2 * Copyright © 2014 Intel Corporation
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:
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
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
24 * Ben Widawsky <ben@bwidawsk.net>
25 * Michel Thierry <michel.thierry@intel.com>
26 * Thomas Daniel <thomas.daniel@intel.com>
27 * Oscar Mateo <oscar.mateo@intel.com>
32 * DOC: Logical Rings, Logical Ring Contexts and Execlists
35 * GEN8 brings an expansion of the HW contexts: "Logical Ring Contexts".
36 * These expanded contexts enable a number of new abilities, especially
37 * "Execlists" (also implemented in this file).
39 * One of the main differences with the legacy HW contexts is that logical
40 * ring contexts incorporate many more things to the context's state, like
41 * PDPs or ringbuffer control registers:
43 * The reason why PDPs are included in the context is straightforward: as
44 * PPGTTs (per-process GTTs) are actually per-context, having the PDPs
45 * contained there mean you don't need to do a ppgtt->switch_mm yourself,
46 * instead, the GPU will do it for you on the context switch.
48 * But, what about the ringbuffer control registers (head, tail, etc..)?
49 * shouldn't we just need a set of those per engine command streamer? This is
50 * where the name "Logical Rings" starts to make sense: by virtualizing the
51 * rings, the engine cs shifts to a new "ring buffer" with every context
52 * switch. When you want to submit a workload to the GPU you: A) choose your
53 * context, B) find its appropriate virtualized ring, C) write commands to it
54 * and then, finally, D) tell the GPU to switch to that context.
56 * Instead of the legacy MI_SET_CONTEXT, the way you tell the GPU to switch
57 * to a contexts is via a context execution list, ergo "Execlists".
60 * Regarding the creation of contexts, we have:
62 * - One global default context.
63 * - One local default context for each opened fd.
64 * - One local extra context for each context create ioctl call.
66 * Now that ringbuffers belong per-context (and not per-engine, like before)
67 * and that contexts are uniquely tied to a given engine (and not reusable,
68 * like before) we need:
70 * - One ringbuffer per-engine inside each context.
71 * - One backing object per-engine inside each context.
73 * The global default context starts its life with these new objects fully
74 * allocated and populated. The local default context for each opened fd is
75 * more complex, because we don't know at creation time which engine is going
76 * to use them. To handle this, we have implemented a deferred creation of LR
79 * The local context starts its life as a hollow or blank holder, that only
80 * gets populated for a given engine once we receive an execbuffer. If later
81 * on we receive another execbuffer ioctl for the same context but a different
82 * engine, we allocate/populate a new ringbuffer and context backing object and
85 * Finally, regarding local contexts created using the ioctl call: as they are
86 * only allowed with the render ring, we can allocate & populate them right
87 * away (no need to defer anything, at least for now).
89 * Execlists implementation:
90 * Execlists are the new method by which, on gen8+ hardware, workloads are
91 * submitted for execution (as opposed to the legacy, ringbuffer-based, method).
92 * This method works as follows:
94 * When a request is committed, its commands (the BB start and any leading or
95 * trailing commands, like the seqno breadcrumbs) are placed in the ringbuffer
96 * for the appropriate context. The tail pointer in the hardware context is not
97 * updated at this time, but instead, kept by the driver in the ringbuffer
98 * structure. A structure representing this request is added to a request queue
99 * for the appropriate engine: this structure contains a copy of the context's
100 * tail after the request was written to the ring buffer and a pointer to the
103 * If the engine's request queue was empty before the request was added, the
104 * queue is processed immediately. Otherwise the queue will be processed during
105 * a context switch interrupt. In any case, elements on the queue will get sent
106 * (in pairs) to the GPU's ExecLists Submit Port (ELSP, for short) with a
107 * globally unique 20-bits submission ID.
109 * When execution of a request completes, the GPU updates the context status
110 * buffer with a context complete event and generates a context switch interrupt.
111 * During the interrupt handling, the driver examines the events in the buffer:
112 * for each context complete event, if the announced ID matches that on the head
113 * of the request queue, then that request is retired and removed from the queue.
115 * After processing, if any requests were retired and the queue is not empty
116 * then a new execution list can be submitted. The two requests at the front of
117 * the queue are next to be submitted but since a context may not occur twice in
118 * an execution list, if subsequent requests have the same ID as the first then
119 * the two requests must be combined. This is done simply by discarding requests
120 * at the head of the queue until either only one requests is left (in which case
121 * we use a NULL second context) or the first two requests have unique IDs.
123 * By always executing the first two requests in the queue the driver ensures
124 * that the GPU is kept as busy as possible. In the case where a single context
125 * completes but a second context is still executing, the request for this second
126 * context will be at the head of the queue when we remove the first one. This
127 * request will then be resubmitted along with a new request for a different context,
128 * which will cause the hardware to continue executing the second request and queue
129 * the new request (the GPU detects the condition of a context getting preempted
130 * with the same context and optimizes the context switch flow by not doing
131 * preemption, but just sampling the new tail pointer).
135 #include <drm/drmP.h>
136 #include <drm/i915_drm.h>
137 #include "i915_drv.h"
139 #define GEN9_LR_CONTEXT_RENDER_SIZE (22 * PAGE_SIZE)
140 #define GEN8_LR_CONTEXT_RENDER_SIZE (20 * PAGE_SIZE)
141 #define GEN8_LR_CONTEXT_OTHER_SIZE (2 * PAGE_SIZE)
143 #define RING_EXECLIST_QFULL (1 << 0x2)
144 #define RING_EXECLIST1_VALID (1 << 0x3)
145 #define RING_EXECLIST0_VALID (1 << 0x4)
146 #define RING_EXECLIST_ACTIVE_STATUS (3 << 0xE)
147 #define RING_EXECLIST1_ACTIVE (1 << 0x11)
148 #define RING_EXECLIST0_ACTIVE (1 << 0x12)
150 #define GEN8_CTX_STATUS_IDLE_ACTIVE (1 << 0)
151 #define GEN8_CTX_STATUS_PREEMPTED (1 << 1)
152 #define GEN8_CTX_STATUS_ELEMENT_SWITCH (1 << 2)
153 #define GEN8_CTX_STATUS_ACTIVE_IDLE (1 << 3)
154 #define GEN8_CTX_STATUS_COMPLETE (1 << 4)
155 #define GEN8_CTX_STATUS_LITE_RESTORE (1 << 15)
157 #define CTX_LRI_HEADER_0 0x01
158 #define CTX_CONTEXT_CONTROL 0x02
159 #define CTX_RING_HEAD 0x04
160 #define CTX_RING_TAIL 0x06
161 #define CTX_RING_BUFFER_START 0x08
162 #define CTX_RING_BUFFER_CONTROL 0x0a
163 #define CTX_BB_HEAD_U 0x0c
164 #define CTX_BB_HEAD_L 0x0e
165 #define CTX_BB_STATE 0x10
166 #define CTX_SECOND_BB_HEAD_U 0x12
167 #define CTX_SECOND_BB_HEAD_L 0x14
168 #define CTX_SECOND_BB_STATE 0x16
169 #define CTX_BB_PER_CTX_PTR 0x18
170 #define CTX_RCS_INDIRECT_CTX 0x1a
171 #define CTX_RCS_INDIRECT_CTX_OFFSET 0x1c
172 #define CTX_LRI_HEADER_1 0x21
173 #define CTX_CTX_TIMESTAMP 0x22
174 #define CTX_PDP3_UDW 0x24
175 #define CTX_PDP3_LDW 0x26
176 #define CTX_PDP2_UDW 0x28
177 #define CTX_PDP2_LDW 0x2a
178 #define CTX_PDP1_UDW 0x2c
179 #define CTX_PDP1_LDW 0x2e
180 #define CTX_PDP0_UDW 0x30
181 #define CTX_PDP0_LDW 0x32
182 #define CTX_LRI_HEADER_2 0x41
183 #define CTX_R_PWR_CLK_STATE 0x42
184 #define CTX_GPGPU_CSR_BASE_ADDRESS 0x44
186 #define GEN8_CTX_VALID (1<<0)
187 #define GEN8_CTX_FORCE_PD_RESTORE (1<<1)
188 #define GEN8_CTX_FORCE_RESTORE (1<<2)
189 #define GEN8_CTX_L3LLC_COHERENT (1<<5)
190 #define GEN8_CTX_PRIVILEGE (1<<8)
192 #define ASSIGN_CTX_PDP(ppgtt, reg_state, n) { \
193 const u64 _addr = i915_page_dir_dma_addr((ppgtt), (n)); \
194 reg_state[CTX_PDP ## n ## _UDW+1] = upper_32_bits(_addr); \
195 reg_state[CTX_PDP ## n ## _LDW+1] = lower_32_bits(_addr); \
199 ADVANCED_CONTEXT = 0,
204 #define GEN8_CTX_MODE_SHIFT 3
207 FAULT_AND_HALT, /* Debug only */
209 FAULT_AND_CONTINUE /* Unsupported */
211 #define GEN8_CTX_ID_SHIFT 32
212 #define CTX_RCS_INDIRECT_CTX_OFFSET_DEFAULT 0x17
214 static int intel_lr_context_pin(struct intel_engine_cs *ring,
215 struct intel_context *ctx);
218 * intel_sanitize_enable_execlists() - sanitize i915.enable_execlists
220 * @enable_execlists: value of i915.enable_execlists module parameter.
222 * Only certain platforms support Execlists (the prerequisites being
223 * support for Logical Ring Contexts and Aliasing PPGTT or better).
225 * Return: 1 if Execlists is supported and has to be enabled.
227 int intel_sanitize_enable_execlists(struct drm_device *dev, int enable_execlists)
229 WARN_ON(i915.enable_ppgtt == -1);
231 if (INTEL_INFO(dev)->gen >= 9)
234 if (enable_execlists == 0)
237 if (HAS_LOGICAL_RING_CONTEXTS(dev) && USES_PPGTT(dev) &&
238 i915.use_mmio_flip >= 0)
245 * intel_execlists_ctx_id() - get the Execlists Context ID
246 * @ctx_obj: Logical Ring Context backing object.
248 * Do not confuse with ctx->id! Unfortunately we have a name overload
249 * here: the old context ID we pass to userspace as a handler so that
250 * they can refer to a context, and the new context ID we pass to the
251 * ELSP so that the GPU can inform us of the context status via
254 * Return: 20-bits globally unique context ID.
256 u32 intel_execlists_ctx_id(struct drm_i915_gem_object *ctx_obj)
258 u32 lrca = i915_gem_obj_ggtt_offset(ctx_obj);
260 /* LRCA is required to be 4K aligned so the more significant 20 bits
261 * are globally unique */
265 static uint64_t execlists_ctx_descriptor(struct intel_engine_cs *ring,
266 struct drm_i915_gem_object *ctx_obj)
268 struct drm_device *dev = ring->dev;
270 uint64_t lrca = i915_gem_obj_ggtt_offset(ctx_obj);
272 WARN_ON(lrca & 0xFFFFFFFF00000FFFULL);
274 desc = GEN8_CTX_VALID;
275 desc |= LEGACY_CONTEXT << GEN8_CTX_MODE_SHIFT;
276 if (IS_GEN8(ctx_obj->base.dev))
277 desc |= GEN8_CTX_L3LLC_COHERENT;
278 desc |= GEN8_CTX_PRIVILEGE;
280 desc |= (u64)intel_execlists_ctx_id(ctx_obj) << GEN8_CTX_ID_SHIFT;
282 /* TODO: WaDisableLiteRestore when we start using semaphore
283 * signalling between Command Streamers */
284 /* desc |= GEN8_CTX_FORCE_RESTORE; */
286 /* WaEnableForceRestoreInCtxtDescForVCS:skl */
288 INTEL_REVID(dev) <= SKL_REVID_B0 &&
289 (ring->id == BCS || ring->id == VCS ||
290 ring->id == VECS || ring->id == VCS2))
291 desc |= GEN8_CTX_FORCE_RESTORE;
296 static void execlists_elsp_write(struct intel_engine_cs *ring,
297 struct drm_i915_gem_object *ctx_obj0,
298 struct drm_i915_gem_object *ctx_obj1)
300 struct drm_device *dev = ring->dev;
301 struct drm_i915_private *dev_priv = dev->dev_private;
305 /* XXX: You must always write both descriptors in the order below. */
307 temp = execlists_ctx_descriptor(ring, ctx_obj1);
310 desc[1] = (u32)(temp >> 32);
313 temp = execlists_ctx_descriptor(ring, ctx_obj0);
314 desc[3] = (u32)(temp >> 32);
317 spin_lock(&dev_priv->uncore.lock);
318 intel_uncore_forcewake_get__locked(dev_priv, FORCEWAKE_ALL);
319 I915_WRITE_FW(RING_ELSP(ring), desc[1]);
320 I915_WRITE_FW(RING_ELSP(ring), desc[0]);
321 I915_WRITE_FW(RING_ELSP(ring), desc[3]);
323 /* The context is automatically loaded after the following */
324 I915_WRITE_FW(RING_ELSP(ring), desc[2]);
326 /* ELSP is a wo register, so use another nearby reg for posting instead */
327 POSTING_READ_FW(RING_EXECLIST_STATUS(ring));
328 intel_uncore_forcewake_put__locked(dev_priv, FORCEWAKE_ALL);
329 spin_unlock(&dev_priv->uncore.lock);
332 static int execlists_update_context(struct drm_i915_gem_object *ctx_obj,
333 struct drm_i915_gem_object *ring_obj,
334 struct i915_hw_ppgtt *ppgtt,
340 page = i915_gem_object_get_page(ctx_obj, 1);
341 reg_state = kmap_atomic(page);
343 reg_state[CTX_RING_TAIL+1] = tail;
344 reg_state[CTX_RING_BUFFER_START+1] = i915_gem_obj_ggtt_offset(ring_obj);
346 /* True PPGTT with dynamic page allocation: update PDP registers and
347 * point the unallocated PDPs to the scratch page
350 ASSIGN_CTX_PDP(ppgtt, reg_state, 3);
351 ASSIGN_CTX_PDP(ppgtt, reg_state, 2);
352 ASSIGN_CTX_PDP(ppgtt, reg_state, 1);
353 ASSIGN_CTX_PDP(ppgtt, reg_state, 0);
356 kunmap_atomic(reg_state);
361 static void execlists_submit_requests(struct drm_i915_gem_request *rq0,
362 struct drm_i915_gem_request *rq1)
364 struct intel_engine_cs *ring = rq0->ring;
365 struct drm_i915_gem_object *ctx_obj0 = rq0->ctx->engine[ring->id].state;
366 struct drm_i915_gem_object *ctx_obj1 = NULL;
369 WARN_ON(!i915_gem_obj_is_pinned(ctx_obj0));
370 WARN_ON(!i915_gem_obj_is_pinned(rq0->ringbuf->obj));
372 execlists_update_context(ctx_obj1, rq0->ringbuf->obj,
373 rq0->ctx->ppgtt, rq0->tail);
376 ctx_obj1 = rq1->ctx->engine[ring->id].state;
379 WARN_ON(!i915_gem_obj_is_pinned(ctx_obj1));
380 WARN_ON(!i915_gem_obj_is_pinned(rq1->ringbuf->obj));
382 execlists_update_context(ctx_obj1, rq1->ringbuf->obj,
383 rq1->ctx->ppgtt, rq1->tail);
386 execlists_elsp_write(ring, ctx_obj0, ctx_obj1);
389 static void execlists_context_unqueue(struct intel_engine_cs *ring)
391 struct drm_i915_gem_request *req0 = NULL, *req1 = NULL;
392 struct drm_i915_gem_request *cursor = NULL, *tmp = NULL;
394 assert_spin_locked(&ring->execlist_lock);
397 * If irqs are not active generate a warning as batches that finish
398 * without the irqs may get lost and a GPU Hang may occur.
400 WARN_ON(!intel_irqs_enabled(ring->dev->dev_private));
402 if (list_empty(&ring->execlist_queue))
405 /* Try to read in pairs */
406 list_for_each_entry_safe(cursor, tmp, &ring->execlist_queue,
410 } else if (req0->ctx == cursor->ctx) {
411 /* Same ctx: ignore first request, as second request
412 * will update tail past first request's workload */
413 cursor->elsp_submitted = req0->elsp_submitted;
414 list_del(&req0->execlist_link);
415 list_add_tail(&req0->execlist_link,
416 &ring->execlist_retired_req_list);
424 if (IS_GEN8(ring->dev) || IS_GEN9(ring->dev)) {
426 * WaIdleLiteRestore: make sure we never cause a lite
427 * restore with HEAD==TAIL
429 if (req0->elsp_submitted) {
431 * Apply the wa NOOPS to prevent ring:HEAD == req:TAIL
432 * as we resubmit the request. See gen8_emit_request()
433 * for where we prepare the padding after the end of the
436 struct intel_ringbuffer *ringbuf;
438 ringbuf = req0->ctx->engine[ring->id].ringbuf;
440 req0->tail &= ringbuf->size - 1;
444 WARN_ON(req1 && req1->elsp_submitted);
446 execlists_submit_requests(req0, req1);
448 req0->elsp_submitted++;
450 req1->elsp_submitted++;
453 static bool execlists_check_remove_request(struct intel_engine_cs *ring,
456 struct drm_i915_gem_request *head_req;
458 assert_spin_locked(&ring->execlist_lock);
460 head_req = list_first_entry_or_null(&ring->execlist_queue,
461 struct drm_i915_gem_request,
464 if (head_req != NULL) {
465 struct drm_i915_gem_object *ctx_obj =
466 head_req->ctx->engine[ring->id].state;
467 if (intel_execlists_ctx_id(ctx_obj) == request_id) {
468 WARN(head_req->elsp_submitted == 0,
469 "Never submitted head request\n");
471 if (--head_req->elsp_submitted <= 0) {
472 list_del(&head_req->execlist_link);
473 list_add_tail(&head_req->execlist_link,
474 &ring->execlist_retired_req_list);
484 * intel_lrc_irq_handler() - handle Context Switch interrupts
485 * @ring: Engine Command Streamer to handle.
487 * Check the unread Context Status Buffers and manage the submission of new
488 * contexts to the ELSP accordingly.
490 void intel_lrc_irq_handler(struct intel_engine_cs *ring)
492 struct drm_i915_private *dev_priv = ring->dev->dev_private;
498 u32 submit_contexts = 0;
500 status_pointer = I915_READ(RING_CONTEXT_STATUS_PTR(ring));
502 read_pointer = ring->next_context_status_buffer;
503 write_pointer = status_pointer & 0x07;
504 if (read_pointer > write_pointer)
507 spin_lock(&ring->execlist_lock);
509 while (read_pointer < write_pointer) {
511 status = I915_READ(RING_CONTEXT_STATUS_BUF(ring) +
512 (read_pointer % 6) * 8);
513 status_id = I915_READ(RING_CONTEXT_STATUS_BUF(ring) +
514 (read_pointer % 6) * 8 + 4);
516 if (status & GEN8_CTX_STATUS_PREEMPTED) {
517 if (status & GEN8_CTX_STATUS_LITE_RESTORE) {
518 if (execlists_check_remove_request(ring, status_id))
519 WARN(1, "Lite Restored request removed from queue\n");
521 WARN(1, "Preemption without Lite Restore\n");
524 if ((status & GEN8_CTX_STATUS_ACTIVE_IDLE) ||
525 (status & GEN8_CTX_STATUS_ELEMENT_SWITCH)) {
526 if (execlists_check_remove_request(ring, status_id))
531 if (submit_contexts != 0)
532 execlists_context_unqueue(ring);
534 spin_unlock(&ring->execlist_lock);
536 WARN(submit_contexts > 2, "More than two context complete events?\n");
537 ring->next_context_status_buffer = write_pointer % 6;
539 I915_WRITE(RING_CONTEXT_STATUS_PTR(ring),
540 ((u32)ring->next_context_status_buffer & 0x07) << 8);
543 static int execlists_context_queue(struct drm_i915_gem_request *request)
545 struct intel_engine_cs *ring = request->ring;
546 struct drm_i915_gem_request *cursor;
547 int num_elements = 0;
549 if (request->ctx != ring->default_context)
550 intel_lr_context_pin(ring, request->ctx);
552 i915_gem_request_reference(request);
554 request->tail = request->ringbuf->tail;
556 spin_lock_irq(&ring->execlist_lock);
558 list_for_each_entry(cursor, &ring->execlist_queue, execlist_link)
559 if (++num_elements > 2)
562 if (num_elements > 2) {
563 struct drm_i915_gem_request *tail_req;
565 tail_req = list_last_entry(&ring->execlist_queue,
566 struct drm_i915_gem_request,
569 if (request->ctx == tail_req->ctx) {
570 WARN(tail_req->elsp_submitted != 0,
571 "More than 2 already-submitted reqs queued\n");
572 list_del(&tail_req->execlist_link);
573 list_add_tail(&tail_req->execlist_link,
574 &ring->execlist_retired_req_list);
578 list_add_tail(&request->execlist_link, &ring->execlist_queue);
579 if (num_elements == 0)
580 execlists_context_unqueue(ring);
582 spin_unlock_irq(&ring->execlist_lock);
587 static int logical_ring_invalidate_all_caches(struct drm_i915_gem_request *req)
589 struct intel_engine_cs *ring = req->ring;
590 uint32_t flush_domains;
594 if (ring->gpu_caches_dirty)
595 flush_domains = I915_GEM_GPU_DOMAINS;
597 ret = ring->emit_flush(req, I915_GEM_GPU_DOMAINS, flush_domains);
601 ring->gpu_caches_dirty = false;
605 static int execlists_move_to_gpu(struct drm_i915_gem_request *req,
606 struct list_head *vmas)
608 const unsigned other_rings = ~intel_ring_flag(req->ring);
609 struct i915_vma *vma;
610 uint32_t flush_domains = 0;
611 bool flush_chipset = false;
614 list_for_each_entry(vma, vmas, exec_list) {
615 struct drm_i915_gem_object *obj = vma->obj;
617 if (obj->active & other_rings) {
618 ret = i915_gem_object_sync(obj, req->ring, &req);
623 if (obj->base.write_domain & I915_GEM_DOMAIN_CPU)
624 flush_chipset |= i915_gem_clflush_object(obj, false);
626 flush_domains |= obj->base.write_domain;
629 if (flush_domains & I915_GEM_DOMAIN_GTT)
632 /* Unconditionally invalidate gpu caches and ensure that we do flush
633 * any residual writes from the previous batch.
635 return logical_ring_invalidate_all_caches(req);
638 int intel_logical_ring_alloc_request_extras(struct drm_i915_gem_request *request)
642 if (request->ctx != request->ring->default_context) {
643 ret = intel_lr_context_pin(request->ring, request->ctx);
648 request->ringbuf = request->ctx->engine[request->ring->id].ringbuf;
653 static int logical_ring_wait_for_space(struct drm_i915_gem_request *req,
656 struct intel_ringbuffer *ringbuf = req->ringbuf;
657 struct intel_engine_cs *ring = req->ring;
658 struct drm_i915_gem_request *target;
662 if (intel_ring_space(ringbuf) >= bytes)
665 /* The whole point of reserving space is to not wait! */
666 WARN_ON(ringbuf->reserved_in_use);
668 list_for_each_entry(target, &ring->request_list, list) {
670 * The request queue is per-engine, so can contain requests
671 * from multiple ringbuffers. Here, we must ignore any that
672 * aren't from the ringbuffer we're considering.
674 if (target->ringbuf != ringbuf)
677 /* Would completion of this request free enough space? */
678 space = __intel_ring_space(target->postfix, ringbuf->tail,
684 if (WARN_ON(&target->list == &ring->request_list))
687 ret = i915_wait_request(target);
691 ringbuf->space = space;
696 * intel_logical_ring_advance_and_submit() - advance the tail and submit the workload
697 * @request: Request to advance the logical ringbuffer of.
699 * The tail is updated in our logical ringbuffer struct, not in the actual context. What
700 * really happens during submission is that the context and current tail will be placed
701 * on a queue waiting for the ELSP to be ready to accept a new context submission. At that
702 * point, the tail *inside* the context is updated and the ELSP written to.
705 intel_logical_ring_advance_and_submit(struct drm_i915_gem_request *request)
707 struct intel_engine_cs *ring = request->ring;
709 intel_logical_ring_advance(request->ringbuf);
711 if (intel_ring_stopped(ring))
714 execlists_context_queue(request);
717 static void __wrap_ring_buffer(struct intel_ringbuffer *ringbuf)
719 uint32_t __iomem *virt;
720 int rem = ringbuf->size - ringbuf->tail;
722 virt = ringbuf->virtual_start + ringbuf->tail;
725 iowrite32(MI_NOOP, virt++);
728 intel_ring_update_space(ringbuf);
731 static int logical_ring_prepare(struct drm_i915_gem_request *req, int bytes)
733 struct intel_ringbuffer *ringbuf = req->ringbuf;
734 int remain_usable = ringbuf->effective_size - ringbuf->tail;
735 int remain_actual = ringbuf->size - ringbuf->tail;
736 int ret, total_bytes, wait_bytes = 0;
737 bool need_wrap = false;
739 if (ringbuf->reserved_in_use)
742 total_bytes = bytes + ringbuf->reserved_size;
744 if (unlikely(bytes > remain_usable)) {
746 * Not enough space for the basic request. So need to flush
747 * out the remainder and then wait for base + reserved.
749 wait_bytes = remain_actual + total_bytes;
752 if (unlikely(total_bytes > remain_usable)) {
754 * The base request will fit but the reserved space
755 * falls off the end. So only need to to wait for the
756 * reserved size after flushing out the remainder.
758 wait_bytes = remain_actual + ringbuf->reserved_size;
760 } else if (total_bytes > ringbuf->space) {
761 /* No wrapping required, just waiting. */
762 wait_bytes = total_bytes;
767 ret = logical_ring_wait_for_space(req, wait_bytes);
772 __wrap_ring_buffer(ringbuf);
779 * intel_logical_ring_begin() - prepare the logical ringbuffer to accept some commands
781 * @request: The request to start some new work for
782 * @ctx: Logical ring context whose ringbuffer is being prepared.
783 * @num_dwords: number of DWORDs that we plan to write to the ringbuffer.
785 * The ringbuffer might not be ready to accept the commands right away (maybe it needs to
786 * be wrapped, or wait a bit for the tail to be updated). This function takes care of that
787 * and also preallocates a request (every workload submission is still mediated through
788 * requests, same as it did with legacy ringbuffer submission).
790 * Return: non-zero if the ringbuffer is not ready to be written to.
792 static int intel_logical_ring_begin(struct drm_i915_gem_request *req,
795 struct drm_i915_private *dev_priv;
798 WARN_ON(req == NULL);
799 dev_priv = req->ring->dev->dev_private;
801 ret = i915_gem_check_wedge(&dev_priv->gpu_error,
802 dev_priv->mm.interruptible);
806 ret = logical_ring_prepare(req, num_dwords * sizeof(uint32_t));
810 req->ringbuf->space -= num_dwords * sizeof(uint32_t);
814 int intel_logical_ring_reserve_space(struct drm_i915_gem_request *request)
817 * The first call merely notes the reserve request and is common for
818 * all back ends. The subsequent localised _begin() call actually
819 * ensures that the reservation is available. Without the begin, if
820 * the request creator immediately submitted the request without
821 * adding any commands to it then there might not actually be
822 * sufficient room for the submission commands.
824 intel_ring_reserved_space_reserve(request->ringbuf, MIN_SPACE_FOR_ADD_REQUEST);
826 return intel_logical_ring_begin(request, 0);
830 * execlists_submission() - submit a batchbuffer for execution, Execlists style
833 * @ring: Engine Command Streamer to submit to.
834 * @ctx: Context to employ for this submission.
835 * @args: execbuffer call arguments.
836 * @vmas: list of vmas.
837 * @batch_obj: the batchbuffer to submit.
838 * @exec_start: batchbuffer start virtual address pointer.
839 * @dispatch_flags: translated execbuffer call flags.
841 * This is the evil twin version of i915_gem_ringbuffer_submission. It abstracts
842 * away the submission details of the execbuffer ioctl call.
844 * Return: non-zero if the submission fails.
846 int intel_execlists_submission(struct i915_execbuffer_params *params,
847 struct drm_i915_gem_execbuffer2 *args,
848 struct list_head *vmas)
850 struct drm_device *dev = params->dev;
851 struct intel_engine_cs *ring = params->ring;
852 struct drm_i915_private *dev_priv = dev->dev_private;
853 struct intel_ringbuffer *ringbuf = params->ctx->engine[ring->id].ringbuf;
859 instp_mode = args->flags & I915_EXEC_CONSTANTS_MASK;
860 instp_mask = I915_EXEC_CONSTANTS_MASK;
861 switch (instp_mode) {
862 case I915_EXEC_CONSTANTS_REL_GENERAL:
863 case I915_EXEC_CONSTANTS_ABSOLUTE:
864 case I915_EXEC_CONSTANTS_REL_SURFACE:
865 if (instp_mode != 0 && ring != &dev_priv->ring[RCS]) {
866 DRM_DEBUG("non-0 rel constants mode on non-RCS\n");
870 if (instp_mode != dev_priv->relative_constants_mode) {
871 if (instp_mode == I915_EXEC_CONSTANTS_REL_SURFACE) {
872 DRM_DEBUG("rel surface constants mode invalid on gen5+\n");
876 /* The HW changed the meaning on this bit on gen6 */
877 instp_mask &= ~I915_EXEC_CONSTANTS_REL_SURFACE;
881 DRM_DEBUG("execbuf with unknown constants: %d\n", instp_mode);
885 if (args->num_cliprects != 0) {
886 DRM_DEBUG("clip rectangles are only valid on pre-gen5\n");
889 if (args->DR4 == 0xffffffff) {
890 DRM_DEBUG("UXA submitting garbage DR4, fixing up\n");
894 if (args->DR1 || args->DR4 || args->cliprects_ptr) {
895 DRM_DEBUG("0 cliprects but dirt in cliprects fields\n");
900 if (args->flags & I915_EXEC_GEN7_SOL_RESET) {
901 DRM_DEBUG("sol reset is gen7 only\n");
905 ret = execlists_move_to_gpu(params->request, vmas);
909 if (ring == &dev_priv->ring[RCS] &&
910 instp_mode != dev_priv->relative_constants_mode) {
911 ret = intel_logical_ring_begin(params->request, 4);
915 intel_logical_ring_emit(ringbuf, MI_NOOP);
916 intel_logical_ring_emit(ringbuf, MI_LOAD_REGISTER_IMM(1));
917 intel_logical_ring_emit(ringbuf, INSTPM);
918 intel_logical_ring_emit(ringbuf, instp_mask << 16 | instp_mode);
919 intel_logical_ring_advance(ringbuf);
921 dev_priv->relative_constants_mode = instp_mode;
924 exec_start = params->batch_obj_vm_offset +
925 args->batch_start_offset;
927 ret = ring->emit_bb_start(params->request, exec_start, params->dispatch_flags);
931 trace_i915_gem_ring_dispatch(params->request, params->dispatch_flags);
933 i915_gem_execbuffer_move_to_active(vmas, params->request);
934 i915_gem_execbuffer_retire_commands(params);
939 void intel_execlists_retire_requests(struct intel_engine_cs *ring)
941 struct drm_i915_gem_request *req, *tmp;
942 struct list_head retired_list;
944 WARN_ON(!mutex_is_locked(&ring->dev->struct_mutex));
945 if (list_empty(&ring->execlist_retired_req_list))
948 INIT_LIST_HEAD(&retired_list);
949 spin_lock_irq(&ring->execlist_lock);
950 list_replace_init(&ring->execlist_retired_req_list, &retired_list);
951 spin_unlock_irq(&ring->execlist_lock);
953 list_for_each_entry_safe(req, tmp, &retired_list, execlist_link) {
954 struct intel_context *ctx = req->ctx;
955 struct drm_i915_gem_object *ctx_obj =
956 ctx->engine[ring->id].state;
958 if (ctx_obj && (ctx != ring->default_context))
959 intel_lr_context_unpin(ring, ctx);
960 list_del(&req->execlist_link);
961 i915_gem_request_unreference(req);
965 void intel_logical_ring_stop(struct intel_engine_cs *ring)
967 struct drm_i915_private *dev_priv = ring->dev->dev_private;
970 if (!intel_ring_initialized(ring))
973 ret = intel_ring_idle(ring);
974 if (ret && !i915_reset_in_progress(&to_i915(ring->dev)->gpu_error))
975 DRM_ERROR("failed to quiesce %s whilst cleaning up: %d\n",
978 /* TODO: Is this correct with Execlists enabled? */
979 I915_WRITE_MODE(ring, _MASKED_BIT_ENABLE(STOP_RING));
980 if (wait_for_atomic((I915_READ_MODE(ring) & MODE_IDLE) != 0, 1000)) {
981 DRM_ERROR("%s :timed out trying to stop ring\n", ring->name);
984 I915_WRITE_MODE(ring, _MASKED_BIT_DISABLE(STOP_RING));
987 int logical_ring_flush_all_caches(struct drm_i915_gem_request *req)
989 struct intel_engine_cs *ring = req->ring;
992 if (!ring->gpu_caches_dirty)
995 ret = ring->emit_flush(req, 0, I915_GEM_GPU_DOMAINS);
999 ring->gpu_caches_dirty = false;
1003 static int intel_lr_context_pin(struct intel_engine_cs *ring,
1004 struct intel_context *ctx)
1006 struct drm_i915_gem_object *ctx_obj = ctx->engine[ring->id].state;
1007 struct intel_ringbuffer *ringbuf = ctx->engine[ring->id].ringbuf;
1010 WARN_ON(!mutex_is_locked(&ring->dev->struct_mutex));
1011 if (ctx->engine[ring->id].pin_count++ == 0) {
1012 ret = i915_gem_obj_ggtt_pin(ctx_obj,
1013 GEN8_LR_CONTEXT_ALIGN, 0);
1015 goto reset_pin_count;
1017 ret = intel_pin_and_map_ringbuffer_obj(ring->dev, ringbuf);
1025 i915_gem_object_ggtt_unpin(ctx_obj);
1027 ctx->engine[ring->id].pin_count = 0;
1032 void intel_lr_context_unpin(struct intel_engine_cs *ring,
1033 struct intel_context *ctx)
1035 struct drm_i915_gem_object *ctx_obj = ctx->engine[ring->id].state;
1036 struct intel_ringbuffer *ringbuf = ctx->engine[ring->id].ringbuf;
1039 WARN_ON(!mutex_is_locked(&ring->dev->struct_mutex));
1040 if (--ctx->engine[ring->id].pin_count == 0) {
1041 intel_unpin_ringbuffer_obj(ringbuf);
1042 i915_gem_object_ggtt_unpin(ctx_obj);
1047 static int intel_logical_ring_workarounds_emit(struct drm_i915_gem_request *req)
1050 struct intel_engine_cs *ring = req->ring;
1051 struct intel_ringbuffer *ringbuf = req->ringbuf;
1052 struct drm_device *dev = ring->dev;
1053 struct drm_i915_private *dev_priv = dev->dev_private;
1054 struct i915_workarounds *w = &dev_priv->workarounds;
1056 if (WARN_ON_ONCE(w->count == 0))
1059 ring->gpu_caches_dirty = true;
1060 ret = logical_ring_flush_all_caches(req);
1064 ret = intel_logical_ring_begin(req, w->count * 2 + 2);
1068 intel_logical_ring_emit(ringbuf, MI_LOAD_REGISTER_IMM(w->count));
1069 for (i = 0; i < w->count; i++) {
1070 intel_logical_ring_emit(ringbuf, w->reg[i].addr);
1071 intel_logical_ring_emit(ringbuf, w->reg[i].value);
1073 intel_logical_ring_emit(ringbuf, MI_NOOP);
1075 intel_logical_ring_advance(ringbuf);
1077 ring->gpu_caches_dirty = true;
1078 ret = logical_ring_flush_all_caches(req);
1085 #define wa_ctx_emit(batch, cmd) \
1087 if (WARN_ON(index >= (PAGE_SIZE / sizeof(uint32_t)))) { \
1090 batch[index++] = (cmd); \
1095 * In this WA we need to set GEN8_L3SQCREG4[21:21] and reset it after
1096 * PIPE_CONTROL instruction. This is required for the flush to happen correctly
1097 * but there is a slight complication as this is applied in WA batch where the
1098 * values are only initialized once so we cannot take register value at the
1099 * beginning and reuse it further; hence we save its value to memory, upload a
1100 * constant value with bit21 set and then we restore it back with the saved value.
1101 * To simplify the WA, a constant value is formed by using the default value
1102 * of this register. This shouldn't be a problem because we are only modifying
1103 * it for a short period and this batch in non-premptible. We can ofcourse
1104 * use additional instructions that read the actual value of the register
1105 * at that time and set our bit of interest but it makes the WA complicated.
1107 * This WA is also required for Gen9 so extracting as a function avoids
1110 static inline int gen8_emit_flush_coherentl3_wa(struct intel_engine_cs *ring,
1111 uint32_t *const batch,
1114 uint32_t l3sqc4_flush = (0x40400000 | GEN8_LQSC_FLUSH_COHERENT_LINES);
1116 wa_ctx_emit(batch, (MI_STORE_REGISTER_MEM_GEN8(1) |
1117 MI_SRM_LRM_GLOBAL_GTT));
1118 wa_ctx_emit(batch, GEN8_L3SQCREG4);
1119 wa_ctx_emit(batch, ring->scratch.gtt_offset + 256);
1120 wa_ctx_emit(batch, 0);
1122 wa_ctx_emit(batch, MI_LOAD_REGISTER_IMM(1));
1123 wa_ctx_emit(batch, GEN8_L3SQCREG4);
1124 wa_ctx_emit(batch, l3sqc4_flush);
1126 wa_ctx_emit(batch, GFX_OP_PIPE_CONTROL(6));
1127 wa_ctx_emit(batch, (PIPE_CONTROL_CS_STALL |
1128 PIPE_CONTROL_DC_FLUSH_ENABLE));
1129 wa_ctx_emit(batch, 0);
1130 wa_ctx_emit(batch, 0);
1131 wa_ctx_emit(batch, 0);
1132 wa_ctx_emit(batch, 0);
1134 wa_ctx_emit(batch, (MI_LOAD_REGISTER_MEM_GEN8(1) |
1135 MI_SRM_LRM_GLOBAL_GTT));
1136 wa_ctx_emit(batch, GEN8_L3SQCREG4);
1137 wa_ctx_emit(batch, ring->scratch.gtt_offset + 256);
1138 wa_ctx_emit(batch, 0);
1143 static inline uint32_t wa_ctx_start(struct i915_wa_ctx_bb *wa_ctx,
1145 uint32_t start_alignment)
1147 return wa_ctx->offset = ALIGN(offset, start_alignment);
1150 static inline int wa_ctx_end(struct i915_wa_ctx_bb *wa_ctx,
1152 uint32_t size_alignment)
1154 wa_ctx->size = offset - wa_ctx->offset;
1156 WARN(wa_ctx->size % size_alignment,
1157 "wa_ctx_bb failed sanity checks: size %d is not aligned to %d\n",
1158 wa_ctx->size, size_alignment);
1163 * gen8_init_indirectctx_bb() - initialize indirect ctx batch with WA
1165 * @ring: only applicable for RCS
1166 * @wa_ctx: structure representing wa_ctx
1167 * offset: specifies start of the batch, should be cache-aligned. This is updated
1168 * with the offset value received as input.
1169 * size: size of the batch in DWORDS but HW expects in terms of cachelines
1170 * @batch: page in which WA are loaded
1171 * @offset: This field specifies the start of the batch, it should be
1172 * cache-aligned otherwise it is adjusted accordingly.
1173 * Typically we only have one indirect_ctx and per_ctx batch buffer which are
1174 * initialized at the beginning and shared across all contexts but this field
1175 * helps us to have multiple batches at different offsets and select them based
1176 * on a criteria. At the moment this batch always start at the beginning of the page
1177 * and at this point we don't have multiple wa_ctx batch buffers.
1179 * The number of WA applied are not known at the beginning; we use this field
1180 * to return the no of DWORDS written.
1182 * It is to be noted that this batch does not contain MI_BATCH_BUFFER_END
1183 * so it adds NOOPs as padding to make it cacheline aligned.
1184 * MI_BATCH_BUFFER_END will be added to perctx batch and both of them together
1185 * makes a complete batch buffer.
1187 * Return: non-zero if we exceed the PAGE_SIZE limit.
1190 static int gen8_init_indirectctx_bb(struct intel_engine_cs *ring,
1191 struct i915_wa_ctx_bb *wa_ctx,
1192 uint32_t *const batch,
1195 uint32_t scratch_addr;
1196 uint32_t index = wa_ctx_start(wa_ctx, *offset, CACHELINE_DWORDS);
1198 /* WaDisableCtxRestoreArbitration:bdw,chv */
1199 wa_ctx_emit(batch, MI_ARB_ON_OFF | MI_ARB_DISABLE);
1201 /* WaFlushCoherentL3CacheLinesAtContextSwitch:bdw */
1202 if (IS_BROADWELL(ring->dev)) {
1203 index = gen8_emit_flush_coherentl3_wa(ring, batch, index);
1208 /* WaClearSlmSpaceAtContextSwitch:bdw,chv */
1209 /* Actual scratch location is at 128 bytes offset */
1210 scratch_addr = ring->scratch.gtt_offset + 2*CACHELINE_BYTES;
1212 wa_ctx_emit(batch, GFX_OP_PIPE_CONTROL(6));
1213 wa_ctx_emit(batch, (PIPE_CONTROL_FLUSH_L3 |
1214 PIPE_CONTROL_GLOBAL_GTT_IVB |
1215 PIPE_CONTROL_CS_STALL |
1216 PIPE_CONTROL_QW_WRITE));
1217 wa_ctx_emit(batch, scratch_addr);
1218 wa_ctx_emit(batch, 0);
1219 wa_ctx_emit(batch, 0);
1220 wa_ctx_emit(batch, 0);
1222 /* Pad to end of cacheline */
1223 while (index % CACHELINE_DWORDS)
1224 wa_ctx_emit(batch, MI_NOOP);
1227 * MI_BATCH_BUFFER_END is not required in Indirect ctx BB because
1228 * execution depends on the length specified in terms of cache lines
1229 * in the register CTX_RCS_INDIRECT_CTX
1232 return wa_ctx_end(wa_ctx, *offset = index, CACHELINE_DWORDS);
1236 * gen8_init_perctx_bb() - initialize per ctx batch with WA
1238 * @ring: only applicable for RCS
1239 * @wa_ctx: structure representing wa_ctx
1240 * offset: specifies start of the batch, should be cache-aligned.
1241 * size: size of the batch in DWORDS but HW expects in terms of cachelines
1242 * @batch: page in which WA are loaded
1243 * @offset: This field specifies the start of this batch.
1244 * This batch is started immediately after indirect_ctx batch. Since we ensure
1245 * that indirect_ctx ends on a cacheline this batch is aligned automatically.
1247 * The number of DWORDS written are returned using this field.
1249 * This batch is terminated with MI_BATCH_BUFFER_END and so we need not add padding
1250 * to align it with cacheline as padding after MI_BATCH_BUFFER_END is redundant.
1252 static int gen8_init_perctx_bb(struct intel_engine_cs *ring,
1253 struct i915_wa_ctx_bb *wa_ctx,
1254 uint32_t *const batch,
1257 uint32_t index = wa_ctx_start(wa_ctx, *offset, CACHELINE_DWORDS);
1259 /* WaDisableCtxRestoreArbitration:bdw,chv */
1260 wa_ctx_emit(batch, MI_ARB_ON_OFF | MI_ARB_ENABLE);
1262 wa_ctx_emit(batch, MI_BATCH_BUFFER_END);
1264 return wa_ctx_end(wa_ctx, *offset = index, 1);
1267 static int lrc_setup_wa_ctx_obj(struct intel_engine_cs *ring, u32 size)
1271 ring->wa_ctx.obj = i915_gem_alloc_object(ring->dev, PAGE_ALIGN(size));
1272 if (!ring->wa_ctx.obj) {
1273 DRM_DEBUG_DRIVER("alloc LRC WA ctx backing obj failed.\n");
1277 ret = i915_gem_obj_ggtt_pin(ring->wa_ctx.obj, PAGE_SIZE, 0);
1279 DRM_DEBUG_DRIVER("pin LRC WA ctx backing obj failed: %d\n",
1281 drm_gem_object_unreference(&ring->wa_ctx.obj->base);
1288 static void lrc_destroy_wa_ctx_obj(struct intel_engine_cs *ring)
1290 if (ring->wa_ctx.obj) {
1291 i915_gem_object_ggtt_unpin(ring->wa_ctx.obj);
1292 drm_gem_object_unreference(&ring->wa_ctx.obj->base);
1293 ring->wa_ctx.obj = NULL;
1297 static int intel_init_workaround_bb(struct intel_engine_cs *ring)
1303 struct i915_ctx_workarounds *wa_ctx = &ring->wa_ctx;
1305 WARN_ON(ring->id != RCS);
1307 /* update this when WA for higher Gen are added */
1308 if (WARN(INTEL_INFO(ring->dev)->gen > 8,
1309 "WA batch buffer is not initialized for Gen%d\n",
1310 INTEL_INFO(ring->dev)->gen))
1313 /* some WA perform writes to scratch page, ensure it is valid */
1314 if (ring->scratch.obj == NULL) {
1315 DRM_ERROR("scratch page not allocated for %s\n", ring->name);
1319 ret = lrc_setup_wa_ctx_obj(ring, PAGE_SIZE);
1321 DRM_DEBUG_DRIVER("Failed to setup context WA page: %d\n", ret);
1325 page = i915_gem_object_get_page(wa_ctx->obj, 0);
1326 batch = kmap_atomic(page);
1329 if (INTEL_INFO(ring->dev)->gen == 8) {
1330 ret = gen8_init_indirectctx_bb(ring,
1331 &wa_ctx->indirect_ctx,
1337 ret = gen8_init_perctx_bb(ring,
1346 kunmap_atomic(batch);
1348 lrc_destroy_wa_ctx_obj(ring);
1353 static int gen8_init_common_ring(struct intel_engine_cs *ring)
1355 struct drm_device *dev = ring->dev;
1356 struct drm_i915_private *dev_priv = dev->dev_private;
1358 I915_WRITE_IMR(ring, ~(ring->irq_enable_mask | ring->irq_keep_mask));
1359 I915_WRITE(RING_HWSTAM(ring->mmio_base), 0xffffffff);
1361 I915_WRITE(RING_MODE_GEN7(ring),
1362 _MASKED_BIT_DISABLE(GFX_REPLAY_MODE) |
1363 _MASKED_BIT_ENABLE(GFX_RUN_LIST_ENABLE));
1364 POSTING_READ(RING_MODE_GEN7(ring));
1365 ring->next_context_status_buffer = 0;
1366 DRM_DEBUG_DRIVER("Execlists enabled for %s\n", ring->name);
1368 memset(&ring->hangcheck, 0, sizeof(ring->hangcheck));
1373 static int gen8_init_render_ring(struct intel_engine_cs *ring)
1375 struct drm_device *dev = ring->dev;
1376 struct drm_i915_private *dev_priv = dev->dev_private;
1379 ret = gen8_init_common_ring(ring);
1383 /* We need to disable the AsyncFlip performance optimisations in order
1384 * to use MI_WAIT_FOR_EVENT within the CS. It should already be
1385 * programmed to '1' on all products.
1387 * WaDisableAsyncFlipPerfMode:snb,ivb,hsw,vlv,bdw,chv
1389 I915_WRITE(MI_MODE, _MASKED_BIT_ENABLE(ASYNC_FLIP_PERF_DISABLE));
1391 I915_WRITE(INSTPM, _MASKED_BIT_ENABLE(INSTPM_FORCE_ORDERING));
1393 return init_workarounds_ring(ring);
1396 static int gen9_init_render_ring(struct intel_engine_cs *ring)
1400 ret = gen8_init_common_ring(ring);
1404 return init_workarounds_ring(ring);
1407 static int intel_logical_ring_emit_pdps(struct drm_i915_gem_request *req)
1409 struct i915_hw_ppgtt *ppgtt = req->ctx->ppgtt;
1410 struct intel_engine_cs *ring = req->ring;
1411 struct intel_ringbuffer *ringbuf = req->ringbuf;
1412 const int num_lri_cmds = GEN8_LEGACY_PDPES * 2;
1415 ret = intel_logical_ring_begin(req, num_lri_cmds * 2 + 2);
1419 intel_logical_ring_emit(ringbuf, MI_LOAD_REGISTER_IMM(num_lri_cmds));
1420 for (i = GEN8_LEGACY_PDPES - 1; i >= 0; i--) {
1421 const dma_addr_t pd_daddr = i915_page_dir_dma_addr(ppgtt, i);
1423 intel_logical_ring_emit(ringbuf, GEN8_RING_PDP_UDW(ring, i));
1424 intel_logical_ring_emit(ringbuf, upper_32_bits(pd_daddr));
1425 intel_logical_ring_emit(ringbuf, GEN8_RING_PDP_LDW(ring, i));
1426 intel_logical_ring_emit(ringbuf, lower_32_bits(pd_daddr));
1429 intel_logical_ring_emit(ringbuf, MI_NOOP);
1430 intel_logical_ring_advance(ringbuf);
1435 static int gen8_emit_bb_start(struct drm_i915_gem_request *req,
1436 u64 offset, unsigned dispatch_flags)
1438 struct intel_ringbuffer *ringbuf = req->ringbuf;
1439 bool ppgtt = !(dispatch_flags & I915_DISPATCH_SECURE);
1442 /* Don't rely in hw updating PDPs, specially in lite-restore.
1443 * Ideally, we should set Force PD Restore in ctx descriptor,
1444 * but we can't. Force Restore would be a second option, but
1445 * it is unsafe in case of lite-restore (because the ctx is
1447 if (req->ctx->ppgtt &&
1448 (intel_ring_flag(req->ring) & req->ctx->ppgtt->pd_dirty_rings)) {
1449 ret = intel_logical_ring_emit_pdps(req);
1453 req->ctx->ppgtt->pd_dirty_rings &= ~intel_ring_flag(req->ring);
1456 ret = intel_logical_ring_begin(req, 4);
1460 /* FIXME(BDW): Address space and security selectors. */
1461 intel_logical_ring_emit(ringbuf, MI_BATCH_BUFFER_START_GEN8 |
1463 (dispatch_flags & I915_DISPATCH_RS ?
1464 MI_BATCH_RESOURCE_STREAMER : 0));
1465 intel_logical_ring_emit(ringbuf, lower_32_bits(offset));
1466 intel_logical_ring_emit(ringbuf, upper_32_bits(offset));
1467 intel_logical_ring_emit(ringbuf, MI_NOOP);
1468 intel_logical_ring_advance(ringbuf);
1473 static bool gen8_logical_ring_get_irq(struct intel_engine_cs *ring)
1475 struct drm_device *dev = ring->dev;
1476 struct drm_i915_private *dev_priv = dev->dev_private;
1477 unsigned long flags;
1479 if (WARN_ON(!intel_irqs_enabled(dev_priv)))
1482 spin_lock_irqsave(&dev_priv->irq_lock, flags);
1483 if (ring->irq_refcount++ == 0) {
1484 I915_WRITE_IMR(ring, ~(ring->irq_enable_mask | ring->irq_keep_mask));
1485 POSTING_READ(RING_IMR(ring->mmio_base));
1487 spin_unlock_irqrestore(&dev_priv->irq_lock, flags);
1492 static void gen8_logical_ring_put_irq(struct intel_engine_cs *ring)
1494 struct drm_device *dev = ring->dev;
1495 struct drm_i915_private *dev_priv = dev->dev_private;
1496 unsigned long flags;
1498 spin_lock_irqsave(&dev_priv->irq_lock, flags);
1499 if (--ring->irq_refcount == 0) {
1500 I915_WRITE_IMR(ring, ~ring->irq_keep_mask);
1501 POSTING_READ(RING_IMR(ring->mmio_base));
1503 spin_unlock_irqrestore(&dev_priv->irq_lock, flags);
1506 static int gen8_emit_flush(struct drm_i915_gem_request *request,
1507 u32 invalidate_domains,
1510 struct intel_ringbuffer *ringbuf = request->ringbuf;
1511 struct intel_engine_cs *ring = ringbuf->ring;
1512 struct drm_device *dev = ring->dev;
1513 struct drm_i915_private *dev_priv = dev->dev_private;
1517 ret = intel_logical_ring_begin(request, 4);
1521 cmd = MI_FLUSH_DW + 1;
1523 /* We always require a command barrier so that subsequent
1524 * commands, such as breadcrumb interrupts, are strictly ordered
1525 * wrt the contents of the write cache being flushed to memory
1526 * (and thus being coherent from the CPU).
1528 cmd |= MI_FLUSH_DW_STORE_INDEX | MI_FLUSH_DW_OP_STOREDW;
1530 if (invalidate_domains & I915_GEM_GPU_DOMAINS) {
1531 cmd |= MI_INVALIDATE_TLB;
1532 if (ring == &dev_priv->ring[VCS])
1533 cmd |= MI_INVALIDATE_BSD;
1536 intel_logical_ring_emit(ringbuf, cmd);
1537 intel_logical_ring_emit(ringbuf,
1538 I915_GEM_HWS_SCRATCH_ADDR |
1539 MI_FLUSH_DW_USE_GTT);
1540 intel_logical_ring_emit(ringbuf, 0); /* upper addr */
1541 intel_logical_ring_emit(ringbuf, 0); /* value */
1542 intel_logical_ring_advance(ringbuf);
1547 static int gen8_emit_flush_render(struct drm_i915_gem_request *request,
1548 u32 invalidate_domains,
1551 struct intel_ringbuffer *ringbuf = request->ringbuf;
1552 struct intel_engine_cs *ring = ringbuf->ring;
1553 u32 scratch_addr = ring->scratch.gtt_offset + 2 * CACHELINE_BYTES;
1558 flags |= PIPE_CONTROL_CS_STALL;
1560 if (flush_domains) {
1561 flags |= PIPE_CONTROL_RENDER_TARGET_CACHE_FLUSH;
1562 flags |= PIPE_CONTROL_DEPTH_CACHE_FLUSH;
1565 if (invalidate_domains) {
1566 flags |= PIPE_CONTROL_TLB_INVALIDATE;
1567 flags |= PIPE_CONTROL_INSTRUCTION_CACHE_INVALIDATE;
1568 flags |= PIPE_CONTROL_TEXTURE_CACHE_INVALIDATE;
1569 flags |= PIPE_CONTROL_VF_CACHE_INVALIDATE;
1570 flags |= PIPE_CONTROL_CONST_CACHE_INVALIDATE;
1571 flags |= PIPE_CONTROL_STATE_CACHE_INVALIDATE;
1572 flags |= PIPE_CONTROL_QW_WRITE;
1573 flags |= PIPE_CONTROL_GLOBAL_GTT_IVB;
1577 * On GEN9+ Before VF_CACHE_INVALIDATE we need to emit a NULL pipe
1580 vf_flush_wa = INTEL_INFO(ring->dev)->gen >= 9 &&
1581 flags & PIPE_CONTROL_VF_CACHE_INVALIDATE;
1583 ret = intel_logical_ring_begin(request, vf_flush_wa ? 12 : 6);
1588 intel_logical_ring_emit(ringbuf, GFX_OP_PIPE_CONTROL(6));
1589 intel_logical_ring_emit(ringbuf, 0);
1590 intel_logical_ring_emit(ringbuf, 0);
1591 intel_logical_ring_emit(ringbuf, 0);
1592 intel_logical_ring_emit(ringbuf, 0);
1593 intel_logical_ring_emit(ringbuf, 0);
1596 intel_logical_ring_emit(ringbuf, GFX_OP_PIPE_CONTROL(6));
1597 intel_logical_ring_emit(ringbuf, flags);
1598 intel_logical_ring_emit(ringbuf, scratch_addr);
1599 intel_logical_ring_emit(ringbuf, 0);
1600 intel_logical_ring_emit(ringbuf, 0);
1601 intel_logical_ring_emit(ringbuf, 0);
1602 intel_logical_ring_advance(ringbuf);
1607 static u32 gen8_get_seqno(struct intel_engine_cs *ring, bool lazy_coherency)
1609 return intel_read_status_page(ring, I915_GEM_HWS_INDEX);
1612 static void gen8_set_seqno(struct intel_engine_cs *ring, u32 seqno)
1614 intel_write_status_page(ring, I915_GEM_HWS_INDEX, seqno);
1617 static int gen8_emit_request(struct drm_i915_gem_request *request)
1619 struct intel_ringbuffer *ringbuf = request->ringbuf;
1620 struct intel_engine_cs *ring = ringbuf->ring;
1625 * Reserve space for 2 NOOPs at the end of each request to be
1626 * used as a workaround for not being allowed to do lite
1627 * restore with HEAD==TAIL (WaIdleLiteRestore).
1629 ret = intel_logical_ring_begin(request, 8);
1633 cmd = MI_STORE_DWORD_IMM_GEN4;
1634 cmd |= MI_GLOBAL_GTT;
1636 intel_logical_ring_emit(ringbuf, cmd);
1637 intel_logical_ring_emit(ringbuf,
1638 (ring->status_page.gfx_addr +
1639 (I915_GEM_HWS_INDEX << MI_STORE_DWORD_INDEX_SHIFT)));
1640 intel_logical_ring_emit(ringbuf, 0);
1641 intel_logical_ring_emit(ringbuf, i915_gem_request_get_seqno(request));
1642 intel_logical_ring_emit(ringbuf, MI_USER_INTERRUPT);
1643 intel_logical_ring_emit(ringbuf, MI_NOOP);
1644 intel_logical_ring_advance_and_submit(request);
1647 * Here we add two extra NOOPs as padding to avoid
1648 * lite restore of a context with HEAD==TAIL.
1650 intel_logical_ring_emit(ringbuf, MI_NOOP);
1651 intel_logical_ring_emit(ringbuf, MI_NOOP);
1652 intel_logical_ring_advance(ringbuf);
1657 static int intel_lr_context_render_state_init(struct drm_i915_gem_request *req)
1659 struct render_state so;
1662 ret = i915_gem_render_state_prepare(req->ring, &so);
1666 if (so.rodata == NULL)
1669 ret = req->ring->emit_bb_start(req, so.ggtt_offset,
1670 I915_DISPATCH_SECURE);
1674 i915_vma_move_to_active(i915_gem_obj_to_ggtt(so.obj), req);
1677 i915_gem_render_state_fini(&so);
1681 static int gen8_init_rcs_context(struct drm_i915_gem_request *req)
1685 ret = intel_logical_ring_workarounds_emit(req);
1689 return intel_lr_context_render_state_init(req);
1693 * intel_logical_ring_cleanup() - deallocate the Engine Command Streamer
1695 * @ring: Engine Command Streamer.
1698 void intel_logical_ring_cleanup(struct intel_engine_cs *ring)
1700 struct drm_i915_private *dev_priv;
1702 if (!intel_ring_initialized(ring))
1705 dev_priv = ring->dev->dev_private;
1707 intel_logical_ring_stop(ring);
1708 WARN_ON((I915_READ_MODE(ring) & MODE_IDLE) == 0);
1711 ring->cleanup(ring);
1713 i915_cmd_parser_fini_ring(ring);
1714 i915_gem_batch_pool_fini(&ring->batch_pool);
1716 if (ring->status_page.obj) {
1717 kunmap(sg_page(ring->status_page.obj->pages->sgl));
1718 ring->status_page.obj = NULL;
1721 lrc_destroy_wa_ctx_obj(ring);
1724 static int logical_ring_init(struct drm_device *dev, struct intel_engine_cs *ring)
1728 /* Intentionally left blank. */
1729 ring->buffer = NULL;
1732 INIT_LIST_HEAD(&ring->active_list);
1733 INIT_LIST_HEAD(&ring->request_list);
1734 i915_gem_batch_pool_init(dev, &ring->batch_pool);
1735 init_waitqueue_head(&ring->irq_queue);
1737 INIT_LIST_HEAD(&ring->execlist_queue);
1738 INIT_LIST_HEAD(&ring->execlist_retired_req_list);
1739 spin_lock_init(&ring->execlist_lock);
1741 ret = i915_cmd_parser_init_ring(ring);
1745 ret = intel_lr_context_deferred_create(ring->default_context, ring);
1750 static int logical_render_ring_init(struct drm_device *dev)
1752 struct drm_i915_private *dev_priv = dev->dev_private;
1753 struct intel_engine_cs *ring = &dev_priv->ring[RCS];
1756 ring->name = "render ring";
1758 ring->mmio_base = RENDER_RING_BASE;
1759 ring->irq_enable_mask =
1760 GT_RENDER_USER_INTERRUPT << GEN8_RCS_IRQ_SHIFT;
1761 ring->irq_keep_mask =
1762 GT_CONTEXT_SWITCH_INTERRUPT << GEN8_RCS_IRQ_SHIFT;
1763 if (HAS_L3_DPF(dev))
1764 ring->irq_keep_mask |= GT_RENDER_L3_PARITY_ERROR_INTERRUPT;
1766 if (INTEL_INFO(dev)->gen >= 9)
1767 ring->init_hw = gen9_init_render_ring;
1769 ring->init_hw = gen8_init_render_ring;
1770 ring->init_context = gen8_init_rcs_context;
1771 ring->cleanup = intel_fini_pipe_control;
1772 ring->get_seqno = gen8_get_seqno;
1773 ring->set_seqno = gen8_set_seqno;
1774 ring->emit_request = gen8_emit_request;
1775 ring->emit_flush = gen8_emit_flush_render;
1776 ring->irq_get = gen8_logical_ring_get_irq;
1777 ring->irq_put = gen8_logical_ring_put_irq;
1778 ring->emit_bb_start = gen8_emit_bb_start;
1782 ret = intel_init_pipe_control(ring);
1786 ret = intel_init_workaround_bb(ring);
1789 * We continue even if we fail to initialize WA batch
1790 * because we only expect rare glitches but nothing
1791 * critical to prevent us from using GPU
1793 DRM_ERROR("WA batch buffer initialization failed: %d\n",
1797 ret = logical_ring_init(dev, ring);
1799 lrc_destroy_wa_ctx_obj(ring);
1805 static int logical_bsd_ring_init(struct drm_device *dev)
1807 struct drm_i915_private *dev_priv = dev->dev_private;
1808 struct intel_engine_cs *ring = &dev_priv->ring[VCS];
1810 ring->name = "bsd ring";
1812 ring->mmio_base = GEN6_BSD_RING_BASE;
1813 ring->irq_enable_mask =
1814 GT_RENDER_USER_INTERRUPT << GEN8_VCS1_IRQ_SHIFT;
1815 ring->irq_keep_mask =
1816 GT_CONTEXT_SWITCH_INTERRUPT << GEN8_VCS1_IRQ_SHIFT;
1818 ring->init_hw = gen8_init_common_ring;
1819 ring->get_seqno = gen8_get_seqno;
1820 ring->set_seqno = gen8_set_seqno;
1821 ring->emit_request = gen8_emit_request;
1822 ring->emit_flush = gen8_emit_flush;
1823 ring->irq_get = gen8_logical_ring_get_irq;
1824 ring->irq_put = gen8_logical_ring_put_irq;
1825 ring->emit_bb_start = gen8_emit_bb_start;
1827 return logical_ring_init(dev, ring);
1830 static int logical_bsd2_ring_init(struct drm_device *dev)
1832 struct drm_i915_private *dev_priv = dev->dev_private;
1833 struct intel_engine_cs *ring = &dev_priv->ring[VCS2];
1835 ring->name = "bds2 ring";
1837 ring->mmio_base = GEN8_BSD2_RING_BASE;
1838 ring->irq_enable_mask =
1839 GT_RENDER_USER_INTERRUPT << GEN8_VCS2_IRQ_SHIFT;
1840 ring->irq_keep_mask =
1841 GT_CONTEXT_SWITCH_INTERRUPT << GEN8_VCS2_IRQ_SHIFT;
1843 ring->init_hw = gen8_init_common_ring;
1844 ring->get_seqno = gen8_get_seqno;
1845 ring->set_seqno = gen8_set_seqno;
1846 ring->emit_request = gen8_emit_request;
1847 ring->emit_flush = gen8_emit_flush;
1848 ring->irq_get = gen8_logical_ring_get_irq;
1849 ring->irq_put = gen8_logical_ring_put_irq;
1850 ring->emit_bb_start = gen8_emit_bb_start;
1852 return logical_ring_init(dev, ring);
1855 static int logical_blt_ring_init(struct drm_device *dev)
1857 struct drm_i915_private *dev_priv = dev->dev_private;
1858 struct intel_engine_cs *ring = &dev_priv->ring[BCS];
1860 ring->name = "blitter ring";
1862 ring->mmio_base = BLT_RING_BASE;
1863 ring->irq_enable_mask =
1864 GT_RENDER_USER_INTERRUPT << GEN8_BCS_IRQ_SHIFT;
1865 ring->irq_keep_mask =
1866 GT_CONTEXT_SWITCH_INTERRUPT << GEN8_BCS_IRQ_SHIFT;
1868 ring->init_hw = gen8_init_common_ring;
1869 ring->get_seqno = gen8_get_seqno;
1870 ring->set_seqno = gen8_set_seqno;
1871 ring->emit_request = gen8_emit_request;
1872 ring->emit_flush = gen8_emit_flush;
1873 ring->irq_get = gen8_logical_ring_get_irq;
1874 ring->irq_put = gen8_logical_ring_put_irq;
1875 ring->emit_bb_start = gen8_emit_bb_start;
1877 return logical_ring_init(dev, ring);
1880 static int logical_vebox_ring_init(struct drm_device *dev)
1882 struct drm_i915_private *dev_priv = dev->dev_private;
1883 struct intel_engine_cs *ring = &dev_priv->ring[VECS];
1885 ring->name = "video enhancement ring";
1887 ring->mmio_base = VEBOX_RING_BASE;
1888 ring->irq_enable_mask =
1889 GT_RENDER_USER_INTERRUPT << GEN8_VECS_IRQ_SHIFT;
1890 ring->irq_keep_mask =
1891 GT_CONTEXT_SWITCH_INTERRUPT << GEN8_VECS_IRQ_SHIFT;
1893 ring->init_hw = gen8_init_common_ring;
1894 ring->get_seqno = gen8_get_seqno;
1895 ring->set_seqno = gen8_set_seqno;
1896 ring->emit_request = gen8_emit_request;
1897 ring->emit_flush = gen8_emit_flush;
1898 ring->irq_get = gen8_logical_ring_get_irq;
1899 ring->irq_put = gen8_logical_ring_put_irq;
1900 ring->emit_bb_start = gen8_emit_bb_start;
1902 return logical_ring_init(dev, ring);
1906 * intel_logical_rings_init() - allocate, populate and init the Engine Command Streamers
1909 * This function inits the engines for an Execlists submission style (the equivalent in the
1910 * legacy ringbuffer submission world would be i915_gem_init_rings). It does it only for
1911 * those engines that are present in the hardware.
1913 * Return: non-zero if the initialization failed.
1915 int intel_logical_rings_init(struct drm_device *dev)
1917 struct drm_i915_private *dev_priv = dev->dev_private;
1920 ret = logical_render_ring_init(dev);
1925 ret = logical_bsd_ring_init(dev);
1927 goto cleanup_render_ring;
1931 ret = logical_blt_ring_init(dev);
1933 goto cleanup_bsd_ring;
1936 if (HAS_VEBOX(dev)) {
1937 ret = logical_vebox_ring_init(dev);
1939 goto cleanup_blt_ring;
1942 if (HAS_BSD2(dev)) {
1943 ret = logical_bsd2_ring_init(dev);
1945 goto cleanup_vebox_ring;
1948 ret = i915_gem_set_seqno(dev, ((u32)~0 - 0x1000));
1950 goto cleanup_bsd2_ring;
1955 intel_logical_ring_cleanup(&dev_priv->ring[VCS2]);
1957 intel_logical_ring_cleanup(&dev_priv->ring[VECS]);
1959 intel_logical_ring_cleanup(&dev_priv->ring[BCS]);
1961 intel_logical_ring_cleanup(&dev_priv->ring[VCS]);
1962 cleanup_render_ring:
1963 intel_logical_ring_cleanup(&dev_priv->ring[RCS]);
1969 make_rpcs(struct drm_device *dev)
1974 * No explicit RPCS request is needed to ensure full
1975 * slice/subslice/EU enablement prior to Gen9.
1977 if (INTEL_INFO(dev)->gen < 9)
1981 * Starting in Gen9, render power gating can leave
1982 * slice/subslice/EU in a partially enabled state. We
1983 * must make an explicit request through RPCS for full
1986 if (INTEL_INFO(dev)->has_slice_pg) {
1987 rpcs |= GEN8_RPCS_S_CNT_ENABLE;
1988 rpcs |= INTEL_INFO(dev)->slice_total <<
1989 GEN8_RPCS_S_CNT_SHIFT;
1990 rpcs |= GEN8_RPCS_ENABLE;
1993 if (INTEL_INFO(dev)->has_subslice_pg) {
1994 rpcs |= GEN8_RPCS_SS_CNT_ENABLE;
1995 rpcs |= INTEL_INFO(dev)->subslice_per_slice <<
1996 GEN8_RPCS_SS_CNT_SHIFT;
1997 rpcs |= GEN8_RPCS_ENABLE;
2000 if (INTEL_INFO(dev)->has_eu_pg) {
2001 rpcs |= INTEL_INFO(dev)->eu_per_subslice <<
2002 GEN8_RPCS_EU_MIN_SHIFT;
2003 rpcs |= INTEL_INFO(dev)->eu_per_subslice <<
2004 GEN8_RPCS_EU_MAX_SHIFT;
2005 rpcs |= GEN8_RPCS_ENABLE;
2012 populate_lr_context(struct intel_context *ctx, struct drm_i915_gem_object *ctx_obj,
2013 struct intel_engine_cs *ring, struct intel_ringbuffer *ringbuf)
2015 struct drm_device *dev = ring->dev;
2016 struct drm_i915_private *dev_priv = dev->dev_private;
2017 struct i915_hw_ppgtt *ppgtt = ctx->ppgtt;
2019 uint32_t *reg_state;
2023 ppgtt = dev_priv->mm.aliasing_ppgtt;
2025 ret = i915_gem_object_set_to_cpu_domain(ctx_obj, true);
2027 DRM_DEBUG_DRIVER("Could not set to CPU domain\n");
2031 ret = i915_gem_object_get_pages(ctx_obj);
2033 DRM_DEBUG_DRIVER("Could not get object pages\n");
2037 i915_gem_object_pin_pages(ctx_obj);
2039 /* The second page of the context object contains some fields which must
2040 * be set up prior to the first execution. */
2041 page = i915_gem_object_get_page(ctx_obj, 1);
2042 reg_state = kmap_atomic(page);
2044 /* A context is actually a big batch buffer with several MI_LOAD_REGISTER_IMM
2045 * commands followed by (reg, value) pairs. The values we are setting here are
2046 * only for the first context restore: on a subsequent save, the GPU will
2047 * recreate this batchbuffer with new values (including all the missing
2048 * MI_LOAD_REGISTER_IMM commands that we are not initializing here). */
2049 if (ring->id == RCS)
2050 reg_state[CTX_LRI_HEADER_0] = MI_LOAD_REGISTER_IMM(14);
2052 reg_state[CTX_LRI_HEADER_0] = MI_LOAD_REGISTER_IMM(11);
2053 reg_state[CTX_LRI_HEADER_0] |= MI_LRI_FORCE_POSTED;
2054 reg_state[CTX_CONTEXT_CONTROL] = RING_CONTEXT_CONTROL(ring);
2055 reg_state[CTX_CONTEXT_CONTROL+1] =
2056 _MASKED_BIT_ENABLE(CTX_CTRL_INHIBIT_SYN_CTX_SWITCH |
2057 CTX_CTRL_ENGINE_CTX_RESTORE_INHIBIT |
2058 CTX_CTRL_RS_CTX_ENABLE);
2059 reg_state[CTX_RING_HEAD] = RING_HEAD(ring->mmio_base);
2060 reg_state[CTX_RING_HEAD+1] = 0;
2061 reg_state[CTX_RING_TAIL] = RING_TAIL(ring->mmio_base);
2062 reg_state[CTX_RING_TAIL+1] = 0;
2063 reg_state[CTX_RING_BUFFER_START] = RING_START(ring->mmio_base);
2064 /* Ring buffer start address is not known until the buffer is pinned.
2065 * It is written to the context image in execlists_update_context()
2067 reg_state[CTX_RING_BUFFER_CONTROL] = RING_CTL(ring->mmio_base);
2068 reg_state[CTX_RING_BUFFER_CONTROL+1] =
2069 ((ringbuf->size - PAGE_SIZE) & RING_NR_PAGES) | RING_VALID;
2070 reg_state[CTX_BB_HEAD_U] = ring->mmio_base + 0x168;
2071 reg_state[CTX_BB_HEAD_U+1] = 0;
2072 reg_state[CTX_BB_HEAD_L] = ring->mmio_base + 0x140;
2073 reg_state[CTX_BB_HEAD_L+1] = 0;
2074 reg_state[CTX_BB_STATE] = ring->mmio_base + 0x110;
2075 reg_state[CTX_BB_STATE+1] = (1<<5);
2076 reg_state[CTX_SECOND_BB_HEAD_U] = ring->mmio_base + 0x11c;
2077 reg_state[CTX_SECOND_BB_HEAD_U+1] = 0;
2078 reg_state[CTX_SECOND_BB_HEAD_L] = ring->mmio_base + 0x114;
2079 reg_state[CTX_SECOND_BB_HEAD_L+1] = 0;
2080 reg_state[CTX_SECOND_BB_STATE] = ring->mmio_base + 0x118;
2081 reg_state[CTX_SECOND_BB_STATE+1] = 0;
2082 if (ring->id == RCS) {
2083 reg_state[CTX_BB_PER_CTX_PTR] = ring->mmio_base + 0x1c0;
2084 reg_state[CTX_BB_PER_CTX_PTR+1] = 0;
2085 reg_state[CTX_RCS_INDIRECT_CTX] = ring->mmio_base + 0x1c4;
2086 reg_state[CTX_RCS_INDIRECT_CTX+1] = 0;
2087 reg_state[CTX_RCS_INDIRECT_CTX_OFFSET] = ring->mmio_base + 0x1c8;
2088 reg_state[CTX_RCS_INDIRECT_CTX_OFFSET+1] = 0;
2089 if (ring->wa_ctx.obj) {
2090 struct i915_ctx_workarounds *wa_ctx = &ring->wa_ctx;
2091 uint32_t ggtt_offset = i915_gem_obj_ggtt_offset(wa_ctx->obj);
2093 reg_state[CTX_RCS_INDIRECT_CTX+1] =
2094 (ggtt_offset + wa_ctx->indirect_ctx.offset * sizeof(uint32_t)) |
2095 (wa_ctx->indirect_ctx.size / CACHELINE_DWORDS);
2097 reg_state[CTX_RCS_INDIRECT_CTX_OFFSET+1] =
2098 CTX_RCS_INDIRECT_CTX_OFFSET_DEFAULT << 6;
2100 reg_state[CTX_BB_PER_CTX_PTR+1] =
2101 (ggtt_offset + wa_ctx->per_ctx.offset * sizeof(uint32_t)) |
2105 reg_state[CTX_LRI_HEADER_1] = MI_LOAD_REGISTER_IMM(9);
2106 reg_state[CTX_LRI_HEADER_1] |= MI_LRI_FORCE_POSTED;
2107 reg_state[CTX_CTX_TIMESTAMP] = ring->mmio_base + 0x3a8;
2108 reg_state[CTX_CTX_TIMESTAMP+1] = 0;
2109 reg_state[CTX_PDP3_UDW] = GEN8_RING_PDP_UDW(ring, 3);
2110 reg_state[CTX_PDP3_LDW] = GEN8_RING_PDP_LDW(ring, 3);
2111 reg_state[CTX_PDP2_UDW] = GEN8_RING_PDP_UDW(ring, 2);
2112 reg_state[CTX_PDP2_LDW] = GEN8_RING_PDP_LDW(ring, 2);
2113 reg_state[CTX_PDP1_UDW] = GEN8_RING_PDP_UDW(ring, 1);
2114 reg_state[CTX_PDP1_LDW] = GEN8_RING_PDP_LDW(ring, 1);
2115 reg_state[CTX_PDP0_UDW] = GEN8_RING_PDP_UDW(ring, 0);
2116 reg_state[CTX_PDP0_LDW] = GEN8_RING_PDP_LDW(ring, 0);
2118 /* With dynamic page allocation, PDPs may not be allocated at this point,
2119 * Point the unallocated PDPs to the scratch page
2121 ASSIGN_CTX_PDP(ppgtt, reg_state, 3);
2122 ASSIGN_CTX_PDP(ppgtt, reg_state, 2);
2123 ASSIGN_CTX_PDP(ppgtt, reg_state, 1);
2124 ASSIGN_CTX_PDP(ppgtt, reg_state, 0);
2125 if (ring->id == RCS) {
2126 reg_state[CTX_LRI_HEADER_2] = MI_LOAD_REGISTER_IMM(1);
2127 reg_state[CTX_R_PWR_CLK_STATE] = GEN8_R_PWR_CLK_STATE;
2128 reg_state[CTX_R_PWR_CLK_STATE+1] = make_rpcs(dev);
2131 kunmap_atomic(reg_state);
2134 set_page_dirty(page);
2135 i915_gem_object_unpin_pages(ctx_obj);
2141 * intel_lr_context_free() - free the LRC specific bits of a context
2142 * @ctx: the LR context to free.
2144 * The real context freeing is done in i915_gem_context_free: this only
2145 * takes care of the bits that are LRC related: the per-engine backing
2146 * objects and the logical ringbuffer.
2148 void intel_lr_context_free(struct intel_context *ctx)
2152 for (i = 0; i < I915_NUM_RINGS; i++) {
2153 struct drm_i915_gem_object *ctx_obj = ctx->engine[i].state;
2156 struct intel_ringbuffer *ringbuf =
2157 ctx->engine[i].ringbuf;
2158 struct intel_engine_cs *ring = ringbuf->ring;
2160 if (ctx == ring->default_context) {
2161 intel_unpin_ringbuffer_obj(ringbuf);
2162 i915_gem_object_ggtt_unpin(ctx_obj);
2164 WARN_ON(ctx->engine[ring->id].pin_count);
2165 intel_destroy_ringbuffer_obj(ringbuf);
2167 drm_gem_object_unreference(&ctx_obj->base);
2172 static uint32_t get_lr_context_size(struct intel_engine_cs *ring)
2176 WARN_ON(INTEL_INFO(ring->dev)->gen < 8);
2180 if (INTEL_INFO(ring->dev)->gen >= 9)
2181 ret = GEN9_LR_CONTEXT_RENDER_SIZE;
2183 ret = GEN8_LR_CONTEXT_RENDER_SIZE;
2189 ret = GEN8_LR_CONTEXT_OTHER_SIZE;
2196 static void lrc_setup_hardware_status_page(struct intel_engine_cs *ring,
2197 struct drm_i915_gem_object *default_ctx_obj)
2199 struct drm_i915_private *dev_priv = ring->dev->dev_private;
2201 /* The status page is offset 0 from the default context object
2203 ring->status_page.gfx_addr = i915_gem_obj_ggtt_offset(default_ctx_obj);
2204 ring->status_page.page_addr =
2205 kmap(sg_page(default_ctx_obj->pages->sgl));
2206 ring->status_page.obj = default_ctx_obj;
2208 I915_WRITE(RING_HWS_PGA(ring->mmio_base),
2209 (u32)ring->status_page.gfx_addr);
2210 POSTING_READ(RING_HWS_PGA(ring->mmio_base));
2214 * intel_lr_context_deferred_create() - create the LRC specific bits of a context
2215 * @ctx: LR context to create.
2216 * @ring: engine to be used with the context.
2218 * This function can be called more than once, with different engines, if we plan
2219 * to use the context with them. The context backing objects and the ringbuffers
2220 * (specially the ringbuffer backing objects) suck a lot of memory up, and that's why
2221 * the creation is a deferred call: it's better to make sure first that we need to use
2222 * a given ring with the context.
2224 * Return: non-zero on error.
2226 int intel_lr_context_deferred_create(struct intel_context *ctx,
2227 struct intel_engine_cs *ring)
2229 const bool is_global_default_ctx = (ctx == ring->default_context);
2230 struct drm_device *dev = ring->dev;
2231 struct drm_i915_gem_object *ctx_obj;
2232 uint32_t context_size;
2233 struct intel_ringbuffer *ringbuf;
2236 WARN_ON(ctx->legacy_hw_ctx.rcs_state != NULL);
2237 WARN_ON(ctx->engine[ring->id].state);
2239 context_size = round_up(get_lr_context_size(ring), 4096);
2241 ctx_obj = i915_gem_alloc_object(dev, context_size);
2243 DRM_DEBUG_DRIVER("Alloc LRC backing obj failed.\n");
2247 if (is_global_default_ctx) {
2248 ret = i915_gem_obj_ggtt_pin(ctx_obj, GEN8_LR_CONTEXT_ALIGN, 0);
2250 DRM_DEBUG_DRIVER("Pin LRC backing obj failed: %d\n",
2252 drm_gem_object_unreference(&ctx_obj->base);
2257 ringbuf = kzalloc(sizeof(*ringbuf), GFP_KERNEL);
2259 DRM_DEBUG_DRIVER("Failed to allocate ringbuffer %s\n",
2262 goto error_unpin_ctx;
2265 ringbuf->ring = ring;
2267 ringbuf->size = 32 * PAGE_SIZE;
2268 ringbuf->effective_size = ringbuf->size;
2271 ringbuf->last_retired_head = -1;
2272 intel_ring_update_space(ringbuf);
2274 if (ringbuf->obj == NULL) {
2275 ret = intel_alloc_ringbuffer_obj(dev, ringbuf);
2278 "Failed to allocate ringbuffer obj %s: %d\n",
2280 goto error_free_rbuf;
2283 if (is_global_default_ctx) {
2284 ret = intel_pin_and_map_ringbuffer_obj(dev, ringbuf);
2287 "Failed to pin and map ringbuffer %s: %d\n",
2289 goto error_destroy_rbuf;
2295 ret = populate_lr_context(ctx, ctx_obj, ring, ringbuf);
2297 DRM_DEBUG_DRIVER("Failed to populate LRC: %d\n", ret);
2301 ctx->engine[ring->id].ringbuf = ringbuf;
2302 ctx->engine[ring->id].state = ctx_obj;
2304 if (ctx == ring->default_context)
2305 lrc_setup_hardware_status_page(ring, ctx_obj);
2306 else if (ring->id == RCS && !ctx->rcs_initialized) {
2307 if (ring->init_context) {
2308 struct drm_i915_gem_request *req;
2310 ret = i915_gem_request_alloc(ring, ctx, &req);
2314 ret = ring->init_context(req);
2316 DRM_ERROR("ring init context: %d\n", ret);
2317 i915_gem_request_cancel(req);
2318 ctx->engine[ring->id].ringbuf = NULL;
2319 ctx->engine[ring->id].state = NULL;
2323 i915_add_request_no_flush(req);
2326 ctx->rcs_initialized = true;
2332 if (is_global_default_ctx)
2333 intel_unpin_ringbuffer_obj(ringbuf);
2335 intel_destroy_ringbuffer_obj(ringbuf);
2339 if (is_global_default_ctx)
2340 i915_gem_object_ggtt_unpin(ctx_obj);
2341 drm_gem_object_unreference(&ctx_obj->base);
2345 void intel_lr_context_reset(struct drm_device *dev,
2346 struct intel_context *ctx)
2348 struct drm_i915_private *dev_priv = dev->dev_private;
2349 struct intel_engine_cs *ring;
2352 for_each_ring(ring, dev_priv, i) {
2353 struct drm_i915_gem_object *ctx_obj =
2354 ctx->engine[ring->id].state;
2355 struct intel_ringbuffer *ringbuf =
2356 ctx->engine[ring->id].ringbuf;
2357 uint32_t *reg_state;
2363 if (i915_gem_object_get_pages(ctx_obj)) {
2364 WARN(1, "Failed get_pages for context obj\n");
2367 page = i915_gem_object_get_page(ctx_obj, 1);
2368 reg_state = kmap_atomic(page);
2370 reg_state[CTX_RING_HEAD+1] = 0;
2371 reg_state[CTX_RING_TAIL+1] = 0;
2373 kunmap_atomic(reg_state);