--- /dev/null
+/*
+ * 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
+};
projects / linux-beck.git / commitdiff