mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-05 11:00:15 +00:00
246ec2a12c
The common code can now read, verify and fix meta-data copies while exposing one consistent structure to users. Only the .read_mdata() and .write_mdata() callbacks of fwu_mdata_ops are needed. Get rid of .get_mdata() .update_mdata() .get_mdata_part_num() .read_mdata_partition() and .write_mdata_partition() and also the corresponding wrapper functions. Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org> Reviewed-by: Etienne Carriere <etienne.carriere@linaro.org> Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org> Tested-by: Sughosh Ganu <sughosh.ganu@linaro.org>
217 lines
5 KiB
C
217 lines
5 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (c) 2022, Linaro Limited
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*/
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#define LOG_CATEGORY UCLASS_FWU_MDATA
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#include <blk.h>
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#include <dm.h>
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#include <efi_loader.h>
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#include <fwu.h>
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#include <fwu_mdata.h>
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#include <log.h>
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#include <memalign.h>
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#include <part.h>
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#include <part_efi.h>
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#include <dm/device-internal.h>
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#include <linux/errno.h>
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#include <linux/types.h>
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enum {
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MDATA_READ = 1,
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MDATA_WRITE,
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};
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static uint g_mdata_part[2]; /* = {0, 0} to check against uninit parts */
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static int gpt_get_mdata_partitions(struct blk_desc *desc)
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{
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int i;
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u32 nparts;
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efi_guid_t part_type_guid;
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struct disk_partition info;
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const efi_guid_t fwu_mdata_guid = FWU_MDATA_GUID;
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/* if primary and secondary partitions already found */
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if (g_mdata_part[0] && g_mdata_part[1])
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return 0;
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nparts = 0;
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for (i = 1; i < MAX_SEARCH_PARTITIONS && nparts < 2; i++) {
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if (part_get_info(desc, i, &info))
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continue;
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uuid_str_to_bin(info.type_guid, part_type_guid.b,
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UUID_STR_FORMAT_GUID);
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if (!guidcmp(&fwu_mdata_guid, &part_type_guid))
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g_mdata_part[nparts++] = i;
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}
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if (nparts != 2) {
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log_debug("Expect two copies of the FWU metadata instead of %d\n",
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nparts);
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g_mdata_part[0] = 0;
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g_mdata_part[1] = 0;
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return -EINVAL;
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}
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return 0;
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}
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static int gpt_get_mdata_disk_part(struct blk_desc *desc,
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struct disk_partition *info,
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u32 part_num)
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{
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int ret;
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char *mdata_guid_str = "8a7a84a0-8387-40f6-ab41-a8b9a5a60d23";
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ret = part_get_info(desc, part_num, info);
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if (ret < 0) {
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log_debug("Unable to get the partition info for the FWU metadata part %d\n",
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part_num);
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return -ENOENT;
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}
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/* Check that it is indeed the FWU metadata partition */
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if (!strncmp(info->type_guid, mdata_guid_str, UUID_STR_LEN))
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return 0;
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return -ENOENT;
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}
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static int gpt_read_write_mdata(struct blk_desc *desc,
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struct fwu_mdata *mdata,
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u8 access, u32 part_num)
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{
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int ret;
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u32 len, blk_start, blkcnt;
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struct disk_partition info;
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ALLOC_CACHE_ALIGN_BUFFER_PAD(struct fwu_mdata, mdata_aligned, 1,
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desc->blksz);
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if (!mdata)
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return -ENOMEM;
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ret = gpt_get_mdata_disk_part(desc, &info, part_num);
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if (ret < 0) {
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printf("Unable to get the FWU metadata partition\n");
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return -ENOENT;
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}
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len = sizeof(*mdata);
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blkcnt = BLOCK_CNT(len, desc);
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if (blkcnt > info.size) {
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log_debug("Block count exceeds FWU metadata partition size\n");
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return -ERANGE;
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}
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blk_start = info.start;
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if (access == MDATA_READ) {
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if (blk_dread(desc, blk_start, blkcnt, mdata_aligned) != blkcnt) {
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log_debug("Error reading FWU metadata from the device\n");
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return -EIO;
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}
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memcpy(mdata, mdata_aligned, sizeof(struct fwu_mdata));
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} else {
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if (blk_dwrite(desc, blk_start, blkcnt, mdata) != blkcnt) {
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log_debug("Error writing FWU metadata to the device\n");
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return -EIO;
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}
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}
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return 0;
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}
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static int fwu_get_mdata_device(struct udevice *dev, struct udevice **mdata_dev)
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{
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u32 phandle;
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int ret, size;
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struct udevice *parent;
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const fdt32_t *phandle_p = NULL;
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phandle_p = dev_read_prop(dev, "fwu-mdata-store", &size);
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if (!phandle_p) {
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log_debug("fwu-mdata-store property not found\n");
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return -ENOENT;
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}
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phandle = fdt32_to_cpu(*phandle_p);
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ret = device_get_global_by_ofnode(ofnode_get_by_phandle(phandle),
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&parent);
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if (ret)
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return ret;
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return blk_get_from_parent(parent, mdata_dev);
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}
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static int fwu_mdata_gpt_blk_probe(struct udevice *dev)
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{
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int ret;
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struct udevice *mdata_dev = NULL;
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struct fwu_mdata_gpt_blk_priv *priv = dev_get_priv(dev);
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ret = fwu_get_mdata_device(dev, &mdata_dev);
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if (ret)
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return ret;
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priv->blk_dev = mdata_dev;
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return 0;
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}
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static int fwu_gpt_read_mdata(struct udevice *dev, struct fwu_mdata *mdata,
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bool primary)
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{
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struct fwu_mdata_gpt_blk_priv *priv = dev_get_priv(dev);
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struct blk_desc *desc = dev_get_uclass_plat(priv->blk_dev);
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int ret;
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ret = gpt_get_mdata_partitions(desc);
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if (ret < 0) {
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log_debug("Error getting the FWU metadata partitions\n");
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return -ENOENT;
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}
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return gpt_read_write_mdata(desc, mdata, MDATA_READ,
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primary ? g_mdata_part[0] : g_mdata_part[1]);
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}
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static int fwu_gpt_write_mdata(struct udevice *dev, struct fwu_mdata *mdata,
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bool primary)
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{
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struct fwu_mdata_gpt_blk_priv *priv = dev_get_priv(dev);
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struct blk_desc *desc = dev_get_uclass_plat(priv->blk_dev);
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int ret;
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ret = gpt_get_mdata_partitions(desc);
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if (ret < 0) {
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log_debug("Error getting the FWU metadata partitions\n");
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return -ENOENT;
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}
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return gpt_read_write_mdata(desc, mdata, MDATA_WRITE,
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primary ? g_mdata_part[0] : g_mdata_part[1]);
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}
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static const struct fwu_mdata_ops fwu_gpt_blk_ops = {
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.read_mdata = fwu_gpt_read_mdata,
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.write_mdata = fwu_gpt_write_mdata,
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};
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static const struct udevice_id fwu_mdata_ids[] = {
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{ .compatible = "u-boot,fwu-mdata-gpt" },
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{ }
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};
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U_BOOT_DRIVER(fwu_mdata_gpt_blk) = {
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.name = "fwu-mdata-gpt-blk",
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.id = UCLASS_FWU_MDATA,
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.of_match = fwu_mdata_ids,
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.ops = &fwu_gpt_blk_ops,
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.probe = fwu_mdata_gpt_blk_probe,
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.priv_auto = sizeof(struct fwu_mdata_gpt_blk_priv),
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};
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