diff options
| -rw-r--r-- | drivers/gpu/drm/i915/intel_lrc.c | 241 |
1 files changed, 133 insertions, 108 deletions
diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c index 95ec4f7ad083..3cb788a223ef 100644 --- a/drivers/gpu/drm/i915/intel_lrc.c +++ b/drivers/gpu/drm/i915/intel_lrc.c @@ -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 = 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); - - 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) { @@ -1152,7 +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) @@ -1921,7 +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); } @@ -1942,14 +1851,47 @@ 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); + + 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. @@ -1964,12 +1906,13 @@ 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 @@ -1984,7 +1927,7 @@ 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 @@ -1999,7 +1942,7 @@ 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. @@ -2009,21 +1952,103 @@ 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); + +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; - execlists_init_reg_state(regs, rq->hw_context, engine, rq->ring); - __execlists_update_reg_state(rq->hw_context, engine); + 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); } |