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-rw-r--r--drivers/base/core.c34
-rw-r--r--drivers/base/firmware_class.c7
-rw-r--r--drivers/base/memory.c197
-rw-r--r--drivers/base/node.c12
-rw-r--r--drivers/base/sys.c65
5 files changed, 232 insertions, 83 deletions
diff --git a/drivers/base/core.c b/drivers/base/core.c
index 080e9ca..81b78ed 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -1320,7 +1320,10 @@ struct root_device
struct module *owner;
};
-#define to_root_device(dev) container_of(dev, struct root_device, dev)
+inline struct root_device *to_root_device(struct device *d)
+{
+ return container_of(d, struct root_device, dev);
+}
static void root_device_release(struct device *dev)
{
@@ -1551,7 +1554,34 @@ EXPORT_SYMBOL_GPL(device_destroy);
* on the same device to ensure that new_name is valid and
* won't conflict with other devices.
*
- * "Never use this function, bad things will happen" - gregkh
+ * Note: Don't call this function. Currently, the networking layer calls this
+ * function, but that will change. The following text from Kay Sievers offers
+ * some insight:
+ *
+ * Renaming devices is racy at many levels, symlinks and other stuff are not
+ * replaced atomically, and you get a "move" uevent, but it's not easy to
+ * connect the event to the old and new device. Device nodes are not renamed at
+ * all, there isn't even support for that in the kernel now.
+ *
+ * In the meantime, during renaming, your target name might be taken by another
+ * driver, creating conflicts. Or the old name is taken directly after you
+ * renamed it -- then you get events for the same DEVPATH, before you even see
+ * the "move" event. It's just a mess, and nothing new should ever rely on
+ * kernel device renaming. Besides that, it's not even implemented now for
+ * other things than (driver-core wise very simple) network devices.
+ *
+ * We are currently about to change network renaming in udev to completely
+ * disallow renaming of devices in the same namespace as the kernel uses,
+ * because we can't solve the problems properly, that arise with swapping names
+ * of multiple interfaces without races. Means, renaming of eth[0-9]* will only
+ * be allowed to some other name than eth[0-9]*, for the aforementioned
+ * reasons.
+ *
+ * Make up a "real" name in the driver before you register anything, or add
+ * some other attributes for userspace to find the device, or use udev to add
+ * symlinks -- but never rename kernel devices later, it's a complete mess. We
+ * don't even want to get into that and try to implement the missing pieces in
+ * the core. We really have other pieces to fix in the driver core mess. :)
*/
int device_rename(struct device *dev, const char *new_name)
{
diff --git a/drivers/base/firmware_class.c b/drivers/base/firmware_class.c
index 40af43e..8c798ef 100644
--- a/drivers/base/firmware_class.c
+++ b/drivers/base/firmware_class.c
@@ -593,8 +593,7 @@ int
request_firmware(const struct firmware **firmware_p, const char *name,
struct device *device)
{
- int uevent = 1;
- return _request_firmware(firmware_p, name, device, uevent, false);
+ return _request_firmware(firmware_p, name, device, true, false);
}
/**
@@ -618,7 +617,7 @@ struct firmware_work {
struct device *device;
void *context;
void (*cont)(const struct firmware *fw, void *context);
- int uevent;
+ bool uevent;
};
static int request_firmware_work_func(void *arg)
@@ -661,7 +660,7 @@ static int request_firmware_work_func(void *arg)
**/
int
request_firmware_nowait(
- struct module *module, int uevent,
+ struct module *module, bool uevent,
const char *name, struct device *device, gfp_t gfp, void *context,
void (*cont)(const struct firmware *fw, void *context))
{
diff --git a/drivers/base/memory.c b/drivers/base/memory.c
index cafeaaf..3da6a43 100644
--- a/drivers/base/memory.c
+++ b/drivers/base/memory.c
@@ -30,6 +30,14 @@
static DEFINE_MUTEX(mem_sysfs_mutex);
#define MEMORY_CLASS_NAME "memory"
+#define MIN_MEMORY_BLOCK_SIZE (1 << SECTION_SIZE_BITS)
+
+static int sections_per_block;
+
+static inline int base_memory_block_id(int section_nr)
+{
+ return section_nr / sections_per_block;
+}
static struct sysdev_class memory_sysdev_class = {
.name = MEMORY_CLASS_NAME,
@@ -84,39 +92,72 @@ EXPORT_SYMBOL(unregister_memory_isolate_notifier);
* register_memory - Setup a sysfs device for a memory block
*/
static
-int register_memory(struct memory_block *memory, struct mem_section *section)
+int register_memory(struct memory_block *memory)
{
int error;
memory->sysdev.cls = &memory_sysdev_class;
- memory->sysdev.id = __section_nr(section);
+ memory->sysdev.id = memory->start_section_nr / sections_per_block;
error = sysdev_register(&memory->sysdev);
return error;
}
static void
-unregister_memory(struct memory_block *memory, struct mem_section *section)
+unregister_memory(struct memory_block *memory)
{
BUG_ON(memory->sysdev.cls != &memory_sysdev_class);
- BUG_ON(memory->sysdev.id != __section_nr(section));
/* drop the ref. we got in remove_memory_block() */
kobject_put(&memory->sysdev.kobj);
sysdev_unregister(&memory->sysdev);
}
+unsigned long __weak memory_block_size_bytes(void)
+{
+ return MIN_MEMORY_BLOCK_SIZE;
+}
+
+static unsigned long get_memory_block_size(void)
+{
+ unsigned long block_sz;
+
+ block_sz = memory_block_size_bytes();
+
+ /* Validate blk_sz is a power of 2 and not less than section size */
+ if ((block_sz & (block_sz - 1)) || (block_sz < MIN_MEMORY_BLOCK_SIZE)) {
+ WARN_ON(1);
+ block_sz = MIN_MEMORY_BLOCK_SIZE;
+ }
+
+ return block_sz;
+}
+
/*
* use this as the physical section index that this memsection
* uses.
*/
-static ssize_t show_mem_phys_index(struct sys_device *dev,
+static ssize_t show_mem_start_phys_index(struct sys_device *dev,
struct sysdev_attribute *attr, char *buf)
{
struct memory_block *mem =
container_of(dev, struct memory_block, sysdev);
- return sprintf(buf, "%08lx\n", mem->phys_index);
+ unsigned long phys_index;
+
+ phys_index = mem->start_section_nr / sections_per_block;
+ return sprintf(buf, "%08lx\n", phys_index);
+}
+
+static ssize_t show_mem_end_phys_index(struct sys_device *dev,
+ struct sysdev_attribute *attr, char *buf)
+{
+ struct memory_block *mem =
+ container_of(dev, struct memory_block, sysdev);
+ unsigned long phys_index;
+
+ phys_index = mem->end_section_nr / sections_per_block;
+ return sprintf(buf, "%08lx\n", phys_index);
}
/*
@@ -125,13 +166,16 @@ static ssize_t show_mem_phys_index(struct sys_device *dev,
static ssize_t show_mem_removable(struct sys_device *dev,
struct sysdev_attribute *attr, char *buf)
{
- unsigned long start_pfn;
- int ret;
+ unsigned long i, pfn;
+ int ret = 1;
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);
+ for (i = 0; i < sections_per_block; i++) {
+ pfn = section_nr_to_pfn(mem->start_section_nr + i);
+ ret &= is_mem_section_removable(pfn, PAGES_PER_SECTION);
+ }
+
return sprintf(buf, "%d\n", ret);
}
@@ -184,17 +228,14 @@ int memory_isolate_notify(unsigned long val, void *v)
* OK to have direct references to sparsemem variables in here.
*/
static int
-memory_block_action(struct memory_block *mem, unsigned long action)
+memory_section_action(unsigned long phys_index, unsigned long action)
{
int i;
- unsigned long psection;
unsigned long start_pfn, start_paddr;
struct page *first_page;
int ret;
- int old_state = mem->state;
- psection = mem->phys_index;
- first_page = pfn_to_page(psection << PFN_SECTION_SHIFT);
+ first_page = pfn_to_page(phys_index << PFN_SECTION_SHIFT);
/*
* The probe routines leave the pages reserved, just
@@ -207,8 +248,8 @@ memory_block_action(struct memory_block *mem, unsigned long action)
continue;
printk(KERN_WARNING "section number %ld page number %d "
- "not reserved, was it already online? \n",
- psection, i);
+ "not reserved, was it already online?\n",
+ phys_index, i);
return -EBUSY;
}
}
@@ -219,18 +260,13 @@ memory_block_action(struct memory_block *mem, unsigned long action)
ret = online_pages(start_pfn, PAGES_PER_SECTION);
break;
case MEM_OFFLINE:
- mem->state = MEM_GOING_OFFLINE;
start_paddr = page_to_pfn(first_page) << PAGE_SHIFT;
ret = remove_memory(start_paddr,
PAGES_PER_SECTION << PAGE_SHIFT);
- if (ret) {
- mem->state = old_state;
- break;
- }
break;
default:
- WARN(1, KERN_WARNING "%s(%p, %ld) unknown action: %ld\n",
- __func__, mem, action, action);
+ WARN(1, KERN_WARNING "%s(%ld, %ld) unknown action: "
+ "%ld\n", __func__, phys_index, action, action);
ret = -EINVAL;
}
@@ -240,7 +276,8 @@ memory_block_action(struct memory_block *mem, unsigned long action)
static int memory_block_change_state(struct memory_block *mem,
unsigned long to_state, unsigned long from_state_req)
{
- int ret = 0;
+ int i, ret = 0;
+
mutex_lock(&mem->state_mutex);
if (mem->state != from_state_req) {
@@ -248,8 +285,23 @@ static int memory_block_change_state(struct memory_block *mem,
goto out;
}
- ret = memory_block_action(mem, to_state);
- if (!ret)
+ if (to_state == MEM_OFFLINE)
+ mem->state = MEM_GOING_OFFLINE;
+
+ for (i = 0; i < sections_per_block; i++) {
+ ret = memory_section_action(mem->start_section_nr + i,
+ to_state);
+ if (ret)
+ break;
+ }
+
+ if (ret) {
+ for (i = 0; i < sections_per_block; i++)
+ memory_section_action(mem->start_section_nr + i,
+ from_state_req);
+
+ mem->state = from_state_req;
+ } else
mem->state = to_state;
out:
@@ -262,20 +314,15 @@ store_mem_state(struct sys_device *dev,
struct sysdev_attribute *attr, const char *buf, size_t count)
{
struct memory_block *mem;
- unsigned int phys_section_nr;
int ret = -EINVAL;
mem = container_of(dev, struct memory_block, sysdev);
- phys_section_nr = mem->phys_index;
-
- if (!present_section_nr(phys_section_nr))
- goto out;
if (!strncmp(buf, "online", min((int)count, 6)))
ret = memory_block_change_state(mem, MEM_ONLINE, MEM_OFFLINE);
else if(!strncmp(buf, "offline", min((int)count, 7)))
ret = memory_block_change_state(mem, MEM_OFFLINE, MEM_ONLINE);
-out:
+
if (ret)
return ret;
return count;
@@ -298,7 +345,8 @@ static ssize_t show_phys_device(struct sys_device *dev,
return sprintf(buf, "%d\n", mem->phys_device);
}
-static SYSDEV_ATTR(phys_index, 0444, show_mem_phys_index, NULL);
+static SYSDEV_ATTR(phys_index, 0444, show_mem_start_phys_index, NULL);
+static SYSDEV_ATTR(end_phys_index, 0444, show_mem_end_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);
@@ -315,7 +363,7 @@ static ssize_t
print_block_size(struct sysdev_class *class, struct sysdev_class_attribute *attr,
char *buf)
{
- return sprintf(buf, "%lx\n", (unsigned long)PAGES_PER_SECTION * PAGE_SIZE);
+ return sprintf(buf, "%lx\n", get_memory_block_size());
}
static SYSDEV_CLASS_ATTR(block_size_bytes, 0444, print_block_size, NULL);
@@ -339,12 +387,19 @@ memory_probe_store(struct class *class, struct class_attribute *attr,
{
u64 phys_addr;
int nid;
- int ret;
+ int i, ret;
phys_addr = simple_strtoull(buf, NULL, 0);
- nid = memory_add_physaddr_to_nid(phys_addr);
- ret = add_memory(nid, phys_addr, PAGES_PER_SECTION << PAGE_SHIFT);
+ for (i = 0; i < sections_per_block; i++) {
+ nid = memory_add_physaddr_to_nid(phys_addr);
+ ret = add_memory(nid, phys_addr,
+ PAGES_PER_SECTION << PAGE_SHIFT);
+ if (ret)
+ break;
+
+ phys_addr += MIN_MEMORY_BLOCK_SIZE;
+ }
if (ret)
count = ret;
@@ -444,6 +499,7 @@ struct memory_block *find_memory_block_hinted(struct mem_section *section,
struct sys_device *sysdev;
struct memory_block *mem;
char name[sizeof(MEMORY_CLASS_NAME) + 9 + 1];
+ int block_id = base_memory_block_id(__section_nr(section));
kobj = hint ? &hint->sysdev.kobj : NULL;
@@ -451,7 +507,7 @@ struct memory_block *find_memory_block_hinted(struct mem_section *section,
* This only works because we know that section == sysdev->id
* slightly redundant with sysdev_register()
*/
- sprintf(&name[0], "%s%d", MEMORY_CLASS_NAME, __section_nr(section));
+ sprintf(&name[0], "%s%d", MEMORY_CLASS_NAME, block_id);
kobj = kset_find_obj_hinted(&memory_sysdev_class.kset, name, kobj);
if (!kobj)
@@ -476,36 +532,62 @@ struct memory_block *find_memory_block(struct mem_section *section)
return find_memory_block_hinted(section, NULL);
}
-static int add_memory_block(int nid, struct mem_section *section,
- unsigned long state, enum mem_add_context context)
+static int init_memory_block(struct memory_block **memory,
+ struct mem_section *section, unsigned long state)
{
- struct memory_block *mem = kzalloc(sizeof(*mem), GFP_KERNEL);
+ struct memory_block *mem;
unsigned long start_pfn;
+ int scn_nr;
int ret = 0;
+ mem = kzalloc(sizeof(*mem), GFP_KERNEL);
if (!mem)
return -ENOMEM;
- mutex_lock(&mem_sysfs_mutex);
-
- mem->phys_index = __section_nr(section);
+ scn_nr = __section_nr(section);
+ mem->start_section_nr =
+ base_memory_block_id(scn_nr) * sections_per_block;
+ 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->phys_index);
+ start_pfn = section_nr_to_pfn(mem->start_section_nr);
mem->phys_device = arch_get_memory_phys_device(start_pfn);
- ret = register_memory(mem, section);
+ ret = register_memory(mem);
if (!ret)
ret = mem_create_simple_file(mem, phys_index);
if (!ret)
+ ret = mem_create_simple_file(mem, end_phys_index);
+ if (!ret)
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);
+
+ *memory = mem;
+ return ret;
+}
+
+static int add_memory_section(int nid, struct mem_section *section,
+ unsigned long state, enum mem_add_context context)
+{
+ struct memory_block *mem;
+ int ret = 0;
+
+ mutex_lock(&mem_sysfs_mutex);
+
+ mem = find_memory_block(section);
+ if (mem) {
+ mem->section_count++;
+ kobject_put(&mem->sysdev.kobj);
+ } else
+ ret = init_memory_block(&mem, section, state);
+
if (!ret) {
- if (context == HOTPLUG)
+ if (context == HOTPLUG &&
+ mem->section_count == sections_per_block)
ret = register_mem_sect_under_node(mem, nid);
}
@@ -520,16 +602,19 @@ int remove_memory_block(unsigned long node_id, struct mem_section *section,
mutex_lock(&mem_sysfs_mutex);
mem = find_memory_block(section);
+ unregister_mem_sect_under_nodes(mem, __section_nr(section));
mem->section_count--;
if (mem->section_count == 0) {
- unregister_mem_sect_under_nodes(mem);
mem_remove_simple_file(mem, phys_index);
+ mem_remove_simple_file(mem, end_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);
- }
+ unregister_memory(mem);
+ kfree(mem);
+ } else
+ kobject_put(&mem->sysdev.kobj);
mutex_unlock(&mem_sysfs_mutex);
return 0;
@@ -541,7 +626,7 @@ int remove_memory_block(unsigned long node_id, struct mem_section *section,
*/
int register_new_memory(int nid, struct mem_section *section)
{
- return add_memory_block(nid, section, MEM_OFFLINE, HOTPLUG);
+ return add_memory_section(nid, section, MEM_OFFLINE, HOTPLUG);
}
int unregister_memory_section(struct mem_section *section)
@@ -560,12 +645,16 @@ int __init memory_dev_init(void)
unsigned int i;
int ret;
int err;
+ unsigned long block_sz;
memory_sysdev_class.kset.uevent_ops = &memory_uevent_ops;
ret = sysdev_class_register(&memory_sysdev_class);
if (ret)
goto out;
+ block_sz = get_memory_block_size();
+ sections_per_block = block_sz / MIN_MEMORY_BLOCK_SIZE;
+
/*
* Create entries for memory sections that were found
* during boot and have been initialized
@@ -573,8 +662,8 @@ 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,
- BOOT);
+ err = add_memory_section(0, __nr_to_section(i), MEM_ONLINE,
+ BOOT);
if (!ret)
ret = err;
}
diff --git a/drivers/base/node.c b/drivers/base/node.c
index 36b4305..b3b72d6 100644
--- a/drivers/base/node.c
+++ b/drivers/base/node.c
@@ -375,8 +375,10 @@ int register_mem_sect_under_node(struct memory_block *mem_blk, int nid)
return -EFAULT;
if (!node_online(nid))
return 0;
- sect_start_pfn = section_nr_to_pfn(mem_blk->phys_index);
- sect_end_pfn = sect_start_pfn + PAGES_PER_SECTION - 1;
+
+ sect_start_pfn = section_nr_to_pfn(mem_blk->start_section_nr);
+ sect_end_pfn = section_nr_to_pfn(mem_blk->end_section_nr);
+ sect_end_pfn += PAGES_PER_SECTION - 1;
for (pfn = sect_start_pfn; pfn <= sect_end_pfn; pfn++) {
int page_nid;
@@ -400,7 +402,8 @@ int register_mem_sect_under_node(struct memory_block *mem_blk, int nid)
}
/* unregister memory section under all nodes that it spans */
-int unregister_mem_sect_under_nodes(struct memory_block *mem_blk)
+int unregister_mem_sect_under_nodes(struct memory_block *mem_blk,
+ unsigned long phys_index)
{
NODEMASK_ALLOC(nodemask_t, unlinked_nodes, GFP_KERNEL);
unsigned long pfn, sect_start_pfn, sect_end_pfn;
@@ -412,7 +415,8 @@ int unregister_mem_sect_under_nodes(struct memory_block *mem_blk)
if (!unlinked_nodes)
return -ENOMEM;
nodes_clear(*unlinked_nodes);
- sect_start_pfn = section_nr_to_pfn(mem_blk->phys_index);
+
+ sect_start_pfn = section_nr_to_pfn(phys_index);
sect_end_pfn = sect_start_pfn + PAGES_PER_SECTION - 1;
for (pfn = sect_start_pfn; pfn <= sect_end_pfn; pfn++) {
int nid;
diff --git a/drivers/base/sys.c b/drivers/base/sys.c
index 1667aaf..f6fb547 100644
--- a/drivers/base/sys.c
+++ b/drivers/base/sys.c
@@ -166,6 +166,36 @@ EXPORT_SYMBOL_GPL(sysdev_class_unregister);
static DEFINE_MUTEX(sysdev_drivers_lock);
+/*
+ * @dev != NULL means that we're unwinding because some drv->add()
+ * failed for some reason. You need to grab sysdev_drivers_lock before
+ * calling this.
+ */
+static void __sysdev_driver_remove(struct sysdev_class *cls,
+ struct sysdev_driver *drv,
+ struct sys_device *from_dev)
+{
+ struct sys_device *dev = from_dev;
+
+ list_del_init(&drv->entry);
+ if (!cls)
+ return;
+
+ if (!drv->remove)
+ goto kset_put;
+
+ if (dev)
+ list_for_each_entry_continue_reverse(dev, &cls->kset.list,
+ kobj.entry)
+ drv->remove(dev);
+ else
+ list_for_each_entry(dev, &cls->kset.list, kobj.entry)
+ drv->remove(dev);
+
+kset_put:
+ kset_put(&cls->kset);
+}
+
/**
* sysdev_driver_register - Register auxillary driver
* @cls: Device class driver belongs to.
@@ -175,14 +205,14 @@ static DEFINE_MUTEX(sysdev_drivers_lock);
* called on each operation on devices of that class. The refcount
* of @cls is incremented.
*/
-
int sysdev_driver_register(struct sysdev_class *cls, struct sysdev_driver *drv)
{
+ struct sys_device *dev = NULL;
int err = 0;
if (!cls) {
- WARN(1, KERN_WARNING "sysdev: invalid class passed to "
- "sysdev_driver_register!\n");
+ WARN(1, KERN_WARNING "sysdev: invalid class passed to %s!\n",
+ __func__);
return -EINVAL;
}
@@ -198,19 +228,27 @@ int sysdev_driver_register(struct sysdev_class *cls, struct sysdev_driver *drv)
/* If devices of this class already exist, tell the driver */
if (drv->add) {
- struct sys_device *dev;
- list_for_each_entry(dev, &cls->kset.list, kobj.entry)
- drv->add(dev);
+ list_for_each_entry(dev, &cls->kset.list, kobj.entry) {
+ err = drv->add(dev);
+ if (err)
+ goto unwind;
+ }
}
} else {
err = -EINVAL;
WARN(1, KERN_ERR "%s: invalid device class\n", __func__);
}
+
+ goto unlock;
+
+unwind:
+ __sysdev_driver_remove(cls, drv, dev);
+
+unlock:
mutex_unlock(&sysdev_drivers_lock);
return err;
}
-
/**
* sysdev_driver_unregister - Remove an auxillary driver.
* @cls: Class driver belongs to.
@@ -220,23 +258,12 @@ void sysdev_driver_unregister(struct sysdev_class *cls,
struct sysdev_driver *drv)
{
mutex_lock(&sysdev_drivers_lock);
- list_del_init(&drv->entry);
- if (cls) {
- if (drv->remove) {
- struct sys_device *dev;
- list_for_each_entry(dev, &cls->kset.list, kobj.entry)
- drv->remove(dev);
- }
- kset_put(&cls->kset);
- }
+ __sysdev_driver_remove(cls, drv, NULL);
mutex_unlock(&sysdev_drivers_lock);
}
-
EXPORT_SYMBOL_GPL(sysdev_driver_register);
EXPORT_SYMBOL_GPL(sysdev_driver_unregister);
-
-
/**
* sysdev_register - add a system device to the tree
* @sysdev: device in question
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