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kernel: add pending bcm47xxpart support for failsafe TRX partition

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Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
This commit is contained in:
Rafał Miłecki 2017-01-10 15:12:04 +01:00
parent ef9208c51e
commit 1a5cb4ac1b
5 changed files with 316 additions and 52 deletions
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4
target/linux/bcm53xx/patches-4.4/901-mtd-bcm47xxpart-add-device-specific-workarounds.patch
View file

@ -9,7 +9,7 @@ Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
--- a/drivers/mtd/bcm47xxpart.c
+++ b/drivers/mtd/bcm47xxpart.c
@@ -14,6 +14,7 @@
@@ -15,6 +15,7 @@
#include <linux/slab.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/partitions.h>
@ -17,7 +17,7 @@ Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
#include <uapi/linux/magic.h>
@@ -159,6 +160,28 @@ static int bcm47xxpart_parse(struct mtd_
@@ -250,6 +251,28 @@ static int bcm47xxpart_parse(struct mtd_
break;
}

180
target/linux/generic/patches-4.4/141-0001-mtd-bcm47xxpart-move-TRX-parsing-code-to-separated-f.patch Normal file
View file

@ -0,0 +1,180 @@
From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl>
Subject: [PATCH 1/2] mtd: bcm47xxpart: move TRX parsing code to separated
function
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
This change simplifies main parsing loop logic a bit. In future it may
be useful for moving TRX support to separated module / parser (if we
implement support for them at some point).
Finally parsing TRX at the end puts us in a better position as we have
better flash layout knowledge. It may be useful e.g. if it appears there
is more than 1 TRX partition.
Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
---
drivers/mtd/bcm47xxpart.c | 124 ++++++++++++++++++++++++++++------------------
1 file changed, 77 insertions(+), 47 deletions(-)
--- a/drivers/mtd/bcm47xxpart.c
+++ b/drivers/mtd/bcm47xxpart.c
@@ -83,6 +83,70 @@ out_default:
return "rootfs";
}
+static int bcm47xxpart_parse_trx(struct mtd_info *master,
+ struct mtd_partition *trx,
+ struct mtd_partition *parts,
+ size_t parts_len)
+{
+ struct mtd_partition *part;
+ struct trx_header header;
+ size_t bytes_read;
+ int curr_part = 0;
+ int i, err;
+
+ if (parts_len < 3) {
+ pr_warn("No enough space to add TRX partitions!\n");
+ return -ENOMEM;
+ }
+
+ err = mtd_read(master, trx->offset, sizeof(header), &bytes_read,
+ (uint8_t *)&header);
+ if (err && !mtd_is_bitflip(err)) {
+ pr_err("mtd_read error while reading TRX header: %d\n", err);
+ return err;
+ }
+
+ i = 0;
+
+ /* We have LZMA loader if offset[2] points to sth */
+ if (header.offset[2]) {
+ part = &parts[curr_part++];
+ part->name = "loader";
+ part->offset = trx->offset + header.offset[i];
+ i++;
+ }
+
+ if (header.offset[i]) {
+ part = &parts[curr_part++];
+ part->name = "linux";
+ part->offset = trx->offset + header.offset[i];
+ i++;
+ }
+
+ if (header.offset[i]) {
+ size_t offset = trx->offset + header.offset[i];
+
+ part = &parts[curr_part++];
+ part->name = bcm47xxpart_trx_data_part_name(master, offset);
+ part->offset = offset;
+ i++;
+ }
+
+ /*
+ * Assume that every partition ends at the beginning of the one it is
+ * followed by.
+ */
+ for (i = 0; i < curr_part; i++) {
+ u64 next_part_offset = (i < curr_part - 1) ?
+ parts[i + 1].offset :
+ trx->offset + trx->size;
+
+ parts[i].size = next_part_offset - parts[i].offset;
+ }
+
+ return curr_part;
+}
+
static int bcm47xxpart_parse(struct mtd_info *master,
struct mtd_partition **pparts,
struct mtd_part_parser_data *data)
@@ -93,9 +157,7 @@ static int bcm47xxpart_parse(struct mtd_
size_t bytes_read;
uint32_t offset;
uint32_t blocksize = master->erasesize;
- struct trx_header *trx;
int trx_part = -1;
- int last_trx_part = -1;
int possible_nvram_sizes[] = { 0x8000, 0xF000, 0x10000, };
int err;
@@ -182,54 +244,14 @@ static int bcm47xxpart_parse(struct mtd_
/* TRX */
if (buf[0x000 / 4] == TRX_MAGIC) {
- if (BCM47XXPART_MAX_PARTS - curr_part < 4) {
- pr_warn("Not enough partitions left to register trx, scanning stopped!\n");
- break;
- }
-
- trx = (struct trx_header *)buf;
+ struct trx_header *trx;
trx_part = curr_part;
bcm47xxpart_add_part(&parts[curr_part++], "firmware",
offset, 0);
- i = 0;
- /* We have LZMA loader if offset[2] points to sth */
- if (trx->offset[2]) {
- bcm47xxpart_add_part(&parts[curr_part++],
- "loader",
- offset + trx->offset[i],
- 0);
- i++;
- }
-
- if (trx->offset[i]) {
- bcm47xxpart_add_part(&parts[curr_part++],
- "linux",
- offset + trx->offset[i],
- 0);
- i++;
- }
-
- /*
- * Pure rootfs size is known and can be calculated as:
- * trx->length - trx->offset[i]. We don't fill it as
- * we want to have jffs2 (overlay) in the same mtd.
- */
- if (trx->offset[i]) {
- const char *name;
-
- name = bcm47xxpart_trx_data_part_name(master, offset + trx->offset[i]);
- bcm47xxpart_add_part(&parts[curr_part++],
- name,
- offset + trx->offset[i],
- 0);
- i++;
- }
-
- last_trx_part = curr_part - 1;
-
/* Jump to the end of TRX */
+ trx = (struct trx_header *)buf;
offset = roundup(offset + trx->length, blocksize);
/* Next loop iteration will increase the offset */
offset -= blocksize;
@@ -307,9 +329,17 @@ static int bcm47xxpart_parse(struct mtd_
parts[i + 1].offset : master->size;
parts[i].size = next_part_offset - parts[i].offset;
- if (i == last_trx_part && trx_part >= 0)
- parts[trx_part].size = next_part_offset -
- parts[trx_part].offset;
+ }
+
+ /* If there was TRX parse it now */
+ if (trx_part >= 0) {
+ int num_parts;
+
+ num_parts = bcm47xxpart_parse_trx(master, &parts[trx_part],
+ parts + curr_part,
+ BCM47XXPART_MAX_PARTS - curr_part);
+ if (num_parts > 0)
+ curr_part += num_parts;
}
*pparts = parts;

108
target/linux/generic/patches-4.4/141-0002-mtd-bcm47xxpart-support-layouts-with-multiple-TRX-pa.patch Normal file
View file

@ -0,0 +1,108 @@
From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl>
Subject: [PATCH 2/2] mtd: bcm47xxpart: support layouts with multiple TRX
partitions
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Some devices may have an extra TRX partition used as failsafe one. If
we detect such partition we should set a proper name for it and don't
parse it.
Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
---
drivers/mtd/bcm47xxpart.c | 56 ++++++++++++++++++++++++++++++++++++++---------
1 file changed, 46 insertions(+), 10 deletions(-)
--- a/drivers/mtd/bcm47xxpart.c
+++ b/drivers/mtd/bcm47xxpart.c
@@ -9,6 +9,7 @@
*
*/
+#include <linux/bcm47xx_nvram.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/slab.h>
@@ -147,6 +148,30 @@ static int bcm47xxpart_parse_trx(struct
return curr_part;
}
+/**
+ * bcm47xxpart_bootpartition - gets index of TRX partition used by bootloader
+ *
+ * Some devices may have more than one TRX partition. In such case one of them
+ * is the main one and another a failsafe one. Bootloader may fallback to the
+ * failsafe firmware if it detects corruption of the main image.
+ *
+ * This function provides info about currently used TRX partition. It's the one
+ * containing kernel started by the bootloader.
+ */
+static int bcm47xxpart_bootpartition(void)
+{
+ char buf[4];
+ int bootpartition;
+
+ /* Check CFE environment variable */
+ if (bcm47xx_nvram_getenv("bootpartition", buf, sizeof(buf)) > 0) {
+ if (!kstrtoint(buf, 0, &bootpartition))
+ return bootpartition;
+ }
+
+ return 0;
+}
+
static int bcm47xxpart_parse(struct mtd_info *master,
struct mtd_partition **pparts,
struct mtd_part_parser_data *data)
@@ -157,7 +182,8 @@ static int bcm47xxpart_parse(struct mtd_
size_t bytes_read;
uint32_t offset;
uint32_t blocksize = master->erasesize;
- int trx_part = -1;
+ int trx_parts[2]; /* Array with indexes of TRX partitions */
+ int trx_num = 0; /* Number of found TRX partitions */
int possible_nvram_sizes[] = { 0x8000, 0xF000, 0x10000, };
int err;
@@ -246,7 +272,11 @@ static int bcm47xxpart_parse(struct mtd_
if (buf[0x000 / 4] == TRX_MAGIC) {
struct trx_header *trx;
- trx_part = curr_part;
+ if (trx_num >= ARRAY_SIZE(trx_parts))
+ pr_warn("No enough space to store another TRX found at 0x%X\n",
+ offset);
+ else
+ trx_parts[trx_num++] = curr_part;
bcm47xxpart_add_part(&parts[curr_part++], "firmware",
offset, 0);
@@ -332,14 +362,20 @@ static int bcm47xxpart_parse(struct mtd_
}
/* If there was TRX parse it now */
- if (trx_part >= 0) {
- int num_parts;
+ for (i = 0; i < trx_num; i++) {
+ struct mtd_partition *trx = &parts[trx_parts[i]];
- num_parts = bcm47xxpart_parse_trx(master, &parts[trx_part],
- parts + curr_part,
- BCM47XXPART_MAX_PARTS - curr_part);
- if (num_parts > 0)
- curr_part += num_parts;
+ if (i == bcm47xxpart_bootpartition()) {
+ int num_parts;
+
+ num_parts = bcm47xxpart_parse_trx(master, trx,
+ parts + curr_part,
+ BCM47XXPART_MAX_PARTS - curr_part);
+ if (num_parts > 0)
+ curr_part += num_parts;
+ } else {
+ trx->name = "failsafe";
+ }
}
*pparts = parts;

72
target/linux/generic/patches-4.4/431-mtd-bcm47xxpart-check-for-bad-blocks-when-calculatin.patch
View file

@ -13,7 +13,7 @@ Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
--- a/drivers/mtd/bcm47xxpart.c
+++ b/drivers/mtd/bcm47xxpart.c
@@ -61,6 +61,34 @@ static void bcm47xxpart_add_part(struct
@@ -62,6 +62,34 @@ static void bcm47xxpart_add_part(struct
part->mask_flags = mask_flags;
}
@ -48,53 +48,29 @@ Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
static const char *bcm47xxpart_trx_data_part_name(struct mtd_info *master,
size_t offset)
{
@@ -182,6 +210,8 @@ static int bcm47xxpart_parse(struct mtd_
@@ -113,19 +141,22 @@ static int bcm47xxpart_parse_trx(struct
if (header.offset[2]) {
part = &parts[curr_part++];
part->name = "loader";
- part->offset = trx->offset + header.offset[i];
+ part->offset = bcm47xxpart_real_offset(master, trx->offset,
+ header.offset[i]);
i++;
}
/* TRX */
if (buf[0x000 / 4] == TRX_MAGIC) {
+ uint32_t tmp;
+
if (BCM47XXPART_MAX_PARTS - curr_part < 4) {
pr_warn("Not enough partitions left to register trx, scanning stopped!\n");
break;
@@ -196,18 +226,18 @@ static int bcm47xxpart_parse(struct mtd_
i = 0;
/* We have LZMA loader if offset[2] points to sth */
if (trx->offset[2]) {
+ tmp = bcm47xxpart_real_offset(master, offset,
+ trx->offset[i]);
bcm47xxpart_add_part(&parts[curr_part++],
- "loader",
- offset + trx->offset[i],
- 0);
+ "loader", tmp, 0);
i++;
}
if (header.offset[i]) {
part = &parts[curr_part++];
part->name = "linux";
- part->offset = trx->offset + header.offset[i];
+ part->offset = bcm47xxpart_real_offset(master, trx->offset,
+ header.offset[i]);
i++;
}
if (trx->offset[i]) {
+ tmp = bcm47xxpart_real_offset(master, offset,
+ trx->offset[i]);
bcm47xxpart_add_part(&parts[curr_part++],
- "linux",
- offset + trx->offset[i],
- 0);
+ "linux", tmp, 0);
i++;
}
@@ -219,11 +249,11 @@ static int bcm47xxpart_parse(struct mtd_
if (trx->offset[i]) {
const char *name;
- name = bcm47xxpart_trx_data_part_name(master, offset + trx->offset[i]);
+ tmp = bcm47xxpart_real_offset(master, offset,
+ trx->offset[i]);
+ name = bcm47xxpart_trx_data_part_name(master, tmp);
bcm47xxpart_add_part(&parts[curr_part++],
- name,
- offset + trx->offset[i],
- 0);
+ name, tmp, 0);
i++;
}
if (header.offset[i]) {
- size_t offset = trx->offset + header.offset[i];
+ size_t offset = bcm47xxpart_real_offset(master, trx->offset,
+ header.offset[i]);
part = &parts[curr_part++];
part->name = bcm47xxpart_trx_data_part_name(master, offset);

4
target/linux/generic/patches-4.4/432-mtd-bcm47xxpart-detect-T_Meter-partition.patch
View file

@ -16,7 +16,7 @@ Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
--- a/drivers/mtd/bcm47xxpart.c
+++ b/drivers/mtd/bcm47xxpart.c
@@ -38,6 +38,7 @@
@@ -39,6 +39,7 @@
#define NVRAM_HEADER 0x48534C46 /* FLSH */
#define POT_MAGIC1 0x54544f50 /* POTT */
#define POT_MAGIC2 0x504f /* OP */
@ -24,7 +24,7 @@ Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
#define ML_MAGIC1 0x39685a42
#define ML_MAGIC2 0x26594131
#define TRX_MAGIC 0x30524448
@@ -207,6 +208,15 @@ static int bcm47xxpart_parse(struct mtd_
@@ -298,6 +299,15 @@ static int bcm47xxpart_parse(struct mtd_
MTD_WRITEABLE);
continue;
}