452 lines
9.9 KiB
C
452 lines
9.9 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright © 2019 Intel Corporation
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*/
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#include "i915_selftest.h"
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#include "intel_engine_heartbeat.h"
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#include "intel_engine_pm.h"
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#include "intel_gt.h"
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#include "gem/selftests/mock_context.h"
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#include "selftests/igt_flush_test.h"
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#include "selftests/mock_drm.h"
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static int request_sync(struct i915_request *rq)
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{
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struct intel_timeline *tl = i915_request_timeline(rq);
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long timeout;
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int err = 0;
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intel_timeline_get(tl);
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i915_request_get(rq);
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/* Opencode i915_request_add() so we can keep the timeline locked. */
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__i915_request_commit(rq);
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rq->sched.attr.priority = I915_PRIORITY_BARRIER;
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__i915_request_queue_bh(rq);
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timeout = i915_request_wait(rq, 0, HZ / 10);
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if (timeout < 0)
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err = timeout;
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else
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i915_request_retire_upto(rq);
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lockdep_unpin_lock(&tl->mutex, rq->cookie);
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mutex_unlock(&tl->mutex);
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i915_request_put(rq);
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intel_timeline_put(tl);
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return err;
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}
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static int context_sync(struct intel_context *ce)
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{
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struct intel_timeline *tl = ce->timeline;
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int err = 0;
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mutex_lock(&tl->mutex);
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do {
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struct i915_request *rq;
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long timeout;
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if (list_empty(&tl->requests))
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break;
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rq = list_last_entry(&tl->requests, typeof(*rq), link);
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i915_request_get(rq);
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timeout = i915_request_wait(rq, 0, HZ / 10);
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if (timeout < 0)
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err = timeout;
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else
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i915_request_retire_upto(rq);
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i915_request_put(rq);
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} while (!err);
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mutex_unlock(&tl->mutex);
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/* Wait for all barriers to complete (remote CPU) before we check */
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i915_active_unlock_wait(&ce->active);
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return err;
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}
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static int __live_context_size(struct intel_engine_cs *engine)
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{
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struct intel_context *ce;
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struct i915_request *rq;
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void *vaddr;
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int err;
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ce = intel_context_create(engine);
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if (IS_ERR(ce))
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return PTR_ERR(ce);
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err = intel_context_pin(ce);
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if (err)
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goto err;
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vaddr = i915_gem_object_pin_map_unlocked(ce->state->obj,
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i915_coherent_map_type(engine->i915,
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ce->state->obj, false));
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if (IS_ERR(vaddr)) {
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err = PTR_ERR(vaddr);
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intel_context_unpin(ce);
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goto err;
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}
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/*
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* Note that execlists also applies a redzone which it checks on
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* context unpin when debugging. We are using the same location
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* and same poison value so that our checks overlap. Despite the
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* redundancy, we want to keep this little selftest so that we
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* get coverage of any and all submission backends, and we can
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* always extend this test to ensure we trick the HW into a
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* compromising position wrt to the various sections that need
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* to be written into the context state.
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*
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* TLDR; this overlaps with the execlists redzone.
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*/
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vaddr += engine->context_size - I915_GTT_PAGE_SIZE;
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memset(vaddr, POISON_INUSE, I915_GTT_PAGE_SIZE);
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rq = intel_context_create_request(ce);
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intel_context_unpin(ce);
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if (IS_ERR(rq)) {
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err = PTR_ERR(rq);
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goto err_unpin;
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}
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err = request_sync(rq);
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if (err)
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goto err_unpin;
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/* Force the context switch */
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rq = intel_engine_create_kernel_request(engine);
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if (IS_ERR(rq)) {
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err = PTR_ERR(rq);
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goto err_unpin;
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}
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err = request_sync(rq);
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if (err)
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goto err_unpin;
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if (memchr_inv(vaddr, POISON_INUSE, I915_GTT_PAGE_SIZE)) {
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pr_err("%s context overwrote trailing red-zone!", engine->name);
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err = -EINVAL;
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}
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err_unpin:
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i915_gem_object_unpin_map(ce->state->obj);
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err:
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intel_context_put(ce);
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return err;
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}
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static int live_context_size(void *arg)
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{
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struct intel_gt *gt = arg;
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struct intel_engine_cs *engine;
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enum intel_engine_id id;
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int err = 0;
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/*
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* Check that our context sizes are correct by seeing if the
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* HW tries to write past the end of one.
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*/
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for_each_engine(engine, gt, id) {
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struct file *saved;
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if (!engine->context_size)
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continue;
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intel_engine_pm_get(engine);
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/*
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* Hide the old default state -- we lie about the context size
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* and get confused when the default state is smaller than
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* expected. For our do nothing request, inheriting the
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* active state is sufficient, we are only checking that we
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* don't use more than we planned.
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*/
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saved = fetch_and_zero(&engine->default_state);
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/* Overlaps with the execlists redzone */
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engine->context_size += I915_GTT_PAGE_SIZE;
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err = __live_context_size(engine);
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engine->context_size -= I915_GTT_PAGE_SIZE;
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engine->default_state = saved;
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intel_engine_pm_put(engine);
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if (err)
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break;
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}
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return err;
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}
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static int __live_active_context(struct intel_engine_cs *engine)
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{
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unsigned long saved_heartbeat;
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struct intel_context *ce;
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int pass;
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int err;
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/*
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* We keep active contexts alive until after a subsequent context
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* switch as the final write from the context-save will be after
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* we retire the final request. We track when we unpin the context,
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* under the presumption that the final pin is from the last request,
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* and instead of immediately unpinning the context, we add a task
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* to unpin the context from the next idle-barrier.
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*
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* This test makes sure that the context is kept alive until a
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* subsequent idle-barrier (emitted when the engine wakeref hits 0
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* with no more outstanding requests).
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*
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* In GuC submission mode we don't use idle barriers and we instead
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* get a message from the GuC to signal that it is safe to unpin the
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* context from memory.
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*/
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if (intel_engine_uses_guc(engine))
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return 0;
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if (intel_engine_pm_is_awake(engine)) {
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pr_err("%s is awake before starting %s!\n",
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engine->name, __func__);
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return -EINVAL;
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}
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ce = intel_context_create(engine);
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if (IS_ERR(ce))
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return PTR_ERR(ce);
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saved_heartbeat = engine->props.heartbeat_interval_ms;
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engine->props.heartbeat_interval_ms = 0;
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for (pass = 0; pass <= 2; pass++) {
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struct i915_request *rq;
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intel_engine_pm_get(engine);
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rq = intel_context_create_request(ce);
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if (IS_ERR(rq)) {
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err = PTR_ERR(rq);
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goto out_engine;
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}
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err = request_sync(rq);
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if (err)
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goto out_engine;
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/* Context will be kept active until after an idle-barrier. */
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if (i915_active_is_idle(&ce->active)) {
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pr_err("context is not active; expected idle-barrier (%s pass %d)\n",
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engine->name, pass);
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err = -EINVAL;
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goto out_engine;
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}
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if (!intel_engine_pm_is_awake(engine)) {
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pr_err("%s is asleep before idle-barrier\n",
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engine->name);
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err = -EINVAL;
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goto out_engine;
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}
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out_engine:
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intel_engine_pm_put(engine);
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if (err)
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goto err;
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}
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/* Now make sure our idle-barriers are flushed */
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err = intel_engine_flush_barriers(engine);
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if (err)
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goto err;
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/* Wait for the barrier and in the process wait for engine to park */
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err = context_sync(engine->kernel_context);
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if (err)
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goto err;
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if (!i915_active_is_idle(&ce->active)) {
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pr_err("context is still active!");
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err = -EINVAL;
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}
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intel_engine_pm_flush(engine);
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if (intel_engine_pm_is_awake(engine)) {
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struct drm_printer p = drm_debug_printer(__func__);
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intel_engine_dump(engine, &p,
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"%s is still awake:%d after idle-barriers\n",
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engine->name,
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atomic_read(&engine->wakeref.count));
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GEM_TRACE_DUMP();
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err = -EINVAL;
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goto err;
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}
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err:
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engine->props.heartbeat_interval_ms = saved_heartbeat;
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intel_context_put(ce);
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return err;
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}
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static int live_active_context(void *arg)
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{
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struct intel_gt *gt = arg;
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struct intel_engine_cs *engine;
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enum intel_engine_id id;
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int err = 0;
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for_each_engine(engine, gt, id) {
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err = __live_active_context(engine);
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if (err)
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break;
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err = igt_flush_test(gt->i915);
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if (err)
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break;
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}
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return err;
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}
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static int __remote_sync(struct intel_context *ce, struct intel_context *remote)
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{
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struct i915_request *rq;
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int err;
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err = intel_context_pin(remote);
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if (err)
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return err;
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rq = intel_context_create_request(ce);
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if (IS_ERR(rq)) {
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err = PTR_ERR(rq);
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goto unpin;
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}
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err = intel_context_prepare_remote_request(remote, rq);
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if (err) {
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i915_request_add(rq);
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goto unpin;
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}
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err = request_sync(rq);
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unpin:
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intel_context_unpin(remote);
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return err;
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}
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static int __live_remote_context(struct intel_engine_cs *engine)
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{
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struct intel_context *local, *remote;
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unsigned long saved_heartbeat;
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int pass;
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int err;
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/*
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* Check that our idle barriers do not interfere with normal
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* activity tracking. In particular, check that operating
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* on the context image remotely (intel_context_prepare_remote_request),
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* which inserts foreign fences into intel_context.active, does not
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* clobber the idle-barrier.
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*
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* In GuC submission mode we don't use idle barriers.
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*/
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if (intel_engine_uses_guc(engine))
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return 0;
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if (intel_engine_pm_is_awake(engine)) {
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pr_err("%s is awake before starting %s!\n",
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engine->name, __func__);
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return -EINVAL;
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}
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remote = intel_context_create(engine);
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if (IS_ERR(remote))
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return PTR_ERR(remote);
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local = intel_context_create(engine);
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if (IS_ERR(local)) {
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err = PTR_ERR(local);
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goto err_remote;
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}
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saved_heartbeat = engine->props.heartbeat_interval_ms;
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engine->props.heartbeat_interval_ms = 0;
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intel_engine_pm_get(engine);
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for (pass = 0; pass <= 2; pass++) {
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err = __remote_sync(local, remote);
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if (err)
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break;
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err = __remote_sync(engine->kernel_context, remote);
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if (err)
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break;
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if (i915_active_is_idle(&remote->active)) {
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pr_err("remote context is not active; expected idle-barrier (%s pass %d)\n",
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engine->name, pass);
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err = -EINVAL;
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break;
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}
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}
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intel_engine_pm_put(engine);
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engine->props.heartbeat_interval_ms = saved_heartbeat;
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intel_context_put(local);
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err_remote:
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intel_context_put(remote);
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return err;
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}
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static int live_remote_context(void *arg)
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{
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struct intel_gt *gt = arg;
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struct intel_engine_cs *engine;
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enum intel_engine_id id;
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int err = 0;
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for_each_engine(engine, gt, id) {
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err = __live_remote_context(engine);
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if (err)
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break;
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err = igt_flush_test(gt->i915);
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if (err)
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break;
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}
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return err;
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}
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int intel_context_live_selftests(struct drm_i915_private *i915)
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{
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static const struct i915_subtest tests[] = {
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SUBTEST(live_context_size),
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SUBTEST(live_active_context),
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SUBTEST(live_remote_context),
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};
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struct intel_gt *gt = &i915->gt;
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if (intel_gt_is_wedged(gt))
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return 0;
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return intel_gt_live_subtests(tests, gt);
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}
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