wifi: iwlwifi: mvm: add a debugfs hook to clear the monitor data

This can be used by the user space when it wants to clear the data we
collected so far for privacy reasons.

Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Miri Korenblit <miriam.rachel.korenblit@intel.com>
Link: https://msgid.link/20231207044813.d5e97d5ec0d9.I7a5e836e6109e1fce7e6301dba8d1f28e60a5440@changeid
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

5 files changed, 29 insertions, 1 deletions

diff --git a/drivers/net/wireless/intel/iwlwifi/fw/dbg.c b/drivers/net/wireless/intel/iwlwifi/fw/dbg.c
index 7ee9b7c8a3ab..f6e399d1e95c 100644
--- a/drivers/net/wireless/intel/iwlwifi/fw/dbg.c
+++ b/drivers/net/wireless/intel/iwlwifi/fw/dbg.c
@@ -3395,3 +3395,13 @@ void iwl_fw_disable_dbg_asserts(struct iwl_fw_runtime *fwrt)
 	iwl_trans_send_cmd(fwrt->trans, &hcmd);
 }
 IWL_EXPORT_SYMBOL(iwl_fw_disable_dbg_asserts);
+
+void iwl_fw_dbg_clear_monitor_buf(struct iwl_fw_runtime *fwrt)
+{
+	struct iwl_fw_dbg_params params = {0};
+
+	iwl_fw_dbg_stop_sync(fwrt);
+	iwl_dbg_tlv_init_cfg(fwrt);
+	iwl_fw_dbg_stop_restart_recording(fwrt, &params, false);
+}
+IWL_EXPORT_SYMBOL(iwl_fw_dbg_clear_monitor_buf);
diff --git a/drivers/net/wireless/intel/iwlwifi/fw/dbg.h b/drivers/net/wireless/intel/iwlwifi/fw/dbg.h
index 66b233250c7c..eb38c686b5cb 100644
--- a/drivers/net/wireless/intel/iwlwifi/fw/dbg.h
+++ b/drivers/net/wireless/intel/iwlwifi/fw/dbg.h
@@ -330,6 +330,7 @@ void iwl_send_dbg_dump_complete_cmd(struct iwl_fw_runtime *fwrt,
 				    u32 timepoint,
 				    u32 timepoint_data);
 void iwl_fw_disable_dbg_asserts(struct iwl_fw_runtime *fwrt);
+void iwl_fw_dbg_clear_monitor_buf(struct iwl_fw_runtime *fwrt);
 
 #define IWL_FW_CHECK_FAILED(_obj, _fmt, ...)				\
 	IWL_ERR_LIMIT(_obj, _fmt, __VA_ARGS__)
diff --git a/drivers/net/wireless/intel/iwlwifi/iwl-dbg-tlv.c b/drivers/net/wireless/intel/iwlwifi/iwl-dbg-tlv.c
index b658cf228fbe..3b14f6476743 100644
--- a/drivers/net/wireless/intel/iwlwifi/iwl-dbg-tlv.c
+++ b/drivers/net/wireless/intel/iwlwifi/iwl-dbg-tlv.c
@@ -1274,7 +1274,7 @@ iwl_dbg_tlv_tp_trigger(struct iwl_fw_runtime *fwrt, bool sync,
 	return 0;
 }
 
-static void iwl_dbg_tlv_init_cfg(struct iwl_fw_runtime *fwrt)
+void iwl_dbg_tlv_init_cfg(struct iwl_fw_runtime *fwrt)
 {
 	enum iwl_fw_ini_buffer_location *ini_dest = &fwrt->trans->dbg.ini_dest;
 	int ret, i;
diff --git a/drivers/net/wireless/intel/iwlwifi/iwl-dbg-tlv.h b/drivers/net/wireless/intel/iwlwifi/iwl-dbg-tlv.h
index 06fb7d665390..7ed6329fd8ca 100644
--- a/drivers/net/wireless/intel/iwlwifi/iwl-dbg-tlv.h
+++ b/drivers/net/wireless/intel/iwlwifi/iwl-dbg-tlv.h
@@ -57,6 +57,7 @@ void _iwl_dbg_tlv_time_point(struct iwl_fw_runtime *fwrt,
 			     enum iwl_fw_ini_time_point tp_id,
 			     union iwl_dbg_tlv_tp_data *tp_data,
 			     bool sync);
+void iwl_dbg_tlv_init_cfg(struct iwl_fw_runtime *fwrt);
 
 static inline void iwl_dbg_tlv_time_point(struct iwl_fw_runtime *fwrt,
 					  enum iwl_fw_ini_time_point tp_id,
diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/debugfs.c b/drivers/net/wireless/intel/iwlwifi/mvm/debugfs.c
index 329c545f65fd..e016fce7ab24 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/debugfs.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/debugfs.c
@@ -1714,6 +1714,20 @@ static ssize_t iwl_dbgfs_fw_dbg_collect_write(struct iwl_mvm *mvm,
 	return count;
 }
 
+static ssize_t iwl_dbgfs_fw_dbg_clear_write(struct iwl_mvm *mvm,
+					    char *buf, size_t count,
+					    loff_t *ppos)
+{
+	if (mvm->trans->trans_cfg->device_family < IWL_DEVICE_FAMILY_9000)
+		return -EOPNOTSUPP;
+
+	mutex_lock(&mvm->mutex);
+	iwl_fw_dbg_clear_monitor_buf(&mvm->fwrt);
+	mutex_unlock(&mvm->mutex);
+
+	return count;
+}
+
 static ssize_t iwl_dbgfs_dbg_time_point_write(struct iwl_mvm *mvm,
 					      char *buf, size_t count,
 					      loff_t *ppos)
@@ -2166,6 +2180,7 @@ MVM_DEBUGFS_WRITE_FILE_OPS(bt_force_ant, 10);
 MVM_DEBUGFS_READ_WRITE_FILE_OPS(scan_ant_rxchain, 8);
 MVM_DEBUGFS_READ_WRITE_FILE_OPS(fw_dbg_conf, 8);
 MVM_DEBUGFS_WRITE_FILE_OPS(fw_dbg_collect, 64);
+MVM_DEBUGFS_WRITE_FILE_OPS(fw_dbg_clear, 64);
 MVM_DEBUGFS_WRITE_FILE_OPS(dbg_time_point, 64);
 MVM_DEBUGFS_WRITE_FILE_OPS(indirection_tbl,
 			   (IWL_RSS_INDIRECTION_TABLE_SIZE * 2));
@@ -2372,6 +2387,7 @@ void iwl_mvm_dbgfs_register(struct iwl_mvm *mvm)
 	MVM_DEBUGFS_ADD_FILE(prph_reg, mvm->debugfs_dir, 0600);
 	MVM_DEBUGFS_ADD_FILE(fw_dbg_conf, mvm->debugfs_dir, 0600);
 	MVM_DEBUGFS_ADD_FILE(fw_dbg_collect, mvm->debugfs_dir, 0200);
+	MVM_DEBUGFS_ADD_FILE(fw_dbg_clear, mvm->debugfs_dir, 0200);
 	MVM_DEBUGFS_ADD_FILE(dbg_time_point, mvm->debugfs_dir, 0200);
 	MVM_DEBUGFS_ADD_FILE(send_echo_cmd, mvm->debugfs_dir, 0200);
 	MVM_DEBUGFS_ADD_FILE(indirection_tbl, mvm->debugfs_dir, 0200);