wifi: iwlwifi: read WTAS table from UEFI

Try to read the WTAS table from UEFI first,
and if the WIFI UEFI tables are unlocked or the
table doesn't exist - try to read it from ACPI.
Signed-off-by: Miri Korenblit <miriam.rachel.korenblit@intel.com>
Reviewed-by: Gregory Greenman <gregory.greenman@intel.com>
Link: https://msgid.link/20240131091413.45e6ff7b5063.Id3aec70887e14533b10d564f32c0cf5f2a14b792@changeid
[move uefi_tables_lock_status outside ifdef to fix build errors]
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

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

@@ -249,8 +249,7 @@ iwl_acpi_get_wifi_pkg(struct device *dev,
 					   tbl_rev);
 }
 
-
-int iwl_acpi_get_tas(struct iwl_fw_runtime *fwrt,
+int iwl_acpi_get_tas_table(struct iwl_fw_runtime *fwrt,
 			   struct iwl_tas_data *tas_data)
 {
 	union acpi_object *wifi_pkg, *data;
@@ -326,7 +325,6 @@ int iwl_acpi_get_tas(struct iwl_fw_runtime *fwrt,
 	kfree(data);
 	return ret;
 }
-IWL_EXPORT_SYMBOL(iwl_acpi_get_tas);
 
 int iwl_acpi_get_mcc(struct device *dev, char *mcc)
 {

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

@@ -175,7 +175,7 @@ int iwl_acpi_get_ewrd_table(struct iwl_fw_runtime *fwrt);
 
 int iwl_acpi_get_wgds_table(struct iwl_fw_runtime *fwrt);
 
-int iwl_acpi_get_tas(struct iwl_fw_runtime *fwrt,
+int iwl_acpi_get_tas_table(struct iwl_fw_runtime *fwrt,
 			   struct iwl_tas_data *data);
 
 __le32 iwl_acpi_get_lari_config_bitmap(struct iwl_fw_runtime *fwrt);
@@ -237,7 +237,7 @@ static inline int iwl_acpi_get_wgds_table(struct iwl_fw_runtime *fwrt)
 	return 1;
 }
 
-static inline int iwl_acpi_get_tas(struct iwl_fw_runtime *fwrt,
+static inline int iwl_acpi_get_tas_table(struct iwl_fw_runtime *fwrt,
 					 struct iwl_tas_data *data)
 {
 	return -ENOENT;

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

@@ -9,22 +9,32 @@
 #include "fw/runtime.h"
 #include "fw/uefi.h"
 
-#define IWL_BIOS_TABLE_LOADER(__name)					\
-int iwl_bios_get_ ## __name ## _table(struct iwl_fw_runtime *fwrt)	\
-{									\
+#define GET_BIOS_TABLE(__name, ...)					\
+do {									\
 	int ret = -ENOENT;						\
 	if (fwrt->uefi_tables_lock_status > UEFI_WIFI_GUID_UNLOCKED)	\
-		ret = iwl_uefi_get_ ## __name ## _table(fwrt);		\
+		ret = iwl_uefi_get_ ## __name(__VA_ARGS__);		\
 	if (ret < 0)							\
-		ret = iwl_acpi_get_ ## __name ## _table(fwrt);		\
+		ret = iwl_acpi_get_ ## __name(__VA_ARGS__);		\
 	return ret;							\
-}									\
-IWL_EXPORT_SYMBOL(iwl_bios_get_ ## __name ## _table)
+} while (0)
 
-IWL_BIOS_TABLE_LOADER(wrds);
-IWL_BIOS_TABLE_LOADER(ewrd);
-IWL_BIOS_TABLE_LOADER(wgds);
-IWL_BIOS_TABLE_LOADER(ppag);
+#define IWL_BIOS_TABLE_LOADER(__name)					\
+int iwl_bios_get_ ## __name(struct iwl_fw_runtime *fwrt)		\
+{GET_BIOS_TABLE(__name, fwrt); }					\
+IWL_EXPORT_SYMBOL(iwl_bios_get_ ## __name)
+
+#define IWL_BIOS_TABLE_LOADER_DATA(__name, data_type)			\
+int iwl_bios_get_ ## __name(struct iwl_fw_runtime *fwrt,		\
+			    data_type * data)				\
+{GET_BIOS_TABLE(__name, fwrt, data); }					\
+IWL_EXPORT_SYMBOL(iwl_bios_get_ ## __name)
+
+IWL_BIOS_TABLE_LOADER(wrds_table);
+IWL_BIOS_TABLE_LOADER(ewrd_table);
+IWL_BIOS_TABLE_LOADER(wgds_table);
+IWL_BIOS_TABLE_LOADER(ppag_table);
+IWL_BIOS_TABLE_LOADER_DATA(tas_table, struct iwl_tas_data);
 
 static const struct dmi_system_id dmi_ppag_approved_list[] = {
 	{ .ident = "HP",

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

@@ -133,4 +133,8 @@ int iwl_bios_get_ewrd_table(struct iwl_fw_runtime *fwrt);
 int iwl_bios_get_wgds_table(struct iwl_fw_runtime *fwrt);
 
 int iwl_bios_get_ppag_table(struct iwl_fw_runtime *fwrt);
+
+int iwl_bios_get_tas_table(struct iwl_fw_runtime *fwrt,
+			   struct iwl_tas_data *data);
+
 #endif /* __fw_regulatory_h__ */

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

@@ -179,8 +179,8 @@ struct iwl_fw_runtime {
 	struct iwl_sar_offset_mapping_cmd sgom_table;
 	bool sgom_enabled;
 	struct iwl_uats_table_cmd uats_table;
-	u8 uefi_tables_lock_status;
 #endif
+	u8 uefi_tables_lock_status;
 	bool uats_enabled;
 };
 

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

@@ -550,3 +550,51 @@ int iwl_uefi_get_ppag_table(struct iwl_fw_runtime *fwrt)
 	kfree(data);
 	return ret;
 }
+
+int iwl_uefi_get_tas_table(struct iwl_fw_runtime *fwrt,
+			   struct iwl_tas_data *tas_data)
+{
+	struct uefi_cnv_var_wtas *uefi_tas;
+	int ret = 0, enabled, i;
+
+	uefi_tas = iwl_uefi_get_verified_variable(fwrt->trans, IWL_UEFI_WTAS_NAME,
+						  "WTAS", sizeof(*uefi_tas), NULL);
+	if (IS_ERR(uefi_tas))
+		return -EINVAL;
+
+	if (uefi_tas->revision != IWL_UEFI_WTAS_REVISION) {
+		ret = -EINVAL;
+		IWL_DEBUG_RADIO(fwrt, "Unsupported UEFI WTAS revision:%d\n",
+				uefi_tas->revision);
+		goto out;
+	}
+
+	enabled = iwl_parse_tas_selection(fwrt, tas_data,
+					  uefi_tas->tas_selection);
+	if (!enabled) {
+		IWL_DEBUG_RADIO(fwrt, "TAS not enabled\n");
+		ret = 0;
+		goto out;
+	}
+
+	IWL_DEBUG_RADIO(fwrt, "Reading TAS table revision %d\n",
+			uefi_tas->revision);
+	if (uefi_tas->black_list_size > IWL_WTAS_BLACK_LIST_MAX) {
+		IWL_DEBUG_RADIO(fwrt, "TAS invalid array size %d\n",
+				uefi_tas->black_list_size);
+		ret = -EINVAL;
+		goto out;
+	}
+	tas_data->block_list_size = cpu_to_le32(uefi_tas->black_list_size);
+	IWL_DEBUG_RADIO(fwrt, "TAS array size %u\n", uefi_tas->black_list_size);
+
+	for (i = 0; i < uefi_tas->black_list_size; i++) {
+		tas_data->block_list_array[i] =
+			cpu_to_le32(uefi_tas->black_list[i]);
+		IWL_DEBUG_RADIO(fwrt, "TAS block list country %d\n",
+				uefi_tas->black_list[i]);
+	}
+out:
+	kfree(uefi_tas);
+	return ret;
+}

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

@@ -16,6 +16,7 @@
 #define IWL_UEFI_EWRD_NAME		L"UefiCnvWlanEWRD"
 #define IWL_UEFI_WGDS_NAME		L"UefiCnvWlanWGDS"
 #define IWL_UEFI_PPAG_NAME		L"UefiCnvWlanPPAG"
+#define IWL_UEFI_WTAS_NAME		L"UefiCnvWlanWTAS"
 
 #define IWL_SGOM_MAP_SIZE		339
 #define IWL_UATS_MAP_SIZE		339
@@ -25,6 +26,7 @@
 #define IWL_UEFI_WGDS_REVISION		3
 #define IWL_UEFI_MIN_PPAG_REV		1
 #define IWL_UEFI_MAX_PPAG_REV		3
+#define IWL_UEFI_WTAS_REVISION		1
 
 struct pnvm_sku_package {
 	u8 rev;
@@ -115,6 +117,19 @@ struct uefi_cnv_var_ppag {
 	struct iwl_ppag_chain ppag_chains[IWL_NUM_CHAIN_LIMITS];
 } __packed;
 
+/* struct uefi_cnv_var_wtas - WTAS tabled as defined in UEFI
+ * @revision: the revision of the table
+ * @tas_selection: different options of TAS enablement.
+ * @black_list_size: the number of defined entried in the black list
+ * @black_list: a list of countries that are not allowed to use the TAS feature
+ */
+struct uefi_cnv_var_wtas {
+	u8 revision;
+	u32 tas_selection;
+	u8 black_list_size;
+	u16 black_list[IWL_WTAS_BLACK_LIST_MAX];
+} __packed;
+
 /*
  * This is known to be broken on v4.19 and to work on v5.4.  Until we
  * figure out why this is the case and how to make it work, simply
@@ -133,6 +148,8 @@ int iwl_uefi_get_wrds_table(struct iwl_fw_runtime *fwrt);
 int iwl_uefi_get_ewrd_table(struct iwl_fw_runtime *fwrt);
 int iwl_uefi_get_wgds_table(struct iwl_fw_runtime *fwrt);
 int iwl_uefi_get_ppag_table(struct iwl_fw_runtime *fwrt);
+int iwl_uefi_get_tas_table(struct iwl_fw_runtime *fwrt,
+			   struct iwl_tas_data *data);
 #else /* CONFIG_EFI */
 static inline void *iwl_uefi_get_pnvm(struct iwl_trans *trans, size_t *len)
 {
@@ -183,6 +200,12 @@ static inline int iwl_uefi_get_ppag_table(struct iwl_fw_runtime *fwrt)
 {
 	return -ENOENT;
 }
+
+static inline int iwl_uefi_get_tas_table(struct iwl_fw_runtime *fwrt,
+					 struct iwl_tas_data *data)
+{
+	return -ENOENT;
+}
 #endif /* CONFIG_EFI */
 
 #if defined(CONFIG_EFI) && defined(CONFIG_ACPI)

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

@@ -1108,10 +1108,6 @@ static int iwl_mvm_ppag_init(struct iwl_mvm *mvm)
 	return iwl_mvm_ppag_send_cmd(mvm);
 }
 
-#ifdef CONFIG_ACPI
-
-
-
 static bool iwl_mvm_add_to_tas_block_list(__le32 *list, __le32 *le_size, unsigned int mcc)
 {
 	int i;
@@ -1149,7 +1145,7 @@ static void iwl_mvm_tas_init(struct iwl_mvm *mvm)
 		return;
 	}
 
-	ret = iwl_acpi_get_tas(&mvm->fwrt, &data);
+	ret = iwl_bios_get_tas_table(&mvm->fwrt, &data);
 	if (ret < 0) {
 		IWL_DEBUG_RADIO(mvm,
 				"TAS table invalid or unavailable. (%d)\n",
@@ -1205,6 +1201,8 @@ static void iwl_mvm_tas_init(struct iwl_mvm *mvm)
 		IWL_DEBUG_RADIO(mvm, "failed to send TAS_CONFIG (%d)\n", ret);
 }
 
+#ifdef CONFIG_ACPI
+
 static u8 iwl_mvm_eval_dsm_rfi(struct iwl_mvm *mvm)
 {
 	u8 value;
@@ -1345,10 +1343,6 @@ static void iwl_mvm_lari_cfg(struct iwl_mvm *mvm)
 
 #else /* CONFIG_ACPI */
 
-static void iwl_mvm_tas_init(struct iwl_mvm *mvm)
-{
-}
-
 static void iwl_mvm_lari_cfg(struct iwl_mvm *mvm)
 {
 }