From: Bharat Kumar Gogada <bharat.kumar.gogada@xilinx.com>
To: Bjorn Helgaas <helgaas@kernel.org>
CC: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "linux-pci@vger.kernel.org" <linux-pci@vger.kernel.org>,
        Marc Zyngier <marc.zyngier@arm.com>,
        "Janusz.Dziedzic@tieto.com" <Janusz.Dziedzic@tieto.com>,
        "rmanohar@qti.qualcomm.com" <rmanohar@qti.qualcomm.com>,
        Kalle Valo <kvalo@codeaurora.org>,
        "ath9k-devel@qca.qualcomm.com" <ath9k-devel@qca.qualcomm.com>
Subject: RE: ATH9 driver issues on ARM64
Thread-Topic: ATH9 driver issues on ARM64
Thread-Index: AQHSUWNLKRFHQUL67ky5AgPY+zl5DKD+JeSA
Date: Thu, 8 Dec 2016 15:29:08 +0000
Message-ID: <8520D5D51A55D047800579B094147198263A72F5@XAP-PVEXMBX02.xlnx.xilinx.com>
References: <8520D5D51A55D047800579B094147198263A7222@XAP-PVEXMBX02.xlnx.xilinx.com>
 <20161208145608.GA19822@bhelgaas-glaptop.roam.corp.google.com>
In-Reply-To: <20161208145608.GA19822@bhelgaas-glaptop.roam.corp.google.com>
Accept-Language: en-US
Content-Language: en-US
Content-Type: text/plain; charset="us-ascii"
MIME-Version: 1.0
SpamDiagnosticOutput: 1:99
SpamDiagnosticMetadata: NSPM
X-MS-Exchange-CrossTenant-OriginalArrivalTime: 08 Dec 2016 15:29:12.4473
 (UTC)
X-MS-Exchange-CrossTenant-Id: 657af505-d5df-48d0-8300-c31994686c5c
X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=657af505-d5df-48d0-8300-c31994686c5c;Ip=[149.199.60.83];Helo=[xsj-pvapsmtpgw01]
X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem
X-MS-Exchange-Transport-CrossTenantHeadersStamped: BN3PR0201MB0882
Sender: linux-kernel-owner@vger.kernel.org
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org
Content-Transfer-Encoding: 8bit
X-MIME-Autoconverted: from quoted-printable to 8bit by mail.home.local id uB8G2G1b007057
Content-Length: 20563
Lines: 384

 > [+cc Kalle, ath9k list]
> 
> 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


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