[EMAIL PROTECTED] wrote:
>>> Found it. Could you give this patch a try and report the result?
>>>
>>> http://permalink.gmane.org/gmane.linux.kernel/682362
>
> Applied and tested, no luck...
>
> I-pipe: Detected illicit call from domain 'RTAI'
> into a service reserved for domain 'Linux' and below.
> Pid: 0, comm: swapper Not tainted 2.6.26.2-FuCS #1
> [<c0156866>] ipipe_check_context+0xd6/0xf0
> e1000: rteth0: e1000_watchdog: NIC Link is Up 1000 Mbps Full Duplex
> [<c03e206e>] _spin_lock_irqsave+0x1e/0x80
> [<c024a7a6>] pci_bus_read_config_word+0x36/0x80
> [<c0254156>] __msi_set_enable+0x46/0x80
> [<c01176f3>] ? mcount+0x1f/0x23
> [<c0254498>] msi_set_mask_bits+0xd8/0xe0
> [<c01176f3>] ? mcount+0x1f/0x23
> [<c0254737>] unmask_msi_irq+0x17/0x30
> [<c01542da>] default_enable+0x1a/0x30
> [<f892f1ee>] rt_enable_irq+0xe/0x10 [rtai_hal]
> [<f8dabd99>] ? xnintr_irq_handler+0x149/0x1f0 [rtai_rtdm]
> [<f893164b>] rtai_hirq_dispatcher+0xfb/0x430 [rtai_hal]
> [<c01021c5>] default_idle+0x45/0x60
> [<c0102180>] default_idle+0x0/0x60
> [<c0103cc7>] common_interrupt+0x2f/0x54
> [<c0102180>] default_idle+0x0/0x60
> [<c01500d8>] cgroup_file_write+0x118/0x140
> [<c01021c5>] default_idle+0x45/0x60
> [<c0101b76>] cpu_idle+0x86/0x140
> [<c03dd7fd>] start_secondary+0x16d/0x210
> [<c03d3a88>] initialize_secondary+0x8/0x20
> =======================
> I-pipe tracer log (100 points):
> | +*func 0 ipipe_trace_panic_freeze+0x9
I see no option aside of ironing the inner code that reads/writes the PCI
config, so here is an ugly yet possible solution for x86, that might work
(totally untested):
diff --git a/arch/x86/pci/common.c b/arch/x86/pci/common.c
index 6e64aaf..7f32101 100644
--- a/arch/x86/pci/common.c
+++ b/arch/x86/pci/common.c
@@ -75,7 +75,7 @@ int pcibios_scanned;
* This interrupt-safe spinlock protects all accesses to PCI
* configuration space.
*/
-DEFINE_SPINLOCK(pci_config_lock);
+IPIPE_DEFINE_SPINLOCK(pci_config_lock);
static int __devinit can_skip_ioresource_align(const struct dmi_system_id *d)
{
diff --git a/drivers/pci/access.c b/drivers/pci/access.c
index 39bb96b..9a74083 100644
--- a/drivers/pci/access.c
+++ b/drivers/pci/access.c
@@ -12,7 +12,7 @@
* configuration space.
*/
-static DEFINE_SPINLOCK(pci_lock);
+static IPIPE_DEFINE_SPINLOCK(pci_lock);
/*
* Wrappers for all PCI configuration access functions. They just check
> (ipipe_check_context+0x94)
> | +*func 0 find_next_bit+0xa (__next_cpu+0x1a)
> | +*func 0 __next_cpu+0x9 (ipipe_check_context+0x88)
> | +*func 0 find_next_bit+0xa (__next_cpu+0x1a)
> | +*func 0 __next_cpu+0x9 (ipipe_check_context+0x88)
> | +*func 0 find_next_bit+0xa (__next_cpu+0x1a)
> | +*func 0 __next_cpu+0x9 (ipipe_check_context+0x88)
> | +*func 0 find_next_bit+0xa (__next_cpu+0x1a)
> | +*func 0 __next_cpu+0x9 (ipipe_check_context+0x88)
> | +*func 0 find_first_bit+0xa (__first_cpu+0x12)
> | +*func -1 __first_cpu+0x8 (ipipe_check_context+0x66)
> | +*func -1 ipipe_check_context+0x14
> (_spin_lock_irqsave+0x1e)
> | +*func -1 _spin_lock_irqsave+0x12
> (pci_bus_read_config_word+0x36)
> | +*func -1 pci_bus_read_config_word+0x14
> (__msi_set_enable+0x46)
> | +*func -1 __msi_set_enable+0x14
> (msi_set_mask_bits+0xd8)
> | +*func -1 msi_set_mask_bits+0xe (unmask_msi_irq+0x17)
> | +*func -1 unmask_msi_irq+0x9 (default_enable+0x1a)
> | +*func -1 default_enable+0x9 (rt_enable_irq+0xe
> [rtai_hal])
> | +*func -2 alloc_rtskb+0x14 [rtnet]
> (e1000_alloc_rx_buffers+0x147 [rt_e1000])
> | +*func -2 e1000_alloc_rx_buffers+0xe [rt_e1000]
> (e1000_intr+0x37d [rt_e1000])
> | +*func -4 e1000_intr+0x11 [rt_e1000]
> (xnintr_irq_handler+0x9e [rtai_rtdm])
> | +*func -5 xnintr_irq_handler+0xe [rtai_rtdm]
> (rtai_hirq_dispatcher+0xfb [rtai_hal])
> | +*func -5 ack_ioapic_irq+0x8 (__ipipe_ack_edge_irq+0xe)
> | +*func -5 __ipipe_ack_edge_irq+0x8
> (__ipipe_ack_irq+0x19)
> | +*func -5 __ipipe_ack_irq+0x8
> (rtai_hirq_dispatcher+0x66 [rtai_hal])
> | +begin 0xffffff23 -5 common_interrupt+0x29 (default_idle+0x45)
> +end 0x8000000e -580 default_idle+0x43 (cpu_idle+0x86)
> +func -580 default_idle+0x8 (cpu_idle+0x86)
> | +end 0x80000001 -581 ipipe_suspend_domain+0xd7 (cpu_idle+0x84)
> | #begin 0x80000001 -581 ipipe_suspend_domain+0xee (cpu_idle+0x84)
> #func -581 ipipe_suspend_domain+0xe (cpu_idle+0x84)
> +func -581 ipipe_check_context+0x14 (cpu_idle+0x5b)
> +func -581 ipipe_check_context+0x14
> (_spin_unlock_irqrestore+0x23)
> | +end 0x80000000 -581 __ipipe_unstall_root+0x4a
> (__ipipe_restore_root+0x27)
> | #begin 0x80000000 -581 __ipipe_unstall_root+0x5b
> (__ipipe_restore_root+0x27)
> #func -581 __ipipe_unstall_root+0x8
> (__ipipe_restore_root+0x27)
> #func -581 __ipipe_restore_root+0x8
> (_spin_unlock_irqrestore+0x3d)
> #func -581 _spin_unlock_irqrestore+0x8
> (rcu_check_callbacks+0x5c)
> #func -582 __rcu_advance_callbacks+0x8
> (rcu_check_callbacks+0x35)
> #func -582 ipipe_check_context+0x14
> (_spin_lock_irqsave+0x49)
> +func -582 ipipe_check_context+0x14
> (_spin_lock_irqsave+0x1e)
> +func -582 _spin_lock_irqsave+0x12
> (rcu_check_callbacks+0x2c)
> +func -582 rcu_check_mb+0x8 (rcu_check_callbacks+0x1b)
> +func -582 rcu_check_callbacks+0xa (cpu_idle+0xb2)
> +func -582 rcu_pending+0x8 (cpu_idle+0xa5)
> | +end 0x8000000d -583 __ipipe_unstall_iret_root+0x36
> (restore_nocheck_notrace+0x0)
> | #func -583 __ipipe_unstall_iret_root+0x9
> (restore_nocheck_notrace+0x0)
> | #end 0xffffff15 -583 ipipe_ipiX+0x3e (default_idle+0x45)
> | +end 0x8000000d -583 __ipipe_unstall_iret_root+0x36
> (restore_nocheck_notrace+0x0)
> | #func -583 __ipipe_unstall_iret_root+0x9
> (restore_nocheck_notrace+0x0)
> #func -585 __ipipe_do_critical_sync+0x9
> (__ipipe_sync_stage+0x27b)
> | #end 0x80000000 -586 __ipipe_sync_stage+0x21f
> (rtai_hirq_dispatcher+0x3a1 [rtai_hal])
> | +func -586 __ipipe_sync_stage+0xe
> (rtai_hirq_dispatcher+0x3a1 [rtai_hal])
> | #func -586 __ipipe_ack_apic+0x8
> (rtai_hirq_dispatcher+0x257 [rtai_hal])
> | +begin 0xffffff15 -587 ipipe_ipiX+0x2e (default_idle+0x45)
> +end 0x8000000e -318728 default_idle+0x43 (cpu_idle+0x86)
> +func -318728 default_idle+0x8 (cpu_idle+0x86)
> | +end 0x80000001 -318728 ipipe_suspend_domain+0xd7 (cpu_idle+0x84)
> | #begin 0x80000001 -318728 ipipe_suspend_domain+0xee (cpu_idle+0x84)
> #func -318728 ipipe_suspend_domain+0xe (cpu_idle+0x84)
> +func -318729 ipipe_check_context+0x14 (cpu_idle+0x5b)
> +func -318729 rcu_pending+0x8 (cpu_idle+0xa5)
> | +end 0x80000000 -318729 __ipipe_unstall_root+0x4a
> (__ipipe_restore_root+0x27)
> | #begin 0x80000000 -318729 __ipipe_unstall_root+0x5b
> (__ipipe_restore_root+0x27)
> #func -318729 __ipipe_unstall_root+0x8
> (__ipipe_restore_root+0x27)
> #func -318729 __ipipe_restore_root+0x8
> (tick_nohz_stop_sched_tick+0x23b)
> #func -318729 ipipe_check_context+0x14
> (hrtimer_start+0xe1)
> #func -318729 ipipe_check_context+0x14
> (_spin_unlock_irqrestore+0x23)
> #func -318729 __ipipe_restore_root+0x8
> (_spin_unlock_irqrestore+0x19)
> #func -318729 _spin_unlock_irqrestore+0x8
> (hrtimer_start+0xd2)
> #func -318729 ipipe_check_context+0x14
> (hrtimer_start+0xba)
> #func -318730 rb_insert_color+0xe (enqueue_hrtimer+0x7d)
> #func -318730 lapic_next_event+0x8
> (clockevents_program_event+0x9e)
> #func -318730 clockevents_program_event+0x14
> (tick_program_event+0x44)
> #func -318730 set_normalized_timespec+0x8
> (ktime_get_ts+0x43)
> #func -318730 native_read_tsc+0x8 (read_tsc+0xe)
> #func -318730 read_tsc+0x9 (getnstimeofday+0x48)
> #func -318730 getnstimeofday+0xe (ktime_get_ts+0x22)
> #func -318730 ktime_get_ts+0xa (ktime_get+0x1e)
> #func -318730 ktime_get+0x14 (tick_program_event+0x29)
> #func -318730 tick_program_event+0xe
> (hrtimer_reprogram+0x86)
> #func -318731 hrtimer_reprogram+0x14
> (enqueue_hrtimer+0xaa)
> #func -318731 enqueue_hrtimer+0xe (hrtimer_start+0xad)
> #func -318731 rb_erase+0xe (__remove_hrtimer+0x57)
> #func -318731 hrtimer_force_reprogram+0xa
> (__remove_hrtimer+0x83)
> #func -318731 rb_next+0x9 (__remove_hrtimer+0x5e)
> #func -318731 __remove_hrtimer+0x16 (hrtimer_start+0x123)
> #func -318731 ipipe_check_context+0x14
> (_spin_lock_irqsave+0x49)
> #func -318731 ipipe_check_context+0x14
> (_spin_lock_irqsave+0x1e)
> #func -318731 _spin_lock_irqsave+0x12
> (lock_hrtimer_base+0x28)
> #func -318731 lock_hrtimer_base+0x16 (hrtimer_start+0x1e)
> #func -318732 hrtimer_start+0xe
> (tick_nohz_stop_sched_tick+0x255)
> #func -318732 hweight32+0x8
> (select_nohz_load_balancer+0x58)
> #func -318732 hweight32+0x8
> (select_nohz_load_balancer+0x4a)
> #func -318732 select_nohz_load_balancer+0xa
> (tick_nohz_stop_sched_tick+0x287)
> #func -318732 rcu_needs_cpu+0x8
> (tick_nohz_stop_sched_tick+0x13c)
> #func -318732 ipipe_check_context+0x14
> (_spin_unlock_irqrestore+0x23)
> #func -318732 __ipipe_restore_root+0x8
> (_spin_unlock_irqrestore+0x19)
> #func -318732 _spin_unlock_irqrestore+0x8
> (hrtimer_get_next_event+0xdb)
> #func -318732 ipipe_check_context+0x14
> (_spin_lock_irqsave+0x49)
>
>
>>> If it's ok, I guess we should include it in ipipe until someone (From
>>> -rt) manages to get it accepted upstream (I didn't recall much activity
>>> in this direction yet, though).
>> Not true, the patch is in 2.6.27-rcX.
>>
>> But there is also
>> http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=ce6fce4295ba727b36fdc73040e444bd1aae64cd
>> which makes me wonder, for 2.6.27, if that may generate cases where
>> masking MSI interrupts will not work as expected for ipipe (Linux should
>> catch masked IRQs internally). However, future problems...
>
> Bernhard
>
>
> _______________________________________________
> Adeos-main mailing list
> [EMAIL PROTECTED]
> https://mail.gna.org/listinfo/adeos-main
>
--
Philippe.
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