2019-06-02 23:45:02 -06:00
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// SPDX-License-Identifier: GPL-2.0-only
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2005-11-06 22:08:17 -07:00
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/*
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* Windfarm PowerMac thermal control. Core
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*
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* (c) Copyright 2005 Benjamin Herrenschmidt, IBM Corp.
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* <benh@kernel.crashing.org>
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*
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* This core code tracks the list of sensors & controls, register
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* clients, and holds the kernel thread used for control.
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*
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* TODO:
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*
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* Add some information about sensor/control type and data format to
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* sensors/controls, and have the sysfs attribute stuff be moved
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* generically here instead of hard coded in the platform specific
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* driver as it us currently
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*
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* This however requires solving some annoying lifetime issues with
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* sysfs which doesn't seem to have lifetime rules for struct attribute,
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* I may have to create full features kobjects for every sensor/control
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* instead which is a bit of an overkill imho
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*/
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#include <linux/types.h>
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#include <linux/errno.h>
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#include <linux/kernel.h>
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include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h
percpu.h is included by sched.h and module.h and thus ends up being
included when building most .c files. percpu.h includes slab.h which
in turn includes gfp.h making everything defined by the two files
universally available and complicating inclusion dependencies.
percpu.h -> slab.h dependency is about to be removed. Prepare for
this change by updating users of gfp and slab facilities include those
headers directly instead of assuming availability. As this conversion
needs to touch large number of source files, the following script is
used as the basis of conversion.
http://userweb.kernel.org/~tj/misc/slabh-sweep.py
The script does the followings.
* Scan files for gfp and slab usages and update includes such that
only the necessary includes are there. ie. if only gfp is used,
gfp.h, if slab is used, slab.h.
* When the script inserts a new include, it looks at the include
blocks and try to put the new include such that its order conforms
to its surrounding. It's put in the include block which contains
core kernel includes, in the same order that the rest are ordered -
alphabetical, Christmas tree, rev-Xmas-tree or at the end if there
doesn't seem to be any matching order.
* If the script can't find a place to put a new include (mostly
because the file doesn't have fitting include block), it prints out
an error message indicating which .h file needs to be added to the
file.
The conversion was done in the following steps.
1. The initial automatic conversion of all .c files updated slightly
over 4000 files, deleting around 700 includes and adding ~480 gfp.h
and ~3000 slab.h inclusions. The script emitted errors for ~400
files.
2. Each error was manually checked. Some didn't need the inclusion,
some needed manual addition while adding it to implementation .h or
embedding .c file was more appropriate for others. This step added
inclusions to around 150 files.
3. The script was run again and the output was compared to the edits
from #2 to make sure no file was left behind.
4. Several build tests were done and a couple of problems were fixed.
e.g. lib/decompress_*.c used malloc/free() wrappers around slab
APIs requiring slab.h to be added manually.
5. The script was run on all .h files but without automatically
editing them as sprinkling gfp.h and slab.h inclusions around .h
files could easily lead to inclusion dependency hell. Most gfp.h
inclusion directives were ignored as stuff from gfp.h was usually
wildly available and often used in preprocessor macros. Each
slab.h inclusion directive was examined and added manually as
necessary.
6. percpu.h was updated not to include slab.h.
7. Build test were done on the following configurations and failures
were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my
distributed build env didn't work with gcov compiles) and a few
more options had to be turned off depending on archs to make things
build (like ipr on powerpc/64 which failed due to missing writeq).
* x86 and x86_64 UP and SMP allmodconfig and a custom test config.
* powerpc and powerpc64 SMP allmodconfig
* sparc and sparc64 SMP allmodconfig
* ia64 SMP allmodconfig
* s390 SMP allmodconfig
* alpha SMP allmodconfig
* um on x86_64 SMP allmodconfig
8. percpu.h modifications were reverted so that it could be applied as
a separate patch and serve as bisection point.
Given the fact that I had only a couple of failures from tests on step
6, I'm fairly confident about the coverage of this conversion patch.
If there is a breakage, it's likely to be something in one of the arch
headers which should be easily discoverable easily on most builds of
the specific arch.
Signed-off-by: Tejun Heo <tj@kernel.org>
Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2010-03-24 02:04:11 -06:00
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#include <linux/slab.h>
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2005-11-06 22:08:17 -07:00
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#include <linux/init.h>
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#include <linux/spinlock.h>
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#include <linux/kthread.h>
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#include <linux/jiffies.h>
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#include <linux/reboot.h>
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#include <linux/device.h>
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#include <linux/platform_device.h>
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2006-01-14 08:18:45 -07:00
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#include <linux/mutex.h>
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2006-12-06 21:34:23 -07:00
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#include <linux/freezer.h>
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2005-11-06 22:08:17 -07:00
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2006-03-02 23:03:21 -07:00
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#include <asm/prom.h>
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2005-11-06 22:08:17 -07:00
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#include "windfarm.h"
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#define VERSION "0.2"
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#undef DEBUG
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#ifdef DEBUG
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#define DBG(args...) printk(args)
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#else
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#define DBG(args...) do { } while(0)
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#endif
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static LIST_HEAD(wf_controls);
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static LIST_HEAD(wf_sensors);
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2006-01-14 08:18:45 -07:00
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static DEFINE_MUTEX(wf_lock);
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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 02:16:30 -07:00
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static BLOCKING_NOTIFIER_HEAD(wf_client_list);
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2005-11-06 22:08:17 -07:00
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static int wf_client_count;
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static unsigned int wf_overtemp;
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static unsigned int wf_overtemp_counter;
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struct task_struct *wf_thread;
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2006-02-07 22:42:51 -07:00
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static struct platform_device wf_platform_device = {
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.name = "windfarm",
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};
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2005-11-06 22:08:17 -07:00
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/*
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* Utilities & tick thread
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*/
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static inline void wf_notify(int event, void *param)
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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 02:16:30 -07:00
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blocking_notifier_call_chain(&wf_client_list, event, param);
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2005-11-06 22:08:17 -07:00
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}
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2015-07-31 06:12:20 -06:00
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static int wf_critical_overtemp(void)
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2005-11-06 22:08:17 -07:00
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{
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2016-12-11 10:00:43 -07:00
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static char const critical_overtemp_path[] = "/sbin/critical_overtemp";
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char *argv[] = { (char *)critical_overtemp_path, NULL };
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2005-11-06 22:08:17 -07:00
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static char *envp[] = { "HOME=/",
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"TERM=linux",
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"PATH=/sbin:/usr/sbin:/bin:/usr/bin",
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NULL };
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2007-07-17 19:37:03 -06:00
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return call_usermodehelper(critical_overtemp_path,
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argv, envp, UMH_WAIT_EXEC);
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2005-11-06 22:08:17 -07:00
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}
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static int wf_thread_func(void *data)
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{
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unsigned long next, delay;
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next = jiffies;
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DBG("wf: thread started\n");
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2007-07-17 05:03:35 -06:00
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set_freezable();
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2007-11-07 03:18:02 -07:00
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while (!kthread_should_stop()) {
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try_to_freeze();
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2005-11-06 22:08:17 -07:00
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if (time_after_eq(jiffies, next)) {
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wf_notify(WF_EVENT_TICK, NULL);
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if (wf_overtemp) {
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wf_overtemp_counter++;
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/* 10 seconds overtemp, notify userland */
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if (wf_overtemp_counter > 10)
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wf_critical_overtemp();
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/* 30 seconds, shutdown */
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if (wf_overtemp_counter > 30) {
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printk(KERN_ERR "windfarm: Overtemp "
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"for more than 30"
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" seconds, shutting down\n");
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machine_power_off();
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}
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}
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next += HZ;
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}
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delay = next - jiffies;
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if (delay <= HZ)
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schedule_timeout_interruptible(delay);
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}
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DBG("wf: thread stopped\n");
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return 0;
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}
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static void wf_start_thread(void)
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{
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wf_thread = kthread_run(wf_thread_func, NULL, "kwindfarm");
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if (IS_ERR(wf_thread)) {
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printk(KERN_ERR "windfarm: failed to create thread,err %ld\n",
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PTR_ERR(wf_thread));
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wf_thread = NULL;
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}
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}
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static void wf_stop_thread(void)
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{
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if (wf_thread)
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kthread_stop(wf_thread);
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wf_thread = NULL;
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}
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/*
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* Controls
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*/
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static void wf_control_release(struct kref *kref)
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{
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struct wf_control *ct = container_of(kref, struct wf_control, ref);
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DBG("wf: Deleting control %s\n", ct->name);
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if (ct->ops && ct->ops->release)
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ct->ops->release(ct);
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else
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kfree(ct);
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}
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2006-02-07 22:42:51 -07:00
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static ssize_t wf_show_control(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct wf_control *ctrl = container_of(attr, struct wf_control, attr);
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2012-04-18 16:16:50 -06:00
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const char *typestr;
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2006-02-07 22:42:51 -07:00
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s32 val = 0;
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int err;
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err = ctrl->ops->get_value(ctrl, &val);
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2012-04-29 09:42:27 -06:00
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if (err < 0) {
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if (err == -EFAULT)
|
|
|
|
return sprintf(buf, "<HW FAULT>\n");
|
2006-02-07 22:42:51 -07:00
|
|
|
return err;
|
2012-04-29 09:42:27 -06:00
|
|
|
}
|
2012-04-18 16:16:50 -06:00
|
|
|
switch(ctrl->type) {
|
|
|
|
case WF_CONTROL_RPM_FAN:
|
|
|
|
typestr = " RPM";
|
|
|
|
break;
|
|
|
|
case WF_CONTROL_PWM_FAN:
|
|
|
|
typestr = " %";
|
|
|
|
break;
|
|
|
|
default:
|
|
|
|
typestr = "";
|
|
|
|
}
|
|
|
|
return sprintf(buf, "%d%s\n", val, typestr);
|
2006-02-07 22:42:51 -07:00
|
|
|
}
|
|
|
|
|
|
|
|
/* This is really only for debugging... */
|
|
|
|
static ssize_t wf_store_control(struct device *dev,
|
|
|
|
struct device_attribute *attr,
|
|
|
|
const char *buf, size_t count)
|
|
|
|
{
|
|
|
|
struct wf_control *ctrl = container_of(attr, struct wf_control, attr);
|
|
|
|
int val;
|
|
|
|
int err;
|
|
|
|
char *endp;
|
|
|
|
|
|
|
|
val = simple_strtoul(buf, &endp, 0);
|
|
|
|
while (endp < buf + count && (*endp == ' ' || *endp == '\n'))
|
|
|
|
++endp;
|
|
|
|
if (endp - buf < count)
|
|
|
|
return -EINVAL;
|
|
|
|
err = ctrl->ops->set_value(ctrl, val);
|
|
|
|
if (err < 0)
|
|
|
|
return err;
|
|
|
|
return count;
|
|
|
|
}
|
|
|
|
|
2005-11-06 22:08:17 -07:00
|
|
|
int wf_register_control(struct wf_control *new_ct)
|
|
|
|
{
|
|
|
|
struct wf_control *ct;
|
|
|
|
|
2006-01-14 08:18:45 -07:00
|
|
|
mutex_lock(&wf_lock);
|
2005-11-06 22:08:17 -07:00
|
|
|
list_for_each_entry(ct, &wf_controls, link) {
|
|
|
|
if (!strcmp(ct->name, new_ct->name)) {
|
|
|
|
printk(KERN_WARNING "windfarm: trying to register"
|
|
|
|
" duplicate control %s\n", ct->name);
|
2006-01-14 08:18:45 -07:00
|
|
|
mutex_unlock(&wf_lock);
|
2005-11-06 22:08:17 -07:00
|
|
|
return -EEXIST;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
kref_init(&new_ct->ref);
|
|
|
|
list_add(&new_ct->link, &wf_controls);
|
|
|
|
|
2010-04-06 15:34:52 -06:00
|
|
|
sysfs_attr_init(&new_ct->attr.attr);
|
2006-02-07 22:42:51 -07:00
|
|
|
new_ct->attr.attr.name = new_ct->name;
|
|
|
|
new_ct->attr.attr.mode = 0644;
|
|
|
|
new_ct->attr.show = wf_show_control;
|
|
|
|
new_ct->attr.store = wf_store_control;
|
2007-05-16 19:22:15 -06:00
|
|
|
if (device_create_file(&wf_platform_device.dev, &new_ct->attr))
|
|
|
|
printk(KERN_WARNING "windfarm: device_create_file failed"
|
|
|
|
" for %s\n", new_ct->name);
|
|
|
|
/* the subsystem still does useful work without the file */
|
2006-02-07 22:42:51 -07:00
|
|
|
|
2005-11-06 22:08:17 -07:00
|
|
|
DBG("wf: Registered control %s\n", new_ct->name);
|
|
|
|
|
|
|
|
wf_notify(WF_EVENT_NEW_CONTROL, new_ct);
|
2006-01-14 08:18:45 -07:00
|
|
|
mutex_unlock(&wf_lock);
|
2005-11-06 22:08:17 -07:00
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(wf_register_control);
|
|
|
|
|
|
|
|
void wf_unregister_control(struct wf_control *ct)
|
|
|
|
{
|
2006-01-14 08:18:45 -07:00
|
|
|
mutex_lock(&wf_lock);
|
2005-11-06 22:08:17 -07:00
|
|
|
list_del(&ct->link);
|
2006-01-14 08:18:45 -07:00
|
|
|
mutex_unlock(&wf_lock);
|
2005-11-06 22:08:17 -07:00
|
|
|
|
|
|
|
DBG("wf: Unregistered control %s\n", ct->name);
|
|
|
|
|
|
|
|
kref_put(&ct->ref, wf_control_release);
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(wf_unregister_control);
|
|
|
|
|
|
|
|
int wf_get_control(struct wf_control *ct)
|
|
|
|
{
|
|
|
|
if (!try_module_get(ct->ops->owner))
|
|
|
|
return -ENODEV;
|
|
|
|
kref_get(&ct->ref);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(wf_get_control);
|
|
|
|
|
|
|
|
void wf_put_control(struct wf_control *ct)
|
|
|
|
{
|
|
|
|
struct module *mod = ct->ops->owner;
|
|
|
|
kref_put(&ct->ref, wf_control_release);
|
|
|
|
module_put(mod);
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(wf_put_control);
|
|
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Sensors
|
|
|
|
*/
|
|
|
|
|
|
|
|
|
|
|
|
static void wf_sensor_release(struct kref *kref)
|
|
|
|
{
|
|
|
|
struct wf_sensor *sr = container_of(kref, struct wf_sensor, ref);
|
|
|
|
|
|
|
|
DBG("wf: Deleting sensor %s\n", sr->name);
|
|
|
|
|
|
|
|
if (sr->ops && sr->ops->release)
|
|
|
|
sr->ops->release(sr);
|
|
|
|
else
|
|
|
|
kfree(sr);
|
|
|
|
}
|
|
|
|
|
2006-02-07 22:42:51 -07:00
|
|
|
static ssize_t wf_show_sensor(struct device *dev,
|
|
|
|
struct device_attribute *attr, char *buf)
|
|
|
|
{
|
|
|
|
struct wf_sensor *sens = container_of(attr, struct wf_sensor, attr);
|
|
|
|
s32 val = 0;
|
|
|
|
int err;
|
|
|
|
|
|
|
|
err = sens->ops->get_value(sens, &val);
|
|
|
|
if (err < 0)
|
|
|
|
return err;
|
|
|
|
return sprintf(buf, "%d.%03d\n", FIX32TOPRINT(val));
|
|
|
|
}
|
|
|
|
|
2005-11-06 22:08:17 -07:00
|
|
|
int wf_register_sensor(struct wf_sensor *new_sr)
|
|
|
|
{
|
|
|
|
struct wf_sensor *sr;
|
|
|
|
|
2006-01-14 08:18:45 -07:00
|
|
|
mutex_lock(&wf_lock);
|
2005-11-06 22:08:17 -07:00
|
|
|
list_for_each_entry(sr, &wf_sensors, link) {
|
|
|
|
if (!strcmp(sr->name, new_sr->name)) {
|
|
|
|
printk(KERN_WARNING "windfarm: trying to register"
|
|
|
|
" duplicate sensor %s\n", sr->name);
|
2006-01-14 08:18:45 -07:00
|
|
|
mutex_unlock(&wf_lock);
|
2005-11-06 22:08:17 -07:00
|
|
|
return -EEXIST;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
kref_init(&new_sr->ref);
|
|
|
|
list_add(&new_sr->link, &wf_sensors);
|
|
|
|
|
2010-02-20 08:43:02 -07:00
|
|
|
sysfs_attr_init(&new_sr->attr.attr);
|
2006-02-07 22:42:51 -07:00
|
|
|
new_sr->attr.attr.name = new_sr->name;
|
|
|
|
new_sr->attr.attr.mode = 0444;
|
|
|
|
new_sr->attr.show = wf_show_sensor;
|
|
|
|
new_sr->attr.store = NULL;
|
2007-05-16 19:22:15 -06:00
|
|
|
if (device_create_file(&wf_platform_device.dev, &new_sr->attr))
|
|
|
|
printk(KERN_WARNING "windfarm: device_create_file failed"
|
|
|
|
" for %s\n", new_sr->name);
|
|
|
|
/* the subsystem still does useful work without the file */
|
2006-02-07 22:42:51 -07:00
|
|
|
|
2005-11-06 22:08:17 -07:00
|
|
|
DBG("wf: Registered sensor %s\n", new_sr->name);
|
|
|
|
|
|
|
|
wf_notify(WF_EVENT_NEW_SENSOR, new_sr);
|
2006-01-14 08:18:45 -07:00
|
|
|
mutex_unlock(&wf_lock);
|
2005-11-06 22:08:17 -07:00
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(wf_register_sensor);
|
|
|
|
|
|
|
|
void wf_unregister_sensor(struct wf_sensor *sr)
|
|
|
|
{
|
2006-01-14 08:18:45 -07:00
|
|
|
mutex_lock(&wf_lock);
|
2005-11-06 22:08:17 -07:00
|
|
|
list_del(&sr->link);
|
2006-01-14 08:18:45 -07:00
|
|
|
mutex_unlock(&wf_lock);
|
2005-11-06 22:08:17 -07:00
|
|
|
|
|
|
|
DBG("wf: Unregistered sensor %s\n", sr->name);
|
|
|
|
|
|
|
|
wf_put_sensor(sr);
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(wf_unregister_sensor);
|
|
|
|
|
|
|
|
int wf_get_sensor(struct wf_sensor *sr)
|
|
|
|
{
|
|
|
|
if (!try_module_get(sr->ops->owner))
|
|
|
|
return -ENODEV;
|
|
|
|
kref_get(&sr->ref);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(wf_get_sensor);
|
|
|
|
|
|
|
|
void wf_put_sensor(struct wf_sensor *sr)
|
|
|
|
{
|
|
|
|
struct module *mod = sr->ops->owner;
|
|
|
|
kref_put(&sr->ref, wf_sensor_release);
|
|
|
|
module_put(mod);
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(wf_put_sensor);
|
|
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Client & notification
|
|
|
|
*/
|
|
|
|
|
|
|
|
int wf_register_client(struct notifier_block *nb)
|
|
|
|
{
|
|
|
|
int rc;
|
|
|
|
struct wf_control *ct;
|
|
|
|
struct wf_sensor *sr;
|
|
|
|
|
2006-01-14 08:18:45 -07:00
|
|
|
mutex_lock(&wf_lock);
|
[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
|
|
|
rc = blocking_notifier_chain_register(&wf_client_list, nb);
|
2005-11-06 22:08:17 -07:00
|
|
|
if (rc != 0)
|
|
|
|
goto bail;
|
|
|
|
wf_client_count++;
|
|
|
|
list_for_each_entry(ct, &wf_controls, link)
|
|
|
|
wf_notify(WF_EVENT_NEW_CONTROL, ct);
|
|
|
|
list_for_each_entry(sr, &wf_sensors, link)
|
|
|
|
wf_notify(WF_EVENT_NEW_SENSOR, sr);
|
|
|
|
if (wf_client_count == 1)
|
|
|
|
wf_start_thread();
|
|
|
|
bail:
|
2006-01-14 08:18:45 -07:00
|
|
|
mutex_unlock(&wf_lock);
|
2005-11-06 22:08:17 -07:00
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(wf_register_client);
|
|
|
|
|
|
|
|
int wf_unregister_client(struct notifier_block *nb)
|
|
|
|
{
|
2006-01-14 08:18:45 -07:00
|
|
|
mutex_lock(&wf_lock);
|
[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
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blocking_notifier_chain_unregister(&wf_client_list, nb);
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2015-07-31 06:08:58 -06:00
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wf_client_count--;
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2005-11-06 22:08:17 -07:00
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if (wf_client_count == 0)
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wf_stop_thread();
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2006-01-14 08:18:45 -07:00
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mutex_unlock(&wf_lock);
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2005-11-06 22:08:17 -07:00
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return 0;
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}
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EXPORT_SYMBOL_GPL(wf_unregister_client);
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void wf_set_overtemp(void)
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{
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2006-01-14 08:18:45 -07:00
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mutex_lock(&wf_lock);
|
2005-11-06 22:08:17 -07:00
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wf_overtemp++;
|
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|
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if (wf_overtemp == 1) {
|
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printk(KERN_WARNING "windfarm: Overtemp condition detected !\n");
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wf_overtemp_counter = 0;
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wf_notify(WF_EVENT_OVERTEMP, NULL);
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|
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}
|
2006-01-14 08:18:45 -07:00
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mutex_unlock(&wf_lock);
|
2005-11-06 22:08:17 -07:00
|
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|
}
|
|
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EXPORT_SYMBOL_GPL(wf_set_overtemp);
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void wf_clear_overtemp(void)
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|
{
|
2006-01-14 08:18:45 -07:00
|
|
|
mutex_lock(&wf_lock);
|
2005-11-06 22:08:17 -07:00
|
|
|
WARN_ON(wf_overtemp == 0);
|
|
|
|
if (wf_overtemp == 0) {
|
2006-01-14 08:18:45 -07:00
|
|
|
mutex_unlock(&wf_lock);
|
2005-11-06 22:08:17 -07:00
|
|
|
return;
|
|
|
|
}
|
|
|
|
wf_overtemp--;
|
|
|
|
if (wf_overtemp == 0) {
|
|
|
|
printk(KERN_WARNING "windfarm: Overtemp condition cleared !\n");
|
|
|
|
wf_notify(WF_EVENT_NORMALTEMP, NULL);
|
|
|
|
}
|
2006-01-14 08:18:45 -07:00
|
|
|
mutex_unlock(&wf_lock);
|
2005-11-06 22:08:17 -07:00
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(wf_clear_overtemp);
|
|
|
|
|
|
|
|
static int __init windfarm_core_init(void)
|
|
|
|
{
|
|
|
|
DBG("wf: core loaded\n");
|
|
|
|
|
|
|
|
platform_device_register(&wf_platform_device);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void __exit windfarm_core_exit(void)
|
|
|
|
{
|
|
|
|
BUG_ON(wf_client_count != 0);
|
|
|
|
|
|
|
|
DBG("wf: core unloaded\n");
|
|
|
|
|
|
|
|
platform_device_unregister(&wf_platform_device);
|
|
|
|
}
|
|
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|
|
|
|
|
|
|
|
|
module_init(windfarm_core_init);
|
|
|
|
module_exit(windfarm_core_exit);
|
|
|
|
|
|
|
|
MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>");
|
|
|
|
MODULE_DESCRIPTION("Core component of PowerMac thermal control");
|
|
|
|
MODULE_LICENSE("GPL");
|
|
|
|
|