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Merge branch 'drm-ttm-pool' into drm-core-next

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* drm-ttm-pool:
  drm/ttm: using kmalloc/kfree requires including slab.h
  drm/ttm: include linux/seq_file.h for seq_printf
  drm/ttm: Add sysfs interface to control pool allocator.
  drm/ttm: Use set_pages_array_wc instead of set_memory_wc.
  arch/x86: Add array variants for setting memory to wc caching.
  drm/nouveau: Add ttm page pool debugfs file.
  drm/radeon/kms: Add ttm page pool debugfs file.
  drm/ttm: Add debugfs output entry to pool allocator.
  drm/ttm: add pool wc/uc page allocator V3
This commit is contained in:
Dave Airlie 2010-04-20 13:12:28 +10:00
commit c2b41276da
9 changed files with 1007 additions and 36 deletions
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2
arch/x86/include/asm/cacheflush.h
View File

@ -139,9 +139,11 @@ int set_memory_np(unsigned long addr, int numpages);
int set_memory_4k(unsigned long addr, int numpages);
int set_memory_array_uc(unsigned long *addr, int addrinarray);
int set_memory_array_wc(unsigned long *addr, int addrinarray);
int set_memory_array_wb(unsigned long *addr, int addrinarray);
int set_pages_array_uc(struct page **pages, int addrinarray);
int set_pages_array_wc(struct page **pages, int addrinarray);
int set_pages_array_wb(struct page **pages, int addrinarray);
/*

53
arch/x86/mm/pageattr.c
View File

@ -997,7 +997,8 @@ out_err:
}
EXPORT_SYMBOL(set_memory_uc);
int set_memory_array_uc(unsigned long *addr, int addrinarray)
int _set_memory_array(unsigned long *addr, int addrinarray,
unsigned long new_type)
{
int i, j;
int ret;
@ -1007,13 +1008,19 @@ int set_memory_array_uc(unsigned long *addr, int addrinarray)
*/
for (i = 0; i < addrinarray; i++) {
ret = reserve_memtype(__pa(addr[i]), __pa(addr[i]) + PAGE_SIZE,
_PAGE_CACHE_UC_MINUS, NULL);
new_type, NULL);
if (ret)
goto out_free;
}
ret = change_page_attr_set(addr, addrinarray,
__pgprot(_PAGE_CACHE_UC_MINUS), 1);
if (!ret && new_type == _PAGE_CACHE_WC)
ret = change_page_attr_set_clr(addr, addrinarray,
__pgprot(_PAGE_CACHE_WC),
__pgprot(_PAGE_CACHE_MASK),
0, CPA_ARRAY, NULL);
if (ret)
goto out_free;
@ -1025,8 +1032,19 @@ out_free:
return ret;
}
int set_memory_array_uc(unsigned long *addr, int addrinarray)
{
return _set_memory_array(addr, addrinarray, _PAGE_CACHE_UC_MINUS);
}
EXPORT_SYMBOL(set_memory_array_uc);
int set_memory_array_wc(unsigned long *addr, int addrinarray)
{
return _set_memory_array(addr, addrinarray, _PAGE_CACHE_WC);
}
EXPORT_SYMBOL(set_memory_array_wc);
int _set_memory_wc(unsigned long addr, int numpages)
{
int ret;
@ -1153,26 +1171,34 @@ int set_pages_uc(struct page *page, int numpages)
}
EXPORT_SYMBOL(set_pages_uc);
int set_pages_array_uc(struct page **pages, int addrinarray)
static int _set_pages_array(struct page **pages, int addrinarray,
unsigned long new_type)
{
unsigned long start;
unsigned long end;
int i;
int free_idx;
int ret;
for (i = 0; i < addrinarray; i++) {
if (PageHighMem(pages[i]))
continue;
start = page_to_pfn(pages[i]) << PAGE_SHIFT;
end = start + PAGE_SIZE;
if (reserve_memtype(start, end, _PAGE_CACHE_UC_MINUS, NULL))
if (reserve_memtype(start, end, new_type, NULL))
goto err_out;
}
if (cpa_set_pages_array(pages, addrinarray,
__pgprot(_PAGE_CACHE_UC_MINUS)) == 0) {
return 0; /* Success */
}
ret = cpa_set_pages_array(pages, addrinarray,
__pgprot(_PAGE_CACHE_UC_MINUS));
if (!ret && new_type == _PAGE_CACHE_WC)
ret = change_page_attr_set_clr(NULL, addrinarray,
__pgprot(_PAGE_CACHE_WC),
__pgprot(_PAGE_CACHE_MASK),
0, CPA_PAGES_ARRAY, pages);
if (ret)
goto err_out;
return 0; /* Success */
err_out:
free_idx = i;
for (i = 0; i < free_idx; i++) {
@ -1184,8 +1210,19 @@ err_out:
}
return -EINVAL;
}
int set_pages_array_uc(struct page **pages, int addrinarray)
{
return _set_pages_array(pages, addrinarray, _PAGE_CACHE_UC_MINUS);
}
EXPORT_SYMBOL(set_pages_array_uc);
int set_pages_array_wc(struct page **pages, int addrinarray)
{
return _set_pages_array(pages, addrinarray, _PAGE_CACHE_WC);
}
EXPORT_SYMBOL(set_pages_array_wc);
int set_pages_wb(struct page *page, int numpages)
{
unsigned long addr = (unsigned long)page_address(page);

3
drivers/gpu/drm/nouveau/nouveau_debugfs.c
View File

@ -33,6 +33,8 @@
#include "drmP.h"
#include "nouveau_drv.h"
#include <ttm/ttm_page_alloc.h>
static int
nouveau_debugfs_channel_info(struct seq_file *m, void *data)
{
@ -159,6 +161,7 @@ static struct drm_info_list nouveau_debugfs_list[] = {
{ "chipset", nouveau_debugfs_chipset_info, 0, NULL },
{ "memory", nouveau_debugfs_memory_info, 0, NULL },
{ "vbios.rom", nouveau_debugfs_vbios_image, 0, NULL },
{ "ttm_page_pool", ttm_page_alloc_debugfs, 0, NULL },
};
#define NOUVEAU_DEBUGFS_ENTRIES ARRAY_SIZE(nouveau_debugfs_list)

13
drivers/gpu/drm/radeon/radeon_ttm.c
View File

@ -33,6 +33,7 @@
#include <ttm/ttm_bo_driver.h>
#include <ttm/ttm_placement.h>
#include <ttm/ttm_module.h>
#include <ttm/ttm_page_alloc.h>
#include <drm/drmP.h>
#include <drm/radeon_drm.h>
#include <linux/seq_file.h>
@ -745,8 +746,8 @@ static int radeon_mm_dump_table(struct seq_file *m, void *data)
static int radeon_ttm_debugfs_init(struct radeon_device *rdev)
{
#if defined(CONFIG_DEBUG_FS)
static struct drm_info_list radeon_mem_types_list[RADEON_DEBUGFS_MEM_TYPES];
static char radeon_mem_types_names[RADEON_DEBUGFS_MEM_TYPES][32];
static struct drm_info_list radeon_mem_types_list[RADEON_DEBUGFS_MEM_TYPES+1];
static char radeon_mem_types_names[RADEON_DEBUGFS_MEM_TYPES+1][32];
unsigned i;
for (i = 0; i < RADEON_DEBUGFS_MEM_TYPES; i++) {
@ -763,7 +764,13 @@ static int radeon_ttm_debugfs_init(struct radeon_device *rdev)
radeon_mem_types_list[i].data = &rdev->mman.bdev.man[TTM_PL_TT].manager;
}
return radeon_debugfs_add_files(rdev, radeon_mem_types_list, RADEON_DEBUGFS_MEM_TYPES);
/* Add ttm page pool to debugfs */
sprintf(radeon_mem_types_names[i], "ttm_page_pool");
radeon_mem_types_list[i].name = radeon_mem_types_names[i];
radeon_mem_types_list[i].show = &ttm_page_alloc_debugfs;
radeon_mem_types_list[i].driver_features = 0;
radeon_mem_types_list[i].data = NULL;
return radeon_debugfs_add_files(rdev, radeon_mem_types_list, RADEON_DEBUGFS_MEM_TYPES+1);
#endif
return 0;

2
drivers/gpu/drm/ttm/Makefile
View File

@ -4,6 +4,6 @@
ccflags-y := -Iinclude/drm
ttm-y := ttm_agp_backend.o ttm_memory.o ttm_tt.o ttm_bo.o \
ttm_bo_util.o ttm_bo_vm.o ttm_module.o ttm_global.o \
ttm_object.o ttm_lock.o ttm_execbuf_util.o
ttm_object.o ttm_lock.o ttm_execbuf_util.o ttm_page_alloc.o
obj-$(CONFIG_DRM_TTM) += ttm.o

7
drivers/gpu/drm/ttm/ttm_memory.c
View File

@ -27,6 +27,7 @@
#include "ttm/ttm_memory.h"
#include "ttm/ttm_module.h"
#include "ttm/ttm_page_alloc.h"
#include <linux/spinlock.h>
#include <linux/sched.h>
#include <linux/wait.h>
@ -393,6 +394,7 @@ int ttm_mem_global_init(struct ttm_mem_global *glob)
"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));
return 0;
out_no_zone:
ttm_mem_global_release(glob);
@ -405,6 +407,9 @@ 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();
flush_workqueue(glob->swap_queue);
destroy_workqueue(glob->swap_queue);
glob->swap_queue = NULL;
@ -412,7 +417,7 @@ void ttm_mem_global_release(struct ttm_mem_global *glob)
zone = glob->zones[i];
kobject_del(&zone->kobj);
kobject_put(&zone->kobj);
}
}
kobject_del(&glob->kobj);
kobject_put(&glob->kobj);
}

845
drivers/gpu/drm/ttm/ttm_page_alloc.c Normal file
View File

@ -0,0 +1,845 @@
/*
* Copyright (c) Red Hat Inc.
* 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 AUTHORS OR COPYRIGHT HOLDERS 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: Dave Airlie <airlied@redhat.com>
* Jerome Glisse <jglisse@redhat.com>
* Pauli Nieminen <suokkos@gmail.com>
*/
/* simple list based uncached page pool
* - Pool collects resently freed pages for reuse
* - Use page->lru to keep a free list
* - doesn't track currently in use pages
*/
#include <linux/list.h>
#include <linux/spinlock.h>
#include <linux/highmem.h>
#include <linux/mm_types.h>
#include <linux/module.h>
#include <linux/mm.h>
#include <linux/seq_file.h> /* for seq_printf */
#include <linux/slab.h>
#include <asm/atomic.h>
#include <asm/agp.h>
#include "ttm/ttm_bo_driver.h"
#include "ttm/ttm_page_alloc.h"
#define NUM_PAGES_TO_ALLOC (PAGE_SIZE/sizeof(struct page *))
#define SMALL_ALLOCATION 16
#define FREE_ALL_PAGES (~0U)
/* times are in msecs */
#define PAGE_FREE_INTERVAL 1000
/**
* struct ttm_page_pool - Pool to reuse recently allocated uc/wc pages.
*
* @lock: Protects the shared pool from concurrnet access. Must be used with
* irqsave/irqrestore variants because pool allocator maybe called from
* delayed work.
* @fill_lock: Prevent concurrent calls to fill.
* @list: Pool of free uc/wc pages for fast reuse.
* @gfp_flags: Flags to pass for alloc_page.
* @npages: Number of pages in pool.
*/
struct ttm_page_pool {
spinlock_t lock;
bool fill_lock;
struct list_head list;
int gfp_flags;
unsigned npages;
char *name;
unsigned long nfrees;
unsigned long nrefills;
};
/**
* Limits for the pool. They are handled without locks because only place where
* they may change is in sysfs store. They won't have immediate effect anyway
* so forcing serialiazation to access them is pointless.
*/
struct ttm_pool_opts {
unsigned alloc_size;
unsigned max_size;
unsigned small;
};
#define NUM_POOLS 4
/**
* struct ttm_pool_manager - Holds memory pools for fst allocation
*
* Manager is read only object for pool code so it doesn't need locking.
*
* @free_interval: minimum number of jiffies between freeing pages from pool.
* @page_alloc_inited: reference counting for pool allocation.
* @work: Work that is used to shrink the pool. Work is only run when there is
* some pages to free.
* @small_allocation: Limit in number of pages what is small allocation.
*
* @pools: All pool objects in use.
**/
struct ttm_pool_manager {
struct kobject kobj;
struct shrinker mm_shrink;
atomic_t page_alloc_inited;
struct ttm_pool_opts options;
union {
struct ttm_page_pool pools[NUM_POOLS];
struct {
struct ttm_page_pool wc_pool;
struct ttm_page_pool uc_pool;
struct ttm_page_pool wc_pool_dma32;
struct ttm_page_pool uc_pool_dma32;
} ;
};
};
static struct attribute ttm_page_pool_max = {
.name = "pool_max_size",
.mode = S_IRUGO | S_IWUSR
};
static struct attribute ttm_page_pool_small = {
.name = "pool_small_allocation",
.mode = S_IRUGO | S_IWUSR
};
static struct attribute ttm_page_pool_alloc_size = {
.name = "pool_allocation_size",
.mode = S_IRUGO | S_IWUSR
};
static struct attribute *ttm_pool_attrs[] = {
&ttm_page_pool_max,
&ttm_page_pool_small,
&ttm_page_pool_alloc_size,
NULL
};
static void ttm_pool_kobj_release(struct kobject *kobj)
{
struct ttm_pool_manager *m =
container_of(kobj, struct ttm_pool_manager, kobj);
(void)m;
}
static ssize_t ttm_pool_store(struct kobject *kobj,
struct attribute *attr, const char *buffer, size_t size)
{
struct ttm_pool_manager *m =
container_of(kobj, struct ttm_pool_manager, kobj);
int chars;
unsigned val;
chars = sscanf(buffer, "%u", &val);
if (chars == 0)
return size;
/* Convert kb to number of pages */
val = val / (PAGE_SIZE >> 10);
if (attr == &ttm_page_pool_max)
m->options.max_size = val;
else if (attr == &ttm_page_pool_small)
m->options.small = val;
else if (attr == &ttm_page_pool_alloc_size) {
if (val > NUM_PAGES_TO_ALLOC*8) {
printk(KERN_ERR "[ttm] Setting allocation size to %lu "
"is not allowed. Recomended size is "
"%lu\n",
NUM_PAGES_TO_ALLOC*(PAGE_SIZE >> 7),
NUM_PAGES_TO_ALLOC*(PAGE_SIZE >> 10));
return size;
} else if (val > NUM_PAGES_TO_ALLOC) {
printk(KERN_WARNING "[ttm] Setting allocation size to "
"larger than %lu is not recomended.\n",
NUM_PAGES_TO_ALLOC*(PAGE_SIZE >> 10));
}
m->options.alloc_size = val;
}
return size;
}
static ssize_t ttm_pool_show(struct kobject *kobj,
struct attribute *attr, char *buffer)
{
struct ttm_pool_manager *m =
container_of(kobj, struct ttm_pool_manager, kobj);
unsigned val = 0;
if (attr == &ttm_page_pool_max)
val = m->options.max_size;
else if (attr == &ttm_page_pool_small)
val = m->options.small;
else if (attr == &ttm_page_pool_alloc_size)
val = m->options.alloc_size;
val = val * (PAGE_SIZE >> 10);
return snprintf(buffer, PAGE_SIZE, "%u\n", val);
}
static const struct sysfs_ops ttm_pool_sysfs_ops = {
.show = &ttm_pool_show,
.store = &ttm_pool_store,
};
static struct kobj_type ttm_pool_kobj_type = {
.release = &ttm_pool_kobj_release,
.sysfs_ops = &ttm_pool_sysfs_ops,
.default_attrs = ttm_pool_attrs,
};
static struct ttm_pool_manager _manager = {
.page_alloc_inited = ATOMIC_INIT(0)
};
#ifndef CONFIG_X86
static int set_pages_array_wb(struct page **pages, int addrinarray)
{
#ifdef TTM_HAS_AGP
int i;
for (i = 0; i < addrinarray; i++)
unmap_page_from_agp(pages[i]);
#endif
return 0;
}
static int set_pages_array_wc(struct page **pages, int addrinarray)
{
#ifdef TTM_HAS_AGP
int i;
for (i = 0; i < addrinarray; i++)
map_page_into_agp(pages[i]);
#endif
return 0;
}
static int set_pages_array_uc(struct page **pages, int addrinarray)
{
#ifdef TTM_HAS_AGP
int i;
for (i = 0; i < addrinarray; i++)
map_page_into_agp(pages[i]);
#endif
return 0;
}
#endif
/**
* Select the right pool or requested caching state and ttm flags. */
static struct ttm_page_pool *ttm_get_pool(int flags,
enum ttm_caching_state cstate)
{
int pool_index;
if (cstate == tt_cached)
return NULL;
if (cstate == tt_wc)
pool_index = 0x0;
else
pool_index = 0x1;
if (flags & TTM_PAGE_FLAG_DMA32)
pool_index |= 0x2;
return &_manager.pools[pool_index];
}
/* set memory back to wb and free the pages. */
static void ttm_pages_put(struct page *pages[], unsigned npages)
{
unsigned i;
if (set_pages_array_wb(pages, npages))
printk(KERN_ERR "[ttm] Failed to set %d pages to wb!\n",
npages);
for (i = 0; i < npages; ++i)
__free_page(pages[i]);
}
static void ttm_pool_update_free_locked(struct ttm_page_pool *pool,
unsigned freed_pages)
{
pool->npages -= freed_pages;
pool->nfrees += freed_pages;
}
/**
* Free pages from pool.
*
* To prevent hogging the ttm_swap process we only free NUM_PAGES_TO_ALLOC
* number of pages in one go.
*
* @pool: to free the pages from
* @free_all: If set to true will free all pages in pool
**/
static int ttm_page_pool_free(struct ttm_page_pool *pool, unsigned nr_free)
{
unsigned long irq_flags;
struct page *p;
struct page **pages_to_free;
unsigned freed_pages = 0,
npages_to_free = nr_free;
if (NUM_PAGES_TO_ALLOC < nr_free)
npages_to_free = NUM_PAGES_TO_ALLOC;
pages_to_free = kmalloc(npages_to_free * sizeof(struct page *),
GFP_KERNEL);
if (!pages_to_free) {
printk(KERN_ERR "Failed to allocate memory for pool free operation.\n");
return 0;
}
restart:
spin_lock_irqsave(&pool->lock, irq_flags);
list_for_each_entry_reverse(p, &pool->list, lru) {
if (freed_pages >= npages_to_free)
break;
pages_to_free[freed_pages++] = p;
/* We can only remove NUM_PAGES_TO_ALLOC at a time. */
if (freed_pages >= NUM_PAGES_TO_ALLOC) {
/* remove range of pages from the pool */
__list_del(p->lru.prev, &pool->list);
ttm_pool_update_free_locked(pool, freed_pages);
/**
* Because changing page caching is costly
* we unlock the pool to prevent stalling.
*/
spin_unlock_irqrestore(&pool->lock, irq_flags);
ttm_pages_put(pages_to_free, freed_pages);
if (likely(nr_free != FREE_ALL_PAGES))
nr_free -= freed_pages;
if (NUM_PAGES_TO_ALLOC >= nr_free)
npages_to_free = nr_free;
else
npages_to_free = NUM_PAGES_TO_ALLOC;
freed_pages = 0;
/* free all so restart the processing */
if (nr_free)
goto restart;
/* Not allowed to fall tough or break because
* following context is inside spinlock while we are
* outside here.
*/
goto out;
}
}
/* remove range of pages from the pool */
if (freed_pages) {
__list_del(&p->lru, &pool->list);
ttm_pool_update_free_locked(pool, freed_pages);
nr_free -= freed_pages;
}
spin_unlock_irqrestore(&pool->lock, irq_flags);
if (freed_pages)
ttm_pages_put(pages_to_free, freed_pages);
out:
kfree(pages_to_free);
return nr_free;
}
/* Get good estimation how many pages are free in pools */
static int ttm_pool_get_num_unused_pages(void)
{
unsigned i;
int total = 0;
for (i = 0; i < NUM_POOLS; ++i)
total += _manager.pools[i].npages;
return total;
}
/**
* Calback for mm to request pool to reduce number of page held.
*/
static int ttm_pool_mm_shrink(int shrink_pages, gfp_t gfp_mask)
{
static atomic_t start_pool = ATOMIC_INIT(0);
unsigned i;
unsigned pool_offset = atomic_add_return(1, &start_pool);
struct ttm_page_pool *pool;
pool_offset = pool_offset % NUM_POOLS;
/* select start pool in round robin fashion */
for (i = 0; i < NUM_POOLS; ++i) {
unsigned nr_free = shrink_pages;
if (shrink_pages == 0)
break;
pool = &_manager.pools[(i + pool_offset)%NUM_POOLS];
shrink_pages = ttm_page_pool_free(pool, nr_free);
}
/* return estimated number of unused pages in pool */
return ttm_pool_get_num_unused_pages();
}
static void ttm_pool_mm_shrink_init(struct ttm_pool_manager *manager)
{
manager->mm_shrink.shrink = &ttm_pool_mm_shrink;
manager->mm_shrink.seeks = 1;
register_shrinker(&manager->mm_shrink);
}
static void ttm_pool_mm_shrink_fini(struct ttm_pool_manager *manager)
{
unregister_shrinker(&manager->mm_shrink);
}
static int ttm_set_pages_caching(struct page **pages,
enum ttm_caching_state cstate, unsigned cpages)
{
int r = 0;
/* Set page caching */
switch (cstate) {
case tt_uncached:
r = set_pages_array_uc(pages, cpages);
if (r)
printk(KERN_ERR "[ttm] Failed to set %d pages to uc!\n",
cpages);
break;
case tt_wc:
r = set_pages_array_wc(pages, cpages);
if (r)
printk(KERN_ERR "[ttm] Failed to set %d pages to wc!\n",
cpages);
break;
default:
break;
}
return r;
}
/**
* Free pages the pages that failed to change the caching state. If there is
* any pages that have changed their caching state already put them to the
* pool.
*/
static void ttm_handle_caching_state_failure(struct list_head *pages,
int ttm_flags, enum ttm_caching_state cstate,
struct page **failed_pages, unsigned cpages)
{
unsigned i;
/* Failed pages has to be reed */
for (i = 0; i < cpages; ++i) {
list_del(&failed_pages[i]->lru);
__free_page(failed_pages[i]);
}
}
/**
* Allocate new pages with correct caching.
*
* This function is reentrant if caller updates count depending on number of
* pages returned in pages array.
*/
static int ttm_alloc_new_pages(struct list_head *pages, int gfp_flags,
int ttm_flags, enum ttm_caching_state cstate, unsigned count)
{
struct page **caching_array;
struct page *p;
int r = 0;
unsigned i, cpages;
unsigned max_cpages = min(count,
(unsigned)(PAGE_SIZE/sizeof(struct page *)));
/* allocate array for page caching change */
caching_array = kmalloc(max_cpages*sizeof(struct page *), GFP_KERNEL);
if (!caching_array) {
printk(KERN_ERR "[ttm] unable to allocate table for new pages.");
return -ENOMEM;
}
for (i = 0, cpages = 0; i < count; ++i) {
p = alloc_page(gfp_flags);
if (!p) {
printk(KERN_ERR "[ttm] unable to get page %u\n", i);
/* store already allocated pages in the pool after
* setting the caching state */
if (cpages) {
r = ttm_set_pages_caching(caching_array, cstate, cpages);
if (r)
ttm_handle_caching_state_failure(pages,
ttm_flags, cstate,
caching_array, cpages);
}
r = -ENOMEM;
goto out;
}
#ifdef CONFIG_HIGHMEM
/* gfp flags of highmem page should never be dma32 so we
* we should be fine in such case
*/
if (!PageHighMem(p))
#endif
{
caching_array[cpages++] = p;
if (cpages == max_cpages) {
r = ttm_set_pages_caching(caching_array,
cstate, cpages);
if (r) {
ttm_handle_caching_state_failure(pages,
ttm_flags, cstate,
caching_array, cpages);
goto out;
}
cpages = 0;
}
}
list_add(&p->lru, pages);
}
if (cpages) {
r = ttm_set_pages_caching(caching_array, cstate, cpages);
if (r)
ttm_handle_caching_state_failure(pages,
ttm_flags, cstate,
caching_array, cpages);
}
out:
kfree(caching_array);
return r;
}
/**
* Fill the given pool if there isn't enough pages and requested number of
* pages is small.
*/
static void ttm_page_pool_fill_locked(struct ttm_page_pool *pool,
int ttm_flags, enum ttm_caching_state cstate, unsigned count,
unsigned long *irq_flags)
{
struct page *p;
int r;
unsigned cpages = 0;
/**
* Only allow one pool fill operation at a time.
* If pool doesn't have enough pages for the allocation new pages are
* allocated from outside of pool.
*/
if (pool->fill_lock)
return;
pool->fill_lock = true;
/* If allocation request is small and there is not enough
* pages in pool we fill the pool first */
if (count < _manager.options.small
&& count > pool->npages) {
struct list_head new_pages;
unsigned alloc_size = _manager.options.alloc_size;
/**
* Can't change page caching if in irqsave context. We have to
* drop the pool->lock.
*/
spin_unlock_irqrestore(&pool->lock, *irq_flags);
INIT_LIST_HEAD(&new_pages);
r = ttm_alloc_new_pages(&new_pages, pool->gfp_flags, ttm_flags,
cstate, alloc_size);
spin_lock_irqsave(&pool->lock, *irq_flags);
if (!r) {
list_splice(&new_pages, &pool->list);
++pool->nrefills;
pool->npages += alloc_size;
} else {
printk(KERN_ERR "[ttm] Failed to fill pool (%p).", pool);
/* If we have any pages left put them to the pool. */
list_for_each_entry(p, &pool->list, lru) {
++cpages;
}
list_splice(&new_pages, &pool->list);
pool->npages += cpages;
}
}
pool->fill_lock = false;
}
/**
* Cut count nubmer of pages from the pool and put them to return list
*
* @return count of pages still to allocate to fill the request.
*/
static unsigned ttm_page_pool_get_pages(struct ttm_page_pool *pool,
struct list_head *pages, int ttm_flags,
enum ttm_caching_state cstate, unsigned count)
{
unsigned long irq_flags;
struct list_head *p;
unsigned i;
spin_lock_irqsave(&pool->lock, irq_flags);
ttm_page_pool_fill_locked(pool, ttm_flags, cstate, count, &irq_flags);
if (count >= pool->npages) {
/* take all pages from the pool */
list_splice_init(&pool->list, pages);
count -= pool->npages;
pool->npages = 0;
goto out;
}
/* find the last pages to include for requested number of pages. Split
* pool to begin and halves to reduce search space. */
if (count <= pool->npages/2) {
i = 0;
list_for_each(p, &pool->list) {
if (++i == count)
break;
}
} else {
i = pool->npages + 1;
list_for_each_prev(p, &pool->list) {
if (--i == count)
break;
}
}
/* Cut count number of pages from pool */
list_cut_position(pages, &pool->list, p);
pool->npages -= count;
count = 0;
out:
spin_unlock_irqrestore(&pool->lock, irq_flags);
return count;
}
/*
* On success pages list will hold count number of correctly
* cached pages.
*/
int ttm_get_pages(struct list_head *pages, int flags,
enum ttm_caching_state cstate, unsigned count)
{
struct ttm_page_pool *pool = ttm_get_pool(flags, cstate);
struct page *p = NULL;
int gfp_flags = 0;
int r;
/* set zero flag for page allocation if required */
if (flags & TTM_PAGE_FLAG_ZERO_ALLOC)
gfp_flags |= __GFP_ZERO;
/* No pool for cached pages */
if (pool == NULL) {
if (flags & TTM_PAGE_FLAG_DMA32)
gfp_flags |= GFP_DMA32;
else
gfp_flags |= __GFP_HIGHMEM;
for (r = 0; r < count; ++r) {
p = alloc_page(gfp_flags);
if (!p) {
printk(KERN_ERR "[ttm] unable to allocate page.");
return -ENOMEM;
}
list_add(&p->lru, pages);
}
return 0;
}
/* combine zero flag to pool flags */
gfp_flags |= pool->gfp_flags;
/* First we take pages from the pool */
count = ttm_page_pool_get_pages(pool, pages, flags, cstate, count);
/* clear the pages coming from the pool if requested */
if (flags & TTM_PAGE_FLAG_ZERO_ALLOC) {
list_for_each_entry(p, pages, lru) {
clear_page(page_address(p));
}
}
/* If pool didn't have enough pages allocate new one. */
if (count > 0) {
/* ttm_alloc_new_pages doesn't reference pool so we can run
* multiple requests in parallel.
**/
r = ttm_alloc_new_pages(pages, gfp_flags, flags, cstate, count);
if (r) {
/* If there is any pages in the list put them back to
* the pool. */
printk(KERN_ERR "[ttm] Failed to allocate extra pages "
"for large request.");
ttm_put_pages(pages, 0, flags, cstate);
return r;
}
}
return 0;
}
/* Put all pages in pages list to correct pool to wait for reuse */
void ttm_put_pages(struct list_head *pages, unsigned page_count, int flags,
enum ttm_caching_state cstate)
{
unsigned long irq_flags;
struct ttm_page_pool *pool = ttm_get_pool(flags, cstate);
struct page *p, *tmp;
if (pool == NULL) {
/* No pool for this memory type so free the pages */
list_for_each_entry_safe(p, tmp, pages, lru) {
__free_page(p);
}
/* Make the pages list empty */
INIT_LIST_HEAD(pages);
return;
}
if (page_count == 0) {
list_for_each_entry_safe(p, tmp, pages, lru) {
++page_count;
}
}
spin_lock_irqsave(&pool->lock, irq_flags);
list_splice_init(pages, &pool->list);
pool->npages += page_count;
/* Check that we don't go over the pool limit */
page_count = 0;
if (pool->npages > _manager.options.max_size) {
page_count = pool->npages - _manager.options.max_size;
/* free at least NUM_PAGES_TO_ALLOC number of pages
* to reduce calls to set_memory_wb */
if (page_count < NUM_PAGES_TO_ALLOC)
page_count = NUM_PAGES_TO_ALLOC;
}
spin_unlock_irqrestore(&pool->lock, irq_flags);
if (page_count)
ttm_page_pool_free(pool, page_count);
}
static void ttm_page_pool_init_locked(struct ttm_page_pool *pool, int flags,
char *name)
{
spin_lock_init(&pool->lock);
pool->fill_lock = false;
INIT_LIST_HEAD(&pool->list);
pool->npages = pool->nfrees = 0;
pool->gfp_flags = flags;
pool->name = name;
}
int ttm_page_alloc_init(struct ttm_mem_global *glob, unsigned max_pages)
{
int ret;
if (atomic_add_return(1, &_manager.page_alloc_inited) > 1)
return 0;
printk(KERN_INFO "[ttm] Initializing pool allocator.\n");
ttm_page_pool_init_locked(&_manager.wc_pool, GFP_HIGHUSER, "wc");
ttm_page_pool_init_locked(&_manager.uc_pool, GFP_HIGHUSER, "uc");
ttm_page_pool_init_locked(&_manager.wc_pool_dma32, GFP_USER | GFP_DMA32,
"wc dma");
ttm_page_pool_init_locked(&_manager.uc_pool_dma32, GFP_USER | GFP_DMA32,
"uc dma");
_manager.options.max_size = max_pages;
_manager.options.small = SMALL_ALLOCATION;
_manager.options.alloc_size = NUM_PAGES_TO_ALLOC;
kobject_init(&_manager.kobj, &ttm_pool_kobj_type);
ret = kobject_add(&_manager.kobj, &glob->kobj, "pool");
if (unlikely(ret != 0)) {
kobject_put(&_manager.kobj);
return ret;
}
ttm_pool_mm_shrink_init(&_manager);
return 0;
}
void ttm_page_alloc_fini()
{
int i;
if (atomic_sub_return(1, &_manager.page_alloc_inited) > 0)
return;
printk(KERN_INFO "[ttm] Finilizing pool allocator.\n");
ttm_pool_mm_shrink_fini(&_manager);
for (i = 0; i < NUM_POOLS; ++i)
ttm_page_pool_free(&_manager.pools[i], FREE_ALL_PAGES);
kobject_put(&_manager.kobj);
}
int ttm_page_alloc_debugfs(struct seq_file *m, void *data)
{
struct ttm_page_pool *p;
unsigned i;
char *h[] = {"pool", "refills", "pages freed", "size"};
if (atomic_read(&_manager.page_alloc_inited) == 0) {
seq_printf(m, "No pool allocator running.\n");
return 0;
}
seq_printf(m, "%6s %12s %13s %8s\n",
h[0], h[1], h[2], h[3]);
for (i = 0; i < NUM_POOLS; ++i) {
p = &_manager.pools[i];
seq_printf(m, "%6s %12ld %13ld %8d\n",
p->name, p->nrefills,
p->nfrees, p->npages);
}
return 0;
}
EXPORT_SYMBOL(ttm_page_alloc_debugfs);

44
drivers/gpu/drm/ttm/ttm_tt.c
View File

@ -39,6 +39,7 @@
#include "ttm/ttm_module.h"
#include "ttm/ttm_bo_driver.h"
#include "ttm/ttm_placement.h"
#include "ttm/ttm_page_alloc.h"
static int ttm_tt_swapin(struct ttm_tt *ttm);
@ -56,21 +57,6 @@ static void ttm_tt_free_page_directory(struct ttm_tt *ttm)
ttm->pages = NULL;
}
static struct page *ttm_tt_alloc_page(unsigned page_flags)
{
gfp_t gfp_flags = GFP_USER;
if (page_flags & TTM_PAGE_FLAG_ZERO_ALLOC)
gfp_flags |= __GFP_ZERO;
if (page_flags & TTM_PAGE_FLAG_DMA32)
gfp_flags |= __GFP_DMA32;
else
gfp_flags |= __GFP_HIGHMEM;
return alloc_page(gfp_flags);
}
static void ttm_tt_free_user_pages(struct ttm_tt *ttm)
{
int write;
@ -111,15 +97,21 @@ static void ttm_tt_free_user_pages(struct ttm_tt *ttm)
static struct page *__ttm_tt_get_page(struct ttm_tt *ttm, int index)
{
struct page *p;
struct list_head h;
struct ttm_mem_global *mem_glob = ttm->glob->mem_glob;
int ret;
while (NULL == (p = ttm->pages[index])) {
p = ttm_tt_alloc_page(ttm->page_flags);
if (!p)
INIT_LIST_HEAD(&h);
ret = ttm_get_pages(&h, ttm->page_flags, ttm->caching_state, 1);
if (ret != 0)
return NULL;
p = list_first_entry(&h, struct page, lru);
ret = ttm_mem_global_alloc_page(mem_glob, p, false, false);
if (unlikely(ret != 0))
goto out_err;
@ -228,10 +220,10 @@ static int ttm_tt_set_caching(struct ttm_tt *ttm,
if (ttm->caching_state == c_state)
return 0;
if (c_state != tt_cached) {
ret = ttm_tt_populate(ttm);
if (unlikely(ret != 0))
return ret;
if (ttm->state == tt_unpopulated) {
/* Change caching but don't populate */
ttm->caching_state = c_state;
return 0;
}
if (ttm->caching_state == tt_cached)
@ -282,13 +274,17 @@ EXPORT_SYMBOL(ttm_tt_set_placement_caching);
static void ttm_tt_free_alloced_pages(struct ttm_tt *ttm)
{
int i;
unsigned count = 0;
struct list_head h;
struct page *cur_page;
struct ttm_backend *be = ttm->be;
INIT_LIST_HEAD(&h);
if (be)
be->func->clear(be);
(void)ttm_tt_set_caching(ttm, tt_cached);
for (i = 0; i < ttm->num_pages; ++i) {
cur_page = ttm->pages[i];
ttm->pages[i] = NULL;
if (cur_page) {
@ -298,9 +294,11 @@ static void ttm_tt_free_alloced_pages(struct ttm_tt *ttm)
"Leaking pages.\n");
ttm_mem_global_free_page(ttm->glob->mem_glob,
cur_page);
__free_page(cur_page);
list_add(&cur_page->lru, &h);
count++;
}
}
ttm_put_pages(&h, count, ttm->page_flags, ttm->caching_state);
ttm->state = tt_unpopulated;
ttm->first_himem_page = ttm->num_pages;
ttm->last_lomem_page = -1;

74
include/drm/ttm/ttm_page_alloc.h Normal file
View File

@ -0,0 +1,74 @@
/*
* Copyright (c) Red Hat Inc.
* 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 AUTHORS OR COPYRIGHT HOLDERS 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: Dave Airlie <airlied@redhat.com>
* Jerome Glisse <jglisse@redhat.com>
*/
#ifndef TTM_PAGE_ALLOC
#define TTM_PAGE_ALLOC
#include "ttm_bo_driver.h"
#include "ttm_memory.h"
/**
* Get count number of pages from pool to pages list.
*
* @pages: heado of empty linked list where pages are filled.
* @flags: ttm flags for page allocation.
* @cstate: ttm caching state for the page.
* @count: number of pages to allocate.
*/
int ttm_get_pages(struct list_head *pages,
int flags,
enum ttm_caching_state cstate,
unsigned count);
/**
* Put linked list of pages to pool.
*
* @pages: list of pages to free.
* @page_count: number of pages in the list. Zero can be passed for unknown
* count.
* @flags: ttm flags for page allocation.
* @cstate: ttm caching state.
*/
void ttm_put_pages(struct list_head *pages,
unsigned page_count,
int flags,
enum ttm_caching_state cstate);
/**
* Initialize pool allocator.
*
* Pool allocator is internaly reference counted so it can be initialized
* multiple times but ttm_page_alloc_fini has to be called same number of
* times.
*/
int ttm_page_alloc_init(struct ttm_mem_global *glob, unsigned max_pages);
/**
* Free pool allocator.
*/
void ttm_page_alloc_fini(void);
/**
* Output the state of pools to debugfs file
*/
extern int ttm_page_alloc_debugfs(struct seq_file *m, void *data);
#endif