Nathan Fontenot | ab519a0 | 2009-11-24 21:10:49 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Support for dynamic reconfiguration for PCI, Memory, and CPU |
| 3 | * Hotplug and Dynamic Logical Partitioning on RPA platforms. |
| 4 | * |
| 5 | * Copyright (C) 2009 Nathan Fontenot |
| 6 | * Copyright (C) 2009 IBM Corporation |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or |
| 9 | * modify it under the terms of the GNU General Public License version |
| 10 | * 2 as published by the Free Software Foundation. |
| 11 | */ |
| 12 | |
| 13 | #include <linux/kernel.h> |
| 14 | #include <linux/kref.h> |
| 15 | #include <linux/notifier.h> |
| 16 | #include <linux/proc_fs.h> |
| 17 | #include <linux/spinlock.h> |
| 18 | #include <linux/cpu.h> |
| 19 | |
| 20 | #include <asm/prom.h> |
| 21 | #include <asm/machdep.h> |
| 22 | #include <asm/uaccess.h> |
| 23 | #include <asm/rtas.h> |
| 24 | #include <asm/pSeries_reconfig.h> |
| 25 | |
| 26 | struct cc_workarea { |
| 27 | u32 drc_index; |
| 28 | u32 zero; |
| 29 | u32 name_offset; |
| 30 | u32 prop_length; |
| 31 | u32 prop_offset; |
| 32 | }; |
| 33 | |
| 34 | static void dlpar_free_cc_property(struct property *prop) |
| 35 | { |
| 36 | kfree(prop->name); |
| 37 | kfree(prop->value); |
| 38 | kfree(prop); |
| 39 | } |
| 40 | |
| 41 | static struct property *dlpar_parse_cc_property(struct cc_workarea *ccwa) |
| 42 | { |
| 43 | struct property *prop; |
| 44 | char *name; |
| 45 | char *value; |
| 46 | |
| 47 | prop = kzalloc(sizeof(*prop), GFP_KERNEL); |
| 48 | if (!prop) |
| 49 | return NULL; |
| 50 | |
| 51 | name = (char *)ccwa + ccwa->name_offset; |
| 52 | prop->name = kstrdup(name, GFP_KERNEL); |
| 53 | |
| 54 | prop->length = ccwa->prop_length; |
| 55 | value = (char *)ccwa + ccwa->prop_offset; |
| 56 | prop->value = kzalloc(prop->length, GFP_KERNEL); |
| 57 | if (!prop->value) { |
| 58 | dlpar_free_cc_property(prop); |
| 59 | return NULL; |
| 60 | } |
| 61 | |
| 62 | memcpy(prop->value, value, prop->length); |
| 63 | return prop; |
| 64 | } |
| 65 | |
| 66 | static struct device_node *dlpar_parse_cc_node(struct cc_workarea *ccwa) |
| 67 | { |
| 68 | struct device_node *dn; |
| 69 | char *name; |
| 70 | |
| 71 | dn = kzalloc(sizeof(*dn), GFP_KERNEL); |
| 72 | if (!dn) |
| 73 | return NULL; |
| 74 | |
| 75 | /* The configure connector reported name does not contain a |
| 76 | * preceeding '/', so we allocate a buffer large enough to |
| 77 | * prepend this to the full_name. |
| 78 | */ |
| 79 | name = (char *)ccwa + ccwa->name_offset; |
| 80 | dn->full_name = kmalloc(strlen(name) + 2, GFP_KERNEL); |
| 81 | if (!dn->full_name) { |
| 82 | kfree(dn); |
| 83 | return NULL; |
| 84 | } |
| 85 | |
| 86 | sprintf(dn->full_name, "/%s", name); |
| 87 | return dn; |
| 88 | } |
| 89 | |
| 90 | static void dlpar_free_one_cc_node(struct device_node *dn) |
| 91 | { |
| 92 | struct property *prop; |
| 93 | |
| 94 | while (dn->properties) { |
| 95 | prop = dn->properties; |
| 96 | dn->properties = prop->next; |
| 97 | dlpar_free_cc_property(prop); |
| 98 | } |
| 99 | |
| 100 | kfree(dn->full_name); |
| 101 | kfree(dn); |
| 102 | } |
| 103 | |
| 104 | static void dlpar_free_cc_nodes(struct device_node *dn) |
| 105 | { |
| 106 | if (dn->child) |
| 107 | dlpar_free_cc_nodes(dn->child); |
| 108 | |
| 109 | if (dn->sibling) |
| 110 | dlpar_free_cc_nodes(dn->sibling); |
| 111 | |
| 112 | dlpar_free_one_cc_node(dn); |
| 113 | } |
| 114 | |
| 115 | #define NEXT_SIBLING 1 |
| 116 | #define NEXT_CHILD 2 |
| 117 | #define NEXT_PROPERTY 3 |
| 118 | #define PREV_PARENT 4 |
| 119 | #define MORE_MEMORY 5 |
| 120 | #define CALL_AGAIN -2 |
| 121 | #define ERR_CFG_USE -9003 |
| 122 | |
| 123 | struct device_node *dlpar_configure_connector(u32 drc_index) |
| 124 | { |
| 125 | struct device_node *dn; |
| 126 | struct device_node *first_dn = NULL; |
| 127 | struct device_node *last_dn = NULL; |
| 128 | struct property *property; |
| 129 | struct property *last_property = NULL; |
| 130 | struct cc_workarea *ccwa; |
| 131 | int cc_token; |
| 132 | int rc; |
| 133 | |
| 134 | cc_token = rtas_token("ibm,configure-connector"); |
| 135 | if (cc_token == RTAS_UNKNOWN_SERVICE) |
| 136 | return NULL; |
| 137 | |
| 138 | spin_lock(&rtas_data_buf_lock); |
| 139 | ccwa = (struct cc_workarea *)&rtas_data_buf[0]; |
| 140 | ccwa->drc_index = drc_index; |
| 141 | ccwa->zero = 0; |
| 142 | |
| 143 | rc = rtas_call(cc_token, 2, 1, NULL, rtas_data_buf, NULL); |
| 144 | while (rc) { |
| 145 | switch (rc) { |
| 146 | case NEXT_SIBLING: |
| 147 | dn = dlpar_parse_cc_node(ccwa); |
| 148 | if (!dn) |
| 149 | goto cc_error; |
| 150 | |
| 151 | dn->parent = last_dn->parent; |
| 152 | last_dn->sibling = dn; |
| 153 | last_dn = dn; |
| 154 | break; |
| 155 | |
| 156 | case NEXT_CHILD: |
| 157 | dn = dlpar_parse_cc_node(ccwa); |
| 158 | if (!dn) |
| 159 | goto cc_error; |
| 160 | |
| 161 | if (!first_dn) |
| 162 | first_dn = dn; |
| 163 | else { |
| 164 | dn->parent = last_dn; |
| 165 | if (last_dn) |
| 166 | last_dn->child = dn; |
| 167 | } |
| 168 | |
| 169 | last_dn = dn; |
| 170 | break; |
| 171 | |
| 172 | case NEXT_PROPERTY: |
| 173 | property = dlpar_parse_cc_property(ccwa); |
| 174 | if (!property) |
| 175 | goto cc_error; |
| 176 | |
| 177 | if (!last_dn->properties) |
| 178 | last_dn->properties = property; |
| 179 | else |
| 180 | last_property->next = property; |
| 181 | |
| 182 | last_property = property; |
| 183 | break; |
| 184 | |
| 185 | case PREV_PARENT: |
| 186 | last_dn = last_dn->parent; |
| 187 | break; |
| 188 | |
| 189 | case CALL_AGAIN: |
| 190 | break; |
| 191 | |
| 192 | case MORE_MEMORY: |
| 193 | case ERR_CFG_USE: |
| 194 | default: |
| 195 | printk(KERN_ERR "Unexpected Error (%d) " |
| 196 | "returned from configure-connector\n", rc); |
| 197 | goto cc_error; |
| 198 | } |
| 199 | |
| 200 | rc = rtas_call(cc_token, 2, 1, NULL, rtas_data_buf, NULL); |
| 201 | } |
| 202 | |
| 203 | spin_unlock(&rtas_data_buf_lock); |
| 204 | return first_dn; |
| 205 | |
| 206 | cc_error: |
| 207 | if (first_dn) |
| 208 | dlpar_free_cc_nodes(first_dn); |
| 209 | spin_unlock(&rtas_data_buf_lock); |
| 210 | return NULL; |
| 211 | } |
| 212 | |
| 213 | static struct device_node *derive_parent(const char *path) |
| 214 | { |
| 215 | struct device_node *parent; |
| 216 | char *last_slash; |
| 217 | |
| 218 | last_slash = strrchr(path, '/'); |
| 219 | if (last_slash == path) { |
| 220 | parent = of_find_node_by_path("/"); |
| 221 | } else { |
| 222 | char *parent_path; |
| 223 | int parent_path_len = last_slash - path + 1; |
| 224 | parent_path = kmalloc(parent_path_len, GFP_KERNEL); |
| 225 | if (!parent_path) |
| 226 | return NULL; |
| 227 | |
| 228 | strlcpy(parent_path, path, parent_path_len); |
| 229 | parent = of_find_node_by_path(parent_path); |
| 230 | kfree(parent_path); |
| 231 | } |
| 232 | |
| 233 | return parent; |
| 234 | } |
| 235 | |
| 236 | int dlpar_attach_node(struct device_node *dn) |
| 237 | { |
| 238 | struct proc_dir_entry *ent; |
| 239 | int rc; |
| 240 | |
| 241 | of_node_set_flag(dn, OF_DYNAMIC); |
| 242 | kref_init(&dn->kref); |
| 243 | dn->parent = derive_parent(dn->full_name); |
| 244 | if (!dn->parent) |
| 245 | return -ENOMEM; |
| 246 | |
| 247 | rc = blocking_notifier_call_chain(&pSeries_reconfig_chain, |
| 248 | PSERIES_RECONFIG_ADD, dn); |
| 249 | if (rc == NOTIFY_BAD) { |
| 250 | printk(KERN_ERR "Failed to add device node %s\n", |
| 251 | dn->full_name); |
| 252 | return -ENOMEM; /* For now, safe to assume kmalloc failure */ |
| 253 | } |
| 254 | |
| 255 | of_attach_node(dn); |
| 256 | |
| 257 | #ifdef CONFIG_PROC_DEVICETREE |
| 258 | ent = proc_mkdir(strrchr(dn->full_name, '/') + 1, dn->parent->pde); |
| 259 | if (ent) |
| 260 | proc_device_tree_add_node(dn, ent); |
| 261 | #endif |
| 262 | |
| 263 | of_node_put(dn->parent); |
| 264 | return 0; |
| 265 | } |
| 266 | |
| 267 | int dlpar_detach_node(struct device_node *dn) |
| 268 | { |
| 269 | struct device_node *parent = dn->parent; |
| 270 | struct property *prop = dn->properties; |
| 271 | |
| 272 | #ifdef CONFIG_PROC_DEVICETREE |
| 273 | while (prop) { |
| 274 | remove_proc_entry(prop->name, dn->pde); |
| 275 | prop = prop->next; |
| 276 | } |
| 277 | |
| 278 | if (dn->pde) |
| 279 | remove_proc_entry(dn->pde->name, parent->pde); |
| 280 | #endif |
| 281 | |
| 282 | blocking_notifier_call_chain(&pSeries_reconfig_chain, |
| 283 | PSERIES_RECONFIG_REMOVE, dn); |
| 284 | of_detach_node(dn); |
| 285 | of_node_put(dn); /* Must decrement the refcount */ |
| 286 | |
| 287 | return 0; |
| 288 | } |
| 289 | |
| 290 | #define DR_ENTITY_SENSE 9003 |
| 291 | #define DR_ENTITY_PRESENT 1 |
| 292 | #define DR_ENTITY_UNUSABLE 2 |
| 293 | #define ALLOCATION_STATE 9003 |
| 294 | #define ALLOC_UNUSABLE 0 |
| 295 | #define ALLOC_USABLE 1 |
| 296 | #define ISOLATION_STATE 9001 |
| 297 | #define ISOLATE 0 |
| 298 | #define UNISOLATE 1 |
| 299 | |
| 300 | int dlpar_acquire_drc(u32 drc_index) |
| 301 | { |
| 302 | int dr_status, rc; |
| 303 | |
| 304 | rc = rtas_call(rtas_token("get-sensor-state"), 2, 2, &dr_status, |
| 305 | DR_ENTITY_SENSE, drc_index); |
| 306 | if (rc || dr_status != DR_ENTITY_UNUSABLE) |
| 307 | return -1; |
| 308 | |
| 309 | rc = rtas_set_indicator(ALLOCATION_STATE, drc_index, ALLOC_USABLE); |
| 310 | if (rc) |
| 311 | return rc; |
| 312 | |
| 313 | rc = rtas_set_indicator(ISOLATION_STATE, drc_index, UNISOLATE); |
| 314 | if (rc) { |
| 315 | rtas_set_indicator(ALLOCATION_STATE, drc_index, ALLOC_UNUSABLE); |
| 316 | return rc; |
| 317 | } |
| 318 | |
| 319 | return 0; |
| 320 | } |
| 321 | |
| 322 | int dlpar_release_drc(u32 drc_index) |
| 323 | { |
| 324 | int dr_status, rc; |
| 325 | |
| 326 | rc = rtas_call(rtas_token("get-sensor-state"), 2, 2, &dr_status, |
| 327 | DR_ENTITY_SENSE, drc_index); |
| 328 | if (rc || dr_status != DR_ENTITY_PRESENT) |
| 329 | return -1; |
| 330 | |
| 331 | rc = rtas_set_indicator(ISOLATION_STATE, drc_index, ISOLATE); |
| 332 | if (rc) |
| 333 | return rc; |
| 334 | |
| 335 | rc = rtas_set_indicator(ALLOCATION_STATE, drc_index, ALLOC_UNUSABLE); |
| 336 | if (rc) { |
| 337 | rtas_set_indicator(ISOLATION_STATE, drc_index, UNISOLATE); |
| 338 | return rc; |
| 339 | } |
| 340 | |
| 341 | return 0; |
| 342 | } |
| 343 | |
| 344 | |