RADEON_MAX_DOORBELLS
ring_cp1->doorbell_index = RADEON_MAX_DOORBELLS;
ring_cp2->doorbell_index = RADEON_MAX_DOORBELLS;
ring_cp1->doorbell_index = RADEON_MAX_DOORBELLS;
ring_cp2->doorbell_index = RADEON_MAX_DOORBELLS;
DECLARE_BITMAP(used, RADEON_MAX_DOORBELLS);
rdev->doorbell.num_doorbells = min_t(u32, rdev->doorbell.size / sizeof(u32), RADEON_MAX_DOORBELLS);