This commit was manufactured by cvs2svn to create branch 'vserver'.

[linux-2.6.git] / include / linux / memory.h

diff --git a/include/linux/memory.h b/include/linux/memory.h
new file mode 100644 (file)
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--- /dev/null
+++ b/include/linux/memory.h
@@ -0,0 +1,89 @@
+/*
+ * include/linux/memory.h - generic memory definition
+ *
+ * This is mainly for topological representation. We define the
+ * basic "struct memory_block" here, which can be embedded in per-arch
+ * definitions or NUMA information.
+ *
+ * Basic handling of the devices is done in drivers/base/memory.c
+ * and system devices are handled in drivers/base/sys.c.
+ *
+ * Memory block are exported via sysfs in the class/memory/devices/
+ * directory.
+ *
+ */
+#ifndef _LINUX_MEMORY_H_
+#define _LINUX_MEMORY_H_
+
+#include <linux/sysdev.h>
+#include <linux/node.h>
+#include <linux/compiler.h>
+
+#include <asm/semaphore.h>
+
+struct memory_block {
+       unsigned long phys_index;
+       unsigned long state;
+       /*
+        * This serializes all state change requests.  It isn't
+        * held during creation because the control files are
+        * created long after the critical areas during
+        * initialization.
+        */
+       struct semaphore state_sem;
+       int phys_device;                /* to which fru does this belong? */
+       void *hw;                       /* optional pointer to fw/hw data */
+       int (*phys_callback)(struct memory_block *);
+       struct sys_device sysdev;
+};
+
+/* These states are exposed to userspace as text strings in sysfs */
+#define        MEM_ONLINE              (1<<0) /* exposed to userspace */
+#define        MEM_GOING_OFFLINE       (1<<1) /* exposed to userspace */
+#define        MEM_OFFLINE             (1<<2) /* exposed to userspace */
+
+/*
+ * All of these states are currently kernel-internal for notifying
+ * kernel components and architectures.
+ *
+ * For MEM_MAPPING_INVALID, all notifier chains with priority >0
+ * are called before pfn_to_page() becomes invalid.  The priority=0
+ * entry is reserved for the function that actually makes
+ * pfn_to_page() stop working.  Any notifiers that want to be called
+ * after that should have priority <0.
+ */
+#define        MEM_MAPPING_INVALID     (1<<3)
+
+struct notifier_block;
+struct mem_section;
+
+#ifndef CONFIG_MEMORY_HOTPLUG
+static inline int memory_dev_init(void)
+{
+       return 0;
+}
+static inline int register_memory_notifier(struct notifier_block *nb)
+{
+       return 0;
+}
+static inline void unregister_memory_notifier(struct notifier_block *nb)
+{
+}
+#else
+extern int register_new_memory(struct mem_section *);
+extern int unregister_memory_section(struct mem_section *);
+extern int memory_dev_init(void);
+extern int remove_memory_block(unsigned long, struct mem_section *, int);
+
+#define CONFIG_MEM_BLOCK_SIZE  (PAGES_PER_SECTION<<PAGE_SHIFT)
+
+
+#endif /* CONFIG_MEMORY_HOTPLUG */
+
+#define hotplug_memory_notifier(fn, pri) {                     \
+       static struct notifier_block fn##_mem_nb =              \
+               { .notifier_call = fn, .priority = pri };       \
+       register_memory_notifier(&fn##_mem_nb);                 \
+}
+
+#endif /* _LINUX_MEMORY_H_ */