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![Kees Cook](/assets/img/avatar_default.png)
While zone->name is currently hard coded, the call to kobject_init_and_add() should follow the more defensive argument list usage (as already done in other places in ttm_memory.c) where "%s" is used instead of directly passing in a variable as a format string. Signed-off-by: Kees Cook <keescook@chromium.org> Signed-off-by: Dave Airlie <airlied@redhat.com>
602 lines
14 KiB
C
602 lines
14 KiB
C
/**************************************************************************
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*
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* Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA
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* All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sub license, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice (including the
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* next paragraph) shall be included in all copies or substantial portions
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* of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
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* THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
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* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
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* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
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* USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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**************************************************************************/
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#define pr_fmt(fmt) "[TTM] " fmt
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#include <drm/ttm/ttm_memory.h>
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#include <drm/ttm/ttm_module.h>
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#include <drm/ttm/ttm_page_alloc.h>
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#include <linux/spinlock.h>
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#include <linux/sched.h>
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#include <linux/wait.h>
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#include <linux/mm.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#define TTM_MEMORY_ALLOC_RETRIES 4
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struct ttm_mem_zone {
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struct kobject kobj;
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struct ttm_mem_global *glob;
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const char *name;
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uint64_t zone_mem;
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uint64_t emer_mem;
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uint64_t max_mem;
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uint64_t swap_limit;
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uint64_t used_mem;
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};
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static struct attribute ttm_mem_sys = {
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.name = "zone_memory",
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.mode = S_IRUGO
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};
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static struct attribute ttm_mem_emer = {
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.name = "emergency_memory",
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.mode = S_IRUGO | S_IWUSR
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};
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static struct attribute ttm_mem_max = {
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.name = "available_memory",
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.mode = S_IRUGO | S_IWUSR
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};
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static struct attribute ttm_mem_swap = {
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.name = "swap_limit",
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.mode = S_IRUGO | S_IWUSR
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};
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static struct attribute ttm_mem_used = {
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.name = "used_memory",
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.mode = S_IRUGO
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};
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static void ttm_mem_zone_kobj_release(struct kobject *kobj)
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{
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struct ttm_mem_zone *zone =
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container_of(kobj, struct ttm_mem_zone, kobj);
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pr_info("Zone %7s: Used memory at exit: %llu kiB\n",
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zone->name, (unsigned long long)zone->used_mem >> 10);
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kfree(zone);
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}
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static ssize_t ttm_mem_zone_show(struct kobject *kobj,
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struct attribute *attr,
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char *buffer)
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{
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struct ttm_mem_zone *zone =
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container_of(kobj, struct ttm_mem_zone, kobj);
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uint64_t val = 0;
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spin_lock(&zone->glob->lock);
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if (attr == &ttm_mem_sys)
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val = zone->zone_mem;
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else if (attr == &ttm_mem_emer)
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val = zone->emer_mem;
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else if (attr == &ttm_mem_max)
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val = zone->max_mem;
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else if (attr == &ttm_mem_swap)
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val = zone->swap_limit;
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else if (attr == &ttm_mem_used)
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val = zone->used_mem;
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spin_unlock(&zone->glob->lock);
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return snprintf(buffer, PAGE_SIZE, "%llu\n",
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(unsigned long long) val >> 10);
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}
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static void ttm_check_swapping(struct ttm_mem_global *glob);
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static ssize_t ttm_mem_zone_store(struct kobject *kobj,
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struct attribute *attr,
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const char *buffer,
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size_t size)
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{
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struct ttm_mem_zone *zone =
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container_of(kobj, struct ttm_mem_zone, kobj);
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int chars;
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unsigned long val;
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uint64_t val64;
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chars = sscanf(buffer, "%lu", &val);
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if (chars == 0)
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return size;
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val64 = val;
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val64 <<= 10;
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spin_lock(&zone->glob->lock);
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if (val64 > zone->zone_mem)
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val64 = zone->zone_mem;
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if (attr == &ttm_mem_emer) {
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zone->emer_mem = val64;
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if (zone->max_mem > val64)
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zone->max_mem = val64;
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} else if (attr == &ttm_mem_max) {
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zone->max_mem = val64;
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if (zone->emer_mem < val64)
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zone->emer_mem = val64;
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} else if (attr == &ttm_mem_swap)
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zone->swap_limit = val64;
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spin_unlock(&zone->glob->lock);
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ttm_check_swapping(zone->glob);
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return size;
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}
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static struct attribute *ttm_mem_zone_attrs[] = {
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&ttm_mem_sys,
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&ttm_mem_emer,
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&ttm_mem_max,
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&ttm_mem_swap,
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&ttm_mem_used,
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NULL
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};
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static const struct sysfs_ops ttm_mem_zone_ops = {
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.show = &ttm_mem_zone_show,
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.store = &ttm_mem_zone_store
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};
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static struct kobj_type ttm_mem_zone_kobj_type = {
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.release = &ttm_mem_zone_kobj_release,
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.sysfs_ops = &ttm_mem_zone_ops,
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.default_attrs = ttm_mem_zone_attrs,
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};
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static void ttm_mem_global_kobj_release(struct kobject *kobj)
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{
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struct ttm_mem_global *glob =
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container_of(kobj, struct ttm_mem_global, kobj);
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kfree(glob);
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}
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static struct kobj_type ttm_mem_glob_kobj_type = {
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.release = &ttm_mem_global_kobj_release,
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};
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static bool ttm_zones_above_swap_target(struct ttm_mem_global *glob,
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bool from_wq, uint64_t extra)
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{
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unsigned int i;
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struct ttm_mem_zone *zone;
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uint64_t target;
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for (i = 0; i < glob->num_zones; ++i) {
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zone = glob->zones[i];
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if (from_wq)
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target = zone->swap_limit;
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else if (capable(CAP_SYS_ADMIN))
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target = zone->emer_mem;
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else
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target = zone->max_mem;
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target = (extra > target) ? 0ULL : target;
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if (zone->used_mem > target)
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return true;
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}
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return false;
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}
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/**
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* At this point we only support a single shrink callback.
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* Extend this if needed, perhaps using a linked list of callbacks.
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* Note that this function is reentrant:
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* many threads may try to swap out at any given time.
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*/
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static void ttm_shrink(struct ttm_mem_global *glob, bool from_wq,
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uint64_t extra)
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{
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int ret;
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struct ttm_mem_shrink *shrink;
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spin_lock(&glob->lock);
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if (glob->shrink == NULL)
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goto out;
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while (ttm_zones_above_swap_target(glob, from_wq, extra)) {
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shrink = glob->shrink;
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spin_unlock(&glob->lock);
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ret = shrink->do_shrink(shrink);
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spin_lock(&glob->lock);
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if (unlikely(ret != 0))
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goto out;
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}
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out:
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spin_unlock(&glob->lock);
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}
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static void ttm_shrink_work(struct work_struct *work)
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{
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struct ttm_mem_global *glob =
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container_of(work, struct ttm_mem_global, work);
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ttm_shrink(glob, true, 0ULL);
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}
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static int ttm_mem_init_kernel_zone(struct ttm_mem_global *glob,
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const struct sysinfo *si)
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{
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struct ttm_mem_zone *zone = kzalloc(sizeof(*zone), GFP_KERNEL);
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uint64_t mem;
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int ret;
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if (unlikely(!zone))
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return -ENOMEM;
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mem = si->totalram - si->totalhigh;
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mem *= si->mem_unit;
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zone->name = "kernel";
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zone->zone_mem = mem;
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zone->max_mem = mem >> 1;
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zone->emer_mem = (mem >> 1) + (mem >> 2);
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zone->swap_limit = zone->max_mem - (mem >> 3);
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zone->used_mem = 0;
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zone->glob = glob;
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glob->zone_kernel = zone;
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ret = kobject_init_and_add(
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&zone->kobj, &ttm_mem_zone_kobj_type, &glob->kobj, zone->name);
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if (unlikely(ret != 0)) {
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kobject_put(&zone->kobj);
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return ret;
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}
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glob->zones[glob->num_zones++] = zone;
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return 0;
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}
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#ifdef CONFIG_HIGHMEM
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static int ttm_mem_init_highmem_zone(struct ttm_mem_global *glob,
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const struct sysinfo *si)
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{
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struct ttm_mem_zone *zone;
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uint64_t mem;
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int ret;
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if (si->totalhigh == 0)
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return 0;
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zone = kzalloc(sizeof(*zone), GFP_KERNEL);
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if (unlikely(!zone))
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return -ENOMEM;
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mem = si->totalram;
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mem *= si->mem_unit;
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zone->name = "highmem";
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zone->zone_mem = mem;
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zone->max_mem = mem >> 1;
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zone->emer_mem = (mem >> 1) + (mem >> 2);
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zone->swap_limit = zone->max_mem - (mem >> 3);
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zone->used_mem = 0;
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zone->glob = glob;
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glob->zone_highmem = zone;
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ret = kobject_init_and_add(
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&zone->kobj, &ttm_mem_zone_kobj_type, &glob->kobj, "%s",
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zone->name);
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if (unlikely(ret != 0)) {
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kobject_put(&zone->kobj);
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return ret;
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}
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glob->zones[glob->num_zones++] = zone;
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return 0;
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}
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#else
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static int ttm_mem_init_dma32_zone(struct ttm_mem_global *glob,
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const struct sysinfo *si)
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{
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struct ttm_mem_zone *zone = kzalloc(sizeof(*zone), GFP_KERNEL);
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uint64_t mem;
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int ret;
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if (unlikely(!zone))
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return -ENOMEM;
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mem = si->totalram;
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mem *= si->mem_unit;
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/**
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* No special dma32 zone needed.
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*/
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if (mem <= ((uint64_t) 1ULL << 32)) {
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kfree(zone);
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return 0;
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}
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/*
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* Limit max dma32 memory to 4GB for now
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* until we can figure out how big this
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* zone really is.
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*/
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mem = ((uint64_t) 1ULL << 32);
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zone->name = "dma32";
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zone->zone_mem = mem;
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zone->max_mem = mem >> 1;
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zone->emer_mem = (mem >> 1) + (mem >> 2);
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zone->swap_limit = zone->max_mem - (mem >> 3);
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zone->used_mem = 0;
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zone->glob = glob;
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glob->zone_dma32 = zone;
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ret = kobject_init_and_add(
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&zone->kobj, &ttm_mem_zone_kobj_type, &glob->kobj, zone->name);
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if (unlikely(ret != 0)) {
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kobject_put(&zone->kobj);
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return ret;
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}
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glob->zones[glob->num_zones++] = zone;
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return 0;
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}
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#endif
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int ttm_mem_global_init(struct ttm_mem_global *glob)
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{
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struct sysinfo si;
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int ret;
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int i;
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struct ttm_mem_zone *zone;
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spin_lock_init(&glob->lock);
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glob->swap_queue = create_singlethread_workqueue("ttm_swap");
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INIT_WORK(&glob->work, ttm_shrink_work);
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ret = kobject_init_and_add(
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&glob->kobj, &ttm_mem_glob_kobj_type, ttm_get_kobj(), "memory_accounting");
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if (unlikely(ret != 0)) {
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kobject_put(&glob->kobj);
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return ret;
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}
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si_meminfo(&si);
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ret = ttm_mem_init_kernel_zone(glob, &si);
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if (unlikely(ret != 0))
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goto out_no_zone;
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#ifdef CONFIG_HIGHMEM
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ret = ttm_mem_init_highmem_zone(glob, &si);
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if (unlikely(ret != 0))
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goto out_no_zone;
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#else
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ret = ttm_mem_init_dma32_zone(glob, &si);
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if (unlikely(ret != 0))
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goto out_no_zone;
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#endif
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for (i = 0; i < glob->num_zones; ++i) {
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zone = glob->zones[i];
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pr_info("Zone %7s: Available graphics memory: %llu kiB\n",
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zone->name, (unsigned long long)zone->max_mem >> 10);
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}
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ttm_page_alloc_init(glob, glob->zone_kernel->max_mem/(2*PAGE_SIZE));
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ttm_dma_page_alloc_init(glob, glob->zone_kernel->max_mem/(2*PAGE_SIZE));
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return 0;
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out_no_zone:
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ttm_mem_global_release(glob);
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return ret;
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}
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EXPORT_SYMBOL(ttm_mem_global_init);
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void ttm_mem_global_release(struct ttm_mem_global *glob)
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{
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unsigned int i;
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struct ttm_mem_zone *zone;
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/* let the page allocator first stop the shrink work. */
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ttm_page_alloc_fini();
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ttm_dma_page_alloc_fini();
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flush_workqueue(glob->swap_queue);
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destroy_workqueue(glob->swap_queue);
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glob->swap_queue = NULL;
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for (i = 0; i < glob->num_zones; ++i) {
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zone = glob->zones[i];
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kobject_del(&zone->kobj);
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kobject_put(&zone->kobj);
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}
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kobject_del(&glob->kobj);
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kobject_put(&glob->kobj);
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}
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EXPORT_SYMBOL(ttm_mem_global_release);
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static void ttm_check_swapping(struct ttm_mem_global *glob)
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{
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bool needs_swapping = false;
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unsigned int i;
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struct ttm_mem_zone *zone;
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spin_lock(&glob->lock);
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for (i = 0; i < glob->num_zones; ++i) {
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zone = glob->zones[i];
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if (zone->used_mem > zone->swap_limit) {
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needs_swapping = true;
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break;
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}
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}
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spin_unlock(&glob->lock);
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if (unlikely(needs_swapping))
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(void)queue_work(glob->swap_queue, &glob->work);
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}
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static void ttm_mem_global_free_zone(struct ttm_mem_global *glob,
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struct ttm_mem_zone *single_zone,
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uint64_t amount)
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{
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unsigned int i;
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struct ttm_mem_zone *zone;
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spin_lock(&glob->lock);
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for (i = 0; i < glob->num_zones; ++i) {
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zone = glob->zones[i];
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if (single_zone && zone != single_zone)
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continue;
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zone->used_mem -= amount;
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}
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spin_unlock(&glob->lock);
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}
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void ttm_mem_global_free(struct ttm_mem_global *glob,
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uint64_t amount)
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{
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return ttm_mem_global_free_zone(glob, NULL, amount);
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}
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EXPORT_SYMBOL(ttm_mem_global_free);
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static int ttm_mem_global_reserve(struct ttm_mem_global *glob,
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struct ttm_mem_zone *single_zone,
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uint64_t amount, bool reserve)
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{
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uint64_t limit;
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int ret = -ENOMEM;
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unsigned int i;
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struct ttm_mem_zone *zone;
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spin_lock(&glob->lock);
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for (i = 0; i < glob->num_zones; ++i) {
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zone = glob->zones[i];
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if (single_zone && zone != single_zone)
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continue;
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limit = (capable(CAP_SYS_ADMIN)) ?
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zone->emer_mem : zone->max_mem;
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if (zone->used_mem > limit)
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goto out_unlock;
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}
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if (reserve) {
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for (i = 0; i < glob->num_zones; ++i) {
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zone = glob->zones[i];
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if (single_zone && zone != single_zone)
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continue;
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zone->used_mem += amount;
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}
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}
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ret = 0;
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out_unlock:
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spin_unlock(&glob->lock);
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ttm_check_swapping(glob);
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return ret;
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}
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static int ttm_mem_global_alloc_zone(struct ttm_mem_global *glob,
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struct ttm_mem_zone *single_zone,
|
|
uint64_t memory,
|
|
bool no_wait, bool interruptible)
|
|
{
|
|
int count = TTM_MEMORY_ALLOC_RETRIES;
|
|
|
|
while (unlikely(ttm_mem_global_reserve(glob,
|
|
single_zone,
|
|
memory, true)
|
|
!= 0)) {
|
|
if (no_wait)
|
|
return -ENOMEM;
|
|
if (unlikely(count-- == 0))
|
|
return -ENOMEM;
|
|
ttm_shrink(glob, false, memory + (memory >> 2) + 16);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int ttm_mem_global_alloc(struct ttm_mem_global *glob, uint64_t memory,
|
|
bool no_wait, bool interruptible)
|
|
{
|
|
/**
|
|
* Normal allocations of kernel memory are registered in
|
|
* all zones.
|
|
*/
|
|
|
|
return ttm_mem_global_alloc_zone(glob, NULL, memory, no_wait,
|
|
interruptible);
|
|
}
|
|
EXPORT_SYMBOL(ttm_mem_global_alloc);
|
|
|
|
int ttm_mem_global_alloc_page(struct ttm_mem_global *glob,
|
|
struct page *page,
|
|
bool no_wait, bool interruptible)
|
|
{
|
|
|
|
struct ttm_mem_zone *zone = NULL;
|
|
|
|
/**
|
|
* Page allocations may be registed in a single zone
|
|
* only if highmem or !dma32.
|
|
*/
|
|
|
|
#ifdef CONFIG_HIGHMEM
|
|
if (PageHighMem(page) && glob->zone_highmem != NULL)
|
|
zone = glob->zone_highmem;
|
|
#else
|
|
if (glob->zone_dma32 && page_to_pfn(page) > 0x00100000UL)
|
|
zone = glob->zone_kernel;
|
|
#endif
|
|
return ttm_mem_global_alloc_zone(glob, zone, PAGE_SIZE, no_wait,
|
|
interruptible);
|
|
}
|
|
|
|
void ttm_mem_global_free_page(struct ttm_mem_global *glob, struct page *page)
|
|
{
|
|
struct ttm_mem_zone *zone = NULL;
|
|
|
|
#ifdef CONFIG_HIGHMEM
|
|
if (PageHighMem(page) && glob->zone_highmem != NULL)
|
|
zone = glob->zone_highmem;
|
|
#else
|
|
if (glob->zone_dma32 && page_to_pfn(page) > 0x00100000UL)
|
|
zone = glob->zone_kernel;
|
|
#endif
|
|
ttm_mem_global_free_zone(glob, zone, PAGE_SIZE);
|
|
}
|
|
|
|
|
|
size_t ttm_round_pot(size_t size)
|
|
{
|
|
if ((size & (size - 1)) == 0)
|
|
return size;
|
|
else if (size > PAGE_SIZE)
|
|
return PAGE_ALIGN(size);
|
|
else {
|
|
size_t tmp_size = 4;
|
|
|
|
while (tmp_size < size)
|
|
tmp_size <<= 1;
|
|
|
|
return tmp_size;
|
|
}
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(ttm_round_pot);
|