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-rw-r--r--drivers/xen/balloon.c229
1 files changed, 6 insertions, 223 deletions
diff --git a/drivers/xen/balloon.c b/drivers/xen/balloon.c
index 77e6ad38c0b9..7497041d0631 100644
--- a/drivers/xen/balloon.c
+++ b/drivers/xen/balloon.c
@@ -1,6 +1,4 @@
/******************************************************************************
- * balloon.c
- *
* Xen balloon driver - enables returning/claiming memory to/from Xen.
*
* Copyright (c) 2003, B Dragovic
@@ -33,7 +31,6 @@
*/
#include <linux/kernel.h>
-#include <linux/module.h>
#include <linux/sched.h>
#include <linux/errno.h>
#include <linux/mm.h>
@@ -42,13 +39,11 @@
#include <linux/highmem.h>
#include <linux/mutex.h>
#include <linux/list.h>
-#include <linux/sysdev.h>
#include <linux/gfp.h>
#include <asm/page.h>
#include <asm/pgalloc.h>
#include <asm/pgtable.h>
-#include <asm/uaccess.h>
#include <asm/tlb.h>
#include <asm/e820.h>
@@ -58,14 +53,10 @@
#include <xen/xen.h>
#include <xen/interface/xen.h>
#include <xen/interface/memory.h>
-#include <xen/xenbus.h>
+#include <xen/balloon.h>
#include <xen/features.h>
#include <xen/page.h>
-#define PAGES2KB(_p) ((_p)<<(PAGE_SHIFT-10))
-
-#define BALLOON_CLASS_NAME "xen_memory"
-
/*
* balloon_process() state:
*
@@ -80,28 +71,11 @@ enum bp_state {
BP_ECANCELED
};
-#define RETRY_UNLIMITED 0
-
-struct balloon_stats {
- /* We aim for 'current allocation' == 'target allocation'. */
- unsigned long current_pages;
- unsigned long target_pages;
- /* Number of pages in high- and low-memory balloons. */
- unsigned long balloon_low;
- unsigned long balloon_high;
- unsigned long schedule_delay;
- unsigned long max_schedule_delay;
- unsigned long retry_count;
- unsigned long max_retry_count;
-};
static DEFINE_MUTEX(balloon_mutex);
-static struct sys_device balloon_sysdev;
-
-static int register_balloon(struct sys_device *sysdev);
-
-static struct balloon_stats balloon_stats;
+struct balloon_stats balloon_stats;
+EXPORT_SYMBOL_GPL(balloon_stats);
/* We increase/decrease in batches which fit in a page */
static unsigned long frame_list[PAGE_SIZE / sizeof(unsigned long)];
@@ -384,51 +358,13 @@ static void balloon_process(struct work_struct *work)
}
/* Resets the Xen limit, sets new target, and kicks off processing. */
-static void balloon_set_new_target(unsigned long target)
+void balloon_set_new_target(unsigned long target)
{
/* No need for lock. Not read-modify-write updates. */
balloon_stats.target_pages = target;
schedule_delayed_work(&balloon_worker, 0);
}
-
-static struct xenbus_watch target_watch =
-{
- .node = "memory/target"
-};
-
-/* 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));
-}
-
-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\n");
-
- return NOTIFY_DONE;
-}
-
-static struct notifier_block xenstore_notifier;
+EXPORT_SYMBOL_GPL(balloon_set_new_target);
static int __init balloon_init(void)
{
@@ -438,7 +374,7 @@ static int __init balloon_init(void)
if (!xen_pv_domain())
return -ENODEV;
- pr_info("xen_balloon: Initialising balloon driver.\n");
+ pr_info("xen/balloon: Initialising balloon driver.\n");
balloon_stats.current_pages = min(xen_start_info->nr_pages, max_pfn);
balloon_stats.target_pages = balloon_stats.current_pages;
@@ -450,8 +386,6 @@ static int __init balloon_init(void)
balloon_stats.retry_count = 1;
balloon_stats.max_retry_count = RETRY_UNLIMITED;
- register_balloon(&balloon_sysdev);
-
/*
* Initialise the balloon with excess memory space. We need
* to make sure we don't add memory which doesn't exist or
@@ -472,160 +406,9 @@ static int __init balloon_init(void)
__balloon_append(page);
}
- target_watch.callback = watch_target;
- xenstore_notifier.notifier_call = balloon_init_watcher;
-
- 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...) \
- static ssize_t show_##name(struct sys_device *dev, \
- struct sysdev_attribute *attr, \
- char *buf) \
- { \
- return sprintf(buf, format, ##args); \
- } \
- static SYSDEV_ATTR(name, S_IRUGO, show_##name, NULL)
-
-BALLOON_SHOW(current_kb, "%lu\n", PAGES2KB(balloon_stats.current_pages));
-BALLOON_SHOW(low_kb, "%lu\n", PAGES2KB(balloon_stats.balloon_low));
-BALLOON_SHOW(high_kb, "%lu\n", PAGES2KB(balloon_stats.balloon_high));
-
-static SYSDEV_ULONG_ATTR(schedule_delay, 0444, balloon_stats.schedule_delay);
-static SYSDEV_ULONG_ATTR(max_schedule_delay, 0644, balloon_stats.max_schedule_delay);
-static SYSDEV_ULONG_ATTR(retry_count, 0444, balloon_stats.retry_count);
-static SYSDEV_ULONG_ATTR(max_retry_count, 0644, balloon_stats.max_retry_count);
-
-static ssize_t show_target_kb(struct sys_device *dev, struct sysdev_attribute *attr,
- char *buf)
-{
- return sprintf(buf, "%lu\n", PAGES2KB(balloon_stats.target_pages));
-}
-
-static ssize_t store_target_kb(struct sys_device *dev,
- struct sysdev_attribute *attr,
- 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;
-}
-
-static SYSDEV_ATTR(target_kb, S_IRUGO | S_IWUSR,
- show_target_kb, store_target_kb);
-
-
-static ssize_t show_target(struct sys_device *dev, struct sysdev_attribute *attr,
- char *buf)
-{
- return sprintf(buf, "%llu\n",
- (unsigned long long)balloon_stats.target_pages
- << PAGE_SHIFT);
-}
-
-static ssize_t store_target(struct sys_device *dev,
- struct sysdev_attribute *attr,
- 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;
-}
-
-static SYSDEV_ATTR(target, S_IRUGO | S_IWUSR,
- show_target, store_target);
-
-
-static struct sysdev_attribute *balloon_attrs[] = {
- &attr_target_kb,
- &attr_target,
- &attr_schedule_delay.attr,
- &attr_max_schedule_delay.attr,
- &attr_retry_count.attr,
- &attr_max_retry_count.attr
-};
-
-static struct attribute *balloon_info_attrs[] = {
- &attr_current_kb.attr,
- &attr_low_kb.attr,
- &attr_high_kb.attr,
- NULL
-};
-
-static struct attribute_group balloon_info_group = {
- .name = "info",
- .attrs = balloon_info_attrs,
-};
-
-static struct sysdev_class balloon_sysdev_class = {
- .name = BALLOON_CLASS_NAME,
-};
-
-static int register_balloon(struct sys_device *sysdev)
-{
- int i, error;
-
- error = sysdev_class_register(&balloon_sysdev_class);
- if (error)
- return error;
-
- sysdev->id = 0;
- sysdev->cls = &balloon_sysdev_class;
-
- error = sysdev_register(sysdev);
- if (error) {
- sysdev_class_unregister(&balloon_sysdev_class);
- return error;
- }
-
- for (i = 0; i < ARRAY_SIZE(balloon_attrs); i++) {
- error = sysdev_create_file(sysdev, balloon_attrs[i]);
- if (error)
- goto fail;
- }
-
- error = sysfs_create_group(&sysdev->kobj, &balloon_info_group);
- if (error)
- goto fail;
-
- return 0;
-
- fail:
- while (--i >= 0)
- sysdev_remove_file(sysdev, balloon_attrs[i]);
- sysdev_unregister(sysdev);
- sysdev_class_unregister(&balloon_sysdev_class);
- return error;
-}
-
MODULE_LICENSE("GPL");
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-16 11:27:11 +0100