diff options
Diffstat (limited to 'drivers/gpu/drm/i915/intel_region_ttm.c')
| -rw-r--r-- | drivers/gpu/drm/i915/intel_region_ttm.c | 220 |
1 files changed, 220 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/intel_region_ttm.c b/drivers/gpu/drm/i915/intel_region_ttm.c new file mode 100644 index 000000000000..c8ac118c21f6 --- /dev/null +++ b/drivers/gpu/drm/i915/intel_region_ttm.c @@ -0,0 +1,220 @@ +// SPDX-License-Identifier: MIT +/* + * Copyright © 2021 Intel Corporation + */ +#include <drm/ttm/ttm_bo_driver.h> +#include <drm/ttm/ttm_device.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 void *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_resource res = {}; + struct ttm_buffer_object mock_bo = {}; + 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); + res.num_pages = size >> PAGE_SHIFT; + ret = man->func->alloc(man, &mock_bo, &place, &res); + if (ret == -ENOSPC) + ret = -ENXIO; + + return ret ? ERR_PTR(ret) : res.mm_node; +} + +/** + * 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, + void *node) +{ + struct ttm_resource_manager *man = mem->region_private; + struct ttm_resource res = {}; + + res.mm_node = node; + 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, + void *node) +{ + return i915_sg_from_mm_node(node, 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. + */ +void *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_resource res = {}; + struct ttm_buffer_object mock_bo = {}; + 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. + */ + res.num_pages = size >> PAGE_SHIFT; + + 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.mm_node; +} |