Re: [tip:x86/apic] x86: MSI: check for BIOS assigned addresses

Daniel Yeisley
2009-03-09T15:04:05Z

On Sun, 2009-03-08 at 11:54 +0100, Ingo Molnar wrote:
> * Yinghai Lu <yinghai@kernel.org> wrote:
>
> > Ingo Molnar wrote:
> > > * Daniel Yeisley <dan.yeisley@unisys.com> wrote:
> > >
> > >> On Fri, 2009-03-06 at 19:45 +0100, Ingo Molnar wrote:
> > >>> * Daniel Yeisley <dan.yeisley@unisys.com> wrote:
> > >>>
> > >>>> Commit-ID: affd49d36e2e2df4cbb3e07a57db901c23823b6a
> > >>>> Gitweb: http://git.kernel.org/tip/affd49d36e2e2df4cbb3e07a57db901c23823b6a
> > >>>> Author: "Daniel Yeisley" <dan.yeisley@unisys.com>
> > >>>> AuthorDate: Fri, 6 Mar 2009 10:11:49 -0500
> > >>>> Commit: Ingo Molnar <mingo@elte.hu>
> > >>>> CommitDate: Fri, 6 Mar 2009 19:32:44 +0100
> > >>>>
> > >>>> x86: MSI: check for BIOS assigned addresses
> > >>>>
> > >>>> Impact: fix ACPI hotplug on certain systems
> > >>> Note, this commit means that i moved the commit over from
> > >>> tip:x86/urgent into tip:x86/apic - i.e. with a 2.6.30 merge
> > >>> date. When exactly was this regression introduced? I think this
> > >>> code never really accepted the MSI settings from the firmware,
> > >>> so changing that behavior might affect a lot of systems.
> > >>>
> > >>> So i'm uneasy about applying this fix this late in the .29
> > >>> cycle, but marked it for -stable backport so it could hit
> > >>> 2.6.29.1 if it stays problem-free.
> > >>>
> > >>> Ingo
> > >> I initially noticed the problem on a 2.6.18 kernel. ACPI
> > >> hotplugging didn't work unless I booted with pci=nomsi. I
> > >> don't have a problem with waiting until 2.6.30 to make sure it
> > >> is thoroughly tested.
> > >
> > > Okay - so it's an ancient bug. The current track should thus be
> > > fine.
> > >
> >
> > please drop this patch. it seems it break msi-x.
> > at least igbe with msi-x does not work anymore.
>
> Not just that, it also causes bootup crashes - attached below.
> I'v dropped the patch for now.
>
> Ingo
>
> [ 4.276015] calling pcie_portdrv_init+0x0/0x4c @ 1
> [ 4.280343] bus: 'pci_express': registered
> [ 4.284017] bus: 'pci': add driver pcieport-driver
> [ 4.288046] bus: 'pci': driver_probe_device: matched device 0000:00:0b.0 with driver pcieport-driver
> [ 4.292014] bus: 'pci': really_probe: probing driver pcieport-driver with device 0000:00:0b.0
> [ 4.296148] pcieport-driver 0000:00:0b.0: setting latency timer to 64
> [ 4.304157] alloc irq_desc for 16 on cpu 0 node 0
> [ 4.308008] alloc kstat_irqs on cpu 0 node 0
> [ 4.308124] ------------[ cut here ]------------
> [ 4.312008] kernel BUG at arch/x86/kernel/apic/io_apic.c:1362!
> [ 4.312008] invalid opcode: 0000 [#1] SMP
> [ 4.312008] last sysfs file:
> [ 4.312008] CPU 0
> [ 4.312008] Modules linked in:
> [ 4.312008] Pid: 7, comm: work_on_cpu/0 Not tainted 2.6.29-rc7-tip-02101-g8d7adfc-dirty #31737 SMP Sun Mar 8 11:50:18 CET 2009 System Product Name
> [ 4.312008] RIP: 0010:[<ffffffff80221e36>] [<ffffffff80221e36>] __clear_irq_vector+0x1d/0xd8
> [ 4.312008] RSP: 0018:ffff88003f121bf0 EFLAGS: 00010046
> [ 4.312008] RAX: 0000000000000246 RBX: ffff88003ea0b1a0 RCX: 0000000000000002
> [ 4.312008] RDX: 8c6318c6318c6300 RSI: ffff88003ea0b1a0 RDI: 0000000000000010
> [ 4.312008] RBP: ffff88003f121c10 R08: ffff88003f118998 R09: 0000000000000070
> [ 4.312008] R10: 0000000000000000 R11: ffffffff80222c03 R12: 0000000000000010
> [ 4.312008] R13: 0000000000000010 R14: ffff88003f2a31b0 R15: 0000000000000001
> [ 4.312008] FS: 0000000000000000(0000) GS:ffff8800035b0000(0000) knlGS:0000000000000000
> [ 4.312008] CS: 0010 DS: 0018 ES: 0018 CR0: 000000008005003b
> [ 4.312008] CR2: 0000000000000000 CR3: 0000000000201000 CR4: 00000000000006e0
> [ 4.312008] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> [ 4.312008] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
> [ 4.312008] Process work_on_cpu/0 (pid: 7, threadinfo ffff88003f120000, task ffff88003f118000)
> [ 4.312008] Stack:
> [ 4.312008] 0000000000000246 0000000000000010 ffff88003ea0b1a0 ffff88003f2a31b0
> [ 4.312008] ffff88003f121c40 ffffffff80222c11 ffff88003f121c50 ffff88003ea060a8
> [ 4.312008] ffff88003f2a38b0 ffff88003f2a38b0 ffff88003f121c50 ffffffff80222c36
> [ 4.312008] Call Trace:
> [ 4.312008] [<ffffffff80222c11>] destroy_irq+0x4f/0x66
> [ 4.312008] [<ffffffff80222c36>] arch_teardown_msi_irq+0xe/0x10
> [ 4.312008] [<ffffffff80471099>] arch_teardown_msi_irqs+0x2c/0xa3
> [ 4.312008] [<ffffffff80471188>] msi_free_irqs+0x5d/0xff
> [ 4.312008] [<ffffffff80471a8f>] msi_capability_init+0x134/0x16d
> [ 4.312008] [<ffffffff8047202e>] pci_enable_msi+0x7c/0x82
> [ 4.312008] [<ffffffff804707ff>] assign_interrupt_mode+0xda/0x10b
> [ 4.312008] [<ffffffff80470a0d>] pcie_port_device_register+0xb3/0x123
> [ 4.312008] [<ffffffff80260f9c>] ? do_work_for_cpu+0x0/0x20
> [ 4.312008] [<ffffffff807e10af>] pcie_portdrv_probe+0x8c/0xb4
> [ 4.312008] [<ffffffff8046baee>] local_pci_probe+0x17/0x1b
> [ 4.312008] [<ffffffff80260fb4>] do_work_for_cpu+0x18/0x20
> [ 4.312008] [<ffffffff80261492>] run_workqueue+0x10c/0x221
> [ 4.312008] [<ffffffff80261440>] ? run_workqueue+0xba/0x221
> [ 4.312008] [<ffffffff802611b5>] ? test_ti_thread_flag+0x9/0x11
> [ 4.312008] [<ffffffff80262282>] worker_thread+0xd6/0xe7
> [ 4.312008] [<ffffffff802658b8>] ? autoremove_wake_function+0x0/0x3d
> [ 4.312008] [<ffffffff802621ac>] ? worker_thread+0x0/0xe7
> [ 4.312008] [<ffffffff802656d3>] kthread+0x4e/0x7b
> [ 4.312008] [<ffffffff80c54140>] ? early_idt_handler+0x0/0x73
> [ 4.312008] [<ffffffff8020d1ca>] child_rip+0xa/0x20
> [ 4.312008] [<ffffffff8020cb90>] ? restore_args+0x0/0x30
> [ 4.312008] [<ffffffff80265685>] ? kthread+0x0/0x7b
> [ 4.312008] [<ffffffff8020d1c0>] ? child_rip+0x0/0x20
> [ 4.312008] Code: ff 8b 35 2e 78 a1 00 e8 cd ff ff ff c9 c3 55 48 89 e5 41 56 41 55 41 54 53 e8 97 9f fe ff 8a 56 1c 41 89 fd 48 89 f3 84 d2 75 04 <0f> 0b eb fe 0f b6 d2 4c 8b 35 d4 b1 5f 00 48 c7 c0 20 b0 00 00
> [ 4.312008] RIP [<ffffffff80221e36>] __clear_irq_vector+0x1d/0xd8
> [ 4.312008] RSP <ffff88003f121bf0>

Can someone try the patch below? It only checks for MSI capability so
it shouldn't affect MSI-x.

Signed-off-by: Dan Yeisley <dan.yeisley@unisys.com>

---
diff -Naur linux-2.6.29-rc5/arch/x86/kernel/io_apic.c linux-2.6.29-rc5-dpy/arch/x86/kernel/io_apic.c
--- linux-2.6.29-rc5/arch/x86/kernel/io_apic.c 2009-02-13 18:31:30.000000000 -0500
+++ linux-2.6.29-rc5-dpy/arch/x86/kernel/io_apic.c 2009-03-09 04:36:35.000000000 -0400
@@ -3258,6 +3258,7 @@
struct irq_cfg *cfg;
int err;
unsigned dest;
+ int pos;

cfg = irq_cfg(irq);
err = assign_irq_vector(irq, cfg, TARGET_CPUS);
@@ -3266,6 +3267,14 @@

dest = cpu_mask_to_apicid_and(cfg->domain, TARGET_CPUS);

+ pos = pci_find_capability(pdev, PCI_CAP_ID_MSI);
+ if (pos != 0) {
+ pci_read_config_dword(pdev, pos + PCI_MSI_ADDRESS_LO,
+ &msg->address_lo);
+ pci_read_config_dword(pdev, pos + PCI_MSI_ADDRESS_HI,
+ &msg->address_hi);
+ }
+
#ifdef CONFIG_INTR_REMAP
if (irq_remapped(irq)) {
struct irte irte;
@@ -3295,17 +3304,18 @@
} else
#endif
{
- msg->address_hi = MSI_ADDR_BASE_HI;
- msg->address_lo =
- MSI_ADDR_BASE_LO |
- ((INT_DEST_MODE == 0) ?
- MSI_ADDR_DEST_MODE_PHYSICAL:
- MSI_ADDR_DEST_MODE_LOGICAL) |
- ((INT_DELIVERY_MODE != dest_LowestPrio) ?
- MSI_ADDR_REDIRECTION_CPU:
- MSI_ADDR_REDIRECTION_LOWPRI) |
- MSI_ADDR_DEST_ID(dest);
-
+ if (!msg->address_hi && !msg->address_lo) {
+ msg->address_hi = MSI_ADDR_BASE_HI;
+ msg->address_lo =
+ MSI_ADDR_BASE_LO |
+ ((INT_DEST_MODE == 0) ?
+ MSI_ADDR_DEST_MODE_PHYSICAL:
+ MSI_ADDR_DEST_MODE_LOGICAL) |
+ ((INT_DELIVERY_MODE != dest_LowestPrio) ?
+ MSI_ADDR_REDIRECTION_CPU:
+ MSI_ADDR_REDIRECTION_LOWPRI) |
+ MSI_ADDR_DEST_ID(dest);
+ }
msg->data =
MSI_DATA_TRIGGER_EDGE |
MSI_DATA_LEVEL_ASSERT |