diff options
Diffstat (limited to 'drivers/gpu/drm/panthor/panthor_gem.c')
| -rw-r--r-- | drivers/gpu/drm/panthor/panthor_gem.c | 230 |
1 files changed, 230 insertions, 0 deletions
diff --git a/drivers/gpu/drm/panthor/panthor_gem.c b/drivers/gpu/drm/panthor/panthor_gem.c new file mode 100644 index 000000000000..d6483266d0c2 --- /dev/null +++ b/drivers/gpu/drm/panthor/panthor_gem.c @@ -0,0 +1,230 @@ +// SPDX-License-Identifier: GPL-2.0 or MIT +/* Copyright 2019 Linaro, Ltd, Rob Herring <robh@kernel.org> */ +/* Copyright 2023 Collabora ltd. */ + +#include <linux/dma-buf.h> +#include <linux/dma-mapping.h> +#include <linux/err.h> +#include <linux/slab.h> + +#include <drm/panthor_drm.h> + +#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 + * @vm: The VM this BO was mapped to. + * @bo: Kernel buffer object to destroy. If NULL or an ERR_PTR(), the destruction + * is skipped. + */ +void panthor_kernel_bo_destroy(struct panthor_vm *vm, + struct panthor_kernel_bo *bo) +{ + int ret; + + if (IS_ERR_OR_NULL(bo)) + return; + + 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: + 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; + + 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; +} |