1 /* ProcFS - service.c - the service subdirectory */ 2 3 #include "inc.h" 4 5 #include <minix/rs.h> 6 #include "rs/const.h" 7 #include "rs/type.h" 8 9 enum policy { 10 POL_NONE = 0x00, /* user | endpoint */ 11 POL_RESET = 0x01, /* visible | change */ 12 POL_RESTART = 0x02, /* transparent | preserved */ 13 POL_LIVE_UPDATE = 0x04 /* transparent | preserved */ 14 }; 15 16 struct policies { 17 #define MAX_POL_FORMAT_SZ 20 18 char formatted[MAX_POL_FORMAT_SZ]; 19 enum policy supported; 20 }; 21 22 typedef struct { 23 struct rproc proc[NR_SYS_PROCS]; 24 struct rprocpub pub[NR_SYS_PROCS]; 25 } ixfer_rproc_t; 26 static ixfer_rproc_t rproc; 27 28 static struct policies policies[NR_SYS_PROCS]; 29 30 static struct inode *service_node; 31 32 /* Updates the policies state from RS. Always returns an ASCIIZ string. */ 33 static const char * 34 service_get_policies(struct policies * pol, index_t slot) 35 { 36 #if 1 /* The following should be retrieved from RS and formated instead. */ 37 int pos; 38 char *ref_label; 39 static const struct { 40 const char *label; 41 const char *policy_str; 42 } def_pol[] = { 43 /* audio */ 44 { .label = "es1370", .policy_str = "reset" }, 45 { .label = "es1371", .policy_str = "reset" }, 46 { .label = "sb16", .policy_str = "reset" }, 47 /* bus */ 48 { .label = "i2c", .policy_str = "restart" }, 49 { .label = "pci", .policy_str = "restart" }, 50 { .label = "ti1225", .policy_str = "restart" }, 51 /* clock */ 52 { .label = "readclock.drv", .policy_str = "restart" }, 53 /* eeprom */ 54 { .label = "cat24c256", .policy_str = "restart" }, 55 /* examples */ 56 { .label = "hello", .policy_str = "restart" }, 57 /* hid */ 58 { .label = "pckbd", .policy_str = "reset" }, 59 /* iommu */ 60 { .label = "amddev", .policy_str = "" }, 61 /* net */ 62 { .label = "3c90x", .policy_str = "reset" }, 63 { .label = "atl2", .policy_str = "reset" }, 64 { .label = "dec21140A", .policy_str = "reset" }, 65 { .label = "dp8390", .policy_str = "reset" }, 66 { .label = "dpeth", .policy_str = "reset" }, 67 { .label = "e1000", .policy_str = "reset" }, 68 { .label = "fxp", .policy_str = "reset" }, 69 { .label = "lance", .policy_str = "reset" }, 70 { .label = "lan8710a", .policy_str = "reset" }, 71 { .label = "orinoco", .policy_str = "reset" }, 72 { .label = "rtl8139", .policy_str = "reset" }, 73 { .label = "rtl8169", .policy_str = "reset" }, 74 { .label = "uds", .policy_str = "reset" }, 75 { .label = "virtio_net", .policy_str = "reset" }, 76 { .label = "vt6105", .policy_str = "reset" }, 77 /* power */ 78 { .label = "acpi", .policy_str = "" }, 79 { .label = "tps65217", .policy_str = "" }, 80 { .label = "tps65590", .policy_str = "" }, 81 /* printer */ 82 { .label = "printer", .policy_str = "restart" }, 83 /* sensors */ 84 { .label = "bmp085", .policy_str = "" }, 85 { .label = "sht21", .policy_str = "restart" }, 86 { .label = "tsl2550", .policy_str = "restart" }, 87 /* storage */ 88 { .label = "ahci", .policy_str = "reset" }, 89 { .label = "at_wini", .policy_str = "reset" }, 90 { .label = "fbd", .policy_str = "reset" }, 91 { .label = "filter", .policy_str = "reset" }, 92 { .label = "floppy", .policy_str = "reset" }, 93 { .label = "memory", .policy_str = "restart" }, 94 { .label = "mmc", .policy_str = "reset" }, 95 { .label = "virtio_blk", .policy_str = "reset" }, 96 { .label = "vnd", .policy_str = "reset" }, 97 /* system */ 98 { .label = "gpio", .policy_str = "restart" }, 99 { .label = "log", .policy_str = "reset" }, 100 { .label = "random", .policy_str = "restart" }, 101 /* tty */ 102 { .label = "pty", .policy_str = "restart" }, 103 { .label = "tty", .policy_str = "restart" }, 104 /* usb */ 105 { .label = "usbd", .policy_str = "" }, 106 { .label = "usb_hub", .policy_str = "" }, 107 { .label = "usb_storage", .policy_str = "" }, 108 /* video */ 109 { .label = "fb", .policy_str = "" }, 110 { .label = "tda19988", .policy_str = "" }, 111 /* vmm_guest */ 112 { .label = "vbox", .policy_str = "" }, 113 /* fs */ 114 { .label = "ext2", .policy_str = "" }, 115 { .label = "hgfs", .policy_str = "" }, 116 { .label = "isofs", .policy_str = "" }, 117 { .label = "mfs", .policy_str = "restart" }, 118 { .label = "pfs", .policy_str = "restart" }, 119 { .label = "procfs", .policy_str = "restart" }, 120 { .label = "ptyfs", .policy_str = "" }, 121 { .label = "vbfs", .policy_str = "" }, 122 /* net */ 123 { .label = "inet", .policy_str = "reset" }, 124 { .label = "lwip", .policy_str = "" }, 125 /* servers */ 126 { .label = "devman", .policy_str = "restart" }, 127 { .label = "ds", .policy_str = "restart" }, 128 { .label = "input", .policy_str = "reset" }, 129 { .label = "ipc", .policy_str = "restart" }, 130 { .label = "is", .policy_str = "restart" }, 131 { .label = "mib", .policy_str = "restart" }, 132 { .label = "pm", .policy_str = "restart" }, 133 { .label = "rs", .policy_str = "restart" }, 134 { .label = "sched", .policy_str = "restart" }, 135 { .label = "vfs", .policy_str = "restart" }, 136 { .label = "vm", .policy_str = "restart" }, 137 //{ .label = "", .policy_str = "" }, 138 }; 139 140 /* Find the related policy, based on the file name of the service. */ 141 ref_label = strrchr(rproc.pub[slot].proc_name, '/'); 142 if (NULL == ref_label) 143 ref_label = rproc.pub[slot].proc_name; 144 145 memset(pol[slot].formatted, 0, MAX_POL_FORMAT_SZ); 146 for(pos = 0; pos < (sizeof(def_pol) / sizeof(def_pol[0])); pos++) { 147 if (0 == strcmp(ref_label, def_pol[pos].label)) { 148 (void)strncpy(pol[slot].formatted, 149 def_pol[pos].policy_str, MAX_POL_FORMAT_SZ); 150 pol[slot].formatted[MAX_POL_FORMAT_SZ-1] = '\0'; 151 break; 152 } 153 } 154 #else 155 /* Should do something sensible, based on flags from RS/SEF. */ 156 #endif 157 158 return pol[slot].formatted; 159 } 160 161 /* Returns a ASCIIZ string encoding RS flags. */ 162 static const char * 163 service_get_flags(index_t slot) 164 { 165 static char str[10]; 166 int flags, sys_flags; 167 168 flags = rproc.proc[slot].r_flags; 169 sys_flags = rproc.pub[slot].sys_flags; 170 171 str[0] = (flags & RS_ACTIVE) ? 'A' : '-'; 172 str[1] = (flags & RS_UPDATING) ? 'U' : '-'; 173 str[2] = (flags & RS_EXITING) ? 'E' : '-'; 174 str[3] = (flags & RS_NOPINGREPLY) ? 'N' : '-'; 175 str[4] = (sys_flags & SF_USE_COPY) ? 'C' : '-'; 176 str[5] = (sys_flags & SF_USE_REPL) ? 'R' : '-'; 177 str[6] = (sys_flags & SF_NEED_COPY) ? 'c' : '-'; 178 str[7] = (sys_flags & SF_NEED_REPL) ? 'r' : '-'; 179 str[8] = (sys_flags & SF_CORE_SRV) ? 's' : '-'; 180 str[9] = '\0'; 181 182 return str; 183 } 184 185 /* 186 * Return whether a slot is in use and active. The purpose of this check is 187 * to ensure that after eliminating all slots that do not pass this check, we 188 * are left with a set of live services each with a unique label. 189 */ 190 static int 191 service_active(index_t slot) 192 { 193 194 /* 195 * Init is in RS's process tables as the representation of user 196 * processes. It is not a system service. 197 */ 198 return ((rproc.proc[slot].r_flags & (RS_IN_USE | RS_ACTIVE)) == 199 (RS_IN_USE | RS_ACTIVE) && 200 rproc.pub[slot].endpoint != INIT_PROC_NR); 201 } 202 203 /* 204 * Update the contents of the service directory, by first updating the RS 205 * tables and then updating the directory contents. 206 */ 207 static void 208 service_update(void) 209 { 210 struct inode *node; 211 struct inode_stat stat; 212 index_t slot; 213 static int warned = FALSE; 214 int r; 215 216 /* There is not much we can do if this call fails. */ 217 r = getsysinfo(RS_PROC_NR, SI_PROCALL_TAB, &rproc, sizeof(rproc)); 218 if (r != OK && !warned) { 219 printf("PROCFS: unable to obtain RS tables (%d)\n", r); 220 warned = TRUE; 221 } 222 223 /* 224 * As with PIDs, we make two passes. Delete first, then add. This 225 * prevents problems in the hypothetical case that between updates, one 226 * slot ends up with the label name of a previous, different slot. 227 */ 228 for (slot = 0; slot < NR_SYS_PROCS; slot++) { 229 if ((node = get_inode_by_index(service_node, slot)) == NULL) 230 continue; 231 232 /* 233 * If the slot is no longer in use, or the label name does not 234 * match, the node must be deleted. 235 */ 236 if (!service_active(slot) || 237 strcmp(get_inode_name(node), rproc.pub[slot].label)) 238 delete_inode(node); 239 } 240 241 memset(&stat, 0, sizeof(stat)); 242 stat.mode = REG_ALL_MODE; 243 stat.uid = SUPER_USER; 244 stat.gid = SUPER_USER; 245 246 for (slot = 0; slot < NR_SYS_PROCS; slot++) { 247 if (!service_active(slot) || 248 get_inode_by_index(service_node, slot) != NULL) 249 continue; 250 251 node = add_inode(service_node, rproc.pub[slot].label, slot, 252 &stat, (index_t)0, (cbdata_t)slot); 253 254 if (node == NULL) 255 out_of_inodes(); 256 } 257 } 258 259 /* 260 * Initialize the service directory. 261 */ 262 void 263 service_init(void) 264 { 265 struct inode *root, *node; 266 struct inode_stat stat; 267 268 root = get_root_inode(); 269 270 memset(&stat, 0, sizeof(stat)); 271 stat.mode = DIR_ALL_MODE; 272 stat.uid = SUPER_USER; 273 stat.gid = SUPER_USER; 274 275 service_node = add_inode(root, "service", NO_INDEX, &stat, 276 NR_SYS_PROCS, NULL); 277 278 if (service_node == NULL) 279 panic("unable to create service node"); 280 } 281 282 /* 283 * A lookup request is being performed. If it is in the service directory, 284 * update the tables. We do this lazily, to reduce overhead. 285 */ 286 void 287 service_lookup(struct inode * parent, clock_t now) 288 { 289 static clock_t last_update = 0; 290 291 if (parent != service_node) 292 return; 293 294 if (last_update != now) { 295 service_update(); 296 297 last_update = now; 298 } 299 } 300 301 /* 302 * A getdents request is being performed. If it is in the service directory, 303 * update the tables. 304 */ 305 void 306 service_getdents(struct inode * node) 307 { 308 309 if (node != service_node) 310 return; 311 312 service_update(); 313 } 314 315 /* 316 * A read request is being performed. If it is on a file in the service 317 * directory, process the read request. We rely on the fact that any read 318 * call will have been preceded by a lookup, so its table entry has been 319 * updated very recently. 320 */ 321 void 322 service_read(struct inode * node) 323 { 324 struct inode *parent; 325 index_t slot; 326 struct rprocpub *rpub; 327 struct rproc *rp; 328 329 if (get_parent_inode(node) != service_node) 330 return; 331 332 slot = get_inode_index(node); 333 rpub = &rproc.pub[slot]; 334 rp = &rproc.proc[slot]; 335 336 /* TODO: add a large number of other fields! */ 337 buf_printf("filename: %s\n", rpub->proc_name); 338 buf_printf("endpoint: %d\n", rpub->endpoint); 339 buf_printf("pid: %d\n", rp->r_pid); 340 buf_printf("restarts: %d\n", rp->r_restarts); 341 buf_printf("flags: %s\n", service_get_flags(slot)); 342 buf_printf("policies: %s\n", service_get_policies(policies, slot)); 343 buf_printf("ASRcount: %u\n", rp->r_asr_count); 344 } 345