Hello,
I have a broken PCI bridge (PCIe downstream port), that is not raising interrupts at certain conditions.
I'm trying to fool the driver into believing that the device is actually sending interrupts by having a quirk that:
1) Polls the device register to monitor the interrupt condition.
2) When a condition is determined that needs an interrupt - calls the driver's ISR method.
My question - Instead of directly calling the ISR, is there a way my quirk can fake an interrupt being generated, through the PCI subsystem? That way, my quirk does not have to be a part of the (generic) PCI driver.
PCI bridge: Integrated Device Technology, Inc. PES12NT3 PCI Express Switch (rev 01) (prog-if 00 [Normal decode])
Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
Latency: 0
Bus: primary=11, secondary=13, subordinate=13, sec-latency=0
I/O behind bridge: 0000f000-00000fff
Memory behind bridge: 80000000-80ffffff
Prefetchable memory behind bridge: 00000000fff00000-00000000000fffff
Secondary status: 66MHz- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- <SERR- <PERR-
BridgeCtl: Parity- SERR- NoISA- VGA- MAbort- >Reset- FastB2B-
PriDiscTmr- SecDiscTmr- DiscTmrStat- DiscTmrSERREn-
Capabilities: [40] Express (v1) Downstream Port (Slot-), MSI 00
DevCap: MaxPayload 2048 bytes, PhantFunc 0, Latency L0s <64ns, L1 <1us
ExtTag+ RBE- FLReset-
DevCtl: Report errors: Correctable- Non-Fatal- Fatal- Unsupported-
RlxdOrd- ExtTag- PhantFunc- AuxPwr- NoSnoop-
MaxPayload 128 bytes, MaxReadReq 128 bytes
DevSta: CorrErr- UncorrErr+ FatalErr- UnsuppReq+ AuxPwr- TransPend-
LnkCap: Port #1, Speed 2.5GT/s, Width x4, ASPM L0s L1, Latency L0 <2us, L1 <4us
ClockPM- Surprise- LLActRep- BwNot-
LnkCtl: ASPM Disabled; Disabled- Retrain- CommClk-
ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
LnkSta: Speed 2.5GT/s, Width x0, TrErr- Train- SlotClk- DLActive- BWMgmt- ABWMgmt-
Capabilities: [70] Power Management version 2
Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA PME(D0+,D1-,D2-,D3hot+,D3cold+)
Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
Capabilities: [100 v1] Virtual Channel
Caps: LPEVC=0 RefClk=100ns PATEntryBits=2
Arb: Fixed- WRR32- WRR64- WRR128-
Ctrl: ArbSelect=Fixed
Status: InProgress-
VC0: Caps: PATOffset=00 MaxTimeSlots=1 RejSnoopTrans-
Arb: Fixed+ WRR32- WRR64- WRR128- TWRR128- WRR256-
Ctrl: Enable+ ID=0 ArbSelect=Fixed TC/VC=ff
Status: NegoPending- InProgress-
Kernel driver in use: pcieport
Thanks,
Rajat
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