[PATCH 2/4] drm: Add dispatcher and driver identification for DRM

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Signed-off-by: Patrik Jakobsson <patrik.jakobsson@xxxxxxxxxxxxxxx>
---
 Makefile.am |  1 +
 defs.h      |  6 ++++-
 drm.c       | 88 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 io.c        |  2 +-
 ioctl.c     | 13 ++++++++-
 5 files changed, 107 insertions(+), 3 deletions(-)
 create mode 100644 drm.c

diff --git a/Makefile.am b/Makefile.am
index 549aebc..50d5140 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -121,6 +121,7 @@ strace_SOURCES =	\
 	utime.c		\
 	utimes.c	\
 	v4l2.c		\
+	drm.c		\
 	vsprintf.c	\
 	wait.c		\
 	xattr.c
diff --git a/defs.h b/defs.h
index 77c819c..f77330b 100644
--- a/defs.h
+++ b/defs.h
@@ -559,7 +559,7 @@ extern const struct_ioctlent *ioctl_lookup(const unsigned int);
 extern const struct_ioctlent *ioctl_next_match(const struct_ioctlent *);
 extern void ioctl_print_code(const unsigned int);
 extern int ioctl_decode(struct tcb *, const unsigned int, long);
-extern int ioctl_decode_command_number(const unsigned int);
+extern int ioctl_decode_command_number(struct tcb *, const unsigned int);
 extern int block_ioctl(struct tcb *, const unsigned int, long);
 extern int evdev_ioctl(struct tcb *, const unsigned int, long);
 extern int loop_ioctl(struct tcb *, const unsigned int, long);
@@ -572,6 +572,10 @@ extern int term_ioctl(struct tcb *, const unsigned int, long);
 extern int ubi_ioctl(struct tcb *, const unsigned int, long);
 extern int v4l2_ioctl(struct tcb *, const unsigned int, long);
 
+extern int drm_is_priv(const unsigned int);
+extern int drm_is_driver(struct tcb *tcp, const char *name);
+extern int drm_ioctl(struct tcb *, const unsigned int, long);
+
 extern int tv_nz(const struct timeval *);
 extern int tv_cmp(const struct timeval *, const struct timeval *);
 extern double tv_float(const struct timeval *);
diff --git a/drm.c b/drm.c
new file mode 100644
index 0000000..56ef98b
--- /dev/null
+++ b/drm.c
@@ -0,0 +1,88 @@
+/*
+ * Copyright (c) 2015 Intel Corporation
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * Authors:
+ *    Patrik Jakobsson <patrik.jakobsson@xxxxxxxxxxxxxxx>
+ */
+
+#include "defs.h"
+
+#include <sys/types.h>
+#include <unistd.h>
+#include <string.h>
+#include <linux/limits.h>
+#include <stdint.h>
+#include <sys/ioctl.h>
+#include <linux/types.h>
+#include <drm.h>
+
+#define DRM_MAX_NAME_LEN 128
+
+inline int drm_is_priv(const unsigned int num)
+{
+	return (_IOC_NR(num) >= DRM_COMMAND_BASE &&
+		_IOC_NR(num) < DRM_COMMAND_END);
+}
+
+static int drm_get_driver_name(struct tcb *tcp, char *name, size_t bufsize)
+{
+	char path[PATH_MAX];
+	char link[PATH_MAX];
+	int ret;
+
+	ret = getfdpath(tcp, tcp->u_arg[0], path, PATH_MAX - 1);
+	if (!ret)
+		return ret;
+
+	snprintf(link, PATH_MAX, "/sys/class/drm/%s/device/driver",
+		 basename(path));
+
+	ret = readlink(link, path, PATH_MAX - 1);
+	if (ret < 0)
+		return ret;
+
+	path[ret] = '\0';
+	strncpy(name, basename(path), bufsize);
+
+	return 0;
+}
+
+int drm_is_driver(struct tcb *tcp, const char *name)
+{
+	char drv[DRM_MAX_NAME_LEN];
+	int ret;
+
+	ret = drm_get_driver_name(tcp, drv, DRM_MAX_NAME_LEN);
+	if (ret)
+		return 0;
+
+	return strcmp(name, drv) == 0;
+}
+
+int drm_ioctl(struct tcb *tcp, const unsigned int code, long arg)
+{
+	return 0;
+}
diff --git a/io.c b/io.c
index 30ed578..6810a45 100644
--- a/io.c
+++ b/io.c
@@ -391,7 +391,7 @@ SYS_FUNC(ioctl)
 	if (entering(tcp)) {
 		printfd(tcp, tcp->u_arg[0]);
 		tprints(", ");
-		if (!ioctl_decode_command_number(tcp->u_arg[1])) {
+		if (!ioctl_decode_command_number(tcp, tcp->u_arg[1])) {
 			iop = ioctl_lookup(tcp->u_arg[1]);
 			if (iop) {
 				tprints(iop->symbol);
diff --git a/ioctl.c b/ioctl.c
index c67d048..690e7aa 100644
--- a/ioctl.c
+++ b/ioctl.c
@@ -181,8 +181,14 @@ hiddev_decode_number(unsigned int arg)
 	return 0;
 }
 
+static int
+drm_decode_number(struct tcb *tcp, unsigned int arg)
+{
+	return 0;
+}
+
 int
-ioctl_decode_command_number(unsigned int arg)
+ioctl_decode_command_number(struct tcb *tcp, unsigned int arg)
 {
 	switch (_IOC_TYPE(arg)) {
 		case 'E':
@@ -216,6 +222,8 @@ ioctl_decode_command_number(unsigned int arg)
 				return 1;
 			}
 			return 0;
+		case 'd':
+			return drm_decode_number(tcp, arg);
 		default:
 			return 0;
 	}
@@ -252,6 +260,8 @@ ioctl_decode(struct tcb *tcp, unsigned int code, long arg)
 		return ubi_ioctl(tcp, code, arg);
 	case 'V':
 		return v4l2_ioctl(tcp, code, arg);
+	case 'd':
+		return drm_ioctl(tcp, code, arg);
 	case '=':
 		return ptp_ioctl(tcp, code, arg);
 #ifdef HAVE_LINUX_INPUT_H
@@ -284,6 +294,7 @@ ioctl_decode(struct tcb *tcp, unsigned int code, long arg)
  *   d	sys/des.h			(possible overlap)
  *   d	vax/dkio.h			(possible overlap)
  *   d	vaxuba/rxreg.h			(possible overlap)
+ *   d  drm/drm.h
  *   f	sys/filio.h
  *   g	sunwindow/win_ioctl.h		-no overlap-
  *   g	sunwindowdev/winioctl.c		!no manifest constant! -no overlap-
-- 
2.1.0

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