/**
* IRQ control ioctl.
*
* \param inode device inode.
* \param file_priv DRM file private.
* \param cmd command.
* \param arg user argument, pointing to a drm_control structure.
* \return zero on success or a negative number on failure.
*
* Calls irq_install() or irq_uninstall() according to \p arg.
*/
int drm_control(struct drm_device *dev, void *data,
struct drm_file *file_priv)
{
struct drm_control *ctl = data;
/* Handle drivers who used to require IRQ setup no longer does. */
if (!(dev->driver->flags & DRIVER_IRQ))
return (0);
switch (ctl->func) {
case DRM_INST_HANDLER:
if (drm_core_check_feature(dev, DRIVER_MODESET))
return 0;
if (dev->if_version < DRM_IF_VERSION(1, 2) &&
ctl->irq != dev->irq)
return (EINVAL);
return (drm_irq_install(dev));
case DRM_UNINST_HANDLER:
if (drm_core_check_feature(dev, DRIVER_MODESET))
return 0;
return (drm_irq_uninstall(dev));
default:
return (EINVAL);
}
}
/*
* Setversion ioctl.
*
* \param inode device inode.
* \param file_priv DRM file private.
* \param cmd command.
* \param arg user argument, pointing to a drm_lock structure.
* \return zero on success or negative number on failure.
*
* Sets the requested interface version
*/
static int drm_setversion(struct drm_device *dev, void *data, struct drm_file *file_priv)
{
struct drm_set_version *sv = data;
int if_version, retcode = 0;
mutex_lock(&dev->master_mutex);
if (sv->drm_di_major != -1) {
if (sv->drm_di_major != DRM_IF_MAJOR ||
sv->drm_di_minor < 0 || sv->drm_di_minor > DRM_IF_MINOR) {
retcode = -EINVAL;
goto done;
}
if_version = DRM_IF_VERSION(sv->drm_di_major,
sv->drm_di_minor);
dev->if_version = max(if_version, dev->if_version);
if (sv->drm_di_minor >= 1) {
/*
* Version 1.1 includes tying of DRM to specific device
* Version 1.4 has proper PCI domain support
*/
retcode = drm_set_busid(dev, file_priv);
if (retcode)
goto done;
}
}
if (sv->drm_dd_major != -1) {
if (sv->drm_dd_major != dev->driver->major ||
sv->drm_dd_minor < 0 || sv->drm_dd_minor >
dev->driver->minor) {
retcode = -EINVAL;
goto done;
}
}
done:
sv->drm_di_major = DRM_IF_MAJOR;
sv->drm_di_minor = DRM_IF_MINOR;
sv->drm_dd_major = dev->driver->major;
sv->drm_dd_minor = dev->driver->minor;
mutex_unlock(&dev->master_mutex);
return retcode;
}
int drm_legacy_irq_control(struct drm_device *dev, void *data,
struct drm_file *file_priv)
{
struct drm_control *ctl = data;
int ret = 0, irq;
/* if we haven't irq we fallback for compatibility reasons -
* this used to be a separate function in drm_dma.h
*/
if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
return 0;
if (!drm_core_check_feature(dev, DRIVER_LEGACY))
return 0;
/* UMS was only ever supported on pci devices. */
if (WARN_ON(!dev->pdev))
return -EINVAL;
switch (ctl->func) {
case DRM_INST_HANDLER:
irq = dev->pdev->irq;
if (dev->if_version < DRM_IF_VERSION(1, 2) &&
ctl->irq != irq)
return -EINVAL;
mutex_lock(&dev->struct_mutex);
ret = drm_irq_install(dev, irq);
mutex_unlock(&dev->struct_mutex);
return ret;
case DRM_UNINST_HANDLER:
mutex_lock(&dev->struct_mutex);
ret = drm_irq_uninstall(dev);
mutex_unlock(&dev->struct_mutex);
return ret;
default:
return -EINVAL;
}
}
