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SubjectRe: ATH9 driver issues on ARM64
From
Date
Hello there,

as this is a thread about ath9k and ARM64, i'm not sure if i should
answer here or not, but i have similar "stalls" with ath9k on x86_64
(starting with 4.9rc), stack trace is posted down below where the
original ARM64 stall traces are.

Greetings,

Tobias


On 08.12.2016 18:36, Kalle Valo wrote:
> Bharat Kumar Gogada <bharat.kumar.gogada@xilinx.com> writes:
>
>> > [+cc Kalle, ath9k list]
> Thanks, but please also CC linux-wireless. Full thread below for the
> folks there.
>
>>> On Thu, Dec 08, 2016 at 01:49:42PM +0000, Bharat Kumar Gogada wrote:
>>>> Hi,
>>>>
>>>> Did anyone test Atheros ATH9 driver(drivers/net/wireless/ath/ath9k/)
>>>> on ARM64. The end point is TP link wifi card with which supports
>>>> only legacy interrupts.
>>> If it works on other arches and the arm64 PCI enumeration works, my
>>> first guess would be an INTx issue, e.g., maybe the driver is waiting
>>> for an interrupt that never arrives.
>> We are not sure for now.
>>>> We are trying to test it on ARM64 with
>>>> (drivers/pci/host/pcie-xilinx-nwl.c) as root port.
>>>>
>>>> EP is getting enumerated and able to link up.
>>>>
>>>> But when we start scan system gets hanged.
>>> When you say the system hangs when you start a scan, I assume you mean
>>> a wifi scan, not the PCI enumeration. A problem with a wifi scan
>>> might cause a *process* to hang, but it shouldn't hang the entire
>>> system.
>>>
>> Yes wifi scan.
>>>> When we took trace we see that after we start scan assert message is
>>>> sent but there is no de assert from end point.
>>> Are you talking about a trace from a PCIe analyzer? Do you see an
>>> Assert_INTx PCIe message on the link?
>>>
>> Yes lecroy trace, yes we do see Assert_INTx and Deassert_INTx happening when we do interface link up.
>> When we have less debug prints in Atheros driver, and do wifi scan we see Assert_INTx but never Deassert_INTx,
>>>> What might cause end point not sending de assert ?
>>> If the endpoint doesn't send a Deassert_INTx message, I expect that
>>> would mean the driver didn't service the interrupt and remove the
>>> condition that caused the device to assert the interrupt in the first
>>> place.
>>>
>>> If the driver didn't receive the interrupt, it couldn't service it, of
>>> course. You could add a printk in the ath9k interrupt service
>>> routine to see if you ever get there.
>>>
>> The interrupt behavior is changing w.r.t amount of debug prints we add. (I kept many prints to aid debug)
>> root@Xilinx-ZCU102-2016_3:~# iw dev wlan0 scan
>> [ 83.064675] ath9k: ath9k_iowrite32 ffffff800a400024
>> [ 83.069486] ath9k: ath9k_ioread32 ffffff800a400024
>> [ 83.074257] ath9k_hw_kill_interrupts 793
>> [ 83.078260] ath9k: ath9k_iowrite32 ffffff800a400024
>> [ 83.083107] ath9k: ath9k_ioread32 ffffff800a400024
>> [ 83.087882] ath9k_hw_kill_interrupts 793
>> [ 83.095450] ath9k_hw_enable_interrupts 821
>> [ 83.099557] ath9k_hw_enable_interrupts 825
>> [ 83.103721] ath9k_hw_enable_interrupts 832
>> [ 83.107887] ath9k: ath9k_iowrite32 ffffff800a400024
>> [ 83.112748] AR_SREV_9100 0
>> [ 83.115438] ath9k_hw_enable_interrupts 848
>> [ 83.119607] ath9k: ath9k_ioread32 ffffff800a400024
>> [ 83.124389] ath9k_hw_intrpend 762
>> [ 83.127761] (AR_SREV_9340(ah) val 0
>> [ 83.131234] ath9k_hw_intrpend 767
>> [ 83.134628] ath_isr 603
>> [ 83.137134] ath9k: ath9k_iowrite32 ffffff800a400024
>> [ 83.141995] ath9k: ath9k_ioread32 ffffff800a400024
>> [ 83.146771] ath9k_hw_kill_interrupts 793
>> [ 83.150864] ath9k_hw_enable_interrupts 821
>> [ 83.154971] ath9k_hw_enable_interrupts 825
>> [ 83.159135] ath9k_hw_enable_interrupts 832
>> [ 83.163300] ath9k: ath9k_iowrite32 ffffff800a400024
>> [ 83.168161] AR_SREV_9100 0
>> [ 83.170852] ath9k_hw_enable_interrupts 848
>> [ 83.170855] ath9k_hw_intrpend 762
>> [ 83.178398] (AR_SREV_9340(ah) val 0
>> [ 83.181873] ath9k_hw_intrpend 767
>> [ 83.185265] ath_isr 603
>> [ 83.187773] ath9k: ath9k_iowrite32 ffffff800a400024
>> [ 83.192635] ath9k: ath9k_ioread32 ffffff800a400024
>> [ 83.197411] ath9k_hw_kill_interrupts 793
>> [ 83.201414] ath9k: ath9k_ioread32 ffffff800a400024
>> [ 83.206258] ath9k_hw_enable_interrupts 821
>> [ 83.210368] ath9k_hw_enable_interrupts 825
>> [ 83.214531] ath9k_hw_enable_interrupts 832
>> [ 83.218698] ath9k: ath9k_iowrite32 ffffff800a400024
>> [ 83.223558] AR_SREV_9100 0
>> [ 83.226243] ath9k_hw_enable_interrupts 848
>> [ 83.226246] ath9k_hw_intrpend 762
>> [ 83.233794] (AR_SREV_9340(ah) val 0
>> [ 83.237268] ath9k_hw_intrpend 767
>> [ 83.240661] ath_isr 603
>> [ 83.243169] ath9k: ath9k_iowrite32 ffffff800a400024
>> [ 83.248030] ath9k: ath9k_ioread32 ffffff800a400024
>> [ 83.252806] ath9k_hw_kill_interrupts 793
>> [ 83.256811] ath9k: ath9k_ioread32 ffffff800a400024
>> [ 83.261651] ath9k_hw_enable_interrupts 821
>> [ 83.265753] ath9k_hw_enable_interrupts 825
>> [ 83.269919] ath9k_hw_enable_interrupts 832
>> [ 83.274083] ath9k: ath9k_iowrite32 ffffff800a400024
>> [ 83.278945] AR_SREV_9100 0
>> [ 83.281630] ath9k_hw_enable_interrupts 848
>> [ 83.281633] ath9k_hw_intrpend 762
>> [ 83.281634] (AR_SREV_9340(ah) val 0
>> [ 83.281637] ath9k_hw_intrpend 767
>> [ 83.281648] ath_isr 603
>> [ 83.281649] ath9k: ath9k_iowrite32 ffffff800a400024
>> [ 83.281651] ath9k: ath9k_ioread32 ffffff800a400024
>> [ 83.281654] ath9k_hw_kill_interrupts 793
>> [ 83.312192] ath9k: ath9k_ioread32 ffffff800a400024
>> [ 83.317030] ath9k_hw_enable_interrupts 821
>> [ 83.321132] ath9k_hw_enable_interrupts 825
>> [ 83.325297] ath9k_hw_enable_interrupts 832
>> [ 83.329463] ath9k: ath9k_iowrite32 ffffff800a400024
>> [ 83.334324] AR_SREV_9100 0
>> [ 83.337014] ath9k_hw_enable_interrupts 848
>> ..
>> ..
>> This log continues until I turn off board without obtaining scanning result.
>>
>> In between I get following cpu stall outputs :
>> 230.457179] INFO: rcu_sched self-detected stall on CPU
>> [ 230.457185] 2-...: (31314 ticks this GP) idle=2d1/140000000000001/0 softirq=1400/1400 fqs=36713
>> [ 230.457189] (t=36756 jiffies g=161 c=160 q=16169)
>> [ 230.457191] Task dump for CPU 2:
>> [ 230.457196] kworker/u8:4 R running task 0 1342 2 0x00000002
>> [ 230.457207] Workqueue: phy0 ieee80211_scan_work
>> [ 230.457208] Call trace:
>> [ 230.457214] [<ffffff8008089860>] dump_backtrace+0x0/0x198
>> [ 230.457219] [<ffffff8008089a0c>] show_stack+0x14/0x20
>> [ 230.457224] [<ffffff80080c0930>] sched_show_task+0x98/0xf8
>> [ 230.457228] [<ffffff80080c2628>] dump_cpu_task+0x40/0x50
>> [ 230.457233] [<ffffff80080e14a8>] rcu_dump_cpu_stacks+0xa0/0xf0
>> [ 230.457239] [<ffffff80080e4cd8>] rcu_check_callbacks+0x468/0x748
>> [ 230.457243] [<ffffff80080e7cfc>] update_process_times+0x3c/0x68
>> [ 230.457249] [<ffffff80080f6dfc>] tick_sched_handle.isra.5+0x3c/0x50
>> [ 230.457253] [<ffffff80080f6e54>] tick_sched_timer+0x44/0x90
>> [ 230.457257] [<ffffff80080e86b0>] __hrtimer_run_queues+0xf0/0x178
>> ** 10 printk messages dropped ** [ 230.457302] f8c0: 0000000000000000 0000000005f5e0ff 000000000001379a 3866666666666620
>> [ 230.457306] f8e0: ffffff800a1b4065 0000000000000006 ffffff800a129000 ffffffc87b8010a8
>> [ 230.457310] f900: ffffff808a1b4057 ffffff800a1c3000 ffffff800a1b3000 ffffff800a13b000
>> [ 230.457314] f920: 0000000000000140 0000000000000006 ffffff800a1b3b10 ffffff800a1c39e8
>> [ 230.457318] f940: 000000000000002f ffffff800a1b8a98 ffffff800a1b3ae8 ffffffc87b07f990
>> [ 230.457322] f960: ffffff80080d6230 ffffffc87b07f990 ffffff80080d6234 0000000060000145
>> ** 1 printk messages dropped ** [ 230.457329] [<ffffff8008085720>] el1_irq+0xa0/0x100
>> ** 9 printk messages dropped ** [ 230.457373] [<ffffff800885ad60>] ieee80211_hw_config+0x50/0x290
>> [ 230.457377] [<ffffff8008863690>] ieee80211_scan_work+0x1f8/0x480
>> [ 230.457383] [<ffffff80080b15d0>] process_one_work+0x120/0x378
>> [ 230.457386] [<ffffff80080b1870>] worker_thread+0x48/0x4b0
>> [ 230.457391] [<ffffff80080b7108>] kthread+0xd0/0xe8
>> [ 230.457395] [<ffffff8008085dd0>] ret_from_fork+0x10/0x40
>> [ 230.480389] ath9k_hw_intrpend 762
>>
>>
>> [ 545.487987] ath9k: ath9k_ioread32 ffffff800a400024
>> [ 545.526189] INFO: rcu_sched self-detected stall on CPU
>> [ 545.526195] 2-...: (97636 ticks this GP) idle=2d1/140000000000001/0 softirq=1400/1400 fqs=115374
>> [ 545.526199] (t=115523 jiffies g=161 c=160 q=51066)
>> [ 545.526201] Task dump for CPU 2:
>> [ 545.526206] kworker/u8:4 R running task 0 1342 2 0x00000002
>> ** 3 printk messages dropped ** [ 545.526231] [<ffffff8008089a0c>] show_stack+0x14/0x20
>> ** 9 printk messages dropped ** [ 545.526280] [<ffffff80086a71e8>] arch_timer_handler_phys+0x30/0x40
>> [ 545.526284] [<ffffff80080dbe18>] handle_percpu_devid_irq+0x78/0xa0
>> [ 545.526291] [<ffffff80080d760c>] generic_handle_irq+0x24/0x38
>> [ 545.526296] [<ffffff80080d7944>] __handle_domain_irq+0x5c/0xb8
>> [ 545.526299] [<ffffff80080824bc>] gic_handle_irq+0x64/0xc0
>> [ 545.526302] Exception stack(0xffffffc87b07f870 to 0xffffffc87b07f990)
>> [ 545.526306] f860: 0000000000009732 ffffff800a1eaaa8
>> ** 8 printk messages dropped ** [ 545.526341] f980: ffffff800a1c39e8 0000000000000036
>> [ 545.526345] [<ffffff8008085720>] el1_irq+0xa0/0x100
>> [ 545.526349] [<ffffff80080d6234>] console_unlock+0x384/0x5b0
>> [ 545.526353] [<ffffff80080d673c>] vprintk_emit+0x2dc/0x4b0
>> [ 545.526357] [<ffffff80080d6a50>] vprintk_default+0x38/0x40
>> [ 545.526362] [<ffffff8008129704>] printk+0x58/0x60
>> [ 545.526366] [<ffffff800859e3e4>] ath9k_iowrite32+0x9c/0xa8
>> [ 545.526372] [<ffffff80085c7ca8>] ath9k_hw_kill_interrupts+0x28/0xf0
>> [ 545.526376] [<ffffff80085a18ec>] ath_reset+0x24/0x68
>> ** 2 printk messages dropped ** [ 545.526391] [<ffffff800885ad60>] ieee80211_hw_config+0x50/0x290
>> ** 11 printk messages dropped ** [ 545.532834] ath9k_hw_kill_interrupts 793
>> [ 545.532890] ath9k_hw_enable_interrupts 821

[ 81.876902] INFO: rcu_preempt detected stalls on CPUs/tasks:
[ 81.876912] Tasks blocked on level-0 rcu_node (CPUs 0-7): P0
[ 81.876932] (detected by 4, t=60002 jiffies, g=1873, c=1872, q=4967)
[ 81.876936] swapper/4 R running task 0 0 1
0x00000000
[ 81.876941] 0000000000000001 ffffffff810725f6 ffff88017edbc240
ffffffff81a3dc40
[ 81.876945] ffffffff81101e46 ffff88025ef173c0 ffffffff81a3dc40
ffffffff81a3dc40
[ 81.876948] 00000000ffffffff ffffffff810a7333 ffff88017ecee698
ffff88017edbc240
[ 81.876951] Call Trace:
[ 81.876970] <IRQ>
[ 81.876979] [<ffffffff810725f6>] ? sched_show_task+0xd6/0x140
[ 81.876983] [<ffffffff81101e46>] ?
rcu_print_detail_task_stall_rnp+0x40/0x61
[ 81.876989] [<ffffffff810a7333>] ? rcu_check_callbacks+0x6b3/0x8c0
[ 81.876993] [<ffffffff810b8350>] ? tick_sched_handle.isra.14+0x40/0x40
[ 81.876996] [<ffffffff810aa4c3>] ? update_process_times+0x23/0x50
[ 81.876999] [<ffffffff810b8383>] ? tick_sched_timer+0x33/0x60
[ 81.877002] [<ffffffff810aaf09>] ? __hrtimer_run_queues+0xb9/0x150
[ 81.877004] [<ffffffff810ab198>] ? hrtimer_interrupt+0x98/0x1a0
[ 81.877008] [<ffffffff81031b1e>] ?
smp_trace_apic_timer_interrupt+0x5e/0x90
[ 81.877012] [<ffffffff815b31bf>] ? apic_timer_interrupt+0x7f/0x90
[ 81.877013] <EOI>
[ 81.877017] [<ffffffff8147f28d>] ? cpuidle_enter_state+0x13d/0x1f0
[ 81.877019] [<ffffffff8147f289>] ? cpuidle_enter_state+0x139/0x1f0
[ 81.877021] [<ffffffff81088c19>] ? cpu_startup_entry+0x139/0x210
[ 81.877027] [<ffffffff8102fc9e>] ? start_secondary+0x13e/0x170
[ 81.877029] swapper/4 R running task 0 0 1
0x00000000
[ 81.877032] 0000000000000001 ffffffff810725f6 ffff88017edbc240
ffffffff81a3dc40
[ 81.877035] ffffffff81101e46 ffff88025ef173c0 ffffffff81a3dc40
ffffffff81a3dc40
[ 81.877038] 00000000ffffffff ffffffff810a7368 ffff88017ecee698
ffff88017edbc240
[ 81.877041] Call Trace:
[ 81.877045] <IRQ>
[ 81.877049] [<ffffffff810725f6>] ? sched_show_task+0xd6/0x140
[ 81.877051] [<ffffffff81101e46>] ?
rcu_print_detail_task_stall_rnp+0x40/0x61
[ 81.877055] [<ffffffff810a7368>] ? rcu_check_callbacks+0x6e8/0x8c0
[ 81.877058] [<ffffffff810b8350>] ? tick_sched_handle.isra.14+0x40/0x40
[ 81.877060] [<ffffffff810aa4c3>] ? update_process_times+0x23/0x50
[ 81.877063] [<ffffffff810b8383>] ? tick_sched_timer+0x33/0x60
[ 81.877065] [<ffffffff810aaf09>] ? __hrtimer_run_queues+0xb9/0x150
[ 81.877068] [<ffffffff810ab198>] ? hrtimer_interrupt+0x98/0x1a0
[ 81.877070] [<ffffffff81031b1e>] ?
smp_trace_apic_timer_interrupt+0x5e/0x90
[ 81.877073] [<ffffffff815b31bf>] ? apic_timer_interrupt+0x7f/0x90
[ 81.877074] <EOI>
[ 81.877076] [<ffffffff8147f28d>] ? cpuidle_enter_state+0x13d/0x1f0
[ 81.877078] [<ffffffff8147f289>] ? cpuidle_enter_state+0x139/0x1f0
[ 81.877080] [<ffffffff81088c19>] ? cpu_startup_entry+0x139/0x210
[ 81.877084] [<ffffffff8102fc9e>] ? start_secondary+0x13e/0x170
[ 91.132787] INFO: rcu_preempt detected expedited stalls on
CPUs/tasks: { P0 } 63785 jiffies s: 505 root: 0x0/T
[ 91.132796] blocking rcu_node structures:

>>
>>
>> But if we have less debug prints it does not reach EP handler sometimes, due to following
>> Condition in "kernel/irq/chip.c" in function handle_simple_irq
>>
>> if (unlikely(!desc->action || irqd_irq_disabled(&desc->irq_data))) {
>> desc->istate |= IRQS_PENDING;
>> goto out_unlock;
>> }
>> Here irqd_irq_disabled is being set to 1.
>>
>> With lesser debug prints it stops after following prints:
>> root@Xilinx-ZCU102-2016_3:~# iw dev wlan0 scan
>> [ 54.781045] ath9k_hw_kill_interrupts 793
>> [ 54.785007] ath9k_hw_kill_interrupts 793
>> [ 54.792535] ath9k_hw_enable_interrupts 821
>> [ 54.796642] ath9k_hw_enable_interrupts 825
>> [ 54.800807] ath9k_hw_enable_interrupts 832
>> [ 54.804973] AR_SREV_9100 0
>> [ 54.807663] ath9k_hw_enable_interrupts 848
>> [ 54.811843] ath9k_hw_intrpend 762
>> [ 54.815211] (AR_SREV_9340(ah) val 0
>> [ 54.818684] ath9k_hw_intrpend 767
>> [ 54.822078] ath_isr 603
>> [ 54.824587] ath9k_hw_kill_interrupts 793
>> [ 54.828601] ath9k_hw_enable_interrupts 821
>> [ 54.832750] ath9k_hw_enable_interrupts 825
>> [ 54.836916] ath9k_hw_enable_interrupts 832
>> [ 54.841082] AR_SREV_9100 0
>> [ 54.843772] ath9k_hw_enable_interrupts 848
>> [ 54.843775] ath9k_hw_intrpend 762
>> [ 54.851319] (AR_SREV_9340(ah) val 0
>> [ 54.854793] ath9k_hw_intrpend 767
>> [ 54.858185] ath_isr 603
>> [ 54.860696] ath9k_hw_kill_interrupts 793
>> [ 54.864776] ath9k_hw_enable_interrupts 821
>> [ 54.867061] ath9k_hw_kill_interrupts 793
>> [ 54.872870] ath9k_hw_enable_interrupts 825
>> [ 54.877036] ath9k_hw_enable_interrupts 832
>> [ 54.881202] AR_SREV_9100 0
>> [ 54.883892] ath9k_hw_enable_interrupts 848
>> [ 75.963129] INFO: rcu_sched detected stalls on CPUs/tasks:
>> [ 75.968602] 0-...: (2 GPs behind) idle=9d5/140000000000001/0 softirq=1103/1109 fqs=519
>> [ 75.976675] (detected by 2, t=5274 jiffies, g=64, c=63, q=11)
>> [ 75.982485] Task dump for CPU 0:
>> [ 75.985696] ksoftirqd/0 R running task 0 3 2 0x00000002
>> [ 75.992726] Call trace:
>> [ 75.995165] [<ffffff8008086b3c>] __switch_to+0xc4/0xd0
>> [ 76.000281] [<ffffffc87b830500>] 0xffffffc87b830500
>> [ 139.059027] INFO: rcu_sched detected stalls on CPUs/tasks:
>> [ 139.064430] 0-...: (2 GPs behind) idle=9d5/140000000000001/0 softirq=1103/1109 fqs=2097
>> [ 139.072593] (detected by 2, t=21049 jiffies, g=64, c=63, q=11)
>> [ 139.078489] Task dump for CPU 0:
>> [ 139.081700] ksoftirqd/0 R running task 0 3 2 0x00000002
>> [ 139.088731] Call trace:
>> [ 139.091165] [<ffffff8008086b3c>] __switch_to+0xc4/0xd0
>> [ 139.096285] [<ffffffc87b830500>] 0xffffffc87b830500
>>
>>
>>>> We are not seeing any issues on 32-bit ARM platform and X86
>>>> platform.
>>> Can you collect a dmesg log (or, if the system hang means you can't
>>> collect that, a console log with "ignore_loglevel"), and "lspci -vv"
>>> output as root? That should have clues about whether the INTx got
>>> routed correctly. /proc/interrupts should also show whether we're
>>> receiving interrupts from the device.
>> Here is the lspci output:
>> 00:00.0 PCI bridge: Xilinx Corporation Device d022 (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
>> Interrupt: pin A routed to IRQ 224
>> Bus: primary=00, secondary=01, subordinate=0c, sec-latency=0
>> I/O behind bridge: 00000000-00000fff
>> Memory behind bridge: e0000000-e00fffff
>> 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] 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: [60] Express (v2) Root Port (Slot-), MSI 00
>> DevCap: MaxPayload 256 bytes, PhantFunc 0
>> ExtTag- RBE+
>> 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 #0, Speed 5GT/s, Width x2, ASPM not supported, Exit Latency L0s unlimited, L1 unlimited
>> ClockPM- Surprise- LLActRep- BwNot+ ASPMOptComp+
>> LnkCtl: ASPM Disabled; RCB 64 bytes Disabled- CommClk-
>> ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
>> LnkSta: Speed 2.5GT/s, Width x1, TrErr- Train- SlotClk+ DLActive- BWMgmt- ABWMgmt-
>> RootCtl: ErrCorrectable- ErrNon-Fatal- ErrFatal- PMEIntEna- CRSVisible+
>> RootCap: CRSVisible+
>> RootSta: PME ReqID 0000, PMEStatus- PMEPending-
>> DevCap2: Completion Timeout: Range B, TimeoutDis+, LTR-, OBFF Not Supported ARIFwd-
>> DevCtl2: Completion Timeout: 50us to 50ms, TimeoutDis-, LTR-, OBFF Disabled ARIFwd-
>> LnkCtl2: Target Link Speed: 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] Device Serial Number 00-00-00-00-00-00-00-00
>> Capabilities: [10c 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: [128 v1] Vendor Specific Information: ID=1234 Rev=1 Len=018 <?>
>>
>> 01:00.0 Network controller: Qualcomm Atheros AR93xx Wireless Network Adapter (rev 01)
>> Subsystem: Qualcomm Atheros Device 3112
>> 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, Cache Line Size: 128 bytes
>> Interrupt: pin A routed to IRQ 224
>> Region 0: Memory at e0000000 (64-bit, non-prefetchable) [size=128K]
>> [virtual] Expansion ROM at e0020000 [disabled] [size=64K]
>> Capabilities: [40] Power Management version 3
>> Flags: PMEClk- DSI- D1+ D2- AuxCurrent=375mA PME(D0+,D1+,D2-,D3hot+,D3cold-)
>> Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
>> Capabilities: [50] MSI: Enable- Count=1/4 Maskable+ 64bit+
>> Address: 0000000000000000 Data: 0000
>> Masking: 00000000 Pending: 00000000
>> Capabilities: [70] Express (v2) Endpoint, MSI 00
>> DevCap: MaxPayload 128 bytes, PhantFunc 0, Latency L0s <1us, L1 <8us
>> ExtTag- AttnBtn- AttnInd- PwrInd- RBE+ FLReset- SlotPowerLimit 0.000W
>> 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 #0, Speed 2.5GT/s, Width x1, ASPM L0s L1, Exit Latency L0s <2us, L1 <64us
>> ClockPM- Surprise- LLActRep- BwNot- ASPMOptComp-
>> LnkCtl: ASPM Disabled; RCB 64 bytes Disabled- CommClk-
>> ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
>> LnkSta: Speed 2.5GT/s, Width x1, TrErr- Train- SlotClk+ DLActive- BWMgmt- ABWMgmt-
>> DevCap2: Completion Timeout: Not Supported, 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: -6dB, EqualizationComplete-, EqualizationPhase1-
>> EqualizationPhase2-, EqualizationPhase3-, LinkEqualizationRequest-
>> Capabilities: [100 v1] Advanced Error Reporting
>> UESta: DLP- SDES- TLP- FCP- CmpltTO- CmpltAbrt- UnxCmplt- RxOF- MalfTLP- ECRC- UnsupReq- ACSViol-
>> UEMsk: DLP- SDES- TLP- FCP- CmpltTO- CmpltAbrt- UnxCmplt- RxOF- MalfTLP- ECRC- UnsupReq- ACSViol-
>> UESvrt: DLP+ SDES+ TLP- FCP+ CmpltTO- CmpltAbrt- UnxCmplt- RxOF+ MalfTLP+ ECRC- UnsupReq- ACSViol-
>> CESta: RxErr- BadTLP- BadDLLP- Rollover- Timeout- NonFatalErr-
>> CEMsk: RxErr- BadTLP- BadDLLP- Rollover- Timeout- NonFatalErr+
>> AERCap: First Error Pointer: 00, GenCap- CGenEn- ChkCap- ChkEn-
>> Capabilities: [140 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: [300 v1] Device Serial Number 00-00-00-00-00-00-00-00
>> Kernel driver in use: ath9k
>>
>> Here is the cat /proc/interrupts (after we do interface up):
>>
>> root@:~# ifconfig wlan0 up
>> [ 1548.926601] IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready
>> root@Xilinx-ZCU102-2016_3:~# cat /proc/interrupts
>> CPU0 CPU1 CPU2 CPU3
>> 1: 0 0 0 0 GICv2 29 Edge arch_timer
>> 2: 19873 20058 19089 17435 GICv2 30 Edge arch_timer
>> 12: 0 0 0 0 GICv2 156 Level zynqmp-dma
>> 13: 0 0 0 0 GICv2 157 Level zynqmp-dma
>> 14: 0 0 0 0 GICv2 158 Level zynqmp-dma
>> 15: 0 0 0 0 GICv2 159 Level zynqmp-dma
>> 16: 0 0 0 0 GICv2 160 Level zynqmp-dma
>> 17: 0 0 0 0 GICv2 161 Level zynqmp-dma
>> 18: 0 0 0 0 GICv2 162 Level zynqmp-dma
>> 19: 0 0 0 0 GICv2 163 Level zynqmp-dma
>> 20: 0 0 0 0 GICv2 164 Level Mali_GP_MMU, Mali_GP, Mali_PP0_MMU, Mali_PP0, Mali_PP1_MMU, Mali_PP1
>> 30: 0 0 0 0 GICv2 95 Level eth0, eth0
>> 206: 314 0 0 0 GICv2 49 Level cdns-i2c
>> 207: 40 0 0 0 GICv2 50 Level cdns-i2c
>> 209: 0 0 0 0 GICv2 150 Level nwl_pcie:misc
>> 214: 12 0 0 0 GICv2 47 Level ff0f0000.spi
>> 215: 0 0 0 0 GICv2 58 Level ffa60000.rtc
>> 216: 0 0 0 0 GICv2 59 Level ffa60000.rtc
>> 217: 0 0 0 0 GICv2 165 Level ahci-ceva[fd0c0000.ahci]
>> 218: 61 0 0 0 GICv2 81 Level mmc0
>> 219: 0 0 0 0 GICv2 187 Level arm-smmu global fault
>> 220: 471 0 0 0 GICv2 53 Level xuartps
>> 223: 0 0 0 0 GICv2 154 Level fd4c0000.dma
>> 224: 3 0 0 0 dummy 1 Edge ath9k
>> 225: 0 0 0 0 GICv2 97 Level xhci-hcd:usb1
>>
>> Regards,
>> Bharat

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