1 files changed, 106 insertions, 0 deletions
diff --git a/drivers/gpu/drm/nouveau/nvkm/core/ramht.c b/drivers/gpu/drm/nouveau/nvkm/core/ramht.c
new file mode 100644
index 000000000000..ebd4d15479bd
--- /dev/null
+++ b/drivers/gpu/drm/nouveau/nvkm/core/ramht.c
@@ -0,0 +1,106 @@
+/*
+ * Copyright 2012 Red Hat Inc.
+ *
+ * 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 COPYRIGHT HOLDER(S) OR AUTHOR(S) 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 <core/ramht.h>
+#include <core/engine.h>
+
+#include <subdev/bar.h>
+
+static u32
+nvkm_ramht_hash(struct nvkm_ramht *ramht, int chid, u32 handle)
+{
+	u32 hash = 0;
+
+	while (handle) {
+		hash ^= (handle & ((1 << ramht->bits) - 1));
+		handle >>= ramht->bits;
+	}
+
+	hash ^= chid << (ramht->bits - 4);
+	hash  = hash << 3;
+	return hash;
+}
+
+int
+nvkm_ramht_insert(struct nvkm_ramht *ramht, int chid, u32 handle, u32 context)
+{
+	struct nvkm_bar *bar = nvkm_bar(ramht);
+	u32 co, ho;
+
+	co = ho = nvkm_ramht_hash(ramht, chid, handle);
+	do {
+		if (!nv_ro32(ramht, co + 4)) {
+			nv_wo32(ramht, co + 0, handle);
+			nv_wo32(ramht, co + 4, context);
+			if (bar)
+				bar->flush(bar);
+			return co;
+		}
+
+		co += 8;
+		if (co >= nv_gpuobj(ramht)->size)
+			co = 0;
+	} while (co != ho);
+
+	return -ENOMEM;
+}
+
+void
+nvkm_ramht_remove(struct nvkm_ramht *ramht, int cookie)
+{
+	struct nvkm_bar *bar = nvkm_bar(ramht);
+	nv_wo32(ramht, cookie + 0, 0x00000000);
+	nv_wo32(ramht, cookie + 4, 0x00000000);
+	if (bar)
+		bar->flush(bar);
+}
+
+static struct nvkm_oclass
+nvkm_ramht_oclass = {
+	.handle = 0x0000abcd,
+	.ofuncs = &(struct nvkm_ofuncs) {
+		.ctor = NULL,
+		.dtor = _nvkm_gpuobj_dtor,
+		.init = _nvkm_gpuobj_init,
+		.fini = _nvkm_gpuobj_fini,
+		.rd32 = _nvkm_gpuobj_rd32,
+		.wr32 = _nvkm_gpuobj_wr32,
+	},
+};
+
+int
+nvkm_ramht_new(struct nvkm_object *parent, struct nvkm_object *pargpu,
+	       u32 size, u32 align, struct nvkm_ramht **pramht)
+{
+	struct nvkm_ramht *ramht;
+	int ret;
+
+	ret = nvkm_gpuobj_create(parent, parent->engine ?
+				 &parent->engine->subdev.object : parent, /* <nv50 ramht */
+				 &nvkm_ramht_oclass, 0, pargpu, size,
+				 align, NVOBJ_FLAG_ZERO_ALLOC, &ramht);
+	*pramht = ramht;
+	if (ret)
+		return ret;
+
+	ramht->bits = order_base_2(nv_gpuobj(ramht)->size >> 3);
+	return 0;
+}