perf: Clean up perf_{session,alloc} management
[akaros.git] / kern / include / ros / procinfo.h
1 /* See COPYRIGHT for copyright information. */
2
3 #pragma once
4
5 #include <ros/memlayout.h>
6 #include <ros/common.h>
7 #include <ros/resource.h>
8 #include <ros/atomic.h>
9 #include <ros/arch/arch.h>
10 #include <ros/cpu_feat.h>
11 #include <string.h>
12
13 /* Process creation flags */
14 #define PROC_DUP_FGRP                   1
15
16 #define PROCINFO_MAX_ARGP 32
17 #define PROCINFO_ARGBUF_SIZE 3072
18
19 #ifdef ROS_KERNEL
20 #include <sys/queue.h>
21 #endif /* ROS_KERNEL */
22
23 /* Not necessary to expose all of this, but it doesn't hurt, and is convenient
24  * for the kernel.  Need to do some acrobatics for the TAILQ_ENTRY. */
25 struct vcore;
26 struct vcore {
27 #ifdef ROS_KERNEL
28         TAILQ_ENTRY(vcore)      list;
29 #else /* userspace */
30         void                            *dummy_ptr1;
31         void                            *dummy_ptr2;
32 #endif /* ROS_KERNEL */
33         uint32_t                        pcoreid;
34         bool                            valid;
35         uint32_t                        nr_preempts_sent;       /* these two differ when a preempt*/
36         uint32_t                        nr_preempts_done;       /* is in flight. */
37         uint64_t                        preempt_pending;
38         /* A process can see cumulative runtime as of the last resume, and can also
39          * calculate runtime in this interval, by adding (ns - resume) + total. */
40         uint64_t                        resume_ticks;           /* TSC at resume time */
41         uint64_t                        total_ticks;            /* ticks up to last offlining */
42 };
43
44 struct pcore {
45         uint32_t                        vcoreid;
46         bool                            valid;
47 };
48
49 typedef struct procinfo {
50         pid_t pid;
51         pid_t ppid;
52         size_t max_vcores;      /* TODO: change to a uint32_t */
53         uint64_t tsc_freq;
54         uint64_t timing_overhead;
55         void *heap_bottom;
56         /* glibc relies on stuff above this point.  if you change it, you need to
57          * rebuild glibc. */
58         bool is_mcp;                    /* is in multi mode */
59         unsigned long           res_grant[MAX_NUM_RESOURCES];
60         struct vcore            vcoremap[MAX_NUM_CORES];
61         uint32_t                        num_vcores;
62         struct pcore            pcoremap[MAX_NUM_CORES];
63         seq_ctr_t                       coremap_seqctr;
64 } procinfo_t;
65 #define PROCINFO_NUM_PAGES  ((sizeof(procinfo_t)-1)/PGSIZE + 1)
66
67 /* We align this so that the kernel can easily allocate it in the BSS */
68 struct proc_global_info {
69         unsigned long cpu_feats[__NR_CPU_FEAT_BITS];
70         uint64_t x86_default_xcr0;
71         uint64_t tsc_freq;
72         uint64_t tsc_overhead;
73         uint64_t bus_freq;
74 } __attribute__((aligned(PGSIZE)));
75 #define PROCGINFO_NUM_PAGES  (sizeof(struct proc_global_info) / PGSIZE)
76
77 #ifdef ROS_KERNEL
78
79 /* defined in init.c */
80 extern struct proc_global_info __proc_global_info;
81
82 #else /* Userland */
83
84 #define __procinfo (*(procinfo_t*)UINFO)
85 #define __proc_global_info (*(struct proc_global_info*)UGINFO)
86
87 #include <ros/common.h>
88 #include <ros/atomic.h>
89 #include <ros/syscall.h>
90
91 /* Figure out what your vcoreid is from your pcoreid and procinfo.  Only low
92  * level or debugging code should call this. */
93 static inline uint32_t __get_vcoreid_from_procinfo(void)
94 {
95         /* The assumption is that any IPIs/KMSGs would knock userspace into the
96          * kernel before it could read the closing of the seqctr.  Put another way,
97          * there is a 'memory barrier' between the IPI write and the seqctr write.
98          * I think this is true. */
99         uint32_t kpcoreid, kvcoreid;
100         extern long __ros_syscall_noerrno(unsigned int _num, long _a0, long _a1,
101                                           long _a2, long _a3, long _a4, long _a5);
102
103         seq_ctr_t old_seq;
104         do {
105                 cmb();
106                 old_seq = __procinfo.coremap_seqctr;
107                 kpcoreid = __ros_syscall_noerrno(SYS_getpcoreid, 0, 0, 0, 0, 0, 0);
108                 if (!__procinfo.pcoremap[kpcoreid].valid)
109                         continue;
110                 kvcoreid = __procinfo.pcoremap[kpcoreid].vcoreid;
111         } while (seqctr_retry(old_seq, __procinfo.coremap_seqctr));
112         return kvcoreid;
113 }
114
115 static inline uint32_t __get_vcoreid(void)
116 {
117         /* since sys_getvcoreid could lie (and might never change) */
118         return __get_vcoreid_from_procinfo();
119 }
120
121 #endif /* ifndef ROS_KERNEL */