256 lines
7.6 KiB
C
256 lines
7.6 KiB
C
/*-
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* ----------------------------------------------------------------------------
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* "THE BEER-WARE LICENSE" (Revision 42):
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* <phk@FreeBSD.org> wrote this file. As long as you retain this notice you
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* can do whatever you want with this stuff. If we meet some day, and you think
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* this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp
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* ----------------------------------------------------------------------------
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*
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* $FreeBSD$
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*/
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#ifndef _SYS_SMP_H_
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#define _SYS_SMP_H_
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#ifdef _KERNEL
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#ifndef LOCORE
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#include <sys/cpuset.h>
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#include <sys/queue.h>
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/*
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* Types of nodes in the topological tree.
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*/
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typedef enum {
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/* No node has this type; can be used in topo API calls. */
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TOPO_TYPE_DUMMY,
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/* Processing unit aka computing unit aka logical CPU. */
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TOPO_TYPE_PU,
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/* Physical subdivision of a package. */
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TOPO_TYPE_CORE,
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/* CPU L1/L2/L3 cache. */
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TOPO_TYPE_CACHE,
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/* Package aka chip, equivalent to socket. */
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TOPO_TYPE_PKG,
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/* NUMA node. */
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TOPO_TYPE_NODE,
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/* Other logical or physical grouping of PUs. */
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/* E.g. PUs on the same dye, or PUs sharing an FPU. */
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TOPO_TYPE_GROUP,
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/* The whole system. */
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TOPO_TYPE_SYSTEM
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} topo_node_type;
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/* Hardware indenitifier of a topology component. */
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typedef unsigned int hwid_t;
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/* Logical CPU idenitifier. */
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typedef int cpuid_t;
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/* A node in the topology. */
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struct topo_node {
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struct topo_node *parent;
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TAILQ_HEAD(topo_children, topo_node) children;
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TAILQ_ENTRY(topo_node) siblings;
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cpuset_t cpuset;
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topo_node_type type;
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uintptr_t subtype;
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hwid_t hwid;
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cpuid_t id;
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int nchildren;
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int cpu_count;
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};
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/*
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* Scheduling topology of a NUMA or SMP system.
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*
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* The top level topology is an array of pointers to groups. Each group
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* contains a bitmask of cpus in its group or subgroups. It may also
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* contain a pointer to an array of child groups.
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*
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* The bitmasks at non leaf groups may be used by consumers who support
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* a smaller depth than the hardware provides.
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*
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* The topology may be omitted by systems where all CPUs are equal.
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*/
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struct cpu_group {
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struct cpu_group *cg_parent; /* Our parent group. */
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struct cpu_group *cg_child; /* Optional children groups. */
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cpuset_t cg_mask; /* Mask of cpus in this group. */
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int32_t cg_count; /* Count of cpus in this group. */
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int16_t cg_children; /* Number of children groups. */
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int8_t cg_level; /* Shared cache level. */
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int8_t cg_flags; /* Traversal modifiers. */
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};
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typedef struct cpu_group *cpu_group_t;
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/*
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* Defines common resources for CPUs in the group. The highest level
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* resource should be used when multiple are shared.
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*/
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#define CG_SHARE_NONE 0
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#define CG_SHARE_L1 1
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#define CG_SHARE_L2 2
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#define CG_SHARE_L3 3
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#define MAX_CACHE_LEVELS CG_SHARE_L3
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/*
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* Behavior modifiers for load balancing and affinity.
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*/
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#define CG_FLAG_HTT 0x01 /* Schedule the alternate core last. */
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#define CG_FLAG_SMT 0x02 /* New age htt, less crippled. */
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#define CG_FLAG_THREAD (CG_FLAG_HTT | CG_FLAG_SMT) /* Any threading. */
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/*
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* Convenience routines for building and traversing topologies.
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*/
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#ifdef SMP
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void topo_init_node(struct topo_node *node);
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void topo_init_root(struct topo_node *root);
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struct topo_node * topo_add_node_by_hwid(struct topo_node *parent, int hwid,
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topo_node_type type, uintptr_t subtype);
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struct topo_node * topo_find_node_by_hwid(struct topo_node *parent, int hwid,
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topo_node_type type, uintptr_t subtype);
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void topo_promote_child(struct topo_node *child);
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struct topo_node * topo_next_node(struct topo_node *top,
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struct topo_node *node);
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struct topo_node * topo_next_nonchild_node(struct topo_node *top,
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struct topo_node *node);
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void topo_set_pu_id(struct topo_node *node, cpuid_t id);
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int topo_analyze(struct topo_node *topo_root, int all, int *pkg_count,
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int *cores_per_pkg, int *thrs_per_core);
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#define TOPO_FOREACH(i, root) \
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for (i = root; i != NULL; i = topo_next_node(root, i))
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struct cpu_group *smp_topo(void);
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struct cpu_group *smp_topo_alloc(u_int count);
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struct cpu_group *smp_topo_none(void);
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struct cpu_group *smp_topo_1level(int l1share, int l1count, int l1flags);
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struct cpu_group *smp_topo_2level(int l2share, int l2count, int l1share,
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int l1count, int l1flags);
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struct cpu_group *smp_topo_find(struct cpu_group *top, int cpu);
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extern void (*cpustop_restartfunc)(void);
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extern int smp_cpus;
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extern volatile cpuset_t started_cpus;
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extern volatile cpuset_t stopped_cpus;
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extern volatile cpuset_t suspended_cpus;
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extern cpuset_t hlt_cpus_mask;
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extern cpuset_t logical_cpus_mask;
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#endif /* SMP */
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extern u_int mp_maxid;
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extern int mp_maxcpus;
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extern int mp_ncpus;
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extern volatile int smp_started;
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extern cpuset_t all_cpus;
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extern cpuset_t cpuset_domain[MAXMEMDOM]; /* CPUs in each NUMA domain. */
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/*
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* Macro allowing us to determine whether a CPU is absent at any given
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* time, thus permitting us to configure sparse maps of cpuid-dependent
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* (per-CPU) structures.
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*/
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#define CPU_ABSENT(x_cpu) (!CPU_ISSET(x_cpu, &all_cpus))
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/*
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* Macros to iterate over non-absent CPUs. CPU_FOREACH() takes an
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* integer iterator and iterates over the available set of CPUs.
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* CPU_FIRST() returns the id of the first non-absent CPU. CPU_NEXT()
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* returns the id of the next non-absent CPU. It will wrap back to
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* CPU_FIRST() once the end of the list is reached. The iterators are
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* currently implemented via inline functions.
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*/
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#define CPU_FOREACH(i) \
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for ((i) = 0; (i) <= mp_maxid; (i)++) \
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if (!CPU_ABSENT((i)))
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static __inline int
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cpu_first(void)
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{
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int i;
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for (i = 0;; i++)
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if (!CPU_ABSENT(i))
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return (i);
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}
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static __inline int
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cpu_next(int i)
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{
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for (;;) {
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i++;
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if (i > mp_maxid)
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i = 0;
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if (!CPU_ABSENT(i))
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return (i);
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}
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}
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#define CPU_FIRST() cpu_first()
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#define CPU_NEXT(i) cpu_next((i))
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#ifdef SMP
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/*
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* Machine dependent functions used to initialize MP support.
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*
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* The cpu_mp_probe() should check to see if MP support is present and return
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* zero if it is not or non-zero if it is. If MP support is present, then
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* cpu_mp_start() will be called so that MP can be enabled. This function
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* should do things such as startup secondary processors. It should also
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* setup mp_ncpus, all_cpus, and smp_cpus. It should also ensure that
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* smp_started is initialized at the appropriate time.
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* Once cpu_mp_start() returns, machine independent MP startup code will be
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* executed and a simple message will be output to the console. Finally,
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* cpu_mp_announce() will be called so that machine dependent messages about
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* the MP support may be output to the console if desired.
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*
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* The cpu_setmaxid() function is called very early during the boot process
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* so that the MD code may set mp_maxid to provide an upper bound on CPU IDs
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* that other subsystems may use. If a platform is not able to determine
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* the exact maximum ID that early, then it may set mp_maxid to MAXCPU - 1.
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*/
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struct thread;
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struct cpu_group *cpu_topo(void);
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void cpu_mp_announce(void);
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int cpu_mp_probe(void);
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void cpu_mp_setmaxid(void);
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void cpu_mp_start(void);
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void forward_signal(struct thread *);
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int restart_cpus(cpuset_t);
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int stop_cpus(cpuset_t);
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int stop_cpus_hard(cpuset_t);
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#if defined(__amd64__) || defined(__i386__)
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int suspend_cpus(cpuset_t);
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int resume_cpus(cpuset_t);
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#endif
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void smp_rendezvous_action(void);
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extern struct mtx smp_ipi_mtx;
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#endif /* SMP */
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int quiesce_all_cpus(const char *, int);
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int quiesce_cpus(cpuset_t, const char *, int);
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void smp_no_rendevous_barrier(void *);
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void smp_rendezvous(void (*)(void *),
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void (*)(void *),
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void (*)(void *),
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void *arg);
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void smp_rendezvous_cpus(cpuset_t,
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void (*)(void *),
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void (*)(void *),
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void (*)(void *),
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void *arg);
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#endif /* !LOCORE */
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#endif /* _KERNEL */
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#endif /* _SYS_SMP_H_ */
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