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video: tegra: nvmap: Avoid double updation of RSS counter

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The RSS counter is updated during buffer allocation as well as mmap,
which is leading to double updation. Fix this by decrementing the RSS
counter during page fault while increment it back during unmap flow.

Bug 5222690

Change-Id: I77972185f20d9d710571cc07ae1c5188060bfa1f
Signed-off-by: Ketan Patil <ketanp@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nv-oot/+/3442670
(cherry picked from commit 1c59063ce7)
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nv-oot/+/3453106
Tested-by: Amulya Yarlagadda <ayarlagadda@nvidia.com>
Reviewed-by: Amulya Yarlagadda <ayarlagadda@nvidia.com>
GVS: buildbot_gerritrpt <buildbot_gerritrpt@nvidia.com>
This commit is contained in:
Ketan Patil
2025-09-02 08:53:30 +00:00
committed by Amulya Yarlagadda
parent 5fc4079741
commit 08fbba8f59
3 changed files with 22 additions and 2 deletions
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18
drivers/video/tegra/nvmap/nvmap_fault.c
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@@ -1,6 +1,6 @@
// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (c) 2011-2023, NVIDIA CORPORATION. All rights reserved.
* Copyright (c) 2011-2025, NVIDIA CORPORATION. All rights reserved.
*/
#define pr_fmt(fmt) "%s: " fmt, __func__
@@ -147,6 +147,14 @@ static void nvmap_vma_close(struct vm_area_struct *vma)
BUG_ON(!vma_found);
nvmap_umaps_dec(h);
mutex_lock(&priv->vma_lock);
if (priv->mm != NULL && h->anon_count != 0) {
nvmap_add_mm_counter(priv->mm, MM_ANONPAGES, priv->map_rss_count);
priv->map_rss_count = 0;
priv->mm = NULL;
}
mutex_unlock(&priv->vma_lock);
if (__atomic_add_unless(&priv->count, -1, 0) == 1) {
if (h->heap_pgalloc) {
for (i = 0; i < nr_page; i++) {
@@ -233,6 +241,14 @@ static int nvmap_vma_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
return VM_FAULT_SIGSEGV;
}
mutex_lock(&priv->vma_lock);
if (priv->handle->anon_count != 0 && current->mm != NULL) {
nvmap_add_mm_counter(current->mm, MM_ANONPAGES, -1);
priv->map_rss_count++;
priv->mm = current->mm;
}
mutex_unlock(&priv->vma_lock);
if (!nvmap_handle_track_dirty(priv->handle))
goto finish;
mutex_lock(&priv->handle->lock);