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Date: Mon, 23 Jan 2012 12:48:29 -0800
From: Yinghai Lu <yinghai@...nel.org>
To: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Jesse Barnes <jbarnes@...tuousgeek.org>,
Kenji Kaneshige <kaneshige.kenji@...fujitsu.com>,
Matthew Wilcox <matthew@....cx>, linux-pci@...r.kernel.org,
linux-kernel@...r.kernel.org,
Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Subject: Re: [PATCH 1/7] PCI: Make sriov work with hotplug remove
On Mon, Jan 23, 2012 at 11:59 AM, Yinghai Lu <yinghai@...nel.org> wrote:
> On Mon, Jan 23, 2012 at 11:34 AM, Linus Torvalds
> <torvalds@...ux-foundation.org> wrote:
>> (b) if that isn't an option, and the virtual devices make a mess, at
>> least don't make the code uglier, just do something like:
>>
>> while (!list_empty(&bus->devices)) {
>> struct pci_dev *dev = list_first_entry(struct pci_dev, bus_list);
>>
>> pci_stop_bus_device(dev);
>> }
>>
>> which at least isn't butt ugly. Add a large comment about how
>> pci_stop_bus_device() can remove multiple devices due to the virtual
>> devices having been done badly.
>
> yes, this one should work and less confusing.
---
drivers/pci/remove.c | 11 ++++++++---
1 file changed, 8 insertions(+), 3 deletions(-)
Index: linux-2.6/drivers/pci/remove.c
===================================================================
--- linux-2.6.orig/drivers/pci/remove.c
+++ linux-2.6/drivers/pci/remove.c
@@ -126,10 +126,15 @@ void pci_remove_behind_bridge(struct pci
static void pci_stop_bus_devices(struct pci_bus *bus)
{
- struct list_head *l, *n;
+ /*
+ * VFs are removed by pci_remove_bus_device() in the
+ * pci_stop_bus_devices() code path for PF.
+ * aka, bus->devices get updated in the process.
+ */
+ while (!list_empty(&bus->devices)) {
+ struct pci_dev *dev;
- list_for_each_safe(l, n, &bus->devices) {
- struct pci_dev *dev = pci_dev_b(l);
+ dev = list_first_entry(&bus->devices, struct pci_dev, bus_list);
pci_stop_bus_device(dev);
}
}
it does not work... get lock up
sca21d-0a86d3bf:~ # echo 0 > /sys/bus/pci/slots/3/power
[ 145.027439] pciehp 0000:80:02.2:pcie04: disable_slot: physical_slot = 3
[ 145.034329] pciehp 0000:80:02.2:pcie04: pciehp_get_power_status:
SLOTCTRL a8 value read 1f9
[ 145.042709] pciehp 0000:80:02.2:pcie04: pciehp_unconfigure_device:
domain:bus:dev = 0000:b0:00
[ 145.053636] libfcoe_device_notification: NETDEV_UNREGISTER eth6
[ 145.132359] libfcoe_device_notification: NETDEV_UNREGISTER eth14
[ 145.203456] free irq_desc for 273
[ 145.207012] free irq_desc for 274
[ 145.210538] free irq_desc for 275
[ 145.214094] free irq_desc for 276
[ 145.217642] free irq_desc for 277
[ 145.221188] free irq_desc for 278
[ 145.224727] free irq_desc for 279
[ 145.233569] libfcoe_device_notification: NETDEV_UNREGISTER eth15
[ 145.311168] free irq_desc for 280
[ 145.314768] free irq_desc for 281
[ 145.318296] free irq_desc for 282
[ 145.321857] free irq_desc for 283
[ 145.325412] free irq_desc for 284
[ 145.328965] free irq_desc for 285
[ 145.332505] free irq_desc for 286
[ 145.337528] libfcoe_device_notification: NETDEV_UNREGISTER eth16
[ 145.423045] free irq_desc for 287
[ 145.426643] free irq_desc for 288
[ 145.430164] free irq_desc for 289
[ 145.433716] free irq_desc for 290
[ 145.437257] free irq_desc for 291
[ 145.440808] free irq_desc for 292
[ 145.444355] free irq_desc for 293
[ 146.449844] free irq_desc for 217
[ 146.453458] free irq_desc for 218
[ 146.456994] free irq_desc for 219
[ 146.460566] free irq_desc for 220
[ 146.464123] free irq_desc for 221
[ 146.467675] free irq_desc for 222
[ 146.471245] free irq_desc for 223
[ 171.286565] BUG: soft lockup - CPU#2 stuck for 22s! [bash:10294]
[ 171.292570] Modules linked in:
[ 171.295644] irq event stamp: 107478
[ 171.299132] hardirqs last enabled at (107477):
[<ffffffff81ceaadd>] restore_args+0x0/0x30
[ 171.307424] hardirqs last disabled at (107478):
[<ffffffff81cf20eb>] apic_timer_interrupt+0x6b/0x80
[ 171.316495] softirqs last enabled at (107476):
[<ffffffff8106e59c>] __do_softirq+0x195/0x1ab
[ 171.325046] softirqs last disabled at (107461):
[<ffffffff81cf2adc>] call_softirq+0x1c/0x30
[ 171.333417] CPU 2
[ 171.335260] Modules linked in:
[ 171.338518]
[ 171.340023] Pid: 10294, comm: bash Not tainted
3.3.0-rc1-tip-yh-01748-g1b96060-dirty #143 Oracle Corporation Sun
Blade X6270 M3/BD,ASSY,
[ 171.352330] RIP: 0010:[<ffffffff813c9a6a>] [<ffffffff813c9a6a>]
pci_stop_bus_device+0x66/0x78
[ 171.360971] RSP: 0018:ffff8820330dfce8 EFLAGS: 00000286
[ 171.366285] RAX: ffff881036485000 RBX: 0000000000000002 RCX: 00000000000003bd
[ 171.373408] RDX: 0000000000000000 RSI: 0000000000000002 RDI: ffff881036471000
[ 171.380532] RBP: ffff8820330dfd08 R08: 0000000000000002 R09: ffff88202c330740
[ 171.387657] R10: 0000000bfc77a084 R11: ffff88202c3306d0 R12: 0000000bfc77a084
[ 171.394788] R13: ffff88202c3306d0 R14: ffffffff81ceaadd R15: ffffffff810af1b9
[ 171.401914] FS: 00007f07c4d7a700(0000) GS:ffff88103e200000(0000)
knlGS:0000000000000000
[ 171.410005] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 171.415745] CR2: 00007fd6b37000a0 CR3: 00000010310f1000 CR4: 00000000000407e0
[ 171.422869] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 171.429994] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[ 171.437125] Process bash (pid: 10294, threadinfo ffff8820330de000,
task ffff88202c330000)
[ 171.445294] Stack:
[ 171.447304] 0000000000000000 ffff88103645f000 ffff881036485000
ffff881036485028
[ 171.454748] ffff8820330dfd38 ffffffff813c9a2b 0000000000000007
ffff88103645e000
[ 171.462191] ffff881036484800 ffff881036484828 ffff8820330dfd68
ffffffff813c9a2b
[ 171.469647] Call Trace:
[ 171.472100] [<ffffffff813c9a2b>] pci_stop_bus_device+0x27/0x78
[ 171.478011] [<ffffffff813c9a2b>] pci_stop_bus_device+0x27/0x78
[ 171.483940] [<ffffffff813c9bc0>] pci_remove_bus_device+0x14/0x24
[ 171.490036] [<ffffffff813dbb66>] pciehp_unconfigure_device+0x107/0x16d
[ 171.496648] [<ffffffff813db5d9>] pciehp_disable_slot+0x11e/0x186
[ 171.502733] [<ffffffff813db88c>] pciehp_sysfs_disable_slot+0x68/0x108
[ 171.509251] [<ffffffff813da9c9>] disable_slot+0x58/0x5c
[ 171.514556] [<ffffffff813d77dc>] power_write_file+0xd2/0x11c
[ 171.520295] [<ffffffff813d770a>] ? get_attention_status+0xae/0xae
[ 171.526471] [<ffffffff813d1a49>] pci_slot_attr_store+0x29/0x2b
[ 171.532389] [<ffffffff81194eec>] sysfs_write_file+0x10e/0x14a
[ 171.538218] [<ffffffff8113de25>] vfs_write+0xb5/0x128
[ 171.543356] [<ffffffff8113e081>] sys_write+0x4d/0x77
[ 171.548417] [<ffffffff81cf1652>] system_call_fastpath+0x16/0x1b
[ 171.554416] Code: 89 df e8 4d 7f 00 00 48 89 df e8 1b 6a 00 00 48
8d bb 90 00 00 00 e8 78 11 0c 00 80 a3 50 09 00 00 fb 48 8b 43 10 48
83 78 38 00 <74> 08 48 89 df e8 87 a3 00 00 58 5b 41 5c 41 5d 5d c3 55
48 89
[ 171.574366] Call Trace:
[ 171.576809] [<ffffffff813c9a2b>] pci_stop_bus_device+0x27/0x78
[ 171.582724] [<ffffffff813c9a2b>] pci_stop_bus_device+0x27/0x78
[ 171.588634] [<ffffffff813c9bc0>] pci_remove_bus_device+0x14/0x24
[ 171.594719] [<ffffffff813dbb66>] pciehp_unconfigure_device+0x107/0x16d
[ 171.601324] [<ffffffff813db5d9>] pciehp_disable_slot+0x11e/0x186
[ 171.607409] [<ffffffff813db88c>] pciehp_sysfs_disable_slot+0x68/0x108
[ 171.613926] [<ffffffff813da9c9>] disable_slot+0x58/0x5c
[ 171.619233] [<ffffffff813d77dc>] power_write_file+0xd2/0x11c
[ 171.624971] [<ffffffff813d770a>] ? get_attention_status+0xae/0xae
[ 171.631144] [<ffffffff813d1a49>] pci_slot_attr_store+0x29/0x2b
[ 171.637064] [<ffffffff81194eec>] sysfs_write_file+0x10e/0x14a
[ 171.642890] [<ffffffff8113de25>] vfs_write+0xb5/0x128
[ 171.648024] [<ffffffff8113e081>] sys_write+0x4d/0x77
[ 171.653070] [<ffffffff81cf1652>] system_call_fastpath+0x16/0x1b
--
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