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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 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 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 = drm_gem_vram_bo_driver_evict_flags,
.verify_access = drm_gem_vram_bo_driver_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,
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);
}
int vbox_mmap(struct file *filp, struct vm_area_struct *vma)
{
struct drm_file *file_priv = filp->private_data;
struct vbox_private *vbox = file_priv->minor->dev->dev_private;
return ttm_bo_mmap(filp, vma, &vbox->ttm.bdev);
}
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