drm/drm_ioctl.c: kerneldoc
As usual pull it into the drm docbook template, too. And again as
usual I've decided to only document stuff exported to drivers, so all
the old leftover markup from the shared drm repo days lost the magic
** signature.
Reviewed-by: David Herrmann <dh.herrmann@gmail.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
diff --git a/drivers/gpu/drm/drm_ioctl.c b/drivers/gpu/drm/drm_ioctl.c
index f1c8a15..530c501 100644
--- a/drivers/gpu/drm/drm_ioctl.c
+++ b/drivers/gpu/drm/drm_ioctl.c
@@ -40,7 +40,7 @@
static int drm_version(struct drm_device *dev, void *data,
struct drm_file *file_priv);
-/**
+/*
* Get the bus id.
*
* \param inode device inode.
@@ -75,7 +75,7 @@
master->unique_len = 0;
}
-/**
+/*
* Set the bus id.
*
* \param inode device inode.
@@ -149,7 +149,7 @@
return 0;
}
-/**
+/*
* Get a mapping information.
*
* \param inode device inode.
@@ -201,7 +201,7 @@
return 0;
}
-/**
+/*
* Get client information.
*
* \param inode device inode.
@@ -244,7 +244,7 @@
}
}
-/**
+/*
* Get statistics information.
*
* \param inode device inode.
@@ -265,7 +265,7 @@
return 0;
}
-/**
+/*
* Get device/driver capabilities
*/
static int drm_getcap(struct drm_device *dev, void *data, struct drm_file *file_priv)
@@ -318,7 +318,7 @@
return 0;
}
-/**
+/*
* Set device/driver capabilities
*/
static int
@@ -352,7 +352,7 @@
return 0;
}
-/**
+/*
* Setversion ioctl.
*
* \param inode device inode.
@@ -406,7 +406,18 @@
return retcode;
}
-/** No-op ioctl. */
+/**
+ * drm_noop - DRM no-op ioctl implemntation
+ * @dev: DRM device for the ioctl
+ * @data: data pointer for the ioctl
+ * @file_priv: DRM file for the ioctl call
+ *
+ * This no-op implementation for drm ioctls is useful for deprecated
+ * functionality where we can't return a failure code because existing userspace
+ * checks the result of the ioctl, but doesn't care about the action.
+ *
+ * Always returns successfully with 0.
+ */
int drm_noop(struct drm_device *dev, void *data,
struct drm_file *file_priv)
{
@@ -415,6 +426,21 @@
}
EXPORT_SYMBOL(drm_noop);
+/**
+ * drm_invalid_op - DRM invalid ioctl implemntation
+ * @dev: DRM device for the ioctl
+ * @data: data pointer for the ioctl
+ * @file_priv: DRM file for the ioctl call
+ *
+ * This no-op implementation for drm ioctls is useful for deprecated
+ * functionality where we really don't want to allow userspace to call the ioctl
+ * any more. This is the case for old ums interfaces for drivers that
+ * transitioned to kms gradually and so kept the old legacy tables around. This
+ * only applies to radeon and i915 kms drivers, other drivers shouldn't need to
+ * use this function.
+ *
+ * Always fails with a return value of -EINVAL.
+ */
int drm_invalid_op(struct drm_device *dev, void *data,
struct drm_file *file_priv)
{
@@ -422,7 +448,7 @@
}
EXPORT_SYMBOL(drm_invalid_op);
-/**
+/*
* Copy and IOCTL return string to user space
*/
static int drm_copy_field(char __user *buf, size_t *buf_len, const char *value)
@@ -445,7 +471,7 @@
return 0;
}
-/**
+/*
* Get version information
*
* \param inode device inode.
@@ -477,7 +503,7 @@
return err;
}
-/**
+/*
* drm_ioctl_permit - Check ioctl permissions against caller
*
* @flags: ioctl permission flags.
@@ -525,7 +551,7 @@
.name = #ioctl \
}
-/** Ioctl table */
+/* Ioctl table */
static const struct drm_ioctl_desc drm_ioctls[] = {
DRM_IOCTL_DEF(DRM_IOCTL_VERSION, drm_version,
DRM_UNLOCKED|DRM_RENDER_ALLOW|DRM_CONTROL_ALLOW),
@@ -642,16 +668,16 @@
#define DRM_CORE_IOCTL_COUNT ARRAY_SIZE( drm_ioctls )
/**
- * Called whenever a process performs an ioctl on /dev/drm.
- *
- * \param inode device inode.
- * \param file_priv DRM file private.
- * \param cmd command.
- * \param arg user argument.
- * \return zero on success or negative number on failure.
+ * drm_ioctl - ioctl callback implementation for DRM drivers
+ * @filp: file this ioctl is called on
+ * @cmd: ioctl cmd number
+ * @arg: user argument
*
* Looks up the ioctl function in the ::ioctls table, checking for root
* previleges if so required, and dispatches to the respective function.
+ *
+ * Returns:
+ * Zero on success, negative error code on failure.
*/
long drm_ioctl(struct file *filp,
unsigned int cmd, unsigned long arg)
@@ -761,9 +787,15 @@
/**
* drm_ioctl_flags - Check for core ioctl and return ioctl permission flags
+ * @nr: ioctl number
+ * @flags: where to return the ioctl permission flags
*
- * @nr: Ioctl number.
- * @flags: Where to return the ioctl permission flags
+ * This ioctl is only used by the vmwgfx driver to augment the access checks
+ * done by the drm core and insofar a pretty decent layering violation. This
+ * shouldn't be used by any drivers.
+ *
+ * Returns:
+ * True if the @nr corresponds to a DRM core ioctl numer, false otherwise.
*/
bool drm_ioctl_flags(unsigned int nr, unsigned int *flags)
{