From: John Hubbard <jhubbard@xxxxxxxxxx> For code that retains pages via get_user_pages*(), release those pages via the new put_user_page(), or put_user_pages*(), instead of put_page() This prepares for eventually fixing the problem described in [1], and is following a plan listed in [2], [3], [4]. [1] https://lwn.net/Articles/753027/ : "The Trouble with get_user_pages()" [2] https://lkml.kernel.org/r/20180709080554.21931-1-jhubbard@xxxxxxxxxx Proposed steps for fixing get_user_pages() + DMA problems. [3]https://lkml.kernel.org/r/20180710082100.mkdwngdv5kkrcz6n@xxxxxxxxxxxxxx Bounce buffers (otherwise [2] is not really viable). [4] https://lkml.kernel.org/r/20181003162115.GG24030@xxxxxxxxxxxxxx Follow-up discussions. CC: Doug Ledford <dledford@xxxxxxxxxx> CC: Jason Gunthorpe <jgg@xxxxxxxx> CC: Mike Marciniszyn <mike.marciniszyn@xxxxxxxxx> CC: Dennis Dalessandro <dennis.dalessandro@xxxxxxxxx> CC: Christian Benvenuti <benve@xxxxxxxxx> CC: linux-rdma@xxxxxxxxxxxxxxx CC: linux-kernel@xxxxxxxxxxxxxxx CC: linux-mm@xxxxxxxxx Signed-off-by: John Hubbard <jhubbard@xxxxxxxxxx> --- drivers/infiniband/core/umem.c | 7 ++++--- drivers/infiniband/core/umem_odp.c | 2 +- drivers/infiniband/hw/hfi1/user_pages.c | 11 ++++------- drivers/infiniband/hw/mthca/mthca_memfree.c | 6 +++--- drivers/infiniband/hw/qib/qib_user_pages.c | 11 ++++------- drivers/infiniband/hw/qib/qib_user_sdma.c | 8 ++++---- drivers/infiniband/hw/usnic/usnic_uiom.c | 7 ++++--- 7 files changed, 24 insertions(+), 28 deletions(-) diff --git a/drivers/infiniband/core/umem.c b/drivers/infiniband/core/umem.c index a41792dbae1f..7ab7a3a35eb4 100644 --- a/drivers/infiniband/core/umem.c +++ b/drivers/infiniband/core/umem.c @@ -58,9 +58,10 @@ static void __ib_umem_release(struct ib_device *dev, struct ib_umem *umem, int d for_each_sg(umem->sg_head.sgl, sg, umem->npages, i) { page = sg_page(sg); - if (!PageDirty(page) && umem->writable && dirty) - set_page_dirty_lock(page); - put_page(page); + if (umem->writable && dirty) + put_user_pages_dirty_lock(&page, 1); + else + put_user_page(page); } sg_free_table(&umem->sg_head); diff --git a/drivers/infiniband/core/umem_odp.c b/drivers/infiniband/core/umem_odp.c index 6ec748eccff7..6227b89cf05c 100644 --- a/drivers/infiniband/core/umem_odp.c +++ b/drivers/infiniband/core/umem_odp.c @@ -717,7 +717,7 @@ int ib_umem_odp_map_dma_pages(struct ib_umem *umem, u64 user_virt, u64 bcnt, ret = -EFAULT; break; } - put_page(local_page_list[j]); + put_user_page(local_page_list[j]); continue; } diff --git a/drivers/infiniband/hw/hfi1/user_pages.c b/drivers/infiniband/hw/hfi1/user_pages.c index e341e6dcc388..99ccc0483711 100644 --- a/drivers/infiniband/hw/hfi1/user_pages.c +++ b/drivers/infiniband/hw/hfi1/user_pages.c @@ -121,13 +121,10 @@ int hfi1_acquire_user_pages(struct mm_struct *mm, unsigned long vaddr, size_t np void hfi1_release_user_pages(struct mm_struct *mm, struct page **p, size_t npages, bool dirty) { - size_t i; - - for (i = 0; i < npages; i++) { - if (dirty) - set_page_dirty_lock(p[i]); - put_page(p[i]); - } + if (dirty) + put_user_pages_dirty_lock(p, npages); + else + put_user_pages(p, npages); if (mm) { /* during close after signal, mm can be NULL */ down_write(&mm->mmap_sem); diff --git a/drivers/infiniband/hw/mthca/mthca_memfree.c b/drivers/infiniband/hw/mthca/mthca_memfree.c index cc9c0c8ccba3..b8b12effd009 100644 --- a/drivers/infiniband/hw/mthca/mthca_memfree.c +++ b/drivers/infiniband/hw/mthca/mthca_memfree.c @@ -481,7 +481,7 @@ int mthca_map_user_db(struct mthca_dev *dev, struct mthca_uar *uar, ret = pci_map_sg(dev->pdev, &db_tab->page[i].mem, 1, PCI_DMA_TODEVICE); if (ret < 0) { - put_page(pages[0]); + put_user_page(pages[0]); goto out; } @@ -489,7 +489,7 @@ int mthca_map_user_db(struct mthca_dev *dev, struct mthca_uar *uar, mthca_uarc_virt(dev, uar, i)); if (ret) { pci_unmap_sg(dev->pdev, &db_tab->page[i].mem, 1, PCI_DMA_TODEVICE); - put_page(sg_page(&db_tab->page[i].mem)); + put_user_page(sg_page(&db_tab->page[i].mem)); goto out; } @@ -555,7 +555,7 @@ void mthca_cleanup_user_db_tab(struct mthca_dev *dev, struct mthca_uar *uar, if (db_tab->page[i].uvirt) { mthca_UNMAP_ICM(dev, mthca_uarc_virt(dev, uar, i), 1); pci_unmap_sg(dev->pdev, &db_tab->page[i].mem, 1, PCI_DMA_TODEVICE); - put_page(sg_page(&db_tab->page[i].mem)); + put_user_page(sg_page(&db_tab->page[i].mem)); } } diff --git a/drivers/infiniband/hw/qib/qib_user_pages.c b/drivers/infiniband/hw/qib/qib_user_pages.c index 16543d5e80c3..1a5c64c8695f 100644 --- a/drivers/infiniband/hw/qib/qib_user_pages.c +++ b/drivers/infiniband/hw/qib/qib_user_pages.c @@ -40,13 +40,10 @@ static void __qib_release_user_pages(struct page **p, size_t num_pages, int dirty) { - size_t i; - - for (i = 0; i < num_pages; i++) { - if (dirty) - set_page_dirty_lock(p[i]); - put_page(p[i]); - } + if (dirty) + put_user_pages_dirty_lock(p, num_pages); + else + put_user_pages(p, num_pages); } /* diff --git a/drivers/infiniband/hw/qib/qib_user_sdma.c b/drivers/infiniband/hw/qib/qib_user_sdma.c index 926f3c8eba69..14f94d823907 100644 --- a/drivers/infiniband/hw/qib/qib_user_sdma.c +++ b/drivers/infiniband/hw/qib/qib_user_sdma.c @@ -266,7 +266,7 @@ static void qib_user_sdma_init_frag(struct qib_user_sdma_pkt *pkt, pkt->addr[i].length = len; pkt->addr[i].first_desc = first_desc; pkt->addr[i].last_desc = last_desc; - pkt->addr[i].put_page = put_page; + pkt->addr[i].put_page = put_user_page; pkt->addr[i].dma_mapped = dma_mapped; pkt->addr[i].page = page; pkt->addr[i].kvaddr = kvaddr; @@ -321,7 +321,7 @@ static int qib_user_sdma_page_to_frags(const struct qib_devdata *dd, * the caller can ignore this page. */ if (put) { - put_page(page); + put_user_page(page); } else { /* coalesce case */ kunmap(page); @@ -635,7 +635,7 @@ static void qib_user_sdma_free_pkt_frag(struct device *dev, kunmap(pkt->addr[i].page); if (pkt->addr[i].put_page) - put_page(pkt->addr[i].page); + put_user_page(pkt->addr[i].page); else __free_page(pkt->addr[i].page); } else if (pkt->addr[i].kvaddr) { @@ -710,7 +710,7 @@ static int qib_user_sdma_pin_pages(const struct qib_devdata *dd, /* if error, return all pages not managed by pkt */ free_pages: while (i < j) - put_page(pages[i++]); + put_user_page(pages[i++]); done: return ret; diff --git a/drivers/infiniband/hw/usnic/usnic_uiom.c b/drivers/infiniband/hw/usnic/usnic_uiom.c index 9dd39daa602b..9e3615fd05f7 100644 --- a/drivers/infiniband/hw/usnic/usnic_uiom.c +++ b/drivers/infiniband/hw/usnic/usnic_uiom.c @@ -89,9 +89,10 @@ static void usnic_uiom_put_pages(struct list_head *chunk_list, int dirty) for_each_sg(chunk->page_list, sg, chunk->nents, i) { page = sg_page(sg); pa = sg_phys(sg); - if (!PageDirty(page) && dirty) - set_page_dirty_lock(page); - put_page(page); + if (dirty) + put_user_pages_dirty_lock(&page, 1); + else + put_user_page(page); usnic_dbg("pa: %pa\n", &pa); } kfree(chunk); -- 2.19.0
