iwlwifi: move UEFI code to a separate file

We are going to read more variables from UEFI, so it's cleaner to have
all the code that handles UEFI variables in a separate file.

Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Link: https://lore.kernel.org/r/iwlwifi.20210621103449.c705ac86f2e9.Ia7421c17fe52929e4098b4f0cf070809ed3ef906@changeid
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>

1 files changed, 64 insertions, 0 deletions

diff --git a/drivers/net/wireless/intel/iwlwifi/fw/uefi.c b/drivers/net/wireless/intel/iwlwifi/fw/uefi.c
new file mode 100644
index 000000000000..bdcdca178eda
--- /dev/null
+++ b/drivers/net/wireless/intel/iwlwifi/fw/uefi.c
@@ -0,0 +1,64 @@
+// 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;
+}