Dear all, I have a 1 to 4 PCIe switch connected to a root port of a P2020. I am attaching a PCIe board to each one of the download ports of the switch (same kind of card with four serial ports in each one of them). When booting Linux, all cards are detected, so I can see them in /sys/bus/pci/devices. All 16 ttyS* are created. However, when trying to use them, I have no problems when using the serial ports of the card in the last downstream port of the switch, but if I try to use any of the others I obtain the following error: irq 16: nobody cared (try booting with the "irqpoll" option) Call Trace: [df83fca0] [c0007540] show_stack+0x84/0x1b0 (unreliable) [df83fcd8] [c0077324] __report_bad_irq+0x5c/0xe0 [df83fcf0] [c0077534] note_interrupt+0x18c/0x238 [df83fd10] [c0078520] handle_fasteoi_irq+0xe4/0x134 [df83fd28] [c0004ea0] handle_one_irq+0x30/0x44 [df83fd38] [c000c078] __ipipe_do_IRQ+0x84/0xc0 [df83fd58] [c007bdc8] __ipipe_sync_stage+0x210/0x3b8 [df83fdb0] [c007cf40] __ipipe_unstall_root+0x60/0x74 [df83fdb8] [c0047798] __do_softirq+0xd8/0x200 [df83fe08] [c0004d50] do_softirq+0x60/0x80 [df83fe18] [c004751c] irq_exit+0x54/0xac [df83fe20] [c000c07c] __ipipe_do_IRQ+0x88/0xc0 [df83fe40] [c007bdc8] __ipipe_sync_stage+0x210/0x3b8 [df83fe98] [c000ba7c] __ipipe_handle_irq+0x1c4/0x1f8 [df83fec8] [c000bd80] __ipipe_grab_irq+0x15c/0x1f0 [df83fee8] [c001323c] __ipipe_ret_from_except+0x0/0xc [df83ffa8] [c0008684] cpu_idle+0x68/0xe0 [df83ffc0] [c0544c2c] start_secondary+0x314/0x350 [df83fff0] [c0001c9c] __secondary_start+0x30/0x84 handlers: [<c0336e80>] (serial8250_interrupt+0x0/0x148) Disabling IRQ #16 What I can see from /sys/bus/pci/devices/*/irq is that one irq is assigned to each card; 16 for the first, 17 for the second, 18 for the third and 19 for the last (and successfull) one. My question is... where are irqs mapped for the pci express cards? I have backtrace the code to pci_device_probe in pci-driver.c, but there it seems that the irqs are already assigned. I have searched the web, but have not found the clue that makes me understand the process. Any ideas? Thanks Miguel Ángel -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
