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android_kernel_xiaomi_sm8350/arch/powerpc/include/asm/rtas.h
Nathan Lynch 7beea356fa powerpc/rtas: don't online CPUs for partition suspend 
[ Upstream commit ec2fc2a9e9bbad9023aab65bc472ce7a3ca8608f ]

Partition suspension, used for hibernation and migration, requires
that the OS place all but one of the LPAR's processor threads into one
of two states prior to calling the ibm,suspend-me RTAS function:

  * the architected offline state (via RTAS stop-self); or
  * the H_JOIN hcall, which does not return until the partition
    resumes execution

Using H_CEDE as the offline mode, introduced by
commit 3aa565f53c ("powerpc/pseries: Add hooks to put the CPU into
an appropriate offline state"), means that any threads which are
offline from Linux's point of view must be moved to one of those two
states before a partition suspension can proceed.

This was eventually addressed in commit 120496ac2d ("powerpc: Bring
all threads online prior to migration/hibernation"), which added code
to temporarily bring up any offline processor threads so they can call
H_JOIN. Conceptually this is fine, but the implementation has had
multiple races with cpu hotplug operations initiated from user
space[1][2][3], the error handling is fragile, and it generates
user-visible cpu hotplug events which is a lot of noise for a platform
feature that's supposed to minimize disruption to workloads.

With commit 3aa565f53c ("powerpc/pseries: Add hooks to put the CPU
into an appropriate offline state") reverted, this code becomes
unnecessary, so remove it. Since any offline CPUs now are truly
offline from the platform's point of view, it is no longer necessary
to bring up CPUs only to have them call H_JOIN and then go offline
again upon resuming. Only active threads are required to call H_JOIN;
stopped threads can be left alone.

[1] commit a6717c01dd ("powerpc/rtas: use device model APIs and
    serialization during LPM")
[2] commit 9fb603050f ("powerpc/rtas: retry when cpu offline races
    with suspend/migration")
[3] commit dfd718a2ed ("powerpc/rtas: Fix a potential race between
    CPU-Offline & Migration")

Fixes: 120496ac2d ("powerpc: Bring all threads online prior to migration/hibernation")
Signed-off-by: Nathan Lynch <nathanl@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200612051238.1007764-3-nathanl@linux.ibm.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
2020-08-19 08:16:12 +02:00

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/* 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_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 */
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