#include <linux/sysdev.h>
#include <linux/node.h>
#include <linux/compiler.h>
-
-#include <asm/semaphore.h>
+#include <linux/mutex.h>
struct memory_block {
unsigned long phys_index;
* created long after the critical areas during
* initialization.
*/
- struct semaphore state_sem;
+ struct mutex state_mutex;
int phys_device; /* to which fru does this belong? */
void *hw; /* optional pointer to fw/hw data */
int (*phys_callback)(struct memory_block *);
#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 */
+#define MEM_GOING_ONLINE (1<<3)
+#define MEM_CANCEL_ONLINE (1<<4)
+#define MEM_CANCEL_OFFLINE (1<<5)
-/*
- * 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 memory_notify {
+ unsigned long start_pfn;
+ unsigned long nr_pages;
+ int status_change_nid;
+};
struct notifier_block;
struct mem_section;
-#ifndef CONFIG_MEMORY_HOTPLUG
+/*
+ * Priorities for the hotplug memory callback routines (stored in decreasing
+ * order in the callback chain)
+ */
+#define SLAB_CALLBACK_PRI 1
+#define IPC_CALLBACK_PRI 10
+
+#ifndef CONFIG_MEMORY_HOTPLUG_SPARSE
static inline int memory_dev_init(void)
{
return 0;
static inline void unregister_memory_notifier(struct notifier_block *nb)
{
}
+static inline int memory_notify(unsigned long val, void *v)
+{
+ return 0;
+}
#else
-extern int register_new_memory(struct mem_section *);
+extern int register_memory_notifier(struct notifier_block *nb);
+extern void unregister_memory_notifier(struct notifier_block *nb);
+extern int register_new_memory(int, 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);
-
+extern int memory_notify(unsigned long val, void *v);
+extern struct memory_block *find_memory_block(struct mem_section *);
#define CONFIG_MEM_BLOCK_SIZE (PAGES_PER_SECTION<<PAGE_SHIFT)
+enum mem_add_context { BOOT, HOTPLUG };
+#endif /* CONFIG_MEMORY_HOTPLUG_SPARSE */
-struct notifier_block;
-
-#endif /* CONFIG_MEMORY_HOTPLUG */
-
+#ifdef CONFIG_MEMORY_HOTPLUG
#define hotplug_memory_notifier(fn, pri) { \
- static struct notifier_block fn##_mem_nb = \
+ static __meminitdata struct notifier_block fn##_mem_nb =\
{ .notifier_call = fn, .priority = pri }; \
register_memory_notifier(&fn##_mem_nb); \
}
+#else
+#define hotplug_memory_notifier(fn, pri) do { } while (0)
+#endif
+
+/*
+ * 'struct memory_accessor' is a generic interface to provide
+ * in-kernel access to persistent memory such as i2c or SPI EEPROMs
+ */
+struct memory_accessor {
+ ssize_t (*read)(struct memory_accessor *, char *buf, off_t offset,
+ size_t count);
+ ssize_t (*write)(struct memory_accessor *, const char *buf,
+ off_t offset, size_t count);
+};
+
+/*
+ * Kernel text modification mutex, used for code patching. Users of this lock
+ * can sleep.
+ */
+extern struct mutex text_mutex;
#endif /* _LINUX_MEMORY_H_ */