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authorDaniel Jordan <daniel.m.jordan@oracle.com>2019-07-16 16:30:54 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2019-07-16 19:23:25 -0700
commit79eb597cba06c435b72f220e9d426ae413fc2579 (patch)
treee639df77d252fde2e81fee12a90bc840f6bca7fc /drivers/vfio
parent73b20c84d42de14673a987816dd4d132c7b1f801 (diff)
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mm: add account_locked_vm utility function
locked_vm accounting is done roughly the same way in five places, so unify them in a helper. Include the helper's caller in the debug print to distinguish between callsites. Error codes stay the same, so user-visible behavior does too. The one exception is that the -EPERM case in tce_account_locked_vm is removed because Alexey has never seen it triggered. [daniel.m.jordan@oracle.com: v3] Link: http://lkml.kernel.org/r/20190529205019.20927-1-daniel.m.jordan@oracle.com [sfr@canb.auug.org.au: fix mm/util.c] Link: http://lkml.kernel.org/r/20190524175045.26897-1-daniel.m.jordan@oracle.com Signed-off-by: Daniel Jordan <daniel.m.jordan@oracle.com> Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au> Tested-by: Alexey Kardashevskiy <aik@ozlabs.ru> Acked-by: Alex Williamson <alex.williamson@redhat.com> Cc: Alan Tull <atull@kernel.org> Cc: Alex Williamson <alex.williamson@redhat.com> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Christoph Lameter <cl@linux.com> Cc: Christophe Leroy <christophe.leroy@c-s.fr> Cc: Davidlohr Bueso <dave@stgolabs.net> Cc: Jason Gunthorpe <jgg@mellanox.com> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Moritz Fischer <mdf@kernel.org> Cc: Paul Mackerras <paulus@ozlabs.org> Cc: Steve Sistare <steven.sistare@oracle.com> Cc: Wu Hao <hao.wu@intel.com> Cc: Ira Weiny <ira.weiny@intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/vfio')
-rw-r--r--drivers/vfio/vfio_iommu_spapr_tce.c54
-rw-r--r--drivers/vfio/vfio_iommu_type1.c17
2 files changed, 7 insertions, 64 deletions
diff --git a/drivers/vfio/vfio_iommu_spapr_tce.c b/drivers/vfio/vfio_iommu_spapr_tce.c
index 7048c9198c21..8ce9ad21129f 100644
--- a/drivers/vfio/vfio_iommu_spapr_tce.c
+++ b/drivers/vfio/vfio_iommu_spapr_tce.c
@@ -19,6 +19,7 @@
#include <linux/vmalloc.h>
#include <linux/sched/mm.h>
#include <linux/sched/signal.h>
+#include <linux/mm.h>
#include <asm/iommu.h>
#include <asm/tce.h>
@@ -31,51 +32,6 @@
static void tce_iommu_detach_group(void *iommu_data,
struct iommu_group *iommu_group);
-static long try_increment_locked_vm(struct mm_struct *mm, long npages)
-{
- long ret = 0, locked, lock_limit;
-
- if (WARN_ON_ONCE(!mm))
- return -EPERM;
-
- if (!npages)
- return 0;
-
- down_write(&mm->mmap_sem);
- locked = mm->locked_vm + npages;
- lock_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT;
- if (locked > lock_limit && !capable(CAP_IPC_LOCK))
- ret = -ENOMEM;
- else
- mm->locked_vm += npages;
-
- pr_debug("[%d] RLIMIT_MEMLOCK +%ld %ld/%ld%s\n", current->pid,
- npages << PAGE_SHIFT,
- mm->locked_vm << PAGE_SHIFT,
- rlimit(RLIMIT_MEMLOCK),
- ret ? " - exceeded" : "");
-
- up_write(&mm->mmap_sem);
-
- return ret;
-}
-
-static void decrement_locked_vm(struct mm_struct *mm, long npages)
-{
- if (!mm || !npages)
- return;
-
- down_write(&mm->mmap_sem);
- if (WARN_ON_ONCE(npages > mm->locked_vm))
- npages = mm->locked_vm;
- mm->locked_vm -= npages;
- pr_debug("[%d] RLIMIT_MEMLOCK -%ld %ld/%ld\n", current->pid,
- npages << PAGE_SHIFT,
- mm->locked_vm << PAGE_SHIFT,
- rlimit(RLIMIT_MEMLOCK));
- up_write(&mm->mmap_sem);
-}
-
/*
* VFIO IOMMU fd for SPAPR_TCE IOMMU implementation
*
@@ -333,7 +289,7 @@ static int tce_iommu_enable(struct tce_container *container)
return ret;
locked = table_group->tce32_size >> PAGE_SHIFT;
- ret = try_increment_locked_vm(container->mm, locked);
+ ret = account_locked_vm(container->mm, locked, true);
if (ret)
return ret;
@@ -352,7 +308,7 @@ static void tce_iommu_disable(struct tce_container *container)
container->enabled = false;
BUG_ON(!container->mm);
- decrement_locked_vm(container->mm, container->locked_pages);
+ account_locked_vm(container->mm, container->locked_pages, false);
}
static void *tce_iommu_open(unsigned long arg)
@@ -656,7 +612,7 @@ static long tce_iommu_create_table(struct tce_container *container,
if (!table_size)
return -EINVAL;
- ret = try_increment_locked_vm(container->mm, table_size >> PAGE_SHIFT);
+ ret = account_locked_vm(container->mm, table_size >> PAGE_SHIFT, true);
if (ret)
return ret;
@@ -675,7 +631,7 @@ static void tce_iommu_free_table(struct tce_container *container,
unsigned long pages = tbl->it_allocated_size >> PAGE_SHIFT;
iommu_tce_table_put(tbl);
- decrement_locked_vm(container->mm, pages);
+ account_locked_vm(container->mm, pages, false);
}
static long tce_iommu_create_window(struct tce_container *container,
diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type1.c
index add34adfadc7..054391f30fa8 100644
--- a/drivers/vfio/vfio_iommu_type1.c
+++ b/drivers/vfio/vfio_iommu_type1.c
@@ -272,21 +272,8 @@ static int vfio_lock_acct(struct vfio_dma *dma, long npage, bool async)
ret = down_write_killable(&mm->mmap_sem);
if (!ret) {
- if (npage > 0) {
- if (!dma->lock_cap) {
- unsigned long limit;
-
- limit = task_rlimit(dma->task,
- RLIMIT_MEMLOCK) >> PAGE_SHIFT;
-
- if (mm->locked_vm + npage > limit)
- ret = -ENOMEM;
- }
- }
-
- if (!ret)
- mm->locked_vm += npage;
-
+ ret = __account_locked_vm(mm, abs(npage), npage > 0, dma->task,
+ dma->lock_cap);
up_write(&mm->mmap_sem);
}