From mboxrd@z Thu Jan  1 00:00:00 1970
From: Alex Hacker <hacker@epn.ru>
Date: Thu, 19 May 2011 18:16:57 +0600
Subject: [ath9k-devel] AR9380 MSI
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On Thu, May 19, 2011 at 04:35:59PM +0800, Sucheta ROY wrote:
> Hi,
> 
> I believe you have AR9380 card installed in your PC? 
> 
> You have to build your kernel with CONFIG_PCI_MSI option enabled. "CONFIG_PCI_MSI" Depends on: PCI [=y] && ARCH_SUPPORTS_MSI [=y]. Also you have to include
> int pci_enable_msi(struct pci_dev *dev)  function in pci.c file of ath9k. This function should be called before the driver calls request_irq().With a successful call the device will be switched from pin-based legacy interrupt mode to MSI mode.  The dev->irq number will be changed to a new number which represents the message signaled interrupt.
> 
> Also can you please let me know PCI Vendor Id/Device Id of this card ie AR9380? 
> 
> Thanks in advance for your support.
> 
> Regards,
> Sucheta


The results I got below. If I do something wrong advise me what I should do.

--- pci.c.old	2011-05-19 17:59:59.000000000 +0600
+++ pci.c	2011-05-19 18:00:14.000000000 +0600
@@ -221,6 +221,9 @@
 	/* Will be cleared in ath9k_start() */
 	sc->sc_flags |= SC_OP_INVALID;
 
+printk("pci_enable_msi=%d.\n",pci_enable_msi(pdev));
+printk("pdev->irq=%d.\n",pdev->irq);
+
 	ret = request_irq(pdev->irq, ath_isr, IRQF_SHARED, "ath9k", sc);
 	if (ret) {

# cat /proc/interrupts
 		dev_err(&pdev->dev, "request_irq failed\n");
           CPU0       CPU1       
  0:        393       2628   IO-APIC-edge      timer
  1:      35884     676360   IO-APIC-edge      i8042
  4:         45     262178   IO-APIC-edge      serial
  8:          1          0   IO-APIC-edge      rtc0
  9:          0          0   IO-APIC-fasteoi   acpi
 14:          0          0   IO-APIC-edge      ata_piix
 15:          0          0   IO-APIC-edge      ata_piix
 16:      30197  110785854   IO-APIC-fasteoi   uhci_hcd:usb5
 18:          0          0   IO-APIC-fasteoi   uhci_hcd:usb4
 19:     173216   10744489   IO-APIC-fasteoi   ata_piix, uhci_hcd:usb3
 20:  191379417        133   IO-APIC-fasteoi   eth0
 23:     776135   27633305   IO-APIC-fasteoi   ehci_hcd:usb1, uhci_hcd:usb2
 42:          0          0   PCI-MSI-edge      ath9k
NMI:          0          0   Non-maskable interrupts
LOC:  527052638  535023710   Local timer interrupts
SPU:          0          0   Spurious interrupts
PMI:          0          0   Performance monitoring interrupts
IWI:          0          0   IRQ work interrupts
RES:    3026801    3065734   Rescheduling interrupts
CAL:      14585      15117   Function call interrupts
TLB:      78368     128713   TLB shootdowns
TRM:          0          0   Thermal event interrupts
THR:          0          0   Threshold APIC interrupts
MCE:          0          0   Machine check exceptions
MCP:       2981       2981   Machine check polls
ERR:          1
MIS:          0

# lspci -vvn
02:00.0 Class 0280: 168c:0030 (rev 01)
	Subsystem: 168c:3112
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
	Status: Cap+ 66Mhz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR-
	Latency: 0, cache line size 08
	Interrupt: pin A routed to IRQ 42
	Region 0: Memory at feae0000 (64-bit, non-prefetchable) [size=128K]
	Expansion ROM@fead0000 [disabled] [size=64K]
	Capabilities: [40] Power Management version 3
		Flags: PMEClk- DSI- D1+ D2- AuxCurrent=375mA PME(D0+,D1+,D2-,D3hot+,D3cold-)
		Status: D0 PME-Enable- DSel=0 DScale=0 PME-
	Capabilities: [50] Message Signalled Interrupts: 64bit+ Queue=0/2 Enable+
		Address: 00000000fee0300c  Data: 4179
	Capabilities: [70] #10 [0002]

# modprobe ath9k
# iw dev wlan0 set freq 5240
# iw dev wlan0 set monitor none
# ifconfig wlan0 up
# dmesg

May 19 17:51:00 hacker kernel: ath9k 0000:02:00.0: PCI INT A -> GSI 16 (level, low) -> IRQ 16
May 19 17:51:00 hacker kernel: ath9k 0000:02:00.0: setting latency timer to 64
May 19 17:51:00 hacker kernel: ath9k 0000:02:00.0: irq 42 for MSI/MSI-X
May 19 17:51:00 hacker kernel: pci_enable_msi=0.
May 19 17:51:00 hacker kernel: pdev->irq=42.
May 19 17:51:00 hacker kernel: ath: EEPROM regdomain: 0x0
May 19 17:51:00 hacker kernel: ath: EEPROM indicates default country code should be used
May 19 17:51:00 hacker kernel: ath: doing EEPROM country->regdmn map search
May 19 17:51:00 hacker kernel: ath: country maps to regdmn code: 0x3a
May 19 17:51:00 hacker kernel: ath: Country alpha2 being used: US
May 19 17:51:00 hacker kernel: ath: Regpair used: 0x3a
May 19 17:51:00 hacker kernel: ieee80211 phy1: Selected rate control algorithm 'ath9k_rate_control'
May 19 17:51:00 hacker kernel: Registered led device: ath9k-phy1::radio
May 19 17:51:00 hacker kernel: Registered led device: ath9k-phy1::assoc
May 19 17:51:00 hacker kernel: Registered led device: ath9k-phy1::tx
May 19 17:51:00 hacker kernel: Registered led device: ath9k-phy1::rx
May 19 17:51:00 hacker kernel: ieee80211 phy1: Atheros AR9300 Rev:3 mem=0xf8640000, irq=42
May 19 17:53:59 hacker kernel: do_IRQ: 0.120 No irq handler for vector (irq -1)
May 19 17:53:59 hacker kernel: do_IRQ: 1.120 No irq handler for vector (irq -1)
May 19 17:53:59 hacker kernel: do_IRQ: 1.120 No irq handler for vector (irq -1)
May 19 17:54:06 hacker kernel: device wlan0 entered promiscuous mode

Does not work.