diff options
Diffstat (limited to 'drivers/vfio/vfio_iommu_spapr_tce.c')
| -rw-r--r-- | drivers/vfio/vfio_iommu_spapr_tce.c | 59 |
1 files changed, 6 insertions, 53 deletions
diff --git a/drivers/vfio/vfio_iommu_spapr_tce.c b/drivers/vfio/vfio_iommu_spapr_tce.c index 40ddc0c5f677..8ce9ad21129f 100644 --- a/drivers/vfio/vfio_iommu_spapr_tce.c +++ b/drivers/vfio/vfio_iommu_spapr_tce.c @@ -1,13 +1,10 @@ +// SPDX-License-Identifier: GPL-2.0-only /* * VFIO: IOMMU DMA mapping support for TCE on POWER * * Copyright (C) 2013 IBM Corp. All rights reserved. * Author: Alexey Kardashevskiy <aik@ozlabs.ru> * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 as - * published by the Free Software Foundation. - * * Derived from original vfio_iommu_type1.c: * Copyright (C) 2012 Red Hat, Inc. All rights reserved. * Author: Alex Williamson <alex.williamson@redhat.com> @@ -22,6 +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> @@ -34,51 +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 * @@ -336,7 +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; @@ -355,7 +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) @@ -659,7 +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; @@ -678,7 +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, |