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87f12216d9
Try to open the udmabuf dev node for the first time or return the fd if the device was previously opened. Based-on-patch-by: Gerd Hoffmann <kraxel@redhat.com> Cc: Gerd Hoffmann <kraxel@redhat.com> Signed-off-by: Vivek Kasireddy <vivek.kasireddy@intel.com> Message-Id: <20210526231429.1045476-2-vivek.kasireddy@intel.com> [ kraxel: fixup fcntl.h include ] Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
41 lines
665 B
C
41 lines
665 B
C
/*
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* udmabuf helper functions.
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*/
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#include "qemu/osdep.h"
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#include "qapi/error.h"
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#include "ui/console.h"
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#ifdef CONFIG_LINUX
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#include <fcntl.h>
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#include <sys/ioctl.h>
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int udmabuf_fd(void)
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{
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static bool first = true;
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static int udmabuf;
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if (!first) {
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return udmabuf;
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}
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first = false;
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udmabuf = open("/dev/udmabuf", O_RDWR);
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if (udmabuf < 0) {
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warn_report("open /dev/udmabuf: %s", strerror(errno));
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}
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return udmabuf;
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}
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#else
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int udmabuf_fd(void)
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{
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return -1;
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}
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#endif
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