[PATCH v2 4/4] wcn36xx: Add debugfs entry to read firmware feature strings

[Loic Poulain]

On Tue, 19 Jul 2022 at 16:33, Bryan O'Donoghue
<bryan.odonoghue at linaro.org> wrote:
>
> Add in the ability to easily find the firmware feature bits reported in the
> get feature exchange without having to compile-in debug prints.
>
> root at linaro-alip:~# cat /sys/kernel/debug/ieee80211/phy0/wcn36xx/firmware_feat_caps
> MCC
> P2P
> DOT11AC
> SLM_SESSIONIZATION
> DOT11AC_OPMODE
> SAP32STA
> TDLS
> P2P_GO_NOA_DECOUPLE_INIT_SCAN
> WLANACTIVE_OFFLOAD
> BEACON_OFFLOAD
> SCAN_OFFLOAD
> BCN_MISS_OFFLOAD
> STA_POWERSAVE
> STA_ADVANCED_PWRSAVE
> BCN_FILTER
> RTT
> RATECTRL
> WOW
> WLAN_ROAM_SCAN_OFFLOAD
> SPECULATIVE_PS_POLL
> IBSS_HEARTBEAT_OFFLOAD
> WLAN_SCAN_OFFLOAD
> WLAN_PERIODIC_TX_PTRN
> ADVANCE_TDLS
> BATCH_SCAN
> FW_IN_TX_PATH
> EXTENDED_NSOFFLOAD_SLOT
> CH_SWITCH_V1
> HT40_OBSS_SCAN
> UPDATE_CHANNEL_LIST
> WLAN_MCADDR_FLT
> WLAN_CH144
> TDLS_SCAN_COEXISTENCE
> LINK_LAYER_STATS_MEAS
> MU_MIMO
> EXTENDED_SCAN
> DYNAMIC_WMM_PS
> MAC_SPOOFED_SCAN
> FW_STATS
> WPS_PRBRSP_TMPL
> BCN_IE_FLT_DELTA
>
> Signed-off-by: Bryan O'Donoghue <bryan.odonoghue at linaro.org>


Reviewed-by: Loic Poulain <loic.poulain at linaro.org>

> ---
>  drivers/net/wireless/ath/wcn36xx/debug.c | 37 ++++++++++++++++++++++++
>  drivers/net/wireless/ath/wcn36xx/debug.h |  1 +
>  2 files changed, 38 insertions(+)
>
> diff --git a/drivers/net/wireless/ath/wcn36xx/debug.c b/drivers/net/wireless/ath/wcn36xx/debug.c
> index 6af306ae41ad..220f338045bd 100644
> --- a/drivers/net/wireless/ath/wcn36xx/debug.c
> +++ b/drivers/net/wireless/ath/wcn36xx/debug.c
> @@ -21,6 +21,7 @@
>  #include "wcn36xx.h"
>  #include "debug.h"
>  #include "pmc.h"
> +#include "firmware.h"
>
>  #ifdef CONFIG_WCN36XX_DEBUGFS
>
> @@ -136,6 +137,40 @@ static const struct file_operations fops_wcn36xx_dump = {
>         .write =       write_file_dump,
>  };
>
> +static ssize_t read_file_firmware_feature_caps(struct file *file,
> +                                              char __user *user_buf,
> +                                              size_t count, loff_t *ppos)
> +{
> +       struct wcn36xx *wcn = file->private_data;
> +       unsigned long page = get_zeroed_page(GFP_KERNEL);
> +       char *p = (char *)page;
> +       int i;
> +       int ret;
> +
> +       if (!p)
> +               return -ENOMEM;
> +
> +       mutex_lock(&wcn->hal_mutex);
> +       for (i = 0; i < MAX_FEATURE_SUPPORTED; i++) {
> +               if (wcn36xx_firmware_get_feat_caps(wcn->fw_feat_caps, i)) {
> +                       p += sprintf(p, "%s\n",
> +                                    wcn36xx_firmware_get_cap_name(i));
> +               }
> +       }
> +       mutex_unlock(&wcn->hal_mutex);
> +
> +       ret = simple_read_from_buffer(user_buf, count, ppos, (char *)page,
> +                                     (unsigned long)p - page);
> +
> +       free_page(page);
> +       return ret;
> +}
> +
> +static const struct file_operations fops_wcn36xx_firmware_feat_caps = {
> +       .open = simple_open,
> +       .read = read_file_firmware_feature_caps,
> +};
> +
>  #define ADD_FILE(name, mode, fop, priv_data)           \
>         do {                                                    \
>                 struct dentry *d;                               \
> @@ -163,6 +198,8 @@ void wcn36xx_debugfs_init(struct wcn36xx *wcn)
>
>         ADD_FILE(bmps_switcher, 0600, &fops_wcn36xx_bmps, wcn);
>         ADD_FILE(dump, 0200, &fops_wcn36xx_dump, wcn);
> +       ADD_FILE(firmware_feat_caps, 0200,
> +                &fops_wcn36xx_firmware_feat_caps, wcn);
>  }
>
>  void wcn36xx_debugfs_exit(struct wcn36xx *wcn)
> diff --git a/drivers/net/wireless/ath/wcn36xx/debug.h b/drivers/net/wireless/ath/wcn36xx/debug.h
> index 46307aa562d3..7116d96e0543 100644
> --- a/drivers/net/wireless/ath/wcn36xx/debug.h
> +++ b/drivers/net/wireless/ath/wcn36xx/debug.h
> @@ -31,6 +31,7 @@ struct wcn36xx_dfs_entry {
>         struct dentry *rootdir;
>         struct wcn36xx_dfs_file file_bmps_switcher;
>         struct wcn36xx_dfs_file file_dump;
> +       struct wcn36xx_dfs_file file_firmware_feat_caps;
>  };
>
>  void wcn36xx_debugfs_init(struct wcn36xx *wcn);
> --
> 2.36.1
>