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doc: add partition API to HTML documentation

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* Convert comments in part.h to Sphinx style.
* Create documentation page for the partition API.
* Add the partition API page to the API index page.

Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Heinrich Schuchardt 2023-08-15 12:30:19 +02:00
parent 289bd72ea4
commit 5aae021c30
3 changed files with 119 additions and 98 deletions
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1
doc/api/index.rst
View file

@ -15,6 +15,7 @@ U-Boot API documentation
lmb lmb
logging logging
nvmem nvmem
part
pinctrl pinctrl
rng rng
sandbox sandbox

6
doc/api/part.rst Normal file
View file

@ -0,0 +1,6 @@
.. SPDX-License-Identifier: GPL-2.0+
Partition API
=============
.. kernel-doc:: include/part.h

210
include/part.h
View file

@ -98,8 +98,8 @@ struct disk_part {
* @ifname: Interface name (e.g. "ide", "scsi") * @ifname: Interface name (e.g. "ide", "scsi")
* @dev: Device number (0 for first device on that interface, 1 for * @dev: Device number (0 for first device on that interface, 1 for
* second, etc. * second, etc.
* Return: pointer to the block device, or NULL if not available, or an * Return:
* error occurred. * pointer to the block device, or NULL if not available, or an error occurred.
*/ */
struct blk_desc *blk_get_dev(const char *ifname, int dev); struct blk_desc *blk_get_dev(const char *ifname, int dev);
@ -128,6 +128,10 @@ int part_get_info(struct blk_desc *dev_desc, int part,
/** /**
* part_get_info_whole_disk() - get partition info for the special case of * part_get_info_whole_disk() - get partition info for the special case of
* a partition occupying the entire disk. * a partition occupying the entire disk.
*
* @dev_desc: block device descriptor
* @info: returned partition information
* Return: 0 on success
*/ */
int part_get_info_whole_disk(struct blk_desc *dev_desc, int part_get_info_whole_disk(struct blk_desc *dev_desc,
struct disk_partition *info); struct disk_partition *info);
@ -170,15 +174,18 @@ int blk_get_device_by_str(const char *ifname, const char *dev_str,
* This calls blk_get_device_by_str() to look up a device. It also looks up * This calls blk_get_device_by_str() to look up a device. It also looks up
* a partition and returns information about it. * a partition and returns information about it.
* *
* @dev_part_str is in the format: * @dev_part_str is in the format <dev>.<hw_part>:<part> where
* <dev>.<hw_part>:<part> where <dev> is the device number,
* <hw_part> is the optional hardware partition number and
* <part> is the partition number
* *
* If ifname is "hostfs" then this function returns the sandbox host block * * <dev> is the device number,
*
* * <hw_part> is the optional hardware partition number and
*
* * <part> is the partition number.
*
* If @ifname is "hostfs", then this function returns the sandbox host block
* device. * device.
* *
* If ifname is ubi, then this function returns 0, with @info set to a * If @ifname is "ubi", then this function returns 0, with @info set to a
* special UBI device. * special UBI device.
* *
* If @dev_part_str is NULL or empty or "-", then this function looks up * If @dev_part_str is NULL or empty or "-", then this function looks up
@ -187,13 +194,13 @@ int blk_get_device_by_str(const char *ifname, const char *dev_str,
* If the partition string is empty then the first partition is used. If the * If the partition string is empty then the first partition is used. If the
* partition string is "auto" then the first bootable partition is used. * partition string is "auto" then the first bootable partition is used.
* *
* @ifname: Interface name (e.g. "ide", "scsi") * @ifname: Interface name (e.g. "ide", "scsi")
* @dev_part_str: Device and partition string * @dev_part_str: Device and partition string
* @dev_desc: Returns a pointer to the block device on success * @dev_desc: Returns a pointer to the block device on success
* @info: Returns partition information * @info: Returns partition information
* @allow_whole_dev: true to allow the user to select partition 0 * @allow_whole_dev: true to allow the user to select partition 0
* (which means the whole device), false to require a valid * (which means the whole device), false to require a valid
* partition number >= 1 * partition number >= 1
* Return: partition number, or -1 on error * Return: partition number, or -1 on error
* *
*/ */
@ -205,18 +212,20 @@ int blk_get_device_part_str(const char *ifname, const char *dev_part_str,
* part_get_info_by_name() - Search for a partition by name * part_get_info_by_name() - Search for a partition by name
* among all available registered partitions * among all available registered partitions
* *
* @param dev_desc - block device descriptor * @dev_desc: block device descriptor
* @param gpt_name - the specified table entry name * @name: the specified table entry name
* @param info - returns the disk partition info * @info: returns the disk partition info
* *
* Return: - the partition number on match (starting on 1), -1 on no match, * Return: the partition number on match (starting on 1), -1 on no match,
* otherwise error * otherwise error
*/ */
int part_get_info_by_name(struct blk_desc *dev_desc, int part_get_info_by_name(struct blk_desc *dev_desc,
const char *name, struct disk_partition *info); const char *name, struct disk_partition *info);
/** /**
* Get partition info from dev number + part name, or dev number + part number. * part_get_info_by_dev_and_name_or_num() - Get partition info from dev number
* and part name, or dev number and
* part number.
* *
* Parse a device number and partition description (either name or number) * Parse a device number and partition description (either name or number)
* in the form of device number plus partition name separated by a "#" * in the form of device number plus partition name separated by a "#"
@ -225,14 +234,14 @@ int part_get_info_by_name(struct blk_desc *dev_desc,
* partition descriptions for a given interface. If the partition is found, sets * partition descriptions for a given interface. If the partition is found, sets
* dev_desc and part_info accordingly with the information of the partition. * dev_desc and part_info accordingly with the information of the partition.
* *
* @param[in] dev_iface Device interface * @dev_iface: Device interface
* @param[in] dev_part_str Input partition description, like "0#misc" or "0:1" * @dev_part_str: Input partition description, like "0#misc" or "0:1"
* @param[out] dev_desc Place to store the device description pointer * @dev_desc: Place to store the device description pointer
* @param[out] part_info Place to store the partition information * @part_info: Place to store the partition information
* @param[in] allow_whole_dev true to allow the user to select partition 0 * @allow_whole_dev: true to allow the user to select partition 0
* (which means the whole device), false to require a valid * (which means the whole device), false to require a valid
* partition number >= 1 * partition number >= 1
* Return: the partition number on success, or negative errno on error * Return: the partition number on success, or negative errno on error
*/ */
int part_get_info_by_dev_and_name_or_num(const char *dev_iface, int part_get_info_by_dev_and_name_or_num(const char *dev_iface,
const char *dev_part_str, const char *dev_part_str,
@ -322,7 +331,7 @@ int part_create_block_devices(struct udevice *blk_dev);
* @start: Start block number to read in the partition (0=first) * @start: Start block number to read in the partition (0=first)
* @blkcnt: Number of blocks to read * @blkcnt: Number of blocks to read
* @buffer: Destination buffer for data read * @buffer: Destination buffer for data read
* Returns: number of blocks read, or -ve error number (see the * Return: number of blocks read, or -ve error number (see the
* IS_ERR_VALUE() macro * IS_ERR_VALUE() macro
*/ */
ulong disk_blk_read(struct udevice *dev, lbaint_t start, lbaint_t blkcnt, ulong disk_blk_read(struct udevice *dev, lbaint_t start, lbaint_t blkcnt,
@ -335,7 +344,7 @@ ulong disk_blk_read(struct udevice *dev, lbaint_t start, lbaint_t blkcnt,
* @start: Start block number to write in the partition (0=first) * @start: Start block number to write in the partition (0=first)
* @blkcnt: Number of blocks to write * @blkcnt: Number of blocks to write
* @buffer: Source buffer for data to write * @buffer: Source buffer for data to write
* Returns: number of blocks written, or -ve error number (see the * Return: number of blocks written, or -ve error number (see the
* IS_ERR_VALUE() macro * IS_ERR_VALUE() macro
*/ */
ulong disk_blk_write(struct udevice *dev, lbaint_t start, lbaint_t blkcnt, ulong disk_blk_write(struct udevice *dev, lbaint_t start, lbaint_t blkcnt,
@ -347,7 +356,7 @@ ulong disk_blk_write(struct udevice *dev, lbaint_t start, lbaint_t blkcnt,
* @dev: Device to (partially) erase (UCLASS_PARTITION) * @dev: Device to (partially) erase (UCLASS_PARTITION)
* @start: Start block number to erase in the partition (0=first) * @start: Start block number to erase in the partition (0=first)
* @blkcnt: Number of blocks to erase * @blkcnt: Number of blocks to erase
* Returns: number of blocks erased, or -ve error number (see the * Return: number of blocks erased, or -ve error number (see the
* IS_ERR_VALUE() macro * IS_ERR_VALUE() macro
*/ */
ulong disk_blk_erase(struct udevice *dev, lbaint_t start, lbaint_t blkcnt); ulong disk_blk_erase(struct udevice *dev, lbaint_t start, lbaint_t blkcnt);
@ -369,35 +378,40 @@ ulong disk_blk_erase(struct udevice *dev, lbaint_t start, lbaint_t blkcnt);
#define part_get_info_ptr(x) x #define part_get_info_ptr(x) x
#endif #endif
/**
* struct part_driver - partition driver
*/
struct part_driver { struct part_driver {
/** @name: partition name */
const char *name; const char *name;
/** @part_type: (MBR) partition type */
int part_type; int part_type;
const int max_entries; /* maximum number of entries to search */ /** @max_entries: maximum number of partition table entries */
const int max_entries;
/** /**
* get_info() - Get information about a partition * @get_info: Get information about a partition
* *
* @dev_desc: Block device descriptor * @get_info.dev_desc: Block device descriptor
* @part: Partition number (1 = first) * @get_info.part: Partition number (1 = first)
* @info: Returns partition information * @get_info.info: Returns partition information
*/ */
int (*get_info)(struct blk_desc *dev_desc, int part, int (*get_info)(struct blk_desc *dev_desc, int part,
struct disk_partition *info); struct disk_partition *info);
/** /**
* print() - Print partition information * @print: Print partition information
* *
* @dev_desc: Block device descriptor * @print.dev_desc: Block device descriptor
*/ */
void (*print)(struct blk_desc *dev_desc); void (*print)(struct blk_desc *dev_desc);
/** /**
* test() - Test if a device contains this partition type * @test: Test if a device contains this partition type
* *
* @dev_desc: Block device descriptor * @test.dev_desc: Block device descriptor
* @return 0 if the block device appears to contain this partition * @test.Return:
* type, -ve if not * 0 if the block device appears to contain this partition type,
* -ve if not
*/ */
int (*test)(struct blk_desc *dev_desc); int (*test)(struct blk_desc *dev_desc);
}; };
@ -413,52 +427,52 @@ struct part_driver {
/** /**
* write_gpt_table() - Write the GUID Partition Table to disk * write_gpt_table() - Write the GUID Partition Table to disk
* *
* @param dev_desc - block device descriptor * @dev_desc: block device descriptor
* @param gpt_h - pointer to GPT header representation * @gpt_h: pointer to GPT header representation
* @param gpt_e - pointer to GPT partition table entries * @gpt_e: pointer to GPT partition table entries
* *
* Return: - zero on success, otherwise error * Return: zero on success, otherwise error
*/ */
int write_gpt_table(struct blk_desc *dev_desc, int write_gpt_table(struct blk_desc *dev_desc,
gpt_header *gpt_h, gpt_entry *gpt_e); gpt_header *gpt_h, gpt_entry *gpt_e);
/** /**
* gpt_fill_pte(): Fill the GPT partition table entry * gpt_fill_pte() - Fill the GPT partition table entry
* *
* @param dev_desc - block device descriptor * @dev_desc: block device descriptor
* @param gpt_h - GPT header representation * @gpt_h: GPT header representation
* @param gpt_e - GPT partition table entries * @gpt_e: GPT partition table entries
* @param partitions - list of partitions * @partitions: list of partitions
* @param parts - number of partitions * @parts: number of partitions
* *
* Return: zero on success * Return: zero on success
*/ */
int gpt_fill_pte(struct blk_desc *dev_desc, int gpt_fill_pte(struct blk_desc *dev_desc,
gpt_header *gpt_h, gpt_entry *gpt_e, gpt_header *gpt_h, gpt_entry *gpt_e,
struct disk_partition *partitions, int parts); struct disk_partition *partitions, int parts);
/** /**
* gpt_fill_header(): Fill the GPT header * gpt_fill_header() - Fill the GPT header
* *
* @param dev_desc - block device descriptor * @dev_desc: block device descriptor
* @param gpt_h - GPT header representation * @gpt_h: GPT header representation
* @param str_guid - disk guid string representation * @str_guid: disk guid string representation
* @param parts_count - number of partitions * @parts_count: number of partitions
* *
* Return: - error on str_guid conversion error * Return: error on str_guid conversion error
*/ */
int gpt_fill_header(struct blk_desc *dev_desc, gpt_header *gpt_h, int gpt_fill_header(struct blk_desc *dev_desc, gpt_header *gpt_h,
char *str_guid, int parts_count); char *str_guid, int parts_count);
/** /**
* gpt_restore(): Restore GPT partition table * gpt_restore() - Restore GPT partition table
* *
* @param dev_desc - block device descriptor * @dev_desc: block device descriptor
* @param str_disk_guid - disk GUID * @str_disk_guid: disk GUID
* @param partitions - list of partitions * @partitions: list of partitions
* @param parts - number of partitions * @parts_count: number of partitions
* *
* Return: zero on success * Return: 0 on success
*/ */
int gpt_restore(struct blk_desc *dev_desc, char *str_disk_guid, int gpt_restore(struct blk_desc *dev_desc, char *str_disk_guid,
struct disk_partition *partitions, const int parts_count); struct disk_partition *partitions, const int parts_count);
@ -466,34 +480,34 @@ int gpt_restore(struct blk_desc *dev_desc, char *str_disk_guid,
/** /**
* is_valid_gpt_buf() - Ensure that the Primary GPT information is valid * is_valid_gpt_buf() - Ensure that the Primary GPT information is valid
* *
* @param dev_desc - block device descriptor * @dev_desc: block device descriptor
* @param buf - buffer which contains the MBR and Primary GPT info * @buf: buffer which contains the MBR and Primary GPT info
* *
* Return: - '0' on success, otherwise error * Return: 0 on success, otherwise error
*/ */
int is_valid_gpt_buf(struct blk_desc *dev_desc, void *buf); int is_valid_gpt_buf(struct blk_desc *dev_desc, void *buf);
/** /**
* write_mbr_and_gpt_partitions() - write MBR, Primary GPT and Backup GPT * write_mbr_and_gpt_partitions() - write MBR, Primary GPT and Backup GPT
* *
* @param dev_desc - block device descriptor * @dev_desc: block device descriptor
* @param buf - buffer which contains the MBR and Primary GPT info * @buf: buffer which contains the MBR and Primary GPT info
* *
* Return: - '0' on success, otherwise error * Return: 0 on success, otherwise error
*/ */
int write_mbr_and_gpt_partitions(struct blk_desc *dev_desc, void *buf); int write_mbr_and_gpt_partitions(struct blk_desc *dev_desc, void *buf);
/** /**
* gpt_verify_headers() - Function to read and CRC32 check of the GPT's header * gpt_verify_headers() - Read and check CRC32 of the GPT's header
* and partition table entries (PTE) * and partition table entries (PTE)
* *
* As a side effect if sets gpt_head and gpt_pte so they point to GPT data. * As a side effect if sets gpt_head and gpt_pte so they point to GPT data.
* *
* @param dev_desc - block device descriptor * @dev_desc: block device descriptor
* @param gpt_head - pointer to GPT header data read from medium * @gpt_head: pointer to GPT header data read from medium
* @param gpt_pte - pointer to GPT partition table enties read from medium * @gpt_pte: pointer to GPT partition table enties read from medium
* *
* Return: - '0' on success, otherwise error * Return: 0 on success, otherwise error
*/ */
int gpt_verify_headers(struct blk_desc *dev_desc, gpt_header *gpt_head, int gpt_verify_headers(struct blk_desc *dev_desc, gpt_header *gpt_head,
gpt_entry **gpt_pte); gpt_entry **gpt_pte);
@ -502,9 +516,9 @@ int gpt_verify_headers(struct blk_desc *dev_desc, gpt_header *gpt_head,
* gpt_repair_headers() - Function to repair the GPT's header * gpt_repair_headers() - Function to repair the GPT's header
* and partition table entries (PTE) * and partition table entries (PTE)
* *
* @param dev_desc - block device descriptor * @dev_desc: block device descriptor
* *
* Return: - '0' on success, otherwise error * Return: 0 on success, otherwise error
*/ */
int gpt_repair_headers(struct blk_desc *dev_desc); int gpt_repair_headers(struct blk_desc *dev_desc);
@ -516,13 +530,13 @@ int gpt_repair_headers(struct blk_desc *dev_desc);
* provided in '$partitions' environment variable. Specificially, name, start * provided in '$partitions' environment variable. Specificially, name, start
* and size of the partition is checked. * and size of the partition is checked.
* *
* @param dev_desc - block device descriptor * @dev_desc: block device descriptor
* @param partitions - partition data read from '$partitions' env variable * @partitions: partition data read from '$partitions' env variable
* @param parts - number of partitions read from '$partitions' env variable * @parts: number of partitions read from '$partitions' env variable
* @param gpt_head - pointer to GPT header data read from medium * @gpt_head: pointer to GPT header data read from medium
* @param gpt_pte - pointer to GPT partition table enties read from medium * @gpt_pte: pointer to GPT partition table enties read from medium
* *
* Return: - '0' on success, otherwise error * Return: 0 on success, otherwise error
*/ */
int gpt_verify_partitions(struct blk_desc *dev_desc, int gpt_verify_partitions(struct blk_desc *dev_desc,
struct disk_partition *partitions, int parts, struct disk_partition *partitions, int parts,
@ -530,15 +544,15 @@ int gpt_verify_partitions(struct blk_desc *dev_desc,
/** /**
* get_disk_guid() - Function to read the GUID string from a device's GPT * get_disk_guid() - Read the GUID string from a device's GPT
* *
* This function reads the GUID string from a block device whose descriptor * This function reads the GUID string from a block device whose descriptor
* is provided. * is provided.
* *
* @param dev_desc - block device descriptor * @dev_desc: block device descriptor
* @param guid - pre-allocated string in which to return the GUID * @guid: pre-allocated string in which to return the GUID
* *
* Return: - '0' on success, otherwise error * Return: 0 on success, otherwise error
*/ */
int get_disk_guid(struct blk_desc *dev_desc, char *guid); int get_disk_guid(struct blk_desc *dev_desc, char *guid);
@ -548,19 +562,19 @@ int get_disk_guid(struct blk_desc *dev_desc, char *guid);
/** /**
* is_valid_dos_buf() - Ensure that a DOS MBR image is valid * is_valid_dos_buf() - Ensure that a DOS MBR image is valid
* *
* @param buf - buffer which contains the MBR * @buf: buffer which contains the MBR
* *
* Return: - '0' on success, otherwise error * Return: 0 on success, otherwise error
*/ */
int is_valid_dos_buf(void *buf); int is_valid_dos_buf(void *buf);
/** /**
* write_mbr_sector() - write DOS MBR * write_mbr_sector() - write DOS MBR
* *
* @param dev_desc - block device descriptor * @dev_desc: block device descriptor
* @param buf - buffer which contains the MBR * @buf: buffer which contains the MBR
* *
* Return: - '0' on success, otherwise error * Return: 0 on success, otherwise error
*/ */
int write_mbr_sector(struct blk_desc *dev_desc, void *buf); int write_mbr_sector(struct blk_desc *dev_desc, void *buf);
@ -575,7 +589,7 @@ int layout_mbr_partitions(struct disk_partition *p, int count,
/** /**
* part_driver_get_count() - get partition driver count * part_driver_get_count() - get partition driver count
* *
* Return: - number of partition drivers * Return: number of partition drivers
*/ */
static inline int part_driver_get_count(void) static inline int part_driver_get_count(void)
{ {
@ -585,7 +599,7 @@ static inline int part_driver_get_count(void)
/** /**
* part_driver_get_first() - get first partition driver * part_driver_get_first() - get first partition driver
* *
* Return: - pointer to first partition driver on success, otherwise NULL * Return: pointer to first partition driver on success, otherwise NULL
*/ */
static inline struct part_driver *part_driver_get_first(void) static inline struct part_driver *part_driver_get_first(void)
{ {
@ -595,9 +609,9 @@ static inline struct part_driver *part_driver_get_first(void)
/** /**
* part_get_type_by_name() - Get partition type by name * part_get_type_by_name() - Get partition type by name
* *
* @name: Name of partition type to look up (not case-sensitive) * @name: Name of partition type to look up (not case-sensitive)
* Returns: Corresponding partition type (PART_TYPE_...) or PART_TYPE_UNKNOWN if * Return:
* not known * Corresponding partition type (PART\_TYPE\_...) or PART\_TYPE\_UNKNOWN
*/ */
int part_get_type_by_name(const char *name); int part_get_type_by_name(const char *name);