| // SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause |
| /* |
| * Copyright(c) 2021 Intel Corporation |
| */ |
| |
| #include "iwl-drv.h" |
| #include "pnvm.h" |
| #include "iwl-prph.h" |
| #include "iwl-io.h" |
| |
| #include "fw/uefi.h" |
| #include "fw/api/alive.h" |
| #include <linux/efi.h> |
| |
| #define IWL_EFI_VAR_GUID EFI_GUID(0x92daaf2f, 0xc02b, 0x455b, \ |
| 0xb2, 0xec, 0xf5, 0xa3, \ |
| 0x59, 0x4f, 0x4a, 0xea) |
| |
| void *iwl_uefi_get_pnvm(struct iwl_trans *trans, size_t *len) |
| { |
| struct efivar_entry *pnvm_efivar; |
| void *data; |
| unsigned long package_size; |
| int err; |
| |
| *len = 0; |
| |
| pnvm_efivar = kzalloc(sizeof(*pnvm_efivar), GFP_KERNEL); |
| if (!pnvm_efivar) |
| return ERR_PTR(-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; |
| |
| data = kmalloc(package_size, GFP_KERNEL); |
| if (!data) { |
| data = ERR_PTR(-ENOMEM); |
| goto out; |
| } |
| |
| err = efivar_entry_get(pnvm_efivar, NULL, &package_size, data); |
| if (err) { |
| IWL_DEBUG_FW(trans, |
| "PNVM UEFI variable not found %d (len %lu)\n", |
| err, package_size); |
| kfree(data); |
| data = ERR_PTR(err); |
| goto out; |
| } |
| |
| IWL_DEBUG_FW(trans, "Read PNVM from UEFI with size %lu\n", package_size); |
| *len = package_size; |
| |
| out: |
| kfree(pnvm_efivar); |
| |
| return data; |
| } |
| |
| static void *iwl_uefi_reduce_power_section(struct iwl_trans *trans, |
| const u8 *data, size_t len) |
| { |
| struct iwl_ucode_tlv *tlv; |
| u8 *reduce_power_data = NULL, *tmp; |
| u32 size = 0; |
| |
| IWL_DEBUG_FW(trans, "Handling REDUCE_POWER 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); |
| reduce_power_data = ERR_PTR(-EINVAL); |
| goto out; |
| } |
| |
| data += sizeof(*tlv); |
| |
| switch (tlv_type) { |
| case IWL_UCODE_TLV_MEM_DESC: { |
| IWL_DEBUG_FW(trans, |
| "Got IWL_UCODE_TLV_MEM_DESC len %d\n", |
| tlv_len); |
| |
| IWL_DEBUG_FW(trans, "Adding data (size %d)\n", tlv_len); |
| |
| tmp = krealloc(reduce_power_data, size + tlv_len, GFP_KERNEL); |
| if (!tmp) { |
| IWL_DEBUG_FW(trans, |
| "Couldn't allocate (more) reduce_power_data\n"); |
| |
| reduce_power_data = ERR_PTR(-ENOMEM); |
| goto out; |
| } |
| |
| reduce_power_data = tmp; |
| |
| memcpy(reduce_power_data + size, data, tlv_len); |
| |
| size += tlv_len; |
| |
| break; |
| } |
| case IWL_UCODE_TLV_PNVM_SKU: |
| IWL_DEBUG_FW(trans, |
| "New REDUCE_POWER 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 REDUCE_POWER, skipping.\n"); |
| reduce_power_data = ERR_PTR(-ENOENT); |
| goto out; |
| } |
| |
| IWL_INFO(trans, "loaded REDUCE_POWER\n"); |
| |
| out: |
| return reduce_power_data; |
| } |
| |
| static void *iwl_uefi_reduce_power_parse(struct iwl_trans *trans, |
| const u8 *data, size_t len) |
| { |
| struct iwl_ucode_tlv *tlv; |
| void *sec_data; |
| |
| IWL_DEBUG_FW(trans, "Parsing REDUCE_POWER data\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 ERR_PTR(-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])) { |
| sec_data = iwl_uefi_reduce_power_section(trans, |
| data, |
| len); |
| if (!IS_ERR(sec_data)) |
| return sec_data; |
| } 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 ERR_PTR(-ENOENT); |
| } |
| |
| void *iwl_uefi_get_reduced_power(struct iwl_trans *trans, size_t *len) |
| { |
| struct efivar_entry *reduce_power_efivar; |
| struct pnvm_sku_package *package; |
| void *data = NULL; |
| unsigned long package_size; |
| int err; |
| |
| *len = 0; |
| |
| reduce_power_efivar = kzalloc(sizeof(*reduce_power_efivar), GFP_KERNEL); |
| if (!reduce_power_efivar) |
| return ERR_PTR(-ENOMEM); |
| |
| memcpy(&reduce_power_efivar->var.VariableName, IWL_UEFI_REDUCED_POWER_NAME, |
| sizeof(IWL_UEFI_REDUCED_POWER_NAME)); |
| reduce_power_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_REDUCE_POWER_SIZE; |
| |
| package = kmalloc(package_size, GFP_KERNEL); |
| if (!package) { |
| package = ERR_PTR(-ENOMEM); |
| goto out; |
| } |
| |
| err = efivar_entry_get(reduce_power_efivar, NULL, &package_size, package); |
| if (err) { |
| IWL_DEBUG_FW(trans, |
| "Reduced Power UEFI variable not found %d (len %lu)\n", |
| err, package_size); |
| kfree(package); |
| data = ERR_PTR(err); |
| goto out; |
| } |
| |
| IWL_DEBUG_FW(trans, "Read reduced power from UEFI with size %lu\n", |
| package_size); |
| *len = package_size; |
| |
| IWL_DEBUG_FW(trans, "rev %d, total_size %d, n_skus %d\n", |
| package->rev, package->total_size, package->n_skus); |
| |
| data = iwl_uefi_reduce_power_parse(trans, package->data, |
| *len - sizeof(*package)); |
| |
| kfree(package); |
| |
| out: |
| kfree(reduce_power_efivar); |
| |
| return data; |
| } |