| 1 | // SPDX-License-Identifier: MIT |
| 2 | /* |
| 3 | * Copyright © 2023 Intel Corporation |
| 4 | */ |
| 5 | |
| 6 | #include <linux/bitfield.h> |
| 7 | #include <linux/delay.h> |
| 8 | #include <linux/fault-inject.h> |
| 9 | |
| 10 | #include <drm/drm_managed.h> |
| 11 | |
| 12 | #include <kunit/static_stub.h> |
| 13 | #include <kunit/test-bug.h> |
| 14 | |
| 15 | #include "abi/guc_actions_sriov_abi.h" |
| 16 | #include "abi/guc_relay_actions_abi.h" |
| 17 | #include "abi/guc_relay_communication_abi.h" |
| 18 | |
| 19 | #include "xe_assert.h" |
| 20 | #include "xe_device.h" |
| 21 | #include "xe_gt.h" |
| 22 | #include "xe_gt_sriov_printk.h" |
| 23 | #include "xe_gt_sriov_pf_service.h" |
| 24 | #include "xe_guc.h" |
| 25 | #include "xe_guc_ct.h" |
| 26 | #include "xe_guc_hxg_helpers.h" |
| 27 | #include "xe_guc_relay.h" |
| 28 | #include "xe_guc_relay_types.h" |
| 29 | #include "xe_sriov.h" |
| 30 | |
| 31 | /* |
| 32 | * How long should we wait for the response? |
| 33 | * XXX this value is subject for the profiling. |
| 34 | */ |
| 35 | #define RELAY_TIMEOUT_MSEC (2500) |
| 36 | |
| 37 | static void relays_worker_fn(struct work_struct *w); |
| 38 | |
| 39 | static struct xe_guc *relay_to_guc(struct xe_guc_relay *relay) |
| 40 | { |
| 41 | return container_of(relay, struct xe_guc, relay); |
| 42 | } |
| 43 | |
| 44 | static struct xe_guc_ct *relay_to_ct(struct xe_guc_relay *relay) |
| 45 | { |
| 46 | return &relay_to_guc(relay)->ct; |
| 47 | } |
| 48 | |
| 49 | static struct xe_gt *relay_to_gt(struct xe_guc_relay *relay) |
| 50 | { |
| 51 | return guc_to_gt(guc: relay_to_guc(relay)); |
| 52 | } |
| 53 | |
| 54 | static struct xe_device *relay_to_xe(struct xe_guc_relay *relay) |
| 55 | { |
| 56 | return gt_to_xe(relay_to_gt(relay)); |
| 57 | } |
| 58 | |
| 59 | #define XE_RELAY_DIAG_RATELIMIT_INTERVAL (10 * HZ) |
| 60 | #define XE_RELAY_DIAG_RATELIMIT_BURST 10 |
| 61 | |
| 62 | #define relay_ratelimit_printk(relay, _level, fmt...) ({ \ |
| 63 | typeof(relay) _r = (relay); \ |
| 64 | if (IS_ENABLED(CONFIG_DRM_XE_DEBUG_SRIOV) || \ |
| 65 | ___ratelimit(&_r->diag_ratelimit, "xe_guc_relay")) \ |
| 66 | xe_gt_sriov_##_level(relay_to_gt(_r), "relay: " fmt); \ |
| 67 | }) |
| 68 | |
| 69 | #define relay_assert(relay, condition) xe_gt_assert(relay_to_gt(relay), condition) |
| 70 | #define relay_notice(relay, msg...) relay_ratelimit_printk((relay), notice, msg) |
| 71 | #define relay_debug(relay, msg...) relay_ratelimit_printk((relay), dbg_verbose, msg) |
| 72 | |
| 73 | static int relay_get_totalvfs(struct xe_guc_relay *relay) |
| 74 | { |
| 75 | struct xe_device *xe = relay_to_xe(relay); |
| 76 | struct pci_dev *pdev = to_pci_dev(xe->drm.dev); |
| 77 | |
| 78 | KUNIT_STATIC_STUB_REDIRECT(relay_get_totalvfs, relay); |
| 79 | return IS_SRIOV_VF(xe) ? 0 : pci_sriov_get_totalvfs(dev: pdev); |
| 80 | } |
| 81 | |
| 82 | static bool relay_is_ready(struct xe_guc_relay *relay) |
| 83 | { |
| 84 | return mempool_initialized(pool: &relay->pool); |
| 85 | } |
| 86 | |
| 87 | static u32 relay_get_next_rid(struct xe_guc_relay *relay) |
| 88 | { |
| 89 | u32 rid; |
| 90 | |
| 91 | spin_lock(lock: &relay->lock); |
| 92 | rid = ++relay->last_rid; |
| 93 | spin_unlock(lock: &relay->lock); |
| 94 | |
| 95 | return rid; |
| 96 | } |
| 97 | |
| 98 | /** |
| 99 | * struct relay_transaction - internal data used to handle transactions |
| 100 | * |
| 101 | * Relation between struct relay_transaction members:: |
| 102 | * |
| 103 | * <-------------------- GUC_CTB_MAX_DWORDS --------------> |
| 104 | * <-------- GUC_RELAY_MSG_MAX_LEN ---> |
| 105 | * <--- offset ---> <--- request_len -------> |
| 106 | * +----------------+-------------------------+----------+--+ |
| 107 | * | | | | | |
| 108 | * +----------------+-------------------------+----------+--+ |
| 109 | * ^ ^ |
| 110 | * / / |
| 111 | * request_buf request |
| 112 | * |
| 113 | * <-------------------- GUC_CTB_MAX_DWORDS --------------> |
| 114 | * <-------- GUC_RELAY_MSG_MAX_LEN ---> |
| 115 | * <--- offset ---> <--- response_len ---> |
| 116 | * +----------------+----------------------+-------------+--+ |
| 117 | * | | | | | |
| 118 | * +----------------+----------------------+-------------+--+ |
| 119 | * ^ ^ |
| 120 | * / / |
| 121 | * response_buf response |
| 122 | */ |
| 123 | struct relay_transaction { |
| 124 | /** |
| 125 | * @incoming: indicates whether this transaction represents an incoming |
| 126 | * request from the remote VF/PF or this transaction |
| 127 | * represents outgoing request to the remote VF/PF. |
| 128 | */ |
| 129 | bool incoming; |
| 130 | |
| 131 | /** |
| 132 | * @remote: PF/VF identifier of the origin (or target) of the relay |
| 133 | * request message. |
| 134 | */ |
| 135 | u32 remote; |
| 136 | |
| 137 | /** @rid: identifier of the VF/PF relay message. */ |
| 138 | u32 rid; |
| 139 | |
| 140 | /** |
| 141 | * @request: points to the inner VF/PF request message, copied to the |
| 142 | * #response_buf starting at #offset. |
| 143 | */ |
| 144 | u32 *request; |
| 145 | |
| 146 | /** @request_len: length of the inner VF/PF request message. */ |
| 147 | u32 request_len; |
| 148 | |
| 149 | /** |
| 150 | * @response: points to the placeholder buffer where inner VF/PF |
| 151 | * response will be located, for outgoing transaction |
| 152 | * this could be caller's buffer (if provided) otherwise |
| 153 | * it points to the #response_buf starting at #offset. |
| 154 | */ |
| 155 | u32 *response; |
| 156 | |
| 157 | /** |
| 158 | * @response_len: length of the inner VF/PF response message (only |
| 159 | * if #status is 0), initially set to the size of the |
| 160 | * placeholder buffer where response message will be |
| 161 | * copied. |
| 162 | */ |
| 163 | u32 response_len; |
| 164 | |
| 165 | /** |
| 166 | * @offset: offset to the start of the inner VF/PF relay message inside |
| 167 | * buffers; this offset is equal the length of the outer GuC |
| 168 | * relay header message. |
| 169 | */ |
| 170 | u32 offset; |
| 171 | |
| 172 | /** |
| 173 | * @request_buf: buffer with VF/PF request message including outer |
| 174 | * transport message. |
| 175 | */ |
| 176 | u32 request_buf[GUC_CTB_MAX_DWORDS]; |
| 177 | |
| 178 | /** |
| 179 | * @response_buf: buffer with VF/PF response message including outer |
| 180 | * transport message. |
| 181 | */ |
| 182 | u32 response_buf[GUC_CTB_MAX_DWORDS]; |
| 183 | |
| 184 | /** |
| 185 | * @reply: status of the reply, 0 means that data pointed by the |
| 186 | * #response is valid. |
| 187 | */ |
| 188 | int reply; |
| 189 | |
| 190 | /** @done: completion of the outgoing transaction. */ |
| 191 | struct completion done; |
| 192 | |
| 193 | /** @link: transaction list link */ |
| 194 | struct list_head link; |
| 195 | }; |
| 196 | |
| 197 | static u32 prepare_pf2guc(u32 *msg, u32 target, u32 rid) |
| 198 | { |
| 199 | msg[0] = FIELD_PREP(GUC_HXG_MSG_0_ORIGIN, GUC_HXG_ORIGIN_HOST) | |
| 200 | FIELD_PREP(GUC_HXG_MSG_0_TYPE, GUC_HXG_TYPE_REQUEST) | |
| 201 | FIELD_PREP(GUC_HXG_REQUEST_MSG_0_ACTION, XE_GUC_ACTION_PF2GUC_RELAY_TO_VF); |
| 202 | msg[1] = FIELD_PREP(PF2GUC_RELAY_TO_VF_REQUEST_MSG_1_VFID, target); |
| 203 | msg[2] = FIELD_PREP(PF2GUC_RELAY_TO_VF_REQUEST_MSG_2_RELAY_ID, rid); |
| 204 | |
| 205 | return PF2GUC_RELAY_TO_VF_REQUEST_MSG_MIN_LEN; |
| 206 | } |
| 207 | |
| 208 | static u32 prepare_vf2guc(u32 *msg, u32 rid) |
| 209 | { |
| 210 | msg[0] = FIELD_PREP(GUC_HXG_MSG_0_ORIGIN, GUC_HXG_ORIGIN_HOST) | |
| 211 | FIELD_PREP(GUC_HXG_MSG_0_TYPE, GUC_HXG_TYPE_REQUEST) | |
| 212 | FIELD_PREP(GUC_HXG_REQUEST_MSG_0_ACTION, XE_GUC_ACTION_VF2GUC_RELAY_TO_PF); |
| 213 | msg[1] = FIELD_PREP(VF2GUC_RELAY_TO_PF_REQUEST_MSG_1_RELAY_ID, rid); |
| 214 | |
| 215 | return VF2GUC_RELAY_TO_PF_REQUEST_MSG_MIN_LEN; |
| 216 | } |
| 217 | |
| 218 | static struct relay_transaction * |
| 219 | __relay_get_transaction(struct xe_guc_relay *relay, bool incoming, u32 remote, u32 rid, |
| 220 | const u32 *action, u32 action_len, u32 *resp, u32 resp_size) |
| 221 | { |
| 222 | struct relay_transaction *txn; |
| 223 | |
| 224 | relay_assert(relay, action_len >= GUC_RELAY_MSG_MIN_LEN); |
| 225 | relay_assert(relay, action_len <= GUC_RELAY_MSG_MAX_LEN); |
| 226 | relay_assert(relay, !(!!resp ^ !!resp_size)); |
| 227 | relay_assert(relay, resp_size <= GUC_RELAY_MSG_MAX_LEN); |
| 228 | relay_assert(relay, resp_size == 0 || resp_size >= GUC_RELAY_MSG_MIN_LEN); |
| 229 | |
| 230 | if (unlikely(!relay_is_ready(relay))) |
| 231 | return ERR_PTR(error: -ENODEV); |
| 232 | |
| 233 | /* |
| 234 | * For incoming requests we can't use GFP_KERNEL as those are delivered |
| 235 | * with CTB lock held which is marked as used in the reclaim path. |
| 236 | * Btw, that's one of the reason why we use mempool here! |
| 237 | */ |
| 238 | txn = mempool_alloc(&relay->pool, incoming ? GFP_ATOMIC : GFP_NOWAIT); |
| 239 | if (!txn) |
| 240 | return ERR_PTR(error: -ENOMEM); |
| 241 | |
| 242 | txn->incoming = incoming; |
| 243 | txn->remote = remote; |
| 244 | txn->rid = rid; |
| 245 | txn->offset = remote ? |
| 246 | prepare_pf2guc(msg: incoming ? txn->response_buf : txn->request_buf, target: remote, rid) : |
| 247 | prepare_vf2guc(msg: incoming ? txn->response_buf : txn->request_buf, rid); |
| 248 | |
| 249 | relay_assert(relay, txn->offset); |
| 250 | relay_assert(relay, txn->offset + GUC_RELAY_MSG_MAX_LEN <= ARRAY_SIZE(txn->request_buf)); |
| 251 | relay_assert(relay, txn->offset + GUC_RELAY_MSG_MAX_LEN <= ARRAY_SIZE(txn->response_buf)); |
| 252 | |
| 253 | txn->request = txn->request_buf + txn->offset; |
| 254 | memcpy(&txn->request_buf[txn->offset], action, sizeof(u32) * action_len); |
| 255 | txn->request_len = action_len; |
| 256 | |
| 257 | txn->response = resp ?: txn->response_buf + txn->offset; |
| 258 | txn->response_len = resp_size ?: GUC_RELAY_MSG_MAX_LEN; |
| 259 | txn->reply = -ENOMSG; |
| 260 | INIT_LIST_HEAD(list: &txn->link); |
| 261 | init_completion(x: &txn->done); |
| 262 | |
| 263 | return txn; |
| 264 | } |
| 265 | |
| 266 | static struct relay_transaction * |
| 267 | relay_new_transaction(struct xe_guc_relay *relay, u32 target, const u32 *action, u32 len, |
| 268 | u32 *resp, u32 resp_size) |
| 269 | { |
| 270 | u32 rid = relay_get_next_rid(relay); |
| 271 | |
| 272 | return __relay_get_transaction(relay, incoming: false, remote: target, rid, action, action_len: len, resp, resp_size); |
| 273 | } |
| 274 | |
| 275 | static struct relay_transaction * |
| 276 | relay_new_incoming_transaction(struct xe_guc_relay *relay, u32 origin, u32 rid, |
| 277 | const u32 *action, u32 len) |
| 278 | { |
| 279 | return __relay_get_transaction(relay, incoming: true, remote: origin, rid, action, action_len: len, NULL, resp_size: 0); |
| 280 | } |
| 281 | |
| 282 | static void relay_release_transaction(struct xe_guc_relay *relay, struct relay_transaction *txn) |
| 283 | { |
| 284 | relay_assert(relay, list_empty(&txn->link)); |
| 285 | |
| 286 | txn->offset = 0; |
| 287 | txn->response = NULL; |
| 288 | txn->reply = -ESTALE; |
| 289 | mempool_free(element: txn, pool: &relay->pool); |
| 290 | } |
| 291 | |
| 292 | static int relay_send_transaction(struct xe_guc_relay *relay, struct relay_transaction *txn) |
| 293 | { |
| 294 | u32 len = txn->incoming ? txn->response_len : txn->request_len; |
| 295 | u32 *buf = txn->incoming ? txn->response_buf : txn->request_buf; |
| 296 | u32 *msg = buf + txn->offset; |
| 297 | int ret; |
| 298 | |
| 299 | relay_assert(relay, txn->offset); |
| 300 | relay_assert(relay, txn->offset + len <= GUC_CTB_MAX_DWORDS); |
| 301 | relay_assert(relay, len >= GUC_RELAY_MSG_MIN_LEN); |
| 302 | relay_assert(relay, len <= GUC_RELAY_MSG_MAX_LEN); |
| 303 | |
| 304 | relay_debug(relay, "sending %s.%u to %u = %*ph\n" , |
| 305 | guc_hxg_type_to_string(FIELD_GET(GUC_HXG_MSG_0_TYPE, msg[0])), |
| 306 | txn->rid, txn->remote, (int)sizeof(u32) * len, msg); |
| 307 | |
| 308 | ret = xe_guc_ct_send_block(ct: relay_to_ct(relay), action: buf, len: len + txn->offset); |
| 309 | |
| 310 | if (unlikely(ret > 0)) { |
| 311 | relay_notice(relay, "Unexpected data=%d from GuC, wrong ABI?\n" , ret); |
| 312 | ret = -EPROTO; |
| 313 | } |
| 314 | if (unlikely(ret < 0)) { |
| 315 | relay_notice(relay, "Failed to send %s.%x to GuC (%pe) %*ph ...\n" , |
| 316 | guc_hxg_type_to_string(FIELD_GET(GUC_HXG_MSG_0_TYPE, buf[0])), |
| 317 | FIELD_GET(GUC_HXG_REQUEST_MSG_0_ACTION, buf[0]), |
| 318 | ERR_PTR(ret), (int)sizeof(u32) * txn->offset, buf); |
| 319 | relay_notice(relay, "Failed to send %s.%u to %u (%pe) %*ph\n" , |
| 320 | guc_hxg_type_to_string(FIELD_GET(GUC_HXG_MSG_0_TYPE, msg[0])), |
| 321 | txn->rid, txn->remote, ERR_PTR(ret), (int)sizeof(u32) * len, msg); |
| 322 | } |
| 323 | |
| 324 | return ret; |
| 325 | } |
| 326 | |
| 327 | static void __fini_relay(struct drm_device *drm, void *arg) |
| 328 | { |
| 329 | struct xe_guc_relay *relay = arg; |
| 330 | |
| 331 | mempool_exit(pool: &relay->pool); |
| 332 | } |
| 333 | |
| 334 | /** |
| 335 | * xe_guc_relay_init - Initialize a &xe_guc_relay |
| 336 | * @relay: the &xe_guc_relay to initialize |
| 337 | * |
| 338 | * Initialize remaining members of &xe_guc_relay that may depend |
| 339 | * on the SR-IOV mode. |
| 340 | * |
| 341 | * Return: 0 on success or a negative error code on failure. |
| 342 | */ |
| 343 | int xe_guc_relay_init(struct xe_guc_relay *relay) |
| 344 | { |
| 345 | const int XE_RELAY_MEMPOOL_MIN_NUM = 1; |
| 346 | struct xe_device *xe = relay_to_xe(relay); |
| 347 | int err; |
| 348 | |
| 349 | relay_assert(relay, !relay_is_ready(relay)); |
| 350 | |
| 351 | if (!IS_SRIOV(xe)) |
| 352 | return 0; |
| 353 | |
| 354 | spin_lock_init(&relay->lock); |
| 355 | INIT_WORK(&relay->worker, relays_worker_fn); |
| 356 | INIT_LIST_HEAD(list: &relay->pending_relays); |
| 357 | INIT_LIST_HEAD(list: &relay->incoming_actions); |
| 358 | ratelimit_state_init(rs: &relay->diag_ratelimit, |
| 359 | XE_RELAY_DIAG_RATELIMIT_INTERVAL, |
| 360 | XE_RELAY_DIAG_RATELIMIT_BURST); |
| 361 | |
| 362 | err = mempool_init_kmalloc_pool(&relay->pool, XE_RELAY_MEMPOOL_MIN_NUM + |
| 363 | relay_get_totalvfs(relay), |
| 364 | sizeof(struct relay_transaction)); |
| 365 | if (err) |
| 366 | return err; |
| 367 | |
| 368 | relay_debug(relay, "using mempool with %d elements\n" , relay->pool.min_nr); |
| 369 | |
| 370 | return drmm_add_action_or_reset(&xe->drm, __fini_relay, relay); |
| 371 | } |
| 372 | ALLOW_ERROR_INJECTION(xe_guc_relay_init, ERRNO); /* See xe_pci_probe() */ |
| 373 | |
| 374 | static u32 to_relay_error(int err) |
| 375 | { |
| 376 | /* XXX: assume that relay errors match errno codes */ |
| 377 | return err < 0 ? -err : GUC_RELAY_ERROR_UNDISCLOSED; |
| 378 | } |
| 379 | |
| 380 | static int from_relay_error(u32 error) |
| 381 | { |
| 382 | /* XXX: assume that relay errors match errno codes */ |
| 383 | return error ? -error : -ENODATA; |
| 384 | } |
| 385 | |
| 386 | static u32 sanitize_relay_error(u32 error) |
| 387 | { |
| 388 | /* XXX TBD if generic error codes will be allowed */ |
| 389 | if (!IS_ENABLED(CONFIG_DRM_XE_DEBUG)) |
| 390 | error = GUC_RELAY_ERROR_UNDISCLOSED; |
| 391 | return error; |
| 392 | } |
| 393 | |
| 394 | static u32 sanitize_relay_error_hint(u32 hint) |
| 395 | { |
| 396 | /* XXX TBD if generic error codes will be allowed */ |
| 397 | if (!IS_ENABLED(CONFIG_DRM_XE_DEBUG)) |
| 398 | hint = 0; |
| 399 | return hint; |
| 400 | } |
| 401 | |
| 402 | static u32 prepare_error_reply(u32 *msg, u32 error, u32 hint) |
| 403 | { |
| 404 | msg[0] = FIELD_PREP(GUC_HXG_MSG_0_ORIGIN, GUC_HXG_ORIGIN_HOST) | |
| 405 | FIELD_PREP(GUC_HXG_MSG_0_TYPE, GUC_HXG_TYPE_RESPONSE_FAILURE) | |
| 406 | FIELD_PREP(GUC_HXG_FAILURE_MSG_0_HINT, hint) | |
| 407 | FIELD_PREP(GUC_HXG_FAILURE_MSG_0_ERROR, error); |
| 408 | |
| 409 | XE_WARN_ON(!FIELD_FIT(GUC_HXG_FAILURE_MSG_0_ERROR, error)); |
| 410 | XE_WARN_ON(!FIELD_FIT(GUC_HXG_FAILURE_MSG_0_HINT, hint)); |
| 411 | |
| 412 | return GUC_HXG_FAILURE_MSG_LEN; |
| 413 | } |
| 414 | |
| 415 | static void relay_testonly_nop(struct xe_guc_relay *relay) |
| 416 | { |
| 417 | KUNIT_STATIC_STUB_REDIRECT(relay_testonly_nop, relay); |
| 418 | } |
| 419 | |
| 420 | static int relay_send_message_and_wait(struct xe_guc_relay *relay, |
| 421 | struct relay_transaction *txn, |
| 422 | u32 *buf, u32 buf_size) |
| 423 | { |
| 424 | unsigned long timeout = msecs_to_jiffies(RELAY_TIMEOUT_MSEC); |
| 425 | u32 *msg = &txn->request_buf[txn->offset]; |
| 426 | u32 len = txn->request_len; |
| 427 | u32 type, action, data0; |
| 428 | int ret; |
| 429 | long n; |
| 430 | |
| 431 | type = FIELD_GET(GUC_HXG_MSG_0_TYPE, msg[0]); |
| 432 | action = FIELD_GET(GUC_HXG_REQUEST_MSG_0_ACTION, msg[0]); |
| 433 | data0 = FIELD_GET(GUC_HXG_REQUEST_MSG_0_DATA0, msg[0]); |
| 434 | |
| 435 | relay_debug(relay, "%s.%u to %u action %#x:%u\n" , |
| 436 | guc_hxg_type_to_string(type), |
| 437 | txn->rid, txn->remote, action, data0); |
| 438 | |
| 439 | /* list ordering does not need to match RID ordering */ |
| 440 | spin_lock(lock: &relay->lock); |
| 441 | list_add_tail(new: &txn->link, head: &relay->pending_relays); |
| 442 | spin_unlock(lock: &relay->lock); |
| 443 | |
| 444 | resend: |
| 445 | ret = relay_send_transaction(relay, txn); |
| 446 | if (unlikely(ret < 0)) |
| 447 | goto unlink; |
| 448 | |
| 449 | wait: |
| 450 | n = wait_for_completion_timeout(x: &txn->done, timeout); |
| 451 | if (unlikely(n == 0 && txn->reply)) { |
| 452 | ret = -ETIME; |
| 453 | goto unlink; |
| 454 | } |
| 455 | |
| 456 | relay_debug(relay, "%u.%u reply %d after %u msec\n" , |
| 457 | txn->remote, txn->rid, txn->reply, jiffies_to_msecs(timeout - n)); |
| 458 | if (unlikely(txn->reply)) { |
| 459 | reinit_completion(x: &txn->done); |
| 460 | if (txn->reply == -EAGAIN) |
| 461 | goto resend; |
| 462 | if (txn->reply == -EBUSY) { |
| 463 | relay_testonly_nop(relay); |
| 464 | goto wait; |
| 465 | } |
| 466 | if (txn->reply > 0) |
| 467 | ret = from_relay_error(error: txn->reply); |
| 468 | else |
| 469 | ret = txn->reply; |
| 470 | goto unlink; |
| 471 | } |
| 472 | |
| 473 | relay_debug(relay, "%u.%u response %*ph\n" , txn->remote, txn->rid, |
| 474 | (int)sizeof(u32) * txn->response_len, txn->response); |
| 475 | relay_assert(relay, txn->response_len >= GUC_RELAY_MSG_MIN_LEN); |
| 476 | ret = txn->response_len; |
| 477 | |
| 478 | unlink: |
| 479 | spin_lock(lock: &relay->lock); |
| 480 | list_del_init(entry: &txn->link); |
| 481 | spin_unlock(lock: &relay->lock); |
| 482 | |
| 483 | if (unlikely(ret < 0)) { |
| 484 | relay_notice(relay, "Unsuccessful %s.%u %#x:%u to %u (%pe) %*ph\n" , |
| 485 | guc_hxg_type_to_string(type), txn->rid, |
| 486 | action, data0, txn->remote, ERR_PTR(ret), |
| 487 | (int)sizeof(u32) * len, msg); |
| 488 | } |
| 489 | |
| 490 | return ret; |
| 491 | } |
| 492 | |
| 493 | static int relay_send_to(struct xe_guc_relay *relay, u32 target, |
| 494 | const u32 *msg, u32 len, u32 *buf, u32 buf_size) |
| 495 | { |
| 496 | struct relay_transaction *txn; |
| 497 | int ret; |
| 498 | |
| 499 | relay_assert(relay, len >= GUC_RELAY_MSG_MIN_LEN); |
| 500 | relay_assert(relay, len <= GUC_RELAY_MSG_MAX_LEN); |
| 501 | relay_assert(relay, FIELD_GET(GUC_HXG_MSG_0_ORIGIN, msg[0]) == GUC_HXG_ORIGIN_HOST); |
| 502 | relay_assert(relay, guc_hxg_type_is_action(FIELD_GET(GUC_HXG_MSG_0_TYPE, msg[0]))); |
| 503 | |
| 504 | if (unlikely(!relay_is_ready(relay))) |
| 505 | return -ENODEV; |
| 506 | |
| 507 | txn = relay_new_transaction(relay, target, action: msg, len, resp: buf, resp_size: buf_size); |
| 508 | if (IS_ERR(ptr: txn)) |
| 509 | return PTR_ERR(ptr: txn); |
| 510 | |
| 511 | switch (FIELD_GET(GUC_HXG_MSG_0_TYPE, msg[0])) { |
| 512 | case GUC_HXG_TYPE_REQUEST: |
| 513 | ret = relay_send_message_and_wait(relay, txn, buf, buf_size); |
| 514 | break; |
| 515 | case GUC_HXG_TYPE_FAST_REQUEST: |
| 516 | relay_assert(relay, !GUC_HXG_TYPE_FAST_REQUEST); |
| 517 | fallthrough; |
| 518 | case GUC_HXG_TYPE_EVENT: |
| 519 | ret = relay_send_transaction(relay, txn); |
| 520 | break; |
| 521 | default: |
| 522 | ret = -EINVAL; |
| 523 | break; |
| 524 | } |
| 525 | |
| 526 | relay_release_transaction(relay, txn); |
| 527 | return ret; |
| 528 | } |
| 529 | |
| 530 | #ifdef CONFIG_PCI_IOV |
| 531 | /** |
| 532 | * xe_guc_relay_send_to_vf - Send a message to the VF. |
| 533 | * @relay: the &xe_guc_relay which will send the message |
| 534 | * @target: target VF number |
| 535 | * @msg: request message to be sent |
| 536 | * @len: length of the request message (in dwords, can't be 0) |
| 537 | * @buf: placeholder for the response message |
| 538 | * @buf_size: size of the response message placeholder (in dwords) |
| 539 | * |
| 540 | * This function can only be used by the driver running in the SR-IOV PF mode. |
| 541 | * |
| 542 | * Return: Non-negative response length (in dwords) or |
| 543 | * a negative error code on failure. |
| 544 | */ |
| 545 | int xe_guc_relay_send_to_vf(struct xe_guc_relay *relay, u32 target, |
| 546 | const u32 *msg, u32 len, u32 *buf, u32 buf_size) |
| 547 | { |
| 548 | relay_assert(relay, IS_SRIOV_PF(relay_to_xe(relay))); |
| 549 | |
| 550 | return relay_send_to(relay, target, msg, len, buf, buf_size); |
| 551 | } |
| 552 | #endif |
| 553 | |
| 554 | /** |
| 555 | * xe_guc_relay_send_to_pf - Send a message to the PF. |
| 556 | * @relay: the &xe_guc_relay which will send the message |
| 557 | * @msg: request message to be sent |
| 558 | * @len: length of the message (in dwords, can't be 0) |
| 559 | * @buf: placeholder for the response message |
| 560 | * @buf_size: size of the response message placeholder (in dwords) |
| 561 | * |
| 562 | * This function can only be used by driver running in SR-IOV VF mode. |
| 563 | * |
| 564 | * Return: Non-negative response length (in dwords) or |
| 565 | * a negative error code on failure. |
| 566 | */ |
| 567 | int xe_guc_relay_send_to_pf(struct xe_guc_relay *relay, |
| 568 | const u32 *msg, u32 len, u32 *buf, u32 buf_size) |
| 569 | { |
| 570 | relay_assert(relay, IS_SRIOV_VF(relay_to_xe(relay))); |
| 571 | |
| 572 | return relay_send_to(relay, PFID, msg, len, buf, buf_size); |
| 573 | } |
| 574 | |
| 575 | static int relay_handle_reply(struct xe_guc_relay *relay, u32 origin, |
| 576 | u32 rid, int reply, const u32 *msg, u32 len) |
| 577 | { |
| 578 | struct relay_transaction *pending; |
| 579 | int err = -ESRCH; |
| 580 | |
| 581 | spin_lock(lock: &relay->lock); |
| 582 | list_for_each_entry(pending, &relay->pending_relays, link) { |
| 583 | if (pending->remote != origin || pending->rid != rid) { |
| 584 | relay_debug(relay, "%u.%u still awaits response\n" , |
| 585 | pending->remote, pending->rid); |
| 586 | continue; |
| 587 | } |
| 588 | err = 0; /* found! */ |
| 589 | if (reply == 0) { |
| 590 | if (len > pending->response_len) { |
| 591 | reply = -ENOBUFS; |
| 592 | err = -ENOBUFS; |
| 593 | } else { |
| 594 | memcpy(pending->response, msg, 4 * len); |
| 595 | pending->response_len = len; |
| 596 | } |
| 597 | } |
| 598 | pending->reply = reply; |
| 599 | complete_all(&pending->done); |
| 600 | break; |
| 601 | } |
| 602 | spin_unlock(lock: &relay->lock); |
| 603 | |
| 604 | return err; |
| 605 | } |
| 606 | |
| 607 | static int relay_handle_failure(struct xe_guc_relay *relay, u32 origin, |
| 608 | u32 rid, const u32 *msg, u32 len) |
| 609 | { |
| 610 | int error = FIELD_GET(GUC_HXG_FAILURE_MSG_0_ERROR, msg[0]); |
| 611 | u32 hint __maybe_unused = FIELD_GET(GUC_HXG_FAILURE_MSG_0_HINT, msg[0]); |
| 612 | |
| 613 | relay_assert(relay, len); |
| 614 | relay_debug(relay, "%u.%u error %#x (%pe) hint %u debug %*ph\n" , |
| 615 | origin, rid, error, ERR_PTR(-error), hint, 4 * (len - 1), msg + 1); |
| 616 | |
| 617 | return relay_handle_reply(relay, origin, rid, reply: error ?: -EREMOTEIO, NULL, len: 0); |
| 618 | } |
| 619 | |
| 620 | static int relay_testloop_action_handler(struct xe_guc_relay *relay, u32 origin, |
| 621 | const u32 *msg, u32 len, u32 *response, u32 size) |
| 622 | { |
| 623 | static ktime_t last_reply = 0; |
| 624 | u32 type = FIELD_GET(GUC_HXG_MSG_0_TYPE, msg[0]); |
| 625 | u32 action = FIELD_GET(GUC_HXG_REQUEST_MSG_0_ACTION, msg[0]); |
| 626 | u32 opcode = FIELD_GET(GUC_HXG_REQUEST_MSG_0_DATA0, msg[0]); |
| 627 | ktime_t now = ktime_get(); |
| 628 | bool busy; |
| 629 | int ret; |
| 630 | |
| 631 | relay_assert(relay, guc_hxg_type_is_action(type)); |
| 632 | relay_assert(relay, action == GUC_RELAY_ACTION_VFXPF_TESTLOOP); |
| 633 | |
| 634 | if (!IS_ENABLED(CONFIG_DRM_XE_DEBUG_SRIOV)) |
| 635 | return -ECONNREFUSED; |
| 636 | |
| 637 | if (!last_reply) |
| 638 | last_reply = now; |
| 639 | busy = ktime_before(cmp1: now, cmp2: ktime_add_ms(kt: last_reply, msec: 2 * RELAY_TIMEOUT_MSEC)); |
| 640 | if (!busy) |
| 641 | last_reply = now; |
| 642 | |
| 643 | switch (opcode) { |
| 644 | case VFXPF_TESTLOOP_OPCODE_NOP: |
| 645 | if (type == GUC_HXG_TYPE_EVENT) |
| 646 | return 0; |
| 647 | return guc_hxg_msg_encode_success(msg: response, data0: 0); |
| 648 | case VFXPF_TESTLOOP_OPCODE_BUSY: |
| 649 | if (type == GUC_HXG_TYPE_EVENT) |
| 650 | return -EPROTO; |
| 651 | msleep(RELAY_TIMEOUT_MSEC / 8); |
| 652 | if (busy) |
| 653 | return -EINPROGRESS; |
| 654 | return guc_hxg_msg_encode_success(msg: response, data0: 0); |
| 655 | case VFXPF_TESTLOOP_OPCODE_RETRY: |
| 656 | if (type == GUC_HXG_TYPE_EVENT) |
| 657 | return -EPROTO; |
| 658 | msleep(RELAY_TIMEOUT_MSEC / 8); |
| 659 | if (busy) |
| 660 | return guc_hxg_msg_encode_retry(msg: response, reason: 0); |
| 661 | return guc_hxg_msg_encode_success(msg: response, data0: 0); |
| 662 | case VFXPF_TESTLOOP_OPCODE_ECHO: |
| 663 | if (type == GUC_HXG_TYPE_EVENT) |
| 664 | return -EPROTO; |
| 665 | if (size < len) |
| 666 | return -ENOBUFS; |
| 667 | ret = guc_hxg_msg_encode_success(msg: response, data0: len); |
| 668 | memcpy(response + ret, msg + ret, (len - ret) * sizeof(u32)); |
| 669 | return len; |
| 670 | case VFXPF_TESTLOOP_OPCODE_FAIL: |
| 671 | return -EHWPOISON; |
| 672 | default: |
| 673 | break; |
| 674 | } |
| 675 | |
| 676 | relay_notice(relay, "Unexpected action %#x opcode %#x\n" , action, opcode); |
| 677 | return -EBADRQC; |
| 678 | } |
| 679 | |
| 680 | static int relay_action_handler(struct xe_guc_relay *relay, u32 origin, |
| 681 | const u32 *msg, u32 len, u32 *response, u32 size) |
| 682 | { |
| 683 | struct xe_gt *gt = relay_to_gt(relay); |
| 684 | u32 type; |
| 685 | int ret; |
| 686 | |
| 687 | relay_assert(relay, len >= GUC_HXG_MSG_MIN_LEN); |
| 688 | |
| 689 | if (FIELD_GET(GUC_HXG_REQUEST_MSG_0_ACTION, msg[0]) == GUC_RELAY_ACTION_VFXPF_TESTLOOP) |
| 690 | return relay_testloop_action_handler(relay, origin, msg, len, response, size); |
| 691 | |
| 692 | type = FIELD_GET(GUC_HXG_MSG_0_TYPE, msg[0]); |
| 693 | |
| 694 | if (IS_SRIOV_PF(relay_to_xe(relay))) |
| 695 | ret = xe_gt_sriov_pf_service_process_request(gt, origin, msg, msg_len: len, response, resp_size: size); |
| 696 | else |
| 697 | ret = -EOPNOTSUPP; |
| 698 | |
| 699 | if (type == GUC_HXG_TYPE_EVENT) |
| 700 | relay_assert(relay, ret <= 0); |
| 701 | |
| 702 | return ret; |
| 703 | } |
| 704 | |
| 705 | static struct relay_transaction *relay_dequeue_transaction(struct xe_guc_relay *relay) |
| 706 | { |
| 707 | struct relay_transaction *txn; |
| 708 | |
| 709 | spin_lock(lock: &relay->lock); |
| 710 | txn = list_first_entry_or_null(&relay->incoming_actions, struct relay_transaction, link); |
| 711 | if (txn) |
| 712 | list_del_init(entry: &txn->link); |
| 713 | spin_unlock(lock: &relay->lock); |
| 714 | |
| 715 | return txn; |
| 716 | } |
| 717 | |
| 718 | static void relay_process_incoming_action(struct xe_guc_relay *relay) |
| 719 | { |
| 720 | struct relay_transaction *txn; |
| 721 | bool again = false; |
| 722 | u32 type; |
| 723 | int ret; |
| 724 | |
| 725 | txn = relay_dequeue_transaction(relay); |
| 726 | if (!txn) |
| 727 | return; |
| 728 | |
| 729 | type = FIELD_GET(GUC_HXG_MSG_0_TYPE, txn->request_buf[txn->offset]); |
| 730 | |
| 731 | ret = relay_action_handler(relay, origin: txn->remote, |
| 732 | msg: txn->request_buf + txn->offset, len: txn->request_len, |
| 733 | response: txn->response_buf + txn->offset, |
| 734 | ARRAY_SIZE(txn->response_buf) - txn->offset); |
| 735 | |
| 736 | if (ret == -EINPROGRESS) { |
| 737 | again = true; |
| 738 | ret = guc_hxg_msg_encode_busy(msg: txn->response_buf + txn->offset, counter: 0); |
| 739 | } |
| 740 | |
| 741 | if (ret > 0) { |
| 742 | txn->response_len = ret; |
| 743 | ret = relay_send_transaction(relay, txn); |
| 744 | } |
| 745 | |
| 746 | if (ret < 0) { |
| 747 | u32 error = to_relay_error(err: ret); |
| 748 | |
| 749 | relay_notice(relay, "Failed to handle %s.%u from %u (%pe) %*ph\n" , |
| 750 | guc_hxg_type_to_string(type), txn->rid, txn->remote, |
| 751 | ERR_PTR(ret), 4 * txn->request_len, txn->request_buf + txn->offset); |
| 752 | |
| 753 | txn->response_len = prepare_error_reply(msg: txn->response_buf + txn->offset, |
| 754 | error: txn->remote ? |
| 755 | sanitize_relay_error(error) : error, |
| 756 | hint: txn->remote ? |
| 757 | sanitize_relay_error_hint(hint: -ret) : -ret); |
| 758 | ret = relay_send_transaction(relay, txn); |
| 759 | again = false; |
| 760 | } |
| 761 | |
| 762 | if (again) { |
| 763 | spin_lock(lock: &relay->lock); |
| 764 | list_add(new: &txn->link, head: &relay->incoming_actions); |
| 765 | spin_unlock(lock: &relay->lock); |
| 766 | return; |
| 767 | } |
| 768 | |
| 769 | if (unlikely(ret < 0)) |
| 770 | relay_notice(relay, "Failed to process action.%u (%pe) %*ph\n" , |
| 771 | txn->rid, ERR_PTR(ret), 4 * txn->request_len, |
| 772 | txn->request_buf + txn->offset); |
| 773 | |
| 774 | relay_release_transaction(relay, txn); |
| 775 | } |
| 776 | |
| 777 | static bool relay_needs_worker(struct xe_guc_relay *relay) |
| 778 | { |
| 779 | bool is_empty; |
| 780 | |
| 781 | spin_lock(lock: &relay->lock); |
| 782 | is_empty = list_empty(head: &relay->incoming_actions); |
| 783 | spin_unlock(lock: &relay->lock); |
| 784 | |
| 785 | return !is_empty; |
| 786 | |
| 787 | } |
| 788 | |
| 789 | static void relay_kick_worker(struct xe_guc_relay *relay) |
| 790 | { |
| 791 | KUNIT_STATIC_STUB_REDIRECT(relay_kick_worker, relay); |
| 792 | queue_work(wq: relay_to_xe(relay)->sriov.wq, work: &relay->worker); |
| 793 | } |
| 794 | |
| 795 | static void relays_worker_fn(struct work_struct *w) |
| 796 | { |
| 797 | struct xe_guc_relay *relay = container_of(w, struct xe_guc_relay, worker); |
| 798 | |
| 799 | relay_process_incoming_action(relay); |
| 800 | |
| 801 | if (relay_needs_worker(relay)) |
| 802 | relay_kick_worker(relay); |
| 803 | } |
| 804 | |
| 805 | static int relay_queue_action_msg(struct xe_guc_relay *relay, u32 origin, u32 rid, |
| 806 | const u32 *msg, u32 len) |
| 807 | { |
| 808 | struct relay_transaction *txn; |
| 809 | |
| 810 | txn = relay_new_incoming_transaction(relay, origin, rid, action: msg, len); |
| 811 | if (IS_ERR(ptr: txn)) |
| 812 | return PTR_ERR(ptr: txn); |
| 813 | |
| 814 | spin_lock(lock: &relay->lock); |
| 815 | list_add_tail(new: &txn->link, head: &relay->incoming_actions); |
| 816 | spin_unlock(lock: &relay->lock); |
| 817 | |
| 818 | relay_kick_worker(relay); |
| 819 | return 0; |
| 820 | } |
| 821 | |
| 822 | static int relay_process_msg(struct xe_guc_relay *relay, u32 origin, u32 rid, |
| 823 | const u32 *msg, u32 len) |
| 824 | { |
| 825 | u32 type; |
| 826 | int err; |
| 827 | |
| 828 | if (unlikely(len < GUC_HXG_MSG_MIN_LEN)) |
| 829 | return -EPROTO; |
| 830 | |
| 831 | if (FIELD_GET(GUC_HXG_MSG_0_ORIGIN, msg[0]) != GUC_HXG_ORIGIN_HOST) |
| 832 | return -EPROTO; |
| 833 | |
| 834 | type = FIELD_GET(GUC_HXG_MSG_0_TYPE, msg[0]); |
| 835 | relay_debug(relay, "received %s.%u from %u = %*ph\n" , |
| 836 | guc_hxg_type_to_string(type), rid, origin, 4 * len, msg); |
| 837 | |
| 838 | switch (type) { |
| 839 | case GUC_HXG_TYPE_REQUEST: |
| 840 | case GUC_HXG_TYPE_FAST_REQUEST: |
| 841 | case GUC_HXG_TYPE_EVENT: |
| 842 | err = relay_queue_action_msg(relay, origin, rid, msg, len); |
| 843 | break; |
| 844 | case GUC_HXG_TYPE_RESPONSE_SUCCESS: |
| 845 | err = relay_handle_reply(relay, origin, rid, reply: 0, msg, len); |
| 846 | break; |
| 847 | case GUC_HXG_TYPE_NO_RESPONSE_BUSY: |
| 848 | err = relay_handle_reply(relay, origin, rid, reply: -EBUSY, NULL, len: 0); |
| 849 | break; |
| 850 | case GUC_HXG_TYPE_NO_RESPONSE_RETRY: |
| 851 | err = relay_handle_reply(relay, origin, rid, reply: -EAGAIN, NULL, len: 0); |
| 852 | break; |
| 853 | case GUC_HXG_TYPE_RESPONSE_FAILURE: |
| 854 | err = relay_handle_failure(relay, origin, rid, msg, len); |
| 855 | break; |
| 856 | default: |
| 857 | err = -EBADRQC; |
| 858 | } |
| 859 | |
| 860 | if (unlikely(err)) |
| 861 | relay_notice(relay, "Failed to process %s.%u from %u (%pe) %*ph\n" , |
| 862 | guc_hxg_type_to_string(type), rid, origin, |
| 863 | ERR_PTR(err), 4 * len, msg); |
| 864 | |
| 865 | return err; |
| 866 | } |
| 867 | |
| 868 | /** |
| 869 | * xe_guc_relay_process_guc2vf - Handle relay notification message from the GuC. |
| 870 | * @relay: the &xe_guc_relay which will handle the message |
| 871 | * @msg: message to be handled |
| 872 | * @len: length of the message (in dwords) |
| 873 | * |
| 874 | * This function will handle relay messages received from the GuC. |
| 875 | * |
| 876 | * This function is can only be used if driver is running in SR-IOV mode. |
| 877 | * |
| 878 | * Return: 0 on success or a negative error code on failure. |
| 879 | */ |
| 880 | int xe_guc_relay_process_guc2vf(struct xe_guc_relay *relay, const u32 *msg, u32 len) |
| 881 | { |
| 882 | u32 rid; |
| 883 | |
| 884 | relay_assert(relay, len >= GUC_HXG_MSG_MIN_LEN); |
| 885 | relay_assert(relay, FIELD_GET(GUC_HXG_MSG_0_ORIGIN, msg[0]) == GUC_HXG_ORIGIN_GUC); |
| 886 | relay_assert(relay, FIELD_GET(GUC_HXG_MSG_0_TYPE, msg[0]) == GUC_HXG_TYPE_EVENT); |
| 887 | relay_assert(relay, FIELD_GET(GUC_HXG_EVENT_MSG_0_ACTION, msg[0]) == |
| 888 | XE_GUC_ACTION_GUC2VF_RELAY_FROM_PF); |
| 889 | |
| 890 | if (unlikely(!IS_SRIOV_VF(relay_to_xe(relay)) && !kunit_get_current_test())) |
| 891 | return -EPERM; |
| 892 | |
| 893 | if (unlikely(!relay_is_ready(relay))) |
| 894 | return -ENODEV; |
| 895 | |
| 896 | if (unlikely(len < GUC2VF_RELAY_FROM_PF_EVENT_MSG_MIN_LEN)) |
| 897 | return -EPROTO; |
| 898 | |
| 899 | if (unlikely(len > GUC2VF_RELAY_FROM_PF_EVENT_MSG_MAX_LEN)) |
| 900 | return -EMSGSIZE; |
| 901 | |
| 902 | if (unlikely(FIELD_GET(GUC_HXG_EVENT_MSG_0_DATA0, msg[0]))) |
| 903 | return -EPFNOSUPPORT; |
| 904 | |
| 905 | rid = FIELD_GET(GUC2VF_RELAY_FROM_PF_EVENT_MSG_1_RELAY_ID, msg[1]); |
| 906 | |
| 907 | return relay_process_msg(relay, PFID, rid, |
| 908 | msg: msg + GUC2VF_RELAY_FROM_PF_EVENT_MSG_MIN_LEN, |
| 909 | len: len - GUC2VF_RELAY_FROM_PF_EVENT_MSG_MIN_LEN); |
| 910 | } |
| 911 | |
| 912 | #ifdef CONFIG_PCI_IOV |
| 913 | /** |
| 914 | * xe_guc_relay_process_guc2pf - Handle relay notification message from the GuC. |
| 915 | * @relay: the &xe_guc_relay which will handle the message |
| 916 | * @msg: message to be handled |
| 917 | * @len: length of the message (in dwords) |
| 918 | * |
| 919 | * This function will handle relay messages received from the GuC. |
| 920 | * |
| 921 | * This function can only be used if driver is running in SR-IOV PF mode. |
| 922 | * |
| 923 | * Return: 0 on success or a negative error code on failure. |
| 924 | */ |
| 925 | int xe_guc_relay_process_guc2pf(struct xe_guc_relay *relay, const u32 *msg, u32 len) |
| 926 | { |
| 927 | u32 origin, rid; |
| 928 | int err; |
| 929 | |
| 930 | relay_assert(relay, len >= GUC_HXG_EVENT_MSG_MIN_LEN); |
| 931 | relay_assert(relay, FIELD_GET(GUC_HXG_MSG_0_ORIGIN, msg[0]) == GUC_HXG_ORIGIN_GUC); |
| 932 | relay_assert(relay, FIELD_GET(GUC_HXG_MSG_0_TYPE, msg[0]) == GUC_HXG_TYPE_EVENT); |
| 933 | relay_assert(relay, FIELD_GET(GUC_HXG_EVENT_MSG_0_ACTION, msg[0]) == |
| 934 | XE_GUC_ACTION_GUC2PF_RELAY_FROM_VF); |
| 935 | |
| 936 | if (unlikely(!IS_SRIOV_PF(relay_to_xe(relay)) && !kunit_get_current_test())) |
| 937 | return -EPERM; |
| 938 | |
| 939 | if (unlikely(!relay_is_ready(relay))) |
| 940 | return -ENODEV; |
| 941 | |
| 942 | if (unlikely(len < GUC2PF_RELAY_FROM_VF_EVENT_MSG_MIN_LEN)) |
| 943 | return -EPROTO; |
| 944 | |
| 945 | if (unlikely(len > GUC2PF_RELAY_FROM_VF_EVENT_MSG_MAX_LEN)) |
| 946 | return -EMSGSIZE; |
| 947 | |
| 948 | if (unlikely(FIELD_GET(GUC_HXG_EVENT_MSG_0_DATA0, msg[0]))) |
| 949 | return -EPFNOSUPPORT; |
| 950 | |
| 951 | origin = FIELD_GET(GUC2PF_RELAY_FROM_VF_EVENT_MSG_1_VFID, msg[1]); |
| 952 | rid = FIELD_GET(GUC2PF_RELAY_FROM_VF_EVENT_MSG_2_RELAY_ID, msg[2]); |
| 953 | |
| 954 | if (unlikely(origin > relay_get_totalvfs(relay))) |
| 955 | return -ENOENT; |
| 956 | |
| 957 | err = relay_process_msg(relay, origin, rid, |
| 958 | msg: msg + GUC2PF_RELAY_FROM_VF_EVENT_MSG_MIN_LEN, |
| 959 | len: len - GUC2PF_RELAY_FROM_VF_EVENT_MSG_MIN_LEN); |
| 960 | |
| 961 | return err; |
| 962 | } |
| 963 | #endif |
| 964 | |
| 965 | #if IS_BUILTIN(CONFIG_DRM_XE_KUNIT_TEST) |
| 966 | #include "tests/xe_guc_relay_test.c" |
| 967 | #endif |
| 968 | |