| /* |
| * Copyright (C) 2015 Red Hat, Inc. |
| * All Rights Reserved. |
| * |
| * Authors: |
| * Dave Airlie |
| * Alon Levy |
| * |
| * Permission is hereby granted, free of charge, to any person obtaining a |
| * copy of this software and associated documentation files (the "Software"), |
| * to deal in the Software without restriction, including without limitation |
| * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
| * and/or sell copies of the Software, and to permit persons to whom the |
| * Software is furnished to do so, subject to the following conditions: |
| * |
| * The above copyright notice and this permission notice shall be included in |
| * all copies or substantial portions of the Software. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR |
| * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, |
| * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR |
| * OTHER DEALINGS IN THE SOFTWARE. |
| */ |
| |
| #include <ttm/ttm_bo_api.h> |
| #include <ttm/ttm_bo_driver.h> |
| #include <ttm/ttm_placement.h> |
| #include <ttm/ttm_page_alloc.h> |
| #include <ttm/ttm_module.h> |
| #include <drm/drmP.h> |
| #include <drm/drm.h> |
| #include <drm/virtgpu_drm.h> |
| #include "virtgpu_drv.h" |
| |
| #include <linux/delay.h> |
| |
| #define DRM_FILE_PAGE_OFFSET (0x100000000ULL >> PAGE_SHIFT) |
| |
| static struct |
| virtio_gpu_device *virtio_gpu_get_vgdev(struct ttm_bo_device *bdev) |
| { |
| struct virtio_gpu_mman *mman; |
| struct virtio_gpu_device *vgdev; |
| |
| mman = container_of(bdev, struct virtio_gpu_mman, bdev); |
| vgdev = container_of(mman, struct virtio_gpu_device, mman); |
| return vgdev; |
| } |
| |
| static int virtio_gpu_ttm_mem_global_init(struct drm_global_reference *ref) |
| { |
| return ttm_mem_global_init(ref->object); |
| } |
| |
| static void virtio_gpu_ttm_mem_global_release(struct drm_global_reference *ref) |
| { |
| ttm_mem_global_release(ref->object); |
| } |
| |
| static int virtio_gpu_ttm_global_init(struct virtio_gpu_device *vgdev) |
| { |
| struct drm_global_reference *global_ref; |
| int r; |
| |
| vgdev->mman.mem_global_referenced = false; |
| global_ref = &vgdev->mman.mem_global_ref; |
| global_ref->global_type = DRM_GLOBAL_TTM_MEM; |
| global_ref->size = sizeof(struct ttm_mem_global); |
| global_ref->init = &virtio_gpu_ttm_mem_global_init; |
| global_ref->release = &virtio_gpu_ttm_mem_global_release; |
| |
| r = drm_global_item_ref(global_ref); |
| if (r != 0) { |
| DRM_ERROR("Failed setting up TTM memory accounting " |
| "subsystem.\n"); |
| return r; |
| } |
| |
| vgdev->mman.bo_global_ref.mem_glob = |
| vgdev->mman.mem_global_ref.object; |
| global_ref = &vgdev->mman.bo_global_ref.ref; |
| global_ref->global_type = DRM_GLOBAL_TTM_BO; |
| global_ref->size = sizeof(struct ttm_bo_global); |
| global_ref->init = &ttm_bo_global_init; |
| global_ref->release = &ttm_bo_global_release; |
| r = drm_global_item_ref(global_ref); |
| if (r != 0) { |
| DRM_ERROR("Failed setting up TTM BO subsystem.\n"); |
| drm_global_item_unref(&vgdev->mman.mem_global_ref); |
| return r; |
| } |
| |
| vgdev->mman.mem_global_referenced = true; |
| return 0; |
| } |
| |
| static void virtio_gpu_ttm_global_fini(struct virtio_gpu_device *vgdev) |
| { |
| if (vgdev->mman.mem_global_referenced) { |
| drm_global_item_unref(&vgdev->mman.bo_global_ref.ref); |
| drm_global_item_unref(&vgdev->mman.mem_global_ref); |
| vgdev->mman.mem_global_referenced = false; |
| } |
| } |
| |
| #if 0 |
| /* |
| * Hmm, seems to not do anything useful. Leftover debug hack? |
| * Something like printing pagefaults to kernel log? |
| */ |
| static struct vm_operations_struct virtio_gpu_ttm_vm_ops; |
| static const struct vm_operations_struct *ttm_vm_ops; |
| |
| static int virtio_gpu_ttm_fault(struct vm_area_struct *vma, |
| struct vm_fault *vmf) |
| { |
| struct ttm_buffer_object *bo; |
| struct virtio_gpu_device *vgdev; |
| int r; |
| |
| bo = (struct ttm_buffer_object *)vma->vm_private_data; |
| if (bo == NULL) |
| return VM_FAULT_NOPAGE; |
| vgdev = virtio_gpu_get_vgdev(bo->bdev); |
| r = ttm_vm_ops->fault(vma, vmf); |
| return r; |
| } |
| #endif |
| |
| int virtio_gpu_mmap(struct file *filp, struct vm_area_struct *vma) |
| { |
| struct drm_file *file_priv; |
| struct virtio_gpu_device *vgdev; |
| int r; |
| |
| file_priv = filp->private_data; |
| vgdev = file_priv->minor->dev->dev_private; |
| if (vgdev == NULL) { |
| DRM_ERROR( |
| "filp->private_data->minor->dev->dev_private == NULL\n"); |
| return -EINVAL; |
| } |
| r = ttm_bo_mmap(filp, vma, &vgdev->mman.bdev); |
| #if 0 |
| if (unlikely(r != 0)) |
| return r; |
| if (unlikely(ttm_vm_ops == NULL)) { |
| ttm_vm_ops = vma->vm_ops; |
| virtio_gpu_ttm_vm_ops = *ttm_vm_ops; |
| virtio_gpu_ttm_vm_ops.fault = &virtio_gpu_ttm_fault; |
| } |
| vma->vm_ops = &virtio_gpu_ttm_vm_ops; |
| return 0; |
| #else |
| return r; |
| #endif |
| } |
| |
| static int virtio_gpu_invalidate_caches(struct ttm_bo_device *bdev, |
| uint32_t flags) |
| { |
| return 0; |
| } |
| |
| static int ttm_bo_man_get_node(struct ttm_mem_type_manager *man, |
| struct ttm_buffer_object *bo, |
| const struct ttm_place *place, |
| struct ttm_mem_reg *mem) |
| { |
| mem->mm_node = (void *)1; |
| return 0; |
| } |
| |
| static void ttm_bo_man_put_node(struct ttm_mem_type_manager *man, |
| struct ttm_mem_reg *mem) |
| { |
| mem->mm_node = (void *)NULL; |
| return; |
| } |
| |
| static int ttm_bo_man_init(struct ttm_mem_type_manager *man, |
| unsigned long p_size) |
| { |
| return 0; |
| } |
| |
| static int ttm_bo_man_takedown(struct ttm_mem_type_manager *man) |
| { |
| return 0; |
| } |
| |
| static void ttm_bo_man_debug(struct ttm_mem_type_manager *man, |
| const char *prefix) |
| { |
| } |
| |
| static const struct ttm_mem_type_manager_func virtio_gpu_bo_manager_func = { |
| ttm_bo_man_init, |
| ttm_bo_man_takedown, |
| ttm_bo_man_get_node, |
| ttm_bo_man_put_node, |
| ttm_bo_man_debug |
| }; |
| |
| static int virtio_gpu_init_mem_type(struct ttm_bo_device *bdev, uint32_t type, |
| struct ttm_mem_type_manager *man) |
| { |
| struct virtio_gpu_device *vgdev; |
| |
| vgdev = virtio_gpu_get_vgdev(bdev); |
| |
| switch (type) { |
| case TTM_PL_SYSTEM: |
| /* System memory */ |
| man->flags = TTM_MEMTYPE_FLAG_MAPPABLE; |
| man->available_caching = TTM_PL_MASK_CACHING; |
| man->default_caching = TTM_PL_FLAG_CACHED; |
| break; |
| case TTM_PL_TT: |
| man->func = &virtio_gpu_bo_manager_func; |
| man->flags = TTM_MEMTYPE_FLAG_MAPPABLE; |
| man->available_caching = TTM_PL_MASK_CACHING; |
| man->default_caching = TTM_PL_FLAG_CACHED; |
| break; |
| default: |
| DRM_ERROR("Unsupported memory type %u\n", (unsigned)type); |
| return -EINVAL; |
| } |
| return 0; |
| } |
| |
| static void virtio_gpu_evict_flags(struct ttm_buffer_object *bo, |
| struct ttm_placement *placement) |
| { |
| static struct ttm_place placements = { |
| .fpfn = 0, |
| .lpfn = 0, |
| .flags = TTM_PL_MASK_CACHING | TTM_PL_FLAG_SYSTEM, |
| }; |
| |
| placement->placement = &placements; |
| placement->busy_placement = &placements; |
| placement->num_placement = 1; |
| placement->num_busy_placement = 1; |
| return; |
| } |
| |
| static int virtio_gpu_verify_access(struct ttm_buffer_object *bo, |
| struct file *filp) |
| { |
| return 0; |
| } |
| |
| static int virtio_gpu_ttm_io_mem_reserve(struct ttm_bo_device *bdev, |
| struct ttm_mem_reg *mem) |
| { |
| struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type]; |
| |
| mem->bus.addr = NULL; |
| mem->bus.offset = 0; |
| mem->bus.size = mem->num_pages << PAGE_SHIFT; |
| mem->bus.base = 0; |
| mem->bus.is_iomem = false; |
| if (!(man->flags & TTM_MEMTYPE_FLAG_MAPPABLE)) |
| return -EINVAL; |
| switch (mem->mem_type) { |
| case TTM_PL_SYSTEM: |
| case TTM_PL_TT: |
| /* system memory */ |
| return 0; |
| default: |
| return -EINVAL; |
| } |
| return 0; |
| } |
| |
| static void virtio_gpu_ttm_io_mem_free(struct ttm_bo_device *bdev, |
| struct ttm_mem_reg *mem) |
| { |
| } |
| |
| /* |
| * TTM backend functions. |
| */ |
| struct virtio_gpu_ttm_tt { |
| struct ttm_dma_tt ttm; |
| struct virtio_gpu_device *vgdev; |
| u64 offset; |
| }; |
| |
| static int virtio_gpu_ttm_backend_bind(struct ttm_tt *ttm, |
| struct ttm_mem_reg *bo_mem) |
| { |
| struct virtio_gpu_ttm_tt *gtt = (void *)ttm; |
| |
| gtt->offset = (unsigned long)(bo_mem->start << PAGE_SHIFT); |
| if (!ttm->num_pages) |
| WARN(1, "nothing to bind %lu pages for mreg %p back %p!\n", |
| ttm->num_pages, bo_mem, ttm); |
| |
| /* Not implemented */ |
| return 0; |
| } |
| |
| static int virtio_gpu_ttm_backend_unbind(struct ttm_tt *ttm) |
| { |
| /* Not implemented */ |
| return 0; |
| } |
| |
| static void virtio_gpu_ttm_backend_destroy(struct ttm_tt *ttm) |
| { |
| struct virtio_gpu_ttm_tt *gtt = (void *)ttm; |
| |
| ttm_dma_tt_fini(>t->ttm); |
| kfree(gtt); |
| } |
| |
| static struct ttm_backend_func virtio_gpu_backend_func = { |
| .bind = &virtio_gpu_ttm_backend_bind, |
| .unbind = &virtio_gpu_ttm_backend_unbind, |
| .destroy = &virtio_gpu_ttm_backend_destroy, |
| }; |
| |
| static int virtio_gpu_ttm_tt_populate(struct ttm_tt *ttm) |
| { |
| if (ttm->state != tt_unpopulated) |
| return 0; |
| |
| return ttm_pool_populate(ttm); |
| } |
| |
| static void virtio_gpu_ttm_tt_unpopulate(struct ttm_tt *ttm) |
| { |
| ttm_pool_unpopulate(ttm); |
| } |
| |
| static struct ttm_tt *virtio_gpu_ttm_tt_create(struct ttm_bo_device *bdev, |
| unsigned long size, |
| uint32_t page_flags, |
| struct page *dummy_read_page) |
| { |
| struct virtio_gpu_device *vgdev; |
| struct virtio_gpu_ttm_tt *gtt; |
| |
| vgdev = virtio_gpu_get_vgdev(bdev); |
| gtt = kzalloc(sizeof(struct virtio_gpu_ttm_tt), GFP_KERNEL); |
| if (gtt == NULL) |
| return NULL; |
| gtt->ttm.ttm.func = &virtio_gpu_backend_func; |
| gtt->vgdev = vgdev; |
| if (ttm_dma_tt_init(>t->ttm, bdev, size, page_flags, |
| dummy_read_page)) { |
| kfree(gtt); |
| return NULL; |
| } |
| return >t->ttm.ttm; |
| } |
| |
| static void virtio_gpu_move_null(struct ttm_buffer_object *bo, |
| struct ttm_mem_reg *new_mem) |
| { |
| struct ttm_mem_reg *old_mem = &bo->mem; |
| |
| BUG_ON(old_mem->mm_node != NULL); |
| *old_mem = *new_mem; |
| new_mem->mm_node = NULL; |
| } |
| |
| static int virtio_gpu_bo_move(struct ttm_buffer_object *bo, |
| bool evict, bool interruptible, |
| bool no_wait_gpu, |
| struct ttm_mem_reg *new_mem) |
| { |
| virtio_gpu_move_null(bo, new_mem); |
| return 0; |
| } |
| |
| static void virtio_gpu_bo_move_notify(struct ttm_buffer_object *tbo, |
| struct ttm_mem_reg *new_mem) |
| { |
| struct virtio_gpu_object *bo; |
| struct virtio_gpu_device *vgdev; |
| |
| bo = container_of(tbo, struct virtio_gpu_object, tbo); |
| vgdev = (struct virtio_gpu_device *)bo->gem_base.dev->dev_private; |
| |
| if (!new_mem || (new_mem->placement & TTM_PL_FLAG_SYSTEM)) { |
| if (bo->hw_res_handle) |
| virtio_gpu_cmd_resource_inval_backing(vgdev, |
| bo->hw_res_handle); |
| |
| } else if (new_mem->placement & TTM_PL_FLAG_TT) { |
| if (bo->hw_res_handle) { |
| virtio_gpu_object_attach(vgdev, bo, bo->hw_res_handle, |
| NULL); |
| } |
| } |
| } |
| |
| static void virtio_gpu_bo_swap_notify(struct ttm_buffer_object *tbo) |
| { |
| struct virtio_gpu_object *bo; |
| struct virtio_gpu_device *vgdev; |
| |
| bo = container_of(tbo, struct virtio_gpu_object, tbo); |
| vgdev = (struct virtio_gpu_device *)bo->gem_base.dev->dev_private; |
| |
| if (bo->pages) |
| virtio_gpu_object_free_sg_table(bo); |
| } |
| |
| static struct ttm_bo_driver virtio_gpu_bo_driver = { |
| .ttm_tt_create = &virtio_gpu_ttm_tt_create, |
| .ttm_tt_populate = &virtio_gpu_ttm_tt_populate, |
| .ttm_tt_unpopulate = &virtio_gpu_ttm_tt_unpopulate, |
| .invalidate_caches = &virtio_gpu_invalidate_caches, |
| .init_mem_type = &virtio_gpu_init_mem_type, |
| .evict_flags = &virtio_gpu_evict_flags, |
| .move = &virtio_gpu_bo_move, |
| .verify_access = &virtio_gpu_verify_access, |
| .io_mem_reserve = &virtio_gpu_ttm_io_mem_reserve, |
| .io_mem_free = &virtio_gpu_ttm_io_mem_free, |
| .move_notify = &virtio_gpu_bo_move_notify, |
| .swap_notify = &virtio_gpu_bo_swap_notify, |
| }; |
| |
| int virtio_gpu_ttm_init(struct virtio_gpu_device *vgdev) |
| { |
| int r; |
| |
| r = virtio_gpu_ttm_global_init(vgdev); |
| if (r) |
| return r; |
| /* No others user of address space so set it to 0 */ |
| r = ttm_bo_device_init(&vgdev->mman.bdev, |
| vgdev->mman.bo_global_ref.ref.object, |
| &virtio_gpu_bo_driver, |
| vgdev->ddev->anon_inode->i_mapping, |
| DRM_FILE_PAGE_OFFSET, 0); |
| if (r) { |
| DRM_ERROR("failed initializing buffer object driver(%d).\n", r); |
| goto err_dev_init; |
| } |
| |
| r = ttm_bo_init_mm(&vgdev->mman.bdev, TTM_PL_TT, 0); |
| if (r) { |
| DRM_ERROR("Failed initializing GTT heap.\n"); |
| goto err_mm_init; |
| } |
| return 0; |
| |
| err_mm_init: |
| ttm_bo_device_release(&vgdev->mman.bdev); |
| err_dev_init: |
| virtio_gpu_ttm_global_fini(vgdev); |
| return r; |
| } |
| |
| void virtio_gpu_ttm_fini(struct virtio_gpu_device *vgdev) |
| { |
| ttm_bo_device_release(&vgdev->mman.bdev); |
| virtio_gpu_ttm_global_fini(vgdev); |
| DRM_INFO("virtio_gpu: ttm finalized\n"); |
| } |