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IB/hfi1: Clean up pin_vector_pages() function 

Clean up pin_vector_pages() function by moving page pinning related code
to a separate function since it really stands on its own.

Reviewed-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Harish Chegondi <harish.chegondi@intel.com>
Signed-off-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
zero-colors
Harish Chegondi 2017-08-21 18:27:03 -07:00 committed by Doug Ledford
parent 624b9ac15c
commit 4c6c9aa6cb
1 changed files with 45 additions and 34 deletions
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79
drivers/infiniband/hw/hfi1/user_sdma.c
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@ -1124,11 +1124,53 @@ static u32 sdma_cache_evict(struct hfi1_user_sdma_pkt_q *pq, u32 npages)
return evict_data.cleared;
}
static int pin_sdma_pages(struct user_sdma_request *req,
struct user_sdma_iovec *iovec,
struct sdma_mmu_node *node,
int npages)
{
int pinned, cleared;
struct page **pages;
struct hfi1_user_sdma_pkt_q *pq = req->pq;
pages = kcalloc(npages, sizeof(*pages), GFP_KERNEL);
if (!pages) {
SDMA_DBG(req, "Failed page array alloc");
return -ENOMEM;
}
memcpy(pages, node->pages, node->npages * sizeof(*pages));
npages -= node->npages;
retry:
if (!hfi1_can_pin_pages(pq->dd, pq->mm,
atomic_read(&pq->n_locked), npages)) {
cleared = sdma_cache_evict(pq, npages);
if (cleared >= npages)
goto retry;
}
pinned = hfi1_acquire_user_pages(pq->mm,
((unsigned long)iovec->iov.iov_base +
(node->npages * PAGE_SIZE)), npages, 0,
pages + node->npages);
if (pinned < 0) {
kfree(pages);
return pinned;
}
if (pinned != npages) {
unpin_vector_pages(pq->mm, pages, node->npages, pinned);
return -EFAULT;
}
kfree(node->pages);
node->rb.len = iovec->iov.iov_len;
node->pages = pages;
atomic_add(pinned, &pq->n_locked);
return pinned;
}
static int pin_vector_pages(struct user_sdma_request *req,
struct user_sdma_iovec *iovec)
{
int ret = 0, pinned, npages, cleared;
struct page **pages;
int ret = 0, pinned, npages;
struct hfi1_user_sdma_pkt_q *pq = req->pq;
struct sdma_mmu_node *node = NULL;
struct mmu_rb_node *rb_node;
@ -1162,44 +1204,13 @@ static int pin_vector_pages(struct user_sdma_request *req,
npages = num_user_pages(&iovec->iov);
if (node->npages < npages) {
pages = kcalloc(npages, sizeof(*pages), GFP_KERNEL);
if (!pages) {
SDMA_DBG(req, "Failed page array alloc");
ret = -ENOMEM;
goto bail;
}
memcpy(pages, node->pages, node->npages * sizeof(*pages));
npages -= node->npages;
retry:
if (!hfi1_can_pin_pages(pq->dd, pq->mm,
atomic_read(&pq->n_locked), npages)) {
cleared = sdma_cache_evict(pq, npages);
if (cleared >= npages)
goto retry;
}
pinned = hfi1_acquire_user_pages(pq->mm,
((unsigned long)iovec->iov.iov_base +
(node->npages * PAGE_SIZE)), npages, 0,
pages + node->npages);
pinned = pin_sdma_pages(req, iovec, node, npages);
if (pinned < 0) {
kfree(pages);
ret = pinned;
goto bail;
}
if (pinned != npages) {
unpin_vector_pages(pq->mm, pages, node->npages,
pinned);
ret = -EFAULT;
goto bail;
}
kfree(node->pages);
node->rb.len = iovec->iov.iov_len;
node->pages = pages;
node->npages += pinned;
npages = node->npages;
atomic_add(pinned, &pq->n_locked);
}
iovec->pages = node->pages;
iovec->npages = npages;