// SPDX-License-Identifier: MIT /* * Copyright © 2008-2021 Intel Corporation */ #include "gen2_engine_cs.h" #include "gen6_engine_cs.h" #include "gen6_ppgtt.h" #include "gen7_renderclear.h" #include "i915_drv.h" #include "i915_mitigations.h" #include "intel_breadcrumbs.h" #include "intel_context.h" #include "intel_gt.h" #include "intel_gt_irq.h" #include "intel_reset.h" #include "intel_ring.h" #include "shmem_utils.h" #include "intel_engine_heartbeat.h" #include "intel_engine_pm.h" /* Rough estimate of the typical request size, performing a flush, * set-context and then emitting the batch. */ #define LEGACY_REQUEST_SIZE 200 static void set_hwstam(struct intel_engine_cs *engine, u32 mask) { /* * Keep the render interrupt unmasked as this papers over * lost interrupts following a reset. */ if (engine->class == RENDER_CLASS) { if (GRAPHICS_VER(engine->i915) >= 6) mask &= ~BIT(0); else mask &= ~I915_USER_INTERRUPT; } intel_engine_set_hwsp_writemask(engine, mask); } static void set_hws_pga(struct intel_engine_cs *engine, phys_addr_t phys) { u32 addr; addr = lower_32_bits(phys); if (GRAPHICS_VER(engine->i915) >= 4) addr |= (phys >> 28) & 0xf0; intel_uncore_write(engine->uncore, HWS_PGA, addr); } static struct page *status_page(struct intel_engine_cs *engine) { struct drm_i915_gem_object *obj = engine->status_page.vma->obj; GEM_BUG_ON(!i915_gem_object_has_pinned_pages(obj)); return sg_page(obj->mm.pages->sgl); } static void ring_setup_phys_status_page(struct intel_engine_cs *engine) { set_hws_pga(engine, PFN_PHYS(page_to_pfn(status_page(engine)))); set_hwstam(engine, ~0u); } static void set_hwsp(struct intel_engine_cs *engine, u32 offset) { i915_reg_t hwsp; /* * The ring status page addresses are no longer next to the rest of * the ring registers as of gen7. */ if (GRAPHICS_VER(engine->i915) == 7) { 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); fallthrough; case RCS0: hwsp = RENDER_HWS_PGA_GEN7; break; case BCS0: hwsp = BLT_HWS_PGA_GEN7; break; case VCS0: hwsp = BSD_HWS_PGA_GEN7; break; case VECS0: hwsp = VEBOX_HWS_PGA_GEN7; break; } } else if (GRAPHICS_VER(engine->i915) == 6) { hwsp = RING_HWS_PGA_GEN6(engine->mmio_base); } else { hwsp = RING_HWS_PGA(engine->mmio_base); } intel_uncore_write_fw(engine->uncore, hwsp, offset); intel_uncore_posting_read_fw(engine->uncore, hwsp); } static void flush_cs_tlb(struct intel_engine_cs *engine) { if (!IS_GRAPHICS_VER(engine->i915, 6, 7)) return; /* ring should be idle before issuing a sync flush*/ GEM_DEBUG_WARN_ON((ENGINE_READ(engine, RING_MI_MODE) & MODE_IDLE) == 0); ENGINE_WRITE_FW(engine, RING_INSTPM, _MASKED_BIT_ENABLE(INSTPM_TLB_INVALIDATE | INSTPM_SYNC_FLUSH)); if (__intel_wait_for_register_fw(engine->uncore, RING_INSTPM(engine->mmio_base), INSTPM_SYNC_FLUSH, 0, 2000, 0, NULL)) ENGINE_TRACE(engine, "wait for SyncFlush to complete for TLB invalidation timed out\n"); } static void ring_setup_status_page(struct intel_engine_cs *engine) { set_hwsp(engine, i915_ggtt_offset(engine->status_page.vma)); set_hwstam(engine, ~0u); flush_cs_tlb(engine); } static struct i915_address_space *vm_alias(struct i915_address_space *vm) { if (i915_is_ggtt(vm)) vm = &i915_vm_to_ggtt(vm)->alias->vm; return vm; } static u32 pp_dir(struct i915_address_space *vm) { return to_gen6_ppgtt(i915_vm_to_ppgtt(vm))->pp_dir; } static void set_pp_dir(struct intel_engine_cs *engine) { struct i915_address_space *vm = vm_alias(engine->gt->vm); if (!vm) return; ENGINE_WRITE_FW(engine, RING_PP_DIR_DCLV, PP_DIR_DCLV_2G); ENGINE_WRITE_FW(engine, RING_PP_DIR_BASE, pp_dir(vm)); if (GRAPHICS_VER(engine->i915) >= 7) { ENGINE_WRITE_FW(engine, RING_MODE_GEN7, _MASKED_BIT_ENABLE(GFX_PPGTT_ENABLE)); } } static bool stop_ring(struct intel_engine_cs *engine) { /* Empty the ring by skipping to the end */ ENGINE_WRITE_FW(engine, RING_HEAD, ENGINE_READ_FW(engine, RING_TAIL)); ENGINE_POSTING_READ(engine, RING_HEAD); /* The ring must be empty before it is disabled */ ENGINE_WRITE_FW(engine, RING_CTL, 0); ENGINE_POSTING_READ(engine, RING_CTL); /* Then reset the disabled ring */ ENGINE_WRITE_FW(engine, RING_HEAD, 0); ENGINE_WRITE_FW(engine, RING_TAIL, 0); return (ENGINE_READ_FW(engine, RING_HEAD) & HEAD_ADDR) == 0; } static int xcs_resume(struct intel_engine_cs *engine) { struct intel_ring *ring = engine->legacy.ring; ENGINE_TRACE(engine, "ring:{HEAD:%04x, TAIL:%04x}\n", ring->head, ring->tail); /* * Double check the ring is empty & disabled before we resume. Called * from atomic context during PCI probe, so _hardirq(). */ intel_synchronize_hardirq(engine->i915); if (!stop_ring(engine)) goto err; if (HWS_NEEDS_PHYSICAL(engine->i915)) ring_setup_phys_status_page(engine); else ring_setup_status_page(engine); intel_breadcrumbs_reset(engine->breadcrumbs); /* Enforce ordering by reading HEAD register back */ ENGINE_POSTING_READ(engine, RING_HEAD); /* * 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. */ ENGINE_WRITE_FW(engine, RING_START, i915_ggtt_offset(ring->vma)); /* 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); set_pp_dir(engine); /* First wake the ring up to an empty/idle ring */ ENGINE_WRITE_FW(engine, RING_HEAD, ring->head); ENGINE_WRITE_FW(engine, RING_TAIL, ring->head); ENGINE_POSTING_READ(engine, RING_TAIL); ENGINE_WRITE_FW(engine, RING_CTL, RING_CTL_SIZE(ring->size) | RING_VALID); /* If the head is still not zero, the ring is dead */ if (__intel_wait_for_register_fw(engine->uncore, RING_CTL(engine->mmio_base), RING_VALID, RING_VALID, 5000, 0, NULL)) goto err; if (GRAPHICS_VER(engine->i915) > 2) ENGINE_WRITE_FW(engine, RING_MI_MODE, _MASKED_BIT_DISABLE(STOP_RING)); /* Now awake, let it get started */ if (ring->tail != ring->head) { ENGINE_WRITE_FW(engine, RING_TAIL, ring->tail); ENGINE_POSTING_READ(engine, RING_TAIL); } /* Papering over lost _interrupts_ immediately following the restart */ intel_engine_signal_breadcrumbs(engine); return 0; err: drm_err(&engine->i915->drm, "%s initialization failed; " "ctl %08x (valid? %d) head %08x [%08x] tail %08x [%08x] start %08x [expected %08x]\n", engine->name, ENGINE_READ(engine, RING_CTL), ENGINE_READ(engine, RING_CTL) & RING_VALID, ENGINE_READ(engine, RING_HEAD), ring->head, ENGINE_READ(engine, RING_TAIL), ring->tail, ENGINE_READ(engine, RING_START), i915_ggtt_offset(ring->vma)); return -EIO; } static void sanitize_hwsp(struct intel_engine_cs *engine) { struct intel_timeline *tl; list_for_each_entry(tl, &engine->status_page.timelines, engine_link) intel_timeline_reset_seqno(tl); } static void xcs_sanitize(struct intel_engine_cs *engine) { /* * Poison residual state on resume, in case the suspend didn't! * * We have to assume that across suspend/resume (or other loss * of control) that the contents of our pinned buffers has been * lost, replaced by garbage. Since this doesn't always happen, * let's poison such state so that we more quickly spot when * we falsely assume it has been preserved. */ if (IS_ENABLED(CONFIG_DRM_I915_DEBUG_GEM)) memset(engine->status_page.addr, POISON_INUSE, PAGE_SIZE); /* * The kernel_context HWSP is stored in the status_page. As above, * that may be lost on resume/initialisation, and so we need to * reset the value in the HWSP. */ sanitize_hwsp(engine); /* And scrub the dirty cachelines for the HWSP */ drm_clflush_virt_range(engine->status_page.addr, PAGE_SIZE); intel_engine_reset_pinned_contexts(engine); } static void reset_prepare(struct intel_engine_cs *engine) { /* * We stop engines, otherwise we might get failed reset and a * dead gpu (on elk). Also as modern gpu as kbl can suffer * from system hang if batchbuffer is progressing when * the reset is issued, regardless of READY_TO_RESET ack. * Thus assume it is best to stop engines on all gens * where we have a gpu reset. * * WaKBLVECSSemaphoreWaitPoll:kbl (on ALL_ENGINES) * * WaMediaResetMainRingCleanup:ctg,elk (presumably) * WaClearRingBufHeadRegAtInit:ctg,elk * * FIXME: Wa for more modern gens needs to be validated */ ENGINE_TRACE(engine, "\n"); intel_engine_stop_cs(engine); if (!stop_ring(engine)) { /* G45 ring initialization often fails to reset head to zero */ ENGINE_TRACE(engine, "HEAD not reset to zero, " "{ CTL:%08x, HEAD:%08x, TAIL:%08x, START:%08x }\n", ENGINE_READ_FW(engine, RING_CTL), ENGINE_READ_FW(engine, RING_HEAD), ENGINE_READ_FW(engine, RING_TAIL), ENGINE_READ_FW(engine, RING_START)); if (!stop_ring(engine)) { drm_err(&engine->i915->drm, "failed to set %s head to zero " "ctl %08x head %08x tail %08x start %08x\n", engine->name, ENGINE_READ_FW(engine, RING_CTL), ENGINE_READ_FW(engine, RING_HEAD), ENGINE_READ_FW(engine, RING_TAIL), ENGINE_READ_FW(engine, RING_START)); } } } static void reset_rewind(struct intel_engine_cs *engine, bool stalled) { struct i915_request *pos, *rq; unsigned long flags; u32 head; rq = NULL; spin_lock_irqsave(&engine->sched_engine->lock, flags); rcu_read_lock(); list_for_each_entry(pos, &engine->sched_engine->requests, sched.link) { if (!__i915_request_is_complete(pos)) { rq = pos; break; } } rcu_read_unlock(); /* * The guilty request will get skipped on a hung engine. * * Users of client default contexts do not rely on logical * state preserved between batches so it is safe to execute * queued requests following the hang. Non default contexts * rely on preserved state, so skipping a batch loses the * evolution of the state and it needs to be considered corrupted. * Executing more queued batches on top of corrupted state is * risky. But we take the risk by trying to advance through * the queued requests in order to make the client behaviour * more predictable around resets, by not throwing away random * amount of batches it has prepared for execution. Sophisticated * clients can use gem_reset_stats_ioctl and dma fence status * (exported via sync_file info ioctl on explicit fences) to observe * when it loses the context state and should rebuild accordingly. * * The context ban, and ultimately the client ban, mechanism are safety * valves if client submission ends up resulting in nothing more than * subsequent hangs. */ if (rq) { /* * 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. */ __i915_request_reset(rq, stalled); GEM_BUG_ON(rq->ring != engine->legacy.ring); head = rq->head; } else { head = engine->legacy.ring->tail; } engine->legacy.ring->head = intel_ring_wrap(engine->legacy.ring, head); spin_unlock_irqrestore(&engine->sched_engine->lock, flags); } static void reset_finish(struct intel_engine_cs *engine) { } static void reset_cancel(struct intel_engine_cs *engine) { struct i915_request *request; unsigned long flags; spin_lock_irqsave(&engine->sched_engine->lock, flags); /* Mark all submitted requests as skipped. */ list_for_each_entry(request, &engine->sched_engine->requests, sched.link) i915_request_put(i915_request_mark_eio(request)); intel_engine_signal_breadcrumbs(engine); /* Remaining _unready_ requests will be nop'ed when submitted */ spin_unlock_irqrestore(&engine->sched_engine->lock, flags); } static void i9xx_submit_request(struct i915_request *request) { i915_request_submit(request); wmb(); /* paranoid flush writes out of the WCB before mmio */ ENGINE_WRITE(request->engine, RING_TAIL, intel_ring_set_tail(request->ring, request->tail)); } static void __ring_context_fini(struct intel_context *ce) { i915_vma_put(ce->state); } static void ring_context_destroy(struct kref *ref) { struct intel_context *ce = container_of(ref, typeof(*ce), ref); GEM_BUG_ON(intel_context_is_pinned(ce)); if (ce->state) __ring_context_fini(ce); intel_context_fini(ce); intel_context_free(ce); } static int ring_context_init_default_state(struct intel_context *ce, struct i915_gem_ww_ctx *ww) { struct drm_i915_gem_object *obj = ce->state->obj; void *vaddr; vaddr = i915_gem_object_pin_map(obj, I915_MAP_WB); if (IS_ERR(vaddr)) return PTR_ERR(vaddr); shmem_read(ce->engine->default_state, 0, vaddr, ce->engine->context_size); i915_gem_object_flush_map(obj); __i915_gem_object_release_map(obj); __set_bit(CONTEXT_VALID_BIT, &ce->flags); return 0; } static int ring_context_pre_pin(struct intel_context *ce, struct i915_gem_ww_ctx *ww, void **unused) { struct i915_address_space *vm; int err = 0; if (ce->engine->default_state && !test_bit(CONTEXT_VALID_BIT, &ce->flags)) { err = ring_context_init_default_state(ce, ww); if (err) return err; } vm = vm_alias(ce->vm); if (vm) err = gen6_ppgtt_pin(i915_vm_to_ppgtt((vm)), ww); return err; } static void __context_unpin_ppgtt(struct intel_context *ce) { struct i915_address_space *vm; vm = vm_alias(ce->vm); if (vm) gen6_ppgtt_unpin(i915_vm_to_ppgtt(vm)); } static void ring_context_unpin(struct intel_context *ce) { } static void ring_context_post_unpin(struct intel_context *ce) { __context_unpin_ppgtt(ce); } 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_shmem(i915, engine->context_size); if (IS_ERR(obj)) return ERR_CAST(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)) i915_gem_object_set_cache_coherency(obj, I915_CACHE_L3_LLC); vma = i915_vma_instance(obj, &engine->gt->ggtt->vm, NULL); if (IS_ERR(vma)) { err = PTR_ERR(vma); goto err_obj; } return vma; err_obj: i915_gem_object_put(obj); return ERR_PTR(err); } static int ring_context_alloc(struct intel_context *ce) { struct intel_engine_cs *engine = ce->engine; /* One ringbuffer to rule them all */ GEM_BUG_ON(!engine->legacy.ring); ce->ring = engine->legacy.ring; ce->timeline = intel_timeline_get(engine->legacy.timeline); GEM_BUG_ON(ce->state); if (engine->context_size) { struct i915_vma *vma; vma = alloc_context_vma(engine); if (IS_ERR(vma)) return PTR_ERR(vma); ce->state = vma; } return 0; } static int ring_context_pin(struct intel_context *ce, void *unused) { return 0; } static void ring_context_reset(struct intel_context *ce) { intel_ring_reset(ce->ring, ce->ring->emit); clear_bit(CONTEXT_VALID_BIT, &ce->flags); } static void ring_context_ban(struct intel_context *ce, struct i915_request *rq) { struct intel_engine_cs *engine; if (!rq || !i915_request_is_active(rq)) return; engine = rq->engine; lockdep_assert_held(&engine->sched_engine->lock); list_for_each_entry_continue(rq, &engine->sched_engine->requests, sched.link) if (rq->context == ce) { i915_request_set_error_once(rq, -EIO); __i915_request_skip(rq); } } static void ring_context_cancel_request(struct intel_context *ce, struct i915_request *rq) { struct intel_engine_cs *engine = NULL; i915_request_active_engine(rq, &engine); if (engine && intel_engine_pulse(engine)) intel_gt_handle_error(engine->gt, engine->mask, 0, "request cancellation by %s", current->comm); } static const struct intel_context_ops ring_context_ops = { .alloc = ring_context_alloc, .cancel_request = ring_context_cancel_request, .ban = ring_context_ban, .pre_pin = ring_context_pre_pin, .pin = ring_context_pin, .unpin = ring_context_unpin, .post_unpin = ring_context_post_unpin, .enter = intel_context_enter_engine, .exit = intel_context_exit_engine, .reset = ring_context_reset, .destroy = ring_context_destroy, }; static int load_pd_dir(struct i915_request *rq, struct i915_address_space *vm, u32 valid) { const struct intel_engine_cs * const engine = rq->engine; u32 *cs; cs = intel_ring_begin(rq, 12); if (IS_ERR(cs)) return PTR_ERR(cs); *cs++ = MI_LOAD_REGISTER_IMM(1); *cs++ = i915_mmio_reg_offset(RING_PP_DIR_DCLV(engine->mmio_base)); *cs++ = valid; *cs++ = MI_LOAD_REGISTER_IMM(1); *cs++ = i915_mmio_reg_offset(RING_PP_DIR_BASE(engine->mmio_base)); *cs++ = pp_dir(vm); /* 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->mmio_base)); *cs++ = intel_gt_scratch_offset(engine->gt, INTEL_GT_SCRATCH_FIELD_DEFAULT); *cs++ = MI_LOAD_REGISTER_IMM(1); *cs++ = i915_mmio_reg_offset(RING_INSTPM(engine->mmio_base)); *cs++ = _MASKED_BIT_ENABLE(INSTPM_TLB_INVALIDATE); intel_ring_advance(rq, cs); return rq->engine->emit_flush(rq, EMIT_FLUSH); } static int mi_set_context(struct i915_request *rq, struct intel_context *ce, u32 flags) { struct intel_engine_cs *engine = rq->engine; struct drm_i915_private *i915 = engine->i915; enum intel_engine_id id; const int num_engines = IS_HASWELL(i915) ? engine->gt->info.num_engines - 1 : 0; bool force_restore = false; int len; u32 *cs; len = 4; if (GRAPHICS_VER(i915) == 7) len += 2 + (num_engines ? 4 * num_engines + 6 : 0); else if (GRAPHICS_VER(i915) == 5) len += 2; 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 (GRAPHICS_VER(i915) == 7) { *cs++ = MI_ARB_ON_OFF | MI_ARB_DISABLE; if (num_engines) { struct intel_engine_cs *signaller; *cs++ = MI_LOAD_REGISTER_IMM(num_engines); for_each_engine(signaller, engine->gt, 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); } } } else if (GRAPHICS_VER(i915) == 5) { /* * This w/a is only listed for pre-production ilk a/b steppings, * but is also mentioned for programming the powerctx. To be * safe, just apply the workaround; we do not use SyncFlush so * this should never take effect and so be a no-op! */ *cs++ = MI_SUSPEND_FLUSH | MI_SUSPEND_FLUSH_EN; } 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(engine->kernel_context->state) | MI_MM_SPACE_GTT | MI_RESTORE_INHIBIT; } *cs++ = MI_NOOP; *cs++ = MI_SET_CONTEXT; *cs++ = i915_ggtt_offset(ce->state) | flags; /* * w/a: MI_SET_CONTEXT must always be followed by MI_NOOP * WaMiSetContext_Hang:snb,ivb,vlv */ *cs++ = MI_NOOP; if (GRAPHICS_VER(i915) == 7) { if (num_engines) { struct intel_engine_cs *signaller; i915_reg_t last_reg = {}; /* keep gcc quiet */ *cs++ = MI_LOAD_REGISTER_IMM(num_engines); for_each_engine(signaller, engine->gt, 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++ = intel_gt_scratch_offset(engine->gt, INTEL_GT_SCRATCH_FIELD_DEFAULT); *cs++ = MI_NOOP; } *cs++ = MI_ARB_ON_OFF | MI_ARB_ENABLE; } else if (GRAPHICS_VER(i915) == 5) { *cs++ = MI_SUSPEND_FLUSH; } intel_ring_advance(rq, cs); return 0; } static int remap_l3_slice(struct i915_request *rq, int slice) { #define L3LOG_DW (GEN7_L3LOG_SIZE / sizeof(u32)) u32 *cs, *remap_info = rq->engine->i915->l3_parity.remap_info[slice]; int i; if (!remap_info) return 0; cs = intel_ring_begin(rq, L3LOG_DW * 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(L3LOG_DW); for (i = 0; i < L3LOG_DW; i++) { *cs++ = i915_mmio_reg_offset(GEN7_L3LOG(slice, i)); *cs++ = remap_info[i]; } *cs++ = MI_NOOP; intel_ring_advance(rq, cs); return 0; #undef L3LOG_DW } static int remap_l3(struct i915_request *rq) { struct i915_gem_context *ctx = i915_request_gem_context(rq); int i, err; if (!ctx || !ctx->remap_slice) return 0; for (i = 0; i < MAX_L3_SLICES; i++) { if (!(ctx->remap_slice & BIT(i))) continue; err = remap_l3_slice(rq, i); if (err) return err; } ctx->remap_slice = 0; return 0; } static int switch_mm(struct i915_request *rq, struct i915_address_space *vm) { int ret; if (!vm) return 0; ret = rq->engine->emit_flush(rq, EMIT_FLUSH); if (ret) return ret; /* * Not only do we need a full barrier (post-sync write) after * invalidating the TLBs, but we need to wait a little bit * longer. Whether this is merely delaying us, or the * subsequent flush is a key part of serialising with the * post-sync op, this extra pass appears vital before a * mm switch! */ ret = load_pd_dir(rq, vm, PP_DIR_DCLV_2G); if (ret) return ret; return rq->engine->emit_flush(rq, EMIT_INVALIDATE); } static int clear_residuals(struct i915_request *rq) { struct intel_engine_cs *engine = rq->engine; int ret; ret = switch_mm(rq, vm_alias(engine->kernel_context->vm)); if (ret) return ret; if (engine->kernel_context->state) { ret = mi_set_context(rq, engine->kernel_context, MI_MM_SPACE_GTT | MI_RESTORE_INHIBIT); if (ret) return ret; } ret = engine->emit_bb_start(rq, engine->wa_ctx.vma->node.start, 0, 0); if (ret) return ret; ret = engine->emit_flush(rq, EMIT_FLUSH); if (ret) return ret; /* Always invalidate before the next switch_mm() */ return engine->emit_flush(rq, EMIT_INVALIDATE); } static int switch_context(struct i915_request *rq) { struct intel_engine_cs *engine = rq->engine; struct intel_context *ce = rq->context; void **residuals = NULL; int ret; GEM_BUG_ON(HAS_EXECLISTS(engine->i915)); if (engine->wa_ctx.vma && ce != engine->kernel_context) { if (engine->wa_ctx.vma->private != ce && i915_mitigate_clear_residuals()) { ret = clear_residuals(rq); if (ret) return ret; residuals = &engine->wa_ctx.vma->private; } } ret = switch_mm(rq, vm_alias(ce->vm)); if (ret) return ret; if (ce->state) { u32 flags; GEM_BUG_ON(engine->id != RCS0); /* For resource streamer on HSW+ and power context elsewhere */ BUILD_BUG_ON(HSW_MI_RS_SAVE_STATE_EN != MI_SAVE_EXT_STATE_EN); BUILD_BUG_ON(HSW_MI_RS_RESTORE_STATE_EN != MI_RESTORE_EXT_STATE_EN); flags = MI_SAVE_EXT_STATE_EN | MI_MM_SPACE_GTT; if (test_bit(CONTEXT_VALID_BIT, &ce->flags)) flags |= MI_RESTORE_EXT_STATE_EN; else flags |= MI_RESTORE_INHIBIT; ret = mi_set_context(rq, ce, flags); if (ret) return ret; } ret = remap_l3(rq); if (ret) return ret; /* * Now past the point of no return, this request _will_ be emitted. * * Or at least this preamble will be emitted, the request may be * interrupted prior to submitting the user payload. If so, we * still submit the "empty" request in order to preserve global * state tracking such as this, our tracking of the current * dirty context. */ if (residuals) { intel_context_put(*residuals); *residuals = intel_context_get(ce); } return 0; } static int ring_request_alloc(struct i915_request *request) { int ret; GEM_BUG_ON(!intel_context_is_pinned(request->context)); GEM_BUG_ON(i915_request_timeline(request)->has_initial_breadcrumb); /* * 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; /* Unconditionally invalidate GPU caches and TLBs. */ ret = request->engine->emit_flush(request, EMIT_INVALIDATE); if (ret) return ret; ret = switch_context(request); if (ret) return ret; request->reserved_space -= LEGACY_REQUEST_SIZE; return 0; } static void gen6_bsd_submit_request(struct i915_request *request) { struct intel_uncore *uncore = request->engine->uncore; intel_uncore_forcewake_get(uncore, 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. */ intel_uncore_write_fw(uncore, GEN6_BSD_SLEEP_PSMI_CONTROL, _MASKED_BIT_ENABLE(GEN6_BSD_SLEEP_MSG_DISABLE)); /* Clear the context id. Here be magic! */ intel_uncore_write64_fw(uncore, 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(uncore, GEN6_BSD_SLEEP_PSMI_CONTROL, GEN6_BSD_SLEEP_INDICATOR, 0, 1000, 0, NULL)) drm_err(&uncore->i915->drm, "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. */ intel_uncore_write_fw(uncore, GEN6_BSD_SLEEP_PSMI_CONTROL, _MASKED_BIT_DISABLE(GEN6_BSD_SLEEP_MSG_DISABLE)); intel_uncore_forcewake_put(uncore, FORCEWAKE_ALL); } static void i9xx_set_default_submission(struct intel_engine_cs *engine) { engine->submit_request = i9xx_submit_request; } static void gen6_bsd_set_default_submission(struct intel_engine_cs *engine) { engine->submit_request = gen6_bsd_submit_request; } static void ring_release(struct intel_engine_cs *engine) { struct drm_i915_private *dev_priv = engine->i915; drm_WARN_ON(&dev_priv->drm, GRAPHICS_VER(dev_priv) > 2 && (ENGINE_READ(engine, RING_MI_MODE) & MODE_IDLE) == 0); intel_engine_cleanup_common(engine); if (engine->wa_ctx.vma) { intel_context_put(engine->wa_ctx.vma->private); i915_vma_unpin_and_release(&engine->wa_ctx.vma, 0); } intel_ring_unpin(engine->legacy.ring); intel_ring_put(engine->legacy.ring); intel_timeline_unpin(engine->legacy.timeline); intel_timeline_put(engine->legacy.timeline); } static void irq_handler(struct intel_engine_cs *engine, u16 iir) { intel_engine_signal_breadcrumbs(engine); } static void setup_irq(struct intel_engine_cs *engine) { struct drm_i915_private *i915 = engine->i915; intel_engine_set_irq_handler(engine, irq_handler); if (GRAPHICS_VER(i915) >= 6) { engine->irq_enable = gen6_irq_enable; engine->irq_disable = gen6_irq_disable; } else if (GRAPHICS_VER(i915) >= 5) { engine->irq_enable = gen5_irq_enable; engine->irq_disable = gen5_irq_disable; } else if (GRAPHICS_VER(i915) >= 3) { engine->irq_enable = gen3_irq_enable; engine->irq_disable = gen3_irq_disable; } else { engine->irq_enable = gen2_irq_enable; engine->irq_disable = gen2_irq_disable; } } static void add_to_engine(struct i915_request *rq) { lockdep_assert_held(&rq->engine->sched_engine->lock); list_move_tail(&rq->sched.link, &rq->engine->sched_engine->requests); } static void remove_from_engine(struct i915_request *rq) { spin_lock_irq(&rq->engine->sched_engine->lock); list_del_init(&rq->sched.link); /* Prevent further __await_execution() registering a cb, then flush */ set_bit(I915_FENCE_FLAG_ACTIVE, &rq->fence.flags); spin_unlock_irq(&rq->engine->sched_engine->lock); i915_request_notify_execute_cb_imm(rq); } static void setup_common(struct intel_engine_cs *engine) { struct drm_i915_private *i915 = engine->i915; /* gen8+ are only supported with execlists */ GEM_BUG_ON(GRAPHICS_VER(i915) >= 8); setup_irq(engine); engine->resume = xcs_resume; engine->sanitize = xcs_sanitize; engine->reset.prepare = reset_prepare; engine->reset.rewind = reset_rewind; engine->reset.cancel = reset_cancel; engine->reset.finish = reset_finish; engine->add_active_request = add_to_engine; engine->remove_active_request = remove_from_engine; engine->cops = &ring_context_ops; engine->request_alloc = ring_request_alloc; /* * Using a global execution timeline; the previous final breadcrumb is * equivalent to our next initial bread so we can elide * engine->emit_init_breadcrumb(). */ engine->emit_fini_breadcrumb = gen3_emit_breadcrumb; if (GRAPHICS_VER(i915) == 5) engine->emit_fini_breadcrumb = gen5_emit_breadcrumb; engine->set_default_submission = i9xx_set_default_submission; if (GRAPHICS_VER(i915) >= 6) engine->emit_bb_start = gen6_emit_bb_start; else if (GRAPHICS_VER(i915) >= 4) engine->emit_bb_start = gen4_emit_bb_start; else if (IS_I830(i915) || IS_I845G(i915)) engine->emit_bb_start = i830_emit_bb_start; else engine->emit_bb_start = gen3_emit_bb_start; } static void setup_rcs(struct intel_engine_cs *engine) { struct drm_i915_private *i915 = engine->i915; if (HAS_L3_DPF(i915)) engine->irq_keep_mask = GT_RENDER_L3_PARITY_ERROR_INTERRUPT; engine->irq_enable_mask = GT_RENDER_USER_INTERRUPT; if (GRAPHICS_VER(i915) >= 7) { engine->emit_flush = gen7_emit_flush_rcs; engine->emit_fini_breadcrumb = gen7_emit_breadcrumb_rcs; } else if (GRAPHICS_VER(i915) == 6) { engine->emit_flush = gen6_emit_flush_rcs; engine->emit_fini_breadcrumb = gen6_emit_breadcrumb_rcs; } else if (GRAPHICS_VER(i915) == 5) { engine->emit_flush = gen4_emit_flush_rcs; } else { if (GRAPHICS_VER(i915) < 4) engine->emit_flush = gen2_emit_flush; else engine->emit_flush = gen4_emit_flush_rcs; engine->irq_enable_mask = I915_USER_INTERRUPT; } if (IS_HASWELL(i915)) engine->emit_bb_start = hsw_emit_bb_start; } static void setup_vcs(struct intel_engine_cs *engine) { struct drm_i915_private *i915 = engine->i915; if (GRAPHICS_VER(i915) >= 6) { /* gen6 bsd needs a special wa for tail updates */ if (GRAPHICS_VER(i915) == 6) engine->set_default_submission = gen6_bsd_set_default_submission; engine->emit_flush = gen6_emit_flush_vcs; engine->irq_enable_mask = GT_BSD_USER_INTERRUPT; if (GRAPHICS_VER(i915) == 6) engine->emit_fini_breadcrumb = gen6_emit_breadcrumb_xcs; else engine->emit_fini_breadcrumb = gen7_emit_breadcrumb_xcs; } else { engine->emit_flush = gen4_emit_flush_vcs; if (GRAPHICS_VER(i915) == 5) engine->irq_enable_mask = ILK_BSD_USER_INTERRUPT; else engine->irq_enable_mask = I915_BSD_USER_INTERRUPT; } } static void setup_bcs(struct intel_engine_cs *engine) { struct drm_i915_private *i915 = engine->i915; engine->emit_flush = gen6_emit_flush_xcs; engine->irq_enable_mask = GT_BLT_USER_INTERRUPT; if (GRAPHICS_VER(i915) == 6) engine->emit_fini_breadcrumb = gen6_emit_breadcrumb_xcs; else engine->emit_fini_breadcrumb = gen7_emit_breadcrumb_xcs; } static void setup_vecs(struct intel_engine_cs *engine) { struct drm_i915_private *i915 = engine->i915; GEM_BUG_ON(GRAPHICS_VER(i915) < 7); engine->emit_flush = gen6_emit_flush_xcs; engine->irq_enable_mask = PM_VEBOX_USER_INTERRUPT; engine->irq_enable = hsw_irq_enable_vecs; engine->irq_disable = hsw_irq_disable_vecs; engine->emit_fini_breadcrumb = gen7_emit_breadcrumb_xcs; } static int gen7_ctx_switch_bb_setup(struct intel_engine_cs * const engine, struct i915_vma * const vma) { return gen7_setup_clear_gpr_bb(engine, vma); } static int gen7_ctx_switch_bb_init(struct intel_engine_cs *engine, struct i915_gem_ww_ctx *ww, struct i915_vma *vma) { int err; err = i915_vma_pin_ww(vma, ww, 0, 0, PIN_USER | PIN_HIGH); if (err) return err; err = i915_vma_sync(vma); if (err) goto err_unpin; err = gen7_ctx_switch_bb_setup(engine, vma); if (err) goto err_unpin; engine->wa_ctx.vma = vma; return 0; err_unpin: i915_vma_unpin(vma); return err; } static struct i915_vma *gen7_ctx_vma(struct intel_engine_cs *engine) { struct drm_i915_gem_object *obj; struct i915_vma *vma; int size, err; if (GRAPHICS_VER(engine->i915) != 7 || engine->class != RENDER_CLASS) return NULL; err = gen7_ctx_switch_bb_setup(engine, NULL /* probe size */); if (err < 0) return ERR_PTR(err); if (!err) return NULL; size = ALIGN(err, PAGE_SIZE); obj = i915_gem_object_create_internal(engine->i915, size); if (IS_ERR(obj)) return ERR_CAST(obj); vma = i915_vma_instance(obj, engine->gt->vm, NULL); if (IS_ERR(vma)) { i915_gem_object_put(obj); return ERR_CAST(vma); } vma->private = intel_context_create(engine); /* dummy residuals */ if (IS_ERR(vma->private)) { err = PTR_ERR(vma->private); vma->private = NULL; i915_gem_object_put(obj); return ERR_PTR(err); } return vma; } int intel_ring_submission_setup(struct intel_engine_cs *engine) { struct i915_gem_ww_ctx ww; struct intel_timeline *timeline; struct intel_ring *ring; struct i915_vma *gen7_wa_vma; int err; setup_common(engine); switch (engine->class) { case RENDER_CLASS: setup_rcs(engine); break; case VIDEO_DECODE_CLASS: setup_vcs(engine); break; case COPY_ENGINE_CLASS: setup_bcs(engine); break; case VIDEO_ENHANCEMENT_CLASS: setup_vecs(engine); break; default: MISSING_CASE(engine->class); return -ENODEV; } timeline = intel_timeline_create_from_engine(engine, I915_GEM_HWS_SEQNO_ADDR); if (IS_ERR(timeline)) { err = PTR_ERR(timeline); goto err; } GEM_BUG_ON(timeline->has_initial_breadcrumb); ring = intel_engine_create_ring(engine, SZ_16K); if (IS_ERR(ring)) { err = PTR_ERR(ring); goto err_timeline; } GEM_BUG_ON(engine->legacy.ring); engine->legacy.ring = ring; engine->legacy.timeline = timeline; gen7_wa_vma = gen7_ctx_vma(engine); if (IS_ERR(gen7_wa_vma)) { err = PTR_ERR(gen7_wa_vma); goto err_ring; } i915_gem_ww_ctx_init(&ww, false); retry: err = i915_gem_object_lock(timeline->hwsp_ggtt->obj, &ww); if (!err && gen7_wa_vma) err = i915_gem_object_lock(gen7_wa_vma->obj, &ww); if (!err && engine->legacy.ring->vma->obj) err = i915_gem_object_lock(engine->legacy.ring->vma->obj, &ww); if (!err) err = intel_timeline_pin(timeline, &ww); if (!err) { err = intel_ring_pin(ring, &ww); if (err) intel_timeline_unpin(timeline); } if (err) goto out; GEM_BUG_ON(timeline->hwsp_ggtt != engine->status_page.vma); if (gen7_wa_vma) { err = gen7_ctx_switch_bb_init(engine, &ww, gen7_wa_vma); if (err) { intel_ring_unpin(ring); intel_timeline_unpin(timeline); } } out: if (err == -EDEADLK) { err = i915_gem_ww_ctx_backoff(&ww); if (!err) goto retry; } i915_gem_ww_ctx_fini(&ww); if (err) goto err_gen7_put; /* Finally, take ownership and responsibility for cleanup! */ engine->release = ring_release; return 0; err_gen7_put: if (gen7_wa_vma) { intel_context_put(gen7_wa_vma->private); i915_gem_object_put(gen7_wa_vma->obj); } err_ring: intel_ring_put(ring); err_timeline: intel_timeline_put(timeline); err: intel_engine_cleanup_common(engine); return err; } #if IS_ENABLED(CONFIG_DRM_I915_SELFTEST) #include "selftest_ring_submission.c" #endif