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path: root/drivers/gpu/drm/drm_vram_mm_helper.c
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Diffstat (limited to 'drivers/gpu/drm/drm_vram_mm_helper.c')
-rw-r--r--drivers/gpu/drm/drm_vram_mm_helper.c297
1 files changed, 0 insertions, 297 deletions
diff --git a/drivers/gpu/drm/drm_vram_mm_helper.c b/drivers/gpu/drm/drm_vram_mm_helper.c
deleted file mode 100644
index c911781d6728..000000000000
--- a/drivers/gpu/drm/drm_vram_mm_helper.c
+++ /dev/null
@@ -1,297 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-or-later
-
-#include <drm/drm_device.h>
-#include <drm/drm_file.h>
-#include <drm/drm_vram_mm_helper.h>
-
-#include <drm/ttm/ttm_page_alloc.h>
-
-/**
- * DOC: overview
- *
- * The data structure &struct drm_vram_mm and its helpers implement a memory
- * manager for simple framebuffer devices with dedicated video memory. Buffer
- * objects are either placed in video RAM or evicted to system memory. These
- * helper functions work well with &struct drm_gem_vram_object.
- */
-
-/*
- * TTM TT
- */
-
-static void backend_func_destroy(struct ttm_tt *tt)
-{
- ttm_tt_fini(tt);
- kfree(tt);
-}
-
-static struct ttm_backend_func backend_func = {
- .destroy = backend_func_destroy
-};
-
-/*
- * TTM BO device
- */
-
-static struct ttm_tt *bo_driver_ttm_tt_create(struct ttm_buffer_object *bo,
- uint32_t page_flags)
-{
- struct ttm_tt *tt;
- int ret;
-
- tt = kzalloc(sizeof(*tt), GFP_KERNEL);
- if (!tt)
- return NULL;
-
- tt->func = &backend_func;
-
- ret = ttm_tt_init(tt, bo, page_flags);
- if (ret < 0)
- goto err_ttm_tt_init;
-
- return tt;
-
-err_ttm_tt_init:
- kfree(tt);
- return NULL;
-}
-
-static int bo_driver_init_mem_type(struct ttm_bo_device *bdev, uint32_t type,
- struct ttm_mem_type_manager *man)
-{
- switch (type) {
- case TTM_PL_SYSTEM:
- man->flags = TTM_MEMTYPE_FLAG_MAPPABLE;
- man->available_caching = TTM_PL_MASK_CACHING;
- man->default_caching = TTM_PL_FLAG_CACHED;
- break;
- case TTM_PL_VRAM:
- man->func = &ttm_bo_manager_func;
- man->flags = TTM_MEMTYPE_FLAG_FIXED |
- TTM_MEMTYPE_FLAG_MAPPABLE;
- man->available_caching = TTM_PL_FLAG_UNCACHED |
- TTM_PL_FLAG_WC;
- man->default_caching = TTM_PL_FLAG_WC;
- break;
- default:
- return -EINVAL;
- }
- return 0;
-}
-
-static void bo_driver_evict_flags(struct ttm_buffer_object *bo,
- struct ttm_placement *placement)
-{
- struct drm_vram_mm *vmm = drm_vram_mm_of_bdev(bo->bdev);
-
- if (vmm->funcs && vmm->funcs->evict_flags)
- vmm->funcs->evict_flags(bo, placement);
-}
-
-static int bo_driver_verify_access(struct ttm_buffer_object *bo,
- struct file *filp)
-{
- struct drm_vram_mm *vmm = drm_vram_mm_of_bdev(bo->bdev);
-
- if (!vmm->funcs || !vmm->funcs->verify_access)
- return 0;
- return vmm->funcs->verify_access(bo, filp);
-}
-
-static int bo_driver_io_mem_reserve(struct ttm_bo_device *bdev,
- struct ttm_mem_reg *mem)
-{
- struct ttm_mem_type_manager *man = bdev->man + mem->mem_type;
- struct drm_vram_mm *vmm = drm_vram_mm_of_bdev(bdev);
-
- if (!(man->flags & TTM_MEMTYPE_FLAG_MAPPABLE))
- return -EINVAL;
-
- mem->bus.addr = NULL;
- mem->bus.size = mem->num_pages << PAGE_SHIFT;
-
- switch (mem->mem_type) {
- case TTM_PL_SYSTEM: /* nothing to do */
- mem->bus.offset = 0;
- mem->bus.base = 0;
- mem->bus.is_iomem = false;
- break;
- case TTM_PL_VRAM:
- mem->bus.offset = mem->start << PAGE_SHIFT;
- mem->bus.base = vmm->vram_base;
- mem->bus.is_iomem = true;
- break;
- default:
- return -EINVAL;
- }
-
- return 0;
-}
-
-static void bo_driver_io_mem_free(struct ttm_bo_device *bdev,
- struct ttm_mem_reg *mem)
-{ }
-
-static struct ttm_bo_driver bo_driver = {
- .ttm_tt_create = bo_driver_ttm_tt_create,
- .ttm_tt_populate = ttm_pool_populate,
- .ttm_tt_unpopulate = ttm_pool_unpopulate,
- .init_mem_type = bo_driver_init_mem_type,
- .eviction_valuable = ttm_bo_eviction_valuable,
- .evict_flags = bo_driver_evict_flags,
- .verify_access = bo_driver_verify_access,
- .io_mem_reserve = bo_driver_io_mem_reserve,
- .io_mem_free = bo_driver_io_mem_free,
-};
-
-/*
- * struct drm_vram_mm
- */
-
-/**
- * drm_vram_mm_init() - Initialize an instance of VRAM MM.
- * @vmm: the VRAM MM instance to initialize
- * @dev: the DRM device
- * @vram_base: the base address of the video memory
- * @vram_size: the size of the video memory in bytes
- * @funcs: callback functions for buffer objects
- *
- * Returns:
- * 0 on success, or
- * a negative error code otherwise.
- */
-int drm_vram_mm_init(struct drm_vram_mm *vmm, struct drm_device *dev,
- uint64_t vram_base, size_t vram_size,
- const struct drm_vram_mm_funcs *funcs)
-{
- int ret;
-
- vmm->vram_base = vram_base;
- vmm->vram_size = vram_size;
- vmm->funcs = funcs;
-
- ret = ttm_bo_device_init(&vmm->bdev, &bo_driver,
- dev->anon_inode->i_mapping,
- true);
- if (ret)
- return ret;
-
- ret = ttm_bo_init_mm(&vmm->bdev, TTM_PL_VRAM, vram_size >> PAGE_SHIFT);
- if (ret)
- return ret;
-
- return 0;
-}
-EXPORT_SYMBOL(drm_vram_mm_init);
-
-/**
- * drm_vram_mm_cleanup() - Cleans up an initialized instance of VRAM MM.
- * @vmm: the VRAM MM instance to clean up
- */
-void drm_vram_mm_cleanup(struct drm_vram_mm *vmm)
-{
- ttm_bo_device_release(&vmm->bdev);
-}
-EXPORT_SYMBOL(drm_vram_mm_cleanup);
-
-/**
- * drm_vram_mm_mmap() - Helper for implementing &struct file_operations.mmap()
- * @filp: the mapping's file structure
- * @vma: the mapping's memory area
- * @vmm: the VRAM MM instance
- *
- * Returns:
- * 0 on success, or
- * a negative error code otherwise.
- */
-int drm_vram_mm_mmap(struct file *filp, struct vm_area_struct *vma,
- struct drm_vram_mm *vmm)
-{
- return ttm_bo_mmap(filp, vma, &vmm->bdev);
-}
-EXPORT_SYMBOL(drm_vram_mm_mmap);
-
-/*
- * Helpers for integration with struct drm_device
- */
-
-/**
- * drm_vram_helper_alloc_mm - Allocates a device's instance of \
- &struct drm_vram_mm
- * @dev: the DRM device
- * @vram_base: the base address of the video memory
- * @vram_size: the size of the video memory in bytes
- * @funcs: callback functions for buffer objects
- *
- * Returns:
- * The new instance of &struct drm_vram_mm on success, or
- * an ERR_PTR()-encoded errno code otherwise.
- */
-struct drm_vram_mm *drm_vram_helper_alloc_mm(
- struct drm_device *dev, uint64_t vram_base, size_t vram_size,
- const struct drm_vram_mm_funcs *funcs)
-{
- int ret;
-
- if (WARN_ON(dev->vram_mm))
- return dev->vram_mm;
-
- dev->vram_mm = kzalloc(sizeof(*dev->vram_mm), GFP_KERNEL);
- if (!dev->vram_mm)
- return ERR_PTR(-ENOMEM);
-
- ret = drm_vram_mm_init(dev->vram_mm, dev, vram_base, vram_size, funcs);
- if (ret)
- goto err_kfree;
-
- return dev->vram_mm;
-
-err_kfree:
- kfree(dev->vram_mm);
- dev->vram_mm = NULL;
- return ERR_PTR(ret);
-}
-EXPORT_SYMBOL(drm_vram_helper_alloc_mm);
-
-/**
- * drm_vram_helper_release_mm - Releases a device's instance of \
- &struct drm_vram_mm
- * @dev: the DRM device
- */
-void drm_vram_helper_release_mm(struct drm_device *dev)
-{
- if (!dev->vram_mm)
- return;
-
- drm_vram_mm_cleanup(dev->vram_mm);
- kfree(dev->vram_mm);
- dev->vram_mm = NULL;
-}
-EXPORT_SYMBOL(drm_vram_helper_release_mm);
-
-/*
- * Helpers for &struct file_operations
- */
-
-/**
- * drm_vram_mm_file_operations_mmap() - \
- Implements &struct file_operations.mmap()
- * @filp: the mapping's file structure
- * @vma: the mapping's memory area
- *
- * Returns:
- * 0 on success, or
- * a negative error code otherwise.
- */
-int drm_vram_mm_file_operations_mmap(
- struct file *filp, struct vm_area_struct *vma)
-{
- struct drm_file *file_priv = filp->private_data;
- struct drm_device *dev = file_priv->minor->dev;
-
- if (WARN_ONCE(!dev->vram_mm, "VRAM MM not initialized"))
- return -EINVAL;
-
- return drm_vram_mm_mmap(filp, vma, dev->vram_mm);
-}
-EXPORT_SYMBOL(drm_vram_mm_file_operations_mmap);
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.