Open source GPL/LGPL release

drivers/gpu/nvgpu/common/fifo/channel_worker.c

@@ -0,0 +1,118 @@
+/*
+ * Copyright (c) 2017-2020, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * 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 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 "channel_worker.h"
+#include "channel_wdt.h"
+
+#include <nvgpu/worker.h>
+#include <nvgpu/channel.h>
+
+static inline struct nvgpu_channel *
+nvgpu_channel_from_worker_item(struct nvgpu_list_node *node)
+{
+	return (struct nvgpu_channel *)
+	   ((uintptr_t)node - offsetof(struct nvgpu_channel, worker_item));
+};
+
+static void nvgpu_channel_worker_poll_wakeup_process_item(
+		struct nvgpu_list_node *work_item)
+{
+	struct nvgpu_channel *ch = nvgpu_channel_from_worker_item(work_item);
+
+	nvgpu_assert(ch != NULL);
+
+	nvgpu_log_fn(ch->g, " ");
+
+	nvgpu_channel_clean_up_jobs(ch);
+
+	/* ref taken when enqueued */
+	nvgpu_channel_put(ch);
+}
+
+static const struct nvgpu_worker_ops channel_worker_ops = {
+#ifdef CONFIG_NVGPU_CHANNEL_WDT
+	.pre_process = nvgpu_channel_worker_poll_init,
+	.wakeup_post_process =
+		nvgpu_channel_worker_poll_wakeup_post_process_item,
+	.wakeup_timeout =
+		nvgpu_channel_worker_poll_wakeup_condition_get_timeout,
+#endif
+	.wakeup_early_exit = NULL,
+	.wakeup_process_item =
+		nvgpu_channel_worker_poll_wakeup_process_item,
+	.wakeup_condition = NULL,
+};
+
+/**
+ * Initialize the channel worker's metadata and start the background thread.
+ */
+int nvgpu_channel_worker_init(struct gk20a *g)
+{
+	struct nvgpu_worker *worker = &g->channel_worker.worker;
+
+	nvgpu_worker_init_name(worker, "nvgpu_channel_poll", g->name);
+
+	return nvgpu_worker_init(g, worker, &channel_worker_ops);
+}
+
+void nvgpu_channel_worker_deinit(struct gk20a *g)
+{
+	struct nvgpu_worker *worker = &g->channel_worker.worker;
+
+	nvgpu_worker_deinit(worker);
+}
+
+/**
+ * Append a channel to the worker's list, if not there already.
+ *
+ * The worker thread processes work items (channels in its work list) and polls
+ * for other things. This adds @ch to the end of the list and wakes the worker
+ * up immediately. If the channel already existed in the list, it's not added,
+ * because in that case it has been scheduled already but has not yet been
+ * processed.
+ */
+void nvgpu_channel_worker_enqueue(struct nvgpu_channel *ch)
+{
+	struct gk20a *g = ch->g;
+	int ret;
+
+	nvgpu_log_fn(g, " ");
+
+	/*
+	 * Ref released when this item gets processed. The caller should hold
+	 * one ref already, so normally shouldn't fail, but the channel could
+	 * end up being freed between the time the caller got its reference and
+	 * the time we end up here (e.g., if the client got killed); if so, just
+	 * return.
+	 */
+	if (nvgpu_channel_get(ch) == NULL) {
+		nvgpu_info(g, "cannot get ch ref for worker!");
+		return;
+	}
+
+	ret = nvgpu_worker_enqueue(&g->channel_worker.worker,
+			&ch->worker_item);
+	if (ret != 0) {
+		nvgpu_channel_put(ch);
+		return;
+	}
+}