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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 <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;
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);
*len = 0;
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;
}
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