2005-04-17 06:20:36 +08:00
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/*
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* pSeries_reconfig.c - support for dynamic reconfiguration (including PCI
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* Hotplug and Dynamic Logical Partitioning on RPA platforms).
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*
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* Copyright (C) 2005 Nathan Lynch
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* Copyright (C) 2005 IBM Corporation
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*
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License version
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* 2 as published by the Free Software Foundation.
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*/
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#include <linux/kernel.h>
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#include <linux/kref.h>
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#include <linux/notifier.h>
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#include <linux/proc_fs.h>
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#include <asm/prom.h>
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2006-03-28 20:15:54 +08:00
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#include <asm/machdep.h>
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2005-04-17 06:20:36 +08:00
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#include <asm/uaccess.h>
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2006-03-28 20:15:54 +08:00
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#include <asm/pSeries_reconfig.h>
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2005-04-17 06:20:36 +08:00
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/*
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* Routines for "runtime" addition and removal of device tree nodes.
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*/
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#ifdef CONFIG_PROC_DEVICETREE
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/*
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* Add a node to /proc/device-tree.
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*/
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static void add_node_proc_entries(struct device_node *np)
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{
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struct proc_dir_entry *ent;
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ent = proc_mkdir(strrchr(np->full_name, '/') + 1, np->parent->pde);
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if (ent)
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proc_device_tree_add_node(np, ent);
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}
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static void remove_node_proc_entries(struct device_node *np)
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{
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struct property *pp = np->properties;
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struct device_node *parent = np->parent;
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while (pp) {
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remove_proc_entry(pp->name, np->pde);
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pp = pp->next;
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}
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if (np->pde)
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remove_proc_entry(np->pde->name, parent->pde);
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}
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#else /* !CONFIG_PROC_DEVICETREE */
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static void add_node_proc_entries(struct device_node *np)
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{
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return;
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}
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static void remove_node_proc_entries(struct device_node *np)
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{
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return;
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}
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#endif /* CONFIG_PROC_DEVICETREE */
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/**
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* derive_parent - basically like dirname(1)
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* @path: the full_name of a node to be added to the tree
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*
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* Returns the node which should be the parent of the node
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* described by path. E.g., for path = "/foo/bar", returns
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* the node with full_name = "/foo".
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*/
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static struct device_node *derive_parent(const char *path)
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{
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struct device_node *parent = NULL;
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char *parent_path = "/";
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size_t parent_path_len = strrchr(path, '/') - path + 1;
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/* reject if path is "/" */
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if (!strcmp(path, "/"))
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return ERR_PTR(-EINVAL);
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if (strrchr(path, '/') != path) {
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parent_path = kmalloc(parent_path_len, GFP_KERNEL);
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if (!parent_path)
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return ERR_PTR(-ENOMEM);
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strlcpy(parent_path, path, parent_path_len);
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}
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parent = of_find_node_by_path(parent_path);
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if (!parent)
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return ERR_PTR(-EINVAL);
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if (strcmp(parent_path, "/"))
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kfree(parent_path);
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return parent;
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}
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[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 17:16:30 +08:00
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static BLOCKING_NOTIFIER_HEAD(pSeries_reconfig_chain);
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2005-04-17 06:20:36 +08:00
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int pSeries_reconfig_notifier_register(struct notifier_block *nb)
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{
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[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 17:16:30 +08:00
|
|
|
return blocking_notifier_chain_register(&pSeries_reconfig_chain, nb);
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
|
|
|
|
|
|
|
void pSeries_reconfig_notifier_unregister(struct notifier_block *nb)
|
|
|
|
{
|
[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 17:16:30 +08:00
|
|
|
blocking_notifier_chain_unregister(&pSeries_reconfig_chain, nb);
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
|
|
|
|
|
|
|
static int pSeries_reconfig_add_node(const char *path, struct property *proplist)
|
|
|
|
{
|
|
|
|
struct device_node *np;
|
|
|
|
int err = -ENOMEM;
|
|
|
|
|
2005-09-07 06:18:32 +08:00
|
|
|
np = kzalloc(sizeof(*np), GFP_KERNEL);
|
2005-04-17 06:20:36 +08:00
|
|
|
if (!np)
|
|
|
|
goto out_err;
|
|
|
|
|
|
|
|
np->full_name = kmalloc(strlen(path) + 1, GFP_KERNEL);
|
|
|
|
if (!np->full_name)
|
|
|
|
goto out_err;
|
|
|
|
|
|
|
|
strcpy(np->full_name, path);
|
|
|
|
|
|
|
|
np->properties = proplist;
|
2007-06-19 14:07:58 +08:00
|
|
|
of_node_set_flag(np, OF_DYNAMIC);
|
2005-04-17 06:20:36 +08:00
|
|
|
kref_init(&np->kref);
|
|
|
|
|
|
|
|
np->parent = derive_parent(path);
|
|
|
|
if (IS_ERR(np->parent)) {
|
|
|
|
err = PTR_ERR(np->parent);
|
|
|
|
goto out_err;
|
|
|
|
}
|
|
|
|
|
[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 17:16:30 +08:00
|
|
|
err = blocking_notifier_call_chain(&pSeries_reconfig_chain,
|
2005-04-17 06:20:36 +08:00
|
|
|
PSERIES_RECONFIG_ADD, np);
|
|
|
|
if (err == NOTIFY_BAD) {
|
|
|
|
printk(KERN_ERR "Failed to add device node %s\n", path);
|
|
|
|
err = -ENOMEM; /* For now, safe to assume kmalloc failure */
|
|
|
|
goto out_err;
|
|
|
|
}
|
|
|
|
|
|
|
|
of_attach_node(np);
|
|
|
|
|
|
|
|
add_node_proc_entries(np);
|
|
|
|
|
|
|
|
of_node_put(np->parent);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
out_err:
|
|
|
|
if (np) {
|
|
|
|
of_node_put(np->parent);
|
|
|
|
kfree(np->full_name);
|
|
|
|
kfree(np);
|
|
|
|
}
|
|
|
|
return err;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int pSeries_reconfig_remove_node(struct device_node *np)
|
|
|
|
{
|
|
|
|
struct device_node *parent, *child;
|
|
|
|
|
|
|
|
parent = of_get_parent(np);
|
|
|
|
if (!parent)
|
|
|
|
return -EINVAL;
|
|
|
|
|
|
|
|
if ((child = of_get_next_child(np, NULL))) {
|
|
|
|
of_node_put(child);
|
[POWERPC] arch/powerpc/platforms/pseries: Add missing of_node_put
Of_get_parent and of_find_compatible_node do an of_node_get, and thus a
corresponding of_code_put is needed in the error case.
The problem was found using the following semantic match.
(http://www.emn.fr/x-info/coccinelle/)
// <smpl>
@@
type T,T1,T2;
identifier E;
statement S;
expression x1,x2,x3;
int ret;
@@
T E;
...
* E = \(of_get_parent\|of_find_compatible_node\)(...);
if (E == NULL) S
... when != of_node_put(...,(T1)E,...)
when != if (E != NULL) { ... of_node_put(...,(T1)E,...); ...}
when != x1 = (T1)E
when != E = x3;
when any
if (...) {
... when != of_node_put(...,(T2)E,...)
when != if (E != NULL) { ... of_node_put(...,(T2)E,...); ...}
when != x2 = (T2)E
(
* return;
|
* return ret;
)
}
// </smpl>
Signed-off-by: Julia Lawall <julia@diku.dk>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Kumar Gala <galak@gate.crashing.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
2008-02-05 15:34:58 +08:00
|
|
|
of_node_put(parent);
|
2005-04-17 06:20:36 +08:00
|
|
|
return -EBUSY;
|
|
|
|
}
|
|
|
|
|
|
|
|
remove_node_proc_entries(np);
|
|
|
|
|
[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 17:16:30 +08:00
|
|
|
blocking_notifier_call_chain(&pSeries_reconfig_chain,
|
2005-04-17 06:20:36 +08:00
|
|
|
PSERIES_RECONFIG_REMOVE, np);
|
|
|
|
of_detach_node(np);
|
|
|
|
|
|
|
|
of_node_put(parent);
|
|
|
|
of_node_put(np); /* Must decrement the refcount */
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* /proc/ppc64/ofdt - yucky binary interface for adding and removing
|
|
|
|
* OF device nodes. Should be deprecated as soon as we get an
|
|
|
|
* in-kernel wrapper for the RTAS ibm,configure-connector call.
|
|
|
|
*/
|
|
|
|
|
|
|
|
static void release_prop_list(const struct property *prop)
|
|
|
|
{
|
|
|
|
struct property *next;
|
|
|
|
for (; prop; prop = next) {
|
|
|
|
next = prop->next;
|
|
|
|
kfree(prop->name);
|
|
|
|
kfree(prop->value);
|
|
|
|
kfree(prop);
|
|
|
|
}
|
|
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* parse_next_property - process the next property from raw input buffer
|
|
|
|
* @buf: input buffer, must be nul-terminated
|
|
|
|
* @end: end of the input buffer + 1, for validation
|
|
|
|
* @name: return value; set to property name in buf
|
|
|
|
* @length: return value; set to length of value
|
|
|
|
* @value: return value; set to the property value in buf
|
|
|
|
*
|
|
|
|
* Note that the caller must make copies of the name and value returned,
|
|
|
|
* this function does no allocation or copying of the data. Return value
|
|
|
|
* is set to the next name in buf, or NULL on error.
|
|
|
|
*/
|
|
|
|
static char * parse_next_property(char *buf, char *end, char **name, int *length,
|
|
|
|
unsigned char **value)
|
|
|
|
{
|
|
|
|
char *tmp;
|
|
|
|
|
|
|
|
*name = buf;
|
|
|
|
|
|
|
|
tmp = strchr(buf, ' ');
|
|
|
|
if (!tmp) {
|
|
|
|
printk(KERN_ERR "property parse failed in %s at line %d\n",
|
2008-03-29 05:21:07 +08:00
|
|
|
__func__, __LINE__);
|
2005-04-17 06:20:36 +08:00
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
*tmp = '\0';
|
|
|
|
|
|
|
|
if (++tmp >= end) {
|
|
|
|
printk(KERN_ERR "property parse failed in %s at line %d\n",
|
2008-03-29 05:21:07 +08:00
|
|
|
__func__, __LINE__);
|
2005-04-17 06:20:36 +08:00
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* now we're on the length */
|
|
|
|
*length = -1;
|
|
|
|
*length = simple_strtoul(tmp, &tmp, 10);
|
|
|
|
if (*length == -1) {
|
|
|
|
printk(KERN_ERR "property parse failed in %s at line %d\n",
|
2008-03-29 05:21:07 +08:00
|
|
|
__func__, __LINE__);
|
2005-04-17 06:20:36 +08:00
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
if (*tmp != ' ' || ++tmp >= end) {
|
|
|
|
printk(KERN_ERR "property parse failed in %s at line %d\n",
|
2008-03-29 05:21:07 +08:00
|
|
|
__func__, __LINE__);
|
2005-04-17 06:20:36 +08:00
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* now we're on the value */
|
|
|
|
*value = tmp;
|
|
|
|
tmp += *length;
|
|
|
|
if (tmp > end) {
|
|
|
|
printk(KERN_ERR "property parse failed in %s at line %d\n",
|
2008-03-29 05:21:07 +08:00
|
|
|
__func__, __LINE__);
|
2005-04-17 06:20:36 +08:00
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
else if (tmp < end && *tmp != ' ' && *tmp != '\0') {
|
|
|
|
printk(KERN_ERR "property parse failed in %s at line %d\n",
|
2008-03-29 05:21:07 +08:00
|
|
|
__func__, __LINE__);
|
2005-04-17 06:20:36 +08:00
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
tmp++;
|
|
|
|
|
|
|
|
/* and now we should be on the next name, or the end */
|
|
|
|
return tmp;
|
|
|
|
}
|
|
|
|
|
|
|
|
static struct property *new_property(const char *name, const int length,
|
|
|
|
const unsigned char *value, struct property *last)
|
|
|
|
{
|
2006-12-02 19:26:57 +08:00
|
|
|
struct property *new = kzalloc(sizeof(*new), GFP_KERNEL);
|
2005-04-17 06:20:36 +08:00
|
|
|
|
|
|
|
if (!new)
|
|
|
|
return NULL;
|
|
|
|
|
|
|
|
if (!(new->name = kmalloc(strlen(name) + 1, GFP_KERNEL)))
|
|
|
|
goto cleanup;
|
|
|
|
if (!(new->value = kmalloc(length + 1, GFP_KERNEL)))
|
|
|
|
goto cleanup;
|
|
|
|
|
|
|
|
strcpy(new->name, name);
|
|
|
|
memcpy(new->value, value, length);
|
|
|
|
*(((char *)new->value) + length) = 0;
|
|
|
|
new->length = length;
|
|
|
|
new->next = last;
|
|
|
|
return new;
|
|
|
|
|
|
|
|
cleanup:
|
2005-11-07 17:01:35 +08:00
|
|
|
kfree(new->name);
|
|
|
|
kfree(new->value);
|
2005-04-17 06:20:36 +08:00
|
|
|
kfree(new);
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int do_add_node(char *buf, size_t bufsize)
|
|
|
|
{
|
|
|
|
char *path, *end, *name;
|
|
|
|
struct device_node *np;
|
|
|
|
struct property *prop = NULL;
|
|
|
|
unsigned char* value;
|
|
|
|
int length, rv = 0;
|
|
|
|
|
|
|
|
end = buf + bufsize;
|
|
|
|
path = buf;
|
|
|
|
buf = strchr(buf, ' ');
|
|
|
|
if (!buf)
|
|
|
|
return -EINVAL;
|
|
|
|
*buf = '\0';
|
|
|
|
buf++;
|
|
|
|
|
|
|
|
if ((np = of_find_node_by_path(path))) {
|
|
|
|
of_node_put(np);
|
|
|
|
return -EINVAL;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* rv = build_prop_list(tmp, bufsize - (tmp - buf), &proplist); */
|
|
|
|
while (buf < end &&
|
|
|
|
(buf = parse_next_property(buf, end, &name, &length, &value))) {
|
|
|
|
struct property *last = prop;
|
|
|
|
|
|
|
|
prop = new_property(name, length, value, last);
|
|
|
|
if (!prop) {
|
|
|
|
rv = -ENOMEM;
|
|
|
|
prop = last;
|
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
if (!buf) {
|
|
|
|
rv = -EINVAL;
|
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
|
|
|
|
rv = pSeries_reconfig_add_node(path, prop);
|
|
|
|
|
|
|
|
out:
|
|
|
|
if (rv)
|
|
|
|
release_prop_list(prop);
|
|
|
|
return rv;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int do_remove_node(char *buf)
|
|
|
|
{
|
|
|
|
struct device_node *node;
|
|
|
|
int rv = -ENODEV;
|
|
|
|
|
|
|
|
if ((node = of_find_node_by_path(buf)))
|
|
|
|
rv = pSeries_reconfig_remove_node(node);
|
|
|
|
|
|
|
|
of_node_put(node);
|
|
|
|
return rv;
|
|
|
|
}
|
|
|
|
|
2006-01-13 06:10:22 +08:00
|
|
|
static char *parse_node(char *buf, size_t bufsize, struct device_node **npp)
|
|
|
|
{
|
|
|
|
char *handle_str;
|
|
|
|
phandle handle;
|
|
|
|
*npp = NULL;
|
|
|
|
|
|
|
|
handle_str = buf;
|
|
|
|
|
|
|
|
buf = strchr(buf, ' ');
|
|
|
|
if (!buf)
|
|
|
|
return NULL;
|
|
|
|
*buf = '\0';
|
|
|
|
buf++;
|
|
|
|
|
2008-07-03 11:19:24 +08:00
|
|
|
handle = simple_strtoul(handle_str, NULL, 0);
|
2006-01-13 06:10:22 +08:00
|
|
|
|
|
|
|
*npp = of_find_node_by_phandle(handle);
|
|
|
|
return buf;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int do_add_property(char *buf, size_t bufsize)
|
|
|
|
{
|
|
|
|
struct property *prop = NULL;
|
|
|
|
struct device_node *np;
|
|
|
|
unsigned char *value;
|
|
|
|
char *name, *end;
|
|
|
|
int length;
|
|
|
|
end = buf + bufsize;
|
|
|
|
buf = parse_node(buf, bufsize, &np);
|
|
|
|
|
|
|
|
if (!np)
|
|
|
|
return -ENODEV;
|
|
|
|
|
|
|
|
if (parse_next_property(buf, end, &name, &length, &value) == NULL)
|
|
|
|
return -EINVAL;
|
|
|
|
|
|
|
|
prop = new_property(name, length, value, NULL);
|
|
|
|
if (!prop)
|
|
|
|
return -ENOMEM;
|
|
|
|
|
|
|
|
prom_add_property(np, prop);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int do_remove_property(char *buf, size_t bufsize)
|
|
|
|
{
|
|
|
|
struct device_node *np;
|
|
|
|
char *tmp;
|
|
|
|
struct property *prop;
|
|
|
|
buf = parse_node(buf, bufsize, &np);
|
|
|
|
|
|
|
|
if (!np)
|
|
|
|
return -ENODEV;
|
|
|
|
|
|
|
|
tmp = strchr(buf,' ');
|
|
|
|
if (tmp)
|
|
|
|
*tmp = '\0';
|
|
|
|
|
|
|
|
if (strlen(buf) == 0)
|
|
|
|
return -EINVAL;
|
|
|
|
|
|
|
|
prop = of_find_property(np, buf, NULL);
|
|
|
|
|
|
|
|
return prom_remove_property(np, prop);
|
|
|
|
}
|
|
|
|
|
|
|
|
static int do_update_property(char *buf, size_t bufsize)
|
|
|
|
{
|
|
|
|
struct device_node *np;
|
|
|
|
unsigned char *value;
|
2008-07-03 11:22:39 +08:00
|
|
|
char *name, *end, *next_prop;
|
|
|
|
int rc, length;
|
2006-01-13 06:10:22 +08:00
|
|
|
struct property *newprop, *oldprop;
|
|
|
|
buf = parse_node(buf, bufsize, &np);
|
|
|
|
end = buf + bufsize;
|
|
|
|
|
|
|
|
if (!np)
|
|
|
|
return -ENODEV;
|
|
|
|
|
2008-07-03 11:22:39 +08:00
|
|
|
next_prop = parse_next_property(buf, end, &name, &length, &value);
|
|
|
|
if (!next_prop)
|
2006-01-13 06:10:22 +08:00
|
|
|
return -EINVAL;
|
|
|
|
|
|
|
|
newprop = new_property(name, length, value, NULL);
|
|
|
|
if (!newprop)
|
|
|
|
return -ENOMEM;
|
|
|
|
|
|
|
|
oldprop = of_find_property(np, name,NULL);
|
|
|
|
if (!oldprop)
|
|
|
|
return -ENODEV;
|
|
|
|
|
2008-07-03 11:22:39 +08:00
|
|
|
rc = prom_update_property(np, newprop, oldprop);
|
|
|
|
if (rc)
|
|
|
|
return rc;
|
|
|
|
|
|
|
|
/* For memory under the ibm,dynamic-reconfiguration-memory node
|
|
|
|
* of the device tree, adding and removing memory is just an update
|
|
|
|
* to the ibm,dynamic-memory property instead of adding/removing a
|
|
|
|
* memory node in the device tree. For these cases we still need to
|
|
|
|
* involve the notifier chain.
|
|
|
|
*/
|
|
|
|
if (!strcmp(name, "ibm,dynamic-memory")) {
|
|
|
|
int action;
|
|
|
|
|
|
|
|
next_prop = parse_next_property(next_prop, end, &name,
|
|
|
|
&length, &value);
|
|
|
|
if (!next_prop)
|
|
|
|
return -EINVAL;
|
|
|
|
|
|
|
|
if (!strcmp(name, "add"))
|
|
|
|
action = PSERIES_DRCONF_MEM_ADD;
|
|
|
|
else
|
|
|
|
action = PSERIES_DRCONF_MEM_REMOVE;
|
|
|
|
|
2008-08-26 03:33:34 +08:00
|
|
|
rc = blocking_notifier_call_chain(&pSeries_reconfig_chain,
|
|
|
|
action, value);
|
2009-03-09 08:00:00 +08:00
|
|
|
if (rc == NOTIFY_BAD) {
|
|
|
|
rc = prom_update_property(np, oldprop, newprop);
|
|
|
|
return -ENOMEM;
|
|
|
|
}
|
2008-07-03 11:22:39 +08:00
|
|
|
}
|
|
|
|
|
2009-03-09 08:00:00 +08:00
|
|
|
return 0;
|
2006-01-13 06:10:22 +08:00
|
|
|
}
|
|
|
|
|
2005-04-17 06:20:36 +08:00
|
|
|
/**
|
|
|
|
* ofdt_write - perform operations on the Open Firmware device tree
|
|
|
|
*
|
|
|
|
* @file: not used
|
|
|
|
* @buf: command and arguments
|
|
|
|
* @count: size of the command buffer
|
|
|
|
* @off: not used
|
|
|
|
*
|
|
|
|
* Operations supported at this time are addition and removal of
|
|
|
|
* whole nodes along with their properties. Operations on individual
|
|
|
|
* properties are not implemented (yet).
|
|
|
|
*/
|
|
|
|
static ssize_t ofdt_write(struct file *file, const char __user *buf, size_t count,
|
|
|
|
loff_t *off)
|
|
|
|
{
|
|
|
|
int rv = 0;
|
|
|
|
char *kbuf;
|
|
|
|
char *tmp;
|
|
|
|
|
|
|
|
if (!(kbuf = kmalloc(count + 1, GFP_KERNEL))) {
|
|
|
|
rv = -ENOMEM;
|
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
if (copy_from_user(kbuf, buf, count)) {
|
|
|
|
rv = -EFAULT;
|
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
|
|
|
|
kbuf[count] = '\0';
|
|
|
|
|
|
|
|
tmp = strchr(kbuf, ' ');
|
|
|
|
if (!tmp) {
|
|
|
|
rv = -EINVAL;
|
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
*tmp = '\0';
|
|
|
|
tmp++;
|
|
|
|
|
|
|
|
if (!strcmp(kbuf, "add_node"))
|
|
|
|
rv = do_add_node(tmp, count - (tmp - kbuf));
|
|
|
|
else if (!strcmp(kbuf, "remove_node"))
|
|
|
|
rv = do_remove_node(tmp);
|
2006-01-13 06:10:22 +08:00
|
|
|
else if (!strcmp(kbuf, "add_property"))
|
|
|
|
rv = do_add_property(tmp, count - (tmp - kbuf));
|
|
|
|
else if (!strcmp(kbuf, "remove_property"))
|
|
|
|
rv = do_remove_property(tmp, count - (tmp - kbuf));
|
|
|
|
else if (!strcmp(kbuf, "update_property"))
|
|
|
|
rv = do_update_property(tmp, count - (tmp - kbuf));
|
2005-04-17 06:20:36 +08:00
|
|
|
else
|
|
|
|
rv = -EINVAL;
|
|
|
|
out:
|
|
|
|
kfree(kbuf);
|
|
|
|
return rv ? rv : count;
|
|
|
|
}
|
|
|
|
|
2007-02-12 16:55:31 +08:00
|
|
|
static const struct file_operations ofdt_fops = {
|
2005-04-17 06:20:36 +08:00
|
|
|
.write = ofdt_write
|
|
|
|
};
|
|
|
|
|
|
|
|
/* create /proc/ppc64/ofdt write-only by root */
|
|
|
|
static int proc_ppc64_create_ofdt(void)
|
|
|
|
{
|
|
|
|
struct proc_dir_entry *ent;
|
|
|
|
|
2006-03-28 20:15:54 +08:00
|
|
|
if (!machine_is(pseries))
|
2005-04-17 06:20:36 +08:00
|
|
|
return 0;
|
|
|
|
|
2008-04-29 16:02:26 +08:00
|
|
|
ent = proc_create("ppc64/ofdt", S_IWUSR, NULL, &ofdt_fops);
|
|
|
|
if (ent)
|
2005-04-17 06:20:36 +08:00
|
|
|
ent->size = 0;
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
__initcall(proc_ppc64_create_ofdt);
|