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/* SPDX-License-Identifier: GPL-2.0-only */
#ifndef _ASM_POWERPC_PAPR_RTAS_COMMON_H
#define _ASM_POWERPC_PAPR_RTAS_COMMON_H
#include <linux/types.h>
/*
* Return codes for sequence based RTAS calls.
* Not listed under PAPR+ v2.13 7.2.8: "Return Codes".
* But defined in the specific section of each RTAS call.
*/
#define RTAS_SEQ_COMPLETE 0 /* All data has been retrieved. */
#define RTAS_SEQ_MORE_DATA 1 /* More data is available */
#define RTAS_SEQ_START_OVER -4 /* Data changed, restart call sequence. */
/*
* Internal "blob" APIs for accumulating RTAS call results into
* an immutable buffer to be attached to a file descriptor.
*/
struct papr_rtas_blob {
const char *data;
size_t len;
};
/**
* struct papr_sequence - State for managing a sequence of RTAS calls.
* @error: Shall be zero as long as the sequence has not encountered an error,
* -ve errno otherwise. Use papr_rtas_sequence_set_err() to update.
* @params: Parameter block to pass to rtas_*() calls.
* @begin: Work area allocation and initialize the needed parameter
* values passed to RTAS call
* @end: Free the allocated work area
* @work: Obtain data with RTAS call and invoke it until the sequence is
* completed.
*
*/
struct papr_rtas_sequence {
int error;
void *params;
void (*begin)(struct papr_rtas_sequence *seq);
void (*end)(struct papr_rtas_sequence *seq);
const char *(*work)(struct papr_rtas_sequence *seq, size_t *len);
};
extern bool papr_rtas_blob_has_data(const struct papr_rtas_blob *blob);
extern void papr_rtas_blob_free(const struct papr_rtas_blob *blob);
extern int papr_rtas_sequence_set_err(struct papr_rtas_sequence *seq,
int err);
extern const struct papr_rtas_blob *papr_rtas_retrieve(struct papr_rtas_sequence *seq);
extern long papr_rtas_setup_file_interface(struct papr_rtas_sequence *seq,
const struct file_operations *fops, char *name);
extern bool papr_rtas_sequence_should_stop(const struct papr_rtas_sequence *seq,
s32 status, bool init_state);
extern ssize_t papr_rtas_common_handle_read(struct file *file,
char __user *buf, size_t size, loff_t *off);
extern int papr_rtas_common_handle_release(struct inode *inode,
struct file *file);
extern loff_t papr_rtas_common_handle_seek(struct file *file, loff_t off,
int whence);
#endif /* _ASM_POWERPC_PAPR_RTAS_COMMON_H */
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