/*Allocate pages which will be used only by ISP*/
static int alloc_private_pages(struct hmm_buffer_object *bo, int from_highmem,
bool cached, struct hmm_pool *dypool,
struct hmm_pool *repool)
{
int ret;
unsigned int pgnr, order, blk_pgnr, alloc_pgnr;
struct page *pages;
gfp_t gfp = GFP_NOWAIT | __GFP_NOWARN; /* REVISIT: need __GFP_FS too? */
int i, j;
int failure_number = 0;
bool reduce_order = false;
bool lack_mem = true;
if (from_highmem)
gfp |= __GFP_HIGHMEM;
pgnr = bo->pgnr;
bo->page_obj = atomisp_kernel_malloc(
sizeof(struct hmm_page_object) * pgnr);
if (unlikely(!bo->page_obj)) {
dev_err(atomisp_dev, "out of memory for bo->page_obj\n");
return -ENOMEM;
}
i = 0;
alloc_pgnr = 0;
/*
* get physical pages from dynamic pages pool.
*/
if (dypool->pops && dypool->pops->pool_alloc_pages) {
alloc_pgnr = dypool->pops->pool_alloc_pages(dypool->pool_info,
bo->page_obj, pgnr,
cached);
hmm_mem_stat.dyc_size -= alloc_pgnr;
if (alloc_pgnr == pgnr)
return 0;
}
pgnr -= alloc_pgnr;
i += alloc_pgnr;
/*
* get physical pages from reserved pages pool for atomisp.
*/
if (repool->pops && repool->pops->pool_alloc_pages) {
alloc_pgnr = repool->pops->pool_alloc_pages(repool->pool_info,
&bo->page_obj[i], pgnr,
cached);
hmm_mem_stat.res_cnt += alloc_pgnr;
if (alloc_pgnr == pgnr)
return 0;
}
pgnr -= alloc_pgnr;
i += alloc_pgnr;
while (pgnr) {
order = nr_to_order_bottom(pgnr);
/*
* if be short of memory, we will set order to 0
* everytime.
*/
if (lack_mem)
order = HMM_MIN_ORDER;
else if (order > HMM_MAX_ORDER)
order = HMM_MAX_ORDER;
retry:
/*
* When order > HMM_MIN_ORDER, for performance reasons we don't
* want alloc_pages() to sleep. In case it fails and fallbacks
* to HMM_MIN_ORDER or in case the requested order is originally
* the minimum value, we can allow alloc_pages() to sleep for
* robustness purpose.
*
* REVISIT: why __GFP_FS is necessary?
*/
if (order == HMM_MIN_ORDER) {
gfp &= ~GFP_NOWAIT;
gfp |= __GFP_WAIT | __GFP_FS;
}
pages = alloc_pages(gfp, order);
if (unlikely(!pages)) {
/*
* in low memory case, if allocation page fails,
* we turn to try if order=0 allocation could
* succeed. if order=0 fails too, that means there is
* no memory left.
*/
if (order == HMM_MIN_ORDER) {
dev_err(atomisp_dev,
"%s: cannot allocate pages\n",
__func__);
goto cleanup;
}
order = HMM_MIN_ORDER;
failure_number++;
reduce_order = true;
/*
* if fail two times continuously, we think be short
* of memory now.
*/
if (failure_number == 2) {
lack_mem = true;
failure_number = 0;
}
goto retry;
} else {
blk_pgnr = order_to_nr(order);
if (!cached) {
/*
* set memory to uncacheable -- UC_MINUS
*/
ret = set_pages_uc(pages, blk_pgnr);
if (ret) {
dev_err(atomisp_dev,
"set page uncacheable"
"failed.\n");
__free_pages(pages, order);
goto cleanup;
}
}
for (j = 0; j < blk_pgnr; j++) {
bo->page_obj[i].page = pages + j;
bo->page_obj[i++].type = HMM_PAGE_TYPE_GENERAL;
}
pgnr -= blk_pgnr;
hmm_mem_stat.sys_size += blk_pgnr;
/*
* if order is not reduced this time, clear
* failure_number.
*/
if (reduce_order)
reduce_order = false;
else
failure_number = 0;
}
}
return 0;
cleanup:
alloc_pgnr = i;
free_private_bo_pages(bo, dypool, repool, alloc_pgnr);
atomisp_kernel_free(bo->page_obj);
return -ENOMEM;
}
/*Allocate pages which will be used only by ISP*/
static int alloc_private_pages(struct hmm_buffer_object *bo, int from_highmem,
bool cached)
{
int ret;
unsigned int pgnr, order, blk_pgnr;
struct page *pages;
struct page_block *pgblk;
gfp_t gfp = GFP_NOWAIT | __GFP_NOWARN; /* REVISIT: need __GFP_FS too? */
int i, j;
int failure_number = 0;
bool reduce_order = false;
bool lack_mem = true;
if (from_highmem)
gfp |= __GFP_HIGHMEM;
pgnr = bo->pgnr;
bo->pages = atomisp_kernel_malloc(sizeof(struct page *) * pgnr);
if (unlikely(!bo->pages)) {
v4l2_err(&atomisp_dev, "out of memory for bo->pages\n");
return -ENOMEM;
}
i = 0;
while (pgnr) {
order = nr_to_order_bottom(pgnr);
/*
* if be short of memory, we will set order to 0
* everytime.
*/
if (lack_mem)
order = HMM_MIN_ORDER;
else if (order > HMM_MAX_ORDER)
order = HMM_MAX_ORDER;
retry:
/*
* When order > HMM_MIN_ORDER, for performance reasons we don't
* want alloc_pages() to sleep. In case it fails and fallbacks
* to HMM_MIN_ORDER or in case the requested order is originally
* the minimum value, we can allow alloc_pages() to sleep for
* robustness purpose.
*
* REVISIT: why __GFP_FS is necessary?
*/
if (order == HMM_MIN_ORDER) {
gfp &= ~GFP_NOWAIT;
gfp |= __GFP_WAIT | __GFP_FS;
}
pages = alloc_pages(gfp, order);
if (unlikely(!pages)) {
/*
* in low memory case, if allocation page fails,
* we turn to try if order=0 allocation could
* succeed. if order=0 fails too, that means there is
* no memory left.
*/
if (order == HMM_MIN_ORDER) {
v4l2_err(&atomisp_dev,
"%s: cannot allocate pages\n",
__func__);
goto cleanup;
}
order = HMM_MIN_ORDER;
failure_number++;
reduce_order = true;
/*
* if fail two times continuously, we think be short
* of memory now.
*/
if (failure_number == 2) {
lack_mem = true;
failure_number = 0;
}
goto retry;
} else {
blk_pgnr = order_to_nr(order);
pgblk = kzalloc(sizeof(*pgblk), GFP_KERNEL);
if (unlikely(!pgblk)) {
v4l2_err(&atomisp_dev,
"out of memory for pgblk\n");
goto out_of_mem;
}
INIT_LIST_HEAD(&pgblk->list);
pgblk->pages = pages;
pgblk->order = order;
list_add_tail(&pgblk->list, &bo->pgblocks);
for (j = 0; j < blk_pgnr; j++)
bo->pages[i++] = pages + j;
pgnr -= blk_pgnr;
if (!cached) {
/*
* set memory to uncacheable -- UC_MINUS
*/
ret = set_pages_uc(pages, blk_pgnr);
if (ret) {
v4l2_err(&atomisp_dev,
"set page uncacheable"
"failed.\n");
goto cleanup;
}
}
/*
* if order is not reduced this time, clear
* failure_number.
*/
if (reduce_order)
reduce_order = false;
else
failure_number = 0;
}
}
return 0;
out_of_mem:
__free_pages(pages, order);
cleanup:
while (!list_empty(&bo->pgblocks)) {
pgblk = list_first_entry(&bo->pgblocks,
struct page_block, list);
list_del(&pgblk->list);
ret = set_pages_wb(pgblk->pages, order_to_nr(pgblk->order));
if (ret)
v4l2_err(&atomisp_dev,
"set page to WB err...\n");
__free_pages(pgblk->pages, pgblk->order);
kfree(pgblk);
}
atomisp_kernel_free(bo->pages);
return -ENOMEM;
}