2005-10-29 19:16:54 -06:00
|
|
|
/*
|
|
|
|
* drivers/base/memory.c - basic Memory class support
|
|
|
|
*
|
|
|
|
* Written by Matt Tolentino <matthew.e.tolentino@intel.com>
|
|
|
|
* Dave Hansen <haveblue@us.ibm.com>
|
|
|
|
*
|
|
|
|
* This file provides the necessary infrastructure to represent
|
|
|
|
* a SPARSEMEM-memory-model system's physical memory in /sysfs.
|
|
|
|
* All arch-independent code that assumes MEMORY_HOTPLUG requires
|
|
|
|
* SPARSEMEM should be contained here, or in mm/memory_hotplug.c.
|
|
|
|
*/
|
|
|
|
|
|
|
|
#include <linux/sysdev.h>
|
|
|
|
#include <linux/module.h>
|
|
|
|
#include <linux/init.h>
|
|
|
|
#include <linux/topology.h>
|
2006-01-11 13:17:46 -07:00
|
|
|
#include <linux/capability.h>
|
2005-10-29 19:16:54 -06:00
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|
|
#include <linux/device.h>
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|
|
|
#include <linux/memory.h>
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|
|
|
#include <linux/kobject.h>
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|
|
|
#include <linux/memory_hotplug.h>
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|
|
|
#include <linux/mm.h>
|
2008-02-05 00:35:47 -07:00
|
|
|
#include <linux/mutex.h>
|
2008-10-18 21:27:12 -06:00
|
|
|
#include <linux/stat.h>
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|
|
|
2005-10-29 19:16:54 -06:00
|
|
|
#include <asm/atomic.h>
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|
|
#include <asm/uaccess.h>
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|
|
#define MEMORY_CLASS_NAME "memory"
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|
|
static struct sysdev_class memory_sysdev_class = {
|
2007-12-19 18:09:39 -07:00
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|
|
.name = MEMORY_CLASS_NAME,
|
2005-10-29 19:16:54 -06:00
|
|
|
};
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|
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|
2005-11-16 01:00:00 -07:00
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|
|
static const char *memory_uevent_name(struct kset *kset, struct kobject *kobj)
|
2005-10-29 19:16:54 -06:00
|
|
|
{
|
|
|
|
return MEMORY_CLASS_NAME;
|
|
|
|
}
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|
|
|
|
2007-10-13 23:53:45 -06:00
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|
|
static int memory_uevent(struct kset *kset, struct kobject *obj, struct kobj_uevent_env *env)
|
2005-10-29 19:16:54 -06:00
|
|
|
{
|
|
|
|
int retval = 0;
|
|
|
|
|
|
|
|
return retval;
|
|
|
|
}
|
|
|
|
|
2005-11-16 01:00:00 -07:00
|
|
|
static struct kset_uevent_ops memory_uevent_ops = {
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|
|
|
.name = memory_uevent_name,
|
|
|
|
.uevent = memory_uevent,
|
2005-10-29 19:16:54 -06:00
|
|
|
};
|
|
|
|
|
[PATCH] Notifier chain update: API changes
The kernel's implementation of notifier chains is unsafe. There is no
protection against entries being added to or removed from a chain while the
chain is in use. The issues were discussed in this thread:
http://marc.theaimsgroup.com/?l=linux-kernel&m=113018709002036&w=2
We noticed that notifier chains in the kernel fall into two basic usage
classes:
"Blocking" chains are always called from a process context
and the callout routines are allowed to sleep;
"Atomic" chains can be called from an atomic context and
the callout routines are not allowed to sleep.
We decided to codify this distinction and make it part of the API. Therefore
this set of patches introduces three new, parallel APIs: one for blocking
notifiers, one for atomic notifiers, and one for "raw" notifiers (which is
really just the old API under a new name). New kinds of data structures are
used for the heads of the chains, and new routines are defined for
registration, unregistration, and calling a chain. The three APIs are
explained in include/linux/notifier.h and their implementation is in
kernel/sys.c.
With atomic and blocking chains, the implementation guarantees that the chain
links will not be corrupted and that chain callers will not get messed up by
entries being added or removed. For raw chains the implementation provides no
guarantees at all; users of this API must provide their own protections. (The
idea was that situations may come up where the assumptions of the atomic and
blocking APIs are not appropriate, so it should be possible for users to
handle these things in their own way.)
There are some limitations, which should not be too hard to live with. For
atomic/blocking chains, registration and unregistration must always be done in
a process context since the chain is protected by a mutex/rwsem. Also, a
callout routine for a non-raw chain must not try to register or unregister
entries on its own chain. (This did happen in a couple of places and the code
had to be changed to avoid it.)
Since atomic chains may be called from within an NMI handler, they cannot use
spinlocks for synchronization. Instead we use RCU. The overhead falls almost
entirely in the unregister routine, which is okay since unregistration is much
less frequent that calling a chain.
Here is the list of chains that we adjusted and their classifications. None
of them use the raw API, so for the moment it is only a placeholder.
ATOMIC CHAINS
-------------
arch/i386/kernel/traps.c: i386die_chain
arch/ia64/kernel/traps.c: ia64die_chain
arch/powerpc/kernel/traps.c: powerpc_die_chain
arch/sparc64/kernel/traps.c: sparc64die_chain
arch/x86_64/kernel/traps.c: die_chain
drivers/char/ipmi/ipmi_si_intf.c: xaction_notifier_list
kernel/panic.c: panic_notifier_list
kernel/profile.c: task_free_notifier
net/bluetooth/hci_core.c: hci_notifier
net/ipv4/netfilter/ip_conntrack_core.c: ip_conntrack_chain
net/ipv4/netfilter/ip_conntrack_core.c: ip_conntrack_expect_chain
net/ipv6/addrconf.c: inet6addr_chain
net/netfilter/nf_conntrack_core.c: nf_conntrack_chain
net/netfilter/nf_conntrack_core.c: nf_conntrack_expect_chain
net/netlink/af_netlink.c: netlink_chain
BLOCKING CHAINS
---------------
arch/powerpc/platforms/pseries/reconfig.c: pSeries_reconfig_chain
arch/s390/kernel/process.c: idle_chain
arch/x86_64/kernel/process.c idle_notifier
drivers/base/memory.c: memory_chain
drivers/cpufreq/cpufreq.c cpufreq_policy_notifier_list
drivers/cpufreq/cpufreq.c cpufreq_transition_notifier_list
drivers/macintosh/adb.c: adb_client_list
drivers/macintosh/via-pmu.c sleep_notifier_list
drivers/macintosh/via-pmu68k.c sleep_notifier_list
drivers/macintosh/windfarm_core.c wf_client_list
drivers/usb/core/notify.c usb_notifier_list
drivers/video/fbmem.c fb_notifier_list
kernel/cpu.c cpu_chain
kernel/module.c module_notify_list
kernel/profile.c munmap_notifier
kernel/profile.c task_exit_notifier
kernel/sys.c reboot_notifier_list
net/core/dev.c netdev_chain
net/decnet/dn_dev.c: dnaddr_chain
net/ipv4/devinet.c: inetaddr_chain
It's possible that some of these classifications are wrong. If they are,
please let us know or submit a patch to fix them. Note that any chain that
gets called very frequently should be atomic, because the rwsem read-locking
used for blocking chains is very likely to incur cache misses on SMP systems.
(However, if the chain's callout routines may sleep then the chain cannot be
atomic.)
The patch set was written by Alan Stern and Chandra Seetharaman, incorporating
material written by Keith Owens and suggestions from Paul McKenney and Andrew
Morton.
[jes@sgi.com: restructure the notifier chain initialization macros]
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Chandra Seetharaman <sekharan@us.ibm.com>
Signed-off-by: Jes Sorensen <jes@sgi.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-03-27 02:16:30 -07:00
|
|
|
static BLOCKING_NOTIFIER_HEAD(memory_chain);
|
2005-10-29 19:16:54 -06:00
|
|
|
|
2006-01-06 01:10:35 -07:00
|
|
|
int register_memory_notifier(struct notifier_block *nb)
|
2005-10-29 19:16:54 -06:00
|
|
|
{
|
[PATCH] Notifier chain update: API changes
The kernel's implementation of notifier chains is unsafe. There is no
protection against entries being added to or removed from a chain while the
chain is in use. The issues were discussed in this thread:
http://marc.theaimsgroup.com/?l=linux-kernel&m=113018709002036&w=2
We noticed that notifier chains in the kernel fall into two basic usage
classes:
"Blocking" chains are always called from a process context
and the callout routines are allowed to sleep;
"Atomic" chains can be called from an atomic context and
the callout routines are not allowed to sleep.
We decided to codify this distinction and make it part of the API. Therefore
this set of patches introduces three new, parallel APIs: one for blocking
notifiers, one for atomic notifiers, and one for "raw" notifiers (which is
really just the old API under a new name). New kinds of data structures are
used for the heads of the chains, and new routines are defined for
registration, unregistration, and calling a chain. The three APIs are
explained in include/linux/notifier.h and their implementation is in
kernel/sys.c.
With atomic and blocking chains, the implementation guarantees that the chain
links will not be corrupted and that chain callers will not get messed up by
entries being added or removed. For raw chains the implementation provides no
guarantees at all; users of this API must provide their own protections. (The
idea was that situations may come up where the assumptions of the atomic and
blocking APIs are not appropriate, so it should be possible for users to
handle these things in their own way.)
There are some limitations, which should not be too hard to live with. For
atomic/blocking chains, registration and unregistration must always be done in
a process context since the chain is protected by a mutex/rwsem. Also, a
callout routine for a non-raw chain must not try to register or unregister
entries on its own chain. (This did happen in a couple of places and the code
had to be changed to avoid it.)
Since atomic chains may be called from within an NMI handler, they cannot use
spinlocks for synchronization. Instead we use RCU. The overhead falls almost
entirely in the unregister routine, which is okay since unregistration is much
less frequent that calling a chain.
Here is the list of chains that we adjusted and their classifications. None
of them use the raw API, so for the moment it is only a placeholder.
ATOMIC CHAINS
-------------
arch/i386/kernel/traps.c: i386die_chain
arch/ia64/kernel/traps.c: ia64die_chain
arch/powerpc/kernel/traps.c: powerpc_die_chain
arch/sparc64/kernel/traps.c: sparc64die_chain
arch/x86_64/kernel/traps.c: die_chain
drivers/char/ipmi/ipmi_si_intf.c: xaction_notifier_list
kernel/panic.c: panic_notifier_list
kernel/profile.c: task_free_notifier
net/bluetooth/hci_core.c: hci_notifier
net/ipv4/netfilter/ip_conntrack_core.c: ip_conntrack_chain
net/ipv4/netfilter/ip_conntrack_core.c: ip_conntrack_expect_chain
net/ipv6/addrconf.c: inet6addr_chain
net/netfilter/nf_conntrack_core.c: nf_conntrack_chain
net/netfilter/nf_conntrack_core.c: nf_conntrack_expect_chain
net/netlink/af_netlink.c: netlink_chain
BLOCKING CHAINS
---------------
arch/powerpc/platforms/pseries/reconfig.c: pSeries_reconfig_chain
arch/s390/kernel/process.c: idle_chain
arch/x86_64/kernel/process.c idle_notifier
drivers/base/memory.c: memory_chain
drivers/cpufreq/cpufreq.c cpufreq_policy_notifier_list
drivers/cpufreq/cpufreq.c cpufreq_transition_notifier_list
drivers/macintosh/adb.c: adb_client_list
drivers/macintosh/via-pmu.c sleep_notifier_list
drivers/macintosh/via-pmu68k.c sleep_notifier_list
drivers/macintosh/windfarm_core.c wf_client_list
drivers/usb/core/notify.c usb_notifier_list
drivers/video/fbmem.c fb_notifier_list
kernel/cpu.c cpu_chain
kernel/module.c module_notify_list
kernel/profile.c munmap_notifier
kernel/profile.c task_exit_notifier
kernel/sys.c reboot_notifier_list
net/core/dev.c netdev_chain
net/decnet/dn_dev.c: dnaddr_chain
net/ipv4/devinet.c: inetaddr_chain
It's possible that some of these classifications are wrong. If they are,
please let us know or submit a patch to fix them. Note that any chain that
gets called very frequently should be atomic, because the rwsem read-locking
used for blocking chains is very likely to incur cache misses on SMP systems.
(However, if the chain's callout routines may sleep then the chain cannot be
atomic.)
The patch set was written by Alan Stern and Chandra Seetharaman, incorporating
material written by Keith Owens and suggestions from Paul McKenney and Andrew
Morton.
[jes@sgi.com: restructure the notifier chain initialization macros]
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Chandra Seetharaman <sekharan@us.ibm.com>
Signed-off-by: Jes Sorensen <jes@sgi.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-03-27 02:16:30 -07:00
|
|
|
return blocking_notifier_chain_register(&memory_chain, nb);
|
2005-10-29 19:16:54 -06:00
|
|
|
}
|
2008-05-07 06:43:01 -06:00
|
|
|
EXPORT_SYMBOL(register_memory_notifier);
|
2005-10-29 19:16:54 -06:00
|
|
|
|
2006-01-06 01:10:35 -07:00
|
|
|
void unregister_memory_notifier(struct notifier_block *nb)
|
2005-10-29 19:16:54 -06:00
|
|
|
{
|
[PATCH] Notifier chain update: API changes
The kernel's implementation of notifier chains is unsafe. There is no
protection against entries being added to or removed from a chain while the
chain is in use. The issues were discussed in this thread:
http://marc.theaimsgroup.com/?l=linux-kernel&m=113018709002036&w=2
We noticed that notifier chains in the kernel fall into two basic usage
classes:
"Blocking" chains are always called from a process context
and the callout routines are allowed to sleep;
"Atomic" chains can be called from an atomic context and
the callout routines are not allowed to sleep.
We decided to codify this distinction and make it part of the API. Therefore
this set of patches introduces three new, parallel APIs: one for blocking
notifiers, one for atomic notifiers, and one for "raw" notifiers (which is
really just the old API under a new name). New kinds of data structures are
used for the heads of the chains, and new routines are defined for
registration, unregistration, and calling a chain. The three APIs are
explained in include/linux/notifier.h and their implementation is in
kernel/sys.c.
With atomic and blocking chains, the implementation guarantees that the chain
links will not be corrupted and that chain callers will not get messed up by
entries being added or removed. For raw chains the implementation provides no
guarantees at all; users of this API must provide their own protections. (The
idea was that situations may come up where the assumptions of the atomic and
blocking APIs are not appropriate, so it should be possible for users to
handle these things in their own way.)
There are some limitations, which should not be too hard to live with. For
atomic/blocking chains, registration and unregistration must always be done in
a process context since the chain is protected by a mutex/rwsem. Also, a
callout routine for a non-raw chain must not try to register or unregister
entries on its own chain. (This did happen in a couple of places and the code
had to be changed to avoid it.)
Since atomic chains may be called from within an NMI handler, they cannot use
spinlocks for synchronization. Instead we use RCU. The overhead falls almost
entirely in the unregister routine, which is okay since unregistration is much
less frequent that calling a chain.
Here is the list of chains that we adjusted and their classifications. None
of them use the raw API, so for the moment it is only a placeholder.
ATOMIC CHAINS
-------------
arch/i386/kernel/traps.c: i386die_chain
arch/ia64/kernel/traps.c: ia64die_chain
arch/powerpc/kernel/traps.c: powerpc_die_chain
arch/sparc64/kernel/traps.c: sparc64die_chain
arch/x86_64/kernel/traps.c: die_chain
drivers/char/ipmi/ipmi_si_intf.c: xaction_notifier_list
kernel/panic.c: panic_notifier_list
kernel/profile.c: task_free_notifier
net/bluetooth/hci_core.c: hci_notifier
net/ipv4/netfilter/ip_conntrack_core.c: ip_conntrack_chain
net/ipv4/netfilter/ip_conntrack_core.c: ip_conntrack_expect_chain
net/ipv6/addrconf.c: inet6addr_chain
net/netfilter/nf_conntrack_core.c: nf_conntrack_chain
net/netfilter/nf_conntrack_core.c: nf_conntrack_expect_chain
net/netlink/af_netlink.c: netlink_chain
BLOCKING CHAINS
---------------
arch/powerpc/platforms/pseries/reconfig.c: pSeries_reconfig_chain
arch/s390/kernel/process.c: idle_chain
arch/x86_64/kernel/process.c idle_notifier
drivers/base/memory.c: memory_chain
drivers/cpufreq/cpufreq.c cpufreq_policy_notifier_list
drivers/cpufreq/cpufreq.c cpufreq_transition_notifier_list
drivers/macintosh/adb.c: adb_client_list
drivers/macintosh/via-pmu.c sleep_notifier_list
drivers/macintosh/via-pmu68k.c sleep_notifier_list
drivers/macintosh/windfarm_core.c wf_client_list
drivers/usb/core/notify.c usb_notifier_list
drivers/video/fbmem.c fb_notifier_list
kernel/cpu.c cpu_chain
kernel/module.c module_notify_list
kernel/profile.c munmap_notifier
kernel/profile.c task_exit_notifier
kernel/sys.c reboot_notifier_list
net/core/dev.c netdev_chain
net/decnet/dn_dev.c: dnaddr_chain
net/ipv4/devinet.c: inetaddr_chain
It's possible that some of these classifications are wrong. If they are,
please let us know or submit a patch to fix them. Note that any chain that
gets called very frequently should be atomic, because the rwsem read-locking
used for blocking chains is very likely to incur cache misses on SMP systems.
(However, if the chain's callout routines may sleep then the chain cannot be
atomic.)
The patch set was written by Alan Stern and Chandra Seetharaman, incorporating
material written by Keith Owens and suggestions from Paul McKenney and Andrew
Morton.
[jes@sgi.com: restructure the notifier chain initialization macros]
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Chandra Seetharaman <sekharan@us.ibm.com>
Signed-off-by: Jes Sorensen <jes@sgi.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-03-27 02:16:30 -07:00
|
|
|
blocking_notifier_chain_unregister(&memory_chain, nb);
|
2005-10-29 19:16:54 -06:00
|
|
|
}
|
2008-05-07 06:43:01 -06:00
|
|
|
EXPORT_SYMBOL(unregister_memory_notifier);
|
2005-10-29 19:16:54 -06:00
|
|
|
|
2009-12-17 07:44:38 -07:00
|
|
|
static ATOMIC_NOTIFIER_HEAD(memory_isolate_chain);
|
|
|
|
|
|
|
|
int register_memory_isolate_notifier(struct notifier_block *nb)
|
|
|
|
{
|
|
|
|
return atomic_notifier_chain_register(&memory_isolate_chain, nb);
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL(register_memory_isolate_notifier);
|
|
|
|
|
|
|
|
void unregister_memory_isolate_notifier(struct notifier_block *nb)
|
|
|
|
{
|
|
|
|
atomic_notifier_chain_unregister(&memory_isolate_chain, nb);
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL(unregister_memory_isolate_notifier);
|
|
|
|
|
2005-10-29 19:16:54 -06:00
|
|
|
/*
|
|
|
|
* register_memory - Setup a sysfs device for a memory block
|
|
|
|
*/
|
2008-02-11 10:23:18 -07:00
|
|
|
static
|
|
|
|
int register_memory(struct memory_block *memory, struct mem_section *section)
|
2005-10-29 19:16:54 -06:00
|
|
|
{
|
|
|
|
int error;
|
|
|
|
|
|
|
|
memory->sysdev.cls = &memory_sysdev_class;
|
|
|
|
memory->sysdev.id = __section_nr(section);
|
|
|
|
|
|
|
|
error = sysdev_register(&memory->sysdev);
|
|
|
|
return error;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void
|
2008-02-11 10:23:18 -07:00
|
|
|
unregister_memory(struct memory_block *memory, struct mem_section *section)
|
2005-10-29 19:16:54 -06:00
|
|
|
{
|
|
|
|
BUG_ON(memory->sysdev.cls != &memory_sysdev_class);
|
|
|
|
BUG_ON(memory->sysdev.id != __section_nr(section));
|
|
|
|
|
2008-02-11 10:23:18 -07:00
|
|
|
/* drop the ref. we got in remove_memory_block() */
|
|
|
|
kobject_put(&memory->sysdev.kobj);
|
2005-10-29 19:16:54 -06:00
|
|
|
sysdev_unregister(&memory->sysdev);
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* use this as the physical section index that this memsection
|
|
|
|
* uses.
|
|
|
|
*/
|
|
|
|
|
2008-07-01 10:48:41 -06:00
|
|
|
static ssize_t show_mem_phys_index(struct sys_device *dev,
|
|
|
|
struct sysdev_attribute *attr, char *buf)
|
2005-10-29 19:16:54 -06:00
|
|
|
{
|
|
|
|
struct memory_block *mem =
|
|
|
|
container_of(dev, struct memory_block, sysdev);
|
|
|
|
return sprintf(buf, "%08lx\n", mem->phys_index);
|
|
|
|
}
|
|
|
|
|
2008-07-23 22:28:19 -06:00
|
|
|
/*
|
|
|
|
* Show whether the section of memory is likely to be hot-removable
|
|
|
|
*/
|
2008-07-27 19:05:04 -06:00
|
|
|
static ssize_t show_mem_removable(struct sys_device *dev,
|
|
|
|
struct sysdev_attribute *attr, char *buf)
|
2008-07-23 22:28:19 -06:00
|
|
|
{
|
|
|
|
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);
|
|
|
|
}
|
|
|
|
|
2005-10-29 19:16:54 -06:00
|
|
|
/*
|
|
|
|
* online, offline, going offline, etc.
|
|
|
|
*/
|
2008-07-01 10:48:41 -06:00
|
|
|
static ssize_t show_mem_state(struct sys_device *dev,
|
|
|
|
struct sysdev_attribute *attr, char *buf)
|
2005-10-29 19:16:54 -06:00
|
|
|
{
|
|
|
|
struct memory_block *mem =
|
|
|
|
container_of(dev, struct memory_block, sysdev);
|
|
|
|
ssize_t len = 0;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* We can probably put these states in a nice little array
|
|
|
|
* so that they're not open-coded
|
|
|
|
*/
|
|
|
|
switch (mem->state) {
|
|
|
|
case MEM_ONLINE:
|
|
|
|
len = sprintf(buf, "online\n");
|
|
|
|
break;
|
|
|
|
case MEM_OFFLINE:
|
|
|
|
len = sprintf(buf, "offline\n");
|
|
|
|
break;
|
|
|
|
case MEM_GOING_OFFLINE:
|
|
|
|
len = sprintf(buf, "going-offline\n");
|
|
|
|
break;
|
|
|
|
default:
|
|
|
|
len = sprintf(buf, "ERROR-UNKNOWN-%ld\n",
|
|
|
|
mem->state);
|
|
|
|
WARN_ON(1);
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
return len;
|
|
|
|
}
|
|
|
|
|
2007-10-21 17:41:36 -06:00
|
|
|
int memory_notify(unsigned long val, void *v)
|
2005-10-29 19:16:54 -06:00
|
|
|
{
|
[PATCH] Notifier chain update: API changes
The kernel's implementation of notifier chains is unsafe. There is no
protection against entries being added to or removed from a chain while the
chain is in use. The issues were discussed in this thread:
http://marc.theaimsgroup.com/?l=linux-kernel&m=113018709002036&w=2
We noticed that notifier chains in the kernel fall into two basic usage
classes:
"Blocking" chains are always called from a process context
and the callout routines are allowed to sleep;
"Atomic" chains can be called from an atomic context and
the callout routines are not allowed to sleep.
We decided to codify this distinction and make it part of the API. Therefore
this set of patches introduces three new, parallel APIs: one for blocking
notifiers, one for atomic notifiers, and one for "raw" notifiers (which is
really just the old API under a new name). New kinds of data structures are
used for the heads of the chains, and new routines are defined for
registration, unregistration, and calling a chain. The three APIs are
explained in include/linux/notifier.h and their implementation is in
kernel/sys.c.
With atomic and blocking chains, the implementation guarantees that the chain
links will not be corrupted and that chain callers will not get messed up by
entries being added or removed. For raw chains the implementation provides no
guarantees at all; users of this API must provide their own protections. (The
idea was that situations may come up where the assumptions of the atomic and
blocking APIs are not appropriate, so it should be possible for users to
handle these things in their own way.)
There are some limitations, which should not be too hard to live with. For
atomic/blocking chains, registration and unregistration must always be done in
a process context since the chain is protected by a mutex/rwsem. Also, a
callout routine for a non-raw chain must not try to register or unregister
entries on its own chain. (This did happen in a couple of places and the code
had to be changed to avoid it.)
Since atomic chains may be called from within an NMI handler, they cannot use
spinlocks for synchronization. Instead we use RCU. The overhead falls almost
entirely in the unregister routine, which is okay since unregistration is much
less frequent that calling a chain.
Here is the list of chains that we adjusted and their classifications. None
of them use the raw API, so for the moment it is only a placeholder.
ATOMIC CHAINS
-------------
arch/i386/kernel/traps.c: i386die_chain
arch/ia64/kernel/traps.c: ia64die_chain
arch/powerpc/kernel/traps.c: powerpc_die_chain
arch/sparc64/kernel/traps.c: sparc64die_chain
arch/x86_64/kernel/traps.c: die_chain
drivers/char/ipmi/ipmi_si_intf.c: xaction_notifier_list
kernel/panic.c: panic_notifier_list
kernel/profile.c: task_free_notifier
net/bluetooth/hci_core.c: hci_notifier
net/ipv4/netfilter/ip_conntrack_core.c: ip_conntrack_chain
net/ipv4/netfilter/ip_conntrack_core.c: ip_conntrack_expect_chain
net/ipv6/addrconf.c: inet6addr_chain
net/netfilter/nf_conntrack_core.c: nf_conntrack_chain
net/netfilter/nf_conntrack_core.c: nf_conntrack_expect_chain
net/netlink/af_netlink.c: netlink_chain
BLOCKING CHAINS
---------------
arch/powerpc/platforms/pseries/reconfig.c: pSeries_reconfig_chain
arch/s390/kernel/process.c: idle_chain
arch/x86_64/kernel/process.c idle_notifier
drivers/base/memory.c: memory_chain
drivers/cpufreq/cpufreq.c cpufreq_policy_notifier_list
drivers/cpufreq/cpufreq.c cpufreq_transition_notifier_list
drivers/macintosh/adb.c: adb_client_list
drivers/macintosh/via-pmu.c sleep_notifier_list
drivers/macintosh/via-pmu68k.c sleep_notifier_list
drivers/macintosh/windfarm_core.c wf_client_list
drivers/usb/core/notify.c usb_notifier_list
drivers/video/fbmem.c fb_notifier_list
kernel/cpu.c cpu_chain
kernel/module.c module_notify_list
kernel/profile.c munmap_notifier
kernel/profile.c task_exit_notifier
kernel/sys.c reboot_notifier_list
net/core/dev.c netdev_chain
net/decnet/dn_dev.c: dnaddr_chain
net/ipv4/devinet.c: inetaddr_chain
It's possible that some of these classifications are wrong. If they are,
please let us know or submit a patch to fix them. Note that any chain that
gets called very frequently should be atomic, because the rwsem read-locking
used for blocking chains is very likely to incur cache misses on SMP systems.
(However, if the chain's callout routines may sleep then the chain cannot be
atomic.)
The patch set was written by Alan Stern and Chandra Seetharaman, incorporating
material written by Keith Owens and suggestions from Paul McKenney and Andrew
Morton.
[jes@sgi.com: restructure the notifier chain initialization macros]
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Chandra Seetharaman <sekharan@us.ibm.com>
Signed-off-by: Jes Sorensen <jes@sgi.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-03-27 02:16:30 -07:00
|
|
|
return blocking_notifier_call_chain(&memory_chain, val, v);
|
2005-10-29 19:16:54 -06:00
|
|
|
}
|
|
|
|
|
2009-12-17 07:44:38 -07:00
|
|
|
int memory_isolate_notify(unsigned long val, void *v)
|
|
|
|
{
|
|
|
|
return atomic_notifier_call_chain(&memory_isolate_chain, val, v);
|
|
|
|
}
|
|
|
|
|
2005-10-29 19:16:54 -06:00
|
|
|
/*
|
|
|
|
* MEMORY_HOTPLUG depends on SPARSEMEM in mm/Kconfig, so it is
|
|
|
|
* OK to have direct references to sparsemem variables in here.
|
|
|
|
*/
|
|
|
|
static int
|
|
|
|
memory_block_action(struct memory_block *mem, 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);
|
|
|
|
|
|
|
|
/*
|
|
|
|
* The probe routines leave the pages reserved, just
|
|
|
|
* as the bootmem code does. Make sure they're still
|
|
|
|
* that way.
|
|
|
|
*/
|
|
|
|
if (action == MEM_ONLINE) {
|
|
|
|
for (i = 0; i < PAGES_PER_SECTION; i++) {
|
|
|
|
if (PageReserved(first_page+i))
|
|
|
|
continue;
|
|
|
|
|
|
|
|
printk(KERN_WARNING "section number %ld page number %d "
|
|
|
|
"not reserved, was it already online? \n",
|
|
|
|
psection, i);
|
|
|
|
return -EBUSY;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
switch (action) {
|
|
|
|
case MEM_ONLINE:
|
|
|
|
start_pfn = page_to_pfn(first_page);
|
|
|
|
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:
|
2008-07-25 20:45:39 -06:00
|
|
|
WARN(1, KERN_WARNING "%s(%p, %ld) unknown action: %ld\n",
|
2008-03-04 17:41:05 -07:00
|
|
|
__func__, mem, action, action);
|
2005-10-29 19:16:54 -06:00
|
|
|
ret = -EINVAL;
|
|
|
|
}
|
|
|
|
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int memory_block_change_state(struct memory_block *mem,
|
|
|
|
unsigned long to_state, unsigned long from_state_req)
|
|
|
|
{
|
|
|
|
int ret = 0;
|
2008-02-05 00:35:47 -07:00
|
|
|
mutex_lock(&mem->state_mutex);
|
2005-10-29 19:16:54 -06:00
|
|
|
|
|
|
|
if (mem->state != from_state_req) {
|
|
|
|
ret = -EINVAL;
|
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
|
|
|
|
ret = memory_block_action(mem, to_state);
|
|
|
|
if (!ret)
|
|
|
|
mem->state = to_state;
|
|
|
|
|
|
|
|
out:
|
2008-02-05 00:35:47 -07:00
|
|
|
mutex_unlock(&mem->state_mutex);
|
2005-10-29 19:16:54 -06:00
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
static ssize_t
|
2008-07-01 10:48:41 -06:00
|
|
|
store_mem_state(struct sys_device *dev,
|
|
|
|
struct sysdev_attribute *attr, const char *buf, size_t count)
|
2005-10-29 19:16:54 -06:00
|
|
|
{
|
|
|
|
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;
|
|
|
|
|
2007-10-16 02:24:11 -06:00
|
|
|
if (!present_section_nr(phys_section_nr))
|
2005-10-29 19:16:54 -06:00
|
|
|
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;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* phys_device is a bad name for this. What I really want
|
|
|
|
* is a way to differentiate between memory ranges that
|
|
|
|
* are part of physical devices that constitute
|
|
|
|
* a complete removable unit or fru.
|
|
|
|
* i.e. do these ranges belong to the same physical device,
|
|
|
|
* s.t. if I offline all of these sections I can then
|
|
|
|
* remove the physical device?
|
|
|
|
*/
|
2008-07-01 10:48:41 -06:00
|
|
|
static ssize_t show_phys_device(struct sys_device *dev,
|
|
|
|
struct sysdev_attribute *attr, char *buf)
|
2005-10-29 19:16:54 -06:00
|
|
|
{
|
|
|
|
struct memory_block *mem =
|
|
|
|
container_of(dev, struct memory_block, sysdev);
|
|
|
|
return sprintf(buf, "%d\n", mem->phys_device);
|
|
|
|
}
|
|
|
|
|
|
|
|
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);
|
2008-07-23 22:28:19 -06:00
|
|
|
static SYSDEV_ATTR(removable, 0444, show_mem_removable, NULL);
|
2005-10-29 19:16:54 -06:00
|
|
|
|
|
|
|
#define mem_create_simple_file(mem, attr_name) \
|
|
|
|
sysdev_create_file(&mem->sysdev, &attr_##attr_name)
|
|
|
|
#define mem_remove_simple_file(mem, attr_name) \
|
|
|
|
sysdev_remove_file(&mem->sysdev, &attr_##attr_name)
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Block size attribute stuff
|
|
|
|
*/
|
|
|
|
static ssize_t
|
2010-01-05 04:48:06 -07:00
|
|
|
print_block_size(struct sysdev_class *class, struct sysdev_class_attribute *attr,
|
|
|
|
char *buf)
|
2005-10-29 19:16:54 -06:00
|
|
|
{
|
2010-01-15 18:01:31 -07:00
|
|
|
return sprintf(buf, "%#lx\n", (unsigned long)PAGES_PER_SECTION * PAGE_SIZE);
|
2005-10-29 19:16:54 -06:00
|
|
|
}
|
|
|
|
|
2010-01-05 04:48:06 -07:00
|
|
|
static SYSDEV_CLASS_ATTR(block_size_bytes, 0444, print_block_size, NULL);
|
2005-10-29 19:16:54 -06:00
|
|
|
|
|
|
|
static int block_size_init(void)
|
|
|
|
{
|
2006-12-06 21:37:29 -07:00
|
|
|
return sysfs_create_file(&memory_sysdev_class.kset.kobj,
|
2010-01-05 04:48:06 -07:00
|
|
|
&attr_block_size_bytes.attr);
|
2005-10-29 19:16:54 -06:00
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Some architectures will have custom drivers to do this, and
|
|
|
|
* will not need to do it from userspace. The fake hot-add code
|
|
|
|
* as well as ppc64 will do all of their discovery in userspace
|
|
|
|
* and will require this interface.
|
|
|
|
*/
|
|
|
|
#ifdef CONFIG_ARCH_MEMORY_PROBE
|
|
|
|
static ssize_t
|
2010-01-19 14:08:16 -07:00
|
|
|
memory_probe_store(struct class *class, const char *buf, size_t count)
|
2005-10-29 19:16:54 -06:00
|
|
|
{
|
|
|
|
u64 phys_addr;
|
2006-06-27 03:53:30 -06:00
|
|
|
int nid;
|
2005-10-29 19:16:54 -06:00
|
|
|
int ret;
|
|
|
|
|
|
|
|
phys_addr = simple_strtoull(buf, NULL, 0);
|
|
|
|
|
2006-06-27 03:53:30 -06:00
|
|
|
nid = memory_add_physaddr_to_nid(phys_addr);
|
|
|
|
ret = add_memory(nid, phys_addr, PAGES_PER_SECTION << PAGE_SHIFT);
|
2005-10-29 19:16:54 -06:00
|
|
|
|
|
|
|
if (ret)
|
|
|
|
count = ret;
|
|
|
|
|
|
|
|
return count;
|
|
|
|
}
|
2010-01-19 14:08:16 -07:00
|
|
|
static CLASS_ATTR(probe, S_IWUSR, NULL, memory_probe_store);
|
2005-10-29 19:16:54 -06:00
|
|
|
|
|
|
|
static int memory_probe_init(void)
|
|
|
|
{
|
2006-12-06 21:37:29 -07:00
|
|
|
return sysfs_create_file(&memory_sysdev_class.kset.kobj,
|
2010-01-19 14:08:16 -07:00
|
|
|
&class_attr_probe.attr);
|
2005-10-29 19:16:54 -06:00
|
|
|
}
|
|
|
|
#else
|
2006-12-06 21:37:29 -07:00
|
|
|
static inline int memory_probe_init(void)
|
|
|
|
{
|
|
|
|
return 0;
|
|
|
|
}
|
2005-10-29 19:16:54 -06:00
|
|
|
#endif
|
|
|
|
|
2009-12-16 04:20:00 -07:00
|
|
|
#ifdef CONFIG_MEMORY_FAILURE
|
|
|
|
/*
|
|
|
|
* Support for offlining pages of memory
|
|
|
|
*/
|
|
|
|
|
|
|
|
/* Soft offline a page */
|
|
|
|
static ssize_t
|
2010-01-19 14:08:16 -07:00
|
|
|
store_soft_offline_page(struct class *class, const char *buf, size_t count)
|
2009-12-16 04:20:00 -07:00
|
|
|
{
|
|
|
|
int ret;
|
|
|
|
u64 pfn;
|
|
|
|
if (!capable(CAP_SYS_ADMIN))
|
|
|
|
return -EPERM;
|
|
|
|
if (strict_strtoull(buf, 0, &pfn) < 0)
|
|
|
|
return -EINVAL;
|
|
|
|
pfn >>= PAGE_SHIFT;
|
|
|
|
if (!pfn_valid(pfn))
|
|
|
|
return -ENXIO;
|
|
|
|
ret = soft_offline_page(pfn_to_page(pfn), 0);
|
|
|
|
return ret == 0 ? count : ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Forcibly offline a page, including killing processes. */
|
|
|
|
static ssize_t
|
2010-01-19 14:08:16 -07:00
|
|
|
store_hard_offline_page(struct class *class, const char *buf, size_t count)
|
2009-12-16 04:20:00 -07:00
|
|
|
{
|
|
|
|
int ret;
|
|
|
|
u64 pfn;
|
|
|
|
if (!capable(CAP_SYS_ADMIN))
|
|
|
|
return -EPERM;
|
|
|
|
if (strict_strtoull(buf, 0, &pfn) < 0)
|
|
|
|
return -EINVAL;
|
|
|
|
pfn >>= PAGE_SHIFT;
|
|
|
|
ret = __memory_failure(pfn, 0, 0);
|
|
|
|
return ret ? ret : count;
|
|
|
|
}
|
|
|
|
|
2010-01-19 14:08:16 -07:00
|
|
|
static CLASS_ATTR(soft_offline_page, 0644, NULL, store_soft_offline_page);
|
|
|
|
static CLASS_ATTR(hard_offline_page, 0644, NULL, store_hard_offline_page);
|
2009-12-16 04:20:00 -07:00
|
|
|
|
|
|
|
static __init int memory_fail_init(void)
|
|
|
|
{
|
|
|
|
int err;
|
|
|
|
|
|
|
|
err = sysfs_create_file(&memory_sysdev_class.kset.kobj,
|
2010-01-19 14:08:16 -07:00
|
|
|
&class_attr_soft_offline_page.attr);
|
2009-12-16 04:20:00 -07:00
|
|
|
if (!err)
|
|
|
|
err = sysfs_create_file(&memory_sysdev_class.kset.kobj,
|
2010-01-19 14:08:16 -07:00
|
|
|
&class_attr_hard_offline_page.attr);
|
2009-12-16 04:20:00 -07:00
|
|
|
return err;
|
|
|
|
}
|
|
|
|
#else
|
|
|
|
static inline int memory_fail_init(void)
|
|
|
|
{
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
|
2005-10-29 19:16:54 -06:00
|
|
|
/*
|
|
|
|
* Note that phys_device is optional. It is here to allow for
|
|
|
|
* differentiation between which *physical* devices each
|
|
|
|
* section belongs to...
|
|
|
|
*/
|
|
|
|
|
2009-01-06 15:39:14 -07:00
|
|
|
static int add_memory_block(int nid, struct mem_section *section,
|
|
|
|
unsigned long state, int phys_device,
|
|
|
|
enum mem_add_context context)
|
2005-10-29 19:16:54 -06:00
|
|
|
{
|
2005-10-29 19:16:55 -06:00
|
|
|
struct memory_block *mem = kzalloc(sizeof(*mem), GFP_KERNEL);
|
2005-10-29 19:16:54 -06:00
|
|
|
int ret = 0;
|
|
|
|
|
|
|
|
if (!mem)
|
|
|
|
return -ENOMEM;
|
|
|
|
|
|
|
|
mem->phys_index = __section_nr(section);
|
|
|
|
mem->state = state;
|
2008-02-05 00:35:47 -07:00
|
|
|
mutex_init(&mem->state_mutex);
|
2005-10-29 19:16:54 -06:00
|
|
|
mem->phys_device = phys_device;
|
|
|
|
|
2008-02-11 10:23:18 -07:00
|
|
|
ret = register_memory(mem, section);
|
2005-10-29 19:16:54 -06:00
|
|
|
if (!ret)
|
|
|
|
ret = mem_create_simple_file(mem, phys_index);
|
|
|
|
if (!ret)
|
|
|
|
ret = mem_create_simple_file(mem, state);
|
|
|
|
if (!ret)
|
|
|
|
ret = mem_create_simple_file(mem, phys_device);
|
2008-07-23 22:28:19 -06:00
|
|
|
if (!ret)
|
|
|
|
ret = mem_create_simple_file(mem, removable);
|
2009-01-06 15:39:14 -07:00
|
|
|
if (!ret) {
|
|
|
|
if (context == HOTPLUG)
|
|
|
|
ret = register_mem_sect_under_node(mem, nid);
|
|
|
|
}
|
2005-10-29 19:16:54 -06:00
|
|
|
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* For now, we have a linear search to go find the appropriate
|
|
|
|
* memory_block corresponding to a particular phys_index. If
|
|
|
|
* this gets to be a real problem, we can always use a radix
|
|
|
|
* tree or something here.
|
|
|
|
*
|
|
|
|
* This could be made generic for all sysdev classes.
|
|
|
|
*/
|
2009-01-06 15:39:14 -07:00
|
|
|
struct memory_block *find_memory_block(struct mem_section *section)
|
2005-10-29 19:16:54 -06:00
|
|
|
{
|
|
|
|
struct kobject *kobj;
|
|
|
|
struct sys_device *sysdev;
|
|
|
|
struct memory_block *mem;
|
|
|
|
char name[sizeof(MEMORY_CLASS_NAME) + 9 + 1];
|
|
|
|
|
|
|
|
/*
|
|
|
|
* 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));
|
|
|
|
|
|
|
|
kobj = kset_find_obj(&memory_sysdev_class.kset, name);
|
|
|
|
if (!kobj)
|
|
|
|
return NULL;
|
|
|
|
|
|
|
|
sysdev = container_of(kobj, struct sys_device, kobj);
|
|
|
|
mem = container_of(sysdev, struct memory_block, sysdev);
|
|
|
|
|
|
|
|
return mem;
|
|
|
|
}
|
|
|
|
|
|
|
|
int remove_memory_block(unsigned long node_id, struct mem_section *section,
|
|
|
|
int phys_device)
|
|
|
|
{
|
|
|
|
struct memory_block *mem;
|
|
|
|
|
|
|
|
mem = find_memory_block(section);
|
2009-01-06 15:39:14 -07:00
|
|
|
unregister_mem_sect_under_nodes(mem);
|
2005-10-29 19:16:54 -06:00
|
|
|
mem_remove_simple_file(mem, phys_index);
|
|
|
|
mem_remove_simple_file(mem, state);
|
|
|
|
mem_remove_simple_file(mem, phys_device);
|
2008-07-23 22:28:19 -06:00
|
|
|
mem_remove_simple_file(mem, removable);
|
2008-02-11 10:23:18 -07:00
|
|
|
unregister_memory(mem, section);
|
2005-10-29 19:16:54 -06:00
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* need an interface for the VM to add new memory regions,
|
|
|
|
* but without onlining it.
|
|
|
|
*/
|
2009-01-06 15:39:14 -07:00
|
|
|
int register_new_memory(int nid, struct mem_section *section)
|
2005-10-29 19:16:54 -06:00
|
|
|
{
|
2009-01-06 15:39:14 -07:00
|
|
|
return add_memory_block(nid, section, MEM_OFFLINE, 0, HOTPLUG);
|
2005-10-29 19:16:54 -06:00
|
|
|
}
|
|
|
|
|
|
|
|
int unregister_memory_section(struct mem_section *section)
|
|
|
|
{
|
2007-10-16 02:24:11 -06:00
|
|
|
if (!present_section(section))
|
2005-10-29 19:16:54 -06:00
|
|
|
return -EINVAL;
|
|
|
|
|
|
|
|
return remove_memory_block(0, section, 0);
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Initialize the sysfs support for memory devices...
|
|
|
|
*/
|
|
|
|
int __init memory_dev_init(void)
|
|
|
|
{
|
|
|
|
unsigned int i;
|
|
|
|
int ret;
|
2006-12-06 21:37:29 -07:00
|
|
|
int err;
|
2005-10-29 19:16:54 -06:00
|
|
|
|
2005-11-16 01:00:00 -07:00
|
|
|
memory_sysdev_class.kset.uevent_ops = &memory_uevent_ops;
|
2005-10-29 19:16:54 -06:00
|
|
|
ret = sysdev_class_register(&memory_sysdev_class);
|
2006-12-06 21:37:29 -07:00
|
|
|
if (ret)
|
|
|
|
goto out;
|
2005-10-29 19:16:54 -06:00
|
|
|
|
|
|
|
/*
|
|
|
|
* Create entries for memory sections that were found
|
|
|
|
* during boot and have been initialized
|
|
|
|
*/
|
|
|
|
for (i = 0; i < NR_MEM_SECTIONS; i++) {
|
2007-10-16 02:24:11 -06:00
|
|
|
if (!present_section_nr(i))
|
2005-10-29 19:16:54 -06:00
|
|
|
continue;
|
2009-01-06 15:39:14 -07:00
|
|
|
err = add_memory_block(0, __nr_to_section(i), MEM_ONLINE,
|
|
|
|
0, BOOT);
|
2006-12-06 21:37:29 -07:00
|
|
|
if (!ret)
|
|
|
|
ret = err;
|
2005-10-29 19:16:54 -06:00
|
|
|
}
|
|
|
|
|
2006-12-06 21:37:29 -07:00
|
|
|
err = memory_probe_init();
|
2009-12-16 04:20:00 -07:00
|
|
|
if (!ret)
|
|
|
|
ret = err;
|
|
|
|
err = memory_fail_init();
|
2006-12-06 21:37:29 -07:00
|
|
|
if (!ret)
|
|
|
|
ret = err;
|
|
|
|
err = block_size_init();
|
|
|
|
if (!ret)
|
|
|
|
ret = err;
|
|
|
|
out:
|
|
|
|
if (ret)
|
2008-03-04 17:41:05 -07:00
|
|
|
printk(KERN_ERR "%s() failed: %d\n", __func__, ret);
|
2005-10-29 19:16:54 -06:00
|
|
|
return ret;
|
|
|
|
}
|