[U-Boot] [PATCH v2 8/9] ubispl: add support for loading volumes by name

Markus Klotzbuecher
2019-05-15T13:15:59Z

From: Hamish Guthrie <hamish.guthrie@kistler.com>

The motivation is to use the UBI atomic volume rename functionality to
allow double copy software updates on UBI. To that end the SPL is
configured to always load the same volume name (e.g. "u-boot"),
whereas a software updater always installs into the secondary volume
"u-boot_r". After successful installation, these two volume names are
switched.

This extension is protected by #ifdefs as it will somewhat slow down
loading of volumes by id. This is because the code needs to disable
the optimization of ignoring all volume ids which are not
to-be-loaded, since these can only be resolved after attaching.

This adds two vtbl related functions from Linux, which are taken from
the same kernel version as the current main U-Boot UBI code (Linux 4.2
64291f7db5bd8).

Signed-off-by: Hamish Guthrie <hamish.guthrie@kistler.com>
Signed-off-by: Markus Klotzbuecher <markus.klotzbuecher@kistler.com>
Reviewed-by: Heiko Schocher <hs@denx.de>
Cc: Kyungmin Park <kmpark@infradead.org>
---
Changes for v2:
- indicate version of Kernel from which code was copied

common/spl/Kconfig | 13 +++
common/spl/spl_ubi.c | 7 ++
drivers/mtd/ubispl/ubispl.c | 215 +++++++++++++++++++++++++++++++++++-
drivers/mtd/ubispl/ubispl.h | 7 ++
include/ubispl.h | 6 +
5 files changed, 246 insertions(+), 2 deletions(-)

diff --git a/common/spl/Kconfig b/common/spl/Kconfig
index fa63746909..624d084d03 100644
--- a/common/spl/Kconfig
+++ b/common/spl/Kconfig
@@ -563,6 +563,13 @@ config SPL_UBI
README.ubispl for more info.

if SPL_UBI
+config SPL_UBI_LOAD_BY_VOLNAME
+ bool "Support loading volumes by name"
+ help
+ This enables support for loading UBI volumes by name. When this
+ is set, CONFIG_SPL_UBI_LOAD_MONITOR_VOLNAME can be used to
+ configure the volume name from which to load U-Boot.
+
config SPL_UBI_MAX_VOL_LEBS
int "Maximum number of LEBs per volume"
depends on SPL_UBI
@@ -620,6 +627,12 @@ config SPL_UBI_LOAD_MONITOR_ID
help
The UBI volume id from which to load U-Boot

+config SPL_UBI_LOAD_MONITOR_VOLNAME
+ string "volume name of U-Boot volume"
+ depends on SPL_UBI_LOAD_BY_VOLNAME
+ help
+ The UBI volume name from which to load U-Boot
+
config SPL_UBI_LOAD_KERNEL_ID
int "id of kernel volume"
depends on SPL_OS_BOOT && SPL_UBI
diff --git a/common/spl/spl_ubi.c b/common/spl/spl_ubi.c
index 67e5fadd7c..0cb5080882 100644
--- a/common/spl/spl_ubi.c
+++ b/common/spl/spl_ubi.c
@@ -62,7 +62,14 @@ int spl_ubi_load_image(struct spl_image_info *spl_image,
}
#endif
header = spl_get_load_buffer(-sizeof(*header), sizeof(header));
+#ifdef CONFIG_SPL_UBI_LOAD_BY_VOLNAME
+ volumes[0].vol_id = -1;
+ strncpy(volumes[0].name,
+ CONFIG_SPL_UBI_LOAD_MONITOR_VOLNAME,
+ UBI_VOL_NAME_MAX + 1);
+#else
volumes[0].vol_id = CONFIG_SPL_UBI_LOAD_MONITOR_ID;
+#endif
volumes[0].load_addr = (void *)header;

ret = ubispl_load_volumes(&info, volumes, 1);
diff --git a/drivers/mtd/ubispl/ubispl.c b/drivers/mtd/ubispl/ubispl.c
index eeb1cbefb7..3f3b9b4367 100644
--- a/drivers/mtd/ubispl/ubispl.c
+++ b/drivers/mtd/ubispl/ubispl.c
@@ -45,6 +45,187 @@ static int ubi_io_is_bad(struct ubi_scan_info *ubi, int peb)
return peb >= ubi->peb_count || peb < 0;
}

+#ifdef CONFIG_SPL_UBI_LOAD_BY_VOLNAME
+
+/**
+ * ubi_dump_vtbl_record - dump a &struct ubi_vtbl_record object.
+ * @r: the object to dump
+ * @idx: volume table index
+ */
+void ubi_dump_vtbl_record(const struct ubi_vtbl_record *r, int idx)
+{
+ int name_len = be16_to_cpu(r->name_len);
+
+ ubi_dbg("Volume table record %d dump: size: %d",
+ idx, sizeof(struct ubi_vtbl_record));
+ ubi_dbg("\treserved_pebs %d", be32_to_cpu(r->reserved_pebs));
+ ubi_dbg("\talignment %d", be32_to_cpu(r->alignment));
+ ubi_dbg("\tdata_pad %d", be32_to_cpu(r->data_pad));
+ ubi_dbg("\tvol_type %d", (int)r->vol_type);
+ ubi_dbg("\tupd_marker %d", (int)r->upd_marker);
+ ubi_dbg("\tname_len %d", name_len);
+
+ if (r->name[0] == '\0') {
+ ubi_dbg("\tname NULL");
+ return;
+ }
+
+ if (name_len <= UBI_VOL_NAME_MAX &&
+ strnlen(&r->name[0], name_len + 1) == name_len) {
+ ubi_dbg("\tname %s", &r->name[0]);
+ } else {
+ ubi_dbg("\t1st 5 characters of name: %c%c%c%c%c",
+ r->name[0], r->name[1], r->name[2], r->name[3],
+ r->name[4]);
+ }
+ ubi_dbg("\tcrc %#08x", be32_to_cpu(r->crc));
+}
+
+/* Empty volume table record */
+static struct ubi_vtbl_record empty_vtbl_record;
+
+/**
+ * vtbl_check - check if volume table is not corrupted and sensible.
+ * @ubi: UBI device description object
+ * @vtbl: volume table
+ *
+ * This function returns zero if @vtbl is all right, %1 if CRC is incorrect,
+ * and %-EINVAL if it contains inconsistent data.
+ */
+static int vtbl_check(struct ubi_scan_info *ubi,
+ struct ubi_vtbl_record *vtbl)
+{
+ int i, n, reserved_pebs, alignment, data_pad, vol_type, name_len;
+ int upd_marker, err;
+ uint32_t crc;
+ const char *name;
+
+ for (i = 0; i < UBI_SPL_VOL_IDS; i++) {
+ reserved_pebs = be32_to_cpu(vtbl[i].reserved_pebs);
+ alignment = be32_to_cpu(vtbl[i].alignment);
+ data_pad = be32_to_cpu(vtbl[i].data_pad);
+ upd_marker = vtbl[i].upd_marker;
+ vol_type = vtbl[i].vol_type;
+ name_len = be16_to_cpu(vtbl[i].name_len);
+ name = &vtbl[i].name[0];
+
+ crc = crc32(UBI_CRC32_INIT, &vtbl[i], UBI_VTBL_RECORD_SIZE_CRC);
+ if (be32_to_cpu(vtbl[i].crc) != crc) {
+ ubi_err("bad CRC@record %u: %#08x, not %#08x",
+ i, crc, be32_to_cpu(vtbl[i].crc));
+ ubi_dump_vtbl_record(&vtbl[i], i);
+ return 1;
+ }
+
+ if (reserved_pebs == 0) {
+ if (memcmp(&vtbl[i], &empty_vtbl_record,
+ UBI_VTBL_RECORD_SIZE)) {
+ err = 2;
+ goto bad;
+ }
+ continue;
+ }
+
+ if (reserved_pebs < 0 || alignment < 0 || data_pad < 0 ||
+ name_len < 0) {
+ err = 3;
+ goto bad;
+ }
+
+ if (alignment > ubi->leb_size || alignment == 0) {
+ err = 4;
+ goto bad;
+ }
+
+ n = alignment & (CONFIG_SPL_UBI_VID_OFFSET - 1);
+ if (alignment != 1 && n) {
+ err = 5;
+ goto bad;
+ }
+
+ n = ubi->leb_size % alignment;
+ if (data_pad != n) {
+ ubi_err("bad data_pad, has to be %d", n);
+ err = 6;
+ goto bad;
+ }
+
+ if (vol_type != UBI_VID_DYNAMIC && vol_type != UBI_VID_STATIC) {
+ err = 7;
+ goto bad;
+ }
+
+ if (upd_marker != 0 && upd_marker != 1) {
+ err = 8;
+ goto bad;
+ }
+
+ if (name_len > UBI_VOL_NAME_MAX) {
+ err = 10;
+ goto bad;
+ }
+
+ if (name[0] == '\0') {
+ err = 11;
+ goto bad;
+ }
+
+ if (name_len != strnlen(name, name_len + 1)) {
+ err = 12;
+ goto bad;
+ }
+
+ ubi_dump_vtbl_record(&vtbl[i], i);
+ }
+
+ /* Checks that all names are unique */
+ for (i = 0; i < UBI_SPL_VOL_IDS - 1; i++) {
+ for (n = i + 1; n < UBI_SPL_VOL_IDS; n++) {
+ int len1 = be16_to_cpu(vtbl[i].name_len);
+ int len2 = be16_to_cpu(vtbl[n].name_len);
+
+ if (len1 > 0 && len1 == len2 &&
+ !strncmp(vtbl[i].name, vtbl[n].name, len1)) {
+ ubi_err("volumes %d and %d have the same name \"%s\"",
+ i, n, vtbl[i].name);
+ ubi_dump_vtbl_record(&vtbl[i], i);
+ ubi_dump_vtbl_record(&vtbl[n], n);
+ return -EINVAL;
+ }
+ }
+ }
+
+ return 0;
+
+bad:
+ ubi_err("volume table check failed: record %d, error %d", i, err);
+ ubi_dump_vtbl_record(&vtbl[i], i);
+ return -EINVAL;
+}
+
+static int ubi_read_volume_table(struct ubi_scan_info *ubi, u32 pnum)
+{
+ int err = -EINVAL;
+
+ empty_vtbl_record.crc = cpu_to_be32(0xf116c36b);
+
+ err = ubi_io_read(ubi, &ubi->vtbl, pnum, ubi->leb_start,
+ sizeof(struct ubi_vtbl_record) * UBI_SPL_VOL_IDS);
+ if (err && err != UBI_IO_BITFLIPS) {
+ ubi_err("unable to read volume table");
+ goto out;
+ }
+
+ if (!vtbl_check(ubi, ubi->vtbl)) {
+ ubi->vtbl_valid = 1;
+ err = 0;
+ }
+out:
+ return err;
+}
+
+#endif /* CONFIG_SPL_UBI_LOAD_BY_VOLNAME */
+
static int ubi_io_read_vid_hdr(struct ubi_scan_info *ubi, int pnum,
struct ubi_vid_hdr *vh, int unused)
{
@@ -210,14 +391,23 @@ static int ubi_scan_vid_hdr(struct ubi_scan_info *ubi, struct ubi_vid_hdr *vh,
if (vol_id == UBI_FM_SB_VOLUME_ID)
return ubi->fm_enabled ? UBI_FASTMAP_ANCHOR : 0;

+#ifdef CONFIG_SPL_UBI_LOAD_BY_VOLNAME
+ /* If this is a UBI volume table, read it and return */
+ if (vol_id == UBI_LAYOUT_VOLUME_ID && !ubi->vtbl_valid) {
+ res = ubi_read_volume_table(ubi, pnum);
+ return res;
+ }
+#endif
+
/* We only care about static volumes with an id < UBI_SPL_VOL_IDS */
if (vol_id >= UBI_SPL_VOL_IDS || vh->vol_type != UBI_VID_STATIC)
return 0;

+#ifndef CONFIG_SPL_UBI_LOAD_BY_VOLNAME
/* We are only interested in the volumes to load */
if (!test_bit(vol_id, ubi->toload))
return 0;
-
+#endif
lnum = be32_to_cpu(vh->lnum);
return ubi_add_peb_to_vol(ubi, vh, vol_id, pnum, lnum);
}
@@ -232,13 +422,14 @@ static int assign_aeb_to_av(struct ubi_scan_info *ubi, u32 pnum, u32 lnum,

ubi->fastmap_pebs++;

+#ifndef CONFIG_SPL_UBI_LOAD_BY_VOLNAME
if (vol_id >= UBI_SPL_VOL_IDS || vol_type != UBI_STATIC_VOLUME)
return 0;

/* We are only interested in the volumes to load */
if (!test_bit(vol_id, ubi->toload))
return 0;
-
+#endif
vh = ubi->blockinfo + pnum;

return ubi_scan_vid_hdr(ubi, vh, pnum);
@@ -892,6 +1083,10 @@ retry:
ubi->peb_count = info->peb_count;
ubi->peb_offset = info->peb_offset;

+#ifdef CONFIG_SPL_UBI_LOAD_BY_VOLNAME
+ ubi->vtbl_valid = 0;
+#endif
+
fsize = info->peb_size * info->peb_count;
ubi->fsize_mb = fsize >> 20;

@@ -910,7 +1105,23 @@ retry:
for (i = 0; i < nrvols; i++) {
struct ubispl_load *lv = lvols + i;

+#ifdef CONFIG_SPL_UBI_LOAD_BY_VOLNAME
+ if (lv->vol_id == -1) {
+ for (int j = 0; j < UBI_SPL_VOL_IDS; j++) {
+ int len = be16_to_cpu(ubi->vtbl[j].name_len);
+
+ if (strncmp(lv->name,
+ ubi->vtbl[j].name,
+ len) == 0) {
+ lv->vol_id = j;
+ break;
+ }
+ }
+ }
+ ubi_msg("Loading VolName %s (VolId #%d)", lv->name, lv->vol_id);
+#else
ubi_msg("Loading VolId #%d", lv->vol_id);
+#endif
res = ipl_load(ubi, lv->vol_id, lv->load_addr);
if (res < 0) {
if (fastmap) {
diff --git a/drivers/mtd/ubispl/ubispl.h b/drivers/mtd/ubispl/ubispl.h
index 9e40b46eac..bcc376c6d7 100644
--- a/drivers/mtd/ubispl/ubispl.h
+++ b/drivers/mtd/ubispl/ubispl.h
@@ -77,6 +77,8 @@ struct ubi_vol_info {
* @blockinfo: The vid headers of the scanned blocks
* @volinfo: The volume information of the interesting (toload)
* volumes
+ * @vtbl_corrupted: Flag to indicate status of volume table
+ * @vtbl: Volume table
*
* @fm_buf: The large fastmap attach buffer
*/
@@ -112,6 +114,11 @@ struct ubi_scan_info {
struct ubi_vol_info volinfo[UBI_SPL_VOL_IDS];
struct ubi_vid_hdr blockinfo[CONFIG_SPL_UBI_MAX_PEBS];

+#ifdef CONFIG_SPL_UBI_LOAD_BY_VOLNAME
+ /* Volume table */
+ int vtbl_valid;
+ struct ubi_vtbl_record vtbl[UBI_SPL_VOL_IDS];
+#endif
/* The large buffer for the fastmap */
uint8_t fm_buf[UBI_FM_BUF_SIZE];
};
diff --git a/include/ubispl.h b/include/ubispl.h
index 1e5da94eb1..ecfe0c93c1 100644
--- a/include/ubispl.h
+++ b/include/ubispl.h
@@ -5,6 +5,8 @@
#ifndef __UBOOT_UBISPL_H
#define __UBOOT_UBISPL_H

+#define UBI_VOL_NAME_MAX 127
+
/*
* The following CONFIG options are relevant for UBISPL
*
@@ -74,6 +76,10 @@ struct ubispl_info {
*/
struct ubispl_load {
int vol_id;
+#ifdef CONFIG_SPL_UBI_LOAD_BY_VOLNAME
+ u32 name_len;
+ char name[UBI_VOL_NAME_MAX + 1];
+#endif
void *load_addr;
};

--
2.20.1