amd/amdkfd/kfd_doorbell.c

31  * This extension supports a kernel level doorbells management for the
38  * The doorbells are intended to be written by applications as part
40  * We assign doorbells to applications in PAGE_SIZE-sized and aligned chunks.
46  * offsets (KFD_MMAP_DOORBELL_START-END) is used for doorbells.
74 	/* Bitmap to dynamically allocate doorbells from kernel page */
86 				    &kfd->doorbells,
90 		pr_err("failed to allocate kernel doorbells\n");
102 	amdgpu_bo_free_kernel(&kfd->doorbells, NULL,
165 						     kfd->doorbells,
218 	/* Mask out doorbells reserved for SDMA, IH, and VCN on SOC15. */
268 		DRM_ERROR("Failed to initialize process doorbells\n");
273 	/* Allocate doorbells for this process */
282 		DRM_ERROR("Failed to allocate process doorbells\n");