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linux/arch/powerpc/include/asm/rtas.h
sukadev@linux.vnet.ibm.com 8a3e3d31d1 powerpc: Punch a hole in /dev/mem for librtas 
With CONFIG_STRICT_DEVMEM=y, user space cannot read any part of /dev/mem.
Since this breaks librtas, punch a hole in /dev/mem to allow access to the
rmo_buffer that librtas needs.

Anton Blanchard reported the problem and helped with the fix.

A quick test for this patch:

       # cat /proc/rtas/rmo_buffer
       000000000f190000 10000

       # python -c "print 0x000000000f190000 / 0x10000"
       3865

       # dd if=/dev/mem of=/tmp/foo count=1 bs=64k skip=3865
       1+0 records in
       1+0 records out
       65536 bytes (66 kB) copied, 0.000205235 s, 319 MB/s

       # dd if=/dev/mem of=/tmp/foo
       dd: reading `/dev/mem': Operation not permitted
       0+0 records in
       0+0 records out
       0 bytes (0 B) copied, 0.00022519 s, 0.0 kB/s

Signed-off-by: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2011-12-08 14:22:52 +11:00

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#ifndef _POWERPC_RTAS_H
#define _POWERPC_RTAS_H
#ifdef __KERNEL__
#include <linux/spinlock.h>
#include <asm/page.h>
/*
* Definitions for talking to the RTAS on CHRP machines.
*
* Copyright (C) 2001 Peter Bergner
* Copyright (C) 2001 PPC 64 Team, IBM Corp
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
#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 u32 rtas_arg_t;
struct rtas_args {
u32 token;
u32 nargs;
u32 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_POWERMGM_EVENTS 0x20000000 /* set bit 2 */
#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
/* 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
/* RTAS check-exception vector offset */
#define RTAS_VECTOR_EXTERNAL_INTERRUPT 0x500
struct rtas_error_log {
unsigned long version:8; /* Architectural version */
unsigned long severity:3; /* Severity level of error */
unsigned long disposition:2; /* Degree of recovery */
unsigned long extended:1; /* extended log present? */
unsigned long /* reserved */ :2; /* Reserved for future use */
unsigned long initiator:4; /* Initiator of event */
unsigned long target:4; /* Target of failed operation */
unsigned long type:8; /* General event or error*/
unsigned long extended_log_length:32; /* length in bytes */
unsigned char buffer[1]; /* Start of extended log */
/* Variable 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 */
uint32_t log_valid:1; /* 1:Log valid */
uint32_t unrecoverable_error:1; /* 1:Unrecoverable error */
uint32_t recoverable_error:1; /* 1:recoverable (correctable */
/* or successfully retried) */
uint32_t degraded_operation:1; /* 1:Unrecoverable err, bypassed*/
/* - degraded operation (e.g. */
/* CPU or mem taken off-line) */
uint32_t predictive_error:1;
uint32_t new_log:1; /* 1:"New" log (Always 1 for */
/* data returned from RTAS */
uint32_t big_endian:1; /* 1: Big endian */
uint32_t :1; /* reserved */
/* Byte 1 */
uint32_t :8; /* reserved */
/* Byte 2 */
uint32_t powerpc_format:1; /* Set to 1 (indicating log is */
/* in PowerPC format */
uint32_t :3; /* reserved */
uint32_t log_format:4; /* Log format indicator. Define */
/* format used for byte 12-2047 */
/* Byte 3 */
uint32_t :8; /* reserved */
/* Byte 4-11 */
uint8_t reserved[8]; /* reserved */
/* Byte 12-15 */
uint32_t 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. */
};
/*
* 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 void enter_rtas(unsigned long);
extern int rtas_token(const char *service);
extern int rtas_service_present(const char *service);
extern int rtas_call(int token, int, int, int *, ...);
extern void rtas_restart(char *cmd);
extern void rtas_power_off(void);
extern void 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_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 void rtas_initialize(void);
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_ibm_suspend_me(struct rtas_args *);
struct rtc_time;
extern unsigned long 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_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 __cpuinit rtas_give_timebase(void);
extern void __cpuinit 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;
}
#else
static inline int page_is_rtas_user_buf(unsigned long pfn) { return 0;}
#endif
#endif /* __KERNEL__ */
#endif /* _POWERPC_RTAS_H */
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