[PATCH] wifi: ath12k: add support for collecting firmware log

[Kalle Valo]

Baochen Qiang <quic_bqiang at quicinc.com> writes:

> Currently there is no way to collect firmware log because firmware
> does not send it to host. Also host does not handle WMI_DIAG_EVENTID
> which is used by firmware to upload firmware log.
>
> So add support for it by firstly enabling firmware log upload via a
> QMI message, and secondly processing WMI DIAG event to expose it to
> userspace via trace event.
>
> This change applies to both WCN7850 and QCN9274.
>
> Tested-on: WCN7850 hw2.0 PCI
> WLAN.HMT.1.0-03427-QCAHMTSWPL_V1.0_V2.0_SILICONZ-1.15378.4
>
> Signed-off-by: Baochen Qiang <quic_bqiang at quicinc.com>

I did some cosmetic changes like reverse xmas tree, debug messages etc. 

> +static int ath12k_qmi_wlanfw_wlan_ini_send(struct ath12k_base *ab, bool enable)

As enable was always true I removed it. We can add it back later if it's
needed.

> +struct qmi_wlanfw_wlan_ini_req_msg_v01 {
> +	/* Must be set to true if enablefwlog is being passed */
> +	u8 enablefwlog_valid;
> +	u8 enablefwlog;

'enablefwlog' is really awkward and it's used in several places, why not
'enable_fwlog' which is far more readable? I could change that in the
pending branch.

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