driver core: synchronize device shutdown

[safe/jmp/linux-2.6] / drivers / base / memory.c

diff --git a/drivers/base/memory.c b/drivers/base/memory.c
index 4d4e0e7..989429c 100644 (file)
--- a/drivers/base/memory.c
+++ b/drivers/base/memory.c
@@ -21,6 +21,8 @@
 #include <linux/memory_hotplug.h>
 #include <linux/mm.h>
 #include <linux/mutex.h>
+#include <linux/stat.h>
+
 #include <asm/atomic.h>
 #include <asm/uaccess.h>
 
@@ -101,6 +103,22 @@ static ssize_t show_mem_phys_index(struct sys_device *dev,
 }
 
 /*
+ * Show whether the section of memory is likely to be hot-removable
+ */
+static ssize_t show_mem_removable(struct sys_device *dev,
+                       struct sysdev_attribute *attr, char *buf)
+{
+       unsigned long start_pfn;
+       int ret;
+       struct memory_block *mem =
+               container_of(dev, struct memory_block, sysdev);
+
+       start_pfn = section_nr_to_pfn(mem->phys_index);
+       ret = is_mem_section_removable(start_pfn, PAGES_PER_SECTION);
+       return sprintf(buf, "%d\n", ret);
+}
+
+/*
  * online, offline, going offline, etc.
  */
 static ssize_t show_mem_state(struct sys_device *dev,
@@ -189,9 +207,8 @@ memory_block_action(struct memory_block *mem, unsigned long action)
                        }
                        break;
                default:
-                       printk(KERN_WARNING "%s(%p, %ld) unknown action: %ld\n",
+                       WARN(1, KERN_WARNING "%s(%p, %ld) unknown action: %ld\n",
                                        __func__, mem, action, action);
-                       WARN_ON(1);
                        ret = -EINVAL;
        }
 
@@ -262,6 +279,7 @@ static ssize_t show_phys_device(struct sys_device *dev,
 static SYSDEV_ATTR(phys_index, 0444, show_mem_phys_index, NULL);
 static SYSDEV_ATTR(state, 0644, show_mem_state, store_mem_state);
 static SYSDEV_ATTR(phys_device, 0444, show_phys_device, NULL);
+static SYSDEV_ATTR(removable, 0444, show_mem_removable, NULL);
 
 #define mem_create_simple_file(mem, attr_name) \
        sysdev_create_file(&mem->sysdev, &attr_##attr_name)
@@ -309,7 +327,7 @@ memory_probe_store(struct class *class, const char *buf, size_t count)
 
        return count;
 }
-static CLASS_ATTR(probe, 0700, NULL, memory_probe_store);
+static CLASS_ATTR(probe, S_IWUSR, NULL, memory_probe_store);
 
 static int memory_probe_init(void)
 {
@@ -329,8 +347,9 @@ static inline int memory_probe_init(void)
  * section belongs to...
  */
 
-static int add_memory_block(unsigned long node_id, struct mem_section *section,
-                    unsigned long state, int phys_device)
+static int add_memory_block(int nid, struct mem_section *section,
+                       unsigned long state, int phys_device,
+                       enum mem_add_context context)
 {
        struct memory_block *mem = kzalloc(sizeof(*mem), GFP_KERNEL);
        int ret = 0;
@@ -350,6 +369,12 @@ static int add_memory_block(unsigned long node_id, struct mem_section *section,
                ret = mem_create_simple_file(mem, state);
        if (!ret)
                ret = mem_create_simple_file(mem, phys_device);
+       if (!ret)
+               ret = mem_create_simple_file(mem, removable);
+       if (!ret) {
+               if (context == HOTPLUG)
+                       ret = register_mem_sect_under_node(mem, nid);
+       }
 
        return ret;
 }
@@ -362,7 +387,7 @@ static int add_memory_block(unsigned long node_id, struct mem_section *section,
  *
  * This could be made generic for all sysdev classes.
  */
-static struct memory_block *find_memory_block(struct mem_section *section)
+struct memory_block *find_memory_block(struct mem_section *section)
 {
        struct kobject *kobj;
        struct sys_device *sysdev;
@@ -391,9 +416,11 @@ int remove_memory_block(unsigned long node_id, struct mem_section *section,
        struct memory_block *mem;
 
        mem = find_memory_block(section);
+       unregister_mem_sect_under_nodes(mem);
        mem_remove_simple_file(mem, phys_index);
        mem_remove_simple_file(mem, state);
        mem_remove_simple_file(mem, phys_device);
+       mem_remove_simple_file(mem, removable);
        unregister_memory(mem, section);
 
        return 0;
@@ -403,9 +430,9 @@ int remove_memory_block(unsigned long node_id, struct mem_section *section,
  * need an interface for the VM to add new memory regions,
  * but without onlining it.
  */
-int register_new_memory(struct mem_section *section)
+int register_new_memory(int nid, struct mem_section *section)
 {
-       return add_memory_block(0, section, MEM_OFFLINE, 0);
+       return add_memory_block(nid, section, MEM_OFFLINE, 0, HOTPLUG);
 }
 
 int unregister_memory_section(struct mem_section *section)
@@ -437,7 +464,8 @@ int __init memory_dev_init(void)
        for (i = 0; i < NR_MEM_SECTIONS; i++) {
                if (!present_section_nr(i))
                        continue;
-               err = add_memory_block(0, __nr_to_section(i), MEM_ONLINE, 0);
+               err = add_memory_block(0, __nr_to_section(i), MEM_ONLINE,
+                                       0, BOOT);
                if (!ret)
                        ret = err;
        }