include/uapi/linux/mmc/ioctl.h

Source file repositories/reference/linux-study-clean/include/uapi/linux/mmc/ioctl.h

File Facts

System
Linux kernel
Corpus path
include/uapi/linux/mmc/ioctl.h
Extension
.h
Size
2355 bytes
Lines
80
Domain
Core OS
Bucket
Core Kernel Interface
Inferred role
Core OS: implementation source
Status
source implementation candidate

Why This File Exists

Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.

Dependency Surface

Detected Declarations

Annotated Snippet

struct mmc_ioc_cmd {
	/*
	 * Direction of data: nonzero = write, zero = read.
	 * Bit 31 selects 'Reliable Write' for RPMB.
	 */
	int write_flag;

	/* Application-specific command.  true = precede with CMD55 */
	int is_acmd;

	__u32 opcode;
	__u32 arg;
	__u32 response[4];  /* CMD response */
	unsigned int flags;
	unsigned int blksz;
	unsigned int blocks;

	/*
	 * Sleep at least postsleep_min_us useconds, and at most
	 * postsleep_max_us useconds *after* issuing command.  Needed for
	 * some read commands for which cards have no other way of indicating
	 * they're ready for the next command (i.e. there is no equivalent of
	 * a "busy" indicator for read operations).
	 */
	unsigned int postsleep_min_us;
	unsigned int postsleep_max_us;

	/*
	 * Override driver-computed timeouts.  Note the difference in units!
	 */
	unsigned int data_timeout_ns;
	unsigned int cmd_timeout_ms;

	/*
	 * For 64-bit machines, the next member, ``__u64 data_ptr``, wants to
	 * be 8-byte aligned.  Make sure this struct is the same size when
	 * built for 32-bit.
	 */
	__u32 __pad;

	/* DAT buffer */
	__u64 data_ptr;
};
#define mmc_ioc_cmd_set_data(ic, ptr) ic.data_ptr = (__u64)(unsigned long) ptr

/**
 * struct mmc_ioc_multi_cmd - multi command information
 * @num_of_cmds: Number of commands to send. Must be equal to or less than
 *	MMC_IOC_MAX_CMDS.
 * @cmds: Array of commands with length equal to 'num_of_cmds'
 */
struct mmc_ioc_multi_cmd {
	__u64 num_of_cmds;
	struct mmc_ioc_cmd cmds[];
};

#define MMC_IOC_CMD _IOWR(MMC_BLOCK_MAJOR, 0, struct mmc_ioc_cmd)
/*
 * MMC_IOC_MULTI_CMD: Used to send an array of MMC commands described by
 *	the structure mmc_ioc_multi_cmd. The MMC driver will issue all
 *	commands in array in sequence to card.
 */
#define MMC_IOC_MULTI_CMD _IOWR(MMC_BLOCK_MAJOR, 1, struct mmc_ioc_multi_cmd)
/*
 * Since this ioctl is only meant to enhance (and not replace) normal access
 * to the mmc bus device, an upper data transfer limit of MMC_IOC_MAX_BYTES
 * is enforced per ioctl call.  For larger data transfers, use the normal
 * block device operations.
 */
#define MMC_IOC_MAX_BYTES  (512L * 1024)
#define MMC_IOC_MAX_CMDS    255
#endif /* LINUX_MMC_IOCTL_H */

Annotation

Implementation Notes