Revert "drm/radeon: Report doorbell configuration to amdkfd"

This reverts commit ebff8453d3a57a2405c4d96d9f9c4f4acc7d4d79. Unused
since amdkfd is no longer supported with radeon.

Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Michel Dänzer <michel@daenzer.net>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/radeon/radeon.h

@@ -731,10 +731,6 @@ struct radeon_doorbell {
 
 int radeon_doorbell_get(struct radeon_device *rdev, u32 *page);
 void radeon_doorbell_free(struct radeon_device *rdev, u32 doorbell);
-void radeon_doorbell_get_kfd_info(struct radeon_device *rdev,
-				  phys_addr_t *aperture_base,
-				  size_t *aperture_size,
-				  size_t *start_offset);
 
 /*
  * IRQS.

drivers/gpu/drm/radeon/radeon_device.c

@@ -392,37 +392,6 @@ void radeon_doorbell_free(struct radeon_device *rdev, u32 doorbell)
 		__clear_bit(doorbell, rdev->doorbell.used);
 }
 
-/**
- * radeon_doorbell_get_kfd_info - Report doorbell configuration required to
- *                                setup KFD
- *
- * @rdev: radeon_device pointer
- * @aperture_base: output returning doorbell aperture base physical address
- * @aperture_size: output returning doorbell aperture size in bytes
- * @start_offset: output returning # of doorbell bytes reserved for radeon.
- *
- * Radeon and the KFD share the doorbell aperture. Radeon sets it up,
- * takes doorbells required for its own rings and reports the setup to KFD.
- * Radeon reserved doorbells are at the start of the doorbell aperture.
- */
-void radeon_doorbell_get_kfd_info(struct radeon_device *rdev,
-				  phys_addr_t *aperture_base,
-				  size_t *aperture_size,
-				  size_t *start_offset)
-{
-	/* The first num_doorbells are used by radeon.
-	 * KFD takes whatever's left in the aperture. */
-	if (rdev->doorbell.size > rdev->doorbell.num_doorbells * sizeof(u32)) {
-		*aperture_base = rdev->doorbell.base;
-		*aperture_size = rdev->doorbell.size;
-		*start_offset = rdev->doorbell.num_doorbells * sizeof(u32);
-	} else {
-		*aperture_base = 0;
-		*aperture_size = 0;
-		*start_offset = 0;
-	}
-}
-
 /*
  * radeon_wb_*()
  * Writeback is the the method by which the the GPU updates special pages