Configuration:
* NVidia T30
* AR9485 (also AR9460)
* Kernel 4.6.2
Our company is developing a product on an ARM based platform which requires use
of MSI interrupts (legacy interrupts do not seem to work). I have updated the
ath9k driver to enable MSI interrupts, however I have a few questions:
ISSUE 1:
When I enable MSI interrupts and allocate ISR it appears the interrupt is
masked.
Pseudo code as follows:
* REG_WRITE(ah, AR_PCIE_MSI, AR_PCIE_MSI_ENABLE);
* num_irq = pci_msi_vec_count(pdev);
* ret = pci_enable_msi_range(pdev, 1, num_irq);
Resulting in:
lspci -v
01:00.0 Network controller: Qualcomm Atheros AR9485 Wireless Network Adapter
(rev 01)
Subsystem: Qualcomm Atheros AR9485 Wireless Network Adapter
Flags: bus master, fast devsel, latency 0, IRQ 391
Memory at 20000000 (64-bit, non-prefetchable) [size=512K]
[virtual] Expansion ROM at 20080000 [disabled] [size=64K]
Capabilities: [40] Power Management version 2
Capabilities: [50] MSI: Enable+ Count=1/4 Maskable+ 64bit+
Capabilities: [70] Express Endpoint, MSI 00
Capabilities: [100] Advanced Error Reporting
Capabilities: [140] Virtual Channel
Capabilities: [160] Device Serial Number 00-00-00-00-00-00-00-00
Kernel driver in use: ath9k
Kernel modules: ath9k
If I dump the MSI entry (msi_desc ) I see the Aug 1 16:19:17 s02702016 kernel:
[ 311.350904] ath: phy0: ATH9K PCI-MSI-LIST-ENTRY: 0 Aug 1 16:19:17 s02702016
kernel: [ 311.352673] ath: phy0: ATH9K PCI-MSI-LIST-IRQ: 391 Aug 1 16:19:17
s02702016 kernel: [ 311.352695] ath: phy0: ATH9K PCI-MSI-LIST-NVEC: 1 Aug 1
16:19:17 s02702016 kernel: [ 311.352714] ath: phy0: ATH9K PCI-MSI-LIST-MASKED:
fffffffe Aug 1 16:19:17 s02702016 kernel: [ 311.352732] ath: phy0: ATH9K
PCI-MSI-LIST-ISMSIX: 0 Aug 1 16:19:17 s02702016 kernel: [ 311.352750] ath:
phy0: ATH9K PCI-MSI-LIST-MULTI: 0 Aug 1 16:19:17 s02702016 kernel: [
311.352767] ath: phy0: ATH9K PCI-MSI-LIST-MULTICAP: 2 Aug 1 16:19:17 s02702016
kernel: [ 311.352783] ath: phy0: ATH9K PCI-MSI-LIST-MASK: 1 Aug 1 16:19:17
s02702016 kernel: [ 311.352800] ath: phy0: ATH9K PCI-MSI-LIST-ENTRY: 0
SYSLOG
Jul 29 18:38:33 s02702016 kernel: [ 128.363804] WARNING: CPU: 1 PID: 1138 at
kernel/irq/manage.c:511 __enable_irq+0x54/0x80 Jul 29 18:38:33 s02702016
kernel: [ 128.364078] [<c0128d78>] (warn_slowpath_fmt) from [<c01a162c>]
(__enable_irq+0x54/0x80) Jul 29 18:38:33 s02702016 kernel: [ 128.364113]
[<c01a162c>] (__enable_irq) from [<c01a169c>] (enable_irq+0x44/0x7c) Jul 29
18:38:33 s02702016 kernel: [ 128.364393] [<c01a169c>] (enable_irq) from
[<bf277b74>] (ath_pci_probe+0x568/0x944 [ath9k]) Jul 29 18:38:33 s02702016
kernel: [ 128.366378] WARNING: CPU: 1 PID: 1138 at kernel/irq/manage.c:511
__enable_irq+0x54/0x80 Jul 29 18:38:33 s02702016 kernel: [ 128.367054]
[<c0128d78>] (warn_slowpath_fmt) from [<c01a162c>] (__enable_irq+0x54/0x80) Jul
29 18:38:33 s02702016 kernel: [ 128.367127] [<c01a162c>] (__enable_irq) from
[<c01a169c>] (enable_irq+0x44/0x7c) Jul 29 18:38:33 s02702016 kernel: [
128.367345] [<c01a169c>] (enable_irq) from [<bf277d40>]
(ath_pci_probe+0x734/0x944 [ath9k]) Jul
29 18:38:33 s02702016 kernel: [ 128.368975] ieee80211 phy0: Atheros AR9462
Rev:2 mem=0xf2000000, irq=391
I suspect that I need to write a register to un-mask the MSI interrupts.
NOTE: I have other peripherals (wired Ethernet) which uses MSI-X interrupts
with no issue.
ISSUE 2
The number of vectors supported indicates 4. However when I call:
* pci_enable_msi_range(pdev, 1, num_irq);
It returns that only a single IRQ is allocated.
This seems problematic as I expect that there are separate IRQ for
RX/TX/error/control.
Any help would be appreciated.
-Lamar
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