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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-26 03:45:40 +07:00
8a3e3d31d1
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>
330 lines
11 KiB
C
330 lines
11 KiB
C
#ifndef _POWERPC_RTAS_H
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#define _POWERPC_RTAS_H
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#ifdef __KERNEL__
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#include <linux/spinlock.h>
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#include <asm/page.h>
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/*
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* Definitions for talking to the RTAS on CHRP machines.
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*
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* Copyright (C) 2001 Peter Bergner
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* Copyright (C) 2001 PPC 64 Team, IBM Corp
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#define RTAS_UNKNOWN_SERVICE (-1)
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#define RTAS_INSTANTIATE_MAX (1ULL<<30) /* Don't instantiate rtas at/above this value */
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/* Buffer size for ppc_rtas system call. */
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#define RTAS_RMOBUF_MAX (64 * 1024)
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/* RTAS return status codes */
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#define RTAS_NOT_SUSPENDABLE -9004
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#define RTAS_BUSY -2 /* RTAS Busy */
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#define RTAS_EXTENDED_DELAY_MIN 9900
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#define RTAS_EXTENDED_DELAY_MAX 9905
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/*
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* In general to call RTAS use rtas_token("string") to lookup
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* an RTAS token for the given string (e.g. "event-scan").
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* To actually perform the call use
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* ret = rtas_call(token, n_in, n_out, ...)
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* Where n_in is the number of input parameters and
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* n_out is the number of output parameters
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*
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* If the "string" is invalid on this system, RTAS_UNKNOWN_SERVICE
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* will be returned as a token. rtas_call() does look for this
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* token and error out gracefully so rtas_call(rtas_token("str"), ...)
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* may be safely used for one-shot calls to RTAS.
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*
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*/
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typedef u32 rtas_arg_t;
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struct rtas_args {
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u32 token;
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u32 nargs;
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u32 nret;
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rtas_arg_t args[16];
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rtas_arg_t *rets; /* Pointer to return values in args[]. */
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};
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struct rtas_t {
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unsigned long entry; /* physical address pointer */
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unsigned long base; /* physical address pointer */
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unsigned long size;
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arch_spinlock_t lock;
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struct rtas_args args;
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struct device_node *dev; /* virtual address pointer */
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};
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struct rtas_suspend_me_data {
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atomic_t working; /* number of cpus accessing this struct */
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atomic_t done;
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int token; /* ibm,suspend-me */
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atomic_t error;
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struct completion *complete; /* wait on this until working == 0 */
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};
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/* RTAS event classes */
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#define RTAS_INTERNAL_ERROR 0x80000000 /* set bit 0 */
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#define RTAS_EPOW_WARNING 0x40000000 /* set bit 1 */
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#define RTAS_POWERMGM_EVENTS 0x20000000 /* set bit 2 */
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#define RTAS_HOTPLUG_EVENTS 0x10000000 /* set bit 3 */
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#define RTAS_IO_EVENTS 0x08000000 /* set bit 4 */
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#define RTAS_EVENT_SCAN_ALL_EVENTS 0xffffffff
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/* RTAS event severity */
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#define RTAS_SEVERITY_FATAL 0x5
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#define RTAS_SEVERITY_ERROR 0x4
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#define RTAS_SEVERITY_ERROR_SYNC 0x3
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#define RTAS_SEVERITY_WARNING 0x2
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#define RTAS_SEVERITY_EVENT 0x1
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#define RTAS_SEVERITY_NO_ERROR 0x0
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/* RTAS event disposition */
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#define RTAS_DISP_FULLY_RECOVERED 0x0
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#define RTAS_DISP_LIMITED_RECOVERY 0x1
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#define RTAS_DISP_NOT_RECOVERED 0x2
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/* RTAS event initiator */
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#define RTAS_INITIATOR_UNKNOWN 0x0
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#define RTAS_INITIATOR_CPU 0x1
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#define RTAS_INITIATOR_PCI 0x2
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#define RTAS_INITIATOR_ISA 0x3
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#define RTAS_INITIATOR_MEMORY 0x4
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#define RTAS_INITIATOR_POWERMGM 0x5
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/* RTAS event target */
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#define RTAS_TARGET_UNKNOWN 0x0
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#define RTAS_TARGET_CPU 0x1
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#define RTAS_TARGET_PCI 0x2
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#define RTAS_TARGET_ISA 0x3
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#define RTAS_TARGET_MEMORY 0x4
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#define RTAS_TARGET_POWERMGM 0x5
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/* RTAS event type */
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#define RTAS_TYPE_RETRY 0x01
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#define RTAS_TYPE_TCE_ERR 0x02
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#define RTAS_TYPE_INTERN_DEV_FAIL 0x03
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#define RTAS_TYPE_TIMEOUT 0x04
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#define RTAS_TYPE_DATA_PARITY 0x05
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#define RTAS_TYPE_ADDR_PARITY 0x06
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#define RTAS_TYPE_CACHE_PARITY 0x07
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#define RTAS_TYPE_ADDR_INVALID 0x08
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#define RTAS_TYPE_ECC_UNCORR 0x09
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#define RTAS_TYPE_ECC_CORR 0x0a
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#define RTAS_TYPE_EPOW 0x40
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#define RTAS_TYPE_PLATFORM 0xE0
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#define RTAS_TYPE_IO 0xE1
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#define RTAS_TYPE_INFO 0xE2
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#define RTAS_TYPE_DEALLOC 0xE3
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#define RTAS_TYPE_DUMP 0xE4
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/* I don't add PowerMGM events right now, this is a different topic */
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#define RTAS_TYPE_PMGM_POWER_SW_ON 0x60
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#define RTAS_TYPE_PMGM_POWER_SW_OFF 0x61
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#define RTAS_TYPE_PMGM_LID_OPEN 0x62
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#define RTAS_TYPE_PMGM_LID_CLOSE 0x63
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#define RTAS_TYPE_PMGM_SLEEP_BTN 0x64
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#define RTAS_TYPE_PMGM_WAKE_BTN 0x65
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#define RTAS_TYPE_PMGM_BATTERY_WARN 0x66
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#define RTAS_TYPE_PMGM_BATTERY_CRIT 0x67
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#define RTAS_TYPE_PMGM_SWITCH_TO_BAT 0x68
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#define RTAS_TYPE_PMGM_SWITCH_TO_AC 0x69
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#define RTAS_TYPE_PMGM_KBD_OR_MOUSE 0x6a
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#define RTAS_TYPE_PMGM_ENCLOS_OPEN 0x6b
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#define RTAS_TYPE_PMGM_ENCLOS_CLOSED 0x6c
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#define RTAS_TYPE_PMGM_RING_INDICATE 0x6d
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#define RTAS_TYPE_PMGM_LAN_ATTENTION 0x6e
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#define RTAS_TYPE_PMGM_TIME_ALARM 0x6f
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#define RTAS_TYPE_PMGM_CONFIG_CHANGE 0x70
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#define RTAS_TYPE_PMGM_SERVICE_PROC 0x71
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/* RTAS check-exception vector offset */
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#define RTAS_VECTOR_EXTERNAL_INTERRUPT 0x500
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struct rtas_error_log {
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unsigned long version:8; /* Architectural version */
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unsigned long severity:3; /* Severity level of error */
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unsigned long disposition:2; /* Degree of recovery */
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unsigned long extended:1; /* extended log present? */
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unsigned long /* reserved */ :2; /* Reserved for future use */
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unsigned long initiator:4; /* Initiator of event */
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unsigned long target:4; /* Target of failed operation */
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unsigned long type:8; /* General event or error*/
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unsigned long extended_log_length:32; /* length in bytes */
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unsigned char buffer[1]; /* Start of extended log */
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/* Variable length. */
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};
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#define RTAS_V6EXT_LOG_FORMAT_EVENT_LOG 14
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#define RTAS_V6EXT_COMPANY_ID_IBM (('I' << 24) | ('B' << 16) | ('M' << 8))
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/* RTAS general extended event log, Version 6. The extended log starts
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* from "buffer" field of struct rtas_error_log defined above.
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*/
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struct rtas_ext_event_log_v6 {
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/* Byte 0 */
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uint32_t log_valid:1; /* 1:Log valid */
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uint32_t unrecoverable_error:1; /* 1:Unrecoverable error */
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uint32_t recoverable_error:1; /* 1:recoverable (correctable */
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/* or successfully retried) */
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uint32_t degraded_operation:1; /* 1:Unrecoverable err, bypassed*/
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/* - degraded operation (e.g. */
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/* CPU or mem taken off-line) */
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uint32_t predictive_error:1;
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uint32_t new_log:1; /* 1:"New" log (Always 1 for */
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/* data returned from RTAS */
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uint32_t big_endian:1; /* 1: Big endian */
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uint32_t :1; /* reserved */
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/* Byte 1 */
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uint32_t :8; /* reserved */
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/* Byte 2 */
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uint32_t powerpc_format:1; /* Set to 1 (indicating log is */
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/* in PowerPC format */
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uint32_t :3; /* reserved */
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uint32_t log_format:4; /* Log format indicator. Define */
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/* format used for byte 12-2047 */
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/* Byte 3 */
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uint32_t :8; /* reserved */
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/* Byte 4-11 */
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uint8_t reserved[8]; /* reserved */
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/* Byte 12-15 */
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uint32_t company_id; /* Company ID of the company */
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/* that defines the format for */
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/* the vendor specific log type */
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/* Byte 16-end of log */
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uint8_t vendor_log[1]; /* Start of vendor specific log */
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/* Variable length. */
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};
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/*
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* This can be set by the rtas_flash module so that it can get called
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* as the absolutely last thing before the kernel terminates.
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*/
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extern void (*rtas_flash_term_hook)(int);
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extern struct rtas_t rtas;
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extern void enter_rtas(unsigned long);
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extern int rtas_token(const char *service);
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extern int rtas_service_present(const char *service);
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extern int rtas_call(int token, int, int, int *, ...);
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extern void rtas_restart(char *cmd);
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extern void rtas_power_off(void);
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extern void rtas_halt(void);
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extern void rtas_os_term(char *str);
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extern int rtas_get_sensor(int sensor, int index, int *state);
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extern int rtas_get_power_level(int powerdomain, int *level);
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extern int rtas_set_power_level(int powerdomain, int level, int *setlevel);
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extern bool rtas_indicator_present(int token, int *maxindex);
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extern int rtas_set_indicator(int indicator, int index, int new_value);
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extern int rtas_set_indicator_fast(int indicator, int index, int new_value);
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extern void rtas_progress(char *s, unsigned short hex);
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extern void rtas_initialize(void);
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extern int rtas_suspend_cpu(struct rtas_suspend_me_data *data);
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extern int rtas_suspend_last_cpu(struct rtas_suspend_me_data *data);
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extern int rtas_ibm_suspend_me(struct rtas_args *);
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struct rtc_time;
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extern unsigned long rtas_get_boot_time(void);
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extern void rtas_get_rtc_time(struct rtc_time *rtc_time);
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extern int rtas_set_rtc_time(struct rtc_time *rtc_time);
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extern unsigned int rtas_busy_delay_time(int status);
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extern unsigned int rtas_busy_delay(int status);
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extern int early_init_dt_scan_rtas(unsigned long node,
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const char *uname, int depth, void *data);
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extern void pSeries_log_error(char *buf, unsigned int err_type, int fatal);
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#ifdef CONFIG_PPC_RTAS_DAEMON
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extern void rtas_cancel_event_scan(void);
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#else
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static inline void rtas_cancel_event_scan(void) { }
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#endif
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/* Error types logged. */
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#define ERR_FLAG_ALREADY_LOGGED 0x0
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#define ERR_FLAG_BOOT 0x1 /* log was pulled from NVRAM on boot */
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#define ERR_TYPE_RTAS_LOG 0x2 /* from rtas event-scan */
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#define ERR_TYPE_KERNEL_PANIC 0x4 /* from die()/panic() */
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#define ERR_TYPE_KERNEL_PANIC_GZ 0x8 /* ditto, compressed */
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/* All the types and not flags */
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#define ERR_TYPE_MASK \
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(ERR_TYPE_RTAS_LOG | ERR_TYPE_KERNEL_PANIC | ERR_TYPE_KERNEL_PANIC_GZ)
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#define RTAS_DEBUG KERN_DEBUG "RTAS: "
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#define RTAS_ERROR_LOG_MAX 2048
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/*
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* Return the firmware-specified size of the error log buffer
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* for all rtas calls that require an error buffer argument.
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* This includes 'check-exception' and 'rtas-last-error'.
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*/
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extern int rtas_get_error_log_max(void);
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/* Event Scan Parameters */
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#define EVENT_SCAN_ALL_EVENTS 0xf0000000
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#define SURVEILLANCE_TOKEN 9000
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#define LOG_NUMBER 64 /* must be a power of two */
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#define LOG_NUMBER_MASK (LOG_NUMBER-1)
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/* Some RTAS ops require a data buffer and that buffer must be < 4G.
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* Rather than having a memory allocator, just use this buffer
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* (get the lock first), make the RTAS call. Copy the data instead
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* of holding the buffer for long.
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*/
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#define RTAS_DATA_BUF_SIZE 4096
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extern spinlock_t rtas_data_buf_lock;
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extern char rtas_data_buf[RTAS_DATA_BUF_SIZE];
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/* RMO buffer reserved for user-space RTAS use */
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extern unsigned long rtas_rmo_buf;
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#define GLOBAL_INTERRUPT_QUEUE 9005
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/**
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* rtas_config_addr - Format a busno, devfn and reg for RTAS.
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* @busno: The bus number.
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* @devfn: The device and function number as encoded by PCI_DEVFN().
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* @reg: The register number.
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*
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* This function encodes the given busno, devfn and register number as
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* required for RTAS calls that take a "config_addr" parameter.
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* See PAPR requirement 7.3.4-1 for more info.
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*/
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static inline u32 rtas_config_addr(int busno, int devfn, int reg)
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{
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return ((reg & 0xf00) << 20) | ((busno & 0xff) << 16) |
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(devfn << 8) | (reg & 0xff);
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}
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extern void __cpuinit rtas_give_timebase(void);
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extern void __cpuinit rtas_take_timebase(void);
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#ifdef CONFIG_PPC_RTAS
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static inline int page_is_rtas_user_buf(unsigned long pfn)
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{
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unsigned long paddr = (pfn << PAGE_SHIFT);
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if (paddr >= rtas_rmo_buf && paddr < (rtas_rmo_buf + RTAS_RMOBUF_MAX))
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return 1;
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return 0;
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}
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#else
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static inline int page_is_rtas_user_buf(unsigned long pfn) { return 0;}
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#endif
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#endif /* __KERNEL__ */
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#endif /* _POWERPC_RTAS_H */
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