From 119e9db233ad0f4cbd4cfb9f9385a7bca378b37d Mon Sep 17 00:00:00 2001 From: Zeng Chi Date: Mon, 21 Sep 2026 18:24:42 +0800 Subject: KVM: Don't pre-reserve xarray entries when storing empty/NULL attributes Skip the xarray reservation loop when clearing all memory attributes, as storing NULL only erases the entry and never needs to allocate, so no reservation (and no cleanup of a failed one) is required in that case. Suggested-by: Sean Christopherson Cc: David Ballesteros Signed-off-by: Zeng Chi Link: https://patch.msgid.link/20260921102442.1232375-1-zeng_chi911@163.com [sean: split to separate patch] Signed-off-by: Sean Christopherson --- drivers/macintosh/mac_hid.c | 262 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 262 insertions(+) create mode 100644 drivers/macintosh/mac_hid.c (limited to 'drivers/macintosh/mac_hid.c') diff --git a/drivers/macintosh/mac_hid.c b/drivers/macintosh/mac_hid.c new file mode 100644 index 000000000..1fdf3855f --- /dev/null +++ b/drivers/macintosh/mac_hid.c @@ -0,0 +1,262 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * drivers/macintosh/mac_hid.c + * + * HID support stuff for Macintosh computers. + * + * Copyright (C) 2000 Franz Sirl. + * + * This file will soon be removed in favor of an uinput userspace tool. + */ + +#include +#include +#include +#include +#include +#include + +MODULE_DESCRIPTION("Mouse button 2+3 emulation"); +MODULE_LICENSE("GPL"); + +static int mouse_emulate_buttons; +static int mouse_button2_keycode = KEY_RIGHTCTRL; /* right control key */ +static int mouse_button3_keycode = KEY_RIGHTALT; /* right option key */ + +static struct input_dev *mac_hid_emumouse_dev; + +static DEFINE_MUTEX(mac_hid_emumouse_mutex); + +static int mac_hid_create_emumouse(void) +{ + static struct lock_class_key mac_hid_emumouse_dev_event_class; + static struct lock_class_key mac_hid_emumouse_dev_mutex_class; + int err; + + mac_hid_emumouse_dev = input_allocate_device(); + if (!mac_hid_emumouse_dev) + return -ENOMEM; + + lockdep_set_class(&mac_hid_emumouse_dev->event_lock, + &mac_hid_emumouse_dev_event_class); + lockdep_set_class(&mac_hid_emumouse_dev->mutex, + &mac_hid_emumouse_dev_mutex_class); + + mac_hid_emumouse_dev->name = "Macintosh mouse button emulation"; + mac_hid_emumouse_dev->id.bustype = BUS_ADB; + mac_hid_emumouse_dev->id.vendor = 0x0001; + mac_hid_emumouse_dev->id.product = 0x0001; + mac_hid_emumouse_dev->id.version = 0x0100; + + mac_hid_emumouse_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REL); + mac_hid_emumouse_dev->keybit[BIT_WORD(BTN_MOUSE)] = + BIT_MASK(BTN_LEFT) | BIT_MASK(BTN_MIDDLE) | BIT_MASK(BTN_RIGHT); + mac_hid_emumouse_dev->relbit[0] = BIT_MASK(REL_X) | BIT_MASK(REL_Y); + + err = input_register_device(mac_hid_emumouse_dev); + if (err) { + input_free_device(mac_hid_emumouse_dev); + mac_hid_emumouse_dev = NULL; + return err; + } + + return 0; +} + +static void mac_hid_destroy_emumouse(void) +{ + input_unregister_device(mac_hid_emumouse_dev); + mac_hid_emumouse_dev = NULL; +} + +static bool mac_hid_emumouse_filter(struct input_handle *handle, + unsigned int type, unsigned int code, + int value) +{ + unsigned int btn; + + if (type != EV_KEY) + return false; + + if (code == mouse_button2_keycode) + btn = BTN_MIDDLE; + else if (code == mouse_button3_keycode) + btn = BTN_RIGHT; + else + return false; + + input_report_key(mac_hid_emumouse_dev, btn, value); + input_sync(mac_hid_emumouse_dev); + + return true; +} + +static int mac_hid_emumouse_connect(struct input_handler *handler, + struct input_dev *dev, + const struct input_device_id *id) +{ + struct input_handle *handle; + int error; + + /* Don't bind to ourselves */ + if (dev == mac_hid_emumouse_dev) + return -ENODEV; + + handle = kzalloc_obj(struct input_handle); + if (!handle) + return -ENOMEM; + + handle->dev = dev; + handle->handler = handler; + handle->name = "mac-button-emul"; + + error = input_register_handle(handle); + if (error) { + printk(KERN_ERR + "mac_hid: Failed to register button emulation handle, " + "error %d\n", error); + goto err_free; + } + + error = input_open_device(handle); + if (error) { + printk(KERN_ERR + "mac_hid: Failed to open input device, error %d\n", + error); + goto err_unregister; + } + + return 0; + + err_unregister: + input_unregister_handle(handle); + err_free: + kfree(handle); + return error; +} + +static void mac_hid_emumouse_disconnect(struct input_handle *handle) +{ + input_close_device(handle); + input_unregister_handle(handle); + kfree(handle); +} + +static const struct input_device_id mac_hid_emumouse_ids[] = { + { + .flags = INPUT_DEVICE_ID_MATCH_EVBIT, + .evbit = { BIT_MASK(EV_KEY) }, + }, + { }, +}; + +MODULE_DEVICE_TABLE(input, mac_hid_emumouse_ids); + +static struct input_handler mac_hid_emumouse_handler = { + .filter = mac_hid_emumouse_filter, + .connect = mac_hid_emumouse_connect, + .disconnect = mac_hid_emumouse_disconnect, + .name = "mac-button-emul", + .id_table = mac_hid_emumouse_ids, +}; + +static int mac_hid_start_emulation(void) +{ + int err; + + err = mac_hid_create_emumouse(); + if (err) + return err; + + err = input_register_handler(&mac_hid_emumouse_handler); + if (err) { + mac_hid_destroy_emumouse(); + return err; + } + + return 0; +} + +static void mac_hid_stop_emulation(void) +{ + input_unregister_handler(&mac_hid_emumouse_handler); + mac_hid_destroy_emumouse(); +} + +static int mac_hid_toggle_emumouse(const struct ctl_table *table, int write, + void *buffer, size_t *lenp, loff_t *ppos) +{ + int *valp = table->data; + int old_val; + int rc; + + rc = mutex_lock_killable(&mac_hid_emumouse_mutex); + if (rc) + return rc; + + old_val = *valp; + rc = proc_dointvec(table, write, buffer, lenp, ppos); + + if (rc == 0 && write && *valp != old_val) { + if (*valp == 1) + rc = mac_hid_start_emulation(); + else if (*valp == 0) + mac_hid_stop_emulation(); + else + rc = -EINVAL; + } + + /* Restore the old value in case of error */ + if (rc) + *valp = old_val; + + mutex_unlock(&mac_hid_emumouse_mutex); + + return rc; +} + +/* file(s) in /proc/sys/dev/mac_hid */ +static const struct ctl_table mac_hid_files[] = { + { + .procname = "mouse_button_emulation", + .data = &mouse_emulate_buttons, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = mac_hid_toggle_emumouse, + }, + { + .procname = "mouse_button2_keycode", + .data = &mouse_button2_keycode, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = proc_dointvec, + }, + { + .procname = "mouse_button3_keycode", + .data = &mouse_button3_keycode, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = proc_dointvec, + }, +}; + +static struct ctl_table_header *mac_hid_sysctl_header; + +static int __init mac_hid_init(void) +{ + mac_hid_sysctl_header = register_sysctl("dev/mac_hid", mac_hid_files); + if (!mac_hid_sysctl_header) + return -ENOMEM; + + return 0; +} +module_init(mac_hid_init); + +static void __exit mac_hid_exit(void) +{ + unregister_sysctl_table(mac_hid_sysctl_header); + + if (mouse_emulate_buttons) + mac_hid_stop_emulation(); +} +module_exit(mac_hid_exit); -- cgit v1.3.1