/* * Copyright © 2014 Intel Corporation * * Permission is hereby granted, free of charge, to any person obtaining a * copy of this software and associated documentation files (the "Software"), * to deal in the Software without restriction, including without limitation * the rights to use, copy, modify, merge, publish, distribute, sublicense, * and/or sell copies of the Software, and to permit persons to whom the * Software is furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice (including the next * paragraph) shall be included in all copies or substantial portions of the * Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS * IN THE SOFTWARE. * * Authors: * Ben Widawsky * Michel Thierry * Thomas Daniel * Oscar Mateo * */ /** * DOC: Logical Rings, Logical Ring Contexts and Execlists * * Motivation: * GEN8 brings an expansion of the HW contexts: "Logical Ring Contexts". * These expanded contexts enable a number of new abilities, especially * "Execlists" (also implemented in this file). * * One of the main differences with the legacy HW contexts is that logical * ring contexts incorporate many more things to the context's state, like * PDPs or ringbuffer control registers: * * The reason why PDPs are included in the context is straightforward: as * PPGTTs (per-process GTTs) are actually per-context, having the PDPs * contained there mean you don't need to do a ppgtt->switch_mm yourself, * instead, the GPU will do it for you on the context switch. * * But, what about the ringbuffer control registers (head, tail, etc..)? * shouldn't we just need a set of those per engine command streamer? This is * where the name "Logical Rings" starts to make sense: by virtualizing the * rings, the engine cs shifts to a new "ring buffer" with every context * switch. When you want to submit a workload to the GPU you: A) choose your * context, B) find its appropriate virtualized ring, C) write commands to it * and then, finally, D) tell the GPU to switch to that context. * * Instead of the legacy MI_SET_CONTEXT, the way you tell the GPU to switch * to a contexts is via a context execution list, ergo "Execlists". * * LRC implementation: * Regarding the creation of contexts, we have: * * - One global default context. * - One local default context for each opened fd. * - One local extra context for each context create ioctl call. * * Now that ringbuffers belong per-context (and not per-engine, like before) * and that contexts are uniquely tied to a given engine (and not reusable, * like before) we need: * * - One ringbuffer per-engine inside each context. * - One backing object per-engine inside each context. * * The global default context starts its life with these new objects fully * allocated and populated. The local default context for each opened fd is * more complex, because we don't know at creation time which engine is going * to use them. To handle this, we have implemented a deferred creation of LR * contexts: * * The local context starts its life as a hollow or blank holder, that only * gets populated for a given engine once we receive an execbuffer. If later * on we receive another execbuffer ioctl for the same context but a different * engine, we allocate/populate a new ringbuffer and context backing object and * so on. * * Finally, regarding local contexts created using the ioctl call: as they are * only allowed with the render ring, we can allocate & populate them right * away (no need to defer anything, at least for now). * * Execlists implementation: * Execlists are the new method by which, on gen8+ hardware, workloads are * submitted for execution (as opposed to the legacy, ringbuffer-based, method). * This method works as follows: * * When a request is committed, its commands (the BB start and any leading or * trailing commands, like the seqno breadcrumbs) are placed in the ringbuffer * for the appropriate context. The tail pointer in the hardware context is not * updated at this time, but instead, kept by the driver in the ringbuffer * structure. A structure representing this request is added to a request queue * for the appropriate engine: this structure contains a copy of the context's * tail after the request was written to the ring buffer and a pointer to the * context itself. * * If the engine's request queue was empty before the request was added, the * queue is processed immediately. Otherwise the queue will be processed during * a context switch interrupt. In any case, elements on the queue will get sent * (in pairs) to the GPU's ExecLists Submit Port (ELSP, for short) with a * globally unique 20-bits submission ID. * * When execution of a request completes, the GPU updates the context status * buffer with a context complete event and generates a context switch interrupt. * During the interrupt handling, the driver examines the events in the buffer: * for each context complete event, if the announced ID matches that on the head * of the request queue, then that request is retired and removed from the queue. * * After processing, if any requests were retired and the queue is not empty * then a new execution list can be submitted. The two requests at the front of * the queue are next to be submitted but since a context may not occur twice in * an execution list, if subsequent requests have the same ID as the first then * the two requests must be combined. This is done simply by discarding requests * at the head of the queue until either only one requests is left (in which case * we use a NULL second context) or the first two requests have unique IDs. * * By always executing the first two requests in the queue the driver ensures * that the GPU is kept as busy as possible. In the case where a single context * completes but a second context is still executing, the request for this second * context will be at the head of the queue when we remove the first one. This * request will then be resubmitted along with a new request for a different context, * which will cause the hardware to continue executing the second request and queue * the new request (the GPU detects the condition of a context getting preempted * with the same context and optimizes the context switch flow by not doing * preemption, but just sampling the new tail pointer). * */ #include #include #include "i915_drv.h" #define GEN9_LR_CONTEXT_RENDER_SIZE (22 * PAGE_SIZE) #define GEN8_LR_CONTEXT_RENDER_SIZE (20 * PAGE_SIZE) #define GEN8_LR_CONTEXT_OTHER_SIZE (2 * PAGE_SIZE) #define RING_EXECLIST_QFULL (1 << 0x2) #define RING_EXECLIST1_VALID (1 << 0x3) #define RING_EXECLIST0_VALID (1 << 0x4) #define RING_EXECLIST_ACTIVE_STATUS (3 << 0xE) #define RING_EXECLIST1_ACTIVE (1 << 0x11) #define RING_EXECLIST0_ACTIVE (1 << 0x12) #define GEN8_CTX_STATUS_IDLE_ACTIVE (1 << 0) #define GEN8_CTX_STATUS_PREEMPTED (1 << 1) #define GEN8_CTX_STATUS_ELEMENT_SWITCH (1 << 2) #define GEN8_CTX_STATUS_ACTIVE_IDLE (1 << 3) #define GEN8_CTX_STATUS_COMPLETE (1 << 4) #define GEN8_CTX_STATUS_LITE_RESTORE (1 << 15) #define CTX_LRI_HEADER_0 0x01 #define CTX_CONTEXT_CONTROL 0x02 #define CTX_RING_HEAD 0x04 #define CTX_RING_TAIL 0x06 #define CTX_RING_BUFFER_START 0x08 #define CTX_RING_BUFFER_CONTROL 0x0a #define CTX_BB_HEAD_U 0x0c #define CTX_BB_HEAD_L 0x0e #define CTX_BB_STATE 0x10 #define CTX_SECOND_BB_HEAD_U 0x12 #define CTX_SECOND_BB_HEAD_L 0x14 #define CTX_SECOND_BB_STATE 0x16 #define CTX_BB_PER_CTX_PTR 0x18 #define CTX_RCS_INDIRECT_CTX 0x1a #define CTX_RCS_INDIRECT_CTX_OFFSET 0x1c #define CTX_LRI_HEADER_1 0x21 #define CTX_CTX_TIMESTAMP 0x22 #define CTX_PDP3_UDW 0x24 #define CTX_PDP3_LDW 0x26 #define CTX_PDP2_UDW 0x28 #define CTX_PDP2_LDW 0x2a #define CTX_PDP1_UDW 0x2c #define CTX_PDP1_LDW 0x2e #define CTX_PDP0_UDW 0x30 #define CTX_PDP0_LDW 0x32 #define CTX_LRI_HEADER_2 0x41 #define CTX_R_PWR_CLK_STATE 0x42 #define CTX_GPGPU_CSR_BASE_ADDRESS 0x44 #define GEN8_CTX_VALID (1<<0) #define GEN8_CTX_FORCE_PD_RESTORE (1<<1) #define GEN8_CTX_FORCE_RESTORE (1<<2) #define GEN8_CTX_L3LLC_COHERENT (1<<5) #define GEN8_CTX_PRIVILEGE (1<<8) enum { ADVANCED_CONTEXT = 0, LEGACY_CONTEXT, ADVANCED_AD_CONTEXT, LEGACY_64B_CONTEXT }; #define GEN8_CTX_MODE_SHIFT 3 enum { FAULT_AND_HANG = 0, FAULT_AND_HALT, /* Debug only */ FAULT_AND_STREAM, FAULT_AND_CONTINUE /* Unsupported */ }; #define GEN8_CTX_ID_SHIFT 32 static int intel_lr_context_pin(struct intel_engine_cs *ring, struct intel_context *ctx); /** * intel_sanitize_enable_execlists() - sanitize i915.enable_execlists * @dev: DRM device. * @enable_execlists: value of i915.enable_execlists module parameter. * * Only certain platforms support Execlists (the prerequisites being * support for Logical Ring Contexts and Aliasing PPGTT or better). * * Return: 1 if Execlists is supported and has to be enabled. */ int intel_sanitize_enable_execlists(struct drm_device *dev, int enable_execlists) { WARN_ON(i915.enable_ppgtt == -1); if (INTEL_INFO(dev)->gen >= 9) return 1; if (enable_execlists == 0) return 0; if (HAS_LOGICAL_RING_CONTEXTS(dev) && USES_PPGTT(dev) && i915.use_mmio_flip >= 0) return 1; return 0; } /** * intel_execlists_ctx_id() - get the Execlists Context ID * @ctx_obj: Logical Ring Context backing object. * * Do not confuse with ctx->id! Unfortunately we have a name overload * here: the old context ID we pass to userspace as a handler so that * they can refer to a context, and the new context ID we pass to the * ELSP so that the GPU can inform us of the context status via * interrupts. * * Return: 20-bits globally unique context ID. */ u32 intel_execlists_ctx_id(struct drm_i915_gem_object *ctx_obj) { u32 lrca = i915_gem_obj_ggtt_offset(ctx_obj); /* LRCA is required to be 4K aligned so the more significant 20 bits * are globally unique */ return lrca >> 12; } static uint64_t execlists_ctx_descriptor(struct intel_engine_cs *ring, struct drm_i915_gem_object *ctx_obj) { struct drm_device *dev = ring->dev; uint64_t desc; uint64_t lrca = i915_gem_obj_ggtt_offset(ctx_obj); WARN_ON(lrca & 0xFFFFFFFF00000FFFULL); desc = GEN8_CTX_VALID; desc |= LEGACY_CONTEXT << GEN8_CTX_MODE_SHIFT; desc |= GEN8_CTX_L3LLC_COHERENT; desc |= GEN8_CTX_PRIVILEGE; desc |= lrca; desc |= (u64)intel_execlists_ctx_id(ctx_obj) << GEN8_CTX_ID_SHIFT; /* TODO: WaDisableLiteRestore when we start using semaphore * signalling between Command Streamers */ /* desc |= GEN8_CTX_FORCE_RESTORE; */ /* WaEnableForceRestoreInCtxtDescForVCS:skl */ if (IS_GEN9(dev) && INTEL_REVID(dev) <= SKL_REVID_B0 && (ring->id == BCS || ring->id == VCS || ring->id == VECS || ring->id == VCS2)) desc |= GEN8_CTX_FORCE_RESTORE; return desc; } static void execlists_elsp_write(struct intel_engine_cs *ring, struct drm_i915_gem_object *ctx_obj0, struct drm_i915_gem_object *ctx_obj1) { struct drm_device *dev = ring->dev; struct drm_i915_private *dev_priv = dev->dev_private; uint64_t temp = 0; uint32_t desc[4]; /* XXX: You must always write both descriptors in the order below. */ if (ctx_obj1) temp = execlists_ctx_descriptor(ring, ctx_obj1); else temp = 0; desc[1] = (u32)(temp >> 32); desc[0] = (u32)temp; temp = execlists_ctx_descriptor(ring, ctx_obj0); desc[3] = (u32)(temp >> 32); desc[2] = (u32)temp; intel_uncore_forcewake_get(dev_priv, FORCEWAKE_ALL); I915_WRITE(RING_ELSP(ring), desc[1]); I915_WRITE(RING_ELSP(ring), desc[0]); I915_WRITE(RING_ELSP(ring), desc[3]); /* The context is automatically loaded after the following */ I915_WRITE(RING_ELSP(ring), desc[2]); /* ELSP is a wo register, so use another nearby reg for posting instead */ POSTING_READ(RING_EXECLIST_STATUS(ring)); intel_uncore_forcewake_put(dev_priv, FORCEWAKE_ALL); } static int execlists_update_context(struct drm_i915_gem_object *ctx_obj, struct drm_i915_gem_object *ring_obj, u32 tail) { struct page *page; uint32_t *reg_state; page = i915_gem_object_get_page(ctx_obj, 1); reg_state = kmap_atomic(page); reg_state[CTX_RING_TAIL+1] = tail; reg_state[CTX_RING_BUFFER_START+1] = i915_gem_obj_ggtt_offset(ring_obj); kunmap_atomic(reg_state); return 0; } static void execlists_submit_contexts(struct intel_engine_cs *ring, struct intel_context *to0, u32 tail0, struct intel_context *to1, u32 tail1) { struct drm_i915_gem_object *ctx_obj0 = to0->engine[ring->id].state; struct intel_ringbuffer *ringbuf0 = to0->engine[ring->id].ringbuf; struct drm_i915_gem_object *ctx_obj1 = NULL; struct intel_ringbuffer *ringbuf1 = NULL; BUG_ON(!ctx_obj0); WARN_ON(!i915_gem_obj_is_pinned(ctx_obj0)); WARN_ON(!i915_gem_obj_is_pinned(ringbuf0->obj)); execlists_update_context(ctx_obj0, ringbuf0->obj, tail0); if (to1) { ringbuf1 = to1->engine[ring->id].ringbuf; ctx_obj1 = to1->engine[ring->id].state; BUG_ON(!ctx_obj1); WARN_ON(!i915_gem_obj_is_pinned(ctx_obj1)); WARN_ON(!i915_gem_obj_is_pinned(ringbuf1->obj)); execlists_update_context(ctx_obj1, ringbuf1->obj, tail1); } execlists_elsp_write(ring, ctx_obj0, ctx_obj1); } static void execlists_context_unqueue(struct intel_engine_cs *ring) { struct drm_i915_gem_request *req0 = NULL, *req1 = NULL; struct drm_i915_gem_request *cursor = NULL, *tmp = NULL; assert_spin_locked(&ring->execlist_lock); if (list_empty(&ring->execlist_queue)) return; /* Try to read in pairs */ list_for_each_entry_safe(cursor, tmp, &ring->execlist_queue, execlist_link) { if (!req0) { req0 = cursor; } else if (req0->ctx == cursor->ctx) { /* Same ctx: ignore first request, as second request * will update tail past first request's workload */ cursor->elsp_submitted = req0->elsp_submitted; list_del(&req0->execlist_link); list_add_tail(&req0->execlist_link, &ring->execlist_retired_req_list); req0 = cursor; } else { req1 = cursor; break; } } if (IS_GEN8(ring->dev) || IS_GEN9(ring->dev)) { /* * WaIdleLiteRestore: make sure we never cause a lite * restore with HEAD==TAIL */ if (req0 && req0->elsp_submitted) { /* * Apply the wa NOOPS to prevent ring:HEAD == req:TAIL * as we resubmit the request. See gen8_emit_request() * for where we prepare the padding after the end of the * request. */ struct intel_ringbuffer *ringbuf; ringbuf = req0->ctx->engine[ring->id].ringbuf; req0->tail += 8; req0->tail &= ringbuf->size - 1; } } WARN_ON(req1 && req1->elsp_submitted); execlists_submit_contexts(ring, req0->ctx, req0->tail, req1 ? req1->ctx : NULL, req1 ? req1->tail : 0); req0->elsp_submitted++; if (req1) req1->elsp_submitted++; } static bool execlists_check_remove_request(struct intel_engine_cs *ring, u32 request_id) { struct drm_i915_gem_request *head_req; assert_spin_locked(&ring->execlist_lock); head_req = list_first_entry_or_null(&ring->execlist_queue, struct drm_i915_gem_request, execlist_link); if (head_req != NULL) { struct drm_i915_gem_object *ctx_obj = head_req->ctx->engine[ring->id].state; if (intel_execlists_ctx_id(ctx_obj) == request_id) { WARN(head_req->elsp_submitted == 0, "Never submitted head request\n"); if (--head_req->elsp_submitted <= 0) { list_del(&head_req->execlist_link); list_add_tail(&head_req->execlist_link, &ring->execlist_retired_req_list); return true; } } } return false; } /** * intel_lrc_irq_handler() - handle Context Switch interrupts * @ring: Engine Command Streamer to handle. * * Check the unread Context Status Buffers and manage the submission of new * contexts to the ELSP accordingly. */ void intel_lrc_irq_handler(struct intel_engine_cs *ring) { struct drm_i915_private *dev_priv = ring->dev->dev_private; u32 status_pointer; u8 read_pointer; u8 write_pointer; u32 status; u32 status_id; u32 submit_contexts = 0; status_pointer = I915_READ(RING_CONTEXT_STATUS_PTR(ring)); read_pointer = ring->next_context_status_buffer; write_pointer = status_pointer & 0x07; if (read_pointer > write_pointer) write_pointer += 6; spin_lock(&ring->execlist_lock); while (read_pointer < write_pointer) { read_pointer++; status = I915_READ(RING_CONTEXT_STATUS_BUF(ring) + (read_pointer % 6) * 8); status_id = I915_READ(RING_CONTEXT_STATUS_BUF(ring) + (read_pointer % 6) * 8 + 4); if (status & GEN8_CTX_STATUS_PREEMPTED) { if (status & GEN8_CTX_STATUS_LITE_RESTORE) { if (execlists_check_remove_request(ring, status_id)) WARN(1, "Lite Restored request removed from queue\n"); } else WARN(1, "Preemption without Lite Restore\n"); } if ((status & GEN8_CTX_STATUS_ACTIVE_IDLE) || (status & GEN8_CTX_STATUS_ELEMENT_SWITCH)) { if (execlists_check_remove_request(ring, status_id)) submit_contexts++; } } if (submit_contexts != 0) execlists_context_unqueue(ring); spin_unlock(&ring->execlist_lock); WARN(submit_contexts > 2, "More than two context complete events?\n"); ring->next_context_status_buffer = write_pointer % 6; I915_WRITE(RING_CONTEXT_STATUS_PTR(ring), ((u32)ring->next_context_status_buffer & 0x07) << 8); } static int execlists_context_queue(struct intel_engine_cs *ring, struct intel_context *to, u32 tail, struct drm_i915_gem_request *request) { struct drm_i915_gem_request *cursor; struct drm_i915_private *dev_priv = ring->dev->dev_private; unsigned long flags; int num_elements = 0; if (to != ring->default_context) intel_lr_context_pin(ring, to); if (!request) { /* * If there isn't a request associated with this submission, * create one as a temporary holder. */ request = kzalloc(sizeof(*request), GFP_KERNEL); if (request == NULL) return -ENOMEM; request->ring = ring; request->ctx = to; kref_init(&request->ref); request->uniq = dev_priv->request_uniq++; i915_gem_context_reference(request->ctx); } else { i915_gem_request_reference(request); WARN_ON(to != request->ctx); } request->tail = tail; intel_runtime_pm_get(dev_priv); spin_lock_irqsave(&ring->execlist_lock, flags); list_for_each_entry(cursor, &ring->execlist_queue, execlist_link) if (++num_elements > 2) break; if (num_elements > 2) { struct drm_i915_gem_request *tail_req; tail_req = list_last_entry(&ring->execlist_queue, struct drm_i915_gem_request, execlist_link); if (to == tail_req->ctx) { WARN(tail_req->elsp_submitted != 0, "More than 2 already-submitted reqs queued\n"); list_del(&tail_req->execlist_link); list_add_tail(&tail_req->execlist_link, &ring->execlist_retired_req_list); } } list_add_tail(&request->execlist_link, &ring->execlist_queue); if (num_elements == 0) execlists_context_unqueue(ring); spin_unlock_irqrestore(&ring->execlist_lock, flags); return 0; } static int logical_ring_invalidate_all_caches(struct intel_ringbuffer *ringbuf, struct intel_context *ctx) { struct intel_engine_cs *ring = ringbuf->ring; uint32_t flush_domains; int ret; flush_domains = 0; if (ring->gpu_caches_dirty) flush_domains = I915_GEM_GPU_DOMAINS; ret = ring->emit_flush(ringbuf, ctx, I915_GEM_GPU_DOMAINS, flush_domains); if (ret) return ret; ring->gpu_caches_dirty = false; return 0; } static int execlists_move_to_gpu(struct intel_ringbuffer *ringbuf, struct intel_context *ctx, struct list_head *vmas) { struct intel_engine_cs *ring = ringbuf->ring; struct i915_vma *vma; uint32_t flush_domains = 0; bool flush_chipset = false; int ret; list_for_each_entry(vma, vmas, exec_list) { struct drm_i915_gem_object *obj = vma->obj; ret = i915_gem_object_sync(obj, ring); if (ret) return ret; if (obj->base.write_domain & I915_GEM_DOMAIN_CPU) flush_chipset |= i915_gem_clflush_object(obj, false); flush_domains |= obj->base.write_domain; } if (flush_domains & I915_GEM_DOMAIN_GTT) wmb(); /* Unconditionally invalidate gpu caches and ensure that we do flush * any residual writes from the previous batch. */ return logical_ring_invalidate_all_caches(ringbuf, ctx); } /** * execlists_submission() - submit a batchbuffer for execution, Execlists style * @dev: DRM device. * @file: DRM file. * @ring: Engine Command Streamer to submit to. * @ctx: Context to employ for this submission. * @args: execbuffer call arguments. * @vmas: list of vmas. * @batch_obj: the batchbuffer to submit. * @exec_start: batchbuffer start virtual address pointer. * @dispatch_flags: translated execbuffer call flags. * * This is the evil twin version of i915_gem_ringbuffer_submission. It abstracts * away the submission details of the execbuffer ioctl call. * * Return: non-zero if the submission fails. */ int intel_execlists_submission(struct drm_device *dev, struct drm_file *file, struct intel_engine_cs *ring, struct intel_context *ctx, struct drm_i915_gem_execbuffer2 *args, struct list_head *vmas, struct drm_i915_gem_object *batch_obj, u64 exec_start, u32 dispatch_flags) { struct drm_i915_private *dev_priv = dev->dev_private; struct intel_ringbuffer *ringbuf = ctx->engine[ring->id].ringbuf; int instp_mode; u32 instp_mask; int ret; instp_mode = args->flags & I915_EXEC_CONSTANTS_MASK; instp_mask = I915_EXEC_CONSTANTS_MASK; switch (instp_mode) { case I915_EXEC_CONSTANTS_REL_GENERAL: case I915_EXEC_CONSTANTS_ABSOLUTE: case I915_EXEC_CONSTANTS_REL_SURFACE: if (instp_mode != 0 && ring != &dev_priv->ring[RCS]) { DRM_DEBUG("non-0 rel constants mode on non-RCS\n"); return -EINVAL; } if (instp_mode != dev_priv->relative_constants_mode) { if (instp_mode == I915_EXEC_CONSTANTS_REL_SURFACE) { DRM_DEBUG("rel surface constants mode invalid on gen5+\n"); return -EINVAL; } /* The HW changed the meaning on this bit on gen6 */ instp_mask &= ~I915_EXEC_CONSTANTS_REL_SURFACE; } break; default: DRM_DEBUG("execbuf with unknown constants: %d\n", instp_mode); return -EINVAL; } if (args->num_cliprects != 0) { DRM_DEBUG("clip rectangles are only valid on pre-gen5\n"); return -EINVAL; } else { if (args->DR4 == 0xffffffff) { DRM_DEBUG("UXA submitting garbage DR4, fixing up\n"); args->DR4 = 0; } if (args->DR1 || args->DR4 || args->cliprects_ptr) { DRM_DEBUG("0 cliprects but dirt in cliprects fields\n"); return -EINVAL; } } if (args->flags & I915_EXEC_GEN7_SOL_RESET) { DRM_DEBUG("sol reset is gen7 only\n"); return -EINVAL; } ret = execlists_move_to_gpu(ringbuf, ctx, vmas); if (ret) return ret; if (ring == &dev_priv->ring[RCS] && instp_mode != dev_priv->relative_constants_mode) { ret = intel_logical_ring_begin(ringbuf, ctx, 4); if (ret) return ret; intel_logical_ring_emit(ringbuf, MI_NOOP); intel_logical_ring_emit(ringbuf, MI_LOAD_REGISTER_IMM(1)); intel_logical_ring_emit(ringbuf, INSTPM); intel_logical_ring_emit(ringbuf, instp_mask << 16 | instp_mode); intel_logical_ring_advance(ringbuf); dev_priv->relative_constants_mode = instp_mode; } ret = ring->emit_bb_start(ringbuf, ctx, exec_start, dispatch_flags); if (ret) return ret; trace_i915_gem_ring_dispatch(intel_ring_get_request(ring), dispatch_flags); i915_gem_execbuffer_move_to_active(vmas, ring); i915_gem_execbuffer_retire_commands(dev, file, ring, batch_obj); return 0; } void intel_execlists_retire_requests(struct intel_engine_cs *ring) { struct drm_i915_gem_request *req, *tmp; struct drm_i915_private *dev_priv = ring->dev->dev_private; unsigned long flags; struct list_head retired_list; WARN_ON(!mutex_is_locked(&ring->dev->struct_mutex)); if (list_empty(&ring->execlist_retired_req_list)) return; INIT_LIST_HEAD(&retired_list); spin_lock_irqsave(&ring->execlist_lock, flags); list_replace_init(&ring->execlist_retired_req_list, &retired_list); spin_unlock_irqrestore(&ring->execlist_lock, flags); list_for_each_entry_safe(req, tmp, &retired_list, execlist_link) { struct intel_context *ctx = req->ctx; struct drm_i915_gem_object *ctx_obj = ctx->engine[ring->id].state; if (ctx_obj && (ctx != ring->default_context)) intel_lr_context_unpin(ring, ctx); intel_runtime_pm_put(dev_priv); list_del(&req->execlist_link); i915_gem_request_unreference(req); } } void intel_logical_ring_stop(struct intel_engine_cs *ring) { struct drm_i915_private *dev_priv = ring->dev->dev_private; int ret; if (!intel_ring_initialized(ring)) return; ret = intel_ring_idle(ring); if (ret && !i915_reset_in_progress(&to_i915(ring->dev)->gpu_error)) DRM_ERROR("failed to quiesce %s whilst cleaning up: %d\n", ring->name, ret); /* TODO: Is this correct with Execlists enabled? */ I915_WRITE_MODE(ring, _MASKED_BIT_ENABLE(STOP_RING)); if (wait_for_atomic((I915_READ_MODE(ring) & MODE_IDLE) != 0, 1000)) { DRM_ERROR("%s :timed out trying to stop ring\n", ring->name); return; } I915_WRITE_MODE(ring, _MASKED_BIT_DISABLE(STOP_RING)); } int logical_ring_flush_all_caches(struct intel_ringbuffer *ringbuf, struct intel_context *ctx) { struct intel_engine_cs *ring = ringbuf->ring; int ret; if (!ring->gpu_caches_dirty) return 0; ret = ring->emit_flush(ringbuf, ctx, 0, I915_GEM_GPU_DOMAINS); if (ret) return ret; ring->gpu_caches_dirty = false; return 0; } /* * intel_logical_ring_advance_and_submit() - advance the tail and submit the workload * @ringbuf: Logical Ringbuffer to advance. * * The tail is updated in our logical ringbuffer struct, not in the actual context. What * really happens during submission is that the context and current tail will be placed * on a queue waiting for the ELSP to be ready to accept a new context submission. At that * point, the tail *inside* the context is updated and the ELSP written to. */ static void intel_logical_ring_advance_and_submit(struct intel_ringbuffer *ringbuf, struct intel_context *ctx, struct drm_i915_gem_request *request) { struct intel_engine_cs *ring = ringbuf->ring; intel_logical_ring_advance(ringbuf); if (intel_ring_stopped(ring)) return; execlists_context_queue(ring, ctx, ringbuf->tail, request); } static int intel_lr_context_pin(struct intel_engine_cs *ring, struct intel_context *ctx) { struct drm_i915_gem_object *ctx_obj = ctx->engine[ring->id].state; struct intel_ringbuffer *ringbuf = ctx->engine[ring->id].ringbuf; int ret = 0; WARN_ON(!mutex_is_locked(&ring->dev->struct_mutex)); if (ctx->engine[ring->id].pin_count++ == 0) { ret = i915_gem_obj_ggtt_pin(ctx_obj, GEN8_LR_CONTEXT_ALIGN, 0); if (ret) goto reset_pin_count; ret = intel_pin_and_map_ringbuffer_obj(ring->dev, ringbuf); if (ret) goto unpin_ctx_obj; ctx_obj->dirty = true; } return ret; unpin_ctx_obj: i915_gem_object_ggtt_unpin(ctx_obj); reset_pin_count: ctx->engine[ring->id].pin_count = 0; return ret; } void intel_lr_context_unpin(struct intel_engine_cs *ring, struct intel_context *ctx) { struct drm_i915_gem_object *ctx_obj = ctx->engine[ring->id].state; struct intel_ringbuffer *ringbuf = ctx->engine[ring->id].ringbuf; if (ctx_obj) { WARN_ON(!mutex_is_locked(&ring->dev->struct_mutex)); if (--ctx->engine[ring->id].pin_count == 0) { intel_unpin_ringbuffer_obj(ringbuf); i915_gem_object_ggtt_unpin(ctx_obj); } } } static int logical_ring_alloc_request(struct intel_engine_cs *ring, struct intel_context *ctx) { struct drm_i915_gem_request *request; struct drm_i915_private *dev_private = ring->dev->dev_private; int ret; if (ring->outstanding_lazy_request) return 0; request = kzalloc(sizeof(*request), GFP_KERNEL); if (request == NULL) return -ENOMEM; if (ctx != ring->default_context) { ret = intel_lr_context_pin(ring, ctx); if (ret) { kfree(request); return ret; } } kref_init(&request->ref); request->ring = ring; request->uniq = dev_private->request_uniq++; ret = i915_gem_get_seqno(ring->dev, &request->seqno); if (ret) { intel_lr_context_unpin(ring, ctx); kfree(request); return ret; } request->ctx = ctx; i915_gem_context_reference(request->ctx); request->ringbuf = ctx->engine[ring->id].ringbuf; ring->outstanding_lazy_request = request; return 0; } static int logical_ring_wait_request(struct intel_ringbuffer *ringbuf, int bytes) { struct intel_engine_cs *ring = ringbuf->ring; struct drm_i915_gem_request *request; int ret; if (intel_ring_space(ringbuf) >= bytes) return 0; list_for_each_entry(request, &ring->request_list, list) { /* * The request queue is per-engine, so can contain requests * from multiple ringbuffers. Here, we must ignore any that * aren't from the ringbuffer we're considering. */ struct intel_context *ctx = request->ctx; if (ctx->engine[ring->id].ringbuf != ringbuf) continue; /* Would completion of this request free enough space? */ if (__intel_ring_space(request->tail, ringbuf->tail, ringbuf->size) >= bytes) { break; } } if (&request->list == &ring->request_list) return -ENOSPC; ret = i915_wait_request(request); if (ret) return ret; i915_gem_retire_requests_ring(ring); return intel_ring_space(ringbuf) >= bytes ? 0 : -ENOSPC; } static int logical_ring_wait_for_space(struct intel_ringbuffer *ringbuf, struct intel_context *ctx, int bytes) { struct intel_engine_cs *ring = ringbuf->ring; struct drm_device *dev = ring->dev; struct drm_i915_private *dev_priv = dev->dev_private; unsigned long end; int ret; ret = logical_ring_wait_request(ringbuf, bytes); if (ret != -ENOSPC) return ret; /* Force the context submission in case we have been skipping it */ intel_logical_ring_advance_and_submit(ringbuf, ctx, NULL); /* With GEM the hangcheck timer should kick us out of the loop, * leaving it early runs the risk of corrupting GEM state (due * to running on almost untested codepaths). But on resume * timers don't work yet, so prevent a complete hang in that * case by choosing an insanely large timeout. */ end = jiffies + 60 * HZ; ret = 0; do { if (intel_ring_space(ringbuf) >= bytes) break; msleep(1); if (dev_priv->mm.interruptible && signal_pending(current)) { ret = -ERESTARTSYS; break; } ret = i915_gem_check_wedge(&dev_priv->gpu_error, dev_priv->mm.interruptible); if (ret) break; if (time_after(jiffies, end)) { ret = -EBUSY; break; } } while (1); return ret; } static int logical_ring_wrap_buffer(struct intel_ringbuffer *ringbuf, struct intel_context *ctx) { uint32_t __iomem *virt; int rem = ringbuf->size - ringbuf->tail; if (ringbuf->space < rem) { int ret = logical_ring_wait_for_space(ringbuf, ctx, rem); if (ret) return ret; } virt = ringbuf->virtual_start + ringbuf->tail; rem /= 4; while (rem--) iowrite32(MI_NOOP, virt++); ringbuf->tail = 0; intel_ring_update_space(ringbuf); return 0; } static int logical_ring_prepare(struct intel_ringbuffer *ringbuf, struct intel_context *ctx, int bytes) { int ret; if (unlikely(ringbuf->tail + bytes > ringbuf->effective_size)) { ret = logical_ring_wrap_buffer(ringbuf, ctx); if (unlikely(ret)) return ret; } if (unlikely(ringbuf->space < bytes)) { ret = logical_ring_wait_for_space(ringbuf, ctx, bytes); if (unlikely(ret)) return ret; } return 0; } /** * intel_logical_ring_begin() - prepare the logical ringbuffer to accept some commands * * @ringbuf: Logical ringbuffer. * @num_dwords: number of DWORDs that we plan to write to the ringbuffer. * * The ringbuffer might not be ready to accept the commands right away (maybe it needs to * be wrapped, or wait a bit for the tail to be updated). This function takes care of that * and also preallocates a request (every workload submission is still mediated through * requests, same as it did with legacy ringbuffer submission). * * Return: non-zero if the ringbuffer is not ready to be written to. */ int intel_logical_ring_begin(struct intel_ringbuffer *ringbuf, struct intel_context *ctx, int num_dwords) { struct intel_engine_cs *ring = ringbuf->ring; struct drm_device *dev = ring->dev; struct drm_i915_private *dev_priv = dev->dev_private; int ret; ret = i915_gem_check_wedge(&dev_priv->gpu_error, dev_priv->mm.interruptible); if (ret) return ret; ret = logical_ring_prepare(ringbuf, ctx, num_dwords * sizeof(uint32_t)); if (ret) return ret; /* Preallocate the olr before touching the ring */ ret = logical_ring_alloc_request(ring, ctx); if (ret) return ret; ringbuf->space -= num_dwords * sizeof(uint32_t); return 0; } static int intel_logical_ring_workarounds_emit(struct intel_engine_cs *ring, struct intel_context *ctx) { int ret, i; struct intel_ringbuffer *ringbuf = ctx->engine[ring->id].ringbuf; struct drm_device *dev = ring->dev; struct drm_i915_private *dev_priv = dev->dev_private; struct i915_workarounds *w = &dev_priv->workarounds; if (WARN_ON_ONCE(w->count == 0)) return 0; ring->gpu_caches_dirty = true; ret = logical_ring_flush_all_caches(ringbuf, ctx); if (ret) return ret; ret = intel_logical_ring_begin(ringbuf, ctx, w->count * 2 + 2); if (ret) return ret; intel_logical_ring_emit(ringbuf, MI_LOAD_REGISTER_IMM(w->count)); for (i = 0; i < w->count; i++) { intel_logical_ring_emit(ringbuf, w->reg[i].addr); intel_logical_ring_emit(ringbuf, w->reg[i].value); } intel_logical_ring_emit(ringbuf, MI_NOOP); intel_logical_ring_advance(ringbuf); ring->gpu_caches_dirty = true; ret = logical_ring_flush_all_caches(ringbuf, ctx); if (ret) return ret; return 0; } static int gen8_init_common_ring(struct intel_engine_cs *ring) { struct drm_device *dev = ring->dev; struct drm_i915_private *dev_priv = dev->dev_private; I915_WRITE_IMR(ring, ~(ring->irq_enable_mask | ring->irq_keep_mask)); I915_WRITE(RING_HWSTAM(ring->mmio_base), 0xffffffff); if (ring->status_page.obj) { I915_WRITE(RING_HWS_PGA(ring->mmio_base), (u32)ring->status_page.gfx_addr); POSTING_READ(RING_HWS_PGA(ring->mmio_base)); } I915_WRITE(RING_MODE_GEN7(ring), _MASKED_BIT_DISABLE(GFX_REPLAY_MODE) | _MASKED_BIT_ENABLE(GFX_RUN_LIST_ENABLE)); POSTING_READ(RING_MODE_GEN7(ring)); ring->next_context_status_buffer = 0; DRM_DEBUG_DRIVER("Execlists enabled for %s\n", ring->name); memset(&ring->hangcheck, 0, sizeof(ring->hangcheck)); return 0; } static int gen8_init_render_ring(struct intel_engine_cs *ring) { struct drm_device *dev = ring->dev; struct drm_i915_private *dev_priv = dev->dev_private; int ret; ret = gen8_init_common_ring(ring); if (ret) return ret; /* We need to disable the AsyncFlip performance optimisations in order * to use MI_WAIT_FOR_EVENT within the CS. It should already be * programmed to '1' on all products. * * WaDisableAsyncFlipPerfMode:snb,ivb,hsw,vlv,bdw,chv */ I915_WRITE(MI_MODE, _MASKED_BIT_ENABLE(ASYNC_FLIP_PERF_DISABLE)); I915_WRITE(INSTPM, _MASKED_BIT_ENABLE(INSTPM_FORCE_ORDERING)); return init_workarounds_ring(ring); } static int gen9_init_render_ring(struct intel_engine_cs *ring) { int ret; ret = gen8_init_common_ring(ring); if (ret) return ret; return init_workarounds_ring(ring); } static int gen8_emit_bb_start(struct intel_ringbuffer *ringbuf, struct intel_context *ctx, u64 offset, unsigned dispatch_flags) { bool ppgtt = !(dispatch_flags & I915_DISPATCH_SECURE); int ret; ret = intel_logical_ring_begin(ringbuf, ctx, 4); if (ret) return ret; /* FIXME(BDW): Address space and security selectors. */ intel_logical_ring_emit(ringbuf, MI_BATCH_BUFFER_START_GEN8 | (ppgtt<<8)); intel_logical_ring_emit(ringbuf, lower_32_bits(offset)); intel_logical_ring_emit(ringbuf, upper_32_bits(offset)); intel_logical_ring_emit(ringbuf, MI_NOOP); intel_logical_ring_advance(ringbuf); return 0; } static bool gen8_logical_ring_get_irq(struct intel_engine_cs *ring) { struct drm_device *dev = ring->dev; struct drm_i915_private *dev_priv = dev->dev_private; unsigned long flags; if (WARN_ON(!intel_irqs_enabled(dev_priv))) return false; spin_lock_irqsave(&dev_priv->irq_lock, flags); if (ring->irq_refcount++ == 0) { I915_WRITE_IMR(ring, ~(ring->irq_enable_mask | ring->irq_keep_mask)); POSTING_READ(RING_IMR(ring->mmio_base)); } spin_unlock_irqrestore(&dev_priv->irq_lock, flags); return true; } static void gen8_logical_ring_put_irq(struct intel_engine_cs *ring) { struct drm_device *dev = ring->dev; struct drm_i915_private *dev_priv = dev->dev_private; unsigned long flags; spin_lock_irqsave(&dev_priv->irq_lock, flags); if (--ring->irq_refcount == 0) { I915_WRITE_IMR(ring, ~ring->irq_keep_mask); POSTING_READ(RING_IMR(ring->mmio_base)); } spin_unlock_irqrestore(&dev_priv->irq_lock, flags); } static int gen8_emit_flush(struct intel_ringbuffer *ringbuf, struct intel_context *ctx, u32 invalidate_domains, u32 unused) { struct intel_engine_cs *ring = ringbuf->ring; struct drm_device *dev = ring->dev; struct drm_i915_private *dev_priv = dev->dev_private; uint32_t cmd; int ret; ret = intel_logical_ring_begin(ringbuf, ctx, 4); if (ret) return ret; cmd = MI_FLUSH_DW + 1; /* We always require a command barrier so that subsequent * commands, such as breadcrumb interrupts, are strictly ordered * wrt the contents of the write cache being flushed to memory * (and thus being coherent from the CPU). */ cmd |= MI_FLUSH_DW_STORE_INDEX | MI_FLUSH_DW_OP_STOREDW; if (invalidate_domains & I915_GEM_GPU_DOMAINS) { cmd |= MI_INVALIDATE_TLB; if (ring == &dev_priv->ring[VCS]) cmd |= MI_INVALIDATE_BSD; } intel_logical_ring_emit(ringbuf, cmd); intel_logical_ring_emit(ringbuf, I915_GEM_HWS_SCRATCH_ADDR | MI_FLUSH_DW_USE_GTT); intel_logical_ring_emit(ringbuf, 0); /* upper addr */ intel_logical_ring_emit(ringbuf, 0); /* value */ intel_logical_ring_advance(ringbuf); return 0; } static int gen8_emit_flush_render(struct intel_ringbuffer *ringbuf, struct intel_context *ctx, u32 invalidate_domains, u32 flush_domains) { struct intel_engine_cs *ring = ringbuf->ring; u32 scratch_addr = ring->scratch.gtt_offset + 2 * CACHELINE_BYTES; u32 flags = 0; int ret; flags |= PIPE_CONTROL_CS_STALL; if (flush_domains) { flags |= PIPE_CONTROL_RENDER_TARGET_CACHE_FLUSH; flags |= PIPE_CONTROL_DEPTH_CACHE_FLUSH; flags |= PIPE_CONTROL_FLUSH_ENABLE; } if (invalidate_domains) { flags |= PIPE_CONTROL_TLB_INVALIDATE; flags |= PIPE_CONTROL_INSTRUCTION_CACHE_INVALIDATE; flags |= PIPE_CONTROL_TEXTURE_CACHE_INVALIDATE; flags |= PIPE_CONTROL_VF_CACHE_INVALIDATE; flags |= PIPE_CONTROL_CONST_CACHE_INVALIDATE; flags |= PIPE_CONTROL_STATE_CACHE_INVALIDATE; flags |= PIPE_CONTROL_QW_WRITE; flags |= PIPE_CONTROL_GLOBAL_GTT_IVB; } ret = intel_logical_ring_begin(ringbuf, ctx, 6); if (ret) return ret; intel_logical_ring_emit(ringbuf, GFX_OP_PIPE_CONTROL(6)); intel_logical_ring_emit(ringbuf, flags); intel_logical_ring_emit(ringbuf, scratch_addr); intel_logical_ring_emit(ringbuf, 0); intel_logical_ring_emit(ringbuf, 0); intel_logical_ring_emit(ringbuf, 0); intel_logical_ring_advance(ringbuf); return 0; } static u32 gen8_get_seqno(struct intel_engine_cs *ring, bool lazy_coherency) { return intel_read_status_page(ring, I915_GEM_HWS_INDEX); } static void gen8_set_seqno(struct intel_engine_cs *ring, u32 seqno) { intel_write_status_page(ring, I915_GEM_HWS_INDEX, seqno); } static int gen8_emit_request(struct intel_ringbuffer *ringbuf, struct drm_i915_gem_request *request) { struct intel_engine_cs *ring = ringbuf->ring; u32 cmd; int ret; /* * Reserve space for 2 NOOPs at the end of each request to be * used as a workaround for not being allowed to do lite * restore with HEAD==TAIL (WaIdleLiteRestore). */ ret = intel_logical_ring_begin(ringbuf, request->ctx, 8); if (ret) return ret; cmd = MI_STORE_DWORD_IMM_GEN4; cmd |= MI_GLOBAL_GTT; intel_logical_ring_emit(ringbuf, cmd); intel_logical_ring_emit(ringbuf, (ring->status_page.gfx_addr + (I915_GEM_HWS_INDEX << MI_STORE_DWORD_INDEX_SHIFT))); intel_logical_ring_emit(ringbuf, 0); intel_logical_ring_emit(ringbuf, i915_gem_request_get_seqno(ring->outstanding_lazy_request)); intel_logical_ring_emit(ringbuf, MI_USER_INTERRUPT); intel_logical_ring_emit(ringbuf, MI_NOOP); intel_logical_ring_advance_and_submit(ringbuf, request->ctx, request); /* * Here we add two extra NOOPs as padding to avoid * lite restore of a context with HEAD==TAIL. */ intel_logical_ring_emit(ringbuf, MI_NOOP); intel_logical_ring_emit(ringbuf, MI_NOOP); intel_logical_ring_advance(ringbuf); return 0; } static int intel_lr_context_render_state_init(struct intel_engine_cs *ring, struct intel_context *ctx) { struct intel_ringbuffer *ringbuf = ctx->engine[ring->id].ringbuf; struct render_state so; struct drm_i915_file_private *file_priv = ctx->file_priv; struct drm_file *file = file_priv ? file_priv->file : NULL; int ret; ret = i915_gem_render_state_prepare(ring, &so); if (ret) return ret; if (so.rodata == NULL) return 0; ret = ring->emit_bb_start(ringbuf, ctx, so.ggtt_offset, I915_DISPATCH_SECURE); if (ret) goto out; i915_vma_move_to_active(i915_gem_obj_to_ggtt(so.obj), ring); ret = __i915_add_request(ring, file, so.obj); /* intel_logical_ring_add_request moves object to inactive if it * fails */ out: i915_gem_render_state_fini(&so); return ret; } static int gen8_init_rcs_context(struct intel_engine_cs *ring, struct intel_context *ctx) { int ret; ret = intel_logical_ring_workarounds_emit(ring, ctx); if (ret) return ret; return intel_lr_context_render_state_init(ring, ctx); } /** * intel_logical_ring_cleanup() - deallocate the Engine Command Streamer * * @ring: Engine Command Streamer. * */ void intel_logical_ring_cleanup(struct intel_engine_cs *ring) { struct drm_i915_private *dev_priv; if (!intel_ring_initialized(ring)) return; dev_priv = ring->dev->dev_private; intel_logical_ring_stop(ring); WARN_ON((I915_READ_MODE(ring) & MODE_IDLE) == 0); i915_gem_request_assign(&ring->outstanding_lazy_request, NULL); if (ring->cleanup) ring->cleanup(ring); i915_cmd_parser_fini_ring(ring); if (ring->status_page.obj) { kunmap(sg_page(ring->status_page.obj->pages->sgl)); ring->status_page.obj = NULL; } } static int logical_ring_init(struct drm_device *dev, struct intel_engine_cs *ring) { int ret; /* Intentionally left blank. */ ring->buffer = NULL; ring->dev = dev; INIT_LIST_HEAD(&ring->active_list); INIT_LIST_HEAD(&ring->request_list); init_waitqueue_head(&ring->irq_queue); INIT_LIST_HEAD(&ring->execlist_queue); INIT_LIST_HEAD(&ring->execlist_retired_req_list); spin_lock_init(&ring->execlist_lock); ret = i915_cmd_parser_init_ring(ring); if (ret) return ret; ret = intel_lr_context_deferred_create(ring->default_context, ring); return ret; } static int logical_render_ring_init(struct drm_device *dev) { struct drm_i915_private *dev_priv = dev->dev_private; struct intel_engine_cs *ring = &dev_priv->ring[RCS]; int ret; ring->name = "render ring"; ring->id = RCS; ring->mmio_base = RENDER_RING_BASE; ring->irq_enable_mask = GT_RENDER_USER_INTERRUPT << GEN8_RCS_IRQ_SHIFT; ring->irq_keep_mask = GT_CONTEXT_SWITCH_INTERRUPT << GEN8_RCS_IRQ_SHIFT; if (HAS_L3_DPF(dev)) ring->irq_keep_mask |= GT_RENDER_L3_PARITY_ERROR_INTERRUPT; if (INTEL_INFO(dev)->gen >= 9) ring->init_hw = gen9_init_render_ring; else ring->init_hw = gen8_init_render_ring; ring->init_context = gen8_init_rcs_context; ring->cleanup = intel_fini_pipe_control; ring->get_seqno = gen8_get_seqno; ring->set_seqno = gen8_set_seqno; ring->emit_request = gen8_emit_request; ring->emit_flush = gen8_emit_flush_render; ring->irq_get = gen8_logical_ring_get_irq; ring->irq_put = gen8_logical_ring_put_irq; ring->emit_bb_start = gen8_emit_bb_start; ring->dev = dev; ret = logical_ring_init(dev, ring); if (ret) return ret; return intel_init_pipe_control(ring); } static int logical_bsd_ring_init(struct drm_device *dev) { struct drm_i915_private *dev_priv = dev->dev_private; struct intel_engine_cs *ring = &dev_priv->ring[VCS]; ring->name = "bsd ring"; ring->id = VCS; ring->mmio_base = GEN6_BSD_RING_BASE; ring->irq_enable_mask = GT_RENDER_USER_INTERRUPT << GEN8_VCS1_IRQ_SHIFT; ring->irq_keep_mask = GT_CONTEXT_SWITCH_INTERRUPT << GEN8_VCS1_IRQ_SHIFT; ring->init_hw = gen8_init_common_ring; ring->get_seqno = gen8_get_seqno; ring->set_seqno = gen8_set_seqno; ring->emit_request = gen8_emit_request; ring->emit_flush = gen8_emit_flush; ring->irq_get = gen8_logical_ring_get_irq; ring->irq_put = gen8_logical_ring_put_irq; ring->emit_bb_start = gen8_emit_bb_start; return logical_ring_init(dev, ring); } static int logical_bsd2_ring_init(struct drm_device *dev) { struct drm_i915_private *dev_priv = dev->dev_private; struct intel_engine_cs *ring = &dev_priv->ring[VCS2]; ring->name = "bds2 ring"; ring->id = VCS2; ring->mmio_base = GEN8_BSD2_RING_BASE; ring->irq_enable_mask = GT_RENDER_USER_INTERRUPT << GEN8_VCS2_IRQ_SHIFT; ring->irq_keep_mask = GT_CONTEXT_SWITCH_INTERRUPT << GEN8_VCS2_IRQ_SHIFT; ring->init_hw = gen8_init_common_ring; ring->get_seqno = gen8_get_seqno; ring->set_seqno = gen8_set_seqno; ring->emit_request = gen8_emit_request; ring->emit_flush = gen8_emit_flush; ring->irq_get = gen8_logical_ring_get_irq; ring->irq_put = gen8_logical_ring_put_irq; ring->emit_bb_start = gen8_emit_bb_start; return logical_ring_init(dev, ring); } static int logical_blt_ring_init(struct drm_device *dev) { struct drm_i915_private *dev_priv = dev->dev_private; struct intel_engine_cs *ring = &dev_priv->ring[BCS]; ring->name = "blitter ring"; ring->id = BCS; ring->mmio_base = BLT_RING_BASE; ring->irq_enable_mask = GT_RENDER_USER_INTERRUPT << GEN8_BCS_IRQ_SHIFT; ring->irq_keep_mask = GT_CONTEXT_SWITCH_INTERRUPT << GEN8_BCS_IRQ_SHIFT; ring->init_hw = gen8_init_common_ring; ring->get_seqno = gen8_get_seqno; ring->set_seqno = gen8_set_seqno; ring->emit_request = gen8_emit_request; ring->emit_flush = gen8_emit_flush; ring->irq_get = gen8_logical_ring_get_irq; ring->irq_put = gen8_logical_ring_put_irq; ring->emit_bb_start = gen8_emit_bb_start; return logical_ring_init(dev, ring); } static int logical_vebox_ring_init(struct drm_device *dev) { struct drm_i915_private *dev_priv = dev->dev_private; struct intel_engine_cs *ring = &dev_priv->ring[VECS]; ring->name = "video enhancement ring"; ring->id = VECS; ring->mmio_base = VEBOX_RING_BASE; ring->irq_enable_mask = GT_RENDER_USER_INTERRUPT << GEN8_VECS_IRQ_SHIFT; ring->irq_keep_mask = GT_CONTEXT_SWITCH_INTERRUPT << GEN8_VECS_IRQ_SHIFT; ring->init_hw = gen8_init_common_ring; ring->get_seqno = gen8_get_seqno; ring->set_seqno = gen8_set_seqno; ring->emit_request = gen8_emit_request; ring->emit_flush = gen8_emit_flush; ring->irq_get = gen8_logical_ring_get_irq; ring->irq_put = gen8_logical_ring_put_irq; ring->emit_bb_start = gen8_emit_bb_start; return logical_ring_init(dev, ring); } /** * intel_logical_rings_init() - allocate, populate and init the Engine Command Streamers * @dev: DRM device. * * This function inits the engines for an Execlists submission style (the equivalent in the * legacy ringbuffer submission world would be i915_gem_init_rings). It does it only for * those engines that are present in the hardware. * * Return: non-zero if the initialization failed. */ int intel_logical_rings_init(struct drm_device *dev) { struct drm_i915_private *dev_priv = dev->dev_private; int ret; ret = logical_render_ring_init(dev); if (ret) return ret; if (HAS_BSD(dev)) { ret = logical_bsd_ring_init(dev); if (ret) goto cleanup_render_ring; } if (HAS_BLT(dev)) { ret = logical_blt_ring_init(dev); if (ret) goto cleanup_bsd_ring; } if (HAS_VEBOX(dev)) { ret = logical_vebox_ring_init(dev); if (ret) goto cleanup_blt_ring; } if (HAS_BSD2(dev)) { ret = logical_bsd2_ring_init(dev); if (ret) goto cleanup_vebox_ring; } ret = i915_gem_set_seqno(dev, ((u32)~0 - 0x1000)); if (ret) goto cleanup_bsd2_ring; return 0; cleanup_bsd2_ring: intel_logical_ring_cleanup(&dev_priv->ring[VCS2]); cleanup_vebox_ring: intel_logical_ring_cleanup(&dev_priv->ring[VECS]); cleanup_blt_ring: intel_logical_ring_cleanup(&dev_priv->ring[BCS]); cleanup_bsd_ring: intel_logical_ring_cleanup(&dev_priv->ring[VCS]); cleanup_render_ring: intel_logical_ring_cleanup(&dev_priv->ring[RCS]); return ret; } static u32 make_rpcs(struct drm_device *dev) { u32 rpcs = 0; /* * No explicit RPCS request is needed to ensure full * slice/subslice/EU enablement prior to Gen9. */ if (INTEL_INFO(dev)->gen < 9) return 0; /* * Starting in Gen9, render power gating can leave * slice/subslice/EU in a partially enabled state. We * must make an explicit request through RPCS for full * enablement. */ if (INTEL_INFO(dev)->has_slice_pg) { rpcs |= GEN8_RPCS_S_CNT_ENABLE; rpcs |= INTEL_INFO(dev)->slice_total << GEN8_RPCS_S_CNT_SHIFT; rpcs |= GEN8_RPCS_ENABLE; } if (INTEL_INFO(dev)->has_subslice_pg) { rpcs |= GEN8_RPCS_SS_CNT_ENABLE; rpcs |= INTEL_INFO(dev)->subslice_per_slice << GEN8_RPCS_SS_CNT_SHIFT; rpcs |= GEN8_RPCS_ENABLE; } if (INTEL_INFO(dev)->has_eu_pg) { rpcs |= INTEL_INFO(dev)->eu_per_subslice << GEN8_RPCS_EU_MIN_SHIFT; rpcs |= INTEL_INFO(dev)->eu_per_subslice << GEN8_RPCS_EU_MAX_SHIFT; rpcs |= GEN8_RPCS_ENABLE; } return rpcs; } static int populate_lr_context(struct intel_context *ctx, struct drm_i915_gem_object *ctx_obj, struct intel_engine_cs *ring, struct intel_ringbuffer *ringbuf) { struct drm_device *dev = ring->dev; struct drm_i915_private *dev_priv = dev->dev_private; struct i915_hw_ppgtt *ppgtt = ctx->ppgtt; struct page *page; uint32_t *reg_state; int ret; if (!ppgtt) ppgtt = dev_priv->mm.aliasing_ppgtt; ret = i915_gem_object_set_to_cpu_domain(ctx_obj, true); if (ret) { DRM_DEBUG_DRIVER("Could not set to CPU domain\n"); return ret; } ret = i915_gem_object_get_pages(ctx_obj); if (ret) { DRM_DEBUG_DRIVER("Could not get object pages\n"); return ret; } i915_gem_object_pin_pages(ctx_obj); /* The second page of the context object contains some fields which must * be set up prior to the first execution. */ page = i915_gem_object_get_page(ctx_obj, 1); reg_state = kmap_atomic(page); /* A context is actually a big batch buffer with several MI_LOAD_REGISTER_IMM * commands followed by (reg, value) pairs. The values we are setting here are * only for the first context restore: on a subsequent save, the GPU will * recreate this batchbuffer with new values (including all the missing * MI_LOAD_REGISTER_IMM commands that we are not initializing here). */ if (ring->id == RCS) reg_state[CTX_LRI_HEADER_0] = MI_LOAD_REGISTER_IMM(14); else reg_state[CTX_LRI_HEADER_0] = MI_LOAD_REGISTER_IMM(11); reg_state[CTX_LRI_HEADER_0] |= MI_LRI_FORCE_POSTED; reg_state[CTX_CONTEXT_CONTROL] = RING_CONTEXT_CONTROL(ring); reg_state[CTX_CONTEXT_CONTROL+1] = _MASKED_BIT_ENABLE(CTX_CTRL_INHIBIT_SYN_CTX_SWITCH | CTX_CTRL_ENGINE_CTX_RESTORE_INHIBIT); reg_state[CTX_RING_HEAD] = RING_HEAD(ring->mmio_base); reg_state[CTX_RING_HEAD+1] = 0; reg_state[CTX_RING_TAIL] = RING_TAIL(ring->mmio_base); reg_state[CTX_RING_TAIL+1] = 0; reg_state[CTX_RING_BUFFER_START] = RING_START(ring->mmio_base); /* Ring buffer start address is not known until the buffer is pinned. * It is written to the context image in execlists_update_context() */ reg_state[CTX_RING_BUFFER_CONTROL] = RING_CTL(ring->mmio_base); reg_state[CTX_RING_BUFFER_CONTROL+1] = ((ringbuf->size - PAGE_SIZE) & RING_NR_PAGES) | RING_VALID; reg_state[CTX_BB_HEAD_U] = ring->mmio_base + 0x168; reg_state[CTX_BB_HEAD_U+1] = 0; reg_state[CTX_BB_HEAD_L] = ring->mmio_base + 0x140; reg_state[CTX_BB_HEAD_L+1] = 0; reg_state[CTX_BB_STATE] = ring->mmio_base + 0x110; reg_state[CTX_BB_STATE+1] = (1<<5); reg_state[CTX_SECOND_BB_HEAD_U] = ring->mmio_base + 0x11c; reg_state[CTX_SECOND_BB_HEAD_U+1] = 0; reg_state[CTX_SECOND_BB_HEAD_L] = ring->mmio_base + 0x114; reg_state[CTX_SECOND_BB_HEAD_L+1] = 0; reg_state[CTX_SECOND_BB_STATE] = ring->mmio_base + 0x118; reg_state[CTX_SECOND_BB_STATE+1] = 0; if (ring->id == RCS) { /* TODO: according to BSpec, the register state context * for CHV does not have these. OTOH, these registers do * exist in CHV. I'm waiting for a clarification */ reg_state[CTX_BB_PER_CTX_PTR] = ring->mmio_base + 0x1c0; reg_state[CTX_BB_PER_CTX_PTR+1] = 0; reg_state[CTX_RCS_INDIRECT_CTX] = ring->mmio_base + 0x1c4; reg_state[CTX_RCS_INDIRECT_CTX+1] = 0; reg_state[CTX_RCS_INDIRECT_CTX_OFFSET] = ring->mmio_base + 0x1c8; reg_state[CTX_RCS_INDIRECT_CTX_OFFSET+1] = 0; } reg_state[CTX_LRI_HEADER_1] = MI_LOAD_REGISTER_IMM(9); reg_state[CTX_LRI_HEADER_1] |= MI_LRI_FORCE_POSTED; reg_state[CTX_CTX_TIMESTAMP] = ring->mmio_base + 0x3a8; reg_state[CTX_CTX_TIMESTAMP+1] = 0; reg_state[CTX_PDP3_UDW] = GEN8_RING_PDP_UDW(ring, 3); reg_state[CTX_PDP3_LDW] = GEN8_RING_PDP_LDW(ring, 3); reg_state[CTX_PDP2_UDW] = GEN8_RING_PDP_UDW(ring, 2); reg_state[CTX_PDP2_LDW] = GEN8_RING_PDP_LDW(ring, 2); reg_state[CTX_PDP1_UDW] = GEN8_RING_PDP_UDW(ring, 1); reg_state[CTX_PDP1_LDW] = GEN8_RING_PDP_LDW(ring, 1); reg_state[CTX_PDP0_UDW] = GEN8_RING_PDP_UDW(ring, 0); reg_state[CTX_PDP0_LDW] = GEN8_RING_PDP_LDW(ring, 0); reg_state[CTX_PDP3_UDW+1] = upper_32_bits(ppgtt->pdp.page_directory[3]->daddr); reg_state[CTX_PDP3_LDW+1] = lower_32_bits(ppgtt->pdp.page_directory[3]->daddr); reg_state[CTX_PDP2_UDW+1] = upper_32_bits(ppgtt->pdp.page_directory[2]->daddr); reg_state[CTX_PDP2_LDW+1] = lower_32_bits(ppgtt->pdp.page_directory[2]->daddr); reg_state[CTX_PDP1_UDW+1] = upper_32_bits(ppgtt->pdp.page_directory[1]->daddr); reg_state[CTX_PDP1_LDW+1] = lower_32_bits(ppgtt->pdp.page_directory[1]->daddr); reg_state[CTX_PDP0_UDW+1] = upper_32_bits(ppgtt->pdp.page_directory[0]->daddr); reg_state[CTX_PDP0_LDW+1] = lower_32_bits(ppgtt->pdp.page_directory[0]->daddr); if (ring->id == RCS) { reg_state[CTX_LRI_HEADER_2] = MI_LOAD_REGISTER_IMM(1); reg_state[CTX_R_PWR_CLK_STATE] = GEN8_R_PWR_CLK_STATE; reg_state[CTX_R_PWR_CLK_STATE+1] = make_rpcs(dev); } kunmap_atomic(reg_state); ctx_obj->dirty = 1; set_page_dirty(page); i915_gem_object_unpin_pages(ctx_obj); return 0; } /** * intel_lr_context_free() - free the LRC specific bits of a context * @ctx: the LR context to free. * * The real context freeing is done in i915_gem_context_free: this only * takes care of the bits that are LRC related: the per-engine backing * objects and the logical ringbuffer. */ void intel_lr_context_free(struct intel_context *ctx) { int i; for (i = 0; i < I915_NUM_RINGS; i++) { struct drm_i915_gem_object *ctx_obj = ctx->engine[i].state; if (ctx_obj) { struct intel_ringbuffer *ringbuf = ctx->engine[i].ringbuf; struct intel_engine_cs *ring = ringbuf->ring; if (ctx == ring->default_context) { intel_unpin_ringbuffer_obj(ringbuf); i915_gem_object_ggtt_unpin(ctx_obj); } WARN_ON(ctx->engine[ring->id].pin_count); intel_destroy_ringbuffer_obj(ringbuf); kfree(ringbuf); drm_gem_object_unreference(&ctx_obj->base); } } } static uint32_t get_lr_context_size(struct intel_engine_cs *ring) { int ret = 0; WARN_ON(INTEL_INFO(ring->dev)->gen < 8); switch (ring->id) { case RCS: if (INTEL_INFO(ring->dev)->gen >= 9) ret = GEN9_LR_CONTEXT_RENDER_SIZE; else ret = GEN8_LR_CONTEXT_RENDER_SIZE; break; case VCS: case BCS: case VECS: case VCS2: ret = GEN8_LR_CONTEXT_OTHER_SIZE; break; } return ret; } static void lrc_setup_hardware_status_page(struct intel_engine_cs *ring, struct drm_i915_gem_object *default_ctx_obj) { struct drm_i915_private *dev_priv = ring->dev->dev_private; /* The status page is offset 0 from the default context object * in LRC mode. */ ring->status_page.gfx_addr = i915_gem_obj_ggtt_offset(default_ctx_obj); ring->status_page.page_addr = kmap(sg_page(default_ctx_obj->pages->sgl)); ring->status_page.obj = default_ctx_obj; I915_WRITE(RING_HWS_PGA(ring->mmio_base), (u32)ring->status_page.gfx_addr); POSTING_READ(RING_HWS_PGA(ring->mmio_base)); } /** * intel_lr_context_deferred_create() - create the LRC specific bits of a context * @ctx: LR context to create. * @ring: engine to be used with the context. * * This function can be called more than once, with different engines, if we plan * to use the context with them. The context backing objects and the ringbuffers * (specially the ringbuffer backing objects) suck a lot of memory up, and that's why * the creation is a deferred call: it's better to make sure first that we need to use * a given ring with the context. * * Return: non-zero on error. */ int intel_lr_context_deferred_create(struct intel_context *ctx, struct intel_engine_cs *ring) { const bool is_global_default_ctx = (ctx == ring->default_context); struct drm_device *dev = ring->dev; struct drm_i915_gem_object *ctx_obj; uint32_t context_size; struct intel_ringbuffer *ringbuf; int ret; WARN_ON(ctx->legacy_hw_ctx.rcs_state != NULL); WARN_ON(ctx->engine[ring->id].state); context_size = round_up(get_lr_context_size(ring), 4096); ctx_obj = i915_gem_alloc_context_obj(dev, context_size); if (IS_ERR(ctx_obj)) { ret = PTR_ERR(ctx_obj); DRM_DEBUG_DRIVER("Alloc LRC backing obj failed: %d\n", ret); return ret; } if (is_global_default_ctx) { ret = i915_gem_obj_ggtt_pin(ctx_obj, GEN8_LR_CONTEXT_ALIGN, 0); if (ret) { DRM_DEBUG_DRIVER("Pin LRC backing obj failed: %d\n", ret); drm_gem_object_unreference(&ctx_obj->base); return ret; } } ringbuf = kzalloc(sizeof(*ringbuf), GFP_KERNEL); if (!ringbuf) { DRM_DEBUG_DRIVER("Failed to allocate ringbuffer %s\n", ring->name); ret = -ENOMEM; goto error_unpin_ctx; } ringbuf->ring = ring; ringbuf->size = 32 * PAGE_SIZE; ringbuf->effective_size = ringbuf->size; ringbuf->head = 0; ringbuf->tail = 0; ringbuf->last_retired_head = -1; intel_ring_update_space(ringbuf); if (ringbuf->obj == NULL) { ret = intel_alloc_ringbuffer_obj(dev, ringbuf); if (ret) { DRM_DEBUG_DRIVER( "Failed to allocate ringbuffer obj %s: %d\n", ring->name, ret); goto error_free_rbuf; } if (is_global_default_ctx) { ret = intel_pin_and_map_ringbuffer_obj(dev, ringbuf); if (ret) { DRM_ERROR( "Failed to pin and map ringbuffer %s: %d\n", ring->name, ret); goto error_destroy_rbuf; } } } ret = populate_lr_context(ctx, ctx_obj, ring, ringbuf); if (ret) { DRM_DEBUG_DRIVER("Failed to populate LRC: %d\n", ret); goto error; } ctx->engine[ring->id].ringbuf = ringbuf; ctx->engine[ring->id].state = ctx_obj; if (ctx == ring->default_context) lrc_setup_hardware_status_page(ring, ctx_obj); else if (ring->id == RCS && !ctx->rcs_initialized) { if (ring->init_context) { ret = ring->init_context(ring, ctx); if (ret) { DRM_ERROR("ring init context: %d\n", ret); ctx->engine[ring->id].ringbuf = NULL; ctx->engine[ring->id].state = NULL; goto error; } } ctx->rcs_initialized = true; } return 0; error: if (is_global_default_ctx) intel_unpin_ringbuffer_obj(ringbuf); error_destroy_rbuf: intel_destroy_ringbuffer_obj(ringbuf); error_free_rbuf: kfree(ringbuf); error_unpin_ctx: if (is_global_default_ctx) i915_gem_object_ggtt_unpin(ctx_obj); drm_gem_object_unreference(&ctx_obj->base); return ret; } void intel_lr_context_reset(struct drm_device *dev, struct intel_context *ctx) { struct drm_i915_private *dev_priv = dev->dev_private; struct intel_engine_cs *ring; int i; for_each_ring(ring, dev_priv, i) { struct drm_i915_gem_object *ctx_obj = ctx->engine[ring->id].state; struct intel_ringbuffer *ringbuf = ctx->engine[ring->id].ringbuf; uint32_t *reg_state; struct page *page; if (!ctx_obj) continue; if (i915_gem_object_get_pages(ctx_obj)) { WARN(1, "Failed get_pages for context obj\n"); continue; } page = i915_gem_object_get_page(ctx_obj, 1); reg_state = kmap_atomic(page); reg_state[CTX_RING_HEAD+1] = 0; reg_state[CTX_RING_TAIL+1] = 0; kunmap_atomic(reg_state); ringbuf->head = 0; ringbuf->tail = 0; } }