/* * Copyright © 2008-2010 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: * Eric Anholt * Zou Nan hai * Xiang Hai hao * */ #include #include #include "i915_drv.h" #include #include "i915_trace.h" #include "intel_drv.h" /* Rough estimate of the typical request size, performing a flush, * set-context and then emitting the batch. */ #define LEGACY_REQUEST_SIZE 200 static int __intel_ring_space(int head, int tail, int size) { int space = head - tail; if (space <= 0) space += size; return space - I915_RING_FREE_SPACE; } void intel_ring_update_space(struct intel_ring *ring) { if (ring->last_retired_head != -1) { ring->head = ring->last_retired_head; ring->last_retired_head = -1; } ring->space = __intel_ring_space(ring->head & HEAD_ADDR, ring->tail, ring->size); } static int gen2_render_ring_flush(struct drm_i915_gem_request *req, u32 mode) { u32 cmd, *cs; cmd = MI_FLUSH; if (mode & EMIT_INVALIDATE) cmd |= MI_READ_FLUSH; cs = intel_ring_begin(req, 2); if (IS_ERR(cs)) return PTR_ERR(cs); *cs++ = cmd; *cs++ = MI_NOOP; intel_ring_advance(req, cs); return 0; } static int gen4_render_ring_flush(struct drm_i915_gem_request *req, u32 mode) { u32 cmd, *cs; /* * read/write caches: * * I915_GEM_DOMAIN_RENDER is always invalidated, but is * only flushed if MI_NO_WRITE_FLUSH is unset. On 965, it is * also flushed at 2d versus 3d pipeline switches. * * read-only caches: * * I915_GEM_DOMAIN_SAMPLER is flushed on pre-965 if * MI_READ_FLUSH is set, and is always flushed on 965. * * I915_GEM_DOMAIN_COMMAND may not exist? * * I915_GEM_DOMAIN_INSTRUCTION, which exists on 965, is * invalidated when MI_EXE_FLUSH is set. * * I915_GEM_DOMAIN_VERTEX, which exists on 965, is * invalidated with every MI_FLUSH. * * TLBs: * * On 965, TLBs associated with I915_GEM_DOMAIN_COMMAND * and I915_GEM_DOMAIN_CPU in are invalidated at PTE write and * I915_GEM_DOMAIN_RENDER and I915_GEM_DOMAIN_SAMPLER * are flushed at any MI_FLUSH. */ cmd = MI_FLUSH; if (mode & EMIT_INVALIDATE) { cmd |= MI_EXE_FLUSH; if (IS_G4X(req->i915) || IS_GEN5(req->i915)) cmd |= MI_INVALIDATE_ISP; } cs = intel_ring_begin(req, 2); if (IS_ERR(cs)) return PTR_ERR(cs); *cs++ = cmd; *cs++ = MI_NOOP; intel_ring_advance(req, cs); return 0; } /** * Emits a PIPE_CONTROL with a non-zero post-sync operation, for * implementing two workarounds on gen6. From section 1.4.7.1 * "PIPE_CONTROL" of the Sandy Bridge PRM volume 2 part 1: * * [DevSNB-C+{W/A}] Before any depth stall flush (including those * produced by non-pipelined state commands), software needs to first * send a PIPE_CONTROL with no bits set except Post-Sync Operation != * 0. * * [Dev-SNB{W/A}]: Before a PIPE_CONTROL with Write Cache Flush Enable * =1, a PIPE_CONTROL with any non-zero post-sync-op is required. * * And the workaround for these two requires this workaround first: * * [Dev-SNB{W/A}]: Pipe-control with CS-stall bit set must be sent * BEFORE the pipe-control with a post-sync op and no write-cache * flushes. * * And this last workaround is tricky because of the requirements on * that bit. From section 1.4.7.2.3 "Stall" of the Sandy Bridge PRM * volume 2 part 1: * * "1 of the following must also be set: * - Render Target Cache Flush Enable ([12] of DW1) * - Depth Cache Flush Enable ([0] of DW1) * - Stall at Pixel Scoreboard ([1] of DW1) * - Depth Stall ([13] of DW1) * - Post-Sync Operation ([13] of DW1) * - Notify Enable ([8] of DW1)" * * The cache flushes require the workaround flush that triggered this * one, so we can't use it. Depth stall would trigger the same. * Post-sync nonzero is what triggered this second workaround, so we * can't use that one either. Notify enable is IRQs, which aren't * really our business. That leaves only stall at scoreboard. */ static int intel_emit_post_sync_nonzero_flush(struct drm_i915_gem_request *req) { u32 scratch_addr = i915_ggtt_offset(req->engine->scratch) + 2 * CACHELINE_BYTES; u32 *cs; cs = intel_ring_begin(req, 6); if (IS_ERR(cs)) return PTR_ERR(cs); *cs++ = GFX_OP_PIPE_CONTROL(5); *cs++ = PIPE_CONTROL_CS_STALL | PIPE_CONTROL_STALL_AT_SCOREBOARD; *cs++ = scratch_addr | PIPE_CONTROL_GLOBAL_GTT; *cs++ = 0; /* low dword */ *cs++ = 0; /* high dword */ *cs++ = MI_NOOP; intel_ring_advance(req, cs); cs = intel_ring_begin(req, 6); if (IS_ERR(cs)) return PTR_ERR(cs); *cs++ = GFX_OP_PIPE_CONTROL(5); *cs++ = PIPE_CONTROL_QW_WRITE; *cs++ = scratch_addr | PIPE_CONTROL_GLOBAL_GTT; *cs++ = 0; *cs++ = 0; *cs++ = MI_NOOP; intel_ring_advance(req, cs); return 0; } static int gen6_render_ring_flush(struct drm_i915_gem_request *req, u32 mode) { u32 scratch_addr = i915_ggtt_offset(req->engine->scratch) + 2 * CACHELINE_BYTES; u32 *cs, flags = 0; int ret; /* Force SNB workarounds for PIPE_CONTROL flushes */ ret = intel_emit_post_sync_nonzero_flush(req); if (ret) return ret; /* Just flush everything. Experiments have shown that reducing the * number of bits based on the write domains has little performance * impact. */ if (mode & EMIT_FLUSH) { flags |= PIPE_CONTROL_RENDER_TARGET_CACHE_FLUSH; flags |= PIPE_CONTROL_DEPTH_CACHE_FLUSH; /* * Ensure that any following seqno writes only happen * when the render cache is indeed flushed. */ flags |= PIPE_CONTROL_CS_STALL; } if (mode & EMIT_INVALIDATE) { 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; /* * TLB invalidate requires a post-sync write. */ flags |= PIPE_CONTROL_QW_WRITE | PIPE_CONTROL_CS_STALL; } cs = intel_ring_begin(req, 4); if (IS_ERR(cs)) return PTR_ERR(cs); *cs++ = GFX_OP_PIPE_CONTROL(4); *cs++ = flags; *cs++ = scratch_addr | PIPE_CONTROL_GLOBAL_GTT; *cs++ = 0; intel_ring_advance(req, cs); return 0; } static int gen7_render_ring_cs_stall_wa(struct drm_i915_gem_request *req) { u32 *cs; cs = intel_ring_begin(req, 4); if (IS_ERR(cs)) return PTR_ERR(cs); *cs++ = GFX_OP_PIPE_CONTROL(4); *cs++ = PIPE_CONTROL_CS_STALL | PIPE_CONTROL_STALL_AT_SCOREBOARD; *cs++ = 0; *cs++ = 0; intel_ring_advance(req, cs); return 0; } static int gen7_render_ring_flush(struct drm_i915_gem_request *req, u32 mode) { u32 scratch_addr = i915_ggtt_offset(req->engine->scratch) + 2 * CACHELINE_BYTES; u32 *cs, flags = 0; /* * Ensure that any following seqno writes only happen when the render * cache is indeed flushed. * * Workaround: 4th PIPE_CONTROL command (except the ones with only * read-cache invalidate bits set) must have the CS_STALL bit set. We * don't try to be clever and just set it unconditionally. */ flags |= PIPE_CONTROL_CS_STALL; /* Just flush everything. Experiments have shown that reducing the * number of bits based on the write domains has little performance * impact. */ if (mode & EMIT_FLUSH) { flags |= PIPE_CONTROL_RENDER_TARGET_CACHE_FLUSH; flags |= PIPE_CONTROL_DEPTH_CACHE_FLUSH; flags |= PIPE_CONTROL_DC_FLUSH_ENABLE; flags |= PIPE_CONTROL_FLUSH_ENABLE; } if (mode & EMIT_INVALIDATE) { 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_MEDIA_STATE_CLEAR; /* * TLB invalidate requires a post-sync write. */ flags |= PIPE_CONTROL_QW_WRITE; flags |= PIPE_CONTROL_GLOBAL_GTT_IVB; flags |= PIPE_CONTROL_STALL_AT_SCOREBOARD; /* Workaround: we must issue a pipe_control with CS-stall bit * set before a pipe_control command that has the state cache * invalidate bit set. */ gen7_render_ring_cs_stall_wa(req); } cs = intel_ring_begin(req, 4); if (IS_ERR(cs)) return PTR_ERR(cs); *cs++ = GFX_OP_PIPE_CONTROL(4); *cs++ = flags; *cs++ = scratch_addr; *cs++ = 0; intel_ring_advance(req, cs); return 0; } static int gen8_render_ring_flush(struct drm_i915_gem_request *req, u32 mode) { u32 flags; u32 *cs; cs = intel_ring_begin(req, mode & EMIT_INVALIDATE ? 12 : 6); if (IS_ERR(cs)) return PTR_ERR(cs); flags = PIPE_CONTROL_CS_STALL; if (mode & EMIT_FLUSH) { flags |= PIPE_CONTROL_RENDER_TARGET_CACHE_FLUSH; flags |= PIPE_CONTROL_DEPTH_CACHE_FLUSH; flags |= PIPE_CONTROL_DC_FLUSH_ENABLE; flags |= PIPE_CONTROL_FLUSH_ENABLE; } if (mode & EMIT_INVALIDATE) { 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; /* WaCsStallBeforeStateCacheInvalidate:bdw,chv */ cs = gen8_emit_pipe_control(cs, PIPE_CONTROL_CS_STALL | PIPE_CONTROL_STALL_AT_SCOREBOARD, 0); } cs = gen8_emit_pipe_control(cs, flags, i915_ggtt_offset(req->engine->scratch) + 2 * CACHELINE_BYTES); intel_ring_advance(req, cs); return 0; } static void ring_setup_phys_status_page(struct intel_engine_cs *engine) { struct drm_i915_private *dev_priv = engine->i915; u32 addr; addr = dev_priv->status_page_dmah->busaddr; if (INTEL_GEN(dev_priv) >= 4) addr |= (dev_priv->status_page_dmah->busaddr >> 28) & 0xf0; I915_WRITE(HWS_PGA, addr); } static void intel_ring_setup_status_page(struct intel_engine_cs *engine) { struct drm_i915_private *dev_priv = engine->i915; i915_reg_t mmio; /* The ring status page addresses are no longer next to the rest of * the ring registers as of gen7. */ if (IS_GEN7(dev_priv)) { switch (engine->id) { case RCS: mmio = RENDER_HWS_PGA_GEN7; break; case BCS: mmio = BLT_HWS_PGA_GEN7; break; /* * VCS2 actually doesn't exist on Gen7. Only shut up * gcc switch check warning */ case VCS2: case VCS: mmio = BSD_HWS_PGA_GEN7; break; case VECS: mmio = VEBOX_HWS_PGA_GEN7; break; } } else if (IS_GEN6(dev_priv)) { mmio = RING_HWS_PGA_GEN6(engine->mmio_base); } else { /* XXX: gen8 returns to sanity */ mmio = RING_HWS_PGA(engine->mmio_base); } I915_WRITE(mmio, engine->status_page.ggtt_offset); POSTING_READ(mmio); /* * Flush the TLB for this page * * FIXME: These two bits have disappeared on gen8, so a question * arises: do we still need this and if so how should we go about * invalidating the TLB? */ if (IS_GEN(dev_priv, 6, 7)) { i915_reg_t reg = RING_INSTPM(engine->mmio_base); /* ring should be idle before issuing a sync flush*/ WARN_ON((I915_READ_MODE(engine) & MODE_IDLE) == 0); I915_WRITE(reg, _MASKED_BIT_ENABLE(INSTPM_TLB_INVALIDATE | INSTPM_SYNC_FLUSH)); if (intel_wait_for_register(dev_priv, reg, INSTPM_SYNC_FLUSH, 0, 1000)) DRM_ERROR("%s: wait for SyncFlush to complete for TLB invalidation timed out\n", engine->name); } } static bool stop_ring(struct intel_engine_cs *engine) { struct drm_i915_private *dev_priv = engine->i915; if (INTEL_GEN(dev_priv) > 2) { I915_WRITE_MODE(engine, _MASKED_BIT_ENABLE(STOP_RING)); if (intel_wait_for_register(dev_priv, RING_MI_MODE(engine->mmio_base), MODE_IDLE, MODE_IDLE, 1000)) { DRM_ERROR("%s : timed out trying to stop ring\n", engine->name); /* Sometimes we observe that the idle flag is not * set even though the ring is empty. So double * check before giving up. */ if (I915_READ_HEAD(engine) != I915_READ_TAIL(engine)) return false; } } I915_WRITE_CTL(engine, 0); I915_WRITE_HEAD(engine, 0); I915_WRITE_TAIL(engine, 0); if (INTEL_GEN(dev_priv) > 2) { (void)I915_READ_CTL(engine); I915_WRITE_MODE(engine, _MASKED_BIT_DISABLE(STOP_RING)); } return (I915_READ_HEAD(engine) & HEAD_ADDR) == 0; } static int init_ring_common(struct intel_engine_cs *engine) { struct drm_i915_private *dev_priv = engine->i915; struct intel_ring *ring = engine->buffer; int ret = 0; intel_uncore_forcewake_get(dev_priv, FORCEWAKE_ALL); if (!stop_ring(engine)) { /* G45 ring initialization often fails to reset head to zero */ DRM_DEBUG_KMS("%s head not reset to zero " "ctl %08x head %08x tail %08x start %08x\n", engine->name, I915_READ_CTL(engine), I915_READ_HEAD(engine), I915_READ_TAIL(engine), I915_READ_START(engine)); if (!stop_ring(engine)) { DRM_ERROR("failed to set %s head to zero " "ctl %08x head %08x tail %08x start %08x\n", engine->name, I915_READ_CTL(engine), I915_READ_HEAD(engine), I915_READ_TAIL(engine), I915_READ_START(engine)); ret = -EIO; goto out; } } if (HWS_NEEDS_PHYSICAL(dev_priv)) ring_setup_phys_status_page(engine); else intel_ring_setup_status_page(engine); intel_engine_reset_breadcrumbs(engine); /* Enforce ordering by reading HEAD register back */ I915_READ_HEAD(engine); /* Initialize the ring. This must happen _after_ we've cleared the ring * registers with the above sequence (the readback of the HEAD registers * also enforces ordering), otherwise the hw might lose the new ring * register values. */ I915_WRITE_START(engine, i915_ggtt_offset(ring->vma)); /* WaClearRingBufHeadRegAtInit:ctg,elk */ if (I915_READ_HEAD(engine)) DRM_DEBUG("%s initialization failed [head=%08x], fudging\n", engine->name, I915_READ_HEAD(engine)); intel_ring_update_space(ring); I915_WRITE_HEAD(engine, ring->head); I915_WRITE_TAIL(engine, ring->tail); (void)I915_READ_TAIL(engine); I915_WRITE_CTL(engine, RING_CTL_SIZE(ring->size) | RING_VALID); /* If the head is still not zero, the ring is dead */ if (intel_wait_for_register_fw(dev_priv, RING_CTL(engine->mmio_base), RING_VALID, RING_VALID, 50)) { DRM_ERROR("%s initialization failed " "ctl %08x (valid? %d) head %08x [%08x] tail %08x [%08x] start %08x [expected %08x]\n", engine->name, I915_READ_CTL(engine), I915_READ_CTL(engine) & RING_VALID, I915_READ_HEAD(engine), ring->head, I915_READ_TAIL(engine), ring->tail, I915_READ_START(engine), i915_ggtt_offset(ring->vma)); ret = -EIO; goto out; } intel_engine_init_hangcheck(engine); out: intel_uncore_forcewake_put(dev_priv, FORCEWAKE_ALL); return ret; } static void reset_ring_common(struct intel_engine_cs *engine, struct drm_i915_gem_request *request) { /* Try to restore the logical GPU state to match the continuation * of the request queue. If we skip the context/PD restore, then * the next request may try to execute assuming that its context * is valid and loaded on the GPU and so may try to access invalid * memory, prompting repeated GPU hangs. * * If the request was guilty, we still restore the logical state * in case the next request requires it (e.g. the aliasing ppgtt), * but skip over the hung batch. * * If the request was innocent, we try to replay the request with * the restored context. */ if (request) { struct drm_i915_private *dev_priv = request->i915; struct intel_context *ce = &request->ctx->engine[engine->id]; struct i915_hw_ppgtt *ppgtt; /* FIXME consider gen8 reset */ if (ce->state) { I915_WRITE(CCID, i915_ggtt_offset(ce->state) | BIT(8) /* must be set! */ | CCID_EXTENDED_STATE_SAVE | CCID_EXTENDED_STATE_RESTORE | CCID_EN); } ppgtt = request->ctx->ppgtt ?: engine->i915->mm.aliasing_ppgtt; if (ppgtt) { u32 pd_offset = ppgtt->pd.base.ggtt_offset << 10; I915_WRITE(RING_PP_DIR_DCLV(engine), PP_DIR_DCLV_2G); I915_WRITE(RING_PP_DIR_BASE(engine), pd_offset); /* Wait for the PD reload to complete */ if (intel_wait_for_register(dev_priv, RING_PP_DIR_BASE(engine), BIT(0), 0, 10)) DRM_ERROR("Wait for reload of ppgtt page-directory timed out\n"); ppgtt->pd_dirty_rings &= ~intel_engine_flag(engine); } /* If the rq hung, jump to its breadcrumb and skip the batch */ if (request->fence.error == -EIO) { struct intel_ring *ring = request->ring; ring->head = request->postfix; ring->last_retired_head = -1; } } else { engine->legacy_active_context = NULL; } } static int intel_rcs_ctx_init(struct drm_i915_gem_request *req) { int ret; ret = intel_ring_workarounds_emit(req); if (ret != 0) return ret; ret = i915_gem_render_state_emit(req); if (ret) return ret; return 0; } static int init_render_ring(struct intel_engine_cs *engine) { struct drm_i915_private *dev_priv = engine->i915; int ret = init_ring_common(engine); if (ret) return ret; /* WaTimedSingleVertexDispatch:cl,bw,ctg,elk,ilk,snb */ if (IS_GEN(dev_priv, 4, 6)) I915_WRITE(MI_MODE, _MASKED_BIT_ENABLE(VS_TIMER_DISPATCH)); /* 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 */ if (IS_GEN(dev_priv, 6, 7)) I915_WRITE(MI_MODE, _MASKED_BIT_ENABLE(ASYNC_FLIP_PERF_DISABLE)); /* Required for the hardware to program scanline values for waiting */ /* WaEnableFlushTlbInvalidationMode:snb */ if (IS_GEN6(dev_priv)) I915_WRITE(GFX_MODE, _MASKED_BIT_ENABLE(GFX_TLB_INVALIDATE_EXPLICIT)); /* WaBCSVCSTlbInvalidationMode:ivb,vlv,hsw */ if (IS_GEN7(dev_priv)) I915_WRITE(GFX_MODE_GEN7, _MASKED_BIT_ENABLE(GFX_TLB_INVALIDATE_EXPLICIT) | _MASKED_BIT_ENABLE(GFX_REPLAY_MODE)); if (IS_GEN6(dev_priv)) { /* From the Sandybridge PRM, volume 1 part 3, page 24: * "If this bit is set, STCunit will have LRA as replacement * policy. [...] This bit must be reset. LRA replacement * policy is not supported." */ I915_WRITE(CACHE_MODE_0, _MASKED_BIT_DISABLE(CM0_STC_EVICT_DISABLE_LRA_SNB)); } if (IS_GEN(dev_priv, 6, 7)) I915_WRITE(INSTPM, _MASKED_BIT_ENABLE(INSTPM_FORCE_ORDERING)); if (INTEL_INFO(dev_priv)->gen >= 6) I915_WRITE_IMR(engine, ~engine->irq_keep_mask); return init_workarounds_ring(engine); } static void render_ring_cleanup(struct intel_engine_cs *engine) { struct drm_i915_private *dev_priv = engine->i915; i915_vma_unpin_and_release(&dev_priv->semaphore); } static u32 *gen8_rcs_signal(struct drm_i915_gem_request *req, u32 *cs) { struct drm_i915_private *dev_priv = req->i915; struct intel_engine_cs *waiter; enum intel_engine_id id; for_each_engine(waiter, dev_priv, id) { u64 gtt_offset = req->engine->semaphore.signal_ggtt[id]; if (gtt_offset == MI_SEMAPHORE_SYNC_INVALID) continue; *cs++ = GFX_OP_PIPE_CONTROL(6); *cs++ = PIPE_CONTROL_GLOBAL_GTT_IVB | PIPE_CONTROL_QW_WRITE | PIPE_CONTROL_CS_STALL; *cs++ = lower_32_bits(gtt_offset); *cs++ = upper_32_bits(gtt_offset); *cs++ = req->global_seqno; *cs++ = 0; *cs++ = MI_SEMAPHORE_SIGNAL | MI_SEMAPHORE_TARGET(waiter->hw_id); *cs++ = 0; } return cs; } static u32 *gen8_xcs_signal(struct drm_i915_gem_request *req, u32 *cs) { struct drm_i915_private *dev_priv = req->i915; struct intel_engine_cs *waiter; enum intel_engine_id id; for_each_engine(waiter, dev_priv, id) { u64 gtt_offset = req->engine->semaphore.signal_ggtt[id]; if (gtt_offset == MI_SEMAPHORE_SYNC_INVALID) continue; *cs++ = (MI_FLUSH_DW + 1) | MI_FLUSH_DW_OP_STOREDW; *cs++ = lower_32_bits(gtt_offset) | MI_FLUSH_DW_USE_GTT; *cs++ = upper_32_bits(gtt_offset); *cs++ = req->global_seqno; *cs++ = MI_SEMAPHORE_SIGNAL | MI_SEMAPHORE_TARGET(waiter->hw_id); *cs++ = 0; } return cs; } static u32 *gen6_signal(struct drm_i915_gem_request *req, u32 *cs) { struct drm_i915_private *dev_priv = req->i915; struct intel_engine_cs *engine; enum intel_engine_id id; int num_rings = 0; for_each_engine(engine, dev_priv, id) { i915_reg_t mbox_reg; if (!(BIT(engine->hw_id) & GEN6_SEMAPHORES_MASK)) continue; mbox_reg = req->engine->semaphore.mbox.signal[engine->hw_id]; if (i915_mmio_reg_valid(mbox_reg)) { *cs++ = MI_LOAD_REGISTER_IMM(1); *cs++ = i915_mmio_reg_offset(mbox_reg); *cs++ = req->global_seqno; num_rings++; } } if (num_rings & 1) *cs++ = MI_NOOP; return cs; } static void i9xx_submit_request(struct drm_i915_gem_request *request) { struct drm_i915_private *dev_priv = request->i915; i915_gem_request_submit(request); GEM_BUG_ON(!IS_ALIGNED(request->tail, 8)); I915_WRITE_TAIL(request->engine, request->tail); } static void i9xx_emit_breadcrumb(struct drm_i915_gem_request *req, u32 *cs) { *cs++ = MI_STORE_DWORD_INDEX; *cs++ = I915_GEM_HWS_INDEX << MI_STORE_DWORD_INDEX_SHIFT; *cs++ = req->global_seqno; *cs++ = MI_USER_INTERRUPT; req->tail = intel_ring_offset(req, cs); GEM_BUG_ON(!IS_ALIGNED(req->tail, 8)); } static const int i9xx_emit_breadcrumb_sz = 4; /** * gen6_sema_emit_breadcrumb - Update the semaphore mailbox registers * * @request - request to write to the ring * * Update the mailbox registers in the *other* rings with the current seqno. * This acts like a signal in the canonical semaphore. */ static void gen6_sema_emit_breadcrumb(struct drm_i915_gem_request *req, u32 *cs) { return i9xx_emit_breadcrumb(req, req->engine->semaphore.signal(req, cs)); } static void gen8_render_emit_breadcrumb(struct drm_i915_gem_request *req, u32 *cs) { struct intel_engine_cs *engine = req->engine; if (engine->semaphore.signal) cs = engine->semaphore.signal(req, cs); *cs++ = GFX_OP_PIPE_CONTROL(6); *cs++ = PIPE_CONTROL_GLOBAL_GTT_IVB | PIPE_CONTROL_CS_STALL | PIPE_CONTROL_QW_WRITE; *cs++ = intel_hws_seqno_address(engine); *cs++ = 0; *cs++ = req->global_seqno; /* We're thrashing one dword of HWS. */ *cs++ = 0; *cs++ = MI_USER_INTERRUPT; *cs++ = MI_NOOP; req->tail = intel_ring_offset(req, cs); GEM_BUG_ON(!IS_ALIGNED(req->tail, 8)); } static const int gen8_render_emit_breadcrumb_sz = 8; /** * intel_ring_sync - sync the waiter to the signaller on seqno * * @waiter - ring that is waiting * @signaller - ring which has, or will signal * @seqno - seqno which the waiter will block on */ static int gen8_ring_sync_to(struct drm_i915_gem_request *req, struct drm_i915_gem_request *signal) { struct drm_i915_private *dev_priv = req->i915; u64 offset = GEN8_WAIT_OFFSET(req->engine, signal->engine->id); struct i915_hw_ppgtt *ppgtt; u32 *cs; cs = intel_ring_begin(req, 4); if (IS_ERR(cs)) return PTR_ERR(cs); *cs++ = MI_SEMAPHORE_WAIT | MI_SEMAPHORE_GLOBAL_GTT | MI_SEMAPHORE_SAD_GTE_SDD; *cs++ = signal->global_seqno; *cs++ = lower_32_bits(offset); *cs++ = upper_32_bits(offset); intel_ring_advance(req, cs); /* When the !RCS engines idle waiting upon a semaphore, they lose their * pagetables and we must reload them before executing the batch. * We do this on the i915_switch_context() following the wait and * before the dispatch. */ ppgtt = req->ctx->ppgtt; if (ppgtt && req->engine->id != RCS) ppgtt->pd_dirty_rings |= intel_engine_flag(req->engine); return 0; } static int gen6_ring_sync_to(struct drm_i915_gem_request *req, struct drm_i915_gem_request *signal) { u32 dw1 = MI_SEMAPHORE_MBOX | MI_SEMAPHORE_COMPARE | MI_SEMAPHORE_REGISTER; u32 wait_mbox = signal->engine->semaphore.mbox.wait[req->engine->hw_id]; u32 *cs; WARN_ON(wait_mbox == MI_SEMAPHORE_SYNC_INVALID); cs = intel_ring_begin(req, 4); if (IS_ERR(cs)) return PTR_ERR(cs); *cs++ = dw1 | wait_mbox; /* Throughout all of the GEM code, seqno passed implies our current * seqno is >= the last seqno executed. However for hardware the * comparison is strictly greater than. */ *cs++ = signal->global_seqno - 1; *cs++ = 0; *cs++ = MI_NOOP; intel_ring_advance(req, cs); return 0; } static void gen5_seqno_barrier(struct intel_engine_cs *engine) { /* MI_STORE are internally buffered by the GPU and not flushed * either by MI_FLUSH or SyncFlush or any other combination of * MI commands. * * "Only the submission of the store operation is guaranteed. * The write result will be complete (coherent) some time later * (this is practically a finite period but there is no guaranteed * latency)." * * Empirically, we observe that we need a delay of at least 75us to * be sure that the seqno write is visible by the CPU. */ usleep_range(125, 250); } static void gen6_seqno_barrier(struct intel_engine_cs *engine) { struct drm_i915_private *dev_priv = engine->i915; /* Workaround to force correct ordering between irq and seqno writes on * ivb (and maybe also on snb) by reading from a CS register (like * ACTHD) before reading the status page. * * Note that this effectively stalls the read by the time it takes to * do a memory transaction, which more or less ensures that the write * from the GPU has sufficient time to invalidate the CPU cacheline. * Alternatively we could delay the interrupt from the CS ring to give * the write time to land, but that would incur a delay after every * batch i.e. much more frequent than a delay when waiting for the * interrupt (with the same net latency). * * Also note that to prevent whole machine hangs on gen7, we have to * take the spinlock to guard against concurrent cacheline access. */ spin_lock_irq(&dev_priv->uncore.lock); POSTING_READ_FW(RING_ACTHD(engine->mmio_base)); spin_unlock_irq(&dev_priv->uncore.lock); } static void gen5_irq_enable(struct intel_engine_cs *engine) { gen5_enable_gt_irq(engine->i915, engine->irq_enable_mask); } static void gen5_irq_disable(struct intel_engine_cs *engine) { gen5_disable_gt_irq(engine->i915, engine->irq_enable_mask); } static void i9xx_irq_enable(struct intel_engine_cs *engine) { struct drm_i915_private *dev_priv = engine->i915; dev_priv->irq_mask &= ~engine->irq_enable_mask; I915_WRITE(IMR, dev_priv->irq_mask); POSTING_READ_FW(RING_IMR(engine->mmio_base)); } static void i9xx_irq_disable(struct intel_engine_cs *engine) { struct drm_i915_private *dev_priv = engine->i915; dev_priv->irq_mask |= engine->irq_enable_mask; I915_WRITE(IMR, dev_priv->irq_mask); } static void i8xx_irq_enable(struct intel_engine_cs *engine) { struct drm_i915_private *dev_priv = engine->i915; dev_priv->irq_mask &= ~engine->irq_enable_mask; I915_WRITE16(IMR, dev_priv->irq_mask); POSTING_READ16(RING_IMR(engine->mmio_base)); } static void i8xx_irq_disable(struct intel_engine_cs *engine) { struct drm_i915_private *dev_priv = engine->i915; dev_priv->irq_mask |= engine->irq_enable_mask; I915_WRITE16(IMR, dev_priv->irq_mask); } static int bsd_ring_flush(struct drm_i915_gem_request *req, u32 mode) { u32 *cs; cs = intel_ring_begin(req, 2); if (IS_ERR(cs)) return PTR_ERR(cs); *cs++ = MI_FLUSH; *cs++ = MI_NOOP; intel_ring_advance(req, cs); return 0; } static void gen6_irq_enable(struct intel_engine_cs *engine) { struct drm_i915_private *dev_priv = engine->i915; I915_WRITE_IMR(engine, ~(engine->irq_enable_mask | engine->irq_keep_mask)); gen5_enable_gt_irq(dev_priv, engine->irq_enable_mask); } static void gen6_irq_disable(struct intel_engine_cs *engine) { struct drm_i915_private *dev_priv = engine->i915; I915_WRITE_IMR(engine, ~engine->irq_keep_mask); gen5_disable_gt_irq(dev_priv, engine->irq_enable_mask); } static void hsw_vebox_irq_enable(struct intel_engine_cs *engine) { struct drm_i915_private *dev_priv = engine->i915; I915_WRITE_IMR(engine, ~engine->irq_enable_mask); gen6_unmask_pm_irq(dev_priv, engine->irq_enable_mask); } static void hsw_vebox_irq_disable(struct intel_engine_cs *engine) { struct drm_i915_private *dev_priv = engine->i915; I915_WRITE_IMR(engine, ~0); gen6_mask_pm_irq(dev_priv, engine->irq_enable_mask); } static void gen8_irq_enable(struct intel_engine_cs *engine) { struct drm_i915_private *dev_priv = engine->i915; I915_WRITE_IMR(engine, ~(engine->irq_enable_mask | engine->irq_keep_mask)); POSTING_READ_FW(RING_IMR(engine->mmio_base)); } static void gen8_irq_disable(struct intel_engine_cs *engine) { struct drm_i915_private *dev_priv = engine->i915; I915_WRITE_IMR(engine, ~engine->irq_keep_mask); } static int i965_emit_bb_start(struct drm_i915_gem_request *req, u64 offset, u32 length, unsigned int dispatch_flags) { u32 *cs; cs = intel_ring_begin(req, 2); if (IS_ERR(cs)) return PTR_ERR(cs); *cs++ = MI_BATCH_BUFFER_START | MI_BATCH_GTT | (dispatch_flags & I915_DISPATCH_SECURE ? 0 : MI_BATCH_NON_SECURE_I965); *cs++ = offset; intel_ring_advance(req, cs); return 0; } /* Just userspace ABI convention to limit the wa batch bo to a resonable size */ #define I830_BATCH_LIMIT (256*1024) #define I830_TLB_ENTRIES (2) #define I830_WA_SIZE max(I830_TLB_ENTRIES*4096, I830_BATCH_LIMIT) static int i830_emit_bb_start(struct drm_i915_gem_request *req, u64 offset, u32 len, unsigned int dispatch_flags) { u32 *cs, cs_offset = i915_ggtt_offset(req->engine->scratch); cs = intel_ring_begin(req, 6); if (IS_ERR(cs)) return PTR_ERR(cs); /* Evict the invalid PTE TLBs */ *cs++ = COLOR_BLT_CMD | BLT_WRITE_RGBA; *cs++ = BLT_DEPTH_32 | BLT_ROP_COLOR_COPY | 4096; *cs++ = I830_TLB_ENTRIES << 16 | 4; /* load each page */ *cs++ = cs_offset; *cs++ = 0xdeadbeef; *cs++ = MI_NOOP; intel_ring_advance(req, cs); if ((dispatch_flags & I915_DISPATCH_PINNED) == 0) { if (len > I830_BATCH_LIMIT) return -ENOSPC; cs = intel_ring_begin(req, 6 + 2); if (IS_ERR(cs)) return PTR_ERR(cs); /* Blit the batch (which has now all relocs applied) to the * stable batch scratch bo area (so that the CS never * stumbles over its tlb invalidation bug) ... */ *cs++ = SRC_COPY_BLT_CMD | BLT_WRITE_RGBA; *cs++ = BLT_DEPTH_32 | BLT_ROP_SRC_COPY | 4096; *cs++ = DIV_ROUND_UP(len, 4096) << 16 | 4096; *cs++ = cs_offset; *cs++ = 4096; *cs++ = offset; *cs++ = MI_FLUSH; *cs++ = MI_NOOP; intel_ring_advance(req, cs); /* ... and execute it. */ offset = cs_offset; } cs = intel_ring_begin(req, 2); if (IS_ERR(cs)) return PTR_ERR(cs); *cs++ = MI_BATCH_BUFFER_START | MI_BATCH_GTT; *cs++ = offset | (dispatch_flags & I915_DISPATCH_SECURE ? 0 : MI_BATCH_NON_SECURE); intel_ring_advance(req, cs); return 0; } static int i915_emit_bb_start(struct drm_i915_gem_request *req, u64 offset, u32 len, unsigned int dispatch_flags) { u32 *cs; cs = intel_ring_begin(req, 2); if (IS_ERR(cs)) return PTR_ERR(cs); *cs++ = MI_BATCH_BUFFER_START | MI_BATCH_GTT; *cs++ = offset | (dispatch_flags & I915_DISPATCH_SECURE ? 0 : MI_BATCH_NON_SECURE); intel_ring_advance(req, cs); return 0; } static void cleanup_phys_status_page(struct intel_engine_cs *engine) { struct drm_i915_private *dev_priv = engine->i915; if (!dev_priv->status_page_dmah) return; drm_pci_free(&dev_priv->drm, dev_priv->status_page_dmah); engine->status_page.page_addr = NULL; } static void cleanup_status_page(struct intel_engine_cs *engine) { struct i915_vma *vma; struct drm_i915_gem_object *obj; vma = fetch_and_zero(&engine->status_page.vma); if (!vma) return; obj = vma->obj; i915_vma_unpin(vma); i915_vma_close(vma); i915_gem_object_unpin_map(obj); __i915_gem_object_release_unless_active(obj); } static int init_status_page(struct intel_engine_cs *engine) { struct drm_i915_gem_object *obj; struct i915_vma *vma; unsigned int flags; void *vaddr; int ret; obj = i915_gem_object_create_internal(engine->i915, PAGE_SIZE); if (IS_ERR(obj)) { DRM_ERROR("Failed to allocate status page\n"); return PTR_ERR(obj); } ret = i915_gem_object_set_cache_level(obj, I915_CACHE_LLC); if (ret) goto err; vma = i915_vma_instance(obj, &engine->i915->ggtt.base, NULL); if (IS_ERR(vma)) { ret = PTR_ERR(vma); goto err; } flags = PIN_GLOBAL; if (!HAS_LLC(engine->i915)) /* On g33, we cannot place HWS above 256MiB, so * restrict its pinning to the low mappable arena. * Though this restriction is not documented for * gen4, gen5, or byt, they also behave similarly * and hang if the HWS is placed at the top of the * GTT. To generalise, it appears that all !llc * platforms have issues with us placing the HWS * above the mappable region (even though we never * actualy map it). */ flags |= PIN_MAPPABLE; ret = i915_vma_pin(vma, 0, 4096, flags); if (ret) goto err; vaddr = i915_gem_object_pin_map(obj, I915_MAP_WB); if (IS_ERR(vaddr)) { ret = PTR_ERR(vaddr); goto err_unpin; } engine->status_page.vma = vma; engine->status_page.ggtt_offset = i915_ggtt_offset(vma); engine->status_page.page_addr = memset(vaddr, 0, PAGE_SIZE); DRM_DEBUG_DRIVER("%s hws offset: 0x%08x\n", engine->name, i915_ggtt_offset(vma)); return 0; err_unpin: i915_vma_unpin(vma); err: i915_gem_object_put(obj); return ret; } static int init_phys_status_page(struct intel_engine_cs *engine) { struct drm_i915_private *dev_priv = engine->i915; dev_priv->status_page_dmah = drm_pci_alloc(&dev_priv->drm, PAGE_SIZE, PAGE_SIZE); if (!dev_priv->status_page_dmah) return -ENOMEM; engine->status_page.page_addr = dev_priv->status_page_dmah->vaddr; memset(engine->status_page.page_addr, 0, PAGE_SIZE); return 0; } int intel_ring_pin(struct intel_ring *ring, unsigned int offset_bias) { unsigned int flags; enum i915_map_type map; struct i915_vma *vma = ring->vma; void *addr; int ret; GEM_BUG_ON(ring->vaddr); map = HAS_LLC(ring->engine->i915) ? I915_MAP_WB : I915_MAP_WC; flags = PIN_GLOBAL; if (offset_bias) flags |= PIN_OFFSET_BIAS | offset_bias; if (vma->obj->stolen) flags |= PIN_MAPPABLE; if (!(vma->flags & I915_VMA_GLOBAL_BIND)) { if (flags & PIN_MAPPABLE || map == I915_MAP_WC) ret = i915_gem_object_set_to_gtt_domain(vma->obj, true); else ret = i915_gem_object_set_to_cpu_domain(vma->obj, true); if (unlikely(ret)) return ret; } ret = i915_vma_pin(vma, 0, PAGE_SIZE, flags); if (unlikely(ret)) return ret; if (i915_vma_is_map_and_fenceable(vma)) addr = (void __force *)i915_vma_pin_iomap(vma); else addr = i915_gem_object_pin_map(vma->obj, map); if (IS_ERR(addr)) goto err; ring->vaddr = addr; return 0; err: i915_vma_unpin(vma); return PTR_ERR(addr); } void intel_ring_unpin(struct intel_ring *ring) { GEM_BUG_ON(!ring->vma); GEM_BUG_ON(!ring->vaddr); if (i915_vma_is_map_and_fenceable(ring->vma)) i915_vma_unpin_iomap(ring->vma); else i915_gem_object_unpin_map(ring->vma->obj); ring->vaddr = NULL; i915_vma_unpin(ring->vma); } static struct i915_vma * intel_ring_create_vma(struct drm_i915_private *dev_priv, int size) { struct drm_i915_gem_object *obj; struct i915_vma *vma; obj = i915_gem_object_create_stolen(dev_priv, size); if (!obj) obj = i915_gem_object_create(dev_priv, size); if (IS_ERR(obj)) return ERR_CAST(obj); /* mark ring buffers as read-only from GPU side by default */ obj->gt_ro = 1; vma = i915_vma_instance(obj, &dev_priv->ggtt.base, NULL); if (IS_ERR(vma)) goto err; return vma; err: i915_gem_object_put(obj); return vma; } struct intel_ring * intel_engine_create_ring(struct intel_engine_cs *engine, int size) { struct intel_ring *ring; struct i915_vma *vma; GEM_BUG_ON(!is_power_of_2(size)); GEM_BUG_ON(RING_CTL_SIZE(size) & ~RING_NR_PAGES); ring = kzalloc(sizeof(*ring), GFP_KERNEL); if (!ring) return ERR_PTR(-ENOMEM); ring->engine = engine; INIT_LIST_HEAD(&ring->request_list); ring->size = size; /* Workaround an erratum on the i830 which causes a hang if * the TAIL pointer points to within the last 2 cachelines * of the buffer. */ ring->effective_size = size; if (IS_I830(engine->i915) || IS_I845G(engine->i915)) ring->effective_size -= 2 * CACHELINE_BYTES; ring->last_retired_head = -1; intel_ring_update_space(ring); vma = intel_ring_create_vma(engine->i915, size); if (IS_ERR(vma)) { kfree(ring); return ERR_CAST(vma); } ring->vma = vma; return ring; } void intel_ring_free(struct intel_ring *ring) { struct drm_i915_gem_object *obj = ring->vma->obj; i915_vma_close(ring->vma); __i915_gem_object_release_unless_active(obj); kfree(ring); } static int context_pin(struct i915_gem_context *ctx) { struct i915_vma *vma = ctx->engine[RCS].state; int ret; /* Clear this page out of any CPU caches for coherent swap-in/out. * We only want to do this on the first bind so that we do not stall * on an active context (which by nature is already on the GPU). */ if (!(vma->flags & I915_VMA_GLOBAL_BIND)) { ret = i915_gem_object_set_to_gtt_domain(vma->obj, false); if (ret) return ret; } return i915_vma_pin(vma, 0, I915_GTT_MIN_ALIGNMENT, PIN_GLOBAL | PIN_HIGH); } static int intel_ring_context_pin(struct intel_engine_cs *engine, struct i915_gem_context *ctx) { struct intel_context *ce = &ctx->engine[engine->id]; int ret; lockdep_assert_held(&ctx->i915->drm.struct_mutex); if (ce->pin_count++) return 0; if (ce->state) { ret = context_pin(ctx); if (ret) goto error; } /* The kernel context is only used as a placeholder for flushing the * active context. It is never used for submitting user rendering and * as such never requires the golden render context, and so we can skip * emitting it when we switch to the kernel context. This is required * as during eviction we cannot allocate and pin the renderstate in * order to initialise the context. */ if (i915_gem_context_is_kernel(ctx)) ce->initialised = true; i915_gem_context_get(ctx); return 0; error: ce->pin_count = 0; return ret; } static void intel_ring_context_unpin(struct intel_engine_cs *engine, struct i915_gem_context *ctx) { struct intel_context *ce = &ctx->engine[engine->id]; lockdep_assert_held(&ctx->i915->drm.struct_mutex); GEM_BUG_ON(ce->pin_count == 0); if (--ce->pin_count) return; if (ce->state) i915_vma_unpin(ce->state); i915_gem_context_put(ctx); } static int intel_init_ring_buffer(struct intel_engine_cs *engine) { struct drm_i915_private *dev_priv = engine->i915; struct intel_ring *ring; int ret; WARN_ON(engine->buffer); intel_engine_setup_common(engine); ret = intel_engine_init_common(engine); if (ret) goto error; ring = intel_engine_create_ring(engine, 32 * PAGE_SIZE); if (IS_ERR(ring)) { ret = PTR_ERR(ring); goto error; } if (HWS_NEEDS_PHYSICAL(dev_priv)) { WARN_ON(engine->id != RCS); ret = init_phys_status_page(engine); if (ret) goto error; } else { ret = init_status_page(engine); if (ret) goto error; } /* Ring wraparound at offset 0 sometimes hangs. No idea why. */ ret = intel_ring_pin(ring, I915_GTT_PAGE_SIZE); if (ret) { intel_ring_free(ring); goto error; } engine->buffer = ring; return 0; error: intel_engine_cleanup(engine); return ret; } void intel_engine_cleanup(struct intel_engine_cs *engine) { struct drm_i915_private *dev_priv; dev_priv = engine->i915; if (engine->buffer) { WARN_ON(INTEL_GEN(dev_priv) > 2 && (I915_READ_MODE(engine) & MODE_IDLE) == 0); intel_ring_unpin(engine->buffer); intel_ring_free(engine->buffer); engine->buffer = NULL; } if (engine->cleanup) engine->cleanup(engine); if (HWS_NEEDS_PHYSICAL(dev_priv)) { WARN_ON(engine->id != RCS); cleanup_phys_status_page(engine); } else { cleanup_status_page(engine); } intel_engine_cleanup_common(engine); engine->i915 = NULL; dev_priv->engine[engine->id] = NULL; kfree(engine); } void intel_legacy_submission_resume(struct drm_i915_private *dev_priv) { struct intel_engine_cs *engine; enum intel_engine_id id; for_each_engine(engine, dev_priv, id) { engine->buffer->head = engine->buffer->tail; engine->buffer->last_retired_head = -1; } } static int ring_request_alloc(struct drm_i915_gem_request *request) { u32 *cs; GEM_BUG_ON(!request->ctx->engine[request->engine->id].pin_count); /* Flush enough space to reduce the likelihood of waiting after * we start building the request - in which case we will just * have to repeat work. */ request->reserved_space += LEGACY_REQUEST_SIZE; GEM_BUG_ON(!request->engine->buffer); request->ring = request->engine->buffer; cs = intel_ring_begin(request, 0); if (IS_ERR(cs)) return PTR_ERR(cs); request->reserved_space -= LEGACY_REQUEST_SIZE; return 0; } static int wait_for_space(struct drm_i915_gem_request *req, int bytes) { struct intel_ring *ring = req->ring; struct drm_i915_gem_request *target; long timeout; lockdep_assert_held(&req->i915->drm.struct_mutex); intel_ring_update_space(ring); if (ring->space >= bytes) return 0; /* * Space is reserved in the ringbuffer for finalising the request, * as that cannot be allowed to fail. During request finalisation, * reserved_space is set to 0 to stop the overallocation and the * assumption is that then we never need to wait (which has the * risk of failing with EINTR). * * See also i915_gem_request_alloc() and i915_add_request(). */ GEM_BUG_ON(!req->reserved_space); list_for_each_entry(target, &ring->request_list, ring_link) { unsigned space; /* Would completion of this request free enough space? */ space = __intel_ring_space(target->postfix, ring->tail, ring->size); if (space >= bytes) break; } if (WARN_ON(&target->ring_link == &ring->request_list)) return -ENOSPC; timeout = i915_wait_request(target, I915_WAIT_INTERRUPTIBLE | I915_WAIT_LOCKED, MAX_SCHEDULE_TIMEOUT); if (timeout < 0) return timeout; i915_gem_request_retire_upto(target); intel_ring_update_space(ring); GEM_BUG_ON(ring->space < bytes); return 0; } u32 *intel_ring_begin(struct drm_i915_gem_request *req, int num_dwords) { struct intel_ring *ring = req->ring; int remain_actual = ring->size - ring->tail; int remain_usable = ring->effective_size - ring->tail; int bytes = num_dwords * sizeof(u32); int total_bytes, wait_bytes; bool need_wrap = false; u32 *cs; total_bytes = bytes + req->reserved_space; if (unlikely(bytes > remain_usable)) { /* * Not enough space for the basic request. So need to flush * out the remainder and then wait for base + reserved. */ wait_bytes = remain_actual + total_bytes; need_wrap = true; } else if (unlikely(total_bytes > remain_usable)) { /* * The base request will fit but the reserved space * falls off the end. So we don't need an immediate wrap * and only need to effectively wait for the reserved * size space from the start of ringbuffer. */ wait_bytes = remain_actual + req->reserved_space; } else { /* No wrapping required, just waiting. */ wait_bytes = total_bytes; } if (wait_bytes > ring->space) { int ret = wait_for_space(req, wait_bytes); if (unlikely(ret)) return ERR_PTR(ret); } if (unlikely(need_wrap)) { GEM_BUG_ON(remain_actual > ring->space); GEM_BUG_ON(ring->tail + remain_actual > ring->size); /* Fill the tail with MI_NOOP */ memset(ring->vaddr + ring->tail, 0, remain_actual); ring->tail = 0; ring->space -= remain_actual; } GEM_BUG_ON(ring->tail > ring->size - bytes); cs = ring->vaddr + ring->tail; ring->tail += bytes; ring->space -= bytes; GEM_BUG_ON(ring->space < 0); return cs; } /* Align the ring tail to a cacheline boundary */ int intel_ring_cacheline_align(struct drm_i915_gem_request *req) { int num_dwords = (req->ring->tail & (CACHELINE_BYTES - 1)) / sizeof(uint32_t); u32 *cs; if (num_dwords == 0) return 0; num_dwords = CACHELINE_BYTES / sizeof(uint32_t) - num_dwords; cs = intel_ring_begin(req, num_dwords); if (IS_ERR(cs)) return PTR_ERR(cs); while (num_dwords--) *cs++ = MI_NOOP; intel_ring_advance(req, cs); return 0; } static void gen6_bsd_submit_request(struct drm_i915_gem_request *request) { struct drm_i915_private *dev_priv = request->i915; intel_uncore_forcewake_get(dev_priv, FORCEWAKE_ALL); /* Every tail move must follow the sequence below */ /* Disable notification that the ring is IDLE. The GT * will then assume that it is busy and bring it out of rc6. */ I915_WRITE_FW(GEN6_BSD_SLEEP_PSMI_CONTROL, _MASKED_BIT_ENABLE(GEN6_BSD_SLEEP_MSG_DISABLE)); /* Clear the context id. Here be magic! */ I915_WRITE64_FW(GEN6_BSD_RNCID, 0x0); /* Wait for the ring not to be idle, i.e. for it to wake up. */ if (intel_wait_for_register_fw(dev_priv, GEN6_BSD_SLEEP_PSMI_CONTROL, GEN6_BSD_SLEEP_INDICATOR, 0, 50)) DRM_ERROR("timed out waiting for the BSD ring to wake up\n"); /* Now that the ring is fully powered up, update the tail */ i9xx_submit_request(request); /* Let the ring send IDLE messages to the GT again, * and so let it sleep to conserve power when idle. */ I915_WRITE_FW(GEN6_BSD_SLEEP_PSMI_CONTROL, _MASKED_BIT_DISABLE(GEN6_BSD_SLEEP_MSG_DISABLE)); intel_uncore_forcewake_put(dev_priv, FORCEWAKE_ALL); } static int gen6_bsd_ring_flush(struct drm_i915_gem_request *req, u32 mode) { u32 cmd, *cs; cs = intel_ring_begin(req, 4); if (IS_ERR(cs)) return PTR_ERR(cs); cmd = MI_FLUSH_DW; if (INTEL_GEN(req->i915) >= 8) cmd += 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; /* * Bspec vol 1c.5 - video engine command streamer: * "If ENABLED, all TLBs will be invalidated once the flush * operation is complete. This bit is only valid when the * Post-Sync Operation field is a value of 1h or 3h." */ if (mode & EMIT_INVALIDATE) cmd |= MI_INVALIDATE_TLB | MI_INVALIDATE_BSD; *cs++ = cmd; *cs++ = I915_GEM_HWS_SCRATCH_ADDR | MI_FLUSH_DW_USE_GTT; if (INTEL_GEN(req->i915) >= 8) { *cs++ = 0; /* upper addr */ *cs++ = 0; /* value */ } else { *cs++ = 0; *cs++ = MI_NOOP; } intel_ring_advance(req, cs); return 0; } static int gen8_emit_bb_start(struct drm_i915_gem_request *req, u64 offset, u32 len, unsigned int dispatch_flags) { bool ppgtt = USES_PPGTT(req->i915) && !(dispatch_flags & I915_DISPATCH_SECURE); u32 *cs; cs = intel_ring_begin(req, 4); if (IS_ERR(cs)) return PTR_ERR(cs); /* FIXME(BDW): Address space and security selectors. */ *cs++ = MI_BATCH_BUFFER_START_GEN8 | (ppgtt << 8) | (dispatch_flags & I915_DISPATCH_RS ? MI_BATCH_RESOURCE_STREAMER : 0); *cs++ = lower_32_bits(offset); *cs++ = upper_32_bits(offset); *cs++ = MI_NOOP; intel_ring_advance(req, cs); return 0; } static int hsw_emit_bb_start(struct drm_i915_gem_request *req, u64 offset, u32 len, unsigned int dispatch_flags) { u32 *cs; cs = intel_ring_begin(req, 2); if (IS_ERR(cs)) return PTR_ERR(cs); *cs++ = MI_BATCH_BUFFER_START | (dispatch_flags & I915_DISPATCH_SECURE ? 0 : MI_BATCH_PPGTT_HSW | MI_BATCH_NON_SECURE_HSW) | (dispatch_flags & I915_DISPATCH_RS ? MI_BATCH_RESOURCE_STREAMER : 0); /* bit0-7 is the length on GEN6+ */ *cs++ = offset; intel_ring_advance(req, cs); return 0; } static int gen6_emit_bb_start(struct drm_i915_gem_request *req, u64 offset, u32 len, unsigned int dispatch_flags) { u32 *cs; cs = intel_ring_begin(req, 2); if (IS_ERR(cs)) return PTR_ERR(cs); *cs++ = MI_BATCH_BUFFER_START | (dispatch_flags & I915_DISPATCH_SECURE ? 0 : MI_BATCH_NON_SECURE_I965); /* bit0-7 is the length on GEN6+ */ *cs++ = offset; intel_ring_advance(req, cs); return 0; } /* Blitter support (SandyBridge+) */ static int gen6_ring_flush(struct drm_i915_gem_request *req, u32 mode) { u32 cmd, *cs; cs = intel_ring_begin(req, 4); if (IS_ERR(cs)) return PTR_ERR(cs); cmd = MI_FLUSH_DW; if (INTEL_GEN(req->i915) >= 8) cmd += 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; /* * Bspec vol 1c.3 - blitter engine command streamer: * "If ENABLED, all TLBs will be invalidated once the flush * operation is complete. This bit is only valid when the * Post-Sync Operation field is a value of 1h or 3h." */ if (mode & EMIT_INVALIDATE) cmd |= MI_INVALIDATE_TLB; *cs++ = cmd; *cs++ = I915_GEM_HWS_SCRATCH_ADDR | MI_FLUSH_DW_USE_GTT; if (INTEL_GEN(req->i915) >= 8) { *cs++ = 0; /* upper addr */ *cs++ = 0; /* value */ } else { *cs++ = 0; *cs++ = MI_NOOP; } intel_ring_advance(req, cs); return 0; } static void intel_ring_init_semaphores(struct drm_i915_private *dev_priv, struct intel_engine_cs *engine) { struct drm_i915_gem_object *obj; int ret, i; if (!i915.semaphores) return; if (INTEL_GEN(dev_priv) >= 8 && !dev_priv->semaphore) { struct i915_vma *vma; obj = i915_gem_object_create(dev_priv, PAGE_SIZE); if (IS_ERR(obj)) goto err; vma = i915_vma_instance(obj, &dev_priv->ggtt.base, NULL); if (IS_ERR(vma)) goto err_obj; ret = i915_gem_object_set_to_gtt_domain(obj, false); if (ret) goto err_obj; ret = i915_vma_pin(vma, 0, 0, PIN_GLOBAL | PIN_HIGH); if (ret) goto err_obj; dev_priv->semaphore = vma; } if (INTEL_GEN(dev_priv) >= 8) { u32 offset = i915_ggtt_offset(dev_priv->semaphore); engine->semaphore.sync_to = gen8_ring_sync_to; engine->semaphore.signal = gen8_xcs_signal; for (i = 0; i < I915_NUM_ENGINES; i++) { u32 ring_offset; if (i != engine->id) ring_offset = offset + GEN8_SEMAPHORE_OFFSET(engine->id, i); else ring_offset = MI_SEMAPHORE_SYNC_INVALID; engine->semaphore.signal_ggtt[i] = ring_offset; } } else if (INTEL_GEN(dev_priv) >= 6) { engine->semaphore.sync_to = gen6_ring_sync_to; engine->semaphore.signal = gen6_signal; /* * The current semaphore is only applied on pre-gen8 * platform. And there is no VCS2 ring on the pre-gen8 * platform. So the semaphore between RCS and VCS2 is * initialized as INVALID. Gen8 will initialize the * sema between VCS2 and RCS later. */ for (i = 0; i < GEN6_NUM_SEMAPHORES; i++) { static const struct { u32 wait_mbox; i915_reg_t mbox_reg; } sem_data[GEN6_NUM_SEMAPHORES][GEN6_NUM_SEMAPHORES] = { [RCS_HW] = { [VCS_HW] = { .wait_mbox = MI_SEMAPHORE_SYNC_RV, .mbox_reg = GEN6_VRSYNC }, [BCS_HW] = { .wait_mbox = MI_SEMAPHORE_SYNC_RB, .mbox_reg = GEN6_BRSYNC }, [VECS_HW] = { .wait_mbox = MI_SEMAPHORE_SYNC_RVE, .mbox_reg = GEN6_VERSYNC }, }, [VCS_HW] = { [RCS_HW] = { .wait_mbox = MI_SEMAPHORE_SYNC_VR, .mbox_reg = GEN6_RVSYNC }, [BCS_HW] = { .wait_mbox = MI_SEMAPHORE_SYNC_VB, .mbox_reg = GEN6_BVSYNC }, [VECS_HW] = { .wait_mbox = MI_SEMAPHORE_SYNC_VVE, .mbox_reg = GEN6_VEVSYNC }, }, [BCS_HW] = { [RCS_HW] = { .wait_mbox = MI_SEMAPHORE_SYNC_BR, .mbox_reg = GEN6_RBSYNC }, [VCS_HW] = { .wait_mbox = MI_SEMAPHORE_SYNC_BV, .mbox_reg = GEN6_VBSYNC }, [VECS_HW] = { .wait_mbox = MI_SEMAPHORE_SYNC_BVE, .mbox_reg = GEN6_VEBSYNC }, }, [VECS_HW] = { [RCS_HW] = { .wait_mbox = MI_SEMAPHORE_SYNC_VER, .mbox_reg = GEN6_RVESYNC }, [VCS_HW] = { .wait_mbox = MI_SEMAPHORE_SYNC_VEV, .mbox_reg = GEN6_VVESYNC }, [BCS_HW] = { .wait_mbox = MI_SEMAPHORE_SYNC_VEB, .mbox_reg = GEN6_BVESYNC }, }, }; u32 wait_mbox; i915_reg_t mbox_reg; if (i == engine->hw_id) { wait_mbox = MI_SEMAPHORE_SYNC_INVALID; mbox_reg = GEN6_NOSYNC; } else { wait_mbox = sem_data[engine->hw_id][i].wait_mbox; mbox_reg = sem_data[engine->hw_id][i].mbox_reg; } engine->semaphore.mbox.wait[i] = wait_mbox; engine->semaphore.mbox.signal[i] = mbox_reg; } } return; err_obj: i915_gem_object_put(obj); err: DRM_DEBUG_DRIVER("Failed to allocate space for semaphores, disabling\n"); i915.semaphores = 0; } static void intel_ring_init_irq(struct drm_i915_private *dev_priv, struct intel_engine_cs *engine) { engine->irq_enable_mask = GT_RENDER_USER_INTERRUPT << engine->irq_shift; if (INTEL_GEN(dev_priv) >= 8) { engine->irq_enable = gen8_irq_enable; engine->irq_disable = gen8_irq_disable; engine->irq_seqno_barrier = gen6_seqno_barrier; } else if (INTEL_GEN(dev_priv) >= 6) { engine->irq_enable = gen6_irq_enable; engine->irq_disable = gen6_irq_disable; engine->irq_seqno_barrier = gen6_seqno_barrier; } else if (INTEL_GEN(dev_priv) >= 5) { engine->irq_enable = gen5_irq_enable; engine->irq_disable = gen5_irq_disable; engine->irq_seqno_barrier = gen5_seqno_barrier; } else if (INTEL_GEN(dev_priv) >= 3) { engine->irq_enable = i9xx_irq_enable; engine->irq_disable = i9xx_irq_disable; } else { engine->irq_enable = i8xx_irq_enable; engine->irq_disable = i8xx_irq_disable; } } static void intel_ring_default_vfuncs(struct drm_i915_private *dev_priv, struct intel_engine_cs *engine) { intel_ring_init_irq(dev_priv, engine); intel_ring_init_semaphores(dev_priv, engine); engine->init_hw = init_ring_common; engine->reset_hw = reset_ring_common; engine->context_pin = intel_ring_context_pin; engine->context_unpin = intel_ring_context_unpin; engine->request_alloc = ring_request_alloc; engine->emit_breadcrumb = i9xx_emit_breadcrumb; engine->emit_breadcrumb_sz = i9xx_emit_breadcrumb_sz; if (i915.semaphores) { int num_rings; engine->emit_breadcrumb = gen6_sema_emit_breadcrumb; num_rings = hweight32(INTEL_INFO(dev_priv)->ring_mask) - 1; if (INTEL_GEN(dev_priv) >= 8) { engine->emit_breadcrumb_sz += num_rings * 6; } else { engine->emit_breadcrumb_sz += num_rings * 3; if (num_rings & 1) engine->emit_breadcrumb_sz++; } } engine->submit_request = i9xx_submit_request; if (INTEL_GEN(dev_priv) >= 8) engine->emit_bb_start = gen8_emit_bb_start; else if (INTEL_GEN(dev_priv) >= 6) engine->emit_bb_start = gen6_emit_bb_start; else if (INTEL_GEN(dev_priv) >= 4) engine->emit_bb_start = i965_emit_bb_start; else if (IS_I830(dev_priv) || IS_I845G(dev_priv)) engine->emit_bb_start = i830_emit_bb_start; else engine->emit_bb_start = i915_emit_bb_start; } int intel_init_render_ring_buffer(struct intel_engine_cs *engine) { struct drm_i915_private *dev_priv = engine->i915; int ret; intel_ring_default_vfuncs(dev_priv, engine); if (HAS_L3_DPF(dev_priv)) engine->irq_keep_mask = GT_RENDER_L3_PARITY_ERROR_INTERRUPT; if (INTEL_GEN(dev_priv) >= 8) { engine->init_context = intel_rcs_ctx_init; engine->emit_breadcrumb = gen8_render_emit_breadcrumb; engine->emit_breadcrumb_sz = gen8_render_emit_breadcrumb_sz; engine->emit_flush = gen8_render_ring_flush; if (i915.semaphores) { int num_rings; engine->semaphore.signal = gen8_rcs_signal; num_rings = hweight32(INTEL_INFO(dev_priv)->ring_mask) - 1; engine->emit_breadcrumb_sz += num_rings * 6; } } else if (INTEL_GEN(dev_priv) >= 6) { engine->init_context = intel_rcs_ctx_init; engine->emit_flush = gen7_render_ring_flush; if (IS_GEN6(dev_priv)) engine->emit_flush = gen6_render_ring_flush; } else if (IS_GEN5(dev_priv)) { engine->emit_flush = gen4_render_ring_flush; } else { if (INTEL_GEN(dev_priv) < 4) engine->emit_flush = gen2_render_ring_flush; else engine->emit_flush = gen4_render_ring_flush; engine->irq_enable_mask = I915_USER_INTERRUPT; } if (IS_HASWELL(dev_priv)) engine->emit_bb_start = hsw_emit_bb_start; engine->init_hw = init_render_ring; engine->cleanup = render_ring_cleanup; ret = intel_init_ring_buffer(engine); if (ret) return ret; if (INTEL_GEN(dev_priv) >= 6) { ret = intel_engine_create_scratch(engine, PAGE_SIZE); if (ret) return ret; } else if (HAS_BROKEN_CS_TLB(dev_priv)) { ret = intel_engine_create_scratch(engine, I830_WA_SIZE); if (ret) return ret; } return 0; } int intel_init_bsd_ring_buffer(struct intel_engine_cs *engine) { struct drm_i915_private *dev_priv = engine->i915; intel_ring_default_vfuncs(dev_priv, engine); if (INTEL_GEN(dev_priv) >= 6) { /* gen6 bsd needs a special wa for tail updates */ if (IS_GEN6(dev_priv)) engine->submit_request = gen6_bsd_submit_request; engine->emit_flush = gen6_bsd_ring_flush; if (INTEL_GEN(dev_priv) < 8) engine->irq_enable_mask = GT_BSD_USER_INTERRUPT; } else { engine->mmio_base = BSD_RING_BASE; engine->emit_flush = bsd_ring_flush; if (IS_GEN5(dev_priv)) engine->irq_enable_mask = ILK_BSD_USER_INTERRUPT; else engine->irq_enable_mask = I915_BSD_USER_INTERRUPT; } return intel_init_ring_buffer(engine); } /** * Initialize the second BSD ring (eg. Broadwell GT3, Skylake GT3) */ int intel_init_bsd2_ring_buffer(struct intel_engine_cs *engine) { struct drm_i915_private *dev_priv = engine->i915; intel_ring_default_vfuncs(dev_priv, engine); engine->emit_flush = gen6_bsd_ring_flush; return intel_init_ring_buffer(engine); } int intel_init_blt_ring_buffer(struct intel_engine_cs *engine) { struct drm_i915_private *dev_priv = engine->i915; intel_ring_default_vfuncs(dev_priv, engine); engine->emit_flush = gen6_ring_flush; if (INTEL_GEN(dev_priv) < 8) engine->irq_enable_mask = GT_BLT_USER_INTERRUPT; return intel_init_ring_buffer(engine); } int intel_init_vebox_ring_buffer(struct intel_engine_cs *engine) { struct drm_i915_private *dev_priv = engine->i915; intel_ring_default_vfuncs(dev_priv, engine); engine->emit_flush = gen6_ring_flush; if (INTEL_GEN(dev_priv) < 8) { engine->irq_enable_mask = PM_VEBOX_USER_INTERRUPT; engine->irq_enable = hsw_vebox_irq_enable; engine->irq_disable = hsw_vebox_irq_disable; } return intel_init_ring_buffer(engine); }