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drm/linux-core/drm_ttm.c

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/**************************************************************************
*
* Copyright 2006 Tungsten Graphics, Inc., Bismarck, ND., USA
* 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, sub license, 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 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 NON-INFRINGEMENT. IN NO EVENT SHALL
* THE COPYRIGHT HOLDERS, AUTHORS 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.
*
* The above copyright notice and this permission notice (including the
* next paragraph) shall be included in all copies or substantial portions
* of the Software.
*
*
**************************************************************************/
#include "drmP.h"
#include <asm/tlbflush.h>
typedef struct p_mm_entry {
struct list_head head;
struct mm_struct *mm;
atomic_t refcount;
} p_mm_entry_t;
typedef struct drm_val_action {
int needs_rx_flush;
int evicted_tt;
int evicted_vram;
int validated;
} drm_val_action_t;
/*
* Use kmalloc if possible. Otherwise fall back to vmalloc.
*/
static void *ttm_alloc(unsigned long size, int type, int *do_vmalloc)
{
void *ret = NULL;
*do_vmalloc = 0;
if (size <= 4*PAGE_SIZE) {
ret = drm_alloc(size, type);
}
if (!ret) {
*do_vmalloc = 1;
ret = vmalloc(size);
}
return ret;
}
static void ttm_free(void *pointer, unsigned long size, int type,
int do_vfree)
{
if (!do_vfree) {
drm_free(pointer, size, type);
}else {
vfree(pointer);
}
}
/*
* We may be manipulating other processes page tables, so for each TTM, keep track of
* which mm_structs are currently mapping the ttm so that we can take the appropriate
* locks when we modify their page tables. A typical application is when we evict another
* process' buffers.
*/
int drm_ttm_add_mm_to_list(drm_ttm_t * ttm, struct mm_struct *mm)
{
p_mm_entry_t *entry, *n_entry;
list_for_each_entry(entry, &ttm->p_mm_list, head) {
if (mm == entry->mm) {
atomic_inc(&entry->refcount);
return 0;
} else if ((unsigned long)mm < (unsigned long)entry->mm) ;
}
n_entry = drm_alloc(sizeof(*n_entry), DRM_MEM_TTM);
if (!entry) {
DRM_ERROR("Allocation of process mm pointer entry failed\n");
return -ENOMEM;
}
INIT_LIST_HEAD(&n_entry->head);
n_entry->mm = mm;
atomic_set(&n_entry->refcount, 0);
atomic_inc(&ttm->shared_count);
ttm->mm_list_seq++;
list_add_tail(&n_entry->head, &entry->head);
return 0;
}
void drm_ttm_delete_mm(drm_ttm_t * ttm, struct mm_struct *mm)
{
p_mm_entry_t *entry, *n;
list_for_each_entry_safe(entry, n, &ttm->p_mm_list, head) {
if (mm == entry->mm) {
if (atomic_add_negative(-1, &entry->refcount)) {
list_del(&entry->head);
drm_free(entry, sizeof(*entry), DRM_MEM_TTM);
atomic_dec(&ttm->shared_count);
ttm->mm_list_seq++;
}
return;
}
}
BUG_ON(1);
}
static void drm_ttm_lock_mm(drm_ttm_t * ttm, int mm_sem, int page_table)
{
p_mm_entry_t *entry;
list_for_each_entry(entry, &ttm->p_mm_list, head) {
if (mm_sem) {
down_write(&entry->mm->mmap_sem);
}
if (page_table) {
spin_lock(&entry->mm->page_table_lock);
}
}
}
static void drm_ttm_unlock_mm(drm_ttm_t * ttm, int mm_sem, int page_table)
{
p_mm_entry_t *entry;
list_for_each_entry(entry, &ttm->p_mm_list, head) {
if (page_table) {
spin_unlock(&entry->mm->page_table_lock);
}
if (mm_sem) {
up_write(&entry->mm->mmap_sem);
}
}
}
static int ioremap_vmas(drm_ttm_t * ttm, unsigned long page_offset,
unsigned long num_pages, unsigned long aper_offset)
{
struct list_head *list;
int ret = 0;
list_for_each(list, &ttm->vma_list->head) {
drm_ttm_vma_list_t *entry =
list_entry(list, drm_ttm_vma_list_t, head);
ret = io_remap_pfn_range(entry->vma,
entry->vma->vm_start +
(page_offset << PAGE_SHIFT),
(ttm->aperture_base >> PAGE_SHIFT) +
aper_offset, num_pages << PAGE_SHIFT,
drm_io_prot(_DRM_AGP, entry->vma));
if (ret)
break;
}
global_flush_tlb();
return ret;
}
/*
* Unmap all vma pages from vmas mapping this ttm.
*/
static int unmap_vma_pages(drm_ttm_t * ttm, unsigned long page_offset,
unsigned long num_pages)
{
struct list_head *list;
struct page **first_page = ttm->pages + page_offset;
struct page **last_page = ttm->pages + (page_offset + num_pages);
struct page **cur_page;
#if !defined(flush_tlb_mm) && defined(MODULE)
int flush_tlb = 0;
#endif
list_for_each(list, &ttm->vma_list->head) {
drm_ttm_vma_list_t *entry =
list_entry(list, drm_ttm_vma_list_t, head);
drm_clear_vma(entry->vma,
entry->vma->vm_start +
(page_offset << PAGE_SHIFT),
entry->vma->vm_start +
((page_offset + num_pages) << PAGE_SHIFT));
#if !defined(flush_tlb_mm) && defined(MODULE)
flush_tlb = 1;
#endif
}
#if !defined(flush_tlb_mm) && defined(MODULE)
if (flush_tlb)
global_flush_tlb();
#endif
for (cur_page = first_page; cur_page != last_page; ++cur_page) {
if (page_mapcount(*cur_page) != 0) {
DRM_ERROR("Mapped page detected. Map count is %d\n",
page_mapcount(*cur_page));
return -1;
}
}
return 0;
}
/*
* Free all resources associated with a ttm.
*/
int drm_destroy_ttm(drm_ttm_t * ttm)
{
int i;
struct list_head *list, *next;
struct page **cur_page;
if (!ttm)
return 0;
if (atomic_read(&ttm->vma_count) > 0) {
ttm->destroy = 1;
DRM_ERROR("VMAs are still alive. Skipping destruction.\n");
return -EBUSY;
}
DRM_DEBUG("Destroying a ttm\n");
if (ttm->be_list) {
list_for_each_safe(list, next, &ttm->be_list->head) {
drm_ttm_backend_list_t *entry =
list_entry(list, drm_ttm_backend_list_t, head);
drm_destroy_ttm_region(entry);
}
drm_free(ttm->be_list, sizeof(*ttm->be_list), DRM_MEM_TTM);
ttm->be_list = NULL;
}
if (ttm->pages) {
for (i = 0; i < ttm->num_pages; ++i) {
cur_page = ttm->pages + i;
if (ttm->page_flags &&
(ttm->page_flags[i] & DRM_TTM_PAGE_UNCACHED) &&
*cur_page && !PageHighMem(*cur_page)) {
change_page_attr(*cur_page, 1, PAGE_KERNEL);
}
if (*cur_page) {
ClearPageReserved(*cur_page);
__free_page(*cur_page);
}
}
global_flush_tlb();
ttm_free(ttm->pages, ttm->num_pages*sizeof(*ttm->pages),
DRM_MEM_TTM, ttm->pages_vmalloc);
ttm->pages = NULL;
}
if (ttm->page_flags) {
ttm_free(ttm->page_flags, ttm->num_pages*sizeof(*ttm->page_flags), DRM_MEM_TTM, ttm->pf_vmalloc);
ttm->page_flags = NULL;
}
if (ttm->vma_list) {
list_for_each_safe(list, next, &ttm->vma_list->head) {
drm_ttm_vma_list_t *entry =
list_entry(list, drm_ttm_vma_list_t, head);
list_del(list);
entry->vma->vm_private_data = NULL;
drm_free(entry, sizeof(*entry), DRM_MEM_TTM);
}
drm_free(ttm->vma_list, sizeof(*ttm->vma_list), DRM_MEM_TTM);
ttm->vma_list = NULL;
}
drm_free(ttm, sizeof(*ttm), DRM_MEM_TTM);
return 0;
}
/*
* Initialize a ttm.
* FIXME: Avoid using vmalloc for the page- and page_flags tables?
*/
static drm_ttm_t *drm_init_ttm(struct drm_device *dev, unsigned long size)
{
drm_ttm_t *ttm;
if (!dev->driver->bo_driver)
return NULL;
ttm = drm_calloc(1, sizeof(*ttm), DRM_MEM_TTM);
if (!ttm)
return NULL;
ttm->lhandle = 0;
atomic_set(&ttm->vma_count, 0);
ttm->destroy = 0;
ttm->num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
ttm->page_flags = ttm_alloc(ttm->num_pages * sizeof(*ttm->page_flags),
DRM_MEM_TTM, &ttm->pf_vmalloc);
if (!ttm->page_flags) {
drm_destroy_ttm(ttm);
DRM_ERROR("Failed allocating page_flags table\n");
return NULL;
}
memset(ttm->page_flags, 0, ttm->num_pages * sizeof(*ttm->page_flags));
ttm->pages = ttm_alloc(ttm->num_pages * sizeof(*ttm->pages),
DRM_MEM_TTM, &ttm->pages_vmalloc);
if (!ttm->pages) {
drm_destroy_ttm(ttm);
DRM_ERROR("Failed allocating page table\n");
return NULL;
}
memset(ttm->pages, 0, ttm->num_pages * sizeof(*ttm->pages));
ttm->be_list = drm_calloc(1, sizeof(*ttm->be_list), DRM_MEM_TTM);
if (!ttm->be_list) {
DRM_ERROR("Alloc be regions failed\n");
drm_destroy_ttm(ttm);
return NULL;
}
INIT_LIST_HEAD(&ttm->be_list->head);
INIT_LIST_HEAD(&ttm->p_mm_list);
atomic_set(&ttm->shared_count, 0);
ttm->mm_list_seq = 0;
ttm->vma_list = drm_calloc(1, sizeof(*ttm->vma_list), DRM_MEM_TTM);
if (!ttm->vma_list) {
DRM_ERROR("Alloc vma list failed\n");
drm_destroy_ttm(ttm);
return NULL;
}
INIT_LIST_HEAD(&ttm->vma_list->head);
ttm->lhandle = (unsigned long)ttm;
ttm->dev = dev;
return ttm;
}
/*
* Lock the mmap_sems for processes that are mapping this ttm.
* This looks a bit clumsy, since we need to maintain the correct
* locking order
* mm->mmap_sem
* dev->struct_sem;
* and while we release dev->struct_sem to lock the mmap_sems,
* the mmap_sem list may have been updated. We need to revalidate
* it after relocking dev->struc_sem.
*/
static int drm_ttm_lock_mmap_sem(drm_ttm_t * ttm)
{
struct mm_struct **mm_list = NULL, **mm_list_p;
uint32_t list_seq;
uint32_t cur_count, shared_count;
p_mm_entry_t *entry;
unsigned i;
cur_count = 0;
list_seq = ttm->mm_list_seq;
shared_count = atomic_read(&ttm->shared_count);
do {
if (shared_count > cur_count) {
if (mm_list)
drm_free(mm_list, sizeof(*mm_list) * cur_count,
DRM_MEM_TTM);
cur_count = shared_count + 10;
mm_list =
drm_alloc(sizeof(*mm_list) * cur_count,
DRM_MEM_TTM);
if (!mm_list)
return -ENOMEM;
}
mm_list_p = mm_list;
list_for_each_entry(entry, &ttm->p_mm_list, head) {
*mm_list_p++ = entry->mm;
}
mutex_unlock(&ttm->dev->struct_mutex);
mm_list_p = mm_list;
for (i = 0; i < shared_count; ++i, ++mm_list_p) {
down_write(&((*mm_list_p)->mmap_sem));
}
mutex_lock(&ttm->dev->struct_mutex);
if (list_seq != ttm->mm_list_seq) {
mm_list_p = mm_list;
for (i = 0; i < shared_count; ++i, ++mm_list_p) {
up_write(&((*mm_list_p)->mmap_sem));
}
}
shared_count = atomic_read(&ttm->shared_count);
} while (list_seq != ttm->mm_list_seq);
if (mm_list)
drm_free(mm_list, sizeof(*mm_list) * cur_count, DRM_MEM_TTM);
return 0;
}
/*
* Change caching policy for range of pages in a ttm.
*/
static int drm_set_caching(drm_ttm_t * ttm, unsigned long page_offset,
unsigned long num_pages, int noncached,
int do_tlbflush)
{
int i, cur;
struct page **cur_page;
pgprot_t attr = (noncached) ? PAGE_KERNEL_NOCACHE : PAGE_KERNEL;
for (i = 0; i < num_pages; ++i) {
cur = page_offset + i;
cur_page = ttm->pages + cur;
if (*cur_page) {
if (PageHighMem(*cur_page)) {
if (noncached
&& page_address(*cur_page) != NULL) {
DRM_ERROR
("Illegal mapped HighMem Page\n");
return -EINVAL;
}
} else if ((ttm->page_flags[cur] &
DRM_TTM_PAGE_UNCACHED) != noncached) {
DRM_MASK_VAL(ttm->page_flags[cur],
DRM_TTM_PAGE_UNCACHED, noncached);
change_page_attr(*cur_page, 1, attr);
}
}
}
if (do_tlbflush)
global_flush_tlb();
return 0;
}
/*
* Unbind a ttm region from the aperture.
*/
int drm_evict_ttm_region(drm_ttm_backend_list_t * entry)
{
drm_ttm_backend_t *be = entry->be;
drm_ttm_t *ttm = entry->owner;
int ret;
if (be) {
switch (entry->state) {
case ttm_bound:
if (ttm && be->needs_cache_adjust(be)) {
ret = drm_ttm_lock_mmap_sem(ttm);
if (ret)
return ret;
drm_ttm_lock_mm(ttm, 0, 1);
unmap_vma_pages(ttm, entry->page_offset,
entry->num_pages);
drm_ttm_unlock_mm(ttm, 0, 1);
}
#ifdef BODEBUG
DRM_ERROR("Unbinding\n");
#endif
be->unbind(entry->be);
if (ttm && be->needs_cache_adjust(be)) {
drm_set_caching(ttm, entry->page_offset,
entry->num_pages, 0, 1);
drm_ttm_unlock_mm(ttm, 1, 0);
}
break;
default:
break;
}
}
entry->state = ttm_evicted;
return 0;
}
void drm_unbind_ttm_region(drm_ttm_backend_list_t * entry)
{
drm_evict_ttm_region(entry);
entry->state = ttm_unbound;
}
/*
* Destroy and clean up all resources associated with a ttm region.
* FIXME: release pages to OS when doing this operation.
*/
void drm_destroy_ttm_region(drm_ttm_backend_list_t * entry)
{
drm_ttm_backend_t *be = entry->be;
drm_ttm_t *ttm = entry->owner;
uint32_t *cur_page_flags;
int i;
DRM_DEBUG("Destroying a TTM region\n");
list_del_init(&entry->head);
drm_unbind_ttm_region(entry);
if (be) {
be->clear(entry->be);
#if 0 /* Hmm, Isn't this done in unbind? */
if (be->needs_cache_adjust(be)) {
int ret = drm_ttm_lock_mmap_sem(ttm);
drm_ttm_lock_mm(ttm, 0, 1);
unmap_vma_pages(ttm, entry->page_offset,
entry->num_pages);
drm_ttm_unlock_mm(ttm, 0, 1);
drm_set_caching(ttm, entry->page_offset,
entry->num_pages, 0, 1);
if (!ret)
drm_ttm_unlock_mm(ttm, 1, 0);
}
#endif
be->destroy(be);
}
cur_page_flags = ttm->page_flags + entry->page_offset;
for (i = 0; i < entry->num_pages; ++i) {
DRM_MASK_VAL(*cur_page_flags, DRM_TTM_PAGE_USED, 0);
cur_page_flags++;
}
drm_free(entry, sizeof(*entry), DRM_MEM_TTM);
}
/*
* Create a ttm region from a range of ttm pages.
*/
int drm_create_ttm_region(drm_ttm_t * ttm, unsigned long page_offset,
unsigned long n_pages, int cached,
drm_ttm_backend_list_t ** region)
{
struct page **cur_page;
uint32_t *cur_page_flags;
drm_ttm_backend_list_t *entry;
drm_ttm_backend_t *be;
int ret, i;
if ((page_offset + n_pages) > ttm->num_pages || n_pages == 0) {
DRM_ERROR("Region Doesn't fit ttm\n");
return -EINVAL;
}
cur_page_flags = ttm->page_flags + page_offset;
for (i = 0; i < n_pages; ++i, ++cur_page_flags) {
if (*cur_page_flags & DRM_TTM_PAGE_USED) {
DRM_ERROR("TTM region overlap\n");
return -EINVAL;
} else {
DRM_MASK_VAL(*cur_page_flags, DRM_TTM_PAGE_USED,
DRM_TTM_PAGE_USED);
}
}
entry = drm_calloc(1, sizeof(*entry), DRM_MEM_TTM);
if (!entry)
return -ENOMEM;
be = ttm->dev->driver->bo_driver->create_ttm_backend_entry(ttm->dev,
cached);
if (!be) {
drm_free(entry, sizeof(*entry), DRM_MEM_TTM);
DRM_ERROR("Couldn't create backend.\n");
return -EINVAL;
}
entry->state = ttm_unbound;
entry->page_offset = page_offset;
entry->num_pages = n_pages;
entry->be = be;
entry->owner = ttm;
INIT_LIST_HEAD(&entry->head);
list_add_tail(&entry->head, &ttm->be_list->head);
for (i = 0; i < entry->num_pages; ++i) {
cur_page = ttm->pages + (page_offset + i);
if (!*cur_page) {
*cur_page = alloc_page(GFP_KERNEL);
if (!*cur_page) {
DRM_ERROR("Page allocation failed\n");
drm_destroy_ttm_region(entry);
return -ENOMEM;
}
SetPageReserved(*cur_page);
}
}
if ((ret = be->populate(be, n_pages, ttm->pages + page_offset))) {
drm_destroy_ttm_region(entry);
DRM_ERROR("Couldn't populate backend.\n");
return ret;
}
ttm->aperture_base = be->aperture_base;
*region = entry;
return 0;
}
/*
* Bind a ttm region. Set correct caching policy.
*/
int drm_bind_ttm_region(drm_ttm_backend_list_t * region,
unsigned long aper_offset)
{
int i;
uint32_t *cur_page_flag;
int ret = 0;
drm_ttm_backend_t *be;
drm_ttm_t *ttm;
if (!region || region->state == ttm_bound)
return -EINVAL;
be = region->be;
ttm = region->owner;
if (ttm && be->needs_cache_adjust(be)) {
ret = drm_ttm_lock_mmap_sem(ttm);
if (ret)
return ret;
drm_ttm_lock_mm(ttm, 0, 1);
unmap_vma_pages(ttm, region->page_offset,
region->num_pages);
drm_ttm_unlock_mm(ttm, 0, 1);
drm_set_caching(ttm, region->page_offset, region->num_pages,
DRM_TTM_PAGE_UNCACHED, 1);
} else {
DRM_DEBUG("Binding cached\n");
}
if ((ret = be->bind(be, aper_offset))) {
if (ttm && be->needs_cache_adjust(be))
drm_ttm_unlock_mm(ttm, 1, 0);
drm_unbind_ttm_region(region);
DRM_ERROR("Couldn't bind backend.\n");
return ret;
}
cur_page_flag = ttm->page_flags + region->page_offset;
for (i = 0; i < region->num_pages; ++i) {
DRM_MASK_VAL(*cur_page_flag, DRM_TTM_MASK_PFN,
(i + aper_offset) << PAGE_SHIFT);
cur_page_flag++;
}
if (ttm && be->needs_cache_adjust(be)) {
ioremap_vmas(ttm, region->page_offset, region->num_pages,
aper_offset);
drm_ttm_unlock_mm(ttm, 1, 0);
}
region->state = ttm_bound;
return 0;
}
int drm_rebind_ttm_region(drm_ttm_backend_list_t * entry,
unsigned long aper_offset)
{
return drm_bind_ttm_region(entry, aper_offset);
}
/*
* Destroy an anonymous ttm region.
*/
void drm_user_destroy_region(drm_ttm_backend_list_t * entry)
{
drm_ttm_backend_t *be;
struct page **cur_page;
int i;
if (!entry || entry->owner)
return;
be = entry->be;
if (!be) {
drm_free(entry, sizeof(*entry), DRM_MEM_TTM);
return;
}
be->unbind(be);
if (entry->anon_pages) {
cur_page = entry->anon_pages;
for (i = 0; i < entry->anon_locked; ++i) {
if (!PageReserved(*cur_page))
SetPageDirty(*cur_page);
page_cache_release(*cur_page);
cur_page++;
}
ttm_free(entry->anon_pages,
sizeof(*entry->anon_pages)*entry->anon_locked,
DRM_MEM_TTM, entry->pages_vmalloc);
}
be->destroy(be);
drm_free(entry, sizeof(*entry), DRM_MEM_TTM);
return;
}
/*
* Create a ttm region from an arbitrary region of user pages.
* Since this region has no backing ttm, it's owner is set to
* null, and it is registered with the file of the caller.
* Gets destroyed when the file is closed. We call this an
* anonymous ttm region.
*/
int drm_user_create_region(drm_device_t * dev, unsigned long start, int len,
drm_ttm_backend_list_t ** entry)
{
drm_ttm_backend_list_t *tmp;
drm_ttm_backend_t *be;
int ret;
if (len <= 0)
return -EINVAL;
if (!dev->driver->bo_driver->create_ttm_backend_entry)
return -EFAULT;
tmp = drm_calloc(1, sizeof(*tmp), DRM_MEM_TTM);
if (!tmp)
return -ENOMEM;
be = dev->driver->bo_driver->create_ttm_backend_entry(dev, 1);
tmp->be = be;
if (!be) {
drm_user_destroy_region(tmp);
return -ENOMEM;
}
if (be->needs_cache_adjust(be)) {
drm_user_destroy_region(tmp);
return -EFAULT;
}
tmp->anon_pages = ttm_alloc(sizeof(*(tmp->anon_pages)) * len,
DRM_MEM_TTM, &tmp->pages_vmalloc);
if (!tmp->anon_pages) {
drm_user_destroy_region(tmp);
return -ENOMEM;
}
down_read(&current->mm->mmap_sem);
ret = get_user_pages(current, current->mm, start, len, 1, 0,
tmp->anon_pages, NULL);
up_read(&current->mm->mmap_sem);
if (ret != len) {
drm_user_destroy_region(tmp);
DRM_ERROR("Could not lock %d pages. Return code was %d\n",
len, ret);
return -EPERM;
}
tmp->anon_locked = len;
ret = be->populate(be, len, tmp->anon_pages);
if (ret) {
drm_user_destroy_region(tmp);
return ret;
}
tmp->state = ttm_unbound;
*entry = tmp;
return 0;
}
/*
* dev->struct_mutex locked.
*/
static void drm_ttm_object_remove(drm_device_t * dev, drm_ttm_object_t * object)
{
drm_map_list_t *list = &object->map_list;
drm_local_map_t *map;
if (list->user_token)
drm_ht_remove_item(&dev->map_hash, &list->hash);
map = list->map;
if (map) {
drm_ttm_t *ttm = (drm_ttm_t *) map->offset;
if (ttm) {
if (drm_destroy_ttm(ttm) != -EBUSY) {
drm_free(map, sizeof(*map), DRM_MEM_TTM);
}
} else {
drm_free(map, sizeof(*map), DRM_MEM_TTM);
}
}
drm_free(object, sizeof(*object), DRM_MEM_TTM);
}
void drm_ttm_object_deref_locked(drm_device_t * dev, drm_ttm_object_t * to)
{
if (atomic_dec_and_test(&to->usage)) {
drm_ttm_object_remove(dev, to);
}
}
void drm_ttm_object_deref_unlocked(drm_device_t * dev, drm_ttm_object_t * to)
{
if (atomic_dec_and_test(&to->usage)) {
mutex_lock(&dev->struct_mutex);
if (atomic_read(&to->usage) == 0)
drm_ttm_object_remove(dev, to);
mutex_unlock(&dev->struct_mutex);
}
}
/*
* dev->struct_mutex locked.
*/
static void drm_ttm_user_deref_locked(drm_file_t * priv,
drm_user_object_t * base)
{
drm_ttm_object_deref_locked(priv->head->dev,
drm_user_object_entry(base,
drm_ttm_object_t,
base));
}
/*
* Create a ttm and add it to the drm book-keeping.
* dev->struct_mutex locked.
*/
int drm_ttm_object_create(drm_device_t * dev, unsigned long size,
uint32_t flags, drm_ttm_object_t ** ttm_object)
{
drm_ttm_object_t *object;
drm_map_list_t *list;
drm_map_t *map;
drm_ttm_t *ttm;
object = drm_calloc(1, sizeof(*object), DRM_MEM_TTM);
if (!object)
return -ENOMEM;
object->flags = flags;
list = &object->map_list;
list->map = drm_calloc(1, sizeof(*map), DRM_MEM_TTM);
if (!list->map) {
drm_ttm_object_remove(dev, object);
return -ENOMEM;
}
map = list->map;
ttm = drm_init_ttm(dev, size);
if (!ttm) {
DRM_ERROR("Could not create ttm\n");
drm_ttm_object_remove(dev, object);
return -ENOMEM;
}
map->offset = ttm->lhandle;
map->type = _DRM_TTM;
map->flags = _DRM_REMOVABLE;
map->size = ttm->num_pages * PAGE_SIZE;
map->handle = (void *)object;
if (drm_ht_just_insert_please(&dev->map_hash, &list->hash,
(unsigned long)map->handle,
32 - PAGE_SHIFT - 3, PAGE_SHIFT,
DRM_MAP_HASH_OFFSET)) {
drm_ttm_object_remove(dev, object);
return -ENOMEM;
}
list->user_token = list->hash.key;
atomic_set(&object->usage, 1);
*ttm_object = object;
return 0;
}
drm_ttm_object_t *drm_lookup_ttm_object(drm_file_t * priv, uint32_t handle,
int check_owner)
{
drm_user_object_t *uo;
drm_ttm_object_t *to;
uo = drm_lookup_user_object(priv, handle);
if (!uo || (uo->type != drm_ttm_type))
return NULL;
if (check_owner && priv != uo->owner) {
if (!drm_lookup_ref_object(priv, uo, _DRM_REF_USE))
return NULL;
}
to = drm_user_object_entry(uo, drm_ttm_object_t, base);
atomic_inc(&to->usage);
return to;
}
int drm_ttm_ioctl(DRM_IOCTL_ARGS)
{
DRM_DEVICE;
drm_ttm_arg_t arg;
drm_ttm_object_t *entry;
drm_user_object_t *uo;
unsigned long size;
int ret;
DRM_COPY_FROM_USER_IOCTL(arg, (void __user *)data, sizeof(arg));
switch (arg.op) {
case drm_ttm_create:
mutex_lock(&dev->struct_mutex);
size = arg.size;
ret = drm_ttm_object_create(dev, size, arg.flags, &entry);
if (ret) {
mutex_unlock(&dev->struct_mutex);
return ret;
}
ret = drm_add_user_object(priv, &entry->base,
arg.flags & DRM_TTM_FLAG_SHAREABLE);
if (ret) {
drm_ttm_object_remove(dev, entry);
mutex_unlock(&dev->struct_mutex);
return ret;
}
entry->base.remove = drm_ttm_user_deref_locked;
entry->base.type = drm_ttm_type;
entry->base.ref_struct_locked = NULL;
entry->base.unref = NULL;
atomic_inc(&entry->usage);
break;
case drm_ttm_reference:
ret = drm_user_object_ref(priv, arg.handle, drm_ttm_type, &uo);
if (ret)
return ret;
mutex_lock(&dev->struct_mutex);
entry = drm_lookup_ttm_object(priv, arg.handle, 0);
break;
case drm_ttm_unreference:
return drm_user_object_unref(priv, arg.handle, drm_ttm_type);
case drm_ttm_destroy:
mutex_lock(&dev->struct_mutex);
uo = drm_lookup_user_object(priv, arg.handle);
if (!uo || (uo->type != drm_ttm_type) || uo->owner != priv) {
mutex_unlock(&dev->struct_mutex);
return -EINVAL;
}
ret = drm_remove_user_object(priv, uo);
mutex_unlock(&dev->struct_mutex);
return ret;
}
arg.handle = entry->base.hash.key;
arg.user_token = entry->map_list.user_token;
arg.size = entry->map_list.map->size;
drm_ttm_object_deref_locked(dev, entry);
mutex_unlock(&dev->struct_mutex);
DRM_COPY_TO_USER_IOCTL((void __user *)data, arg, sizeof(arg));
return 0;
}
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