1 files changed, 144 insertions, 0 deletions
diff --git a/drivers/gpu/drm/ttm/ttm_agp_backend.c b/drivers/gpu/drm/ttm/ttm_agp_backend.c
new file mode 100644
index 000000000..d27691f2e
--- /dev/null
+++ b/drivers/gpu/drm/ttm/ttm_agp_backend.c
@@ -0,0 +1,144 @@
+/* SPDX-License-Identifier: GPL-2.0 OR MIT */
+/**************************************************************************
+ *
+ * Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA
+ * 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, sub license, 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 NON-INFRINGEMENT. IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS 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.
+ *
+ **************************************************************************/
+/*
+ * Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
+ *          Keith Packard.
+ */
+
+#define pr_fmt(fmt) "[TTM] " fmt
+
+#include <drm/ttm/ttm_device.h>
+#include <drm/ttm/ttm_tt.h>
+#include <drm/ttm/ttm_resource.h>
+#include <linux/agp_backend.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/io.h>
+#include <asm/agp.h>
+
+struct ttm_agp_backend {
+	struct ttm_tt ttm;
+	struct agp_memory *mem;
+	struct agp_bridge_data *bridge;
+};
+
+int ttm_agp_bind(struct ttm_tt *ttm, struct ttm_resource *bo_mem)
+{
+	struct ttm_agp_backend *agp_be = container_of(ttm, struct ttm_agp_backend, ttm);
+	struct page *dummy_read_page = ttm_glob.dummy_read_page;
+	struct agp_memory *mem;
+	int ret, cached = ttm->caching == ttm_cached;
+	unsigned i;
+
+	if (agp_be->mem)
+		return 0;
+
+	mem = agp_allocate_memory(agp_be->bridge, ttm->num_pages, AGP_USER_MEMORY);
+	if (unlikely(mem == NULL))
+		return -ENOMEM;
+
+	mem->page_count = 0;
+	for (i = 0; i < ttm->num_pages; i++) {
+		struct page *page = ttm->pages[i];
+
+		if (!page)
+			page = dummy_read_page;
+
+		mem->pages[mem->page_count++] = page;
+	}
+	agp_be->mem = mem;
+
+	mem->is_flushed = 1;
+	mem->type = (cached) ? AGP_USER_CACHED_MEMORY : AGP_USER_MEMORY;
+
+	ret = agp_bind_memory(mem, bo_mem->start);
+	if (ret)
+		pr_err("AGP Bind memory failed\n");
+
+	return ret;
+}
+EXPORT_SYMBOL(ttm_agp_bind);
+
+void ttm_agp_unbind(struct ttm_tt *ttm)
+{
+	struct ttm_agp_backend *agp_be = container_of(ttm, struct ttm_agp_backend, ttm);
+
+	if (agp_be->mem) {
+		if (agp_be->mem->is_bound) {
+			agp_unbind_memory(agp_be->mem);
+			return;
+		}
+		agp_free_memory(agp_be->mem);
+		agp_be->mem = NULL;
+	}
+}
+EXPORT_SYMBOL(ttm_agp_unbind);
+
+bool ttm_agp_is_bound(struct ttm_tt *ttm)
+{
+	struct ttm_agp_backend *agp_be = container_of(ttm, struct ttm_agp_backend, ttm);
+
+	if (!ttm)
+		return false;
+
+	return (agp_be->mem != NULL);
+}
+EXPORT_SYMBOL(ttm_agp_is_bound);
+
+void ttm_agp_destroy(struct ttm_tt *ttm)
+{
+	struct ttm_agp_backend *agp_be = container_of(ttm, struct ttm_agp_backend, ttm);
+
+	if (agp_be->mem)
+		ttm_agp_unbind(ttm);
+	ttm_tt_fini(ttm);
+	kfree(agp_be);
+}
+EXPORT_SYMBOL(ttm_agp_destroy);
+
+struct ttm_tt *ttm_agp_tt_create(struct ttm_buffer_object *bo,
+				 struct agp_bridge_data *bridge,
+				 uint32_t page_flags)
+{
+	struct ttm_agp_backend *agp_be;
+
+	agp_be = kmalloc(sizeof(*agp_be), GFP_KERNEL);
+	if (!agp_be)
+		return NULL;
+
+	agp_be->mem = NULL;
+	agp_be->bridge = bridge;
+
+	if (ttm_tt_init(&agp_be->ttm, bo, page_flags, ttm_write_combined, 0)) {
+		kfree(agp_be);
+		return NULL;
+	}
+
+	return &agp_be->ttm;
+}
+EXPORT_SYMBOL(ttm_agp_tt_create);