0,0 → 1,605 |
/************************************************************************** |
* |
* 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> |
|
struct sysinfo { |
u32_t totalram; /* Total usable main memory size */ |
u32_t freeram; /* Available memory size */ |
u32_t sharedram; /* Amount of shared memory */ |
u32_t bufferram; /* Memory used by buffers */ |
u32_t totalswap; /* Total swap space size */ |
u32_t freeswap; /* swap space still available */ |
u32_t totalhigh; /* Total high memory size */ |
u32_t freehigh; /* Available high memory size */ |
u32_t mem_unit; /* Memory unit size in bytes */ |
}; |
|
|
#define TTM_MEMORY_ALLOC_RETRIES 4 |
|
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; |
}; |
|
#if 0 |
|
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 |
}; |
#endif |
|
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); |
} |
|
#if 0 |
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; |
} |
#endif |
|
//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 void ttm_mem_global_kobj_release(struct kobject *kobj) |
{ |
struct ttm_mem_global *glob = |
container_of(kobj, struct ttm_mem_global, kobj); |
|
kfree(glob); |
} |
|
static struct kobj_type ttm_mem_glob_kobj_type = { |
.release = &ttm_mem_global_kobj_release, |
}; |
|
#if 0 |
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) |
{ |
int ret; |
struct ttm_mem_shrink *shrink; |
|
spin_lock(&glob->lock); |
if (glob->shrink == NULL) |
goto out; |
|
while (ttm_zones_above_swap_target(glob, from_wq, extra)) { |
shrink = glob->shrink; |
spin_unlock(&glob->lock); |
ret = shrink->do_shrink(shrink); |
spin_lock(&glob->lock); |
if (unlikely(ret != 0)) |
goto out; |
} |
out: |
spin_unlock(&glob->lock); |
} |
|
|
|
static void ttm_shrink_work(struct work_struct *work) |
{ |
struct ttm_mem_global *glob = |
container_of(work, struct ttm_mem_global, work); |
|
ttm_shrink(glob, true, 0ULL); |
} |
#endif |
|
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; |
} |
|
#if 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, 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 |
|
|
|
void ttm_mem_global_release(struct ttm_mem_global *glob) |
{ |
unsigned int i; |
struct ttm_mem_zone *zone; |
|
/* 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); |
} |
EXPORT_SYMBOL(ttm_mem_global_release); |
|
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, NULL, amount); |
} |
EXPORT_SYMBOL(ttm_mem_global_free); |
|
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 = zone->emer_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, |
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); |
} |
|
#endif |
|
void ttm_mem_global_free_page(struct ttm_mem_global *glob, struct page *page) |
{ |
|
} |
|
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); |
|
void ttm_mem_global_free(struct ttm_mem_global *glob, |
uint64_t amount) |
{ |
return 0; |
} |
|
|
int ttm_mem_global_alloc(struct ttm_mem_global *glob, uint64_t memory, |
bool no_wait, bool interruptible) |
{ |
return 0; |
} |
|
EXPORT_SYMBOL(ttm_mem_global_alloc); |
|
int ttm_mem_global_init(struct ttm_mem_global *glob) |
{ |
return 0; |
} |
EXPORT_SYMBOL(ttm_mem_global_init); |