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Message-ID: <CAErSpo6YEp2v9xzVJHsu5WSJDqb+sWZUfS-e7UmGEXENRiWmnQ@mail.gmail.com> Date: Fri, 7 Oct 2011 09:37:36 -0600 From: Bjorn Helgaas <bhelgaas@...gle.com> To: Abdelghani Ouchabane <abdelghani@...no.com> Cc: linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org Subject: Re: PCIe can not rescan for new PCIe device ( FPGA board ) [added cc: linux-pci@...r.kernel.org] On Fri, Oct 7, 2011 at 1:16 AM, Abdelghani Ouchabane <abdelghani@...no.com> wrote: > Hallo, > > We are developing a FPGA board connected to a Fedora 15 PC host over PCIe. > Right now, in the implementation and debug phase, I often need to power off > and > power on the device or try different boards. This causes a problem with the > Fedora 15 running on the AMD PC. > > Typically the PC is booted when I need to insert the device under test. As > expected, the Linux doesn't find the device and the software app cannot talk > to it. > > * If I do "lspci -v" then it does not list our device. Do you have pciehp enabled and loaded? I would think a PCIe hot-add should automatically rescan the bus. Does dmesg say anything when you do the hot-add? > * Then I execute "echo 1 > /sys/bus/pci/rescan" > > * Now "lspci -v" lists our device. That means config space accesses to your device seem to work fine. > * But our software returns : 0xFFFFFFFF Your device is on bus 02. Did you confirm that there are host bridge and P2P bridge apertures containing the BARs, e.g,. the [mem 0x40241000-0x40241fff] region? The dmesg log should show all this information. Bjorn > ************************************************************************************************************************************************************ > [root@...alhost ~]# show_regs > resource file = /sys/bus/pci/devices/0000:02:00.0/resource > base address = 0x40241000 > 0x40241000 0x00000000 0xFFFFFFFF 0xFFFFFFFF > 0x40241008 0x00000008 0xFFFFFFFF 0xFFFFFFFF > 0x40241010 0x00000010 0xFFFFFFFF 0xFFFFFFFF > 0x40241018 0x00000018 0xFFFFFFFF 0xFFFFFFFF > 0x40241020 0x00000020 0xFFFFFFFF 0xFFFFFFFF > 0x40241028 0x00000028 0xFFFFFFFF 0xFFFFFFFF > 0x40241030 0x00000030 0xFFFFFFFF 0xFFFFFFFF > 0x40241038 0x00000038 0xFFFFFFFF 0xFFFFFFFF > 0x40241040 0x00000040 0xFFFFFFFF 0xFFFFFFFF > 0x40241048 0x00000048 0xFFFFFFFF 0xFFFFFFFF > 0x40241050 0x00000050 0xFFFFFFFF 0xFFFFFFFF > 0x40241058 0x00000058 0xFFFFFFFF 0xFFFFFFFF > > > ************************************************************************************************************************************************************ > lspci -vvv > > 02:00.0 Signal processing controller: eZono AG eZono Malta - 32 channels > ultrasound front end (rev 01) > Subsystem: eZono AG Device 0001 > 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- > Interrupt: pin A routed to IRQ 7 > Region 0: Memory at 40240000 (64-bit, prefetchable) [size=4K] > Region 2: Memory at 40200000 (64-bit, prefetchable) [size=256K] > Region 4: Memory at 40241000 (64-bit, prefetchable) [size=4K] > Capabilities: [50] MSI: Enable- Count=1/1 Maskable- 64bit+ > Address: 0000000000000000 Data: 0000 > 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 (v1) Endpoint, MSI 00 > DevCap: MaxPayload 2048 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 x1, ASPM L0s, Latency > L0 <1us, L1 <1us > ClockPM- Surprise- LLActRep- BwNot- > LnkCtl: ASPM L0s Enabled; RCB 64 bytes Disabled- Retrain- > CommClk- > ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt- > LnkSta: Speed 2.5GT/s, Width x1, TrErr- Train- SlotClk- > DLActive- BWMgmt- ABWMgmt- > > > ************************************************************************************************************************************************************ > lspci -xxx > > 02:00.0 Signal processing controller: eZono AG eZono Malta - 32 channels > ultrasound front end (rev 01) > 00: 34 12 02 00 02 00 10 00 01 00 80 11 00 00 00 00 > 10: 0c 00 24 40 00 00 00 00 0c 00 20 40 00 00 00 00 > 20: 0c 10 24 40 00 00 00 00 00 00 00 00 34 12 01 00 > 30: 00 00 00 00 50 00 00 00 00 00 00 00 00 01 00 00 > 40: 00 00 00 00 70 61 62 01 00 00 00 00 00 00 00 00 > 50: 05 78 80 00 00 00 00 00 00 00 00 00 00 00 00 00 > 60: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 > 70: 00 00 00 00 00 00 00 00 01 80 03 00 00 00 00 00 > 80: 10 00 01 00 04 80 2c 01 10 28 00 00 11 44 00 01 > 90: 01 00 11 00 00 00 00 00 00 00 00 00 00 00 00 00 > a0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 > b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 > c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 > d0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 > e0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 > f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 > > ************************************************************************************************************************************************************ > > It looks that 'rescan' is not enough to handle cases like this? Or, is there > a > way to "insert" the FPGAs later after the kernel boots up? > > > Many thanks in advance, Ghani > > > -- > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo@...r.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/ > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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