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Diffstat (limited to 'drivers/gpu/drm/i915/gt/mock_engine.c')
-rw-r--r--drivers/gpu/drm/i915/gt/mock_engine.c344
1 files changed, 344 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/gt/mock_engine.c b/drivers/gpu/drm/i915/gt/mock_engine.c
new file mode 100644
index 000000000000..2941916b37bf
--- /dev/null
+++ b/drivers/gpu/drm/i915/gt/mock_engine.c
@@ -0,0 +1,344 @@
+/*
+ * Copyright © 2016 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ *
+ */
+
+#include "i915_drv.h"
+#include "i915_gem_context.h"
+#include "intel_context.h"
+#include "intel_engine_pm.h"
+
+#include "mock_engine.h"
+#include "selftests/mock_request.h"
+
+struct mock_ring {
+ struct intel_ring base;
+ struct i915_timeline timeline;
+};
+
+static void mock_timeline_pin(struct i915_timeline *tl)
+{
+ tl->pin_count++;
+}
+
+static void mock_timeline_unpin(struct i915_timeline *tl)
+{
+ GEM_BUG_ON(!tl->pin_count);
+ tl->pin_count--;
+}
+
+static struct intel_ring *mock_ring(struct intel_engine_cs *engine)
+{
+ const unsigned long sz = PAGE_SIZE / 2;
+ struct mock_ring *ring;
+
+ ring = kzalloc(sizeof(*ring) + sz, GFP_KERNEL);
+ if (!ring)
+ return NULL;
+
+ if (i915_timeline_init(engine->i915, &ring->timeline, NULL)) {
+ kfree(ring);
+ return NULL;
+ }
+
+ kref_init(&ring->base.ref);
+ ring->base.size = sz;
+ ring->base.effective_size = sz;
+ ring->base.vaddr = (void *)(ring + 1);
+ ring->base.timeline = &ring->timeline;
+
+ INIT_LIST_HEAD(&ring->base.request_list);
+ intel_ring_update_space(&ring->base);
+
+ return &ring->base;
+}
+
+static void mock_ring_free(struct intel_ring *base)
+{
+ struct mock_ring *ring = container_of(base, typeof(*ring), base);
+
+ i915_timeline_fini(&ring->timeline);
+ 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_queue_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)
+{
+ mock_timeline_unpin(ce->ring->timeline);
+}
+
+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 (ce->ring)
+ mock_ring_free(ce->ring);
+
+ intel_context_free(ce);
+}
+
+static int mock_context_pin(struct intel_context *ce)
+{
+ if (!ce->ring) {
+ ce->ring = mock_ring(ce->engine);
+ if (!ce->ring)
+ return -ENOMEM;
+ }
+
+ mock_timeline_pin(ce->ring->timeline);
+ return 0;
+}
+
+static const struct intel_context_ops mock_context_ops = {
+ .pin = mock_context_pin,
+ .unpin = mock_context_unpin,
+
+ .enter = intel_context_enter_engine,
+ .exit = intel_context_exit_engine,
+
+ .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_reset_prepare(struct intel_engine_cs *engine)
+{
+}
+
+static void mock_reset(struct intel_engine_cs *engine, bool stalled)
+{
+ GEM_BUG_ON(stalled);
+}
+
+static void mock_reset_finish(struct intel_engine_cs *engine)
+{
+}
+
+static void mock_cancel_requests(struct intel_engine_cs *engine)
+{
+ struct i915_request *request;
+ unsigned long flags;
+
+ spin_lock_irqsave(&engine->timeline.lock, flags);
+
+ /* Mark all submitted requests as skipped. */
+ list_for_each_entry(request, &engine->timeline.requests, sched.link) {
+ if (!i915_request_signaled(request))
+ dma_fence_set_error(&request->fence, -EIO);
+
+ i915_request_mark_complete(request);
+ }
+
+ spin_unlock_irqrestore(&engine->timeline.lock, flags);
+}
+
+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);
+
+ engine = kzalloc(sizeof(*engine) + PAGE_SIZE, GFP_KERNEL);
+ if (!engine)
+ return NULL;
+
+ /* minimal engine setup for requests */
+ engine->base.i915 = i915;
+ snprintf(engine->base.name, sizeof(engine->base.name), "%s", name);
+ engine->base.id = id;
+ engine->base.mask = BIT(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.reset.prepare = mock_reset_prepare;
+ engine->base.reset.reset = mock_reset;
+ engine->base.reset.finish = mock_reset_finish;
+ engine->base.cancel_requests = mock_cancel_requests;
+
+ /* fake hw queue */
+ spin_lock_init(&engine->hw_lock);
+ timer_setup(&engine->hw_delay, hw_delay_complete, 0);
+ INIT_LIST_HEAD(&engine->hw_queue);
+
+ return &engine->base;
+}
+
+int mock_engine_init(struct intel_engine_cs *engine)
+{
+ struct drm_i915_private *i915 = engine->i915;
+ int err;
+
+ intel_engine_init_breadcrumbs(engine);
+ intel_engine_init_execlists(engine);
+ intel_engine_init__pm(engine);
+
+ if (i915_timeline_init(i915, &engine->timeline, NULL))
+ goto err_breadcrumbs;
+ i915_timeline_set_subclass(&engine->timeline, TIMELINE_ENGINE);
+
+ engine->kernel_context =
+ i915_gem_context_get_engine(i915->kernel_context, engine->id);
+ if (IS_ERR(engine->kernel_context))
+ goto err_timeline;
+
+ err = intel_context_pin(engine->kernel_context);
+ intel_context_put(engine->kernel_context);
+ if (err)
+ goto err_timeline;
+
+ return 0;
+
+err_timeline:
+ i915_timeline_fini(&engine->timeline);
+err_breadcrumbs:
+ intel_engine_fini_breadcrumbs(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)
+{
+}
+
+void mock_engine_free(struct intel_engine_cs *engine)
+{
+ struct mock_engine *mock =
+ container_of(engine, typeof(*mock), base);
+ struct intel_context *ce;
+
+ GEM_BUG_ON(timer_pending(&mock->hw_delay));
+
+ ce = fetch_and_zero(&engine->last_retired_context);
+ if (ce)
+ intel_context_unpin(ce);
+
+ intel_context_unpin(engine->kernel_context);
+
+ intel_engine_fini_breadcrumbs(engine);
+ i915_timeline_fini(&engine->timeline);
+
+ kfree(engine);
+}