// SPDX-License-Identifier: GPL-2.0 OR MIT
/* Copyright 2017-2019 Qiang Yu <yuq825@gmail.com> */

#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/uaccess.h>
#include <linux/slab.h>
#include <linux/pm_runtime.h>
#include <drm/drm_ioctl.h>
#include <drm/drm_drv.h>
#include <drm/drm_prime.h>
#include <drm/lima_drm.h>

#include "lima_device.h"
#include "lima_drv.h"
#include "lima_gem.h"
#include "lima_vm.h"

int lima_sched_timeout_ms;
uint lima_heap_init_nr_pages = 8;
uint lima_max_error_tasks;
uint lima_job_hang_limit;

MODULE_PARM_DESC(sched_timeout_ms, "task run timeout in ms");
module_param_named(sched_timeout_ms, lima_sched_timeout_ms, int, 0444);

MODULE_PARM_DESC(heap_init_nr_pages, "heap buffer init number of pages");
module_param_named(heap_init_nr_pages, lima_heap_init_nr_pages, uint, 0444);

MODULE_PARM_DESC(max_error_tasks, "max number of error tasks to save");
module_param_named(max_error_tasks, lima_max_error_tasks, uint, 0644);

MODULE_PARM_DESC(job_hang_limit, "number of times to allow a job to hang before dropping it (default 0)");
module_param_named(job_hang_limit, lima_job_hang_limit, uint, 0444);

static int lima_ioctl_get_param(struct drm_device *dev, void *data, struct drm_file *file)
{
	struct drm_lima_get_param *args = data;
	struct lima_device *ldev = to_lima_dev(dev);

	if (args->pad)
		return -EINVAL;

	switch (args->param) {
	case DRM_LIMA_PARAM_GPU_ID:
		switch (ldev->id) {
		case lima_gpu_mali400:
			args->value = DRM_LIMA_PARAM_GPU_ID_MALI400;
			break;
		case lima_gpu_mali450:
			args->value = DRM_LIMA_PARAM_GPU_ID_MALI450;
			break;
		default:
			args->value = DRM_LIMA_PARAM_GPU_ID_UNKNOWN;
			break;
		}
		break;

	case DRM_LIMA_PARAM_NUM_PP:
		args->value = ldev->pipe[lima_pipe_pp].num_processor;
		break;

	case DRM_LIMA_PARAM_GP_VERSION:
		args->value = ldev->gp_version;
		break;

	case DRM_LIMA_PARAM_PP_VERSION:
		args->value = ldev->pp_version;
		break;

	default:
		return -EINVAL;
	}

	return 0;
}

static int lima_ioctl_gem_create(struct drm_device *dev, void *data, struct drm_file *file)
{
	struct drm_lima_gem_create *args = data;

	if (args->pad)
		return -EINVAL;

	if (args->flags & ~(LIMA_BO_FLAG_HEAP))
		return -EINVAL;

	if (args->size == 0)
		return -EINVAL;

	return lima_gem_create_handle(dev, file, args->size, args->flags, &args->handle);
}

static int lima_ioctl_gem_info(struct drm_device *dev, void *data, struct drm_file *file)
{
	struct drm_lima_gem_info *args = data;

	return lima_gem_get_info(file, args->handle, &args->va, &args->offset);
}

static int lima_ioctl_gem_submit(struct drm_device *dev, void *data, struct drm_file *file)
{
	struct drm_lima_gem_submit *args = data;
	struct lima_device *ldev = to_lima_dev(dev);
	struct lima_drm_priv *priv = file->driver_priv;
	struct drm_lima_gem_submit_bo *bos;
	struct lima_sched_pipe *pipe;
	struct lima_sched_task *task;
	struct lima_ctx *ctx;
	struct lima_submit submit = {0};
	size_t size;
	int err = 0;

	if (args->pipe >= lima_pipe_num || args->nr_bos == 0)
		return -EINVAL;

	if (args->flags & ~(LIMA_SUBMIT_FLAG_EXPLICIT_FENCE))
		return -EINVAL;

	pipe = ldev->pipe + args->pipe;
	if (args->frame_size != pipe->frame_size)
		return -EINVAL;

	bos = kvcalloc(args->nr_bos, sizeof(*submit.bos) + sizeof(*submit.lbos), GFP_KERNEL);
	if (!bos)
		return -ENOMEM;

	size = args->nr_bos * sizeof(*submit.bos);
	if (copy_from_user(bos, u64_to_user_ptr(args->bos), size)) {
		err = -EFAULT;
		goto out0;
	}

	task = kmem_cache_zalloc(pipe->task_slab, GFP_KERNEL);
	if (!task) {
		err = -ENOMEM;
		goto out0;
	}

	task->frame = task + 1;
	if (copy_from_user(task->frame, u64_to_user_ptr(args->frame), args->frame_size)) {
		err = -EFAULT;
		goto out1;
	}

	err = pipe->task_validate(pipe, task);
	if (err)
		goto out1;

	ctx = lima_ctx_get(&priv->ctx_mgr, args->ctx);
	if (!ctx) {
		err = -ENOENT;
		goto out1;
	}

	submit.pipe = args->pipe;
	submit.bos = bos;
	submit.lbos = (void *)bos + size;
	submit.nr_bos = args->nr_bos;
	submit.task = task;
	submit.ctx = ctx;
	submit.flags = args->flags;
	submit.in_sync[0] = args->in_sync[0];
	submit.in_sync[1] = args->in_sync[1];
	submit.out_sync = args->out_sync;

	err = lima_gem_submit(file, &submit);

	lima_ctx_put(ctx);
out1:
	if (err)
		kmem_cache_free(pipe->task_slab, task);
out0:
	kvfree(bos);
	return err;
}

static int lima_ioctl_gem_wait(struct drm_device *dev, void *data, struct drm_file *file)
{
	struct drm_lima_gem_wait *args = data;

	if (args->op & ~(LIMA_GEM_WAIT_READ|LIMA_GEM_WAIT_WRITE))
		return -EINVAL;

	return lima_gem_wait(file, args->handle, args->op, args->timeout_ns);
}

static int lima_ioctl_ctx_create(struct drm_device *dev, void *data, struct drm_file *file)
{
	struct drm_lima_ctx_create *args = data;
	struct lima_drm_priv *priv = file->driver_priv;
	struct lima_device *ldev = to_lima_dev(dev);

	if (args->_pad)
		return -EINVAL;

	return lima_ctx_create(ldev, &priv->ctx_mgr, &args->id);
}

static int lima_ioctl_ctx_free(struct drm_device *dev, void *data, struct drm_file *file)
{
	struct drm_lima_ctx_create *args = data;
	struct lima_drm_priv *priv = file->driver_priv;

	if (args->_pad)
		return -EINVAL;

	return lima_ctx_free(&priv->ctx_mgr, args->id);
}

static int lima_drm_driver_open(struct drm_device *dev, struct drm_file *file)
{
	int err;
	struct lima_drm_priv *priv;
	struct lima_device *ldev = to_lima_dev(dev);

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

	priv->vm = lima_vm_create(ldev);
	if (!priv->vm) {
		err = -ENOMEM;
		goto err_out0;
	}

	lima_ctx_mgr_init(&priv->ctx_mgr);

	file->driver_priv = priv;
	return 0;

err_out0:
	kfree(priv);
	return err;
}

static void lima_drm_driver_postclose(struct drm_device *dev, struct drm_file *file)
{
	struct lima_drm_priv *priv = file->driver_priv;

	lima_ctx_mgr_fini(&priv->ctx_mgr);
	lima_vm_put(priv->vm);
	kfree(priv);
}

static const struct drm_ioctl_desc lima_drm_driver_ioctls[] = {
	DRM_IOCTL_DEF_DRV(LIMA_GET_PARAM, lima_ioctl_get_param, DRM_RENDER_ALLOW),
	DRM_IOCTL_DEF_DRV(LIMA_GEM_CREATE, lima_ioctl_gem_create, DRM_RENDER_ALLOW),
	DRM_IOCTL_DEF_DRV(LIMA_GEM_INFO, lima_ioctl_gem_info, DRM_RENDER_ALLOW),
	DRM_IOCTL_DEF_DRV(LIMA_GEM_SUBMIT, lima_ioctl_gem_submit, DRM_RENDER_ALLOW),
	DRM_IOCTL_DEF_DRV(LIMA_GEM_WAIT, lima_ioctl_gem_wait, DRM_RENDER_ALLOW),
	DRM_IOCTL_DEF_DRV(LIMA_CTX_CREATE, lima_ioctl_ctx_create, DRM_RENDER_ALLOW),
	DRM_IOCTL_DEF_DRV(LIMA_CTX_FREE, lima_ioctl_ctx_free, DRM_RENDER_ALLOW),
};

DEFINE_DRM_GEM_FOPS(lima_drm_driver_fops);

/*
 * Changelog:
 *
 * - 1.1.0 - add heap buffer support
 */

static const struct drm_driver lima_drm_driver = {
	.driver_features    = DRIVER_RENDER | DRIVER_GEM | DRIVER_SYNCOBJ,
	.open               = lima_drm_driver_open,
	.postclose          = lima_drm_driver_postclose,
	.ioctls             = lima_drm_driver_ioctls,
	.num_ioctls         = ARRAY_SIZE(lima_drm_driver_ioctls),
	.fops               = &lima_drm_driver_fops,
	.name               = "lima",
	.desc               = "lima DRM",
	.date               = "20191231",
	.major              = 1,
	.minor              = 1,
	.patchlevel         = 0,

	.gem_create_object  = lima_gem_create_object,
	.gem_prime_import_sg_table = drm_gem_shmem_prime_import_sg_table,
};

struct lima_block_reader {
	void *dst;
	size_t base;
	size_t count;
	size_t off;
	ssize_t read;
};

static bool lima_read_block(struct lima_block_reader *reader,
			    void *src, size_t src_size)
{
	size_t max_off = reader->base + src_size;

	if (reader->off < max_off) {
		size_t size = min_t(size_t, max_off - reader->off,
				    reader->count);

		memcpy(reader->dst, src + (reader->off - reader->base), size);

		reader->dst += size;
		reader->off += size;
		reader->read += size;
		reader->count -= size;
	}

	reader->base = max_off;

	return !!reader->count;
}

static ssize_t lima_error_state_read(struct file *filp, struct kobject *kobj,
				     struct bin_attribute *attr, char *buf,
				     loff_t off, size_t count)
{
	struct device *dev = kobj_to_dev(kobj);
	struct lima_device *ldev = dev_get_drvdata(dev);
	struct lima_sched_error_task *et;
	struct lima_block_reader reader = {
		.dst = buf,
		.count = count,
		.off = off,
	};

	mutex_lock(&ldev->error_task_list_lock);

	if (lima_read_block(&reader, &ldev->dump, sizeof(ldev->dump))) {
		list_for_each_entry(et, &ldev->error_task_list, list) {
			if (!lima_read_block(&reader, et->data, et->size))
				break;
		}
	}

	mutex_unlock(&ldev->error_task_list_lock);
	return reader.read;
}

static ssize_t lima_error_state_write(struct file *file, struct kobject *kobj,
				      struct bin_attribute *attr, char *buf,
				      loff_t off, size_t count)
{
	struct device *dev = kobj_to_dev(kobj);
	struct lima_device *ldev = dev_get_drvdata(dev);
	struct lima_sched_error_task *et, *tmp;

	mutex_lock(&ldev->error_task_list_lock);

	list_for_each_entry_safe(et, tmp, &ldev->error_task_list, list) {
		list_del(&et->list);
		kvfree(et);
	}

	ldev->dump.size = 0;
	ldev->dump.num_tasks = 0;

	mutex_unlock(&ldev->error_task_list_lock);

	return count;
}

static const struct bin_attribute lima_error_state_attr = {
	.attr.name = "error",
	.attr.mode = 0600,
	.size = 0,
	.read = lima_error_state_read,
	.write = lima_error_state_write,
};

static int lima_pdev_probe(struct platform_device *pdev)
{
	struct lima_device *ldev;
	struct drm_device *ddev;
	int err;

	err = lima_sched_slab_init();
	if (err)
		return err;

	ldev = devm_kzalloc(&pdev->dev, sizeof(*ldev), GFP_KERNEL);
	if (!ldev) {
		err = -ENOMEM;
		goto err_out0;
	}

	ldev->dev = &pdev->dev;
	ldev->id = (enum lima_gpu_id)of_device_get_match_data(&pdev->dev);

	platform_set_drvdata(pdev, ldev);

	/* Allocate and initialize the DRM device. */
	ddev = drm_dev_alloc(&lima_drm_driver, &pdev->dev);
	if (IS_ERR(ddev)) {
		err = PTR_ERR(ddev);
		goto err_out0;
	}

	ddev->dev_private = ldev;
	ldev->ddev = ddev;

	err = lima_device_init(ldev);
	if (err)
		goto err_out1;

	err = lima_devfreq_init(ldev);
	if (err) {
		dev_err(&pdev->dev, "Fatal error during devfreq init\n");
		goto err_out2;
	}

	pm_runtime_set_active(ldev->dev);
	pm_runtime_mark_last_busy(ldev->dev);
	pm_runtime_set_autosuspend_delay(ldev->dev, 200);
	pm_runtime_use_autosuspend(ldev->dev);
	pm_runtime_enable(ldev->dev);

	/*
	 * Register the DRM device with the core and the connectors with
	 * sysfs.
	 */
	err = drm_dev_register(ddev, 0);
	if (err < 0)
		goto err_out3;

	if (sysfs_create_bin_file(&ldev->dev->kobj, &lima_error_state_attr))
		dev_warn(ldev->dev, "fail to create error state sysfs\n");

	return 0;

err_out3:
	pm_runtime_disable(ldev->dev);
	lima_devfreq_fini(ldev);
err_out2:
	lima_device_fini(ldev);
err_out1:
	drm_dev_put(ddev);
err_out0:
	lima_sched_slab_fini();
	return err;
}

static void lima_pdev_remove(struct platform_device *pdev)
{
	struct lima_device *ldev = platform_get_drvdata(pdev);
	struct drm_device *ddev = ldev->ddev;

	sysfs_remove_bin_file(&ldev->dev->kobj, &lima_error_state_attr);

	drm_dev_unregister(ddev);

	/* stop autosuspend to make sure device is in active state */
	pm_runtime_set_autosuspend_delay(ldev->dev, -1);
	pm_runtime_disable(ldev->dev);

	lima_devfreq_fini(ldev);
	lima_device_fini(ldev);

	drm_dev_put(ddev);
	lima_sched_slab_fini();
}

static const struct of_device_id dt_match[] = {
	{ .compatible = "arm,mali-400", .data = (void *)lima_gpu_mali400 },
	{ .compatible = "arm,mali-450", .data = (void *)lima_gpu_mali450 },
	{}
};
MODULE_DEVICE_TABLE(of, dt_match);

static const struct dev_pm_ops lima_pm_ops = {
	SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend, pm_runtime_force_resume)
	SET_RUNTIME_PM_OPS(lima_device_suspend, lima_device_resume, NULL)
};

static struct platform_driver lima_platform_driver = {
	.probe      = lima_pdev_probe,
	.remove_new = lima_pdev_remove,
	.driver     = {
		.name   = "lima",
		.pm	= &lima_pm_ops,
		.of_match_table = dt_match,
	},
};

module_platform_driver(lima_platform_driver);

MODULE_AUTHOR("Lima Project Developers");
MODULE_DESCRIPTION("Lima DRM Driver");
MODULE_LICENSE("GPL v2");