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drivers/xen/xen-balloon.c
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/****************************************************************************** * Xen balloon driver - enables returning/claiming memory to/from Xen. * * Copyright (c) 2003, B Dragovic * Copyright (c) 2003-2004, M Williamson, K Fraser * Copyright (c) 2005 Dan M. Smith, IBM Corporation * * 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; or, when distributed * separately from the Linux kernel or incorporated into other * software packages, subject to the following license: * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this source file (the "Software"), to deal in the Software without * restriction, including without limitation the rights to use, copy, modify, * merge, publish, distribute, sublicense, and/or sell copies of the Software, * and to permit persons to whom the Software is furnished to do so, subject to * the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS * IN THE SOFTWARE. */ #include <linux/kernel.h> #include <linux/module.h> |
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#include <linux/capability.h> #include <xen/xen.h> #include <xen/interface/xen.h> #include <xen/balloon.h> #include <xen/xenbus.h> #include <xen/features.h> #include <xen/page.h> #define PAGES2KB(_p) ((_p)<<(PAGE_SHIFT-10)) #define BALLOON_CLASS_NAME "xen_memory" |
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static struct device balloon_dev; |
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static int register_balloon(struct device *dev); |
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/* React to a change in the target key */ static void watch_target(struct xenbus_watch *watch, const char **vec, unsigned int len) { unsigned long long new_target; int err; err = xenbus_scanf(XBT_NIL, "memory", "target", "%llu", &new_target); if (err != 1) { /* This is ok (for domain0 at least) - so just return */ return; } /* The given memory/target value is in KiB, so it needs converting to * pages. PAGE_SHIFT converts bytes to pages, hence PAGE_SHIFT - 10. */ balloon_set_new_target(new_target >> (PAGE_SHIFT - 10)); } |
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static struct xenbus_watch target_watch = { .node = "memory/target", .callback = watch_target, }; |
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static int balloon_init_watcher(struct notifier_block *notifier, unsigned long event, void *data) { int err; err = register_xenbus_watch(&target_watch); if (err) printk(KERN_ERR "Failed to set balloon watcher "); return NOTIFY_DONE; } |
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static struct notifier_block xenstore_notifier = { .notifier_call = balloon_init_watcher, }; |
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static int __init balloon_init(void) { if (!xen_domain()) return -ENODEV; pr_info("xen-balloon: Initialising balloon driver. "); |
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register_balloon(&balloon_dev); |
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register_xen_selfballooning(&balloon_dev); |
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register_xenstore_notifier(&xenstore_notifier); return 0; } subsys_initcall(balloon_init); static void balloon_exit(void) { /* XXX - release balloon here */ return; } module_exit(balloon_exit); #define BALLOON_SHOW(name, format, args...) \ |
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static ssize_t show_##name(struct device *dev, \ struct device_attribute *attr, \ |
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char *buf) \ { \ return sprintf(buf, format, ##args); \ } \ |
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static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL) |
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BALLOON_SHOW(current_kb, "%lu ", PAGES2KB(balloon_stats.current_pages)); BALLOON_SHOW(low_kb, "%lu ", PAGES2KB(balloon_stats.balloon_low)); BALLOON_SHOW(high_kb, "%lu ", PAGES2KB(balloon_stats.balloon_high)); |
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static DEVICE_ULONG_ATTR(schedule_delay, 0444, balloon_stats.schedule_delay); static DEVICE_ULONG_ATTR(max_schedule_delay, 0644, balloon_stats.max_schedule_delay); static DEVICE_ULONG_ATTR(retry_count, 0444, balloon_stats.retry_count); static DEVICE_ULONG_ATTR(max_retry_count, 0644, balloon_stats.max_retry_count); |
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static ssize_t show_target_kb(struct device *dev, struct device_attribute *attr, |
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char *buf) { return sprintf(buf, "%lu ", PAGES2KB(balloon_stats.target_pages)); } |
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static ssize_t store_target_kb(struct device *dev, struct device_attribute *attr, |
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const char *buf, size_t count) { char *endchar; unsigned long long target_bytes; if (!capable(CAP_SYS_ADMIN)) return -EPERM; target_bytes = simple_strtoull(buf, &endchar, 0) * 1024; balloon_set_new_target(target_bytes >> PAGE_SHIFT); return count; } |
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static DEVICE_ATTR(target_kb, S_IRUGO | S_IWUSR, |
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show_target_kb, store_target_kb); |
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static ssize_t show_target(struct device *dev, struct device_attribute *attr, |
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char *buf) { return sprintf(buf, "%llu ", (unsigned long long)balloon_stats.target_pages << PAGE_SHIFT); } |
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static ssize_t store_target(struct device *dev, struct device_attribute *attr, |
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const char *buf, size_t count) { char *endchar; unsigned long long target_bytes; if (!capable(CAP_SYS_ADMIN)) return -EPERM; target_bytes = memparse(buf, &endchar); balloon_set_new_target(target_bytes >> PAGE_SHIFT); return count; } |
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static DEVICE_ATTR(target, S_IRUGO | S_IWUSR, |
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show_target, store_target); |
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static struct device_attribute *balloon_attrs[] = { &dev_attr_target_kb, &dev_attr_target, &dev_attr_schedule_delay.attr, &dev_attr_max_schedule_delay.attr, &dev_attr_retry_count.attr, &dev_attr_max_retry_count.attr |
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}; static struct attribute *balloon_info_attrs[] = { |
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&dev_attr_current_kb.attr, &dev_attr_low_kb.attr, &dev_attr_high_kb.attr, |
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NULL }; static struct attribute_group balloon_info_group = { .name = "info", .attrs = balloon_info_attrs }; |
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static struct bus_type balloon_subsys = { .name = BALLOON_CLASS_NAME, .dev_name = BALLOON_CLASS_NAME, |
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}; |
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static int register_balloon(struct device *dev) |
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{ int i, error; |
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error = bus_register(&balloon_subsys); |
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if (error) return error; |
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dev->id = 0; dev->bus = &balloon_subsys; |
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error = device_register(dev); |
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if (error) { |
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bus_unregister(&balloon_subsys); |
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return error; } for (i = 0; i < ARRAY_SIZE(balloon_attrs); i++) { |
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error = device_create_file(dev, balloon_attrs[i]); |
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if (error) goto fail; } |
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error = sysfs_create_group(&dev->kobj, &balloon_info_group); |
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if (error) goto fail; return 0; fail: while (--i >= 0) |
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device_remove_file(dev, balloon_attrs[i]); device_unregister(dev); bus_unregister(&balloon_subsys); |
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return error; } MODULE_LICENSE("GPL"); |