// SPDX-License-Identifier: GPL-2.0 or MIT
/* Copyright 2019 Linaro, Ltd, Rob Herring <[email protected]> */
/* 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
* @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;
}
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