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 ADVANCED_CONTEXT = 0,
197 #define GEN8_CTX_MODE_SHIFT 3
200 FAULT_AND_HALT, /* Debug only */
202 FAULT_AND_CONTINUE /* Unsupported */
204 #define GEN8_CTX_ID_SHIFT 32
206 static int intel_lr_context_pin(struct intel_engine_cs *ring,
207 struct intel_context *ctx);
210 * intel_sanitize_enable_execlists() - sanitize i915.enable_execlists
212 * @enable_execlists: value of i915.enable_execlists module parameter.
214 * Only certain platforms support Execlists (the prerequisites being
215 * support for Logical Ring Contexts and Aliasing PPGTT or better),
216 * and only when enabled via module parameter.
218 * Return: 1 if Execlists is supported and has to be enabled.
220 int intel_sanitize_enable_execlists(struct drm_device *dev, int enable_execlists)
222 WARN_ON(i915.enable_ppgtt == -1);
224 if (INTEL_INFO(dev)->gen >= 9)
227 if (enable_execlists == 0)
230 if (HAS_LOGICAL_RING_CONTEXTS(dev) && USES_PPGTT(dev) &&
231 i915.use_mmio_flip >= 0)
238 * intel_execlists_ctx_id() - get the Execlists Context ID
239 * @ctx_obj: Logical Ring Context backing object.
241 * Do not confuse with ctx->id! Unfortunately we have a name overload
242 * here: the old context ID we pass to userspace as a handler so that
243 * they can refer to a context, and the new context ID we pass to the
244 * ELSP so that the GPU can inform us of the context status via
247 * Return: 20-bits globally unique context ID.
249 u32 intel_execlists_ctx_id(struct drm_i915_gem_object *ctx_obj)
251 u32 lrca = i915_gem_obj_ggtt_offset(ctx_obj);
253 /* LRCA is required to be 4K aligned so the more significant 20 bits
254 * are globally unique */
258 static uint64_t execlists_ctx_descriptor(struct drm_i915_gem_object *ctx_obj)
261 uint64_t lrca = i915_gem_obj_ggtt_offset(ctx_obj);
263 WARN_ON(lrca & 0xFFFFFFFF00000FFFULL);
265 desc = GEN8_CTX_VALID;
266 desc |= LEGACY_CONTEXT << GEN8_CTX_MODE_SHIFT;
267 desc |= GEN8_CTX_L3LLC_COHERENT;
268 desc |= GEN8_CTX_PRIVILEGE;
270 desc |= (u64)intel_execlists_ctx_id(ctx_obj) << GEN8_CTX_ID_SHIFT;
272 /* TODO: WaDisableLiteRestore when we start using semaphore
273 * signalling between Command Streamers */
274 /* desc |= GEN8_CTX_FORCE_RESTORE; */
279 static void execlists_elsp_write(struct intel_engine_cs *ring,
280 struct drm_i915_gem_object *ctx_obj0,
281 struct drm_i915_gem_object *ctx_obj1)
283 struct drm_device *dev = ring->dev;
284 struct drm_i915_private *dev_priv = dev->dev_private;
289 /* XXX: You must always write both descriptors in the order below. */
291 temp = execlists_ctx_descriptor(ctx_obj1);
294 desc[1] = (u32)(temp >> 32);
297 temp = execlists_ctx_descriptor(ctx_obj0);
298 desc[3] = (u32)(temp >> 32);
301 /* Set Force Wakeup bit to prevent GT from entering C6 while ELSP writes
304 * The other problem is that we can't just call gen6_gt_force_wake_get()
305 * because that function calls intel_runtime_pm_get(), which might sleep.
306 * Instead, we do the runtime_pm_get/put when creating/destroying requests.
308 spin_lock_irqsave(&dev_priv->uncore.lock, flags);
309 if (IS_CHERRYVIEW(dev) || INTEL_INFO(dev)->gen >= 9) {
310 if (dev_priv->uncore.fw_rendercount++ == 0)
311 dev_priv->uncore.funcs.force_wake_get(dev_priv,
313 if (dev_priv->uncore.fw_mediacount++ == 0)
314 dev_priv->uncore.funcs.force_wake_get(dev_priv,
316 if (INTEL_INFO(dev)->gen >= 9) {
317 if (dev_priv->uncore.fw_blittercount++ == 0)
318 dev_priv->uncore.funcs.force_wake_get(dev_priv,
322 if (dev_priv->uncore.forcewake_count++ == 0)
323 dev_priv->uncore.funcs.force_wake_get(dev_priv,
326 spin_unlock_irqrestore(&dev_priv->uncore.lock, flags);
328 I915_WRITE(RING_ELSP(ring), desc[1]);
329 I915_WRITE(RING_ELSP(ring), desc[0]);
330 I915_WRITE(RING_ELSP(ring), desc[3]);
331 /* The context is automatically loaded after the following */
332 I915_WRITE(RING_ELSP(ring), desc[2]);
334 /* ELSP is a wo register, so use another nearby reg for posting instead */
335 POSTING_READ(RING_EXECLIST_STATUS(ring));
337 /* Release Force Wakeup (see the big comment above). */
338 spin_lock_irqsave(&dev_priv->uncore.lock, flags);
339 if (IS_CHERRYVIEW(dev) || INTEL_INFO(dev)->gen >= 9) {
340 if (--dev_priv->uncore.fw_rendercount == 0)
341 dev_priv->uncore.funcs.force_wake_put(dev_priv,
343 if (--dev_priv->uncore.fw_mediacount == 0)
344 dev_priv->uncore.funcs.force_wake_put(dev_priv,
346 if (INTEL_INFO(dev)->gen >= 9) {
347 if (--dev_priv->uncore.fw_blittercount == 0)
348 dev_priv->uncore.funcs.force_wake_put(dev_priv,
352 if (--dev_priv->uncore.forcewake_count == 0)
353 dev_priv->uncore.funcs.force_wake_put(dev_priv,
357 spin_unlock_irqrestore(&dev_priv->uncore.lock, flags);
360 static int execlists_update_context(struct drm_i915_gem_object *ctx_obj,
361 struct drm_i915_gem_object *ring_obj,
367 page = i915_gem_object_get_page(ctx_obj, 1);
368 reg_state = kmap_atomic(page);
370 reg_state[CTX_RING_TAIL+1] = tail;
371 reg_state[CTX_RING_BUFFER_START+1] = i915_gem_obj_ggtt_offset(ring_obj);
373 kunmap_atomic(reg_state);
378 static void execlists_submit_contexts(struct intel_engine_cs *ring,
379 struct intel_context *to0, u32 tail0,
380 struct intel_context *to1, u32 tail1)
382 struct drm_i915_gem_object *ctx_obj0 = to0->engine[ring->id].state;
383 struct intel_ringbuffer *ringbuf0 = to0->engine[ring->id].ringbuf;
384 struct drm_i915_gem_object *ctx_obj1 = NULL;
385 struct intel_ringbuffer *ringbuf1 = NULL;
388 WARN_ON(!i915_gem_obj_is_pinned(ctx_obj0));
389 WARN_ON(!i915_gem_obj_is_pinned(ringbuf0->obj));
391 execlists_update_context(ctx_obj0, ringbuf0->obj, tail0);
394 ringbuf1 = to1->engine[ring->id].ringbuf;
395 ctx_obj1 = to1->engine[ring->id].state;
397 WARN_ON(!i915_gem_obj_is_pinned(ctx_obj1));
398 WARN_ON(!i915_gem_obj_is_pinned(ringbuf1->obj));
400 execlists_update_context(ctx_obj1, ringbuf1->obj, tail1);
403 execlists_elsp_write(ring, ctx_obj0, ctx_obj1);
406 static void execlists_context_unqueue(struct intel_engine_cs *ring)
408 struct intel_ctx_submit_request *req0 = NULL, *req1 = NULL;
409 struct intel_ctx_submit_request *cursor = NULL, *tmp = NULL;
411 assert_spin_locked(&ring->execlist_lock);
413 if (list_empty(&ring->execlist_queue))
416 /* Try to read in pairs */
417 list_for_each_entry_safe(cursor, tmp, &ring->execlist_queue,
421 } else if (req0->ctx == cursor->ctx) {
422 /* Same ctx: ignore first request, as second request
423 * will update tail past first request's workload */
424 cursor->elsp_submitted = req0->elsp_submitted;
425 list_del(&req0->execlist_link);
426 list_add_tail(&req0->execlist_link,
427 &ring->execlist_retired_req_list);
435 WARN_ON(req1 && req1->elsp_submitted);
437 execlists_submit_contexts(ring, req0->ctx, req0->tail,
438 req1 ? req1->ctx : NULL,
439 req1 ? req1->tail : 0);
441 req0->elsp_submitted++;
443 req1->elsp_submitted++;
446 static bool execlists_check_remove_request(struct intel_engine_cs *ring,
449 struct intel_ctx_submit_request *head_req;
451 assert_spin_locked(&ring->execlist_lock);
453 head_req = list_first_entry_or_null(&ring->execlist_queue,
454 struct intel_ctx_submit_request,
457 if (head_req != NULL) {
458 struct drm_i915_gem_object *ctx_obj =
459 head_req->ctx->engine[ring->id].state;
460 if (intel_execlists_ctx_id(ctx_obj) == request_id) {
461 WARN(head_req->elsp_submitted == 0,
462 "Never submitted head request\n");
464 if (--head_req->elsp_submitted <= 0) {
465 list_del(&head_req->execlist_link);
466 list_add_tail(&head_req->execlist_link,
467 &ring->execlist_retired_req_list);
477 * intel_execlists_handle_ctx_events() - handle Context Switch interrupts
478 * @ring: Engine Command Streamer to handle.
480 * Check the unread Context Status Buffers and manage the submission of new
481 * contexts to the ELSP accordingly.
483 void intel_execlists_handle_ctx_events(struct intel_engine_cs *ring)
485 struct drm_i915_private *dev_priv = ring->dev->dev_private;
491 u32 submit_contexts = 0;
493 status_pointer = I915_READ(RING_CONTEXT_STATUS_PTR(ring));
495 read_pointer = ring->next_context_status_buffer;
496 write_pointer = status_pointer & 0x07;
497 if (read_pointer > write_pointer)
500 spin_lock(&ring->execlist_lock);
502 while (read_pointer < write_pointer) {
504 status = I915_READ(RING_CONTEXT_STATUS_BUF(ring) +
505 (read_pointer % 6) * 8);
506 status_id = I915_READ(RING_CONTEXT_STATUS_BUF(ring) +
507 (read_pointer % 6) * 8 + 4);
509 if (status & GEN8_CTX_STATUS_PREEMPTED) {
510 if (status & GEN8_CTX_STATUS_LITE_RESTORE) {
511 if (execlists_check_remove_request(ring, status_id))
512 WARN(1, "Lite Restored request removed from queue\n");
514 WARN(1, "Preemption without Lite Restore\n");
517 if ((status & GEN8_CTX_STATUS_ACTIVE_IDLE) ||
518 (status & GEN8_CTX_STATUS_ELEMENT_SWITCH)) {
519 if (execlists_check_remove_request(ring, status_id))
524 if (submit_contexts != 0)
525 execlists_context_unqueue(ring);
527 spin_unlock(&ring->execlist_lock);
529 WARN(submit_contexts > 2, "More than two context complete events?\n");
530 ring->next_context_status_buffer = write_pointer % 6;
532 I915_WRITE(RING_CONTEXT_STATUS_PTR(ring),
533 ((u32)ring->next_context_status_buffer & 0x07) << 8);
536 static int execlists_context_queue(struct intel_engine_cs *ring,
537 struct intel_context *to,
540 struct intel_ctx_submit_request *req = NULL, *cursor;
541 struct drm_i915_private *dev_priv = ring->dev->dev_private;
543 int num_elements = 0;
545 req = kzalloc(sizeof(*req), GFP_KERNEL);
549 i915_gem_context_reference(req->ctx);
551 if (to != ring->default_context)
552 intel_lr_context_pin(ring, to);
557 intel_runtime_pm_get(dev_priv);
559 spin_lock_irqsave(&ring->execlist_lock, flags);
561 list_for_each_entry(cursor, &ring->execlist_queue, execlist_link)
562 if (++num_elements > 2)
565 if (num_elements > 2) {
566 struct intel_ctx_submit_request *tail_req;
568 tail_req = list_last_entry(&ring->execlist_queue,
569 struct intel_ctx_submit_request,
572 if (to == tail_req->ctx) {
573 WARN(tail_req->elsp_submitted != 0,
574 "More than 2 already-submitted reqs queued\n");
575 list_del(&tail_req->execlist_link);
576 list_add_tail(&tail_req->execlist_link,
577 &ring->execlist_retired_req_list);
581 list_add_tail(&req->execlist_link, &ring->execlist_queue);
582 if (num_elements == 0)
583 execlists_context_unqueue(ring);
585 spin_unlock_irqrestore(&ring->execlist_lock, flags);
590 static int logical_ring_invalidate_all_caches(struct intel_ringbuffer *ringbuf)
592 struct intel_engine_cs *ring = ringbuf->ring;
593 uint32_t flush_domains;
597 if (ring->gpu_caches_dirty)
598 flush_domains = I915_GEM_GPU_DOMAINS;
600 ret = ring->emit_flush(ringbuf, I915_GEM_GPU_DOMAINS, flush_domains);
604 ring->gpu_caches_dirty = false;
608 static int execlists_move_to_gpu(struct intel_ringbuffer *ringbuf,
609 struct list_head *vmas)
611 struct intel_engine_cs *ring = ringbuf->ring;
612 struct i915_vma *vma;
613 uint32_t flush_domains = 0;
614 bool flush_chipset = false;
617 list_for_each_entry(vma, vmas, exec_list) {
618 struct drm_i915_gem_object *obj = vma->obj;
620 ret = i915_gem_object_sync(obj, ring);
624 if (obj->base.write_domain & I915_GEM_DOMAIN_CPU)
625 flush_chipset |= i915_gem_clflush_object(obj, false);
627 flush_domains |= obj->base.write_domain;
630 if (flush_domains & I915_GEM_DOMAIN_GTT)
633 /* Unconditionally invalidate gpu caches and ensure that we do flush
634 * any residual writes from the previous batch.
636 return logical_ring_invalidate_all_caches(ringbuf);
640 * execlists_submission() - submit a batchbuffer for execution, Execlists style
643 * @ring: Engine Command Streamer to submit to.
644 * @ctx: Context to employ for this submission.
645 * @args: execbuffer call arguments.
646 * @vmas: list of vmas.
647 * @batch_obj: the batchbuffer to submit.
648 * @exec_start: batchbuffer start virtual address pointer.
649 * @flags: translated execbuffer call flags.
651 * This is the evil twin version of i915_gem_ringbuffer_submission. It abstracts
652 * away the submission details of the execbuffer ioctl call.
654 * Return: non-zero if the submission fails.
656 int intel_execlists_submission(struct drm_device *dev, struct drm_file *file,
657 struct intel_engine_cs *ring,
658 struct intel_context *ctx,
659 struct drm_i915_gem_execbuffer2 *args,
660 struct list_head *vmas,
661 struct drm_i915_gem_object *batch_obj,
662 u64 exec_start, u32 flags)
664 struct drm_i915_private *dev_priv = dev->dev_private;
665 struct intel_ringbuffer *ringbuf = ctx->engine[ring->id].ringbuf;
670 instp_mode = args->flags & I915_EXEC_CONSTANTS_MASK;
671 instp_mask = I915_EXEC_CONSTANTS_MASK;
672 switch (instp_mode) {
673 case I915_EXEC_CONSTANTS_REL_GENERAL:
674 case I915_EXEC_CONSTANTS_ABSOLUTE:
675 case I915_EXEC_CONSTANTS_REL_SURFACE:
676 if (instp_mode != 0 && ring != &dev_priv->ring[RCS]) {
677 DRM_DEBUG("non-0 rel constants mode on non-RCS\n");
681 if (instp_mode != dev_priv->relative_constants_mode) {
682 if (instp_mode == I915_EXEC_CONSTANTS_REL_SURFACE) {
683 DRM_DEBUG("rel surface constants mode invalid on gen5+\n");
687 /* The HW changed the meaning on this bit on gen6 */
688 instp_mask &= ~I915_EXEC_CONSTANTS_REL_SURFACE;
692 DRM_DEBUG("execbuf with unknown constants: %d\n", instp_mode);
696 if (args->num_cliprects != 0) {
697 DRM_DEBUG("clip rectangles are only valid on pre-gen5\n");
700 if (args->DR4 == 0xffffffff) {
701 DRM_DEBUG("UXA submitting garbage DR4, fixing up\n");
705 if (args->DR1 || args->DR4 || args->cliprects_ptr) {
706 DRM_DEBUG("0 cliprects but dirt in cliprects fields\n");
711 if (args->flags & I915_EXEC_GEN7_SOL_RESET) {
712 DRM_DEBUG("sol reset is gen7 only\n");
716 ret = execlists_move_to_gpu(ringbuf, vmas);
720 if (ring == &dev_priv->ring[RCS] &&
721 instp_mode != dev_priv->relative_constants_mode) {
722 ret = intel_logical_ring_begin(ringbuf, 4);
726 intel_logical_ring_emit(ringbuf, MI_NOOP);
727 intel_logical_ring_emit(ringbuf, MI_LOAD_REGISTER_IMM(1));
728 intel_logical_ring_emit(ringbuf, INSTPM);
729 intel_logical_ring_emit(ringbuf, instp_mask << 16 | instp_mode);
730 intel_logical_ring_advance(ringbuf);
732 dev_priv->relative_constants_mode = instp_mode;
735 ret = ring->emit_bb_start(ringbuf, exec_start, flags);
739 i915_gem_execbuffer_move_to_active(vmas, ring);
740 i915_gem_execbuffer_retire_commands(dev, file, ring, batch_obj);
745 void intel_execlists_retire_requests(struct intel_engine_cs *ring)
747 struct intel_ctx_submit_request *req, *tmp;
748 struct drm_i915_private *dev_priv = ring->dev->dev_private;
750 struct list_head retired_list;
752 WARN_ON(!mutex_is_locked(&ring->dev->struct_mutex));
753 if (list_empty(&ring->execlist_retired_req_list))
756 INIT_LIST_HEAD(&retired_list);
757 spin_lock_irqsave(&ring->execlist_lock, flags);
758 list_replace_init(&ring->execlist_retired_req_list, &retired_list);
759 spin_unlock_irqrestore(&ring->execlist_lock, flags);
761 list_for_each_entry_safe(req, tmp, &retired_list, execlist_link) {
762 struct intel_context *ctx = req->ctx;
763 struct drm_i915_gem_object *ctx_obj =
764 ctx->engine[ring->id].state;
766 if (ctx_obj && (ctx != ring->default_context))
767 intel_lr_context_unpin(ring, ctx);
768 intel_runtime_pm_put(dev_priv);
769 i915_gem_context_unreference(req->ctx);
770 list_del(&req->execlist_link);
775 void intel_logical_ring_stop(struct intel_engine_cs *ring)
777 struct drm_i915_private *dev_priv = ring->dev->dev_private;
780 if (!intel_ring_initialized(ring))
783 ret = intel_ring_idle(ring);
784 if (ret && !i915_reset_in_progress(&to_i915(ring->dev)->gpu_error))
785 DRM_ERROR("failed to quiesce %s whilst cleaning up: %d\n",
788 /* TODO: Is this correct with Execlists enabled? */
789 I915_WRITE_MODE(ring, _MASKED_BIT_ENABLE(STOP_RING));
790 if (wait_for_atomic((I915_READ_MODE(ring) & MODE_IDLE) != 0, 1000)) {
791 DRM_ERROR("%s :timed out trying to stop ring\n", ring->name);
794 I915_WRITE_MODE(ring, _MASKED_BIT_DISABLE(STOP_RING));
797 int logical_ring_flush_all_caches(struct intel_ringbuffer *ringbuf)
799 struct intel_engine_cs *ring = ringbuf->ring;
802 if (!ring->gpu_caches_dirty)
805 ret = ring->emit_flush(ringbuf, 0, I915_GEM_GPU_DOMAINS);
809 ring->gpu_caches_dirty = false;
814 * intel_logical_ring_advance_and_submit() - advance the tail and submit the workload
815 * @ringbuf: Logical Ringbuffer to advance.
817 * The tail is updated in our logical ringbuffer struct, not in the actual context. What
818 * really happens during submission is that the context and current tail will be placed
819 * on a queue waiting for the ELSP to be ready to accept a new context submission. At that
820 * point, the tail *inside* the context is updated and the ELSP written to.
822 void intel_logical_ring_advance_and_submit(struct intel_ringbuffer *ringbuf)
824 struct intel_engine_cs *ring = ringbuf->ring;
825 struct intel_context *ctx = ringbuf->FIXME_lrc_ctx;
827 intel_logical_ring_advance(ringbuf);
829 if (intel_ring_stopped(ring))
832 execlists_context_queue(ring, ctx, ringbuf->tail);
835 static int intel_lr_context_pin(struct intel_engine_cs *ring,
836 struct intel_context *ctx)
838 struct drm_i915_gem_object *ctx_obj = ctx->engine[ring->id].state;
839 struct intel_ringbuffer *ringbuf = ctx->engine[ring->id].ringbuf;
842 WARN_ON(!mutex_is_locked(&ring->dev->struct_mutex));
843 if (ctx->engine[ring->id].unpin_count++ == 0) {
844 ret = i915_gem_obj_ggtt_pin(ctx_obj,
845 GEN8_LR_CONTEXT_ALIGN, 0);
847 goto reset_unpin_count;
849 ret = intel_pin_and_map_ringbuffer_obj(ring->dev, ringbuf);
857 i915_gem_object_ggtt_unpin(ctx_obj);
859 ctx->engine[ring->id].unpin_count = 0;
864 void intel_lr_context_unpin(struct intel_engine_cs *ring,
865 struct intel_context *ctx)
867 struct drm_i915_gem_object *ctx_obj = ctx->engine[ring->id].state;
868 struct intel_ringbuffer *ringbuf = ctx->engine[ring->id].ringbuf;
871 WARN_ON(!mutex_is_locked(&ring->dev->struct_mutex));
872 if (--ctx->engine[ring->id].unpin_count == 0) {
873 intel_unpin_ringbuffer_obj(ringbuf);
874 i915_gem_object_ggtt_unpin(ctx_obj);
879 static int logical_ring_alloc_seqno(struct intel_engine_cs *ring,
880 struct intel_context *ctx)
882 struct drm_i915_gem_request *request;
885 /* XXX: The aim is to replace seqno values with request structures.
886 * A step along the way is to switch to using the PLR in preference
887 * to the OLS. That requires the PLR to only be valid when the OLS is
888 * also valid. I.e., the two must be kept in step. */
890 if (ring->outstanding_lazy_seqno) {
891 WARN_ON(ring->preallocated_lazy_request == NULL);
894 WARN_ON(ring->preallocated_lazy_request != NULL);
896 request = kmalloc(sizeof(*request), GFP_KERNEL);
900 if (ctx != ring->default_context) {
901 ret = intel_lr_context_pin(ring, ctx);
908 kref_init(&request->ref);
910 ret = i915_gem_get_seqno(ring->dev, &ring->outstanding_lazy_seqno);
912 intel_lr_context_unpin(ring, ctx);
917 /* Hold a reference to the context this request belongs to
918 * (we will need it when the time comes to emit/retire the
922 i915_gem_context_reference(request->ctx);
924 ring->preallocated_lazy_request = request;
928 static int logical_ring_wait_request(struct intel_ringbuffer *ringbuf,
931 struct intel_engine_cs *ring = ringbuf->ring;
932 struct drm_i915_gem_request *request;
936 if (ringbuf->last_retired_head != -1) {
937 ringbuf->head = ringbuf->last_retired_head;
938 ringbuf->last_retired_head = -1;
940 ringbuf->space = intel_ring_space(ringbuf);
941 if (ringbuf->space >= bytes)
945 list_for_each_entry(request, &ring->request_list, list) {
947 * The request queue is per-engine, so can contain requests
948 * from multiple ringbuffers. Here, we must ignore any that
949 * aren't from the ringbuffer we're considering.
951 struct intel_context *ctx = request->ctx;
952 if (ctx->engine[ring->id].ringbuf != ringbuf)
955 /* Would completion of this request free enough space? */
956 if (__intel_ring_space(request->tail, ringbuf->tail,
957 ringbuf->size) >= bytes) {
958 seqno = request->seqno;
966 ret = i915_wait_seqno(ring, seqno);
970 i915_gem_retire_requests_ring(ring);
971 ringbuf->head = ringbuf->last_retired_head;
972 ringbuf->last_retired_head = -1;
974 ringbuf->space = intel_ring_space(ringbuf);
978 static int logical_ring_wait_for_space(struct intel_ringbuffer *ringbuf,
981 struct intel_engine_cs *ring = ringbuf->ring;
982 struct drm_device *dev = ring->dev;
983 struct drm_i915_private *dev_priv = dev->dev_private;
987 ret = logical_ring_wait_request(ringbuf, bytes);
991 /* Force the context submission in case we have been skipping it */
992 intel_logical_ring_advance_and_submit(ringbuf);
994 /* With GEM the hangcheck timer should kick us out of the loop,
995 * leaving it early runs the risk of corrupting GEM state (due
996 * to running on almost untested codepaths). But on resume
997 * timers don't work yet, so prevent a complete hang in that
998 * case by choosing an insanely large timeout. */
999 end = jiffies + 60 * HZ;
1002 ringbuf->space = intel_ring_space(ringbuf);
1003 if (ringbuf->space >= bytes) {
1010 if (dev_priv->mm.interruptible && signal_pending(current)) {
1015 ret = i915_gem_check_wedge(&dev_priv->gpu_error,
1016 dev_priv->mm.interruptible);
1020 if (time_after(jiffies, end)) {
1029 static int logical_ring_wrap_buffer(struct intel_ringbuffer *ringbuf)
1031 uint32_t __iomem *virt;
1032 int rem = ringbuf->size - ringbuf->tail;
1034 if (ringbuf->space < rem) {
1035 int ret = logical_ring_wait_for_space(ringbuf, rem);
1041 virt = ringbuf->virtual_start + ringbuf->tail;
1044 iowrite32(MI_NOOP, virt++);
1047 ringbuf->space = intel_ring_space(ringbuf);
1052 static int logical_ring_prepare(struct intel_ringbuffer *ringbuf, int bytes)
1056 if (unlikely(ringbuf->tail + bytes > ringbuf->effective_size)) {
1057 ret = logical_ring_wrap_buffer(ringbuf);
1062 if (unlikely(ringbuf->space < bytes)) {
1063 ret = logical_ring_wait_for_space(ringbuf, bytes);
1072 * intel_logical_ring_begin() - prepare the logical ringbuffer to accept some commands
1074 * @ringbuf: Logical ringbuffer.
1075 * @num_dwords: number of DWORDs that we plan to write to the ringbuffer.
1077 * The ringbuffer might not be ready to accept the commands right away (maybe it needs to
1078 * be wrapped, or wait a bit for the tail to be updated). This function takes care of that
1079 * and also preallocates a request (every workload submission is still mediated through
1080 * requests, same as it did with legacy ringbuffer submission).
1082 * Return: non-zero if the ringbuffer is not ready to be written to.
1084 int intel_logical_ring_begin(struct intel_ringbuffer *ringbuf, int num_dwords)
1086 struct intel_engine_cs *ring = ringbuf->ring;
1087 struct drm_device *dev = ring->dev;
1088 struct drm_i915_private *dev_priv = dev->dev_private;
1091 ret = i915_gem_check_wedge(&dev_priv->gpu_error,
1092 dev_priv->mm.interruptible);
1096 ret = logical_ring_prepare(ringbuf, num_dwords * sizeof(uint32_t));
1100 /* Preallocate the olr before touching the ring */
1101 ret = logical_ring_alloc_seqno(ring, ringbuf->FIXME_lrc_ctx);
1105 ringbuf->space -= num_dwords * sizeof(uint32_t);
1109 static int intel_logical_ring_workarounds_emit(struct intel_engine_cs *ring,
1110 struct intel_context *ctx)
1113 struct intel_ringbuffer *ringbuf = ctx->engine[ring->id].ringbuf;
1114 struct drm_device *dev = ring->dev;
1115 struct drm_i915_private *dev_priv = dev->dev_private;
1116 struct i915_workarounds *w = &dev_priv->workarounds;
1118 if (WARN_ON(w->count == 0))
1121 ring->gpu_caches_dirty = true;
1122 ret = logical_ring_flush_all_caches(ringbuf);
1126 ret = intel_logical_ring_begin(ringbuf, w->count * 2 + 2);
1130 intel_logical_ring_emit(ringbuf, MI_LOAD_REGISTER_IMM(w->count));
1131 for (i = 0; i < w->count; i++) {
1132 intel_logical_ring_emit(ringbuf, w->reg[i].addr);
1133 intel_logical_ring_emit(ringbuf, w->reg[i].value);
1135 intel_logical_ring_emit(ringbuf, MI_NOOP);
1137 intel_logical_ring_advance(ringbuf);
1139 ring->gpu_caches_dirty = true;
1140 ret = logical_ring_flush_all_caches(ringbuf);
1147 static int gen8_init_common_ring(struct intel_engine_cs *ring)
1149 struct drm_device *dev = ring->dev;
1150 struct drm_i915_private *dev_priv = dev->dev_private;
1152 I915_WRITE_IMR(ring, ~(ring->irq_enable_mask | ring->irq_keep_mask));
1153 I915_WRITE(RING_HWSTAM(ring->mmio_base), 0xffffffff);
1155 I915_WRITE(RING_MODE_GEN7(ring),
1156 _MASKED_BIT_DISABLE(GFX_REPLAY_MODE) |
1157 _MASKED_BIT_ENABLE(GFX_RUN_LIST_ENABLE));
1158 POSTING_READ(RING_MODE_GEN7(ring));
1159 DRM_DEBUG_DRIVER("Execlists enabled for %s\n", ring->name);
1161 memset(&ring->hangcheck, 0, sizeof(ring->hangcheck));
1166 static int gen8_init_render_ring(struct intel_engine_cs *ring)
1168 struct drm_device *dev = ring->dev;
1169 struct drm_i915_private *dev_priv = dev->dev_private;
1172 ret = gen8_init_common_ring(ring);
1176 /* We need to disable the AsyncFlip performance optimisations in order
1177 * to use MI_WAIT_FOR_EVENT within the CS. It should already be
1178 * programmed to '1' on all products.
1180 * WaDisableAsyncFlipPerfMode:snb,ivb,hsw,vlv,bdw,chv
1182 I915_WRITE(MI_MODE, _MASKED_BIT_ENABLE(ASYNC_FLIP_PERF_DISABLE));
1184 ret = intel_init_pipe_control(ring);
1188 I915_WRITE(INSTPM, _MASKED_BIT_ENABLE(INSTPM_FORCE_ORDERING));
1190 return init_workarounds_ring(ring);
1193 static int gen8_emit_bb_start(struct intel_ringbuffer *ringbuf,
1194 u64 offset, unsigned flags)
1196 bool ppgtt = !(flags & I915_DISPATCH_SECURE);
1199 ret = intel_logical_ring_begin(ringbuf, 4);
1203 /* FIXME(BDW): Address space and security selectors. */
1204 intel_logical_ring_emit(ringbuf, MI_BATCH_BUFFER_START_GEN8 | (ppgtt<<8));
1205 intel_logical_ring_emit(ringbuf, lower_32_bits(offset));
1206 intel_logical_ring_emit(ringbuf, upper_32_bits(offset));
1207 intel_logical_ring_emit(ringbuf, MI_NOOP);
1208 intel_logical_ring_advance(ringbuf);
1213 static bool gen8_logical_ring_get_irq(struct intel_engine_cs *ring)
1215 struct drm_device *dev = ring->dev;
1216 struct drm_i915_private *dev_priv = dev->dev_private;
1217 unsigned long flags;
1219 if (WARN_ON(!intel_irqs_enabled(dev_priv)))
1222 spin_lock_irqsave(&dev_priv->irq_lock, flags);
1223 if (ring->irq_refcount++ == 0) {
1224 I915_WRITE_IMR(ring, ~(ring->irq_enable_mask | ring->irq_keep_mask));
1225 POSTING_READ(RING_IMR(ring->mmio_base));
1227 spin_unlock_irqrestore(&dev_priv->irq_lock, flags);
1232 static void gen8_logical_ring_put_irq(struct intel_engine_cs *ring)
1234 struct drm_device *dev = ring->dev;
1235 struct drm_i915_private *dev_priv = dev->dev_private;
1236 unsigned long flags;
1238 spin_lock_irqsave(&dev_priv->irq_lock, flags);
1239 if (--ring->irq_refcount == 0) {
1240 I915_WRITE_IMR(ring, ~ring->irq_keep_mask);
1241 POSTING_READ(RING_IMR(ring->mmio_base));
1243 spin_unlock_irqrestore(&dev_priv->irq_lock, flags);
1246 static int gen8_emit_flush(struct intel_ringbuffer *ringbuf,
1247 u32 invalidate_domains,
1250 struct intel_engine_cs *ring = ringbuf->ring;
1251 struct drm_device *dev = ring->dev;
1252 struct drm_i915_private *dev_priv = dev->dev_private;
1256 ret = intel_logical_ring_begin(ringbuf, 4);
1260 cmd = MI_FLUSH_DW + 1;
1262 if (ring == &dev_priv->ring[VCS]) {
1263 if (invalidate_domains & I915_GEM_GPU_DOMAINS)
1264 cmd |= MI_INVALIDATE_TLB | MI_INVALIDATE_BSD |
1265 MI_FLUSH_DW_STORE_INDEX |
1266 MI_FLUSH_DW_OP_STOREDW;
1268 if (invalidate_domains & I915_GEM_DOMAIN_RENDER)
1269 cmd |= MI_INVALIDATE_TLB | MI_FLUSH_DW_STORE_INDEX |
1270 MI_FLUSH_DW_OP_STOREDW;
1273 intel_logical_ring_emit(ringbuf, cmd);
1274 intel_logical_ring_emit(ringbuf,
1275 I915_GEM_HWS_SCRATCH_ADDR |
1276 MI_FLUSH_DW_USE_GTT);
1277 intel_logical_ring_emit(ringbuf, 0); /* upper addr */
1278 intel_logical_ring_emit(ringbuf, 0); /* value */
1279 intel_logical_ring_advance(ringbuf);
1284 static int gen8_emit_flush_render(struct intel_ringbuffer *ringbuf,
1285 u32 invalidate_domains,
1288 struct intel_engine_cs *ring = ringbuf->ring;
1289 u32 scratch_addr = ring->scratch.gtt_offset + 2 * CACHELINE_BYTES;
1293 flags |= PIPE_CONTROL_CS_STALL;
1295 if (flush_domains) {
1296 flags |= PIPE_CONTROL_RENDER_TARGET_CACHE_FLUSH;
1297 flags |= PIPE_CONTROL_DEPTH_CACHE_FLUSH;
1300 if (invalidate_domains) {
1301 flags |= PIPE_CONTROL_TLB_INVALIDATE;
1302 flags |= PIPE_CONTROL_INSTRUCTION_CACHE_INVALIDATE;
1303 flags |= PIPE_CONTROL_TEXTURE_CACHE_INVALIDATE;
1304 flags |= PIPE_CONTROL_VF_CACHE_INVALIDATE;
1305 flags |= PIPE_CONTROL_CONST_CACHE_INVALIDATE;
1306 flags |= PIPE_CONTROL_STATE_CACHE_INVALIDATE;
1307 flags |= PIPE_CONTROL_QW_WRITE;
1308 flags |= PIPE_CONTROL_GLOBAL_GTT_IVB;
1311 ret = intel_logical_ring_begin(ringbuf, 6);
1315 intel_logical_ring_emit(ringbuf, GFX_OP_PIPE_CONTROL(6));
1316 intel_logical_ring_emit(ringbuf, flags);
1317 intel_logical_ring_emit(ringbuf, scratch_addr);
1318 intel_logical_ring_emit(ringbuf, 0);
1319 intel_logical_ring_emit(ringbuf, 0);
1320 intel_logical_ring_emit(ringbuf, 0);
1321 intel_logical_ring_advance(ringbuf);
1326 static u32 gen8_get_seqno(struct intel_engine_cs *ring, bool lazy_coherency)
1328 return intel_read_status_page(ring, I915_GEM_HWS_INDEX);
1331 static void gen8_set_seqno(struct intel_engine_cs *ring, u32 seqno)
1333 intel_write_status_page(ring, I915_GEM_HWS_INDEX, seqno);
1336 static int gen8_emit_request(struct intel_ringbuffer *ringbuf)
1338 struct intel_engine_cs *ring = ringbuf->ring;
1342 ret = intel_logical_ring_begin(ringbuf, 6);
1346 cmd = MI_STORE_DWORD_IMM_GEN8;
1347 cmd |= MI_GLOBAL_GTT;
1349 intel_logical_ring_emit(ringbuf, cmd);
1350 intel_logical_ring_emit(ringbuf,
1351 (ring->status_page.gfx_addr +
1352 (I915_GEM_HWS_INDEX << MI_STORE_DWORD_INDEX_SHIFT)));
1353 intel_logical_ring_emit(ringbuf, 0);
1354 intel_logical_ring_emit(ringbuf, ring->outstanding_lazy_seqno);
1355 intel_logical_ring_emit(ringbuf, MI_USER_INTERRUPT);
1356 intel_logical_ring_emit(ringbuf, MI_NOOP);
1357 intel_logical_ring_advance_and_submit(ringbuf);
1363 * intel_logical_ring_cleanup() - deallocate the Engine Command Streamer
1365 * @ring: Engine Command Streamer.
1368 void intel_logical_ring_cleanup(struct intel_engine_cs *ring)
1370 struct drm_i915_private *dev_priv;
1372 if (!intel_ring_initialized(ring))
1375 dev_priv = ring->dev->dev_private;
1377 intel_logical_ring_stop(ring);
1378 WARN_ON((I915_READ_MODE(ring) & MODE_IDLE) == 0);
1379 i915_gem_request_assign(&ring->preallocated_lazy_request, NULL);
1380 ring->outstanding_lazy_seqno = 0;
1383 ring->cleanup(ring);
1385 i915_cmd_parser_fini_ring(ring);
1387 if (ring->status_page.obj) {
1388 kunmap(sg_page(ring->status_page.obj->pages->sgl));
1389 ring->status_page.obj = NULL;
1393 static int logical_ring_init(struct drm_device *dev, struct intel_engine_cs *ring)
1397 /* Intentionally left blank. */
1398 ring->buffer = NULL;
1401 INIT_LIST_HEAD(&ring->active_list);
1402 INIT_LIST_HEAD(&ring->request_list);
1403 init_waitqueue_head(&ring->irq_queue);
1405 INIT_LIST_HEAD(&ring->execlist_queue);
1406 INIT_LIST_HEAD(&ring->execlist_retired_req_list);
1407 spin_lock_init(&ring->execlist_lock);
1408 ring->next_context_status_buffer = 0;
1410 ret = i915_cmd_parser_init_ring(ring);
1415 ret = ring->init(ring);
1420 ret = intel_lr_context_deferred_create(ring->default_context, ring);
1425 static int logical_render_ring_init(struct drm_device *dev)
1427 struct drm_i915_private *dev_priv = dev->dev_private;
1428 struct intel_engine_cs *ring = &dev_priv->ring[RCS];
1430 ring->name = "render ring";
1432 ring->mmio_base = RENDER_RING_BASE;
1433 ring->irq_enable_mask =
1434 GT_RENDER_USER_INTERRUPT << GEN8_RCS_IRQ_SHIFT;
1435 ring->irq_keep_mask =
1436 GT_CONTEXT_SWITCH_INTERRUPT << GEN8_RCS_IRQ_SHIFT;
1437 if (HAS_L3_DPF(dev))
1438 ring->irq_keep_mask |= GT_RENDER_L3_PARITY_ERROR_INTERRUPT;
1440 ring->init = gen8_init_render_ring;
1441 ring->init_context = intel_logical_ring_workarounds_emit;
1442 ring->cleanup = intel_fini_pipe_control;
1443 ring->get_seqno = gen8_get_seqno;
1444 ring->set_seqno = gen8_set_seqno;
1445 ring->emit_request = gen8_emit_request;
1446 ring->emit_flush = gen8_emit_flush_render;
1447 ring->irq_get = gen8_logical_ring_get_irq;
1448 ring->irq_put = gen8_logical_ring_put_irq;
1449 ring->emit_bb_start = gen8_emit_bb_start;
1451 return logical_ring_init(dev, ring);
1454 static int logical_bsd_ring_init(struct drm_device *dev)
1456 struct drm_i915_private *dev_priv = dev->dev_private;
1457 struct intel_engine_cs *ring = &dev_priv->ring[VCS];
1459 ring->name = "bsd ring";
1461 ring->mmio_base = GEN6_BSD_RING_BASE;
1462 ring->irq_enable_mask =
1463 GT_RENDER_USER_INTERRUPT << GEN8_VCS1_IRQ_SHIFT;
1464 ring->irq_keep_mask =
1465 GT_CONTEXT_SWITCH_INTERRUPT << GEN8_VCS1_IRQ_SHIFT;
1467 ring->init = gen8_init_common_ring;
1468 ring->get_seqno = gen8_get_seqno;
1469 ring->set_seqno = gen8_set_seqno;
1470 ring->emit_request = gen8_emit_request;
1471 ring->emit_flush = gen8_emit_flush;
1472 ring->irq_get = gen8_logical_ring_get_irq;
1473 ring->irq_put = gen8_logical_ring_put_irq;
1474 ring->emit_bb_start = gen8_emit_bb_start;
1476 return logical_ring_init(dev, ring);
1479 static int logical_bsd2_ring_init(struct drm_device *dev)
1481 struct drm_i915_private *dev_priv = dev->dev_private;
1482 struct intel_engine_cs *ring = &dev_priv->ring[VCS2];
1484 ring->name = "bds2 ring";
1486 ring->mmio_base = GEN8_BSD2_RING_BASE;
1487 ring->irq_enable_mask =
1488 GT_RENDER_USER_INTERRUPT << GEN8_VCS2_IRQ_SHIFT;
1489 ring->irq_keep_mask =
1490 GT_CONTEXT_SWITCH_INTERRUPT << GEN8_VCS2_IRQ_SHIFT;
1492 ring->init = gen8_init_common_ring;
1493 ring->get_seqno = gen8_get_seqno;
1494 ring->set_seqno = gen8_set_seqno;
1495 ring->emit_request = gen8_emit_request;
1496 ring->emit_flush = gen8_emit_flush;
1497 ring->irq_get = gen8_logical_ring_get_irq;
1498 ring->irq_put = gen8_logical_ring_put_irq;
1499 ring->emit_bb_start = gen8_emit_bb_start;
1501 return logical_ring_init(dev, ring);
1504 static int logical_blt_ring_init(struct drm_device *dev)
1506 struct drm_i915_private *dev_priv = dev->dev_private;
1507 struct intel_engine_cs *ring = &dev_priv->ring[BCS];
1509 ring->name = "blitter ring";
1511 ring->mmio_base = BLT_RING_BASE;
1512 ring->irq_enable_mask =
1513 GT_RENDER_USER_INTERRUPT << GEN8_BCS_IRQ_SHIFT;
1514 ring->irq_keep_mask =
1515 GT_CONTEXT_SWITCH_INTERRUPT << GEN8_BCS_IRQ_SHIFT;
1517 ring->init = gen8_init_common_ring;
1518 ring->get_seqno = gen8_get_seqno;
1519 ring->set_seqno = gen8_set_seqno;
1520 ring->emit_request = gen8_emit_request;
1521 ring->emit_flush = gen8_emit_flush;
1522 ring->irq_get = gen8_logical_ring_get_irq;
1523 ring->irq_put = gen8_logical_ring_put_irq;
1524 ring->emit_bb_start = gen8_emit_bb_start;
1526 return logical_ring_init(dev, ring);
1529 static int logical_vebox_ring_init(struct drm_device *dev)
1531 struct drm_i915_private *dev_priv = dev->dev_private;
1532 struct intel_engine_cs *ring = &dev_priv->ring[VECS];
1534 ring->name = "video enhancement ring";
1536 ring->mmio_base = VEBOX_RING_BASE;
1537 ring->irq_enable_mask =
1538 GT_RENDER_USER_INTERRUPT << GEN8_VECS_IRQ_SHIFT;
1539 ring->irq_keep_mask =
1540 GT_CONTEXT_SWITCH_INTERRUPT << GEN8_VECS_IRQ_SHIFT;
1542 ring->init = gen8_init_common_ring;
1543 ring->get_seqno = gen8_get_seqno;
1544 ring->set_seqno = gen8_set_seqno;
1545 ring->emit_request = gen8_emit_request;
1546 ring->emit_flush = gen8_emit_flush;
1547 ring->irq_get = gen8_logical_ring_get_irq;
1548 ring->irq_put = gen8_logical_ring_put_irq;
1549 ring->emit_bb_start = gen8_emit_bb_start;
1551 return logical_ring_init(dev, ring);
1555 * intel_logical_rings_init() - allocate, populate and init the Engine Command Streamers
1558 * This function inits the engines for an Execlists submission style (the equivalent in the
1559 * legacy ringbuffer submission world would be i915_gem_init_rings). It does it only for
1560 * those engines that are present in the hardware.
1562 * Return: non-zero if the initialization failed.
1564 int intel_logical_rings_init(struct drm_device *dev)
1566 struct drm_i915_private *dev_priv = dev->dev_private;
1569 ret = logical_render_ring_init(dev);
1574 ret = logical_bsd_ring_init(dev);
1576 goto cleanup_render_ring;
1580 ret = logical_blt_ring_init(dev);
1582 goto cleanup_bsd_ring;
1585 if (HAS_VEBOX(dev)) {
1586 ret = logical_vebox_ring_init(dev);
1588 goto cleanup_blt_ring;
1591 if (HAS_BSD2(dev)) {
1592 ret = logical_bsd2_ring_init(dev);
1594 goto cleanup_vebox_ring;
1597 ret = i915_gem_set_seqno(dev, ((u32)~0 - 0x1000));
1599 goto cleanup_bsd2_ring;
1604 intel_logical_ring_cleanup(&dev_priv->ring[VCS2]);
1606 intel_logical_ring_cleanup(&dev_priv->ring[VECS]);
1608 intel_logical_ring_cleanup(&dev_priv->ring[BCS]);
1610 intel_logical_ring_cleanup(&dev_priv->ring[VCS]);
1611 cleanup_render_ring:
1612 intel_logical_ring_cleanup(&dev_priv->ring[RCS]);
1617 int intel_lr_context_render_state_init(struct intel_engine_cs *ring,
1618 struct intel_context *ctx)
1620 struct intel_ringbuffer *ringbuf = ctx->engine[ring->id].ringbuf;
1621 struct render_state so;
1622 struct drm_i915_file_private *file_priv = ctx->file_priv;
1623 struct drm_file *file = file_priv ? file_priv->file : NULL;
1626 ret = i915_gem_render_state_prepare(ring, &so);
1630 if (so.rodata == NULL)
1633 ret = ring->emit_bb_start(ringbuf,
1635 I915_DISPATCH_SECURE);
1639 i915_vma_move_to_active(i915_gem_obj_to_ggtt(so.obj), ring);
1641 ret = __i915_add_request(ring, file, so.obj, NULL);
1642 /* intel_logical_ring_add_request moves object to inactive if it
1645 i915_gem_render_state_fini(&so);
1650 populate_lr_context(struct intel_context *ctx, struct drm_i915_gem_object *ctx_obj,
1651 struct intel_engine_cs *ring, struct intel_ringbuffer *ringbuf)
1653 struct drm_device *dev = ring->dev;
1654 struct drm_i915_private *dev_priv = dev->dev_private;
1655 struct i915_hw_ppgtt *ppgtt = ctx->ppgtt;
1657 uint32_t *reg_state;
1661 ppgtt = dev_priv->mm.aliasing_ppgtt;
1663 ret = i915_gem_object_set_to_cpu_domain(ctx_obj, true);
1665 DRM_DEBUG_DRIVER("Could not set to CPU domain\n");
1669 ret = i915_gem_object_get_pages(ctx_obj);
1671 DRM_DEBUG_DRIVER("Could not get object pages\n");
1675 i915_gem_object_pin_pages(ctx_obj);
1677 /* The second page of the context object contains some fields which must
1678 * be set up prior to the first execution. */
1679 page = i915_gem_object_get_page(ctx_obj, 1);
1680 reg_state = kmap_atomic(page);
1682 /* A context is actually a big batch buffer with several MI_LOAD_REGISTER_IMM
1683 * commands followed by (reg, value) pairs. The values we are setting here are
1684 * only for the first context restore: on a subsequent save, the GPU will
1685 * recreate this batchbuffer with new values (including all the missing
1686 * MI_LOAD_REGISTER_IMM commands that we are not initializing here). */
1687 if (ring->id == RCS)
1688 reg_state[CTX_LRI_HEADER_0] = MI_LOAD_REGISTER_IMM(14);
1690 reg_state[CTX_LRI_HEADER_0] = MI_LOAD_REGISTER_IMM(11);
1691 reg_state[CTX_LRI_HEADER_0] |= MI_LRI_FORCE_POSTED;
1692 reg_state[CTX_CONTEXT_CONTROL] = RING_CONTEXT_CONTROL(ring);
1693 reg_state[CTX_CONTEXT_CONTROL+1] =
1694 _MASKED_BIT_ENABLE((1<<3) | MI_RESTORE_INHIBIT);
1695 reg_state[CTX_RING_HEAD] = RING_HEAD(ring->mmio_base);
1696 reg_state[CTX_RING_HEAD+1] = 0;
1697 reg_state[CTX_RING_TAIL] = RING_TAIL(ring->mmio_base);
1698 reg_state[CTX_RING_TAIL+1] = 0;
1699 reg_state[CTX_RING_BUFFER_START] = RING_START(ring->mmio_base);
1700 /* Ring buffer start address is not known until the buffer is pinned.
1701 * It is written to the context image in execlists_update_context()
1703 reg_state[CTX_RING_BUFFER_CONTROL] = RING_CTL(ring->mmio_base);
1704 reg_state[CTX_RING_BUFFER_CONTROL+1] =
1705 ((ringbuf->size - PAGE_SIZE) & RING_NR_PAGES) | RING_VALID;
1706 reg_state[CTX_BB_HEAD_U] = ring->mmio_base + 0x168;
1707 reg_state[CTX_BB_HEAD_U+1] = 0;
1708 reg_state[CTX_BB_HEAD_L] = ring->mmio_base + 0x140;
1709 reg_state[CTX_BB_HEAD_L+1] = 0;
1710 reg_state[CTX_BB_STATE] = ring->mmio_base + 0x110;
1711 reg_state[CTX_BB_STATE+1] = (1<<5);
1712 reg_state[CTX_SECOND_BB_HEAD_U] = ring->mmio_base + 0x11c;
1713 reg_state[CTX_SECOND_BB_HEAD_U+1] = 0;
1714 reg_state[CTX_SECOND_BB_HEAD_L] = ring->mmio_base + 0x114;
1715 reg_state[CTX_SECOND_BB_HEAD_L+1] = 0;
1716 reg_state[CTX_SECOND_BB_STATE] = ring->mmio_base + 0x118;
1717 reg_state[CTX_SECOND_BB_STATE+1] = 0;
1718 if (ring->id == RCS) {
1719 /* TODO: according to BSpec, the register state context
1720 * for CHV does not have these. OTOH, these registers do
1721 * exist in CHV. I'm waiting for a clarification */
1722 reg_state[CTX_BB_PER_CTX_PTR] = ring->mmio_base + 0x1c0;
1723 reg_state[CTX_BB_PER_CTX_PTR+1] = 0;
1724 reg_state[CTX_RCS_INDIRECT_CTX] = ring->mmio_base + 0x1c4;
1725 reg_state[CTX_RCS_INDIRECT_CTX+1] = 0;
1726 reg_state[CTX_RCS_INDIRECT_CTX_OFFSET] = ring->mmio_base + 0x1c8;
1727 reg_state[CTX_RCS_INDIRECT_CTX_OFFSET+1] = 0;
1729 reg_state[CTX_LRI_HEADER_1] = MI_LOAD_REGISTER_IMM(9);
1730 reg_state[CTX_LRI_HEADER_1] |= MI_LRI_FORCE_POSTED;
1731 reg_state[CTX_CTX_TIMESTAMP] = ring->mmio_base + 0x3a8;
1732 reg_state[CTX_CTX_TIMESTAMP+1] = 0;
1733 reg_state[CTX_PDP3_UDW] = GEN8_RING_PDP_UDW(ring, 3);
1734 reg_state[CTX_PDP3_LDW] = GEN8_RING_PDP_LDW(ring, 3);
1735 reg_state[CTX_PDP2_UDW] = GEN8_RING_PDP_UDW(ring, 2);
1736 reg_state[CTX_PDP2_LDW] = GEN8_RING_PDP_LDW(ring, 2);
1737 reg_state[CTX_PDP1_UDW] = GEN8_RING_PDP_UDW(ring, 1);
1738 reg_state[CTX_PDP1_LDW] = GEN8_RING_PDP_LDW(ring, 1);
1739 reg_state[CTX_PDP0_UDW] = GEN8_RING_PDP_UDW(ring, 0);
1740 reg_state[CTX_PDP0_LDW] = GEN8_RING_PDP_LDW(ring, 0);
1741 reg_state[CTX_PDP3_UDW+1] = upper_32_bits(ppgtt->pd_dma_addr[3]);
1742 reg_state[CTX_PDP3_LDW+1] = lower_32_bits(ppgtt->pd_dma_addr[3]);
1743 reg_state[CTX_PDP2_UDW+1] = upper_32_bits(ppgtt->pd_dma_addr[2]);
1744 reg_state[CTX_PDP2_LDW+1] = lower_32_bits(ppgtt->pd_dma_addr[2]);
1745 reg_state[CTX_PDP1_UDW+1] = upper_32_bits(ppgtt->pd_dma_addr[1]);
1746 reg_state[CTX_PDP1_LDW+1] = lower_32_bits(ppgtt->pd_dma_addr[1]);
1747 reg_state[CTX_PDP0_UDW+1] = upper_32_bits(ppgtt->pd_dma_addr[0]);
1748 reg_state[CTX_PDP0_LDW+1] = lower_32_bits(ppgtt->pd_dma_addr[0]);
1749 if (ring->id == RCS) {
1750 reg_state[CTX_LRI_HEADER_2] = MI_LOAD_REGISTER_IMM(1);
1751 reg_state[CTX_R_PWR_CLK_STATE] = 0x20c8;
1752 reg_state[CTX_R_PWR_CLK_STATE+1] = 0;
1755 kunmap_atomic(reg_state);
1758 set_page_dirty(page);
1759 i915_gem_object_unpin_pages(ctx_obj);
1765 * intel_lr_context_free() - free the LRC specific bits of a context
1766 * @ctx: the LR context to free.
1768 * The real context freeing is done in i915_gem_context_free: this only
1769 * takes care of the bits that are LRC related: the per-engine backing
1770 * objects and the logical ringbuffer.
1772 void intel_lr_context_free(struct intel_context *ctx)
1776 for (i = 0; i < I915_NUM_RINGS; i++) {
1777 struct drm_i915_gem_object *ctx_obj = ctx->engine[i].state;
1780 struct intel_ringbuffer *ringbuf =
1781 ctx->engine[i].ringbuf;
1782 struct intel_engine_cs *ring = ringbuf->ring;
1784 if (ctx == ring->default_context) {
1785 intel_unpin_ringbuffer_obj(ringbuf);
1786 i915_gem_object_ggtt_unpin(ctx_obj);
1788 intel_destroy_ringbuffer_obj(ringbuf);
1790 drm_gem_object_unreference(&ctx_obj->base);
1795 static uint32_t get_lr_context_size(struct intel_engine_cs *ring)
1799 WARN_ON(INTEL_INFO(ring->dev)->gen < 8);
1803 if (INTEL_INFO(ring->dev)->gen >= 9)
1804 ret = GEN9_LR_CONTEXT_RENDER_SIZE;
1806 ret = GEN8_LR_CONTEXT_RENDER_SIZE;
1812 ret = GEN8_LR_CONTEXT_OTHER_SIZE;
1819 static void lrc_setup_hardware_status_page(struct intel_engine_cs *ring,
1820 struct drm_i915_gem_object *default_ctx_obj)
1822 struct drm_i915_private *dev_priv = ring->dev->dev_private;
1824 /* The status page is offset 0 from the default context object
1826 ring->status_page.gfx_addr = i915_gem_obj_ggtt_offset(default_ctx_obj);
1827 ring->status_page.page_addr =
1828 kmap(sg_page(default_ctx_obj->pages->sgl));
1829 ring->status_page.obj = default_ctx_obj;
1831 I915_WRITE(RING_HWS_PGA(ring->mmio_base),
1832 (u32)ring->status_page.gfx_addr);
1833 POSTING_READ(RING_HWS_PGA(ring->mmio_base));
1837 * intel_lr_context_deferred_create() - create the LRC specific bits of a context
1838 * @ctx: LR context to create.
1839 * @ring: engine to be used with the context.
1841 * This function can be called more than once, with different engines, if we plan
1842 * to use the context with them. The context backing objects and the ringbuffers
1843 * (specially the ringbuffer backing objects) suck a lot of memory up, and that's why
1844 * the creation is a deferred call: it's better to make sure first that we need to use
1845 * a given ring with the context.
1847 * Return: non-zero on error.
1849 int intel_lr_context_deferred_create(struct intel_context *ctx,
1850 struct intel_engine_cs *ring)
1852 const bool is_global_default_ctx = (ctx == ring->default_context);
1853 struct drm_device *dev = ring->dev;
1854 struct drm_i915_gem_object *ctx_obj;
1855 uint32_t context_size;
1856 struct intel_ringbuffer *ringbuf;
1859 WARN_ON(ctx->legacy_hw_ctx.rcs_state != NULL);
1860 if (ctx->engine[ring->id].state)
1863 context_size = round_up(get_lr_context_size(ring), 4096);
1865 ctx_obj = i915_gem_alloc_context_obj(dev, context_size);
1866 if (IS_ERR(ctx_obj)) {
1867 ret = PTR_ERR(ctx_obj);
1868 DRM_DEBUG_DRIVER("Alloc LRC backing obj failed: %d\n", ret);
1872 if (is_global_default_ctx) {
1873 ret = i915_gem_obj_ggtt_pin(ctx_obj, GEN8_LR_CONTEXT_ALIGN, 0);
1875 DRM_DEBUG_DRIVER("Pin LRC backing obj failed: %d\n",
1877 drm_gem_object_unreference(&ctx_obj->base);
1882 ringbuf = kzalloc(sizeof(*ringbuf), GFP_KERNEL);
1884 DRM_DEBUG_DRIVER("Failed to allocate ringbuffer %s\n",
1887 goto error_unpin_ctx;
1890 ringbuf->ring = ring;
1891 ringbuf->FIXME_lrc_ctx = ctx;
1893 ringbuf->size = 32 * PAGE_SIZE;
1894 ringbuf->effective_size = ringbuf->size;
1897 ringbuf->space = ringbuf->size;
1898 ringbuf->last_retired_head = -1;
1900 if (ringbuf->obj == NULL) {
1901 ret = intel_alloc_ringbuffer_obj(dev, ringbuf);
1904 "Failed to allocate ringbuffer obj %s: %d\n",
1906 goto error_free_rbuf;
1909 if (is_global_default_ctx) {
1910 ret = intel_pin_and_map_ringbuffer_obj(dev, ringbuf);
1913 "Failed to pin and map ringbuffer %s: %d\n",
1915 goto error_destroy_rbuf;
1921 ret = populate_lr_context(ctx, ctx_obj, ring, ringbuf);
1923 DRM_DEBUG_DRIVER("Failed to populate LRC: %d\n", ret);
1927 ctx->engine[ring->id].ringbuf = ringbuf;
1928 ctx->engine[ring->id].state = ctx_obj;
1930 if (ctx == ring->default_context)
1931 lrc_setup_hardware_status_page(ring, ctx_obj);
1933 if (ring->id == RCS && !ctx->rcs_initialized) {
1934 if (ring->init_context) {
1935 ret = ring->init_context(ring, ctx);
1937 DRM_ERROR("ring init context: %d\n", ret);
1940 ret = intel_lr_context_render_state_init(ring, ctx);
1942 DRM_ERROR("Init render state failed: %d\n", ret);
1943 ctx->engine[ring->id].ringbuf = NULL;
1944 ctx->engine[ring->id].state = NULL;
1947 ctx->rcs_initialized = true;
1953 if (is_global_default_ctx)
1954 intel_unpin_ringbuffer_obj(ringbuf);
1956 intel_destroy_ringbuffer_obj(ringbuf);
1960 if (is_global_default_ctx)
1961 i915_gem_object_ggtt_unpin(ctx_obj);
1962 drm_gem_object_unreference(&ctx_obj->base);