linux/drivers/gpu/drm/panthor/panthor_gem.c

// 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)
{ … }

/**
 * 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)
{ … }

/**
 * 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)
{ … }

static int panthor_gem_mmap(struct drm_gem_object *obj, struct vm_area_struct *vma)
{ … }

static struct dma_buf *
panthor_gem_prime_export(struct drm_gem_object *obj, int flags)
{ … }

static const struct drm_gem_object_funcs panthor_gem_funcs = …;

/**
 * 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)
{ … }

/**
 * 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)
{ … }