Open source GPL/LGPL release

drivers/gpu/nvgpu/common/sync/channel_user_syncpt.c

@@ -0,0 +1,144 @@
+/*
+ * Copyright (c) 2020-2021, 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 <nvgpu/kmem.h>
+#include <nvgpu/log.h>
+#include <nvgpu/nvhost.h>
+#include <nvgpu/gk20a.h>
+#include <nvgpu/channel.h>
+#include <nvgpu/channel_user_syncpt.h>
+#include <nvgpu/string.h>
+#include <nvgpu/errata.h>
+#include "channel_user_syncpt_priv.h"
+
+static int user_sync_build_debug_name(struct nvgpu_channel *ch,
+		char *buf, size_t capacity)
+{
+	struct gk20a *g = ch->g;
+	int n;
+
+	(void)strncpy(buf, g->name, capacity);
+	capacity = nvgpu_safe_sub_u64(capacity, strlen(g->name));
+
+	(void)strncat(buf, "_", capacity);
+	capacity = nvgpu_safe_sub_u64(capacity, strlen("_"));
+	/*
+	 * however, nvgpu_strnadd_u32 expects capacity to include the
+	 * terminating byte, so add it back
+	 */
+	capacity = nvgpu_safe_add_u64(capacity, 1);
+
+	n = nvgpu_strnadd_u32(&buf[strlen(buf)], ch->chid,
+				capacity, 10);
+	if (n == 0) {
+		nvgpu_err(g, "strnadd failed!");
+		return -EINVAL;
+	}
+	capacity = nvgpu_safe_sub_u64(capacity, nvgpu_safe_cast_s32_to_u64(n));
+	/* nul byte */
+	capacity = nvgpu_safe_sub_u64(capacity, 1UL);
+
+	(void)strncat(buf, "_user", capacity);
+	/* make sure it didn't get truncated */
+	capacity = nvgpu_safe_sub_u64(capacity, strlen("_user"));
+
+	return 0;
+}
+
+struct nvgpu_channel_user_syncpt *
+nvgpu_channel_user_syncpt_create(struct nvgpu_channel *ch)
+{
+	struct gk20a *g = ch->g;
+	struct nvgpu_channel_user_syncpt *s;
+	char syncpt_name[SYNCPT_NAME_SZ] = {0}; /* e.g. gp10b_42_user */
+	int err;
+
+	s = nvgpu_kzalloc(ch->g, sizeof(*s));
+	if (s == NULL) {
+		return NULL;
+	}
+
+	s->ch = ch;
+	s->nvhost = g->nvhost;
+
+	err = user_sync_build_debug_name(ch, syncpt_name,
+			SYNCPT_NAME_SZ - 1UL);
+	if (err < 0) {
+		goto err_free;
+	}
+
+	s->syncpt_id = nvgpu_nvhost_get_syncpt_client_managed(s->nvhost,
+					syncpt_name);
+
+	/**
+	 * This is a fix to handle invalid value of a syncpt.
+	 * Once nvhost update the return value as NVGPU_INVALID_SYNCPT_ID,
+	 * we can remove the zero check.
+	 */
+	if ((nvgpu_is_errata_present(g, NVGPU_ERRATA_SYNCPT_INVALID_ID_0)) &&
+		(s->syncpt_id == 0U)) {
+		nvgpu_err(g, "failed to get free syncpt");
+		goto err_free;
+	}
+	if (s->syncpt_id == NVGPU_INVALID_SYNCPT_ID) {
+		nvgpu_err(g, "failed to get free syncpt");
+		goto err_free;
+	}
+
+	err = g->ops.sync.syncpt.alloc_buf(ch, s->syncpt_id, &s->syncpt_buf);
+	if (err != 0) {
+		nvgpu_err(g, "failed to allocate syncpoint buffer");
+		goto err_put;
+	}
+
+	return s;
+err_put:
+	nvgpu_nvhost_syncpt_put_ref_ext(s->nvhost, s->syncpt_id);
+err_free:
+	nvgpu_kfree(g, s);
+	return NULL;
+}
+
+u32 nvgpu_channel_user_syncpt_get_id(struct nvgpu_channel_user_syncpt *s)
+{
+	return s->syncpt_id;
+}
+
+u64 nvgpu_channel_user_syncpt_get_address(struct nvgpu_channel_user_syncpt *s)
+{
+	return s->syncpt_buf.gpu_va;
+}
+
+void nvgpu_channel_user_syncpt_set_safe_state(struct nvgpu_channel_user_syncpt *s)
+{
+	nvgpu_nvhost_syncpt_set_safe_state(s->nvhost, s->syncpt_id);
+}
+
+void nvgpu_channel_user_syncpt_destroy(struct nvgpu_channel_user_syncpt *s)
+{
+	struct gk20a *g = s->ch->g;
+
+	g->ops.sync.syncpt.free_buf(s->ch, &s->syncpt_buf);
+
+	nvgpu_nvhost_syncpt_put_ref_ext(s->nvhost, s->syncpt_id);
+	nvgpu_kfree(g, s);
+}