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Let's utilize full minor range for DRM devices. To avoid regressing the existing userspace, we're still maintaining the numbering scheme where 0-63 is used for primary, 64-127 is reserved (formerly for control) and 128-191 is used for render. For minors >= 192, we're allocating minors dynamically on a first-come, first-served basis. Signed-off-by: Michał Winiarski --- drivers/gpu/drm/drm_drv.c | 13 +++++++++++-- 1 file changed, 11 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/drm_drv.c b/drivers/gpu/drm/drm_drv.c index 61d24cdcd0f8..3718bd6bbef6 100644 --- a/drivers/gpu/drm/drm_drv.c +++ b/drivers/gpu/drm/drm_drv.c @@ -106,7 +106,8 @@ static void drm_minor_alloc_release(struct drm_device *dev, void *data) xa_erase(&drm_minors_xa, minor->index); } -#define DRM_MINOR_LIMIT(t) ({ typeof(t) _t = (t); XA_LIMIT(64 * _t, 64 * _t + 63); }) +#define DRM_LEGACY_MINOR_LIMIT(t) ({ typeof(t) _t = (t); XA_LIMIT(64 * _t, 64 * _t + 63); }) +#define DRM_MINOR_LIMIT XA_LIMIT(192, (1 << MINORBITS) - 1) static int drm_minor_alloc(struct drm_device *dev, unsigned int type) { @@ -120,7 +121,15 @@ static int drm_minor_alloc(struct drm_device *dev, unsigned int type) minor->type = type; minor->dev = dev; - r = xa_alloc(&drm_minors_xa, &minor->index, NULL, DRM_MINOR_LIMIT(type), GFP_KERNEL); + /* + * DRM used to support 64 devices, for backwards compatibility we need to maintain the + * minor allocation scheme where minors 0-63 are primary nodes, 64-127 are control nodes, + * and 128-191 are render nodes. + * After reaching the limit, we're allocating minors dynamically - first-come, first-serve. + */ + r = xa_alloc(&drm_minors_xa, &minor->index, NULL, DRM_LEGACY_MINOR_LIMIT(type), GFP_KERNEL); + if (r == -EBUSY) + r = xa_alloc(&drm_minors_xa, &minor->index, NULL, DRM_MINOR_LIMIT, GFP_KERNEL); if (r < 0) return r;