drivers/net/wireless/intel/iwlwifi/fw/pnvm.c - linux/torvalds/linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
 /*
  * Copyright(c) 2020-2021 Intel Corporation
  */

 #include "iwl-drv.h"
 #include "pnvm.h"
 #include "iwl-prph.h"
 #include "iwl-io.h"
 #include "fw/api/commands.h"
 #include "fw/api/nvm-reg.h"
 #include "fw/api/alive.h"
 #include <linux/efi.h>

 struct iwl_pnvm_section {
 	__le32 offset;
 	const u8 data[];
 } __packed;

 static bool iwl_pnvm_complete_fn(struct iwl_notif_wait_data *notif_wait,
 				 struct iwl_rx_packet *pkt, void *data)
 {
 	struct iwl_trans *trans = (struct iwl_trans *)data;
 	struct iwl_pnvm_init_complete_ntfy *pnvm_ntf = (void *)pkt->data;

 	IWL_DEBUG_FW(trans,
 		     "PNVM complete notification received with status %d\n",
 		     le32_to_cpu(pnvm_ntf->status));

 	return true;
 }

 static int iwl_pnvm_handle_section(struct iwl_trans *trans, const u8 *data,
 				   size_t len)
 {
 	struct iwl_ucode_tlv *tlv;
 	u32 sha1 = 0;
 	u16 mac_type = 0, rf_id = 0;
 	u8 *pnvm_data = NULL, *tmp;
 	u32 size = 0;
 	int ret;

 	IWL_DEBUG_FW(trans, "Handling PNVM section\n");

 	while (len >= sizeof(*tlv)) {
 		u32 tlv_len, tlv_type;

 		len -= sizeof(*tlv);
 		tlv = (void *)data;

 		tlv_len = le32_to_cpu(tlv->length);
 		tlv_type = le32_to_cpu(tlv->type);

 		if (len < tlv_len) {
 			IWL_ERR(trans, "invalid TLV len: %zd/%u\n",
 				len, tlv_len);
 			ret = -EINVAL;
 			goto out;
 		}

 		data += sizeof(*tlv);

 		switch (tlv_type) {
 		case IWL_UCODE_TLV_PNVM_VERSION:
 			if (tlv_len < sizeof(__le32)) {
 				IWL_DEBUG_FW(trans,
 					     "Invalid size for IWL_UCODE_TLV_PNVM_VERSION (expected %zd, got %d)\n",
 					     sizeof(__le32), tlv_len);
 				break;
 			}

 			sha1 = le32_to_cpup((__le32 *)data);

 			IWL_DEBUG_FW(trans,
 				     "Got IWL_UCODE_TLV_PNVM_VERSION %0x\n",
 				     sha1);
 			break;
 		case IWL_UCODE_TLV_HW_TYPE:
 			if (tlv_len < 2 * sizeof(__le16)) {
 				IWL_DEBUG_FW(trans,
 					     "Invalid size for IWL_UCODE_TLV_HW_TYPE (expected %zd, got %d)\n",
 					     2 * sizeof(__le16), tlv_len);
 				break;
 			}

 			mac_type = le16_to_cpup((__le16 *)data);
 			rf_id = le16_to_cpup((__le16 *)(data + sizeof(__le16)));

 			IWL_DEBUG_FW(trans,
 				     "Got IWL_UCODE_TLV_HW_TYPE mac_type 0x%0x rf_id 0x%0x\n",
 				     mac_type, rf_id);

 			if (mac_type != CSR_HW_REV_TYPE(trans->hw_rev) ||
 			    rf_id != CSR_HW_RFID_TYPE(trans->hw_rf_id)) {
 				IWL_DEBUG_FW(trans,
 					     "HW mismatch, skipping PNVM section, mac_type 0x%0x, rf_id 0x%0x.\n",
 					     CSR_HW_REV_TYPE(trans->hw_rev), trans->hw_rf_id);
 				ret = -ENOENT;
 				goto out;
 			}

 			break;
 		case IWL_UCODE_TLV_SEC_RT: {
 			struct iwl_pnvm_section *section = (void *)data;
 			u32 data_len = tlv_len - sizeof(*section);

 			IWL_DEBUG_FW(trans,
 				     "Got IWL_UCODE_TLV_SEC_RT len %d\n",
 				     tlv_len);

 			/* TODO: remove, this is a deprecated separator */
 			if (le32_to_cpup((__le32 *)data) == 0xddddeeee) {
 				IWL_DEBUG_FW(trans, "Ignoring separator.\n");
 				break;
 			}

 			IWL_DEBUG_FW(trans, "Adding data (size %d)\n",
 				     data_len);

 			tmp = krealloc(pnvm_data, size + data_len, GFP_KERNEL);
 			if (!tmp) {
 				IWL_DEBUG_FW(trans,
 					     "Couldn't allocate (more) pnvm_data\n");

 				ret = -ENOMEM;
 				goto out;
 			}

 			pnvm_data = tmp;

 			memcpy(pnvm_data + size, section->data, data_len);

 			size += data_len;

 			break;
 		}
 		case IWL_UCODE_TLV_PNVM_SKU:
 			IWL_DEBUG_FW(trans,
 				     "New PNVM section started, stop parsing.\n");
 			goto done;
 		default:
 			IWL_DEBUG_FW(trans, "Found TLV 0x%0x, len %d\n",
 				     tlv_type, tlv_len);
 			break;
 		}

 		len -= ALIGN(tlv_len, 4);
 		data += ALIGN(tlv_len, 4);
 	}

 done:
 	if (!size) {
 		IWL_DEBUG_FW(trans, "Empty PNVM, skipping.\n");
 		ret = -ENOENT;
 		goto out;
 	}

 	IWL_INFO(trans, "loaded PNVM version 0x%0x\n", sha1);

 	ret = iwl_trans_set_pnvm(trans, pnvm_data, size);
 out:
 	kfree(pnvm_data);
 	return ret;
 }

 static int iwl_pnvm_parse(struct iwl_trans *trans, const u8 *data,
 			  size_t len)
 {
 	struct iwl_ucode_tlv *tlv;

 	IWL_DEBUG_FW(trans, "Parsing PNVM file\n");

 	while (len >= sizeof(*tlv)) {
 		u32 tlv_len, tlv_type;

 		len -= sizeof(*tlv);
 		tlv = (void *)data;

 		tlv_len = le32_to_cpu(tlv->length);
 		tlv_type = le32_to_cpu(tlv->type);

 		if (len < tlv_len) {
 			IWL_ERR(trans, "invalid TLV len: %zd/%u\n",
 				len, tlv_len);
 			return -EINVAL;
 		}

 		if (tlv_type == IWL_UCODE_TLV_PNVM_SKU) {
 			struct iwl_sku_id *sku_id =
 				(void *)(data + sizeof(*tlv));

 			IWL_DEBUG_FW(trans,
 				     "Got IWL_UCODE_TLV_PNVM_SKU len %d\n",
 				     tlv_len);
 			IWL_DEBUG_FW(trans, "sku_id 0x%0x 0x%0x 0x%0x\n",
 				     le32_to_cpu(sku_id->data[0]),
 				     le32_to_cpu(sku_id->data[1]),
 				     le32_to_cpu(sku_id->data[2]));

 			data += sizeof(*tlv) + ALIGN(tlv_len, 4);
 			len -= ALIGN(tlv_len, 4);

 			if (trans->sku_id[0] == le32_to_cpu(sku_id->data[0]) &&
 			    trans->sku_id[1] == le32_to_cpu(sku_id->data[1]) &&
 			    trans->sku_id[2] == le32_to_cpu(sku_id->data[2])) {
 				int ret;

 				ret = iwl_pnvm_handle_section(trans, data, len);
 				if (!ret)
 					return 0;
 			} else {
 				IWL_DEBUG_FW(trans, "SKU ID didn't match!\n");
 			}
 		} else {
 			data += sizeof(*tlv) + ALIGN(tlv_len, 4);
 			len -= ALIGN(tlv_len, 4);
 		}
 	}

 	return -ENOENT;
 }

 #if defined(CONFIG_EFI)

 #define IWL_EFI_VAR_GUID EFI_GUID(0x92daaf2f, 0xc02b, 0x455b,	\
 				  0xb2, 0xec, 0xf5, 0xa3,	\
 				  0x59, 0x4f, 0x4a, 0xea)

 #define IWL_UEFI_OEM_PNVM_NAME	L"UefiCnvWlanOemSignedPnvm"

 #define IWL_HARDCODED_PNVM_SIZE 4096

 struct pnvm_sku_package {
 	u8 rev;
 	u8 reserved1[3];
 	u32 total_size;
 	u8 n_skus;
 	u8 reserved2[11];
 	u8 data[];
 };

 static int iwl_pnvm_get_from_efi(struct iwl_trans *trans,
 				 u8 **data, size_t *len)
 {
 	struct efivar_entry *pnvm_efivar;
 	struct pnvm_sku_package *package;
 	unsigned long package_size;
 	int err;

 	pnvm_efivar = kzalloc(sizeof(*pnvm_efivar), GFP_KERNEL);
 	if (!pnvm_efivar)
 		return -ENOMEM;

 	memcpy(&pnvm_efivar->var.VariableName, IWL_UEFI_OEM_PNVM_NAME,
 	       sizeof(IWL_UEFI_OEM_PNVM_NAME));
 	pnvm_efivar->var.VendorGuid = IWL_EFI_VAR_GUID;

 	/*
 	 * TODO: we hardcode a maximum length here, because reading
 	 * from the UEFI is not working.  To implement this properly,
 	 * we have to call efivar_entry_size().
 	 */
 	package_size = IWL_HARDCODED_PNVM_SIZE;

 	package = kmalloc(package_size, GFP_KERNEL);
 	if (!package) {
 		err = -ENOMEM;
 		goto out;
 	}

 	err = efivar_entry_get(pnvm_efivar, NULL, &package_size, package);
 	if (err) {
 		IWL_DEBUG_FW(trans,
 			     "PNVM UEFI variable not found %d (len %zd)\n",
 			     err, package_size);
 		goto out;
 	}

 	IWL_DEBUG_FW(trans, "Read PNVM fro UEFI with size %zd\n", package_size);

 	*data = kmemdup(package->data, *len, GFP_KERNEL);
 	if (!*data)
 		err = -ENOMEM;
 	*len = package_size - sizeof(*package);

 out:
 	kfree(package);
 	kfree(pnvm_efivar);

 	return err;
 }
 #else /* CONFIG_EFI */
 static inline int iwl_pnvm_get_from_efi(struct iwl_trans *trans,
 					u8 **data, size_t *len)
 {
 	return -EOPNOTSUPP;
 }
 #endif /* CONFIG_EFI */

 static int iwl_pnvm_get_from_fs(struct iwl_trans *trans, u8 **data, size_t *len)
 {
 	const struct firmware *pnvm;
 	char pnvm_name[64];
 	int ret;

 	/*
 	 * The prefix unfortunately includes a hyphen at the end, so
 	 * don't add the dot here...
 	 */
 	snprintf(pnvm_name, sizeof(pnvm_name), "%spnvm",
 		 trans->cfg->fw_name_pre);

 	/* ...but replace the hyphen with the dot here. */
 	if (strlen(trans->cfg->fw_name_pre) < sizeof(pnvm_name))
 		pnvm_name[strlen(trans->cfg->fw_name_pre) - 1] = '.';

 	ret = firmware_request_nowarn(&pnvm, pnvm_name, trans->dev);
 	if (ret) {
 		IWL_DEBUG_FW(trans, "PNVM file %s not found %d\n",
 			     pnvm_name, ret);
 		return ret;
 	}

 	*data = kmemdup(pnvm->data, pnvm->size, GFP_KERNEL);
 	if (!*data)
 		return -ENOMEM;

 	*len = pnvm->size;

 	return 0;
 }

 int iwl_pnvm_load(struct iwl_trans *trans,
 		  struct iwl_notif_wait_data *notif_wait)
 {
 	u8 *data;
 	size_t len;
 	struct iwl_notification_wait pnvm_wait;
 	static const u16 ntf_cmds[] = { WIDE_ID(REGULATORY_AND_NVM_GROUP,
 						PNVM_INIT_COMPLETE_NTFY) };
 	int ret;

 	/* if the SKU_ID is empty, there's nothing to do */
 	if (!trans->sku_id[0] && !trans->sku_id[1] && !trans->sku_id[2])
 		return 0;

 	/*
 	 * If we already loaded (or tried to load) it before, we just
 	 * need to set it again.
 	 */
 	if (trans->pnvm_loaded) {
 		ret = iwl_trans_set_pnvm(trans, NULL, 0);
 		if (ret)
 			return ret;
 		goto skip_parse;
 	}

 	/* First attempt to get the PNVM from BIOS */
 	ret = iwl_pnvm_get_from_efi(trans, &data, &len);
 	if (!ret)
 		goto parse;

 	/* If it's not available, try from the filesystem */
 	ret = iwl_pnvm_get_from_fs(trans, &data, &len);
 	if (ret) {
 		/*
 		 * Pretend we've loaded it - at least we've tried and
 		 * couldn't load it at all, so there's no point in
 		 * trying again over and over.
 		 */
 		trans->pnvm_loaded = true;

 		goto skip_parse;
 	}

 parse:
 	iwl_pnvm_parse(trans, data, len);

 	kfree(data);

 skip_parse:
 	iwl_init_notification_wait(notif_wait, &pnvm_wait,
 				   ntf_cmds, ARRAY_SIZE(ntf_cmds),
 				   iwl_pnvm_complete_fn, trans);

 	/* kick the doorbell */
 	iwl_write_umac_prph(trans, UREG_DOORBELL_TO_ISR6,
 			    UREG_DOORBELL_TO_ISR6_PNVM);

 	return iwl_wait_notification(notif_wait, &pnvm_wait,
 				     MVM_UCODE_PNVM_TIMEOUT);
 }
 IWL_EXPORT_SYMBOL(iwl_pnvm_load);
	// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
	/*
	* Copyright(c) 2020-2021 Intel Corporation
	*/

	#include "iwl-drv.h"
	#include "pnvm.h"
	#include "iwl-prph.h"
	#include "iwl-io.h"
	#include "fw/api/commands.h"
	#include "fw/api/nvm-reg.h"
	#include "fw/api/alive.h"
	#include <linux/efi.h>

	struct iwl_pnvm_section {
	__le32 offset;
	const u8 data[];
	} __packed;

	static bool iwl_pnvm_complete_fn(struct iwl_notif_wait_data *notif_wait,
	struct iwl_rx_packet pkt, void data)
	{
	struct iwl_trans trans = (struct iwl_trans )data;
	struct iwl_pnvm_init_complete_ntfy pnvm_ntf = (void )pkt->data;

	IWL_DEBUG_FW(trans,
	"PNVM complete notification received with status %d\n",
	le32_to_cpu(pnvm_ntf->status));

	return true;
	}

	static int iwl_pnvm_handle_section(struct iwl_trans trans, const u8 data,
	size_t len)
	{
	struct iwl_ucode_tlv *tlv;
	u32 sha1 = 0;
	u16 mac_type = 0, rf_id = 0;
	u8 pnvm_data = NULL, tmp;
	u32 size = 0;
	int ret;

	IWL_DEBUG_FW(trans, "Handling PNVM section\n");

	while (len >= sizeof(*tlv)) {
	u32 tlv_len, tlv_type;

	len -= sizeof(*tlv);
	tlv = (void *)data;

	tlv_len = le32_to_cpu(tlv->length);
	tlv_type = le32_to_cpu(tlv->type);

	if (len < tlv_len) {
	IWL_ERR(trans, "invalid TLV len: %zd/%u\n",
	len, tlv_len);
	ret = -EINVAL;
	goto out;
	}

	data += sizeof(*tlv);

	switch (tlv_type) {
	case IWL_UCODE_TLV_PNVM_VERSION:
	if (tlv_len < sizeof(__le32)) {
	IWL_DEBUG_FW(trans,
	"Invalid size for IWL_UCODE_TLV_PNVM_VERSION (expected %zd, got %d)\n",
	sizeof(__le32), tlv_len);
	break;
	}

	sha1 = le32_to_cpup((__le32 *)data);

	IWL_DEBUG_FW(trans,
	"Got IWL_UCODE_TLV_PNVM_VERSION %0x\n",
	sha1);
	break;
	case IWL_UCODE_TLV_HW_TYPE:
	if (tlv_len < 2 * sizeof(__le16)) {
	IWL_DEBUG_FW(trans,
	"Invalid size for IWL_UCODE_TLV_HW_TYPE (expected %zd, got %d)\n",
	2 * sizeof(__le16), tlv_len);
	break;
	}

	mac_type = le16_to_cpup((__le16 *)data);
	rf_id = le16_to_cpup((__le16 *)(data + sizeof(__le16)));

	IWL_DEBUG_FW(trans,
	"Got IWL_UCODE_TLV_HW_TYPE mac_type 0x%0x rf_id 0x%0x\n",
	mac_type, rf_id);

	if (mac_type != CSR_HW_REV_TYPE(trans->hw_rev) \|\|
	rf_id != CSR_HW_RFID_TYPE(trans->hw_rf_id)) {
	IWL_DEBUG_FW(trans,
	"HW mismatch, skipping PNVM section, mac_type 0x%0x, rf_id 0x%0x.\n",
	CSR_HW_REV_TYPE(trans->hw_rev), trans->hw_rf_id);
	ret = -ENOENT;
	goto out;
	}

	break;
	case IWL_UCODE_TLV_SEC_RT: {
	struct iwl_pnvm_section section = (void )data;
	u32 data_len = tlv_len - sizeof(*section);

	IWL_DEBUG_FW(trans,
	"Got IWL_UCODE_TLV_SEC_RT len %d\n",
	tlv_len);

	/* TODO: remove, this is a deprecated separator */
	if (le32_to_cpup((__le32 *)data) == 0xddddeeee) {
	IWL_DEBUG_FW(trans, "Ignoring separator.\n");
	break;
	}

	IWL_DEBUG_FW(trans, "Adding data (size %d)\n",
	data_len);

	tmp = krealloc(pnvm_data, size + data_len, GFP_KERNEL);
	if (!tmp) {
	IWL_DEBUG_FW(trans,
	"Couldn't allocate (more) pnvm_data\n");

	ret = -ENOMEM;
	goto out;
	}

	pnvm_data = tmp;

	memcpy(pnvm_data + size, section->data, data_len);

	size += data_len;

	break;
	}
	case IWL_UCODE_TLV_PNVM_SKU:
	IWL_DEBUG_FW(trans,
	"New PNVM section started, stop parsing.\n");
	goto done;
	default:
	IWL_DEBUG_FW(trans, "Found TLV 0x%0x, len %d\n",
	tlv_type, tlv_len);
	break;
	}

	len -= ALIGN(tlv_len, 4);
	data += ALIGN(tlv_len, 4);
	}

	done:
	if (!size) {
	IWL_DEBUG_FW(trans, "Empty PNVM, skipping.\n");
	ret = -ENOENT;
	goto out;
	}

	IWL_INFO(trans, "loaded PNVM version 0x%0x\n", sha1);

	ret = iwl_trans_set_pnvm(trans, pnvm_data, size);
	out:
	kfree(pnvm_data);
	return ret;
	}

	static int iwl_pnvm_parse(struct iwl_trans trans, const u8 data,
	size_t len)
	{
	struct iwl_ucode_tlv *tlv;

	IWL_DEBUG_FW(trans, "Parsing PNVM file\n");

	while (len >= sizeof(*tlv)) {
	u32 tlv_len, tlv_type;

	len -= sizeof(*tlv);
	tlv = (void *)data;

	tlv_len = le32_to_cpu(tlv->length);
	tlv_type = le32_to_cpu(tlv->type);

	if (len < tlv_len) {
	IWL_ERR(trans, "invalid TLV len: %zd/%u\n",
	len, tlv_len);
	return -EINVAL;
	}

	if (tlv_type == IWL_UCODE_TLV_PNVM_SKU) {
	struct iwl_sku_id *sku_id =
	(void )(data + sizeof(tlv));

	IWL_DEBUG_FW(trans,
	"Got IWL_UCODE_TLV_PNVM_SKU len %d\n",
	tlv_len);
	IWL_DEBUG_FW(trans, "sku_id 0x%0x 0x%0x 0x%0x\n",
	le32_to_cpu(sku_id->data[0]),
	le32_to_cpu(sku_id->data[1]),
	le32_to_cpu(sku_id->data[2]));

	data += sizeof(*tlv) + ALIGN(tlv_len, 4);
	len -= ALIGN(tlv_len, 4);

	if (trans->sku_id[0] == le32_to_cpu(sku_id->data[0]) &&
	trans->sku_id[1] == le32_to_cpu(sku_id->data[1]) &&
	trans->sku_id[2] == le32_to_cpu(sku_id->data[2])) {
	int ret;

	ret = iwl_pnvm_handle_section(trans, data, len);
	if (!ret)
	return 0;
	} else {
	IWL_DEBUG_FW(trans, "SKU ID didn't match!\n");
	}
	} else {
	data += sizeof(*tlv) + ALIGN(tlv_len, 4);
	len -= ALIGN(tlv_len, 4);
	}
	}

	return -ENOENT;
	}

	#if defined(CONFIG_EFI)

	#define IWL_EFI_VAR_GUID EFI_GUID(0x92daaf2f, 0xc02b, 0x455b, \
	0xb2, 0xec, 0xf5, 0xa3, \
	0x59, 0x4f, 0x4a, 0xea)

	#define IWL_UEFI_OEM_PNVM_NAME L"UefiCnvWlanOemSignedPnvm"

	#define IWL_HARDCODED_PNVM_SIZE 4096

	struct pnvm_sku_package {
	u8 rev;
	u8 reserved1[3];
	u32 total_size;
	u8 n_skus;
	u8 reserved2[11];
	u8 data[];
	};

	static int iwl_pnvm_get_from_efi(struct iwl_trans *trans,
	u8 *data, size_t len)
	{
	struct efivar_entry *pnvm_efivar;
	struct pnvm_sku_package *package;
	unsigned long package_size;
	int err;

	pnvm_efivar = kzalloc(sizeof(*pnvm_efivar), GFP_KERNEL);
	if (!pnvm_efivar)
	return -ENOMEM;

	memcpy(&pnvm_efivar->var.VariableName, IWL_UEFI_OEM_PNVM_NAME,
	sizeof(IWL_UEFI_OEM_PNVM_NAME));
	pnvm_efivar->var.VendorGuid = IWL_EFI_VAR_GUID;

	/*
	* TODO: we hardcode a maximum length here, because reading
	* from the UEFI is not working. To implement this properly,
	* we have to call efivar_entry_size().
	*/
	package_size = IWL_HARDCODED_PNVM_SIZE;

	package = kmalloc(package_size, GFP_KERNEL);
	if (!package) {
	err = -ENOMEM;
	goto out;
	}

	err = efivar_entry_get(pnvm_efivar, NULL, &package_size, package);
	if (err) {
	IWL_DEBUG_FW(trans,
	"PNVM UEFI variable not found %d (len %zd)\n",
	err, package_size);
	goto out;
	}

	IWL_DEBUG_FW(trans, "Read PNVM fro UEFI with size %zd\n", package_size);

	data = kmemdup(package->data, len, GFP_KERNEL);
	if (!*data)
	err = -ENOMEM;
	len = package_size - sizeof(package);

	out:
	kfree(package);
	kfree(pnvm_efivar);

	return err;
	}
	#else /* CONFIG_EFI */
	static inline int iwl_pnvm_get_from_efi(struct iwl_trans *trans,
	u8 *data, size_t len)
	{
	return -EOPNOTSUPP;
	}
	#endif /* CONFIG_EFI */

	static int iwl_pnvm_get_from_fs(struct iwl_trans trans, u8 data, size_t len)
	{
	const struct firmware *pnvm;
	char pnvm_name[64];
	int ret;

	/*
	* The prefix unfortunately includes a hyphen at the end, so
	* don't add the dot here...
	*/
	snprintf(pnvm_name, sizeof(pnvm_name), "%spnvm",
	trans->cfg->fw_name_pre);

	/* ...but replace the hyphen with the dot here. */
	if (strlen(trans->cfg->fw_name_pre) < sizeof(pnvm_name))
	pnvm_name[strlen(trans->cfg->fw_name_pre) - 1] = '.';

	ret = firmware_request_nowarn(&pnvm, pnvm_name, trans->dev);
	if (ret) {
	IWL_DEBUG_FW(trans, "PNVM file %s not found %d\n",
	pnvm_name, ret);
	return ret;
	}

	*data = kmemdup(pnvm->data, pnvm->size, GFP_KERNEL);
	if (!*data)
	return -ENOMEM;

	*len = pnvm->size;

	return 0;
	}

	int iwl_pnvm_load(struct iwl_trans *trans,
	struct iwl_notif_wait_data *notif_wait)
	{
	u8 *data;
	size_t len;
	struct iwl_notification_wait pnvm_wait;
	static const u16 ntf_cmds[] = { WIDE_ID(REGULATORY_AND_NVM_GROUP,
	PNVM_INIT_COMPLETE_NTFY) };
	int ret;

	/* if the SKU_ID is empty, there's nothing to do */
	if (!trans->sku_id[0] && !trans->sku_id[1] && !trans->sku_id[2])
	return 0;

	/*
	* If we already loaded (or tried to load) it before, we just
	* need to set it again.
	*/
	if (trans->pnvm_loaded) {
	ret = iwl_trans_set_pnvm(trans, NULL, 0);
	if (ret)
	return ret;
	goto skip_parse;
	}

	/* First attempt to get the PNVM from BIOS */
	ret = iwl_pnvm_get_from_efi(trans, &data, &len);
	if (!ret)
	goto parse;

	/* If it's not available, try from the filesystem */
	ret = iwl_pnvm_get_from_fs(trans, &data, &len);
	if (ret) {
	/*
	* Pretend we've loaded it - at least we've tried and
	* couldn't load it at all, so there's no point in
	* trying again over and over.
	*/
	trans->pnvm_loaded = true;

	goto skip_parse;
	}

	parse:
	iwl_pnvm_parse(trans, data, len);

	kfree(data);

	skip_parse:
	iwl_init_notification_wait(notif_wait, &pnvm_wait,
	ntf_cmds, ARRAY_SIZE(ntf_cmds),
	iwl_pnvm_complete_fn, trans);

	/* kick the doorbell */
	iwl_write_umac_prph(trans, UREG_DOORBELL_TO_ISR6,
	UREG_DOORBELL_TO_ISR6_PNVM);

	return iwl_wait_notification(notif_wait, &pnvm_wait,
	MVM_UCODE_PNVM_TIMEOUT);
	}
	IWL_EXPORT_SYMBOL(iwl_pnvm_load);