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diff --git a/sys/compat/linuxkpi/common/include/linux/highmem.h b/sys/compat/linuxkpi/common/include/linux/highmem.h
new file mode 100644
--- /dev/null
+++ b/sys/compat/linuxkpi/common/include/linux/highmem.h
@@ -0,0 +1,118 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
+ * Copyright (c) 2010 Isilon Systems, Inc.
+ * Copyright (c) 2016 Matthew Macy (mmacy@mattmacy.io)
+ * Copyright (c) 2017 Mellanox Technologies, Ltd.
+ * Copyright (c) 2021 Vladimir Kondratyev <wulf@FreeBSD.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#ifndef _LINUX_HIGHMEM_H_
+#define _LINUX_HIGHMEM_H_
+
+#include <sys/types.h>
+#include <sys/lock.h>
+#include <sys/mutex.h>
+#include <sys/proc.h>
+#include <sys/sched.h>
+#include <sys/sf_buf.h>
+
+#include <vm/vm.h>
+#include <vm/vm_page.h>
+#include <vm/pmap.h>
+
+#include <linux/page.h>
+
+#define PageHighMem(p) (0)
+
+static inline vm_page_t
+kmap_to_page(void *addr)
+{
+ return (virt_to_page(addr));
+}
+
+static inline void *
+kmap(vm_page_t page)
+{
+ struct sf_buf *sf;
+
+ if (PMAP_HAS_DMAP) {
+ return ((void *)PHYS_TO_DMAP(VM_PAGE_TO_PHYS(page)));
+ } else {
+ sched_pin();
+ sf = sf_buf_alloc(page, SFB_NOWAIT | SFB_CPUPRIVATE);
+ if (sf == NULL) {
+ sched_unpin();
+ return (NULL);
+ }
+ return ((void *)sf_buf_kva(sf));
+ }
+}
+
+static inline void *
+kmap_atomic_prot(vm_page_t page, pgprot_t prot)
+{
+ vm_memattr_t attr = pgprot2cachemode(prot);
+
+ if (attr != VM_MEMATTR_DEFAULT) {
+ vm_page_lock(page);
+ page->flags |= PG_FICTITIOUS;
+ vm_page_unlock(page);
+ pmap_page_set_memattr(page, attr);
+ }
+ return (kmap(page));
+}
+
+static inline void *
+kmap_atomic(vm_page_t page)
+{
+ return (kmap_atomic_prot(page, VM_PROT_ALL));
+}
+
+static inline void
+kunmap(vm_page_t page)
+{
+ struct sf_buf *sf;
+
+ if (!PMAP_HAS_DMAP) {
+ /* lookup SF buffer in list */
+ sf = sf_buf_alloc(page, SFB_NOWAIT | SFB_CPUPRIVATE);
+
+ /* double-free */
+ sf_buf_free(sf);
+ sf_buf_free(sf);
+
+ sched_unpin();
+ }
+}
+
+static inline void
+kunmap_atomic(void *vaddr)
+{
+ if (!PMAP_HAS_DMAP)
+ kunmap(virt_to_page(vaddr));
+}
+
+#endif /* _LINUX_HIGHMEM_H_ */
diff --git a/sys/compat/linuxkpi/common/include/linux/mm.h b/sys/compat/linuxkpi/common/include/linux/mm.h
--- a/sys/compat/linuxkpi/common/include/linux/mm.h
+++ b/sys/compat/linuxkpi/common/include/linux/mm.h
@@ -290,4 +290,8 @@
extern int is_vmalloc_addr(const void *addr);
void si_meminfo(struct sysinfo *si);
+#define unmap_mapping_range(...) lkpi_unmap_mapping_range(__VA_ARGS__)
+void lkpi_unmap_mapping_range(void *obj, loff_t const holebegin __unused,
+ loff_t const holelen, int even_cows __unused);
+
#endif /* _LINUX_MM_H_ */
diff --git a/sys/compat/linuxkpi/common/include/linux/page.h b/sys/compat/linuxkpi/common/include/linux/page.h
--- a/sys/compat/linuxkpi/common/include/linux/page.h
+++ b/sys/compat/linuxkpi/common/include/linux/page.h
@@ -41,6 +41,10 @@
#include <vm/vm_page.h>
#include <vm/pmap.h>
+#if defined(__i386__) || defined(__amd64__)
+#include <machine/md_var.h>
+#endif
+
typedef unsigned long linux_pte_t;
typedef unsigned long linux_pmd_t;
typedef unsigned long linux_pgd_t;
@@ -53,6 +57,8 @@
CTASSERT((VM_PROT_ALL & -LINUXKPI_PROT_VALID) == 0);
+#define PAGE_KERNEL_IO 0x0000
+
static inline pgprot_t
cachemode2protval(vm_memattr_t attr)
{
@@ -72,6 +78,7 @@
#define page_to_pfn(pp) (VM_PAGE_TO_PHYS(pp) >> PAGE_SHIFT)
#define pfn_to_page(pfn) (PHYS_TO_VM_PAGE((pfn) << PAGE_SHIFT))
#define nth_page(page,n) pfn_to_page(page_to_pfn(page) + (n))
+#define page_to_phys(page) VM_PAGE_TO_PHYS(page)
#define clear_page(page) memset(page, 0, PAGE_SIZE)
#define pgprot_noncached(prot) \
@@ -93,4 +100,19 @@
#undef trunc_page
#define trunc_page(x) ((uintptr_t)(x) & ~(PAGE_SIZE - 1))
+#if defined(__i386__) || defined(__amd64__)
+#undef clflushopt
+static inline void
+lkpi_clflushopt(unsigned long addr)
+{
+ if (cpu_stdext_feature & CPUID_STDEXT_CLFLUSHOPT)
+ clflushopt(addr);
+ else if (cpu_feature & CPUID_CLFSH)
+ clflush(addr);
+ else
+ pmap_invalidate_cache();
+}
+#define clflushopt(x) lkpi_clflushopt((unsigned long)(x))
+#endif
+
#endif /* _LINUX_PAGE_H_ */
diff --git a/sys/compat/linuxkpi/common/include/linux/scatterlist.h b/sys/compat/linuxkpi/common/include/linux/scatterlist.h
--- a/sys/compat/linuxkpi/common/include/linux/scatterlist.h
+++ b/sys/compat/linuxkpi/common/include/linux/scatterlist.h
@@ -4,6 +4,7 @@
* Copyright (c) 2010 Panasas, Inc.
* Copyright (c) 2013-2017 Mellanox Technologies, Ltd.
* Copyright (c) 2015 Matthew Dillon <dillon@backplane.com>
+ * Copyright (c) 2016 Matthew Macy
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
@@ -534,4 +535,61 @@
return (copied);
}
+static inline size_t
+sg_copy_from_buffer(struct scatterlist *sgl, unsigned int nents,
+ const void *buf, size_t buflen)
+{
+ return (sg_pcopy_from_buffer(sgl, nents, buf, buflen, 0));
+}
+
+static inline size_t
+sg_pcopy_to_buffer(struct scatterlist *sgl, unsigned int nents,
+ void *buf, size_t buflen, off_t offset)
+{
+ struct sg_page_iter iter;
+ struct scatterlist *sg;
+ struct page *page;
+ struct sf_buf *sf;
+ char *vaddr;
+ size_t total = 0;
+ size_t len;
+
+ if (!PMAP_HAS_DMAP)
+ sched_pin();
+ for_each_sg_page(sgl, &iter, nents, 0) {
+ sg = iter.sg;
+
+ if (offset >= sg->length) {
+ offset -= sg->length;
+ continue;
+ }
+ len = ulmin(buflen, sg->length - offset);
+ if (len == 0)
+ break;
+
+ page = sg_page_iter_page(&iter);
+ if (!PMAP_HAS_DMAP) {
+ sf = sf_buf_alloc(page, SFB_CPUPRIVATE | SFB_NOWAIT);
+ if (sf == NULL)
+ break;
+ vaddr = (char *)sf_buf_kva(sf);
+ } else
+ vaddr = (char *)PHYS_TO_DMAP(VM_PAGE_TO_PHYS(page));
+ memcpy(buf, vaddr + sg->offset + offset, len);
+ if (!PMAP_HAS_DMAP)
+ sf_buf_free(sf);
+
+ /* start at beginning of next page */
+ offset = 0;
+
+ /* advance buffer */
+ buf = (char *)buf + len;
+ buflen -= len;
+ total += len;
+ }
+ if (!PMAP_HAS_DMAP)
+ sched_unpin();
+ return (total);
+}
+
#endif /* _LINUX_SCATTERLIST_H_ */
diff --git a/sys/compat/linuxkpi/common/src/linux_page.c b/sys/compat/linuxkpi/common/src/linux_page.c
--- a/sys/compat/linuxkpi/common/src/linux_page.c
+++ b/sys/compat/linuxkpi/common/src/linux_page.c
@@ -334,3 +334,37 @@
return (VM_FAULT_NOPAGE);
}
+
+/*
+ * Although FreeBSD version of unmap_mapping_range has semantics and types of
+ * parameters compatible with Linux version, the values passed in are different
+ * @obj should match to vm_private_data field of vm_area_struct returned by
+ * mmap file operation handler, see linux_file_mmap_single() sources
+ * @holelen should match to size of area to be munmapped.
+ */
+void
+lkpi_unmap_mapping_range(void *obj, loff_t const holebegin __unused,
+ loff_t const holelen, int even_cows __unused)
+{
+ vm_object_t devobj;
+ vm_page_t page;
+ int i, page_count;
+
+ devobj = cdev_pager_lookup(obj);
+ if (devobj != NULL) {
+ page_count = OFF_TO_IDX(holelen);
+
+ VM_OBJECT_WLOCK(devobj);
+retry:
+ for (i = 0; i < page_count; i++) {
+ page = vm_page_lookup(devobj, i);
+ if (page == NULL)
+ continue;
+ if (!vm_page_busy_acquire(page, VM_ALLOC_WAITFAIL))
+ goto retry;
+ cdev_pager_free_page(devobj, page);
+ }
+ VM_OBJECT_WUNLOCK(devobj);
+ vm_object_deallocate(devobj);
+ }
+}

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