--- /dev/null
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (c) 2022, Linaro Limited
+ */
+
+#define LOG_CATEGORY UCLASS_FWU_MDATA
+
+#include <blk.h>
+#include <dm.h>
+#include <efi_loader.h>
+#include <fwu.h>
+#include <fwu_mdata.h>
+#include <log.h>
+#include <memalign.h>
+#include <part.h>
+#include <part_efi.h>
+
+#include <dm/device-internal.h>
+#include <linux/errno.h>
+#include <linux/types.h>
+
+enum {
+ MDATA_READ = 1,
+ MDATA_WRITE,
+};
+
+static int gpt_get_mdata_partitions(struct blk_desc *desc,
+ uint mdata_parts[2])
+{
+ int i, ret;
+ u32 nparts;
+ efi_guid_t part_type_guid;
+ struct disk_partition info;
+ const efi_guid_t fwu_mdata_guid = FWU_MDATA_GUID;
+
+ nparts = 0;
+ for (i = 1; i < MAX_SEARCH_PARTITIONS; i++) {
+ if (part_get_info(desc, i, &info))
+ continue;
+ uuid_str_to_bin(info.type_guid, part_type_guid.b,
+ UUID_STR_FORMAT_GUID);
+
+ if (!guidcmp(&fwu_mdata_guid, &part_type_guid)) {
+ if (nparts < 2)
+ mdata_parts[nparts] = i;
+ ++nparts;
+ }
+ }
+
+ if (nparts != 2) {
+ log_debug("Expect two copies of the FWU metadata instead of %d\n",
+ nparts);
+ ret = -EINVAL;
+ } else {
+ ret = 0;
+ }
+
+ return ret;
+}
+
+static int gpt_get_mdata_disk_part(struct blk_desc *desc,
+ struct disk_partition *info,
+ u32 part_num)
+{
+ int ret;
+ char *mdata_guid_str = "8a7a84a0-8387-40f6-ab41-a8b9a5a60d23";
+
+ ret = part_get_info(desc, part_num, info);
+ if (ret < 0) {
+ log_debug("Unable to get the partition info for the FWU metadata part %d\n",
+ part_num);
+ return -ENOENT;
+ }
+
+ /* Check that it is indeed the FWU metadata partition */
+ if (!strncmp(info->type_guid, mdata_guid_str, UUID_STR_LEN))
+ return 0;
+
+ return -ENOENT;
+}
+
+static int gpt_read_write_mdata(struct blk_desc *desc,
+ struct fwu_mdata *mdata,
+ u8 access, u32 part_num)
+{
+ int ret;
+ u32 len, blk_start, blkcnt;
+ struct disk_partition info;
+
+ ALLOC_CACHE_ALIGN_BUFFER_PAD(struct fwu_mdata, mdata_aligned, 1,
+ desc->blksz);
+
+ if (!mdata)
+ return -ENOMEM;
+
+ ret = gpt_get_mdata_disk_part(desc, &info, part_num);
+ if (ret < 0) {
+ printf("Unable to get the FWU metadata partition\n");
+ return -ENOENT;
+ }
+
+ len = sizeof(*mdata);
+ blkcnt = BLOCK_CNT(len, desc);
+ if (blkcnt > info.size) {
+ log_debug("Block count exceeds FWU metadata partition size\n");
+ return -ERANGE;
+ }
+
+ blk_start = info.start;
+ if (access == MDATA_READ) {
+ if (blk_dread(desc, blk_start, blkcnt, mdata_aligned) != blkcnt) {
+ log_debug("Error reading FWU metadata from the device\n");
+ return -EIO;
+ }
+ memcpy(mdata, mdata_aligned, sizeof(struct fwu_mdata));
+ } else {
+ if (blk_dwrite(desc, blk_start, blkcnt, mdata) != blkcnt) {
+ log_debug("Error writing FWU metadata to the device\n");
+ return -EIO;
+ }
+ }
+
+ return 0;
+}
+
+static int fwu_gpt_update_mdata(struct udevice *dev, struct fwu_mdata *mdata)
+{
+ int ret;
+ struct blk_desc *desc;
+ uint mdata_parts[2];
+ struct fwu_mdata_gpt_blk_priv *priv = dev_get_priv(dev);
+
+ desc = dev_get_uclass_plat(priv->blk_dev);
+
+ ret = gpt_get_mdata_partitions(desc, mdata_parts);
+ if (ret < 0) {
+ log_debug("Error getting the FWU metadata partitions\n");
+ return -ENOENT;
+ }
+
+ /* First write the primary partition */
+ ret = gpt_read_write_mdata(desc, mdata, MDATA_WRITE, mdata_parts[0]);
+ if (ret < 0) {
+ log_debug("Updating primary FWU metadata partition failed\n");
+ return ret;
+ }
+
+ /* And now the replica */
+ ret = gpt_read_write_mdata(desc, mdata, MDATA_WRITE, mdata_parts[1]);
+ if (ret < 0) {
+ log_debug("Updating secondary FWU metadata partition failed\n");
+ return ret;
+ }
+
+ return 0;
+}
+
+static int gpt_get_mdata(struct blk_desc *desc, struct fwu_mdata *mdata)
+{
+ int ret;
+ uint mdata_parts[2];
+
+ ret = gpt_get_mdata_partitions(desc, mdata_parts);
+
+ if (ret < 0) {
+ log_debug("Error getting the FWU metadata partitions\n");
+ return -ENOENT;
+ }
+
+ ret = gpt_read_write_mdata(desc, mdata, MDATA_READ, mdata_parts[0]);
+ if (ret < 0) {
+ log_debug("Failed to read the FWU metadata from the device\n");
+ return -EIO;
+ }
+
+ ret = fwu_verify_mdata(mdata, 1);
+ if (!ret)
+ return 0;
+
+ /*
+ * Verification of the primary FWU metadata copy failed.
+ * Try to read the replica.
+ */
+ memset(mdata, '\0', sizeof(struct fwu_mdata));
+ ret = gpt_read_write_mdata(desc, mdata, MDATA_READ, mdata_parts[1]);
+ if (ret < 0) {
+ log_debug("Failed to read the FWU metadata from the device\n");
+ return -EIO;
+ }
+
+ ret = fwu_verify_mdata(mdata, 0);
+ if (!ret)
+ return 0;
+
+ /* Both the FWU metadata copies are corrupted. */
+ return -EIO;
+}
+
+static int fwu_gpt_get_mdata(struct udevice *dev, struct fwu_mdata *mdata)
+{
+ struct fwu_mdata_gpt_blk_priv *priv = dev_get_priv(dev);
+
+ return gpt_get_mdata(dev_get_uclass_plat(priv->blk_dev), mdata);
+}
+
+static int fwu_gpt_get_mdata_partitions(struct udevice *dev, uint *mdata_parts)
+{
+ struct fwu_mdata_gpt_blk_priv *priv = dev_get_priv(dev);
+
+ return gpt_get_mdata_partitions(dev_get_uclass_plat(priv->blk_dev),
+ mdata_parts);
+}
+
+static int fwu_gpt_read_mdata_partition(struct udevice *dev,
+ struct fwu_mdata *mdata, uint part_num)
+{
+ struct fwu_mdata_gpt_blk_priv *priv = dev_get_priv(dev);
+
+ return gpt_read_write_mdata(dev_get_uclass_plat(priv->blk_dev),
+ mdata, MDATA_READ, part_num);
+}
+
+static int fwu_gpt_write_mdata_partition(struct udevice *dev,
+ struct fwu_mdata *mdata, uint part_num)
+{
+ struct fwu_mdata_gpt_blk_priv *priv = dev_get_priv(dev);
+
+ return gpt_read_write_mdata(dev_get_uclass_plat(priv->blk_dev),
+ mdata, MDATA_WRITE, part_num);
+}
+
+static int fwu_get_mdata_device(struct udevice *dev, struct udevice **mdata_dev)
+{
+ u32 phandle;
+ int ret, size;
+ struct udevice *parent;
+ const fdt32_t *phandle_p = NULL;
+
+ phandle_p = dev_read_prop(dev, "fwu-mdata-store", &size);
+ if (!phandle_p) {
+ log_debug("fwu-mdata-store property not found\n");
+ return -ENOENT;
+ }
+
+ phandle = fdt32_to_cpu(*phandle_p);
+
+ ret = device_get_global_by_ofnode(ofnode_get_by_phandle(phandle),
+ &parent);
+ if (ret)
+ return ret;
+
+ return blk_get_from_parent(parent, mdata_dev);
+}
+
+static int fwu_mdata_gpt_blk_probe(struct udevice *dev)
+{
+ int ret;
+ struct udevice *mdata_dev = NULL;
+ struct fwu_mdata_gpt_blk_priv *priv = dev_get_priv(dev);
+
+ ret = fwu_get_mdata_device(dev, &mdata_dev);
+ if (ret)
+ return ret;
+
+ priv->blk_dev = mdata_dev;
+
+ return 0;
+}
+
+static const struct fwu_mdata_ops fwu_gpt_blk_ops = {
+ .get_mdata = fwu_gpt_get_mdata,
+ .update_mdata = fwu_gpt_update_mdata,
+ .get_mdata_part_num = fwu_gpt_get_mdata_partitions,
+ .read_mdata_partition = fwu_gpt_read_mdata_partition,
+ .write_mdata_partition = fwu_gpt_write_mdata_partition,
+};
+
+static const struct udevice_id fwu_mdata_ids[] = {
+ { .compatible = "u-boot,fwu-mdata-gpt" },
+ { }
+};
+
+U_BOOT_DRIVER(fwu_mdata_gpt_blk) = {
+ .name = "fwu-mdata-gpt-blk",
+ .id = UCLASS_FWU_MDATA,
+ .of_match = fwu_mdata_ids,
+ .ops = &fwu_gpt_blk_ops,
+ .probe = fwu_mdata_gpt_blk_probe,
+ .priv_auto = sizeof(struct fwu_mdata_gpt_blk_priv),
+};
projects / u-boot.git / commitdiff