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/*
* Copyright (C) 2015 Red Hat, Inc.
* All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice (including the
* next paragraph) shall be included in all copies or substantial
* portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#include "virtgpu_drv.h"
static int virtio_gpu_resource_id_get(struct virtio_gpu_device *vgdev,
uint32_t *resid)
{
#if 0
int handle = ida_alloc(&vgdev->resource_ida, GFP_KERNEL);
if (handle < 0)
return handle;
#else
static int handle;
/*
* FIXME: dirty hack to avoid re-using IDs, virglrenderer
* can't deal with that. Needs fixing in virglrenderer, also
* should figure a better way to handle that in the guest.
*/
handle++;
#endif
*resid = handle + 1;
return 0;
}
static void virtio_gpu_resource_id_put(struct virtio_gpu_device *vgdev, uint32_t id)
{
#if 0
ida_free(&vgdev->resource_ida, id - 1);
#endif
}
static void virtio_gpu_ttm_bo_destroy(struct ttm_buffer_object *tbo)
{
struct virtio_gpu_object *bo;
struct virtio_gpu_device *vgdev;
bo = container_of(tbo, struct virtio_gpu_object, tbo);
vgdev = (struct virtio_gpu_device *)bo->gem_base.dev->dev_private;
if (bo->created)
virtio_gpu_cmd_unref_resource(vgdev, bo->hw_res_handle);
if (bo->pages)
virtio_gpu_object_free_sg_table(bo);
if (bo->vmap)
virtio_gpu_object_kunmap(bo);
drm_gem_object_release(&bo->gem_base);
virtio_gpu_resource_id_put(vgdev, bo->hw_res_handle);
kfree(bo);
}
static void virtio_gpu_init_ttm_placement(struct virtio_gpu_object *vgbo,
bool pinned)
{
u32 c = 1;
u32 pflag = pinned ? TTM_PL_FLAG_NO_EVICT : 0;
vgbo->placement.placement = &vgbo->placement_code;
vgbo->placement.busy_placement = &vgbo->placement_code;
vgbo->placement_code.fpfn = 0;
vgbo->placement_code.lpfn = 0;
vgbo->placement_code.flags =
TTM_PL_MASK_CACHING | TTM_PL_FLAG_TT | pflag;
vgbo->placement.num_placement = c;
vgbo->placement.num_busy_placement = c;
}
int virtio_gpu_object_create(struct virtio_gpu_device *vgdev,
unsigned long size, bool kernel, bool pinned,
struct virtio_gpu_object **bo_ptr)
{
struct virtio_gpu_object *bo;
enum ttm_bo_type type;
size_t acc_size;
int ret;
if (kernel)
type = ttm_bo_type_kernel;
else
type = ttm_bo_type_device;
*bo_ptr = NULL;
acc_size = ttm_bo_dma_acc_size(&vgdev->mman.bdev, size,
sizeof(struct virtio_gpu_object));
bo = kzalloc(sizeof(struct virtio_gpu_object), GFP_KERNEL);
if (bo == NULL)
return -ENOMEM;
ret = virtio_gpu_resource_id_get(vgdev, &bo->hw_res_handle);
if (ret < 0) {
kfree(bo);
return ret;
}
size = roundup(size, PAGE_SIZE);
ret = drm_gem_object_init(vgdev->ddev, &bo->gem_base, size);
if (ret != 0) {
virtio_gpu_resource_id_put(vgdev, bo->hw_res_handle);
kfree(bo);
return ret;
}
bo->dumb = false;
virtio_gpu_init_ttm_placement(bo, pinned);
ret = ttm_bo_init(&vgdev->mman.bdev, &bo->tbo, size, type,
&bo->placement, 0, !kernel, acc_size,
NULL, NULL, &virtio_gpu_ttm_bo_destroy);
/* ttm_bo_init failure will call the destroy */
if (ret != 0)
return ret;
*bo_ptr = bo;
return 0;
}
void virtio_gpu_object_kunmap(struct virtio_gpu_object *bo)
{
bo->vmap = NULL;
ttm_bo_kunmap(&bo->kmap);
}
int virtio_gpu_object_kmap(struct virtio_gpu_object *bo)
{
bool is_iomem;
int r;
WARN_ON(bo->vmap);
r = ttm_bo_kmap(&bo->tbo, 0, bo->tbo.num_pages, &bo->kmap);
if (r)
return r;
bo->vmap = ttm_kmap_obj_virtual(&bo->kmap, &is_iomem);
return 0;
}
int virtio_gpu_object_get_sg_table(struct virtio_gpu_device *qdev,
struct virtio_gpu_object *bo)
{
int ret;
struct page **pages = bo->tbo.ttm->pages;
int nr_pages = bo->tbo.num_pages;
struct ttm_operation_ctx ctx = {
.interruptible = false,
.no_wait_gpu = false
};
/* wtf swapping */
if (bo->pages)
return 0;
if (bo->tbo.ttm->state == tt_unpopulated)
bo->tbo.ttm->bdev->driver->ttm_tt_populate(bo->tbo.ttm, &ctx);
bo->pages = kmalloc(sizeof(struct sg_table), GFP_KERNEL);
if (!bo->pages)
goto out;
ret = sg_alloc_table_from_pages(bo->pages, pages, nr_pages, 0,
nr_pages << PAGE_SHIFT, GFP_KERNEL);
if (ret)
goto out;
return 0;
out:
kfree(bo->pages);
bo->pages = NULL;
return -ENOMEM;
}
void virtio_gpu_object_free_sg_table(struct virtio_gpu_object *bo)
{
sg_free_table(bo->pages);
kfree(bo->pages);
bo->pages = NULL;
}
int virtio_gpu_object_wait(struct virtio_gpu_object *bo, bool no_wait)
{
int r;
r = ttm_bo_reserve(&bo->tbo, true, no_wait, NULL);
if (unlikely(r != 0))
return r;
r = ttm_bo_wait(&bo->tbo, true, no_wait);
ttm_bo_unreserve(&bo->tbo);
return r;
}
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