linux_dsm_epyc7002/drivers/gpu/drm/ttm/ttm_bo_manager.c
Kees Cook 4e98c378a1 drm/ttm: use designated initializers
Prepare to mark sensitive kernel structures for randomization by making
sure they're using designated initializers. These were identified during
allyesconfig builds of x86, arm, and arm64, with most initializer fixes
extracted from grsecurity.

Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/20161217010011.GA140300@beast
2016-12-18 14:48:26 +01:00

158 lines
4.4 KiB
C

/**************************************************************************
*
* Copyright (c) 2007-2010 VMware, Inc., Palo Alto, CA., 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 above copyright notice and this permission notice (including the
* next paragraph) 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 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.
*
**************************************************************************/
/*
* Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
*/
#include <drm/ttm/ttm_module.h>
#include <drm/ttm/ttm_bo_driver.h>
#include <drm/ttm/ttm_placement.h>
#include <drm/drm_mm.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/module.h>
/**
* Currently we use a spinlock for the lock, but a mutex *may* be
* more appropriate to reduce scheduling latency if the range manager
* ends up with very fragmented allocation patterns.
*/
struct ttm_range_manager {
struct drm_mm mm;
spinlock_t lock;
};
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)
{
struct ttm_range_manager *rman = (struct ttm_range_manager *) man->priv;
struct drm_mm *mm = &rman->mm;
struct drm_mm_node *node = NULL;
enum drm_mm_search_flags sflags = DRM_MM_SEARCH_BEST;
enum drm_mm_allocator_flags aflags = DRM_MM_CREATE_DEFAULT;
unsigned long lpfn;
int ret;
lpfn = place->lpfn;
if (!lpfn)
lpfn = man->size;
node = kzalloc(sizeof(*node), GFP_KERNEL);
if (!node)
return -ENOMEM;
if (place->flags & TTM_PL_FLAG_TOPDOWN) {
sflags = DRM_MM_SEARCH_BELOW;
aflags = DRM_MM_CREATE_TOP;
}
spin_lock(&rman->lock);
ret = drm_mm_insert_node_in_range_generic(mm, node, mem->num_pages,
mem->page_alignment, 0,
place->fpfn, lpfn,
sflags, aflags);
spin_unlock(&rman->lock);
if (unlikely(ret)) {
kfree(node);
} else {
mem->mm_node = node;
mem->start = node->start;
}
return 0;
}
static void ttm_bo_man_put_node(struct ttm_mem_type_manager *man,
struct ttm_mem_reg *mem)
{
struct ttm_range_manager *rman = (struct ttm_range_manager *) man->priv;
if (mem->mm_node) {
spin_lock(&rman->lock);
drm_mm_remove_node(mem->mm_node);
spin_unlock(&rman->lock);
kfree(mem->mm_node);
mem->mm_node = NULL;
}
}
static int ttm_bo_man_init(struct ttm_mem_type_manager *man,
unsigned long p_size)
{
struct ttm_range_manager *rman;
rman = kzalloc(sizeof(*rman), GFP_KERNEL);
if (!rman)
return -ENOMEM;
drm_mm_init(&rman->mm, 0, p_size);
spin_lock_init(&rman->lock);
man->priv = rman;
return 0;
}
static int ttm_bo_man_takedown(struct ttm_mem_type_manager *man)
{
struct ttm_range_manager *rman = (struct ttm_range_manager *) man->priv;
struct drm_mm *mm = &rman->mm;
spin_lock(&rman->lock);
if (drm_mm_clean(mm)) {
drm_mm_takedown(mm);
spin_unlock(&rman->lock);
kfree(rman);
man->priv = NULL;
return 0;
}
spin_unlock(&rman->lock);
return -EBUSY;
}
static void ttm_bo_man_debug(struct ttm_mem_type_manager *man,
const char *prefix)
{
struct ttm_range_manager *rman = (struct ttm_range_manager *) man->priv;
spin_lock(&rman->lock);
drm_mm_debug_table(&rman->mm, prefix);
spin_unlock(&rman->lock);
}
const struct ttm_mem_type_manager_func ttm_bo_manager_func = {
.init = ttm_bo_man_init,
.takedown = ttm_bo_man_takedown,
.get_node = ttm_bo_man_get_node,
.put_node = ttm_bo_man_put_node,
.debug = ttm_bo_man_debug
};
EXPORT_SYMBOL(ttm_bo_manager_func);