/* * 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 #include "i915_drv.h" #include "i915_gem_render_state.h" #include "i915_trace.h" #include "intel_drv.h" #include "intel_workarounds.h" /* Rough estimate of the typical request size, performing a flush, * set-context and then emitting the batch. */ #define LEGACY_REQUEST_SIZE 200 static unsigned int __intel_ring_space(unsigned int head, unsigned int tail, unsigned int size) { /* * "If the Ring Buffer Head Pointer and the Tail Pointer are on the * same cacheline, the Head Pointer must not be greater than the Tail * Pointer." */ GEM_BUG_ON(!is_power_of_2(size)); return (head - tail - CACHELINE_BYTES) & (size - 1); } unsigned int intel_ring_update_space(struct intel_ring *ring) { unsigned int space; space = __intel_ring_space(ring->head, ring->emit, ring->size); ring->space = space; return space; } static int gen2_render_ring_flush(struct i915_request *rq, u32 mode) { u32 cmd, *cs; cmd = MI_FLUSH; if (mode & EMIT_INVALIDATE) cmd |= MI_READ_FLUSH; cs = intel_ring_begin(rq, 2); if (IS_ERR(cs)) return PTR_ERR(cs); *cs++ = cmd; *cs++ = MI_NOOP; intel_ring_advance(rq, cs); return 0; } static int gen4_render_ring_flush(struct i915_request *rq, 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(rq->i915) || IS_GEN5(rq->i915)) cmd |= MI_INVALIDATE_ISP; } cs = intel_ring_begin(rq, 2); if (IS_ERR(cs)) return PTR_ERR(cs); *cs++ = cmd; *cs++ = MI_NOOP; intel_ring_advance(rq, 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 i915_request *rq) { u32 scratch_addr = i915_ggtt_offset(rq->engine->scratch) + 2 * CACHELINE_BYTES; u32 *cs; cs = intel_ring_begin(rq, 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(rq, cs); cs = intel_ring_begin(rq, 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(rq, cs); return 0; } static int gen6_render_ring_flush(struct i915_request *rq, u32 mode) { u32 scratch_addr = i915_ggtt_offset(rq->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(rq); 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(rq, 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(rq, cs); return 0; } static int gen7_render_ring_cs_stall_wa(struct i915_request *rq) { u32 *cs; cs = intel_ring_begin(rq, 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(rq, cs); return 0; } static int gen7_render_ring_flush(struct i915_request *rq, u32 mode) { u32 scratch_addr = i915_ggtt_offset(rq->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(rq); } cs = intel_ring_begin(rq, 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(rq, 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) { /* * No more rings exist on Gen7. Default case is only to shut up * gcc switch check warning. */ default: GEM_BUG_ON(engine->id); case RCS: mmio = RENDER_HWS_PGA_GEN7; break; case BCS: mmio = BLT_HWS_PGA_GEN7; break; 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 { mmio = RING_HWS_PGA(engine->mmio_base); } if (INTEL_GEN(dev_priv) >= 6) I915_WRITE(RING_HWSTAM(engine->mmio_base), 0xffffffff); I915_WRITE(mmio, engine->status_page.ggtt_offset); POSTING_READ(mmio); /* Flush the TLB for this page */ 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_HEAD(engine, I915_READ_TAIL(engine)); I915_WRITE_HEAD(engine, 0); I915_WRITE_TAIL(engine, 0); /* The ring must be empty before it is disabled */ I915_WRITE_CTL(engine, 0); 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_DRIVER("%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_DRIVER("%s initialization failed [head=%08x], fudging\n", engine->name, I915_READ_HEAD(engine)); /* Check that the ring offsets point within the ring! */ GEM_BUG_ON(!intel_ring_offset_valid(ring, ring->head)); GEM_BUG_ON(!intel_ring_offset_valid(ring, ring->tail)); 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(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; } if (INTEL_GEN(dev_priv) > 2) I915_WRITE_MODE(engine, _MASKED_BIT_DISABLE(STOP_RING)); out: intel_uncore_forcewake_put(dev_priv, FORCEWAKE_ALL); return ret; } static struct i915_request *reset_prepare(struct intel_engine_cs *engine) { intel_engine_stop_cs(engine); if (engine->irq_seqno_barrier) engine->irq_seqno_barrier(engine); return i915_gem_find_active_request(engine); } static void skip_request(struct i915_request *rq) { void *vaddr = rq->ring->vaddr; u32 head; head = rq->infix; if (rq->postfix < head) { memset32(vaddr + head, MI_NOOP, (rq->ring->size - head) / sizeof(u32)); head = 0; } memset32(vaddr + head, MI_NOOP, (rq->postfix - head) / sizeof(u32)); } static void reset_ring(struct intel_engine_cs *engine, struct i915_request *rq) { GEM_TRACE("%s seqno=%x\n", engine->name, rq ? rq->global_seqno : 0); /* * 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 (rq) { /* If the rq hung, jump to its breadcrumb and skip the batch */ rq->ring->head = intel_ring_wrap(rq->ring, rq->head); if (rq->fence.error == -EIO) skip_request(rq); } } static void reset_finish(struct intel_engine_cs *engine) { } static int intel_rcs_ctx_init(struct i915_request *rq) { int ret; ret = intel_ctx_workarounds_emit(rq); if (ret != 0) return ret; ret = i915_gem_render_state_emit(rq); 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; intel_whitelist_workarounds_apply(engine); /* 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_GEN(dev_priv) >= 6) I915_WRITE_IMR(engine, ~engine->irq_keep_mask); return 0; } static u32 *gen6_signal(struct i915_request *rq, u32 *cs) { struct drm_i915_private *dev_priv = rq->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 = rq->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++ = rq->global_seqno; num_rings++; } } if (num_rings & 1) *cs++ = MI_NOOP; return cs; } static void cancel_requests(struct intel_engine_cs *engine) { struct i915_request *request; unsigned long flags; spin_lock_irqsave(&engine->timeline.lock, flags); /* Mark all submitted requests as skipped. */ list_for_each_entry(request, &engine->timeline.requests, link) { GEM_BUG_ON(!request->global_seqno); if (!i915_request_completed(request)) dma_fence_set_error(&request->fence, -EIO); } /* Remaining _unready_ requests will be nop'ed when submitted */ spin_unlock_irqrestore(&engine->timeline.lock, flags); } static void i9xx_submit_request(struct i915_request *request) { struct drm_i915_private *dev_priv = request->i915; i915_request_submit(request); I915_WRITE_TAIL(request->engine, intel_ring_set_tail(request->ring, request->tail)); } static void i9xx_emit_breadcrumb(struct i915_request *rq, u32 *cs) { *cs++ = MI_STORE_DWORD_INDEX; *cs++ = I915_GEM_HWS_INDEX << MI_STORE_DWORD_INDEX_SHIFT; *cs++ = rq->global_seqno; *cs++ = MI_USER_INTERRUPT; rq->tail = intel_ring_offset(rq, cs); assert_ring_tail_valid(rq->ring, rq->tail); } static const int i9xx_emit_breadcrumb_sz = 4; static void gen6_sema_emit_breadcrumb(struct i915_request *rq, u32 *cs) { return i9xx_emit_breadcrumb(rq, rq->engine->semaphore.signal(rq, cs)); } static int gen6_ring_sync_to(struct i915_request *rq, struct i915_request *signal) { u32 dw1 = MI_SEMAPHORE_MBOX | MI_SEMAPHORE_COMPARE | MI_SEMAPHORE_REGISTER; u32 wait_mbox = signal->engine->semaphore.mbox.wait[rq->engine->hw_id]; u32 *cs; WARN_ON(wait_mbox == MI_SEMAPHORE_SYNC_INVALID); cs = intel_ring_begin(rq, 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(rq, 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 i915_request *rq, u32 mode) { u32 *cs; cs = intel_ring_begin(rq, 2); if (IS_ERR(cs)) return PTR_ERR(cs); *cs++ = MI_FLUSH; *cs++ = MI_NOOP; intel_ring_advance(rq, 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 int i965_emit_bb_start(struct i915_request *rq, u64 offset, u32 length, unsigned int dispatch_flags) { u32 *cs; cs = intel_ring_begin(rq, 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(rq, 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 i915_request *rq, u64 offset, u32 len, unsigned int dispatch_flags) { u32 *cs, cs_offset = i915_ggtt_offset(rq->engine->scratch); cs = intel_ring_begin(rq, 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(rq, cs); if ((dispatch_flags & I915_DISPATCH_PINNED) == 0) { if (len > I830_BATCH_LIMIT) return -ENOSPC; cs = intel_ring_begin(rq, 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(rq, cs); /* ... and execute it. */ offset = cs_offset; } cs = intel_ring_begin(rq, 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(rq, cs); return 0; } static int i915_emit_bb_start(struct i915_request *rq, u64 offset, u32 len, unsigned int dispatch_flags) { u32 *cs; cs = intel_ring_begin(rq, 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(rq, cs); return 0; } int intel_ring_pin(struct intel_ring *ring, struct drm_i915_private *i915, unsigned int offset_bias) { enum i915_map_type map = HAS_LLC(i915) ? I915_MAP_WB : I915_MAP_WC; struct i915_vma *vma = ring->vma; unsigned int flags; void *addr; int ret; GEM_BUG_ON(ring->vaddr); 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; vma->obj->pin_global++; ring->vaddr = addr; return 0; err: i915_vma_unpin(vma); return PTR_ERR(addr); } void intel_ring_reset(struct intel_ring *ring, u32 tail) { GEM_BUG_ON(!intel_ring_offset_valid(ring, tail)); ring->tail = tail; ring->head = tail; ring->emit = tail; intel_ring_update_space(ring); } void intel_ring_unpin(struct intel_ring *ring) { GEM_BUG_ON(!ring->vma); GEM_BUG_ON(!ring->vaddr); /* Discard any unused bytes beyond that submitted to hw. */ intel_ring_reset(ring, ring->tail); 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; ring->vma->obj->pin_global--; i915_vma_unpin(ring->vma); } static struct i915_vma * intel_ring_create_vma(struct drm_i915_private *dev_priv, int size) { struct i915_address_space *vm = &dev_priv->ggtt.vm; 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_internal(dev_priv, size); if (IS_ERR(obj)) return ERR_CAST(obj); /* * Mark ring buffers as read-only from GPU side (so no stray overwrites) * if supported by the platform's GGTT. */ if (vm->has_read_only) i915_gem_object_set_readonly(obj); vma = i915_vma_instance(obj, vm, 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, struct i915_timeline *timeline, 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); GEM_BUG_ON(timeline == &engine->timeline); lockdep_assert_held(&engine->i915->drm.struct_mutex); ring = kzalloc(sizeof(*ring), GFP_KERNEL); if (!ring) return ERR_PTR(-ENOMEM); INIT_LIST_HEAD(&ring->request_list); ring->timeline = i915_timeline_get(timeline); 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; 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); i915_timeline_put(ring->timeline); kfree(ring); } static void intel_ring_context_destroy(struct intel_context *ce) { GEM_BUG_ON(ce->pin_count); if (!ce->state) return; GEM_BUG_ON(i915_gem_object_is_active(ce->state->obj)); i915_gem_object_put(ce->state->obj); } static int __context_pin_ppgtt(struct i915_gem_context *ctx) { struct i915_hw_ppgtt *ppgtt; int err = 0; ppgtt = ctx->ppgtt ?: ctx->i915->mm.aliasing_ppgtt; if (ppgtt) err = gen6_ppgtt_pin(ppgtt); return err; } static void __context_unpin_ppgtt(struct i915_gem_context *ctx) { struct i915_hw_ppgtt *ppgtt; ppgtt = ctx->ppgtt ?: ctx->i915->mm.aliasing_ppgtt; if (ppgtt) gen6_ppgtt_unpin(ppgtt); } static int __context_pin(struct intel_context *ce) { struct i915_vma *vma; int err; vma = ce->state; if (!vma) return 0; /* * 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)) { err = i915_gem_object_set_to_gtt_domain(vma->obj, true); if (err) return err; } err = i915_vma_pin(vma, 0, I915_GTT_MIN_ALIGNMENT, PIN_GLOBAL | PIN_HIGH); if (err) return err; /* * And mark is as a globally pinned object to let the shrinker know * it cannot reclaim the object until we release it. */ vma->obj->pin_global++; return 0; } static void __context_unpin(struct intel_context *ce) { struct i915_vma *vma; vma = ce->state; if (!vma) return; vma->obj->pin_global--; i915_vma_unpin(vma); } static void intel_ring_context_unpin(struct intel_context *ce) { __context_unpin_ppgtt(ce->gem_context); __context_unpin(ce); i915_gem_context_put(ce->gem_context); } static struct i915_vma * alloc_context_vma(struct intel_engine_cs *engine) { struct drm_i915_private *i915 = engine->i915; struct drm_i915_gem_object *obj; struct i915_vma *vma; int err; obj = i915_gem_object_create(i915, engine->context_size); if (IS_ERR(obj)) return ERR_CAST(obj); if (engine->default_state) { void *defaults, *vaddr; vaddr = i915_gem_object_pin_map(obj, I915_MAP_WB); if (IS_ERR(vaddr)) { err = PTR_ERR(vaddr); goto err_obj; } defaults = i915_gem_object_pin_map(engine->default_state, I915_MAP_WB); if (IS_ERR(defaults)) { err = PTR_ERR(defaults); goto err_map; } memcpy(vaddr, defaults, engine->context_size); i915_gem_object_unpin_map(engine->default_state); i915_gem_object_unpin_map(obj); } /* * Try to make the context utilize L3 as well as LLC. * * On VLV we don't have L3 controls in the PTEs so we * shouldn't touch the cache level, especially as that * would make the object snooped which might have a * negative performance impact. * * Snooping is required on non-llc platforms in execlist * mode, but since all GGTT accesses use PAT entry 0 we * get snooping anyway regardless of cache_level. * * This is only applicable for Ivy Bridge devices since * later platforms don't have L3 control bits in the PTE. */ if (IS_IVYBRIDGE(i915)) { /* Ignore any error, regard it as a simple optimisation */ i915_gem_object_set_cache_level(obj, I915_CACHE_L3_LLC); } vma = i915_vma_instance(obj, &i915->ggtt.vm, NULL); if (IS_ERR(vma)) { err = PTR_ERR(vma); goto err_obj; } return vma; err_map: i915_gem_object_unpin_map(obj); err_obj: i915_gem_object_put(obj); return ERR_PTR(err); } static struct intel_context * __ring_context_pin(struct intel_engine_cs *engine, struct i915_gem_context *ctx, struct intel_context *ce) { int err; if (!ce->state && engine->context_size) { struct i915_vma *vma; vma = alloc_context_vma(engine); if (IS_ERR(vma)) { err = PTR_ERR(vma); goto err; } ce->state = vma; } err = __context_pin(ce); if (err) goto err; err = __context_pin_ppgtt(ce->gem_context); if (err) goto err_unpin; i915_gem_context_get(ctx); /* One ringbuffer to rule them all */ GEM_BUG_ON(!engine->buffer); ce->ring = engine->buffer; return ce; err_unpin: __context_unpin(ce); err: ce->pin_count = 0; return ERR_PTR(err); } static const struct intel_context_ops ring_context_ops = { .unpin = intel_ring_context_unpin, .destroy = intel_ring_context_destroy, }; static struct intel_context * intel_ring_context_pin(struct intel_engine_cs *engine, struct i915_gem_context *ctx) { struct intel_context *ce = to_intel_context(ctx, engine); lockdep_assert_held(&ctx->i915->drm.struct_mutex); if (likely(ce->pin_count++)) return ce; GEM_BUG_ON(!ce->pin_count); /* no overflow please! */ ce->ops = &ring_context_ops; return __ring_context_pin(engine, ctx, ce); } static int intel_init_ring_buffer(struct intel_engine_cs *engine) { struct i915_timeline *timeline; struct intel_ring *ring; unsigned int size; int err; intel_engine_setup_common(engine); timeline = i915_timeline_create(engine->i915, engine->name); if (IS_ERR(timeline)) { err = PTR_ERR(timeline); goto err; } ring = intel_engine_create_ring(engine, timeline, 32 * PAGE_SIZE); i915_timeline_put(timeline); if (IS_ERR(ring)) { err = PTR_ERR(ring); goto err; } /* Ring wraparound at offset 0 sometimes hangs. No idea why. */ err = intel_ring_pin(ring, engine->i915, I915_GTT_PAGE_SIZE); if (err) goto err_ring; GEM_BUG_ON(engine->buffer); engine->buffer = ring; size = PAGE_SIZE; if (HAS_BROKEN_CS_TLB(engine->i915)) size = I830_WA_SIZE; err = intel_engine_create_scratch(engine, size); if (err) goto err_unpin; err = intel_engine_init_common(engine); if (err) goto err_scratch; return 0; err_scratch: intel_engine_cleanup_scratch(engine); err_unpin: intel_ring_unpin(ring); err_ring: intel_ring_free(ring); err: intel_engine_cleanup_common(engine); return err; } void intel_engine_cleanup(struct intel_engine_cs *engine) { struct drm_i915_private *dev_priv = engine->i915; WARN_ON(INTEL_GEN(dev_priv) > 2 && (I915_READ_MODE(engine) & MODE_IDLE) == 0); intel_ring_unpin(engine->buffer); intel_ring_free(engine->buffer); if (engine->cleanup) engine->cleanup(engine); intel_engine_cleanup_common(engine); 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; /* Restart from the beginning of the rings for convenience */ for_each_engine(engine, dev_priv, id) intel_ring_reset(engine->buffer, 0); } static int load_pd_dir(struct i915_request *rq, const struct i915_hw_ppgtt *ppgtt) { const struct intel_engine_cs * const engine = rq->engine; u32 *cs; cs = intel_ring_begin(rq, 6); if (IS_ERR(cs)) return PTR_ERR(cs); *cs++ = MI_LOAD_REGISTER_IMM(1); *cs++ = i915_mmio_reg_offset(RING_PP_DIR_DCLV(engine)); *cs++ = PP_DIR_DCLV_2G; *cs++ = MI_LOAD_REGISTER_IMM(1); *cs++ = i915_mmio_reg_offset(RING_PP_DIR_BASE(engine)); *cs++ = ppgtt->pd.base.ggtt_offset << 10; intel_ring_advance(rq, cs); return 0; } static int flush_pd_dir(struct i915_request *rq) { const struct intel_engine_cs * const engine = rq->engine; u32 *cs; cs = intel_ring_begin(rq, 4); if (IS_ERR(cs)) return PTR_ERR(cs); /* Stall until the page table load is complete */ *cs++ = MI_STORE_REGISTER_MEM | MI_SRM_LRM_GLOBAL_GTT; *cs++ = i915_mmio_reg_offset(RING_PP_DIR_BASE(engine)); *cs++ = i915_ggtt_offset(engine->scratch); *cs++ = MI_NOOP; intel_ring_advance(rq, cs); return 0; } static inline int mi_set_context(struct i915_request *rq, u32 flags) { struct drm_i915_private *i915 = rq->i915; struct intel_engine_cs *engine = rq->engine; enum intel_engine_id id; const int num_rings = /* Use an extended w/a on gen7 if signalling from other rings */ (HAS_LEGACY_SEMAPHORES(i915) && IS_GEN7(i915)) ? INTEL_INFO(i915)->num_rings - 1 : 0; bool force_restore = false; int len; u32 *cs; flags |= MI_MM_SPACE_GTT; if (IS_HASWELL(i915)) /* These flags are for resource streamer on HSW+ */ flags |= HSW_MI_RS_SAVE_STATE_EN | HSW_MI_RS_RESTORE_STATE_EN; else flags |= MI_SAVE_EXT_STATE_EN | MI_RESTORE_EXT_STATE_EN; len = 4; if (IS_GEN7(i915)) len += 2 + (num_rings ? 4*num_rings + 6 : 0); if (flags & MI_FORCE_RESTORE) { GEM_BUG_ON(flags & MI_RESTORE_INHIBIT); flags &= ~MI_FORCE_RESTORE; force_restore = true; len += 2; } cs = intel_ring_begin(rq, len); if (IS_ERR(cs)) return PTR_ERR(cs); /* WaProgramMiArbOnOffAroundMiSetContext:ivb,vlv,hsw,bdw,chv */ if (IS_GEN7(i915)) { *cs++ = MI_ARB_ON_OFF | MI_ARB_DISABLE; if (num_rings) { struct intel_engine_cs *signaller; *cs++ = MI_LOAD_REGISTER_IMM(num_rings); for_each_engine(signaller, i915, id) { if (signaller == engine) continue; *cs++ = i915_mmio_reg_offset( RING_PSMI_CTL(signaller->mmio_base)); *cs++ = _MASKED_BIT_ENABLE( GEN6_PSMI_SLEEP_MSG_DISABLE); } } } if (force_restore) { /* * The HW doesn't handle being told to restore the current * context very well. Quite often it likes goes to go off and * sulk, especially when it is meant to be reloading PP_DIR. * A very simple fix to force the reload is to simply switch * away from the current context and back again. * * Note that the kernel_context will contain random state * following the INHIBIT_RESTORE. We accept this since we * never use the kernel_context state; it is merely a * placeholder we use to flush other contexts. */ *cs++ = MI_SET_CONTEXT; *cs++ = i915_ggtt_offset(to_intel_context(i915->kernel_context, engine)->state) | MI_MM_SPACE_GTT | MI_RESTORE_INHIBIT; } *cs++ = MI_NOOP; *cs++ = MI_SET_CONTEXT; *cs++ = i915_ggtt_offset(rq->hw_context->state) | flags; /* * w/a: MI_SET_CONTEXT must always be followed by MI_NOOP * WaMiSetContext_Hang:snb,ivb,vlv */ *cs++ = MI_NOOP; if (IS_GEN7(i915)) { if (num_rings) { struct intel_engine_cs *signaller; i915_reg_t last_reg = {}; /* keep gcc quiet */ *cs++ = MI_LOAD_REGISTER_IMM(num_rings); for_each_engine(signaller, i915, id) { if (signaller == engine) continue; last_reg = RING_PSMI_CTL(signaller->mmio_base); *cs++ = i915_mmio_reg_offset(last_reg); *cs++ = _MASKED_BIT_DISABLE( GEN6_PSMI_SLEEP_MSG_DISABLE); } /* Insert a delay before the next switch! */ *cs++ = MI_STORE_REGISTER_MEM | MI_SRM_LRM_GLOBAL_GTT; *cs++ = i915_mmio_reg_offset(last_reg); *cs++ = i915_ggtt_offset(engine->scratch); *cs++ = MI_NOOP; } *cs++ = MI_ARB_ON_OFF | MI_ARB_ENABLE; } intel_ring_advance(rq, cs); return 0; } static int remap_l3(struct i915_request *rq, int slice) { u32 *cs, *remap_info = rq->i915->l3_parity.remap_info[slice]; int i; if (!remap_info) return 0; cs = intel_ring_begin(rq, GEN7_L3LOG_SIZE/4 * 2 + 2); if (IS_ERR(cs)) return PTR_ERR(cs); /* * Note: We do not worry about the concurrent register cacheline hang * here because no other code should access these registers other than * at initialization time. */ *cs++ = MI_LOAD_REGISTER_IMM(GEN7_L3LOG_SIZE/4); for (i = 0; i < GEN7_L3LOG_SIZE/4; i++) { *cs++ = i915_mmio_reg_offset(GEN7_L3LOG(slice, i)); *cs++ = remap_info[i]; } *cs++ = MI_NOOP; intel_ring_advance(rq, cs); return 0; } static int switch_context(struct i915_request *rq) { struct intel_engine_cs *engine = rq->engine; struct i915_gem_context *ctx = rq->gem_context; struct i915_hw_ppgtt *ppgtt = ctx->ppgtt ?: rq->i915->mm.aliasing_ppgtt; unsigned int unwind_mm = 0; u32 hw_flags = 0; int ret, i; lockdep_assert_held(&rq->i915->drm.struct_mutex); GEM_BUG_ON(HAS_EXECLISTS(rq->i915)); if (ppgtt) { ret = load_pd_dir(rq, ppgtt); if (ret) goto err; if (intel_engine_flag(engine) & ppgtt->pd_dirty_rings) { unwind_mm = intel_engine_flag(engine); ppgtt->pd_dirty_rings &= ~unwind_mm; hw_flags = MI_FORCE_RESTORE; } } if (rq->hw_context->state) { GEM_BUG_ON(engine->id != RCS); /* * The kernel context(s) is treated as pure scratch and is not * expected to retain any state (as we sacrifice it during * suspend and on resume it may be corrupted). This is ok, * as nothing actually executes using the kernel context; it * is purely used for flushing user contexts. */ if (i915_gem_context_is_kernel(ctx)) hw_flags = MI_RESTORE_INHIBIT; ret = mi_set_context(rq, hw_flags); if (ret) goto err_mm; } if (ppgtt) { ret = flush_pd_dir(rq); if (ret) goto err_mm; } if (ctx->remap_slice) { for (i = 0; i < MAX_L3_SLICES; i++) { if (!(ctx->remap_slice & BIT(i))) continue; ret = remap_l3(rq, i); if (ret) goto err_mm; } ctx->remap_slice = 0; } return 0; err_mm: if (unwind_mm) ppgtt->pd_dirty_rings |= unwind_mm; err: return ret; } static int ring_request_alloc(struct i915_request *request) { int ret; GEM_BUG_ON(!request->hw_context->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; ret = intel_ring_wait_for_space(request->ring, request->reserved_space); if (ret) return ret; ret = switch_context(request); if (ret) return ret; request->reserved_space -= LEGACY_REQUEST_SIZE; return 0; } static noinline int wait_for_space(struct intel_ring *ring, unsigned int bytes) { struct i915_request *target; long timeout; lockdep_assert_held(&ring->vma->vm->i915->drm.struct_mutex); if (intel_ring_update_space(ring) >= bytes) return 0; GEM_BUG_ON(list_empty(&ring->request_list)); list_for_each_entry(target, &ring->request_list, ring_link) { /* Would completion of this request free enough space? */ if (bytes <= __intel_ring_space(target->postfix, ring->emit, ring->size)) break; } if (WARN_ON(&target->ring_link == &ring->request_list)) return -ENOSPC; timeout = i915_request_wait(target, I915_WAIT_INTERRUPTIBLE | I915_WAIT_LOCKED, MAX_SCHEDULE_TIMEOUT); if (timeout < 0) return timeout; i915_request_retire_upto(target); intel_ring_update_space(ring); GEM_BUG_ON(ring->space < bytes); return 0; } int intel_ring_wait_for_space(struct intel_ring *ring, unsigned int bytes) { GEM_BUG_ON(bytes > ring->effective_size); if (unlikely(bytes > ring->effective_size - ring->emit)) bytes += ring->size - ring->emit; if (unlikely(bytes > ring->space)) { int ret = wait_for_space(ring, bytes); if (unlikely(ret)) return ret; } GEM_BUG_ON(ring->space < bytes); return 0; } u32 *intel_ring_begin(struct i915_request *rq, unsigned int num_dwords) { struct intel_ring *ring = rq->ring; const unsigned int remain_usable = ring->effective_size - ring->emit; const unsigned int bytes = num_dwords * sizeof(u32); unsigned int need_wrap = 0; unsigned int total_bytes; u32 *cs; /* Packets must be qword aligned. */ GEM_BUG_ON(num_dwords & 1); total_bytes = bytes + rq->reserved_space; GEM_BUG_ON(total_bytes > ring->effective_size); if (unlikely(total_bytes > remain_usable)) { const int remain_actual = ring->size - ring->emit; if (bytes > remain_usable) { /* * Not enough space for the basic request. So need to * flush out the remainder and then wait for * base + reserved. */ total_bytes += remain_actual; need_wrap = remain_actual | 1; } else { /* * 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 from the start of ringbuffer. */ total_bytes = rq->reserved_space + remain_actual; } } if (unlikely(total_bytes > ring->space)) { int ret; /* * 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_request_alloc() and i915_request_add(). */ GEM_BUG_ON(!rq->reserved_space); ret = wait_for_space(ring, total_bytes); if (unlikely(ret)) return ERR_PTR(ret); } if (unlikely(need_wrap)) { need_wrap &= ~1; GEM_BUG_ON(need_wrap > ring->space); GEM_BUG_ON(ring->emit + need_wrap > ring->size); GEM_BUG_ON(!IS_ALIGNED(need_wrap, sizeof(u64))); /* Fill the tail with MI_NOOP */ memset64(ring->vaddr + ring->emit, 0, need_wrap / sizeof(u64)); ring->space -= need_wrap; ring->emit = 0; } GEM_BUG_ON(ring->emit > ring->size - bytes); GEM_BUG_ON(ring->space < bytes); cs = ring->vaddr + ring->emit; GEM_DEBUG_EXEC(memset32(cs, POISON_INUSE, bytes / sizeof(*cs))); ring->emit += bytes; ring->space -= bytes; return cs; } /* Align the ring tail to a cacheline boundary */ int intel_ring_cacheline_align(struct i915_request *rq) { int num_dwords; void *cs; num_dwords = (rq->ring->emit & (CACHELINE_BYTES - 1)) / sizeof(u32); if (num_dwords == 0) return 0; num_dwords = CACHELINE_DWORDS - num_dwords; GEM_BUG_ON(num_dwords & 1); cs = intel_ring_begin(rq, num_dwords); if (IS_ERR(cs)) return PTR_ERR(cs); memset64(cs, (u64)MI_NOOP << 32 | MI_NOOP, num_dwords / 2); intel_ring_advance(rq, cs); GEM_BUG_ON(rq->ring->emit & (CACHELINE_BYTES - 1)); return 0; } static void gen6_bsd_submit_request(struct i915_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, 1000, 0, NULL)) 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 i915_request *rq, u32 mode) { u32 cmd, *cs; cs = intel_ring_begin(rq, 4); if (IS_ERR(cs)) return PTR_ERR(cs); cmd = MI_FLUSH_DW; /* 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; *cs++ = 0; *cs++ = MI_NOOP; intel_ring_advance(rq, cs); return 0; } static int hsw_emit_bb_start(struct i915_request *rq, u64 offset, u32 len, unsigned int dispatch_flags) { u32 *cs; cs = intel_ring_begin(rq, 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(rq, cs); return 0; } static int gen6_emit_bb_start(struct i915_request *rq, u64 offset, u32 len, unsigned int dispatch_flags) { u32 *cs; cs = intel_ring_begin(rq, 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(rq, cs); return 0; } /* Blitter support (SandyBridge+) */ static int gen6_ring_flush(struct i915_request *rq, u32 mode) { u32 cmd, *cs; cs = intel_ring_begin(rq, 4); if (IS_ERR(cs)) return PTR_ERR(cs); cmd = MI_FLUSH_DW; /* 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; *cs++ = 0; *cs++ = MI_NOOP; intel_ring_advance(rq, cs); return 0; } static void intel_ring_init_semaphores(struct drm_i915_private *dev_priv, struct intel_engine_cs *engine) { int i; if (!HAS_LEGACY_SEMAPHORES(dev_priv)) return; GEM_BUG_ON(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. */ 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; } } static void intel_ring_init_irq(struct drm_i915_private *dev_priv, struct intel_engine_cs *engine) { 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 i9xx_set_default_submission(struct intel_engine_cs *engine) { engine->submit_request = i9xx_submit_request; engine->cancel_requests = cancel_requests; engine->park = NULL; engine->unpark = NULL; } static void gen6_bsd_set_default_submission(struct intel_engine_cs *engine) { i9xx_set_default_submission(engine); engine->submit_request = gen6_bsd_submit_request; } static void intel_ring_default_vfuncs(struct drm_i915_private *dev_priv, struct intel_engine_cs *engine) { /* gen8+ are only supported with execlists */ GEM_BUG_ON(INTEL_GEN(dev_priv) >= 8); intel_ring_init_irq(dev_priv, engine); intel_ring_init_semaphores(dev_priv, engine); engine->init_hw = init_ring_common; engine->reset.prepare = reset_prepare; engine->reset.reset = reset_ring; engine->reset.finish = reset_finish; engine->context_pin = intel_ring_context_pin; engine->request_alloc = ring_request_alloc; engine->emit_breadcrumb = i9xx_emit_breadcrumb; engine->emit_breadcrumb_sz = i9xx_emit_breadcrumb_sz; if (HAS_LEGACY_SEMAPHORES(dev_priv)) { int num_rings; engine->emit_breadcrumb = gen6_sema_emit_breadcrumb; num_rings = INTEL_INFO(dev_priv)->num_rings - 1; engine->emit_breadcrumb_sz += num_rings * 3; if (num_rings & 1) engine->emit_breadcrumb_sz++; } engine->set_default_submission = i9xx_set_default_submission; 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; engine->irq_enable_mask = GT_RENDER_USER_INTERRUPT; 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; ret = intel_init_ring_buffer(engine); 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->set_default_submission = gen6_bsd_set_default_submission; engine->emit_flush = gen6_bsd_ring_flush; engine->irq_enable_mask = GT_BSD_USER_INTERRUPT; } else { 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); } 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; 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; 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); }