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// SPDX-License-Identifier: MIT
/*
* Copyright (C) 2013-2017 Oracle Corporation
* This file is based on ast_ttm.c
* Copyright 2012 Red Hat Inc.
* Authors: Dave Airlie <airlied@redhat.com>
* Michael Thayer <michael.thayer@oracle.com>
*/
#include <linux/pci.h>
#include <drm/drm_file.h>
#include <drm/ttm/ttm_page_alloc.h>
#include "vbox_drv.h"
static inline struct vbox_private *vbox_bdev(struct ttm_bo_device *bd)
{
return container_of(bd, struct vbox_private, ttm.bdev);
}
static void vbox_bo_ttm_destroy(struct ttm_buffer_object *tbo)
{
struct vbox_bo *bo;
bo = container_of(tbo, struct vbox_bo, bo);
drm_gem_object_release(&bo->gem);
kfree(bo);
}
static bool vbox_ttm_bo_is_vbox_bo(struct ttm_buffer_object *bo)
{
if (bo->destroy == &vbox_bo_ttm_destroy)
return true;
return false;
}
static int
vbox_bo_init_mem_type(struct ttm_bo_device *bdev, u32 type,
struct ttm_mem_type_manager *man)
{
switch (type) {
case TTM_PL_SYSTEM:
man->flags = TTM_MEMTYPE_FLAG_MAPPABLE;
man->available_caching = TTM_PL_MASK_CACHING;
man->default_caching = TTM_PL_FLAG_CACHED;
break;
case TTM_PL_VRAM:
man->func = &ttm_bo_manager_func;
man->flags = TTM_MEMTYPE_FLAG_FIXED | TTM_MEMTYPE_FLAG_MAPPABLE;
man->available_caching = TTM_PL_FLAG_UNCACHED | TTM_PL_FLAG_WC;
man->default_caching = TTM_PL_FLAG_WC;
break;
default:
DRM_ERROR("Unsupported memory type %u\n", (unsigned int)type);
return -EINVAL;
}
return 0;
}
static void
vbox_bo_evict_flags(struct ttm_buffer_object *bo, struct ttm_placement *pl)
{
struct vbox_bo *vboxbo = vbox_bo(bo);
if (!vbox_ttm_bo_is_vbox_bo(bo))
return;
vbox_ttm_placement(vboxbo, TTM_PL_FLAG_SYSTEM);
*pl = vboxbo->placement;
}
static int vbox_bo_verify_access(struct ttm_buffer_object *bo,
struct file *filp)
{
return 0;
}
static int vbox_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];
struct vbox_private *vbox = vbox_bdev(bdev);
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:
/* system memory */
return 0;
case TTM_PL_VRAM:
mem->bus.offset = mem->start << PAGE_SHIFT;
mem->bus.base = pci_resource_start(vbox->ddev.pdev, 0);
mem->bus.is_iomem = true;
break;
default:
return -EINVAL;
}
return 0;
}
static void vbox_ttm_io_mem_free(struct ttm_bo_device *bdev,
struct ttm_mem_reg *mem)
{
}
static void vbox_ttm_backend_destroy(struct ttm_tt *tt)
{
ttm_tt_fini(tt);
kfree(tt);
}
static struct ttm_backend_func vbox_tt_backend_func = {
.destroy = &vbox_ttm_backend_destroy,
};
static struct ttm_tt *vbox_ttm_tt_create(struct ttm_buffer_object *bo,
u32 page_flags)
{
struct ttm_tt *tt;
tt = kzalloc(sizeof(*tt), GFP_KERNEL);
if (!tt)
return NULL;
tt->func = &vbox_tt_backend_func;
if (ttm_tt_init(tt, bo, page_flags)) {
kfree(tt);
return NULL;
}
return tt;
}
static struct ttm_bo_driver vbox_bo_driver = {
.ttm_tt_create = vbox_ttm_tt_create,
.init_mem_type = vbox_bo_init_mem_type,
.eviction_valuable = ttm_bo_eviction_valuable,
.evict_flags = vbox_bo_evict_flags,
.verify_access = vbox_bo_verify_access,
.io_mem_reserve = &vbox_ttm_io_mem_reserve,
.io_mem_free = &vbox_ttm_io_mem_free,
};
int vbox_mm_init(struct vbox_private *vbox)
{
int ret;
struct drm_device *dev = &vbox->ddev;
struct ttm_bo_device *bdev = &vbox->ttm.bdev;
ret = ttm_bo_device_init(&vbox->ttm.bdev,
&vbox_bo_driver,
dev->anon_inode->i_mapping,
DRM_FILE_PAGE_OFFSET, true);
if (ret) {
DRM_ERROR("Error initialising bo driver; %d\n", ret);
return ret;
}
ret = ttm_bo_init_mm(bdev, TTM_PL_VRAM,
vbox->available_vram_size >> PAGE_SHIFT);
if (ret) {
DRM_ERROR("Failed ttm VRAM init: %d\n", ret);
goto err_device_release;
}
#ifdef DRM_MTRR_WC
vbox->fb_mtrr = drm_mtrr_add(pci_resource_start(dev->pdev, 0),
pci_resource_len(dev->pdev, 0),
DRM_MTRR_WC);
#else
vbox->fb_mtrr = arch_phys_wc_add(pci_resource_start(dev->pdev, 0),
pci_resource_len(dev->pdev, 0));
#endif
return 0;
err_device_release:
ttm_bo_device_release(&vbox->ttm.bdev);
return ret;
}
void vbox_mm_fini(struct vbox_private *vbox)
{
#ifdef DRM_MTRR_WC
drm_mtrr_del(vbox->fb_mtrr,
pci_resource_start(vbox->ddev.pdev, 0),
pci_resource_len(vbox->ddev.pdev, 0), DRM_MTRR_WC);
#else
arch_phys_wc_del(vbox->fb_mtrr);
#endif
ttm_bo_device_release(&vbox->ttm.bdev);
}
void vbox_ttm_placement(struct vbox_bo *bo, int domain)
{
unsigned int i;
u32 c = 0;
bo->placement.placement = bo->placements;
bo->placement.busy_placement = bo->placements;
if (domain & TTM_PL_FLAG_VRAM)
bo->placements[c++].flags =
TTM_PL_FLAG_WC | TTM_PL_FLAG_UNCACHED | TTM_PL_FLAG_VRAM;
if (domain & TTM_PL_FLAG_SYSTEM)
bo->placements[c++].flags =
TTM_PL_MASK_CACHING | TTM_PL_FLAG_SYSTEM;
if (!c)
bo->placements[c++].flags =
TTM_PL_MASK_CACHING | TTM_PL_FLAG_SYSTEM;
bo->placement.num_placement = c;
bo->placement.num_busy_placement = c;
for (i = 0; i < c; ++i) {
bo->placements[i].fpfn = 0;
bo->placements[i].lpfn = 0;
}
}
int vbox_bo_create(struct vbox_private *vbox, int size, int align,
u32 flags, struct vbox_bo **pvboxbo)
{
struct vbox_bo *vboxbo;
size_t acc_size;
int ret;
vboxbo = kzalloc(sizeof(*vboxbo), GFP_KERNEL);
if (!vboxbo)
return -ENOMEM;
ret = drm_gem_object_init(&vbox->ddev, &vboxbo->gem, size);
if (ret)
goto err_free_vboxbo;
vboxbo->bo.bdev = &vbox->ttm.bdev;
vbox_ttm_placement(vboxbo, TTM_PL_FLAG_VRAM | TTM_PL_FLAG_SYSTEM);
acc_size = ttm_bo_dma_acc_size(&vbox->ttm.bdev, size,
sizeof(struct vbox_bo));
ret = ttm_bo_init(&vbox->ttm.bdev, &vboxbo->bo, size,
ttm_bo_type_device, &vboxbo->placement,
align >> PAGE_SHIFT, false, acc_size,
NULL, NULL,
|