[PATCH v4 09/12] drm/ttm/pool: Provide a helper to shrink pages
Thomas Hellström
thomas.hellstrom at linux.intel.com
Fri Jun 14 10:25:45 UTC 2024
Provide a helper to shrink ttm_tt page-vectors on a per-page
basis. A ttm_backup backend could then in theory get away with
allocating a single temporary page for each struct ttm_tt.
This is accomplished by splitting larger pages before trying to
back them up.
In the future we could allow ttm_backup to handle backing up
large pages as well, but currently there's no benefit in
doing that, since the shmem backup backend would have to
split those anyway to avoid allocating too much temporary
memory, and if the backend instead inserts pages into the
swap-cache, those are split on reclaim by the core.
Due to potential backup- and recover errors, allow partially swapped
out struct ttm_tt's, although mark them as swapped out stopping them
from being swapped out a second time. More details in the ttm_pool.c
DOC section.
v2:
- A couple of cleanups and error fixes in ttm_pool_back_up_tt.
- s/back_up/backup/
- Add a writeback parameter to the exported interface.
Cc: Christian König <christian.koenig at amd.com>
Cc: Somalapuram Amaranath <Amaranath.Somalapuram at amd.com>
Cc: Matthew Brost <matthew.brost at intel.com>
Cc: <dri-devel at lists.freedesktop.org>
Signed-off-by: Thomas Hellström <thomas.hellstrom at linux.intel.com>
---
drivers/gpu/drm/ttm/ttm_pool.c | 397 +++++++++++++++++++++++++++++++--
drivers/gpu/drm/ttm/ttm_tt.c | 37 +++
include/drm/ttm/ttm_pool.h | 5 +
include/drm/ttm/ttm_tt.h | 20 ++
4 files changed, 446 insertions(+), 13 deletions(-)
diff --git a/drivers/gpu/drm/ttm/ttm_pool.c b/drivers/gpu/drm/ttm/ttm_pool.c
index 6e1fd6985ffc..38e50cf81b0a 100644
--- a/drivers/gpu/drm/ttm/ttm_pool.c
+++ b/drivers/gpu/drm/ttm/ttm_pool.c
@@ -41,6 +41,7 @@
#include <asm/set_memory.h>
#endif
+#include <drm/ttm/ttm_backup.h>
#include <drm/ttm/ttm_pool.h>
#include <drm/ttm/ttm_tt.h>
#include <drm/ttm/ttm_bo.h>
@@ -58,6 +59,32 @@ struct ttm_pool_dma {
unsigned long vaddr;
};
+/**
+ * struct ttm_pool_tt_restore - State representing restore from backup
+ * @alloced_pages: Total number of already allocated pages for the ttm_tt.
+ * @restored_pages: Number of (sub) pages restored from swap for this
+ * chunk of 1 << @order pages.
+ * @first_page: The ttm page ptr representing for @old_pages[0].
+ * @caching_divide: Page pointer where subsequent pages are cached.
+ * @old_pages: Backup copy of page pointers that were replaced by the new
+ * page allocation.
+ * @pool: The pool used for page allocation while restoring.
+ * @order: The order of the last page allocated while restoring.
+ *
+ * Recovery from backup might fail when we've recovered less than the
+ * full ttm_tt. In order not to loose any data (yet), keep information
+ * around that allows us to restart a failed ttm backup recovery.
+ */
+struct ttm_pool_tt_restore {
+ pgoff_t alloced_pages;
+ pgoff_t restored_pages;
+ struct page **first_page;
+ struct page **caching_divide;
+ struct ttm_pool *pool;
+ unsigned int order;
+ struct page *old_pages[];
+};
+
static unsigned long page_pool_size;
MODULE_PARM_DESC(page_pool_size, "Number of pages in the WC/UC/DMA pool");
@@ -354,11 +381,102 @@ static unsigned int ttm_pool_page_order(struct ttm_pool *pool, struct page *p)
return p->private;
}
+/*
+ * To be able to insert single pages into backup directly,
+ * we need to split multi-order page allocations and make them look
+ * like single-page allocations.
+ */
+static void ttm_pool_split_for_swap(struct ttm_pool *pool, struct page *p)
+{
+ unsigned int order = ttm_pool_page_order(pool, p);
+ pgoff_t nr;
+
+ if (!order)
+ return;
+
+ split_page(p, order);
+ nr = 1UL << order;
+ while (nr--)
+ (p++)->private = 0;
+}
+
+/**
+ * DOC: Partial backup and restoration of a struct ttm_tt.
+ *
+ * Swapout using ttm_backup::ops::backup_page() and swapin using
+ * ttm_backup::ops::copy_backed_up_page() may fail.
+ * The former most likely due to lack of swap-space or memory, the latter due
+ * to lack of memory or because of signal interruption during waits.
+ *
+ * Backupfailure is easily handled by using a ttm_tt pages vector that holds
+ * both swap entries and page pointers. This has to be taken into account when
+ * restoring such a ttm_tt from backup, and when freeing it while backed up.
+ * When restoring, for simplicity, new pages are actually allocated from the
+ * pool and the contents of any old pages are copied in and then the old pages
+ * are released.
+ *
+ * For restoration failures, the struct ttm_pool_tt_restore holds sufficient state
+ * to be able to resume an interrupted restore, and that structure is freed once
+ * the restoration is complete. If the struct ttm_tt is destroyed while there
+ * is a valid struct ttm_pool_tt_restore attached, that is also properly taken
+ * care of.
+ */
+
+static bool ttm_pool_restore_valid(const struct ttm_pool_tt_restore *restore)
+{
+ return restore && restore->restored_pages < (1 << restore->order);
+}
+
+static int ttm_pool_restore_tt(struct ttm_pool_tt_restore *restore,
+ struct ttm_backup *backup,
+ struct ttm_operation_ctx *ctx)
+{
+ unsigned int i, nr = 1 << restore->order;
+ int ret = 0;
+
+ if (!ttm_pool_restore_valid(restore))
+ return 0;
+
+ for (i = restore->restored_pages; i < nr; ++i) {
+ struct page *p = restore->old_pages[i];
+
+ if (ttm_backup_page_ptr_is_handle(p)) {
+ unsigned long handle = ttm_backup_page_ptr_to_handle(p);
+
+ if (handle == 0)
+ continue;
+
+ ret = backup->ops->copy_backed_up_page
+ (backup, restore->first_page[i],
+ handle, ctx->interruptible);
+ if (ret)
+ break;
+
+ backup->ops->drop(backup, handle);
+ } else if (p) {
+ /*
+ * We could probably avoid splitting the old page
+ * using clever logic, but ATM we don't care.
+ */
+ ttm_pool_split_for_swap(restore->pool, p);
+ copy_highpage(restore->first_page[i], p);
+ __free_pages(p, 0);
+ }
+
+ restore->restored_pages++;
+ restore->old_pages[i] = NULL;
+ cond_resched();
+ }
+
+ return ret;
+}
+
/* Called when we got a page, either from a pool or newly allocated */
static int ttm_pool_page_allocated(struct ttm_pool *pool, unsigned int order,
struct page *p, dma_addr_t **dma_addr,
unsigned long *num_pages,
- struct page ***pages)
+ struct page ***pages,
+ struct ttm_pool_tt_restore *restore)
{
unsigned int i;
int r;
@@ -369,6 +487,16 @@ static int ttm_pool_page_allocated(struct ttm_pool *pool, unsigned int order,
return r;
}
+ if (restore) {
+ memcpy(restore->old_pages, *pages,
+ (1 << order) * sizeof(*restore->old_pages));
+ memset(*pages, 0, (1 << order) * sizeof(**pages));
+ restore->order = order;
+ restore->restored_pages = 0;
+ restore->first_page = *pages;
+ restore->alloced_pages += 1UL << order;
+ }
+
*num_pages -= 1 << order;
for (i = 1 << order; i; --i, ++(*pages), ++p)
**pages = p;
@@ -394,22 +522,39 @@ static void ttm_pool_free_range(struct ttm_pool *pool, struct ttm_tt *tt,
pgoff_t start_page, pgoff_t end_page)
{
struct page **pages = &tt->pages[start_page];
+ struct ttm_backup *backup = tt->backup;
unsigned int order;
pgoff_t i, nr;
for (i = start_page; i < end_page; i += nr, pages += nr) {
struct ttm_pool_type *pt = NULL;
+ struct page *p = *pages;
+
+ if (ttm_backup_page_ptr_is_handle(p)) {
+ unsigned long handle = ttm_backup_page_ptr_to_handle(p);
+
+ nr = 1;
+ if (handle != 0)
+ backup->ops->drop(backup, handle);
+ continue;
+ }
+
+ if (pool) {
+ order = ttm_pool_page_order(pool, p);
+ nr = (1UL << order);
+ if (tt->dma_address)
+ ttm_pool_unmap(pool, tt->dma_address[i], nr);
- order = ttm_pool_page_order(pool, *pages);
- nr = (1UL << order);
- if (tt->dma_address)
- ttm_pool_unmap(pool, tt->dma_address[i], nr);
+ pt = ttm_pool_select_type(pool, caching, order);
+ } else {
+ order = p->private;
+ nr = (1UL << order);
+ }
- pt = ttm_pool_select_type(pool, caching, order);
if (pt)
- ttm_pool_type_give(pt, *pages);
+ ttm_pool_type_give(pt, p);
else
- ttm_pool_free_page(pool, caching, order, *pages);
+ ttm_pool_free_page(pool, caching, order, p);
}
}
@@ -453,9 +598,37 @@ int ttm_pool_alloc(struct ttm_pool *pool, struct ttm_tt *tt,
else
gfp_flags |= GFP_HIGHUSER;
- for (order = min_t(unsigned int, MAX_PAGE_ORDER, __fls(num_pages));
- num_pages;
- order = min_t(unsigned int, order, __fls(num_pages))) {
+ order = min_t(unsigned int, MAX_PAGE_ORDER, __fls(num_pages));
+
+ if (tt->page_flags & TTM_TT_FLAG_PRIV_BACKED_UP) {
+ if (!tt->restore) {
+ gfp_t gfp = GFP_KERNEL | __GFP_NOWARN;
+
+ if (ctx->gfp_retry_mayfail)
+ gfp |= __GFP_RETRY_MAYFAIL;
+
+ tt->restore =
+ kvzalloc(struct_size(tt->restore, old_pages,
+ (size_t)1 << order), gfp);
+ /* RFC: Possibly loop on -ENOMEM and reduce order. */
+ if (!tt->restore)
+ return -ENOMEM;
+ } else if (ttm_pool_restore_valid(tt->restore)) {
+ struct ttm_pool_tt_restore *restore = tt->restore;
+
+ num_pages -= restore->alloced_pages;
+ order = min_t(unsigned int, order, __fls(num_pages));
+ pages += restore->alloced_pages;
+ r = ttm_pool_restore_tt(restore, tt->backup, ctx);
+ if (r)
+ return r;
+ caching = restore->caching_divide;
+ }
+
+ tt->restore->pool = pool;
+ }
+
+ for (; num_pages; order = min_t(unsigned int, order, __fls(num_pages))) {
struct ttm_pool_type *pt;
page_caching = tt->caching;
@@ -472,11 +645,19 @@ int ttm_pool_alloc(struct ttm_pool *pool, struct ttm_tt *tt,
r = ttm_pool_page_allocated(pool, order, p,
&dma_addr,
&num_pages,
- &pages);
+ &pages,
+ tt->restore);
if (r)
goto error_free_page;
caching = pages;
+ if (ttm_pool_restore_valid(tt->restore)) {
+ r = ttm_pool_restore_tt(tt->restore, tt->backup,
+ ctx);
+ if (r)
+ goto error_free_all;
+ }
+
if (num_pages < (1 << order))
break;
@@ -496,9 +677,17 @@ int ttm_pool_alloc(struct ttm_pool *pool, struct ttm_tt *tt,
caching = pages;
}
r = ttm_pool_page_allocated(pool, order, p, &dma_addr,
- &num_pages, &pages);
+ &num_pages, &pages,
+ tt->restore);
if (r)
goto error_free_page;
+
+ if (ttm_pool_restore_valid(tt->restore)) {
+ r = ttm_pool_restore_tt(tt->restore, tt->backup, ctx);
+ if (r)
+ goto error_free_all;
+ }
+
if (PageHighMem(p))
caching = pages;
}
@@ -517,12 +706,26 @@ int ttm_pool_alloc(struct ttm_pool *pool, struct ttm_tt *tt,
if (r)
goto error_free_all;
+ if (tt->restore) {
+ kvfree(tt->restore);
+ tt->restore = NULL;
+ }
+
+ if (tt->page_flags & TTM_TT_FLAG_PRIV_BACKED_UP)
+ tt->page_flags &= ~(TTM_TT_FLAG_PRIV_BACKED_UP |
+ TTM_TT_FLAG_SWAPPED);
+
return 0;
error_free_page:
ttm_pool_free_page(pool, page_caching, order, p);
error_free_all:
+ if (tt->page_flags & TTM_TT_FLAG_PRIV_BACKED_UP) {
+ tt->restore->caching_divide = caching;
+ return r;
+ }
+
num_pages = tt->num_pages - num_pages;
caching_divide = caching - tt->pages;
ttm_pool_free_range(pool, tt, tt->caching, 0, caching_divide);
@@ -549,6 +752,174 @@ void ttm_pool_free(struct ttm_pool *pool, struct ttm_tt *tt)
}
EXPORT_SYMBOL(ttm_pool_free);
+/**
+ * ttm_pool_release_backed_up() - Release content of a swapped-out struct ttm_tt
+ * @tt: The struct ttm_tt.
+ *
+ * Release handles with associated content or any remaining pages of
+ * a backed-up struct ttm_tt.
+ */
+void ttm_pool_release_backed_up(struct ttm_tt *tt)
+{
+ struct ttm_backup *backup = tt->backup;
+ struct ttm_pool_tt_restore *restore;
+ pgoff_t i, start_page = 0;
+ unsigned long handle;
+
+ if (!(tt->page_flags & TTM_TT_FLAG_PRIV_BACKED_UP))
+ return;
+
+ restore = tt->restore;
+
+ if (ttm_pool_restore_valid(restore)) {
+ pgoff_t nr = 1UL << restore->order;
+
+ for (i = restore->restored_pages; i < nr; ++i) {
+ struct page *p = restore->old_pages[i];
+
+ if (ttm_backup_page_ptr_is_handle(p)) {
+ handle = ttm_backup_page_ptr_to_handle(p);
+ if (handle == 0)
+ continue;
+
+ backup->ops->drop(backup, handle);
+ } else if (p) {
+ ttm_pool_split_for_swap(restore->pool, p);
+ __free_pages(p, 0);
+ }
+ }
+ }
+
+ if (restore) {
+ pgoff_t mid = restore->caching_divide - tt->pages;
+
+ start_page = restore->alloced_pages;
+ /* Pages that might be dma-mapped and non-cached */
+ ttm_pool_free_range(restore->pool, tt, tt->caching,
+ 0, mid);
+ /* Pages that might be dma-mapped but cached */
+ ttm_pool_free_range(restore->pool, tt, ttm_cached,
+ mid, restore->alloced_pages);
+ }
+
+ /* Shrunken pages. Cached and not dma-mapped. */
+ ttm_pool_free_range(NULL, tt, ttm_cached, start_page, tt->num_pages);
+
+ if (restore) {
+ kvfree(restore);
+ tt->restore = NULL;
+ }
+
+ tt->page_flags &= ~(TTM_TT_FLAG_PRIV_BACKED_UP | TTM_TT_FLAG_SWAPPED);
+}
+
+/**
+ * ttm_pool_backup_tt() - Back up or purge a struct ttm_tt
+ * @pool: The pool used when allocating the struct ttm_tt.
+ * @ttm: The struct ttm_tt.
+ * @purge: Don't back up but release pages directly to system.
+ * @writeback: If !@purge, Try to write out directly to the
+ * underlying persistent media.
+ *
+ * Back up or purge a struct ttm_tt. If @purge is true, then
+ * all pages will be freed directly to the system rather than to the pool
+ * they were allocated from, making the function behave similarly to
+ * ttm_pool_free(). If @purge is false the pages will be backed up instead,
+ * exchanged for handles.
+ * A subsequent call to ttm_pool_alloc() will then read back the content and
+ * a subsequent call to ttm_pool_release_shrunken() will drop it.
+ * If backup of a page fails for whatever reason, @ttm will still be
+ * partially backed up, retaining those pages for which backup fails.
+ *
+ * Return: Number of pages actually backed up or freed, or negative
+ * error code on error.
+ */
+long ttm_pool_backup_tt(struct ttm_pool *pool, struct ttm_tt *ttm, bool purge,
+ bool writeback)
+{
+ struct ttm_backup *backup = ttm->backup;
+ struct page *page;
+ unsigned long handle;
+ gfp_t alloc_gfp;
+ gfp_t gfp;
+ int ret = 0;
+ pgoff_t shrunken = 0;
+ pgoff_t i, num_pages;
+
+ if ((!get_nr_swap_pages() && !purge) ||
+ pool->use_dma_alloc ||
+ (ttm->page_flags & TTM_TT_FLAG_PRIV_BACKED_UP))
+ return -EBUSY;
+
+#ifdef CONFIG_X86
+ /* Anything returned to the system needs to be cached. */
+ if (ttm->caching != ttm_cached)
+ set_pages_array_wb(ttm->pages, ttm->num_pages);
+#endif
+
+ if (ttm->dma_address || purge) {
+ for (i = 0; i < ttm->num_pages; i += num_pages) {
+ unsigned int order;
+
+ page = ttm->pages[i];
+ if (unlikely(!page)) {
+ num_pages = 1;
+ continue;
+ }
+
+ order = ttm_pool_page_order(pool, page);
+ num_pages = 1UL << order;
+ if (ttm->dma_address)
+ ttm_pool_unmap(pool, ttm->dma_address[i],
+ num_pages);
+ if (purge) {
+ shrunken += num_pages;
+ page->private = 0;
+ __free_pages(page, order);
+ memset(ttm->pages + i, 0,
+ num_pages * sizeof(*ttm->pages));
+ }
+ }
+ }
+
+ if (purge)
+ return shrunken;
+
+ if (pool->use_dma32)
+ gfp = GFP_DMA32;
+ else
+ gfp = GFP_HIGHUSER;
+
+ alloc_gfp = GFP_KERNEL | __GFP_HIGH | __GFP_NOWARN | __GFP_RETRY_MAYFAIL;
+
+ for (i = 0; i < ttm->num_pages; ++i) {
+ page = ttm->pages[i];
+ if (unlikely(!page))
+ continue;
+
+ ttm_pool_split_for_swap(pool, page);
+
+ handle = backup->ops->backup_page(backup, page, writeback, i,
+ gfp, alloc_gfp);
+ if (handle) {
+ ttm->pages[i] = ttm_backup_handle_to_page_ptr(handle);
+ put_page(page);
+ shrunken++;
+ } else {
+ /* We allow partially shrunken tts */
+ ret = -ENOMEM;
+ break;
+ }
+ cond_resched();
+ }
+
+ if (shrunken)
+ ttm->page_flags |= (TTM_TT_FLAG_PRIV_BACKED_UP |
+ TTM_TT_FLAG_SWAPPED);
+
+ return shrunken ? shrunken : ret;
+}
+
/**
* ttm_pool_init - Initialize a pool
*
diff --git a/drivers/gpu/drm/ttm/ttm_tt.c b/drivers/gpu/drm/ttm/ttm_tt.c
index 7b00ddf0ce49..bc994b8e7e73 100644
--- a/drivers/gpu/drm/ttm/ttm_tt.c
+++ b/drivers/gpu/drm/ttm/ttm_tt.c
@@ -40,6 +40,7 @@
#include <drm/drm_cache.h>
#include <drm/drm_device.h>
#include <drm/drm_util.h>
+#include <drm/ttm/ttm_backup.h>
#include <drm/ttm/ttm_bo.h>
#include <drm/ttm/ttm_tt.h>
@@ -158,6 +159,7 @@ static void ttm_tt_init_fields(struct ttm_tt *ttm,
ttm->swap_storage = NULL;
ttm->sg = bo->sg;
ttm->caching = caching;
+ ttm->restore = NULL;
}
int ttm_tt_init(struct ttm_tt *ttm, struct ttm_buffer_object *bo,
@@ -182,6 +184,12 @@ void ttm_tt_fini(struct ttm_tt *ttm)
fput(ttm->swap_storage);
ttm->swap_storage = NULL;
+ ttm_pool_release_backed_up(ttm);
+ if (ttm->backup) {
+ ttm->backup->ops->fini(ttm->backup);
+ ttm->backup = NULL;
+ }
+
if (ttm->pages)
kvfree(ttm->pages);
else
@@ -252,6 +260,35 @@ int ttm_tt_swapin(struct ttm_tt *ttm)
return ret;
}
+/**
+ * ttm_tt_backup() - Helper to back up a struct ttm_tt.
+ * @bdev: The TTM device.
+ * @tt: The struct ttm_tt.
+ * @purge: Don't back up but release pages directly to system,
+ * bypassing any pooling.
+ * @writeback: If !@purge, try to write out directly to the
+ * underlying persistent media.
+ *
+ * Helper for a TTM driver to use from the bo_shrink() method to shrink
+ * a struct ttm_tt, after it has done the necessary unbinding. This function
+ * will update the page accounting and call ttm_pool_shrink_tt to free pages
+ * or move them to the swap cache.
+ *
+ * Return: Number of pages freed or swapped out, or negative error code on
+ * error.
+ */
+long ttm_tt_backup(struct ttm_device *bdev, struct ttm_tt *tt, bool purge,
+ bool writeback)
+{
+ long ret = ttm_pool_backup_tt(&bdev->pool, tt, purge, writeback);
+
+ if (ret > 0)
+ tt->page_flags &= ~TTM_TT_FLAG_PRIV_POPULATED;
+
+ return ret;
+}
+EXPORT_SYMBOL(ttm_tt_backup);
+
/**
* ttm_tt_swapout - swap out tt object
*
diff --git a/include/drm/ttm/ttm_pool.h b/include/drm/ttm/ttm_pool.h
index 160d954a261e..4e4db369952b 100644
--- a/include/drm/ttm/ttm_pool.h
+++ b/include/drm/ttm/ttm_pool.h
@@ -89,6 +89,11 @@ void ttm_pool_fini(struct ttm_pool *pool);
int ttm_pool_debugfs(struct ttm_pool *pool, struct seq_file *m);
+void ttm_pool_release_backed_up(struct ttm_tt *tt);
+
+long ttm_pool_backup_tt(struct ttm_pool *pool, struct ttm_tt *ttm,
+ bool purge, bool writeback);
+
int ttm_pool_mgr_init(unsigned long num_pages);
void ttm_pool_mgr_fini(void);
diff --git a/include/drm/ttm/ttm_tt.h b/include/drm/ttm/ttm_tt.h
index 2b9d856ff388..6b990f1e7dd0 100644
--- a/include/drm/ttm/ttm_tt.h
+++ b/include/drm/ttm/ttm_tt.h
@@ -32,11 +32,13 @@
#include <drm/ttm/ttm_caching.h>
#include <drm/ttm/ttm_kmap_iter.h>
+struct ttm_backup;
struct ttm_device;
struct ttm_tt;
struct ttm_resource;
struct ttm_buffer_object;
struct ttm_operation_ctx;
+struct ttm_pool_tt_restore;
/**
* struct ttm_tt - This is a structure holding the pages, caching- and aperture
@@ -85,6 +87,9 @@ struct ttm_tt {
* fault handling abuses the DMA api a bit and dma_map_attrs can't be
* used to assure pgprot always matches.
*
+ * TTM_TT_FLAG_PRIV_BACKED_UP: TTM internal only. This is set if the
+ * struct ttm_tt has been (possibly partially) backed up.
+ *
* TTM_TT_FLAG_PRIV_POPULATED: TTM internal only. DO NOT USE. This is
* set by TTM after ttm_tt_populate() has successfully returned, and is
* then unset when TTM calls ttm_tt_unpopulate().
@@ -96,6 +101,7 @@ struct ttm_tt {
#define TTM_TT_FLAG_DECRYPTED BIT(4)
#define TTM_TT_FLAG_PRIV_POPULATED BIT(5)
+#define TTM_TT_FLAG_PRIV_BACKED_UP BIT(6)
uint32_t page_flags;
/** @num_pages: Number of pages in the page array. */
uint32_t num_pages;
@@ -105,11 +111,21 @@ struct ttm_tt {
dma_addr_t *dma_address;
/** @swap_storage: Pointer to shmem struct file for swap storage. */
struct file *swap_storage;
+ /**
+ * @backup: Pointer to backup struct for backed up tts.
+ * RFC: Could possibly be unified with @swap_storage.
+ */
+ struct ttm_backup *backup;
/**
* @caching: The current caching state of the pages, see enum
* ttm_caching.
*/
enum ttm_caching caching;
+ /**
+ * @restore: Partial restoration from backup state.
+ * RFC: Incorporate in struct ttm_backup?
+ */
+ struct ttm_pool_tt_restore *restore;
};
/**
@@ -230,6 +246,10 @@ void ttm_tt_mgr_init(unsigned long num_pages, unsigned long num_dma32_pages);
struct ttm_kmap_iter *ttm_kmap_iter_tt_init(struct ttm_kmap_iter_tt *iter_tt,
struct ttm_tt *tt);
unsigned long ttm_tt_pages_limit(void);
+
+long ttm_tt_backup(struct ttm_device *bdev, struct ttm_tt *tt, bool purge,
+ bool writeback);
+
#if IS_ENABLED(CONFIG_AGP)
#include <linux/agp_backend.h>
--
2.44.0
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