path: root/drivers/gpu/drm/imagination/pvr_drv.c

// SPDX-License-Identifier: GPL-2.0-only OR MIT
/* Copyright (c) 2023 Imagination Technologies Ltd. */

#include "pvr_device.h"
#include "pvr_drv.h"
#include "pvr_gem.h"
#include "pvr_mmu.h"
#include "pvr_rogue_defs.h"
#include "pvr_rogue_fwif_client.h"
#include "pvr_rogue_fwif_shared.h"
#include "pvr_vm.h"

#include <uapi/drm/pvr_drm.h>

#include <drm/drm_device.h>
#include <drm/drm_drv.h>
#include <drm/drm_file.h>
#include <drm/drm_gem.h>
#include <drm/drm_ioctl.h>

#include <linux/err.h>
#include <linux/export.h>
#include <linux/fs.h>
#include <linux/kernel.h>
#include <linux/mod_devicetable.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/of_device.h>
#include <linux/of_platform.h>
#include <linux/platform_device.h>

/**
 * DOC: PowerVR (Series 6 and later) and IMG Graphics Driver
 *
 * This driver supports the following PowerVR/IMG graphics cores from Imagination Technologies:
 *
 * * AXE-1-16M (found in Texas Instruments AM62)
 */

/**
 * pvr_ioctl_create_bo() - IOCTL to create a GEM buffer object.
 * @drm_dev: [IN] Target DRM device.
 * @raw_args: [IN/OUT] Arguments passed to this IOCTL. This must be of type
 * &struct drm_pvr_ioctl_create_bo_args.
 * @file: [IN] DRM file-private data.
 *
 * Called from userspace with %DRM_IOCTL_PVR_CREATE_BO.
 *
 * Return:
 *  * 0 on success,
 *  * -%EINVAL if the value of &drm_pvr_ioctl_create_bo_args.size is zero
 *    or wider than &typedef size_t,
 *  * -%EINVAL if any bits in &drm_pvr_ioctl_create_bo_args.flags that are
 *    reserved or undefined are set,
 *  * -%EINVAL if any padding fields in &drm_pvr_ioctl_create_bo_args are not
 *    zero,
 *  * Any error encountered while creating the object (see
 *    pvr_gem_object_create()), or
 *  * Any error encountered while transferring ownership of the object into a
 *    userspace-accessible handle (see pvr_gem_object_into_handle()).
 */
static int
pvr_ioctl_create_bo(struct drm_device *drm_dev, void *raw_args,
		    struct drm_file *file)
{
	struct drm_pvr_ioctl_create_bo_args *args = raw_args;
	struct pvr_device *pvr_dev = to_pvr_device(drm_dev);
	struct pvr_file *pvr_file = to_pvr_file(file);

	struct pvr_gem_object *pvr_obj;
	size_t sanitized_size;

	int idx;
	int err;

	if (!drm_dev_enter(drm_dev, &idx))
		return -EIO;

	/* All padding fields must be zeroed. */
	if (args->_padding_c != 0) {
		err = -EINVAL;
		goto err_drm_dev_exit;
	}

	/*
	 * On 64-bit platforms (our primary target), size_t is a u64. However,
	 * on other architectures we have to check for overflow when casting
	 * down to size_t from u64.
	 *
	 * We also disallow zero-sized allocations, and reserved (kernel-only)
	 * flags.
	 */
	if (args->size > SIZE_MAX || args->size == 0 || args->flags &
	    ~DRM_PVR_BO_FLAGS_MASK || args->size & (PVR_DEVICE_PAGE_SIZE - 1)) {
		err = -EINVAL;
		goto err_drm_dev_exit;
	}

	sanitized_size = (size_t)args->size;

	/*
	 * Create a buffer object and transfer ownership to a userspace-
	 * accessible handle.
	 */
	pvr_obj = pvr_gem_object_create(pvr_dev, sanitized_size, args->flags);
	if (IS_ERR(pvr_obj)) {
		err = PTR_ERR(pvr_obj);
		goto err_drm_dev_exit;
	}

	/* This function will not modify &args->handle unless it succeeds. */
	err = pvr_gem_object_into_handle(pvr_obj, pvr_file, &args->handle);
	if (