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