iwlwifi: mvm: export last bt_notif through debugfs

This will allow to track how BT core updates the driver.
This is required to debug the BT Coexistence mechanism.

Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

3 files changed, 104 insertions, 0 deletions

diff --git a/drivers/net/wireless/iwlwifi/mvm/bt-coex.c b/drivers/net/wireless/iwlwifi/mvm/bt-coex.c
index fa054b364e52..47954deb6493 100644
--- a/drivers/net/wireless/iwlwifi/mvm/bt-coex.c
+++ b/drivers/net/wireless/iwlwifi/mvm/bt-coex.c
@@ -307,6 +307,9 @@ int iwl_mvm_rx_bt_coex_notif(struct iwl_mvm *mvm,
                        notif->bt_agg_traffic_load);
         IWL_DEBUG_COEX(mvm, "\tBT ci compliance %d\n", notif->bt_ci_compliance);
 
+        /* remember this notification for future use: rssi fluctuations */
+        memcpy(&mvm->last_bt_notif, notif, sizeof(mvm->last_bt_notif));
+
         ieee80211_iterate_active_interfaces_atomic(
                                         mvm->hw, IEEE80211_IFACE_ITER_NORMAL,
                                         iwl_mvm_bt_notif_iterator, &data);
diff --git a/drivers/net/wireless/iwlwifi/mvm/debugfs.c b/drivers/net/wireless/iwlwifi/mvm/debugfs.c
index 2ad301164bd9..56bf601f8991 100644
--- a/drivers/net/wireless/iwlwifi/mvm/debugfs.c
+++ b/drivers/net/wireless/iwlwifi/mvm/debugfs.c
@@ -300,6 +300,104 @@ static ssize_t iwl_dbgfs_power_down_d3_allow_write(struct file *file,
         return count;
 }
 
+#define BT_MBOX_MSG(_notif, _num, _field)                                    \
+        ((le32_to_cpu((_notif)->mbox_msg[(_num)]) & BT_MBOX##_num##_##_field)\
+        >> BT_MBOX##_num##_##_field##_POS)
+
+
+#define BT_MBOX_PRINT(_num, _field, _end)                                   \
+                        pos += scnprintf(buf + pos, bufsz - pos,            \
+                                         "\t%s: %d%s",                      \
+                                         #_field,                           \
+                                         BT_MBOX_MSG(notif, _num, _field),  \
+                                         true ? "\n" : ", ");
+
+static ssize_t iwl_dbgfs_bt_notif_read(struct file *file, char __user *user_buf,
+                                       size_t count, loff_t *ppos)
+{
+        struct iwl_mvm *mvm = file->private_data;
+        struct iwl_bt_coex_profile_notif *notif = &mvm->last_bt_notif;
+        char *buf;
+        int ret, pos = 0, bufsz = sizeof(char) * 1024;
+
+        buf = kmalloc(bufsz, GFP_KERNEL);
+        if (!buf)
+                return -ENOMEM;
+
+        mutex_lock(&mvm->mutex);
+
+        pos += scnprintf(buf+pos, bufsz-pos, "MBOX dw0:\n");
+
+        BT_MBOX_PRINT(0, LE_SLAVE_LAT, false);
+        BT_MBOX_PRINT(0, LE_PROF1, false);
+        BT_MBOX_PRINT(0, LE_PROF2, false);
+        BT_MBOX_PRINT(0, LE_PROF_OTHER, false);
+        BT_MBOX_PRINT(0, CHL_SEQ_N, false);
+        BT_MBOX_PRINT(0, INBAND_S, false);
+        BT_MBOX_PRINT(0, LE_MIN_RSSI, false);
+        BT_MBOX_PRINT(0, LE_SCAN, false);
+        BT_MBOX_PRINT(0, LE_ADV, false);
+        BT_MBOX_PRINT(0, LE_MAX_TX_POWER, false);
+        BT_MBOX_PRINT(0, OPEN_CON_1, true);
+
+        pos += scnprintf(buf+pos, bufsz-pos, "MBOX dw1:\n");
+
+        BT_MBOX_PRINT(1, BR_MAX_TX_POWER, false);
+        BT_MBOX_PRINT(1, IP_SR, false);
+        BT_MBOX_PRINT(1, LE_MSTR, false);
+        BT_MBOX_PRINT(1, AGGR_TRFC_LD, false);
+        BT_MBOX_PRINT(1, MSG_TYPE, false);
+        BT_MBOX_PRINT(1, SSN, true);
+
+        pos += scnprintf(buf+pos, bufsz-pos, "MBOX dw2:\n");
+
+        BT_MBOX_PRINT(2, SNIFF_ACT, false);
+        BT_MBOX_PRINT(2, PAG, false);
+        BT_MBOX_PRINT(2, INQUIRY, false);
+        BT_MBOX_PRINT(2, CONN, false);
+        BT_MBOX_PRINT(2, SNIFF_INTERVAL, false);
+        BT_MBOX_PRINT(2, DISC, false);
+        BT_MBOX_PRINT(2, SCO_TX_ACT, false);
+        BT_MBOX_PRINT(2, SCO_RX_ACT, false);
+        BT_MBOX_PRINT(2, ESCO_RE_TX, false);
+        BT_MBOX_PRINT(2, SCO_DURATION, true);
+
+        pos += scnprintf(buf+pos, bufsz-pos, "MBOX dw3:\n");
+
+        BT_MBOX_PRINT(3, SCO_STATE, false);
+        BT_MBOX_PRINT(3, SNIFF_STATE, false);
+        BT_MBOX_PRINT(3, A2DP_STATE, false);
+        BT_MBOX_PRINT(3, ACL_STATE, false);
+        BT_MBOX_PRINT(3, MSTR_STATE, false);
+        BT_MBOX_PRINT(3, OBX_STATE, false);
+        BT_MBOX_PRINT(3, OPEN_CON_2, false);
+        BT_MBOX_PRINT(3, TRAFFIC_LOAD, false);
+        BT_MBOX_PRINT(3, CHL_SEQN_LSB, false);
+        BT_MBOX_PRINT(3, INBAND_P, false);
+        BT_MBOX_PRINT(3, MSG_TYPE_2, false);
+        BT_MBOX_PRINT(3, SSN_2, false);
+        BT_MBOX_PRINT(3, UPDATE_REQUEST, true);
+
+        pos += scnprintf(buf+pos, bufsz-pos, "bt_status = %d\n",
+                                         notif->bt_status);
+        pos += scnprintf(buf+pos, bufsz-pos, "bt_open_conn = %d\n",
+                                         notif->bt_open_conn);
+        pos += scnprintf(buf+pos, bufsz-pos, "bt_traffic_load = %d\n",
+                                         notif->bt_traffic_load);
+        pos += scnprintf(buf+pos, bufsz-pos, "bt_agg_traffic_load = %d\n",
+                                         notif->bt_agg_traffic_load);
+        pos += scnprintf(buf+pos, bufsz-pos, "bt_ci_compliance = %d\n",
+                                         notif->bt_ci_compliance);
+
+        mutex_unlock(&mvm->mutex);
+
+        ret = simple_read_from_buffer(user_buf, count, ppos, buf, pos);
+        kfree(buf);
+
+        return ret;
+}
+#undef BT_MBOX_PRINT
+
 #define MVM_DEBUGFS_READ_FILE_OPS(name)                                 \
 static const struct file_operations iwl_dbgfs_##name##_ops = {  \
         .read = iwl_dbgfs_##name##_read,                                \
@@ -339,6 +437,7 @@ MVM_DEBUGFS_WRITE_FILE_OPS(tx_flush);
 MVM_DEBUGFS_WRITE_FILE_OPS(sta_drain);
 MVM_DEBUGFS_READ_WRITE_FILE_OPS(sram);
 MVM_DEBUGFS_READ_FILE_OPS(stations);
+MVM_DEBUGFS_READ_FILE_OPS(bt_notif);
 MVM_DEBUGFS_WRITE_FILE_OPS(power_down_allow);
 MVM_DEBUGFS_WRITE_FILE_OPS(power_down_d3_allow);
 
@@ -352,6 +451,7 @@ int iwl_mvm_dbgfs_register(struct iwl_mvm *mvm, struct dentry *dbgfs_dir)
         MVM_DEBUGFS_ADD_FILE(sta_drain, mvm->debugfs_dir, S_IWUSR);
         MVM_DEBUGFS_ADD_FILE(sram, mvm->debugfs_dir, S_IWUSR | S_IRUSR);
         MVM_DEBUGFS_ADD_FILE(stations, dbgfs_dir, S_IRUSR);
+        MVM_DEBUGFS_ADD_FILE(bt_notif, dbgfs_dir, S_IRUSR);
         MVM_DEBUGFS_ADD_FILE(power_down_allow, mvm->debugfs_dir, S_IWUSR);
         MVM_DEBUGFS_ADD_FILE(power_down_d3_allow, mvm->debugfs_dir, S_IWUSR);
 
diff --git a/drivers/net/wireless/iwlwifi/mvm/mvm.h b/drivers/net/wireless/iwlwifi/mvm/mvm.h
index a1f1a86643e5..203eb85e03d3 100644
--- a/drivers/net/wireless/iwlwifi/mvm/mvm.h
+++ b/drivers/net/wireless/iwlwifi/mvm/mvm.h
@@ -337,6 +337,7 @@ struct iwl_mvm {
 
         /* BT-Coex */
         u8 bt_kill_msk;
+        struct iwl_bt_coex_profile_notif last_bt_notif;
 };
 
 /* Extract MVM priv from op_mode and _hw */