void nvmap_kunmap(struct nvmap_handle_ref *ref, unsigned int pagenum,
void *addr)
{
struct nvmap_handle *h;
phys_addr_t paddr;
pte_t **pte;
BUG_ON(!addr || !ref);
h = ref->handle;
if (nvmap_find_cache_maint_op(h->dev, h)) {
struct nvmap_share *share = nvmap_get_share_from_dev(h->dev);
/* acquire pin lock to ensure maintenance is done before
* handle is pinned */
mutex_lock(&share->pin_lock);
nvmap_cache_maint_ops_flush(h->dev, h);
mutex_unlock(&share->pin_lock);
}
if (h->heap_pgalloc)
paddr = page_to_phys(h->pgalloc.pages[pagenum]);
else
paddr = h->carveout->base + pagenum * PAGE_SIZE;
if (h->flags != NVMAP_HANDLE_UNCACHEABLE &&
h->flags != NVMAP_HANDLE_WRITE_COMBINE) {
dmac_flush_range(addr, addr + PAGE_SIZE);
outer_flush_range(paddr, paddr + PAGE_SIZE);
}
pte = nvmap_vaddr_to_pte(nvmap_dev, (unsigned long)addr);
nvmap_free_pte(nvmap_dev, pte);
nvmap_handle_put(h);
}
static int nvmap_page_pool_get_unused_pages(void)
{
unsigned int i;
int total = 0;
struct nvmap_share *share = nvmap_get_share_from_dev(nvmap_dev);
for (i = 0; i < NVMAP_NUM_POOLS; i++)
total += nvmap_page_pool_get_available_count(&share->pools[i]);
return total;
}
void nvmap_munmap(struct nvmap_handle_ref *ref, void *addr)
{
struct nvmap_handle *h;
if (!ref)
return;
h = ref->handle;
if (nvmap_find_cache_maint_op(h->dev, h)) {
struct nvmap_share *share = nvmap_get_share_from_dev(h->dev);
/* acquire pin lock to ensure maintenance is done before
* handle is pinned */
mutex_lock(&share->pin_lock);
nvmap_cache_maint_ops_flush(h->dev, h);
mutex_unlock(&share->pin_lock);
}
/* Handle can be locked by cache maintenance in
* separate thread */
if (h->heap_pgalloc) {
vm_unmap_ram(addr, h->size >> PAGE_SHIFT);
} else {
static int nvmap_page_pool_shrink(struct shrinker *shrinker,
struct shrink_control *sc)
{
unsigned int i;
unsigned int pool_offset;
struct nvmap_page_pool *pool;
int shrink_pages = sc->nr_to_scan;
static atomic_t start_pool = ATOMIC_INIT(-1);
struct nvmap_share *share = nvmap_get_share_from_dev(nvmap_dev);
if (!shrink_pages)
goto out;
pr_debug("sh_pages=%d", shrink_pages);
for (i = 0; i < NVMAP_NUM_POOLS && shrink_pages; i++) {
pool_offset = atomic_add_return(1, &start_pool) %
NVMAP_NUM_POOLS;
pool = &share->pools[pool_offset];
shrink_pages = nvmap_page_pool_free(pool, shrink_pages);
}
out:
return nvmap_page_pool_get_unused_pages();
}
