Marc Bonnici | 8e1a755 | 2021-12-01 17:57:04 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2022, ARM Limited and Contributors. All rights reserved. |
| 3 | * |
| 4 | * SPDX-License-Identifier: BSD-3-Clause |
| 5 | */ |
| 6 | |
| 7 | #include <assert.h> |
| 8 | #include <errno.h> |
| 9 | |
| 10 | #include <arch_helpers.h> |
| 11 | #include <bl31/bl31.h> |
| 12 | #include <bl31/ehf.h> |
| 13 | #include <common/debug.h> |
| 14 | #include <common/fdt_wrappers.h> |
| 15 | #include <common/runtime_svc.h> |
| 16 | #include <lib/el3_runtime/context_mgmt.h> |
| 17 | #include <lib/smccc.h> |
| 18 | #include <lib/utils.h> |
| 19 | #include <lib/xlat_tables/xlat_tables_v2.h> |
| 20 | #include <libfdt.h> |
| 21 | #include <plat/common/platform.h> |
| 22 | #include <services/ffa_svc.h> |
| 23 | #include <services/spmc_svc.h> |
| 24 | #include <services/spmd_svc.h> |
| 25 | #include "spmc.h" |
| 26 | |
| 27 | #include <platform_def.h> |
| 28 | |
| 29 | /* |
| 30 | * Allocate a secure partition descriptor to describe each SP in the system that |
| 31 | * does not reside at EL3. |
| 32 | */ |
| 33 | static struct secure_partition_desc sp_desc[SECURE_PARTITION_COUNT]; |
| 34 | |
| 35 | /* |
| 36 | * Allocate an NS endpoint descriptor to describe each VM and the Hypervisor in |
| 37 | * the system that interacts with a SP. It is used to track the Hypervisor |
| 38 | * buffer pair, version and ID for now. It could be extended to track VM |
| 39 | * properties when the SPMC supports indirect messaging. |
| 40 | */ |
| 41 | static struct ns_endpoint_desc ns_ep_desc[NS_PARTITION_COUNT]; |
| 42 | |
| 43 | /* |
| 44 | * Helper function to obtain the descriptor of the last SP to whom control was |
| 45 | * handed to on this physical cpu. Currently, we assume there is only one SP. |
| 46 | * TODO: Expand to track multiple partitions when required. |
| 47 | */ |
| 48 | struct secure_partition_desc *spmc_get_current_sp_ctx(void) |
| 49 | { |
| 50 | return &(sp_desc[ACTIVE_SP_DESC_INDEX]); |
| 51 | } |
| 52 | |
| 53 | /* |
| 54 | * Helper function to obtain the execution context of an SP on the |
| 55 | * current physical cpu. |
| 56 | */ |
| 57 | struct sp_exec_ctx *spmc_get_sp_ec(struct secure_partition_desc *sp) |
| 58 | { |
| 59 | return &(sp->ec[get_ec_index(sp)]); |
| 60 | } |
| 61 | |
| 62 | /* Helper function to get pointer to SP context from its ID. */ |
| 63 | struct secure_partition_desc *spmc_get_sp_ctx(uint16_t id) |
| 64 | { |
| 65 | /* Check for SWd Partitions. */ |
| 66 | for (unsigned int i = 0U; i < SECURE_PARTITION_COUNT; i++) { |
| 67 | if (sp_desc[i].sp_id == id) { |
| 68 | return &(sp_desc[i]); |
| 69 | } |
| 70 | } |
| 71 | return NULL; |
| 72 | } |
| 73 | |
| 74 | /****************************************************************************** |
| 75 | * This function returns to the place where spmc_sp_synchronous_entry() was |
| 76 | * called originally. |
| 77 | ******************************************************************************/ |
| 78 | __dead2 void spmc_sp_synchronous_exit(struct sp_exec_ctx *ec, uint64_t rc) |
| 79 | { |
| 80 | /* |
| 81 | * The SPM must have initiated the original request through a |
| 82 | * synchronous entry into the secure partition. Jump back to the |
| 83 | * original C runtime context with the value of rc in x0; |
| 84 | */ |
| 85 | spm_secure_partition_exit(ec->c_rt_ctx, rc); |
| 86 | |
| 87 | panic(); |
| 88 | } |
| 89 | |
| 90 | /******************************************************************************* |
| 91 | * Return FFA_ERROR with specified error code. |
| 92 | ******************************************************************************/ |
| 93 | uint64_t spmc_ffa_error_return(void *handle, int error_code) |
| 94 | { |
| 95 | SMC_RET8(handle, FFA_ERROR, |
| 96 | FFA_TARGET_INFO_MBZ, error_code, |
| 97 | FFA_PARAM_MBZ, FFA_PARAM_MBZ, FFA_PARAM_MBZ, |
| 98 | FFA_PARAM_MBZ, FFA_PARAM_MBZ); |
| 99 | } |
| 100 | |
| 101 | /****************************************************************************** |
| 102 | * Helper function to validate a secure partition ID to ensure it does not |
| 103 | * conflict with any other FF-A component and follows the convention to |
| 104 | * indicate it resides within the secure world. |
| 105 | ******************************************************************************/ |
| 106 | bool is_ffa_secure_id_valid(uint16_t partition_id) |
| 107 | { |
| 108 | /* Ensure the ID is not the invalid partition ID. */ |
| 109 | if (partition_id == INV_SP_ID) { |
| 110 | return false; |
| 111 | } |
| 112 | |
| 113 | /* Ensure the ID is not the SPMD ID. */ |
| 114 | if (partition_id == SPMD_DIRECT_MSG_ENDPOINT_ID) { |
| 115 | return false; |
| 116 | } |
| 117 | |
| 118 | /* |
| 119 | * Ensure the ID follows the convention to indicate it resides |
| 120 | * in the secure world. |
| 121 | */ |
| 122 | if (!ffa_is_secure_world_id(partition_id)) { |
| 123 | return false; |
| 124 | } |
| 125 | |
| 126 | /* Ensure we don't conflict with the SPMC partition ID. */ |
| 127 | if (partition_id == FFA_SPMC_ID) { |
| 128 | return false; |
| 129 | } |
| 130 | |
| 131 | /* Ensure we do not already have an SP context with this ID. */ |
| 132 | if (spmc_get_sp_ctx(partition_id)) { |
| 133 | return false; |
| 134 | } |
| 135 | |
| 136 | return true; |
| 137 | } |
| 138 | |
| 139 | /******************************************************************************* |
| 140 | * This function will parse the Secure Partition Manifest. From manifest, it |
| 141 | * will fetch details for preparing Secure partition image context and secure |
| 142 | * partition image boot arguments if any. |
| 143 | ******************************************************************************/ |
| 144 | static int sp_manifest_parse(void *sp_manifest, int offset, |
| 145 | struct secure_partition_desc *sp, |
| 146 | entry_point_info_t *ep_info) |
| 147 | { |
| 148 | int32_t ret, node; |
| 149 | uint32_t config_32; |
| 150 | |
| 151 | /* |
| 152 | * Look for the mandatory fields that are expected to be present in |
| 153 | * the SP manifests. |
| 154 | */ |
| 155 | node = fdt_path_offset(sp_manifest, "/"); |
| 156 | if (node < 0) { |
| 157 | ERROR("Did not find root node.\n"); |
| 158 | return node; |
| 159 | } |
| 160 | |
| 161 | ret = fdt_read_uint32(sp_manifest, node, "exception-level", &config_32); |
| 162 | if (ret != 0) { |
| 163 | ERROR("Missing SP Exception Level information.\n"); |
| 164 | return ret; |
| 165 | } |
| 166 | |
| 167 | sp->runtime_el = config_32; |
| 168 | |
| 169 | ret = fdt_read_uint32(sp_manifest, node, "ffa-version", &config_32); |
| 170 | if (ret != 0) { |
| 171 | ERROR("Missing Secure Partition FF-A Version.\n"); |
| 172 | return ret; |
| 173 | } |
| 174 | |
| 175 | sp->ffa_version = config_32; |
| 176 | |
| 177 | ret = fdt_read_uint32(sp_manifest, node, "execution-state", &config_32); |
| 178 | if (ret != 0) { |
| 179 | ERROR("Missing Secure Partition Execution State.\n"); |
| 180 | return ret; |
| 181 | } |
| 182 | |
| 183 | sp->execution_state = config_32; |
| 184 | |
| 185 | /* |
| 186 | * Look for the optional fields that are expected to be present in |
| 187 | * an SP manifest. |
| 188 | */ |
| 189 | ret = fdt_read_uint32(sp_manifest, node, "id", &config_32); |
| 190 | if (ret != 0) { |
| 191 | WARN("Missing Secure Partition ID.\n"); |
| 192 | } else { |
| 193 | if (!is_ffa_secure_id_valid(config_32)) { |
| 194 | ERROR("Invalid Secure Partition ID (0x%x).\n", |
| 195 | config_32); |
| 196 | return -EINVAL; |
| 197 | } |
| 198 | sp->sp_id = config_32; |
| 199 | } |
| 200 | |
| 201 | return 0; |
| 202 | } |
| 203 | |
| 204 | /******************************************************************************* |
| 205 | * This function gets the Secure Partition Manifest base and maps the manifest |
| 206 | * region. |
| 207 | * Currently only one Secure Partition manifest is considered which is used to |
| 208 | * prepare the context for the single Secure Partition. |
| 209 | ******************************************************************************/ |
| 210 | static int find_and_prepare_sp_context(void) |
| 211 | { |
| 212 | void *sp_manifest; |
| 213 | uintptr_t manifest_base; |
| 214 | uintptr_t manifest_base_align; |
| 215 | entry_point_info_t *next_image_ep_info; |
| 216 | int32_t ret; |
| 217 | struct secure_partition_desc *sp; |
| 218 | |
| 219 | next_image_ep_info = bl31_plat_get_next_image_ep_info(SECURE); |
| 220 | if (next_image_ep_info == NULL) { |
| 221 | WARN("No Secure Partition image provided by BL2.\n"); |
| 222 | return -ENOENT; |
| 223 | } |
| 224 | |
| 225 | sp_manifest = (void *)next_image_ep_info->args.arg0; |
| 226 | if (sp_manifest == NULL) { |
| 227 | WARN("Secure Partition manifest absent.\n"); |
| 228 | return -ENOENT; |
| 229 | } |
| 230 | |
| 231 | manifest_base = (uintptr_t)sp_manifest; |
| 232 | manifest_base_align = page_align(manifest_base, DOWN); |
| 233 | |
| 234 | /* |
| 235 | * Map the secure partition manifest region in the EL3 translation |
| 236 | * regime. |
| 237 | * Map an area equal to (2 * PAGE_SIZE) for now. During manifest base |
| 238 | * alignment the region of 1 PAGE_SIZE from manifest align base may |
| 239 | * not completely accommodate the secure partition manifest region. |
| 240 | */ |
| 241 | ret = mmap_add_dynamic_region((unsigned long long)manifest_base_align, |
| 242 | manifest_base_align, |
| 243 | PAGE_SIZE * 2, |
| 244 | MT_RO_DATA); |
| 245 | if (ret != 0) { |
| 246 | ERROR("Error while mapping SP manifest (%d).\n", ret); |
| 247 | return ret; |
| 248 | } |
| 249 | |
| 250 | ret = fdt_node_offset_by_compatible(sp_manifest, -1, |
| 251 | "arm,ffa-manifest-1.0"); |
| 252 | if (ret < 0) { |
| 253 | ERROR("Error happened in SP manifest reading.\n"); |
| 254 | return -EINVAL; |
| 255 | } |
| 256 | |
| 257 | /* |
| 258 | * Store the size of the manifest so that it can be used later to pass |
| 259 | * the manifest as boot information later. |
| 260 | */ |
| 261 | next_image_ep_info->args.arg1 = fdt_totalsize(sp_manifest); |
| 262 | INFO("Manifest size = %lu bytes.\n", next_image_ep_info->args.arg1); |
| 263 | |
| 264 | /* |
| 265 | * Select an SP descriptor for initialising the partition's execution |
| 266 | * context on the primary CPU. |
| 267 | */ |
| 268 | sp = spmc_get_current_sp_ctx(); |
| 269 | |
| 270 | /* Initialize entry point information for the SP */ |
| 271 | SET_PARAM_HEAD(next_image_ep_info, PARAM_EP, VERSION_1, |
| 272 | SECURE | EP_ST_ENABLE); |
| 273 | |
| 274 | /* Parse the SP manifest. */ |
| 275 | ret = sp_manifest_parse(sp_manifest, ret, sp, next_image_ep_info); |
| 276 | if (ret != 0) { |
| 277 | ERROR("Error in Secure Partition manifest parsing.\n"); |
| 278 | return ret; |
| 279 | } |
| 280 | |
| 281 | /* Check that the runtime EL in the manifest was correct. */ |
| 282 | if (sp->runtime_el != S_EL1) { |
| 283 | ERROR("Unexpected runtime EL: %d\n", sp->runtime_el); |
| 284 | return -EINVAL; |
| 285 | } |
| 286 | |
| 287 | /* Perform any common initialisation. */ |
| 288 | spmc_sp_common_setup(sp, next_image_ep_info); |
| 289 | |
| 290 | /* Perform any initialisation specific to S-EL1 SPs. */ |
| 291 | spmc_el1_sp_setup(sp, next_image_ep_info); |
| 292 | |
| 293 | /* Initialize the SP context with the required ep info. */ |
| 294 | spmc_sp_common_ep_commit(sp, next_image_ep_info); |
| 295 | |
| 296 | return 0; |
| 297 | } |
| 298 | |
| 299 | /******************************************************************************* |
| 300 | * This function takes an SP context pointer and performs a synchronous entry |
| 301 | * into it. |
| 302 | ******************************************************************************/ |
| 303 | uint64_t spmc_sp_synchronous_entry(struct sp_exec_ctx *ec) |
| 304 | { |
| 305 | uint64_t rc; |
| 306 | |
| 307 | assert(ec != NULL); |
| 308 | |
| 309 | /* Assign the context of the SP to this CPU */ |
| 310 | cm_set_context(&(ec->cpu_ctx), SECURE); |
| 311 | |
| 312 | /* Restore the context assigned above */ |
| 313 | cm_el1_sysregs_context_restore(SECURE); |
| 314 | cm_set_next_eret_context(SECURE); |
| 315 | |
| 316 | /* Invalidate TLBs at EL1. */ |
| 317 | tlbivmalle1(); |
| 318 | dsbish(); |
| 319 | |
| 320 | /* Enter Secure Partition */ |
| 321 | rc = spm_secure_partition_enter(&ec->c_rt_ctx); |
| 322 | |
| 323 | /* Save secure state */ |
| 324 | cm_el1_sysregs_context_save(SECURE); |
| 325 | |
| 326 | return rc; |
| 327 | } |
| 328 | |
| 329 | /******************************************************************************* |
| 330 | * SPMC Helper Functions. |
| 331 | ******************************************************************************/ |
| 332 | static int32_t sp_init(void) |
| 333 | { |
| 334 | uint64_t rc; |
| 335 | struct secure_partition_desc *sp; |
| 336 | struct sp_exec_ctx *ec; |
| 337 | |
| 338 | sp = spmc_get_current_sp_ctx(); |
| 339 | ec = spmc_get_sp_ec(sp); |
| 340 | ec->rt_model = RT_MODEL_INIT; |
| 341 | ec->rt_state = RT_STATE_RUNNING; |
| 342 | |
| 343 | INFO("Secure Partition (0x%x) init start.\n", sp->sp_id); |
| 344 | |
| 345 | rc = spmc_sp_synchronous_entry(ec); |
| 346 | if (rc != 0) { |
| 347 | /* Indicate SP init was not successful. */ |
| 348 | ERROR("SP (0x%x) failed to initialize (%lu).\n", |
| 349 | sp->sp_id, rc); |
| 350 | return 0; |
| 351 | } |
| 352 | |
| 353 | ec->rt_state = RT_STATE_WAITING; |
| 354 | INFO("Secure Partition initialized.\n"); |
| 355 | |
| 356 | return 1; |
| 357 | } |
| 358 | |
| 359 | static void initalize_sp_descs(void) |
| 360 | { |
| 361 | struct secure_partition_desc *sp; |
| 362 | |
| 363 | for (unsigned int i = 0U; i < SECURE_PARTITION_COUNT; i++) { |
| 364 | sp = &sp_desc[i]; |
| 365 | sp->sp_id = INV_SP_ID; |
| 366 | sp->secondary_ep = 0; |
| 367 | } |
| 368 | } |
| 369 | |
| 370 | static void initalize_ns_ep_descs(void) |
| 371 | { |
| 372 | struct ns_endpoint_desc *ns_ep; |
| 373 | |
| 374 | for (unsigned int i = 0U; i < NS_PARTITION_COUNT; i++) { |
| 375 | ns_ep = &ns_ep_desc[i]; |
| 376 | /* |
| 377 | * Clashes with the Hypervisor ID but will not be a |
| 378 | * problem in practice. |
| 379 | */ |
| 380 | ns_ep->ns_ep_id = 0; |
| 381 | ns_ep->ffa_version = 0; |
| 382 | } |
| 383 | } |
| 384 | |
| 385 | /******************************************************************************* |
Marc Bonnici | 1c33cc3 | 2021-11-29 17:57:03 +0000 | [diff] [blame^] | 386 | * Initialize SPMC attributes for the SPMD. |
| 387 | ******************************************************************************/ |
| 388 | void spmc_populate_attrs(spmc_manifest_attribute_t *spmc_attrs) |
| 389 | { |
| 390 | spmc_attrs->major_version = FFA_VERSION_MAJOR; |
| 391 | spmc_attrs->minor_version = FFA_VERSION_MINOR; |
| 392 | spmc_attrs->exec_state = MODE_RW_64; |
| 393 | spmc_attrs->spmc_id = FFA_SPMC_ID; |
| 394 | } |
| 395 | |
| 396 | /******************************************************************************* |
Marc Bonnici | 8e1a755 | 2021-12-01 17:57:04 +0000 | [diff] [blame] | 397 | * Initialize contexts of all Secure Partitions. |
| 398 | ******************************************************************************/ |
| 399 | int32_t spmc_setup(void) |
| 400 | { |
| 401 | int32_t ret; |
| 402 | |
| 403 | /* Initialize endpoint descriptors */ |
| 404 | initalize_sp_descs(); |
| 405 | initalize_ns_ep_descs(); |
| 406 | |
| 407 | /* Perform physical SP setup. */ |
| 408 | |
| 409 | /* Disable MMU at EL1 (initialized by BL2) */ |
| 410 | disable_mmu_icache_el1(); |
| 411 | |
| 412 | /* Initialize context of the SP */ |
| 413 | INFO("Secure Partition context setup start.\n"); |
| 414 | |
| 415 | ret = find_and_prepare_sp_context(); |
| 416 | if (ret != 0) { |
| 417 | ERROR("Error in SP finding and context preparation.\n"); |
| 418 | return ret; |
| 419 | } |
| 420 | |
| 421 | /* Register init function for deferred init. */ |
| 422 | bl31_register_bl32_init(&sp_init); |
| 423 | |
| 424 | INFO("Secure Partition setup done.\n"); |
| 425 | |
| 426 | return 0; |
| 427 | } |
| 428 | |
| 429 | /******************************************************************************* |
| 430 | * Secure Partition Manager SMC handler. |
| 431 | ******************************************************************************/ |
| 432 | uint64_t spmc_smc_handler(uint32_t smc_fid, |
| 433 | bool secure_origin, |
| 434 | uint64_t x1, |
| 435 | uint64_t x2, |
| 436 | uint64_t x3, |
| 437 | uint64_t x4, |
| 438 | void *cookie, |
| 439 | void *handle, |
| 440 | uint64_t flags) |
| 441 | { |
| 442 | switch (smc_fid) { |
| 443 | |
| 444 | default: |
| 445 | WARN("Unsupported FF-A call 0x%08x.\n", smc_fid); |
| 446 | break; |
| 447 | } |
| 448 | return spmc_ffa_error_return(handle, FFA_ERROR_NOT_SUPPORTED); |
| 449 | } |