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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
commitace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch)
treeb2d64bc10158fdd5497876388cd68142ca374ed3 /drivers/infiniband/hw/qib/qib_user_pages.c
parentInitial commit. (diff)
downloadlinux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz
linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/infiniband/hw/qib/qib_user_pages.c')
-rw-r--r--drivers/infiniband/hw/qib/qib_user_pages.c137
1 files changed, 137 insertions, 0 deletions
diff --git a/drivers/infiniband/hw/qib/qib_user_pages.c b/drivers/infiniband/hw/qib/qib_user_pages.c
new file mode 100644
index 0000000000..1bb7507325
--- /dev/null
+++ b/drivers/infiniband/hw/qib/qib_user_pages.c
@@ -0,0 +1,137 @@
+/*
+ * Copyright (c) 2006, 2007, 2008, 2009 QLogic Corporation. All rights reserved.
+ * Copyright (c) 2003, 2004, 2005, 2006 PathScale, Inc. All rights reserved.
+ *
+ * This software is available to you under a choice of one of two
+ * licenses. You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the
+ * OpenIB.org BSD license below:
+ *
+ * Redistribution and use in source and binary forms, with or
+ * without modification, are permitted provided that the following
+ * conditions are met:
+ *
+ * - Redistributions of source code must retain the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer in the documentation and/or other materials
+ * provided with the distribution.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#include <linux/mm.h>
+#include <linux/sched/signal.h>
+#include <linux/device.h>
+
+#include "qib.h"
+
+static void __qib_release_user_pages(struct page **p, size_t num_pages,
+ int dirty)
+{
+ unpin_user_pages_dirty_lock(p, num_pages, dirty);
+}
+
+/*
+ * qib_map_page - a safety wrapper around pci_map_page()
+ *
+ * A dma_addr of all 0's is interpreted by the chip as "disabled".
+ * Unfortunately, it can also be a valid dma_addr returned on some
+ * architectures.
+ *
+ * The powerpc iommu assigns dma_addrs in ascending order, so we don't
+ * have to bother with retries or mapping a dummy page to insure we
+ * don't just get the same mapping again.
+ *
+ * I'm sure we won't be so lucky with other iommu's, so FIXME.
+ */
+int qib_map_page(struct pci_dev *hwdev, struct page *page, dma_addr_t *daddr)
+{
+ dma_addr_t phys;
+
+ phys = dma_map_page(&hwdev->dev, page, 0, PAGE_SIZE, DMA_FROM_DEVICE);
+ if (dma_mapping_error(&hwdev->dev, phys))
+ return -ENOMEM;
+
+ if (!phys) {
+ dma_unmap_page(&hwdev->dev, phys, PAGE_SIZE, DMA_FROM_DEVICE);
+ phys = dma_map_page(&hwdev->dev, page, 0, PAGE_SIZE,
+ DMA_FROM_DEVICE);
+ if (dma_mapping_error(&hwdev->dev, phys))
+ return -ENOMEM;
+ /*
+ * FIXME: If we get 0 again, we should keep this page,
+ * map another, then free the 0 page.
+ */
+ }
+ *daddr = phys;
+ return 0;
+}
+
+/**
+ * qib_get_user_pages - lock user pages into memory
+ * @start_page: the start page
+ * @num_pages: the number of pages
+ * @p: the output page structures
+ *
+ * This function takes a given start page (page aligned user virtual
+ * address) and pins it and the following specified number of pages. For
+ * now, num_pages is always 1, but that will probably change at some point
+ * (because caller is doing expected sends on a single virtually contiguous
+ * buffer, so we can do all pages at once).
+ */
+int qib_get_user_pages(unsigned long start_page, size_t num_pages,
+ struct page **p)
+{
+ unsigned long locked, lock_limit;
+ size_t got;
+ int ret;
+
+ lock_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT;
+ locked = atomic64_add_return(num_pages, &current->mm->pinned_vm);
+
+ if (locked > lock_limit && !capable(CAP_IPC_LOCK)) {
+ ret = -ENOMEM;
+ goto bail;
+ }
+
+ mmap_read_lock(current->mm);
+ for (got = 0; got < num_pages; got += ret) {
+ ret = pin_user_pages(start_page + got * PAGE_SIZE,
+ num_pages - got,
+ FOLL_LONGTERM | FOLL_WRITE,
+ p + got);
+ if (ret < 0) {
+ mmap_read_unlock(current->mm);
+ goto bail_release;
+ }
+ }
+ mmap_read_unlock(current->mm);
+
+ return 0;
+bail_release:
+ __qib_release_user_pages(p, got, 0);
+bail:
+ atomic64_sub(num_pages, &current->mm->pinned_vm);
+ return ret;
+}
+
+void qib_release_user_pages(struct page **p, size_t num_pages)
+{
+ __qib_release_user_pages(p, num_pages, 1);
+
+ /* during close after signal, mm can be NULL */
+ if (current->mm)
+ atomic64_sub(num_pages, &current->mm->pinned_vm);
+}