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git://nv-tegra.nvidia.com/linux-nv-oot.git
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d2d52d6786
- Files for nvmap_handle unit: nvmap_handle.c, nvmap_sci_ipc.c, nvmap_id_array.c. - Define external header for nvmap_handle unit as nvmap_handle.h and move declarations of all external APIs of nvmap_handle unit to this header. - Define internal header for nvmap_handle unit as nvmap_handle_int.h and move declarations of all internally called APIs to this header. JIRA TMM-5651 Change-Id: Ie4922c0839070491f9893f23744eb700cabb9828 Signed-off-by: Ashish Mhetre <amhetre@nvidia.com> Reviewed-on: https://git-master.nvidia.com/r/c/linux-nv-oot/+/3211591 Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com> Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>
86 lines
1.7 KiB
C
86 lines
1.7 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* SPDX-FileCopyrightText: Copyright (c) 2011-2024 NVIDIA CORPORATION & AFFILIATES. 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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#include "nvmap_handle.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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