linuxdebug/drivers/gpu/drm/i915/gt/mock_engine.c

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2024-07-16 15:50:57 +02:00
// SPDX-License-Identifier: MIT
/*
* Copyright © 2016 Intel Corporation
*/
#include "gem/i915_gem_context.h"
#include "gt/intel_ring.h"
#include "i915_drv.h"
#include "intel_context.h"
#include "intel_engine_pm.h"
#include "mock_engine.h"
#include "selftests/mock_request.h"
static int mock_timeline_pin(struct intel_timeline *tl)
{
int err;
if (WARN_ON(!i915_gem_object_trylock(tl->hwsp_ggtt->obj, NULL)))
return -EBUSY;
err = intel_timeline_pin_map(tl);
i915_gem_object_unlock(tl->hwsp_ggtt->obj);
if (err)
return err;
atomic_inc(&tl->pin_count);
return 0;
}
static void mock_timeline_unpin(struct intel_timeline *tl)
{
GEM_BUG_ON(!atomic_read(&tl->pin_count));
atomic_dec(&tl->pin_count);
}
static struct i915_vma *create_ring_vma(struct i915_ggtt *ggtt, int size)
{
struct i915_address_space *vm = &ggtt->vm;
struct drm_i915_private *i915 = vm->i915;
struct drm_i915_gem_object *obj;
struct i915_vma *vma;
obj = i915_gem_object_create_internal(i915, size);
if (IS_ERR(obj))
return ERR_CAST(obj);
vma = i915_vma_instance(obj, vm, NULL);
if (IS_ERR(vma))
goto err;
return vma;
err:
i915_gem_object_put(obj);
return vma;
}
static struct intel_ring *mock_ring(struct intel_engine_cs *engine)
{
const unsigned long sz = PAGE_SIZE;
struct intel_ring *ring;
ring = kzalloc(sizeof(*ring) + sz, GFP_KERNEL);
if (!ring)
return NULL;
kref_init(&ring->ref);
ring->size = sz;
ring->effective_size = sz;
ring->vaddr = (void *)(ring + 1);
atomic_set(&ring->pin_count, 1);
ring->vma = create_ring_vma(engine->gt->ggtt, PAGE_SIZE);
if (IS_ERR(ring->vma)) {
kfree(ring);
return NULL;
}
intel_ring_update_space(ring);
return ring;
}
static void mock_ring_free(struct intel_ring *ring)
{
i915_vma_put(ring->vma);
kfree(ring);
}
static struct i915_request *first_request(struct mock_engine *engine)
{
return list_first_entry_or_null(&engine->hw_queue,
struct i915_request,
mock.link);
}
static void advance(struct i915_request *request)
{
list_del_init(&request->mock.link);
i915_request_mark_complete(request);
GEM_BUG_ON(!i915_request_completed(request));
intel_engine_signal_breadcrumbs(request->engine);
}
static void hw_delay_complete(struct timer_list *t)
{
struct mock_engine *engine = from_timer(engine, t, hw_delay);
struct i915_request *request;
unsigned long flags;
spin_lock_irqsave(&engine->hw_lock, flags);
/* Timer fired, first request is complete */
request = first_request(engine);
if (request)
advance(request);
/*
* Also immediately signal any subsequent 0-delay requests, but
* requeue the timer for the next delayed request.
*/
while ((request = first_request(engine))) {
if (request->mock.delay) {
mod_timer(&engine->hw_delay,
jiffies + request->mock.delay);
break;
}
advance(request);
}
spin_unlock_irqrestore(&engine->hw_lock, flags);
}
static void mock_context_unpin(struct intel_context *ce)
{
}
static void mock_context_post_unpin(struct intel_context *ce)
{
i915_vma_unpin(ce->ring->vma);
}
static void mock_context_destroy(struct kref *ref)
{
struct intel_context *ce = container_of(ref, typeof(*ce), ref);
GEM_BUG_ON(intel_context_is_pinned(ce));
if (test_bit(CONTEXT_ALLOC_BIT, &ce->flags)) {
mock_ring_free(ce->ring);
mock_timeline_unpin(ce->timeline);
}
intel_context_fini(ce);
intel_context_free(ce);
}
static int mock_context_alloc(struct intel_context *ce)
{
int err;
ce->ring = mock_ring(ce->engine);
if (!ce->ring)
return -ENOMEM;
ce->timeline = intel_timeline_create(ce->engine->gt);
if (IS_ERR(ce->timeline)) {
kfree(ce->engine);
return PTR_ERR(ce->timeline);
}
err = mock_timeline_pin(ce->timeline);
if (err) {
intel_timeline_put(ce->timeline);
ce->timeline = NULL;
return err;
}
return 0;
}
static int mock_context_pre_pin(struct intel_context *ce,
struct i915_gem_ww_ctx *ww, void **unused)
{
return i915_vma_pin_ww(ce->ring->vma, ww, 0, 0, PIN_GLOBAL | PIN_HIGH);
}
static int mock_context_pin(struct intel_context *ce, void *unused)
{
return 0;
}
static void mock_context_reset(struct intel_context *ce)
{
}
static const struct intel_context_ops mock_context_ops = {
.alloc = mock_context_alloc,
.pre_pin = mock_context_pre_pin,
.pin = mock_context_pin,
.unpin = mock_context_unpin,
.post_unpin = mock_context_post_unpin,
.enter = intel_context_enter_engine,
.exit = intel_context_exit_engine,
.reset = mock_context_reset,
.destroy = mock_context_destroy,
};
static int mock_request_alloc(struct i915_request *request)
{
INIT_LIST_HEAD(&request->mock.link);
request->mock.delay = 0;
return 0;
}
static int mock_emit_flush(struct i915_request *request,
unsigned int flags)
{
return 0;
}
static u32 *mock_emit_breadcrumb(struct i915_request *request, u32 *cs)
{
return cs;
}
static void mock_submit_request(struct i915_request *request)
{
struct mock_engine *engine =
container_of(request->engine, typeof(*engine), base);
unsigned long flags;
i915_request_submit(request);
spin_lock_irqsave(&engine->hw_lock, flags);
list_add_tail(&request->mock.link, &engine->hw_queue);
if (list_is_first(&request->mock.link, &engine->hw_queue)) {
if (request->mock.delay)
mod_timer(&engine->hw_delay,
jiffies + request->mock.delay);
else
advance(request);
}
spin_unlock_irqrestore(&engine->hw_lock, flags);
}
static void mock_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 mock_remove_from_engine(struct i915_request *rq)
{
struct intel_engine_cs *engine, *locked;
/*
* Virtual engines complicate acquiring the engine timeline lock,
* as their rq->engine pointer is not stable until under that
* engine lock. The simple ploy we use is to take the lock then
* check that the rq still belongs to the newly locked engine.
*/
locked = READ_ONCE(rq->engine);
spin_lock_irq(&locked->sched_engine->lock);
while (unlikely(locked != (engine = READ_ONCE(rq->engine)))) {
spin_unlock(&locked->sched_engine->lock);
spin_lock(&engine->sched_engine->lock);
locked = engine;
}
list_del_init(&rq->sched.link);
spin_unlock_irq(&locked->sched_engine->lock);
}
static void mock_reset_prepare(struct intel_engine_cs *engine)
{
}
static void mock_reset_rewind(struct intel_engine_cs *engine, bool stalled)
{
GEM_BUG_ON(stalled);
}
static void mock_reset_cancel(struct intel_engine_cs *engine)
{
struct mock_engine *mock =
container_of(engine, typeof(*mock), base);
struct i915_request *rq;
unsigned long flags;
del_timer_sync(&mock->hw_delay);
spin_lock_irqsave(&engine->sched_engine->lock, flags);
/* Mark all submitted requests as skipped. */
list_for_each_entry(rq, &engine->sched_engine->requests, sched.link)
i915_request_put(i915_request_mark_eio(rq));
intel_engine_signal_breadcrumbs(engine);
/* Cancel and submit all pending requests. */
list_for_each_entry(rq, &mock->hw_queue, mock.link) {
if (i915_request_mark_eio(rq)) {
__i915_request_submit(rq);
i915_request_put(rq);
}
}
INIT_LIST_HEAD(&mock->hw_queue);
spin_unlock_irqrestore(&engine->sched_engine->lock, flags);
}
static void mock_reset_finish(struct intel_engine_cs *engine)
{
}
static void mock_engine_release(struct intel_engine_cs *engine)
{
struct mock_engine *mock =
container_of(engine, typeof(*mock), base);
GEM_BUG_ON(timer_pending(&mock->hw_delay));
i915_sched_engine_put(engine->sched_engine);
intel_breadcrumbs_put(engine->breadcrumbs);
intel_context_unpin(engine->kernel_context);
intel_context_put(engine->kernel_context);
intel_engine_fini_retire(engine);
}
struct intel_engine_cs *mock_engine(struct drm_i915_private *i915,
const char *name,
int id)
{
struct mock_engine *engine;
GEM_BUG_ON(id >= I915_NUM_ENGINES);
GEM_BUG_ON(!to_gt(i915)->uncore);
engine = kzalloc(sizeof(*engine) + PAGE_SIZE, GFP_KERNEL);
if (!engine)
return NULL;
/* minimal engine setup for requests */
engine->base.i915 = i915;
engine->base.gt = to_gt(i915);
engine->base.uncore = to_gt(i915)->uncore;
snprintf(engine->base.name, sizeof(engine->base.name), "%s", name);
engine->base.id = id;
engine->base.mask = BIT(id);
engine->base.legacy_idx = INVALID_ENGINE;
engine->base.instance = id;
engine->base.status_page.addr = (void *)(engine + 1);
engine->base.cops = &mock_context_ops;
engine->base.request_alloc = mock_request_alloc;
engine->base.emit_flush = mock_emit_flush;
engine->base.emit_fini_breadcrumb = mock_emit_breadcrumb;
engine->base.submit_request = mock_submit_request;
engine->base.add_active_request = mock_add_to_engine;
engine->base.remove_active_request = mock_remove_from_engine;
engine->base.reset.prepare = mock_reset_prepare;
engine->base.reset.rewind = mock_reset_rewind;
engine->base.reset.cancel = mock_reset_cancel;
engine->base.reset.finish = mock_reset_finish;
engine->base.release = mock_engine_release;
to_gt(i915)->engine[id] = &engine->base;
to_gt(i915)->engine_class[0][id] = &engine->base;
/* fake hw queue */
spin_lock_init(&engine->hw_lock);
timer_setup(&engine->hw_delay, hw_delay_complete, 0);
INIT_LIST_HEAD(&engine->hw_queue);
intel_engine_add_user(&engine->base);
return &engine->base;
}
int mock_engine_init(struct intel_engine_cs *engine)
{
struct intel_context *ce;
INIT_LIST_HEAD(&engine->pinned_contexts_list);
engine->sched_engine = i915_sched_engine_create(ENGINE_MOCK);
if (!engine->sched_engine)
return -ENOMEM;
engine->sched_engine->private_data = engine;
intel_engine_init_execlists(engine);
intel_engine_init__pm(engine);
intel_engine_init_retire(engine);
engine->breadcrumbs = intel_breadcrumbs_create(NULL);
if (!engine->breadcrumbs)
goto err_schedule;
ce = create_kernel_context(engine);
if (IS_ERR(ce))
goto err_breadcrumbs;
/* We insist the kernel context is using the status_page */
engine->status_page.vma = ce->timeline->hwsp_ggtt;
engine->kernel_context = ce;
return 0;
err_breadcrumbs:
intel_breadcrumbs_put(engine->breadcrumbs);
err_schedule:
i915_sched_engine_put(engine->sched_engine);
return -ENOMEM;
}
void mock_engine_flush(struct intel_engine_cs *engine)
{
struct mock_engine *mock =
container_of(engine, typeof(*mock), base);
struct i915_request *request, *rn;
del_timer_sync(&mock->hw_delay);
spin_lock_irq(&mock->hw_lock);
list_for_each_entry_safe(request, rn, &mock->hw_queue, mock.link)
advance(request);
spin_unlock_irq(&mock->hw_lock);
}
void mock_engine_reset(struct intel_engine_cs *engine)
{
}