History log of /drivers/s390/cio/css.c
Revision Date Author Comments
817e5000ebc4d448ca514db49b55073a724f8552 01-Dec-2011 Sebastian Ott <sebott@linux.vnet.ibm.com> [S390] hibernate: directly trigger subchannel evaluation

Using the generic css_schedule_eval to evaluate subchannels
while resuming from hibernation is very slow when used with
many devices. Provide a new evaluation trigger which exploits
css_sched_sch_todo and use this in the resume callback for
ccw devices.

Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
f0c077a8b7f9dce590c760a7b2f3c417dffa52d1 08-Jul-2011 Akinobu Mita <akinobu.mita@gmail.com> PM: Improve error code of pm_notifier_call_chain()

This enables pm_notifier_call_chain() to get the actual error code
in the callback rather than always assume -EINVAL by converting all
PM notifier calls to return encapsulate error code with
notifier_from_errno().

Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
3041b6ab5f36ac303981e9f170ff2ae43dc9d125 15-Mar-2011 Sebastian Ott <sebott@linux.vnet.ibm.com> [S390] css_bus_type: make it static

Make css_bus_type static. Subchannel drivers have to
use css_driver_register.

Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
e6aed122a9185d0fe5890f02ea8efc32c355bc44 15-Mar-2011 Sebastian Ott <sebott@linux.vnet.ibm.com> [S390] css_driver: remove duplicate members

Remove the owner and name members of struct
css_driver and convert all drivers to store
this data in the embedded struct device_driver.

Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
4bc4e965d3e86897e4c7c487a477ccdf13db5b82 05-Jan-2011 Sebastian Ott <sebott@linux.vnet.ibm.com> [S390] css: update subchannel descriptor

Update the subchannel descriptor if we receive a
"Installed parameters modified" crw.

Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
8d7bfb4a891d606d52e1a99cf7231b4417b935dc 01-Dec-2010 Sebastian Ott <sebott@linux.vnet.ibm.com> [S390] css: fix rsid evaluation for 2nd crw

Use correct bit positions of rsid field.

Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
eb4f5d93d70458ea644e0f46737f0bcf87280e83 25-Oct-2010 Sebastian Ott <sebott@linux.vnet.ibm.com> [S390] css: update subchannel description after hibernate

Update the subchannel descriptor while resuming from hibernate
in order to obtain current link addresses.

Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
62da177ac2bc1f6f3707230070af268b1e689651 25-Oct-2010 Sebastian Ott <sebott@linux.vnet.ibm.com> [S390] css: update descriptor after hibernate

Update the channel path descriptors after hibernation.
This is done unlocked, since we are the only active
task at this time.

Note: chsc_determine_base_channel_path_desc is changed
to use spin_lock_irqsave, since it's called with
interrupts disabled in this case.

Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
34196f82b16749e119db5572271944c4add0a9aa 25-Oct-2010 Sebastian Ott <sebott@linux.vnet.ibm.com> [S390] chsc: consolidate memory allocations

Most wrappers around the channel subsystem call have their own logic
to allocate memory (with proper alignment) or use preallocated or
static memory. This patch converts most users of the channel
subsystem call to use the same preallocated page (proteced by a
spinlock).

Note: The sei_page which is used in our crw handler to call
"store event information" has to coexist, since
a) in crw context, while accessing the sei_page, sleeping is allowed
(which will conflict with the spinlock protection of the chsc_page)
b) in crw context, while accessing the sei_page, channel subsystem
calls are allowed (which itself would require the page).

Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
34aec07c170b972a29c954b37047184bd0f9f294 25-Oct-2010 Sebastian Ott <sebott@linux.vnet.ibm.com> [S390] chsc: initialization fixes

This patch fixes:
* kfree vs. free_page usage
* structure definition for determine_css_characteristics
* naming convention for the chsc init function
* deregistration of crw handlers in the cleanup path

Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
a8481c2afeed297426f67ce3fd4ad7eea6b7ddf5 25-Oct-2010 Sebastian Ott <sebott@linux.vnet.ibm.com> [S390] css: fix sparse warning

fix this sparse warning:

drivers/s390/cio/css.c:580:6: warning: symbol 'css_schedule_eval_all_unreg'
was not declared. Should it be static?

Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
6038f373a3dc1f1c26496e60b6c40b164716f07e 15-Aug-2010 Arnd Bergmann <arnd@arndb.de> llseek: automatically add .llseek fop

All file_operations should get a .llseek operation so we can make
nonseekable_open the default for future file operations without a
.llseek pointer.

The three cases that we can automatically detect are no_llseek, seq_lseek
and default_llseek. For cases where we can we can automatically prove that
the file offset is always ignored, we use noop_llseek, which maintains
the current behavior of not returning an error from a seek.

New drivers should normally not use noop_llseek but instead use no_llseek
and call nonseekable_open at open time. Existing drivers can be converted
to do the same when the maintainer knows for certain that no user code
relies on calling seek on the device file.

The generated code is often incorrectly indented and right now contains
comments that clarify for each added line why a specific variant was
chosen. In the version that gets submitted upstream, the comments will
be gone and I will manually fix the indentation, because there does not
seem to be a way to do that using coccinelle.

Some amount of new code is currently sitting in linux-next that should get
the same modifications, which I will do at the end of the merge window.

Many thanks to Julia Lawall for helping me learn to write a semantic
patch that does all this.

===== begin semantic patch =====
// This adds an llseek= method to all file operations,
// as a preparation for making no_llseek the default.
//
// The rules are
// - use no_llseek explicitly if we do nonseekable_open
// - use seq_lseek for sequential files
// - use default_llseek if we know we access f_pos
// - use noop_llseek if we know we don't access f_pos,
// but we still want to allow users to call lseek
//
@ open1 exists @
identifier nested_open;
@@
nested_open(...)
{
<+...
nonseekable_open(...)
...+>
}

@ open exists@
identifier open_f;
identifier i, f;
identifier open1.nested_open;
@@
int open_f(struct inode *i, struct file *f)
{
<+...
(
nonseekable_open(...)
|
nested_open(...)
)
...+>
}

@ read disable optional_qualifier exists @
identifier read_f;
identifier f, p, s, off;
type ssize_t, size_t, loff_t;
expression E;
identifier func;
@@
ssize_t read_f(struct file *f, char *p, size_t s, loff_t *off)
{
<+...
(
*off = E
|
*off += E
|
func(..., off, ...)
|
E = *off
)
...+>
}

@ read_no_fpos disable optional_qualifier exists @
identifier read_f;
identifier f, p, s, off;
type ssize_t, size_t, loff_t;
@@
ssize_t read_f(struct file *f, char *p, size_t s, loff_t *off)
{
... when != off
}

@ write @
identifier write_f;
identifier f, p, s, off;
type ssize_t, size_t, loff_t;
expression E;
identifier func;
@@
ssize_t write_f(struct file *f, const char *p, size_t s, loff_t *off)
{
<+...
(
*off = E
|
*off += E
|
func(..., off, ...)
|
E = *off
)
...+>
}

@ write_no_fpos @
identifier write_f;
identifier f, p, s, off;
type ssize_t, size_t, loff_t;
@@
ssize_t write_f(struct file *f, const char *p, size_t s, loff_t *off)
{
... when != off
}

@ fops0 @
identifier fops;
@@
struct file_operations fops = {
...
};

@ has_llseek depends on fops0 @
identifier fops0.fops;
identifier llseek_f;
@@
struct file_operations fops = {
...
.llseek = llseek_f,
...
};

@ has_read depends on fops0 @
identifier fops0.fops;
identifier read_f;
@@
struct file_operations fops = {
...
.read = read_f,
...
};

@ has_write depends on fops0 @
identifier fops0.fops;
identifier write_f;
@@
struct file_operations fops = {
...
.write = write_f,
...
};

@ has_open depends on fops0 @
identifier fops0.fops;
identifier open_f;
@@
struct file_operations fops = {
...
.open = open_f,
...
};

// use no_llseek if we call nonseekable_open
////////////////////////////////////////////
@ nonseekable1 depends on !has_llseek && has_open @
identifier fops0.fops;
identifier nso ~= "nonseekable_open";
@@
struct file_operations fops = {
... .open = nso, ...
+.llseek = no_llseek, /* nonseekable */
};

@ nonseekable2 depends on !has_llseek @
identifier fops0.fops;
identifier open.open_f;
@@
struct file_operations fops = {
... .open = open_f, ...
+.llseek = no_llseek, /* open uses nonseekable */
};

// use seq_lseek for sequential files
/////////////////////////////////////
@ seq depends on !has_llseek @
identifier fops0.fops;
identifier sr ~= "seq_read";
@@
struct file_operations fops = {
... .read = sr, ...
+.llseek = seq_lseek, /* we have seq_read */
};

// use default_llseek if there is a readdir
///////////////////////////////////////////
@ fops1 depends on !has_llseek && !nonseekable1 && !nonseekable2 && !seq @
identifier fops0.fops;
identifier readdir_e;
@@
// any other fop is used that changes pos
struct file_operations fops = {
... .readdir = readdir_e, ...
+.llseek = default_llseek, /* readdir is present */
};

// use default_llseek if at least one of read/write touches f_pos
/////////////////////////////////////////////////////////////////
@ fops2 depends on !fops1 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @
identifier fops0.fops;
identifier read.read_f;
@@
// read fops use offset
struct file_operations fops = {
... .read = read_f, ...
+.llseek = default_llseek, /* read accesses f_pos */
};

@ fops3 depends on !fops1 && !fops2 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @
identifier fops0.fops;
identifier write.write_f;
@@
// write fops use offset
struct file_operations fops = {
... .write = write_f, ...
+ .llseek = default_llseek, /* write accesses f_pos */
};

// Use noop_llseek if neither read nor write accesses f_pos
///////////////////////////////////////////////////////////

@ fops4 depends on !fops1 && !fops2 && !fops3 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @
identifier fops0.fops;
identifier read_no_fpos.read_f;
identifier write_no_fpos.write_f;
@@
// write fops use offset
struct file_operations fops = {
...
.write = write_f,
.read = read_f,
...
+.llseek = noop_llseek, /* read and write both use no f_pos */
};

@ depends on has_write && !has_read && !fops1 && !fops2 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @
identifier fops0.fops;
identifier write_no_fpos.write_f;
@@
struct file_operations fops = {
... .write = write_f, ...
+.llseek = noop_llseek, /* write uses no f_pos */
};

@ depends on has_read && !has_write && !fops1 && !fops2 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @
identifier fops0.fops;
identifier read_no_fpos.read_f;
@@
struct file_operations fops = {
... .read = read_f, ...
+.llseek = noop_llseek, /* read uses no f_pos */
};

@ depends on !has_read && !has_write && !fops1 && !fops2 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @
identifier fops0.fops;
@@
struct file_operations fops = {
...
+.llseek = noop_llseek, /* no read or write fn */
};
===== End semantic patch =====

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Cc: Julia Lawall <julia@diku.dk>
Cc: Christoph Hellwig <hch@infradead.org>
58ea91c05346f7c6336e6248b743aa9a8e1c19a9 17-May-2010 Martin Schwidefsky <schwidefsky@de.ibm.com> [S390] avoid default_llseek in s390 drivers

Use nonseekable_open for a couple of s390 device drivers. This avoids
the use of default_llseek function which has a dependency on the BKL.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
94038a99119c171aea27608f81c7ba359de98c4e 17-May-2010 Martin Schwidefsky <schwidefsky@de.ibm.com> [S390] More cleanup for struct _lowcore

Remove cpu_id from lowcore and replace addr_t with __u64.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
889ee9556c89a877b8343b6bbe6ac8dc5d57e433 22-Apr-2010 Sebastian Ott <sebott@linux.vnet.ibm.com> [S390] add hook to reenable mss after hibernation

Reenable multiple subchannel sets after hibernation,
prior to the device callbacks.

Cc: <stable@kernel.org>
Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
818c272bd74b834c3ca9347c6a540c2ec880afdc 22-Apr-2010 Sebastian Ott <sebott@linux.vnet.ibm.com> [S390] cio: allow enable_facility from outside init functions

Prepare chsc_enable_facility to be used from outside init functions.
Use static memory for the chsc call and protect its access by a
spinlock (although there is no concurrent usage).

Cc: <stable@kernel.org>
Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
0d01bb89220490763d89571d27e7ee3f13f9b372 26-Feb-2010 Sebastian Ott <sebott@linux.vnet.ibm.com> [S390] cio: trigger subchannel event at resume time

ccw_device_pm_restore: trigger subchannel event to better handle
changes to the subchannel device.

Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
b4c707214c987da021d4d5c4ed54612cf73d80d6 26-Feb-2010 Sebastian Ott <sebott@linux.vnet.ibm.com> [S390] cio: make wait_events interruptible

Make the potentially long blocking wait_event's used by the cio
settle mechanism interruptible.

Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
879acca58a904c25487c89ab11e23eb556fb13d3 26-Feb-2010 Sebastian Ott <sebott@linux.vnet.ibm.com> [S390] cio: introduce cio_settle

This patch introduces a proc file cio_settle. A write request to
this file is blocked until all queued cio actions are handled.

This will allow userspace to wait for pending work affecting
device availability after changing cio_ignore or the hardware
configuration.

Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
be5d3823f29c09676abd2eeea4f9767bc4a1a531 26-Feb-2010 Sebastian Ott <sebott@linux.vnet.ibm.com> [S390] cio: consolidate workqueues

We used to maintain 2 singlethreaded workqueues for synchronization
and to trigger work from interrupt context. Since our latest cio
changes we only use one of these workqueues. So get rid of the
unused workqueue, rename the remaining one to "cio_work_q" and move
its ownership to the channel subsystem driver.

Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
471452104b8520337ae2fb48c4e61cd4896e025d 15-Dec-2009 Alexey Dobriyan <adobriyan@gmail.com> const: constify remaining dev_pm_ops

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
390935acac21f3ea1a130bdca8eb9397cb293643 07-Dec-2009 Peter Oberparleiter <peter.oberparleiter@de.ibm.com> [S390] cio: introduce subchannel todos

Ensure that current and future users of sch->work do not overwrite
each other by introducing a single mechanism for delayed subchannel
work.

Signed-off-by: Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
5d6e6b6f6f3eac10a7f5a15e961bac3b36824d9d 07-Dec-2009 Peter Oberparleiter <peter.oberparleiter@de.ibm.com> [S390] cio: introduce parent-initiated device move

Change the initiative to update subchannel-ccw device associations
to the subchannel: when there is an indication that the internal
association no longer reflects the current hardware state, mark
each affected subchannel as requiring attention. Once processing
reaches a subchannel, determine the correct association for that
subchannel at that time and perform the necessary device_move
operations.

This change fixes problems with the previous approach which would
leave devices in an inconsistent state when a new hardware change
occurred while a device_move was already scheduled.

Signed-off-by: Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
703e5c9993639284bc0a8929b6de362424df7019 22-Sep-2009 Sebastian Ott <sebott@linux.vnet.ibm.com> [S390] cio: introduce consistent subchannel scanning

Previously, there were multiple subchannel scanning mechanisms
which could potentially conflict with each other. Fix this problem
by moving blacklist and ccw driver triggered scanning to the
existing evaluation method.

Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
b0a285d31bd475fdd4312e457288be558b705e55 22-Sep-2009 Sebastian Ott <sebott@linux.vnet.ibm.com> [S390] cio: idset use actual number of ssids

The functions idset_sch_new and for_each_subchannel_staged
use different values for the number of subchannel sets. Make
it consistent by changing idset_sch_new to also use the actual
number of subchannel sets.

Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
b827d1c8b65b27a293433e7c4723c7dfd6c4b848 22-Sep-2009 Sebastian Ott <sebott@linux.vnet.ibm.com> [S390] cio: dont kfree vmalloced memory

Don't use kfree to free memory allocated by vmalloc.

Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
8ea7f5590142c0b9ab319aa3cae85cf430a207d8 22-Sep-2009 Sebastian Ott <sebott@linux.vnet.ibm.com> [S390] cio: introduce css_settle

Introduce the css_driver callback settle which can be implemented
by a subchannel driver to wait for the subchannel type specific
asynchronous work to finish.
In channel_subsystem_init_sync we call that for each subchannel
driver.

Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
255305536c1b56ad09590f1400fb2c788265e34e 22-Sep-2009 Sebastian Ott <sebott@linux.vnet.ibm.com> [S390] cio: introduce css_eval_scheduled

Use css_eval_scheduled to determine if all scheduled subchannel
evaluation is finished. Wait for this value to be 0 in the
channel subsystem init function.

Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2f17644d1cd0121daa0a997ff4eca5b3b44d1fae 22-Sep-2009 Sebastian Ott <sebott@linux.vnet.ibm.com> [S390] cio: merge init calls

Define initialization sequence of css and ccw bus init calls by merging
them into a single init call. Also introduce channel_subsystem_init_sync
to wait for the initialization of devices to finish.

Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
a4dbd6740df0872cdf0a86841f75beec8381964d 24-Jun-2009 David Brownell <dbrownell@users.sourceforge.net> driver model: constify attribute groups

Let attribute group vectors be declared "const". We'd
like to let most attribute metadata live in read-only
sections... this is a start.

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
e86a6ed63f46fe8fb555fda531084bca3ef62fd7 11-Sep-2009 Heiko Carstens <heiko.carstens@de.ibm.com> [S390] Get rid of cpuid.h header file.

Merge cpuid.h header file into cpu.h.
While at it convert from typedef to struct declaration and also
convert cio code to use proper lowcore structure instead of casts.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
c6304933274f8e3cc6983d496456757ac8ab2e0b 11-Sep-2009 Sebastian Ott <sebott@linux.vnet.ibm.com> [S390] proper use of device register

Don't use kfree directly after device registration started.

Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
6ee4fec6be06f7d138860b37cba58982cc3ccb16 11-Sep-2009 Sebastian Ott <sebott@linux.vnet.ibm.com> [S390] cio: remove subchannel init_name

We used the init_name to set the console subchannels name early
at the boot stage. With the patch cio: fix memleak in subchannel validation
we moved the name setting to the point where we actually register the
console subchannel. At this time we can do dynamic allocations and therefore
use dev_set_name.

Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
ab6aae09024be1b039df441fa1b64dbe092d0acb 11-Sep-2009 Sebastian Ott <sebott@linux.vnet.ibm.com> [S390] cio: fix memleak in subchannel validation

When scanning for new subchannels we have a code path where we allocate
memory for a struct subchannel, set the device name (which is dynamically
allocated now) and do a check if the underlying device is blacklisted - if
so we free the subchannel structure.
Since we have not set up refcounting at this stage, the device name's memory
is lost. Fix this by moving the dev_set_name after the blacklist test.

Note: With this patch the init_name for the console subchannel becomes
virtually obsolete.

Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
1da73bc80bdfc9588192a6e6f5a72f8138f7378d 11-Sep-2009 Peter Oberparleiter <peter.oberparleiter@de.ibm.com> [S390] cio: consolidate subchannel intparm reset

Ensure that the hardware interruption parameter for a subchannel is
reset when the associated subchannel data structure is freed.

Signed-off-by: Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
dcbd16d5111258df7c821ec1e4124fe6ffbf3c16 16-Jun-2009 Sebastian Ott <sebott@linux.vnet.ibm.com> [S390] pm: css bus power management callbacks

Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
7b4684880dfc6c45bc56039ca5eada771d7643ab 26-Mar-2009 Martin Schwidefsky <schwidefsky@de.ibm.com> [S390] eliminate cpuinfo_S390 structure

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
56e25e9777bf15365293e27a3256eb9214a11edf 26-Mar-2009 Peter Oberparleiter <peter.oberparleiter@de.ibm.com> [S390] cio: prevent workqueue deadlock

Subchannel reprobing can block the kslowcrw workqueue indefinitely
while waiting for device recognition to finish which is also scheduled
to run on kslowcrw. Prevent this deadlock by moving the waiting
portion of subchannel reprobing to the cio workqueue.

Signed-off-by: Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
90ac24a5aeb8d4bef001bd3589564a52846d0eee 26-Mar-2009 Sebastian Ott <sebott@linux.vnet.ibm.com> [S390] cio: device scan oom fallback.

Since some callers rely on for_each_subchannel_staged to not fail,
fall back to brute force scanning using get_subchannel_by_schid in
case of a oom situation.

Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
f5daba1d4116d964435ddd99f32b6c80448a496b 26-Mar-2009 Heiko Carstens <heiko.carstens@de.ibm.com> [S390] split/move machine check handler code

Split machine check handler code and move it to cio and kernel code
where it belongs to. No functional change.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
f67f129e519fa87f8ebd236b6336fe43f31ee141 01-Mar-2009 Ming Lei <tom.leiming@gmail.com> Driver core: implement uevent suppress in kobject

This patch implements uevent suppress in kobject and removes it
from struct device, based on the following ideas:

1,Uevent sending should be one attribute of kobject, so suppressing it
in kobject layer is more natural than in device layer. By this way,
we can do it for other objects embedded with kobject.

2,It may save several bytes for each instance of struct device.(On my
omap3(32bit ARM) based box, can save 8bytes per device object)

This patch also introduces dev_set|get_uevent_suppress() helpers to
set and query uevent_suppress attribute in case to help kobject
as private part of struct device in future.

[This version is against the latest driver-core patch set of Greg,please
ignore the last version.]

Signed-off-by: Ming Lei <tom.leiming@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
e6d5a428e01b1387852f17b3dd7934239a0be0d4 25-Dec-2008 Michael Ernst <mernst@de.ibm.com> [S390] convert cio printks to pr_xxx macros.

Signed-off-by: Michael Ernst <mernst@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
13952ec12dfeea793ff83c2a96139ed57eb0b897 25-Dec-2008 Sebastian Ott <sebott@linux.vnet.ibm.com> [S390] cio: introduce cio_commit_config

To change the configuration of a subchannel we alter the modifiable
bits of the subchannel's schib field and issue a modify subchannel.
There can be the case that not all changes were applied -or worse-
quietly overwritten by the hardware. With the next store subchannel
we obtain the current state of the hardware but lose our target
configuration.

With this patch we introduce a subchannel_config structure which
contains the target subchannel configuration. Additionally the msch
wrapper cio_modify is replaced with cio_commit_config which
copies the desired changes to a temporary schib. msch is then
called with the temporary schib. This schib is only written back
to the subchannel if all changes were applied.

Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
1bf5b2853925cf92bfc5f0eddb68a8ed18782845 10-Oct-2008 Cornelia Huck <cornelia.huck@de.ibm.com> [S390] bus_id -> dev_set_name() changes

Convert most s390 users setting bus_id to dev_set_name().
css and ccw busses are deferred since they need some special
treatment.

Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
a2164b8174f13b7315c3f45c0b48dec619285096 09-Sep-2008 Cornelia Huck <cornelia.huck@de.ibm.com> [S390] cio: Correct cleanup on error.

Fix cleanup on error in chp_new() and init_channel_subsystem()
(must not call kfree() on structures that had been registered).

Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
91c36919a456589f4f073671474a1f899e0d3c2b 21-Aug-2008 Peter Oberparleiter <peter.oberparleiter@de.ibm.com> [S390] cio: call ccw driver notify function with lock held

Calling a ccw driver's notify function without the ccw device lock
held opens up a race window between discovery and handling of a change
in the device operational state. As a result, the device driver may
encounter unexpected device malfunction, leading to out-of-retry
situations or similar.

Remove race by extending the ccw device lock from state change
discovery to the calling of the notify function.

Signed-off-by: Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
ef60cd13ecee0ccf2439d63013cbfc798aea2bb9 14-Jul-2008 Sebastian Ott <sebott@linux.vnet.ibm.com> [S390] cio: fix double unregistering of subchannels

In some cases where the channel subsystem decides to drop a subchannel
device device_unregister may be called twice, which results in an oops.
The patch prevents this by only unregistering registered devices.

Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
f08adc008d84f6b03d377ede951e29ed169e76e2 14-Jul-2008 Cornelia Huck <cornelia.huck@de.ibm.com> [S390] css: Use css_device_id for bus matching.

css_device_id exists, so use it for determining the right driver
(and add a match_flags which is always 1 for valid types).

Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
6ef556ccc8fd256259745c4f0d0ab65aaf703824 14-Jul-2008 Cornelia Huck <cornelia.huck@de.ibm.com> [S390] cio: Use isc_{register,unregister}.

Use the new isc registration functions for all places that need
an I/O interruption subclass.

Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
3a3fc29a6d0626fb4897b7391c4e956efbacd394 14-Jul-2008 Cornelia Huck <cornelia.huck@de.ibm.com> [S390] cio: Introduce abstract isc definitions.

Replace the numeric values for I/O interruption subclass usage
with abstract definitions and collect them all in asm/isc.h.
This gives us a better overview of which iscs are actually used
and makes it possible to better spread out isc usage in the
future.

Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
75784c00876c88ca6e955c39cbb5d47cf408fd3c 14-Jul-2008 Cornelia Huck <cornelia.huck@de.ibm.com> [S390] cio: Get rid of css_characteristics_avail.

Checking for the validity of the css_*_characteristics is
superfluous since they stay 0 for non-successful scsc.

Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
b3a686f47a3615fcfec0a01c4103c50bb9621369 14-Jul-2008 Cornelia Huck <cornelia.huck@de.ibm.com> [S390] cio: Base message subchannel handling.

Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
44a1c19e3b47a7ac596808177ccd250b95f5e688 14-Jul-2008 Cornelia Huck <cornelia.huck@de.ibm.com> [S390] cio: Export some symbols for modular css drivers.

Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
c11561897ab57a3c11e0a284ba17795d580589ab 14-Jul-2008 Cornelia Huck <cornelia.huck@de.ibm.com> [S390] cio: Cleanup crw interface.

Eliminate the need for the machine check handler to call into
the common I/O layer directly by introducing an interface to
register handlers for crws per rsc.

Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
c820de39bd083222f5be2563181c87493e436f7c 14-Jul-2008 Cornelia Huck <cornelia.huck@de.ibm.com> [S390] cio: Rework css driver.

Rework the css driver methods to provide sane callbacks for
subchannels of all types.

As a bonus, this cleans up and simplyfies the machine check
handling for I/O subchannels a lot.

Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
7e9db9eaefdb8798730790214ff1b7746006ec98 14-Jul-2008 Cornelia Huck <cornelia.huck@de.ibm.com> [S390] cio: Introduce modalias for css bus.

Add modalias and subchannel type attributes for all subchannels.
I/O subchannel specific attributes are now created in
io_subchannel_probe(). modalias and subchannel type are also
added to the uevent for the css bus. Also make the css modalias
known.

Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
0ae7a7b250bdf7ee87c8346164ef3c47fb79dfbd 14-Jul-2008 Cornelia Huck <cornelia.huck@de.ibm.com> [S390] cio: Register all subchannels.

Register all valid subchannels, not only I/O subchannels.
Move I/O subchannel specific initialization to io_subchannel_probe().

Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
139b83dd57248a3c8fcfb256e562311ad61478e9 07-May-2008 Michael Ernst <mernst@de.ibm.com> [S390] cio: Remove cio_msg kernel parameter.

The only sporadically used CIO_DEBUG messages are replaced by ordinary
CIO_MSG_EVENT messages. The CIO_MSG_EVENT messages debug levels are
consolidated.

Signed-off-by: Michael Ernst <mernst@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2f972202315cf71fd60e890ebbed7d5bcf620ba4 30-Apr-2008 Cornelia Huck <cornelia.huck@de.ibm.com> [S390] cio: Use strict_strtoul() for attributes.

Make parsing of attribute writes handle incorrect input better.

Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
8284fb19efa1f11ea8dd213e9e227fc1fcb20586 17-Apr-2008 Michael Ernst <mernst@de.ibm.com> [S390] cio: fix parallel cm_enable processing.

It is now possible to trigger cm_enable processing several times in
parallel without causing a kernel panic.

Signed-off-by: Michael Ernst <mernst@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
22806dc1a8ffd88a7c7bdd070879e6e323db496a 17-Apr-2008 Cornelia Huck <cornelia.huck@de.ibm.com> [S390] cio: Fix race for "fast" path gone/path back situations.

Make sure we wait for previous evaluations triggered by path state
changes to have settled before we manipulate path states again.

Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
e82a1567e4b22eb035da2499d20ddd573c9acf75 26-Jan-2008 Peter Oberparleiter <peter.oberparleiter@de.ibm.com> [S390] cio: reduce cpu utilization during device scan

Minimize calls to cpu intensive function get_subchannel_by_schid()
by introducing function for_each_subchannel_staged() which
temporarily caches the information about registered subchannels
in a bitmap.

Signed-off-by: Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
4beee64685e116b01c47655daf6d88df87e053c8 26-Jan-2008 Cornelia Huck <cornelia.huck@de.ibm.com> [S390] cio: Set driver->owner on css, ccw and ccwgroup busses.

Set the owner field in the embedded struct device_driver to the
value provided in the {css,ccw,ccwgroup}_driver.

Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
b279a4f56d5476a0b9b0a97397f7a7bbe00b9b2f 26-Jan-2008 Cornelia Huck <cornelia.huck@de.ibm.com> [S390] cio: I/O subchannel specific fields.

Some fields may be !0 only for I/O subchannels. Add some checks
where required. Also adapt cio_enable_subchannel() to make the
caller specify the intparm, which makes it more generic.

Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
cd6b4f27b9bb2a6a5ec82b96b87c85421257be6c 26-Jan-2008 Cornelia Huck <cornelia.huck@de.ibm.com> [S390] cio: Introduce subchannel->private.

Introduce a private pointer in struct subchannel to store
per-subchannel type data (cannot use dev->priv since this
is already used for something else).

Create a new header io_sch.h for I/O subchannel specific structures
and instructions.

Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
25b7bb5838ab81b68a9de72df577103d8b4aba3c 26-Jan-2008 Cornelia Huck <cornelia.huck@de.ibm.com> [S390] cio: Add css_driver_{register,unregister}.

Add wrapper functions for driver_register and driver_unregister so
that css drivers don't need to muck with struct device_driver
directly.

Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
98c13c283a4e8b7f844f1f470abd7c756248fcc4 26-Jan-2008 Cornelia Huck <cornelia.huck@de.ibm.com> [S390] cio: Reset sch->driver.

sch->driver needs to be reset to NULL on failed probe and after
remove. We also need to check for sch->driver on shutdown.

Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
602b20f2bf335d0d5fce11cb2ade22aa74e7ba25 26-Jan-2008 Cornelia Huck <cornelia.huck@de.ibm.com> [S390] cio: css_driver: Use consistent parameters.

Make all callbacks in css_driver take a struct subchannel (and not
a struct device).

Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
084325d80418adf4d75b10a9ceff1348f2e09163 26-Jan-2008 Cornelia Huck <cornelia.huck@de.ibm.com> [S390] cio: Use helpers instead of container_of().

- Introduce to_cssdriver.
- Use to_xxx instead of container_of where possible.

Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
671756162cfb0b3ccbb6a0047baa3010885561a2 04-Dec-2007 Peter Oberparleiter <peter.oberparleiter@de.ibm.com> [S390] cio: add missing reprobe loop end statement

Add loop end statement to prevent looping over empty subchannel sets.

Signed-off-by: Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
c5d4a9997b4b2ec71cff0b219f05c6bc51f3fc79 20-Nov-2007 Cornelia Huck <cornelia.huck@de.ibm.com> [S390] cio: Register/unregister subchannels only from kslowcrw.

Make sure all subchannel handling is done on the slow path workqueue
so that we don't have races between an old subchannel unregistering
and a new subchannel with the same name registering.

Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
5bf04b2062c5b441d7154216694fea7dc2a6a7f3 22-Oct-2007 Cornelia Huck <cornelia.huck@de.ibm.com> [S390] cio: Fix incomplete commit for uevent suppression.

Commit fa1a8c23eb7d3ded8a3c6d0e653339a2bc7fca9e intended to
introduce uevent suppression for subchannels, but half of it was
lost somewhere. Now, we end up with two uevents for every registered
subchannel :( So we should better add the missing part from
http://marc.info/?l=linux-kernel&m=117515953113974&w=2.

Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
a55360df406cca797ac07d722688dd7ec29bf46e 12-Oct-2007 Cornelia Huck <cornelia.huck@de.ibm.com> [S390] cio: Disable channel path measurements on shutdown/reboot.

Make sure channel path measurements are disabled via a reboot notifier
since we cannot rely on userspace to disable it again after enabling
it. This is 1. clean and 2. makes sure that channel path measurements
do not stay enabled after a reboot not involving a subsystem reset
(which would lead to the channel subsystem scribbling onto random
memory).

Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
7c9f4e3aaae020fc674f52393cbac1bdb648bf90 12-Oct-2007 Cornelia Huck <cornelia.huck@de.ibm.com> [S390] cio: rename css to channel_subsystems

Rename css[] to channel_subsystems[] to avoid name clashes.

Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
5693ce6f9b9f08942e55e3825db014f8b1205772 10-Aug-2007 Cornelia Huck <cornelia.huck@de.ibm.com> [S390] cio: avoid memory leak on error in css_alloc_subchannel().

sch->lock has been allocated in cio_validate_subchannel(), it must be
freed if cio_modify() fails.

Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
4434a38c37dd30e5cd01456a136367a43d8da2dd 27-Jul-2007 Cornelia Huck <cornelia.huck@de.ibm.com> [S390] cio: Reorganize initialization.

- Localize more of the init calls in init_channel_subsystem().
- Print a warning if init_channel_subsystem() failed.

Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
e556bbbd9d2ff2b158915945ac82e2ac7def4d2f 27-Jul-2007 Cornelia Huck <cornelia.huck@de.ibm.com> [S390] cio: Clean up messages.

- Remove unneeded messages.
- Move some messages into the debug feature.
- Use dev_* where appropriate.
- Use "cio: " prefix consistently.

Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
07c6a3386d8c09e8d6c58274bd69f640dda15833 27-Jul-2007 Cornelia Huck <cornelia.huck@de.ibm.com> [S390] cio: css_sch_device_register() can be made static.

Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
f7e5d67c7928bfdbcdfd95a0b3d75122238e23e0 10-May-2007 Cornelia Huck <cornelia.huck@de.ibm.com> [S390] cio: Make some structures and a function static.

Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
7ad6a24970325294a22a08446d473384c15b928e 27-Apr-2007 Peter Oberparleiter <peter.oberparleiter@de.ibm.com> [S390] cio: fix subchannel channel-path data usage

Ensure that channel-path related subchannel data is only retrieved and
used when it is valid and that it is updated when it may have changed.

Signed-off-by: Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
83b3370c79b91b9be3f6540c3c914e689134b45f 27-Apr-2007 Peter Oberparleiter <peter.oberparleiter@de.ibm.com> [S390] cio: replace subchannel evaluation queue with bitmap

Use a bitmap for indicating which subchannels require evaluation
instead of allocating memory for each evaluation request. This
approach reduces memory consumption during recovery in case of
massive evaluation request occurrence and removes the need for
memory allocation failure handling.

Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
4d284cac76d0bfebc42d76b428c4e44d921200a9 05-Feb-2007 Heiko Carstens <heiko.carstens@de.ibm.com> [S390] Avoid excessive inlining.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
758976f9a55cb22ddc602a0690d67f9546e3e43f 05-Feb-2007 Cornelia Huck <cornelia.huck@de.ibm.com> [S390] cio: Catch operand exceptions on stsch.

If we have a subchannel id which has been generated via
for_each_subchannel(), it might contain an invalid subchannel set id.
We need to catch the ensuing operand exception by using stsch_err()
instead of stsch() in all possible cases.

Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2b67fc46061b2171fb8fbb55d1ac717abd533569 05-Feb-2007 Heiko Carstens <heiko.carstens@de.ibm.com> [S390] Get rid of a lot of sparse warnings.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
e42734e270b9e5ada83188d73b733533ce11ee4a 15-Dec-2006 Stefan Bader <shbader@de.ibm.com> [S390] cio: css_register_subchannel race.

Asynchronous probe can release memory of a subchannel before
css_get_ssd_info is called. To fix this call css_get_ssd_info
before registering with driver core.

Signed-off-by: Stefan Bader <shbader@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
529192f3b90682e37c5fcab461d968d062f1e0e4 08-Dec-2006 Cornelia Huck <cornelia.huck@de.ibm.com> [S390] Use dev->groups for adding/removing the subchannel attribute group.

Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Cc: Greg KH <greg@kroah.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
d7b5a4c94f49131811112526f7d404a50f0b5ca7 08-Dec-2006 Cornelia Huck <cornelia.huck@de.ibm.com> [S390] Support for disconnected devices reappearing on another subchannel.

- create a 'pseudo_subchannel' per channel subsystem (the 'orphanage')
- use the orphanage as a shelter for ccw_devices that can't remain on the same
subchannel

Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Cc: Greg KH <greg@kroah.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2ec2298412e1ab4674b3780005058d4f0b8bd858 08-Dec-2006 Cornelia Huck <cornelia.huck@de.ibm.com> [S390] subchannel lock conversion.

Convert the subchannel lock to a pointer to a lock. Needed for the dynamic
subchannel mapping patch.

Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Cc: Greg KH <greg@kroah.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
7674da77cb2d27ae6559c55151da171ceb02beb4 08-Dec-2006 Cornelia Huck <cornelia.huck@de.ibm.com> [S390] Some preparations for the dynamic subchannel mapping patch.

- Move adding subchannel attributes to css_register_subchannel().
- Don't call device_trigger_reprobe() for non-operational devices.
- Introduce io_subchannel_create_ccwdev().

Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Cc: Greg KH <greg@kroah.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
4927b3f74c6a2fd92226dcf1542a598be9738808 06-Dec-2006 Al Viro <viro@ftp.linux.org.uk> [PATCH] More work_struct induced breakage (s390)

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
c2b1449bd1fd73103ed5ff1a28d8f7cbc8a01b52 27-Oct-2006 Cornelia Huck <cornelia.huck@de.ibm.com> [S390] cio: css_probe_device() must be called enabled.

Move css_probe_device() behind giving up the lock for the old subchannel
in css_evaluate_known_subchannel() so we aren't disabled when we call it.

Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
12975aef62836e9f3e179afaaded8045f8a25ac4 11-Oct-2006 Cornelia Huck <cornelia.huck@de.ibm.com> [S390] cio: remove casts from/to (void *).

Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
564337f34cc10fd8f30329e4e5f14f8995db5711 20-Sep-2006 Peter Oberparleiter <peter.oberparleiter@de.ibm.com> [S390] cio: subchannel evaluation function operates without lock

css_evaluate_subchannel() operates subchannel without lock which can
lead to erratic behavior caused by concurrent device access. Also
split evaluation function to make it more readable.

Signed-off-by: Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
7e560814de1972e1bfc780616841d7a0032ca467 12-Jul-2006 Cornelia Huck <cornelia.huck@de.ibm.com> [S390] path grouping and path verifications fixes.

1. Multipath devices for which SetPGID is not supported are not handled well.
Use NOP ccws for path verification (sans path grouping) when SetPGID is not
supported.
2. Check for PGIDs already set with SensePGID on _all_ paths (not just the
first one) and try to find a common one. Moan if no common PGID can be
found (and use NOP verification). If no PGIDs have been set, use the css
global PGID (as before). (Rationale: SetPGID will get a command reject if
the PGID it tries to set does not match the already set PGID.)
3. Immediately before reboot, issue RESET CHANNEL PATH (rcp) on all chpids. This
will remove the old PGIDs. rcp will generate solicited CRWs which can be
savely ignored by the machine check handler (all other actions create
unsolicited CRWs).

Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
6ab4879a0d074c938fd17dba141dce042fc17bee 12-Jul-2006 Cornelia Huck <cornelia.huck@de.ibm.com> [S390] subchannel register/unregister mutex.

Add a reg_mutex to prevent unregistering a subchannel before it has been
registered. Since 2.6.17, we've seen oopses in kslowcrw when a device is
found to be not operational during sense id when doing initial device
recognition; it is not clear yet why that particular problem was not (yet)
observed with earlier kernels...

Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
40154b824331cd9c81c06545761338f3d80a36e2 29-Jun-2006 Peter Oberparleiter <peter.oberparleiter@de.ibm.com> [S390] cio async subchannel reprobe.

Changes in the DASD driver require an asynchronous implementation of the
subchannel reprobe loop. This loop was so far only used by the blacklisting
mechanism but is now available to all CCW device drivers.

Signed-off-by: Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
88abaab4f9b08381e30e737980a1c49d6b524dfc 24-Mar-2006 Eric Sesterhenn <snakebyte@gmx.de> [PATCH] s390: kzalloc() conversion in drivers/s390

Convert all kmalloc + memset sequences in drivers/s390 to kzalloc usage.

Signed-off-by: Eric Sesterhenn <snakebyte@gmx.de>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
495a5b45ac33b8fe2c49780fdbcc8014cb6d6ddc 24-Mar-2006 Cornelia Huck <cornelia.huck@de.ibm.com> [PATCH] s390: channel path measurements

Gather extended measurements for channel paths from the channel subsystem and
expose them to userspace via a sysfs attribute.

Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
e843e280cbe218fc8387339806d344708dee348a 15-Mar-2006 Greg Smith <gsmith@nc.rr.com> [PATCH] "s390: multiple subchannel sets support" fix

It seems this patch got dropped (it was in addition to the `s390:
improve response code handling in chsc_enable_facility()' patch).

Acked-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
e018ba1fceee5bd306e31f6e3a60934d5f143ac5 01-Feb-2006 Heiko Carstens <heiko.carstens@de.ibm.com> [PATCH] s390: Remove CVS generated information

- Remove all CVS generated information like e.g. revision IDs from
drivers/s390 and include/asm-s390 (none present in arch/s390).

- Add newline at end of arch/s390/lib/Makefile to avoid diff message.

Acked-by: Andreas Herrmann <aherrman@de.ibm.com>
Acked-by: Frank Pavlic <pavlic@de.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
4ce3b30cf32c5c078518f0f3e6623bcb6eee9872 14-Jan-2006 Cornelia Huck <cornelia.huck@de.ibm.com> [PATCH] s390: email-address change

Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
8bbace7e686f1536905c703038a7eddfb1520264 11-Jan-2006 Cornelia Huck <huckc@de.ibm.com> [PATCH] Add {css,ccw}_bus_type probe, remove, shutdown methods.

The following patch converts css_bus_type and ccw_bus_type to use
the new bus_type methods.

Signed-off-by: Cornelia Huck <huckc@de.ibm.com>
CC: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
3b793060e768197d525e892fd1f84dbc8767cada 06-Jan-2006 Cornelia Huck <huckc@de.ibm.com> [PATCH] s390: Fix missing release function and cosmetic changes

- Use kzalloc() in blacklist.c.
- Kill unwanted casts in blacklist.c.
- Provide release function for struct channel_subsystem.

Signed-off-by: Cornelia Huck <huckc@de.ibm.com>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
fb6958a594da49ece869793e6ec163b89fc5f79f 06-Jan-2006 Cornelia Huck <cohuck@de.ibm.com> [PATCH] s390: multiple subchannel sets support

Add support for multiple subchannel sets. Works with arbitrary devices in
subchannel set 1 and is transparent to device drivers. Although currently
only two subchannel sets are available, this will work with the architectured
maximum number of subchannel sets as well.

Signed-off-by: Cornelia Huck <cohuck@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
a28c69448154a0901e8815922030c5dcd2f8e388 06-Jan-2006 Cornelia Huck <cohuck@de.ibm.com> [PATCH] s390: introduce struct channel_subsystem

struct channel_subsystem encapsulates several per channel subsystem
properties, like status of chpids or the global path group id.

Signed-off-by: Cornelia Huck <cohuck@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
f97a56fb768e5fe9cd07c56ca47870136bb5530c 06-Jan-2006 Cornelia Huck <cohuck@de.ibm.com> [PATCH] s390: introduce for_each_subchannel

for_each_subchannel() is an iterator calling a function for every possible
subchannel id until non-zero is returned. Convert the current iterating
functions to it.

Signed-off-by: Cornelia Huck <cohuck@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
a8237fc4108060402d904bea5e1062e22e731969 06-Jan-2006 Cornelia Huck <cohuck@de.ibm.com> [PATCH] s390: introduce struct subchannel_id

This patch introduces a struct subchannel_id containing the subchannel number
(formerly referred to as "irq") and switches code formerly relying on the
subchannel number over to it.

While we're touching inline assemblies anyway, make sure they have correct
memory constraints.

Signed-off-by: Cornelia Huck <cohuck@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
cfb1b55595a0dfd87b5849e8d0216c029f34445f 06-Jan-2006 Carsten Otte <cotte@de.ibm.com> [PATCH] s390: move s390_root_dev_* out of the cio layer

Extract the s390_root_dev_* functions from the common I/O layer as they are
also used by non-ccw device drivers.

Signed-off-by: Carsten Otte <cotte@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
b0744bd2925a4a24865963322534107d2ad553f9 25-Jun-2005 Cornelia Huck <cohuck@de.ibm.com> [PATCH] s/390: Use klist in cio

Convert the common I/O layer to use the klist interfaces.

This patch has been adapted from the previous version to the changed interface
semantics. Also, gcc 4.0 compile warnings have been removed.

Signed-off-by: Cornelia Huck <cohuck@de.ibm.com>
Cc: Greg KH <greg@kroah.com>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 17-Apr-2005 Linus Torvalds <torvalds@ppc970.osdl.org> Linux-2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!