[deliverable/linux.git] / drivers / gpu / drm / exynos / exynos_drm_gem.c

/* exynos_drm_gem.c
 *
 * Copyright (c) 2011 Samsung Electronics Co., Ltd.
 * Author: Inki Dae <inki.dae@samsung.com>
 *
 * This program is free software; you can redistribute  it and/or modify it
 * under  the terms of  the GNU General  Public License as published by the
 * Free Software Foundation;  either version 2 of the  License, or (at your
 * option) any later version.
 */

#include <drm/drmP.h>
#include <drm/drm_vma_manager.h>

#include <linux/shmem_fs.h>
#include <drm/exynos_drm.h>

#include "exynos_drm_drv.h"
#include "exynos_drm_gem.h"
#include "exynos_drm_buf.h"
#include "exynos_drm_iommu.h"

static unsigned int convert_to_vm_err_msg(int msg)
{
	unsigned int out_msg;

	switch (msg) {
	case 0:
	case -ERESTARTSYS:
	case -EINTR:
		out_msg = VM_FAULT_NOPAGE;
		break;

	case -ENOMEM:
		out_msg = VM_FAULT_OOM;
		break;

	default:
		out_msg = VM_FAULT_SIGBUS;
		break;
	}

	return out_msg;
}

static int check_gem_flags(unsigned int flags)
{
	if (flags & ~(EXYNOS_BO_MASK)) {
		DRM_ERROR("invalid flags.\n");
		return -EINVAL;
	}

	return 0;
}

static void update_vm_cache_attr(struct exynos_drm_gem_obj *obj,
					struct vm_area_struct *vma)
{
	DRM_DEBUG_KMS("flags = 0x%x\n", obj->flags);

	/* non-cachable as default. */
	if (obj->flags & EXYNOS_BO_CACHABLE)
		vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
	else if (obj->flags & EXYNOS_BO_WC)
		vma->vm_page_prot =
			pgprot_writecombine(vm_get_page_prot(vma->vm_flags));
	else
		vma->vm_page_prot =
			pgprot_noncached(vm_get_page_prot(vma->vm_flags));
}

static unsigned long roundup_gem_size(unsigned long size, unsigned int flags)
{
	/* TODO */

	return roundup(size, PAGE_SIZE);
}

static int exynos_drm_gem_map_buf(struct drm_gem_object *obj,
					struct vm_area_struct *vma,
					unsigned long f_vaddr,
					pgoff_t page_offset)
{
	struct exynos_drm_gem_obj *exynos_gem_obj = to_exynos_gem_obj(obj);
	struct exynos_drm_gem_buf *buf = exynos_gem_obj->buffer;
	struct scatterlist *sgl;
	unsigned long pfn;
	int i;

	if (!buf->sgt)
		return -EINTR;

	if (page_offset >= (buf->size >> PAGE_SHIFT)) {
		DRM_ERROR("invalid page offset\n");
		return -EINVAL;
	}

	sgl = buf->sgt->sgl;
	for_each_sg(buf->sgt->sgl, sgl, buf->sgt->nents, i) {
		if (page_offset < (sgl->length >> PAGE_SHIFT))
			break;
		page_offset -=	(sgl->length >> PAGE_SHIFT);
	}

	pfn = __phys_to_pfn(sg_phys(sgl)) + page_offset;

	return vm_insert_mixed(vma, f_vaddr, pfn);
}

static int exynos_drm_gem_handle_create(struct drm_gem_object *obj,
					struct drm_file *file_priv,
					unsigned int *handle)
{
	int ret;

	/*
	 * allocate a id of idr table where the obj is registered
	 * and handle has the id what user can see.
	 */
	ret = drm_gem_handle_create(file_priv, obj, handle);
	if (ret)
		return ret;

	DRM_DEBUG_KMS("gem handle = 0x%x\n", *handle);

	/* drop reference from allocate - handle holds it now. */
	drm_gem_object_unreference_unlocked(obj);

	return 0;
}

void exynos_drm_gem_destroy(struct exynos_drm_gem_obj *exynos_gem_obj)
{
	struct drm_gem_object *obj;
	struct exynos_drm_gem_buf *buf;

	obj = &exynos_gem_obj->base;
	buf = exynos_gem_obj->buffer;

	DRM_DEBUG_KMS("handle count = %d\n", obj->handle_count);

	/*
	 * do not release memory region from exporter.
	 *
	 * the region will be released by exporter
	 * once dmabuf's refcount becomes 0.
	 */
	if (obj->import_attach)
		goto out;

	exynos_drm_free_buf(obj->dev, exynos_gem_obj->flags, buf);

out:
	exynos_drm_fini_buf(obj->dev, buf);
	exynos_gem_obj->buffer = NULL;

	drm_gem_free_mmap_offset(obj);

	/* release file pointer to gem object. */
	drm_gem_object_release(obj);

	kfree(exynos_gem_obj);
	exynos_gem_obj = NULL;
}

unsigned long exynos_drm_gem_get_size(struct drm_device *dev,
						unsigned int gem_handle,
						struct drm_file *file_priv)
{
	struct exynos_drm_gem_obj *exynos_gem_obj;
	struct drm_gem_object *obj;

	obj = drm_gem_object_lookup(dev, file_priv, gem_handle);
	if (!obj) {
		DRM_ERROR("failed to lookup gem object.\n");
		return 0;
	}

	exynos_gem_obj = to_exynos_gem_obj(obj);

	drm_gem_object_unreference_unlocked(obj);

	return exynos_gem_obj->buffer->size;
}


struct exynos_drm_gem_obj *exynos_drm_gem_init(struct drm_device *dev,
						      unsigned long size)
{
	struct exynos_drm_gem_obj *exynos_gem_obj;
	struct drm_gem_object *obj;
	int ret;

	exynos_gem_obj = kzalloc(sizeof(*exynos_gem_obj), GFP_KERNEL);
	if (!exynos_gem_obj)
		return NULL;

	exynos_gem_obj->size = size;
	obj = &exynos_gem_obj->base;

	ret = drm_gem_object_init(dev, obj, size);
	if (ret < 0) {
		DRM_ERROR("failed to initialize gem object\n");
		kfree(exynos_gem_obj);
		return NULL;
	}

	DRM_DEBUG_KMS("created file object = 0x%x\n", (unsigned int)obj->filp);

	return exynos_gem_obj;
}

struct exynos_drm_gem_obj *exynos_drm_gem_create(struct drm_device *dev,
						unsigned int flags,
						unsigned long size)
{
	struct exynos_drm_gem_obj *exynos_gem_obj;
	struct exynos_drm_gem_buf *buf;
	int ret;

	if (!size) {
		DRM_ERROR("invalid size.\n");
		return ERR_PTR(-EINVAL);
	}

	size = roundup_gem_size(size, flags);

	ret = check_gem_flags(flags);
	if (ret)
		return ERR_PTR(ret);

	buf = exynos_drm_init_buf(dev, size);
	if (!buf)
		return ERR_PTR(-ENOMEM);

	exynos_gem_obj = exynos_drm_gem_init(dev, size);
	if (!exynos_gem_obj) {
		ret = -ENOMEM;
		goto err_fini_buf;
	}

	exynos_gem_obj->buffer = buf;

	/* set memory type and cache attribute from user side. */
	exynos_gem_obj->flags = flags;

	ret = exynos_drm_alloc_buf(dev, buf, flags);
	if (ret < 0)
		goto err_gem_fini;

	return exynos_gem_obj;

err_gem_fini:
	drm_gem_object_release(&exynos_gem_obj->base);
	kfree(exynos_gem_obj);
err_fini_buf:
	exynos_drm_fini_buf(dev, buf);
	return ERR_PTR(ret);
}

int exynos_drm_gem_create_ioctl(struct drm_device *dev, void *data,
				struct drm_file *file_priv)
{
	struct drm_exynos_gem_create *args = data;
	struct exynos_drm_gem_obj *exynos_gem_obj;
	int ret;

	exynos_gem_obj = exynos_drm_gem_create(dev, args->flags, args->size);
	if (IS_ERR(exynos_gem_obj))
		return PTR_ERR(exynos_gem_obj);

	ret = exynos_drm_gem_handle_create(&exynos_gem_obj->base, file_priv,
			&args->handle);
	if (ret) {
		exynos_drm_gem_destroy(exynos_gem_obj);
		return ret;
	}

	return 0;
}

dma_addr_t *exynos_drm_gem_get_dma_addr(struct drm_device *dev,
					unsigned int gem_handle,
					struct drm_file *filp)
{
	struct exynos_drm_gem_obj *exynos_gem_obj;
	struct drm_gem_object *obj;

	obj = drm_gem_object_lookup(dev, filp, gem_handle);
	if (!obj) {
		DRM_ERROR("failed to lookup gem object.\n");
		return ERR_PTR(-EINVAL);
	}

	exynos_gem_obj = to_exynos_gem_obj(obj);

	return &exynos_gem_obj->buffer->dma_addr;
}

void exynos_drm_gem_put_dma_addr(struct drm_device *dev,
					unsigned int gem_handle,
					struct drm_file *filp)
{
	struct drm_gem_object *obj;

	obj = drm_gem_object_lookup(dev, filp, gem_handle);
	if (!obj) {
		DRM_ERROR("failed to lookup gem object.\n");
		return;
	}

	drm_gem_object_unreference_unlocked(obj);

	/*
	 * decrease obj->refcount one more time because we has already
	 * increased it at exynos_drm_gem_get_dma_addr().
	 */
	drm_gem_object_unreference_unlocked(obj);
}

int exynos_drm_gem_mmap_buffer(struct exynos_drm_gem_obj *exynos_gem_obj,
				      struct vm_area_struct *vma)
{
	struct drm_device *drm_dev = exynos_gem_obj->base.dev;
	struct exynos_drm_gem_buf *buffer;
	unsigned long vm_size;
	int ret;

	vma->vm_flags &= ~VM_PFNMAP;
	vma->vm_pgoff = 0;

	vm_size = vma->vm_end - vma->vm_start;

	/*
	 * a buffer contains information to physically continuous memory
	 * allocated by user request or at framebuffer creation.
	 */
	buffer = exynos_gem_obj->buffer;

	/* check if user-requested size is valid. */
	if (vm_size > buffer->size)
		return -EINVAL;

	ret = dma_mmap_attrs(drm_dev->dev, vma, buffer->pages,
				buffer->dma_addr, buffer->size,
				&buffer->dma_attrs);
	if (ret < 0) {
		DRM_ERROR("failed to mmap.\n");
		return ret;
	}

	return 0;
}

int exynos_drm_gem_get_ioctl(struct drm_device *dev, void *data,
				      struct drm_file *file_priv)
{	struct exynos_drm_gem_obj *exynos_gem_obj;
	struct drm_exynos_gem_info *args = data;
	struct drm_gem_object *obj;

	mutex_lock(&dev->struct_mutex);

	obj = drm_gem_object_lookup(dev, file_priv, args->handle);
	if (!obj) {
		DRM_ERROR("failed to lookup gem object.\n");
		mutex_unlock(&dev->struct_mutex);
		return -EINVAL;
	}

	exynos_gem_obj = to_exynos_gem_obj(obj);

	args->flags = exynos_gem_obj->flags;
	args->size = exynos_gem_obj->size;

	drm_gem_object_unreference(obj);
	mutex_unlock(&dev->struct_mutex);

	return 0;
}

struct vm_area_struct *exynos_gem_get_vma(struct vm_area_struct *vma)
{
	struct vm_area_struct *vma_copy;

	vma_copy = kmalloc(sizeof(*vma_copy), GFP_KERNEL);
	if (!vma_copy)
		return NULL;

	if (vma->vm_ops && vma->vm_ops->open)
		vma->vm_ops->open(vma);

	if (vma->vm_file)
		get_file(vma->vm_file);

	memcpy(vma_copy, vma, sizeof(*vma));

	vma_copy->vm_mm = NULL;
	vma_copy->vm_next = NULL;
	vma_copy->vm_prev = NULL;

	return vma_copy;
}

void exynos_gem_put_vma(struct vm_area_struct *vma)
{
	if (!vma)
		return;

	if (vma->vm_ops && vma->vm_ops->close)
		vma->vm_ops->close(vma);

	if (vma->vm_file)
		fput(vma->vm_file);

	kfree(vma);
}

int exynos_gem_get_pages_from_userptr(unsigned long start,
						unsigned int npages,
						struct page **pages,
						struct vm_area_struct *vma)
{
	int get_npages;

	/* the memory region mmaped with VM_PFNMAP. */
	if (vma_is_io(vma)) {
		unsigned int i;

		for (i = 0; i < npages; ++i, start += PAGE_SIZE) {
			unsigned long pfn;
			int ret = follow_pfn(vma, start, &pfn);
			if (ret)
				return ret;

			pages[i] = pfn_to_page(pfn);
		}

		if (i != npages) {
			DRM_ERROR("failed to get user_pages.\n");
			return -EINVAL;
		}

		return 0;
	}

	get_npages = get_user_pages(current, current->mm, start,
					npages, 1, 1, pages, NULL);
	get_npages = max(get_npages, 0);
	if (get_npages != npages) {
		DRM_ERROR("failed to get user_pages.\n");
		while (get_npages)
			put_page(pages[--get_npages]);
		return -EFAULT;
	}

	return 0;
}

void exynos_gem_put_pages_to_userptr(struct page **pages,
					unsigned int npages,
					struct vm_area_struct *vma)
{
	if (!vma_is_io(vma)) {
		unsigned int i;

		for (i = 0; i < npages; i++) {
			set_page_dirty_lock(pages[i]);

			/*
			 * undo the reference we took when populating
			 * the table.
			 */
			put_page(pages[i]);
		}
	}
}

int exynos_gem_map_sgt_with_dma(struct drm_device *drm_dev,
				struct sg_table *sgt,
				enum dma_data_direction dir)
{
	int nents;

	mutex_lock(&drm_dev->struct_mutex);

	nents = dma_map_sg(drm_dev->dev, sgt->sgl, sgt->nents, dir);
	if (!nents) {
		DRM_ERROR("failed to map sgl with dma.\n");
		mutex_unlock(&drm_dev->struct_mutex);
		return nents;
	}

	mutex_unlock(&drm_dev->struct_mutex);
	return 0;
}

void exynos_gem_unmap_sgt_from_dma(struct drm_device *drm_dev,
				struct sg_table *sgt,
				enum dma_data_direction dir)
{
	dma_unmap_sg(drm_dev->dev, sgt->sgl, sgt->nents, dir);
}

void exynos_drm_gem_free_object(struct drm_gem_object *obj)
{
	struct exynos_drm_gem_obj *exynos_gem_obj;
	struct exynos_drm_gem_buf *buf;

	exynos_gem_obj = to_exynos_gem_obj(obj);
	buf = exynos_gem_obj->buffer;

	if (obj->import_attach)
		drm_prime_gem_destroy(obj, buf->sgt);

	exynos_drm_gem_destroy(to_exynos_gem_obj(obj));
}

int exynos_drm_gem_dumb_create(struct drm_file *file_priv,
			       struct drm_device *dev,
			       struct drm_mode_create_dumb *args)
{
	struct exynos_drm_gem_obj *exynos_gem_obj;
	int ret;

	/*
	 * allocate memory to be used for framebuffer.
	 * - this callback would be called by user application
	 *	with DRM_IOCTL_MODE_CREATE_DUMB command.
	 */

	args->pitch = args->width * ((args->bpp + 7) / 8);
	args->size = args->pitch * args->height;

	if (is_drm_iommu_supported(dev)) {
		exynos_gem_obj = exynos_drm_gem_create(dev,
			EXYNOS_BO_NONCONTIG | EXYNOS_BO_WC,
			args->size);
	} else {
		exynos_gem_obj = exynos_drm_gem_create(dev,
			EXYNOS_BO_CONTIG | EXYNOS_BO_WC,
			args->size);
	}

	if (IS_ERR(exynos_gem_obj)) {
		dev_warn(dev->dev, "FB allocation failed.\n");
		return PTR_ERR(exynos_gem_obj);
	}

	ret = exynos_drm_gem_handle_create(&exynos_gem_obj->base, file_priv,
			&args->handle);
	if (ret) {
		exynos_drm_gem_destroy(exynos_gem_obj);
		return ret;
	}

	return 0;
}

int exynos_drm_gem_dumb_map_offset(struct drm_file *file_priv,
				   struct drm_device *dev, uint32_t handle,
				   uint64_t *offset)
{
	struct drm_gem_object *obj;
	int ret = 0;

	mutex_lock(&dev->struct_mutex);

	/*
	 * get offset of memory allocated for drm framebuffer.
	 * - this callback would be called by user application
	 *	with DRM_IOCTL_MODE_MAP_DUMB command.
	 */

	obj = drm_gem_object_lookup(dev, file_priv, handle);
	if (!obj) {
		DRM_ERROR("failed to lookup gem object.\n");
		ret = -EINVAL;
		goto unlock;
	}

	ret = drm_gem_create_mmap_offset(obj);
	if (ret)
		goto out;

	*offset = drm_vma_node_offset_addr(&obj->vma_node);
	DRM_DEBUG_KMS("offset = 0x%lx\n", (unsigned long)*offset);

out:
	drm_gem_object_unreference(obj);
unlock:
	mutex_unlock(&dev->struct_mutex);
	return ret;
}

int exynos_drm_gem_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
{
	struct drm_gem_object *obj = vma->vm_private_data;
	struct drm_device *dev = obj->dev;
	unsigned long f_vaddr;
	pgoff_t page_offset;
	int ret;

	page_offset = ((unsigned long)vmf->virtual_address -
			vma->vm_start) >> PAGE_SHIFT;
	f_vaddr = (unsigned long)vmf->virtual_address;

	mutex_lock(&dev->struct_mutex);

	ret = exynos_drm_gem_map_buf(obj, vma, f_vaddr, page_offset);
	if (ret < 0)
		DRM_ERROR("failed to map a buffer with user.\n");

	mutex_unlock(&dev->struct_mutex);

	return convert_to_vm_err_msg(ret);
}

int exynos_drm_gem_mmap(struct file *filp, struct vm_area_struct *vma)
{
	struct exynos_drm_gem_obj *exynos_gem_obj;
	struct drm_gem_object *obj;
	int ret;

	/* set vm_area_struct. */
	ret = drm_gem_mmap(filp, vma);
	if (ret < 0) {
		DRM_ERROR("failed to mmap.\n");
		return ret;
	}

	obj = vma->vm_private_data;
	exynos_gem_obj = to_exynos_gem_obj(obj);

	ret = check_gem_flags(exynos_gem_obj->flags);
	if (ret)
		goto err_close_vm;

	update_vm_cache_attr(exynos_gem_obj, vma);

	ret = exynos_drm_gem_mmap_buffer(exynos_gem_obj, vma);
	if (ret)
		goto err_close_vm;

	return ret;

err_close_vm:
	drm_gem_vm_close(vma);
	drm_gem_free_mmap_offset(obj);

	return ret;
}
Commit	Line	Data
1c248b7d ID	1	/* exynos_drm_gem.c
	2	*
	3	* Copyright (c) 2011 Samsung Electronics Co., Ltd.
	4	* Author: Inki Dae <inki.dae@samsung.com>
	5	*
d81aecb5 ID	6	* This program is free software; you can redistribute it and/or modify it
	7	* under the terms of the GNU General Public License as published by the
	8	* Free Software Foundation; either version 2 of the License, or (at your
	9	* option) any later version.
1c248b7d ID	10	*/
1c248b7d ID	11
760285e7	12	#include <drm/drmP.h>
0de23977	13	#include <drm/drm_vma_manager.h>
1c248b7d	14
2b35892e	15	#include <linux/shmem_fs.h>
1c248b7d ID	16	#include <drm/exynos_drm.h>
	17
	18	#include "exynos_drm_drv.h"
	19	#include "exynos_drm_gem.h"
	20	#include "exynos_drm_buf.h"
3fec4532	21	#include "exynos_drm_iommu.h"
1c248b7d ID	22
	23	static unsigned int convert_to_vm_err_msg(int msg)
	24	{
	25	unsigned int out_msg;
	26
	27	switch (msg) {
	28	case 0:
	29	case -ERESTARTSYS:
	30	case -EINTR:
	31	out_msg = VM_FAULT_NOPAGE;
	32	break;
	33
	34	case -ENOMEM:
	35	out_msg = VM_FAULT_OOM;
	36	break;
	37
	38	default:
	39	out_msg = VM_FAULT_SIGBUS;
	40	break;
	41	}
	42
	43	return out_msg;
	44	}
	45
dcf9af82	46	static int check_gem_flags(unsigned int flags)
2b35892e	47	{
dcf9af82 ID	48	if (flags & ~(EXYNOS_BO_MASK)) {
	49	DRM_ERROR("invalid flags.\n");
	50	return -EINVAL;
	51	}
	52
	53	return 0;
	54	}
	55
c01d73fa ID	56	static void update_vm_cache_attr(struct exynos_drm_gem_obj *obj,
	57	struct vm_area_struct *vma)
	58	{
	59	DRM_DEBUG_KMS("flags = 0x%x\n", obj->flags);
	60
	61	/* non-cachable as default. */
	62	if (obj->flags & EXYNOS_BO_CACHABLE)
	63	vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
	64	else if (obj->flags & EXYNOS_BO_WC)
	65	vma->vm_page_prot =
	66	pgprot_writecombine(vm_get_page_prot(vma->vm_flags));
	67	else
	68	vma->vm_page_prot =
	69	pgprot_noncached(vm_get_page_prot(vma->vm_flags));
	70	}
	71
dcf9af82 ID	72	static unsigned long roundup_gem_size(unsigned long size, unsigned int flags)
dcf9af82 ID	73	{
0519f9a1	74	/* TODO */
2b35892e	75
0519f9a1	76	return roundup(size, PAGE_SIZE);
2b35892e ID	77	}
2b35892e ID	78
0519f9a1	79	static int exynos_drm_gem_map_buf(struct drm_gem_object *obj,
2b35892e ID	80	struct vm_area_struct *vma,
	81	unsigned long f_vaddr,
	82	pgoff_t page_offset)
	83	{
	84	struct exynos_drm_gem_obj *exynos_gem_obj = to_exynos_gem_obj(obj);
	85	struct exynos_drm_gem_buf *buf = exynos_gem_obj->buffer;
4ddc404b	86	struct scatterlist *sgl;
2b35892e	87	unsigned long pfn;
4ddc404b	88	int i;
2b35892e	89
465ed660 P	90	if (!buf->sgt)
	91	return -EINTR;
	92
	93	if (page_offset >= (buf->size >> PAGE_SHIFT)) {
	94	DRM_ERROR("invalid page offset\n");
	95	return -EINVAL;
4ddc404b	96	}
2b35892e	97
465ed660 P	98	sgl = buf->sgt->sgl;
	99	for_each_sg(buf->sgt->sgl, sgl, buf->sgt->nents, i) {
	100	if (page_offset < (sgl->length >> PAGE_SHIFT))
	101	break;
	102	page_offset -= (sgl->length >> PAGE_SHIFT);
	103	}
	104
	105	pfn = __phys_to_pfn(sg_phys(sgl)) + page_offset;
	106
2b35892e ID	107	return vm_insert_mixed(vma, f_vaddr, pfn);
	108	}
	109
2364839a JS	110	static int exynos_drm_gem_handle_create(struct drm_gem_object *obj,
	111	struct drm_file *file_priv,
	112	unsigned int *handle)
1c248b7d	113	{
1c248b7d ID	114	int ret;
1c248b7d ID	115
1c248b7d ID	116	/*
	117	* allocate a id of idr table where the obj is registered
	118	* and handle has the id what user can see.
	119	*/
	120	ret = drm_gem_handle_create(file_priv, obj, handle);
	121	if (ret)
2364839a	122	return ret;
1c248b7d ID	123
	124	DRM_DEBUG_KMS("gem handle = 0x%x\n", *handle);
	125
	126	/* drop reference from allocate - handle holds it now. */
	127	drm_gem_object_unreference_unlocked(obj);
	128
2364839a JS	129	return 0;
	130	}
	131
	132	void exynos_drm_gem_destroy(struct exynos_drm_gem_obj *exynos_gem_obj)
	133	{
	134	struct drm_gem_object *obj;
c01d73fa	135	struct exynos_drm_gem_buf *buf;
2364839a	136
2364839a	137	obj = &exynos_gem_obj->base;
c01d73fa	138	buf = exynos_gem_obj->buffer;
2364839a	139
a8e11d1c	140	DRM_DEBUG_KMS("handle count = %d\n", obj->handle_count);
1c248b7d	141
c374e731 ID	142	/*
	143	* do not release memory region from exporter.
	144	*
	145	* the region will be released by exporter
	146	* once dmabuf's refcount becomes 0.
	147	*/
	148	if (obj->import_attach)
	149	goto out;
	150
0519f9a1	151	exynos_drm_free_buf(obj->dev, exynos_gem_obj->flags, buf);
2b35892e	152
c374e731	153	out:
c01d73fa	154	exynos_drm_fini_buf(obj->dev, buf);
2b35892e	155	exynos_gem_obj->buffer = NULL;
2364839a	156
0de23977	157	drm_gem_free_mmap_offset(obj);
2364839a JS	158
2364839a JS	159	/* release file pointer to gem object. */
1c248b7d ID	160	drm_gem_object_release(obj);
1c248b7d ID	161
1c248b7d	162	kfree(exynos_gem_obj);
2b35892e	163	exynos_gem_obj = NULL;
2364839a JS	164	}
2364839a JS	165
a4f19aaa ID	166	unsigned long exynos_drm_gem_get_size(struct drm_device *dev,
	167	unsigned int gem_handle,
	168	struct drm_file *file_priv)
	169	{
	170	struct exynos_drm_gem_obj *exynos_gem_obj;
	171	struct drm_gem_object *obj;
	172
	173	obj = drm_gem_object_lookup(dev, file_priv, gem_handle);
	174	if (!obj) {
	175	DRM_ERROR("failed to lookup gem object.\n");
	176	return 0;
	177	}
	178
	179	exynos_gem_obj = to_exynos_gem_obj(obj);
	180
	181	drm_gem_object_unreference_unlocked(obj);
	182
	183	return exynos_gem_obj->buffer->size;
	184	}
	185
	186
b2df26c1	187	struct exynos_drm_gem_obj exynos_drm_gem_init(struct drm_device dev,
2364839a JS	188	unsigned long size)
	189	{
	190	struct exynos_drm_gem_obj *exynos_gem_obj;
	191	struct drm_gem_object *obj;
	192	int ret;
	193
	194	exynos_gem_obj = kzalloc(sizeof(*exynos_gem_obj), GFP_KERNEL);
38bb5253	195	if (!exynos_gem_obj)
2364839a	196	return NULL;
2364839a	197
2b35892e	198	exynos_gem_obj->size = size;
2364839a JS	199	obj = &exynos_gem_obj->base;
	200
	201	ret = drm_gem_object_init(dev, obj, size);
	202	if (ret < 0) {
	203	DRM_ERROR("failed to initialize gem object\n");
	204	kfree(exynos_gem_obj);
	205	return NULL;
	206	}
	207
	208	DRM_DEBUG_KMS("created file object = 0x%x\n", (unsigned int)obj->filp);
	209
	210	return exynos_gem_obj;
1c248b7d ID	211	}
1c248b7d ID	212
f088d5a9	213	struct exynos_drm_gem_obj exynos_drm_gem_create(struct drm_device dev,
2b35892e ID	214	unsigned int flags,
2b35892e ID	215	unsigned long size)
f088d5a9	216	{
2364839a	217	struct exynos_drm_gem_obj *exynos_gem_obj;
2b35892e ID	218	struct exynos_drm_gem_buf *buf;
2b35892e ID	219	int ret;
f088d5a9	220
dcf9af82 ID	221	if (!size) {
	222	DRM_ERROR("invalid size.\n");
	223	return ERR_PTR(-EINVAL);
	224	}
	225
	226	size = roundup_gem_size(size, flags);
f088d5a9	227
dcf9af82 ID	228	ret = check_gem_flags(flags);
	229	if (ret)
	230	return ERR_PTR(ret);
2b35892e ID	231
	232	buf = exynos_drm_init_buf(dev, size);
	233	if (!buf)
ee5e770e	234	return ERR_PTR(-ENOMEM);
f088d5a9	235
2364839a JS	236	exynos_gem_obj = exynos_drm_gem_init(dev, size);
2364839a JS	237	if (!exynos_gem_obj) {
2b35892e	238	ret = -ENOMEM;
dcf9af82	239	goto err_fini_buf;
f088d5a9 ID	240	}
f088d5a9 ID	241
2b35892e ID	242	exynos_gem_obj->buffer = buf;
	243
	244	/* set memory type and cache attribute from user side. */
	245	exynos_gem_obj->flags = flags;
	246
0519f9a1	247	ret = exynos_drm_alloc_buf(dev, buf, flags);
c58c1599 YC	248	if (ret < 0)
c58c1599 YC	249	goto err_gem_fini;
f088d5a9 ID	250
f088d5a9 ID	251	return exynos_gem_obj;
dcf9af82	252
c58c1599 YC	253	err_gem_fini:
	254	drm_gem_object_release(&exynos_gem_obj->base);
	255	kfree(exynos_gem_obj);
dcf9af82	256	err_fini_buf:
2b35892e ID	257	exynos_drm_fini_buf(dev, buf);
2b35892e ID	258	return ERR_PTR(ret);
f088d5a9 ID	259	}
f088d5a9 ID	260
1c248b7d	261	int exynos_drm_gem_create_ioctl(struct drm_device dev, void data,
ee5e770e	262	struct drm_file *file_priv)
1c248b7d ID	263	{
1c248b7d ID	264	struct drm_exynos_gem_create *args = data;
ee5e770e	265	struct exynos_drm_gem_obj *exynos_gem_obj;
2364839a	266	int ret;
1c248b7d	267
2b35892e	268	exynos_gem_obj = exynos_drm_gem_create(dev, args->flags, args->size);
1c248b7d ID	269	if (IS_ERR(exynos_gem_obj))
	270	return PTR_ERR(exynos_gem_obj);
	271
2364839a JS	272	ret = exynos_drm_gem_handle_create(&exynos_gem_obj->base, file_priv,
	273	&args->handle);
	274	if (ret) {
	275	exynos_drm_gem_destroy(exynos_gem_obj);
	276	return ret;
	277	}
	278
1c248b7d ID	279	return 0;
	280	}
	281
d87342c1	282	dma_addr_t exynos_drm_gem_get_dma_addr(struct drm_device dev,
f0b1bda7	283	unsigned int gem_handle,
d87342c1	284	struct drm_file *filp)
f0b1bda7 ID	285	{
	286	struct exynos_drm_gem_obj *exynos_gem_obj;
	287	struct drm_gem_object *obj;
	288
d87342c1	289	obj = drm_gem_object_lookup(dev, filp, gem_handle);
f0b1bda7 ID	290	if (!obj) {
	291	DRM_ERROR("failed to lookup gem object.\n");
	292	return ERR_PTR(-EINVAL);
	293	}
	294
	295	exynos_gem_obj = to_exynos_gem_obj(obj);
	296
f0b1bda7 ID	297	return &exynos_gem_obj->buffer->dma_addr;
	298	}
	299
	300	void exynos_drm_gem_put_dma_addr(struct drm_device *dev,
	301	unsigned int gem_handle,
d87342c1	302	struct drm_file *filp)
f0b1bda7	303	{
f0b1bda7 ID	304	struct drm_gem_object *obj;
f0b1bda7 ID	305
d87342c1	306	obj = drm_gem_object_lookup(dev, filp, gem_handle);
f0b1bda7 ID	307	if (!obj) {
	308	DRM_ERROR("failed to lookup gem object.\n");
	309	return;
	310	}
	311
f0b1bda7 ID	312	drm_gem_object_unreference_unlocked(obj);
	313
	314	/*
	315	* decrease obj->refcount one more time because we has already
	316	* increased it at exynos_drm_gem_get_dma_addr().
	317	*/
	318	drm_gem_object_unreference_unlocked(obj);
	319	}
	320
832316c7	321	int exynos_drm_gem_mmap_buffer(struct exynos_drm_gem_obj *exynos_gem_obj,
ee5e770e	322	struct vm_area_struct *vma)
1c248b7d	323	{
832316c7	324	struct drm_device *drm_dev = exynos_gem_obj->base.dev;
2c871127	325	struct exynos_drm_gem_buf *buffer;
0519f9a1	326	unsigned long vm_size;
5b07c660	327	int ret;
1c248b7d	328
832316c7 ID	329	vma->vm_flags &= ~VM_PFNMAP;
832316c7 ID	330	vma->vm_pgoff = 0;
1c248b7d	331
0519f9a1	332	vm_size = vma->vm_end - vma->vm_start;
2b35892e	333
1c248b7d	334	/*
2c871127	335	* a buffer contains information to physically continuous memory
1c248b7d ID	336	* allocated by user request or at framebuffer creation.
1c248b7d ID	337	*/
2c871127	338	buffer = exynos_gem_obj->buffer;
1c248b7d ID	339
1c248b7d ID	340	/* check if user-requested size is valid. */
2c871127	341	if (vm_size > buffer->size)
1c248b7d ID	342	return -EINVAL;
1c248b7d ID	343
4744ad24	344	ret = dma_mmap_attrs(drm_dev->dev, vma, buffer->pages,
0519f9a1 ID	345	buffer->dma_addr, buffer->size,
0519f9a1 ID	346	&buffer->dma_attrs);
5b07c660 ID	347	if (ret < 0) {
	348	DRM_ERROR("failed to mmap.\n");
	349	return ret;
	350	}
	351
1c248b7d ID	352	return 0;
	353	}
	354
40cd7e0c ID	355	int exynos_drm_gem_get_ioctl(struct drm_device dev, void data,
	356	struct drm_file *file_priv)
	357	{ struct exynos_drm_gem_obj *exynos_gem_obj;
	358	struct drm_exynos_gem_info *args = data;
	359	struct drm_gem_object *obj;
	360
	361	mutex_lock(&dev->struct_mutex);
	362
	363	obj = drm_gem_object_lookup(dev, file_priv, args->handle);
	364	if (!obj) {
	365	DRM_ERROR("failed to lookup gem object.\n");
	366	mutex_unlock(&dev->struct_mutex);
	367	return -EINVAL;
	368	}
	369
	370	exynos_gem_obj = to_exynos_gem_obj(obj);
	371
	372	args->flags = exynos_gem_obj->flags;
	373	args->size = exynos_gem_obj->size;
	374
	375	drm_gem_object_unreference(obj);
	376	mutex_unlock(&dev->struct_mutex);
	377
	378	return 0;
	379	}
	380
2a3098ff ID	381	struct vm_area_struct exynos_gem_get_vma(struct vm_area_struct vma)
	382	{
	383	struct vm_area_struct *vma_copy;
	384
	385	vma_copy = kmalloc(sizeof(*vma_copy), GFP_KERNEL);
	386	if (!vma_copy)
	387	return NULL;
	388
	389	if (vma->vm_ops && vma->vm_ops->open)
	390	vma->vm_ops->open(vma);
	391
	392	if (vma->vm_file)
	393	get_file(vma->vm_file);
	394
	395	memcpy(vma_copy, vma, sizeof(*vma));
	396
	397	vma_copy->vm_mm = NULL;
	398	vma_copy->vm_next = NULL;
	399	vma_copy->vm_prev = NULL;
	400
	401	return vma_copy;
	402	}
	403
	404	void exynos_gem_put_vma(struct vm_area_struct *vma)
	405	{
	406	if (!vma)
	407	return;
	408
	409	if (vma->vm_ops && vma->vm_ops->close)
	410	vma->vm_ops->close(vma);
	411
	412	if (vma->vm_file)
	413	fput(vma->vm_file);
	414
	415	kfree(vma);
	416	}
	417
	418	int exynos_gem_get_pages_from_userptr(unsigned long start,
	419	unsigned int npages,
	420	struct page **pages,
	421	struct vm_area_struct *vma)
	422	{
	423	int get_npages;
	424
	425	/* the memory region mmaped with VM_PFNMAP. */
	426	if (vma_is_io(vma)) {
	427	unsigned int i;
	428
	429	for (i = 0; i < npages; ++i, start += PAGE_SIZE) {
	430	unsigned long pfn;
	431	int ret = follow_pfn(vma, start, &pfn);
	432	if (ret)
	433	return ret;
	434
	435	pages[i] = pfn_to_page(pfn);
	436	}
	437
	438	if (i != npages) {
	439	DRM_ERROR("failed to get user_pages.\n");
	440	return -EINVAL;
	441	}
	442
	443	return 0;
	444	}
445
446	get_npages = get_user_pages(current, current->mm, start,
447	npages, 1, 1, pages, NULL);
448	get_npages = max(get_npages, 0);
449	if (get_npages != npages) {
450	DRM_ERROR("failed to get user_pages.\n");
451	while (get_npages)
452	put_page(pages[--get_npages]);
453	return -EFAULT;
454	}
455
456	return 0;
457	}
458
459	void exynos_gem_put_pages_to_userptr(struct page **pages,
460	unsigned int npages,
461	struct vm_area_struct *vma)
462	{
463	if (!vma_is_io(vma)) {
464	unsigned int i;
465
466	for (i = 0; i < npages; i++) {
467	set_page_dirty_lock(pages[i]);
468
469	/*
470	* undo the reference we took when populating
471	* the table.
472	*/
473	put_page(pages[i]);
474	}
475	}
476	}
477
478	int exynos_gem_map_sgt_with_dma(struct drm_device *drm_dev,
479	struct sg_table *sgt,
480	enum dma_data_direction dir)
481	{
482	int nents;
483
484	mutex_lock(&drm_dev->struct_mutex);
485
486	nents = dma_map_sg(drm_dev->dev, sgt->sgl, sgt->nents, dir);
487	if (!nents) {
488	DRM_ERROR("failed to map sgl with dma.\n");
489	mutex_unlock(&drm_dev->struct_mutex);
490	return nents;
491	}
492
493	mutex_unlock(&drm_dev->struct_mutex);
494	return 0;
495	}
496
497	void exynos_gem_unmap_sgt_from_dma(struct drm_device *drm_dev,
498	struct sg_table *sgt,
499	enum dma_data_direction dir)
500	{
501	dma_unmap_sg(drm_dev->dev, sgt->sgl, sgt->nents, dir);
502	}
503
ee5e770e	504	void exynos_drm_gem_free_object(struct drm_gem_object *obj)
1c248b7d	505	{
b2df26c1 ID	506	struct exynos_drm_gem_obj *exynos_gem_obj;
	507	struct exynos_drm_gem_buf *buf;
	508
b2df26c1 ID	509	exynos_gem_obj = to_exynos_gem_obj(obj);
	510	buf = exynos_gem_obj->buffer;
	511
	512	if (obj->import_attach)
	513	drm_prime_gem_destroy(obj, buf->sgt);
	514
2364839a	515	exynos_drm_gem_destroy(to_exynos_gem_obj(obj));
1c248b7d ID	516	}
	517
	518	int exynos_drm_gem_dumb_create(struct drm_file *file_priv,
ee5e770e JS	519	struct drm_device *dev,
ee5e770e JS	520	struct drm_mode_create_dumb *args)
1c248b7d ID	521	{
1c248b7d ID	522	struct exynos_drm_gem_obj *exynos_gem_obj;
2364839a	523	int ret;
1c248b7d	524
1c248b7d	525	/*
c6b78bc8	526	* allocate memory to be used for framebuffer.
1c248b7d ID	527	* - this callback would be called by user application
	528	* with DRM_IOCTL_MODE_CREATE_DUMB command.
	529	*/
	530
3fd6b694	531	args->pitch = args->width * ((args->bpp + 7) / 8);
7da5907c	532	args->size = args->pitch * args->height;
1c248b7d	533
122beea8 RS	534	if (is_drm_iommu_supported(dev)) {
	535	exynos_gem_obj = exynos_drm_gem_create(dev,
	536	EXYNOS_BO_NONCONTIG \| EXYNOS_BO_WC,
	537	args->size);
	538	} else {
3fec4532	539	exynos_gem_obj = exynos_drm_gem_create(dev,
122beea8 RS	540	EXYNOS_BO_CONTIG \| EXYNOS_BO_WC,
122beea8 RS	541	args->size);
3fec4532 VS	542	}
3fec4532 VS	543
122beea8 RS	544	if (IS_ERR(exynos_gem_obj)) {
122beea8 RS	545	dev_warn(dev->dev, "FB allocation failed.\n");
1c248b7d	546	return PTR_ERR(exynos_gem_obj);
122beea8	547	}
1c248b7d	548
2364839a JS	549	ret = exynos_drm_gem_handle_create(&exynos_gem_obj->base, file_priv,
	550	&args->handle);
	551	if (ret) {
	552	exynos_drm_gem_destroy(exynos_gem_obj);
	553	return ret;
	554	}
	555
1c248b7d ID	556	return 0;
	557	}
	558
	559	int exynos_drm_gem_dumb_map_offset(struct drm_file *file_priv,
ee5e770e JS	560	struct drm_device *dev, uint32_t handle,
ee5e770e JS	561	uint64_t *offset)
1c248b7d	562	{
1c248b7d	563	struct drm_gem_object *obj;
2d91cf17	564	int ret = 0;
1c248b7d	565
1c248b7d ID	566	mutex_lock(&dev->struct_mutex);
	567
	568	/*
	569	* get offset of memory allocated for drm framebuffer.
	570	* - this callback would be called by user application
	571	* with DRM_IOCTL_MODE_MAP_DUMB command.
	572	*/
	573
	574	obj = drm_gem_object_lookup(dev, file_priv, handle);
	575	if (!obj) {
	576	DRM_ERROR("failed to lookup gem object.\n");
2d91cf17 JS	577	ret = -EINVAL;
2d91cf17 JS	578	goto unlock;
1c248b7d ID	579	}
1c248b7d ID	580
0de23977 DH	581	ret = drm_gem_create_mmap_offset(obj);
	582	if (ret)
	583	goto out;
1c248b7d	584
0de23977	585	*offset = drm_vma_node_offset_addr(&obj->vma_node);
1c248b7d ID	586	DRM_DEBUG_KMS("offset = 0x%lx\n", (unsigned long)*offset);
1c248b7d ID	587
2d91cf17 JS	588	out:
	589	drm_gem_object_unreference(obj);
	590	unlock:
1c248b7d	591	mutex_unlock(&dev->struct_mutex);
2d91cf17	592	return ret;
1c248b7d ID	593	}
	594
	595	int exynos_drm_gem_fault(struct vm_area_struct vma, struct vm_fault vmf)
	596	{
	597	struct drm_gem_object *obj = vma->vm_private_data;
1c248b7d	598	struct drm_device *dev = obj->dev;
2b35892e	599	unsigned long f_vaddr;
1c248b7d ID	600	pgoff_t page_offset;
	601	int ret;
	602
	603	page_offset = ((unsigned long)vmf->virtual_address -
	604	vma->vm_start) >> PAGE_SHIFT;
2b35892e	605	f_vaddr = (unsigned long)vmf->virtual_address;
1c248b7d ID	606
	607	mutex_lock(&dev->struct_mutex);
	608
0519f9a1	609	ret = exynos_drm_gem_map_buf(obj, vma, f_vaddr, page_offset);
2b35892e	610	if (ret < 0)
0519f9a1	611	DRM_ERROR("failed to map a buffer with user.\n");
1c248b7d ID	612
	613	mutex_unlock(&dev->struct_mutex);
	614
	615	return convert_to_vm_err_msg(ret);
	616	}
	617
	618	int exynos_drm_gem_mmap(struct file filp, struct vm_area_struct vma)
	619	{
c01d73fa ID	620	struct exynos_drm_gem_obj *exynos_gem_obj;
c01d73fa ID	621	struct drm_gem_object *obj;
1c248b7d ID	622	int ret;
1c248b7d ID	623
1c248b7d ID	624	/* set vm_area_struct. */
	625	ret = drm_gem_mmap(filp, vma);
	626	if (ret < 0) {
	627	DRM_ERROR("failed to mmap.\n");
	628	return ret;
	629	}
	630
c01d73fa ID	631	obj = vma->vm_private_data;
	632	exynos_gem_obj = to_exynos_gem_obj(obj);
	633
	634	ret = check_gem_flags(exynos_gem_obj->flags);
832316c7 ID	635	if (ret)
832316c7 ID	636	goto err_close_vm;
1c248b7d	637
c01d73fa ID	638	update_vm_cache_attr(exynos_gem_obj, vma);
c01d73fa ID	639
832316c7 ID	640	ret = exynos_drm_gem_mmap_buffer(exynos_gem_obj, vma);
	641	if (ret)
	642	goto err_close_vm;
	643
	644	return ret;
	645
	646	err_close_vm:
	647	drm_gem_vm_close(vma);
	648	drm_gem_free_mmap_offset(obj);
	649
1c248b7d ID	650	return ret;
1c248b7d ID	651	}