(*out_value))); + + if (IS_ERR(val)) + return PTR_ERR(val); + + *out_value = be32_to_cpup(((__be32 *)val) + index); + return 0; +} +EXPORT_SYMBOL_GPL(of_property_read_u32_index); +#endif /* CONFIG_OF */ + +static inline void set_page_count(struct page *page, int v) +{ + atomic_set(&page->_count, v); +} + +/* + * Turn a non-refcounted page (->_count == 0) into refcounted with + * a count of one. + */ +static inline void set_page_refcounted(struct page *page) +{ + VM_BUG_ON(PageTail(page)); + VM_BUG_ON(atomic_read(&page->_count)); + set_page_count(page, 1); +} + +/* + * split_page takes a non-compound higher-order page, and splits it into + * n (1<action(devres->data); +} + +/** + * devm_add_action() - add a custom action to list of managed resources + * @dev: Device that owns the action + * @action: Function that should be called + * @data: Pointer to data passed to @action implementation + * + * This adds a custom action to the list of managed resources so that + * it gets executed as part of standard resource unwinding. + */ +int devm_add_action(struct device *dev, void (*action)(void *), void *data) +{ + struct action_devres *devres; + + devres = devres_alloc(devm_action_release, + sizeof(struct action_devres), GFP_KERNEL); + if (!devres) + return -ENOMEM; + + devres->data = data; + devres->action = action; + + devres_add(dev, devres); + return 0; +} +EXPORT_SYMBOL_GPL(devm_add_action); -- cgit v1.2.3