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-rw-r--r--tools/testing/nvdimm/pmem-dax.c51
1 files changed, 51 insertions, 0 deletions
diff --git a/tools/testing/nvdimm/pmem-dax.c b/tools/testing/nvdimm/pmem-dax.c
new file mode 100644
index 0000000000..c1ec099a3b
--- /dev/null
+++ b/tools/testing/nvdimm/pmem-dax.c
@@ -0,0 +1,51 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2014-2016, Intel Corporation.
+ */
+#include "test/nfit_test.h"
+#include <linux/blkdev.h>
+#include <linux/dax.h>
+#include <pmem.h>
+#include <nd.h>
+
+long __pmem_direct_access(struct pmem_device *pmem, pgoff_t pgoff,
+ long nr_pages, enum dax_access_mode mode, void **kaddr,
+ pfn_t *pfn)
+{
+ resource_size_t offset = PFN_PHYS(pgoff) + pmem->data_offset;
+
+ if (unlikely(is_bad_pmem(&pmem->bb, PFN_PHYS(pgoff) / 512,
+ PFN_PHYS(nr_pages))))
+ return -EIO;
+
+ /*
+ * Limit dax to a single page at a time given vmalloc()-backed
+ * in the nfit_test case.
+ */
+ if (get_nfit_res(pmem->phys_addr + offset)) {
+ struct page *page;
+
+ if (kaddr)
+ *kaddr = pmem->virt_addr + offset;
+ page = vmalloc_to_page(pmem->virt_addr + offset);
+ if (pfn)
+ *pfn = page_to_pfn_t(page);
+ pr_debug_ratelimited("%s: pmem: %p pgoff: %#lx pfn: %#lx\n",
+ __func__, pmem, pgoff, page_to_pfn(page));
+
+ return 1;
+ }
+
+ if (kaddr)
+ *kaddr = pmem->virt_addr + offset;
+ if (pfn)
+ *pfn = phys_to_pfn_t(pmem->phys_addr + offset, pmem->pfn_flags);
+
+ /*
+ * If badblocks are present, limit known good range to the
+ * requested range.
+ */
+ if (unlikely(pmem->bb.count))
+ return nr_pages;
+ return PHYS_PFN(pmem->size - pmem->pfn_pad - offset);
+}