1 files changed, 94 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/i915_ioc32.c b/drivers/gpu/drm/i915/i915_ioc32.c
new file mode 100644
index 000000000..33348960f
--- /dev/null
+++ b/drivers/gpu/drm/i915/i915_ioc32.c
@@ -0,0 +1,94 @@
+/*
+ * 32-bit ioctl compatibility routines for the i915 DRM.
+ *
+ * Copyright (C) Paul Mackerras 2005
+ * Copyright (C) Alan Hourihane 2005
+ * All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHOR BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ *
+ * Author: Alan Hourihane <alanh@fairlite.demon.co.uk>
+ */
+#include <linux/compat.h>
+
+#include <drm/drm_ioctl.h>
+
+#include "i915_drv.h"
+#include "i915_getparam.h"
+#include "i915_ioc32.h"
+
+struct drm_i915_getparam32 {
+	s32 param;
+	/*
+	 * We screwed up the generic ioctl struct here and used a variable-sized
+	 * pointer. Use u32 in the compat struct to match the 32bit pointer
+	 * userspace expects.
+	 */
+	u32 value;
+};
+
+static int compat_i915_getparam(struct file *file, unsigned int cmd,
+				unsigned long arg)
+{
+	struct drm_i915_getparam32 req32;
+	struct drm_i915_getparam req;
+
+	if (copy_from_user(&req32, (void __user *)arg, sizeof(req32)))
+		return -EFAULT;
+
+	req.param = req32.param;
+	req.value = compat_ptr(req32.value);
+
+	return drm_ioctl_kernel(file, i915_getparam_ioctl, &req,
+				DRM_RENDER_ALLOW);
+}
+
+static drm_ioctl_compat_t *i915_compat_ioctls[] = {
+	[DRM_I915_GETPARAM] = compat_i915_getparam,
+};
+
+/**
+ * i915_ioc32_compat_ioctl - handle the mistakes of the past
+ * @filp: the file pointer
+ * @cmd: the ioctl command (and encoded flags)
+ * @arg: the ioctl argument (from userspace)
+ *
+ * Called whenever a 32-bit process running under a 64-bit kernel
+ * performs an ioctl on /dev/dri/card<n>.
+ */
+long i915_ioc32_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
+{
+	unsigned int nr = DRM_IOCTL_NR(cmd);
+	drm_ioctl_compat_t *fn = NULL;
+	int ret;
+
+	if (nr < DRM_COMMAND_BASE || nr >= DRM_COMMAND_END)
+		return drm_compat_ioctl(filp, cmd, arg);
+
+	if (nr < DRM_COMMAND_BASE + ARRAY_SIZE(i915_compat_ioctls))
+		fn = i915_compat_ioctls[nr - DRM_COMMAND_BASE];
+
+	if (fn != NULL)
+		ret = (*fn) (filp, cmd, arg);
+	else
+		ret = drm_ioctl(filp, cmd, arg);
+
+	return ret;
+}