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Diffstat (limited to 'drivers/net/wireless/intel/iwlwifi/fw/uefi.c')
-rw-r--r--drivers/net/wireless/intel/iwlwifi/fw/uefi.c324
1 files changed, 324 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 000000000..6d408cd0f
--- /dev/null
+++ b/drivers/net/wireless/intel/iwlwifi/fw/uefi.c
@@ -0,0 +1,324 @@
+// 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>
+#include "fw/runtime.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)
+{
+ void *data;
+ unsigned long package_size;
+ efi_status_t status;
+
+ *len = 0;
+
+ if (!efi_rt_services_supported(EFI_RT_SUPPORTED_GET_VARIABLE))
+ return ERR_PTR(-ENODEV);
+
+ /*
+ * 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)
+ return ERR_PTR(-ENOMEM);
+
+ status = efi.get_variable(IWL_UEFI_OEM_PNVM_NAME, &IWL_EFI_VAR_GUID,
+ NULL, &package_size, data);
+ if (status != EFI_SUCCESS) {
+ IWL_DEBUG_FW(trans,
+ "PNVM UEFI variable not found 0x%lx (len %lu)\n",
+ status, package_size);
+ kfree(data);
+ return ERR_PTR(-ENOENT);
+ }
+
+ IWL_DEBUG_FW(trans, "Read PNVM from UEFI with size %lu\n", package_size);
+ *len = package_size;
+
+ return data;
+}
+
+static void *iwl_uefi_reduce_power_section(struct iwl_trans *trans,
+ const u8 *data, size_t len)
+{
+ const 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 = (const 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);
+ kfree(reduce_power_data);
+ 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");
+
+ kfree(reduce_power_data);
+ 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");
+ /* Better safe than sorry, but 'reduce_power_data' should
+ * always be NULL if !size.
+ */
+ kfree(reduce_power_data);
+ 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)
+{
+ const 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 = (const 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) {
+ const struct iwl_sku_id *sku_id =
+ (const 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 pnvm_sku_package *package;
+ void *data = NULL;
+ unsigned long package_size;
+ efi_status_t status;
+
+ *len = 0;
+
+ if (!efi_rt_services_supported(EFI_RT_SUPPORTED_GET_VARIABLE))
+ return ERR_PTR(-ENODEV);
+
+ /*
+ * 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)
+ return ERR_PTR(-ENOMEM);
+
+ status = efi.get_variable(IWL_UEFI_REDUCED_POWER_NAME, &IWL_EFI_VAR_GUID,
+ NULL, &package_size, data);
+ if (status != EFI_SUCCESS) {
+ IWL_DEBUG_FW(trans,
+ "Reduced Power UEFI variable not found 0x%lx (len %lu)\n",
+ status, package_size);
+ kfree(package);
+ return ERR_PTR(-ENOENT);
+ }
+
+ 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);
+
+ return data;
+}
+
+#ifdef CONFIG_ACPI
+static int iwl_uefi_sgom_parse(struct uefi_cnv_wlan_sgom_data *sgom_data,
+ struct iwl_fw_runtime *fwrt)
+{
+ int i, j;
+
+ if (sgom_data->revision != 1)
+ return -EINVAL;
+
+ memcpy(fwrt->sgom_table.offset_map, sgom_data->offset_map,
+ sizeof(fwrt->sgom_table.offset_map));
+
+ for (i = 0; i < MCC_TO_SAR_OFFSET_TABLE_ROW_SIZE; i++) {
+ for (j = 0; j < MCC_TO_SAR_OFFSET_TABLE_COL_SIZE; j++) {
+ /* since each byte is composed of to values, */
+ /* one for each letter, */
+ /* extract and check each of them separately */
+ u8 value = fwrt->sgom_table.offset_map[i][j];
+ u8 low = value & 0xF;
+ u8 high = (value & 0xF0) >> 4;
+
+ if (high > fwrt->geo_num_profiles)
+ high = 0;
+ if (low > fwrt->geo_num_profiles)
+ low = 0;
+ fwrt->sgom_table.offset_map[i][j] = (high << 4) | low;
+ }
+ }
+
+ fwrt->sgom_enabled = true;
+ return 0;
+}
+
+void iwl_uefi_get_sgom_table(struct iwl_trans *trans,
+ struct iwl_fw_runtime *fwrt)
+{
+ struct uefi_cnv_wlan_sgom_data *data;
+ unsigned long package_size;
+ efi_status_t status;
+ int ret;
+
+ if (!fwrt->geo_enabled ||
+ !efi_rt_services_supported(EFI_RT_SUPPORTED_GET_VARIABLE))
+ return;
+
+ /* 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_SGOM_SIZE;
+
+ data = kmalloc(package_size, GFP_KERNEL);
+ if (!data)
+ return;
+
+ status = efi.get_variable(IWL_UEFI_SGOM_NAME, &IWL_EFI_VAR_GUID,
+ NULL, &package_size, data);
+ if (status != EFI_SUCCESS) {
+ IWL_DEBUG_FW(trans,
+ "SGOM UEFI variable not found 0x%lx\n", status);
+ goto out_free;
+ }
+
+ IWL_DEBUG_FW(trans, "Read SGOM from UEFI with size %lu\n",
+ package_size);
+
+ ret = iwl_uefi_sgom_parse(data, fwrt);
+ if (ret < 0)
+ IWL_DEBUG_FW(trans, "Cannot read SGOM tables. rev is invalid\n");
+
+out_free:
+ kfree(data);
+
+}
+IWL_EXPORT_SYMBOL(iwl_uefi_get_sgom_table);
+#endif /* CONFIG_ACPI */
generated by cgit v1.2.3 (git 2.39.1) at 2024-10-17 20:36:09 +0000