After remove the device from /sys, we have to rescan all or
find out the bridge and access /sys../device/rescan there.

this patch add /sys/.../pci_bus/.../rescan. So user can rescan more easy.
that is more clean and easy to understand.

like after remove 0000:c4:00.0, you can rescan 0000:c4 directly.

-v2: According to Jesse, use function instead of exposing attr, so could hide
	#ifdef in header file.
     also add code to remove rescan file in remove path.
-v3: GregKH pointed out that we should use dev_attrs to avoid racing.
     So add pcibus_attrs and make it to be member of pcibus_attrs.
-v4: Change name to pcibus_dev_attrs according to GregKH
Acked-by: NGreg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: NYinghai Lu <yinghai@kernel.org>
Signed-off-by: NJesse Barnes <jbarnes@virtuousgeek.org>

With Ram's fixes, this should be safe to do again.  So let's give it
another try.

BIOS separates IO ranges between several IOHs, and on some slots, BIOS
assigns resources to a bridge, but stops assigning resources to the
device under that bridge, because the device needs a big resource.

So:
1. allocate resources and record the failed device resources
2. clear the BIOS assigned resources of the parent bridge of failing device
3. go back and call pci assign unassigned
4. if it still fails, go up the tree, clear more bridges. and try again

Now Ram's allocate requested resource already got into mainline. could
put this one again.
Reviewed-by: NRam Pai <linuxram@us.ibm.com>
Signed-off-by: NYinghai Lu <yinghai@kernel.org>
Signed-off-by: NJesse Barnes <jbarnes@virtuousgeek.org>

Store the device saved state so that we can reload the device back
to the original state when it's unassigned.  This has the benefit
that the state survives across pci_reset_function() calls via
the PCI sysfs reset interface while the VM is using the device.
Signed-off-by: NAlex Williamson <alex.williamson@redhat.com>
Acked-by: NAvi Kivity <avi@redhat.com>
Signed-off-by: NJesse Barnes <jbarnes@virtuousgeek.org>

For KVM device assignment, we'd like to save off the state of a device
prior to passing it to the guest and restore it later.  We also want
to allow pci_reset_funciton() to be called while the device is owned
by the guest.  This however overwrites and invalidates the struct pci_dev
buffers, so we can't just manually call save and restore.  Add generic
interfaces for the saved state to be stored and reloaded back into
struct pci_dev at a later time.
Signed-off-by: NAlex Williamson <alex.williamson@redhat.com>
Signed-off-by: NJesse Barnes <jbarnes@virtuousgeek.org>

This will allow us to store and load it later.
Signed-off-by: NAlex Williamson <alex.williamson@redhat.com>
Signed-off-by: NJesse Barnes <jbarnes@virtuousgeek.org>

Need to use it in _e1000e_disable_aspm.  This routine is used for error
recovery, where the pci_bus_sem is already held, and we don't want
pci_disable_link_state to try to take it again.  So add a locked variant
for use in cases like this.

Found lock up:

[ 2374.654557] kworker/32:1    D ffff881027f6b0f0     0  6075      2 0x00000000
[ 2374.654816]  ffff88503f099a68 0000000000000046 ffff88503f098000 0000000000004000
[ 2374.654837]  00000000001d1ec0 ffff88503f099fd8 00000000001d1ec0 ffff88503f099fd8
[ 2374.654860]  0000000000004000 00000000001d1ec0 ffff88503dcc8000 ffff88503f090000
[ 2374.654880] Call Trace:
[ 2374.654898]  [<ffffffff810b1302>] ? __lock_acquired+0x3a/0x224
[ 2374.654914]  [<ffffffff81c2b59c>] ? _raw_spin_unlock_irq+0x30/0x36
[ 2374.654925]  [<ffffffff810b069d>] ? trace_hardirqs_on_caller+0x1f/0x178
[ 2374.654936]  [<ffffffff81c2ab24>] rwsem_down_failed_common+0xd3/0x103
[ 2374.654945]  [<ffffffff810b158f>] ? __lock_contended+0x3a/0x2a2
[ 2374.654955]  [<ffffffff81c2ab7b>] rwsem_down_read_failed+0x12/0x14
[ 2374.654967]  [<ffffffff813371e4>] call_rwsem_down_read_failed+0x14/0x30
[ 2374.654981]  [<ffffffff8135df20>] ? pci_disable_link_state+0x5f/0xf5
[ 2374.654990]  [<ffffffff81c2a0e6>] ? down_read+0x7e/0x91
[ 2374.654999]  [<ffffffff8135df20>] ? pci_disable_link_state+0x5f/0xf5
[ 2374.655008]  [<ffffffff8135df20>] pci_disable_link_state+0x5f/0xf5
[ 2374.655024]  [<ffffffff81661796>] e1000e_disable_aspm+0x55/0x5a
[ 2374.655037]  [<ffffffff816677eb>] e1000_io_slot_reset+0x59/0xea
[ 2374.655048]  [<ffffffff8135fe0d>] ? report_mmio_enabled+0x5d/0x5d
[ 2374.655057]  [<ffffffff8135fe3b>] report_slot_reset+0x2e/0x5d
[ 2374.655072]  [<ffffffff8135369e>] pci_walk_bus+0x8a/0xb7
[ 2374.655081]  [<ffffffff8135fe0d>] ? report_mmio_enabled+0x5d/0x5d
[ 2374.655091]  [<ffffffff813603be>] broadcast_error_message+0xa4/0xb2
[ 2374.655101]  [<ffffffff81352c71>] ? pci_bus_read_config_dword+0x72/0x80
[ 2374.655110]  [<ffffffff813606df>] do_recovery+0x9e/0xf9
[ 2374.655120]  [<ffffffff81360786>] handle_error_source+0x4c/0x51
[ 2374.655129]  [<ffffffff81360974>] aer_isr_one_error+0x1e9/0x21a
[ 2374.655138]  [<ffffffff81360a6c>] aer_isr+0xc7/0xcc
[ 2374.655147]  [<ffffffff813609a5>] ? aer_isr_one_error+0x21a/0x21a
[ 2374.655159]  [<ffffffff81096d9f>] process_one_work+0x237/0x3ec
[ 2374.655168]  [<ffffffff81096d10>] ? process_one_work+0x1a8/0x3ec
[ 2374.655178]  [<ffffffff8109728d>] worker_thread+0x17c/0x240
[ 2374.655186]  [<ffffffff810b0803>] ? trace_hardirqs_on+0xd/0xf
[ 2374.655196]  [<ffffffff81097111>] ? manage_workers+0xab/0xab
[ 2374.655209]  [<ffffffff8109c8ed>] kthread+0xa0/0xa8
[ 2374.655223]  [<ffffffff81c332d4>] kernel_thread_helper+0x4/0x10
[ 2374.655232]  [<ffffffff81c2b880>] ? retint_restore_args+0xe/0xe
[ 2374.655243]  [<ffffffff8109c84d>] ? __init_kthread_worker+0x5b/0x5b
[ 2374.655252]  [<ffffffff81c332d0>] ? gs_change+0xb/0xb

when aer happens,
pci_walk_bus already have down_read(&pci_bus_sem)...
then report_slot_reset
        ==> e1000_io_slot_reset
                ==> e1000e_disable_aspm
                        ==> pci_disable_link_state...

We can not use pci_disable_link_state, and it will try to hold pci_bus_sem again.

Try to have __pci_disable_link_state that will not need to hold pci_bus_sem.

-v2: change name to pci_disable_link_state_locked() according to Jesse.

[jbarnes: make sure new function is exported for modules]
Signed-off-by: NYinghai Lu <yinghai@kernel.org>
Signed-off-by: NJesse Barnes <jbarnes@virtuousgeek.org>

On various newer Intel systems the PCI bus(ses) the non-core devices
live on aren't getting announced by ACPI except through the bus range
covered by mmconfig. At least the i7core-edac driver depends on these
devices getting detected.

Mauro, could you check whether with this change the Xeon 55xx hack in
that driver can go away altogether, and with it the bogus exporting of
pcibios_scan_specific_bus()?
Signed-off-by: NJan Beulich <jbeulich@novell.com>
Cc: Mauro Carvalho Chehab <mchehab@redhat.com>
Cc: Aristeu Sergio <arozansk@redhat.com>
Signed-off-by: NJesse Barnes <jbarnes@virtuousgeek.org>

Latency tolerance reporting allows devices to send messages to the root
complex indicating their latency tolerance for snooped & unsnooped
memory transactions.  Add support for enabling & disabling this
feature, along with a routine to set the max latencies a device should
send upstream.
Signed-off-by: NJesse Barnes <jbarnes@virtuousgeek.org>

OBFF (optimized buffer flush/fill), where supported, can help improve
energy efficiency by giving devices information about when interrupts
and other activity will have a reduced power impact.  It requires
support from both the device and system (i.e. not only does the device
need to respond to OBFF messages, but the platform must be capable of
generating and routing them to the end point).
Signed-off-by: NJesse Barnes <jbarnes@virtuousgeek.org>

Add support to allow drivers to enable/disable ID-based ordering.  Where
supported, ID-based ordering can significantly improve the latency of
individual requests by preventing them from queueing up behind unrelated
traffic.
Signed-off-by: NJesse Barnes <jbarnes@virtuousgeek.org>

Devices which do not support PCI configuration space based power
management may not otherwise be enabled.
Signed-off-by: NIan Campbell <ian.campbell@citrix.com>
Signed-off-by: NJesse Barnes <jbarnes@virtuousgeek.org>

The following patch sets the MaxPayload setting to match the parent
reading when inserting a PCIE card into a hotplug slot.  On our system,
the upstream bridge is set to 256, but when inserting a card, the card
setting defaults to 128.  As soon as I/O is performed to the card it
starts receiving errors since the payload size is too small.
Reviewed-by: NKenji Kaneshige <kaneshige.kenji@jp.fujitsu.com>
Signed-off-by: NJordan Hargrave <jordan_hargrave@dell.com>
Signed-off-by: NJesse Barnes <jbarnes@virtuousgeek.org>

If an attempt to get _OSC control of the PCIe native features from the
BIOS fails, report the resulting mask of control flags the BIOS was
willing to grant in the error message.  Moreover, if the _OSC support
mask is insufficient for requesting control of the PCIe native features
or pcie_ports_disabled is set, print a diagnostic message containing the
_OSC support mask.  This helps to diagnose obscure _OSC-related problems
on a number machines.
Signed-off-by: NRafael J. Wysocki <rjw@sisk.pl>
Signed-off-by: NJesse Barnes <jbarnes@virtuousgeek.org>

This patch adds the LPC Controller DeviceIDs for the Intel Panther Point PCH.
Acked-by: NJean Delvare <khali@linux-fr.org>
Signed-off-by: NSeth Heasley <seth.heasley@intel.com>
Signed-off-by: NJesse Barnes <jbarnes@virtuousgeek.org>

Callers expect pci_user_{read,write}_config_*() to indicate errors by
returning negative values.  Prior to this change, the indicated routines
could return positive error codes (e.g. PCIBIOS_BAD_REGISTER_NUMBER)
which callers would mistakenly interpret as success.

This change converts any non-zero return from the mentioned routines
into unambiguous negative value return codes.
Signed-off-by: NGreg Thelen <gthelen@google.com>
Signed-off-by: NJesse Barnes <jbarnes@virtuousgeek.org>

pci_vpd_pci22_write() calls pci_vpd_pci22_wait() after writing
PCI_VPD_DATA and PCI_VPD_ADDR to wait for the VPD operation to complete.
The result pci_vpd_pci22_wait() was not checked for error.

This change checks for error.
Signed-off-by: NGreg Thelen <gthelen@google.com>
Signed-off-by: NJesse Barnes <jbarnes@virtuousgeek.org>

We were just lucky that ICH4_GPIO_EN and ICH6_GPIO_EN happen to have
the same value.
Signed-off-by: NJean Delvare <khali@linux-fr.org>
Signed-off-by: NJesse Barnes <jbarnes@virtuousgeek.org>

Signed-off-by: NJean Delvare <khali@linux-fr.org>
Signed-off-by: NJesse Barnes <jbarnes@virtuousgeek.org>

This workaround holds a dma32 buffer at early boot to prevent later
bootmem allocations from stealing it in the case of large RAM configs.

Now that x86 is using memblock, and the nobootmem wrapper does top-down
allocation, it's no longer necessary, so remove it.
Signed-off-by: NYinghai Lu <yinghai@kernel.org>
Signed-off-by: NJesse Barnes <jbarnes@virtuousgeek.org>

TI816X (common name for DM816x/C6A816x/AM389x family) devices configured
to boot as PCIe Endpoint have class code = 0. This makes kernel PCI bus
code to skip allocating BARs to these devices resulting into following
type of error when trying to enable them:

"Device 0000:01:00.0 not available because of resource collisions"

The device cannot be operated because of the above issue.

This patch adds a ID specific (TI VENDOR ID and 816X DEVICE ID based)
'early' fixup quirk to replace class code with
PCI_CLASS_MULTIMEDIA_VIDEO as class.
Signed-off-by: NHemant Pedanekar <hemantp@ti.com>
Signed-off-by: NJesse Barnes <jbarnes@virtuousgeek.org>

If it was preempted, and the variable aer_mask_override is changed
after the spin_unlock_irqrestore it will write an uninitialized
variable by the pci_write_config_dword() function.
Signed-off-by: NWanlong Gao <wanlong.gao@gmail.com>
Signed-off-by: NJesse Barnes <jbarnes@virtuousgeek.org>

Request_region should be used with release_region, not release_resource.

The local variables region and region2 are dropped and the calls to
release_resource are replaced with calls to release_region, using the first
two arguments of the corresponding calls to request_region.

The semantic match that finds this problem is as follows:
(http://coccinelle.lip6.fr/)

// <smpl>
@@
expression x,E;
@@
(
*x = request_region(...)
|
*x = request_mem_region(...)
)
... when != release_region(x)
    when != x = E
* release_resource(x);
// </smpl>
Signed-off-by: NJulia Lawall <julia@diku.dk>
Signed-off-by: NJesse Barnes <jbarnes@virtuousgeek.org>

The pci_pm_reset() function is not a very nice interface due to its
limitations and conditional behavior (e.g. it doesn't affect devices
in low-power states), but it cannot be simply dropped, because
existing device drivers may depend on it.  However, its behavior and
limitations should be well documented, so add an appropriate
kerneldoc comment to it.
Signed-off-by: NRafael J. Wysocki <rjw@sisk.pl>
Signed-off-by: NJesse Barnes <jbarnes@virtuousgeek.org>

Commit 2f671e2d allowed us to clear ASPM state when the FADT
tells us it isn't supported, but we don't put this into effect
if the aspm_policy is set to POLICY_POWERSAVE.  Enable the
state to be cleared regardless of policy.
Signed-off-by: NAlex Williamson <alex.williamson@redhat.com>
Signed-off-by: NJesse Barnes <jbarnes@virtuousgeek.org>

* 'drm-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/airlied/drm-2.6:
  drm/radeon/kms: pll tweaks for r7xx
  drm/nouveau: fix allocation of notifier object
  drm/nouveau: fix notifier memory corruption bug
  drm/nouveau: fix pinning of notifier block
  drm/nouveau: populate ttm_alloced with false, when it's not
  drm/nouveau: fix nv30 pcie boards
  drm/nouveau: split ramin_lock into two locks, one hardirq safe
  drm/radeon/kms: adjust evergreen display watermark setup
  drm/radeon/kms: add connectors even if i2c fails
  drm/radeon/kms: fix bad shift in atom iio table parser

Prefer min m to max p only on pre-r7xx asics.

Fixes:
https://bugs.freedesktop.org/show_bug.cgi?id=36197Signed-off-by: NAlex Deucher <alexdeucher@gmail.com>
Cc: stable@kernel.org
Signed-off-by: NDave Airlie <airlied@redhat.com>

* 'nouveau/drm-nouveau-fixes' of /ssd/git/drm-nouveau-next:
  drm/nouveau: fix allocation of notifier object
  drm/nouveau: fix notifier memory corruption bug
  drm/nouveau: fix pinning of notifier block
  drm/nouveau: populate ttm_alloced with false, when it's not
  drm/nouveau: fix nv30 pcie boards
  drm/nouveau: split ramin_lock into two locks, one hardirq safe

Commit 73412c38 ("drm/nouveau: allocate
kernel's notifier object at end of block") intended to align end of
notifier block to page boundary, but start of block was miscalculated
to be off by -16 bytes. Fix it.
Signed-off-by: NMarcin Slusarz <marcin.slusarz@gmail.com>
Cc: Ben Skeggs <bskeggs@redhat.com>
Signed-off-by: NBen Skeggs <bskeggs@redhat.com>

nouveau_bo_wr32 expects offset to be in words, but we pass value in bytes,
so after commit 73412c38 ("drm/nouveau: allocate
kernel's notifier object at end of block") we started to overwrite some memory
after notifier buffer object (previously m2mf_ntfy was always 0, so it didn't
matter it was a value in bytes).
Reported-by: NDominik Brodowski <linux@dominikbrodowski.net>
Reported-by: NNigel Cunningham <lkml@nigelcunningham.com.au>
Signed-off-by: NMarcin Slusarz <marcin.slusarz@gmail.com>
Cc: Ben Skeggs <bskeggs@redhat.com>
Cc: Pekka Paalanen <pq@iki.fi>
Cc: stable@kernel.org    [2.6.38]
Signed-off-by: NBen Skeggs <bskeggs@redhat.com>

Problem introduced with commit 6ba9a683Reported-by: NBob Gleitsmann <rjgleits@bellsouth.net>
Signed-off-by: NBen Skeggs <bskeggs@redhat.com>

Caught with kmemcheck on unrelated business.
Signed-off-by: NBen Skeggs <bskeggs@redhat.com>

Wasn't aware they even existed, apparently they do!  They're actually
AGP chips with a bridge as far as I can tell, which puts them in the
same boat as nv40/nv45.
Signed-off-by: NBen Skeggs <bskeggs@redhat.com>

Fixes a possible lock ordering reversal between context_switch_lock
and ramin_lock.
Signed-off-by: NBen Skeggs <bskeggs@redhat.com>
Reviewed-by: NFrancisco Jerez <currojerez@riseup.net>

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6: (51 commits)
  netfilter: ipset: Fix the order of listing of sets
  ip6_pol_route panic: Do not allow VLAN on loopback
  bnx2x: Fix port identification problem
  r8169: add Realtek as maintainer.
  ip: ip_options_compile() resilient to NULL skb route
  bna: fix memory leak during RX path cleanup
  bna: fix for clean fw re-initialization
  usbnet: Fix up 'FLAG_POINTTOPOINT' and 'FLAG_MULTI_PACKET' overlaps.
  iwlegacy: fix tx_power initialization
  Revert "tcp: disallow bind() to reuse addr/port"
  qlcnic: limit skb frags for non tso packet
  net: can: mscan: fix build breakage in mpc5xxx_can
  netfilter: ipset: set match and SET target fixes
  netfilter: ipset: bitmap:ip,mac type requires "src" for MAC
  sctp: fix oops while removed transport still using as retran path
  sctp: fix oops when updating retransmit path with DEBUG on
  net: Disable NETIF_F_TSO_ECN when TSO is disabled
  net: Disable all TSO features when SG is disabled
  sfc: Use rmb() to ensure reads occur in order
  ieee802154: Remove hacked CFLAGS in net/ieee802154/Makefile
  ...

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jbarnes/pci-2.6:
  PCI: pci-label: Fix build failure when CONFIG_NLS is set to 'm' by allmodconfig

Merge branch 'x86-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

* 'x86-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
  x86, gart: Make sure GART does not map physmem above 1TB
  x86, gart: Set DISTLBWALKPRB bit always
  x86, gart: Convert spaces to tabs in enable_gart_translation

Merge branch 'timer-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

* 'timer-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
  RTC: rtc-omap: Fix a leak of the IRQ during init failure
  posix clocks: Replace mutex with reader/writer semaphore

Merge branch 'perf-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

* 'perf-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
  perf, x86: Fix AMD family 15h FPU event constraints
  perf, x86: Fix pre-defined cache-misses event for AMD family 15h cpus
  perf evsel: Fix use of inherit
  perf hists browser: Fix seg fault when annotate null symbol

This reverts commit 35d9f510.

Quoth Jiri Slaby:
 "It fixes mmap when IOMMU is used on x86 only, but breaks architectures
  like ARM or PPC where virt_to_phys(dma_alloc_coherent) doesn't work.
  We need there dma_mmap_coherent or similar (the trickery what
  snd_pcm_default_mmap does but in some saner way).  But this cannot be
  done at this phase."
Requested-by: NJiri Slaby <jslaby@suse.cz>
Cc: Russell King - ARM Linux <linux@arm.linux.org.uk>
Cc: Janusz Krzysztofik <jkrzyszt@tis.icnet.pl>
Acked-by: NMauro Carvalho Chehab <mchehab@redhat.com>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>