From: Vivek Kasireddy <vivek.kasireddy@intel.com>
Date: Wed, 26 May 2021 23:14:16 +0000 (-0700)
Subject: ui: Get the fd associated with udmabuf driver
X-Git-Url: http://git.osdn.net/view?a=commitdiff_plain;h=87f12216d9268ed90e6114a22cbc3f53b0fd8457;p=qmiga%2Fqemu.git

ui: Get the fd associated with udmabuf driver

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>
---

diff --git a/include/ui/console.h b/include/ui/console.h
index ca3c7af6a6..b30b63976a 100644
--- a/include/ui/console.h
+++ b/include/ui/console.h
@@ -471,4 +471,7 @@ bool vnc_display_reload_certs(const char *id,  Error **errp);
 /* input.c */
 int index_from_key(const char *key, size_t key_length);
 
+/* udmabuf.c */
+int udmabuf_fd(void);
+
 #endif
diff --git a/ui/meson.build b/ui/meson.build
index b5aed14886..a3a187d633 100644
--- a/ui/meson.build
+++ b/ui/meson.build
@@ -12,6 +12,7 @@ softmmu_ss.add(files(
   'kbd-state.c',
   'keymaps.c',
   'qemu-pixman.c',
+  'udmabuf.c',
 ))
 softmmu_ss.add([spice_headers, files('spice-module.c')])
 softmmu_ss.add(when: spice_protocol, if_true: files('vdagent.c'))
diff --git a/ui/udmabuf.c b/ui/udmabuf.c
new file mode 100644
index 0000000000..23abe1e7eb
--- /dev/null
+++ b/ui/udmabuf.c
@@ -0,0 +1,40 @@
+/*
+ * udmabuf helper functions.
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ */
+#include "qemu/osdep.h"
+#include "qapi/error.h"
+#include "ui/console.h"
+
+#ifdef CONFIG_LINUX
+
+#include <fcntl.h>
+#include <sys/ioctl.h>
+
+int udmabuf_fd(void)
+{
+    static bool first = true;
+    static int udmabuf;
+
+    if (!first) {
+        return udmabuf;
+    }
+    first = false;
+
+    udmabuf = open("/dev/udmabuf", O_RDWR);
+    if (udmabuf < 0) {
+        warn_report("open /dev/udmabuf: %s", strerror(errno));
+    }
+    return udmabuf;
+}
+
+#else
+
+int udmabuf_fd(void)
+{
+    return -1;
+}
+
+#endif