'\" t
.\"     Title: dma_buf_begin_cpu_access
.\"    Author: [FIXME: author] [see http://docbook.sf.net/el/author]
.\" Generator: DocBook XSL Stylesheets v1.78.1 <http://docbook.sf.net/>
.\"      Date: May 2018
.\"    Manual: Device drivers infrastructure
.\"    Source: Kernel Hackers Manual 3.16.56
.\"  Language: English
.\"
.TH "DMA_BUF_BEGIN_CPU_AC" "9" "May 2018" "Kernel Hackers Manual 3\&.16\&" "Device drivers infrastructure"
.\" -----------------------------------------------------------------
.\" * Define some portability stuff
.\" -----------------------------------------------------------------
.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
.\" http://bugs.debian.org/507673
.\" http://lists.gnu.org/archive/html/groff/2009-02/msg00013.html
.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
.ie \n(.g .ds Aq \(aq
.el       .ds Aq '
.\" -----------------------------------------------------------------
.\" * set default formatting
.\" -----------------------------------------------------------------
.\" disable hyphenation
.nh
.\" disable justification (adjust text to left margin only)
.ad l
.\" -----------------------------------------------------------------
.\" * MAIN CONTENT STARTS HERE *
.\" -----------------------------------------------------------------
.SH "NAME"
dma_buf_begin_cpu_access \- Must be called before accessing a dma_buf from the cpu in the kernel context\&. Calls begin_cpu_access to allow exporter\-specific preparations\&. Coherency is only guaranteed in the specified range for the specified access direction\&.
.SH "SYNOPSIS"
.HP \w'int\ dma_buf_begin_cpu_access('u
.BI "int dma_buf_begin_cpu_access(struct\ dma_buf\ *\ " "dmabuf" ", size_t\ " "start" ", size_t\ " "len" ", enum\ dma_data_direction\ " "direction" ");"
.SH "ARGUMENTS"
.PP
\fIdmabuf\fR
.RS 4
[in] buffer to prepare cpu access for\&.
.RE
.PP
\fIstart\fR
.RS 4
[in] start of range for cpu access\&.
.RE
.PP
\fIlen\fR
.RS 4
[in] length of range for cpu access\&.
.RE
.PP
\fIdirection\fR
.RS 4
[in] length of range for cpu access\&.
.RE
.SH "DESCRIPTION"
.PP
Can return negative error values, returns 0 on success\&.
.SH "COPYRIGHT"
.br