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git://nv-tegra.nvidia.com/linux-nv-oot.git
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6b88806712
xa_alloc can return the handle id which was freed recently. Instead, once handle id is provided, next time start from next handle id. Once max limit is reached then start from U32MAX / 2 again. Bug 4171509 Change-Id: Ib5678136835e809632e4a2498b4dffe522e56c8d Signed-off-by: Ketan Patil <ketanp@nvidia.com> Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvidia/+/2942022 (cherry picked from commit 2927da12a16d69d2bc49d3a6e910abefefd77f5b) Reviewed-on: https://git-master.nvidia.com/r/c/linux-nv-oot/+/2942016 Reviewed-by: Sachin Nikam <snikam@nvidia.com> GVS: Gerrit_Virtual_Submit <buildbot_gerritrpt@nvidia.com>
85 lines
1.6 KiB
C
85 lines
1.6 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (c) 2011-2023, NVIDIA Corporation. All rights reserved.
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*/
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#include <linux/xarray.h>
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#include <linux/dma-buf.h>
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#include "nvmap_priv.h"
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/*
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* Initialize xarray mapping
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*/
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void nvmap_id_array_init(struct xarray *id_arr)
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{
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xa_init_flags(id_arr, XA_FLAGS_ALLOC1);
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}
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/*
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* Remove id to dma_buf mapping
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*/
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void nvmap_id_array_exit(struct xarray *id_arr)
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{
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xa_destroy(id_arr);
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}
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/*
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* Create mapping between the id(NvRmMemHandle) and dma_buf
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*/
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int nvmap_id_array_id_alloc(struct xarray *id_arr, u32 *id, struct dma_buf *dmabuf)
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{
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static u32 xa_start = U32_MAX / 2;
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int e;
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if (!id_arr || !dmabuf)
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return -EINVAL;
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alloc_from_start:
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e = xa_alloc(id_arr, id, dmabuf,
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XA_LIMIT(xa_start, U32_MAX), GFP_KERNEL);
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xa_lock(id_arr);
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if (!e) {
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if (*id == U32_MAX)
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xa_start = U32_MAX / 2;
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else
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xa_start = *id + 1;
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} else if (e == -EBUSY && xa_start != U32_MAX / 2) {
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/*
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* xa_alloc returns -EBUSY if there are no free entries.
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* In this case we will give one more try by resetting xa_start.
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*/
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xa_start = U32_MAX / 2;
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xa_unlock(id_arr);
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goto alloc_from_start;
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}
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xa_unlock(id_arr);
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return e;
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}
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/*
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* Clear mapping between the id(NvRmMemHandle) and dma_buf
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*/
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struct dma_buf *nvmap_id_array_id_release(struct xarray *id_arr, u32 id)
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{
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if (!id_arr || !id)
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return NULL;
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return xa_erase(id_arr, id);
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}
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/*
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* Return dma_buf from the id.
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*/
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struct dma_buf *nvmap_id_array_get_dmabuf_from_id(struct xarray *id_arr, u32 id)
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{
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struct dma_buf *dmabuf;
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dmabuf = xa_load(id_arr, id);
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if (!IS_ERR_OR_NULL(dmabuf))
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get_dma_buf(dmabuf);
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return dmabuf;
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}
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