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/*
* Copyright 2017 Red Hat Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* 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.
*
* Authors: Jérôme Glisse <jglisse@redhat.com>
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/cdev.h>
#include <linux/slab.h>
#include <linux/fs.h>
#include <uapi/drm/compote-uapi.h>
#include "compote.h"
#include <nvif/driver.h>
#include <nvif/class.h>
#include "nouveau_ttm.h"
#include "nouveau_usif.h"
#include "nouveau_abi16.h"
#include "nouveau_bo.h"
static struct compote_mo *compote_file_mo_find(struct compote_file *cfile,
uint64_t foffset)
{
struct ttm_bo_device *bdev = &cfile->cdevice->nvdrm->ttm.bdev;
unsigned long pgoffset = foffset >> PAGE_SHIFT;
struct drm_vma_offset_node *node;
struct compote_mo *mo = NULL;
drm_vma_offset_lock_lookup(&bdev->vma_manager);
node = drm_vma_offset_lookup_locked(&bdev->vma_manager, pgoffset, 1);
if (likely(node)) {
struct ttm_buffer_object *bo;
struct nouveau_bo *nvbo;
bo = container_of(node, struct ttm_buffer_object, vma_node);
nvbo = nouveau_bo(bo);
mo = nvbo->mo;
if (!mo || mo->cfile != cfile || !kref_get_unless_zero(&mo->kref))
mo = NULL;
}
drm_vma_offset_unlock_lookup(&bdev->vma_manager);
return mo;
}
static int compote_mo_new(struct compote_mo **mop,
struct compote_file *cfile,
uint64_t nbytes)
{
uint32_t flags, tile_mode, tile_flags;
struct compote_mo *mo;
int align;
int ret;
mo = kzalloc(sizeof(*mo), GFP_KERNEL);
if (mo == NULL)
return -ENOMEM;
align = 0;
tile_mode = 0;
tile_flags = 0;
flags = TTM_PL_FLAG_TT;
ret = nouveau_bo_new(&cfile->nvclient, nbytes, align, flags, tile_mode,
tile_flags, NULL, NULL, &mo->nvbo);
if (ret)
goto error_bo;
mo->cfile = cfile;
mo->nvbo->mo = mo;
kref_init(&mo->kref);
INIT_LIST_HEAD(&mo->vas);
mo->npages = PAGE_ALIGN(nbytes);
mo->foffset = drm_vma_node_offset_addr(&mo->nvbo->bo.vma_node);
*mop = mo;
return 0;
error_bo:
kfree(mo);
*mop = NULL;
return ret;
}
static void compote_mo_kref_put(struct kref *kref)
{
struct compote_mo *mo = container_of(kref, struct compote_mo, kref);
struct ttm_buffer_object *bo = &mo->nvbo->bo;
ttm_bo_unref(&bo);
kfree(mo);
}
void compote_mo_ref(struct compote_mo *mo)
{
kref_get(&mo->kref);
}
void compote_mo_unref(struct compote_mo *mo)
{
kref_put(&mo->kref, compote_mo_kref_put);
}
long compote_ioctl_mem_alloc(struct compote_file *cfile, void __user *uarg)
{
struct compote_ioctl_mem_alloc arg;
struct compote_mo *mo = NULL;
int ret;
ret = copy_from_user(&arg, uarg, sizeof(arg));
if (ret)
return ret;
ret = compote_mo_new(&mo, cfile, arg.nbytes);
arg.foffset = ret ? -1UL : mo->foffset;
ret = copy_to_user(uarg, &arg, sizeof(arg));
if (ret) {
compote_mo_unref(mo);
return ret;
}
return 0;
}
long compote_ioctl_mem_free(struct compote_file *cfile, void __user *uarg)
{
struct compote_ioctl_mem_free arg;
struct compote_mo *mo = NULL;
int ret;
ret = copy_from_user(&arg, uarg, sizeof(arg));
if (ret)
return ret;
mo = compote_file_mo_find(cfile, arg.foffset);
if (mo == NULL)
return -EINVAL;
compote_mo_unref(mo);
compote_mo_unref(mo);
return 0;
}
static int compote_vm_fault(struct vm_fault *vmf)
{
struct compote_mo_va *mo_va = vmf->vma->vm_private_data;
struct ttm_buffer_object *bo;
int ret;
bo = &mo_va->mo->nvbo->bo;
vmf->vma->vm_private_data = bo;
ret = mo_va->ttm_vm_ops->fault(vmf);
vmf->vma->vm_private_data = mo_va;
return ret;
}
static void compote_vm_open(struct vm_area_struct *vma)
{
struct compote_mo_va *mo_va = vma->vm_private_data;
struct ttm_buffer_object *bo;
compote_mo_ref(mo_va->mo);
bo = &mo_va->mo->nvbo->bo;
vma->vm_private_data = bo;
mo_va->ttm_vm_ops->open(vma);
vma->vm_private_data = mo_va;
}
static void compote_vm_close(struct vm_area_struct *vma)
{
struct compote_mo_va *mo_va = vma->vm_private_data;
struct ttm_buffer_object *bo;
bo = &mo_va->mo->nvbo->bo;
vma->vm_private_data = bo;
mo_va->ttm_vm_ops->close(vma);
list_del_init(&mo_va->list);
vma->vm_private_data = NULL;
compote_mo_unref(mo_va->mo);
kfree(mo_va);
}
static const struct vm_operations_struct compote_vm_ops = {
.fault = compote_vm_fault,
.open = compote_vm_open,
.close = compote_vm_close
};
int compote_mo_mmap(struct compote_file *cfile,
struct vm_area_struct *vma,
struct file *file)
{
struct ttm_bo_device *bdev = &cfile->cdevice->nvdrm->ttm.bdev;
struct compote_mo_va *mo_va;
struct compote_mo *mo;
int ret;
mo = compote_file_mo_find(cfile, vma->vm_pgoff << PAGE_SHIFT);
if (mo == NULL)
return -EINVAL;
mo_va = kzalloc(sizeof(*mo_va), GFP_KERNEL);
if (mo_va == NULL)
return -ENOMEM;
mo_va->mo = mo;
mo_va->start = vma->vm_start;
mo_va->end = vma->vm_end;
mo_va->pgoffset = vma->vm_pgoff - (mo->foffset >> PAGE_SHIFT);
ret = ttm_bo_mmap(file, vma, bdev);
if (unlikely(ret != 0)) {
compote_mo_unref(mo);
kfree(mo_va);
return ret;
}
list_add_tail(&mo_va->list, &mo->vas);
mo_va->ttm_vm_ops = vma->vm_ops;
vma->vm_ops = &compote_vm_ops;
vma->vm_private_data = mo_va;
return 0;
}
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