80933739d5
Userspace clients will be able to restrict cache maintenance to only the subset of the dma-buf which is mmap(ed) by setting the DMA_BUF_SYNC_USER_MAPPED flag when calling the DMA_BUF_IOCTL_SYNC IOCT. Signed-off-by: Swathi Sridhar <swatsrid@codeaurora.org> Bug: 150611569 Test: build (cherry-picked frombbbc80b6d8) [surenb: partial cherry-pick frombbbc80b6d8ion : Merge ion changes from ... to resolve ABI diffs caused by {begin/end}_cpu_access_umapped dma_buf_ops. changed dma_buf_end_cpu_access_umapped to be static.] Signed-off-by: Suren Baghdasaryan <surenb@google.com> Change-Id: Ic2029c5218ca99330a0e7e6128e12ac29cdd1c08
47 lines
1.5 KiB
C
47 lines
1.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
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/*
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* Framework for buffer objects that can be shared across devices/subsystems.
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*
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* Copyright(C) 2015 Intel Ltd
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published by
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* the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef _DMA_BUF_UAPI_H_
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#define _DMA_BUF_UAPI_H_
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#include <linux/types.h>
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/* begin/end dma-buf functions used for userspace mmap. */
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struct dma_buf_sync {
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__u64 flags;
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};
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#define DMA_BUF_SYNC_READ (1 << 0)
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#define DMA_BUF_SYNC_WRITE (2 << 0)
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#define DMA_BUF_SYNC_RW (DMA_BUF_SYNC_READ | DMA_BUF_SYNC_WRITE)
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#define DMA_BUF_SYNC_START (0 << 2)
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#define DMA_BUF_SYNC_END (1 << 2)
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#define DMA_BUF_SYNC_USER_MAPPED (1 << 3)
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#define DMA_BUF_SYNC_VALID_FLAGS_MASK \
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(DMA_BUF_SYNC_RW | DMA_BUF_SYNC_END | DMA_BUF_SYNC_USER_MAPPED)
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#define DMA_BUF_NAME_LEN 32
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#define DMA_BUF_BASE 'b'
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#define DMA_BUF_IOCTL_SYNC _IOW(DMA_BUF_BASE, 0, struct dma_buf_sync)
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#define DMA_BUF_SET_NAME _IOW(DMA_BUF_BASE, 1, const char *)
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#endif
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