// SPDX-License-Identifier: GPL-2.0 or MIT /* Copyright 2019 Linaro, Ltd, Rob Herring */ /* Copyright 2023 Collabora ltd. */ #include #include #include #include #include #include "panthor_device.h" #include "panthor_gem.h" #include "panthor_mmu.h" static void panthor_gem_free_object(struct drm_gem_object *obj) { struct panthor_gem_object *bo = to_panthor_bo(obj); struct drm_gem_object *vm_root_gem = bo->exclusive_vm_root_gem; drm_gem_free_mmap_offset(&bo->base.base); mutex_destroy(&bo->gpuva_list_lock); drm_gem_shmem_free(&bo->base); drm_gem_object_put(vm_root_gem); } /** * panthor_kernel_bo_destroy() - Destroy a kernel buffer object * @bo: Kernel buffer object to destroy. If NULL or an ERR_PTR(), the destruction * is skipped. */ void panthor_kernel_bo_destroy(struct panthor_kernel_bo *bo) { struct panthor_vm *vm; int ret; if (IS_ERR_OR_NULL(bo)) return; vm = bo->vm; panthor_kernel_bo_vunmap(bo); if (drm_WARN_ON(bo->obj->dev, to_panthor_bo(bo->obj)->exclusive_vm_root_gem != panthor_vm_root_gem(vm))) goto out_free_bo; ret = panthor_vm_unmap_range(vm, bo->va_node.start, panthor_kernel_bo_size(bo)); if (ret) goto out_free_bo; panthor_vm_free_va(vm, &bo->va_node); drm_gem_object_put(bo->obj); out_free_bo: panthor_vm_put(vm); kfree(bo); } /** * panthor_kernel_bo_create() - Create and map a GEM object to a VM * @ptdev: Device. * @vm: VM to map the GEM to. If NULL, the kernel object is not GPU mapped. * @size: Size of the buffer object. * @bo_flags: Combination of drm_panthor_bo_flags flags. * @vm_map_flags: Combination of drm_panthor_vm_bind_op_flags (only those * that are related to map operations). * @gpu_va: GPU address assigned when mapping to the VM. * If gpu_va == PANTHOR_VM_KERNEL_AUTO_VA, the virtual address will be * automatically allocated. * * Return: A valid pointer in case of success, an ERR_PTR() otherwise. */ struct panthor_kernel_bo * panthor_kernel_bo_create(struct panthor_device *ptdev, struct panthor_vm *vm, size_t size, u32 bo_flags, u32 vm_map_flags, u64 gpu_va) { struct drm_gem_shmem_object *obj; struct panthor_kernel_bo *kbo; struct panthor_gem_object *bo; int ret; if (drm_WARN_ON(&ptdev->base, !vm)) return ERR_PTR(-EINVAL); kbo = kzalloc(sizeof(*kbo), GFP_KERNEL); if (!kbo) return ERR_PTR(-ENOMEM); obj = drm_gem_shmem_create(&ptdev->base, size); if (IS_ERR(obj)) { ret = PTR_ERR(obj); goto err_free_bo; } bo = to_panthor_bo(&obj->base); size = obj->base.size; kbo->obj = &obj->base; bo->flags = bo_flags; ret = panthor_vm_alloc_va(vm, gpu_va, size, &kbo->va_node); if (ret) goto err_put_obj; ret = panthor_vm_map_bo_range(vm, bo, 0, size, kbo->va_node.start, vm_map_flags); if (ret) goto err_free_va; kbo->vm = panthor_vm_get(vm); bo->exclusive_vm_root_gem = panthor_vm_root_gem(vm); drm_gem_object_get(bo->exclusive_vm_root_gem); bo->base.base.resv = bo->exclusive_vm_root_gem->resv; return kbo; err_free_va: panthor_vm_free_va(vm, &kbo->va_node); err_put_obj: drm_gem_object_put(&obj->base); err_free_bo: kfree(kbo); return ERR_PTR(ret); } static int panthor_gem_mmap(struct drm_gem_object *obj, struct vm_area_struct *vma) { struct panthor_gem_object *bo = to_panthor_bo(obj); /* Don't allow mmap on objects that have the NO_MMAP flag set. */ if (bo->flags & DRM_PANTHOR_BO_NO_MMAP) return -EINVAL; return drm_gem_shmem_object_mmap(obj, vma); } static struct dma_buf * panthor_gem_prime_export(struct drm_gem_object *obj, int flags) { /* We can't export GEMs that have an exclusive VM. */ if (to_panthor_bo(obj)->exclusive_vm_root_gem) return ERR_PTR(-EINVAL); return drm_gem_prime_export(obj, flags); } static const struct drm_gem_object_funcs panthor_gem_funcs = { .free = panthor_gem_free_object, .print_info = drm_gem_shmem_object_print_info, .pin = drm_gem_shmem_object_pin, .unpin = drm_gem_shmem_object_unpin, .get_sg_table = drm_gem_shmem_object_get_sg_table, .vmap = drm_gem_shmem_object_vmap, .vunmap = drm_gem_shmem_object_vunmap, .mmap = panthor_gem_mmap, .export = panthor_gem_prime_export, .vm_ops = &drm_gem_shmem_vm_ops, }; /** * panthor_gem_create_object - Implementation of driver->gem_create_object. * @ddev: DRM device * @size: Size in bytes of the memory the object will reference * * This lets the GEM helpers allocate object structs for us, and keep * our BO stats correct. */ struct drm_gem_object *panthor_gem_create_object(struct drm_device *ddev, size_t size) { struct panthor_device *ptdev = container_of(ddev, struct panthor_device, base); struct panthor_gem_object *obj; obj = kzalloc(sizeof(*obj), GFP_KERNEL); if (!obj) return ERR_PTR(-ENOMEM); obj->base.base.funcs = &panthor_gem_funcs; obj->base.map_wc = !ptdev->coherent; mutex_init(&obj->gpuva_list_lock); drm_gem_gpuva_set_lock(&obj->base.base, &obj->gpuva_list_lock); return &obj->base.base; } /** * panthor_gem_create_with_handle() - Create a GEM object and attach it to a handle. * @file: DRM file. * @ddev: DRM device. * @exclusive_vm: Exclusive VM. Not NULL if the GEM object can't be shared. * @size: Size of the GEM object to allocate. * @flags: Combination of drm_panthor_bo_flags flags. * @handle: Pointer holding the handle pointing to the new GEM object. * * Return: Zero on success */ int panthor_gem_create_with_handle(struct drm_file *file, struct drm_device *ddev, struct panthor_vm *exclusive_vm, u64 *size, u32 flags, u32 *handle) { int ret; struct drm_gem_shmem_object *shmem; struct panthor_gem_object *bo; shmem = drm_gem_shmem_create(ddev, *size); if (IS_ERR(shmem)) return PTR_ERR(shmem); bo = to_panthor_bo(&shmem->base); bo->flags = flags; if (exclusive_vm) { bo->exclusive_vm_root_gem = panthor_vm_root_gem(exclusive_vm); drm_gem_object_get(bo->exclusive_vm_root_gem); bo->base.base.resv = bo->exclusive_vm_root_gem->resv; } /* * Allocate an id of idr table where the obj is registered * and handle has the id what user can see. */ ret = drm_gem_handle_create(file, &shmem->base, handle); if (!ret) *size = bo->base.base.size; /* drop reference from allocate - handle holds it now. */ drm_gem_object_put(&shmem->base); return ret; }