drm.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (C) 2012 Avionic Design GmbH
 * Copyright (C) 2012-2016 NVIDIA CORPORATION.  All rights reserved.
 */

#include <linux/bitops.h>
#include <linux/host1x.h>
#include <linux/idr.h>
#include <linux/iommu.h>
#include <linux/module.h>
#include <linux/platform_device.h>

#include <drm/drm_aperture.h>
#include <drm/drm_atomic.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_debugfs.h>
#include <drm/drm_drv.h>
#include <drm/drm_fourcc.h>
#include <drm/drm_ioctl.h>
#include <drm/drm_prime.h>
#include <drm/drm_vblank.h>

#include "drm.h"
#include "gem.h"

#define DRIVER_NAME "tegra"
#define DRIVER_DESC "NVIDIA Tegra graphics"
#define DRIVER_DATE "20120330"
#define DRIVER_MAJOR 0
#define DRIVER_MINOR 0
#define DRIVER_PATCHLEVEL 0

#define CARVEOUT_SZ SZ_64M
#define CDMA_GATHER_FETCHES_MAX_NB 16383

struct tegra_drm_file {
	struct idr contexts;
	struct mutex lock;
};

static int tegra_atomic_check(struct drm_device *drm,
			      struct drm_atomic_state *state)
{
	int err;

	err = drm_atomic_helper_check(drm, state);
	if (err < 0)
		return err;

	return tegra_display_hub_atomic_check(drm, state);
}

static const struct drm_mode_config_funcs tegra_drm_mode_config_funcs = {
	.fb_create = tegra_fb_create,
#ifdef CONFIG_DRM_FBDEV_EMULATION
	.output_poll_changed = drm_fb_helper_output_poll_changed,
#endif
	.atomic_check = tegra_atomic_check,
	.atomic_commit = drm_atomic_helper_commit,
};

static void tegra_atomic_commit_tail(struct drm_atomic_state *old_state)
{
	struct drm_device *drm = old_state->dev;
	struct tegra_drm *tegra = drm->dev_private;

	if (tegra->hub) {
		bool fence_cookie = dma_fence_begin_signalling();

		drm_atomic_helper_commit_modeset_disables(drm, old_state);
		tegra_display_hub_atomic_commit(drm, old_state);
		drm_atomic_helper_commit_planes(drm, old_state, 0);
		drm_atomic_helper_commit_modeset_enables(drm, old_state);
		drm_atomic_helper_commit_hw_done(old_state);
		dma_fence_end_signalling(fence_cookie);
		drm_atomic_helper_wait_for_vblanks(drm, old_state);
		drm_atomic_helper_cleanup_planes(drm, old_state);
	} else {
		drm_atomic_helper_commit_tail_rpm(old_state);
	}
}

static const struct drm_mode_config_helper_funcs
tegra_drm_mode_config_helpers = {
	.atomic_commit_tail = tegra_atomic_commit_tail,
};

static int tegra_drm_open(struct drm_device *drm, struct drm_file *filp)
{
	struct tegra_drm_file *fpriv;

	fpriv = kzalloc(sizeof(*fpriv), GFP_KERNEL);
	if (!fpriv)
		return -ENOMEM;

	idr_init_base(&fpriv->contexts, 1);
	mutex_init(&fpriv->lock);
	filp->driver_priv = fpriv;

	return 0;
}

static void tegra_drm_context_free(struct tegra_drm_context *context)
{
	context->client->ops->close_channel(context);
	kfree(context);
}

static struct host1x_bo *
host1x_bo_lookup(struct drm_file *file, u32 handle)
{
	struct drm_gem_object *gem;
	struct tegra_bo *bo;

	gem = drm_gem_object_lookup(file, handle);
	if (!gem)
		return NULL;

	bo = to_tegra_bo(gem);
	return &bo->base;
}

static int host1x_reloc_copy_from_user(struct host1x_reloc *dest,
				       struct drm_tegra_reloc __user *src,
				       struct drm_device *drm,
				       struct drm_file *file)
{
	u32 cmdbuf, target;
	int err;

	err = get_user(cmdbuf, &src->cmdbuf.handle);
	if (err < 0)
		return err;

	err = get_user(dest->cmdbuf.offset, &src->cmdbuf.offset);
	if (err < 0)
		return err;

	err = get_user(target, &src->target.handle);
	if (err < 0)
		return err;

	err = get_user(dest->target.offset, &src->target.offset);
	if (err < 0)
		return err;

	err = get_user(dest->shift, &src->shift);
	if (err < 0)
		return err;

	dest->flags = HOST1X_RELOC_READ | HOST1X_RELOC_WRITE;

	dest->cmdbuf.bo = host1x_bo_lookup(file, cmdbuf);
	if (!dest->cmdbuf.bo)
		return -ENOENT;

	dest->target.bo = host1x_bo_lookup(file, target);
	if (!dest->target.bo)
		return -ENOENT;

	return 0;
}

int tegra_drm_submit(struct tegra_drm_context *context,
		     struct drm_tegra_submit *args, struct drm_device *drm,
		     struct drm_file *file)
{
	struct host1x_client *client = &context->client->base;
	unsigned int num_cmdbufs = args->num_cmdbufs;
	unsigned int num_relocs = args->num_relocs;
	struct drm_tegra_cmdbuf __user *user_cmdbufs;
	struct drm_tegra_reloc __user *user_relocs;
	struct drm_tegra_syncpt __user *user_syncpt;
	struct drm_tegra_syncpt syncpt;
	struct host1x *host1x = dev_get_drvdata(drm->dev->parent);
	struct drm_gem_object **refs;
	struct host1x_syncpt *sp = NULL;
	struct host1x_job *job;
	unsigned int num_refs;
	int err;

	user_cmdbufs = u64_to_user_ptr(args->cmdbufs);
	user_relocs = u64_to_user_ptr(args->relocs);
	user_syncpt = u64_to_user_ptr(args->syncpts);

	/* We don't yet support other than one syncpt_incr struct per submit */
	if (args->num_syncpts != 1)
		return -EINVAL;

	/* We don't yet support waitchks */
	if (args->num_waitchks != 0)
		return -EINVAL;

	job = host1x_job_alloc(context->channel, args->num_cmdbufs,
			       args->num_relocs, false);
	if (!job)
		return -ENOMEM;

	job->num_relocs = args->num_relocs;