[PATCH v4 1/1] cmd: gpt: add eMMC and GPT support
Rayagonda Kokatanur
rayagonda.kokatanur at broadcom.com
Thu Jul 23 14:00:38 CEST 2020
From: Corneliu Doban <cdoban at broadcom.com>
Add eMMC and GPT support.
- GPT partition list and command to create the GPT added to u-boot
environment
- eMMC boot commands added to u-boot environment
- new gpt commands (enumarate and setenv) that are used by broadcom
update scripts and boot commands
- eMMC specific u-boot configurations with environment saved in eMMC
and GPT support
Signed-off-by: Corneliu Doban <cdoban at broadcom.com>
Signed-off-by: Rayagonda Kokatanur <rayagonda.kokatanur at broadcom.com>
---
Changes from v3:
-Address review comments from Simon Glass,
Return -ve number instead of 1 upon failure,
Use shorter variable name,
Modified code to avoid buffer overflow,
Use if (!strcmp(...)) instead of if (strcmp(...) == 0)
Changes from v2:
-Address review comments from Simon Glass,
Check for return value of part_driver_get_count(),
Don't check return value of part_driver_get(),
Rewrite part_driver_get() and rename to part_driver_get_first(),
Use env_set_ulong() whereever applicable,
-Address review comments from Michael Nazzareno Trimarchi,
Add new function to set all env vriables,
Changes from v1:
-Address review comments from Simon Glass,
Correct function comments,
Check for return value,
Add helper function in part.h
cmd/gpt.c | 161 +++++++++++++++++++++++++++++++++++++++++++++++++
include/part.h | 29 +++++++++
2 files changed, 190 insertions(+)
diff --git a/cmd/gpt.c b/cmd/gpt.c
index df759416c8..2626992e59 100644
--- a/cmd/gpt.c
+++ b/cmd/gpt.c
@@ -18,6 +18,7 @@
#include <command.h>
#include <part.h>
#include <part_efi.h>
+#include <part.h>
#include <exports.h>
#include <uuid.h>
#include <linux/ctype.h>
@@ -621,6 +622,152 @@ static int gpt_verify(struct blk_desc *blk_dev_desc, const char *str_part)
return ret;
}
+/**
+ * gpt_enumerate() - Enumerate partition names into environment variable.
+ *
+ * Enumerate partition names. Partition names are stored in gpt_partition_list
+ * environment variable. Each partition name is delimited by space.
+ *
+ * @desc: block device descriptor
+ *
+ * @Return: '0' on success and -ve error on failure
+ */
+static int gpt_enumerate(struct blk_desc *desc)
+{
+ struct part_driver *first_drv, *part_drv;
+ int str_len = 0, tmp_len;
+ char part_list[2048];
+ int n_drvs;
+ char *ptr;
+
+ part_list[0] = 0;
+ n_drvs = part_driver_get_count();
+ if (!n_drvs) {
+ printf("Failed to get partition driver count\n");
+ return -ENOENT;
+ }
+
+ first_drv = part_driver_get_first();
+ for (part_drv = first_drv; part_drv != first_drv + n_drvs; part_drv++) {
+ struct disk_partition pinfo;
+ int ret;
+ int i;
+
+ for (i = 1; i < part_drv->max_entries; i++) {
+ ret = part_drv->get_info(desc, i, &pinfo);
+ if (ret) {
+ /* no more entries in table */
+ break;
+ }
+
+ ptr = &part_list[str_len];
+ tmp_len = strlen((const char *)pinfo.name);
+ str_len += tmp_len;
+ /* +1 for space */
+ str_len++;
+ if (str_len > sizeof(part_list)) {
+ printf("Error insufficient memory\n");
+ return -ENOMEM;
+ }
+ strcpy(ptr, (const char *)pinfo.name);
+ /* One byte for space(" ") delimiter */
+ ptr[tmp_len] = ' ';
+ }
+ }
+ if (*part_list)
+ part_list[strlen(part_list) - 1] = 0;
+ debug("setenv gpt_partition_list %s\n", part_list);
+
+ return env_set("gpt_partition_list", part_list);
+}
+
+/**
+ * gpt_setenv_part_variables() - setup partition environmental variables
+ *
+ * Setup the gpt_partition_name, gpt_partition_entry, gpt_partition_addr
+ * and gpt_partition_size environment variables.
+ *
+ * @pinfo: pointer to disk partition
+ * @i: partition entry
+ *
+ * @Return: '0' on success and -ENOENT on failure
+ */
+static int gpt_setenv_part_variables(struct disk_partition *pinfo, int i)
+{
+ int ret;
+
+ ret = env_set_ulong("gpt_partition_addr", pinfo->start);
+ if (ret)
+ goto fail;
+
+ ret = env_set_ulong("gpt_partition_size", pinfo->size);
+ if (ret)
+ goto fail;
+
+ ret = env_set_ulong("gpt_partition_entry", i);
+ if (ret)
+ goto fail;
+
+ ret = env_set("gpt_partition_name", (const char *)pinfo->name);
+ if (ret)
+ goto fail;
+
+ return 0;
+
+fail:
+ return -ENOENT;
+}
+
+/**
+ * gpt_setenv() - Dynamically setup environment variables.
+ *
+ * Dynamically setup environment variables for name, index, offset and size
+ * for partition in GPT table after running "gpt setenv" for a partition name.
+ *
+ * @desc: block device descriptor
+ * @name: partition name
+ *
+ * @Return: '0' on success and -ve err on failure
+ */
+static int gpt_setenv(struct blk_desc *desc, const char *name)
+{
+ struct part_driver *first_drv, *part_drv;
+ int n_drvs;
+ int ret;
+
+ n_drvs = part_driver_get_count();
+ if (!n_drvs) {
+ printf("Failed to get partition driver count\n");
+ goto fail;
+ }
+
+ first_drv = part_driver_get_first();
+ for (part_drv = first_drv; part_drv != first_drv + n_drvs; part_drv++) {
+ struct disk_partition pinfo;
+ int i;
+
+ for (i = 1; i < part_drv->max_entries; i++) {
+ ret = part_drv->get_info(desc, i, &pinfo);
+ if (ret) {
+ /* no more entries in table */
+ break;
+ }
+
+ if (!strcmp(name, (const char *)pinfo.name)) {
+ /* match found, setup environment variables */
+ ret = gpt_setenv_part_variables(&pinfo, i);
+ if (ret)
+ goto fail;
+
+ return 0;
+ }
+ }
+ }
+
+fail:
+ return ret;
+}
+
static int do_disk_guid(struct blk_desc *dev_desc, char * const namestr)
{
int ret;
@@ -827,6 +974,10 @@ static int do_gpt(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
} else if ((strcmp(argv[1], "verify") == 0)) {
ret = gpt_verify(blk_dev_desc, argv[4]);
printf("Verify GPT: ");
+ } else if ((strcmp(argv[1], "setenv") == 0)) {
+ ret = gpt_setenv(blk_dev_desc, argv[4]);
+ } else if ((strcmp(argv[1], "enumerate") == 0)) {
+ ret = gpt_enumerate(blk_dev_desc);
} else if (strcmp(argv[1], "guid") == 0) {
ret = do_disk_guid(blk_dev_desc, argv[4]);
#ifdef CONFIG_CMD_GPT_RENAME
@@ -857,7 +1008,17 @@ U_BOOT_CMD(gpt, CONFIG_SYS_MAXARGS, 1, do_gpt,
" to interface\n"
" Example usage:\n"
" gpt write mmc 0 $partitions\n"
+ " - write the GPT to device\n"
" gpt verify mmc 0 $partitions\n"
+ " - verify the GPT on device against $partitions\n"
+ " gpt setenv mmc 0 $name\n"
+ " - setup environment variables for partition $name:\n"
+ " gpt_partition_addr, gpt_partition_size,\n"
+ " gpt_partition_name, gpt_partition_entry\n"
+ " gpt enumerate mmc 0\n"
+ " - store list of partitions to gpt_partition_list environment variable\n"
+ " read <interface> <dev>\n"
+ " - read GPT into a data structure for manipulation\n"
" gpt guid <interface> <dev>\n"
" - print disk GUID\n"
" gpt guid <interface> <dev> <varname>\n"
diff --git a/include/part.h b/include/part.h
index 55be724d20..31a130311a 100644
--- a/include/part.h
+++ b/include/part.h
@@ -9,6 +9,7 @@
#include <blk.h>
#include <ide.h>
#include <uuid.h>
+#include <linker_lists.h>
#include <linux/list.h>
struct block_drvr {
@@ -476,5 +477,33 @@ int write_mbr_partition(struct blk_desc *dev_desc, void *buf);
#endif
+#ifdef CONFIG_PARTITIONS
+/**
+ * part_driver_get_count() - get partition driver count
+ *
+ * @return - number of partition drivers
+ */
+static inline int part_driver_get_count(void)
+{
+ return ll_entry_count(struct part_driver, part_driver);
+}
+
+/**
+ * part_driver_get_first() - get first partition driver
+ *
+ * @return - pointer to first partition driver on success, otherwise NULL
+ */
+static inline struct part_driver *part_driver_get_first(void)
+{
+ return ll_entry_start(struct part_driver, part_driver);
+}
+
+#else
+static inline int part_driver_get_count(void)
+{ return 0; }
+
+static inline struct part_driver *part_driver_get_first(void)
+{ return NULL; }
+#endif /* CONFIG_PARTITIONS */
#endif /* _PART_H */
--
2.17.1
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