[v3,3/5] drm: Add dispatcher and driver identification for DRM

Submitted by Patrik Jakobsson on July 1, 2015, 12:52 p.m.

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Message ID 1435755168-16207-4-git-send-email-patrik.jakobsson@linux.intel.com
State New
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Commit Message

Patrik Jakobsson July 1, 2015, 12:52 p.m.
* Makefile.am: Add compilation of drm.c
* defs.h: Declarations of drm functions
* drm.c: Utility functions for drm driver detection
* io.c: Dispatch drm ioctls
* ioctl.c: Distpatch generic and driver specific ioctls

Signed-off-by: Patrik Jakobsson <patrik.jakobsson@linux.intel.com>
---
 Makefile.am |   1 +
 defs.h      |   4 ++-
 drm.c       | 108 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 io.c        |   2 +-
 ioctl.c     |   6 +++-
 5 files changed, 118 insertions(+), 3 deletions(-)
 create mode 100644 drm.c

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diff --git a/Makefile.am b/Makefile.am
index e2a0f74..99382bd 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -41,6 +41,7 @@  strace_SOURCES =	\
 	count.c		\
 	desc.c		\
 	dirent.c	\
+	drm.c		\
 	evdev.c		\
 	execve.c	\
 	exit.c		\
diff --git a/defs.h b/defs.h
index 5b0670e..63e4585 100644
--- a/defs.h
+++ b/defs.h
@@ -573,8 +573,10 @@  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 drm_decode_number(struct tcb *tcp, unsigned int arg);
+extern int drm_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);
 extern int mtd_ioctl(struct tcb *, const unsigned int, long);
diff --git a/drm.c b/drm.c
new file mode 100644
index 0000000..61df09f
--- /dev/null
+++ b/drm.c
@@ -0,0 +1,108 @@ 
+/*
+ * 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@linux.intel.com>
+ */
+
+#include "defs.h"
+
+#include <drm.h>
+#include <linux/limits.h>
+
+#define DRM_MAX_NAME_LEN 128
+
+struct drm_ioctl_priv {
+	char name[DRM_MAX_NAME_LEN];
+};
+
+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 < 0)
+		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)
+{
+	struct drm_ioctl_priv *priv;
+	int ret;
+
+	/*
+	 * If no private data is allocated we are detecting the driver name for
+	 * the first time and must resolve it.
+	 */
+	if (tcp->priv_data == NULL) {
+		tcp->priv_data = xcalloc(1, sizeof(struct drm_ioctl_priv));
+		priv = tcp->priv_data;
+
+		ret = drm_get_driver_name(tcp, priv->name, DRM_MAX_NAME_LEN);
+		if (ret)
+			return 0;
+	}
+
+	priv = tcp->priv_data;
+
+	return strncmp(name, priv->name, DRM_MAX_NAME_LEN) == 0;
+}
+
+int drm_decode_number(struct tcb *tcp, unsigned int arg)
+{
+	return 0;
+}
+
+int drm_ioctl(struct tcb *tcp, const unsigned int code, long arg)
+{
+	/* Free any allocated private data */
+	if (exiting(tcp) && tcp->priv_data != NULL) {
+		free(tcp->priv_data);
+		tcp->priv_data = NULL;
+	}
+
+	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..0b3dd3f 100644
--- a/ioctl.c
+++ b/ioctl.c
@@ -182,7 +182,7 @@  hiddev_decode_number(unsigned int arg)
 }
 
 int
-ioctl_decode_command_number(unsigned int arg)
+ioctl_decode_command_number(struct tcb *tcp, unsigned int arg)
 {
 	switch (_IOC_TYPE(arg)) {
 		case 'E':
@@ -204,6 +204,8 @@  ioctl_decode_command_number(unsigned int arg)
 				return 1;
 			}
 			return 0;
+		case 'd':
+			return drm_decode_number(tcp, arg);
 		case 'j':
 			if (_IOC_DIR(arg) == _IOC_READ && _IOC_NR(arg) == 0x13) {
 				tprintf("JSIOCGNAME(%u)", _IOC_SIZE(arg));
@@ -243,6 +245,8 @@  ioctl_decode(struct tcb *tcp, unsigned int code, long arg)
 	case 0x22:
 		return scsi_ioctl(tcp, code, arg);
 #endif
+	case 'd':
+		return drm_ioctl(tcp, code, arg);
 	case 'L':
 		return loop_ioctl(tcp, code, arg);
 	case 'M':