wifi: iwlwifi: read SAR tables from UEFI

All the regulatory tables will be read from UEFI, and
only if it doesn't exist - they will be read from ACPI.
Read SAR tables (WRDS, EWRD and WGDS) from UEFI.
Signed-off-by: Miri Korenblit <miriam.rachel.korenblit@intel.com>
Reviewed-by: Gregory Greenman <gregory.greenman@intel.com>
Link: https://msgid.link/20240131091413.533b687e1efb.Icb316291e593c8d53f41fdea2d083367dc97e3c4@changeidSigned-off-by: Johannes Berg <johannes.berg@intel.com>

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

@@ -622,7 +622,6 @@ int iwl_acpi_get_wrds_table(struct iwl_fw_runtime *fwrt)
 	kfree(data);
 	return ret;
 }
-IWL_EXPORT_SYMBOL(iwl_acpi_get_wrds_table);
 
 int iwl_acpi_get_ewrd_table(struct iwl_fw_runtime *fwrt)
 {
@@ -731,7 +730,6 @@ int iwl_acpi_get_ewrd_table(struct iwl_fw_runtime *fwrt)
 	kfree(data);
 	return ret;
 }
-IWL_EXPORT_SYMBOL(iwl_acpi_get_ewrd_table);
 
 int iwl_acpi_get_wgds_table(struct iwl_fw_runtime *fwrt)
 {
@@ -748,7 +746,7 @@ int iwl_acpi_get_wgds_table(struct iwl_fw_runtime *fwrt)
 			.revisions = BIT(3),
 			.bands = ACPI_GEO_NUM_BANDS_REV2,
 			.profiles = ACPI_NUM_GEO_PROFILES_REV3,
-			.min_profiles = 3,
+			.min_profiles = BIOS_GEO_MIN_PROFILE_NUM,
 		},
 		{
 			.revisions = BIT(2),
@@ -886,7 +884,6 @@ int iwl_acpi_get_wgds_table(struct iwl_fw_runtime *fwrt)
 	kfree(data);
 	return ret;
 }
-IWL_EXPORT_SYMBOL(iwl_acpi_get_wgds_table);
 
 __le32 iwl_acpi_get_lari_config_bitmap(struct iwl_fw_runtime *fwrt)
 {

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

@@ -105,6 +105,9 @@
 #define IWL_SAR_ENABLE_MSK		BIT(0)
 #define IWL_REDUCE_POWER_FLAGS_POS	1
 
+/* The Inidcator whether UEFI WIFI GUID tables are locked is read from ACPI */
+#define UEFI_WIFI_GUID_UNLOCKED		0
+
 /*
  * The profile for revision 2 is a superset of revision 1, which is in
  * turn a superset of revision 0.  So we can store all revisions

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

@@ -6,6 +6,23 @@
 #include "iwl-debug.h"
 #include "regulatory.h"
 #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)	\
+{									\
+	int ret = -ENOENT;						\
+	if (fwrt->uefi_tables_lock_status > UEFI_WIFI_GUID_UNLOCKED)	\
+		ret = iwl_uefi_get_ ## __name ## _table(fwrt);		\
+	if (ret < 0)							\
+		ret = iwl_acpi_get_ ## __name ## _table(fwrt);		\
+	return ret;							\
+}									\
+IWL_EXPORT_SYMBOL(iwl_bios_get_ ## __name ## _table)
+
+IWL_BIOS_TABLE_LOADER(wrds);
+IWL_BIOS_TABLE_LOADER(ewrd);
+IWL_BIOS_TABLE_LOADER(wgds);
 
 bool iwl_sar_geo_support(struct iwl_fw_runtime *fwrt)
 {

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

@@ -87,4 +87,10 @@ int iwl_sar_fill_profile(struct iwl_fw_runtime *fwrt,
 			 __le16 *per_chain, u32 n_tables, u32 n_subbands,
 			 int prof_a, int prof_b);
 
+int iwl_bios_get_wrds_table(struct iwl_fw_runtime *fwrt);
+
+int iwl_bios_get_ewrd_table(struct iwl_fw_runtime *fwrt);
+
+int iwl_bios_get_wgds_table(struct iwl_fw_runtime *fwrt);
+
 #endif /* __fw_regulatory_h__ */

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

@@ -164,21 +164,21 @@ struct iwl_fw_runtime {
 #ifdef CONFIG_IWLWIFI_DEBUGFS
 	bool tpc_enabled;
 #endif /* CONFIG_IWLWIFI_DEBUGFS */
-#ifdef CONFIG_ACPI
 	struct iwl_sar_profile sar_profiles[BIOS_SAR_MAX_PROFILE_NUM];
 	u8 sar_chain_a_profile;
 	u8 sar_chain_b_profile;
+	u8 reduced_power_flags;
 	struct iwl_geo_profile geo_profiles[BIOS_GEO_MAX_PROFILE_NUM];
 	u32 geo_rev;
 	u32 geo_num_profiles;
 	bool geo_enabled;
+#ifdef CONFIG_ACPI
 	struct iwl_ppag_chain ppag_chains[IWL_NUM_CHAIN_LIMITS];
 	u32 ppag_flags;
 	u32 ppag_ver;
 	bool ppag_table_valid;
 	struct iwl_sar_offset_mapping_cmd sgom_table;
 	bool sgom_enabled;
-	u8 reduced_power_flags;
 	struct iwl_uats_table_cmd uats_table;
 	u8 uefi_tables_lock_status;
 #endif

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

@@ -413,3 +413,111 @@ int iwl_uefi_get_uats_table(struct iwl_trans *trans,
 }
 IWL_EXPORT_SYMBOL(iwl_uefi_get_uats_table);
 #endif /* CONFIG_ACPI */
+
+static void iwl_uefi_set_sar_profile(struct iwl_fw_runtime *fwrt,
+				     struct uefi_sar_profile *uefi_sar_prof,
+				     u8 prof_index, bool enabled)
+{
+	memcpy(&fwrt->sar_profiles[prof_index].chains, uefi_sar_prof,
+	       sizeof(struct uefi_sar_profile));
+
+	fwrt->sar_profiles[prof_index].enabled = enabled & IWL_SAR_ENABLE_MSK;
+}
+
+int iwl_uefi_get_wrds_table(struct iwl_fw_runtime *fwrt)
+{
+	struct uefi_cnv_var_wrds *data;
+	int ret = 0;
+
+	data = iwl_uefi_get_verified_variable(fwrt->trans, IWL_UEFI_WRDS_NAME,
+					      "WRDS", sizeof(*data), NULL);
+	if (IS_ERR(data))
+		return -EINVAL;
+
+	if (data->revision != IWL_UEFI_WRDS_REVISION) {
+		ret = -EINVAL;
+		IWL_DEBUG_RADIO(fwrt, "Unsupported UEFI WRDS revision:%d\n",
+				data->revision);
+		goto out;
+	}
+
+	/* The profile from WRDS is officially profile 1, but goes
+	 * into sar_profiles[0] (because we don't have a profile 0).
+	 */
+	iwl_uefi_set_sar_profile(fwrt, &data->sar_profile, 0, data->mode);
+out:
+	kfree(data);
+	return ret;
+}
+
+int iwl_uefi_get_ewrd_table(struct iwl_fw_runtime *fwrt)
+{
+	struct uefi_cnv_var_ewrd *data;
+	int i, ret = 0;
+
+	data = iwl_uefi_get_verified_variable(fwrt->trans, IWL_UEFI_EWRD_NAME,
+					      "EWRD", sizeof(*data), NULL);
+	if (IS_ERR(data))
+		return -EINVAL;
+
+	if (data->revision != IWL_UEFI_EWRD_REVISION) {
+		ret = -EINVAL;
+		IWL_DEBUG_RADIO(fwrt, "Unsupported UEFI EWRD revision:%d\n",
+				data->revision);
+		goto out;
+	}
+
+	if (data->num_profiles >= BIOS_SAR_MAX_PROFILE_NUM) {
+		ret = -EINVAL;
+		goto out;
+	}
+
+	for (i = 0; i < data->num_profiles; i++)
+		/* The EWRD profiles officially go from 2 to 4, but we
+		 * save them in sar_profiles[1-3] (because we don't
+		 * have profile 0).  So in the array we start from 1.
+		 */
+		iwl_uefi_set_sar_profile(fwrt, &data->sar_profiles[i], i + 1,
+					 data->mode);
+
+out:
+	kfree(data);
+	return ret;
+}
+
+int iwl_uefi_get_wgds_table(struct iwl_fw_runtime *fwrt)
+{
+	struct uefi_cnv_var_wgds *data;
+	int i, ret = 0;
+
+	data = iwl_uefi_get_verified_variable(fwrt->trans, IWL_UEFI_WGDS_NAME,
+					      "WGDS", sizeof(*data), NULL);
+	if (IS_ERR(data))
+		return -EINVAL;
+
+	if (data->revision != IWL_UEFI_WGDS_REVISION) {
+		ret = -EINVAL;
+		IWL_DEBUG_RADIO(fwrt, "Unsupported UEFI WGDS revision:%d\n",
+				data->revision);
+		goto out;
+	}
+
+	if (data->num_profiles < BIOS_GEO_MIN_PROFILE_NUM ||
+	    data->num_profiles > BIOS_GEO_MAX_PROFILE_NUM) {
+		ret = -EINVAL;
+		IWL_DEBUG_RADIO(fwrt, "Invalid number of profiles in WGDS: %d\n",
+				data->num_profiles);
+		goto out;
+	}
+
+	fwrt->geo_rev = data->revision;
+	for (i = 0; i < data->num_profiles; i++)
+		memcpy(&fwrt->geo_profiles[i], &data->geo_profiles[i],
+		       sizeof(struct iwl_geo_profile));
+
+	fwrt->geo_num_profiles = data->num_profiles;
+	fwrt->geo_enabled = true;
+out:
+	kfree(data);
+	return ret;
+}

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

@@ -5,15 +5,24 @@
 #ifndef __iwl_fw_uefi__
 #define __iwl_fw_uefi__
 
+#include "fw/regulatory.h"
+
 #define IWL_UEFI_OEM_PNVM_NAME		L"UefiCnvWlanOemSignedPnvm"
 #define IWL_UEFI_REDUCED_POWER_NAME	L"UefiCnvWlanReducedPower"
 #define IWL_UEFI_SGOM_NAME		L"UefiCnvWlanSarGeoOffsetMapping"
 #define IWL_UEFI_STEP_NAME		L"UefiCnvCommonSTEP"
 #define IWL_UEFI_UATS_NAME		L"CnvUefiWlanUATS"
+#define IWL_UEFI_WRDS_NAME		L"UefiCnvWlanWRDS"
+#define IWL_UEFI_EWRD_NAME		L"UefiCnvWlanEWRD"
+#define IWL_UEFI_WGDS_NAME		L"UefiCnvWlanWGDS"
 
 #define IWL_SGOM_MAP_SIZE		339
 #define IWL_UATS_MAP_SIZE		339
 
+#define IWL_UEFI_WRDS_REVISION		2
+#define IWL_UEFI_EWRD_REVISION		2
+#define IWL_UEFI_WGDS_REVISION		3
+
 struct pnvm_sku_package {
 	u8 rev;
 	u32 total_size;
@@ -41,6 +50,55 @@ struct uefi_cnv_common_step_data {
 	u8 radio2;
 } __packed;
 
+/*
+ * struct uefi_sar_profile - a SAR profile as defined in UEFI
+ *
+ * @chains: a per-chain table of SAR values
+ */
+struct uefi_sar_profile {
+	struct iwl_sar_profile_chain chains[BIOS_SAR_MAX_CHAINS_PER_PROFILE];
+} __packed;
+
+/*
+ * struct uefi_cnv_var_wrds - WRDS table as defined in UEFI
+ *
+ * @revision: the revision of the table
+ * @mode: is WRDS enbaled/disabled
+ * @sar_profile: sar profile #1
+ */
+struct uefi_cnv_var_wrds {
+	u8 revision;
+	u32 mode;
+	struct uefi_sar_profile sar_profile;
+} __packed;
+
+/*
+ * struct uefi_cnv_var_ewrd - EWRD table as defined in UEFI
+ * @revision: the revision of the table
+ * @mode: is WRDS enbaled/disabled
+ * @num_profiles: how many additional profiles we have in this table (0-3)
+ * @sar_profiles: the additional SAR profiles (#2-#4)
+ */
+struct uefi_cnv_var_ewrd {
+	u8 revision;
+	u32 mode;
+	u32 num_profiles;
+	struct uefi_sar_profile sar_profiles[BIOS_SAR_MAX_PROFILE_NUM - 1];
+} __packed;
+
+/*
+ * struct uefi_cnv_var_wgds - WGDS table as defined in UEFI
+ * @revision: the revision of the table
+ * @num_profiles: the number of geo profiles we have in the table.
+ *	The first 3 are mandatory, and can have up to 8.
+ * @geo_profiles: a per-profile table of the offsets to add to SAR values.
+ */
+struct uefi_cnv_var_wgds {
+	u8 revision;
+	u8 num_profiles;
+	struct iwl_geo_profile geo_profiles[BIOS_GEO_MAX_PROFILE_NUM];
+} __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
@@ -55,6 +113,9 @@ int iwl_uefi_reduce_power_parse(struct iwl_trans *trans,
 void iwl_uefi_get_step_table(struct iwl_trans *trans);
 int iwl_uefi_handle_tlv_mem_desc(struct iwl_trans *trans, const u8 *data,
 				 u32 tlv_len, struct iwl_pnvm_image *pnvm_data);
+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);
 #else /* CONFIG_EFI */
 static inline void *iwl_uefi_get_pnvm(struct iwl_trans *trans, size_t *len)
 {
@@ -85,6 +146,21 @@ iwl_uefi_handle_tlv_mem_desc(struct iwl_trans *trans, const u8 *data,
 {
 	return 0;
 }
+
+static inline int iwl_uefi_get_wrds_table(struct iwl_fw_runtime *fwrt)
+{
+	return -ENOENT;
+}
+
+static inline int iwl_uefi_get_ewrd_table(struct iwl_fw_runtime *fwrt)
+{
+	return -ENOENT;
+}
+
+static inline int iwl_uefi_get_wgds_table(struct iwl_fw_runtime *fwrt)
+{
+	return -ENOENT;
+}
 #endif /* CONFIG_EFI */
 
 #if defined(CONFIG_EFI) && defined(CONFIG_ACPI)
@@ -103,6 +179,5 @@ int iwl_uefi_get_uats_table(struct iwl_trans *trans,
 {
 	return 0;
 }
-
 #endif
 #endif /* __iwl_fw_uefi__ */

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

@@ -16,6 +16,7 @@
 #include "fw/acpi.h"
 #include "fw/pnvm.h"
 #include "fw/uefi.h"
+#include "fw/regulatory.h"
 
 #include "mvm.h"
 #include "fw/dbg.h"
@@ -895,7 +896,6 @@ static int iwl_mvm_config_ltr(struct iwl_mvm *mvm)
 				    sizeof(cmd), &cmd);
 }
 
-#ifdef CONFIG_ACPI
 int iwl_mvm_sar_select_profile(struct iwl_mvm *mvm, int prof_a, int prof_b)
 {
 	u32 cmd_id = REDUCE_TX_POWER_CMD;
@@ -1078,6 +1078,8 @@ static int iwl_mvm_sar_geo_init(struct iwl_mvm *mvm)
 	return iwl_mvm_send_cmd_pdu(mvm, cmd_id, 0, len, &cmd);
 }
 
+#ifdef CONFIG_ACPI
+
 int iwl_mvm_ppag_send_cmd(struct iwl_mvm *mvm)
 {
 	union iwl_ppag_table_cmd cmd;
@@ -1385,7 +1387,39 @@ static void iwl_mvm_lari_cfg(struct iwl_mvm *mvm)
 		mvm->fwrt.uats_enabled = TRUE;
 }
 
-void iwl_mvm_get_acpi_tables(struct iwl_mvm *mvm)
+#else /* CONFIG_ACPI */
+
+int iwl_mvm_ppag_send_cmd(struct iwl_mvm *mvm)
+{
+	return -ENOENT;
+}
+
+static int iwl_mvm_ppag_init(struct iwl_mvm *mvm)
+{
+	return 0;
+}
+
+static void iwl_mvm_tas_init(struct iwl_mvm *mvm)
+{
+}
+
+static void iwl_mvm_lari_cfg(struct iwl_mvm *mvm)
+{
+}
+
+bool iwl_mvm_is_vendor_in_approved_list(void)
+{
+	return false;
+}
+
+static u8 iwl_mvm_eval_dsm_rfi(struct iwl_mvm *mvm)
+{
+	return DSM_VALUE_RFI_DISABLE;
+}
+
+#endif /* CONFIG_ACPI */
+
+void iwl_mvm_get_bios_tables(struct iwl_mvm *mvm)
 {
 	int ret;
 
@@ -1400,7 +1434,7 @@ void iwl_mvm_get_acpi_tables(struct iwl_mvm *mvm)
 	}
 
 	/* read SAR tables */
-	ret = iwl_acpi_get_wrds_table(&mvm->fwrt);
+	ret = iwl_bios_get_wrds_table(&mvm->fwrt);
 	if (ret < 0) {
 		IWL_DEBUG_RADIO(mvm,
 				"WRDS SAR BIOS table invalid or unavailable. (%d)\n",
@@ -1409,7 +1443,7 @@ void iwl_mvm_get_acpi_tables(struct iwl_mvm *mvm)
 		 * If not available, don't fail and don't bother with EWRD and
 		 * WGDS */
 
-		if (!iwl_acpi_get_wgds_table(&mvm->fwrt)) {
+		if (!iwl_bios_get_wgds_table(&mvm->fwrt)) {
 			/*
 			 * If basic SAR is not available, we check for WGDS,
 			 * which should *not* be available either.  If it is
@@ -1420,7 +1454,7 @@ void iwl_mvm_get_acpi_tables(struct iwl_mvm *mvm)
 		}
 
 	} else {
-		ret = iwl_acpi_get_ewrd_table(&mvm->fwrt);
+		ret = iwl_bios_get_ewrd_table(&mvm->fwrt);
 		/* if EWRD is not available, we can still use
 		* WRDS, so don't fail */
 		if (ret < 0)
@@ -1430,7 +1464,7 @@ void iwl_mvm_get_acpi_tables(struct iwl_mvm *mvm)
 
 		/* read geo SAR table */
 		if (iwl_sar_geo_support(&mvm->fwrt)) {
-			ret = iwl_acpi_get_wgds_table(&mvm->fwrt);
+			ret = iwl_bios_get_wgds_table(&mvm->fwrt);
 			if (ret < 0)
 				IWL_DEBUG_RADIO(mvm,
 						"Geo SAR BIOS table invalid or unavailable. (%d)\n",
@@ -1441,57 +1475,6 @@ void iwl_mvm_get_acpi_tables(struct iwl_mvm *mvm)
 
 	iwl_acpi_get_phy_filters(&mvm->fwrt, &mvm->phy_filters);
 }
-#else /* CONFIG_ACPI */
-
-inline int iwl_mvm_sar_select_profile(struct iwl_mvm *mvm,
-				      int prof_a, int prof_b)
-{
-	return 1;
-}
-
-inline int iwl_mvm_get_sar_geo_profile(struct iwl_mvm *mvm)
-{
-	return -ENOENT;
-}
-
-static int iwl_mvm_sar_geo_init(struct iwl_mvm *mvm)
-{
-	return 0;
-}
-
-int iwl_mvm_ppag_send_cmd(struct iwl_mvm *mvm)
-{
-	return -ENOENT;
-}
-
-static int iwl_mvm_ppag_init(struct iwl_mvm *mvm)
-{
-	return 0;
-}
-
-static void iwl_mvm_tas_init(struct iwl_mvm *mvm)
-{
-}
-
-static void iwl_mvm_lari_cfg(struct iwl_mvm *mvm)
-{
-}
-
-bool iwl_mvm_is_vendor_in_approved_list(void)
-{
-	return false;
-}
-
-static u8 iwl_mvm_eval_dsm_rfi(struct iwl_mvm *mvm)
-{
-	return DSM_VALUE_RFI_DISABLE;
-}
-
-void iwl_mvm_get_acpi_tables(struct iwl_mvm *mvm)
-{
-}
-
-#endif /* CONFIG_ACPI */
 
 static void iwl_mvm_disconnect_iterator(void *data, u8 *mac,
 					struct ieee80211_vif *vif)

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

@@ -2381,7 +2381,7 @@ u64 iwl_mvm_ptp_get_adj_time(struct iwl_mvm *mvm, u64 base_time);
 int iwl_mvm_sar_select_profile(struct iwl_mvm *mvm, int prof_a, int prof_b);
 int iwl_mvm_get_sar_geo_profile(struct iwl_mvm *mvm);
 int iwl_mvm_ppag_send_cmd(struct iwl_mvm *mvm);
-void iwl_mvm_get_acpi_tables(struct iwl_mvm *mvm);
+void iwl_mvm_get_bios_tables(struct iwl_mvm *mvm);
 #ifdef CONFIG_IWLWIFI_DEBUGFS
 void iwl_mvm_link_sta_add_debugfs(struct ieee80211_hw *hw,
 				  struct ieee80211_vif *vif,

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

@@ -1201,7 +1201,7 @@ iwl_op_mode_mvm_start(struct iwl_trans *trans, const struct iwl_cfg *cfg,
 	iwl_fw_runtime_init(&mvm->fwrt, trans, fw, &iwl_mvm_fwrt_ops, mvm,
 			    &iwl_mvm_sanitize_ops, mvm, dbgfs_dir);
 
-	iwl_mvm_get_acpi_tables(mvm);
+	iwl_mvm_get_bios_tables(mvm);
 	iwl_uefi_get_sgom_table(trans, &mvm->fwrt);
 	iwl_uefi_get_step_table(trans);