Merge remote-tracking branch 'origin/master'

[unleashed/lotheac.git] / usr / src / uts / common / conf / param.c

/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */

/*
 * Copyright 2014 Nexenta Systems, Inc.  All rights reserved.
 * Copyright (c) 1983, 2010, Oracle and/or its affiliates. All rights reserved.
 * Copyright 2012 Milan Jurik. All rights reserved.
 */

#include <sys/cfgparam.h>
#include <sys/types.h>
#include <sys/time.h>
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/signal.h>
#include <sys/sysmacros.h>
#include <sys/cmn_err.h>
#include <sys/user.h>
#include <sys/proc.h>
#include <sys/task.h>
#include <sys/project.h>
#include <sys/klwp.h>
#include <sys/vnode.h>
#include <sys/file.h>
#include <sys/fcntl.h>
#include <sys/flock.h>
#include <sys/var.h>
#include <sys/stream.h>
#include <sys/strsubr.h>
#include <sys/conf.h>
#include <sys/class.h>
#include <sys/ts.h>
#include <sys/rt.h>
#include <sys/exec.h>
#include <sys/exechdr.h>
#include <sys/buf.h>
#include <sys/resource.h>
#include <vm/seg.h>
#include <vm/pvn.h>
#include <vm/seg_kmem.h>
#include <sys/vmparam.h>
#include <sys/machparam.h>
#include <sys/utsname.h>
#include <sys/kmem.h>
#include <sys/stack.h>
#include <sys/modctl.h>
#include <sys/fdbuffer.h>
#include <sys/cyclic_impl.h>
#include <sys/disp.h>
#include <sys/tuneable.h>
#include <sys/systeminfo.h>

#include <sys/vmem.h>
#include <sys/clock.h>
#include <sys/clock_impl.h>
#include <sys/serializer.h>

/*
 * The following few lines describe generic things that must be compiled
 * into the booted executable (unix) rather than genunix or any other
 * module because they're required by crash dump readers, etc.
 */
struct modctl modules;          /* head of linked list of modules */
char *default_path;             /* default module loading path */
struct swapinfo *swapinfo;      /* protected by the swapinfo_lock */
proc_t *practive;               /* active process list */
uint_t nproc;                   /* current number of processes */
proc_t p0;                      /* process 0 */
struct plock p0lock;            /* p0's p_lock */
klwp_t lwp0;                    /* t0's lwp */
task_t *task0p;                 /* task 0 */
kproject_t *proj0p;             /* location of project 0 */

/*
 * The following are "implementation architecture" dependent constants made
 * available here in the form of initialized data for use by "implementation
 * architecture" independent modules. See machparam.h.
 */
const unsigned long     _pagesize       = (unsigned long)PAGESIZE;
const unsigned int      _pageshift      = (unsigned int)PAGESHIFT;
const unsigned long     _pageoffset     = (unsigned long)PAGEOFFSET;
/*
 * XXX - This value pagemask has to be a 64bit size because
 * large file support uses this mask on offsets which are 64 bit size.
 * using unsigned leaves the higher 32 bits value as zero thus
 * corrupting offset calculations in the file system and VM.
 */
const u_longlong_t      _pagemask       = (u_longlong_t)PAGEMASK;
const unsigned long     _mmu_pagesize   = (unsigned long)MMU_PAGESIZE;
const unsigned int      _mmu_pageshift  = (unsigned int)MMU_PAGESHIFT;
const unsigned long     _mmu_pageoffset = (unsigned long)MMU_PAGEOFFSET;
const unsigned long     _mmu_pagemask   = (unsigned long)MMU_PAGEMASK;
uintptr_t               _kernelbase     = (uintptr_t)KERNELBASE;
uintptr_t               _userlimit      = (uintptr_t)USERLIMIT;
uintptr_t               _userlimit32    = (uintptr_t)USERLIMIT32;
const uintptr_t         _argsbase       = (uintptr_t)ARGSBASE;
const unsigned int      _diskrpm        = (unsigned int)DISKRPM;
const unsigned long     _pgthresh       = (unsigned long)PGTHRESH;
const unsigned int      _maxslp         = (unsigned int)MAXSLP;
const unsigned long     _maxhandspreadpages = (unsigned long)MAXHANDSPREADPAGES;
const int               _ncpu           = (int)NCPU;
const int               _ncpu_log2      = (int)NCPU_LOG2;
const int               _ncpu_p2        = (int)NCPU_P2;
const unsigned long     _defaultstksz   = (unsigned long)DEFAULTSTKSZ;
const unsigned int      _nbpg           = (unsigned int)MMU_PAGESIZE;

/*
 * System parameter formulae.
 *
 * This file is copied into each directory where we compile
 * the kernel; it should be modified there to suit local taste
 * if necessary.
 */

/*
 * Default hz is 100, but if we set hires_tick we get higher resolution
 * clock behavior (currently defined to be 1000 hz).  Higher values seem
 * to work, but are not supported.
 *
 * If we do decide to play with higher values, remember that hz should
 * satisfy the following constraints to avoid integer round-off problems:
 *
 * (1) hz should be in the range 100 <= hz <= MICROSEC.  If hz exceeds
 *     MICROSEC, usec_per_tick will be zero and lots of stuff will break.
 *     Similarly, if hz < 100 then hz / 100 == 0 and stuff will break.
 *
 * (2) If hz <= 1000, it should be both a multiple of 100 and a
 *      divisor of 1000.
 *
 * (3) If hz > 1000, it should be both a multiple of 1000 and a
 *      divisor of MICROSEC.
 *
 * Thus the only reasonable values of hz (i.e. the values that won't
 * cause roundoff error) are: 100, 200, 500, 1000, 2000, 4000, 5000,
 * 8000, 10000, 20000, 25000, 40000, 50000, 100000, 125000, 200000,
 * 250000, 500000, 1000000.  As of this writing (1996) a clock rate
 * of more than about 10 kHz seems utterly ridiculous, although
 * this observation will no doubt seem quaintly amusing one day.
 */
#define HIRES_HZ_DEFAULT        1000

int hz = HZ_DEFAULT;
int hires_hz = HIRES_HZ_DEFAULT;

int hires_tick = 0;
int cpu_decay_factor = 10;      /* this is no longer tied to clock */
int max_hres_adj;       /* maximum adjustment of hrtime per tick */
int tick_per_msec;      /* clock ticks per millisecond (zero if hz < 1000) */

/*
 * Milliseconds, Microseconds, and Nanoseconds per clock tick
 *
 * Note:
 *  msec_per_tick is zero if hz > 1000
 */
int msec_per_tick;
int usec_per_tick;
int nsec_per_tick;

/*
 * Time Resolution values. These are defined in condvar.h and initialized in
 * param_init(). Consumers of cv_reltimedwait() and cv_reltimedwait_sig()
 * need to specify how accurate the timeout argument should be through
 * one of these values. The intention is to allow the underlying implementation
 * to anticipate or defer the expiration of timeouts, preventing unnecessary
 * wakeups by batch processing similarly expiring events.
 */
time_res_t time_res[TR_COUNT];

/*
 * Setting "snooping" to a non-zero value will cause a deadman panic if
 * snoop_interval microseconds elapse without lbolt increasing.  The default
 * snoop_interval is 50 seconds.
 */
#define SNOOP_INTERVAL_MIN      (MICROSEC)
#define SNOOP_INTERVAL_DEFAULT  (50 * MICROSEC)

int snooping = 0;
uint_t snoop_interval = SNOOP_INTERVAL_DEFAULT;

/*
 * Tables of initialization functions, called from main().
 */

extern void system_taskq_init(void);
extern void binit(void);
extern void space_init(void);
extern void dnlc_init(void);
extern void vfsinit(void);
extern void finit(void);
extern void strinit(void);
extern void flk_init(void);
extern void ftrace_init(void);
extern void softcall_init(void);
extern void ttyinit(void);
extern void schedctl_init(void);
extern void deadman_init(void);
extern void clock_timer_init(void);
extern void clock_realtime_init(void);
extern void clock_highres_init(void);
extern void clock_tick_mp_init(void);
extern void cu_init(void);
extern void callout_mp_init(void);
extern void cpu_seq_tbl_init(void);

void    (*init_tbl[])(void) = {
        system_taskq_init,
        binit,
        space_init,
        dnlc_init,
        vfsinit,
        finit,
        strinit,
        serializer_init,
        softcall_init,
        ttyinit,
        as_init,
        pvn_init,
        anon_init,
        segvn_init,
        flk_init,
        cpu_seq_tbl_init,
        schedctl_init,
        fdb_init,
        deadman_init,
        clock_timer_init,
        clock_realtime_init,
        clock_highres_init,
        0
};



/*
 * Any per cpu resources should be initialized via
 * an entry in mp_init_tbl().
 */
void    (*mp_init_tbl[])(void) = {
        ftrace_init,
        cyclic_mp_init,
        clock_tick_mp_init,
        cu_init,
        callout_mp_init,
        0
};

int maxusers;           /* kitchen-sink knob for dynamic configuration */

/*
 * pidmax -- highest pid value assigned by the system
 * Settable in /etc/system
 */
int pidmax = DEFAULT_MAXPID;

/*
 * jump_pid - if set, this value is where pid numbers should start
 * after the first few system pids (0-3) are used.  If 0, pids are
 * chosen in the usual way. This variable can be used to quickly
 * create large pids (by setting it to 100000, for example). pids
 * less than this value will never be chosen.
 */
pid_t jump_pid = DEFAULT_JUMPPID;

/*
 * autoup -- used in struct var for dynamic config of the age a delayed-write
 * buffer must be in seconds before bdflush will write it out.
 */
#define DEFAULT_AUTOUP  30
int autoup = DEFAULT_AUTOUP;

/*
 * bufhwm -- tuneable variable for struct var for v_bufhwm.
 * high water mark for buffer cache mem usage in units of K bytes.
 *
 * bufhwm_pct -- ditto, but given in % of physmem.
 */
int bufhwm = 0;
int bufhwm_pct = 0;

/*
 * Process table.
 */
int maxpid;
int max_nprocs;         /* set in param_init() */
int maxuprc;            /* set in param_init() */
int reserved_procs;
int nthread = 1;

/*
 * UFS tunables
 */
int ufs_ninode;         /* declared here due to backwards compatibility */
int ndquot;             /* declared here due to backwards compatibility */

/*
 * Exec switch table. This is used by the generic exec module
 * to switch out to the desired executable type, based on the
 * magic number. The currently supported types are ELF, a.out
 * (both NMAGIC and ZMAGIC), interpreter (#!) files,
 * and Java executables.
 */
/*
 * Magic numbers
 */
short elfmagic = 0x7f45;
short intpmagic = 0x2321;
short jmagic = 0x504b;

short nomagic = 0;

/*
 * Magic strings
 */
#define ELF32MAGIC_STRING       "\x7f""ELF\x1"
#define ELF64MAGIC_STRING       "\x7f""ELF\x2"
#define INTPMAGIC_STRING        "#!"
#define JAVAMAGIC_STRING        "PK\003\004"
#define AOUT_OMAGIC_STRING      "\x1""\x07"     /* 0407 */
#define AOUT_NMAGIC_STRING      "\x1""\x08"     /* 0410 */
#define AOUT_ZMAGIC_STRING      "\x1""\x0b"     /* 0413 */
#define NOMAGIC_STRING          ""

char elf32magicstr[] = ELF32MAGIC_STRING;
char elf64magicstr[] = ELF64MAGIC_STRING;
char intpmagicstr[] = INTPMAGIC_STRING;
char javamagicstr[] = JAVAMAGIC_STRING;
char nomagicstr[] = NOMAGIC_STRING;

char *execswnames[] = {
        "elfexec",      /* Elf32 */
#ifdef _LP64
        "elfexec",      /* Elf64 */
#endif
        "intpexec",
        "javaexec",
        NULL,
        NULL,
        NULL
};

struct execsw execsw[] = {
        { elf32magicstr, 0, 5, NULL, NULL, NULL },
#ifdef _LP64
        { elf64magicstr, 0, 5, NULL, NULL, NULL },
#endif
        { intpmagicstr, 0, 2, NULL, NULL, NULL },
        { javamagicstr, 0, 4, NULL, NULL, NULL },
        { nomagicstr, 0, 0, NULL, NULL, NULL },
        { nomagicstr, 0, 0, NULL, NULL, NULL },
        { nomagicstr, 0, 0, NULL, NULL, NULL },
        { nomagicstr, 0, 0, NULL, NULL, NULL }
};
int nexectype = sizeof (execsw) / sizeof (execsw[0]);   /* # of exec types */
kmutex_t execsw_lock;   /* Used for allocation of execsw entries */

/*
 * symbols added to make changing proc.max-file-descriptor
 * simple via /etc/system
 */
#define RLIM_FD_CUR 0x10000
#define RLIM_FD_MAX 0x10000

uint_t rlim_fd_cur = RLIM_FD_CUR;
uint_t rlim_fd_max = RLIM_FD_MAX;

/*
 * (Default resource limits were formerly declared here, but are now provided by
 * the more general resource controls framework.)
 */

/*
 * STREAMS tunables
 */
int     nstrpush = 9;           /* maximum # of modules/drivers on a stream */
ssize_t strctlsz = 1024;        /* maximum size of user-generated M_PROTO */
ssize_t strmsgsz = 0x10000;     /* maximum size of user-generated M_DATA */
                                /* for `strmsgsz', zero means unlimited */
/*
 * Filesystem tunables
 */
int     rstchown = 1;           /* POSIX_CHOWN_RESTRICTED is enabled */
int     ngroups_max = NGROUPS_MAX_DEFAULT;

/*
 * generic scheduling stuff
 *
 * Configurable parameters for RT and TS are in the respective
 * scheduling class modules.
 */

pri_t maxclsyspri = MAXCLSYSPRI;
pri_t minclsyspri = MINCLSYSPRI;
char sys_name[] = "SYS";

extern pri_t sys_init(id_t, int, classfuncs_t **);
extern classfuncs_t sys_classfuncs;

sclass_t sclass[] = {
        { "SYS",        sys_init,       &sys_classfuncs, STATIC_SCHED, 0 },
        { "",   NULL,   NULL,   NULL, 0 },
        { "",   NULL,   NULL,   NULL, 0 },
        { "",   NULL,   NULL,   NULL, 0 },
        { "",   NULL,   NULL,   NULL, 0 },
        { "",   NULL,   NULL,   NULL, 0 },
        { "",   NULL,   NULL,   NULL, 0 },
        { "",   NULL,   NULL,   NULL, 0 },
        { "",   NULL,   NULL,   NULL, 0 },
        { "",   NULL,   NULL,   NULL, 0 }
};

int loaded_classes = 1;         /* for loaded classes */
kmutex_t class_lock;            /* lock for class[] */

int nclass = sizeof (sclass) / sizeof (sclass_t);
char initcls[] = "TS";
char *defaultclass = initcls;

/*
 * Tunable system parameters.
 */

/*
 * The integers tune_* are done this way so that the tune
 * data structure may be "tuned" if necessary from the /etc/system
 * file. The tune data structure is initialized in param_init();
 */

tune_t tune;

/*
 * If freemem < t_getpgslow, then start to steal pages from processes.
 */
int tune_t_gpgslo = 25;

/*
 * Rate at which fsflush is run, in seconds.
 */
#define DEFAULT_TUNE_T_FSFLUSHR 1
int tune_t_fsflushr = DEFAULT_TUNE_T_FSFLUSHR;

/*
 * The minimum available resident (not swappable) memory to maintain
 * in order to avoid deadlock.  In pages.
 */
int tune_t_minarmem = 25;

/*
 * The minimum available swappable memory to maintain in order to avoid
 * deadlock.  In pages.
 */
int tune_t_minasmem = 25;

int tune_t_flckrec = 512;       /* max # of active frlocks */

/*
 * Number of currently available pages that cannot be 'locked'
 * This is set in init_pages_pp_maximum, and must be initialized
 * to zero here to detect an override in /etc/system
 */
pgcnt_t pages_pp_maximum = 0;

int boothowto;                  /* boot flags passed to kernel */
struct var v;                   /* System Configuration Information */

/*
 * System Configuration Information
 */

/*
 * The physical system's host identifier, expressed as a decimal string.
 * Code should only directly access this value when writing to it (setting the
 * physical system's host identifier).  Code that reads the physical system's
 * host identifier should use zone_get_hostid(NULL) instead.
 */
char hw_serial[HW_HOSTID_LEN] = "0";

#if defined(__sparc) || defined(__amd64)

char architecture[] = CONFIG_MACH64_STR;
char architecture_32[] = CONFIG_MACH_STR;

#elif defined(__i386)

char architecture[] = CONFIG_MACH_STR;
char architecture_32[] = CONFIG_MACH_STR;

#else
#error "unknown processor architecture"
#endif

char hw_provider[SYS_NMLN] = "";
char srpc_domain[SYS_NMLN] = "";
char platform[SYS_NMLN] = "";   /* read from the devinfo root node */

/* Initialize isa_list */
char *isa_list = architecture;

static pgcnt_t original_physmem = 0;

#define MIN_DEFAULT_MAXUSERS    8u
#define MAX_DEFAULT_MAXUSERS    2048u
#define MAX_MAXUSERS            4096u

void
param_preset(void)
{
        original_physmem = physmem;
}

void
param_calc(int platform_max_nprocs)
{
        /*
         * Default to about one "user" per megabyte, taking into
         * account both physical and virtual constraints.
         * Note: 2^20 is a meg; shifting right by (20 - PAGESHIFT)
         * converts pages to megs without integer overflow.
         */
        if (maxusers == 0) {
                pgcnt_t physmegs = physmem >> (20 - PAGESHIFT);
                pgcnt_t virtmegs = vmem_size(heap_arena, VMEM_FREE) >> 20;
                maxusers = MIN(MAX(MIN(physmegs, virtmegs),
                    MIN_DEFAULT_MAXUSERS), MAX_DEFAULT_MAXUSERS);
        }
        if (maxusers > MAX_MAXUSERS) {
                maxusers = MAX_MAXUSERS;
                cmn_err(CE_NOTE, "maxusers limited to %d", MAX_MAXUSERS);
        }

#ifdef DEBUG
        /*
         * The purpose of maxusers is to prevent memory overcommit.
         * DEBUG kernels take more space, so reduce maxusers a bit.
         */
        maxusers = (3 * maxusers) / 4;
#endif

        /*
         * We need to dynamically change any variables now so that
         * the setting of maxusers and pidmax propagate to the other
         * variables that are dependent on them.
         */
        if (reserved_procs == 0)
                reserved_procs = 5;
        if (pidmax < reserved_procs || pidmax > MAX_MAXPID)
                maxpid = MAX_MAXPID;
        else
                maxpid = pidmax;

        /*
         * This allows platform-dependent code to constrain the maximum
         * number of processes allowed in case there are e.g. VM limitations
         * with how many contexts are available.
         */
        if (max_nprocs == 0)
                max_nprocs = (10 + 16 * maxusers);
        if (platform_max_nprocs > 0 && max_nprocs > platform_max_nprocs)
                max_nprocs = platform_max_nprocs;
        if (max_nprocs > maxpid)
                max_nprocs = maxpid;

        if (maxuprc == 0)
                maxuprc = (max_nprocs - reserved_procs);
}

void
param_init(void)
{
        /*
         * Set each individual element of struct var v to be the
         * default value. This is done this way
         * so that a user can set the assigned integer value in the
         * /etc/system file *IF* tuning is needed.
         */
        v.v_proc = max_nprocs;  /* v_proc - max # of processes system wide */
        v.v_maxupttl = max_nprocs - reserved_procs;
        v.v_maxsyspri = (int)maxclsyspri;  /* max global pri for sysclass */
        v.v_maxup = MIN(maxuprc, v.v_maxupttl); /* max procs per user */
        v.v_autoup = autoup;    /* v_autoup - delay for delayed writes */

        /*
         * Set each individual element of struct tune to be the
         * default value. Each struct element This is done this way
         *  so that a user can set the assigned integer value in the
         * /etc/system file *IF* tuning is needed.
         */
        tune.t_gpgslo = tune_t_gpgslo;
        tune.t_fsflushr = tune_t_fsflushr;
        tune.t_minarmem = tune_t_minarmem;
        tune.t_minasmem = tune_t_minasmem;
        tune.t_flckrec = tune_t_flckrec;

        /*
         * Initialization for file descriptors to correct mistaken settings in
         * /etc/system.  Initialization of limits performed by resource control
         * system.
         */
        if (rlim_fd_cur > rlim_fd_max)
                rlim_fd_cur = rlim_fd_max;

        /*
         * calculations needed if hz was set in /etc/system
         */
        if (hires_tick)
                hz = hires_hz;

        tick_per_msec = hz / MILLISEC;
        msec_per_tick = MILLISEC / hz;
        usec_per_tick = MICROSEC / hz;
        nsec_per_tick = NANOSEC / hz;
        max_hres_adj = nsec_per_tick >> ADJ_SHIFT;

        /*
         * Consumers of relative timedwait functions must specify how accurately
         * the given timeout must expire. This is currently TR_CLOCK_TICK for
         * the vast majority of consumers, but nsec_per_tick becomes an
         * artificial value in a tickless world. Each caller of such routines
         * should re-evaluate their usage and specify the appropriate
         * resolution.
         */
        time_res[TR_NANOSEC] = NANOSEC / NANOSEC;
        time_res[TR_MICROSEC] = NANOSEC / MICROSEC;
        time_res[TR_MILLISEC] = NANOSEC / MILLISEC;
        time_res[TR_SEC] = NANOSEC / SEC;
        time_res[TR_CLOCK_TICK] = nsec_per_tick;
}

/*
 * Validate tuneable parameters following /etc/system processing,
 * but prior to param_init().
 */
void
param_check(void)
{
#if defined(__x86)
        if (physmem != original_physmem) {
                cmn_err(CE_NOTE, "physmem cannot be modified to 0x%lx"
                    " via /etc/system. Please use eeprom(8) instead.",
                    physmem);
                physmem = original_physmem;
        }
#endif
        if (ngroups_max < NGROUPS_UMIN)
                ngroups_max = NGROUPS_UMIN;
        if (ngroups_max > NGROUPS_UMAX)
                ngroups_max = NGROUPS_UMAX;

        /* If we have many groups then the ucred proto message also grows. */
        if (ngroups_max > NGROUPS_OLDMAX &&
            strctlsz < (ngroups_max - NGROUPS_OLDMAX) * sizeof (gid_t) + 1024) {
                strctlsz = (ngroups_max - NGROUPS_OLDMAX) * sizeof (gid_t) +
                    1024;
        }

        if (autoup <= 0) {
                autoup = DEFAULT_AUTOUP;
                cmn_err(CE_WARN, "autoup <= 0; defaulting to %d", autoup);
        }

        if (tune_t_fsflushr <= 0) {
                tune_t_fsflushr = DEFAULT_TUNE_T_FSFLUSHR;
                cmn_err(CE_WARN, "tune_t_fsflushr <= 0; defaulting to %d",
                    tune_t_fsflushr);
        }

        if (jump_pid < 0 || jump_pid >= pidmax) {
                jump_pid = 0;
                cmn_err(CE_WARN, "jump_pid < 0 or >= pidmax; ignored");
        }

        if (snoop_interval < SNOOP_INTERVAL_MIN) {
                snoop_interval = SNOOP_INTERVAL_DEFAULT;
                cmn_err(CE_WARN, "snoop_interval < minimum (%d); defaulting"
                    " to %d", SNOOP_INTERVAL_MIN, SNOOP_INTERVAL_DEFAULT);
        }
}