diff options
Diffstat (limited to 'drivers/net/wireless/intel/iwlwifi/fw/pnvm.c')
| -rw-r--r-- | drivers/net/wireless/intel/iwlwifi/fw/pnvm.c | 167 |
1 files changed, 143 insertions, 24 deletions
diff --git a/drivers/net/wireless/intel/iwlwifi/fw/pnvm.c b/drivers/net/wireless/intel/iwlwifi/fw/pnvm.c index 6d8f7bff1243..fd070ca5e517 100644 --- a/drivers/net/wireless/intel/iwlwifi/fw/pnvm.c +++ b/drivers/net/wireless/intel/iwlwifi/fw/pnvm.c @@ -1,9 +1,7 @@ // SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause -/****************************************************************************** - * - * Copyright(c) 2020 Intel Corporation - * - *****************************************************************************/ +/* + * Copyright(c) 2020-2021 Intel Corporation + */ #include "iwl-drv.h" #include "pnvm.h" @@ -12,6 +10,7 @@ #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; @@ -198,14 +197,14 @@ static int iwl_pnvm_parse(struct iwl_trans *trans, const u8 *data, 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; - data += sizeof(*tlv) + ALIGN(tlv_len, 4); - len -= ALIGN(tlv_len, 4); - ret = iwl_pnvm_handle_section(trans, data, len); if (!ret) return 0; @@ -221,24 +220,89 @@ static int iwl_pnvm_parse(struct iwl_trans *trans, const u8 *data, return -ENOENT; } -int iwl_pnvm_load(struct iwl_trans *trans, - struct iwl_notif_wait_data *notif_wait) +#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; - struct iwl_notification_wait pnvm_wait; - static const u16 ntf_cmds[] = { WIDE_ID(REGULATORY_AND_NVM_GROUP, - PNVM_INIT_COMPLETE_NTFY) }; char pnvm_name[64]; 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 have it, nothing to do either */ - if (trans->pnvm_loaded) - return 0; - /* * The prefix unfortunately includes a hyphen at the end, so * don't add the dot here... @@ -254,12 +318,67 @@ int iwl_pnvm_load(struct iwl_trans *trans, if (ret) { IWL_DEBUG_FW(trans, "PNVM file %s not found %d\n", pnvm_name, ret); - } else { - iwl_pnvm_parse(trans, pnvm->data, pnvm->size); + return ret; + } - release_firmware(pnvm); + *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); |