PCI HotPlug and Adding Resources after Linux Boots

[Morrison, Tom]

I am not exactly sure who to direct this question to (general Linux kernel or LinuxPPC),
so I am directing to both - in hopes that someone will recognize this problem - and perhaps
give me some suggestions on how to proceed...

I am running Linux (2.6.23x (and 2.6.27.x)) on a MPC8572 based system.

I have an 8616 switch that has a Port (6) connected to a FPGA that is
NOT loaded at before Linux boots (note: this port is configured for HOTPLUG
events - which we do get after FPGA  is loaded). We are NOT using a
static device tree map (because the devices in the system are very dynamic).

We use instead the pci auto scan mechanism(s) to scan/assign resources
(including into the BAR registers) at bootup to all of the devices that are
attached to this MPC8572...

Here is the port that is attached to the device (note: there are NO
resources assigned at this point this port):

-------------------------------------------------------------------------------------------------
02:06.0 PCI bridge: PLX Technology, Inc.: Unknown device 8616 (rev bb) (prog-if 00 [Normal decode])
        Flags: bus master, fast devsel, latency 0
        Bus: primary=02, secondary=05, subordinate=05, sec-latency=0
        Capabilities: [40] Power Management version 3
        Capabilities: [48] Message Signalled Interrupts: 64bit+ Queue=0/2 Enable+
        Capabilities: [68] #10 [0162]
        Capabilities: [a4] #0d [0000]

root at slave7 ~ # lspci -t
-+-[01]---00.0-[02-05]--+-01.0
 |                      +-04.0-[03]--
 |                      +-05.0-[04]--
 |                      \-06.0-[05]-

-------------------------------------------------------------------------------------------------

Later, after I detect there is an FPGA to load - I load it. At completion of the
loading of the FPGA - the 8616  detects the FPGA - and creates a HotPlug
event that the PCI Express HotPlug Driver handles:
-------------------------------------------------------------------------------------------------

root at slave7 ~ # pciehp: pcie_isr: intr_loc 8
pciehp: pciehp:  Presence/Notify input change.
pciehp: Card present on Slot(0005_0070)
pciehp: Surprise Removal
pciehp: hpc_get_power_status: SLOTCTRL 80 value read 8
pciehp: hpc_get_attention_status: SLOTCTRL 80, value read 8
pciehp: board_added: slot device, slot offset, hp slot = 0, 0 ,0
pciehp: hpc_check_lnk_status: lnk_status = 2021
PCI: Found 0000:05:00.0 [1172/0004] 00ff00 00
PCI: Calling quirk c0012d3c for 0000:05:00.0
program_fw_provided_values: Could not get hotplug parameters
entering assign resources (size: 2000000)
PCI: Failed to allocate mem resource #0:2000000 at 0 for 0000:05:00.0
bus pci: add device 0000:05:00.0
entering uevent
pci: Trying to Match Device 0000:05:00.0 with Driver pcieport-driver
pci: Trying to Match Device 0000:05:00.0 with Driver serial
pci: Trying to Match Device 0000:05:00.0 with Driver pexntb
pciehp: hpc_get_power_status: SLOTCTRL 80 value read 8
pciehp: hpc_get_attention_status: SLOTCTRL 80, value read 8

02:06.0 PCI bridge: PLX Technology, Inc.: Unknown device 8616 (rev bb) (prog-if 00 [Normal decode])
        Flags: bus master, fast devsel, latency 0
        Bus: primary=02, secondary=05, subordinate=05, sec-latency=0
        Capabilities: [40] Power Management version 3
        Capabilities: [48] Message Signalled Interrupts: 64bit+ Queue=0/2 Enable+
        Capabilities: [68] #10 [0162]
        Capabilities: [a4] #0d [0000]

05:00.0 Class ff00: Altera Corporation: Unknown device 0004 (rev 01)
        Subsystem: Altera Corporation: Unknown device 0004
        Flags: fast devsel
        Capabilities: [50] Message Signalled Interrupts: 64bit+ Queue=0/5 Enable-
        Capabilities: [78] Power Management version 3
        Capabilities: [80] #10 [0001]

root at slave7 ~ # lspci -t
-+-[01]---00.0-[02-05]--+-01.0
 |                      +-04.0-[03]--
 |                      +-05.0-[04]--
 |                      \-06.0-[05]----00.0
 \-[00]---00.0

-------------------------------------------------------------------------------------------------

So, as you can see - the device has been read - and it requires 32M of resources, but
because its parent doesn't have any resources allocated - it seemingly can't allocate and
use any additional resources.

How do I 'customize' and/or add resources at this point for this device (using semi-standard mechanisms)?

Thanks in advance for any/all ideas...


I


Tom Morrison
Principal Software Engineer
EMPIRIX
20 Crosby Drive - Bedford, MA  01730
p: 781.266.3567 f: 781.266.3670
email: tmorrison at empirix.com<mailto:tmorrison at empirix.com>
www.empirix.com<http://www.empirix.com/>



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