Hi all: TTM provide "ttm_bo_type_user" which create bo from user space memory.
I try to use this functions, but find some problems: 1. Can not get "pages" when driver try to bind user pages to GPU apterure. ttm->state set to "tt_unbound" when add ttm structs, while ttm_tt_populate prevent driver populate function called if ttm->state is not "tt_unpopulated"
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;
2. Page number may not be the size it rounded up. eg. supports allocate a user space BO size=5K, which round up to 2 pages,but it should be 3, if the user space memory like this
page1 page2 page3 _______________________ |_____|_____|_____|_____| |<-------->| 5k
Thanks april