Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / gpu / drm / ttm / ttm_bo_manager.c

diff --git a/kernel/drivers/gpu/drm/ttm/ttm_bo_manager.c b/kernel/drivers/gpu/drm/ttm/ttm_bo_manager.c
new file mode 100644 (file)
index 0000000..aa0bd05
--- /dev/null
+++ b/kernel/drivers/gpu/drm/ttm/ttm_bo_manager.c
@@ -0,0 +1,157 @@
+/**************************************************************************
+ *
+ * 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_module.h>
+#include <drm/ttm/ttm_bo_driver.h>
+#include <drm/ttm/ttm_placement.h>
+#include <drm/drm_mm.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <linux/module.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 drm_mm mm;
+       spinlock_t lock;
+};
+
+static int ttm_bo_man_get_node(struct ttm_mem_type_manager *man,
+                              struct ttm_buffer_object *bo,
+                              const struct ttm_place *place,
+                              struct ttm_mem_reg *mem)
+{
+       struct ttm_range_manager *rman = (struct ttm_range_manager *) man->priv;
+       struct drm_mm *mm = &rman->mm;
+       struct drm_mm_node *node = NULL;
+       enum drm_mm_search_flags sflags = DRM_MM_SEARCH_BEST;
+       enum drm_mm_allocator_flags aflags = DRM_MM_CREATE_DEFAULT;
+       unsigned long lpfn;
+       int ret;
+
+       lpfn = place->lpfn;
+       if (!lpfn)
+               lpfn = man->size;
+
+       node = kzalloc(sizeof(*node), GFP_KERNEL);
+       if (!node)
+               return -ENOMEM;
+
+       if (place->flags & TTM_PL_FLAG_TOPDOWN) {
+               sflags = DRM_MM_SEARCH_BELOW;
+               aflags = DRM_MM_CREATE_TOP;
+       }
+
+       spin_lock(&rman->lock);
+       ret = drm_mm_insert_node_in_range_generic(mm, node, mem->num_pages,
+                                         mem->page_alignment, 0,
+                                         place->fpfn, lpfn,
+                                         sflags, aflags);
+       spin_unlock(&rman->lock);
+
+       if (unlikely(ret)) {
+               kfree(node);
+       } else {
+               mem->mm_node = node;
+               mem->start = node->start;
+       }
+
+       return 0;
+}
+
+static void ttm_bo_man_put_node(struct ttm_mem_type_manager *man,
+                               struct ttm_mem_reg *mem)
+{
+       struct ttm_range_manager *rman = (struct ttm_range_manager *) man->priv;
+
+       if (mem->mm_node) {
+               spin_lock(&rman->lock);
+               drm_mm_remove_node(mem->mm_node);
+               spin_unlock(&rman->lock);
+
+               kfree(mem->mm_node);
+               mem->mm_node = NULL;
+       }
+}
+
+static int ttm_bo_man_init(struct ttm_mem_type_manager *man,
+                          unsigned long p_size)
+{
+       struct ttm_range_manager *rman;
+
+       rman = kzalloc(sizeof(*rman), GFP_KERNEL);
+       if (!rman)
+               return -ENOMEM;
+
+       drm_mm_init(&rman->mm, 0, p_size);
+       spin_lock_init(&rman->lock);
+       man->priv = rman;
+       return 0;
+}
+
+static int ttm_bo_man_takedown(struct ttm_mem_type_manager *man)
+{
+       struct ttm_range_manager *rman = (struct ttm_range_manager *) man->priv;
+       struct drm_mm *mm = &rman->mm;
+
+       spin_lock(&rman->lock);
+       if (drm_mm_clean(mm)) {
+               drm_mm_takedown(mm);
+               spin_unlock(&rman->lock);
+               kfree(rman);
+               man->priv = NULL;
+               return 0;
+       }
+       spin_unlock(&rman->lock);
+       return -EBUSY;
+}
+
+static void ttm_bo_man_debug(struct ttm_mem_type_manager *man,
+                            const char *prefix)
+{
+       struct ttm_range_manager *rman = (struct ttm_range_manager *) man->priv;
+
+       spin_lock(&rman->lock);
+       drm_mm_debug_table(&rman->mm, prefix);
+       spin_unlock(&rman->lock);
+}
+
+const struct ttm_mem_type_manager_func ttm_bo_manager_func = {
+       ttm_bo_man_init,
+       ttm_bo_man_takedown,
+       ttm_bo_man_get_node,
+       ttm_bo_man_put_node,
+       ttm_bo_man_debug
+};
+EXPORT_SYMBOL(ttm_bo_manager_func);