PCI: shpchp: Remove hpc_ops

Remove the hpc_ops struct from shpchp. This struct is unnecessary and no
other hotplug controller implements it. A similar thing has already been
done in pciehp with 82a9

PCI: shpchp: Remove hpc_ops

Remove the hpc_ops struct from shpchp. This struct is unnecessary and no
other hotplug controller implements it. A similar thing has already been
done in pciehp with 82a9e79ef132 ("PCI: pciehp: remove hpc_ops").

Link: https://lore.kernel.org/r/Zp-XXVW4hlcMASEc@archbtw
Signed-off-by: ngn <[email protected]>
Signed-off-by: Bjorn Helgaas <[email protected]>

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PCI: shpchp: Remove unused 'rc' assignment

The value of the constant POWER_FAILURE assigned to the variable rc
after the power fault check is never used for anything, so remove it.

Addresses-Coveri

PCI: shpchp: Remove unused 'rc' assignment

The value of the constant POWER_FAILURE assigned to the variable rc
after the power fault check is never used for anything, so remove it.

Addresses-Coverity-ID: 1226899 ("Unused value")
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Krzysztof Wilczyński <[email protected]>
Signed-off-by: Bjorn Helgaas <[email protected]>

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treewide: Use fallthrough pseudo-keyword

Replace the existing /* fall through */ comments and its variants with
the new pseudo-keyword macro fallthrough[1]. Also, remove unnecessary
fall-through mar

treewide: Use fallthrough pseudo-keyword

Replace the existing /* fall through */ comments and its variants with
the new pseudo-keyword macro fallthrough[1]. Also, remove unnecessary
fall-through markings when it is the case.

[1] https://www.kernel.org/doc/html/v5.7/process/deprecated.html?highlight=fallthrough#implicit-switch-case-fall-through

Signed-off-by: Gustavo A. R. Silva <[email protected]>

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PCI: shpchp: Make shpchp_unconfigure_device() void

shpchp_unconfigure_device() always returned 0, so there's no reason for a
return value. In addition, remove_board() checked the return value for
p

PCI: shpchp: Make shpchp_unconfigure_device() void

shpchp_unconfigure_device() always returned 0, so there's no reason for a
return value. In addition, remove_board() checked the return value for
possible error which is unnecessary.

Convert shpchp_unconfigure_device() to a void function and remove the
return value check. This addresses the following Coccinelle warning:

drivers/pci/hotplug/shpchp_pci.c:66:5-7: Unneeded variable: "rc". Return "0" on line 86

Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Krzysztof Wilczynski <[email protected]>
Signed-off-by: Bjorn Helgaas <[email protected]>

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PCI: hotplug: Drop hotplug_slot_info

Ever since the PCI hotplug core was introduced in 2002, drivers had to
allocate and register a struct hotplug_slot_info for every slot:
https://git.kernel.org/tg

PCI: hotplug: Drop hotplug_slot_info

Ever since the PCI hotplug core was introduced in 2002, drivers had to
allocate and register a struct hotplug_slot_info for every slot:
https://git.kernel.org/tglx/history/c/a8a2069f432c

Apparently the idea was that drivers furnish the hotplug core with an
up-to-date card presence status, power status, latch status and
attention indicator status as well as notify the hotplug core of changes
thereof. However only 4 out of 12 hotplug drivers bother to notify the
hotplug core with pci_hp_change_slot_info() and the hotplug core never
made any use of the information: There is just a single macro in
pci_hotplug_core.c, GET_STATUS(), which uses the hotplug_slot_info if
the driver lacks the corresponding callback in hotplug_slot_ops. The
macro is called when the user reads the attribute via sysfs.

Now, if the callback isn't defined, the attribute isn't exposed in sysfs
in the first place (see e.g. has_power_file()). There are only two
situations when the hotplug_slot_info would actually be accessed:

* If the driver defines ->enable_slot or ->disable_slot but not
->get_power_status.

* If the driver defines ->set_attention_status but not
->get_attention_status.

There is no driver doing the former and just a single driver doing the
latter, namely pnv_php.c. Amend it with a ->get_attention_status
callback. With that, the hotplug_slot_info becomes completely unused by
the PCI hotplug core. But a few drivers use it internally as a cache:

cpcihp uses it to cache the latch_status and adapter_status.
cpqhp uses it to cache the adapter_status.
pnv_php and rpaphp use it to cache the attention_status.
shpchp uses it to cache all four values.

Amend these drivers to cache the information in their private slot
struct. shpchp's slot struct already contains members to cache the
power_status and adapter_status, so additional members are only needed
for the other two values. In the case of cpqphp, the cached value is
only accessed in a single place, so instead of caching it, read the
current value from the hardware.

Caution: acpiphp, cpci, cpqhp, shpchp, asus-wmi and eeepc-laptop
populate the hotplug_slot_info with initial values on probe. That code
is herewith removed. There is a theoretical chance that the code has
side effects without which the driver fails to function, e.g. if the
ACPI method to read the adapter status needs to be executed at least
once on probe. That seems unlikely to me, still maintainers should
review the changes carefully for this possibility.

Rafael adds: "I'm not aware of any case in which it will break anything,
[...] but if that happens, it may be necessary to add the execution of
the control methods in question directly to the initialization part."

Signed-off-by: Lukas Wunner <[email protected]>
Signed-off-by: Bjorn Helgaas <[email protected]>
Reviewed-by: Rafael J. Wysocki <[email protected]>
Acked-by: Tyrel Datwyler <[email protected]> # drivers/pci/hotplug/rpa*
Acked-by: Sebastian Ott <[email protected]> # drivers/pci/hotplug/s390*
Acked-by: Andy Shevchenko <[email protected]> # drivers/platform/x86
Cc: Len Brown <[email protected]>
Cc: Scott Murray <[email protected]>
Cc: Benjamin Herrenschmidt <[email protected]>
Cc: Paul Mackerras <[email protected]>
Cc: Michael Ellerman <[email protected]>
Cc: Oliver OHalloran <[email protected]>
Cc: Gavin Shan <[email protected]>
Cc: Gerald Schaefer <[email protected]>
Cc: Corentin Chary <[email protected]>
Cc: Darren Hart <[email protected]>

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PCI: Mark fall-through switch cases before enabling -Wimplicit-fallthrough

In preparation to enabling -Wimplicit-fallthrough, mark switch cases where
we are expecting to fall through.

Warning level

PCI: Mark fall-through switch cases before enabling -Wimplicit-fallthrough

In preparation to enabling -Wimplicit-fallthrough, mark switch cases where
we are expecting to fall through.

Warning level 2 was used: -Wimplicit-fallthrough=2

Signed-off-by: Gustavo A. R. Silva <[email protected]>
Signed-off-by: Bjorn Helgaas <[email protected]>

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PCI: shpchp: Fix AMD POGO identification

The fix for an AMD POGO erratum related to SHPC incorrectly identified the
device. The workaround should be applied only for AMD POGO devices, but it
was in

PCI: shpchp: Fix AMD POGO identification

The fix for an AMD POGO erratum related to SHPC incorrectly identified the
device. The workaround should be applied only for AMD POGO devices, but it
was instead applied to:

- all AMD bridges, and
- all devices from any vendor with device ID 0x7458

Fixes: 53044f357448 ("[PATCH] PCI Hotplug: shpchp: AMD POGO errata fix")
Signed-off-by: Bjorn Helgaas <[email protected]>
Reviewed-by: Mika Westerberg <[email protected]>
Reviewed-by: Rafael J. Wysocki <[email protected]>

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PCI: Add SPDX GPL-2.0+ to replace GPL v2 or later boilerplate

Add SPDX GPL-2.0+ to all PCI files that specified the GPL and allowed
either GPL version 2 or any later version.

Remove the boilerplate

PCI: Add SPDX GPL-2.0+ to replace GPL v2 or later boilerplate

Add SPDX GPL-2.0+ to all PCI files that specified the GPL and allowed
either GPL version 2 or any later version.

Remove the boilerplate GPL version 2 or later language, relying on the
assertion in b24413180f56 ("License cleanup: add SPDX GPL-2.0 license
identifier to files with no license") that the SPDX identifier may be used
instead of the full boilerplate text.

Signed-off-by: Bjorn Helgaas <[email protected]>
Reviewed-by: Greg Kroah-Hartman <[email protected]>

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PCI: Remove assignment from "if" conditions

The following Coccinelle semantic patch was used to find and correct cases
of assignments in "if" conditions:

@@
expression var, expr;
statement S;
@@

+

PCI: Remove assignment from "if" conditions

The following Coccinelle semantic patch was used to find and correct cases
of assignments in "if" conditions:

@@
expression var, expr;
statement S;
@@

+ var = expr;
if(
- (var = expr)
+ var
) S

Signed-off-by: Quentin Lambert <[email protected]>
Signed-off-by: Bjorn Helgaas <[email protected]>

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PCI: Add space before open parenthesis

Add space before open parenthesis as is conventional.

No functional change.

[bhelgaas: fix a few more in ibmphp, shpchp]
Signed-off-by: Quentin Lambert <lamb

PCI: Add space before open parenthesis

Add space before open parenthesis as is conventional.

No functional change.

[bhelgaas: fix a few more in ibmphp, shpchp]
Signed-off-by: Quentin Lambert <[email protected]>
Signed-off-by: Bjorn Helgaas <[email protected]>

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PCI: Merge multi-line quoted strings

Merge quoted strings that are broken across lines into a single entity.
The compiler merges them anyway, but checkpatch complains about it, and
merging them make

PCI: Merge multi-line quoted strings

Merge quoted strings that are broken across lines into a single entity.
The compiler merges them anyway, but checkpatch complains about it, and
merging them makes it easier to grep for strings.

No functional change.

[bhelgaas: changelog, do the same for everything under drivers/pci]
Signed-off-by: Ryan Desfosses <[email protected]>
Signed-off-by: Bjorn Helgaas <[email protected]>

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PCI: Whitespace cleanup

Fix various whitespace errors.

No functional change.

[bhelgaas: fix other similar problems]
Signed-off-by: Ryan Desfosses <[email protected]>
Signed-off-by: Bjorn Helgaas <bhe

PCI: Whitespace cleanup

Fix various whitespace errors.

No functional change.

[bhelgaas: fix other similar problems]
Signed-off-by: Ryan Desfosses <[email protected]>
Signed-off-by: Bjorn Helgaas <[email protected]>

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PCI: shpchp: Check bridge's secondary (not primary) bus speed

When a new device is added below a hotplug bridge, the bridge's secondary
bus speed and the device's bus speed must match. The shpchp d

PCI: shpchp: Check bridge's secondary (not primary) bus speed

When a new device is added below a hotplug bridge, the bridge's secondary
bus speed and the device's bus speed must match. The shpchp driver
previously checked the bridge's *primary* bus speed, not the secondary bus
speed.

This caused hot-add errors like:

shpchp 0000:00:03.0: Speed of bus ff and adapter 0 mismatch

Check the secondary bus speed instead.

[bhelgaas: changelog]
Link: https://bugzilla.kernel.org/show_bug.cgi?id=75251
Fixes: 3749c51ac6c1 ("PCI: Make current and maximum bus speeds part of the PCI core")
Signed-off-by: Marcel Apfelbaum <[email protected]>
Signed-off-by: Bjorn Helgaas <[email protected]>
Acked-by: Michael S. Tsirkin <[email protected]>
CC: [email protected] # v2.6.34+

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PCI: shpchp: Use per-slot workqueues to avoid deadlock

When we have an SHPC-capable bridge with a second SHPC-capable bridge
below it, pushing the upstream bridge's attention button causes a
deadloc

PCI: shpchp: Use per-slot workqueues to avoid deadlock

When we have an SHPC-capable bridge with a second SHPC-capable bridge
below it, pushing the upstream bridge's attention button causes a
deadlock.

The deadlock happens because we use the shpchp_wq workqueue to run
shpchp_pushbutton_thread(), which uses shpchp_disable_slot() to remove
devices below the upstream bridge. When we remove the downstream bridge,
we call shpc_remove(), the shpchp driver's .remove() method. That calls
flush_workqueue(shpchp_wq), which deadlocks because the
shpchp_pushbutton_thread() work item is still running.

This patch avoids the deadlock by creating a workqueue for every slot
and removing the single shared workqueue.

Here's the call path that leads to the deadlock:

shpchp_queue_pushbutton_work
queue_work(shpchp_wq) # shpchp_pushbutton_thread
...

shpchp_pushbutton_thread
shpchp_disable_slot
remove_board
shpchp_unconfigure_device
pci_stop_and_remove_bus_device
...
shpc_remove # shpchp driver .remove method
hpc_release_ctlr
cleanup_slots
flush_workqueue(shpchp_wq)

This change is based on code inspection, since we don't have hardware
with this topology.

Based-on-patch-by: Yijing Wang <[email protected]>
Signed-off-by: Bjorn Helgaas <[email protected]>
CC: [email protected]

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PCI: shpchp: Handle push button event asynchronously

Use non-ordered workqueue for attention button events.

Attention button events on each slot can be handled asynchronously. So
we should use non-

PCI: shpchp: Handle push button event asynchronously

Use non-ordered workqueue for attention button events.

Attention button events on each slot can be handled asynchronously. So
we should use non-ordered workqueue. This patch also removes ordered
workqueue in shpchp as a result.

486b10b9f4 ("PCI: pciehp: Handle push button event asynchronously") made
the same change to pciehp. I split this out from a patch by Yijing Wang
<[email protected]> so we fix one thing at a time and to make the
shpchp history correspond more closely with the pciehp history.

Signed-off-by: Bjorn Helgaas <[email protected]>
CC: Kenji Kaneshige <[email protected]>

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PCI: shpchp: remove dead code

"slots_not_empty" is initialized to zero and can't be set again before
reaching this point, so this return statement is dead. Remove it.

Found by Coverity (CID 114324

PCI: shpchp: remove dead code

"slots_not_empty" is initialized to zero and can't be set again before
reaching this point, so this return statement is dead. Remove it.

Found by Coverity (CID 114324).

Signed-off-by: Bjorn Helgaas <[email protected]>

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shpchp: update workqueue usage

* Rename shpchp_wq to shpchp_ordered_wq and add non-ordered shpchp_wq
which is used instead of the system workqueue. This is to remove
the use of flush_scheduled_

shpchp: update workqueue usage

* Rename shpchp_wq to shpchp_ordered_wq and add non-ordered shpchp_wq
which is used instead of the system workqueue. This is to remove
the use of flush_scheduled_work() which is deprecated and scheduled
for removal.

* With cmwq in place, there's no point in creating workqueues lazily.
Create both shpchp_wq and shpchp_ordered_wq upfront.

* Include workqueue.h from shpchp.h.

Signed-off-by: Tejun Heo <[email protected]>
Acked-by: Jesse Barnes <[email protected]>

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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 bu

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 <[email protected]>
Guess-its-ok-by: Christoph Lameter <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Lee Schermerhorn <[email protected]>

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PCI hotplug: fix memory leaks

Stanse found a cut&pasted memory leak in pciehp_queue_pushbutton_work
and shpchp_queue_pushbutton_work. info is not freed/assigned on all
paths. Fix that.

Reviewed-by:

PCI hotplug: fix memory leaks

Stanse found a cut&pasted memory leak in pciehp_queue_pushbutton_work
and shpchp_queue_pushbutton_work. info is not freed/assigned on all
paths. Fix that.

Reviewed-by: Kenji Kaneshige <[email protected]>
Signed-off-by: Jiri Slaby <[email protected]>
Signed-off-by: Jesse Barnes <[email protected]>

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PCI: Make current and maximum bus speeds part of the PCI core

Move the max_bus_speed and cur_bus_speed into the pci_bus. Expose the
values through the PCI slot driver instead of the hotplug slot dr

PCI: Make current and maximum bus speeds part of the PCI core

Move the max_bus_speed and cur_bus_speed into the pci_bus. Expose the
values through the PCI slot driver instead of the hotplug slot driver.
Update all the hotplug drivers to use the pci_bus instead of their own
data structures.

Signed-off-by: Matthew Wilcox <[email protected]>
Signed-off-by: Jesse Barnes <[email protected]>

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PCI hotplug: shpchp: message refinement

This patch refines messages in shpchp module. The main changes are as
follows:

- remove the trailing "."
- remove __func__ as much as possible
- capitali

PCI hotplug: shpchp: message refinement

This patch refines messages in shpchp module. The main changes are as
follows:

- remove the trailing "."
- remove __func__ as much as possible
- capitalize the first letter of messages
- show PCI device address including its domain

Signed-off-by: Taku Izumi <[email protected]>
Signed-off-by: Jesse Barnes <[email protected]>

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PCI hotplug: shpchp: replace printk with dev_printk

This patch replaces printks within shpchp module with dev_printks.

Signed-off-by: Taku Izumi <[email protected]>
Signed-off-by: Jesse Bar

PCI hotplug: shpchp: replace printk with dev_printk

This patch replaces printks within shpchp module with dev_printks.

Signed-off-by: Taku Izumi <[email protected]>
Signed-off-by: Jesse Barnes <[email protected]>

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PCI: shcphp: remove 'name' parameter

We do not need to manage our own name parameter, especially since
the PCI core can change it on our behalf, in the case of duplicate
slot names.

Remove 'name' f

PCI: shcphp: remove 'name' parameter

We do not need to manage our own name parameter, especially since
the PCI core can change it on our behalf, in the case of duplicate
slot names.

Remove 'name' from shpchp's version of struct slot.

This change also removes the unused struct task_event from the
slot structure.

Cc: [email protected]
Acked-by: Kenji Kaneshige <[email protected]>
Signed-off-by: Alex Chiang <[email protected]>
Signed-off-by: Jesse Barnes <[email protected]>

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PCI: replace remaining __FUNCTION__ occurrences

__FUNCTION__ is gcc-specific, use __func__

Signed-off-by: Harvey Harrison <[email protected]>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.

PCI: replace remaining __FUNCTION__ occurrences

__FUNCTION__ is gcc-specific, use __func__

Signed-off-by: Harvey Harrison <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>

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pci hotplug: kernel-doc fixes

acpiphp.h: not using kernel-doc, so change /** to /*
acpiphp_core.c: lots of kernel-doc cleanups
acpiphp_glue.c: lots of kernel-doc cleanups
acpiphp_ibm.c: lots of kern

pci hotplug: kernel-doc fixes

acpiphp.h: not using kernel-doc, so change /** to /*
acpiphp_core.c: lots of kernel-doc cleanups
acpiphp_glue.c: lots of kernel-doc cleanups
acpiphp_ibm.c: lots of kernel-doc cleanups
cpqphp_core.c: lots of kernel-doc cleanups
cpqphp_ctrl.c: lots of kernel-doc cleanups
fakephp.c: correct kernel-doc notation
pciehp_ctrl.c: correct kernel-doc notation
rpadlpar_core.c: correct function names & kernel-doc notation
rpaphp_core.c: correct kernel-doc notation
shpchp_ctrl.c: correct kernel-doc notation

Signed-off-by: Randy Dunlap <[email protected]>
Cc: Kristen Accardi <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>

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