mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-23 09:19:51 +00:00
![Matthew Auld](/assets/img/avatar_default.png)
For some specialised objects we might need something larger than the regions min_page_size due to some hw restriction, and slightly more hairy is needing something smaller with the guarantee that such objects will never be inserted into any GTT, which is the case for the paging structures. This also fixes how we setup the BO page_alignment, if we later migrate the object somewhere else. For example if the placements are {SMEM, LMEM}, then we might get this wrong. Pushing the min_page_size behaviour into the manager should fix this. v2(Thomas): push the default page size behaviour into buddy_man, and let the user override it with the page-alignment, which looks cleaner v3: rebase on ttm sys changes Signed-off-by: Matthew Auld <matthew.auld@intel.com> Cc: Thomas Hellström <thomas.hellstrom@linux.intel.com> Reviewed-by: Thomas Hellström <thomas.hellstrom@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20210625103824.558481-1-matthew.auld@intel.com
192 lines
5.5 KiB
C
192 lines
5.5 KiB
C
// 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.
|
|
*/
|
|
void intel_region_ttm_fini(struct intel_memory_region *mem)
|
|
{
|
|
int ret;
|
|
|
|
ret = i915_ttm_buddy_man_fini(&mem->i915->bdev,
|
|
intel_region_to_ttm_type(mem));
|
|
GEM_WARN_ON(ret);
|
|
mem->region_private = NULL;
|
|
}
|
|
|
|
/**
|
|
* intel_region_ttm_resource_to_st - Convert an opaque TTM resource manager resource
|
|
* to an 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 sg_table *intel_region_ttm_resource_to_st(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_sg_from_mm_node(&range_node->mm_nodes[0],
|
|
mem->region.start);
|
|
} else {
|
|
return i915_sg_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);
|
|
}
|