blob: 807c80f1f02464d1baa466d82977ffb20716cc8a [file] [log] [blame]
// SPDX-License-Identifier: GPL-2.0-or-later
/*
*/
#include "bochs.h"
static void bochs_ttm_placement(struct bochs_bo *bo, int domain);
/* ---------------------------------------------------------------------- */
static inline struct bochs_device *bochs_bdev(struct ttm_bo_device *bd)
{
return container_of(bd, struct bochs_device, ttm.bdev);
}
static void bochs_bo_ttm_destroy(struct ttm_buffer_object *tbo)
{
struct bochs_bo *bo;
bo = container_of(tbo, struct bochs_bo, bo);
drm_gem_object_release(&bo->gem);
kfree(bo);
}
static bool bochs_ttm_bo_is_bochs_bo(struct ttm_buffer_object *bo)
{
if (bo->destroy == &bochs_bo_ttm_destroy)
return true;
return false;
}
static int bochs_bo_init_mem_type(struct ttm_bo_device *bdev, uint32_t 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)type);
return -EINVAL;
}
return 0;
}
static void
bochs_bo_evict_flags(struct ttm_buffer_object *bo, struct ttm_placement *pl)
{
struct bochs_bo *bochsbo = bochs_bo(bo);
if (!bochs_ttm_bo_is_bochs_bo(bo))
return;
bochs_ttm_placement(bochsbo, TTM_PL_FLAG_SYSTEM);
*pl = bochsbo->placement;
}
static int bochs_bo_verify_access(struct ttm_buffer_object *bo,
struct file *filp)
{
struct bochs_bo *bochsbo = bochs_bo(bo);
return drm_vma_node_verify_access(&bochsbo->gem.vma_node,
filp->private_data);
}
static int bochs_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 bochs_device *bochs = bochs_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 = bochs->fb_base;
mem->bus.is_iomem = true;
break;
default:
return -EINVAL;
break;
}
return 0;
}
static void bochs_ttm_io_mem_free(struct ttm_bo_device *bdev,
struct ttm_mem_reg *mem)
{
}
static void bochs_ttm_backend_destroy(struct ttm_tt *tt)
{
ttm_tt_fini(tt);
kfree(tt);
}
static struct ttm_backend_func bochs_tt_backend_func = {
.destroy = &bochs_ttm_backend_destroy,
};
static struct ttm_tt *bochs_ttm_tt_create(struct ttm_buffer_object *bo,
uint32_t page_flags)
{
struct ttm_tt *tt;
tt = kzalloc(sizeof(struct ttm_tt), GFP_KERNEL);
if (tt == NULL)
return NULL;
tt->func = &bochs_tt_backend_func;
if (ttm_tt_init(tt, bo, page_flags)) {
kfree(tt);
return NULL;
}
return tt;
}
static struct ttm_bo_driver bochs_bo_driver = {
.ttm_tt_create = bochs_ttm_tt_create,
.init_mem_type = bochs_bo_init_mem_type,
.eviction_valuable = ttm_bo_eviction_valuable,
.evict_flags = bochs_bo_evict_flags,
.move = NULL,
.verify_access = bochs_bo_verify_access,
.io_mem_reserve = &bochs_ttm_io_mem_reserve,
.io_mem_free = &bochs_ttm_io_mem_free,
};
int bochs_mm_init(struct bochs_device *bochs)
{
struct ttm_bo_device *bdev = &bochs->ttm.bdev;
int ret;
ret = ttm_bo_device_init(&bochs->ttm.bdev,
&bochs_bo_driver,
bochs->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,
bochs->fb_size >> PAGE_SHIFT);
if (ret) {
DRM_ERROR("Failed ttm VRAM init: %d\n", ret);
return ret;
}
bochs->ttm.initialized = true;
return 0;
}
void bochs_mm_fini(struct bochs_device *bochs)
{
if (!bochs->ttm.initialized)
return;
ttm_bo_device_release(&bochs->ttm.bdev);
bochs->ttm.initialized = false;
}
static void bochs_ttm_placement(struct bochs_bo *bo, int domain)
{
unsigned 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;
}
for (i = 0; i < c; ++i) {
bo->placements[i].fpfn = 0;
bo->placements[i].lpfn = 0;
}
bo->placement.num_placement = c;
bo->placement.num_busy_placement = c;
}
int bochs_bo_pin(struct bochs_bo *bo, u32 pl_flag)
{
struct ttm_operation_ctx ctx = { false, false };
int i, ret;
if (bo->pin_count) {
bo->pin_count++;
return 0;
}
bochs_ttm_placement(bo, pl_flag);
for (i = 0; i < bo->placement.num_placement; i++)
bo->placements[i].flags |= TTM_PL_FLAG_NO_EVICT;
ret = ttm_bo_reserve(&bo->bo, true, false, NULL);
if (ret)
return ret;
ret = ttm_bo_validate(&bo->bo, &bo->placement, &ctx);
ttm_bo_unreserve(&bo->bo);
if (ret)
return ret;
bo->pin_count = 1;
return 0;
}
int bochs_bo_unpin(struct bochs_bo *bo)
{
struct ttm_operation_ctx ctx = { false, false };
int i, ret;
if (!bo->pin_count) {
DRM_ERROR("unpin bad %p\n", bo);
return 0;
}
bo->pin_count--;
if (bo->pin_count)
return 0;
for (i = 0; i < bo->placement.num_placement; i++)
bo->placements[i].flags &= ~TTM_PL_FLAG_NO_EVICT;
ret = ttm_bo_reserve(&bo->bo, true, false, NULL);
if (ret)
return ret;
ret = ttm_bo_validate(&bo->bo, &bo->placement, &ctx);
ttm_bo_unreserve(&bo->bo);
if (ret)
return ret;
return 0;
}
int bochs_mmap(struct file *filp, struct vm_area_struct *vma)
{
struct drm_file *file_priv = filp->private_data;
struct bochs_device *bochs = file_priv->minor->dev->dev_private;
return ttm_bo_mmap(filp, vma, &bochs->ttm.bdev);
}
/* ---------------------------------------------------------------------- */
static int bochs_bo_create(struct drm_device *dev, int size, int align,
uint32_t flags, struct bochs_bo **pbochsbo)
{
struct bochs_device *bochs = dev->dev_private;
struct bochs_bo *bochsbo;
size_t acc_size;
int ret;
bochsbo = kzalloc(sizeof(struct bochs_bo), GFP_KERNEL);
if (!bochsbo)
return -ENOMEM;
ret = drm_gem_object_init(dev, &bochsbo->gem, size);
if (ret) {
kfree(bochsbo);
return ret;
}
bochsbo->bo.bdev = &bochs->ttm.bdev;
bochsbo->bo.bdev->dev_mapping = dev->anon_inode->i_mapping;
bochs_ttm_placement(bochsbo, TTM_PL_FLAG_VRAM | TTM_PL_FLAG_SYSTEM);
acc_size = ttm_bo_dma_acc_size(&bochs->ttm.bdev, size,
sizeof(struct bochs_bo));
ret = ttm_bo_init(&bochs->ttm.bdev, &bochsbo->bo, size,
ttm_bo_type_device, &bochsbo->placement,
align >> PAGE_SHIFT, false, acc_size,
NULL, NULL, bochs_bo_ttm_destroy);
if (ret)
return ret;
*pbochsbo = bochsbo;
return 0;
}
int bochs_gem_create(struct drm_device *dev, u32 size, bool iskernel,
struct drm_gem_object **obj)
{
struct bochs_bo *bochsbo;
int ret;
*obj = NULL;
size = PAGE_ALIGN(size);
if (size == 0)
return -EINVAL;
ret = bochs_bo_create(dev, size, 0, 0, &bochsbo);
if (ret) {
if (ret != -ERESTARTSYS)
DRM_ERROR("failed to allocate GEM object\n");
return ret;
}
*obj = &bochsbo->gem;
return 0;
}
int bochs_dumb_create(struct drm_file *file, struct drm_device *dev,
struct drm_mode_create_dumb *args)
{
struct drm_gem_object *gobj;
u32 handle;
int ret;
args->pitch = args->width * ((args->bpp + 7) / 8);
args->size = args->pitch * args->height;
ret = bochs_gem_create(dev, args->size, false,
&gobj);
if (ret)
return ret;
ret = drm_gem_handle_create(file, gobj, &handle);
drm_gem_object_put_unlocked(gobj);
if (ret)
return ret;
args->handle = handle;
return 0;
}
static void bochs_bo_unref(struct bochs_bo **bo)
{
struct ttm_buffer_object *tbo;
if ((*bo) == NULL)
return;
tbo = &((*bo)->bo);
ttm_bo_put(tbo);
*bo = NULL;
}
void bochs_gem_free_object(struct drm_gem_object *obj)
{
struct bochs_bo *bochs_bo = gem_to_bochs_bo(obj);
bochs_bo_unref(&bochs_bo);
}
int bochs_dumb_mmap_offset(struct drm_file *file, struct drm_device *dev,
uint32_t handle, uint64_t *offset)
{
struct drm_gem_object *obj;
struct bochs_bo *bo;
obj = drm_gem_object_lookup(file, handle);
if (obj == NULL)
return -ENOENT;
bo = gem_to_bochs_bo(obj);
*offset = bochs_bo_mmap_offset(bo);
drm_gem_object_put_unlocked(obj);
return 0;
}
/* ---------------------------------------------------------------------- */
int bochs_gem_prime_pin(struct drm_gem_object *obj)
{
struct bochs_bo *bo = gem_to_bochs_bo(obj);
return bochs_bo_pin(bo, TTM_PL_FLAG_VRAM);
}
void bochs_gem_prime_unpin(struct drm_gem_object *obj)
{
struct bochs_bo *bo = gem_to_bochs_bo(obj);
bochs_bo_unpin(bo);
}
void *bochs_gem_prime_vmap(struct drm_gem_object *obj)
{
struct bochs_bo *bo = gem_to_bochs_bo(obj);
bool is_iomem;
int ret;
ret = bochs_bo_pin(bo, TTM_PL_FLAG_VRAM);
if (ret)
return NULL;
ret = ttm_bo_kmap(&bo->bo, 0, bo->bo.num_pages, &bo->kmap);
if (ret) {
bochs_bo_unpin(bo);
return NULL;
}
return ttm_kmap_obj_virtual(&bo->kmap, &is_iomem);
}
void bochs_gem_prime_vunmap(struct drm_gem_object *obj, void *vaddr)
{
struct bochs_bo *bo = gem_to_bochs_bo(obj);
ttm_bo_kunmap(&bo->kmap);
bochs_bo_unpin(bo);
}
int bochs_gem_prime_mmap(struct drm_gem_object *obj,
struct vm_area_struct *vma)
{
struct bochs_bo *bo = gem_to_bochs_bo(obj);
bo->gem.vma_node.vm_node.start = bo->bo.vma_node.vm_node.start;
return drm_gem_prime_mmap(obj, vma);
}