Commit Graph

798 Commits

Author SHA1 Message Date
Linus Torvalds
7f0ef0267e Merge branch 'akpm' (updates from Andrew Morton)
Merge first patch-bomb from Andrew Morton:
 - various misc bits
 - I'm been patchmonkeying ocfs2 for a while, as Joel and Mark have been
   distracted.  There has been quite a bit of activity.
 - About half the MM queue
 - Some backlight bits
 - Various lib/ updates
 - checkpatch updates
 - zillions more little rtc patches
 - ptrace
 - signals
 - exec
 - procfs
 - rapidio
 - nbd
 - aoe
 - pps
 - memstick
 - tools/testing/selftests updates

* emailed patches from Andrew Morton <akpm@linux-foundation.org>: (445 commits)
  tools/testing/selftests: don't assume the x bit is set on scripts
  selftests: add .gitignore for kcmp
  selftests: fix clean target in kcmp Makefile
  selftests: add .gitignore for vm
  selftests: add hugetlbfstest
  self-test: fix make clean
  selftests: exit 1 on failure
  kernel/resource.c: remove the unneeded assignment in function __find_resource
  aio: fix wrong comment in aio_complete()
  drivers/w1/slaves/w1_ds2408.c: add magic sequence to disable P0 test mode
  drivers/memstick/host/r592.c: convert to module_pci_driver
  drivers/memstick/host/jmb38x_ms: convert to module_pci_driver
  pps-gpio: add device-tree binding and support
  drivers/pps/clients/pps-gpio.c: convert to module_platform_driver
  drivers/pps/clients/pps-gpio.c: convert to devm_* helpers
  drivers/parport/share.c: use kzalloc
  Documentation/accounting/getdelays.c: avoid strncpy in accounting tool
  aoe: update internal version number to v83
  aoe: update copyright date
  aoe: perform I/O completions in parallel
  ...
2013-07-03 17:12:13 -07:00
Kees Cook
d8537548c9 drivers: avoid format strings in names passed to alloc_workqueue()
For the workqueue creation interfaces that do not expect format strings,
make sure they cannot accidently be parsed that way.  Additionally, clean
up calls made with a single parameter that would be handled as a format
string.  Many callers are passing potentially dynamic string content, so
use "%s" in those cases to avoid any potential accidents.

Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-07-03 16:07:41 -07:00
Linus Torvalds
c1101cbc7d Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux
Pull s390 updates from Martin Schwidefsky:
 "This is the bulk of the s390 patches for the 3.11 merge window.

  Notable enhancements are: the block timeout patches for dasd from
  Hannes, and more work on the PCI support front.  In addition some
  cleanup and the usual bug fixing."

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux: (42 commits)
  s390/dasd: Fail all requests when DASD_FLAG_ABORTIO is set
  s390/dasd: Add 'timeout' attribute
  block: check for timeout function in blk_rq_timed_out()
  block/dasd: detailed I/O errors
  s390/dasd: Reduce amount of messages for specific errors
  s390/dasd: Implement block timeout handling
  s390/dasd: process all requests in the device tasklet
  s390/dasd: make number of retries configurable
  s390/dasd: Clarify comment
  s390/hwsampler: Updated misleading member names in hws_data_entry
  s390/appldata_net_sum: do not use static data
  s390/appldata_mem: do not use static data
  s390/vmwatchdog: do not use static data
  s390/airq: simplify adapter interrupt code
  s390/pci: remove per device debug attribute
  s390/dma: remove gratuitous brackets
  s390/facility: decompose test_facility()
  s390/sclp: remove duplicated include from sclp_ctl.c
  s390/irq: store interrupt information in pt_regs
  s390/drivers: Cocci spatch "ptr_ret.spatch"
  ...
2013-07-03 11:08:24 -07:00
Linus Torvalds
790eac5640 Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
Pull second set of VFS changes from Al Viro:
 "Assorted f_pos race fixes, making do_splice_direct() safe to call with
  i_mutex on parent, O_TMPFILE support, Jeff's locks.c series,
  ->d_hash/->d_compare calling conventions changes from Linus, misc
  stuff all over the place."

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: (63 commits)
  Document ->tmpfile()
  ext4: ->tmpfile() support
  vfs: export lseek_execute() to modules
  lseek_execute() doesn't need an inode passed to it
  block_dev: switch to fixed_size_llseek()
  cpqphp_sysfs: switch to fixed_size_llseek()
  tile-srom: switch to fixed_size_llseek()
  proc_powerpc: switch to fixed_size_llseek()
  ubi/cdev: switch to fixed_size_llseek()
  pci/proc: switch to fixed_size_llseek()
  isapnp: switch to fixed_size_llseek()
  lpfc: switch to fixed_size_llseek()
  locks: give the blocked_hash its own spinlock
  locks: add a new "lm_owner_key" lock operation
  locks: turn the blocked_list into a hashtable
  locks: convert fl_link to a hlist_node
  locks: avoid taking global lock if possible when waking up blocked waiters
  locks: protect most of the file_lock handling with i_lock
  locks: encapsulate the fl_link list handling
  locks: make "added" in __posix_lock_file a bool
  ...
2013-07-03 09:10:19 -07:00
Linus Torvalds
fc76a258d4 Driver core patches for 3.11-rc1
Here's the big driver core merge for 3.11-rc1
 
 Lots of little things, and larger firmware subsystem updates, all
 described in the shortlog.  Nice thing here is that we finally get rid
 of CONFIG_HOTPLUG, after 10+ years, thanks to Stephen Rohtwell (it had
 been always on for a number of kernel releases, now it's just removed.)
 
 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Merge tag 'driver-core-3.11-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core

Pull driver core updates from Greg KH:
 "Here's the big driver core merge for 3.11-rc1

  Lots of little things, and larger firmware subsystem updates, all
  described in the shortlog.  Nice thing here is that we finally get rid
  of CONFIG_HOTPLUG, after 10+ years, thanks to Stephen Rohtwell (it had
  been always on for a number of kernel releases, now it's just
  removed)"

* tag 'driver-core-3.11-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core: (27 commits)
  driver core: device.h: fix doc compilation warnings
  firmware loader: fix another compile warning with PM_SLEEP unset
  build some drivers only when compile-testing
  firmware loader: fix compile warning with PM_SLEEP set
  kobject: sanitize argument for format string
  sysfs_notify is only possible on file attributes
  firmware loader: simplify holding module for request_firmware
  firmware loader: don't export cache_firmware and uncache_firmware
  drivers/base: Use attribute groups to create sysfs memory files
  firmware loader: fix compile warning
  firmware loader: fix build failure with !CONFIG_FW_LOADER_USER_HELPER
  Documentation: Updated broken link in HOWTO
  Finally eradicate CONFIG_HOTPLUG
  driver core: firmware loader: kill FW_ACTION_NOHOTPLUG requests before suspend
  driver core: firmware loader: don't cache FW_ACTION_NOHOTPLUG firmware
  Documentation: Tidy up some drivers/base/core.c kerneldoc content.
  platform_device: use a macro instead of platform_driver_register
  firmware: move EXPORT_SYMBOL annotations
  firmware: Avoid deadlock of usermodehelper lock at shutdown
  dell_rbu: Select CONFIG_FW_LOADER_USER_HELPER explicitly
  ...
2013-07-02 11:44:19 -07:00
Al Viro
d2c40f789f cpqphp_sysfs: switch to fixed_size_llseek()
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-06-29 12:57:52 +04:00
Sebastian Ott
8b2a7e609b s390/pci: remove pdev during unplug
The disable slot implementation on s390 currently just detaches the
pci function from the partition - without informing the pci layer.
Fix this by calling pci_stop_and_remove_bus_device prior to the
operation.

Reviewed-by: Gerald Schaefer <gerald.schaefer@de.ibm.com>
Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2013-06-26 21:10:08 +02:00
Sebastian Ott
4bee2a5dce s390/pci: cleanup hotplug code
Provide wrappers for the [de]configure operations, add some error
handling, and use pci_scan_slot instead of pci_scan_single_device.

Reviewed-by: Gerald Schaefer <gerald.schaefer@de.ibm.com>
Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2013-06-26 21:10:07 +02:00
Rafael J. Wysocki
21a31013f7 ACPI / dock / PCI: Synchronous handling of dock events for PCI devices
The interactions between the ACPI dock driver and the ACPI-based PCI
hotplug (acpiphp) are currently problematic because of ordering
issues during hot-remove operations.

First of all, the current ACPI glue code expects that physical
devices will always be deleted before deleting the companion ACPI
device objects.  Otherwise, acpi_unbind_one() will fail with a
warning message printed to the kernel log, for example:

[  185.026073] usb usb5: Oops, 'acpi_handle' corrupt
[  185.035150] pci 0000:1b:00.0: Oops, 'acpi_handle' corrupt
[  185.035515] pci 0000:18:02.0: Oops, 'acpi_handle' corrupt
[  180.013656]  port1: Oops, 'acpi_handle' corrupt

This means, in particular, that struct pci_dev objects have to
be deleted before the struct acpi_device objects they are "glued"
with.

Now, the following happens the during the undocking of an ACPI-based
dock station:
 1) hotplug_dock_devices() invokes registered hotplug callbacks to
    destroy physical devices associated with the ACPI device objects
    depending on the dock station.  It calls dd->ops->handler() for
    each of those device objects.
 2) For PCI devices dd->ops->handler() points to
    handle_hotplug_event_func() that queues up a separate work item
    to execute _handle_hotplug_event_func() for the given device and
    returns immediately.  That work item will be executed later.
 3) hotplug_dock_devices() calls dock_remove_acpi_device() for each
    device depending on the dock station.  This runs acpi_bus_trim()
    for each of them, which causes the underlying ACPI device object
    to be destroyed, but the work items queued up by
    handle_hotplug_event_func() haven't been started yet.
 4) _handle_hotplug_event_func() queued up in step 2) are executed
    and cause the above failure to happen, because the PCI devices
    they handle do not have the companion ACPI device objects any
    more (those objects have been deleted in step 3).

The possible breakage doesn't end here, though, because
hotplug_dock_devices() may return before at least some of the
_handle_hotplug_event_func() work items spawned by it have a
chance to complete and then undock() will cause _DCK to be
evaluated and that will cause the devices handled by the
_handle_hotplug_event_func() to go away possibly while they are
being accessed.

This means that dd->ops->handler() for PCI devices should not point
to handle_hotplug_event_func().  Instead, it should point to a
function that will do the work of _handle_hotplug_event_func()
synchronously.  For this reason, introduce such a function,
hotplug_event_func(), and modity acpiphp_dock_ops to point to
it as the handler.

Unfortunately, however, this is not sufficient, because if the dock
code were not changed further, hotplug_event_func() would now
deadlock with hotplug_dock_devices() that called it, since it would
run unregister_hotplug_dock_device() which in turn would attempt to
acquire the dock station's hp_lock mutex already acquired by
hotplug_dock_devices().

To resolve that deadlock use the observation that
unregister_hotplug_dock_device() won't need to acquire hp_lock
if PCI bridges the devices on the dock station depend on are
prevented from being removed prematurely while the first loop in
hotplug_dock_devices() is in progress.

To make that possible, introduce a mechanism by which the callers of
register_hotplug_dock_device() can provide "init" and "release"
routines that will be executed, respectively, during the addition
and removal of the physical device object associated with the
given ACPI device handle.  Make acpiphp use two new functions,
acpiphp_dock_init() and acpiphp_dock_release(), that call
get_bridge() and put_bridge(), respectively, on the acpiphp bridge
holding the given device, for this purpose.

In addition to that, remove the dock station's list of
"hotplug devices" and make the dock code always walk the whole list
of "dependent devices" instead in such a way that the loops in
hotplug_dock_devices() and dock_event() (replacing the loops over
"hotplug devices") will take references to the list entries that
register_hotplug_dock_device() has been called for.  That prevents
the "release" routines associated with those entries from being
called while the given entry is being processed and for PCI
devices this means that their bridges won't be removed (by a
concurrent thread) while hotplug_event_func() handling them is
being executed.

This change is based on two earlier patches from Jiang Liu.

References: https://bugzilla.kernel.org/show_bug.cgi?id=59501
Reported-and-tested-by: Alexander E. Patrakov <patrakov@gmail.com>
Tracked-down-by: Jiang Liu <jiang.liu@huawei.com>
Tested-by: Illya Klymov <xanf@xanf.me>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Yinghai Lu <yinghai@kernel.org>
Cc: 3.9+ <stable@vger.kernel.org>
2013-06-24 11:22:53 +02:00
Jiang Liu
d66ecb7220 PCI / ACPI: Use boot-time resource allocation rules during hotplug
On x86 platforms, the kernel respects PCI resource assignments from
the BIOS and only reassigns resources for unassigned BARs at boot
time.  However, with the ACPI-based hotplug (acpiphp), it ignores the
BIOS' PCI resource assignments completely and reassigns all resources
by itself.  This causes differences in PCI resource allocation
between boot time and runtime hotplug to occur, which is generally
undesirable and sometimes actively breaks things.

Namely, if there are enough resources, reassigning all PCI resources
during runtime hotplug should work, but it may fail if the resources
are constrained.  This may happen, for instance, when some PCI
devices with huge MMIO BARs are involved in the runtime hotplug
operations, because the current PCI MMIO alignment algorithm may
waste huge chunks of MMIO address space in those cases.

On the Alexander's Sony VAIO VPCZ23A4R the BIOS allocates limited
MMIO resources for the dock station which contains a device
(graphics adapter) with a 256MB MMIO BAR.  An attempt to reassign
that during runtime hotplug causes the dock station MMIO window to be
exhausted and acpiphp fails to allocate resources for the majority
of devices on the dock station as a result.

To prevent that from happening, modify acpiphp to follow the boot
time resources allocation behavior so that the BIOS' resource
assignments are respected during runtime hotplug too.

[rjw: Changelog]
References: https://bugzilla.kernel.org/show_bug.cgi?id=56531
Reported-and-tested-by: Alexander E. Patrakov <patrakov@gmail.com>
Tested-by: Illya Klymov <xanf@xanf.me>
Signed-off-by: Jiang Liu <jiang.liu@huawei.com>
Acked-by: Yinghai Lu <yinghai@kernel.org>
Cc: 3.9+ <stable@vger.kernel.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2013-06-23 01:01:35 +02:00
Stephen Rothwell
40b313608a Finally eradicate CONFIG_HOTPLUG
Ever since commit 45f035ab9b ("CONFIG_HOTPLUG should be always on"),
it has been basically impossible to build a kernel with CONFIG_HOTPLUG
turned off.  Remove all the remaining references to it.

Cc: Russell King <linux@arm.linux.org.uk>
Cc: Doug Thompson <dougthompson@xmission.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Steven Whitehouse <swhiteho@redhat.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Pavel Machek <pavel@ucw.cz>
Cc: "Rafael J. Wysocki" <rjw@sisk.pl>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Acked-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Acked-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-06-03 14:20:18 -07:00
Yinghai Lu
3f327e39b4 PCI: acpiphp: Re-enumerate devices when host bridge receives Bus Check
When a PCI host bridge device receives a Bus Check notification, we
must re-enumerate starting with the bridge to discover changes (devices
that have been added or removed).

Prior to 668192b678 ("PCI: acpiphp: Move host bridge hotplug to
pci_root.c"), this happened in _handle_hotplug_event_bridge().  After that
commit, _handle_hotplug_event_bridge() is not installed for host bridges,
and the host bridge notify handler, _handle_hotplug_event_root() did not
re-enumerate.

This patch adds re-enumeration to _handle_hotplug_event_root().

This fixes cases where we don't notice the addition or removal of
PCI devices, e.g., the PCI-to-USB ExpressCard in the bugzilla below.

[bhelgaas: changelog, references]
Reference: https://lkml.kernel.org/r/CAAh6nkmbKR3HTqm5ommevsBwhL_u0N8Rk7Wsms_LfP=nBgKNew@mail.gmail.com
Reference: https://bugzilla.kernel.org/show_bug.cgi?id=57961
Reported-by: Gavin Guo <tuffkidtt@gmail.com>
Tested-by: Gavin Guo <tuffkidtt@gmail.com>
Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Jiang Liu <jiang.liu@huawei.com>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
CC: stable@vger.kernel.org	# v3.9+
2013-05-17 14:12:06 -06:00
Linus Torvalds
96a3e8af5a PCI changes for the v3.10 merge window:
PCI device hotplug
     - Remove ACPI PCI subdrivers (Jiang Liu, Myron Stowe)
     - Make acpiphp builtin only, not modular (Jiang Liu)
     - Add acpiphp mutual exclusion (Jiang Liu)
 
   Power management
     - Skip "PME enabled/disabled" messages when not supported (Rafael Wysocki)
     - Fix fallback to PCI_D0 (Rafael Wysocki)
 
   Miscellaneous
     - Factor quirk_io_region (Yinghai Lu)
     - Cache MSI capability offsets & cleanup (Gavin Shan, Bjorn Helgaas)
     - Clean up EISA resource initialization and logging (Bjorn Helgaas)
     - Fix prototype warnings (Andy Shevchenko, Bjorn Helgaas)
     - MIPS: Initialize of_node before scanning bus (Gabor Juhos)
     - Fix pcibios_get_phb_of_node() declaration "weak" annotation (Gabor Juhos)
     - Add MSI INTX_DISABLE quirks for AR8161/AR8162/etc (Xiong Huang)
     - Fix aer_inject return values (Prarit Bhargava)
     - Remove PME/ACPI dependency (Andrew Murray)
     - Use shared PCI_BUS_NUM() and PCI_DEVID() (Shuah Khan)
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Merge tag 'pci-v3.10-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci

Pull PCI updates from Bjorn Helgaas:
 "PCI changes for the v3.10 merge window:

  PCI device hotplug
   - Remove ACPI PCI subdrivers (Jiang Liu, Myron Stowe)
   - Make acpiphp builtin only, not modular (Jiang Liu)
   - Add acpiphp mutual exclusion (Jiang Liu)

  Power management
   - Skip "PME enabled/disabled" messages when not supported (Rafael
     Wysocki)
   - Fix fallback to PCI_D0 (Rafael Wysocki)

  Miscellaneous
   - Factor quirk_io_region (Yinghai Lu)
   - Cache MSI capability offsets & cleanup (Gavin Shan, Bjorn Helgaas)
   - Clean up EISA resource initialization and logging (Bjorn Helgaas)
   - Fix prototype warnings (Andy Shevchenko, Bjorn Helgaas)
   - MIPS: Initialize of_node before scanning bus (Gabor Juhos)
   - Fix pcibios_get_phb_of_node() declaration "weak" annotation (Gabor
     Juhos)
   - Add MSI INTX_DISABLE quirks for AR8161/AR8162/etc (Xiong Huang)
   - Fix aer_inject return values (Prarit Bhargava)
   - Remove PME/ACPI dependency (Andrew Murray)
   - Use shared PCI_BUS_NUM() and PCI_DEVID() (Shuah Khan)"

* tag 'pci-v3.10-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci: (63 commits)
  vfio-pci: Use cached MSI/MSI-X capabilities
  vfio-pci: Use PCI_MSIX_TABLE_BIR, not PCI_MSIX_FLAGS_BIRMASK
  PCI: Remove "extern" from function declarations
  PCI: Use PCI_MSIX_TABLE_BIR, not PCI_MSIX_FLAGS_BIRMASK
  PCI: Drop msi_mask_reg() and remove drivers/pci/msi.h
  PCI: Use msix_table_size() directly, drop multi_msix_capable()
  PCI: Drop msix_table_offset_reg() and msix_pba_offset_reg() macros
  PCI: Drop is_64bit_address() and is_mask_bit_support() macros
  PCI: Drop msi_data_reg() macro
  PCI: Drop msi_lower_address_reg() and msi_upper_address_reg() macros
  PCI: Drop msi_control_reg() macro and use PCI_MSI_FLAGS directly
  PCI: Use cached MSI/MSI-X offsets from dev, not from msi_desc
  PCI: Clean up MSI/MSI-X capability #defines
  PCI: Use cached MSI-X cap while enabling MSI-X
  PCI: Use cached MSI cap while enabling MSI interrupts
  PCI: Remove MSI/MSI-X cap check in pci_msi_check_device()
  PCI: Cache MSI/MSI-X capability offsets in struct pci_dev
  PCI: Use u8, not int, for PM capability offset
  [SCSI] megaraid_sas: Use correct #define for MSI-X capability
  PCI: Remove "extern" from function declarations
  ...
2013-04-29 09:30:25 -07:00
Bjorn Helgaas
723ec4d06c Merge branch 'pci/cleanup' into next
* pci/cleanup:
  PCI: Remove "extern" from function declarations
  PCI: Warn about failures instead of "must_check" functions
  PCI: Remove __must_check from definitions
  PCI: Remove unused variables
  PCI: Move cpci_hotplug_init() proto to header file
  PCI: Make local functions/structs static
  PCI: Fix missing prototype for pcie_port_acpi_setup()

Conflicts:
	drivers/pci/hotplug/acpiphp.h
	include/linux/pci.h
2013-04-17 10:31:34 -06:00
Bjorn Helgaas
f39d5b7291 PCI: Remove "extern" from function declarations
We had an inconsistent mix of using and omitting the "extern" keyword
on function declarations in header files.  This removes them all.

Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
2013-04-17 10:21:17 -06:00
Bjorn Helgaas
d67aed63b8 PCI: Remove __must_check from definitions
The __must_check (gcc "warn_unused_result") attribute only makes sense
when compiling the *caller* of the function, so the attribute should
appear on the declaration in the header file, not on the definition.

The declarations of these functions are already annotated with
__must_check.

Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
2013-04-17 10:20:58 -06:00
Sebastian Ott
cb65a669f6 s390/pci: do not modify function handles
Don't modify function handles to get a disabled handle - call
clp_disable_fh. With this change we also do no longer deconfigure
enabled functions.

Reviewed-by: Gerald Schaefer <gerald.schaefer@de.ibm.com>
Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2013-04-17 14:07:36 +02:00
Sebastian Ott
a2ab833360 s390/pci: debug device states
Use the debugfs to keep track of a pci function's status changes.

Reviewed-by: Gerald Schaefer <gerald.schaefer@de.ibm.com>
Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2013-04-17 14:07:35 +02:00
Bjorn Helgaas
a3b6bbd577 Merge branch 'pci/jiang-subdrivers' into next
* pci/jiang-subdrivers:
  PCI/ACPI: Remove support of ACPI PCI subdrivers
  PCI: acpiphp: Protect acpiphp data structures from concurrent updates
  PCI: acpiphp: Use normal list to simplify implementation
  PCI: acpiphp: Do not use ACPI PCI subdriver mechanism
  PCI: acpiphp: Convert acpiphp to be builtin only, not modular
  PCI/ACPI: Handle PCI slot devices when creating/destroying PCI buses
  x86/PCI: Implement pcibios_{add|remove}_bus() hooks
  ia64/PCI: Implement pcibios_{add|remove}_bus() hooks
  PCI/ACPI: Prepare stub functions to handle ACPI PCI (hotplug) slots
  PCI: Add pcibios hooks for adding and removing PCI buses
  PCI: acpiphp: Replace local macros with standard ACPI macros
  PCI: acpiphp: Remove all functions even if function 0 doesn't exist
  PCI: acpiphp: Use list_for_each_entry_safe() in acpiphp_sanitize_bus()
  PCI: Clean up usages of pci_bus->is_added
  PCI: When removing bus, always remove legacy files & unregister
2013-04-16 10:37:22 -06:00
Jiang Liu
3d54a3160f PCI: acpiphp: Protect acpiphp data structures from concurrent updates
Now acpiphp_enumerate_slots() and acpiphp_remove_slots() may be invoked
concurrently by the PCI core, so add a bridge_mutex and reference count
mechanism to protect acpiphp bridge/slot/function data structures.

To avoid deadlock, handle_hotplug_event_bridge() will requeue the
hotplug event onto the kacpi_hotplug_wq by calling alloc_acpi_hp_work().
But the workaround has introduced a minor race window because the
'bridge' passed to _handle_hotplug_event_bridge() may have already been
destroyed when _handle_hotplug_event_bridge() is actually executed by
the kacpi_hotplug_wq.  So hold a reference count on the passed 'bridge'.
Fix the same issue for handle_hotplug_event_func() too.

Signed-off-by: Jiang Liu <jiang.liu@huawei.com>
Signed-off-by: Yijing Wang <wangyijing@huawei.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Yinghai Lu <yinghai@kernel.org>
Cc: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>
Cc: Toshi Kani <toshi.kani@hp.com>
2013-04-16 10:27:14 -06:00
Yijing Wang
ad41dd9dd0 PCI: acpiphp: Use normal list to simplify implementation
Use normal list for struct acpiphp_slot to simplify implementation.

Signed-off-by: Yijing Wang <wangyijing@huawei.com>
Signed-off-by: Jiang Liu <jiang.liu@huawei.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Yinghai Lu <yinghai@kernel.org>
Cc: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>
Cc: Toshi Kani <toshi.kani@hp.com>
2013-04-16 10:27:14 -06:00
Bjorn Helgaas
545d7b78e0 PCI: Use PCI_EXP_SLTCAP_PSN mask when extracting slot number
Use PCI_EXP_SLTCAP_PSN mask to make it easier to find where the
Physical Slot Number is used.

The Physical Slot Number is bits 31:19 of the Slot Capabilities Register,
and slot_cap is a u32, so the mask is technically unnecessary, but it's
helpful for human readers.

Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
2013-04-15 14:30:44 -06:00
Bjorn Helgaas
b638d7e7b8 PCI: Remove unused variables
This fixes "set but not used" warnings found via "make W=1".

Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
2013-04-15 10:56:27 -06:00
Bjorn Helgaas
c3139ba212 PCI: Move cpci_hotplug_init() proto to header file
cpci_hotplug_init() and cpci_hotplug_exit() are defined in
cpci_hotplug_core.c but had extern declarations in pci_hotplug_core.c.
This puts the declarations in a header file included both places so
the compiler can help keep everything consistent.

Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
2013-04-15 10:44:18 -06:00
Jiang Liu
3b63aaa70e PCI: acpiphp: Do not use ACPI PCI subdriver mechanism
Previously the acpiphp driver registered itself as an ACPI PCI subdriver,
so its callbacks were invoked when creating/destroying PCI root
buses to manage ACPI-based PCI hotplug slots.  But it doesn't handle
P2P bridge hotplug events, so it will cause strange behaviour if there
are hotplug slots associated with a hot-removed P2P bridge.

This patch fixes this issue by:
1) Directly hooking into PCI core to update hotplug slot devices when
   creating/destroying PCI buses through:
	pci_{add|remove}_bus() -> acpi_pci_{add|remove}_bus()
2) Getting rid of unused ACPI PCI subdriver-related code

It also cleans up unused code in the acpiphp driver.

[bhelgaas: keep acpi_pci_add_bus() stub for CONFIG_ACPI=n]
Signed-off-by: Jiang Liu <jiang.liu@huawei.com>
Signed-off-by: Yijing Wang <wangyijing@huawei.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Yinghai Lu <yinghai@kernel.org>
Cc: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>
Cc: Toshi Kani <toshi.kani@hp.com>
2013-04-12 16:52:01 -06:00
Jiang Liu
6037a803b0 PCI: acpiphp: Convert acpiphp to be builtin only, not modular
Convert acpiphp to be builtin only, with no module option.

Previously, when HOTPLUG_PCI_ACPI=m, users could disable acpiphp by
removing the module or preventing it from loading.  That can't be done
if acpiphp is builtin statically, so this adds an "acpiphp.disable"
kernel parameter.  If a user needs to use this parameter, it is a bug,
and we want to hear about it.

[bhelgaas: fold in acpiphp.disable here, remove documentation]
Signed-off-by: Jiang Liu <jiang.liu@huawei.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
2013-04-12 15:38:25 -06:00
Jiang Liu
ce15d873d0 PCI: acpiphp: Replace local macros with standard ACPI macros
Replace local defined macros (ACPI_STA_xxx) with standard ACPI macros
(ACPI_STA_DEVICE_xxx).

Signed-off-by: Jiang Liu <jiang.liu@huawei.com>
Signed-off-by: Yijing Wang <wangyijing@huawei.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Yinghai Lu <yinghai@kernel.org>
Cc: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>
Cc: Toshi Kani <toshi.kani@hp.com>
2013-04-12 15:38:25 -06:00
Jiang Liu
3a0e40beef PCI: acpiphp: Remove all functions even if function 0 doesn't exist
Currently function disable_device() detects slot state by checking
existence of PCI function 0.  It's unreliable because the PCI device
for function 0 may be removed through the sysfs interface.  If that
happens, it will cause powering off a hotplug slot without destroying
all PCI devices.

On the other hand, it won't hurt us except wasting some computation
power if the check is removed, because all code of disable_device()
is self-protected.  So remove the check.

Signed-off-by: Jiang Liu <jiang.liu@huawei.com>
Signed-off-by: Yijing Wang <wangyijing@huawei.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Yinghai Lu <yinghai@kernel.org>
Cc: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>
Cc: Toshi Kani <toshi.kani@hp.com>
2013-04-12 15:38:25 -06:00
Yijing Wang
d65eba6a7a PCI: acpiphp: Use list_for_each_entry_safe() in acpiphp_sanitize_bus()
Function acpiphp_sanitize_bus() may call pci_stop_and_remove_bus_device(),
which in turn may remove device from bus->devices list. So walk the
bus->devices list with list_for_each_entry_safe().

Signed-off-by: Yijing Wang <wangyijing@huawei.com>
Signed-off-by: Jiang Liu <jiang.liu@huawei.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Yinghai Lu <yinghai@kernel.org>
Cc: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>
Cc: Toshi Kani <toshi.kani@hp.com>
2013-04-12 15:38:25 -06:00
Linus Torvalds
556f12f602 PCI changes for the v3.9 merge window:
Host bridge hotplug
     - Major overhaul of ACPI host bridge add/start (Rafael Wysocki, Yinghai Lu)
     - Major overhaul of PCI/ACPI binding (Rafael Wysocki, Yinghai Lu)
     - Split out ACPI host bridge and ACPI PCI device hotplug (Yinghai Lu)
     - Stop caching _PRT and make independent of bus numbers (Yinghai Lu)
 
   PCI device hotplug
     - Clean up cpqphp dead code (Sasha Levin)
     - Disable ARI unless device and upstream bridge support it (Yijing Wang)
     - Initialize all hot-added devices (not functions 0-7) (Yijing Wang)
 
   Power management
     - Don't touch ASPM if disabled (Joe Lawrence)
     - Fix ASPM link state management (Myron Stowe)
 
   Miscellaneous
     - Fix PCI_EXP_FLAGS accessor (Alex Williamson)
     - Disable Bus Master in pci_device_shutdown (Konstantin Khlebnikov)
     - Document hotplug resource and MPS parameters (Yijing Wang)
     - Add accessor for PCIe capabilities (Myron Stowe)
     - Drop pciehp suspend/resume messages (Paul Bolle)
     - Make pci_slot built-in only (not a module) (Jiang Liu)
     - Remove unused PCI/ACPI bind ops (Jiang Liu)
     - Removed used pci_root_bus (Bjorn Helgaas)
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Merge tag 'pci-v3.9-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci

Pull PCI changes from Bjorn Helgaas:
 "Host bridge hotplug
    - Major overhaul of ACPI host bridge add/start (Rafael Wysocki, Yinghai Lu)
    - Major overhaul of PCI/ACPI binding (Rafael Wysocki, Yinghai Lu)
    - Split out ACPI host bridge and ACPI PCI device hotplug (Yinghai Lu)
    - Stop caching _PRT and make independent of bus numbers (Yinghai Lu)

  PCI device hotplug
    - Clean up cpqphp dead code (Sasha Levin)
    - Disable ARI unless device and upstream bridge support it (Yijing Wang)
    - Initialize all hot-added devices (not functions 0-7) (Yijing Wang)

  Power management
    - Don't touch ASPM if disabled (Joe Lawrence)
    - Fix ASPM link state management (Myron Stowe)

  Miscellaneous
    - Fix PCI_EXP_FLAGS accessor (Alex Williamson)
    - Disable Bus Master in pci_device_shutdown (Konstantin Khlebnikov)
    - Document hotplug resource and MPS parameters (Yijing Wang)
    - Add accessor for PCIe capabilities (Myron Stowe)
    - Drop pciehp suspend/resume messages (Paul Bolle)
    - Make pci_slot built-in only (not a module) (Jiang Liu)
    - Remove unused PCI/ACPI bind ops (Jiang Liu)
    - Removed used pci_root_bus (Bjorn Helgaas)"

* tag 'pci-v3.9-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci: (51 commits)
  PCI/ACPI: Don't cache _PRT, and don't associate them with bus numbers
  PCI: Fix PCI Express Capability accessors for PCI_EXP_FLAGS
  ACPI / PCI: Make pci_slot built-in only, not a module
  PCI/PM: Clear state_saved during suspend
  PCI: Use atomic_inc_return() rather than atomic_add_return()
  PCI: Catch attempts to disable already-disabled devices
  PCI: Disable Bus Master unconditionally in pci_device_shutdown()
  PCI: acpiphp: Remove dead code for PCI host bridge hotplug
  PCI: acpiphp: Create companion ACPI devices before creating PCI devices
  PCI: Remove unused "rc" in virtfn_add_bus()
  PCI: pciehp: Drop suspend/resume ENTRY messages
  PCI/ASPM: Don't touch ASPM if forcibly disabled
  PCI/ASPM: Deallocate upstream link state even if device is not PCIe
  PCI: Document MPS parameters pci=pcie_bus_safe, pci=pcie_bus_perf, etc
  PCI: Document hpiosize= and hpmemsize= resource reservation parameters
  PCI: Use PCI Express Capability accessor
  PCI: Introduce accessor to retrieve PCIe Capabilities Register
  PCI: Put pci_dev in device tree as early as possible
  PCI: Skip attaching driver in device_add()
  PCI: acpiphp: Keep driver loaded even if no slots found
  ...
2013-02-25 21:18:18 -08:00
Linus Torvalds
81ec44a6c6 Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux
Pull s390 update from Martin Schwidefsky:
 "The most prominent change in this patch set is the software dirty bit
  patch for s390.  It removes __HAVE_ARCH_PAGE_TEST_AND_CLEAR_DIRTY and
  the page_test_and_clear_dirty primitive which makes the common memory
  management code a bit less obscure.

  Heiko fixed most of the PCI related fallout, more often than not
  missing GENERIC_HARDIRQS dependencies.  Notable is one of the 3270
  patches which adds an export to tty_io to be able to resize a tty.

  The rest is the usual bunch of cleanups and bug fixes."

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux: (42 commits)
  s390/module: Add missing R_390_NONE relocation type
  drivers/gpio: add missing GENERIC_HARDIRQ dependency
  drivers/input: add couple of missing GENERIC_HARDIRQS dependencies
  s390/cleanup: rename SPP to LPP
  s390/mm: implement software dirty bits
  s390/mm: Fix crst upgrade of mmap with MAP_FIXED
  s390/linker skript: discard exit.data at runtime
  drivers/media: add missing GENERIC_HARDIRQS dependency
  s390/bpf,jit: add vlan tag support
  drivers/net,AT91RM9200: add missing GENERIC_HARDIRQS dependency
  iucv: fix kernel panic at reboot
  s390/Kconfig: sort list of arch selected config options
  phylib: remove !S390 dependeny from Kconfig
  uio: remove !S390 dependency from Kconfig
  dasd: fix sysfs cleanup in dasd_generic_remove
  s390/pci: fix hotplug module init
  s390/pci: cleanup clp page allocation
  s390/pci: cleanup clp inline assembly
  s390/perf: cpum_cf: fallback to software sampling events
  s390/mm: provide PAGE_SHARED define
  ...
2013-02-21 17:54:03 -08:00
Sebastian Ott
53923354d6 s390/pci: fix hotplug module init
Loading the pci hotplug module when no devices are present will fail
but unfortunately some hotplug callbacks stay registered to the pci
bus level. Fix this by not letting module loading fail when no pci
devices are present and provide proper {de}registration functions
for these callbacks.

Reviewed-by: Gerald Schaefer <gerald.schaefer@de.ibm.com>
Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2013-02-14 15:55:17 +01:00
Heiko Carstens
1e5635d10d s390/pci: rename pci_probe to s390_pci_probe
pci_probe is too generic and has a name clash with other common code parts.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2013-02-14 15:55:12 +01:00
Rafael J. Wysocki
3757b94802 ACPI / hotplug: Fix concurrency issues and memory leaks
This changeset is aimed at fixing a few different but related
problems in the ACPI hotplug infrastructure.

First of all, since notify handlers may be run in parallel with
acpi_bus_scan(), acpi_bus_trim() and acpi_bus_hot_remove_device()
and some of them are installed for ACPI handles that have no struct
acpi_device objects attached (i.e. before those objects are created),
those notify handlers have to take acpi_scan_lock to prevent races
from taking place (e.g. a struct acpi_device is found to be present
for the given ACPI handle, but right after that it is removed by
acpi_bus_trim() running in parallel to the given notify handler).
Moreover, since some of them call acpi_bus_scan() and
acpi_bus_trim(), this leads to the conclusion that acpi_scan_lock
should be acquired by the callers of these two funtions rather by
these functions themselves.

For these reasons, make all notify handlers that can handle device
addition and eject events take acpi_scan_lock and remove the
acpi_scan_lock locking from acpi_bus_scan() and acpi_bus_trim().
Accordingly, update all of their users to make sure that they
are always called under acpi_scan_lock.

Furthermore, since eject operations are carried out asynchronously
with respect to the notify events that trigger them, with the help
of acpi_bus_hot_remove_device(), even if notify handlers take the
ACPI scan lock, it still is possible that, for example,
acpi_bus_trim() will run between acpi_bus_hot_remove_device() and
the notify handler that scheduled its execution and that
acpi_bus_trim() will remove the device node passed to
acpi_bus_hot_remove_device() for ejection.  In that case, the struct
acpi_device object obtained by acpi_bus_hot_remove_device() will be
invalid and not-so-funny things will ensue.  To protect agaist that,
make the users of acpi_bus_hot_remove_device() run get_device() on
ACPI device node objects that are about to be passed to it and make
acpi_bus_hot_remove_device() run put_device() on them and check if
their ACPI handles are not NULL (make acpi_device_unregister() clear
the device nodes' ACPI handles for that check to work).

Finally, observe that acpi_os_hotplug_execute() actually can fail,
in which case its caller ought to free memory allocated for the
context object to prevent leaks from happening.  It also needs to
run put_device() on the device node that it ran get_device() on
previously in that case.  Modify the code accordingly.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Yinghai Lu <yinghai@kernel.org>
2013-02-13 14:36:47 +01:00
Bjorn Helgaas
f2dfcde4cc Merge branch 'pci/misc' into next
* pci/misc:
  PCI: pciehp: Drop suspend/resume ENTRY messages
  PCI: Document MPS parameters pci=pcie_bus_safe, pci=pcie_bus_perf, etc
  PCI: Document hpiosize= and hpmemsize= resource reservation parameters
  PCI: Use PCI Express Capability accessor
  PCI: Introduce accessor to retrieve PCIe Capabilities Register
  PCI: Kill pci_is_reassigndev()
2013-02-02 14:35:57 -07:00
Bjorn Helgaas
8e5de3dcc6 Merge branch 'pci/yinghai-root-bus-hotplug' into next
* pci/yinghai-root-bus-hotplug:
  PCI: acpiphp: Remove dead code for PCI host bridge hotplug
  PCI: acpiphp: Create companion ACPI devices before creating PCI devices
  PCI: Remove unused "rc" in virtfn_add_bus()
2013-02-02 14:30:42 -07:00
Jiang Liu
be6d2867b4 PCI: acpiphp: Remove dead code for PCI host bridge hotplug
Commit 668192b678 "PCI: acpiphp: Move host bridge hotplug
to pci_root.c" has moved PCI host bridge hotplug logic from acpiphp
to pci_root, but there is still PCI host bridge hotplug related
dead code left in acpiphp. So remove those dead code.

Now companion ACPI devices are always created before corresponding
PCI devices. And the ACPI event handle_hotplug_event_bridge() will be
installed only if it has associated PCI device. So remove dead code to
handle bridge hot-adding in function handle_hotplug_event_bridge().

Signed-off-by: Jiang Liu <jiang.liu@huawei.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
2013-02-02 14:28:02 -07:00
Jiang Liu
2ca344e8c7 PCI: acpiphp: Create companion ACPI devices before creating PCI devices
With commit 4f535093cf "PCI: Put pci_dev in device tree as
early as possible", companion ACPI devices should be created before
creating corresponding PCI devices, otherwise it will break the ACPI
PCI binding logic.

Without this patch, the /sys/bus/pci/devices/.../firmware_node symlink
is missing after hot-removing and hot-adding a device with acpiphp.

Signed-off-by: Jiang Liu <jiang.liu@huawei.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
2013-02-01 16:07:51 -07:00
Paul Bolle
775c739e0b PCI: pciehp: Drop suspend/resume ENTRY messages
In each suspend and resume cycle my laptop prints these messages at
KERN_INFO level:
    pciehp 0000:00:1c.1:pcie04: pciehp_suspend ENTRY
    pciehp 0000:00:1c.0:pcie04: pciehp_suspend ENTRY

and
    pciehp 0000:00:1c.0:pcie04: pciehp_resume ENTRY
    pciehp 0000:00:1c.1:pcie04: pciehp_resume ENTRY

Drop these messages, that were probably used to debug the suspend and
resume code, but now serve no purpose.

Signed-off-by: Paul Bolle <pebolle@tiscali.nl>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
2013-02-01 15:56:05 -07:00
Rafael J. Wysocki
64e94e7e0f Merge branch 'acpi-scan' into acpi-cleanup
The following commits depend on the 'acpi-scan' material.
2013-01-29 13:58:34 +01:00
Bjorn Helgaas
939de1d69c Merge branch 'pci/yinghai-root-bus-hotplug' into next
* pci/yinghai-root-bus-hotplug:
  PCI: Put pci_dev in device tree as early as possible
  PCI: Skip attaching driver in device_add()
  PCI: acpiphp: Keep driver loaded even if no slots found
  PCI/ACPI: Print info if host bridge notify handler installation fails
  PCI: acpiphp: Move host bridge hotplug to pci_root.c
  PCI/ACPI: acpiphp: Rename alloc_acpiphp_hp_work() to alloc_acpi_hp_work()
  PCI: Make device create/destroy logic symmetric
  PCI: Fix reference count leak in pci_dev_present()
  PCI: Set pci_dev dev_node early so IOAPIC irq_descs are allocated locally
  PCI: Add root bus children dev's res to fail list
  PCI: acpiphp: Add is_hotplug_bridge detection

Conflicts:
	drivers/pci/pci.h
2013-01-26 17:35:58 -07:00
Bjorn Helgaas
fb455792d9 Merge branch 'pci/acpi-scan2' into next
* pci/acpi-scan2:
  ACPI / scan: Drop acpi_bus_add() and use acpi_bus_scan() instead
  ACPI: update ej_event interface to take acpi_device
  ACPI / scan: Add second pass to acpi_bus_trim()
  ACPI / scan: Change the implementation of acpi_bus_trim()
  ACPI / scan: Drop the second argument of acpi_bus_trim()
  ACPI / scan: Drop the second argument of acpi_device_unregister()
  ACPI: Remove the ops field from struct acpi_device
  ACPI: remove unused acpi_op_bind and acpi_op_unbind
  ACPI / scan: Fix check of device_attach() return value.
2013-01-26 17:35:05 -07:00
Bjorn Helgaas
14b5cb37cc Merge branch 'pci/yijing-ari' into next
* pci/yijing-ari:
  PCI: shpchp: Iterate over all devices in slot, not functions 0-7
  PCI: sgihp: Iterate over all devices in slot, not functions 0-7
  PCI: cpcihp: Iterate over all devices in slot, not functions 0-7
  PCI: pciehp: Iterate over all devices in slot, not functions 0-7
  PCI: Consolidate "next-function" functions
  PCI: Rename pci_enable_ari() to pci_configure_ari()
  PCI: Enable ARI if dev and upstream bridge support it; disable otherwise
2013-01-26 17:27:36 -07:00
Rafael J. Wysocki
cc38e51913 Merge branch 'acpi-scan' into acpi-cleanup
The following commits depend on the 'acpi-scan' material.
2013-01-26 00:36:44 +01:00
Rafael J. Wysocki
bfee26dba0 ACPI / scan: Make it clear that acpi_bus_trim() cannot fail
Since acpi_bus_trim() cannot fail, change its definition to a void
function, so that its callers don't check the return value in vain
and update the callers.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Yinghai Lu <yinghai@kernel.org>
Acked-by: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com>
Acked-by: Toshi Kani <toshi.kani@hp.com>
2013-01-26 00:27:44 +01:00
Yinghai Lu
d59f53bc9b PCI: acpiphp: Keep driver loaded even if no slots found
Could have root bus hot-added later and there may be slots that need
acpiphp.

The result returned by acpiphp_get_num_slots() is meaningless, because
the bridge the slots are under may be added after this function has been
called, so drop acpiphp_get_num_slots() and the code using it.

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2013-01-25 14:53:48 -07:00
Yinghai Lu
668192b678 PCI: acpiphp: Move host bridge hotplug to pci_root.c
The acpiphp driver is confusing because it contains partial support for PCI
host bridge hotplug as well as support for hotplug of PCI devices.

This patch moves the host bridge hot-add support to pci_root.c and adds
hot-remove support in pci_root.c.

How to test it: if sci_emu patch is applied, find out root bus number to
ACPI root name mapping from dmesg or /sys.  To remove root bus:

  echo "\_SB.PCIB 3" > /sys/kernel/debug/acpi/sci_notify

To add back root bus:

  echo "\_SB.PCIB 1" > /sys/kernel/debug/acpi/sci_notify

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2013-01-25 14:50:36 -07:00
Yinghai Lu
92d8aff3a3 PCI/ACPI: acpiphp: Rename alloc_acpiphp_hp_work() to alloc_acpi_hp_work()
Will need to use it for PCI root bridge hotplug support, so rename
*acpiphp* to *acpi* and move to osc.c.  Also make kacpi_hotplug_wq static
after that.

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
CC: Len Brown <lenb@kernel.org>
CC: linux-acpi@vger.kernel.org
2013-01-25 14:43:22 -07:00
Yinghai Lu
1f96a965e3 PCI: acpiphp: Add is_hotplug_bridge detection
When system support hotplug bridge with children hotplug slots, we need
to make sure that parent bridge get preallocated resource so later when
device is plugged into children slot, those children devices will get
resource allocated.

We do not meet this problem, because for PCIe hotplug card, when acpiphp
is used, pci_scan_bridge will set that for us when detect hotplug bit in
slot cap.

Reported-and-tested-by: Jason Baron <jbaron@redhat.com>
Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Jason Baron <jbaron@redhat.com>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2013-01-25 11:30:47 -07:00
Yijing Wang
fcbed0bcb2 PCI: shpchp: Iterate over all devices in slot, not functions 0-7
Iterate through devices in a slot by using the upstream bridge's
"bus->devices" list instead of assuming they are functions 0-7.  It's
possible there are several slots on the same pci_bus, so restrict it to
only devices matching this slot's device number.

ARI (which allows functions 0-255) is a PCIe-only feature, and this is
a PCI hotplug driver, so we shouldn't find anything other than functions
0-7, but it's better to iterate the same way as other hotplug drivers.

[bhelgaas: changelog, check PCI_SLOT, fix shpchp_unconfigure_device()]
Signed-off-by: Yijing Wang <wangyijing@huawei.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
2013-01-25 09:23:08 -07:00