Introduction
The following blog post discusses on the procedure of enabling Debug flag in FMAC driver.
Steps
1. If you are building against the running kernel , then enable the following flags in the .config file while preparing the brcmfmac module.
CPTCFG_BRCM_TRACING=y
CPTCFG_BRCMDBG=y
CPTCFG_BRCMFMAC_PROTO_BCDC=y
CPTCFG_BRCMFMAC_PROTO_MSGBUF=y
else if you are building with the kernel source, then modify the .config of the kernel source with the following
CONFIG_BRCMDBG=y
CONFIG_DEBUG_FS=y
2. Compile the brcmfmac driver source for the kernel for which it is being used.
#apply the required patch from the latest release.
#patch -p1<diff_fix_linux-v4.12_kernel_for_brcmfmac_build.patch
$make -C <path_to_kernel_src> M=<fmac_source_dir>
To build against the running kernel use:
$ make -C /lib/modules/`uname -r`/build M=$PWD
3. Enable brcmfmac debug log
$echo 8 > /proc/sys/kernel/printk
4. Insert the driver module with the required message level as module parameter.
list out the parameters accepted by the brcmfmac driver that is inserted in the kernel.
$ls /sys/module/brcmfmac/parameters/
$insmod brcmfmac.ko debug=${BRCMF_Message_Level}
Following are a list of Message levels defined in the debug.h(/v4.14.52-backports/drivers/net/wireless/broadcom/brcm80211/brcmfmac/debug.h)
#define BRCMF_TRACE_VAL 0x00000002
#define BRCMF_INFO_VAL 0x00000004
#define BRCMF_DATA_VAL 0x00000008
#define BRCMF_CTL_VAL 0x00000010
#define BRCMF_TIMER_VAL 0x00000020
#define BRCMF_HDRS_VAL 0x00000040
#define BRCMF_BYTES_VAL 0x00000080
#define BRCMF_INTR_VAL 0x00000100
#define BRCMF_GLOM_VAL 0x00000200
#define BRCMF_EVENT_VAL 0x00000400
#define BRCMF_BTA_VAL 0x00000800
#define BRCMF_FIL_VAL 0x00001000
#define BRCMF_USB_VAL 0x00002000
#define BRCMF_SCAN_VAL 0x00004000
#define BRCMF_CONN_VAL 0x00008000
#define BRCMF_BCDC_VAL 0x00010000
#define BRCMF_SDIO_VAL 0x00020000
#define BRCMF_MSGBUF_VAL 0x00040000
#define BRCMF_PCIE_VAL 0x00080000
#define BRCMF_FWCON_VAL 0x00100000
#define BRCMF_ULP_VAL 0x00200000
eg: To enable wifi fw console log
$ insmod brcmfmac.ko debug=0x00100006 (TRACE, INFO and WIFI_FW_LOG)
eg: To enable Trace
$ insmod brcmfmac.ko debug=0x6 (TRACE and INFO )
For further details on the functions associatied with fmac debug, please look into the source code @
/v4.14.52-backports/drivers/net/wireless/broadcom/brcm80211/brcmfmac/debug.c
