mirror of https://github.com/Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
683 lines
16 KiB
683 lines
16 KiB
/* SPDX-License-Identifier: GPL-2.0 OR MIT */ |
|
/************************************************************************** |
|
* |
|
* Copyright (c) 2006-2009 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. |
|
* |
|
**************************************************************************/ |
|
|
|
#define pr_fmt(fmt) "[TTM] " fmt |
|
|
|
#include <drm/ttm/ttm_memory.h> |
|
#include <drm/ttm/ttm_module.h> |
|
#include <drm/ttm/ttm_page_alloc.h> |
|
#include <linux/spinlock.h> |
|
#include <linux/sched.h> |
|
#include <linux/wait.h> |
|
#include <linux/mm.h> |
|
#include <linux/module.h> |
|
#include <linux/slab.h> |
|
#include <linux/swap.h> |
|
|
|
#define TTM_MEMORY_ALLOC_RETRIES 4 |
|
|
|
struct ttm_mem_global ttm_mem_glob; |
|
EXPORT_SYMBOL(ttm_mem_glob); |
|
|
|
struct ttm_mem_zone { |
|
struct kobject kobj; |
|
struct ttm_mem_global *glob; |
|
const char *name; |
|
uint64_t zone_mem; |
|
uint64_t emer_mem; |
|
uint64_t max_mem; |
|
uint64_t swap_limit; |
|
uint64_t used_mem; |
|
}; |
|
|
|
static struct attribute ttm_mem_sys = { |
|
.name = "zone_memory", |
|
.mode = S_IRUGO |
|
}; |
|
static struct attribute ttm_mem_emer = { |
|
.name = "emergency_memory", |
|
.mode = S_IRUGO | S_IWUSR |
|
}; |
|
static struct attribute ttm_mem_max = { |
|
.name = "available_memory", |
|
.mode = S_IRUGO | S_IWUSR |
|
}; |
|
static struct attribute ttm_mem_swap = { |
|
.name = "swap_limit", |
|
.mode = S_IRUGO | S_IWUSR |
|
}; |
|
static struct attribute ttm_mem_used = { |
|
.name = "used_memory", |
|
.mode = S_IRUGO |
|
}; |
|
|
|
static void ttm_mem_zone_kobj_release(struct kobject *kobj) |
|
{ |
|
struct ttm_mem_zone *zone = |
|
container_of(kobj, struct ttm_mem_zone, kobj); |
|
|
|
pr_info("Zone %7s: Used memory at exit: %llu KiB\n", |
|
zone->name, (unsigned long long)zone->used_mem >> 10); |
|
kfree(zone); |
|
} |
|
|
|
static ssize_t ttm_mem_zone_show(struct kobject *kobj, |
|
struct attribute *attr, |
|
char *buffer) |
|
{ |
|
struct ttm_mem_zone *zone = |
|
container_of(kobj, struct ttm_mem_zone, kobj); |
|
uint64_t val = 0; |
|
|
|
spin_lock(&zone->glob->lock); |
|
if (attr == &ttm_mem_sys) |
|
val = zone->zone_mem; |
|
else if (attr == &ttm_mem_emer) |
|
val = zone->emer_mem; |
|
else if (attr == &ttm_mem_max) |
|
val = zone->max_mem; |
|
else if (attr == &ttm_mem_swap) |
|
val = zone->swap_limit; |
|
else if (attr == &ttm_mem_used) |
|
val = zone->used_mem; |
|
spin_unlock(&zone->glob->lock); |
|
|
|
return snprintf(buffer, PAGE_SIZE, "%llu\n", |
|
(unsigned long long) val >> 10); |
|
} |
|
|
|
static void ttm_check_swapping(struct ttm_mem_global *glob); |
|
|
|
static ssize_t ttm_mem_zone_store(struct kobject *kobj, |
|
struct attribute *attr, |
|
const char *buffer, |
|
size_t size) |
|
{ |
|
struct ttm_mem_zone *zone = |
|
container_of(kobj, struct ttm_mem_zone, kobj); |
|
int chars; |
|
unsigned long val; |
|
uint64_t val64; |
|
|
|
chars = sscanf(buffer, "%lu", &val); |
|
if (chars == 0) |
|
return size; |
|
|
|
val64 = val; |
|
val64 <<= 10; |
|
|
|
spin_lock(&zone->glob->lock); |
|
if (val64 > zone->zone_mem) |
|
val64 = zone->zone_mem; |
|
if (attr == &ttm_mem_emer) { |
|
zone->emer_mem = val64; |
|
if (zone->max_mem > val64) |
|
zone->max_mem = val64; |
|
} else if (attr == &ttm_mem_max) { |
|
zone->max_mem = val64; |
|
if (zone->emer_mem < val64) |
|
zone->emer_mem = val64; |
|
} else if (attr == &ttm_mem_swap) |
|
zone->swap_limit = val64; |
|
spin_unlock(&zone->glob->lock); |
|
|
|
ttm_check_swapping(zone->glob); |
|
|
|
return size; |
|
} |
|
|
|
static struct attribute *ttm_mem_zone_attrs[] = { |
|
&ttm_mem_sys, |
|
&ttm_mem_emer, |
|
&ttm_mem_max, |
|
&ttm_mem_swap, |
|
&ttm_mem_used, |
|
NULL |
|
}; |
|
|
|
static const struct sysfs_ops ttm_mem_zone_ops = { |
|
.show = &ttm_mem_zone_show, |
|
.store = &ttm_mem_zone_store |
|
}; |
|
|
|
static struct kobj_type ttm_mem_zone_kobj_type = { |
|
.release = &ttm_mem_zone_kobj_release, |
|
.sysfs_ops = &ttm_mem_zone_ops, |
|
.default_attrs = ttm_mem_zone_attrs, |
|
}; |
|
|
|
static struct attribute ttm_mem_global_lower_mem_limit = { |
|
.name = "lower_mem_limit", |
|
.mode = S_IRUGO | S_IWUSR |
|
}; |
|
|
|
static ssize_t ttm_mem_global_show(struct kobject *kobj, |
|
struct attribute *attr, |
|
char *buffer) |
|
{ |
|
struct ttm_mem_global *glob = |
|
container_of(kobj, struct ttm_mem_global, kobj); |
|
uint64_t val = 0; |
|
|
|
spin_lock(&glob->lock); |
|
val = glob->lower_mem_limit; |
|
spin_unlock(&glob->lock); |
|
/* convert from number of pages to KB */ |
|
val <<= (PAGE_SHIFT - 10); |
|
return snprintf(buffer, PAGE_SIZE, "%llu\n", |
|
(unsigned long long) val); |
|
} |
|
|
|
static ssize_t ttm_mem_global_store(struct kobject *kobj, |
|
struct attribute *attr, |
|
const char *buffer, |
|
size_t size) |
|
{ |
|
int chars; |
|
uint64_t val64; |
|
unsigned long val; |
|
struct ttm_mem_global *glob = |
|
container_of(kobj, struct ttm_mem_global, kobj); |
|
|
|
chars = sscanf(buffer, "%lu", &val); |
|
if (chars == 0) |
|
return size; |
|
|
|
val64 = val; |
|
/* convert from KB to number of pages */ |
|
val64 >>= (PAGE_SHIFT - 10); |
|
|
|
spin_lock(&glob->lock); |
|
glob->lower_mem_limit = val64; |
|
spin_unlock(&glob->lock); |
|
|
|
return size; |
|
} |
|
|
|
static struct attribute *ttm_mem_global_attrs[] = { |
|
&ttm_mem_global_lower_mem_limit, |
|
NULL |
|
}; |
|
|
|
static const struct sysfs_ops ttm_mem_global_ops = { |
|
.show = &ttm_mem_global_show, |
|
.store = &ttm_mem_global_store, |
|
}; |
|
|
|
static struct kobj_type ttm_mem_glob_kobj_type = { |
|
.sysfs_ops = &ttm_mem_global_ops, |
|
.default_attrs = ttm_mem_global_attrs, |
|
}; |
|
|
|
static bool ttm_zones_above_swap_target(struct ttm_mem_global *glob, |
|
bool from_wq, uint64_t extra) |
|
{ |
|
unsigned int i; |
|
struct ttm_mem_zone *zone; |
|
uint64_t target; |
|
|
|
for (i = 0; i < glob->num_zones; ++i) { |
|
zone = glob->zones[i]; |
|
|
|
if (from_wq) |
|
target = zone->swap_limit; |
|
else if (capable(CAP_SYS_ADMIN)) |
|
target = zone->emer_mem; |
|
else |
|
target = zone->max_mem; |
|
|
|
target = (extra > target) ? 0ULL : target; |
|
|
|
if (zone->used_mem > target) |
|
return true; |
|
} |
|
return false; |
|
} |
|
|
|
/* |
|
* At this point we only support a single shrink callback. |
|
* Extend this if needed, perhaps using a linked list of callbacks. |
|
* Note that this function is reentrant: |
|
* many threads may try to swap out at any given time. |
|
*/ |
|
|
|
static void ttm_shrink(struct ttm_mem_global *glob, bool from_wq, |
|
uint64_t extra, struct ttm_operation_ctx *ctx) |
|
{ |
|
int ret; |
|
|
|
spin_lock(&glob->lock); |
|
|
|
while (ttm_zones_above_swap_target(glob, from_wq, extra)) { |
|
spin_unlock(&glob->lock); |
|
ret = ttm_bo_swapout(&ttm_bo_glob, ctx); |
|
spin_lock(&glob->lock); |
|
if (unlikely(ret != 0)) |
|
break; |
|
} |
|
|
|
spin_unlock(&glob->lock); |
|
} |
|
|
|
static void ttm_shrink_work(struct work_struct *work) |
|
{ |
|
struct ttm_operation_ctx ctx = { |
|
.interruptible = false, |
|
.no_wait_gpu = false |
|
}; |
|
struct ttm_mem_global *glob = |
|
container_of(work, struct ttm_mem_global, work); |
|
|
|
ttm_shrink(glob, true, 0ULL, &ctx); |
|
} |
|
|
|
static int ttm_mem_init_kernel_zone(struct ttm_mem_global *glob, |
|
const struct sysinfo *si) |
|
{ |
|
struct ttm_mem_zone *zone = kzalloc(sizeof(*zone), GFP_KERNEL); |
|
uint64_t mem; |
|
int ret; |
|
|
|
if (unlikely(!zone)) |
|
return -ENOMEM; |
|
|
|
mem = si->totalram - si->totalhigh; |
|
mem *= si->mem_unit; |
|
|
|
zone->name = "kernel"; |
|
zone->zone_mem = mem; |
|
zone->max_mem = mem >> 1; |
|
zone->emer_mem = (mem >> 1) + (mem >> 2); |
|
zone->swap_limit = zone->max_mem - (mem >> 3); |
|
zone->used_mem = 0; |
|
zone->glob = glob; |
|
glob->zone_kernel = zone; |
|
ret = kobject_init_and_add( |
|
&zone->kobj, &ttm_mem_zone_kobj_type, &glob->kobj, zone->name); |
|
if (unlikely(ret != 0)) { |
|
kobject_put(&zone->kobj); |
|
return ret; |
|
} |
|
glob->zones[glob->num_zones++] = zone; |
|
return 0; |
|
} |
|
|
|
#ifdef CONFIG_HIGHMEM |
|
static int ttm_mem_init_highmem_zone(struct ttm_mem_global *glob, |
|
const struct sysinfo *si) |
|
{ |
|
struct ttm_mem_zone *zone; |
|
uint64_t mem; |
|
int ret; |
|
|
|
if (si->totalhigh == 0) |
|
return 0; |
|
|
|
zone = kzalloc(sizeof(*zone), GFP_KERNEL); |
|
if (unlikely(!zone)) |
|
return -ENOMEM; |
|
|
|
mem = si->totalram; |
|
mem *= si->mem_unit; |
|
|
|
zone->name = "highmem"; |
|
zone->zone_mem = mem; |
|
zone->max_mem = mem >> 1; |
|
zone->emer_mem = (mem >> 1) + (mem >> 2); |
|
zone->swap_limit = zone->max_mem - (mem >> 3); |
|
zone->used_mem = 0; |
|
zone->glob = glob; |
|
glob->zone_highmem = zone; |
|
ret = kobject_init_and_add( |
|
&zone->kobj, &ttm_mem_zone_kobj_type, &glob->kobj, "%s", |
|
zone->name); |
|
if (unlikely(ret != 0)) { |
|
kobject_put(&zone->kobj); |
|
return ret; |
|
} |
|
glob->zones[glob->num_zones++] = zone; |
|
return 0; |
|
} |
|
#else |
|
static int ttm_mem_init_dma32_zone(struct ttm_mem_global *glob, |
|
const struct sysinfo *si) |
|
{ |
|
struct ttm_mem_zone *zone = kzalloc(sizeof(*zone), GFP_KERNEL); |
|
uint64_t mem; |
|
int ret; |
|
|
|
if (unlikely(!zone)) |
|
return -ENOMEM; |
|
|
|
mem = si->totalram; |
|
mem *= si->mem_unit; |
|
|
|
/** |
|
* No special dma32 zone needed. |
|
*/ |
|
|
|
if (mem <= ((uint64_t) 1ULL << 32)) { |
|
kfree(zone); |
|
return 0; |
|
} |
|
|
|
/* |
|
* Limit max dma32 memory to 4GB for now |
|
* until we can figure out how big this |
|
* zone really is. |
|
*/ |
|
|
|
mem = ((uint64_t) 1ULL << 32); |
|
zone->name = "dma32"; |
|
zone->zone_mem = mem; |
|
zone->max_mem = mem >> 1; |
|
zone->emer_mem = (mem >> 1) + (mem >> 2); |
|
zone->swap_limit = zone->max_mem - (mem >> 3); |
|
zone->used_mem = 0; |
|
zone->glob = glob; |
|
glob->zone_dma32 = zone; |
|
ret = kobject_init_and_add( |
|
&zone->kobj, &ttm_mem_zone_kobj_type, &glob->kobj, zone->name); |
|
if (unlikely(ret != 0)) { |
|
kobject_put(&zone->kobj); |
|
return ret; |
|
} |
|
glob->zones[glob->num_zones++] = zone; |
|
return 0; |
|
} |
|
#endif |
|
|
|
int ttm_mem_global_init(struct ttm_mem_global *glob) |
|
{ |
|
struct sysinfo si; |
|
int ret; |
|
int i; |
|
struct ttm_mem_zone *zone; |
|
|
|
spin_lock_init(&glob->lock); |
|
glob->swap_queue = create_singlethread_workqueue("ttm_swap"); |
|
INIT_WORK(&glob->work, ttm_shrink_work); |
|
ret = kobject_init_and_add( |
|
&glob->kobj, &ttm_mem_glob_kobj_type, ttm_get_kobj(), "memory_accounting"); |
|
if (unlikely(ret != 0)) { |
|
kobject_put(&glob->kobj); |
|
return ret; |
|
} |
|
|
|
si_meminfo(&si); |
|
|
|
/* set it as 0 by default to keep original behavior of OOM */ |
|
glob->lower_mem_limit = 0; |
|
|
|
ret = ttm_mem_init_kernel_zone(glob, &si); |
|
if (unlikely(ret != 0)) |
|
goto out_no_zone; |
|
#ifdef CONFIG_HIGHMEM |
|
ret = ttm_mem_init_highmem_zone(glob, &si); |
|
if (unlikely(ret != 0)) |
|
goto out_no_zone; |
|
#else |
|
ret = ttm_mem_init_dma32_zone(glob, &si); |
|
if (unlikely(ret != 0)) |
|
goto out_no_zone; |
|
#endif |
|
for (i = 0; i < glob->num_zones; ++i) { |
|
zone = glob->zones[i]; |
|
pr_info("Zone %7s: Available graphics memory: %llu KiB\n", |
|
zone->name, (unsigned long long)zone->max_mem >> 10); |
|
} |
|
ttm_page_alloc_init(glob, glob->zone_kernel->max_mem/(2*PAGE_SIZE)); |
|
ttm_dma_page_alloc_init(glob, glob->zone_kernel->max_mem/(2*PAGE_SIZE)); |
|
return 0; |
|
out_no_zone: |
|
ttm_mem_global_release(glob); |
|
return ret; |
|
} |
|
|
|
void ttm_mem_global_release(struct ttm_mem_global *glob) |
|
{ |
|
struct ttm_mem_zone *zone; |
|
unsigned int i; |
|
|
|
/* let the page allocator first stop the shrink work. */ |
|
ttm_page_alloc_fini(); |
|
ttm_dma_page_alloc_fini(); |
|
|
|
flush_workqueue(glob->swap_queue); |
|
destroy_workqueue(glob->swap_queue); |
|
glob->swap_queue = NULL; |
|
for (i = 0; i < glob->num_zones; ++i) { |
|
zone = glob->zones[i]; |
|
kobject_del(&zone->kobj); |
|
kobject_put(&zone->kobj); |
|
} |
|
kobject_del(&glob->kobj); |
|
kobject_put(&glob->kobj); |
|
memset(glob, 0, sizeof(*glob)); |
|
} |
|
|
|
static void ttm_check_swapping(struct ttm_mem_global *glob) |
|
{ |
|
bool needs_swapping = false; |
|
unsigned int i; |
|
struct ttm_mem_zone *zone; |
|
|
|
spin_lock(&glob->lock); |
|
for (i = 0; i < glob->num_zones; ++i) { |
|
zone = glob->zones[i]; |
|
if (zone->used_mem > zone->swap_limit) { |
|
needs_swapping = true; |
|
break; |
|
} |
|
} |
|
|
|
spin_unlock(&glob->lock); |
|
|
|
if (unlikely(needs_swapping)) |
|
(void)queue_work(glob->swap_queue, &glob->work); |
|
|
|
} |
|
|
|
static void ttm_mem_global_free_zone(struct ttm_mem_global *glob, |
|
struct ttm_mem_zone *single_zone, |
|
uint64_t amount) |
|
{ |
|
unsigned int i; |
|
struct ttm_mem_zone *zone; |
|
|
|
spin_lock(&glob->lock); |
|
for (i = 0; i < glob->num_zones; ++i) { |
|
zone = glob->zones[i]; |
|
if (single_zone && zone != single_zone) |
|
continue; |
|
zone->used_mem -= amount; |
|
} |
|
spin_unlock(&glob->lock); |
|
} |
|
|
|
void ttm_mem_global_free(struct ttm_mem_global *glob, |
|
uint64_t amount) |
|
{ |
|
return ttm_mem_global_free_zone(glob, glob->zone_kernel, amount); |
|
} |
|
EXPORT_SYMBOL(ttm_mem_global_free); |
|
|
|
/* |
|
* check if the available mem is under lower memory limit |
|
* |
|
* a. if no swap disk at all or free swap space is under swap_mem_limit |
|
* but available system mem is bigger than sys_mem_limit, allow TTM |
|
* allocation; |
|
* |
|
* b. if the available system mem is less than sys_mem_limit but free |
|
* swap disk is bigger than swap_mem_limit, allow TTM allocation. |
|
*/ |
|
bool |
|
ttm_check_under_lowerlimit(struct ttm_mem_global *glob, |
|
uint64_t num_pages, |
|
struct ttm_operation_ctx *ctx) |
|
{ |
|
int64_t available; |
|
|
|
if (ctx->flags & TTM_OPT_FLAG_FORCE_ALLOC) |
|
return false; |
|
|
|
available = get_nr_swap_pages() + si_mem_available(); |
|
available -= num_pages; |
|
if (available < glob->lower_mem_limit) |
|
return true; |
|
|
|
return false; |
|
} |
|
|
|
static int ttm_mem_global_reserve(struct ttm_mem_global *glob, |
|
struct ttm_mem_zone *single_zone, |
|
uint64_t amount, bool reserve) |
|
{ |
|
uint64_t limit; |
|
int ret = -ENOMEM; |
|
unsigned int i; |
|
struct ttm_mem_zone *zone; |
|
|
|
spin_lock(&glob->lock); |
|
for (i = 0; i < glob->num_zones; ++i) { |
|
zone = glob->zones[i]; |
|
if (single_zone && zone != single_zone) |
|
continue; |
|
|
|
limit = (capable(CAP_SYS_ADMIN)) ? |
|
zone->emer_mem : zone->max_mem; |
|
|
|
if (zone->used_mem > limit) |
|
goto out_unlock; |
|
} |
|
|
|
if (reserve) { |
|
for (i = 0; i < glob->num_zones; ++i) { |
|
zone = glob->zones[i]; |
|
if (single_zone && zone != single_zone) |
|
continue; |
|
zone->used_mem += amount; |
|
} |
|
} |
|
|
|
ret = 0; |
|
out_unlock: |
|
spin_unlock(&glob->lock); |
|
ttm_check_swapping(glob); |
|
|
|
return ret; |
|
} |
|
|
|
|
|
static int ttm_mem_global_alloc_zone(struct ttm_mem_global *glob, |
|
struct ttm_mem_zone *single_zone, |
|
uint64_t memory, |
|
struct ttm_operation_ctx *ctx) |
|
{ |
|
int count = TTM_MEMORY_ALLOC_RETRIES; |
|
|
|
while (unlikely(ttm_mem_global_reserve(glob, |
|
single_zone, |
|
memory, true) |
|
!= 0)) { |
|
if (ctx->no_wait_gpu) |
|
return -ENOMEM; |
|
if (unlikely(count-- == 0)) |
|
return -ENOMEM; |
|
ttm_shrink(glob, false, memory + (memory >> 2) + 16, ctx); |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
int ttm_mem_global_alloc(struct ttm_mem_global *glob, uint64_t memory, |
|
struct ttm_operation_ctx *ctx) |
|
{ |
|
/** |
|
* Normal allocations of kernel memory are registered in |
|
* the kernel zone. |
|
*/ |
|
|
|
return ttm_mem_global_alloc_zone(glob, glob->zone_kernel, memory, ctx); |
|
} |
|
EXPORT_SYMBOL(ttm_mem_global_alloc); |
|
|
|
int ttm_mem_global_alloc_page(struct ttm_mem_global *glob, |
|
struct page *page, uint64_t size, |
|
struct ttm_operation_ctx *ctx) |
|
{ |
|
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, size, ctx); |
|
} |
|
|
|
void ttm_mem_global_free_page(struct ttm_mem_global *glob, struct page *page, |
|
uint64_t size) |
|
{ |
|
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, 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);
|
|
|