linux-kernel - RE: Q: state of pci express hotplug

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Date:	Fri, 6 Feb 2009 15:37:01 -0500
From:	Krishna Kothapalli <krishna_sunitha@...mail.com>
To:	<kaneshige.kenji@...fujitsu.com>
CC:	<ebiederm@...ssion.com>, <linux-pci@...r.kernel.org>,
	<jbarnes@...tuousgeek.org>, <achiang@...com>, <djwong@...ibm.com>,
	<xyzzy@...akeasy.org>, <linux-kernel@...r.kernel.org>
Subject: RE: Q: state of pci express hotplug

> Kenji Kaneshige
> Thank you for the information. From the information, I understood
> both acpiphp and pciehp handles the same slot, and failed powering
> on the slot because those drivers detected adapter card didn't
> present or MRL opened. But I still don't know why. Could you send
> the following addtional information?

Apologize for the delay. I tried hotplug of PCI express card on a vendor box (running 2.6.18.x) with PCI express slot.
It looked a lot better. Here is dmesg output as soon a I hotplug and the device shows up in lspci  !!!

So I guess my mother board PCIe slot or BIOS is bad and looking for a looking for a low cost motherboard with working hotplug PCIe slot :)

pciehp: pcie_isr: intr_loc 8
pciehp: pcie_isr: hp_register_read_word SLOT_CTRL with value 28
pciehp: pcie_isr: hp_register_read_word SLOT_STATUS with value 48
pciehp: pciehp:  Presence/Notify input change.
pciehp: Card present on Slot(0003_0003)
pciehp: pcie_isr: Unmask Hot-plug Interrupt Enable
pciehp: event_thread woken finished = 0
pciehp: Surprise Removal
pciehp: hpc_get_power_status: SLOT_CTRL 58 value read 8
pciehp: hpc_get_attention_status: SLOT_CTRL 58, value read 8
pciehp: !!!!event_thread sleeping
pciehp: event_thread woken finished = 0
pciehp: pciehp_surprise_rm_thread: adding bus:device(3:0)
pciehp: board_added: slot device, slot offset, hp slot = 0, 0 ,0
pciehp: pcie_isr: hp_register_write_word SLOT_STATUS with value 1f
pciehp: hpc_check_lnk_status: lnk_status = 3011
ACPI: PCI Interrupt 0000:03:00.0[A] -> GSI 17 (level, low) -> IRQ 177
PCI: Setting latency timer of device 0000:03:00.0 to 64
ACPI: PCI interrupt for device 0000:03:00.0 disabled
pciehp: hpc_get_power_status: SLOT_CTRL 58 value read 28
pciehp: hpc_get_attention_status: SLOT_CTRL 58, value read 28
pciehp: !!!!event_thread sleeping

Thanks much for your all help. 

Thanks,
Krishna

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