2012/3/19 Scott Fang <donnie.fang@xxxxxxxxx>
In function ttm_tt_set_caching
,,,,,,,
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,
ttm->caching_state,
c_state);
if (unlikely(ret != 0))
goto out_err;
}
}
ttm->caching_state = c_state;
return 0;
drm_clflush_pages flush cache one time.
then in the following function ttm_tt_set_page_caching->set_memory_wc->change_page_attr_set: in this function may flush page cache again.
Does the code do some redundant flush, or there is some trick to these codes?
Thanks for the answer in advance.
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