Commit Graph

33 Commits

Author SHA1 Message Date
Yinghai Lu
3891b6acb4 PCI: Stop all children first, before removing all children
This restores the previous behavior of stopping all child devices before
removing any of them.  The current SR-IOV design, where removing the PF
also drops references on all the VFs, depends on having the VFs continue
to exist after having been stopped.

[bhelgaas: changelog]
Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
2012-09-20 17:37:23 -06:00
Bjorn Helgaas
a7479d7446 PCI: Leave normal LIST_POISON in deleted list entries
list_del() already sets next/prev to LIST_POISON1/LIST_POISON2, so we
don't need to do anything special here to prevent further list accesses.

Tested-by: Yijing Wang <wangyijing@huawei.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Yinghai Lu <yinghai@kernel.org>
2012-08-22 11:34:38 -06:00
Bjorn Helgaas
d563e2ccc8 PCI: Rename local variables to conventional names
"bus" is the conventional name for a "struct pci_bus *" variable.

Tested-by: Yijing Wang <wangyijing@huawei.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Yinghai Lu <yinghai@kernel.org>
2012-08-22 11:34:38 -06:00
Bjorn Helgaas
7990681ad8 PCI: Remove unused, commented-out, code
This removes unused code that was already commented out.

Tested-by: Yijing Wang <wangyijing@huawei.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Yinghai Lu <yinghai@kernel.org>
2012-08-22 11:31:53 -06:00
Bjorn Helgaas
282e1d655f PCI: Stop and remove devices in one pass
Previously, when we removed a PCI device, we made two passes over the
hierarchy rooted at the device.  In the first pass, we stopped all
the devices, and in the second, we removed them.

This patch combines the two passes into one so that we remove a device as
soon as it and all its children have been stopped.

Note that we previously stopped devices in reverse order and removed them
in forward order.  Now we stop and remove them in reverse order.

Tested-by: Yijing Wang <wangyijing@huawei.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Yinghai Lu <yinghai@kernel.org>
2012-08-22 11:31:48 -06:00
Bjorn Helgaas
2ed168eeb3 PCI: Fold stop and remove helpers into their callers
pci_stop_bus_devices() is only two lines of code and is only called by
pci_stop_bus_device(), so I think it's easier to read if we just fold it
into the caller.  Similarly for __pci_remove_behind_bridge().

Tested-by: Yijing Wang <wangyijing@huawei.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Yinghai Lu <yinghai@kernel.org>
2012-08-22 11:31:42 -06:00
Bjorn Helgaas
66455f5472 PCI: Use list_for_each_entry() for bus->devices traversal
Replace list_for_each() + pci_dev_b() with the simpler
list_for_each_entry().

Tested-by: Yijing Wang <wangyijing@huawei.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Yinghai Lu <yinghai@kernel.org>
2012-08-22 11:31:37 -06:00
Bjorn Helgaas
125e14bb35 PCI: Remove pci_stop_and_remove_behind_bridge()
The PCMCIA CardBus driver was the only user of
pci_stop_and_remove_behind_bridge(), and it now uses
pci_stop_and_remove_bus_device() instead, so remove this interface.

This removes exported symbol pci_stop_and_remove_behind_bridge.

Tested-by: Yijing Wang <wangyijing@huawei.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Yinghai Lu <yinghai@kernel.org>
2012-08-22 11:31:32 -06:00
Bjorn Helgaas
657c2077a2 PCI: Don't export stop_bus_device and remove_bus_device interfaces
The acpiphp hotplug driver was the only user of pci_stop_bus_device() and
__pci_remove_bus_device(), and it now uses pci_stop_and_remove_bus_device()
instead, so stop exposing these interfaces.

This removes these exported symbols:

    __pci_remove_bus_device
    pci_stop_bus_device

Tested-by: Yijing Wang <wangyijing@huawei.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Yinghai Lu <yinghai@kernel.org>
2012-08-22 11:31:26 -06:00
Yinghai Lu
f6dd68a77f PCI: release busn_res when removing bus
Release bus number resource when removing a bus.

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
2012-06-13 15:42:22 -06:00
Yinghai Lu
6b22cf3f35 PCI: export __pci_remove_bus_device
Don't switch to pci_remove_bus_device yet, keep the __ prefix for now
(the behavior is still the same: remove without stopping first).

This allows other out of tree users or pending patches to get notified
from compiler warning.

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
2012-02-27 12:16:55 -08:00
Yinghai Lu
6754b9e9c3 PCI: Rename pci_remove_behind_bridge to pci_stop_and_remove_behind_bridge
The old pci_remove_behind_bridge actually do stop and remove.

Make the name reflect that to reduce confusion.

Suggested-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
2012-02-27 12:14:55 -08:00
Yinghai Lu
210647af89 PCI: Rename pci_remove_bus_device to pci_stop_and_remove_bus_device
The old pci_remove_bus_device actually did stop and remove.

Make the name reflect that to reduce confusion.

This patch is done by sed scripts and changes back some incorrect
__pci_remove_bus_device changes.

Suggested-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
2012-02-27 12:12:18 -08:00
Yinghai Lu
ac205b7bb7 PCI: make sriov work with hotplug remove
When hot removing a pci express module that has a pcie switch and supports
SRIOV, we got:

[ 5918.610127] pciehp 0000:80:02.2:pcie04: pcie_isr: intr_loc 1
[ 5918.615779] pciehp 0000:80:02.2:pcie04: Attention button interrupt received
[ 5918.622730] pciehp 0000:80:02.2:pcie04: Button pressed on Slot(3)
[ 5918.629002] pciehp 0000:80:02.2:pcie04: pciehp_get_power_status: SLOTCTRL a8 value read 1f9
[ 5918.637416] pciehp 0000:80:02.2:pcie04: PCI slot #3 - powering off due to button press.
[ 5918.647125] pciehp 0000:80:02.2:pcie04: pcie_isr: intr_loc 10
[ 5918.653039] pciehp 0000:80:02.2:pcie04: pciehp_green_led_blink: SLOTCTRL a8 write cmd 200
[ 5918.661229] pciehp 0000:80:02.2:pcie04: pciehp_set_attention_status: SLOTCTRL a8 write cmd c0
[ 5924.667627] pciehp 0000:80:02.2:pcie04: Disabling domain🚌device=0000:b0:00
[ 5924.674909] pciehp 0000:80:02.2:pcie04: pciehp_get_power_status: SLOTCTRL a8 value read 2f9
[ 5924.683262] pciehp 0000:80:02.2:pcie04: pciehp_unconfigure_device: domain🚌dev = 0000:b0:00
[ 5924.693976] libfcoe_device_notification: NETDEV_UNREGISTER eth6
[ 5924.764979] libfcoe_device_notification: NETDEV_UNREGISTER eth14
[ 5924.873539] libfcoe_device_notification: NETDEV_UNREGISTER eth15
[ 5924.995209] libfcoe_device_notification: NETDEV_UNREGISTER eth16
[ 5926.114407] sxge 0000:b2:00.0: PCI INT A disabled
[ 5926.119342] BUG: unable to handle kernel NULL pointer dereference at (null)
[ 5926.127189] IP: [<ffffffff81353a3b>] pci_stop_bus_device+0x33/0x83
[ 5926.133377] PGD 0
[ 5926.135402] Oops: 0000 [#1] SMP
[ 5926.138659] CPU 2
[ 5926.140499] Modules linked in:
...
[ 5926.143754]
[ 5926.275823] Call Trace:
[ 5926.278267]  [<ffffffff81353a38>] pci_stop_bus_device+0x30/0x83
[ 5926.284180]  [<ffffffff81353af4>] pci_remove_bus_device+0x1a/0xba
[ 5926.290264]  [<ffffffff81366311>] pciehp_unconfigure_device+0x110/0x17b
[ 5926.296866]  [<ffffffff81365dd9>] ? pciehp_disable_slot+0x188/0x188
[ 5926.303123]  [<ffffffff81365d6f>] pciehp_disable_slot+0x11e/0x188
[ 5926.309206]  [<ffffffff81365e68>] pciehp_power_thread+0x8f/0xe0
...

 +-[0000:80]-+-00.0-[81-8f]--
 |           +-01.0-[90-9f]--
 |           +-02.0-[a0-af]--
 |           +-02.2-[b0-bf]----00.0-[b1-b3]--+-02.0-[b2]--+-00.0 Device
 |           |                               |            +-00.1 Device
 |           |                               |            +-00.2 Device
 |           |                               |            \-00.3 Device
 |           |                               \-03.0-[b3]--+-00.0 Device
 |           |                                            +-00.1 Device
 |           |                                            +-00.2 Device
 |           |                                            \-00.3 Device

root complex: 80:02.2
pci express modules: have pcie switch and are listed as b0:00.0, b1:02.0 and b1:03.0.
end devices  are b2:00.0 and b3.00.0.
VFs are: b2:00.1,... b2:00.3, and b3:00.1,...,b3:00.3

Root cause: when doing pci_stop_bus_device() with phys fn, it will stop
virt fn and remove the fn, so
	list_for_each_safe(l, n, &bus->devices)
will have problem to refer freed n that is pointed to vf entry.

Solution is just replacing list_for_each_safe() with
list_for_each_prev_safe().  This will make sure we can get valid n pointer
to PF instead of the freed VF pointer (because newly added devices are
inserted to the bus->devices list tail).

During reviewing the patch, Bjorn said:
|   The PCI hot-remove path calls pci_stop_bus_devices() via
|   pci_remove_bus_device().
|
|   pci_stop_bus_devices() traverses the bus->devices list (point A below),
|   stopping each device in turn, which calls the driver remove() method.  When
|   the device is an SR-IOV PF, the driver calls pci_disable_sriov(), which
|   also uses pci_remove_bus_device() to remove the VF devices from the
|   bus->devices list (point B).
|
|       pci_remove_bus_device
|         pci_stop_bus_device
|           pci_stop_bus_devices(subordinate)
|             list_for_each(bus->devices)             <-- A
|               pci_stop_bus_device(PF)
|                 ...
|                   driver->remove
|                     pci_disable_sriov
|                       ...
|                         pci_remove_bus_device(VF)
|                             <remove from bus_list>  <-- B
|
|   At B, we're changing the same list we're iterating through at A, so when
|   the driver remove() method returns, the pci_stop_bus_devices() iterator has
|   a pointer to a list entry that has already been freed.

Discussion thread can be found : https://lkml.org/lkml/2011/10/15/141
				 https://lkml.org/lkml/2012/1/23/360

-v5: According to Linus to make remove more robust, Change to
     list_for_each_prev_safe instead. That is more reasonable, because
     those devices are added to tail of the list before.

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
2012-02-14 08:44:59 -08:00
Yinghai Lu
3682a3946d PCI: Fix pci cardbus removal
During test busn_res allocation with cardbus, found pci card removal is not
working anymore, and it turns out it is broken by:

|commit 79cc9601c3
|Date:   Tue Nov 22 21:06:53 2011 -0800
|
|    PCI: Only call pci_stop_bus_device() one time for child devices at remove

The above changed the behavior of pci_remove_behind_bridge that
yenta_cardbus depended on.  So restore the old behavoir of
pci_remove_behind_bridge (which requires stopping and removing of all
devices) by:

1. rename pci_remove_behind_bridge to __pci_remove_behind_bridge, and let
   __pci_remove_bus_device() call it instead.
2. add pci_stop_behind_bridge that will stop devices behind a bridge
3. add back pci_remove_behind_bridge that will stop and remove devices
   under bridge.

-v2: update commit description a little bit.

Tested-by: Dominik Brodowski <linux@dominikbrodowski.net>
Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
2012-02-10 12:19:31 -08:00
Yinghai Lu
79cc9601c3 PCI: Only call pci_stop_bus_device() one time for child devices at remove
During debugging pcie hotplug with SRIOV with pcie switch, I found
pci_stop_bus_device() is called several times for some child devices.

So change original pci_remove_bus_device() to __pci_remove_bus_device(),
and make it only do remove work, and add a new pci_remove_bus_device
that calls pci_stop_bus_device() one time, and then call
__pci_remove_bus_device().

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
2012-01-06 12:10:48 -08:00
Yinghai Lu
dc2c2c9dd5 PCI/sysfs: move bus cpuaffinity to class dev_attrs
Requested by Greg KH to fix a race condition in the creating of PCI bus
cpuaffinity files.

Acked-by: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
2011-05-21 12:17:13 -07:00
Alex Chiang
af4c5f985a PCI: eliminate redundant pci_stop_dev() call from pci_destroy_dev()
We always call pci_stop_bus_device before calling pci_destroy_dev.

Since pci_stop_bus_device calls pci_stop_dev, there is no need
for pci_destroy_dev to repeat the call.

Signed-off-by: Alex Chiang <achiang@hp.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
2009-06-11 12:04:19 -07:00
Kenji Kaneshige
7ae0567fd3 PCI: fix kernel oops on bridge removal
Fix the following kernel oops problem that happens when removing PCI
bridge with pciehp loaded. It should also occur with other hotplug
driver that is implemented as a bridge's driver.

[  459.997257] pciehp 0000:2f:04.0:pcie24: unloading service driver pciehp
[  459.997495] general protection fault: 0000 [#1] SMP
[  459.997737] last sysfs file: /sys/devices/pci0000:00/0000:00:04.0/0000:2e:00.0/0000:2f:04.0/remove
[  459.997964] CPU 4
[  459.998129] Modules linked in: pciehp ipv6 autofs4 hidp rfcomm l2cap bluetooth sunrpc cpufreq_ondemand acpi_cpufreq dm_mirror dm_region_hash dm_log dm_multipath scsi_dh dm_mod sbs sbshc battery ac parport_pc lp parport mptspi mptscsih mptbase scsi_transport_spi e1000e sg sr_mod cdrom button serio_raw i2c_i801 i2c_core shpchp pcspkr ata_piix libata megaraid_sas sd_mod scsi_mod crc_t10dif ext3 jbd uhci_hcd ohci_hcd ehci_hcd [last unloaded: microcode]
[  459.998129] Pid: 56, comm: events/4 Not tainted 2.6.29-rc8-kk #1 PRIMERGY
[  459.998129] RIP: 0010:[<ffffffff803bf047>]  [<ffffffff803bf047>] pci_slot_release+0x37/0x100
[  459.998129] RSP: 0018:ffff88083b3bf9e0  EFLAGS: 00010246
[  459.998129] RAX: ffff88083adc5158 RBX: ffff880836c1bc80 RCX: 6b6b6b6b6b6b6b6b
[  459.998129] RDX: 0000000000000000 RSI: ffffffff803a77f0 RDI: ffff880836c1bc48
[  459.998129] RBP: ffff88083b3bfa00 R08: 0000000000000002 R09: 0000000000000000
[  459.998129] R10: 0000000000000000 R11: 0000000000000000 R12: ffff880836c1bc48
[  459.998129] R13: ffff880836c1bc20 R14: ffff880836c1bc48 R15: ffff880836d1ec38
[  459.998129] FS:  0000000000000000(0000) GS:ffff88083ccc3770(0000) knlGS:0000000000000000
[  459.998129] CS:  0010 DS: 0018 ES: 0018 CR0: 000000008005003b
[  459.998129] CR2: 00007f1562f1d558 CR3: 0000000838090000 CR4: 00000000000006e0
[  459.998129] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[  459.998129] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[  459.998129] Process events/4 (pid: 56, threadinfo ffff88083b3be000, task ffff88083b3b3e40)
[  459.998129] Stack:
[  459.998129]  ffff880836c1bc80 ffff880836c1bc48 ffffffff80793320 ffff88083b0d0960
[  459.998129]  ffff88083b3bfa30 ffffffff803a788a ffff880836c1bc80 ffffffff803a77f0
[  459.998129]  ffff880836c1bc20 ffff880836d1ec38 ffff88083b3bfa50 ffffffff803a8ce7
[  459.998129] Call Trace:
[  459.998129]  [<ffffffff803a788a>] kobject_release+0x9a/0x290
[  459.998129]  [<ffffffff803a77f0>] ? kobject_release+0x0/0x290
[  459.998129]  [<ffffffff803a8ce7>] kref_put+0x37/0x80
[  459.998129]  [<ffffffff803a76f7>] kobject_put+0x27/0x60
[  459.998129]  [<ffffffff803bebcc>] ? pci_destroy_slot+0x3c/0xc0
[  459.998129]  [<ffffffff803bebd5>] pci_destroy_slot+0x45/0xc0
[  459.998129]  [<ffffffff803c797d>] pci_hp_deregister+0x13d/0x210
[  459.998129]  [<ffffffffa031141d>] cleanup_slots+0x2d/0x80 [pciehp]
[  459.998129]  [<ffffffffa0311735>] pciehp_remove+0x15/0x30 [pciehp]
[  459.998129]  [<ffffffff803c4c99>] pcie_port_remove_service+0x69/0x90
[  459.998129]  [<ffffffff80441da9>] __device_release_driver+0x59/0x90
[  459.998129]  [<ffffffff80441edb>] device_release_driver+0x2b/0x40
[  459.998129]  [<ffffffff804419d6>] bus_remove_device+0xa6/0x120
[  459.998129]  [<ffffffff8043e46b>] device_del+0x12b/0x190
[  459.998129]  [<ffffffff803c4d90>] ? remove_iter+0x0/0x40
[  459.998129]  [<ffffffff8043e4f6>] device_unregister+0x26/0x70
[  459.998129]  [<ffffffff803c4dbf>] remove_iter+0x2f/0x40
[  459.998129]  [<ffffffff8043ddf3>] device_for_each_child+0x33/0x60
[  459.998129]  [<ffffffff8033ee30>] ? sysfs_schedule_callback_work+0x0/0x50
[  459.998129]  [<ffffffff803c4d30>] pcie_port_device_remove+0x30/0x80
[  459.998129]  [<ffffffff803c55a1>] pcie_portdrv_remove+0x11/0x20
[  459.998129]  [<ffffffff803bfeb2>] pci_device_remove+0x32/0x70
[  459.998129]  [<ffffffff80441da9>] __device_release_driver+0x59/0x90
[  459.998129]  [<ffffffff80441edb>] device_release_driver+0x2b/0x40
[  459.998129]  [<ffffffff804419d6>] bus_remove_device+0xa6/0x120
[  459.998129]  [<ffffffff8043e46b>] device_del+0x12b/0x190
[  459.998129]  [<ffffffff8043e4f6>] device_unregister+0x26/0x70
[  459.998129]  [<ffffffff803ba969>] pci_stop_dev+0x49/0x60
[  459.998129]  [<ffffffff803baab0>] pci_remove_bus_device+0x40/0xc0
[  459.998129]  [<ffffffff803c10d9>] remove_callback+0x29/0x40
[  459.998129]  [<ffffffff8033ee4f>] sysfs_schedule_callback_work+0x1f/0x50
[  459.998129]  [<ffffffff8025769a>] run_workqueue+0x15a/0x230
[  459.998129]  [<ffffffff80257648>] ? run_workqueue+0x108/0x230
[  459.998129]  [<ffffffff8025846f>] worker_thread+0x9f/0x100
[  459.998129]  [<ffffffff8025bce0>] ? autoremove_wake_function+0x0/0x40
[  459.998129]  [<ffffffff802583d0>] ? worker_thread+0x0/0x100
[  459.998129]  [<ffffffff8025b89d>] kthread+0x4d/0x80
[  459.998129]  [<ffffffff8020d4ba>] child_rip+0xa/0x20
[  459.998129]  [<ffffffff8020cebc>] ? restore_args+0x0/0x30
[  459.998129]  [<ffffffff8025b850>] ? kthread+0x0/0x80
[  459.998129]  [<ffffffff8020d4b0>] ? child_rip+0x0/0x20
[  459.998129] Code: 56 49 89 fe 41 55 4c 8d 6f d8 41 54 53 74 09 f6 05 b8 05 c7 00 08 75 72 49 8b 45 00 48 8b 48 28 eb 05 66 90 48 89 f1 49 8b 45 00 <48> 8b 31 48 83 c0 28 0f 18 0e 48 39 c1 74 1c 8b 41 38 41 0f b6
[  459.998129] RIP  [<ffffffff803bf047>] pci_slot_release+0x37/0x100
[  459.998129]  RSP <ffff88083b3bf9e0>
[  460.018595] ---[ end trace 5a08d2095374aedc ]---

The pci_remove_bus_device() removes all buses and devices under the
bridge, and then removes the bridge. So the remove() callback of the
hotplug drivers implemented as a bridge's driver is executed after the
struct pci_bus of the bridge's secondary bus is removed. The remove()
callback of those driver unregisters the slot using pci_destroy_slot(),
and slot's release callback refers to the the struct pci_bus that was
already freed. This is the cause of the kernel oops.

This patch solves the problem by stopping bus drivers before removing the
bridge and its child bus and devices.

Acked-by: Alex Chiang <achiang@hp.com>
Signed-off-by: Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
2009-03-26 15:55:18 -07:00
Yu Zhao
2b56313448 PCI: check if a bus is added when removing it
When removing a bus, 'is_added' should be checked to make sure the
bus has been successfully added by pci_bus_add_child() who will sets
'is_added'.

Signed-off-by: Yu Zhao <yu.zhao@intel.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
2009-03-19 19:29:26 -07:00
Stephen Hemminger
11d587429e PCI: fix sparse warning in pci_remove_behind_bridge
Get rid of the second definition of dev which hides the earlier one in
the argument list and causes a warning from sparse.

Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
2008-10-20 10:54:25 -07:00
Mike Travis
93ff68a55a PCI: make CPU list affinity visible
Stephen Hemminger wrote:
> Looks like Mike created cpulistaffinty in sysfs but never completed
> the job.

This patch hooks things up correctly, taking care to remove the new file
when the bus is destroyed.

Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Signed-off-by: Mike Travis <travis@sgi.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
2008-10-20 10:53:51 -07:00
Shaohua Li
7d715a6c1a PCI: add PCI Express ASPM support
PCI Express ASPM defines a protocol for PCI Express components in the D0
state to reduce Link power by placing their Links into a low power state
and instructing the other end of the Link to do likewise. This
capability allows hardware-autonomous, dynamic Link power reduction
beyond what is achievable by software-only controlled power management.
However, The device should be configured by software appropriately.
Enabling ASPM will save power, but will introduce device latency.

This patch adds ASPM support in Linux. It introduces a global policy for
ASPM, a sysfs file /sys/module/pcie_aspm/parameters/policy can control
it. The interface can be used as a boot option too. Currently we have
below setting:
        -default, BIOS default setting
        -powersave, highest power saving mode, enable all available ASPM
state and clock power management
        -performance, highest performance, disable ASPM and clock power
management
By default, the 'default' policy is used currently.

In my test, power difference between powersave mode and performance mode
is about 1.3w in a system with 3 PCIE links.

Note: some devices might not work well with aspm, either because chipset
issue or device issue. The patch provide API (pci_disable_link_state),
driver can disable ASPM for specific device.

Signed-off-by: Shaohua Li <shaohua.li@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2008-04-20 21:47:03 -07:00
Greg Kroah-Hartman
5ff580c10e PCI: remove global list of PCI devices
This patch finally removes the global list of PCI devices.  We are
relying entirely on the list held in the driver core now, and do not
need a separate "shadow" list as no one uses it.

Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2008-04-20 21:47:02 -07:00
Greg Kroah-Hartman
8a1bc9013a PCI: add is_added flag to struct pci_dev
This lets us check if the device is really added to the driver core or
not, which is what we need when walking some of the bus lists.  The flag
is there in anticipation of getting rid of the other PCI device list,
which is what we used to check in this situation.

Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2008-04-20 21:47:00 -07:00
Greg Kroah-Hartman
cc3a1378b4 Revert "PCI: PCIE ASPM support"
This reverts commit 6c723d5bd8.

It caused build errors on non-x86 platforms, config file confusion, and
even some boot errors on some x86-64 boxes.  All around, not quite ready
for prime-time :(

Cc: Shaohua Li <shaohua.li@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2008-02-02 11:32:01 -08:00
Greg Kroah-Hartman
fd7d1ced29 PCI: make pci_bus a struct device
This moves the pci_bus class device to be a real struct device and at
the same time, place it in the device tree in the correct location.

Note, the old "bridge" symlink is now gone, but this was a non-standard
link and no userspace program used it.  If you need to determine the
device that the bus is on, follow the standard device symlink, or walk
up the device tree.


Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2008-02-01 15:04:31 -08:00
Shaohua Li
6c723d5bd8 PCI: PCIE ASPM support
PCI Express ASPM defines a protocol for PCI Express components in the D0
state to reduce Link power by placing their Links into a low power state
and instructing the other end of the Link to do likewise. This
capability allows hardware-autonomous, dynamic Link power reduction
beyond what is achievable by software-only controlled power management.
However, The device should be configured by software appropriately.
Enabling ASPM will save power, but will introduce device latency.

This patch adds ASPM support in Linux. It introduces a global policy for
ASPM, a sysfs file /sys/module/pcie_aspm/parameters/policy can control
it. The interface can be used as a boot option too. Currently we have
below setting:
        -default, BIOS default setting
        -powersave, highest power saving mode, enable all available ASPM
state
and clock power management
        -performance, highest performance, disable ASPM and clock power
management
By default, the 'default' policy is used currently.

In my test, power difference between powersave mode and performance mode
is about 1.3w in a system with 3 PCIE links.

Signed-off-by: Shaohua Li <shaohua.li@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2008-02-01 15:04:30 -08:00
Satoru Takeuchi
24f8aa9b46 PCI: add pci_stop_bus_device
This patch adds pci_stop_bus_device() which stops a PCI device (detach
the driver, remove from the global list and so on) and any children.
This is needed for ACPI based PCI-to-PCI bridge hot-remove, and it will
be also needed for ACPI based PCI root bridge hot-remove.

Signed-off-by: Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com>
Signed-off-by: MUNEDA Takahiro <muneda.takahiro@jp.fujitsu.com>
Signed-off-by: Satoru Takeuchi <takeuchi_satoru@jp.fujitsu.com>
Signed-off-by: Kristen Carlson Accardi <kristen.c.accardi@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2006-09-26 17:43:54 -07:00
Zhang Yanmin
d71374dafb [PATCH] PCI: fix race with pci_walk_bus and pci_destroy_dev
pci_walk_bus has a race with pci_destroy_dev. When cb is called
in pci_walk_bus, pci_destroy_dev might unlink the dev pointed by next.
Later on in the next loop, pointer next becomes NULL and cause
kernel panic.

Below patch against 2.6.17-rc4 fixes it by changing pci_bus_lock (spin_lock)
to pci_bus_sem (rw_semaphore).

Signed-off-by: Zhang Yanmin <yanmin.zhang@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2006-06-21 12:00:01 -07:00
Adrian Bunk
54c762fe62 [PATCH] PCI: drivers/pci: some cleanups
This patch contains the following cleanups:
- hotplug/pciehp_core.c: make the needlessly global hpdriver_context
                         static
- #if 0 the following unused functions:
  - pci.c: pci_bus_max_busnr()
  - pci.c: pci_max_busnr()
  - proc.c: pci_proc_attach_bus()
  - remove.c: pci_remove_device_safe

Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2006-01-09 12:13:20 -08:00
Rajesh Shah
091ca9f063 [PATCH] acpi bridge hotadd: Make the PCI remove routines safe for failed hot-plug
When a root bridge hierarchy is hot-plugged, resource requirements for the new
devices may be greater than what the root bridge is decoding.  In this case,
we want to remove devices that did not get needed resources.  These devices
have been scanned into bus specific lists but not yet added to the global
device list.  Make sure the pci remove functions can handle this case.

Signed-off-by: Rajesh Shah <rajesh.shah@intel.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2005-06-27 21:52:41 -07:00
Linus Torvalds
1da177e4c3 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!
2005-04-16 15:20:36 -07:00