1 files changed, 240 insertions, 0 deletions
diff --git a/drivers/gpu/drm/ttm/ttm_range_manager.c b/drivers/gpu/drm/ttm/ttm_range_manager.c
new file mode 100644
index 000000000..ae11d07eb
--- /dev/null
+++ b/drivers/gpu/drm/ttm/ttm_range_manager.c
@@ -0,0 +1,240 @@
+/* SPDX-License-Identifier: GPL-2.0 OR MIT */
+/**************************************************************************
+ *
+ * Copyright (c) 2007-2010 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>
+ */
+
+#include <drm/ttm/ttm_device.h>
+#include <drm/ttm/ttm_placement.h>
+#include <drm/ttm/ttm_range_manager.h>
+#include <drm/ttm/ttm_bo.h>
+#include <drm/drm_mm.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+
+/*
+ * Currently we use a spinlock for the lock, but a mutex *may* be
+ * more appropriate to reduce scheduling latency if the range manager
+ * ends up with very fragmented allocation patterns.
+ */
+
+struct ttm_range_manager {
+	struct ttm_resource_manager manager;
+	struct drm_mm mm;
+	spinlock_t lock;
+};
+
+static inline struct ttm_range_manager *
+to_range_manager(struct ttm_resource_manager *man)
+{
+	return container_of(man, struct ttm_range_manager, manager);
+}
+
+static int ttm_range_man_alloc(struct ttm_resource_manager *man,
+			       struct ttm_buffer_object *bo,
+			       const struct ttm_place *place,
+			       struct ttm_resource **res)
+{
+	struct ttm_range_manager *rman = to_range_manager(man);
+	struct ttm_range_mgr_node *node;
+	struct drm_mm *mm = &rman->mm;
+	enum drm_mm_insert_mode mode;
+	unsigned long lpfn;
+	int ret;
+
+	lpfn = place->lpfn;
+	if (!lpfn)
+		lpfn = man->size;
+
+	node = kzalloc(struct_size(node, mm_nodes, 1), GFP_KERNEL);
+	if (!node)
+		return -ENOMEM;
+
+	mode = DRM_MM_INSERT_BEST;
+	if (place->flags & TTM_PL_FLAG_TOPDOWN)
+		mode = DRM_MM_INSERT_HIGH;
+
+	ttm_resource_init(bo, place, &node->base);
+
+	spin_lock(&rman->lock);
+	ret = drm_mm_insert_node_in_range(mm, &node->mm_nodes[0],
+					  PFN_UP(node->base.size),
+					  bo->page_alignment, 0,
+					  place->fpfn, lpfn, mode);
+	spin_unlock(&rman->lock);
+
+	if (unlikely(ret)) {
+		ttm_resource_fini(man, &node->base);
+		kfree(node);
+		return ret;
+	}
+
+	node->base.start = node->mm_nodes[0].start;
+	*res = &node->base;
+	return 0;
+}
+
+static void ttm_range_man_free(struct ttm_resource_manager *man,
+			       struct ttm_resource *res)
+{
+	struct ttm_range_mgr_node *node = to_ttm_range_mgr_node(res);
+	struct ttm_range_manager *rman = to_range_manager(man);
+
+	spin_lock(&rman->lock);
+	drm_mm_remove_node(&node->mm_nodes[0]);
+	spin_unlock(&rman->lock);
+
+	ttm_resource_fini(man, res);
+	kfree(node);
+}
+
+static bool ttm_range_man_intersects(struct ttm_resource_manager *man,
+				     struct ttm_resource *res,
+				     const struct ttm_place *place,
+				     size_t size)
+{
+	struct drm_mm_node *node = &to_ttm_range_mgr_node(res)->mm_nodes[0];
+	u32 num_pages = PFN_UP(size);
+
+	/* Don't evict BOs outside of the requested placement range */
+	if (place->fpfn >= (node->start + num_pages) ||
+	    (place->lpfn && place->lpfn <= node->start))
+		return false;
+
+	return true;
+}
+
+static bool ttm_range_man_compatible(struct ttm_resource_manager *man,
+				     struct ttm_resource *res,
+				     const struct ttm_place *place,
+				     size_t size)
+{
+	struct drm_mm_node *node = &to_ttm_range_mgr_node(res)->mm_nodes[0];
+	u32 num_pages = PFN_UP(size);
+
+	if (node->start < place->fpfn ||
+	    (place->lpfn && (node->start + num_pages) > place->lpfn))
+		return false;
+
+	return true;
+}
+
+static void ttm_range_man_debug(struct ttm_resource_manager *man,
+				struct drm_printer *printer)
+{
+	struct ttm_range_manager *rman = to_range_manager(man);
+
+	spin_lock(&rman->lock);
+	drm_mm_print(&rman->mm, printer);
+	spin_unlock(&rman->lock);
+}
+
+static const struct ttm_resource_manager_func ttm_range_manager_func = {
+	.alloc = ttm_range_man_alloc,
+	.free = ttm_range_man_free,
+	.intersects = ttm_range_man_intersects,
+	.compatible = ttm_range_man_compatible,
+	.debug = ttm_range_man_debug
+};
+
+/**
+ * ttm_range_man_init_nocheck - Initialise a generic range manager for the
+ * selected memory type.
+ *
+ * @bdev: ttm device
+ * @type: memory manager type
+ * @use_tt: if the memory manager uses tt
+ * @p_size: size of area to be managed in pages.
+ *
+ * The range manager is installed for this device in the type slot.
+ *
+ * Return: %0 on success or a negative error code on failure
+ */
+int ttm_range_man_init_nocheck(struct ttm_device *bdev,
+		       unsigned type, bool use_tt,
+		       unsigned long p_size)
+{
+	struct ttm_resource_manager *man;
+	struct ttm_range_manager *rman;
+
+	rman = kzalloc(sizeof(*rman), GFP_KERNEL);
+	if (!rman)
+		return -ENOMEM;
+
+	man = &rman->manager;
+	man->use_tt = use_tt;
+
+	man->func = &ttm_range_manager_func;
+
+	ttm_resource_manager_init(man, bdev, p_size);
+
+	drm_mm_init(&rman->mm, 0, p_size);
+	spin_lock_init(&rman->lock);
+
+	ttm_set_driver_manager(bdev, type, &rman->manager);
+	ttm_resource_manager_set_used(man, true);
+	return 0;
+}
+EXPORT_SYMBOL(ttm_range_man_init_nocheck);
+
+/**
+ * ttm_range_man_fini_nocheck - Remove the generic range manager from a slot
+ * and tear it down.
+ *
+ * @bdev: ttm device
+ * @type: memory manager type
+ *
+ * Return: %0 on success or a negative error code on failure
+ */
+int ttm_range_man_fini_nocheck(struct ttm_device *bdev,
+		       unsigned type)
+{
+	struct ttm_resource_manager *man = ttm_manager_type(bdev, type);
+	struct ttm_range_manager *rman = to_range_manager(man);
+	struct drm_mm *mm = &rman->mm;
+	int ret;
+
+	if (!man)
+		return 0;
+
+	ttm_resource_manager_set_used(man, false);
+
+	ret = ttm_resource_manager_evict_all(bdev, man);
+	if (ret)
+		return ret;
+
+	spin_lock(&rman->lock);
+	drm_mm_takedown(mm);
+	spin_unlock(&rman->lock);
+
+	ttm_resource_manager_cleanup(man);
+	ttm_set_driver_manager(bdev, type, NULL);
+	kfree(rman);
+	return 0;
+}
+EXPORT_SYMBOL(ttm_range_man_fini_nocheck);