wifi: iwlwifi: mvm: add a debugfs for reading EMLSR blocking reasons

Add a reading for all active EMLSR blocking reasons for testing
purposes.

Signed-off-by: Yedidya Benshimol <yedidya.ben.shimol@intel.com>
Reviewed-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Miri Korenblit <miriam.rachel.korenblit@intel.com>
Link: https://msgid.link/20240506095953.6d494a335e81.Ic0fa6a9636e3c1a3b1420e85e704a19d4a56e8d9@changeid
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

drivers/net/wireless/intel/iwlwifi/mvm/debugfs-vif.c

@@ -722,8 +722,41 @@ static ssize_t iwl_dbgfs_int_mlo_scan_write(struct ieee80211_vif *vif,
 	return ret ?: count;
 }
 
-static ssize_t iwl_dbgfs_block_esr_write(struct ieee80211_vif *vif, char *buf,
-					 size_t count, loff_t *ppos)
+static ssize_t iwl_dbgfs_esr_disable_reason_read(struct file *file,
+						 char __user *user_buf,
+						 size_t count, loff_t *ppos)
+{
+	struct ieee80211_vif *vif = file->private_data;
+	struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
+	struct iwl_mvm *mvm = mvmvif->mvm;
+	unsigned long esr_mask;
+	char *buf;
+	int bufsz, pos, i;
+	ssize_t rv;
+
+	mutex_lock(&mvm->mutex);
+	esr_mask = mvmvif->esr_disable_reason;
+	mutex_unlock(&mvm->mutex);
+
+	bufsz = hweight32(esr_mask) * 32 + 40;
+	buf = kmalloc(bufsz, GFP_KERNEL);
+	if (!buf)
+		return -ENOMEM;
+
+	pos = scnprintf(buf, bufsz, "EMLSR state: '0x%lx'\nreasons:\n",
+			esr_mask);
+	for_each_set_bit(i, &esr_mask, BITS_PER_LONG)
+		pos += scnprintf(buf + pos, bufsz - pos, " - %s\n",
+				 iwl_get_esr_state_string(BIT(i)));
+
+	rv = simple_read_from_buffer(user_buf, count, ppos, buf, pos);
+	kfree(buf);
+	return rv;
+}
+
+static ssize_t iwl_dbgfs_esr_disable_reason_write(struct ieee80211_vif *vif,
+						  char *buf, size_t count,
+						  loff_t *ppos)
 {
 	struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
 	struct iwl_mvm *mvm = mvmvif->mvm;
@@ -769,7 +802,7 @@ MVM_DEBUGFS_READ_WRITE_FILE_OPS(rx_phyinfo, 10);
 MVM_DEBUGFS_READ_WRITE_FILE_OPS(quota_min, 32);
 MVM_DEBUGFS_READ_FILE_OPS(os_device_timediff);
 MVM_DEBUGFS_WRITE_FILE_OPS(int_mlo_scan, 32);
-MVM_DEBUGFS_WRITE_FILE_OPS(block_esr, 32);
+MVM_DEBUGFS_READ_WRITE_FILE_OPS(esr_disable_reason, 32);
 
 void iwl_mvm_vif_add_debugfs(struct ieee80211_hw *hw, struct ieee80211_vif *vif)
 {
@@ -800,7 +833,7 @@ void iwl_mvm_vif_add_debugfs(struct ieee80211_hw *hw, struct ieee80211_vif *vif)
 	debugfs_create_bool("ftm_unprotected", 0200, mvmvif->dbgfs_dir,
 			    &mvmvif->ftm_unprotected);
 	MVM_DEBUGFS_ADD_FILE_VIF(int_mlo_scan, mvmvif->dbgfs_dir, 0200);
-	MVM_DEBUGFS_ADD_FILE_VIF(block_esr, mvmvif->dbgfs_dir, 0600);
+	MVM_DEBUGFS_ADD_FILE_VIF(esr_disable_reason, mvmvif->dbgfs_dir, 0600);
 
 	if (vif->type == NL80211_IFTYPE_STATION && !vif->p2p &&
 	    mvmvif == mvm->bf_allowed_vif)

drivers/net/wireless/intel/iwlwifi/mvm/link.c

@@ -22,7 +22,7 @@ static const char *const iwl_mvm_esr_states_names[] = {
 	HANDLE_ESR_REASONS(NAME_ENTRY)
 };
 
-static const char *iwl_get_esr_state_string(enum iwl_mvm_esr_state state)
+const char *iwl_get_esr_state_string(enum iwl_mvm_esr_state state)
 {
 	int offs = ilog2(state);
 

drivers/net/wireless/intel/iwlwifi/mvm/mvm.h

@@ -385,6 +385,8 @@ enum iwl_mvm_esr_state {
 
 #define IWL_MVM_BLOCK_ESR_REASONS 0xffff
 
+const char *iwl_get_esr_state_string(enum iwl_mvm_esr_state state);
+
 /**
  * struct iwl_mvm_esr_exit - details of the last exit from EMLSR mode.
  * @reason: The reason for the last exit from EMLSR.