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      1 /*	$NetBSD: kfd_events.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 #ifndef KFD_EVENTS_H_INCLUDED
     26 #define KFD_EVENTS_H_INCLUDED
     27 
     28 #include <linux/kernel.h>
     29 #include <linux/hashtable.h>
     30 #include <linux/types.h>
     31 #include <linux/list.h>
     32 #include <linux/wait.h>
     33 #include "kfd_priv.h"
     34 #include <uapi/linux/kfd_ioctl.h>
     35 
     36 /*
     37  * IDR supports non-negative integer IDs. Small IDs are used for
     38  * signal events to match their signal slot. Use the upper half of the
     39  * ID space for non-signal events.
     40  */
     41 #define KFD_FIRST_NONSIGNAL_EVENT_ID ((INT_MAX >> 1) + 1)
     42 #define KFD_LAST_NONSIGNAL_EVENT_ID INT_MAX
     43 
     44 /*
     45  * Written into kfd_signal_slot_t to indicate that the event is not signaled.
     46  * Since the event protocol may need to write the event ID into memory, this
     47  * must not be a valid event ID.
     48  * For the sake of easy memset-ing, this must be a byte pattern.
     49  */
     50 #define UNSIGNALED_EVENT_SLOT ((uint64_t)-1)
     51 
     52 struct kfd_event_waiter;
     53 struct signal_page;
     54 
     55 struct kfd_event {
     56 	u32 event_id;
     57 
     58 	bool signaled;
     59 	bool auto_reset;
     60 
     61 	int type;
     62 
     63 	wait_queue_head_t wq; /* List of event waiters. */
     64 
     65 	/* Only for signal events. */
     66 	uint64_t __user *user_signal_address;
     67 
     68 	/* type specific data */
     69 	union {
     70 		struct kfd_hsa_memory_exception_data memory_exception_data;
     71 		struct kfd_hsa_hw_exception_data hw_exception_data;
     72 	};
     73 };
     74 
     75 #define KFD_EVENT_TIMEOUT_IMMEDIATE 0
     76 #define KFD_EVENT_TIMEOUT_INFINITE 0xFFFFFFFFu
     77 
     78 /* Matching HSA_EVENTTYPE */
     79 #define KFD_EVENT_TYPE_SIGNAL 0
     80 #define KFD_EVENT_TYPE_HW_EXCEPTION 3
     81 #define KFD_EVENT_TYPE_DEBUG 5
     82 #define KFD_EVENT_TYPE_MEMORY 8
     83 
     84 extern void kfd_signal_event_interrupt(unsigned int pasid, uint32_t partial_id,
     85 					uint32_t valid_id_bits);
     86 
     87 #endif
     88