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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2012 Red Hat
*/
#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;
}
obj->flags = UDL_BO_CACHEABLE;
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_put_unlocked(&obj->base);
*handle_p = handle;
return 0;
}
static void update_vm_cache_attr(struct udl_gem_object *obj,
struct vm_area_struct *vma)
{
DRM_DEBUG_KMS("flags = 0x%x\n", obj->flags);
/* non-cacheable as default. */
if (obj->flags & UDL_BO_CACHEABLE) {
vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
} else if (obj->flags & UDL_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));
}
}
int udl_dumb_create(struct drm_file *file,
struct drm_device *dev,
struct drm_mode_create_dumb *args)
{
args->pitch = args->width * DIV_ROUND_UP(args->bpp, 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;
update_vm_cache_attr(to_udl_bo(vma->vm_private_data), vma);
return ret;
}
vm_fault_t udl_gem_fault(struct vm_fault *vmf)
{
struct vm_area_struct *vma = vmf->vma;
struct udl_gem_object *obj = to_udl_bo(vma->vm_private_data);
struct page *page;
unsigned int page_offset;
page_offset = (vmf->address - vma->vm_start) >> PAGE_SHIFT;
if (!obj->pages)
return VM_FAULT_SIGBUS;
page = obj->pages[page_offset];
return vmf_insert_page(vma, vmf->address, page);
}
int udl_gem_get_pages(struct udl_gem_object *obj)
{
struct page **pages;
if (obj->pages)
return 0;
pages = drm_gem_get_pages(&obj->base);
if (IS_ERR(pages))
return PTR_ERR(pages);
obj->pages = pages;
return 0;
}
void udl_gem_put_pages(struct udl_gem_object *obj)
{
if (obj->base.import_attach) {
kvfree(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);
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;
}
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);
put_device(gem_obj->dev->dev);
}
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;
struct udl_device *udl = to_udl(dev);
int ret = 0;
mutex_lock(&udl->gem_lock);
obj = drm_gem_object_lookup(file, handle);
if (obj == NULL) {
ret = -ENOENT;
goto unlock;
}
gobj = to_udl_bo(obj);
ret = udl_gem_get_pages(gobj);
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_put_unlocked(&gobj->base);
unlock:
mutex_unlock(&udl->gem_lock);
return ret;
}
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