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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/+/3447073
(cherry picked from commit 5ef68aa58f)
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nv-oot/+/3458548
GVS: buildbot_gerritrpt <buildbot_gerritrpt@nvidia.com>
Tested-by: Amulya Yarlagadda <ayarlagadda@nvidia.com>
Reviewed-by: Amulya Yarlagadda <ayarlagadda@nvidia.com>
This commit is contained in:
Ketan Patil
2025-09-05 06:58:04 +00:00
committed by Amulya Yarlagadda
parent 9148f21496
commit f650780b9f
3 changed files with 23 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files

3
drivers/video/tegra/nvmap/nvmap_dmabuf.c
View File

@@ -1,6 +1,6 @@
// SPDX-License-Identifier: GPL-2.0-only
/*
* SPDX-FileCopyrightText: Copyright (c) 2012-2024 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
* SPDX-FileCopyrightText: Copyright (c) 2012-2025 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
*
* dma_buf exporter for nvmap
*/
@@ -410,6 +410,7 @@ static int __nvmap_map(struct nvmap_handle *h, struct vm_area_struct *vma)
nvmap_handle_put(h);
return -ENOMEM;
}
mutex_init(&priv->vma_lock);
priv->handle = h;
#if defined(NV_VM_AREA_STRUCT_HAS_CONST_VM_FLAGS) /* Linux v6.3 */

5
drivers/video/tegra/nvmap/nvmap_dmabuf.h
View File

@@ -1,5 +1,5 @@
/* SPDX-License-Identifier: GPL-2.0-only */
/* SPDX-FileCopyrightText: Copyright (c) 2024 NVIDIA CORPORATION & AFFILIATES. All rights reserved. */
/* SPDX-FileCopyrightText: Copyright (c) 2024-2025 NVIDIA CORPORATION & AFFILIATES. All rights reserved. */
#ifndef __NVMAP_DMABUF_H
#define __NVMAP_DMABUF_H
@@ -54,6 +54,9 @@ struct nvmap_vma_priv {
struct nvmap_handle *handle;
size_t offs;
atomic_t count; /* number of processes cloning the VMA */
u64 map_rss_count;
struct mm_struct *mm;
struct mutex vma_lock;
};
int is_nvmap_vma(struct vm_area_struct *vma);

18
drivers/video/tegra/nvmap/nvmap_fault.c
View File

@@ -1,6 +1,6 @@
// SPDX-License-Identifier: GPL-2.0-only
/*
* SPDX-FileCopyrightText: Copyright (c) 2011-2024 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
* SPDX-FileCopyrightText: Copyright (c) 2011-2025 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
*/
#define pr_fmt(fmt) "%s: " fmt, __func__
@@ -145,6 +145,14 @@ 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++) {
@@ -220,6 +228,14 @@ static vm_fault_t nvmap_vma_fault(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);