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// SPDX-License-Identifier: GPL-2.0+
#include <linux/shmem_fs.h>
#include "vkms_drv.h"
static struct vkms_gem_object *__vkms_gem_create(struct drm_device *dev,
u64 size)
{
struct vkms_gem_object *obj;
int ret;
obj = kzalloc(sizeof(*obj), GFP_KERNEL);
if (!obj)
return ERR_PTR(-ENOMEM);
size = roundup(size, PAGE_SIZE);
ret = drm_gem_object_init(dev, &obj->gem, size);
if (ret) {
kfree(obj);
return ERR_PTR(ret);
}
mutex_init(&obj->pages_lock);
return obj;
}
void vkms_gem_free_object(struct drm_gem_object *obj)
{
struct vkms_gem_object *gem = container_of(obj, struct vkms_gem_object,
gem);
kvfree(gem->pages);
mutex_destroy(&gem->pages_lock);
drm_gem_object_release(obj);
kfree(gem);
}
int vkms_gem_fault(struct vm_fault *vmf)
{
struct vm_area_struct *vma = vmf->vma;
struct vkms_gem_object *obj = vma->vm_private_data;
unsigned long vaddr = vmf->address;
pgoff_t page_offset;
loff_t num_pages;
int ret;
page_offset = (vaddr - vma->vm_start) >> PAGE_SHIFT;
num_pages = DIV_ROUND_UP(obj->gem.size, PAGE_SIZE);
if (page_offset > num_pages)
return VM_FAULT_SIGBUS;
ret = -ENOENT;
mutex_lock(&obj->pages_lock);
if (obj->pages) {
get_page(obj->pages[page_offset]);
vmf->page = obj->pages[page_offset];
ret = 0;
}
mutex_unlock(&obj->pages_lock);
if (ret) {
struct page *page;
struct address_space *mapping;
mapping = file_inode(obj->gem.filp)->i_mapping;
page = shmem_read_mapping_page(mapping, page_offset);
if (!IS_ERR(page)) {
vmf->page = page;
ret = 0;
} else {
switch (PTR_ERR(page)) {
case -ENOSPC:
case -ENOMEM:
ret = VM_FAULT_OOM;
break;
case -EBUSY:
ret = VM_FAULT_RETRY;
break;
case -EFAULT:
case -EINVAL:
ret = VM_FAULT_SIGBUS;
break;
default:
WARN_ON(PTR_ERR(page));
ret = VM_FAULT_SIGBUS;
break;
}
}
}
return ret;
}
static struct drm_gem_object *vkms_gem_create(struct drm_device *dev,
struct drm_file *file,
u32 *handle,
u64 size)
{
struct vkms_gem_object *obj;
int ret;
if (!file || !dev || !handle)
return ERR_PTR(-EINVAL);
obj = __vkms_gem_create(dev, size);
if (IS_ERR(obj))
return ERR_CAST(obj);
ret = drm_gem_handle_create(file, &obj->gem, handle);
if (ret)
return ERR_PTR(ret);
return &obj->gem;
}
int vkms_dumb_create(struct drm_file *file, struct drm_device *dev,
struct drm_mode_create_dumb *args)
{
struct drm_gem_object *gem_obj;
u64 pitch, size;
if (!args || !dev || !file)
return -EINVAL;
pitch = args->width * DIV_ROUND_UP(args->bpp, 8);
size = pitch * args->height;
if (!size)
return -EINVAL;
gem_obj = vkms_gem_create(dev, file, &args->handle, size);
if (IS_ERR(gem_obj))
return PTR_ERR(gem_obj);
args->size = gem_obj->size;
args->pitch = pitch;
drm_gem_object_put_unlocked(gem_obj);
DRM_DEBUG_DRIVER("Created object of size %lld\n", size);
return 0;
}
int vkms_dumb_map(struct drm_file *file, struct drm_device *dev,
u32 handle, u64 *offset)
{
struct drm_gem_object *obj;
int ret;
obj = drm_gem_object_lookup(file, handle);
if (!obj)
return -ENOENT;
if (!obj->filp) {
ret = -EINVAL;
goto unref;
}
ret = drm_gem_create_mmap_offset(obj);
if (ret)
goto unref;
*offset = drm_vma_node_offset_addr(&obj->vma_node);
unref:
drm_gem_object_put_unlocked(obj);
return ret;
}
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