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      1 /*	$NetBSD: kfd_kernel_queue.h,v 1.3 2021/12/18 23:44:59 riastradh Exp $	*/
      2 
      3 /*
      4  * Copyright 2014 Advanced Micro Devices, Inc.
      5  *
      6  * Permission is hereby granted, free of charge, to any person obtaining a
      7  * copy of this software and associated documentation files (the "Software"),
      8  * to deal in the Software without restriction, including without limitation
      9  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
     10  * and/or sell copies of the Software, and to permit persons to whom the
     11  * Software is furnished to do so, subject to the following conditions:
     12  *
     13  * The above copyright notice and this permission notice shall be included in
     14  * all copies or substantial portions of the Software.
     15  *
     16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
     17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
     18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
     19  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
     20  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
     21  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
     22  * OTHER DEALINGS IN THE SOFTWARE.
     23  *
     24  */
     25 
     26 #ifndef KFD_KERNEL_QUEUE_H_
     27 #define KFD_KERNEL_QUEUE_H_
     28 
     29 #include <linux/list.h>
     30 #include <linux/types.h>
     31 #include "kfd_priv.h"
     32 
     33 /**
     34  * kq_acquire_packet_buffer: Returns a pointer to the location in the kernel
     35  * queue ring buffer where the calling function can write its packet. It is
     36  * Guaranteed that there is enough space for that packet. It also updates the
     37  * pending write pointer to that location so subsequent calls to
     38  * acquire_packet_buffer will get a correct write pointer
     39  *
     40  * kq_submit_packet: Update the write pointer and doorbell of a kernel queue.
     41  *
     42  * kq_rollback_packet: This routine is called if we failed to build an acquired
     43  * packet for some reason. It just overwrites the pending wptr with the current
     44  * one
     45  *
     46  */
     47 
     48 int kq_acquire_packet_buffer(struct kernel_queue *kq,
     49 				size_t packet_size_in_dwords,
     50 				unsigned int **buffer_ptr);
     51 void kq_submit_packet(struct kernel_queue *kq);
     52 void kq_rollback_packet(struct kernel_queue *kq);
     53 
     54 
     55 struct kernel_queue {
     56 	/* data */
     57 	struct kfd_dev		*dev;
     58 	struct mqd_manager	*mqd_mgr;
     59 	struct queue		*queue;
     60 	uint64_t		pending_wptr64;
     61 	uint32_t		pending_wptr;
     62 	unsigned int		nop_packet;
     63 
     64 	struct kfd_mem_obj	*rptr_mem;
     65 	uint32_t		*rptr_kernel;
     66 	uint64_t		rptr_gpu_addr;
     67 	struct kfd_mem_obj	*wptr_mem;
     68 	union {
     69 		uint64_t	*wptr64_kernel;
     70 		uint32_t	*wptr_kernel;
     71 	};
     72 	uint64_t		wptr_gpu_addr;
     73 	struct kfd_mem_obj	*pq;
     74 	uint64_t		pq_gpu_addr;
     75 	uint32_t		*pq_kernel_addr;
     76 	struct kfd_mem_obj	*eop_mem;
     77 	uint64_t		eop_gpu_addr;
     78 	uint32_t		*eop_kernel_addr;
     79 
     80 	struct kfd_mem_obj	*fence_mem_obj;
     81 	uint64_t		fence_gpu_addr;
     82 	void			*fence_kernel_address;
     83 
     84 	struct list_head	list;
     85 };
     86 
     87 #endif /* KFD_KERNEL_QUEUE_H_ */
     88