drm.c

/*
 * Copyright (C) 2012 Avionic Design GmbH
 * Copyright (C) 2012-2013 NVIDIA CORPORATION.  All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/host1x.h>
#include <linux/iommu.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

struct tegra_drm_file {
	struct list_head contexts;
};

static const struct drm_mode_config_funcs tegra_drm_mode_funcs = {
	.fb_create = tegra_fb_create,
#ifdef CONFIG_DRM_TEGRA_FBDEV
	.output_poll_changed = tegra_fb_output_poll_changed,
#endif
};

static int tegra_drm_load(struct drm_device *drm, unsigned long flags)
{
	struct host1x_device *device = to_host1x_device(drm->dev);
	struct tegra_drm *tegra;
	int err;

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

	if (iommu_present(&platform_bus_type)) {
		tegra->domain = iommu_domain_alloc(&platform_bus_type);
		if (!tegra->domain) {
			err = -ENOMEM;
			goto free;
		}

		DRM_DEBUG("IOMMU context initialized\n");
		drm_mm_init(&tegra->mm, 0, SZ_2G);
	}

	mutex_init(&tegra->clients_lock);
	INIT_LIST_HEAD(&tegra->clients);
	drm->dev_private = tegra;
	tegra->drm = drm;

	drm_mode_config_init(drm);

	drm->mode_config.min_width = 0;
	drm->mode_config.min_height = 0;

	drm->mode_config.max_width = 4096;
	drm->mode_config.max_height = 4096;

	drm->mode_config.funcs = &tegra_drm_mode_funcs;

	err = tegra_drm_fb_prepare(drm);
	if (err < 0)
		goto config;

	drm_kms_helper_poll_init(drm);

	err = host1x_device_init(device);
	if (err < 0)
		goto fbdev;

	drm_mode_config_reset(drm);

	/*
	 * We don't use the drm_irq_install() helpers provided by the DRM
	 * core, so we need to set this manually in order to allow the
	 * DRM_IOCTL_WAIT_VBLANK to operate correctly.
	 */
	drm->irq_enabled = true;

	err = drm_vblank_init(drm, drm->mode_config.num_crtc);
	if (err < 0)
		goto device;

	err = tegra_drm_fb_init(drm);
	if (err < 0)
		goto vblank;

	return 0;

vblank:
	drm_vblank_cleanup(drm);
device:
	host1x_device_exit(device);
fbdev:
	drm_kms_helper_poll_fini(drm);
	tegra_drm_fb_free(drm);
config:
	drm_mode_config_cleanup(drm);

	if (tegra->domain) {
		iommu_domain_free(tegra->domain);
		drm_mm_takedown(&tegra->mm);
	}
free:
	kfree(tegra);
	return err;
}

static int tegra_drm_unload(struct drm_device *drm)
{
	struct host1x_device *device = to_host1x_device(drm->dev);
	struct tegra_drm *tegra = drm->dev_private;
	int err;

	drm_kms_helper_poll_fini(drm);
	tegra_drm_fb_exit(drm);
	drm_mode_config_cleanup(drm);
	drm_vblank_cleanup(drm);

	err = host1x_device_exit(device);
	if (err < 0)
		return err;

	if (tegra->domain) {
		iommu_domain_free(tegra->domain);
		drm_mm_takedown(&tegra->mm);
	}

	kfree(tegra);

	return 0;
}

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;

	INIT_LIST_HEAD(&fpriv->contexts);
	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 void tegra_drm_lastclose(struct drm_device *drm)
{
#ifdef CONFIG_DRM_TEGRA_FBDEV
	struct tegra_drm *tegra = drm->dev_private;

	tegra_fbdev_restore_mode(tegra->fbdev);
#endif
}

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

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

	mutex_lock(&drm->struct_mutex);
	drm_gem_object_unreference(gem);
	mutex_unlock(&drm->struct_mutex);

	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;