arch/powerpc/include/asm/rtas.h

/* SPDX-License-Identifier: GPL-2.0-or-later */
#ifndef _POWERPC_RTAS_H
#define _POWERPC_RTAS_H
#ifdef __KERNEL__

#include <linux/spinlock.h>
#include <asm/page.h>
#include <linux/time.h>
#include <linux/cpumask.h>

/*
 * Definitions for talking to the RTAS on CHRP machines.
 *
 * Copyright (C) 2001 Peter Bergner
 * Copyright (C) 2001 PPC 64 Team, IBM Corp
 */

#define RTAS_UNKNOWN_SERVICE (-1)
#define RTAS_INSTANTIATE_MAX (1ULL<<30) /* Don't instantiate rtas at/above this value */

/* Buffer size for ppc_rtas system call. */
#define RTAS_RMOBUF_MAX (64 * 1024)

/* RTAS return status codes */
#define RTAS_NOT_SUSPENDABLE	-9004
#define RTAS_BUSY		-2    /* RTAS Busy */
#define RTAS_EXTENDED_DELAY_MIN	9900
#define RTAS_EXTENDED_DELAY_MAX	9905

/*
 * In general to call RTAS use rtas_token("string") to lookup
 * an RTAS token for the given string (e.g. "event-scan").
 * To actually perform the call use
 *    ret = rtas_call(token, n_in, n_out, ...)
 * Where n_in is the number of input parameters and
 *       n_out is the number of output parameters
 *
 * If the "string" is invalid on this system, RTAS_UNKNOWN_SERVICE
 * will be returned as a token.  rtas_call() does look for this
 * token and error out gracefully so rtas_call(rtas_token("str"), ...)
 * may be safely used for one-shot calls to RTAS.
 *
 */

typedef __be32 rtas_arg_t;

struct rtas_args {
	__be32 token;
	__be32 nargs;
	__be32 nret; 
	rtas_arg_t args[16];
	rtas_arg_t *rets;     /* Pointer to return values in args[]. */
};  

struct rtas_t {
	unsigned long entry;		/* physical address pointer */
	unsigned long base;		/* physical address pointer */
	unsigned long size;
	arch_spinlock_t lock;
	struct rtas_args args;
	struct device_node *dev;	/* virtual address pointer */
};

struct rtas_suspend_me_data {
	atomic_t working; /* number of cpus accessing this struct */
	atomic_t done;
	int token; /* ibm,suspend-me */
	atomic_t error;
	struct completion *complete; /* wait on this until working == 0 */
};

/* RTAS event classes */
#define RTAS_INTERNAL_ERROR		0x80000000 /* set bit 0 */
#define RTAS_EPOW_WARNING		0x40000000 /* set bit 1 */
#define RTAS_HOTPLUG_EVENTS		0x10000000 /* set bit 3 */
#define RTAS_IO_EVENTS			0x08000000 /* set bit 4 */
#define RTAS_EVENT_SCAN_ALL_EVENTS	0xffffffff

/* RTAS event severity */
#define RTAS_SEVERITY_FATAL		0x5
#define RTAS_SEVERITY_ERROR		0x4
#define RTAS_SEVERITY_ERROR_SYNC	0x3
#define RTAS_SEVERITY_WARNING		0x2
#define RTAS_SEVERITY_EVENT		0x1
#define RTAS_SEVERITY_NO_ERROR		0x0

/* RTAS event disposition */
#define RTAS_DISP_FULLY_RECOVERED	0x0
#define RTAS_DISP_LIMITED_RECOVERY	0x1
#define RTAS_DISP_NOT_RECOVERED		0x2

/* RTAS event initiator */
#define RTAS_INITIATOR_UNKNOWN		0x0
#define RTAS_INITIATOR_CPU		0x1
#define RTAS_INITIATOR_PCI		0x2
#define RTAS_INITIATOR_ISA		0x3
#define RTAS_INITIATOR_MEMORY		0x4
#define RTAS_INITIATOR_POWERMGM		0x5

/* RTAS event target */
#define RTAS_TARGET_UNKNOWN		0x0
#define RTAS_TARGET_CPU			0x1
#define RTAS_TARGET_PCI			0x2
#define RTAS_TARGET_ISA			0x3
#define RTAS_TARGET_MEMORY		0x4
#define RTAS_TARGET_POWERMGM		0x5

/* RTAS event type */
#define RTAS_TYPE_RETRY			0x01
#define RTAS_TYPE_TCE_ERR		0x02
#define RTAS_TYPE_INTERN_DEV_FAIL	0x03
#define RTAS_TYPE_TIMEOUT		0x04
#define RTAS_TYPE_DATA_PARITY		0x05
#define RTAS_TYPE_ADDR_PARITY		0x06
#define RTAS_TYPE_CACHE_PARITY		0x07
#define RTAS_TYPE_ADDR_INVALID		0x08
#define RTAS_TYPE_ECC_UNCORR		0x09
#define RTAS_TYPE_ECC_CORR		0x0a
#define RTAS_TYPE_EPOW			0x40
#define RTAS_TYPE_PLATFORM		0xE0
#define RTAS_TYPE_IO			0xE1
#define RTAS_TYPE_INFO			0xE2
#define RTAS_TYPE_DEALLOC		0xE3
#define RTAS_TYPE_DUMP			0xE4
#define RTAS_TYPE_HOTPLUG		0xE5
/* I don't add PowerMGM events right now, this is a different topic */ 
#define RTAS_TYPE_PMGM_POWER_SW_ON	0x60
#define RTAS_TYPE_PMGM_POWER_SW_OFF	0x61
#define RTAS_TYPE_PMGM_LID_OPEN		0x62
#define RTAS_TYPE_PMGM_LID_CLOSE	0x63
#define RTAS_TYPE_PMGM_SLEEP_BTN	0x64
#define RTAS_TYPE_PMGM_WAKE_BTN		0x65
#define RTAS_TYPE_PMGM_BATTERY_WARN	0x66
#define RTAS_TYPE_PMGM_BATTERY_CRIT	0x67
#define RTAS_TYPE_PMGM_SWITCH_TO_BAT	0x68
#define RTAS_TYPE_PMGM_SWITCH_TO_AC	0x69
#define RTAS_TYPE_PMGM_KBD_OR_MOUSE	0x6a
#define RTAS_TYPE_PMGM_ENCLOS_OPEN	0x6b
#define RTAS_TYPE_PMGM_ENCLOS_CLOSED	0x6c
#define RTAS_TYPE_PMGM_RING_INDICATE	0x6d
#define RTAS_TYPE_PMGM_LAN_ATTENTION	0x6e
#define RTAS_TYPE_PMGM_TIME_ALARM	0x6f
#define RTAS_TYPE_PMGM_CONFIG_CHANGE	0x70
#define RTAS_TYPE_PMGM_SERVICE_PROC	0x71
/* Platform Resource Reassignment Notification */
#define RTAS_TYPE_PRRN			0xA0

/* RTAS check-exception vector offset */
#define RTAS_VECTOR_EXTERNAL_INTERRUPT	0x500

struct rtas_error_log {
	/* Byte 0 */
	uint8_t		byte0;			/* Architectural version */

	/* Byte 1 */
	uint8_t		byte1;
	/* XXXXXXXX
	 * XXX		3: Severity level of error
	 *    XX	2: Degree of recovery
	 *      X	1: Extended log present?
	 *       XX	2: Reserved
	 */

	/* Byte 2 */
	uint8_t		byte2;
	/* XXXXXXXX
	 * XXXX		4: Initiator of event
	 *     XXXX	4: Target of failed operation
	 */
	uint8_t		byte3;			/* General event or error*/
	__be32		extended_log_length;	/* length in bytes */
	unsigned char	buffer[1];		/* Start of extended log */
						/* Variable length.      */
};

static inline uint8_t rtas_error_severity(const struct rtas_error_log *elog)
{
	return (elog->byte1 & 0xE0) >> 5;
}

static inline uint8_t rtas_error_disposition(const struct rtas_error_log *elog)
{
	return (elog->byte1 & 0x18) >> 3;
}

static inline
void rtas_set_disposition_recovered(struct rtas_error_log *elog)
{
	elog->byte1 &= ~0x18;
	elog->byte1 |= (RTAS_DISP_FULLY_RECOVERED << 3);
}

static inline uint8_t rtas_error_extended(const struct rtas_error_log *elog)
{
	return (elog->byte1 & 0x04) >> 2;
}

static inline uint8_t rtas_error_initiator(const struct rtas_error_log *elog)
{
	return (elog->byte2 & 0xf0) >> 4;
}

#define rtas_error_type(x)	((x)->byte3)

static inline
uint32_t rtas_error_extended_log_length(const struct rtas_error_log *elog)
{
	return be32_to_cpu(elog->extended_log_length);
}

#define RTAS_V6EXT_LOG_FORMAT_EVENT_LOG	14

#define RTAS_V6EXT_COMPANY_ID_IBM	(('I' << 24) | ('B' << 16) | ('M' << 8))

/* RTAS general extended event log, Version 6. The extended log starts
 * from "buffer" field of struct rtas_error_log defined above.
 */
struct rtas_ext_event_log_v6 {
	/* Byte 0 */
	uint8_t byte0;
	/* XXXXXXXX
	 * X		1: Log valid
	 *  X		1: Unrecoverable error
	 *   X		1: Recoverable (correctable or successfully retried)
	 *    X		1: Bypassed unrecoverable error (degraded operation)
	 *     X	1: Predictive error
	 *      X	1: "New" log (always 1 for data returned from RTAS)
	 *       X	1: Big Endian
	 *        X	1: Reserved
	 */

	/* Byte 1 */
	uint8_t byte1;			/* reserved */

	/* Byte 2 */
	uint8_t byte2;
	/* XXXXXXXX
	 * X		1: Set to 1 (indicating log is in PowerPC format)
	 *  XXX		3: Reserved
	 *     XXXX	4: Log format used for bytes 12-2047
	 */

	/* Byte 3 */
	uint8_t byte3;			/* reserved */
	/* Byte 4-11 */
	uint8_t reserved[8];		/* reserved */
	/* Byte 12-15 */
	__be32  company_id;		/* Company ID of the company	*/
					/* that defines the format for	*/
					/* the vendor specific log type	*/
	/* Byte 16-end of log */
	uint8_t vendor_log[1];		/* Start of vendor specific log	*/
					/* Variable length.		*/
};

static
inline uint8_t rtas_ext_event_log_format(struct rtas_ext_event_log_v6 *ext_log)
{
	return ext_log->byte2 & 0x0F;
}

static
inline uint32_t rtas_ext_event_company_id(struct rtas_ext_event_log_v6 *ext_log)
{
	return be32_to_cpu(ext_log->company_id);
}

/* pSeries event log format */

/* Two bytes ASCII section IDs */
#define PSERIES_ELOG_SECT_ID_PRIV_HDR		(('P' << 8) | 'H')
#define PSERIES_ELOG_SECT_ID_USER_HDR		(('U' << 8) | 'H')
#define PSERIES_ELOG_SECT_ID_PRIMARY_SRC	(('P' << 8) | 'S')
#define PSERIES_ELOG_SECT_ID_EXTENDED_UH	(('E' << 8) | 'H')
#define PSERIES_ELOG_SECT_ID_FAILING_MTMS	(('M' << 8) | 'T')
#define PSERIES_ELOG_SECT_ID_SECONDARY_SRC	(('S' << 8) | 'S')
#define PSERIES_ELOG_SECT_ID_DUMP_LOCATOR	(('D' << 8) | 'H')
#define PSERIES_ELOG_SECT_ID_FW_ERROR		(('S' << 8) | 'W')
#define PSERIES_ELOG_SECT_ID_IMPACT_PART_ID	(('L' << 8) | 'P')
#define PSERIES_ELOG_SECT_ID_LOGIC_RESOURCE_ID	(('L' << 8) | 'R')
#define PSERIES_ELOG_SECT_ID_HMC_ID		(('H' << 8) | 'M')
#define PSERIES_ELOG_SECT_ID_EPOW		(('E' << 8) | 'P')
#define PSERIES_ELOG_SECT_ID_IO_EVENT		(('I' << 8) | 'E')
#define PSERIES_ELOG_SECT_ID_MANUFACT_INFO	(('M' << 8) | 'I')
#define PSERIES_ELOG_SECT_ID_CALL_HOME		(('C' << 8) | 'H')
#define PSERIES_ELOG_SECT_ID_USER_DEF		(('U' << 8) | 'D')
#define PSERIES_ELOG_SECT_ID_HOTPLUG		(('H' << 8) | 'P')
#define PSERIES_ELOG_SECT_ID_MCE		(('M' << 8) | 'C')

/* Vendor specific Platform Event Log Format, Version 6, section header */
struct pseries_errorlog {
	__be16 id;			/* 0x00 2-byte ASCII section ID	*/
	__be16 length;			/* 0x02 Section length in bytes	*/
	uint8_t version;		/* 0x04 Section version		*/
	uint8_t subtype;		/* 0x05 Section subtype		*/
	__be16 creator_component;	/* 0x06 Creator component ID	*/
	uint8_t data[];			/* 0x08 Start of section data	*/
};

static
inline uint16_t pseries_errorlog_id(struct pseries_errorlog *sect)
{
	return be16_to_cpu(sect->id);
}

static
inline uint16_t pseries_errorlog_length(struct pseries_errorlog *sect)
{
	return be16_to_cpu(sect->length);
}

/* RTAS pseries hotplug errorlog section */
struct pseries_hp_errorlog {
	u8	resource;
	u8	action;
	u8	id_type;
	u8	reserved;
	union {
		__be32	drc_index;
		__be32	drc_count;
		struct { __be32 count, index; } ic;
		char	drc_name[1];
	} _drc_u;
};

#define PSERIES_HP_ELOG_RESOURCE_CPU	1
#define PSERIES_HP_ELOG_RESOURCE_MEM	2
#define PSERIES_HP_ELOG_RESOURCE_SLOT	3
#define PSERIES_HP_ELOG_RESOURCE_PHB	4
#define PSERIES_HP_ELOG_RESOURCE_PMEM   6

#define PSERIES_HP_ELOG_ACTION_ADD	1
#define PSERIES_HP_ELOG_ACTION_REMOVE	2
#define PSERIES_HP_ELOG_ACTION_READD	3

#define PSERIES_HP_ELOG_ID_DRC_NAME	1
#define PSERIES_HP_ELOG_ID_DRC_INDEX	2
#define PSERIES_HP_ELOG_ID_DRC_COUNT	3
#define PSERIES_HP_ELOG_ID_DRC_IC	4

struct pseries_errorlog *get_pseries_errorlog(struct rtas_error_log *log,
					      uint16_t section_id);

/*
 * This can be set by the rtas_flash module so that it can get called
 * as the absolutely last thing before the kernel terminates.
 */
extern void (*rtas_flash_term_hook)(int);

extern struct rtas_t rtas;

extern int rtas_token(const char *service);
extern int rtas_service_present(const char *service);
extern int rtas_call(int token, int, int, int *, ...);
void rtas_call_unlocked(struct rtas_args *args, int token, int nargs,
			int nret, ...);
extern void __noreturn rtas_restart(char *cmd);
extern void rtas_power_off(void);
extern void __noreturn rtas_halt(void);
extern void rtas_os_term(char *str);
extern int rtas_get_sensor(int sensor, int index, int *state);
extern int rtas_get_sensor_fast(int sensor, int index, int *state);
extern int rtas_get_power_level(int powerdomain, int *level);
extern int rtas_set_power_level(int powerdomain, int level, int *setlevel);
extern bool rtas_indicator_present(int token, int *maxindex);
extern int rtas_set_indicator(int indicator, int index, int new_value);
extern int rtas_set_indicator_fast(int indicator, int index, int new_value);
extern void rtas_progress(char *s, unsigned short hex);
extern int rtas_suspend_cpu(struct rtas_suspend_me_data *data);
extern int rtas_suspend_last_cpu(struct rtas_suspend_me_data *data);
extern int rtas_online_cpus_mask(cpumask_var_t cpus);
extern int rtas_offline_cpus_mask(cpumask_var_t cpus);
extern int rtas_ibm_suspend_me(u64 handle);

struct rtc_time;
extern time64_t rtas_get_boot_time(void);
extern void rtas_get_rtc_time(struct rtc_time *rtc_time);
extern int rtas_set_rtc_time(struct rtc_time *rtc_time);

extern unsigned int rtas_busy_delay_time(int status);
extern unsigned int rtas_busy_delay(int status);

extern int early_init_dt_scan_rtas(unsigned long node,
		const char *uname, int depth, void *data);

extern void pSeries_log_error(char *buf, unsigned int err_type, int fatal);

#ifdef CONFIG_PPC_PSERIES
extern time64_t last_rtas_event;
extern int clobbering_unread_rtas_event(void);
extern int pseries_devicetree_update(s32 scope);
extern void post_mobility_fixup(void);
#else
static inline int clobbering_unread_rtas_event(void) { return 0; }
#endif

#ifdef CONFIG_PPC_RTAS_DAEMON
extern void rtas_cancel_event_scan(void);
#else
static inline void rtas_cancel_event_scan(void) { }
#endif

/* Error types logged.  */
#define ERR_FLAG_ALREADY_LOGGED	0x0
#define ERR_FLAG_BOOT		0x1 	/* log was pulled from NVRAM on boot */
#define ERR_TYPE_RTAS_LOG	0x2	/* from rtas event-scan */
#define ERR_TYPE_KERNEL_PANIC	0x4	/* from die()/panic() */
#define ERR_TYPE_KERNEL_PANIC_GZ 0x8	/* ditto, compressed */

/* All the types and not flags */
#define ERR_TYPE_MASK \
	(ERR_TYPE_RTAS_LOG | ERR_TYPE_KERNEL_PANIC | ERR_TYPE_KERNEL_PANIC_GZ)

#define RTAS_DEBUG KERN_DEBUG "RTAS: "
 
#define RTAS_ERROR_LOG_MAX 2048

/*
 * Return the firmware-specified size of the error log buffer
 *  for all rtas calls that require an error buffer argument.
 *  This includes 'check-exception' and 'rtas-last-error'.
 */
extern int rtas_get_error_log_max(void);

/* Event Scan Parameters */
#define EVENT_SCAN_ALL_EVENTS	0xf0000000
#define SURVEILLANCE_TOKEN	9000
#define LOG_NUMBER		64		/* must be a power of two */
#define LOG_NUMBER_MASK		(LOG_NUMBER-1)

/* Some RTAS ops require a data buffer and that buffer must be < 4G.
 * Rather than having a memory allocator, just use this buffer
 * (get the lock first), make the RTAS call.  Copy the data instead
 * of holding the buffer for long.
 */

#define RTAS_DATA_BUF_SIZE 4096
extern spinlock_t rtas_data_buf_lock;
extern char rtas_data_buf[RTAS_DATA_BUF_SIZE];

/* RMO buffer reserved for user-space RTAS use */
extern unsigned long rtas_rmo_buf;

#define GLOBAL_INTERRUPT_QUEUE 9005

/**
 * rtas_config_addr - Format a busno, devfn and reg for RTAS.
 * @busno: The bus number.
 * @devfn: The device and function number as encoded by PCI_DEVFN().
 * @reg: The register number.
 *
 * This function encodes the given busno, devfn and register number as
 * required for RTAS calls that take a "config_addr" parameter.
 * See PAPR requirement 7.3.4-1 for more info.
 */
static inline u32 rtas_config_addr(int busno, int devfn, int reg)
{
	return ((reg & 0xf00) << 20) | ((busno & 0xff) << 16) |
			(devfn << 8) | (reg & 0xff);
}

extern void rtas_give_timebase(void);
extern void rtas_take_timebase(void);

#ifdef CONFIG_PPC_RTAS
static inline int page_is_rtas_user_buf(unsigned long pfn)
{
	unsigned long paddr = (pfn << PAGE_SHIFT);
	if (paddr >= rtas_rmo_buf && paddr < (rtas_rmo_buf + RTAS_RMOBUF_MAX))
		return 1;
	return 0;
}

/* Not the best place to put pSeries_coalesce_init, will be fixed when we
 * move some of the rtas suspend-me stuff to pseries */
extern void pSeries_coalesce_init(void);
void rtas_initialize(void);
#else
static inline int page_is_rtas_user_buf(unsigned long pfn) { return 0;}
static inline void pSeries_coalesce_init(void) { }
static inline void rtas_initialize(void) { };
#endif

extern int call_rtas(const char *, int, int, unsigned long *, ...);

#endif /* __KERNEL__ */
#endif /* _POWERPC_RTAS_H */