en:users:drivers:iwlwifi:debugging
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| Both sides previous revision Previous revision Next revision | Previous revision Next revision Both sides next revision | ||
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en:users:drivers:iwlwifi:debugging [2019/02/06 13:14] Emmanuel Grumbach |
en:users:drivers:iwlwifi:debugging [2022/03/31 09:45] Georg Müller [Tracing] Option is called IWLWIFI_DEVICE_TRACING, not IWLWIFI_TRACING |
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| ===== How to report? ===== | ===== How to report? ===== | ||
| - | Issues can be filed in [[http://bugzilla.kernel.org|kernel's bugzilla]]. Make sure to add [[mailto:linuxwifi@intel.com|linuxwifi@intel.com]] to the bug. | + | Issues can be filed in [[http://bugzilla.kernel.org|kernel's bugzilla]]. |
| + | |||
| + | Make sure to set | ||
| + | |||
| + | * Product: Drivers | ||
| + | * Component: network-wireless-intel | ||
| Always attach the kernel log to your reports: | Always attach the kernel log to your reports: | ||
| <code>dmesg > dmesg.log</code> and attach dmesg.log to the bug. | <code>dmesg > dmesg.log</code> and attach dmesg.log to the bug. | ||
| Line 25: | Line 31: | ||
| ==== Prints ==== | ==== Prints ==== | ||
| - | The simplest way to provide minimal output is to dump your kernel log: dmesg. Sometimes we will ask for logs from the supplicant too - they typically land in syslog. iwlwifi can print more data to the kernel log if asked to: this is controlled by the debug module parameter. This is a [[https://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/tree/drivers/net/wireless/intel/iwlwifi/iwl-debug.h#n143|bitmap]]. To see more debug prints, [[https://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/tree/drivers/net/wireless/intel/iwlwifi/Kconfig#n105|CONFIG_IWLWIFI_DEBUG]] must be enabled. | + | The simplest way to provide minimal output is to dump your kernel log: dmesg. Sometimes we will ask for logs from the supplicant too - they typically land in syslog. iwlwifi can print more data to the kernel log if asked to: this is controlled by the debug module parameter. This is a [[https://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/tree/drivers/net/wireless/intel/iwlwifi/iwl-debug.h#n129|bitmap]]. To see more debug prints, [[https://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/tree/drivers/net/wireless/intel/iwlwifi/Kconfig#n105|CONFIG_IWLWIFI_DEBUG]] must be enabled. |
| Please don't add debug level unless instructed to do so. Adding more prints typically adds useless information. | Please don't add debug level unless instructed to do so. Adding more prints typically adds useless information. | ||
| Line 36: | Line 42: | ||
| <code>sudo trace-cmd record -e iwlwifi -e mac80211 -e cfg80211 -e iwlwifi_msg</code> | <code>sudo trace-cmd record -e iwlwifi -e mac80211 -e cfg80211 -e iwlwifi_msg</code> | ||
| - | This records all the data that goes from and to the firmware. The output is a file: trace.dat which you can compress prior to sending. To enable tracing, [[https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/tree/drivers/net/wireless/intel/iwlwifi/Kconfig#n139|CONFIG_IWLWIFI_TRACING]] must be set. | + | This records all the data that goes from and to the firmware. The output is a file: trace.dat which you can compress prior to sending. To enable tracing, [[https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/tree/drivers/net/wireless/intel/iwlwifi/Kconfig#n139|CONFIG_IWLWIFI_DEVICE_TRACING]] must be set. |
| **//Note: you must not remove the iwlwifi kernel module while tracing is running. You need to stop the tracing first!//** | **//Note: you must not remove the iwlwifi kernel module while tracing is running. You need to stop the tracing first!//** | ||
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| Getting data from the firmware can often provide a lot of information, especially when the traffic is being stalled, latency is high, queues are stuck etc.. Here is how to do so. This is working starting kernel 3.19. | Getting data from the firmware can often provide a lot of information, especially when the traffic is being stalled, latency is high, queues are stuck etc.. Here is how to do so. This is working starting kernel 3.19. | ||
| - | First you'll need to allow DEV_COREDUMP by setting CONFIG_ALLOW_DEV_COREDUMP to Y. | + | You'll need to allow DEV_COREDUMP by setting CONFIG_ALLOW_DEV_COREDUMP to Y. |
| Then, you'll need to create a core dump. This can be done by: | Then, you'll need to create a core dump. This can be done by: | ||
en/users/drivers/iwlwifi/debugging.txt · Last modified: 2022/05/30 08:07 by Johannes Berg
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