On Mon, Oct 31, 2016 at 09:44:07AM -0400, Rob Clark wrote:
> From: Rob Clark <robclark@xxxxxxxxxxxxxxx>
>
> Rather than cut/pasting these couple ioctl wrappers everywhere, just
> stuff them as static-inline into a header.
>
> Signed-off-by: Rob Clark <robclark@xxxxxxxxxxxxxxx>
> ---
> This is probably mostly used from mesa, but some drivers, test apps, etc
> may also want to use it from libdrm.
>
> Makefile.sources | 1 +
> libsync.h | 74 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
> 2 files changed, 75 insertions(+)
> create mode 100644 libsync.h
>
> diff --git a/Makefile.sources b/Makefile.sources
> index a57036a..10aa1d0 100644
> --- a/Makefile.sources
> +++ b/Makefile.sources
> @@ -13,6 +13,7 @@ LIBDRM_FILES := \
> util_math.h
>
> LIBDRM_H_FILES := \
> + libsync.h \
> xf86drm.h \
> xf86drmMode.h
>
> diff --git a/libsync.h b/libsync.h
> new file mode 100644
> index 0000000..fc23b7f
> --- /dev/null
> +++ b/libsync.h
> @@ -0,0 +1,74 @@
> +/*
> + * sync abstraction
> + * Copyright 2015-2016 Collabora Ltd.
> + *
> + * Based on the implementation from the Android Open Source Project,
> + *
> + * Copyright 2012 Google, Inc
> + *
> + * Permission is hereby granted, free of charge, to any person obtaining a
> + * copy of this software and associated documentation files (the "Software"),
> + * to deal in the Software without restriction, including without limitation
> + * the rights to use, copy, modify, merge, publish, distribute, sublicense,
> + * and/or sell copies of the Software, and to permit persons to whom the
> + * Software is furnished to do so, subject to the following conditions:
> + *
> + * The above copyright notice and this permission notice shall be included in
> + * all copies or substantial portions of the Software.
> + *
> + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
> + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
> + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
> + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
> + * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
> + * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
> + * OTHER DEALINGS IN THE SOFTWARE.
> + */
> +
> +#ifndef _LIBSYNC_H
> +#define _LIBSYNC_H
> +
> +#include <stdint.h>
> +#include <string.h>
> +#include <sys/ioctl.h>
> +#include <sys/poll.h>
> +
> +// todo prob should just #include <linux/sync_file.h> ?
> +struct sync_merge_data {
> + char name[32];
> + int32_t fd2;
> + int32_t fence;
> + uint32_t flags;
> + uint32_t pad;
> +};
> +#define SYNC_IOC_MAGIC '>'
> +#define SYNC_IOC_MERGE _IOWR(SYNC_IOC_MAGIC, 3, struct sync_merge_data)
> +
> +
> +
> +static inline int sync_wait(int fd, int timeout)
> +{
> + struct pollfd fds;
> +
> + fds.fd = fd;
> + fds.events = POLLIN | POLLERR;
POLLERR is implied and ignored in fds.events.
> + return poll(&fds, 1, timeout);
Returns: -1 on error, 0 on timeout, 1 if signaled.
This function is horrible wrt to -EINTR for example :) Hmm, mixing
poll() and looping over signals until timeout doesn't look as
straightforward.
> +}
> +
> +static inline int sync_merge(const char *name, int fd1, int fd2)
> +{
> + struct sync_merge_data data = {};
> + int err;
What I liked was doing
if (fd2 < 0)
return dup(fd1);
if (fd1 < 0)
return dup(fd2);
That makes accumulating the fences in the caller much easier (i.e. they
start with
batch.fence_in = -1;
then
batch.fence_in = sync_merge(batch.fence_in, fence);
finished by
execbuf(&batch);
close(batch.fence_in);
batch.fence_in = -1;
-Chris
--
Chris Wilson, Intel Open Source Technology Centre
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