(TX2)R28.2.1: request_irq for MSI-X failed

Hello,

My TX2i is running Kernel 4.4.38

The TX2i is connected to an Altera FPGA via PCIe

The output of lspci for this device is:

01:00.0 Unassigned class [ff00]: Altera Corporation Device 0000

	Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-

	Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- SERR- 
	Latency: 0

	Interrupt: pin A routed to IRQ 388

	Region 0: Memory at 58000000 (64-bit, prefetchable) [size=8M]

	Capabilities: [50] MSI: Enable- Count=1/16 Maskable- 64bit+

		Address: 0000000000000000  Data: 0000

	Capabilities: [68] **MSI-X: Enable- Count=8 Masked-**

		Vector table: BAR=0 offset=00080000

		PBA: BAR=0 offset=00090000

	Capabilities: [78] Power Management version 3

		Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)

		Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-

	Capabilities: [80] Express (v2) Endpoint, MSI 00

		DevCap:	MaxPayload 256 bytes, PhantFunc 0, Latency L0s <64ns, L1 <1us

			ExtTag- AttnBtn- AttnInd- PwrInd- RBE+ FLReset-

		DevCtl:	Report errors: Correctable- Non-Fatal- Fatal- Unsupported-

			RlxdOrd+ ExtTag- PhantFunc- AuxPwr- NoSnoop+

			MaxPayload 128 bytes, MaxReadReq 512 bytes

		DevSta:	CorrErr- UncorrErr- FatalErr- UnsuppReq- AuxPwr- TransPend-

		LnkCap:	Port #1, Speed 2.5GT/s, Width x4, ASPM L0s, Exit Latency L0s <4us, L1 <1us

			ClockPM- Surprise- LLActRep- BwNot- ASPMOptComp+

		LnkCtl:	ASPM Disabled; RCB 64 bytes Disabled- CommClk-

			ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-

		LnkSta:	Speed 2.5GT/s, Width x4, TrErr- Train- SlotClk+ DLActive- BWMgmt- ABWMgmt-

		DevCap2: Completion Timeout: Range ABCD, TimeoutDis+, LTR-, OBFF Not Supported

		DevCtl2: Completion Timeout: 50us to 50ms, TimeoutDis-, LTR-, OBFF Disabled

		LnkCtl2: Target Link Speed: 2.5GT/s, EnterCompliance- SpeedDis-

			 Transmit Margin: Normal Operating Range, EnterModifiedCompliance- ComplianceSOS-

			 Compliance De-emphasis: -6dB

		LnkSta2: Current De-emphasis Level: -3.5dB, EqualizationComplete-, EqualizationPhase1-

			 EqualizationPhase2-, EqualizationPhase3-, LinkEqualizationRequest-

	Capabilities: [100 v1] Virtual Channel

		Caps:	LPEVC=0 RefClk=100ns PATEntryBits=1

		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-

	Capabilities: [200 v1] Vendor Specific Information: ID=1172 Rev=0 Len=044 

	Kernel driver in use: rcmcr

The kernel code I’m running is:

MsiCount = pci_msi_vec_count (pPciDev);

vecs = pci_alloc_irq_vectors(pPciDev, 1, 8, PCI_IRQ_ALL_TYPES);

irq0 = pci_irq_vector(pPciDev, 0);

err = request_irq(irq0, IrqHandler, IRQF_SHARED,“isr”, pPciDev);

request_irq failed.

Same kernel code is running under linux4.9.20 with Intel module on the same FPGA.

Is it possible that this TX2 kernel version does not support MSI-X ?

Thank you,

Zvika