iwlwifi: mvm: add RFI-M support

RF Interference Mitigation is a new feature targeted to handle the
problem of interference between DDR memory and WiFi. The role of
the driver is to configure FW with the table holding a mapping
between problematic channels/bands and the corresponding frequencies.

This patch adds RFI infrastructure and adds two debugfs hooks:
- send RFI configuration command (currently with a default table) which
  will reset feature in the FW
- read the table, used by the FW (which can be a subset of the table
  that driver sent).

Signed-off-by: Gregory Greenman <gregory.greenman@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Link: https://lore.kernel.org/r/iwlwifi.20210210171218.2cea55a09bc7.I634b79795abad499ce442631d6672ffef8fc6d41@changeid
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>

3 files changed, 71 insertions, 0 deletions

diff --git a/drivers/net/wireless/intel/iwlwifi/fw/api/commands.h b/drivers/net/wireless/intel/iwlwifi/fw/api/commands.h
index 8142dcfd8b40..c625d319142e 100644
--- a/drivers/net/wireless/intel/iwlwifi/fw/api/commands.h
+++ b/drivers/net/wireless/intel/iwlwifi/fw/api/commands.h
@@ -606,6 +606,16 @@ enum iwl_system_subcmd_ids {
 	 * @FW_ERROR_RECOVERY_CMD: &struct iwl_fw_error_recovery_cmd
 	 */
 	FW_ERROR_RECOVERY_CMD = 0x7,
+
+	/**
+	 * @RFI_CONFIG_CMD: &struct iwl_rfi_config_cmd
+	 */
+	RFI_CONFIG_CMD = 0xb,
+
+	/**
+	 * @RFI_GET_FREQ_TABLE_CMD: &struct iwl_rfi_config_cmd
+	 */
+	RFI_GET_FREQ_TABLE_CMD = 0xc,
 };
 
 #endif /* __iwl_fw_api_commands_h__ */
diff --git a/drivers/net/wireless/intel/iwlwifi/fw/api/rfi.h b/drivers/net/wireless/intel/iwlwifi/fw/api/rfi.h
new file mode 100644
index 000000000000..c678b9aa9b55
--- /dev/null
+++ b/drivers/net/wireless/intel/iwlwifi/fw/api/rfi.h
@@ -0,0 +1,60 @@
+/* SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause */
+/*
+ * Copyright (C) 2020 Intel Corporation
+ */
+#ifndef __iwl_fw_api_rfi_h__
+#define __iwl_fw_api_rfi_h__
+
+#define IWL_RFI_LUT_ENTRY_CHANNELS_NUM 15
+#define IWL_RFI_LUT_SIZE 24
+#define IWL_RFI_LUT_INSTALLED_SIZE 4
+
+/**
+ * struct iwl_rfi_lut_entry - an entry in the RFI frequency LUT.
+ *
+ * @freq: frequency
+ * @channels: channels that can be interfered at frequency freq (at most 15)
+ * @bands: the corresponding bands
+ */
+struct iwl_rfi_lut_entry {
+	__le16 freq;
+	u8 channels[IWL_RFI_LUT_ENTRY_CHANNELS_NUM];
+	u8 bands[IWL_RFI_LUT_ENTRY_CHANNELS_NUM];
+} __packed;
+
+/**
+ * struct iwl_rfi_config_cmd - RFI configuration table
+ *
+ * @entry: a table can have 24 frequency/channel mappings
+ * @oem: specifies if this is the default table or set by OEM
+ */
+struct iwl_rfi_config_cmd {
+	struct iwl_rfi_lut_entry table[IWL_RFI_LUT_SIZE];
+	u8 oem;
+	u8 reserved[3];
+} __packed; /* RFI_CONFIG_CMD_API_S_VER_1 */
+
+/**
+ * iwl_rfi_freq_table_status - status of the frequency table query
+ * @RFI_FREQ_TABLE_OK: can be used
+ * @RFI_FREQ_TABLE_DVFS_NOT_READY: DVFS is not ready yet, should try later
+ * @RFI_FREQ_TABLE_DISABLED: the feature is disabled in FW
+ */
+enum iwl_rfi_freq_table_status {
+	RFI_FREQ_TABLE_OK,
+	RFI_FREQ_TABLE_DVFS_NOT_READY,
+	RFI_FREQ_TABLE_DISABLED,
+};
+
+/**
+ * struct iwl_rfi_freq_table_resp_cmd - get the rfi freq table used by FW
+ *
+ * @table: table used by FW
+ * @status: see &iwl_rfi_freq_table_status
+ */
+struct iwl_rfi_freq_table_resp_cmd {
+	struct iwl_rfi_lut_entry table[IWL_RFI_LUT_INSTALLED_SIZE];
+	__le32 status;
+} __packed; /* RFI_CONFIG_CMD_API_S_VER_1 */
+
+#endif /* __iwl_fw_api_rfi_h__ */
diff --git a/drivers/net/wireless/intel/iwlwifi/fw/file.h b/drivers/net/wireless/intel/iwlwifi/fw/file.h
index e7068811590b..f2e7b735d211 100644
--- a/drivers/net/wireless/intel/iwlwifi/fw/file.h
+++ b/drivers/net/wireless/intel/iwlwifi/fw/file.h
@@ -441,6 +441,7 @@ enum iwl_ucode_tlv_capa {
 	IWL_UCODE_TLV_CAPA_PSC_CHAN_SUPPORT		= (__force iwl_ucode_tlv_capa_t)98,
 
 	IWL_UCODE_TLV_CAPA_BIGTK_SUPPORT		= (__force iwl_ucode_tlv_capa_t)100,
+	IWL_UCODE_TLV_CAPA_RFIM_SUPPORT			= (__force iwl_ucode_tlv_capa_t)102,
 
 	NUM_IWL_UCODE_TLV_CAPA
 #ifdef __CHECKER__