kernel-ark/drivers/gpu/drm/ttm/ttm_tt.c
Dave Airlie df67bed92f drm/radeon/kms: fix coherency issues on AGP cards.
When we are evicting from VRAM->RAM we allocate the ttm object,
but we don't set the caching policy on it before blitting into it.
This means on AGP we end up blitting into cached pages, and
the CPU later flushes out on top of them. This was mostly seen as
font corruption.

The other question is why we don't evict VRAM->GTT in a lot of cases,
this would save us some cache transitions since a lot of objects
that are evicted from VRAM will probably end up being pulled back in
a few operations later, and evicting them to system memory involves
2 unnecessary cache transitions.

Signed-off-by: Dave Airlie <airlied@redhat.com>
2009-11-04 09:53:14 +10:00

586 lines
13 KiB
C

/**************************************************************************
*
* 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.
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**************************************************************************/
/*
* Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
*/
#include <linux/vmalloc.h>
#include <linux/sched.h>
#include <linux/highmem.h>
#include <linux/pagemap.h>
#include <linux/file.h>
#include <linux/swap.h>
#include "drm_cache.h"
#include "ttm/ttm_module.h"
#include "ttm/ttm_bo_driver.h"
#include "ttm/ttm_placement.h"
static int ttm_tt_swapin(struct ttm_tt *ttm);
/**
* Allocates storage for pointers to the pages that back the ttm.
*
* Uses kmalloc if possible. Otherwise falls back to vmalloc.
*/
static void ttm_tt_alloc_page_directory(struct ttm_tt *ttm)
{
unsigned long size = ttm->num_pages * sizeof(*ttm->pages);
ttm->pages = NULL;
if (size <= PAGE_SIZE)
ttm->pages = kzalloc(size, GFP_KERNEL);
if (!ttm->pages) {
ttm->pages = vmalloc_user(size);
if (ttm->pages)
ttm->page_flags |= TTM_PAGE_FLAG_VMALLOC;
}
}
static void ttm_tt_free_page_directory(struct ttm_tt *ttm)
{
if (ttm->page_flags & TTM_PAGE_FLAG_VMALLOC) {
vfree(ttm->pages);
ttm->page_flags &= ~TTM_PAGE_FLAG_VMALLOC;
} else {
kfree(ttm->pages);
}
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;
int dirty;
struct page *page;
int i;
struct ttm_backend *be = ttm->be;
BUG_ON(!(ttm->page_flags & TTM_PAGE_FLAG_USER));
write = ((ttm->page_flags & TTM_PAGE_FLAG_WRITE) != 0);
dirty = ((ttm->page_flags & TTM_PAGE_FLAG_USER_DIRTY) != 0);
if (be)
be->func->clear(be);
for (i = 0; i < ttm->num_pages; ++i) {
page = ttm->pages[i];
if (page == NULL)
continue;
if (page == ttm->dummy_read_page) {
BUG_ON(write);
continue;
}
if (write && dirty && !PageReserved(page))
set_page_dirty_lock(page);
ttm->pages[i] = NULL;
ttm_mem_global_free(ttm->glob->mem_glob, PAGE_SIZE);
put_page(page);
}
ttm->state = tt_unpopulated;
ttm->first_himem_page = ttm->num_pages;
ttm->last_lomem_page = -1;
}
static struct page *__ttm_tt_get_page(struct ttm_tt *ttm, int index)
{
struct page *p;
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)
return NULL;
ret = ttm_mem_global_alloc_page(mem_glob, p, false, false);
if (unlikely(ret != 0))
goto out_err;
if (PageHighMem(p))
ttm->pages[--ttm->first_himem_page] = p;
else
ttm->pages[++ttm->last_lomem_page] = p;
}
return p;
out_err:
put_page(p);
return NULL;
}
struct page *ttm_tt_get_page(struct ttm_tt *ttm, int index)
{
int ret;
if (unlikely(ttm->page_flags & TTM_PAGE_FLAG_SWAPPED)) {
ret = ttm_tt_swapin(ttm);
if (unlikely(ret != 0))
return NULL;
}
return __ttm_tt_get_page(ttm, index);
}
int ttm_tt_populate(struct ttm_tt *ttm)
{
struct page *page;
unsigned long i;
struct ttm_backend *be;
int ret;
if (ttm->state != tt_unpopulated)
return 0;
if (unlikely(ttm->page_flags & TTM_PAGE_FLAG_SWAPPED)) {
ret = ttm_tt_swapin(ttm);
if (unlikely(ret != 0))
return ret;
}
be = ttm->be;
for (i = 0; i < ttm->num_pages; ++i) {
page = __ttm_tt_get_page(ttm, i);
if (!page)
return -ENOMEM;
}
be->func->populate(be, ttm->num_pages, ttm->pages,
ttm->dummy_read_page);
ttm->state = tt_unbound;
return 0;
}
#ifdef CONFIG_X86
static inline int ttm_tt_set_page_caching(struct page *p,
enum ttm_caching_state c_state)
{
if (PageHighMem(p))
return 0;
switch (c_state) {
case tt_cached:
return set_pages_wb(p, 1);
case tt_wc:
return set_memory_wc((unsigned long) page_address(p), 1);
default:
return set_pages_uc(p, 1);
}
}
#else /* CONFIG_X86 */
static inline int ttm_tt_set_page_caching(struct page *p,
enum ttm_caching_state c_state)
{
return 0;
}
#endif /* CONFIG_X86 */
/*
* Change caching policy for the linear kernel map
* for range of pages in a ttm.
*/
static int ttm_tt_set_caching(struct ttm_tt *ttm,
enum ttm_caching_state c_state)
{
int i, j;
struct page *cur_page;
int ret;
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->caching_state == tt_cached)
drm_clflush_pages(ttm->pages, ttm->num_pages);
for (i = 0; i < ttm->num_pages; ++i) {
cur_page = ttm->pages[i];
if (likely(cur_page != NULL)) {
ret = ttm_tt_set_page_caching(cur_page, c_state);
if (unlikely(ret != 0))
goto out_err;
}
}
ttm->caching_state = c_state;
return 0;
out_err:
for (j = 0; j < i; ++j) {
cur_page = ttm->pages[j];
if (likely(cur_page != NULL)) {
(void)ttm_tt_set_page_caching(cur_page,
ttm->caching_state);
}
}
return ret;
}
int ttm_tt_set_placement_caching(struct ttm_tt *ttm, uint32_t placement)
{
enum ttm_caching_state state;
if (placement & TTM_PL_FLAG_WC)
state = tt_wc;
else if (placement & TTM_PL_FLAG_UNCACHED)
state = tt_uncached;
else
state = tt_cached;
return ttm_tt_set_caching(ttm, state);
}
EXPORT_SYMBOL(ttm_tt_set_placement_caching);
static void ttm_tt_free_alloced_pages(struct ttm_tt *ttm)
{
int i;
struct page *cur_page;
struct ttm_backend *be = ttm->be;
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) {
if (page_count(cur_page) != 1)
printk(KERN_ERR TTM_PFX
"Erroneous page count. "
"Leaking pages.\n");
ttm_mem_global_free_page(ttm->glob->mem_glob,
cur_page);
__free_page(cur_page);
}
}
ttm->state = tt_unpopulated;
ttm->first_himem_page = ttm->num_pages;
ttm->last_lomem_page = -1;
}
void ttm_tt_destroy(struct ttm_tt *ttm)
{
struct ttm_backend *be;
if (unlikely(ttm == NULL))
return;
be = ttm->be;
if (likely(be != NULL)) {
be->func->destroy(be);
ttm->be = NULL;
}
if (likely(ttm->pages != NULL)) {
if (ttm->page_flags & TTM_PAGE_FLAG_USER)
ttm_tt_free_user_pages(ttm);
else
ttm_tt_free_alloced_pages(ttm);
ttm_tt_free_page_directory(ttm);
}
if (!(ttm->page_flags & TTM_PAGE_FLAG_PERSISTANT_SWAP) &&
ttm->swap_storage)
fput(ttm->swap_storage);
kfree(ttm);
}
int ttm_tt_set_user(struct ttm_tt *ttm,
struct task_struct *tsk,
unsigned long start, unsigned long num_pages)
{
struct mm_struct *mm = tsk->mm;
int ret;
int write = (ttm->page_flags & TTM_PAGE_FLAG_WRITE) != 0;
struct ttm_mem_global *mem_glob = ttm->glob->mem_glob;
BUG_ON(num_pages != ttm->num_pages);
BUG_ON((ttm->page_flags & TTM_PAGE_FLAG_USER) == 0);
/**
* Account user pages as lowmem pages for now.
*/
ret = ttm_mem_global_alloc(mem_glob, num_pages * PAGE_SIZE,
false, false);
if (unlikely(ret != 0))
return ret;
down_read(&mm->mmap_sem);
ret = get_user_pages(tsk, mm, start, num_pages,
write, 0, ttm->pages, NULL);
up_read(&mm->mmap_sem);
if (ret != num_pages && write) {
ttm_tt_free_user_pages(ttm);
ttm_mem_global_free(mem_glob, num_pages * PAGE_SIZE);
return -ENOMEM;
}
ttm->tsk = tsk;
ttm->start = start;
ttm->state = tt_unbound;
return 0;
}
struct ttm_tt *ttm_tt_create(struct ttm_bo_device *bdev, unsigned long size,
uint32_t page_flags, struct page *dummy_read_page)
{
struct ttm_bo_driver *bo_driver = bdev->driver;
struct ttm_tt *ttm;
if (!bo_driver)
return NULL;
ttm = kzalloc(sizeof(*ttm), GFP_KERNEL);
if (!ttm)
return NULL;
ttm->glob = bdev->glob;
ttm->num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
ttm->first_himem_page = ttm->num_pages;
ttm->last_lomem_page = -1;
ttm->caching_state = tt_cached;
ttm->page_flags = page_flags;
ttm->dummy_read_page = dummy_read_page;
ttm_tt_alloc_page_directory(ttm);
if (!ttm->pages) {
ttm_tt_destroy(ttm);
printk(KERN_ERR TTM_PFX "Failed allocating page table\n");
return NULL;
}
ttm->be = bo_driver->create_ttm_backend_entry(bdev);
if (!ttm->be) {
ttm_tt_destroy(ttm);
printk(KERN_ERR TTM_PFX "Failed creating ttm backend entry\n");
return NULL;
}
ttm->state = tt_unpopulated;
return ttm;
}
void ttm_tt_unbind(struct ttm_tt *ttm)
{
int ret;
struct ttm_backend *be = ttm->be;
if (ttm->state == tt_bound) {
ret = be->func->unbind(be);
BUG_ON(ret);
ttm->state = tt_unbound;
}
}
int ttm_tt_bind(struct ttm_tt *ttm, struct ttm_mem_reg *bo_mem)
{
int ret = 0;
struct ttm_backend *be;
if (!ttm)
return -EINVAL;
if (ttm->state == tt_bound)
return 0;
be = ttm->be;
ret = ttm_tt_populate(ttm);
if (ret)
return ret;
ret = be->func->bind(be, bo_mem);
if (ret) {
printk(KERN_ERR TTM_PFX "Couldn't bind backend.\n");
return ret;
}
ttm->state = tt_bound;
if (ttm->page_flags & TTM_PAGE_FLAG_USER)
ttm->page_flags |= TTM_PAGE_FLAG_USER_DIRTY;
return 0;
}
EXPORT_SYMBOL(ttm_tt_bind);
static int ttm_tt_swapin(struct ttm_tt *ttm)
{
struct address_space *swap_space;
struct file *swap_storage;
struct page *from_page;
struct page *to_page;
void *from_virtual;
void *to_virtual;
int i;
int ret;
if (ttm->page_flags & TTM_PAGE_FLAG_USER) {
ret = ttm_tt_set_user(ttm, ttm->tsk, ttm->start,
ttm->num_pages);
if (unlikely(ret != 0))
return ret;
ttm->page_flags &= ~TTM_PAGE_FLAG_SWAPPED;
return 0;
}
swap_storage = ttm->swap_storage;
BUG_ON(swap_storage == NULL);
swap_space = swap_storage->f_path.dentry->d_inode->i_mapping;
for (i = 0; i < ttm->num_pages; ++i) {
from_page = read_mapping_page(swap_space, i, NULL);
if (IS_ERR(from_page))
goto out_err;
to_page = __ttm_tt_get_page(ttm, i);
if (unlikely(to_page == NULL))
goto out_err;
preempt_disable();
from_virtual = kmap_atomic(from_page, KM_USER0);
to_virtual = kmap_atomic(to_page, KM_USER1);
memcpy(to_virtual, from_virtual, PAGE_SIZE);
kunmap_atomic(to_virtual, KM_USER1);
kunmap_atomic(from_virtual, KM_USER0);
preempt_enable();
page_cache_release(from_page);
}
if (!(ttm->page_flags & TTM_PAGE_FLAG_PERSISTANT_SWAP))
fput(swap_storage);
ttm->swap_storage = NULL;
ttm->page_flags &= ~TTM_PAGE_FLAG_SWAPPED;
return 0;
out_err:
ttm_tt_free_alloced_pages(ttm);
return -ENOMEM;
}
int ttm_tt_swapout(struct ttm_tt *ttm, struct file *persistant_swap_storage)
{
struct address_space *swap_space;
struct file *swap_storage;
struct page *from_page;
struct page *to_page;
void *from_virtual;
void *to_virtual;
int i;
BUG_ON(ttm->state != tt_unbound && ttm->state != tt_unpopulated);
BUG_ON(ttm->caching_state != tt_cached);
/*
* For user buffers, just unpin the pages, as there should be
* vma references.
*/
if (ttm->page_flags & TTM_PAGE_FLAG_USER) {
ttm_tt_free_user_pages(ttm);
ttm->page_flags |= TTM_PAGE_FLAG_SWAPPED;
ttm->swap_storage = NULL;
return 0;
}
if (!persistant_swap_storage) {
swap_storage = shmem_file_setup("ttm swap",
ttm->num_pages << PAGE_SHIFT,
0);
if (unlikely(IS_ERR(swap_storage))) {
printk(KERN_ERR "Failed allocating swap storage.\n");
return -ENOMEM;
}
} else
swap_storage = persistant_swap_storage;
swap_space = swap_storage->f_path.dentry->d_inode->i_mapping;
for (i = 0; i < ttm->num_pages; ++i) {
from_page = ttm->pages[i];
if (unlikely(from_page == NULL))
continue;
to_page = read_mapping_page(swap_space, i, NULL);
if (unlikely(to_page == NULL))
goto out_err;
preempt_disable();
from_virtual = kmap_atomic(from_page, KM_USER0);
to_virtual = kmap_atomic(to_page, KM_USER1);
memcpy(to_virtual, from_virtual, PAGE_SIZE);
kunmap_atomic(to_virtual, KM_USER1);
kunmap_atomic(from_virtual, KM_USER0);
preempt_enable();
set_page_dirty(to_page);
mark_page_accessed(to_page);
page_cache_release(to_page);
}
ttm_tt_free_alloced_pages(ttm);
ttm->swap_storage = swap_storage;
ttm->page_flags |= TTM_PAGE_FLAG_SWAPPED;
if (persistant_swap_storage)
ttm->page_flags |= TTM_PAGE_FLAG_PERSISTANT_SWAP;
return 0;
out_err:
if (!persistant_swap_storage)
fput(swap_storage);
return -ENOMEM;
}