Alex Dai | bac427f | 2015-08-12 15:43:39 +0100 | [diff] [blame] | 1 | /* |
| 2 | * Copyright © 2014 Intel Corporation |
| 3 | * |
| 4 | * Permission is hereby granted, free of charge, to any person obtaining a |
| 5 | * copy of this software and associated documentation files (the "Software"), |
| 6 | * to deal in the Software without restriction, including without limitation |
| 7 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
| 8 | * and/or sell copies of the Software, and to permit persons to whom the |
| 9 | * Software is furnished to do so, subject to the following conditions: |
| 10 | * |
| 11 | * The above copyright notice and this permission notice (including the next |
| 12 | * paragraph) shall be included in all copies or substantial portions of the |
| 13 | * Software. |
| 14 | * |
| 15 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| 16 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 17 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| 18 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| 19 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING |
| 20 | * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS |
| 21 | * IN THE SOFTWARE. |
| 22 | * |
| 23 | */ |
| 24 | #include <linux/firmware.h> |
| 25 | #include <linux/circ_buf.h> |
| 26 | #include "i915_drv.h" |
| 27 | #include "intel_guc.h" |
| 28 | |
| 29 | /** |
Dave Gordon | 44a28b1 | 2015-08-12 15:43:41 +0100 | [diff] [blame^] | 30 | * DOC: GuC Client |
| 31 | * |
| 32 | * i915_guc_client: |
| 33 | * We use the term client to avoid confusion with contexts. A i915_guc_client is |
| 34 | * equivalent to GuC object guc_context_desc. This context descriptor is |
| 35 | * allocated from a pool of 1024 entries. Kernel driver will allocate doorbell |
| 36 | * and workqueue for it. Also the process descriptor (guc_process_desc), which |
| 37 | * is mapped to client space. So the client can write Work Item then ring the |
| 38 | * doorbell. |
| 39 | * |
| 40 | * To simplify the implementation, we allocate one gem object that contains all |
| 41 | * pages for doorbell, process descriptor and workqueue. |
| 42 | * |
| 43 | * The Scratch registers: |
| 44 | * There are 16 MMIO-based registers start from 0xC180. The kernel driver writes |
| 45 | * a value to the action register (SOFT_SCRATCH_0) along with any data. It then |
| 46 | * triggers an interrupt on the GuC via another register write (0xC4C8). |
| 47 | * Firmware writes a success/fail code back to the action register after |
| 48 | * processes the request. The kernel driver polls waiting for this update and |
| 49 | * then proceeds. |
| 50 | * See host2guc_action() |
| 51 | * |
| 52 | * Doorbells: |
| 53 | * Doorbells are interrupts to uKernel. A doorbell is a single cache line (QW) |
| 54 | * mapped into process space. |
| 55 | * |
| 56 | * Work Items: |
| 57 | * There are several types of work items that the host may place into a |
| 58 | * workqueue, each with its own requirements and limitations. Currently only |
| 59 | * WQ_TYPE_INORDER is needed to support legacy submission via GuC, which |
| 60 | * represents in-order queue. The kernel driver packs ring tail pointer and an |
| 61 | * ELSP context descriptor dword into Work Item. |
| 62 | * See guc_add_workqueue_item() |
| 63 | * |
| 64 | */ |
| 65 | |
| 66 | /* |
| 67 | * Read GuC command/status register (SOFT_SCRATCH_0) |
| 68 | * Return true if it contains a response rather than a command |
| 69 | */ |
| 70 | static inline bool host2guc_action_response(struct drm_i915_private *dev_priv, |
| 71 | u32 *status) |
| 72 | { |
| 73 | u32 val = I915_READ(SOFT_SCRATCH(0)); |
| 74 | *status = val; |
| 75 | return GUC2HOST_IS_RESPONSE(val); |
| 76 | } |
| 77 | |
| 78 | static int host2guc_action(struct intel_guc *guc, u32 *data, u32 len) |
| 79 | { |
| 80 | struct drm_i915_private *dev_priv = guc_to_i915(guc); |
| 81 | u32 status; |
| 82 | int i; |
| 83 | int ret; |
| 84 | |
| 85 | if (WARN_ON(len < 1 || len > 15)) |
| 86 | return -EINVAL; |
| 87 | |
| 88 | intel_uncore_forcewake_get(dev_priv, FORCEWAKE_ALL); |
| 89 | spin_lock(&dev_priv->guc.host2guc_lock); |
| 90 | |
| 91 | dev_priv->guc.action_count += 1; |
| 92 | dev_priv->guc.action_cmd = data[0]; |
| 93 | |
| 94 | for (i = 0; i < len; i++) |
| 95 | I915_WRITE(SOFT_SCRATCH(i), data[i]); |
| 96 | |
| 97 | POSTING_READ(SOFT_SCRATCH(i - 1)); |
| 98 | |
| 99 | I915_WRITE(HOST2GUC_INTERRUPT, HOST2GUC_TRIGGER); |
| 100 | |
| 101 | /* No HOST2GUC command should take longer than 10ms */ |
| 102 | ret = wait_for_atomic(host2guc_action_response(dev_priv, &status), 10); |
| 103 | if (status != GUC2HOST_STATUS_SUCCESS) { |
| 104 | /* |
| 105 | * Either the GuC explicitly returned an error (which |
| 106 | * we convert to -EIO here) or no response at all was |
| 107 | * received within the timeout limit (-ETIMEDOUT) |
| 108 | */ |
| 109 | if (ret != -ETIMEDOUT) |
| 110 | ret = -EIO; |
| 111 | |
| 112 | DRM_ERROR("GUC: host2guc action 0x%X failed. ret=%d " |
| 113 | "status=0x%08X response=0x%08X\n", |
| 114 | data[0], ret, status, |
| 115 | I915_READ(SOFT_SCRATCH(15))); |
| 116 | |
| 117 | dev_priv->guc.action_fail += 1; |
| 118 | dev_priv->guc.action_err = ret; |
| 119 | } |
| 120 | dev_priv->guc.action_status = status; |
| 121 | |
| 122 | spin_unlock(&dev_priv->guc.host2guc_lock); |
| 123 | intel_uncore_forcewake_put(dev_priv, FORCEWAKE_ALL); |
| 124 | |
| 125 | return ret; |
| 126 | } |
| 127 | |
| 128 | /* |
| 129 | * Tell the GuC to allocate or deallocate a specific doorbell |
| 130 | */ |
| 131 | |
| 132 | static int host2guc_allocate_doorbell(struct intel_guc *guc, |
| 133 | struct i915_guc_client *client) |
| 134 | { |
| 135 | u32 data[2]; |
| 136 | |
| 137 | data[0] = HOST2GUC_ACTION_ALLOCATE_DOORBELL; |
| 138 | data[1] = client->ctx_index; |
| 139 | |
| 140 | return host2guc_action(guc, data, 2); |
| 141 | } |
| 142 | |
| 143 | static int host2guc_release_doorbell(struct intel_guc *guc, |
| 144 | struct i915_guc_client *client) |
| 145 | { |
| 146 | u32 data[2]; |
| 147 | |
| 148 | data[0] = HOST2GUC_ACTION_DEALLOCATE_DOORBELL; |
| 149 | data[1] = client->ctx_index; |
| 150 | |
| 151 | return host2guc_action(guc, data, 2); |
| 152 | } |
| 153 | |
| 154 | /* |
| 155 | * Initialise, update, or clear doorbell data shared with the GuC |
| 156 | * |
| 157 | * These functions modify shared data and so need access to the mapped |
| 158 | * client object which contains the page being used for the doorbell |
| 159 | */ |
| 160 | |
| 161 | static void guc_init_doorbell(struct intel_guc *guc, |
| 162 | struct i915_guc_client *client) |
| 163 | { |
| 164 | struct guc_doorbell_info *doorbell; |
| 165 | void *base; |
| 166 | |
| 167 | base = kmap_atomic(i915_gem_object_get_page(client->client_obj, 0)); |
| 168 | doorbell = base + client->doorbell_offset; |
| 169 | |
| 170 | doorbell->db_status = 1; |
| 171 | doorbell->cookie = 0; |
| 172 | |
| 173 | kunmap_atomic(base); |
| 174 | } |
| 175 | |
| 176 | static int guc_ring_doorbell(struct i915_guc_client *gc) |
| 177 | { |
| 178 | struct guc_process_desc *desc; |
| 179 | union guc_doorbell_qw db_cmp, db_exc, db_ret; |
| 180 | union guc_doorbell_qw *db; |
| 181 | void *base; |
| 182 | int attempt = 2, ret = -EAGAIN; |
| 183 | |
| 184 | base = kmap_atomic(i915_gem_object_get_page(gc->client_obj, 0)); |
| 185 | desc = base + gc->proc_desc_offset; |
| 186 | |
| 187 | /* Update the tail so it is visible to GuC */ |
| 188 | desc->tail = gc->wq_tail; |
| 189 | |
| 190 | /* current cookie */ |
| 191 | db_cmp.db_status = GUC_DOORBELL_ENABLED; |
| 192 | db_cmp.cookie = gc->cookie; |
| 193 | |
| 194 | /* cookie to be updated */ |
| 195 | db_exc.db_status = GUC_DOORBELL_ENABLED; |
| 196 | db_exc.cookie = gc->cookie + 1; |
| 197 | if (db_exc.cookie == 0) |
| 198 | db_exc.cookie = 1; |
| 199 | |
| 200 | /* pointer of current doorbell cacheline */ |
| 201 | db = base + gc->doorbell_offset; |
| 202 | |
| 203 | while (attempt--) { |
| 204 | /* lets ring the doorbell */ |
| 205 | db_ret.value_qw = atomic64_cmpxchg((atomic64_t *)db, |
| 206 | db_cmp.value_qw, db_exc.value_qw); |
| 207 | |
| 208 | /* if the exchange was successfully executed */ |
| 209 | if (db_ret.value_qw == db_cmp.value_qw) { |
| 210 | /* db was successfully rung */ |
| 211 | gc->cookie = db_exc.cookie; |
| 212 | ret = 0; |
| 213 | break; |
| 214 | } |
| 215 | |
| 216 | /* XXX: doorbell was lost and need to acquire it again */ |
| 217 | if (db_ret.db_status == GUC_DOORBELL_DISABLED) |
| 218 | break; |
| 219 | |
| 220 | DRM_ERROR("Cookie mismatch. Expected %d, returned %d\n", |
| 221 | db_cmp.cookie, db_ret.cookie); |
| 222 | |
| 223 | /* update the cookie to newly read cookie from GuC */ |
| 224 | db_cmp.cookie = db_ret.cookie; |
| 225 | db_exc.cookie = db_ret.cookie + 1; |
| 226 | if (db_exc.cookie == 0) |
| 227 | db_exc.cookie = 1; |
| 228 | } |
| 229 | |
| 230 | kunmap_atomic(base); |
| 231 | return ret; |
| 232 | } |
| 233 | |
| 234 | static void guc_disable_doorbell(struct intel_guc *guc, |
| 235 | struct i915_guc_client *client) |
| 236 | { |
| 237 | struct drm_i915_private *dev_priv = guc_to_i915(guc); |
| 238 | struct guc_doorbell_info *doorbell; |
| 239 | void *base; |
| 240 | int drbreg = GEN8_DRBREGL(client->doorbell_id); |
| 241 | int value; |
| 242 | |
| 243 | base = kmap_atomic(i915_gem_object_get_page(client->client_obj, 0)); |
| 244 | doorbell = base + client->doorbell_offset; |
| 245 | |
| 246 | doorbell->db_status = 0; |
| 247 | |
| 248 | kunmap_atomic(base); |
| 249 | |
| 250 | I915_WRITE(drbreg, I915_READ(drbreg) & ~GEN8_DRB_VALID); |
| 251 | |
| 252 | value = I915_READ(drbreg); |
| 253 | WARN_ON((value & GEN8_DRB_VALID) != 0); |
| 254 | |
| 255 | I915_WRITE(GEN8_DRBREGU(client->doorbell_id), 0); |
| 256 | I915_WRITE(drbreg, 0); |
| 257 | |
| 258 | /* XXX: wait for any interrupts */ |
| 259 | /* XXX: wait for workqueue to drain */ |
| 260 | } |
| 261 | |
| 262 | /* |
| 263 | * Select, assign and relase doorbell cachelines |
| 264 | * |
| 265 | * These functions track which doorbell cachelines are in use. |
| 266 | * The data they manipulate is protected by the host2guc lock. |
| 267 | */ |
| 268 | |
| 269 | static uint32_t select_doorbell_cacheline(struct intel_guc *guc) |
| 270 | { |
| 271 | const uint32_t cacheline_size = cache_line_size(); |
| 272 | uint32_t offset; |
| 273 | |
| 274 | spin_lock(&guc->host2guc_lock); |
| 275 | |
| 276 | /* Doorbell uses a single cache line within a page */ |
| 277 | offset = offset_in_page(guc->db_cacheline); |
| 278 | |
| 279 | /* Moving to next cache line to reduce contention */ |
| 280 | guc->db_cacheline += cacheline_size; |
| 281 | |
| 282 | spin_unlock(&guc->host2guc_lock); |
| 283 | |
| 284 | DRM_DEBUG_DRIVER("selected doorbell cacheline 0x%x, next 0x%x, linesize %u\n", |
| 285 | offset, guc->db_cacheline, cacheline_size); |
| 286 | |
| 287 | return offset; |
| 288 | } |
| 289 | |
| 290 | static uint16_t assign_doorbell(struct intel_guc *guc, uint32_t priority) |
| 291 | { |
| 292 | /* |
| 293 | * The bitmap is split into two halves; the first half is used for |
| 294 | * normal priority contexts, the second half for high-priority ones. |
| 295 | * Note that logically higher priorities are numerically less than |
| 296 | * normal ones, so the test below means "is it high-priority?" |
| 297 | */ |
| 298 | const bool hi_pri = (priority <= GUC_CTX_PRIORITY_HIGH); |
| 299 | const uint16_t half = GUC_MAX_DOORBELLS / 2; |
| 300 | const uint16_t start = hi_pri ? half : 0; |
| 301 | const uint16_t end = start + half; |
| 302 | uint16_t id; |
| 303 | |
| 304 | spin_lock(&guc->host2guc_lock); |
| 305 | id = find_next_zero_bit(guc->doorbell_bitmap, end, start); |
| 306 | if (id == end) |
| 307 | id = GUC_INVALID_DOORBELL_ID; |
| 308 | else |
| 309 | bitmap_set(guc->doorbell_bitmap, id, 1); |
| 310 | spin_unlock(&guc->host2guc_lock); |
| 311 | |
| 312 | DRM_DEBUG_DRIVER("assigned %s priority doorbell id 0x%x\n", |
| 313 | hi_pri ? "high" : "normal", id); |
| 314 | |
| 315 | return id; |
| 316 | } |
| 317 | |
| 318 | static void release_doorbell(struct intel_guc *guc, uint16_t id) |
| 319 | { |
| 320 | spin_lock(&guc->host2guc_lock); |
| 321 | bitmap_clear(guc->doorbell_bitmap, id, 1); |
| 322 | spin_unlock(&guc->host2guc_lock); |
| 323 | } |
| 324 | |
| 325 | /* |
| 326 | * Initialise the process descriptor shared with the GuC firmware. |
| 327 | */ |
| 328 | static void guc_init_proc_desc(struct intel_guc *guc, |
| 329 | struct i915_guc_client *client) |
| 330 | { |
| 331 | struct guc_process_desc *desc; |
| 332 | void *base; |
| 333 | |
| 334 | base = kmap_atomic(i915_gem_object_get_page(client->client_obj, 0)); |
| 335 | desc = base + client->proc_desc_offset; |
| 336 | |
| 337 | memset(desc, 0, sizeof(*desc)); |
| 338 | |
| 339 | /* |
| 340 | * XXX: pDoorbell and WQVBaseAddress are pointers in process address |
| 341 | * space for ring3 clients (set them as in mmap_ioctl) or kernel |
| 342 | * space for kernel clients (map on demand instead? May make debug |
| 343 | * easier to have it mapped). |
| 344 | */ |
| 345 | desc->wq_base_addr = 0; |
| 346 | desc->db_base_addr = 0; |
| 347 | |
| 348 | desc->context_id = client->ctx_index; |
| 349 | desc->wq_size_bytes = client->wq_size; |
| 350 | desc->wq_status = WQ_STATUS_ACTIVE; |
| 351 | desc->priority = client->priority; |
| 352 | |
| 353 | kunmap_atomic(base); |
| 354 | } |
| 355 | |
| 356 | /* |
| 357 | * Initialise/clear the context descriptor shared with the GuC firmware. |
| 358 | * |
| 359 | * This descriptor tells the GuC where (in GGTT space) to find the important |
| 360 | * data structures relating to this client (doorbell, process descriptor, |
| 361 | * write queue, etc). |
| 362 | */ |
| 363 | |
| 364 | static void guc_init_ctx_desc(struct intel_guc *guc, |
| 365 | struct i915_guc_client *client) |
| 366 | { |
| 367 | struct guc_context_desc desc; |
| 368 | struct sg_table *sg; |
| 369 | |
| 370 | memset(&desc, 0, sizeof(desc)); |
| 371 | |
| 372 | desc.attribute = GUC_CTX_DESC_ATTR_ACTIVE | GUC_CTX_DESC_ATTR_KERNEL; |
| 373 | desc.context_id = client->ctx_index; |
| 374 | desc.priority = client->priority; |
| 375 | desc.engines_used = (1 << RCS) | (1 << VCS) | (1 << BCS) | |
| 376 | (1 << VECS) | (1 << VCS2); /* all engines */ |
| 377 | desc.db_id = client->doorbell_id; |
| 378 | |
| 379 | /* |
| 380 | * The CPU address is only needed at certain points, so kmap_atomic on |
| 381 | * demand instead of storing it in the ctx descriptor. |
| 382 | * XXX: May make debug easier to have it mapped |
| 383 | */ |
| 384 | desc.db_trigger_cpu = 0; |
| 385 | desc.db_trigger_uk = client->doorbell_offset + |
| 386 | i915_gem_obj_ggtt_offset(client->client_obj); |
| 387 | desc.db_trigger_phy = client->doorbell_offset + |
| 388 | sg_dma_address(client->client_obj->pages->sgl); |
| 389 | |
| 390 | desc.process_desc = client->proc_desc_offset + |
| 391 | i915_gem_obj_ggtt_offset(client->client_obj); |
| 392 | |
| 393 | desc.wq_addr = client->wq_offset + |
| 394 | i915_gem_obj_ggtt_offset(client->client_obj); |
| 395 | |
| 396 | desc.wq_size = client->wq_size; |
| 397 | |
| 398 | /* |
| 399 | * XXX: Take LRCs from an existing intel_context if this is not an |
| 400 | * IsKMDCreatedContext client |
| 401 | */ |
| 402 | desc.desc_private = (uintptr_t)client; |
| 403 | |
| 404 | /* Pool context is pinned already */ |
| 405 | sg = guc->ctx_pool_obj->pages; |
| 406 | sg_pcopy_from_buffer(sg->sgl, sg->nents, &desc, sizeof(desc), |
| 407 | sizeof(desc) * client->ctx_index); |
| 408 | } |
| 409 | |
| 410 | static void guc_fini_ctx_desc(struct intel_guc *guc, |
| 411 | struct i915_guc_client *client) |
| 412 | { |
| 413 | struct guc_context_desc desc; |
| 414 | struct sg_table *sg; |
| 415 | |
| 416 | memset(&desc, 0, sizeof(desc)); |
| 417 | |
| 418 | sg = guc->ctx_pool_obj->pages; |
| 419 | sg_pcopy_from_buffer(sg->sgl, sg->nents, &desc, sizeof(desc), |
| 420 | sizeof(desc) * client->ctx_index); |
| 421 | } |
| 422 | |
| 423 | /* Get valid workqueue item and return it back to offset */ |
| 424 | static int guc_get_workqueue_space(struct i915_guc_client *gc, u32 *offset) |
| 425 | { |
| 426 | struct guc_process_desc *desc; |
| 427 | void *base; |
| 428 | u32 size = sizeof(struct guc_wq_item); |
| 429 | int ret = 0, timeout_counter = 200; |
| 430 | |
| 431 | base = kmap_atomic(i915_gem_object_get_page(gc->client_obj, 0)); |
| 432 | desc = base + gc->proc_desc_offset; |
| 433 | |
| 434 | while (timeout_counter-- > 0) { |
| 435 | ret = wait_for_atomic(CIRC_SPACE(gc->wq_tail, desc->head, |
| 436 | gc->wq_size) >= size, 1); |
| 437 | |
| 438 | if (!ret) { |
| 439 | *offset = gc->wq_tail; |
| 440 | |
| 441 | /* advance the tail for next workqueue item */ |
| 442 | gc->wq_tail += size; |
| 443 | gc->wq_tail &= gc->wq_size - 1; |
| 444 | |
| 445 | /* this will break the loop */ |
| 446 | timeout_counter = 0; |
| 447 | } |
| 448 | }; |
| 449 | |
| 450 | kunmap_atomic(base); |
| 451 | |
| 452 | return ret; |
| 453 | } |
| 454 | |
| 455 | static int guc_add_workqueue_item(struct i915_guc_client *gc, |
| 456 | struct drm_i915_gem_request *rq) |
| 457 | { |
| 458 | enum intel_ring_id ring_id = rq->ring->id; |
| 459 | struct guc_wq_item *wqi; |
| 460 | void *base; |
| 461 | u32 tail, wq_len, wq_off = 0; |
| 462 | int ret; |
| 463 | |
| 464 | ret = guc_get_workqueue_space(gc, &wq_off); |
| 465 | if (ret) |
| 466 | return ret; |
| 467 | |
| 468 | /* For now workqueue item is 4 DWs; workqueue buffer is 2 pages. So we |
| 469 | * should not have the case where structure wqi is across page, neither |
| 470 | * wrapped to the beginning. This simplifies the implementation below. |
| 471 | * |
| 472 | * XXX: if not the case, we need save data to a temp wqi and copy it to |
| 473 | * workqueue buffer dw by dw. |
| 474 | */ |
| 475 | WARN_ON(sizeof(struct guc_wq_item) != 16); |
| 476 | WARN_ON(wq_off & 3); |
| 477 | |
| 478 | /* wq starts from the page after doorbell / process_desc */ |
| 479 | base = kmap_atomic(i915_gem_object_get_page(gc->client_obj, |
| 480 | (wq_off + GUC_DB_SIZE) >> PAGE_SHIFT)); |
| 481 | wq_off &= PAGE_SIZE - 1; |
| 482 | wqi = (struct guc_wq_item *)((char *)base + wq_off); |
| 483 | |
| 484 | /* len does not include the header */ |
| 485 | wq_len = sizeof(struct guc_wq_item) / sizeof(u32) - 1; |
| 486 | wqi->header = WQ_TYPE_INORDER | |
| 487 | (wq_len << WQ_LEN_SHIFT) | |
| 488 | (ring_id << WQ_TARGET_SHIFT) | |
| 489 | WQ_NO_WCFLUSH_WAIT; |
| 490 | |
| 491 | /* The GuC wants only the low-order word of the context descriptor */ |
| 492 | wqi->context_desc = (u32)intel_lr_context_descriptor(rq->ctx, rq->ring); |
| 493 | |
| 494 | /* The GuC firmware wants the tail index in QWords, not bytes */ |
| 495 | tail = rq->ringbuf->tail >> 3; |
| 496 | wqi->ring_tail = tail << WQ_RING_TAIL_SHIFT; |
| 497 | wqi->fence_id = 0; /*XXX: what fence to be here */ |
| 498 | |
| 499 | kunmap_atomic(base); |
| 500 | |
| 501 | return 0; |
| 502 | } |
| 503 | |
| 504 | /** |
| 505 | * i915_guc_submit() - Submit commands through GuC |
| 506 | * @client: the guc client where commands will go through |
| 507 | * @ctx: LRC where commands come from |
| 508 | * @ring: HW engine that will excute the commands |
| 509 | * |
| 510 | * Return: 0 if succeed |
| 511 | */ |
| 512 | int i915_guc_submit(struct i915_guc_client *client, |
| 513 | struct drm_i915_gem_request *rq) |
| 514 | { |
| 515 | struct intel_guc *guc = client->guc; |
| 516 | enum intel_ring_id ring_id = rq->ring->id; |
| 517 | unsigned long flags; |
| 518 | int q_ret, b_ret; |
| 519 | |
| 520 | spin_lock_irqsave(&client->wq_lock, flags); |
| 521 | |
| 522 | q_ret = guc_add_workqueue_item(client, rq); |
| 523 | if (q_ret == 0) |
| 524 | b_ret = guc_ring_doorbell(client); |
| 525 | |
| 526 | client->submissions[ring_id] += 1; |
| 527 | if (q_ret) { |
| 528 | client->q_fail += 1; |
| 529 | client->retcode = q_ret; |
| 530 | } else if (b_ret) { |
| 531 | client->b_fail += 1; |
| 532 | client->retcode = q_ret = b_ret; |
| 533 | } else { |
| 534 | client->retcode = 0; |
| 535 | } |
| 536 | spin_unlock_irqrestore(&client->wq_lock, flags); |
| 537 | |
| 538 | spin_lock(&guc->host2guc_lock); |
| 539 | guc->submissions[ring_id] += 1; |
| 540 | guc->last_seqno[ring_id] = rq->seqno; |
| 541 | spin_unlock(&guc->host2guc_lock); |
| 542 | |
| 543 | return q_ret; |
| 544 | } |
| 545 | |
| 546 | /* |
| 547 | * Everything below here is concerned with setup & teardown, and is |
| 548 | * therefore not part of the somewhat time-critical batch-submission |
| 549 | * path of i915_guc_submit() above. |
| 550 | */ |
| 551 | |
| 552 | /** |
Alex Dai | bac427f | 2015-08-12 15:43:39 +0100 | [diff] [blame] | 553 | * gem_allocate_guc_obj() - Allocate gem object for GuC usage |
| 554 | * @dev: drm device |
| 555 | * @size: size of object |
| 556 | * |
| 557 | * This is a wrapper to create a gem obj. In order to use it inside GuC, the |
| 558 | * object needs to be pinned lifetime. Also we must pin it to gtt space other |
| 559 | * than [0, GUC_WOPCM_TOP) because this range is reserved inside GuC. |
| 560 | * |
| 561 | * Return: A drm_i915_gem_object if successful, otherwise NULL. |
| 562 | */ |
| 563 | static struct drm_i915_gem_object *gem_allocate_guc_obj(struct drm_device *dev, |
| 564 | u32 size) |
| 565 | { |
| 566 | struct drm_i915_private *dev_priv = dev->dev_private; |
| 567 | struct drm_i915_gem_object *obj; |
| 568 | |
| 569 | obj = i915_gem_alloc_object(dev, size); |
| 570 | if (!obj) |
| 571 | return NULL; |
| 572 | |
| 573 | if (i915_gem_object_get_pages(obj)) { |
| 574 | drm_gem_object_unreference(&obj->base); |
| 575 | return NULL; |
| 576 | } |
| 577 | |
| 578 | if (i915_gem_obj_ggtt_pin(obj, PAGE_SIZE, |
| 579 | PIN_OFFSET_BIAS | GUC_WOPCM_TOP)) { |
| 580 | drm_gem_object_unreference(&obj->base); |
| 581 | return NULL; |
| 582 | } |
| 583 | |
| 584 | /* Invalidate GuC TLB to let GuC take the latest updates to GTT. */ |
| 585 | I915_WRITE(GEN8_GTCR, GEN8_GTCR_INVALIDATE); |
| 586 | |
| 587 | return obj; |
| 588 | } |
| 589 | |
| 590 | /** |
| 591 | * gem_release_guc_obj() - Release gem object allocated for GuC usage |
| 592 | * @obj: gem obj to be released |
| 593 | */ |
| 594 | static void gem_release_guc_obj(struct drm_i915_gem_object *obj) |
| 595 | { |
| 596 | if (!obj) |
| 597 | return; |
| 598 | |
| 599 | if (i915_gem_obj_is_pinned(obj)) |
| 600 | i915_gem_object_ggtt_unpin(obj); |
| 601 | |
| 602 | drm_gem_object_unreference(&obj->base); |
| 603 | } |
| 604 | |
Dave Gordon | 44a28b1 | 2015-08-12 15:43:41 +0100 | [diff] [blame^] | 605 | static void guc_client_free(struct drm_device *dev, |
| 606 | struct i915_guc_client *client) |
| 607 | { |
| 608 | struct drm_i915_private *dev_priv = dev->dev_private; |
| 609 | struct intel_guc *guc = &dev_priv->guc; |
| 610 | |
| 611 | if (!client) |
| 612 | return; |
| 613 | |
| 614 | if (client->doorbell_id != GUC_INVALID_DOORBELL_ID) { |
| 615 | /* |
| 616 | * First disable the doorbell, then tell the GuC we've |
| 617 | * finished with it, finally deallocate it in our bitmap |
| 618 | */ |
| 619 | guc_disable_doorbell(guc, client); |
| 620 | host2guc_release_doorbell(guc, client); |
| 621 | release_doorbell(guc, client->doorbell_id); |
| 622 | } |
| 623 | |
| 624 | /* |
| 625 | * XXX: wait for any outstanding submissions before freeing memory. |
| 626 | * Be sure to drop any locks |
| 627 | */ |
| 628 | |
| 629 | gem_release_guc_obj(client->client_obj); |
| 630 | |
| 631 | if (client->ctx_index != GUC_INVALID_CTX_ID) { |
| 632 | guc_fini_ctx_desc(guc, client); |
| 633 | ida_simple_remove(&guc->ctx_ids, client->ctx_index); |
| 634 | } |
| 635 | |
| 636 | kfree(client); |
| 637 | } |
| 638 | |
| 639 | /** |
| 640 | * guc_client_alloc() - Allocate an i915_guc_client |
| 641 | * @dev: drm device |
| 642 | * @priority: four levels priority _CRITICAL, _HIGH, _NORMAL and _LOW |
| 643 | * The kernel client to replace ExecList submission is created with |
| 644 | * NORMAL priority. Priority of a client for scheduler can be HIGH, |
| 645 | * while a preemption context can use CRITICAL. |
| 646 | * |
| 647 | * Return: An i915_guc_client object if success. |
| 648 | */ |
| 649 | static struct i915_guc_client *guc_client_alloc(struct drm_device *dev, |
| 650 | uint32_t priority) |
| 651 | { |
| 652 | struct i915_guc_client *client; |
| 653 | struct drm_i915_private *dev_priv = dev->dev_private; |
| 654 | struct intel_guc *guc = &dev_priv->guc; |
| 655 | struct drm_i915_gem_object *obj; |
| 656 | |
| 657 | client = kzalloc(sizeof(*client), GFP_KERNEL); |
| 658 | if (!client) |
| 659 | return NULL; |
| 660 | |
| 661 | client->doorbell_id = GUC_INVALID_DOORBELL_ID; |
| 662 | client->priority = priority; |
| 663 | client->guc = guc; |
| 664 | |
| 665 | client->ctx_index = (uint32_t)ida_simple_get(&guc->ctx_ids, 0, |
| 666 | GUC_MAX_GPU_CONTEXTS, GFP_KERNEL); |
| 667 | if (client->ctx_index >= GUC_MAX_GPU_CONTEXTS) { |
| 668 | client->ctx_index = GUC_INVALID_CTX_ID; |
| 669 | goto err; |
| 670 | } |
| 671 | |
| 672 | /* The first page is doorbell/proc_desc. Two followed pages are wq. */ |
| 673 | obj = gem_allocate_guc_obj(dev, GUC_DB_SIZE + GUC_WQ_SIZE); |
| 674 | if (!obj) |
| 675 | goto err; |
| 676 | |
| 677 | client->client_obj = obj; |
| 678 | client->wq_offset = GUC_DB_SIZE; |
| 679 | client->wq_size = GUC_WQ_SIZE; |
| 680 | spin_lock_init(&client->wq_lock); |
| 681 | |
| 682 | client->doorbell_offset = select_doorbell_cacheline(guc); |
| 683 | |
| 684 | /* |
| 685 | * Since the doorbell only requires a single cacheline, we can save |
| 686 | * space by putting the application process descriptor in the same |
| 687 | * page. Use the half of the page that doesn't include the doorbell. |
| 688 | */ |
| 689 | if (client->doorbell_offset >= (GUC_DB_SIZE / 2)) |
| 690 | client->proc_desc_offset = 0; |
| 691 | else |
| 692 | client->proc_desc_offset = (GUC_DB_SIZE / 2); |
| 693 | |
| 694 | client->doorbell_id = assign_doorbell(guc, client->priority); |
| 695 | if (client->doorbell_id == GUC_INVALID_DOORBELL_ID) |
| 696 | /* XXX: evict a doorbell instead */ |
| 697 | goto err; |
| 698 | |
| 699 | guc_init_proc_desc(guc, client); |
| 700 | guc_init_ctx_desc(guc, client); |
| 701 | guc_init_doorbell(guc, client); |
| 702 | |
| 703 | /* XXX: Any cache flushes needed? General domain mgmt calls? */ |
| 704 | |
| 705 | if (host2guc_allocate_doorbell(guc, client)) |
| 706 | goto err; |
| 707 | |
| 708 | DRM_DEBUG_DRIVER("new priority %u client %p: ctx_index %u db_id %u\n", |
| 709 | priority, client, client->ctx_index, client->doorbell_id); |
| 710 | |
| 711 | return client; |
| 712 | |
| 713 | err: |
| 714 | DRM_ERROR("FAILED to create priority %u GuC client!\n", priority); |
| 715 | |
| 716 | guc_client_free(dev, client); |
| 717 | return NULL; |
| 718 | } |
| 719 | |
Alex Dai | 4c7e77f | 2015-08-12 15:43:40 +0100 | [diff] [blame] | 720 | static void guc_create_log(struct intel_guc *guc) |
| 721 | { |
| 722 | struct drm_i915_private *dev_priv = guc_to_i915(guc); |
| 723 | struct drm_i915_gem_object *obj; |
| 724 | unsigned long offset; |
| 725 | uint32_t size, flags; |
| 726 | |
| 727 | if (i915.guc_log_level < GUC_LOG_VERBOSITY_MIN) |
| 728 | return; |
| 729 | |
| 730 | if (i915.guc_log_level > GUC_LOG_VERBOSITY_MAX) |
| 731 | i915.guc_log_level = GUC_LOG_VERBOSITY_MAX; |
| 732 | |
| 733 | /* The first page is to save log buffer state. Allocate one |
| 734 | * extra page for others in case for overlap */ |
| 735 | size = (1 + GUC_LOG_DPC_PAGES + 1 + |
| 736 | GUC_LOG_ISR_PAGES + 1 + |
| 737 | GUC_LOG_CRASH_PAGES + 1) << PAGE_SHIFT; |
| 738 | |
| 739 | obj = guc->log_obj; |
| 740 | if (!obj) { |
| 741 | obj = gem_allocate_guc_obj(dev_priv->dev, size); |
| 742 | if (!obj) { |
| 743 | /* logging will be off */ |
| 744 | i915.guc_log_level = -1; |
| 745 | return; |
| 746 | } |
| 747 | |
| 748 | guc->log_obj = obj; |
| 749 | } |
| 750 | |
| 751 | /* each allocated unit is a page */ |
| 752 | flags = GUC_LOG_VALID | GUC_LOG_NOTIFY_ON_HALF_FULL | |
| 753 | (GUC_LOG_DPC_PAGES << GUC_LOG_DPC_SHIFT) | |
| 754 | (GUC_LOG_ISR_PAGES << GUC_LOG_ISR_SHIFT) | |
| 755 | (GUC_LOG_CRASH_PAGES << GUC_LOG_CRASH_SHIFT); |
| 756 | |
| 757 | offset = i915_gem_obj_ggtt_offset(obj) >> PAGE_SHIFT; /* in pages */ |
| 758 | guc->log_flags = (offset << GUC_LOG_BUF_ADDR_SHIFT) | flags; |
| 759 | } |
| 760 | |
Alex Dai | bac427f | 2015-08-12 15:43:39 +0100 | [diff] [blame] | 761 | /* |
| 762 | * Set up the memory resources to be shared with the GuC. At this point, |
| 763 | * we require just one object that can be mapped through the GGTT. |
| 764 | */ |
| 765 | int i915_guc_submission_init(struct drm_device *dev) |
| 766 | { |
| 767 | struct drm_i915_private *dev_priv = dev->dev_private; |
| 768 | const size_t ctxsize = sizeof(struct guc_context_desc); |
| 769 | const size_t poolsize = GUC_MAX_GPU_CONTEXTS * ctxsize; |
| 770 | const size_t gemsize = round_up(poolsize, PAGE_SIZE); |
| 771 | struct intel_guc *guc = &dev_priv->guc; |
| 772 | |
| 773 | if (!i915.enable_guc_submission) |
| 774 | return 0; /* not enabled */ |
| 775 | |
| 776 | if (guc->ctx_pool_obj) |
| 777 | return 0; /* already allocated */ |
| 778 | |
| 779 | guc->ctx_pool_obj = gem_allocate_guc_obj(dev_priv->dev, gemsize); |
| 780 | if (!guc->ctx_pool_obj) |
| 781 | return -ENOMEM; |
| 782 | |
Dave Gordon | 44a28b1 | 2015-08-12 15:43:41 +0100 | [diff] [blame^] | 783 | spin_lock_init(&dev_priv->guc.host2guc_lock); |
| 784 | |
Alex Dai | bac427f | 2015-08-12 15:43:39 +0100 | [diff] [blame] | 785 | ida_init(&guc->ctx_ids); |
| 786 | |
Alex Dai | 4c7e77f | 2015-08-12 15:43:40 +0100 | [diff] [blame] | 787 | guc_create_log(guc); |
| 788 | |
Alex Dai | bac427f | 2015-08-12 15:43:39 +0100 | [diff] [blame] | 789 | return 0; |
| 790 | } |
| 791 | |
Dave Gordon | 44a28b1 | 2015-08-12 15:43:41 +0100 | [diff] [blame^] | 792 | int i915_guc_submission_enable(struct drm_device *dev) |
| 793 | { |
| 794 | struct drm_i915_private *dev_priv = dev->dev_private; |
| 795 | struct intel_guc *guc = &dev_priv->guc; |
| 796 | struct i915_guc_client *client; |
| 797 | |
| 798 | /* client for execbuf submission */ |
| 799 | client = guc_client_alloc(dev, GUC_CTX_PRIORITY_KMD_NORMAL); |
| 800 | if (!client) { |
| 801 | DRM_ERROR("Failed to create execbuf guc_client\n"); |
| 802 | return -ENOMEM; |
| 803 | } |
| 804 | |
| 805 | guc->execbuf_client = client; |
| 806 | return 0; |
| 807 | } |
| 808 | |
| 809 | void i915_guc_submission_disable(struct drm_device *dev) |
| 810 | { |
| 811 | struct drm_i915_private *dev_priv = dev->dev_private; |
| 812 | struct intel_guc *guc = &dev_priv->guc; |
| 813 | |
| 814 | guc_client_free(dev, guc->execbuf_client); |
| 815 | guc->execbuf_client = NULL; |
| 816 | } |
| 817 | |
Alex Dai | bac427f | 2015-08-12 15:43:39 +0100 | [diff] [blame] | 818 | void i915_guc_submission_fini(struct drm_device *dev) |
| 819 | { |
| 820 | struct drm_i915_private *dev_priv = dev->dev_private; |
| 821 | struct intel_guc *guc = &dev_priv->guc; |
| 822 | |
Alex Dai | 4c7e77f | 2015-08-12 15:43:40 +0100 | [diff] [blame] | 823 | gem_release_guc_obj(dev_priv->guc.log_obj); |
| 824 | guc->log_obj = NULL; |
| 825 | |
Alex Dai | bac427f | 2015-08-12 15:43:39 +0100 | [diff] [blame] | 826 | if (guc->ctx_pool_obj) |
| 827 | ida_destroy(&guc->ctx_ids); |
| 828 | gem_release_guc_obj(guc->ctx_pool_obj); |
| 829 | guc->ctx_pool_obj = NULL; |
| 830 | } |