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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 "intel_region_ttm.h"
/**
* 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.
*/
/* A Zero-initialized driver for now. We don't have a TTM backend yet. */
static struct ttm_device_funcs i915_ttm_bo_driver;
/**
* 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_bo_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.
*/
static int intel_region_to_ttm_type(struct intel_memory_region *mem)
{
int type;
GEM_BUG_ON(mem->type != INTEL_MEMORY_LOCAL &&
mem->type != INTEL_MEMORY_MOCK);
type = mem->instance + TTM_PL_PRIV;
GEM_BUG_ON(type >= TTM_NUM_MEM_TYPES);
return type;
}
static struct ttm_resource *
intel_region_ttm_node_reserve(struct intel_memory_region *mem,
resource_size_t offset,
resource_size_t size)
{
struct ttm_resource_manager *man = mem->region_private;
struct ttm_place place = {};
struct ttm_buffer_object mock_bo = {};
struct ttm_resource *res;
int ret;
/*
* Having to use a mock_bo is unfortunate but stems from some
* drivers having private managers that insist to know what the
* allocate memory is intended for, using it to send private
* data to the manager. Also recently the bo has been used to send
* alignment info to the manager. Assume that apart from the latter,
* none of the managers we use will ever access the buffer object
* members, hoping we can pass the alignment info in the
* struct ttm_place in the future.
*/
place.fpfn = offset >> PAGE_SHIFT;
place.lpfn = place.fpfn + (size >> PAGE_SHIFT);
mock_bo.base.size = size;
ret = man->func->alloc(man, &mock_bo, &place, &res);
if (ret == -ENOSPC)
ret = -ENXIO;
return ret ? ERR_PTR(ret) : res;
}
/**
* intel_region_ttm_node_free - Free a node allocated from a resource manager
* @mem: The region the node was allocated from.
* @node: The opaque node representing an allocation.
*/
void intel_region_ttm_node_free(struct intel_memory_region *mem,
struct ttm_resource *res)
{
struct ttm_resource_manager *man = mem->region_private;
man->func->free(man, res);
}
static const struct intel_memory_region_private_ops priv_ops = {
.reserve = intel_region_ttm_node_reserve,
.free = intel_region_ttm_node_free,
};
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 = ttm_range_man_init(bdev, mem_type, false,
resource_size(&mem->region) >> PAGE_SHIFT);
if (ret)
return ret;
mem->chunk_size = PAGE_SIZE;
mem->max_order =
get_order(rounddown_pow_of_two(resource_size(&mem->region)));
mem->is_range_manager = true;
mem->priv_ops = &priv_ops;
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.
*/
void intel_region_ttm_fini(struct intel_memory_region *mem)
{
int ret;
ret = ttm_range_man_fini(&mem->i915->bdev,
intel_region_to_ttm_type(mem));
GEM_WARN_ON(ret);
mem->region_private = NULL;
}
/**
* intel_region_ttm_node_to_st - Convert an opaque TTM resource manager node
* to an sg_table.
* @mem: The memory region.
* @node: The resource manager node 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 sg_table *intel_region_ttm_node_to_st(struct intel_memory_region *mem,
struct ttm_resource *res)
{
struct ttm_range_mgr_node *range_node =
container_of(res, typeof(*range_node), base);
GEM_WARN_ON(!mem->is_range_manager);
return i915_sg_from_mm_node(&range_node->mm_nodes[0],
mem->region.start);
}
/**
* intel_region_ttm_node_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_node_to_st(), and can be freed using
* intel_region_ttm_node_free().
*
* Return: A valid pointer on success, an error pointer on failure.
*/
struct ttm_resource *
intel_region_ttm_node_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;
/*
* We ignore the flags for now since we're using the range
* manager and contigous and min page size would be fulfilled
* by default if size is min page size aligned.
*/
mock_bo.base.size = size;
if (mem->is_range_manager) {
if (size >= SZ_1G)
mock_bo.page_alignment = SZ_1G >> PAGE_SHIFT;
else if (size >= SZ_2M)
mock_bo.page_alignment = SZ_2M >> PAGE_SHIFT;
else if (size >= SZ_64K)
mock_bo.page_alignment = SZ_64K >> PAGE_SHIFT;
}
ret = man->func->alloc(man, &mock_bo, &place, &res);
if (ret == -ENOSPC)
ret = -ENXIO;
return ret ? ERR_PTR(ret) : res;
}
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