From 4c6c9aa6cbb0574c96635f3e4e1c5791e8fafca7 Mon Sep 17 00:00:00 2001 From: Harish Chegondi Date: Mon, 21 Aug 2017 18:27:03 -0700 Subject: [PATCH] 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 Signed-off-by: Harish Chegondi Signed-off-by: Dennis Dalessandro Signed-off-by: Doug Ledford --- drivers/infiniband/hw/hfi1/user_sdma.c | 79 +++++++++++++++----------- 1 file changed, 45 insertions(+), 34 deletions(-) diff --git a/drivers/infiniband/hw/hfi1/user_sdma.c b/drivers/infiniband/hw/hfi1/user_sdma.c index d5a2572cc5a16..6f26253d2b7a2 100644 --- a/drivers/infiniband/hw/hfi1/user_sdma.c +++ b/drivers/infiniband/hw/hfi1/user_sdma.c @@ -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; -- 2.39.5