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| author | Kang Yang <quic_kangyang@quicinc.com> | 2023-12-01 18:09:47 +0200 |
|---|---|---|
| committer | Kalle Valo <quic_kvalo@quicinc.com> | 2023-12-05 17:04:18 +0200 |
| commit | 1b66601d14161f8128760742236eb26324f04fb9 (patch) | |
| tree | 3278e9d72a4400d6fff06c2248a5bb1f89505853 /tools/testing/selftests/bpf/prog_tests/autoload.c | |
| parent | 8cc18a70913fcdc8ac06796ca91304df0a51b6b5 (diff) | |
wifi: ath12k: get msi_data again after request_irq is called
The reservation mode of interrupts in kernel assigns a dummy vector
when the interrupt is allocated and assigns a real vector when the
request_irq is called. The reservation mode helps to ease vector
pressure when devices with a large amount of queues/interrupts are
initialized, but only a minimal subset of those queues/interrupts
is actually used.
So on reservation mode, the msi_data may change after request_irq is
called, then it will lead to spurious interrupt. But when VT-d in
BIOS is enabled and ath12k can get 32 MSI vectors, ath12k always get
the same msi_data before and after request_irq.
So in case of one MSI vector, ath12k need read msi_data again after
request_irq is called, and then the correct msi_data is programmed
into WCN7850 hardware components.
Tested-on: WCN7850 hw2.0 PCI WLAN.HMT.1.0-03427-QCAHMTSWPL_V1.0_V2.0_SILICONZ-1.15378.4
Signed-off-by: Kang Yang <quic_kangyang@quicinc.com>
Acked-by: Jeff Johnson <quic_jjohnson@quicinc.com>
Signed-off-by: Kalle Valo <quic_kvalo@quicinc.com>
Link: https://lore.kernel.org/r/20231121021304.12966-2-quic_kangyang@quicinc.com
Diffstat (limited to 'tools/testing/selftests/bpf/prog_tests/autoload.c')
0 files changed, 0 insertions, 0 deletions