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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
24#include <drm/drmP.h>
25#include "amdgpu.h"
26#include "amdgpu_ih.h"
27#include "amdgpu_amdkfd.h"
28
29/**
30 * amdgpu_ih_ring_alloc - allocate memory for the IH ring
31 *
32 * @adev: amdgpu_device pointer
33 *
34 * Allocate a ring buffer for the interrupt controller.
35 * Returns 0 for success, errors for failure.
36 */
37static int amdgpu_ih_ring_alloc(struct amdgpu_device *adev)
38{
39 int r;
40
41 /* Allocate ring buffer */
42 if (adev->irq.ih.ring_obj == NULL) {
43 r = amdgpu_bo_create(adev, adev->irq.ih.ring_size,
44 PAGE_SIZE, true,
45 AMDGPU_GEM_DOMAIN_GTT, 0,
46 NULL, NULL, &adev->irq.ih.ring_obj);
47 if (r) {
48 DRM_ERROR("amdgpu: failed to create ih ring buffer (%d).\n", r);
49 return r;
50 }
51 r = amdgpu_bo_reserve(adev->irq.ih.ring_obj, false);
52 if (unlikely(r != 0))
53 return r;
54 r = amdgpu_bo_pin(adev->irq.ih.ring_obj,
55 AMDGPU_GEM_DOMAIN_GTT,
56 &adev->irq.ih.gpu_addr);
57 if (r) {
58 amdgpu_bo_unreserve(adev->irq.ih.ring_obj);
59 DRM_ERROR("amdgpu: failed to pin ih ring buffer (%d).\n", r);
60 return r;
61 }
62 r = amdgpu_bo_kmap(adev->irq.ih.ring_obj,
63 (void **)&adev->irq.ih.ring);
64 amdgpu_bo_unreserve(adev->irq.ih.ring_obj);
65 if (r) {
66 DRM_ERROR("amdgpu: failed to map ih ring buffer (%d).\n", r);
67 return r;
68 }
69 }
70 return 0;
71}
72
73/**
74 * amdgpu_ih_ring_init - initialize the IH state
75 *
76 * @adev: amdgpu_device pointer
77 *
78 * Initializes the IH state and allocates a buffer
79 * for the IH ring buffer.
80 * Returns 0 for success, errors for failure.
81 */
82int amdgpu_ih_ring_init(struct amdgpu_device *adev, unsigned ring_size,
83 bool use_bus_addr)
84{
85 u32 rb_bufsz;
86 int r;
87
88 /* Align ring size */
89 rb_bufsz = order_base_2(ring_size / 4);
90 ring_size = (1 << rb_bufsz) * 4;
91 adev->irq.ih.ring_size = ring_size;
92 adev->irq.ih.ptr_mask = adev->irq.ih.ring_size - 1;
93 adev->irq.ih.rptr = 0;
94 adev->irq.ih.use_bus_addr = use_bus_addr;
95
96 if (adev->irq.ih.use_bus_addr) {
97 if (!adev->irq.ih.ring) {
98 /* add 8 bytes for the rptr/wptr shadows and
99 * add them to the end of the ring allocation.
100 */
101 adev->irq.ih.ring = pci_alloc_consistent(adev->pdev,
102 adev->irq.ih.ring_size + 8,
103 &adev->irq.ih.rb_dma_addr);
104 if (adev->irq.ih.ring == NULL)
105 return -ENOMEM;
106 memset((void *)adev->irq.ih.ring, 0, adev->irq.ih.ring_size + 8);
107 adev->irq.ih.wptr_offs = (adev->irq.ih.ring_size / 4) + 0;
108 adev->irq.ih.rptr_offs = (adev->irq.ih.ring_size / 4) + 1;
109 }
110 return 0;
111 } else {
112 r = amdgpu_wb_get(adev, &adev->irq.ih.wptr_offs);
113 if (r) {
114 dev_err(adev->dev, "(%d) ih wptr_offs wb alloc failed\n", r);
115 return r;
116 }
117
118 r = amdgpu_wb_get(adev, &adev->irq.ih.rptr_offs);
119 if (r) {
120 amdgpu_wb_free(adev, adev->irq.ih.wptr_offs);
121 dev_err(adev->dev, "(%d) ih rptr_offs wb alloc failed\n", r);
122 return r;
123 }
124
125 return amdgpu_ih_ring_alloc(adev);
126 }
127}
128
129/**
130 * amdgpu_ih_ring_fini - tear down the IH state
131 *
132 * @adev: amdgpu_device pointer
133 *
134 * Tears down the IH state and frees buffer
135 * used for the IH ring buffer.
136 */
137void amdgpu_ih_ring_fini(struct amdgpu_device *adev)
138{
139 int r;
140
141 if (adev->irq.ih.use_bus_addr) {
142 if (adev->irq.ih.ring) {
143 /* add 8 bytes for the rptr/wptr shadows and
144 * add them to the end of the ring allocation.
145 */
146 pci_free_consistent(adev->pdev, adev->irq.ih.ring_size + 8,
147 (void *)adev->irq.ih.ring,
148 adev->irq.ih.rb_dma_addr);
149 adev->irq.ih.ring = NULL;
150 }
151 } else {
152 if (adev->irq.ih.ring_obj) {
153 r = amdgpu_bo_reserve(adev->irq.ih.ring_obj, false);
154 if (likely(r == 0)) {
155 amdgpu_bo_kunmap(adev->irq.ih.ring_obj);
156 amdgpu_bo_unpin(adev->irq.ih.ring_obj);
157 amdgpu_bo_unreserve(adev->irq.ih.ring_obj);
158 }
159 amdgpu_bo_unref(&adev->irq.ih.ring_obj);
160 adev->irq.ih.ring = NULL;
161 adev->irq.ih.ring_obj = NULL;
162 }
163 amdgpu_wb_free(adev, adev->irq.ih.wptr_offs);
164 amdgpu_wb_free(adev, adev->irq.ih.rptr_offs);
165 }
166}
167
168/**
169 * amdgpu_ih_process - interrupt handler
170 *
171 * @adev: amdgpu_device pointer
172 *
173 * Interrupt hander (VI), walk the IH ring.
174 * Returns irq process return code.
175 */
176int amdgpu_ih_process(struct amdgpu_device *adev)
177{
178 struct amdgpu_iv_entry entry;
179 u32 wptr;
180
181 if (!adev->irq.ih.enabled || adev->shutdown)
182 return IRQ_NONE;
183
184 wptr = amdgpu_ih_get_wptr(adev);
185
186restart_ih:
187 /* is somebody else already processing irqs? */
188 if (atomic_xchg(&adev->irq.ih.lock, 1))
189 return IRQ_NONE;
190
191 DRM_DEBUG("%s: rptr %d, wptr %d\n", __func__, adev->irq.ih.rptr, wptr);
192
193 /* Order reading of wptr vs. reading of IH ring data */
194 rmb();
195
196 while (adev->irq.ih.rptr != wptr) {
197 u32 ring_index = adev->irq.ih.rptr >> 2;
198
199 /* Before dispatching irq to IP blocks, send it to amdkfd */
200 amdgpu_amdkfd_interrupt(adev,
201 (const void *) &adev->irq.ih.ring[ring_index]);
202
203 entry.iv_entry = (const uint32_t *)
204 &adev->irq.ih.ring[ring_index];
205 amdgpu_ih_decode_iv(adev, &entry);
206 adev->irq.ih.rptr &= adev->irq.ih.ptr_mask;
207
208 amdgpu_irq_dispatch(adev, &entry);
209 }
210 amdgpu_ih_set_rptr(adev);
211 atomic_set(&adev->irq.ih.lock, 0);
212
213 /* make sure wptr hasn't changed while processing */
214 wptr = amdgpu_ih_get_wptr(adev);
215 if (wptr != adev->irq.ih.rptr)
216 goto restart_ih;
217
218 return IRQ_HANDLED;
219}
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
24#include <linux/dma-mapping.h>
25
26#include "amdgpu.h"
27#include "amdgpu_ih.h"
28
29/**
30 * amdgpu_ih_ring_init - initialize the IH state
31 *
32 * @adev: amdgpu_device pointer
33 * @ih: ih ring to initialize
34 * @ring_size: ring size to allocate
35 * @use_bus_addr: true when we can use dma_alloc_coherent
36 *
37 * Initializes the IH state and allocates a buffer
38 * for the IH ring buffer.
39 * Returns 0 for success, errors for failure.
40 */
41int amdgpu_ih_ring_init(struct amdgpu_device *adev, struct amdgpu_ih_ring *ih,
42 unsigned ring_size, bool use_bus_addr)
43{
44 u32 rb_bufsz;
45 int r;
46
47 /* Align ring size */
48 rb_bufsz = order_base_2(ring_size / 4);
49 ring_size = (1 << rb_bufsz) * 4;
50 ih->ring_size = ring_size;
51 ih->ptr_mask = ih->ring_size - 1;
52 ih->rptr = 0;
53 ih->use_bus_addr = use_bus_addr;
54
55 if (use_bus_addr) {
56 dma_addr_t dma_addr;
57
58 if (ih->ring)
59 return 0;
60
61 /* add 8 bytes for the rptr/wptr shadows and
62 * add them to the end of the ring allocation.
63 */
64 ih->ring = dma_alloc_coherent(adev->dev, ih->ring_size + 8,
65 &dma_addr, GFP_KERNEL);
66 if (ih->ring == NULL)
67 return -ENOMEM;
68
69 memset((void *)ih->ring, 0, ih->ring_size + 8);
70 ih->gpu_addr = dma_addr;
71 ih->wptr_addr = dma_addr + ih->ring_size;
72 ih->wptr_cpu = &ih->ring[ih->ring_size / 4];
73 ih->rptr_addr = dma_addr + ih->ring_size + 4;
74 ih->rptr_cpu = &ih->ring[(ih->ring_size / 4) + 1];
75 } else {
76 unsigned wptr_offs, rptr_offs;
77
78 r = amdgpu_device_wb_get(adev, &wptr_offs);
79 if (r)
80 return r;
81
82 r = amdgpu_device_wb_get(adev, &rptr_offs);
83 if (r) {
84 amdgpu_device_wb_free(adev, wptr_offs);
85 return r;
86 }
87
88 r = amdgpu_bo_create_kernel(adev, ih->ring_size, PAGE_SIZE,
89 AMDGPU_GEM_DOMAIN_GTT,
90 &ih->ring_obj, &ih->gpu_addr,
91 (void **)&ih->ring);
92 if (r) {
93 amdgpu_device_wb_free(adev, rptr_offs);
94 amdgpu_device_wb_free(adev, wptr_offs);
95 return r;
96 }
97
98 ih->wptr_addr = adev->wb.gpu_addr + wptr_offs * 4;
99 ih->wptr_cpu = &adev->wb.wb[wptr_offs];
100 ih->rptr_addr = adev->wb.gpu_addr + rptr_offs * 4;
101 ih->rptr_cpu = &adev->wb.wb[rptr_offs];
102 }
103 return 0;
104}
105
106/**
107 * amdgpu_ih_ring_fini - tear down the IH state
108 *
109 * @adev: amdgpu_device pointer
110 * @ih: ih ring to tear down
111 *
112 * Tears down the IH state and frees buffer
113 * used for the IH ring buffer.
114 */
115void amdgpu_ih_ring_fini(struct amdgpu_device *adev, struct amdgpu_ih_ring *ih)
116{
117 if (ih->use_bus_addr) {
118 if (!ih->ring)
119 return;
120
121 /* add 8 bytes for the rptr/wptr shadows and
122 * add them to the end of the ring allocation.
123 */
124 dma_free_coherent(adev->dev, ih->ring_size + 8,
125 (void *)ih->ring, ih->gpu_addr);
126 ih->ring = NULL;
127 } else {
128 amdgpu_bo_free_kernel(&ih->ring_obj, &ih->gpu_addr,
129 (void **)&ih->ring);
130 amdgpu_device_wb_free(adev, (ih->wptr_addr - ih->gpu_addr) / 4);
131 amdgpu_device_wb_free(adev, (ih->rptr_addr - ih->gpu_addr) / 4);
132 }
133}
134
135/**
136 * amdgpu_ih_process - interrupt handler
137 *
138 * @adev: amdgpu_device pointer
139 * @ih: ih ring to process
140 *
141 * Interrupt hander (VI), walk the IH ring.
142 * Returns irq process return code.
143 */
144int amdgpu_ih_process(struct amdgpu_device *adev, struct amdgpu_ih_ring *ih)
145{
146 unsigned int count = AMDGPU_IH_MAX_NUM_IVS;
147 u32 wptr;
148
149 if (!ih->enabled || adev->shutdown)
150 return IRQ_NONE;
151
152 wptr = amdgpu_ih_get_wptr(adev, ih);
153
154restart_ih:
155 /* is somebody else already processing irqs? */
156 if (atomic_xchg(&ih->lock, 1))
157 return IRQ_NONE;
158
159 DRM_DEBUG("%s: rptr %d, wptr %d\n", __func__, ih->rptr, wptr);
160
161 /* Order reading of wptr vs. reading of IH ring data */
162 rmb();
163
164 while (ih->rptr != wptr && --count) {
165 amdgpu_irq_dispatch(adev, ih);
166 ih->rptr &= ih->ptr_mask;
167 }
168
169 amdgpu_ih_set_rptr(adev, ih);
170 atomic_set(&ih->lock, 0);
171
172 /* make sure wptr hasn't changed while processing */
173 wptr = amdgpu_ih_get_wptr(adev, ih);
174 if (wptr != ih->rptr)
175 goto restart_ih;
176
177 return IRQ_HANDLED;
178}
179