Currently there's no way to allow a driver to reimplement any ioctls
from the drm core. This can be desirable to, e.g., override fixed format
selection logic, without turning to a midlayer-like solution.
Signed-off-by: Ilia Mirkin <imirkin@xxxxxxxxxxxx>
---
I want drm_mode_addfb to pick a different format for depth=30 than the
one it currently selects. Flipping it for all drivers would break a
bunch of existing ones, so this enables a driver to take control.
Alternatively I can stash something into drm_device which specifies the
preferred depth=30 fb format. However from my cursory observations of
dri-devel discussions, midlayering is seen as a problem and not a
solution.
drivers/gpu/drm/drm_ioctl.c | 36 ++++++++++++++++++++++++------------
include/drm/drm_ioctl.h | 2 ++
2 files changed, 26 insertions(+), 12 deletions(-)
diff --git a/drivers/gpu/drm/drm_ioctl.c b/drivers/gpu/drm/drm_ioctl.c
index 4aafe4802099..698d69c6db0a 100644
--- a/drivers/gpu/drm/drm_ioctl.c
+++ b/drivers/gpu/drm/drm_ioctl.c
@@ -767,12 +767,7 @@ long drm_ioctl(struct file *filp,
struct drm_file *file_priv = filp->private_data;
struct drm_device *dev;
const struct drm_ioctl_desc *ioctl = NULL;
- drm_ioctl_t *func;
unsigned int nr = DRM_IOCTL_NR(cmd);
- int retcode = -EINVAL;
- char stack_kdata[128];
- char *kdata = NULL;
- unsigned int in_size, out_size, drv_size, ksize;
bool is_driver_ioctl;
dev = file_priv->minor->dev;
@@ -784,16 +779,33 @@ long drm_ioctl(struct file *filp,
if (is_driver_ioctl) {
/* driver ioctl */
- if (nr - DRM_COMMAND_BASE >= dev->driver->num_ioctls)
- goto err_i1;
- ioctl = &dev->driver->ioctls[nr - DRM_COMMAND_BASE];
+ if (nr - DRM_COMMAND_BASE < dev->driver->num_ioctls)
+ ioctl = &dev->driver->ioctls[nr - DRM_COMMAND_BASE];
} else {
/* core ioctl */
- if (nr >= DRM_CORE_IOCTL_COUNT)
- goto err_i1;
- ioctl = &drm_ioctls[nr];
+ if (nr < DRM_CORE_IOCTL_COUNT)
+ ioctl = &drm_ioctls[nr];
}
+ return __drm_ioctl(filp, cmd, arg, ioctl);
+}
+EXPORT_SYMBOL(drm_ioctl);
+
+long __drm_ioctl(struct file *filp,
+ unsigned int cmd, unsigned long arg,
+ const struct drm_ioctl_desc *ioctl)
+{
+ struct drm_file *file_priv = filp->private_data;
+ drm_ioctl_t *func;
+ unsigned int nr = DRM_IOCTL_NR(cmd);
+ int retcode = -EINVAL;
+ char stack_kdata[128];
+ char *kdata = NULL;
+ unsigned int in_size, out_size, drv_size, ksize;
+
+ if (!ioctl)
+ goto err_i1;
+
drv_size = _IOC_SIZE(ioctl->cmd);
out_size = in_size = _IOC_SIZE(cmd);
if ((cmd & ioctl->cmd & IOC_IN) == 0)
@@ -851,7 +863,7 @@ long drm_ioctl(struct file *filp,
DRM_DEBUG("ret = %d\n", retcode);
return retcode;
}
-EXPORT_SYMBOL(drm_ioctl);
+EXPORT_SYMBOL(__drm_ioctl);
/**
* drm_ioctl_flags - Check for core ioctl and return ioctl permission flags
diff --git a/include/drm/drm_ioctl.h b/include/drm/drm_ioctl.h
index add42809642a..e08f8ea66f2a 100644
--- a/include/drm/drm_ioctl.h
+++ b/include/drm/drm_ioctl.h
@@ -172,6 +172,8 @@ struct drm_ioctl_desc {
int drm_ioctl_permit(u32 flags, struct drm_file *file_priv);
long drm_ioctl(struct file *filp, unsigned int cmd, unsigned long arg);
+long __drm_ioctl(struct file *filp, unsigned int cmd, unsigned long arg,
+ const struct drm_ioctl_desc *ioctl);
long drm_ioctl_kernel(struct file *, drm_ioctl_t, void *, u32);
#ifdef CONFIG_COMPAT
long drm_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg);
--
2.13.6
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