266 lines
7.4 KiB
C
266 lines
7.4 KiB
C
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// SPDX-License-Identifier: MIT
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/*
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* Copyright © 2021 Intel Corporation
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*/
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#include <drm/ttm/ttm_device.h>
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#include <drm/ttm/ttm_range_manager.h>
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#include "i915_drv.h"
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#include "i915_scatterlist.h"
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#include "i915_ttm_buddy_manager.h"
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#include "intel_region_ttm.h"
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#include "gem/i915_gem_region.h"
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#include "gem/i915_gem_ttm.h" /* For the funcs/ops export only */
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/**
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* DOC: TTM support structure
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*
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* The code in this file deals with setting up memory managers for TTM
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* LMEM and MOCK regions and converting the output from
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* the managers to struct sg_table, Basically providing the mapping from
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* i915 GEM regions to TTM memory types and resource managers.
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*/
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/**
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* intel_region_ttm_device_init - Initialize a TTM device
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* @dev_priv: Pointer to an i915 device private structure.
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*
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* Return: 0 on success, negative error code on failure.
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*/
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int intel_region_ttm_device_init(struct drm_i915_private *dev_priv)
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{
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struct drm_device *drm = &dev_priv->drm;
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return ttm_device_init(&dev_priv->bdev, i915_ttm_driver(),
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drm->dev, drm->anon_inode->i_mapping,
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drm->vma_offset_manager, false, false);
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}
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/**
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* intel_region_ttm_device_fini - Finalize a TTM device
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* @dev_priv: Pointer to an i915 device private structure.
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*/
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void intel_region_ttm_device_fini(struct drm_i915_private *dev_priv)
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{
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ttm_device_fini(&dev_priv->bdev);
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}
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/*
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* Map the i915 memory regions to TTM memory types. We use the
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* driver-private types for now, reserving TTM_PL_VRAM for stolen
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* memory and TTM_PL_TT for GGTT use if decided to implement this.
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*/
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int intel_region_to_ttm_type(const struct intel_memory_region *mem)
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{
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int type;
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GEM_BUG_ON(mem->type != INTEL_MEMORY_LOCAL &&
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mem->type != INTEL_MEMORY_MOCK &&
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mem->type != INTEL_MEMORY_SYSTEM);
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if (mem->type == INTEL_MEMORY_SYSTEM)
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return TTM_PL_SYSTEM;
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type = mem->instance + TTM_PL_PRIV;
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GEM_BUG_ON(type >= TTM_NUM_MEM_TYPES);
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return type;
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}
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/**
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* intel_region_ttm_init - Initialize a memory region for TTM.
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* @mem: The region to initialize.
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*
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* This function initializes a suitable TTM resource manager for the
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* region, and if it's a LMEM region type, attaches it to the TTM
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* device. MOCK regions are NOT attached to the TTM device, since we don't
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* have one for the mock selftests.
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*
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* Return: 0 on success, negative error code on failure.
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*/
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int intel_region_ttm_init(struct intel_memory_region *mem)
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{
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struct ttm_device *bdev = &mem->i915->bdev;
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int mem_type = intel_region_to_ttm_type(mem);
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int ret;
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ret = i915_ttm_buddy_man_init(bdev, mem_type, false,
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resource_size(&mem->region),
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mem->io_size,
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mem->min_page_size, PAGE_SIZE);
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if (ret)
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return ret;
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mem->region_private = ttm_manager_type(bdev, mem_type);
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return 0;
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}
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/**
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* intel_region_ttm_fini - Finalize a TTM region.
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* @mem: The memory region
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*
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* This functions takes down the TTM resource manager associated with the
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* memory region, and if it was registered with the TTM device,
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* removes that registration.
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*/
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int intel_region_ttm_fini(struct intel_memory_region *mem)
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{
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struct ttm_resource_manager *man = mem->region_private;
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int ret = -EBUSY;
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int count;
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/*
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* Put the region's move fences. This releases requests that
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* may hold on to contexts and vms that may hold on to buffer
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* objects placed in this region.
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*/
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if (man)
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ttm_resource_manager_cleanup(man);
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/* Flush objects from region. */
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for (count = 0; count < 10; ++count) {
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i915_gem_flush_free_objects(mem->i915);
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mutex_lock(&mem->objects.lock);
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if (list_empty(&mem->objects.list))
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ret = 0;
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mutex_unlock(&mem->objects.lock);
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if (!ret)
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break;
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msleep(20);
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drain_workqueue(mem->i915->bdev.wq);
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}
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/* If we leaked objects, Don't free the region causing use after free */
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if (ret || !man)
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return ret;
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ret = i915_ttm_buddy_man_fini(&mem->i915->bdev,
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intel_region_to_ttm_type(mem));
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GEM_WARN_ON(ret);
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mem->region_private = NULL;
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return ret;
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}
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/**
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* intel_region_ttm_resource_to_rsgt -
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* Convert an opaque TTM resource manager resource to a refcounted sg_table.
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* @mem: The memory region.
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* @res: The resource manager resource obtained from the TTM resource manager.
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* @page_alignment: Required page alignment for each sg entry. Power of two.
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*
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* The gem backends typically use sg-tables for operations on the underlying
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* io_memory. So provide a way for the backends to translate the
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* nodes they are handed from TTM to sg-tables.
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*
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* Return: A malloced sg_table on success, an error pointer on failure.
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*/
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struct i915_refct_sgt *
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intel_region_ttm_resource_to_rsgt(struct intel_memory_region *mem,
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struct ttm_resource *res,
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u32 page_alignment)
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{
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if (mem->is_range_manager) {
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struct ttm_range_mgr_node *range_node =
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to_ttm_range_mgr_node(res);
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return i915_rsgt_from_mm_node(&range_node->mm_nodes[0],
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mem->region.start,
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page_alignment);
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} else {
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return i915_rsgt_from_buddy_resource(res, mem->region.start,
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page_alignment);
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}
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}
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#ifdef CONFIG_DRM_I915_SELFTEST
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/**
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* intel_region_ttm_resource_alloc - Allocate memory resources from a region
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* @mem: The memory region,
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* @size: The requested size in bytes
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* @flags: Allocation flags
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*
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* This functionality is provided only for callers that need to allocate
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* memory from standalone TTM range managers, without the TTM eviction
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* functionality. Don't use if you are not completely sure that's the
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* case. The returned opaque node can be converted to an sg_table using
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* intel_region_ttm_resource_to_st(), and can be freed using
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* intel_region_ttm_resource_free().
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*
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* Return: A valid pointer on success, an error pointer on failure.
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*/
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struct ttm_resource *
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intel_region_ttm_resource_alloc(struct intel_memory_region *mem,
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resource_size_t offset,
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resource_size_t size,
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unsigned int flags)
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{
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struct ttm_resource_manager *man = mem->region_private;
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struct ttm_place place = {};
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struct ttm_buffer_object mock_bo = {};
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struct ttm_resource *res;
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int ret;
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if (flags & I915_BO_ALLOC_CONTIGUOUS)
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place.flags |= TTM_PL_FLAG_CONTIGUOUS;
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if (offset != I915_BO_INVALID_OFFSET) {
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if (WARN_ON(overflows_type(offset >> PAGE_SHIFT, place.fpfn))) {
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ret = -E2BIG;
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goto out;
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}
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place.fpfn = offset >> PAGE_SHIFT;
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if (WARN_ON(overflows_type(place.fpfn + (size >> PAGE_SHIFT), place.lpfn))) {
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ret = -E2BIG;
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goto out;
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}
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place.lpfn = place.fpfn + (size >> PAGE_SHIFT);
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} else if (mem->io_size && mem->io_size < mem->total) {
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if (flags & I915_BO_ALLOC_GPU_ONLY) {
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place.flags |= TTM_PL_FLAG_TOPDOWN;
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} else {
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place.fpfn = 0;
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if (WARN_ON(overflows_type(mem->io_size >> PAGE_SHIFT, place.lpfn))) {
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ret = -E2BIG;
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goto out;
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}
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place.lpfn = mem->io_size >> PAGE_SHIFT;
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}
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}
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mock_bo.base.size = size;
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mock_bo.bdev = &mem->i915->bdev;
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ret = man->func->alloc(man, &mock_bo, &place, &res);
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out:
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if (ret == -ENOSPC)
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ret = -ENXIO;
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if (!ret)
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res->bo = NULL; /* Rather blow up, then some uaf */
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return ret ? ERR_PTR(ret) : res;
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}
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#endif
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/**
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* intel_region_ttm_resource_free - Free a resource allocated from a resource manager
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* @mem: The region the resource was allocated from.
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* @res: The opaque resource representing an allocation.
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*/
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void intel_region_ttm_resource_free(struct intel_memory_region *mem,
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struct ttm_resource *res)
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{
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struct ttm_resource_manager *man = mem->region_private;
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struct ttm_buffer_object mock_bo = {};
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mock_bo.base.size = res->size;
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mock_bo.bdev = &mem->i915->bdev;
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res->bo = &mock_bo;
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man->func->free(man, res);
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}
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