Re: [PATCH v8 1/4] ath11k: add support for device recovery for QCA6390/WCN6855

[Kalle Valo <kvalo@kernel.org>]

Wen Gong <quic_wgong@quicinc.com> writes:

> Currently ath11k has device recovery logic, it is introduced by this
> patch "ath11k: Add support for subsystem recovery" which is upstream
> by https://git.kernel.org/pub/scm/linux/kernel/git/kvalo/ath.git/commit/?h=ath11k-bringup&id=3a7b4838b6f6f234239f263ef3dc02e612a083ad.
>
> The patch is for AHB devices such as IPQ8074, it has remote proc module
> which is used to download the firmware and boots the processor which
> firmware is running on. If firmware crashed, remote proc module will
> detect it and download and boot firmware again. Below command will
> trigger a firmware crash, and then user can test feature of device
> recovery.
>
> Test command:
> echo assert > /sys/kernel/debug/ath11k/qca6390\ hw2.0/simulate_fw_crash
> echo assert > /sys/kernel/debug/ath11k/wcn6855\ hw2.0/simulate_fw_crash
>
> Unfortunately, QCA6390 is PCIe bus, it does not have the remote proc
> module, it use mhi module to communicate between firmware and ath11k.
> So ath11k does not support device recovery for QCA6390 currently.
>
> This patch is to add the extra logic which is different for QCA6390.
> When firmware crashed, MHI_CB_EE_RDDM event will be indicate by
> firmware and then ath11k_mhi_op_status_cb which is the callback of
> mhi_controller will receive the MHI_CB_EE_RDDM event, then ath11k
> will start to do recovery process, ath11k_core_reset() calls
> ath11k_hif_power_down()/ath11k_hif_power_up(), then the mhi/ath11k
> will start to download and boot firmware. There are some logic to
> avoid deadloop recovery and two simultaneous recovery operations.
> And because it has muti-radios for the soc, so it add some logic
> in ath11k_mac_op_reconfig_complete() to make sure all radios has
> reconfig complete and then complete the device recovery.
>
> Also it add workqueue_aux, because ab->workqueue is used when receive
> ATH11K_QMI_EVENT_FW_READY in recovery process(queue_work(ab->workqueue,
> &ab->restart_work)), and ath11k_core_reset will wait for max
> ATH11K_RESET_TIMEOUT_HZ for the previous restart_work finished, if
> ath11k_core_reset also queued in ab->workqueue, then it will delay
> restart_work of previous recovery and lead previous recovery fail.
>
> ath11k recovery success for QCA6390/WCN6855 after apply this patch.
>
> Tested-on: QCA6390 hw2.0 PCI WLAN.HST.1.0.1-01740-QCAHSTSWPLZ_V2_TO_X86-1
> Tested-on: WCN6855 hw2.0 PCI WLAN.HSP.1.1-03003-QCAHSPSWPL_V1_V2_SILICONZ_LITE-2
>
> Signed-off-by: Wen Gong <quic_wgong@quicinc.com>

[...]

>  void ath11k_core_free(struct ath11k_base *ab)
>  {
> +	flush_workqueue(ab->workqueue_aux);
> +	destroy_workqueue(ab->workqueue_aux);
> +
>  	flush_workqueue(ab->workqueue);
>  	destroy_workqueue(ab->workqueue);

This had a conflict and in the pending branch I removed
flush_workqueue(ab->workqueue_aux). Flush is not needed before destroy.

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