iwlwifi: mvm: clean up LDBG config command usage

Clean up the LDBG config command to not be called "continuous
recording", and while at it actually remove the continuous
recording implementation completely since it was only used for
store & forward architectures.

This also fixes a bug at least in iwl_fw_dbg_buffer_allocation()
because what's now "__le32 type" (matching the firmware) used to
be "__le16 enable_recording", so the buffer allocation config
sub-struct would erroneously have started at the wrong offset.
In the other cases this didn't actually lead to a bug as other
bytes in pad[] were all zeroes, so accessing the 16-bit value as
a 32-bit value wouldn't make a difference (in little endian.)
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>

drivers/net/wireless/intel/iwlwifi/fw/api/debug.h

@@ -335,29 +335,11 @@ struct iwl_dbg_mem_access_rsp {
 	__le32 data[];
 } __packed; /* DEBUG_(U|L)MAC_RD_WR_RSP_API_S_VER_1 */
 
-#define CONT_REC_COMMAND_SIZE	80
-#define ENABLE_CONT_RECORDING	0x15
-#define DISABLE_CONT_RECORDING	0x16
+#define LDBG_CFG_COMMAND_SIZE	80
 #define BUFFER_ALLOCATION	0x27
 #define START_DEBUG_RECORDING	0x29
 #define STOP_DEBUG_RECORDING	0x2A
 
-/*
- * struct iwl_continuous_record_mode - recording mode
- */
-struct iwl_continuous_record_mode {
-	__le16 enable_recording;
-} __packed;
-
-/*
- * struct iwl_continuous_record_cmd - enable/disable continuous recording
- */
-struct iwl_continuous_record_cmd {
-	struct iwl_continuous_record_mode record_mode;
-	u8 pad[CONT_REC_COMMAND_SIZE -
-		sizeof(struct iwl_continuous_record_mode)];
-} __packed;
-
 /* maximum fragments to be allocated per target of allocationId */
 #define IWL_BUFFER_LOCATION_MAX_FRAGS	2
 
@@ -385,4 +367,17 @@ struct iwl_buffer_allocation_cmd {
 	struct iwl_fragment_data fragments[IWL_BUFFER_LOCATION_MAX_FRAGS];
 } __packed; /* BUFFER_ALLOCATION_CMD_API_S_VER_1 */
 
+/**
+ * struct iwl_ldbg_config_cmd - LDBG config command
+ * @type: configuration type
+ * @pad: reserved space for type-dependent data
+ */
+struct iwl_ldbg_config_cmd {
+	__le32 type;
+	union {
+		u8 pad[LDBG_CFG_COMMAND_SIZE - sizeof(__le32)];
+		struct iwl_buffer_allocation_cmd buffer_allocation;
+	}; /* LDBG_CFG_BODY_API_U_VER_2 (partially) */
+} __packed; /* LDBG_CFG_CMD_API_S_VER_2 */
+
 #endif /* __iwl_fw_api_debug_h__ */

drivers/net/wireless/intel/iwlwifi/fw/dbg.c

@@ -1678,20 +1678,20 @@ iwl_fw_dbg_buffer_allocation(struct iwl_fw_runtime *fwrt,
 			     struct iwl_fw_ini_allocation_tlv *alloc)
 {
 	struct iwl_trans *trans = fwrt->trans;
-	struct iwl_continuous_record_cmd cont_rec = {};
-	struct iwl_buffer_allocation_cmd *cmd = (void *)&cont_rec.pad[0];
+	struct iwl_ldbg_config_cmd ldbg_cmd = {
+		.type = cpu_to_le32(BUFFER_ALLOCATION),
+	};
+	struct iwl_buffer_allocation_cmd *cmd = &ldbg_cmd.buffer_allocation;
 	struct iwl_host_cmd hcmd = {
 		.id = LDBG_CONFIG_CMD,
 		.flags = CMD_ASYNC,
-		.data[0] = &cont_rec,
-		.len[0] = sizeof(cont_rec),
+		.data[0] = &ldbg_cmd,
+		.len[0] = sizeof(ldbg_cmd),
 	};
 	void *virtual_addr = NULL;
 	u32 size = le32_to_cpu(alloc->size);
 	dma_addr_t phys_addr;
 
-	cont_rec.record_mode.enable_recording = cpu_to_le16(BUFFER_ALLOCATION);
-
 	if (!trans->num_blocks &&
 	    le32_to_cpu(alloc->buffer_location) !=
 	    IWL_FW_INI_LOCATION_DRAM_PATH)

drivers/net/wireless/intel/iwlwifi/fw/dbg.h

@@ -271,18 +271,17 @@ _iwl_fw_dbg_trigger_simple_stop(struct iwl_fw_runtime *fwrt,
 
 static int iwl_fw_dbg_start_stop_hcmd(struct iwl_fw_runtime *fwrt, bool start)
 {
-	struct iwl_continuous_record_cmd cont_rec = {};
+	struct iwl_ldbg_config_cmd cmd = {
+		.type = start ? cpu_to_le32(START_DEBUG_RECORDING) :
+				cpu_to_le32(STOP_DEBUG_RECORDING),
+	};
 	struct iwl_host_cmd hcmd = {
 		.id = LDBG_CONFIG_CMD,
 		.flags = CMD_ASYNC,
-		.data[0] = &cont_rec,
-		.len[0] = sizeof(cont_rec),
+		.data[0] = &cmd,
+		.len[0] = sizeof(cmd),
 	};
 
-	cont_rec.record_mode.enable_recording = start ?
-		cpu_to_le16(START_DEBUG_RECORDING) :
-		cpu_to_le16(STOP_DEBUG_RECORDING);
-
 	return iwl_trans_send_cmd(fwrt->trans, &hcmd);
 }
 

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

@@ -1206,47 +1206,6 @@ static ssize_t iwl_dbgfs_fw_dbg_conf_read(struct file *file,
 	return simple_read_from_buffer(user_buf, count, ppos, buf, pos);
 }
 
-/*
- * Enable / Disable continuous recording.
- * Cause the FW to start continuous recording, by sending the relevant hcmd.
- * Enable: input of every integer larger than 0, ENABLE_CONT_RECORDING.
- * Disable: for 0 as input, DISABLE_CONT_RECORDING.
- */
-static ssize_t iwl_dbgfs_cont_recording_write(struct iwl_mvm *mvm,
-					      char *buf, size_t count,
-					      loff_t *ppos)
-{
-	struct iwl_trans *trans = mvm->trans;
-	const struct iwl_fw_dbg_dest_tlv_v1 *dest = trans->dbg_dest_tlv;
-	struct iwl_continuous_record_cmd cont_rec = {};
-	int ret, rec_mode;
-
-	if (!iwl_mvm_firmware_running(mvm))
-		return -EIO;
-
-	if (!dest)
-		return -EOPNOTSUPP;
-
-	if (dest->monitor_mode != SMEM_MODE ||
-	    trans->cfg->device_family < IWL_DEVICE_FAMILY_8000)
-		return -EOPNOTSUPP;
-
-	ret = kstrtoint(buf, 0, &rec_mode);
-	if (ret)
-		return ret;
-
-	cont_rec.record_mode.enable_recording = rec_mode ?
-		cpu_to_le16(ENABLE_CONT_RECORDING) :
-		cpu_to_le16(DISABLE_CONT_RECORDING);
-
-	mutex_lock(&mvm->mutex);
-	ret = iwl_mvm_send_cmd_pdu(mvm, LDBG_CONFIG_CMD, 0,
-				   sizeof(cont_rec), &cont_rec);
-	mutex_unlock(&mvm->mutex);
-
-	return ret ?: count;
-}
-
 static ssize_t iwl_dbgfs_fw_dbg_conf_write(struct iwl_mvm *mvm,
 					   char *buf, size_t count,
 					   loff_t *ppos)
@@ -1800,7 +1759,6 @@ MVM_DEBUGFS_READ_WRITE_FILE_OPS(scan_ant_rxchain, 8);
 MVM_DEBUGFS_READ_WRITE_FILE_OPS(d0i3_refs, 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(cont_recording, 8);
 MVM_DEBUGFS_WRITE_FILE_OPS(max_amsdu_len, 8);
 MVM_DEBUGFS_WRITE_FILE_OPS(indirection_tbl,
 			   (IWL_RSS_INDIRECTION_TABLE_SIZE * 2));
@@ -2004,7 +1962,6 @@ int iwl_mvm_dbgfs_register(struct iwl_mvm *mvm, struct dentry *dbgfs_dir)
 	MVM_DEBUGFS_ADD_FILE(fw_dbg_collect, mvm->debugfs_dir, 0200);
 	MVM_DEBUGFS_ADD_FILE(max_amsdu_len, mvm->debugfs_dir, 0200);
 	MVM_DEBUGFS_ADD_FILE(send_echo_cmd, mvm->debugfs_dir, 0200);
-	MVM_DEBUGFS_ADD_FILE(cont_recording, mvm->debugfs_dir, 0200);
 	MVM_DEBUGFS_ADD_FILE(indirection_tbl, mvm->debugfs_dir, 0200);
 	MVM_DEBUGFS_ADD_FILE(inject_packet, mvm->debugfs_dir, 0200);
 #ifdef CONFIG_ACPI

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

@@ -737,6 +737,9 @@ iwl_op_mode_mvm_start(struct iwl_trans *trans, const struct iwl_cfg *cfg,
 		trans_cfg.rx_buf_size = rb_size_default;
 	}
 
+	BUILD_BUG_ON(sizeof(struct iwl_ldbg_config_cmd) !=
+		     LDBG_CFG_COMMAND_SIZE);
+
 	trans->wide_cmd_header = true;
 	trans_cfg.bc_table_dword =
 		mvm->trans->cfg->device_family < IWL_DEVICE_FAMILY_22560;