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/*
* Copyright (C) 2012 Red Hat
*
* This file is subject to the terms and conditions of the GNU General Public
* License v2. See the file COPYING in the main directory of this archive for
* more details.
*/
#include <drm/drmP.h>
#include "udl_drv.h"
#include <linux/shmem_fs.h>
#include <linux/dma-buf.h>
struct udl_gem_object *udl_gem_alloc_object(struct drm_device *dev,
size_t size)
{
struct udl_gem_object *obj;
obj = kzalloc(sizeof(*obj), GFP_KERNEL);
if (obj == NULL)
return NULL;
if (drm_gem_object_init(dev, &obj->base, size) != 0) {
kfree(obj);
return NULL;
}
return obj;
}
static int
udl_gem_create(struct drm_file *file,
struct drm_device *dev,
uint64_t size,
uint32_t *handle_p)
{
struct udl_gem_object *obj;
int ret;
u32 handle;
size = roundup(size, PAGE_SIZE);
obj = udl_gem_alloc_object(dev, size);
if (obj == NULL)
return -ENOMEM;
ret = drm_gem_handle_create(file, &obj->base, &handle);
if (ret) {
drm_gem_object_release(&obj->base);
kfree(obj);
return ret;
}
drm_gem_object_unreference(&obj->base);
*handle_p = handle;
return 0;
}
int udl_dumb_create(struct drm_file *file,
struct drm_device *dev,
struct drm_mode_create_dumb *args)
{
args->pitch = args->width * ((args->bpp + 1) / 8);
args->size = args->pitch * args->height;
return udl_gem_create(file, dev,
args->size, &args->handle);
}
int udl_drm_gem_mmap(struct file *filp, struct vm_area_struct *vma)
{
int ret;
ret = drm_gem_mmap(filp, vma);
if (ret)
return ret;
vma->vm_flags &= ~VM_PFNMAP;
vma->vm_flags |= VM_MIXEDMAP;
return ret;
}
int udl_gem_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
{
struct udl_gem_object *obj = to_udl_bo(vma->vm_private_data);
struct page *page;
unsigned int page_offset;
int ret = 0;
page_offset = ((unsigned long)vmf->virtual_address - vma->vm_start) >>
PAGE_SHIFT;
if (!obj->pages)
return VM_FAULT_SIGBUS;
page = obj->pages[page_offset];
ret = vm_insert_page(vma, (unsigned long)vmf->virtual_address, page);
switch (ret) {
case -EAGAIN:
case 0:
case -ERESTARTSYS:
return VM_FAULT_NOPAGE;
case -ENOMEM:
return VM_FAULT_OOM;
default:
return VM_FAULT_SIGBUS;
}
}
int udl_gem_init_object(struct drm_gem_object *obj)
{
BUG();
return 0;
}
static int udl_gem_get_pages(struct udl_gem_object *obj, gfp_t gfpmask)
{
struct page **pages;
if (obj->pages)
return 0;
pages = drm_gem_get_pages(&obj->base, gfpmask);
if (IS_ERR(pages))
return PTR_ERR(pages);
obj->pages = pages;
return 0;
}
static void udl_gem_put_pages(struct udl_gem_object *obj)
{
if (obj->base.import_attach) {
drm_free_large(obj->pages);
obj->pages = NULL;
return;
}
drm_gem_put_pages(&obj->base, obj->pages, false, false);
obj->pages = NULL;
}
int udl_gem_vmap(struct udl_gem_object *obj)
{
int page_count = obj->base.size / PAGE_SIZE;
int ret;
if (obj->base.import_attach) {
obj->vmapping = dma_buf_vmap(obj->base.import_attach->dmabuf);
if (!obj->vmapping)
return -ENOMEM;
return 0;
}
ret = udl_gem_get_pages(obj, GFP_KERNEL);
if (ret)
return ret;
obj->vmapping = vmap(obj->pages, page_count, 0, PAGE_KERNEL);
if (!obj->vmapping)
return -ENOMEM;
return 0;
}
void udl_gem_vunmap(struct udl_gem_object *obj)
{
if (obj->base.import_attach) {
dma_buf_vunmap(obj->base.import_attach->dmabuf, obj->vmapping);
return;
}
if (obj->vmapping)
vunmap(obj->vmapping);
udl_gem_put_pages(obj);
}
void udl_gem_free_object(struct drm_gem_object *gem_obj)
{
struct udl_gem_object *obj = to_udl_bo(gem_obj);
if (obj->vmapping)
udl_gem_vunmap(obj);
if (gem_obj->import_attach)
drm_prime_gem_destroy(gem_obj, obj->sg);
if (obj->pages)
udl_gem_put_pages(obj);
drm_gem_free_mmap_offset(gem_obj);
}
/* the dumb interface doesn't work with the GEM straight MMAP
interface, it expects to do MMAP on the drm fd, like normal */
int udl_gem_mmap(struct drm_file *file, struct drm_device *dev,
uint32_t handle, uint64_t *offset)
{
struct udl_gem_object *gobj;
struct drm_gem_object *obj;
int ret = 0;
mutex_lock(&dev->struct_mutex);
obj = drm_gem_object_lookup(dev, file, handle);
if (obj == NULL) {
ret = -ENOENT;
goto unlock;
}
gobj = to_udl_bo(obj);
ret = udl_gem_get_pages(gobj, GFP_KERNEL);
if (ret)
goto out;
ret = drm_gem_create_mmap_offset(obj);
if (ret)
goto out;
*offset = drm_vma_node_offset_addr(&gobj->base.vma_node);
out:
drm_gem_object_unreference(&gobj->base);
unlock:
mutex_unlock(&dev->struct_mutex);
return ret;
}
static int udl_prime_create(struct drm_device *dev,
size_t size,
struct sg_table *sg,
struct udl_gem_object **obj_p)
{
struct udl_gem_object *obj;
int npages;
npages = size / PAGE_SIZE;
*obj_p = NULL;
obj = udl_gem_alloc_object(dev, npages * PAGE_SIZE);
if (!obj)
return -ENOMEM;
obj->sg = sg;
obj->pages = drm_malloc_ab(npages, sizeof(struct page *));
if (obj->pages == NULL) {
DRM_ERROR("obj pages is NULL %d\n", npages);
return -ENOMEM;
}
drm_prime_sg_to_page_addr_arrays(sg, obj->pages, NULL, npages);
*obj_p = obj;
return 0;
}
struct drm_gem_object *udl_gem_prime_import(struct drm_device *dev,
struct dma_buf *dma_buf)
{
struct dma_buf_attachment *attach;
struct sg_table *sg;
struct udl_gem_object *uobj;
int ret;
/* need to attach */
attach = dma_buf_attach(dma_buf, dev->dev);
if (IS_ERR(attach))
return ERR_CAST(attach);
get_dma_buf(dma_buf);
sg = dma_buf_map_attachment(attach, DMA_BIDIRECTIONAL);
if (IS_ERR(sg)) {
ret = PTR_ERR(sg);
goto fail_detach;
}
ret = udl_prime_create(dev, dma_buf->size, sg, &uobj);
if (ret) {
goto fail_unmap;
}
uobj->base.import_attach = attach;
return &uobj->base;
fail_unmap:
dma_buf_unmap_attachment(attach, sg, DMA_BIDIRECTIONAL);
fail_detach:
dma_buf_detach(dma_buf, attach);
dma_buf_put(dma_buf);
return ERR_PTR(ret);
}
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