[linux-block.git] / drivers / gpu / drm / mediatek / mtk_drm_gem.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (c) 2015 MediaTek Inc.
 */

#include <linux/dma-buf.h>

#include <drm/drm.h>
#include <drm/drm_device.h>
#include <drm/drm_gem.h>
#include <drm/drm_gem_dma_helper.h>
#include <drm/drm_prime.h>

#include "mtk_drm_drv.h"
#include "mtk_drm_gem.h"

static int mtk_drm_gem_object_mmap(struct drm_gem_object *obj, struct vm_area_struct *vma);

static const struct drm_gem_object_funcs mtk_drm_gem_object_funcs = {
	.free = mtk_drm_gem_free_object,
	.get_sg_table = mtk_gem_prime_get_sg_table,
	.vmap = mtk_drm_gem_prime_vmap,
	.vunmap = mtk_drm_gem_prime_vunmap,
	.mmap = mtk_drm_gem_object_mmap,
	.vm_ops = &drm_gem_dma_vm_ops,
};

static struct mtk_drm_gem_obj *mtk_drm_gem_init(struct drm_device *dev,
						unsigned long size)
{
	struct mtk_drm_gem_obj *mtk_gem_obj;
	int ret;

	size = round_up(size, PAGE_SIZE);

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

	mtk_gem_obj->base.funcs = &mtk_drm_gem_object_funcs;

	ret = drm_gem_object_init(dev, &mtk_gem_obj->base, size);
	if (ret < 0) {
		DRM_ERROR("failed to initialize gem object\n");
		kfree(mtk_gem_obj);
		return ERR_PTR(ret);
	}

	return mtk_gem_obj;
}

struct mtk_drm_gem_obj *mtk_drm_gem_create(struct drm_device *dev,
					   size_t size, bool alloc_kmap)
{
	struct mtk_drm_private *priv = dev->dev_private;
	struct mtk_drm_gem_obj *mtk_gem;
	struct drm_gem_object *obj;
	int ret;

	mtk_gem = mtk_drm_gem_init(dev, size);
	if (IS_ERR(mtk_gem))
		return ERR_CAST(mtk_gem);

	obj = &mtk_gem->base;

	mtk_gem->dma_attrs = DMA_ATTR_WRITE_COMBINE;

	if (!alloc_kmap)
		mtk_gem->dma_attrs |= DMA_ATTR_NO_KERNEL_MAPPING;

	mtk_gem->cookie = dma_alloc_attrs(priv->dma_dev, obj->size,
					  &mtk_gem->dma_addr, GFP_KERNEL,
					  mtk_gem->dma_attrs);
	if (!mtk_gem->cookie) {
		DRM_ERROR("failed to allocate %zx byte dma buffer", obj->size);
		ret = -ENOMEM;
		goto err_gem_free;
	}

	if (alloc_kmap)
		mtk_gem->kvaddr = mtk_gem->cookie;

	DRM_DEBUG_DRIVER("cookie = %p dma_addr = %pad size = %zu\n",
			 mtk_gem->cookie, &mtk_gem->dma_addr,
			 size);

	return mtk_gem;

err_gem_free:
	drm_gem_object_release(obj);
	kfree(mtk_gem);
	return ERR_PTR(ret);
}

void mtk_drm_gem_free_object(struct drm_gem_object *obj)
{
	struct mtk_drm_gem_obj *mtk_gem = to_mtk_gem_obj(obj);
	struct mtk_drm_private *priv = obj->dev->dev_private;

	if (mtk_gem->sg)
		drm_prime_gem_destroy(obj, mtk_gem->sg);
	else
		dma_free_attrs(priv->dma_dev, obj->size, mtk_gem->cookie,
			       mtk_gem->dma_addr, mtk_gem->dma_attrs);

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

	kfree(mtk_gem);
}

int mtk_drm_gem_dumb_create(struct drm_file *file_priv, struct drm_device *dev,
			    struct drm_mode_create_dumb *args)
{
	struct mtk_drm_gem_obj *mtk_gem;
	int ret;

	args->pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
	args->size = args->pitch * args->height;

	mtk_gem = mtk_drm_gem_create(dev, args->size, false);
	if (IS_ERR(mtk_gem))
		return PTR_ERR(mtk_gem);

	/*
	 * 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, &mtk_gem->base, &args->handle);
	if (ret)
		goto err_handle_create;

	/* drop reference from allocate - handle holds it now. */
	drm_gem_object_put(&mtk_gem->base);

	return 0;

err_handle_create:
	mtk_drm_gem_free_object(&mtk_gem->base);
	return ret;
}

static int mtk_drm_gem_object_mmap(struct drm_gem_object *obj,
				   struct vm_area_struct *vma)

{
	int ret;
	struct mtk_drm_gem_obj *mtk_gem = to_mtk_gem_obj(obj);
	struct mtk_drm_private *priv = obj->dev->dev_private;

	/*
	 * Set vm_pgoff (used as a fake buffer offset by DRM) to 0 and map the
	 * whole buffer from the start.
	 */
	vma->vm_pgoff = 0;

	/*
	 * dma_alloc_attrs() allocated a struct page table for mtk_gem, so clear
	 * VM_PFNMAP flag that was set by drm_gem_mmap_obj()/drm_gem_mmap().
	 */
	vm_flags_set(vma, VM_IO | VM_DONTEXPAND | VM_DONTDUMP);
	vma->vm_page_prot = pgprot_writecombine(vm_get_page_prot(vma->vm_flags));
	vma->vm_page_prot = pgprot_decrypted(vma->vm_page_prot);

	ret = dma_mmap_attrs(priv->dma_dev, vma, mtk_gem->cookie,
			     mtk_gem->dma_addr, obj->size, mtk_gem->dma_attrs);
	if (ret)
		drm_gem_vm_close(vma);

	return ret;
}

/*
 * Allocate a sg_table for this GEM object.
 * Note: Both the table's contents, and the sg_table itself must be freed by
 *       the caller.
 * Returns a pointer to the newly allocated sg_table, or an ERR_PTR() error.
 */
struct sg_table *mtk_gem_prime_get_sg_table(struct drm_gem_object *obj)
{
	struct mtk_drm_gem_obj *mtk_gem = to_mtk_gem_obj(obj);
	struct mtk_drm_private *priv = obj->dev->dev_private;
	struct sg_table *sgt;
	int ret;

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

	ret = dma_get_sgtable_attrs(priv->dma_dev, sgt, mtk_gem->cookie,
				    mtk_gem->dma_addr, obj->size,
				    mtk_gem->dma_attrs);
	if (ret) {
		DRM_ERROR("failed to allocate sgt, %d\n", ret);
		kfree(sgt);
		return ERR_PTR(ret);
	}

	return sgt;
}

struct drm_gem_object *mtk_gem_prime_import_sg_table(struct drm_device *dev,
			struct dma_buf_attachment *attach, struct sg_table *sg)
{
	struct mtk_drm_gem_obj *mtk_gem;

	/* check if the entries in the sg_table are contiguous */
	if (drm_prime_get_contiguous_size(sg) < attach->dmabuf->size) {
		DRM_ERROR("sg_table is not contiguous");
		return ERR_PTR(-EINVAL);
	}

	mtk_gem = mtk_drm_gem_init(dev, attach->dmabuf->size);
	if (IS_ERR(mtk_gem))
		return ERR_CAST(mtk_gem);

	mtk_gem->dma_addr = sg_dma_address(sg->sgl);
	mtk_gem->sg = sg;

	return &mtk_gem->base;
}

int mtk_drm_gem_prime_vmap(struct drm_gem_object *obj, struct iosys_map *map)
{
	struct mtk_drm_gem_obj *mtk_gem = to_mtk_gem_obj(obj);
	struct sg_table *sgt = NULL;
	unsigned int npages;

	if (mtk_gem->kvaddr)
		goto out;

	sgt = mtk_gem_prime_get_sg_table(obj);
	if (IS_ERR(sgt))
		return PTR_ERR(sgt);

	npages = obj->size >> PAGE_SHIFT;
	mtk_gem->pages = kcalloc(npages, sizeof(*mtk_gem->pages), GFP_KERNEL);
	if (!mtk_gem->pages) {
		kfree(sgt);
		return -ENOMEM;
	}

	drm_prime_sg_to_page_array(sgt, mtk_gem->pages, npages);

	mtk_gem->kvaddr = vmap(mtk_gem->pages, npages, VM_MAP,
			       pgprot_writecombine(PAGE_KERNEL));

out:
	kfree(sgt);
	iosys_map_set_vaddr(map, mtk_gem->kvaddr);

	return 0;
}

void mtk_drm_gem_prime_vunmap(struct drm_gem_object *obj,
			      struct iosys_map *map)
{
	struct mtk_drm_gem_obj *mtk_gem = to_mtk_gem_obj(obj);
	void *vaddr = map->vaddr;

	if (!mtk_gem->pages)
		return;

	vunmap(vaddr);
	mtk_gem->kvaddr = 0;
	kfree(mtk_gem->pages);
}
Commit	Line	Data
1802d0be	1	// SPDX-License-Identifier: GPL-2.0-only
119f5173 CH	2	/*
119f5173 CH	3	* Copyright (c) 2015 MediaTek Inc.
119f5173 CH	4	*/
119f5173 CH	5
119f5173 CH	6	#include <linux/dma-buf.h>
119f5173 CH	7
1eef08cb	8	#include <drm/drm.h>
9aef5867 SR	9	#include <drm/drm_device.h>
9aef5867 SR	10	#include <drm/drm_gem.h>
4a83c26a	11	#include <drm/drm_gem_dma_helper.h>
9aef5867 SR	12	#include <drm/drm_prime.h>
9aef5867 SR	13
119f5173 CH	14	#include "mtk_drm_drv.h"
	15	#include "mtk_drm_gem.h"
	16
500007eb TZ	17	static int mtk_drm_gem_object_mmap(struct drm_gem_object obj, struct vm_area_struct vma);
500007eb TZ	18
84274de6 TZ	19	static const struct drm_gem_object_funcs mtk_drm_gem_object_funcs = {
	20	.free = mtk_drm_gem_free_object,
	21	.get_sg_table = mtk_gem_prime_get_sg_table,
	22	.vmap = mtk_drm_gem_prime_vmap,
	23	.vunmap = mtk_drm_gem_prime_vunmap,
500007eb	24	.mmap = mtk_drm_gem_object_mmap,
4a83c26a	25	.vm_ops = &drm_gem_dma_vm_ops,
84274de6 TZ	26	};
84274de6 TZ	27
119f5173 CH	28	static struct mtk_drm_gem_obj mtk_drm_gem_init(struct drm_device dev,
	29	unsigned long size)
	30	{
	31	struct mtk_drm_gem_obj *mtk_gem_obj;
	32	int ret;
	33
	34	size = round_up(size, PAGE_SIZE);
	35
	36	mtk_gem_obj = kzalloc(sizeof(*mtk_gem_obj), GFP_KERNEL);
	37	if (!mtk_gem_obj)
	38	return ERR_PTR(-ENOMEM);
	39
84274de6 TZ	40	mtk_gem_obj->base.funcs = &mtk_drm_gem_object_funcs;
84274de6 TZ	41
119f5173 CH	42	ret = drm_gem_object_init(dev, &mtk_gem_obj->base, size);
	43	if (ret < 0) {
	44	DRM_ERROR("failed to initialize gem object\n");
	45	kfree(mtk_gem_obj);
	46	return ERR_PTR(ret);
	47	}
	48
	49	return mtk_gem_obj;
	50	}
	51
	52	struct mtk_drm_gem_obj mtk_drm_gem_create(struct drm_device dev,
	53	size_t size, bool alloc_kmap)
	54	{
	55	struct mtk_drm_private *priv = dev->dev_private;
	56	struct mtk_drm_gem_obj *mtk_gem;
	57	struct drm_gem_object *obj;
	58	int ret;
	59
	60	mtk_gem = mtk_drm_gem_init(dev, size);
	61	if (IS_ERR(mtk_gem))
	62	return ERR_CAST(mtk_gem);
	63
	64	obj = &mtk_gem->base;
	65
00085f1e	66	mtk_gem->dma_attrs = DMA_ATTR_WRITE_COMBINE;
119f5173 CH	67
119f5173 CH	68	if (!alloc_kmap)
00085f1e	69	mtk_gem->dma_attrs \|= DMA_ATTR_NO_KERNEL_MAPPING;
119f5173 CH	70
	71	mtk_gem->cookie = dma_alloc_attrs(priv->dma_dev, obj->size,
	72	&mtk_gem->dma_addr, GFP_KERNEL,
00085f1e	73	mtk_gem->dma_attrs);
119f5173 CH	74	if (!mtk_gem->cookie) {
	75	DRM_ERROR("failed to allocate %zx byte dma buffer", obj->size);
	76	ret = -ENOMEM;
	77	goto err_gem_free;
	78	}
	79
	80	if (alloc_kmap)
	81	mtk_gem->kvaddr = mtk_gem->cookie;
	82
	83	DRM_DEBUG_DRIVER("cookie = %p dma_addr = %pad size = %zu\n",
	84	mtk_gem->cookie, &mtk_gem->dma_addr,
	85	size);
	86
	87	return mtk_gem;
	88
	89	err_gem_free:
	90	drm_gem_object_release(obj);
	91	kfree(mtk_gem);
	92	return ERR_PTR(ret);
	93	}
	94
	95	void mtk_drm_gem_free_object(struct drm_gem_object *obj)
	96	{
	97	struct mtk_drm_gem_obj *mtk_gem = to_mtk_gem_obj(obj);
	98	struct mtk_drm_private *priv = obj->dev->dev_private;
	99
	100	if (mtk_gem->sg)
	101	drm_prime_gem_destroy(obj, mtk_gem->sg);
	102	else
	103	dma_free_attrs(priv->dma_dev, obj->size, mtk_gem->cookie,
00085f1e	104	mtk_gem->dma_addr, mtk_gem->dma_attrs);
119f5173 CH	105
	106	/* release file pointer to gem object. */
	107	drm_gem_object_release(obj);
	108
	109	kfree(mtk_gem);
	110	}
	111
	112	int mtk_drm_gem_dumb_create(struct drm_file file_priv, struct drm_device dev,
	113	struct drm_mode_create_dumb *args)
	114	{
	115	struct mtk_drm_gem_obj *mtk_gem;
	116	int ret;
	117
	118	args->pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
	119	args->size = args->pitch * args->height;
	120
	121	mtk_gem = mtk_drm_gem_create(dev, args->size, false);
	122	if (IS_ERR(mtk_gem))
	123	return PTR_ERR(mtk_gem);
	124
	125	/*
	126	* allocate a id of idr table where the obj is registered
	127	* and handle has the id what user can see.
	128	*/
	129	ret = drm_gem_handle_create(file_priv, &mtk_gem->base, &args->handle);
	130	if (ret)
	131	goto err_handle_create;
	132
	133	/* drop reference from allocate - handle holds it now. */
556372df	134	drm_gem_object_put(&mtk_gem->base);
119f5173 CH	135
	136	return 0;
	137
	138	err_handle_create:
	139	mtk_drm_gem_free_object(&mtk_gem->base);
	140	return ret;
	141	}
	142
119f5173 CH	143	static int mtk_drm_gem_object_mmap(struct drm_gem_object *obj,
	144	struct vm_area_struct *vma)
	145
	146	{
	147	int ret;
	148	struct mtk_drm_gem_obj *mtk_gem = to_mtk_gem_obj(obj);
	149	struct mtk_drm_private *priv = obj->dev->dev_private;
	150
500007eb TZ	151	/*
	152	* Set vm_pgoff (used as a fake buffer offset by DRM) to 0 and map the
	153	* whole buffer from the start.
	154	*/
	155	vma->vm_pgoff = 0;
	156
119f5173 CH	157	/*
	158	* dma_alloc_attrs() allocated a struct page table for mtk_gem, so clear
	159	* VM_PFNMAP flag that was set by drm_gem_mmap_obj()/drm_gem_mmap().
	160	*/
1c71222e	161	vm_flags_set(vma, VM_IO \| VM_DONTEXPAND \| VM_DONTDUMP);
500007eb TZ	162	vma->vm_page_prot = pgprot_writecombine(vm_get_page_prot(vma->vm_flags));
500007eb TZ	163	vma->vm_page_prot = pgprot_decrypted(vma->vm_page_prot);
119f5173 CH	164
119f5173 CH	165	ret = dma_mmap_attrs(priv->dma_dev, vma, mtk_gem->cookie,
00085f1e	166	mtk_gem->dma_addr, obj->size, mtk_gem->dma_attrs);
119f5173 CH	167	if (ret)
	168	drm_gem_vm_close(vma);
	169
	170	return ret;
	171	}
	172
119f5173 CH	173	/*
	174	* Allocate a sg_table for this GEM object.
	175	* Note: Both the table's contents, and the sg_table itself must be freed by
	176	* the caller.
	177	* Returns a pointer to the newly allocated sg_table, or an ERR_PTR() error.
	178	*/
	179	struct sg_table mtk_gem_prime_get_sg_table(struct drm_gem_object obj)
	180	{
	181	struct mtk_drm_gem_obj *mtk_gem = to_mtk_gem_obj(obj);
	182	struct mtk_drm_private *priv = obj->dev->dev_private;
	183	struct sg_table *sgt;
	184	int ret;
	185
	186	sgt = kzalloc(sizeof(*sgt), GFP_KERNEL);
	187	if (!sgt)
	188	return ERR_PTR(-ENOMEM);
	189
	190	ret = dma_get_sgtable_attrs(priv->dma_dev, sgt, mtk_gem->cookie,
	191	mtk_gem->dma_addr, obj->size,
00085f1e	192	mtk_gem->dma_attrs);
119f5173 CH	193	if (ret) {
	194	DRM_ERROR("failed to allocate sgt, %d\n", ret);
	195	kfree(sgt);
	196	return ERR_PTR(ret);
	197	}
	198
	199	return sgt;
	200	}
	201
	202	struct drm_gem_object mtk_gem_prime_import_sg_table(struct drm_device dev,
	203	struct dma_buf_attachment attach, struct sg_table sg)
	204	{
	205	struct mtk_drm_gem_obj *mtk_gem;
119f5173	206
960db7fc MS	207	/* check if the entries in the sg_table are contiguous */
	208	if (drm_prime_get_contiguous_size(sg) < attach->dmabuf->size) {
	209	DRM_ERROR("sg_table is not contiguous");
	210	return ERR_PTR(-EINVAL);
	211	}
119f5173	212
960db7fc	213	mtk_gem = mtk_drm_gem_init(dev, attach->dmabuf->size);
119f5173	214	if (IS_ERR(mtk_gem))
1e109115	215	return ERR_CAST(mtk_gem);
119f5173	216
119f5173 CH	217	mtk_gem->dma_addr = sg_dma_address(sg->sgl);
	218	mtk_gem->sg = sg;
	219
	220	return &mtk_gem->base;
119f5173	221	}
3df64d7b	222
7938f421	223	int mtk_drm_gem_prime_vmap(struct drm_gem_object obj, struct iosys_map map)
3df64d7b CH	224	{
3df64d7b CH	225	struct mtk_drm_gem_obj *mtk_gem = to_mtk_gem_obj(obj);
7e542ff8	226	struct sg_table *sgt = NULL;
3df64d7b	227	unsigned int npages;
3df64d7b CH	228
3df64d7b CH	229	if (mtk_gem->kvaddr)
7e542ff8	230	goto out;
3df64d7b CH	231
	232	sgt = mtk_gem_prime_get_sg_table(obj);
	233	if (IS_ERR(sgt))
7e542ff8	234	return PTR_ERR(sgt);
3df64d7b CH	235
	236	npages = obj->size >> PAGE_SHIFT;
	237	mtk_gem->pages = kcalloc(npages, sizeof(*mtk_gem->pages), GFP_KERNEL);
7e542ff8 TZ	238	if (!mtk_gem->pages) {
	239	kfree(sgt);
	240	return -ENOMEM;
	241	}
3df64d7b	242
c67e6279	243	drm_prime_sg_to_page_array(sgt, mtk_gem->pages, npages);
90dcf444	244
3df64d7b CH	245	mtk_gem->kvaddr = vmap(mtk_gem->pages, npages, VM_MAP,
	246	pgprot_writecombine(PAGE_KERNEL));
	247
	248	out:
2ec35bd2	249	kfree(sgt);
7938f421	250	iosys_map_set_vaddr(map, mtk_gem->kvaddr);
3df64d7b	251
7e542ff8	252	return 0;
3df64d7b CH	253	}
3df64d7b CH	254
7938f421 LDM	255	void mtk_drm_gem_prime_vunmap(struct drm_gem_object *obj,
7938f421 LDM	256	struct iosys_map *map)
3df64d7b CH	257	{
3df64d7b CH	258	struct mtk_drm_gem_obj *mtk_gem = to_mtk_gem_obj(obj);
7e542ff8	259	void *vaddr = map->vaddr;
3df64d7b CH	260
	261	if (!mtk_gem->pages)
	262	return;
	263
	264	vunmap(vaddr);
	265	mtk_gem->kvaddr = 0;
2ec35bd2	266	kfree(mtk_gem->pages);
3df64d7b	267	}