1 files changed, 324 insertions, 0 deletions
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_gtt_mgr.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_gtt_mgr.c
new file mode 100644
index 000000000..44367f033
--- /dev/null
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_gtt_mgr.c
@@ -0,0 +1,324 @@
+/*
+ * 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/ttm/ttm_range_manager.h>
+
+#include "amdgpu.h"
+
+static inline struct amdgpu_gtt_mgr *
+to_gtt_mgr(struct ttm_resource_manager *man)
+{
+	return container_of(man, struct amdgpu_gtt_mgr, manager);
+}
+
+/**
+ * DOC: mem_info_gtt_total
+ *
+ * The amdgpu driver provides a sysfs API for reporting current total size of
+ * the GTT.
+ * The file mem_info_gtt_total is used for this, and returns the total size of
+ * the GTT block, in bytes
+ */
+static ssize_t amdgpu_mem_info_gtt_total_show(struct device *dev,
+					      struct device_attribute *attr,
+					      char *buf)
+{
+	struct drm_device *ddev = dev_get_drvdata(dev);
+	struct amdgpu_device *adev = drm_to_adev(ddev);
+	struct ttm_resource_manager *man;
+
+	man = ttm_manager_type(&adev->mman.bdev, TTM_PL_TT);
+	return sysfs_emit(buf, "%llu\n", man->size);
+}
+
+/**
+ * DOC: mem_info_gtt_used
+ *
+ * The amdgpu driver provides a sysfs API for reporting current total amount of
+ * used GTT.
+ * The file mem_info_gtt_used is used for this, and returns the current used
+ * size of the GTT block, in bytes
+ */
+static ssize_t amdgpu_mem_info_gtt_used_show(struct device *dev,
+					     struct device_attribute *attr,
+					     char *buf)
+{
+	struct drm_device *ddev = dev_get_drvdata(dev);
+	struct amdgpu_device *adev = drm_to_adev(ddev);
+	struct ttm_resource_manager *man = &adev->mman.gtt_mgr.manager;
+
+	return sysfs_emit(buf, "%llu\n", ttm_resource_manager_usage(man));
+}
+
+static DEVICE_ATTR(mem_info_gtt_total, S_IRUGO,
+	           amdgpu_mem_info_gtt_total_show, NULL);
+static DEVICE_ATTR(mem_info_gtt_used, S_IRUGO,
+	           amdgpu_mem_info_gtt_used_show, NULL);
+
+static struct attribute *amdgpu_gtt_mgr_attributes[] = {
+	&dev_attr_mem_info_gtt_total.attr,
+	&dev_attr_mem_info_gtt_used.attr,
+	NULL
+};
+
+const struct attribute_group amdgpu_gtt_mgr_attr_group = {
+	.attrs = amdgpu_gtt_mgr_attributes
+};
+
+/**
+ * amdgpu_gtt_mgr_has_gart_addr - Check if mem has address space
+ *
+ * @res: the mem object to check
+ *
+ * Check if a mem object has already address space allocated.
+ */
+bool amdgpu_gtt_mgr_has_gart_addr(struct ttm_resource *res)
+{
+	struct ttm_range_mgr_node *node = to_ttm_range_mgr_node(res);
+
+	return drm_mm_node_allocated(&node->mm_nodes[0]);
+}
+
+/**
+ * amdgpu_gtt_mgr_new - allocate a new node
+ *
+ * @man: TTM memory type manager
+ * @tbo: TTM BO we need this range for
+ * @place: placement flags and restrictions
+ * @res: the resulting mem object
+ *
+ * Dummy, allocate the node but no space for it yet.
+ */
+static int amdgpu_gtt_mgr_new(struct ttm_resource_manager *man,
+			      struct ttm_buffer_object *tbo,
+			      const struct ttm_place *place,
+			      struct ttm_resource **res)
+{
+	struct amdgpu_gtt_mgr *mgr = to_gtt_mgr(man);
+	uint32_t num_pages = PFN_UP(tbo->base.size);
+	struct ttm_range_mgr_node *node;
+	int r;
+
+	node = kzalloc(struct_size(node, mm_nodes, 1), GFP_KERNEL);
+	if (!node)
+		return -ENOMEM;
+
+	ttm_resource_init(tbo, place, &node->base);
+	if (!(place->flags & TTM_PL_FLAG_TEMPORARY) &&
+	    ttm_resource_manager_usage(man) > man->size) {
+		r = -ENOSPC;
+		goto err_free;
+	}
+
+	if (place->lpfn) {
+		spin_lock(&mgr->lock);
+		r = drm_mm_insert_node_in_range(&mgr->mm, &node->mm_nodes[0],
+						num_pages, tbo->page_alignment,
+						0, place->fpfn, place->lpfn,
+						DRM_MM_INSERT_BEST);
+		spin_unlock(&mgr->lock);
+		if (unlikely(r))
+			goto err_free;
+
+		node->base.start = node->mm_nodes[0].start;
+	} else {
+		node->mm_nodes[0].start = 0;
+		node->mm_nodes[0].size = PFN_UP(node->base.size);
+		node->base.start = AMDGPU_BO_INVALID_OFFSET;
+	}
+
+	*res = &node->base;
+	return 0;
+
+err_free:
+	ttm_resource_fini(man, &node->base);
+	kfree(node);
+	return r;
+}
+
+/**
+ * amdgpu_gtt_mgr_del - free ranges
+ *
+ * @man: TTM memory type manager
+ * @res: TTM memory object
+ *
+ * Free the allocated GTT again.
+ */
+static void amdgpu_gtt_mgr_del(struct ttm_resource_manager *man,
+			       struct ttm_resource *res)
+{
+	struct ttm_range_mgr_node *node = to_ttm_range_mgr_node(res);
+	struct amdgpu_gtt_mgr *mgr = to_gtt_mgr(man);
+
+	spin_lock(&mgr->lock);
+	if (drm_mm_node_allocated(&node->mm_nodes[0]))
+		drm_mm_remove_node(&node->mm_nodes[0]);
+	spin_unlock(&mgr->lock);
+
+	ttm_resource_fini(man, res);
+	kfree(node);
+}
+
+/**
+ * amdgpu_gtt_mgr_recover - re-init gart
+ *
+ * @mgr: amdgpu_gtt_mgr pointer
+ *
+ * Re-init the gart for each known BO in the GTT.
+ */
+void amdgpu_gtt_mgr_recover(struct amdgpu_gtt_mgr *mgr)
+{
+	struct ttm_range_mgr_node *node;
+	struct drm_mm_node *mm_node;
+	struct amdgpu_device *adev;
+
+	adev = container_of(mgr, typeof(*adev), mman.gtt_mgr);
+	spin_lock(&mgr->lock);
+	drm_mm_for_each_node(mm_node, &mgr->mm) {
+		node = container_of(mm_node, typeof(*node), mm_nodes[0]);
+		amdgpu_ttm_recover_gart(node->base.bo);
+	}
+	spin_unlock(&mgr->lock);
+
+	amdgpu_gart_invalidate_tlb(adev);
+}
+
+/**
+ * amdgpu_gtt_mgr_intersects - test for intersection
+ *
+ * @man: Our manager object
+ * @res: The resource to test
+ * @place: The place for the new allocation
+ * @size: The size of the new allocation
+ *
+ * Simplified intersection test, only interesting if we need GART or not.
+ */
+static bool amdgpu_gtt_mgr_intersects(struct ttm_resource_manager *man,
+				      struct ttm_resource *res,
+				      const struct ttm_place *place,
+				      size_t size)
+{
+	return !place->lpfn || amdgpu_gtt_mgr_has_gart_addr(res);
+}
+
+/**
+ * amdgpu_gtt_mgr_compatible - test for compatibility
+ *
+ * @man: Our manager object
+ * @res: The resource to test
+ * @place: The place for the new allocation
+ * @size: The size of the new allocation
+ *
+ * Simplified compatibility test.
+ */
+static bool amdgpu_gtt_mgr_compatible(struct ttm_resource_manager *man,
+				      struct ttm_resource *res,
+				      const struct ttm_place *place,
+				      size_t size)
+{
+	return !place->lpfn || amdgpu_gtt_mgr_has_gart_addr(res);
+}
+
+/**
+ * amdgpu_gtt_mgr_debug - dump VRAM table
+ *
+ * @man: TTM memory type manager
+ * @printer: DRM printer to use
+ *
+ * Dump the table content using printk.
+ */
+static void amdgpu_gtt_mgr_debug(struct ttm_resource_manager *man,
+				 struct drm_printer *printer)
+{
+	struct amdgpu_gtt_mgr *mgr = to_gtt_mgr(man);
+
+	spin_lock(&mgr->lock);
+	drm_mm_print(&mgr->mm, printer);
+	spin_unlock(&mgr->lock);
+}
+
+static const struct ttm_resource_manager_func amdgpu_gtt_mgr_func = {
+	.alloc = amdgpu_gtt_mgr_new,
+	.free = amdgpu_gtt_mgr_del,
+	.intersects = amdgpu_gtt_mgr_intersects,
+	.compatible = amdgpu_gtt_mgr_compatible,
+	.debug = amdgpu_gtt_mgr_debug
+};
+
+/**
+ * amdgpu_gtt_mgr_init - init GTT manager and DRM MM
+ *
+ * @adev: amdgpu_device pointer
+ * @gtt_size: maximum size of GTT
+ *
+ * Allocate and initialize the GTT manager.
+ */
+int amdgpu_gtt_mgr_init(struct amdgpu_device *adev, uint64_t gtt_size)
+{
+	struct amdgpu_gtt_mgr *mgr = &adev->mman.gtt_mgr;
+	struct ttm_resource_manager *man = &mgr->manager;
+	uint64_t start, size;
+
+	man->use_tt = true;
+	man->func = &amdgpu_gtt_mgr_func;
+
+	ttm_resource_manager_init(man, &adev->mman.bdev, gtt_size);
+
+	start = AMDGPU_GTT_MAX_TRANSFER_SIZE * AMDGPU_GTT_NUM_TRANSFER_WINDOWS;
+	size = (adev->gmc.gart_size >> PAGE_SHIFT) - start;
+	drm_mm_init(&mgr->mm, start, size);
+	spin_lock_init(&mgr->lock);
+
+	ttm_set_driver_manager(&adev->mman.bdev, TTM_PL_TT, &mgr->manager);
+	ttm_resource_manager_set_used(man, true);
+	return 0;
+}
+
+/**
+ * amdgpu_gtt_mgr_fini - free and destroy GTT manager
+ *
+ * @adev: amdgpu_device pointer
+ *
+ * Destroy and free the GTT manager, returns -EBUSY if ranges are still
+ * allocated inside it.
+ */
+void amdgpu_gtt_mgr_fini(struct amdgpu_device *adev)
+{
+	struct amdgpu_gtt_mgr *mgr = &adev->mman.gtt_mgr;
+	struct ttm_resource_manager *man = &mgr->manager;
+	int ret;
+
+	ttm_resource_manager_set_used(man, false);
+
+	ret = ttm_resource_manager_evict_all(&adev->mman.bdev, man);
+	if (ret)
+		return;
+
+	spin_lock(&mgr->lock);
+	drm_mm_takedown(&mgr->mm);
+	spin_unlock(&mgr->lock);
+
+	ttm_resource_manager_cleanup(man);
+	ttm_set_driver_manager(&adev->mman.bdev, TTM_PL_TT, NULL);
+}