On 03/28/2012 05:53 PM, Makarand Pradhan wrote:
Hi All,
I am working with MPC8360, Linux 3.0.0, Xenomai 2.6.
I am experiencing delays as high as 250ms in processing interrupt 43
(2b). Interrupt 43 indicates that the power quicc engine has
transmitted/received a frame. This interrupt is being handled in Xenomai.
The ipipe trace indicates that ipipe has kept the interrupt masked which
may be the cause of the problem.
The problem is seen intermittently after upgrading to Xenomai 2.6. This
problem was never seen in Xenomai 2.4.10.
*
Normal operation:*
Under normal operation, the irq is unmasked roughly within 300usecs.
after it is masked on receipt of an int: e.g.
From attached file: *good_int2b_ipipe_frozen*
The log says your code wants to control when the IRQ is enabled again,
by calling rt_intr_enable() from userland. I guess you are setting
I_NOAUTOENA too. Correct?
Int masked for 647 - 370 = 277 usec
Int received:
:| +begin 0x0000002b *-647 * 0.590 __ipipe_qe_ic_cascade_irq+0x2c
(qe_ic_cascade_low_ipic+0x5c)
:| +func -646 0.575 __ipipe_handle_irq+0x8 (__ipipe_qe_ic_cascade_irq+0x38)
:| +func -646 0.787 __ipipe_ack_level_irq+0x8 (__ipipe_handle_irq+0xbc)
:| +func -645 0.666 qe_ic_mask_irq+0x8 (__ipipe_ack_level_irq+0x40)
Int unmasked:
:| +end 0x0000002b *-370*+ 1.151 __ipipe_qe_ic_cascade_irq+0x40
(qe_ic_cascade_low_ipic+0x5c)
:| +func -369 0.742 ipic_unmask_irq+0x8 (qe_ic_cascade_low_ipic+0x70)
*Problem scenario:*
The ipipe trace indicates that the irq stayed masked for a long time:
From: bad_int2b_ipipe_frozen
The int stayed masked for more than 50ms after which it was unmasked:
Int received: No begin 0x0000002b for more than 50ms. So the int has
occurred more than 50ms ago.
Int unmasked:
:| #end 0x0000002b -434+ 2.272 __ipipe_qe_ic_cascade_irq+0x40
(qe_ic_cascade_low_ipic+0x5c)
:| #func -432+ 1.212 ipic_unmask_irq+0x8 (qe_ic_cascade_low_ipic+0x70)
The ipipe traces are attached to this email for reference.
Can you please help me understand the cause for this behavior? Any
pointers would be appreciated.
The interrupt is being handled in user space thorugh rt_intr_wait. Do I
need to invoke a rt call to tell ipipe to unmask the intr?
Please feel free to correct me if the traces are being interpreted wrongly.
Warm Rgds,
Mak.
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