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// 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 %zd)\n",
err, package_size);
kfree(data);
data = ERR_PTR(err);
goto out;
}
IWL_DEBUG_FW(trans, "Read PNVM from UEFI with size %zd\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;
}
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