[v3] linux-user: syscall: ioctls: support DRM_IOCTL_VERSION

diff --git a/configure b/configure
index e225a1e3ff..2c2c489d1e 100755
--- a/configure
+++ b/configure
@@ -3912,6 +3912,24 @@  EOF
     fi
 fi
 
+#########################################
+# libdrm check
+
+cat > $TMPC << EOF
+#include <libdrm/drm.h>
+#include <sys/ioctl.h>
+int main(void)
+{
+        struct drm_version version;
+        ioctl(-1, DRM_IOCTL_VERSION, &version);
+        return 0;
+}
+EOF
+if ! compile_prog "" ; then
+    error_exit "libdrm check failed" \
+        "Make sure to have the libdrm/drm.h installed."
+fi
+
 ##########################################
 # SHA command probe for modules
 if test "$modules" = yes; then
diff --git a/linux-user/ioctls.h b/linux-user/ioctls.h
index 0defa1d8c1..c2294b48a0 100644
--- a/linux-user/ioctls.h
+++ b/linux-user/ioctls.h
@@ -574,6 +574,9 @@ 
   IOCTL_SPECIAL(SIOCDELRT, IOC_W, do_ioctl_rt,
                 MK_PTR(MK_STRUCT(STRUCT_rtentry)))
 
+  IOCTL_SPECIAL(DRM_IOCTL_VERSION, IOC_RW, do_ioctl_drm,
+                MK_PTR(MK_STRUCT(STRUCT_drm_version)))
+
 #ifdef TARGET_TIOCSTART
   IOCTL_IGNORE(TIOCSTART)
   IOCTL_IGNORE(TIOCSTOP)
diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index 5af55fca78..de2e1e3de4 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -112,6 +112,7 @@ 
 #include <linux/if_alg.h>
 #include <linux/rtc.h>
 #include <sound/asound.h>
+#include <libdrm/drm.h>
 #include "linux_loop.h"
 #include "uname.h"
 
@@ -5275,6 +5276,66 @@  static abi_long do_ioctl_tiocgptpeer(const IOCTLEntry *ie, uint8_t *buf_temp,
 }
 #endif
 
+static inline abi_long target_to_host_drmversion(struct drm_version *host_ver,
+                                                abi_long target_addr)
+{
+    struct target_drm_version *target_ver;
+
+    if (!lock_user_struct(VERIFY_READ, target_ver, target_addr, 0)) {
+        return -TARGET_EFAULT;
+    }
+    __get_user(host_ver->name_len, &target_ver->name_len);
+    host_ver->name = host_ver->name_len ? g2h(target_ver->name) : NULL;
+    __get_user(host_ver->date_len, &target_ver->date_len);
+    host_ver->date = host_ver->date_len ? g2h(target_ver->date) : NULL;
+    __get_user(host_ver->desc_len, &target_ver->desc_len);
+    host_ver->desc = host_ver->desc_len ? g2h(target_ver->desc) : NULL;
+    unlock_user_struct(target_ver, target_addr, 0);
+    return 0;
+}
+
+static inline abi_long host_to_target_drmversion(abi_ulong target_addr,
+                                                 struct drm_version *host_ver)
+{
+    struct target_drm_version *target_ver;
+
+    if (!lock_user_struct(VERIFY_WRITE, target_ver, target_addr, 0)) {
+        return -TARGET_EFAULT;
+    }
+    __put_user(host_ver->version_major, &target_ver->version_major);
+    __put_user(host_ver->version_minor, &target_ver->version_minor);
+    __put_user(host_ver->version_patchlevel, &target_ver->version_patchlevel);
+    __put_user(host_ver->name_len, &target_ver->name_len);
+    __put_user(host_ver->date_len, &target_ver->date_len);
+    __put_user(host_ver->desc_len, &target_ver->desc_len);
+    unlock_user_struct(target_ver, target_addr, 0);
+    return 0;
+}
+
+static abi_long do_ioctl_drm(const IOCTLEntry *ie, uint8_t *buf_temp,
+                             int fd, int cmd, abi_long arg)
+{
+    struct drm_version *ver;
+    abi_long ret;
+
+    switch (ie->host_cmd) {
+    case DRM_IOCTL_VERSION:
+        ver = (struct drm_version *)buf_temp;
+        memset(ver, 0, sizeof(*ver));
+        ret = target_to_host_drmversion(ver, arg);
+        if (is_error(ret)) {
+            return ret;
+        }
+        ret = get_errno(safe_ioctl(fd, ie->host_cmd, ver));
+        if (is_error(ret)) {
+            return ret;
+        }
+        ret = host_to_target_drmversion(arg, ver);
+        return ret;
+    }
+    return -TARGET_EFAULT;
+}
+
 static IOCTLEntry ioctl_entries[] = {
 #define IOCTL(cmd, access, ...) \
     { TARGET_ ## cmd, cmd, #cmd, access, 0, {  __VA_ARGS__ } },
diff --git a/linux-user/syscall_defs.h b/linux-user/syscall_defs.h
index 152ec637cb..3c261cff0e 100644
--- a/linux-user/syscall_defs.h
+++ b/linux-user/syscall_defs.h
@@ -1167,6 +1167,9 @@  struct target_rtc_pll_info {
 #define TARGET_DM_TARGET_MSG          TARGET_IOWRU(0xfd, 0x0e)
 #define TARGET_DM_DEV_SET_GEOMETRY    TARGET_IOWRU(0xfd, 0x0f)
 
+/* drm ioctls */
+#define TARGET_DRM_IOCTL_VERSION      TARGET_IOWRU('d', 0x00)
+
 /* from asm/termbits.h */
 
 #define TARGET_NCC 8
@@ -2598,6 +2601,18 @@  struct target_mq_attr {
     abi_long mq_curmsgs;
 };
 
+struct target_drm_version {
+    int version_major;
+    int version_minor;
+    int version_patchlevel;
+    abi_ulong name_len;
+    abi_ulong name;
+    abi_ulong date_len;
+    abi_ulong date;
+    abi_ulong desc_len;
+    abi_ulong desc;
+};
+
 #include "socket.h"
 
 #include "errno_defs.h"
diff --git a/linux-user/syscall_types.h b/linux-user/syscall_types.h
index 4e12c1661e..e2b0484f50 100644
--- a/linux-user/syscall_types.h
+++ b/linux-user/syscall_types.h
@@ -292,6 +292,17 @@  STRUCT(dm_target_versions,
 STRUCT(dm_target_msg,
        TYPE_ULONGLONG) /* sector */
 
+STRUCT(drm_version,
+       TYPE_INT, /* version_major */
+       TYPE_INT, /* version_minor */
+       TYPE_INT, /* version_patchlevel */
+       TYPE_ULONG, /* name_len */
+       TYPE_PTRVOID, /* name */
+       TYPE_ULONG, /* date_len */
+       TYPE_PTRVOID, /* date */
+       TYPE_ULONG, /* desc_len */
+       TYPE_PTRVOID) /* desc */
+
 STRUCT(file_clone_range,
        TYPE_LONGLONG, /* src_fd */
        TYPE_ULONGLONG, /* src_offset */