diff options
Diffstat (limited to 'drivers/gpu/drm/i915/intel_lrc.c')
| -rw-r--r-- | drivers/gpu/drm/i915/intel_lrc.c | 417 |
1 files changed, 248 insertions, 169 deletions
diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c index bec232acc8d7..4e0a351bfbca 100644 --- a/drivers/gpu/drm/i915/intel_lrc.c +++ b/drivers/gpu/drm/i915/intel_lrc.c @@ -233,7 +233,7 @@ static inline bool need_preempt(const struct intel_engine_cs *engine, { int last_prio; - if (!intel_engine_has_preemption(engine)) + if (!engine->preempt_context) return false; if (i915_request_completed(rq)) @@ -429,13 +429,13 @@ __unwind_incomplete_requests(struct intel_engine_cs *engine) return active; } -void +struct i915_request * execlists_unwind_incomplete_requests(struct intel_engine_execlists *execlists) { struct intel_engine_cs *engine = container_of(execlists, typeof(*engine), execlists); - __unwind_incomplete_requests(engine); + return __unwind_incomplete_requests(engine); } static inline void @@ -893,96 +893,6 @@ invalidate_csb_entries(const u32 *first, const u32 *last) clflush((void *)last); } -static void reset_csb_pointers(struct intel_engine_execlists *execlists) -{ - const unsigned int reset_value = GEN8_CSB_ENTRIES - 1; - - /* - * After a reset, the HW starts writing into CSB entry [0]. We - * therefore have to set our HEAD pointer back one entry so that - * the *first* entry we check is entry 0. To complicate this further, - * as we don't wait for the first interrupt after reset, we have to - * fake the HW write to point back to the last entry so that our - * inline comparison of our cached head position against the last HW - * write works even before the first interrupt. - */ - execlists->csb_head = reset_value; - WRITE_ONCE(*execlists->csb_write, reset_value); - - invalidate_csb_entries(&execlists->csb_status[0], - &execlists->csb_status[GEN8_CSB_ENTRIES - 1]); -} - -static void nop_submission_tasklet(unsigned long data) -{ - /* The driver is wedged; don't process any more events. */ -} - -static void execlists_cancel_requests(struct intel_engine_cs *engine) -{ - struct intel_engine_execlists * const execlists = &engine->execlists; - struct i915_request *rq, *rn; - struct rb_node *rb; - unsigned long flags; - - GEM_TRACE("%s\n", engine->name); - - /* - * Before we call engine->cancel_requests(), we should have exclusive - * access to the submission state. This is arranged for us by the - * caller disabling the interrupt generation, the tasklet and other - * threads that may then access the same state, giving us a free hand - * to reset state. However, we still need to let lockdep be aware that - * we know this state may be accessed in hardirq context, so we - * disable the irq around this manipulation and we want to keep - * the spinlock focused on its duties and not accidentally conflate - * coverage to the submission's irq state. (Similarly, although we - * shouldn't need to disable irq around the manipulation of the - * submission's irq state, we also wish to remind ourselves that - * it is irq state.) - */ - spin_lock_irqsave(&engine->timeline.lock, flags); - - /* Cancel the requests on the HW and clear the ELSP tracker. */ - execlists_cancel_port_requests(execlists); - execlists_user_end(execlists); - - /* Mark all executing requests as skipped. */ - list_for_each_entry(rq, &engine->timeline.requests, link) { - if (!i915_request_signaled(rq)) - dma_fence_set_error(&rq->fence, -EIO); - - i915_request_mark_complete(rq); - } - - /* Flush the queued requests to the timeline list (for retiring). */ - while ((rb = rb_first_cached(&execlists->queue))) { - struct i915_priolist *p = to_priolist(rb); - int i; - - priolist_for_each_request_consume(rq, rn, p, i) { - list_del_init(&rq->sched.link); - __i915_request_submit(rq); - dma_fence_set_error(&rq->fence, -EIO); - i915_request_mark_complete(rq); - } - - rb_erase_cached(&p->node, &execlists->queue); - i915_priolist_free(p); - } - - /* Remaining _unready_ requests will be nop'ed when submitted */ - - execlists->queue_priority_hint = INT_MIN; - execlists->queue = RB_ROOT_CACHED; - GEM_BUG_ON(port_isset(execlists->port)); - - GEM_BUG_ON(__tasklet_is_enabled(&execlists->tasklet)); - execlists->tasklet.func = nop_submission_tasklet; - - spin_unlock_irqrestore(&engine->timeline.lock, flags); -} - static inline bool reset_in_progress(const struct intel_engine_execlists *execlists) { @@ -994,6 +904,7 @@ static void process_csb(struct intel_engine_cs *engine) struct intel_engine_execlists * const execlists = &engine->execlists; struct execlist_port *port = execlists->port; const u32 * const buf = execlists->csb_status; + const u8 num_entries = execlists->csb_size; u8 head, tail; lockdep_assert_held(&engine->timeline.lock); @@ -1029,7 +940,7 @@ static void process_csb(struct intel_engine_cs *engine) unsigned int status; unsigned int count; - if (++head == GEN8_CSB_ENTRIES) + if (++head == num_entries) head = 0; /* @@ -1151,7 +1062,7 @@ static void process_csb(struct intel_engine_cs *engine) * the wash as hardware, working or not, will need to do the * invalidation before. */ - invalidate_csb_entries(&buf[0], &buf[GEN8_CSB_ENTRIES - 1]); + invalidate_csb_entries(&buf[0], &buf[num_entries - 1]); } static void __execlists_submission_tasklet(struct intel_engine_cs *const engine) @@ -1379,9 +1290,33 @@ static int execlists_context_pin(struct intel_context *ce) return __execlists_context_pin(ce, ce->engine); } +static void execlists_context_reset(struct intel_context *ce) +{ + /* + * Because we emit WA_TAIL_DWORDS there may be a disparity + * between our bookkeeping in ce->ring->head and ce->ring->tail and + * that stored in context. As we only write new commands from + * ce->ring->tail onwards, everything before that is junk. If the GPU + * starts reading from its RING_HEAD from the context, it may try to + * execute that junk and die. + * + * The contexts that are stilled pinned on resume belong to the + * kernel, and are local to each engine. All other contexts will + * have their head/tail sanitized upon pinning before use, so they + * will never see garbage, + * + * So to avoid that we reset the context images upon resume. For + * simplicity, we just zero everything out. + */ + intel_ring_reset(ce->ring, 0); + __execlists_update_reg_state(ce, ce->engine); +} + static const struct intel_context_ops execlists_context_ops = { .pin = execlists_context_pin, .unpin = execlists_context_unpin, + + .reset = execlists_context_reset, .destroy = execlists_context_destroy, }; @@ -1451,10 +1386,11 @@ static int emit_pdps(struct i915_request *rq) *cs++ = MI_LOAD_REGISTER_IMM(2 * GEN8_3LVL_PDPES) | MI_LRI_FORCE_POSTED; for (i = GEN8_3LVL_PDPES; i--; ) { const dma_addr_t pd_daddr = i915_page_dir_dma_addr(ppgtt, i); + u32 base = engine->mmio_base; - *cs++ = i915_mmio_reg_offset(GEN8_RING_PDP_UDW(engine, i)); + *cs++ = i915_mmio_reg_offset(GEN8_RING_PDP_UDW(base, i)); *cs++ = upper_32_bits(pd_daddr); - *cs++ = i915_mmio_reg_offset(GEN8_RING_PDP_LDW(engine, i)); + *cs++ = i915_mmio_reg_offset(GEN8_RING_PDP_LDW(base, i)); *cs++ = lower_32_bits(pd_daddr); } *cs++ = MI_NOOP; @@ -1823,17 +1759,9 @@ static void enable_execlists(struct intel_engine_cs *engine) intel_engine_set_hwsp_writemask(engine, ~0u); /* HWSTAM */ - /* - * Make sure we're not enabling the new 12-deep CSB - * FIFO as that requires a slightly updated handling - * in the ctx switch irq. Since we're currently only - * using only 2 elements of the enhanced execlists the - * deeper FIFO it's not needed and it's not worth adding - * more statements to the irq handler to support it. - */ if (INTEL_GEN(dev_priv) >= 11) I915_WRITE(RING_MODE_GEN7(engine), - _MASKED_BIT_DISABLE(GEN11_GFX_DISABLE_LEGACY_MODE)); + _MASKED_BIT_ENABLE(GEN11_GFX_DISABLE_LEGACY_MODE)); else I915_WRITE(RING_MODE_GEN7(engine), _MASKED_BIT_ENABLE(GFX_RUN_LIST_ENABLE)); @@ -1903,7 +1831,6 @@ static void execlists_reset_prepare(struct intel_engine_cs *engine) /* And flush any current direct submission. */ spin_lock_irqsave(&engine->timeline.lock, flags); - process_csb(engine); /* drain preemption events */ spin_unlock_irqrestore(&engine->timeline.lock, flags); } @@ -1924,14 +1851,48 @@ static bool lrc_regs_ok(const struct i915_request *rq) return true; } -static void execlists_reset(struct intel_engine_cs *engine, bool stalled) +static void reset_csb_pointers(struct intel_engine_execlists *execlists) +{ + const unsigned int reset_value = execlists->csb_size - 1; + + /* + * After a reset, the HW starts writing into CSB entry [0]. We + * therefore have to set our HEAD pointer back one entry so that + * the *first* entry we check is entry 0. To complicate this further, + * as we don't wait for the first interrupt after reset, we have to + * fake the HW write to point back to the last entry so that our + * inline comparison of our cached head position against the last HW + * write works even before the first interrupt. + */ + execlists->csb_head = reset_value; + WRITE_ONCE(*execlists->csb_write, reset_value); + wmb(); /* Make sure this is visible to HW (paranoia?) */ + + invalidate_csb_entries(&execlists->csb_status[0], + &execlists->csb_status[reset_value]); +} + +static void __execlists_reset(struct intel_engine_cs *engine, bool stalled) { struct intel_engine_execlists * const execlists = &engine->execlists; + struct intel_context *ce; struct i915_request *rq; - unsigned long flags; u32 *regs; - spin_lock_irqsave(&engine->timeline.lock, flags); + process_csb(engine); /* drain preemption events */ + + /* Following the reset, we need to reload the CSB read/write pointers */ + reset_csb_pointers(&engine->execlists); + + /* + * Save the currently executing context, even if we completed + * its request, it was still running at the time of the + * reset and will have been clobbered. + */ + if (!port_isset(execlists->port)) + goto out_clear; + + ce = port_request(execlists->port)->hw_context; /* * Catch up with any missed context-switch interrupts. @@ -1946,12 +1907,13 @@ static void execlists_reset(struct intel_engine_cs *engine, bool stalled) /* Push back any incomplete requests for replay after the reset. */ rq = __unwind_incomplete_requests(engine); - - /* Following the reset, we need to reload the CSB read/write pointers */ - reset_csb_pointers(&engine->execlists); - if (!rq) - goto out_unlock; + goto out_replay; + + if (rq->hw_context != ce) { /* caught just before a CS event */ + rq = NULL; + goto out_replay; + } /* * If this request hasn't started yet, e.g. it is waiting on a @@ -1966,7 +1928,7 @@ static void execlists_reset(struct intel_engine_cs *engine, bool stalled) * perfectly and we do not need to flag the result as being erroneous. */ if (!i915_request_started(rq) && lrc_regs_ok(rq)) - goto out_unlock; + goto out_replay; /* * If the request was innocent, we leave the request in the ELSP @@ -1981,7 +1943,7 @@ static void execlists_reset(struct intel_engine_cs *engine, bool stalled) */ i915_reset_request(rq, stalled); if (!stalled && lrc_regs_ok(rq)) - goto out_unlock; + goto out_replay; /* * We want a simple context + ring to execute the breadcrumb update. @@ -1991,21 +1953,103 @@ static void execlists_reset(struct intel_engine_cs *engine, bool stalled) * future request will be after userspace has had the opportunity * to recreate its own state. */ - regs = rq->hw_context->lrc_reg_state; + regs = ce->lrc_reg_state; if (engine->pinned_default_state) { memcpy(regs, /* skip restoring the vanilla PPHWSP */ engine->pinned_default_state + LRC_STATE_PN * PAGE_SIZE, engine->context_size - PAGE_SIZE); } + execlists_init_reg_state(regs, ce, engine, ce->ring); /* Rerun the request; its payload has been neutered (if guilty). */ - rq->ring->head = intel_ring_wrap(rq->ring, rq->head); - intel_ring_update_space(rq->ring); +out_replay: + ce->ring->head = + rq ? intel_ring_wrap(ce->ring, rq->head) : ce->ring->tail; + intel_ring_update_space(ce->ring); + __execlists_update_reg_state(ce, engine); - execlists_init_reg_state(regs, rq->hw_context, engine, rq->ring); - __execlists_update_reg_state(rq->hw_context, engine); +out_clear: + execlists_clear_all_active(execlists); +} + +static void execlists_reset(struct intel_engine_cs *engine, bool stalled) +{ + unsigned long flags; + + GEM_TRACE("%s\n", engine->name); + + spin_lock_irqsave(&engine->timeline.lock, flags); + + __execlists_reset(engine, stalled); + + spin_unlock_irqrestore(&engine->timeline.lock, flags); +} + +static void nop_submission_tasklet(unsigned long data) +{ + /* The driver is wedged; don't process any more events. */ +} + +static void execlists_cancel_requests(struct intel_engine_cs *engine) +{ + struct intel_engine_execlists * const execlists = &engine->execlists; + struct i915_request *rq, *rn; + struct rb_node *rb; + unsigned long flags; + + GEM_TRACE("%s\n", engine->name); + + /* + * Before we call engine->cancel_requests(), we should have exclusive + * access to the submission state. This is arranged for us by the + * caller disabling the interrupt generation, the tasklet and other + * threads that may then access the same state, giving us a free hand + * to reset state. However, we still need to let lockdep be aware that + * we know this state may be accessed in hardirq context, so we + * disable the irq around this manipulation and we want to keep + * the spinlock focused on its duties and not accidentally conflate + * coverage to the submission's irq state. (Similarly, although we + * shouldn't need to disable irq around the manipulation of the + * submission's irq state, we also wish to remind ourselves that + * it is irq state.) + */ + spin_lock_irqsave(&engine->timeline.lock, flags); + + __execlists_reset(engine, true); + + /* Mark all executing requests as skipped. */ + list_for_each_entry(rq, &engine->timeline.requests, link) { + if (!i915_request_signaled(rq)) + dma_fence_set_error(&rq->fence, -EIO); + + i915_request_mark_complete(rq); + } + + /* Flush the queued requests to the timeline list (for retiring). */ + while ((rb = rb_first_cached(&execlists->queue))) { + struct i915_priolist *p = to_priolist(rb); + int i; + + priolist_for_each_request_consume(rq, rn, p, i) { + list_del_init(&rq->sched.link); + __i915_request_submit(rq); + dma_fence_set_error(&rq->fence, -EIO); + i915_request_mark_complete(rq); + } + + rb_erase_cached(&p->node, &execlists->queue); + i915_priolist_free(p); + } + + /* Remaining _unready_ requests will be nop'ed when submitted */ + + execlists->queue_priority_hint = INT_MIN; + execlists->queue = RB_ROOT_CACHED; + GEM_BUG_ON(port_isset(execlists->port)); + + GEM_BUG_ON(__tasklet_is_enabled(&execlists->tasklet)); + execlists->tasklet.func = nop_submission_tasklet; -out_unlock: spin_unlock_irqrestore(&engine->timeline.lock, flags); } @@ -2035,7 +2079,7 @@ static int gen8_emit_bb_start(struct i915_request *rq, { u32 *cs; - cs = intel_ring_begin(rq, 6); + cs = intel_ring_begin(rq, 4); if (IS_ERR(cs)) return PTR_ERR(cs); @@ -2046,19 +2090,37 @@ static int gen8_emit_bb_start(struct i915_request *rq, * particular all the gen that do not need the w/a at all!), if we * took care to make sure that on every switch into this context * (both ordinary and for preemption) that arbitrartion was enabled - * we would be fine. However, there doesn't seem to be a downside to - * being paranoid and making sure it is set before each batch and - * every context-switch. - * - * Note that if we fail to enable arbitration before the request - * is complete, then we do not see the context-switch interrupt and - * the engine hangs (with RING_HEAD == RING_TAIL). - * - * That satisfies both the GPGPU w/a and our heavy-handed paranoia. + * we would be fine. However, for gen8 there is another w/a that + * requires us to not preempt inside GPGPU execution, so we keep + * arbitration disabled for gen8 batches. Arbitration will be + * re-enabled before we close the request + * (engine->emit_fini_breadcrumb). */ + *cs++ = MI_ARB_ON_OFF | MI_ARB_DISABLE; + + /* FIXME(BDW+): Address space and security selectors. */ + *cs++ = MI_BATCH_BUFFER_START_GEN8 | + (flags & I915_DISPATCH_SECURE ? 0 : BIT(8)); + *cs++ = lower_32_bits(offset); + *cs++ = upper_32_bits(offset); + + intel_ring_advance(rq, cs); + + return 0; +} + +static int gen9_emit_bb_start(struct i915_request *rq, + u64 offset, u32 len, + const unsigned int flags) +{ + u32 *cs; + + cs = intel_ring_begin(rq, 6); + if (IS_ERR(cs)) + return PTR_ERR(cs); + *cs++ = MI_ARB_ON_OFF | MI_ARB_ENABLE; - /* FIXME(BDW): Address space and security selectors. */ *cs++ = MI_BATCH_BUFFER_START_GEN8 | (flags & I915_DISPATCH_SECURE ? 0 : BIT(8)); *cs++ = lower_32_bits(offset); @@ -2309,6 +2371,8 @@ void intel_execlists_set_default_submission(struct intel_engine_cs *engine) engine->execlists.tasklet.func = execlists_submission_tasklet; engine->reset.prepare = execlists_reset_prepare; + engine->reset.reset = execlists_reset; + engine->reset.finish = execlists_reset_finish; engine->park = NULL; engine->unpark = NULL; @@ -2316,7 +2380,8 @@ void intel_execlists_set_default_submission(struct intel_engine_cs *engine) engine->flags |= I915_ENGINE_SUPPORTS_STATS; if (!intel_vgpu_active(engine->i915)) engine->flags |= I915_ENGINE_HAS_SEMAPHORES; - if (engine->preempt_context) + if (engine->preempt_context && + HAS_LOGICAL_RING_PREEMPTION(engine->i915)) engine->flags |= I915_ENGINE_HAS_PREEMPTION; } @@ -2350,7 +2415,10 @@ logical_ring_default_vfuncs(struct intel_engine_cs *engine) * until a more refined solution exists. */ } - engine->emit_bb_start = gen8_emit_bb_start; + if (IS_GEN(engine->i915, 8)) + engine->emit_bb_start = gen8_emit_bb_start; + else + engine->emit_bb_start = gen9_emit_bb_start; } static inline void @@ -2429,6 +2497,11 @@ static int logical_ring_init(struct intel_engine_cs *engine) execlists->csb_write = &engine->status_page.addr[intel_hws_csb_write_index(i915)]; + if (INTEL_GEN(engine->i915) < 11) + execlists->csb_size = GEN8_CSB_ENTRIES; + else + execlists->csb_size = GEN11_CSB_ENTRIES; + reset_csb_pointers(execlists); return 0; @@ -2707,14 +2780,14 @@ static void execlists_init_reg_state(u32 *regs, CTX_REG(regs, CTX_CTX_TIMESTAMP, RING_CTX_TIMESTAMP(base), 0); /* PDP values well be assigned later if needed */ - CTX_REG(regs, CTX_PDP3_UDW, GEN8_RING_PDP_UDW(engine, 3), 0); - CTX_REG(regs, CTX_PDP3_LDW, GEN8_RING_PDP_LDW(engine, 3), 0); - CTX_REG(regs, CTX_PDP2_UDW, GEN8_RING_PDP_UDW(engine, 2), 0); - CTX_REG(regs, CTX_PDP2_LDW, GEN8_RING_PDP_LDW(engine, 2), 0); - CTX_REG(regs, CTX_PDP1_UDW, GEN8_RING_PDP_UDW(engine, 1), 0); - CTX_REG(regs, CTX_PDP1_LDW, GEN8_RING_PDP_LDW(engine, 1), 0); - CTX_REG(regs, CTX_PDP0_UDW, GEN8_RING_PDP_UDW(engine, 0), 0); - CTX_REG(regs, CTX_PDP0_LDW, GEN8_RING_PDP_LDW(engine, 0), 0); + CTX_REG(regs, CTX_PDP3_UDW, GEN8_RING_PDP_UDW(base, 3), 0); + CTX_REG(regs, CTX_PDP3_LDW, GEN8_RING_PDP_LDW(base, 3), 0); + CTX_REG(regs, CTX_PDP2_UDW, GEN8_RING_PDP_UDW(base, 2), 0); + CTX_REG(regs, CTX_PDP2_LDW, GEN8_RING_PDP_LDW(base, 2), 0); + CTX_REG(regs, CTX_PDP1_UDW, GEN8_RING_PDP_UDW(base, 1), 0); + CTX_REG(regs, CTX_PDP1_LDW, GEN8_RING_PDP_LDW(base, 1), 0); + CTX_REG(regs, CTX_PDP0_UDW, GEN8_RING_PDP_UDW(base, 0), 0); + CTX_REG(regs, CTX_PDP0_LDW, GEN8_RING_PDP_LDW(base, 0), 0); if (i915_vm_is_4lvl(&ppgtt->vm)) { /* 64b PPGTT (48bit canonical) @@ -2872,31 +2945,6 @@ error_deref_obj: return ret; } -void intel_lr_context_resume(struct drm_i915_private *i915) -{ - struct i915_gem_context *ctx; - struct intel_context *ce; - - /* - * Because we emit WA_TAIL_DWORDS there may be a disparity - * between our bookkeeping in ce->ring->head and ce->ring->tail and - * that stored in context. As we only write new commands from - * ce->ring->tail onwards, everything before that is junk. If the GPU - * starts reading from its RING_HEAD from the context, it may try to - * execute that junk and die. - * - * So to avoid that we reset the context images upon resume. For - * simplicity, we just zero everything out. - */ - list_for_each_entry(ctx, &i915->contexts.list, link) { - list_for_each_entry(ce, &ctx->active_engines, active_link) { - GEM_BUG_ON(!ce->ring); - intel_ring_reset(ce->ring, 0); - __execlists_update_reg_state(ce, ce->engine); - } - } -} - void intel_execlists_show_requests(struct intel_engine_cs *engine, struct drm_printer *m, void (*show_request)(struct drm_printer *m, @@ -2957,6 +3005,37 @@ void intel_execlists_show_requests(struct intel_engine_cs *engine, spin_unlock_irqrestore(&engine->timeline.lock, flags); } +void intel_lr_context_reset(struct intel_engine_cs *engine, + struct intel_context *ce, + u32 head, + bool scrub) +{ + /* + * We want a simple context + ring to execute the breadcrumb update. + * We cannot rely on the context being intact across the GPU hang, + * so clear it and rebuild just what we need for the breadcrumb. + * All pending requests for this context will be zapped, and any + * future request will be after userspace has had the opportunity + * to recreate its own state. + */ + if (scrub) { + u32 *regs = ce->lrc_reg_state; + + if (engine->pinned_default_state) { + memcpy(regs, /* skip restoring the vanilla PPHWSP */ + engine->pinned_default_state + LRC_STATE_PN * PAGE_SIZE, + engine->context_size - PAGE_SIZE); + } + execlists_init_reg_state(regs, ce, engine, ce->ring); + } + + /* Rerun the request; its payload has been neutered (if guilty). */ + ce->ring->head = head; + intel_ring_update_space(ce->ring); + + __execlists_update_reg_state(ce, engine); +} + #if IS_ENABLED(CONFIG_DRM_I915_SELFTEST) #include "selftests/intel_lrc.c" #endif |