1 files changed, 222 insertions, 0 deletions

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c
new file mode 100644
index 000000000000..180eed7c8bca
--- /dev/null
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c
@@ -0,0 +1,222 @@
+/*
+ * Copyright 2016 Advanced Micro Devices, 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.
+ *
+ * Authors: Christian König
+ */
+
+#include <drm/drmP.h>
+#include "amdgpu.h"
+
+struct amdgpu_vram_mgr {
+        struct drm_mm mm;
+        spinlock_t lock;
+};
+
+/**
+ * amdgpu_vram_mgr_init - init VRAM manager and DRM MM
+ *
+ * @man: TTM memory type manager
+ * @p_size: maximum size of VRAM
+ *
+ * Allocate and initialize the VRAM manager.
+ */
+static int amdgpu_vram_mgr_init(struct ttm_mem_type_manager *man,
+                                unsigned long p_size)
+{
+        struct amdgpu_vram_mgr *mgr;
+
+        mgr = kzalloc(sizeof(*mgr), GFP_KERNEL);
+        if (!mgr)
+                return -ENOMEM;
+
+        drm_mm_init(&mgr->mm, 0, p_size);
+        spin_lock_init(&mgr->lock);
+        man->priv = mgr;
+        return 0;
+}
+
+/**
+ * amdgpu_vram_mgr_fini - free and destroy VRAM manager
+ *
+ * @man: TTM memory type manager
+ *
+ * Destroy and free the VRAM manager, returns -EBUSY if ranges are still
+ * allocated inside it.
+ */
+static int amdgpu_vram_mgr_fini(struct ttm_mem_type_manager *man)
+{
+        struct amdgpu_vram_mgr *mgr = man->priv;
+
+        spin_lock(&mgr->lock);
+        if (!drm_mm_clean(&mgr->mm)) {
+                spin_unlock(&mgr->lock);
+                return -EBUSY;
+        }
+
+        drm_mm_takedown(&mgr->mm);
+        spin_unlock(&mgr->lock);
+        kfree(mgr);
+        man->priv = NULL;
+        return 0;
+}
+
+/**
+ * amdgpu_vram_mgr_new - allocate new ranges
+ *
+ * @man: TTM memory type manager
+ * @tbo: TTM BO we need this range for
+ * @place: placement flags and restrictions
+ * @mem: the resulting mem object
+ *
+ * Allocate VRAM for the given BO.
+ */
+static int amdgpu_vram_mgr_new(struct ttm_mem_type_manager *man,
+                               struct ttm_buffer_object *tbo,
+                               const struct ttm_place *place,
+                               struct ttm_mem_reg *mem)
+{
+        struct amdgpu_bo *bo = container_of(tbo, struct amdgpu_bo, tbo);
+        struct amdgpu_vram_mgr *mgr = man->priv;
+        struct drm_mm *mm = &mgr->mm;
+        struct drm_mm_node *nodes;
+        enum drm_mm_search_flags sflags = DRM_MM_SEARCH_DEFAULT;
+        enum drm_mm_allocator_flags aflags = DRM_MM_CREATE_DEFAULT;
+        unsigned long lpfn, num_nodes, pages_per_node, pages_left;
+        unsigned i;
+        int r;
+
+        lpfn = place->lpfn;
+        if (!lpfn)
+                lpfn = man->size;
+
+        if (bo->flags & AMDGPU_GEM_CREATE_VRAM_CONTIGUOUS ||
+            amdgpu_vram_page_split == -1) {
+                pages_per_node = ~0ul;
+                num_nodes = 1;
+        } else {
+                pages_per_node = max((uint32_t)amdgpu_vram_page_split,
+                                     mem->page_alignment);
+                num_nodes = DIV_ROUND_UP(mem->num_pages, pages_per_node);
+        }
+
+        nodes = kcalloc(num_nodes, sizeof(*nodes), GFP_KERNEL);
+        if (!nodes)
+                return -ENOMEM;
+
+        if (place->flags & TTM_PL_FLAG_TOPDOWN) {
+                sflags = DRM_MM_SEARCH_BELOW;
+                aflags = DRM_MM_CREATE_TOP;
+        }
+
+        pages_left = mem->num_pages;
+
+        spin_lock(&mgr->lock);
+        for (i = 0; i < num_nodes; ++i) {
+                unsigned long pages = min(pages_left, pages_per_node);
+                uint32_t alignment = mem->page_alignment;
+
+                if (pages == pages_per_node)
+                        alignment = pages_per_node;
+                else
+                        sflags |= DRM_MM_SEARCH_BEST;
+
+                r = drm_mm_insert_node_in_range_generic(mm, &nodes[i], pages,
+                                                        alignment, 0,
+                                                        place->fpfn, lpfn,
+                                                        sflags, aflags);
+                if (unlikely(r))
+                        goto error;
+
+                pages_left -= pages;
+        }
+        spin_unlock(&mgr->lock);
+
+        mem->start = num_nodes == 1 ? nodes[0].start : AMDGPU_BO_INVALID_OFFSET;
+        mem->mm_node = nodes;
+
+        return 0;
+
+error:
+        while (i--)
+                drm_mm_remove_node(&nodes[i]);
+        spin_unlock(&mgr->lock);
+
+        kfree(nodes);
+        return r == -ENOSPC ? 0 : r;
+}
+
+/**
+ * amdgpu_vram_mgr_del - free ranges
+ *
+ * @man: TTM memory type manager
+ * @tbo: TTM BO we need this range for
+ * @place: placement flags and restrictions
+ * @mem: TTM memory object
+ *
+ * Free the allocated VRAM again.
+ */
+static void amdgpu_vram_mgr_del(struct ttm_mem_type_manager *man,
+                                struct ttm_mem_reg *mem)
+{
+        struct amdgpu_vram_mgr *mgr = man->priv;
+        struct drm_mm_node *nodes = mem->mm_node;
+        unsigned pages = mem->num_pages;
+
+        if (!mem->mm_node)
+                return;
+
+        spin_lock(&mgr->lock);
+        while (pages) {
+                pages -= nodes->size;
+                drm_mm_remove_node(nodes);
+                ++nodes;
+        }
+        spin_unlock(&mgr->lock);
+
+        kfree(mem->mm_node);
+        mem->mm_node = NULL;
+}
+
+/**
+ * amdgpu_vram_mgr_debug - dump VRAM table
+ *
+ * @man: TTM memory type manager
+ * @prefix: text prefix
+ *
+ * Dump the table content using printk.
+ */
+static void amdgpu_vram_mgr_debug(struct ttm_mem_type_manager *man,
+                                  const char *prefix)
+{
+        struct amdgpu_vram_mgr *mgr = man->priv;
+
+        spin_lock(&mgr->lock);
+        drm_mm_debug_table(&mgr->mm, prefix);
+        spin_unlock(&mgr->lock);
+}
+
+const struct ttm_mem_type_manager_func amdgpu_vram_mgr_func = {
+        amdgpu_vram_mgr_init,
+        amdgpu_vram_mgr_fini,
+        amdgpu_vram_mgr_new,
+        amdgpu_vram_mgr_del,
+        amdgpu_vram_mgr_debug
+};