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Add a modparam to simplify testing and development of >64 devices support on userspace side by allocating minors from the >=192 range (without the need of having >64 physical devices connected). Signed-off-by: Michał Winiarski --- drivers/gpu/drm/drm_drv.c | 12 +++++++++--- 1 file changed, 9 insertions(+), 3 deletions(-) diff --git a/drivers/gpu/drm/drm_drv.c b/drivers/gpu/drm/drm_drv.c index c2c6e80e6b31..ef6d7b498784 100644 --- a/drivers/gpu/drm/drm_drv.c +++ b/drivers/gpu/drm/drm_drv.c @@ -57,6 +57,11 @@ MODULE_LICENSE("GPL and additional rights"); DEFINE_XARRAY_ALLOC(drm_minors_xa); +static bool force_extended_minors; +module_param_unsafe(force_extended_minors, bool, 0400); +MODULE_PARM_DESC(force_extended_minors, + "Don't allocate minors in 0-192 range. This can be used for testing userspace support for >64 drm devices (default: false)"); + /* * If the drm core fails to init for whatever reason, * we should prevent any drivers from registering with it. @@ -138,7 +143,7 @@ static void drm_minor_alloc_release(struct drm_device *dev, void *data) static int drm_minor_alloc(struct drm_device *dev, enum drm_minor_type type) { struct drm_minor *minor; - int r; + int r = -EBUSY; minor = drmm_kzalloc(dev, sizeof(*minor), GFP_KERNEL); if (!minor) @@ -147,8 +152,9 @@ static int drm_minor_alloc(struct drm_device *dev, enum drm_minor_type type) minor->type = type; minor->dev = dev; - r = xa_alloc(drm_minor_get_xa(type), &minor->index, - NULL, DRM_MINOR_LIMIT(type), GFP_KERNEL); + if (type == DRM_MINOR_ACCEL || !force_extended_minors) + r = xa_alloc(drm_minor_get_xa(type), &minor->index, + NULL, DRM_MINOR_LIMIT(type), GFP_KERNEL); if (r == -EBUSY && (type == DRM_MINOR_PRIMARY || type == DRM_MINOR_RENDER)) r = xa_alloc(&drm_minors_xa, &minor->index, NULL, DRM_EXTENDED_MINOR_LIMIT, GFP_KERNEL);