- 根目录:
- drivers
- gpu
- drm
- virtio
- virtgpu_ttm.c
/*
* Copyright (C) 2015 Red Hat, Inc.
* All Rights Reserved.
*
* Authors:
* Dave Airlie
* Alon Levy
*
* 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 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 HOLDER(S) OR AUTHOR(S) 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 <ttm/ttm_bo_api.h>
#include <ttm/ttm_bo_driver.h>
#include <ttm/ttm_placement.h>
#include <ttm/ttm_page_alloc.h>
#include <ttm/ttm_module.h>
#include <drm/drmP.h>
#include <drm/drm.h>
#include <drm/virtgpu_drm.h>
#include "virtgpu_drv.h"
#include <linux/delay.h>
#define DRM_FILE_PAGE_OFFSET (0x100000000ULL >> PAGE_SHIFT)
static struct
virtio_gpu_device *virtio_gpu_get_vgdev(struct ttm_bo_device *bdev)
{
struct virtio_gpu_mman *mman;
struct virtio_gpu_device *vgdev;
mman = container_of(bdev, struct virtio_gpu_mman, bdev);
vgdev = container_of(mman, struct virtio_gpu_device, mman);
return vgdev;
}
static int virtio_gpu_ttm_mem_global_init(struct drm_global_reference *ref)
{
return ttm_mem_global_init(ref->object);
}
static void virtio_gpu_ttm_mem_global_release(struct drm_global_reference *ref)
{
ttm_mem_global_release(ref->object);
}
static int virtio_gpu_ttm_global_init(struct virtio_gpu_device *vgdev)
{
struct drm_global_reference *global_ref;
int r;
vgdev->mman.mem_global_referenced = false;
global_ref = &vgdev->mman.mem_global_ref;
global_ref->global_type = DRM_GLOBAL_TTM_MEM;
global_ref->size = sizeof(struct ttm_mem_global);
global_ref->init = &virtio_gpu_ttm_mem_global_init;
global_ref->release = &virtio_gpu_ttm_mem_global_release;
r = drm_global_item_ref(global_ref);
if (r != 0) {
DRM_ERROR("Failed setting up TTM memory accounting "
"subsystem.\n");
return r;
}
vgdev->mman.bo_global_ref.mem_glob =
vgdev->mman.mem_global_ref.object;
global_ref = &vgdev->mman.bo_global_ref.ref;
global_ref->global_type = DRM_GLOBAL_TTM_BO;
global_ref->size = sizeof(struct ttm_bo_global);
global_ref->init = &ttm_bo_global_init;
global_ref->release = &ttm_bo_global_release;
r = drm_global_item_ref(global_ref);
if (r != 0) {
DRM_ERROR("Failed setting up TTM BO subsystem.\n");
drm_global_item_unref(&vgdev->mman.mem_global_ref);
return r;
}
vgdev->mman.mem_global_referenced = true;
return 0;
}
static void virtio_gpu_ttm_global_fini(struct virtio_gpu_device *vgdev)
{
if (vgdev->mman.mem_global_referenced) {
drm_global_item_unref(&vgdev->mman.bo_global_ref.ref);
drm_global_item_unref(&vgdev->mman.mem_global_ref);
vgdev->mman.mem_global_referenced = false;
}
}
#if 0
/*
* Hmm, seems to not do anything useful. Leftover debug hack?
* Something like printing pagefaults to kernel log?
*/
static struct vm_operations_struct virtio_gpu_ttm_vm_ops;
static const struct vm_operations_struct *ttm_vm_ops;
static int virtio_gpu_ttm_fault(struct vm_area_struct *vma,
struct vm_fault *vmf)
{
struct ttm_buffer_object *bo;
struct virtio_gpu_device *vgdev;
int r;
bo = (struct ttm_buffer_object *)vma->vm_private_data;
if (bo == NULL)
return VM_FAULT_NOPAGE;
vgdev = virtio_gpu_get_vgdev(bo->bdev);
r = ttm_vm_ops->fault(vma, vmf);
return r;
}
#endif
int virtio_gpu_mmap(struct file *filp, struct vm_area_struct *vma)
{
struct drm_file *file_priv;
struct virtio_gpu_device *vgdev;
int r;
file_priv = filp->private_data;
vgdev = file_priv->minor->dev->dev_private;
if (vgdev == NULL) {
DRM_ERROR(
"filp->private_data->minor->dev->dev_private == NULL\n");
return -EINVAL;
}
r = ttm_bo_mmap(filp, vma, &vgdev->mman.bdev);
#if 0
if (unlikely(r != 0))
return r;
if (unlikely(ttm_vm_ops == NULL)) {
ttm_vm_ops = vma->vm_ops;
virtio_gpu_ttm_vm_ops = *ttm_vm_ops;
virtio_gpu_ttm_vm_ops.fault = &virtio_gpu_ttm_fault;
}
vma->vm_ops = &virtio_gpu_ttm_vm_ops;
return 0;
#else
return r;
#endif
}
static int virtio_gpu_invalidate_caches(struct ttm_bo_device *bdev,
uint32_t flags)
{
return 0;
}
static int ttm_bo_man_get_node(struct ttm_mem_type_manager *man,
struct ttm_buffer_object *bo,
const struct ttm_place *place,
struct ttm_mem_reg *mem)
{
mem->mm_node = (void *)1;
return 0;
}
static void ttm_bo_man_put_node(struct ttm_mem_type_manager *man,
struct ttm_mem_reg *mem)
{
mem->mm_node = (void *)NULL;
return;
}
static int ttm_bo_man_init(struct ttm_mem_type_manager *man,
unsigned long p_size)
{
return 0;
}
static int ttm_bo_man_takedown(struct ttm_mem_type_manager *man)
{
return 0;
}
static void ttm_bo_man_debug(struct ttm_mem_type_manager *man,
const char *prefix)
{
}
static const struct ttm_mem_type_manager_func virtio_gpu_bo_manager_func = {
ttm_bo_man_init,
ttm_bo_man_takedown,
ttm_bo_man_get_node,
ttm_bo_man_put_node,
ttm_bo_man_debug
};
static int virtio_gpu_init_mem_type(struct ttm_bo_device *bdev, uint32_t type,
struct ttm_mem_type_manager *man)
{
struct virtio_gpu_device *vgdev;
vgdev = virtio_gpu_get_vgdev(bdev);
switch (type) {
case TTM_PL_SYSTEM:
/* System memory */
man->flags = TTM_MEMTYPE_FLAG_MAPPABLE;
man->available_caching = TTM_PL_MASK_CACHING;
man->default_caching = TTM_PL_FLAG_CACHED;
break;
case TTM_PL_TT:
man->func = &virtio_gpu_bo_manager_func;
man->flags = TTM_MEMTYPE_FLAG_MAPPABLE;
man->available_caching = TTM_PL_MASK_CACHING;
man->default_caching = TTM_PL_FLAG_CACHED;
break;
default:
DRM_ERROR("Unsupported memory type %u\n", (unsigned)type);
return -EINVAL;
}
return 0;
}
static void virtio_gpu_evict_flags(struct ttm_buffer_object *bo,
struct ttm_placement *placement)
{
static struct ttm_place placements = {
.fpfn = 0,
.lpfn = 0,
.flags = TTM_PL_MASK_CACHING | TTM_PL_FLAG_SYSTEM,
};
placement->placement = &placements;
placement->busy_placement = &placements;
placement->num_placement = 1;
placement->num_busy_placement = 1;
return;
}
static int virtio_gpu_verify_access(struct ttm_buffer_object *bo,
struct file *filp)
{
return 0;
}
static int virtio_gpu_ttm_io_mem_reserve(struct ttm_bo_device *bdev,
struct ttm_mem_reg *mem)
{
struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
mem->bus.addr = NULL;
mem->bus.offset = 0;
mem->bus.size = mem->num_pages << PAGE_SHIFT;
mem->bus.base = 0;
mem->bus.is_iomem = false;
if (!(man->flags & TTM_MEMTYPE_FLAG_MAPPABLE))
return -EINVAL;
switch (mem->mem_type) {
case TTM_PL_SYSTEM:
case TTM_PL_TT:
/* system memory */
return 0;
default:
return -EINVAL;
}
return 0;
}
static void virtio_gpu_ttm_io_mem_free(struct ttm_bo_device *bdev,
struct ttm_mem_reg *mem)
{
}
/*
* TTM backend functions.
*/
struct virtio_gpu_ttm_tt {
struct ttm_dma_tt ttm;
struct virtio_gpu_device *vgdev;
u64 offset;
};
static int virtio_gpu_ttm_backend_bind(struct ttm_tt *ttm,
struct ttm_mem_reg *bo_mem)
{
struct virtio_gpu_ttm_tt *gtt = (void *)ttm;
gtt->offset = (unsigned long)(bo_mem->start << PAGE_SHIFT);
if (!ttm->num_pages)
WARN(1, "nothing to bind %lu pages for mreg %p back %p!\n",
ttm->num_pages, bo_mem, ttm);
/* Not implemented */
return 0;
}
static int virtio_gpu_ttm_backend_unbind(struct ttm_tt *ttm)
{
/* Not implemented */
return 0;
}
static void virtio_gpu_ttm_backend_destroy(struct ttm_tt *ttm)
{
struct virtio_gpu_ttm_tt *gtt = (void *)ttm;
ttm_dma_tt_fini(>t->ttm);
kfree(gtt);
}
static struct ttm_backend_func virtio_gpu_backend_func = {
.bind = &virtio_gpu_ttm_backend_bind,
.unbind = &virtio_gpu_ttm_backend_unbind,
.destroy = &virtio_gpu_ttm_backend_destroy,
};
static int virtio_gpu_ttm_tt_populate(struct ttm_tt *ttm)
{
if (ttm->state != tt_unpopulated)
return 0;
return ttm_pool_populate(ttm);
}
static void virtio_gpu_ttm_tt_unpopulate(struct ttm_tt *ttm)
{
ttm_pool_unpopulate(ttm);
}
static struct ttm_tt *virtio_gpu_ttm_tt_create(struct ttm_bo_device *bdev,
unsigned long size,
uint32_t page_flags,
struct page *dummy_read_page)
{
struct virtio_gpu_device *vgdev;
struct virtio_gpu_ttm_tt *gtt;
vgdev = virtio_gpu_get_vgdev(bdev);
gtt = kzalloc(sizeof(struct virtio_gpu_ttm_tt), GFP_KERNEL);
if (gtt == NULL)
return NULL;
gtt->ttm.ttm.func = &virtio_gpu_backend_func;
gtt->vgdev = vgdev;
if (ttm_dma_tt_init(>t->ttm, bdev, size, page_flags,
dummy_read_page)) {
kfree(gtt);
return NULL;
}
return >t->ttm.ttm;
}
static void virtio_gpu_move_null(struct ttm_buffer_object *bo,
struct ttm_mem_reg *new_mem)
{
struct ttm_mem_reg *old_mem = &bo->mem;
BUG_ON(old_mem->mm_node != NULL);
*old_mem = *new_mem;
new_mem->mm_node = NULL;
}
static int virtio_gpu_bo_move(struct ttm_buffer_object *bo,
bool evict, bool interruptible,
bool no_wait_gpu,
struct ttm_mem_reg *new_mem)
{
virtio_gpu_move_null(bo, new_mem);
return 0;
}
static void virtio_gpu_bo_move_notify(struct ttm_buffer_object *tbo,
struct ttm_mem_reg *new_mem)
{
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 (!new_mem || (new_mem->placement & TTM_PL_FLAG_SYSTEM)) {
if (bo->hw_res_handle)
virtio_gpu_cmd_resource_inval_backing(vgdev,
bo->hw_res_handle);
} else if (new_mem->placement & TTM_PL_FLAG_TT) {
if (bo->hw_res_handle) {
virtio_gpu_object_attach(vgdev, bo, bo->hw_res_handle,
NULL);
}
}
}
static void virtio_gpu_bo_swap_notify(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->pages)
virtio_gpu_object_free_sg_table(bo);
}
static struct ttm_bo_driver virtio_gpu_bo_driver = {
.ttm_tt_create = &virtio_gpu_ttm_tt_create,
.ttm_tt_populate = &virtio_gpu_ttm_tt_populate,
.ttm_tt_unpopulate = &virtio_gpu_ttm_tt_unpopulate,
.invalidate_caches = &virtio_gpu_invalidate_caches,
.init_mem_type = &virtio_gpu_init_mem_type,
.evict_flags = &virtio_gpu_evict_flags,
.move = &virtio_gpu_bo_move,
.verify_access = &virtio_gpu_verify_access,
.io_mem_reserve = &virtio_gpu_ttm_io_mem_reserve,
.io_mem_free = &virtio_gpu_ttm_io_mem_free,
.move_notify = &virtio_gpu_bo_move_notify,
.swap_notify = &virtio_gpu_bo_swap_notify,
};
int virtio_gpu_ttm_init(struct virtio_gpu_device *vgdev)
{
int r;
r = virtio_gpu_ttm_global_init(vgdev);
if (r)
return r;
/* No others user of address space so set it to 0 */
r = ttm_bo_device_init(&vgdev->mman.bdev,
vgdev->mman.bo_global_ref.ref.object,
&virtio_gpu_bo_driver,
vgdev->ddev->anon_inode->i_mapping,
DRM_FILE_PAGE_OFFSET, 0);
if (r) {
DRM_ERROR("failed initializing buffer object driver(%d).\n", r);
goto err_dev_init;
}
r = ttm_bo_init_mm(&vgdev->mman.bdev, TTM_PL_TT, 0);
if (r) {
DRM_ERROR("Failed initializing GTT heap.\n");
goto err_mm_init;
}
return 0;
err_mm_init:
ttm_bo_device_release(&vgdev->mman.bdev);
err_dev_init:
virtio_gpu_ttm_global_fini(vgdev);
return r;
}
void virtio_gpu_ttm_fini(struct virtio_gpu_device *vgdev)
{
ttm_bo_device_release(&vgdev->mman.bdev);
virtio_gpu_ttm_global_fini(vgdev);
DRM_INFO("virtio_gpu: ttm finalized\n");
}