Commit 292ad25c authored by Chris Wilson's avatar Chris Wilson

drm/i915/guc: Implement reset locally

Before causing guc and execlists to diverge further (breaking guc in the
process), take a copy of the current reset procedure and make it local to
the guc submission backend
Signed-off-by: default avatarChris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: default avatarMika Kuoppala <mika.kuoppala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190411130515.20716-1-chris@chris-wilson.co.uk
parent 3936867d
......@@ -872,6 +872,104 @@ static void guc_reset_prepare(struct intel_engine_cs *engine)
flush_workqueue(engine->i915->guc.preempt_wq);
}
static void guc_reset(struct intel_engine_cs *engine, bool stalled)
{
struct intel_engine_execlists * const execlists = &engine->execlists;
struct i915_request *rq;
unsigned long flags;
spin_lock_irqsave(&engine->timeline.lock, flags);
execlists_cancel_port_requests(execlists);
/* Push back any incomplete requests for replay after the reset. */
rq = execlists_unwind_incomplete_requests(execlists);
if (!rq)
goto out_unlock;
if (!i915_request_started(rq))
stalled = false;
i915_reset_request(rq, stalled);
intel_lr_context_reset(engine, rq->hw_context, rq->head, stalled);
out_unlock:
spin_unlock_irqrestore(&engine->timeline.lock, flags);
}
static void guc_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);
/* 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));
spin_unlock_irqrestore(&engine->timeline.lock, flags);
}
static void guc_reset_finish(struct intel_engine_cs *engine)
{
struct intel_engine_execlists * const execlists = &engine->execlists;
if (__tasklet_enable(&execlists->tasklet))
/* And kick in case we missed a new request submission. */
tasklet_hi_schedule(&execlists->tasklet);
GEM_TRACE("%s: depth->%d\n", engine->name,
atomic_read(&execlists->tasklet.count));
}
/*
* Everything below here is concerned with setup & teardown, and is
* therefore not part of the somewhat time-critical batch-submission
......@@ -1293,6 +1391,10 @@ static void guc_set_default_submission(struct intel_engine_cs *engine)
engine->unpark = guc_submission_unpark;
engine->reset.prepare = guc_reset_prepare;
engine->reset.reset = guc_reset;
engine->reset.finish = guc_reset_finish;
engine->cancel_requests = guc_cancel_requests;
engine->flags &= ~I915_ENGINE_SUPPORTS_STATS;
}
......
......@@ -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
......@@ -2345,6 +2345,8 @@ 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;
......@@ -2977,6 +2979,37 @@ 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
......@@ -103,6 +103,11 @@ struct i915_gem_context;
void intel_execlists_set_default_submission(struct intel_engine_cs *engine);
void intel_lr_context_reset(struct intel_engine_cs *engine,
struct intel_context *ce,
u32 head,
bool scrub);
void intel_execlists_show_requests(struct intel_engine_cs *engine,
struct drm_printer *m,
void (*show_request)(struct drm_printer *m,
......
......@@ -165,7 +165,7 @@ void execlists_user_end(struct intel_engine_execlists *execlists);
void
execlists_cancel_port_requests(struct intel_engine_execlists * const execlists);
void
struct i915_request *
execlists_unwind_incomplete_requests(struct intel_engine_execlists *execlists);
static inline unsigned int
......
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