Release 4.11 drivers/gpu/drm/mediatek/mtk_drm_gem.c
/*
* Copyright (c) 2015 MediaTek Inc.
*
* 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.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <drm/drmP.h>
#include <drm/drm_gem.h>
#include <linux/dma-buf.h>
#include "mtk_drm_drv.h"
#include "mtk_drm_gem.h"
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);
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;
}
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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);
}
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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);
}
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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_unreference_unlocked(&mtk_gem->base);
return 0;
err_handle_create:
mtk_drm_gem_free_object(&mtk_gem->base);
return ret;
}
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int mtk_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;
obj = drm_gem_object_lookup(file_priv, handle);
if (!obj) {
DRM_ERROR("failed to lookup gem object.\n");
return -EINVAL;
}
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%llx\n", *offset);
out:
drm_gem_object_unreference_unlocked(obj);
return ret;
}
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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;
/*
* 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().
*/
vma->vm_flags &= ~VM_PFNMAP;
vma->vm_pgoff = 0;
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;
}
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int mtk_drm_gem_mmap_buf(struct drm_gem_object *obj, struct vm_area_struct *vma)
{
int ret;
ret = drm_gem_mmap_obj(obj, obj->size, vma);
if (ret)
return ret;
return mtk_drm_gem_object_mmap(obj, vma);
}
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int mtk_drm_gem_mmap(struct file *filp, struct vm_area_struct *vma)
{
struct drm_gem_object *obj;
int ret;
ret = drm_gem_mmap(filp, vma);
if (ret)
return ret;
obj = vma->vm_private_data;
return mtk_drm_gem_object_mmap(obj, vma);
}
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/*
* 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;
}
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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;
int ret;
struct scatterlist *s;
unsigned int i;
dma_addr_t expected;
mtk_gem = mtk_drm_gem_init(dev, attach->dmabuf->size);
if (IS_ERR(mtk_gem))
return ERR_PTR(PTR_ERR(mtk_gem));
expected = sg_dma_address(sg->sgl);
for_each_sg(sg->sgl, s, sg->nents, i) {
if (sg_dma_address(s) != expected) {
DRM_ERROR("sg_table is not contiguous");
ret = -EINVAL;
goto err_gem_free;
}
expected = sg_dma_address(s) + sg_dma_len(s);
}
mtk_gem->dma_addr = sg_dma_address(sg->sgl);
mtk_gem->sg = sg;
return &mtk_gem->base;
err_gem_free:
kfree(mtk_gem);
return ERR_PTR(ret);
}
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| Total | 1092 | 100.00% | 2 | 100.00% |
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