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Merge tag 'driver-core-3.12-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core

Browse Source 
Pull driver core patches from Greg KH:
 "Here's the big driver core pull request for 3.12-rc1.

  Lots of tiny changes here fixing up the way sysfs attributes are
  created, to try to make drivers simpler, and fix a whole class race
  conditions with creations of device attributes after the device was
  announced to userspace.

  All the various pieces are acked by the different subsystem
  maintainers"

* tag 'driver-core-3.12-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core: (119 commits)
  firmware loader: fix pending_fw_head list corruption
  drivers/base/memory.c: introduce help macro to_memory_block
  dynamic debug: line queries failing due to uninitialized local variable
  sysfs: sysfs_create_groups returns a value.
  debugfs: provide debugfs_create_x64() when disabled
  rbd: convert bus code to use bus_groups
  firmware: dcdbas: use binary attribute groups
  sysfs: add sysfs_create/remove_groups for when SYSFS is not enabled
  driver core: add #include <linux/sysfs.h> to core files.
  HID: convert bus code to use dev_groups
  Input: serio: convert bus code to use drv_groups
  Input: gameport: convert bus code to use drv_groups
  driver core: firmware: use __ATTR_RW()
  driver core: core: use DEVICE_ATTR_RO
  driver core: bus: use DRIVER_ATTR_WO()
  driver core: create write-only attribute macros for devices and drivers
  sysfs: create __ATTR_WO()
  driver-core: platform: convert bus code to use dev_groups
  workqueue: convert bus code to use dev_groups
  MEI: convert bus code to use dev_groups
  ...
This commit is contained in:
Linus Torvalds
2013-09-03 11:37:15 -07:00
parent 1d1fdd95df 1eeeef153c
commit 542a086ac7
99 changed files with 1950 additions and 1907 deletions
Download Patch File Download Diff File Expand all files Collapse all files

258
drivers/base/memory.c
View File

@@ -16,7 +16,6 @@
#include <linux/capability.h>
#include <linux/device.h>
#include <linux/memory.h>
#include <linux/kobject.h>
#include <linux/memory_hotplug.h>
#include <linux/mm.h>
#include <linux/mutex.h>
@@ -30,6 +29,8 @@ static DEFINE_MUTEX(mem_sysfs_mutex);
#define MEMORY_CLASS_NAME "memory"
#define to_memory_block(dev) container_of(dev, struct memory_block, dev)
static int sections_per_block;
static inline int base_memory_block_id(int section_nr)
@@ -77,7 +78,7 @@ EXPORT_SYMBOL(unregister_memory_isolate_notifier);
static void memory_block_release(struct device *dev)
{
struct memory_block *mem = container_of(dev, struct memory_block, dev);
struct memory_block *mem = to_memory_block(dev);
kfree(mem);
}
@@ -110,8 +111,7 @@ static unsigned long get_memory_block_size(void)
static ssize_t show_mem_start_phys_index(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct memory_block *mem =
container_of(dev, struct memory_block, dev);
struct memory_block *mem = to_memory_block(dev);
unsigned long phys_index;
phys_index = mem->start_section_nr / sections_per_block;
@@ -121,8 +121,7 @@ static ssize_t show_mem_start_phys_index(struct device *dev,
static ssize_t show_mem_end_phys_index(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct memory_block *mem =
container_of(dev, struct memory_block, dev);
struct memory_block *mem = to_memory_block(dev);
unsigned long phys_index;
phys_index = mem->end_section_nr / sections_per_block;
@@ -137,8 +136,7 @@ static ssize_t show_mem_removable(struct device *dev,
{
unsigned long i, pfn;
int ret = 1;
struct memory_block *mem =
container_of(dev, struct memory_block, dev);
struct memory_block *mem = to_memory_block(dev);
for (i = 0; i < sections_per_block; i++) {
if (!present_section_nr(mem->start_section_nr + i))
@@ -156,8 +154,7 @@ static ssize_t show_mem_removable(struct device *dev,
static ssize_t show_mem_state(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct memory_block *mem =
container_of(dev, struct memory_block, dev);
struct memory_block *mem = to_memory_block(dev);
ssize_t len = 0;
/*
@@ -263,9 +260,8 @@ memory_block_action(unsigned long phys_index, unsigned long action, int online_t
return ret;
}
static int __memory_block_change_state(struct memory_block *mem,
unsigned long to_state, unsigned long from_state_req,
int online_type)
static int memory_block_change_state(struct memory_block *mem,
unsigned long to_state, unsigned long from_state_req)
{
int ret = 0;
@@ -275,105 +271,89 @@ static int __memory_block_change_state(struct memory_block *mem,
if (to_state == MEM_OFFLINE)
mem->state = MEM_GOING_OFFLINE;
ret = memory_block_action(mem->start_section_nr, to_state, online_type);
ret = memory_block_action(mem->start_section_nr, to_state,
mem->online_type);
mem->state = ret ? from_state_req : to_state;
return ret;
}
/* The device lock serializes operations on memory_subsys_[online|offline] */
static int memory_subsys_online(struct device *dev)
{
struct memory_block *mem = container_of(dev, struct memory_block, dev);
struct memory_block *mem = to_memory_block(dev);
int ret;
mutex_lock(&mem->state_mutex);
if (mem->state == MEM_ONLINE)
return 0;
ret = mem->state == MEM_ONLINE ? 0 :
__memory_block_change_state(mem, MEM_ONLINE, MEM_OFFLINE,
ONLINE_KEEP);
/*
* If we are called from store_mem_state(), online_type will be
* set >= 0 Otherwise we were called from the device online
* attribute and need to set the online_type.
*/
if (mem->online_type < 0)
mem->online_type = ONLINE_KEEP;
ret = memory_block_change_state(mem, MEM_ONLINE, MEM_OFFLINE);
/* clear online_type */
mem->online_type = -1;
mutex_unlock(&mem->state_mutex);
return ret;
}
static int memory_subsys_offline(struct device *dev)
{
struct memory_block *mem = container_of(dev, struct memory_block, dev);
int ret;
struct memory_block *mem = to_memory_block(dev);
mutex_lock(&mem->state_mutex);
if (mem->state == MEM_OFFLINE)
return 0;
ret = mem->state == MEM_OFFLINE ? 0 :
__memory_block_change_state(mem, MEM_OFFLINE, MEM_ONLINE, -1);
mutex_unlock(&mem->state_mutex);
return ret;
return memory_block_change_state(mem, MEM_OFFLINE, MEM_ONLINE);
}
static int __memory_block_change_state_uevent(struct memory_block *mem,
unsigned long to_state, unsigned long from_state_req,
int online_type)
{
int ret = __memory_block_change_state(mem, to_state, from_state_req,
online_type);
if (!ret) {
switch (mem->state) {
case MEM_OFFLINE:
kobject_uevent(&mem->dev.kobj, KOBJ_OFFLINE);
break;
case MEM_ONLINE:
kobject_uevent(&mem->dev.kobj, KOBJ_ONLINE);
break;
default:
break;
}
}
return ret;
}
static int memory_block_change_state(struct memory_block *mem,
unsigned long to_state, unsigned long from_state_req,
int online_type)
{
int ret;
mutex_lock(&mem->state_mutex);
ret = __memory_block_change_state_uevent(mem, to_state, from_state_req,
online_type);
mutex_unlock(&mem->state_mutex);
return ret;
}
static ssize_t
store_mem_state(struct device *dev,
struct device_attribute *attr, const char *buf, size_t count)
{
struct memory_block *mem;
bool offline;
int ret = -EINVAL;
mem = container_of(dev, struct memory_block, dev);
struct memory_block *mem = to_memory_block(dev);
int ret, online_type;
lock_device_hotplug();
if (!strncmp(buf, "online_kernel", min_t(int, count, 13))) {
offline = false;
ret = memory_block_change_state(mem, MEM_ONLINE,
MEM_OFFLINE, ONLINE_KERNEL);
} else if (!strncmp(buf, "online_movable", min_t(int, count, 14))) {
offline = false;
ret = memory_block_change_state(mem, MEM_ONLINE,
MEM_OFFLINE, ONLINE_MOVABLE);
} else if (!strncmp(buf, "online", min_t(int, count, 6))) {
offline = false;
ret = memory_block_change_state(mem, MEM_ONLINE,
MEM_OFFLINE, ONLINE_KEEP);
} else if(!strncmp(buf, "offline", min_t(int, count, 7))) {
offline = true;
ret = memory_block_change_state(mem, MEM_OFFLINE,
MEM_ONLINE, -1);
if (!strncmp(buf, "online_kernel", min_t(int, count, 13)))
online_type = ONLINE_KERNEL;
else if (!strncmp(buf, "online_movable", min_t(int, count, 14)))
online_type = ONLINE_MOVABLE;
else if (!strncmp(buf, "online", min_t(int, count, 6)))
online_type = ONLINE_KEEP;
else if (!strncmp(buf, "offline", min_t(int, count, 7)))
online_type = -1;
else
return -EINVAL;
switch (online_type) {
case ONLINE_KERNEL:
case ONLINE_MOVABLE:
case ONLINE_KEEP:
/*
* mem->online_type is not protected so there can be a
* race here. However, when racing online, the first
* will succeed and the second will just return as the
* block will already be online. The online type
* could be either one, but that is expected.
*/
mem->online_type = online_type;
ret = device_online(&mem->dev);
break;
case -1:
ret = device_offline(&mem->dev);
break;
default:
ret = -EINVAL; /* should never happen */
}
if (!ret)
dev->offline = offline;
unlock_device_hotplug();
@@ -394,8 +374,7 @@ store_mem_state(struct device *dev,
static ssize_t show_phys_device(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct memory_block *mem =
container_of(dev, struct memory_block, dev);
struct memory_block *mem = to_memory_block(dev);
return sprintf(buf, "%d\n", mem->phys_device);
}
@@ -471,7 +450,7 @@ store_soft_offline_page(struct device *dev,
u64 pfn;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
if (strict_strtoull(buf, 0, &pfn) < 0)
if (kstrtoull(buf, 0, &pfn) < 0)
return -EINVAL;
pfn >>= PAGE_SHIFT;
if (!pfn_valid(pfn))
@@ -490,7 +469,7 @@ store_hard_offline_page(struct device *dev,
u64 pfn;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
if (strict_strtoull(buf, 0, &pfn) < 0)
if (kstrtoull(buf, 0, &pfn) < 0)
return -EINVAL;
pfn >>= PAGE_SHIFT;
ret = memory_failure(pfn, 0, 0);
@@ -527,7 +506,7 @@ struct memory_block *find_memory_block_hinted(struct mem_section *section,
put_device(&hint->dev);
if (!dev)
return NULL;
return container_of(dev, struct memory_block, dev);
return to_memory_block(dev);
}
/*
@@ -567,16 +546,13 @@ static const struct attribute_group *memory_memblk_attr_groups[] = {
static
int register_memory(struct memory_block *memory)
{
int error;
memory->dev.bus = &memory_subsys;
memory->dev.id = memory->start_section_nr / sections_per_block;
memory->dev.release = memory_block_release;
memory->dev.groups = memory_memblk_attr_groups;
memory->dev.offline = memory->state == MEM_OFFLINE;
error = device_register(&memory->dev);
return error;
return device_register(&memory->dev);
}
static int init_memory_block(struct memory_block **memory,
@@ -597,7 +573,6 @@ static int init_memory_block(struct memory_block **memory,
mem->end_section_nr = mem->start_section_nr + sections_per_block - 1;
mem->state = state;
mem->section_count++;
mutex_init(&mem->state_mutex);
start_pfn = section_nr_to_pfn(mem->start_section_nr);
mem->phys_device = arch_get_memory_phys_device(start_pfn);
@@ -607,55 +582,57 @@ static int init_memory_block(struct memory_block **memory,
return ret;
}
static int add_memory_section(int nid, struct mem_section *section,
struct memory_block **mem_p,
unsigned long state, enum mem_add_context context)
static int add_memory_block(int base_section_nr)
{
struct memory_block *mem = NULL;
int scn_nr = __section_nr(section);
int ret = 0;
struct memory_block *mem;
int i, ret, section_count = 0, section_nr;
mutex_lock(&mem_sysfs_mutex);
if (context == BOOT) {
/* same memory block ? */
if (mem_p && *mem_p)
if (scn_nr >= (*mem_p)->start_section_nr &&
scn_nr <= (*mem_p)->end_section_nr) {
mem = *mem_p;
kobject_get(&mem->dev.kobj);
}
} else
mem = find_memory_block(section);
if (mem) {
mem->section_count++;
kobject_put(&mem->dev.kobj);
} else {
ret = init_memory_block(&mem, section, state);
/* store memory_block pointer for next loop */
if (!ret && context == BOOT)
if (mem_p)
*mem_p = mem;
for (i = base_section_nr;
(i < base_section_nr + sections_per_block) && i < NR_MEM_SECTIONS;
i++) {
if (!present_section_nr(i))
continue;
if (section_count == 0)
section_nr = i;
section_count++;
}
if (!ret) {
if (context == HOTPLUG &&
mem->section_count == sections_per_block)
ret = register_mem_sect_under_node(mem, nid);
}
mutex_unlock(&mem_sysfs_mutex);
return ret;
if (section_count == 0)
return 0;
ret = init_memory_block(&mem, __nr_to_section(section_nr), MEM_ONLINE);
if (ret)
return ret;
mem->section_count = section_count;
return 0;
}
/*
* need an interface for the VM to add new memory regions,
* but without onlining it.
*/
int register_new_memory(int nid, struct mem_section *section)
{
return add_memory_section(nid, section, NULL, MEM_OFFLINE, HOTPLUG);
int ret = 0;
struct memory_block *mem;
mutex_lock(&mem_sysfs_mutex);
mem = find_memory_block(section);
if (mem) {
mem->section_count++;
put_device(&mem->dev);
} else {
ret = init_memory_block(&mem, section, MEM_OFFLINE);
if (ret)
goto out;
}
if (mem->section_count == sections_per_block)
ret = register_mem_sect_under_node(mem, nid);
out:
mutex_unlock(&mem_sysfs_mutex);
return ret;
}
#ifdef CONFIG_MEMORY_HOTREMOVE
@@ -665,7 +642,7 @@ unregister_memory(struct memory_block *memory)
BUG_ON(memory->dev.bus != &memory_subsys);
/* drop the ref. we got in remove_memory_block() */
kobject_put(&memory->dev.kobj);
put_device(&memory->dev);
device_unregister(&memory->dev);
}
@@ -682,7 +659,7 @@ static int remove_memory_block(unsigned long node_id,
if (mem->section_count == 0)
unregister_memory(mem);
else
kobject_put(&mem->dev.kobj);
put_device(&mem->dev);
mutex_unlock(&mem_sysfs_mutex);
return 0;
@@ -735,7 +712,6 @@ int __init memory_dev_init(void)
int ret;
int err;
unsigned long block_sz;
struct memory_block *mem = NULL;
ret = subsys_system_register(&memory_subsys, memory_root_attr_groups);
if (ret)
@@ -748,17 +724,13 @@ int __init memory_dev_init(void)
* Create entries for memory sections that were found
* during boot and have been initialized
*/
for (i = 0; i < NR_MEM_SECTIONS; i++) {
if (!present_section_nr(i))
continue;
/* don't need to reuse memory_block if only one per block */
err = add_memory_section(0, __nr_to_section(i),
(sections_per_block == 1) ? NULL : &mem,
MEM_ONLINE,
BOOT);
mutex_lock(&mem_sysfs_mutex);
for (i = 0; i < NR_MEM_SECTIONS; i += sections_per_block) {
err = add_memory_block(i);
if (!ret)
ret = err;
}
mutex_unlock(&mem_sysfs_mutex);
out:
if (ret)