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drm/ttm/pool: Fix ttm_pool_alloc error path 

When hitting an error, the error path forgot to unmap dma mappings and
could call set_pages_wb() on already uncached pages.

Fix this by introducing a common ttm_pool_free_range() function that
does the right thing.

v2:
- Simplify that common function (Christian König)
v3:
- Rename that common function to ttm_pool_free_range() (Christian König)

Fixes: d099fc8f54 ("drm/ttm: new TT backend allocation pool v3")
Cc: Christian König <christian.koenig@amd.com>
Cc: Dave Airlie <airlied@redhat.com>
Cc: Christian Koenig <christian.koenig@amd.com>
Cc: Huang Rui <ray.huang@amd.com>
Cc: dri-devel@lists.freedesktop.org
Signed-off-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230404200650.11043-2-thomas.hellstrom@linux.intel.com
This commit is contained in:
Thomas Hellström 2023-04-04 22:06:48 +02:00
parent 864b438085
commit 379989e7cb
1 changed files with 51 additions and 30 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

81
drivers/gpu/drm/ttm/ttm_pool.c
View File

@ -367,6 +367,43 @@ static int ttm_pool_page_allocated(struct ttm_pool *pool, unsigned int order,
return 0;
}
/**
* ttm_pool_free_range() - Free a range of TTM pages
* @pool: The pool used for allocating.
* @tt: The struct ttm_tt holding the page pointers.
* @caching: The page caching mode used by the range.
* @start_page: index for first page to free.
* @end_page: index for last page to free + 1.
*
* During allocation the ttm_tt page-vector may be populated with ranges of
* pages with different attributes if allocation hit an error without being
* able to completely fulfill the allocation. This function can be used
* to free these individual ranges.
*/
static void ttm_pool_free_range(struct ttm_pool *pool, struct ttm_tt *tt,
enum ttm_caching caching,
pgoff_t start_page, pgoff_t end_page)
{
struct page **pages = tt->pages;
unsigned int order;
pgoff_t i, nr;
for (i = start_page; i < end_page; i += nr, pages += nr) {
struct ttm_pool_type *pt = NULL;
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);
if (pt)
ttm_pool_type_give(pt, *pages);
else
ttm_pool_free_page(pool, caching, order, *pages);
}
}
/**
* ttm_pool_alloc - Fill a ttm_tt object
*
@ -382,12 +419,14 @@ static int ttm_pool_page_allocated(struct ttm_pool *pool, unsigned int order,
int ttm_pool_alloc(struct ttm_pool *pool, struct ttm_tt *tt,
struct ttm_operation_ctx *ctx)
{
unsigned long num_pages = tt->num_pages;
pgoff_t num_pages = tt->num_pages;
dma_addr_t *dma_addr = tt->dma_address;
struct page **caching = tt->pages;
struct page **pages = tt->pages;
enum ttm_caching page_caching;
gfp_t gfp_flags = GFP_USER;
unsigned int i, order;
pgoff_t caching_divide;
unsigned int order;
struct page *p;
int r;
@ -410,6 +449,7 @@ int ttm_pool_alloc(struct ttm_pool *pool, struct ttm_tt *tt,
order = min_t(unsigned int, order, __fls(num_pages))) {
struct ttm_pool_type *pt;
page_caching = tt->caching;
pt = ttm_pool_select_type(pool, tt->caching, order);
p = pt ? ttm_pool_type_take(pt) : NULL;
if (p) {
@ -418,6 +458,7 @@ int ttm_pool_alloc(struct ttm_pool *pool, struct ttm_tt *tt,
if (r)
goto error_free_page;
caching = pages;
do {
r = ttm_pool_page_allocated(pool, order, p,
&dma_addr,
@ -426,14 +467,15 @@ int ttm_pool_alloc(struct ttm_pool *pool, struct ttm_tt *tt,
if (r)
goto error_free_page;
caching = pages;
if (num_pages < (1 << order))
break;
p = ttm_pool_type_take(pt);
} while (p);
caching = pages;
}
page_caching = ttm_cached;
while (num_pages >= (1 << order) &&
(p = ttm_pool_alloc_page(pool, gfp_flags, order))) {
@ -442,6 +484,7 @@ int ttm_pool_alloc(struct ttm_pool *pool, struct ttm_tt *tt,
tt->caching);
if (r)
goto error_free_page;
caching = pages;
}
r = ttm_pool_page_allocated(pool, order, p, &dma_addr,
&num_pages, &pages);
@ -468,15 +511,13 @@ int ttm_pool_alloc(struct ttm_pool *pool, struct ttm_tt *tt,
return 0;
error_free_page:
ttm_pool_free_page(pool, tt->caching, order, p);
ttm_pool_free_page(pool, page_caching, order, p);
error_free_all:
num_pages = tt->num_pages - num_pages;
for (i = 0; i < num_pages; ) {
order = ttm_pool_page_order(pool, tt->pages[i]);
ttm_pool_free_page(pool, tt->caching, order, tt->pages[i]);
i += 1 << order;
}
caching_divide = caching - tt->pages;
ttm_pool_free_range(pool, tt, tt->caching, 0, caching_divide);
ttm_pool_free_range(pool, tt, ttm_cached, caching_divide, num_pages);
return r;
}
@ -492,27 +533,7 @@ EXPORT_SYMBOL(ttm_pool_alloc);
*/
void ttm_pool_free(struct ttm_pool *pool, struct ttm_tt *tt)
{
unsigned int i;
for (i = 0; i < tt->num_pages; ) {
struct page *p = tt->pages[i];
unsigned int order, num_pages;
struct ttm_pool_type *pt;
order = ttm_pool_page_order(pool, p);
num_pages = 1ULL << order;
if (tt->dma_address)
ttm_pool_unmap(pool, tt->dma_address[i], num_pages);
pt = ttm_pool_select_type(pool, tt->caching, order);
if (pt)
ttm_pool_type_give(pt, tt->pages[i]);
else
ttm_pool_free_page(pool, tt->caching, order,
tt->pages[i]);
i += num_pages;
}
ttm_pool_free_range(pool, tt, tt->caching, 0, tt->num_pages);
while (atomic_long_read(&allocated_pages) > page_pool_size)
ttm_pool_shrink();