1 /*
2  * Copyright 2014 Advanced Micro Devices, Inc.
3  *
4  * Permission is hereby granted, free of charge, to any person obtaining a
5  * copy of this software and associated documentation files (the "Software"),
6  * to deal in the Software without restriction, including without limitation
7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8  * and/or sell copies of the Software, and to permit persons to whom the
9  * Software is furnished to do so, subject to the following conditions:
10  *
11  * The above copyright notice and this permission notice shall be included in
12  * all copies or substantial portions of the Software.
13  *
14  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
17  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
18  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
19  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
20  * OTHER DEALINGS IN THE SOFTWARE.
21  */
22 
23 #include "kfd_priv.h"
24 #include "kfd_events.h"
25 #include "cik_int.h"
26 
27 static bool cik_event_interrupt_isr(struct kfd_dev *dev,
28 					const uint32_t *ih_ring_entry)
29 {
30 	const struct cik_ih_ring_entry *ihre =
31 			(const struct cik_ih_ring_entry *)ih_ring_entry;
32 	unsigned int vmid, pasid;
33 
34 	/* Only handle interrupts from KFD VMIDs */
35 	vmid  = (ihre->ring_id & 0x0000ff00) >> 8;
36 	if (vmid < dev->vm_info.first_vmid_kfd ||
37 	    vmid > dev->vm_info.last_vmid_kfd)
38 		return 0;
39 
40 	/* If there is no valid PASID, it's likely a firmware bug */
41 	pasid = (ihre->ring_id & 0xffff0000) >> 16;
42 	if (WARN_ONCE(pasid == 0, "FW bug: No PASID in KFD interrupt"))
43 		return 0;
44 
45 	/* Interrupt types we care about: various signals and faults.
46 	 * They will be forwarded to a work queue (see below).
47 	 */
48 	return ihre->source_id == CIK_INTSRC_CP_END_OF_PIPE ||
49 		ihre->source_id == CIK_INTSRC_SDMA_TRAP ||
50 		ihre->source_id == CIK_INTSRC_SQ_INTERRUPT_MSG ||
51 		ihre->source_id == CIK_INTSRC_CP_BAD_OPCODE;
52 }
53 
54 static void cik_event_interrupt_wq(struct kfd_dev *dev,
55 					const uint32_t *ih_ring_entry)
56 {
57 	unsigned int pasid;
58 	const struct cik_ih_ring_entry *ihre =
59 			(const struct cik_ih_ring_entry *)ih_ring_entry;
60 	uint32_t context_id = ihre->data & 0xfffffff;
61 
62 	pasid = (ihre->ring_id & 0xffff0000) >> 16;
63 
64 	if (pasid == 0)
65 		return;
66 
67 	if (ihre->source_id == CIK_INTSRC_CP_END_OF_PIPE)
68 		kfd_signal_event_interrupt(pasid, context_id, 28);
69 	else if (ihre->source_id == CIK_INTSRC_SDMA_TRAP)
70 		kfd_signal_event_interrupt(pasid, context_id, 28);
71 	else if (ihre->source_id == CIK_INTSRC_SQ_INTERRUPT_MSG)
72 		kfd_signal_event_interrupt(pasid, context_id & 0xff, 8);
73 	else if (ihre->source_id == CIK_INTSRC_CP_BAD_OPCODE)
74 		kfd_signal_hw_exception_event(pasid);
75 }
76 
77 const struct kfd_event_interrupt_class event_interrupt_class_cik = {
78 	.interrupt_isr = cik_event_interrupt_isr,
79 	.interrupt_wq = cik_event_interrupt_wq,
80 };
81