+ mm-gup-replace-get_user_pages_longterm-with-foll_longterm.patch added to -mm tree

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



The patch titled
     Subject: mm/gup: replace get_user_pages_longterm() with FOLL_LONGTERM
has been added to the -mm tree.  Its filename is
     mm-gup-replace-get_user_pages_longterm-with-foll_longterm.patch

This patch should soon appear at
    http://ozlabs.org/~akpm/mmots/broken-out/mm-gup-replace-get_user_pages_longterm-with-foll_longterm.patch
and later at
    http://ozlabs.org/~akpm/mmotm/broken-out/mm-gup-replace-get_user_pages_longterm-with-foll_longterm.patch

Before you just go and hit "reply", please:
   a) Consider who else should be cc'ed
   b) Prefer to cc a suitable mailing list as well
   c) Ideally: find the original patch on the mailing list and do a
      reply-to-all to that, adding suitable additional cc's

*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***

The -mm tree is included into linux-next and is updated
there every 3-4 working days

------------------------------------------------------
From: Ira Weiny <ira.weiny@xxxxxxxxx>
Subject: mm/gup: replace get_user_pages_longterm() with FOLL_LONGTERM

Pach series "Add FOLL_LONGTERM to GUP fast and use it".

HFI1, qib, and mthca, use get_user_pages_fast() due to its performance
advantages.  These pages can be held for a significant time.  But
get_user_pages_fast() does not protect against mapping FS DAX pages.

Introduce FOLL_LONGTERM and use this flag in get_user_pages_fast() which
retains the performance while also adding the FS DAX checks.  XDP has also
shown interest in using this functionality.[1]

In addition we change get_user_pages() to use the new FOLL_LONGTERM flag
and remove the specialized get_user_pages_longterm call.

[1] https://lkml.org/lkml/2019/2/11/1789


This patch (of 7):

Rather than have a separate get_user_pages_longterm() call, introduce
FOLL_LONGTERM and change the longterm callers to use it.

This patch does not change any functionality.

FOLL_LONGTERM can only be supported with get_user_pages() as it requires
vmas to determine if DAX is in use.

Link: http://lkml.kernel.org/r/20190317183438.2057-2-ira.weiny@xxxxxxxxx
Signed-off-by: Ira Weiny <ira.weiny@xxxxxxxxx>
Cc: Aneesh Kumar K.V <aneesh.kumar@xxxxxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxxxx>
Cc: John Hubbard <jhubbard@xxxxxxxxxx>
Cc: "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Jason Gunthorpe <jgg@xxxxxxxx>
Cc: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
Cc: Paul Mackerras <paulus@xxxxxxxxx>
Cc: "David S. Miller" <davem@xxxxxxxxxxxxx>
Cc: Martin Schwidefsky <schwidefsky@xxxxxxxxxx>
Cc: Heiko Carstens <heiko.carstens@xxxxxxxxxx>
Cc: Rich Felker <dalias@xxxxxxxx>
Cc: Yoshinori Sato <ysato@xxxxxxxxxxxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Borislav Petkov <bp@xxxxxxxxx>
Cc: Ralf Baechle <ralf@xxxxxxxxxxxxxx>
Cc: James Hogan <jhogan@xxxxxxxxxx>
Cc: Dan Williams <dan.j.williams@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---

 arch/powerpc/mm/mmu_context_iommu.c        |    3 
 drivers/infiniband/core/umem.c             |    5 
 drivers/infiniband/hw/qib/qib_user_pages.c |    8 
 drivers/infiniband/hw/usnic/usnic_uiom.c   |    9 
 drivers/media/v4l2-core/videobuf-dma-sg.c  |    6 
 drivers/vfio/vfio_iommu_type1.c            |    3 
 fs/io_uring.c                              |    5 
 include/linux/mm.h                         |   14 -
 mm/gup.c                                   |  173 +++++++++++--------
 mm/gup_benchmark.c                         |    5 
 net/xdp/xdp_umem.c                         |    4 
 11 files changed, 130 insertions(+), 105 deletions(-)

--- a/arch/powerpc/mm/mmu_context_iommu.c~mm-gup-replace-get_user_pages_longterm-with-foll_longterm
+++ a/arch/powerpc/mm/mmu_context_iommu.c
@@ -148,7 +148,8 @@ static long mm_iommu_do_alloc(struct mm_
 	}
 
 	down_read(&mm->mmap_sem);
-	ret = get_user_pages_longterm(ua, entries, FOLL_WRITE, mem->hpages, NULL);
+	ret = get_user_pages(ua, entries, FOLL_WRITE | FOLL_LONGTERM,
+			     mem->hpages, NULL);
 	up_read(&mm->mmap_sem);
 	if (ret != entries) {
 		/* free the reference taken */
--- a/drivers/infiniband/core/umem.c~mm-gup-replace-get_user_pages_longterm-with-foll_longterm
+++ a/drivers/infiniband/core/umem.c
@@ -189,10 +189,11 @@ struct ib_umem *ib_umem_get(struct ib_ud
 
 	while (npages) {
 		down_read(&mm->mmap_sem);
-		ret = get_user_pages_longterm(cur_base,
+		ret = get_user_pages(cur_base,
 				     min_t(unsigned long, npages,
 					   PAGE_SIZE / sizeof (struct page *)),
-				     gup_flags, page_list, vma_list);
+				     gup_flags | FOLL_LONGTERM,
+				     page_list, vma_list);
 		if (ret < 0) {
 			up_read(&mm->mmap_sem);
 			goto umem_release;
--- a/drivers/infiniband/hw/qib/qib_user_pages.c~mm-gup-replace-get_user_pages_longterm-with-foll_longterm
+++ a/drivers/infiniband/hw/qib/qib_user_pages.c
@@ -114,10 +114,10 @@ int qib_get_user_pages(unsigned long sta
 
 	down_read(&current->mm->mmap_sem);
 	for (got = 0; got < num_pages; got += ret) {
-		ret = get_user_pages_longterm(start_page + got * PAGE_SIZE,
-					      num_pages - got,
-					      FOLL_WRITE | FOLL_FORCE,
-					      p + got, NULL);
+		ret = get_user_pages(start_page + got * PAGE_SIZE,
+				     num_pages - got,
+				     FOLL_LONGTERM | FOLL_WRITE | FOLL_FORCE,
+				     p + got, NULL);
 		if (ret < 0) {
 			up_read(&current->mm->mmap_sem);
 			goto bail_release;
--- a/drivers/infiniband/hw/usnic/usnic_uiom.c~mm-gup-replace-get_user_pages_longterm-with-foll_longterm
+++ a/drivers/infiniband/hw/usnic/usnic_uiom.c
@@ -143,10 +143,11 @@ static int usnic_uiom_get_pages(unsigned
 	ret = 0;
 
 	while (npages) {
-		ret = get_user_pages_longterm(cur_base,
-					min_t(unsigned long, npages,
-					PAGE_SIZE / sizeof(struct page *)),
-					gup_flags, page_list, NULL);
+		ret = get_user_pages(cur_base,
+				     min_t(unsigned long, npages,
+				     PAGE_SIZE / sizeof(struct page *)),
+				     gup_flags | FOLL_LONGTERM,
+				     page_list, NULL);
 
 		if (ret < 0)
 			goto out;
--- a/drivers/media/v4l2-core/videobuf-dma-sg.c~mm-gup-replace-get_user_pages_longterm-with-foll_longterm
+++ a/drivers/media/v4l2-core/videobuf-dma-sg.c
@@ -186,12 +186,12 @@ static int videobuf_dma_init_user_locked
 	dprintk(1, "init user [0x%lx+0x%lx => %d pages]\n",
 		data, size, dma->nr_pages);
 
-	err = get_user_pages_longterm(data & PAGE_MASK, dma->nr_pages,
-			     flags, dma->pages, NULL);
+	err = get_user_pages(data & PAGE_MASK, dma->nr_pages,
+			     flags | FOLL_LONGTERM, dma->pages, NULL);
 
 	if (err != dma->nr_pages) {
 		dma->nr_pages = (err >= 0) ? err : 0;
-		dprintk(1, "get_user_pages_longterm: err=%d [%d]\n", err,
+		dprintk(1, "get_user_pages: err=%d [%d]\n", err,
 			dma->nr_pages);
 		return err < 0 ? err : -EINVAL;
 	}
--- a/drivers/vfio/vfio_iommu_type1.c~mm-gup-replace-get_user_pages_longterm-with-foll_longterm
+++ a/drivers/vfio/vfio_iommu_type1.c
@@ -351,7 +351,8 @@ static int vaddr_get_pfn(struct mm_struc
 
 	down_read(&mm->mmap_sem);
 	if (mm == current->mm) {
-		ret = get_user_pages_longterm(vaddr, 1, flags, page, vmas);
+		ret = get_user_pages(vaddr, 1, flags | FOLL_LONGTERM, page,
+				     vmas);
 	} else {
 		ret = get_user_pages_remote(NULL, mm, vaddr, 1, flags, page,
 					    vmas, NULL);
--- a/fs/io_uring.c~mm-gup-replace-get_user_pages_longterm-with-foll_longterm
+++ a/fs/io_uring.c
@@ -2452,8 +2452,9 @@ static int io_sqe_buffer_register(struct
 
 		ret = 0;
 		down_read(&current->mm->mmap_sem);
-		pret = get_user_pages_longterm(ubuf, nr_pages, FOLL_WRITE,
-						pages, vmas);
+		pret = get_user_pages(ubuf, nr_pages,
+				      FOLL_WRITE | FOLL_LONGTERM,
+				      pages, vmas);
 		if (pret == nr_pages) {
 			/* don't support file backed memory */
 			for (j = 0; j < nr_pages; j++) {
--- a/include/linux/mm.h~mm-gup-replace-get_user_pages_longterm-with-foll_longterm
+++ a/include/linux/mm.h
@@ -1492,19 +1492,6 @@ long get_user_pages_locked(unsigned long
 long get_user_pages_unlocked(unsigned long start, unsigned long nr_pages,
 		    struct page **pages, unsigned int gup_flags);
 
-#if defined(CONFIG_FS_DAX) || defined(CONFIG_CMA)
-long get_user_pages_longterm(unsigned long start, unsigned long nr_pages,
-			    unsigned int gup_flags, struct page **pages,
-			    struct vm_area_struct **vmas);
-#else
-static inline long get_user_pages_longterm(unsigned long start,
-		unsigned long nr_pages, unsigned int gup_flags,
-		struct page **pages, struct vm_area_struct **vmas)
-{
-	return get_user_pages(start, nr_pages, gup_flags, pages, vmas);
-}
-#endif /* CONFIG_FS_DAX */
-
 int get_user_pages_fast(unsigned long start, int nr_pages, int write,
 			struct page **pages);
 
@@ -2570,6 +2557,7 @@ struct page *follow_page(struct vm_area_
 #define FOLL_REMOTE	0x2000	/* we are working on non-current tsk/mm */
 #define FOLL_COW	0x4000	/* internal GUP flag */
 #define FOLL_ANON	0x8000	/* don't do file mappings */
+#define FOLL_LONGTERM	0x10000	/* mapping is intended for a long term pin */
 
 static inline int vm_fault_to_errno(vm_fault_t vm_fault, int foll_flags)
 {
--- a/mm/gup_benchmark.c~mm-gup-replace-get_user_pages_longterm-with-foll_longterm
+++ a/mm/gup_benchmark.c
@@ -54,8 +54,9 @@ static int __gup_benchmark_ioctl(unsigne
 						 pages + i);
 			break;
 		case GUP_LONGTERM_BENCHMARK:
-			nr = get_user_pages_longterm(addr, nr, gup->flags & 1,
-						     pages + i, NULL);
+			nr = get_user_pages(addr, nr,
+					    (gup->flags & 1) | FOLL_LONGTERM,
+					    pages + i, NULL);
 			break;
 		case GUP_BENCHMARK:
 			nr = get_user_pages(addr, nr, gup->flags & 1, pages + i,
--- a/mm/gup.c~mm-gup-replace-get_user_pages_longterm-with-foll_longterm
+++ a/mm/gup.c
@@ -1112,26 +1112,7 @@ long get_user_pages_remote(struct task_s
 }
 EXPORT_SYMBOL(get_user_pages_remote);
 
-/*
- * This is the same as get_user_pages_remote(), just with a
- * less-flexible calling convention where we assume that the task
- * and mm being operated on are the current task's and don't allow
- * passing of a locked parameter.  We also obviously don't pass
- * FOLL_REMOTE in here.
- */
-long get_user_pages(unsigned long start, unsigned long nr_pages,
-		unsigned int gup_flags, struct page **pages,
-		struct vm_area_struct **vmas)
-{
-	return __get_user_pages_locked(current, current->mm, start, nr_pages,
-				       pages, vmas, NULL,
-				       gup_flags | FOLL_TOUCH);
-}
-EXPORT_SYMBOL(get_user_pages);
-
 #if defined(CONFIG_FS_DAX) || defined (CONFIG_CMA)
-
-#ifdef CONFIG_FS_DAX
 static bool check_dax_vmas(struct vm_area_struct **vmas, long nr_pages)
 {
 	long i;
@@ -1150,12 +1131,6 @@ static bool check_dax_vmas(struct vm_are
 	}
 	return false;
 }
-#else
-static inline bool check_dax_vmas(struct vm_area_struct **vmas, long nr_pages)
-{
-	return false;
-}
-#endif
 
 #ifdef CONFIG_CMA
 static struct page *new_non_cma_page(struct page *page, unsigned long private)
@@ -1209,10 +1184,13 @@ static struct page *new_non_cma_page(str
 	return __alloc_pages_node(nid, gfp_mask, 0);
 }
 
-static long check_and_migrate_cma_pages(unsigned long start, long nr_pages,
-					unsigned int gup_flags,
+static long check_and_migrate_cma_pages(struct task_struct *tsk,
+					struct mm_struct *mm,
+					unsigned long start,
+					unsigned long nr_pages,
 					struct page **pages,
-					struct vm_area_struct **vmas)
+					struct vm_area_struct **vmas,
+					unsigned int gup_flags)
 {
 	long i;
 	bool drain_allow = true;
@@ -1268,10 +1246,14 @@ check_again:
 				putback_movable_pages(&cma_page_list);
 		}
 		/*
-		 * We did migrate all the pages, Try to get the page references again
-		 * migrating any new CMA pages which we failed to isolate earlier.
+		 * We did migrate all the pages, Try to get the page references
+		 * again migrating any new CMA pages which we failed to isolate
+		 * earlier.
 		 */
-		nr_pages = get_user_pages(start, nr_pages, gup_flags, pages, vmas);
+		nr_pages = __get_user_pages_locked(tsk, mm, start, nr_pages,
+						   pages, vmas, NULL,
+						   gup_flags);
+
 		if ((nr_pages > 0) && migrate_allow) {
 			drain_allow = true;
 			goto check_again;
@@ -1281,66 +1263,115 @@ check_again:
 	return nr_pages;
 }
 #else
-static inline long check_and_migrate_cma_pages(unsigned long start, long nr_pages,
-					       unsigned int gup_flags,
-					       struct page **pages,
-					       struct vm_area_struct **vmas)
+static long check_and_migrate_cma_pages(struct task_struct *tsk,
+					struct mm_struct *mm,
+					unsigned long start,
+					unsigned long nr_pages,
+					struct page **pages,
+					struct vm_area_struct **vmas,
+					unsigned int gup_flags)
 {
 	return nr_pages;
 }
 #endif
 
 /*
- * This is the same as get_user_pages() in that it assumes we are
- * operating on the current task's mm, but it goes further to validate
- * that the vmas associated with the address range are suitable for
- * longterm elevated page reference counts. For example, filesystem-dax
- * mappings are subject to the lifetime enforced by the filesystem and
- * we need guarantees that longterm users like RDMA and V4L2 only
- * establish mappings that have a kernel enforced revocation mechanism.
+ * __gup_longterm_locked() is a wrapper for __get_uer_pages_locked which
+ * allows us to process the FOLL_LONGTERM flag if present.
+ *
+ * FOLL_LONGTERM Checks for either DAX VMAs or PPC CMA regions and either fails
+ * the pin or attempts to migrate the page as appropriate.
+ *
+ * In the filesystem-dax case mappings are subject to the lifetime enforced by
+ * the filesystem and we need guarantees that longterm users like RDMA and V4L2
+ * only establish mappings that have a kernel enforced revocation mechanism.
+ *
+ * In the CMA case pages can't be pinned in a CMA region as this would
+ * unnecessarily fragment that region.  So CMA attempts to migrate the page
+ * before pinning.
  *
  * "longterm" == userspace controlled elevated page count lifetime.
  * Contrast this to iov_iter_get_pages() usages which are transient.
  */
-long get_user_pages_longterm(unsigned long start, unsigned long nr_pages,
-			     unsigned int gup_flags, struct page **pages,
-			     struct vm_area_struct **vmas_arg)
+static __always_inline long __gup_longterm_locked(struct task_struct *tsk,
+						  struct mm_struct *mm,
+						  unsigned long start,
+						  unsigned long nr_pages,
+						  struct page **pages,
+						  struct vm_area_struct **vmas,
+						  unsigned int gup_flags)
 {
-	struct vm_area_struct **vmas = vmas_arg;
-	unsigned long flags;
+	struct vm_area_struct **vmas_tmp = vmas;
+	unsigned long flags = 0;
 	long rc, i;
 
-	if (!pages)
-		return -EINVAL;
+	if (gup_flags & FOLL_LONGTERM) {
+		if (!pages)
+			return -EINVAL;
+
+		if (!vmas_tmp) {
+			vmas_tmp = kcalloc(nr_pages,
+					   sizeof(struct vm_area_struct *),
+					   GFP_KERNEL);
+			if (!vmas_tmp)
+				return -ENOMEM;
+		}
+		flags = memalloc_nocma_save();
+	}
 
-	if (!vmas) {
-		vmas = kcalloc(nr_pages, sizeof(struct vm_area_struct *),
-			       GFP_KERNEL);
-		if (!vmas)
-			return -ENOMEM;
-	}
-
-	flags = memalloc_nocma_save();
-	rc = get_user_pages(start, nr_pages, gup_flags, pages, vmas);
-	memalloc_nocma_restore(flags);
-	if (rc < 0)
-		goto out;
+	rc = __get_user_pages_locked(tsk, mm, start, nr_pages, pages,
+				     vmas_tmp, NULL, gup_flags);
 
-	if (check_dax_vmas(vmas, rc)) {
-		for (i = 0; i < rc; i++)
-			put_page(pages[i]);
-		rc = -EOPNOTSUPP;
-		goto out;
+	if (gup_flags & FOLL_LONGTERM) {
+		memalloc_nocma_restore(flags);
+		if (rc < 0)
+			goto out;
+
+		if (check_dax_vmas(vmas_tmp, rc)) {
+			for (i = 0; i < rc; i++)
+				put_page(pages[i]);
+			rc = -EOPNOTSUPP;
+			goto out;
+		}
+
+		rc = check_and_migrate_cma_pages(tsk, mm, start, rc, pages,
+						 vmas_tmp, gup_flags);
 	}
 
-	rc = check_and_migrate_cma_pages(start, rc, gup_flags, pages, vmas);
 out:
-	if (vmas != vmas_arg)
-		kfree(vmas);
+	if (vmas_tmp != vmas)
+		kfree(vmas_tmp);
 	return rc;
 }
-EXPORT_SYMBOL(get_user_pages_longterm);
-#endif /* CONFIG_FS_DAX */
+#else /* !CONFIG_FS_DAX && !CONFIG_CMA */
+static __always_inline long __gup_longterm_locked(struct task_struct *tsk,
+						  struct mm_struct *mm,
+						  unsigned long start,
+						  unsigned long nr_pages,
+						  struct page **pages,
+						  struct vm_area_struct **vmas,
+						  unsigned int flags)
+{
+	return __get_user_pages_locked(tsk, mm, start, nr_pages, pages, vmas,
+				       NULL, flags);
+}
+#endif /* CONFIG_FS_DAX || CONFIG_CMA */
+
+/*
+ * This is the same as get_user_pages_remote(), just with a
+ * less-flexible calling convention where we assume that the task
+ * and mm being operated on are the current task's and don't allow
+ * passing of a locked parameter.  We also obviously don't pass
+ * FOLL_REMOTE in here.
+ */
+long get_user_pages(unsigned long start, unsigned long nr_pages,
+		unsigned int gup_flags, struct page **pages,
+		struct vm_area_struct **vmas)
+{
+	return __gup_longterm_locked(current, current->mm, start, nr_pages,
+				     pages, vmas, gup_flags | FOLL_TOUCH);
+}
+EXPORT_SYMBOL(get_user_pages);
 
 /**
  * populate_vma_page_range() -  populate a range of pages in the vma.
--- a/net/xdp/xdp_umem.c~mm-gup-replace-get_user_pages_longterm-with-foll_longterm
+++ a/net/xdp/xdp_umem.c
@@ -267,8 +267,8 @@ static int xdp_umem_pin_pages(struct xdp
 		return -ENOMEM;
 
 	down_read(&current->mm->mmap_sem);
-	npgs = get_user_pages_longterm(umem->address, umem->npgs,
-				       gup_flags, &umem->pgs[0], NULL);
+	npgs = get_user_pages(umem->address, umem->npgs,
+			      gup_flags | FOLL_LONGTERM, &umem->pgs[0], NULL);
 	up_read(&current->mm->mmap_sem);
 
 	if (npgs != umem->npgs) {
_

Patches currently in -mm which might be from ira.weiny@xxxxxxxxx are

mm-gup-replace-get_user_pages_longterm-with-foll_longterm.patch
mm-gup-change-write-parameter-to-flags-in-fast-walk.patch
mm-gup-change-gup-fast-to-use-flags-rather-than-a-write-bool.patch
mm-gup-add-foll_longterm-capability-to-gup-fast.patch
ib-hfi1-use-the-new-foll_longterm-flag-to-get_user_pages_fast.patch
ib-qib-use-the-new-foll_longterm-flag-to-get_user_pages_fast.patch
ib-mthca-use-the-new-foll_longterm-flag-to-get_user_pages_fast.patch




[Index of Archives]     [Kernel Archive]     [IETF Annouce]     [DCCP]     [Netdev]     [Networking]     [Security]     [Bugtraq]     [Yosemite]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Linux SCSI]

  Powered by Linux