1 /* $NetBSD: kfd_kernel_queue.c,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 #include <sys/cdefs.h>
27 __KERNEL_RCSID(0, "$NetBSD: kfd_kernel_queue.c,v 1.3 2021/12/18 23:44:59 riastradh Exp $");
28
29 #include <linux/types.h>
30 #include <linux/mutex.h>
31 #include <linux/slab.h>
32 #include <linux/printk.h>
33 #include <linux/sched.h>
34 #include "kfd_kernel_queue.h"
35 #include "kfd_priv.h"
36 #include "kfd_device_queue_manager.h"
37 #include "kfd_pm4_headers.h"
38 #include "kfd_pm4_opcodes.h"
39
40 #define PM4_COUNT_ZERO (((1 << 15) - 1) << 16)
41
42 /* Initialize a kernel queue, including allocations of GART memory
43 * needed for the queue.
44 */
kq_initialize(struct kernel_queue * kq,struct kfd_dev * dev,enum kfd_queue_type type,unsigned int queue_size)45 static bool kq_initialize(struct kernel_queue *kq, struct kfd_dev *dev,
46 enum kfd_queue_type type, unsigned int queue_size)
47 {
48 struct queue_properties prop;
49 int retval;
50 union PM4_MES_TYPE_3_HEADER nop;
51
52 if (WARN_ON(type != KFD_QUEUE_TYPE_DIQ && type != KFD_QUEUE_TYPE_HIQ))
53 return false;
54
55 pr_debug("Initializing queue type %d size %d\n", KFD_QUEUE_TYPE_HIQ,
56 queue_size);
57
58 memset(&prop, 0, sizeof(prop));
59 memset(&nop, 0, sizeof(nop));
60
61 nop.opcode = IT_NOP;
62 nop.type = PM4_TYPE_3;
63 nop.u32all |= PM4_COUNT_ZERO;
64
65 kq->dev = dev;
66 kq->nop_packet = nop.u32all;
67 switch (type) {
68 case KFD_QUEUE_TYPE_DIQ:
69 kq->mqd_mgr = dev->dqm->mqd_mgrs[KFD_MQD_TYPE_DIQ];
70 break;
71 case KFD_QUEUE_TYPE_HIQ:
72 kq->mqd_mgr = dev->dqm->mqd_mgrs[KFD_MQD_TYPE_HIQ];
73 break;
74 default:
75 pr_err("Invalid queue type %d\n", type);
76 return false;
77 }
78
79 if (!kq->mqd_mgr)
80 return false;
81
82 prop.doorbell_ptr = kfd_get_kernel_doorbell(dev, &prop.doorbell_off);
83
84 if (!prop.doorbell_ptr) {
85 pr_err("Failed to initialize doorbell");
86 goto err_get_kernel_doorbell;
87 }
88
89 retval = kfd_gtt_sa_allocate(dev, queue_size, &kq->pq);
90 if (retval != 0) {
91 pr_err("Failed to init pq queues size %d\n", queue_size);
92 goto err_pq_allocate_vidmem;
93 }
94
95 kq->pq_kernel_addr = kq->pq->cpu_ptr;
96 kq->pq_gpu_addr = kq->pq->gpu_addr;
97
98 /* For CIK family asics, kq->eop_mem is not needed */
99 if (dev->device_info->asic_family > CHIP_MULLINS) {
100 retval = kfd_gtt_sa_allocate(dev, PAGE_SIZE, &kq->eop_mem);
101 if (retval != 0)
102 goto err_eop_allocate_vidmem;
103
104 kq->eop_gpu_addr = kq->eop_mem->gpu_addr;
105 kq->eop_kernel_addr = kq->eop_mem->cpu_ptr;
106
107 memset(kq->eop_kernel_addr, 0, PAGE_SIZE);
108 }
109
110 retval = kfd_gtt_sa_allocate(dev, sizeof(*kq->rptr_kernel),
111 &kq->rptr_mem);
112
113 if (retval != 0)
114 goto err_rptr_allocate_vidmem;
115
116 kq->rptr_kernel = kq->rptr_mem->cpu_ptr;
117 kq->rptr_gpu_addr = kq->rptr_mem->gpu_addr;
118
119 retval = kfd_gtt_sa_allocate(dev, dev->device_info->doorbell_size,
120 &kq->wptr_mem);
121
122 if (retval != 0)
123 goto err_wptr_allocate_vidmem;
124
125 kq->wptr_kernel = kq->wptr_mem->cpu_ptr;
126 kq->wptr_gpu_addr = kq->wptr_mem->gpu_addr;
127
128 memset(kq->pq_kernel_addr, 0, queue_size);
129 memset(kq->rptr_kernel, 0, sizeof(*kq->rptr_kernel));
130 memset(kq->wptr_kernel, 0, sizeof(*kq->wptr_kernel));
131
132 prop.queue_size = queue_size;
133 prop.is_interop = false;
134 prop.priority = 1;
135 prop.queue_percent = 100;
136 prop.type = type;
137 prop.vmid = 0;
138 prop.queue_address = kq->pq_gpu_addr;
139 prop.read_ptr = (uint32_t *) kq->rptr_gpu_addr;
140 prop.write_ptr = (uint32_t *) kq->wptr_gpu_addr;
141 prop.eop_ring_buffer_address = kq->eop_gpu_addr;
142 prop.eop_ring_buffer_size = PAGE_SIZE;
143 prop.cu_mask = NULL;
144
145 if (init_queue(&kq->queue, &prop) != 0)
146 goto err_init_queue;
147
148 kq->queue->device = dev;
149 kq->queue->process = kfd_get_process(current);
150
151 kq->queue->mqd_mem_obj = kq->mqd_mgr->allocate_mqd(kq->mqd_mgr->dev,
152 &kq->queue->properties);
153 if (!kq->queue->mqd_mem_obj)
154 goto err_allocate_mqd;
155 kq->mqd_mgr->init_mqd(kq->mqd_mgr, &kq->queue->mqd,
156 kq->queue->mqd_mem_obj,
157 &kq->queue->gart_mqd_addr,
158 &kq->queue->properties);
159 /* assign HIQ to HQD */
160 if (type == KFD_QUEUE_TYPE_HIQ) {
161 pr_debug("Assigning hiq to hqd\n");
162 kq->queue->pipe = KFD_CIK_HIQ_PIPE;
163 kq->queue->queue = KFD_CIK_HIQ_QUEUE;
164 kq->mqd_mgr->load_mqd(kq->mqd_mgr, kq->queue->mqd,
165 kq->queue->pipe, kq->queue->queue,
166 &kq->queue->properties, NULL);
167 } else {
168 /* allocate fence for DIQ */
169
170 retval = kfd_gtt_sa_allocate(dev, sizeof(uint32_t),
171 &kq->fence_mem_obj);
172
173 if (retval != 0)
174 goto err_alloc_fence;
175
176 kq->fence_kernel_address = kq->fence_mem_obj->cpu_ptr;
177 kq->fence_gpu_addr = kq->fence_mem_obj->gpu_addr;
178 }
179
180 print_queue(kq->queue);
181
182 return true;
183 err_alloc_fence:
184 kq->mqd_mgr->free_mqd(kq->mqd_mgr, kq->queue->mqd, kq->queue->mqd_mem_obj);
185 err_allocate_mqd:
186 uninit_queue(kq->queue);
187 err_init_queue:
188 kfd_gtt_sa_free(dev, kq->wptr_mem);
189 err_wptr_allocate_vidmem:
190 kfd_gtt_sa_free(dev, kq->rptr_mem);
191 err_rptr_allocate_vidmem:
192 kfd_gtt_sa_free(dev, kq->eop_mem);
193 err_eop_allocate_vidmem:
194 kfd_gtt_sa_free(dev, kq->pq);
195 err_pq_allocate_vidmem:
196 kfd_release_kernel_doorbell(dev, prop.doorbell_ptr);
197 err_get_kernel_doorbell:
198 return false;
199
200 }
201
202 /* Uninitialize a kernel queue and free all its memory usages. */
kq_uninitialize(struct kernel_queue * kq,bool hanging)203 static void kq_uninitialize(struct kernel_queue *kq, bool hanging)
204 {
205 if (kq->queue->properties.type == KFD_QUEUE_TYPE_HIQ && !hanging)
206 kq->mqd_mgr->destroy_mqd(kq->mqd_mgr,
207 kq->queue->mqd,
208 KFD_PREEMPT_TYPE_WAVEFRONT_RESET,
209 KFD_UNMAP_LATENCY_MS,
210 kq->queue->pipe,
211 kq->queue->queue);
212 else if (kq->queue->properties.type == KFD_QUEUE_TYPE_DIQ)
213 kfd_gtt_sa_free(kq->dev, kq->fence_mem_obj);
214
215 kq->mqd_mgr->free_mqd(kq->mqd_mgr, kq->queue->mqd,
216 kq->queue->mqd_mem_obj);
217
218 kfd_gtt_sa_free(kq->dev, kq->rptr_mem);
219 kfd_gtt_sa_free(kq->dev, kq->wptr_mem);
220
221 /* For CIK family asics, kq->eop_mem is Null, kfd_gtt_sa_free()
222 * is able to handle NULL properly.
223 */
224 kfd_gtt_sa_free(kq->dev, kq->eop_mem);
225
226 kfd_gtt_sa_free(kq->dev, kq->pq);
227 kfd_release_kernel_doorbell(kq->dev,
228 kq->queue->properties.doorbell_ptr);
229 uninit_queue(kq->queue);
230 }
231
kq_acquire_packet_buffer(struct kernel_queue * kq,size_t packet_size_in_dwords,unsigned int ** buffer_ptr)232 int kq_acquire_packet_buffer(struct kernel_queue *kq,
233 size_t packet_size_in_dwords, unsigned int **buffer_ptr)
234 {
235 size_t available_size;
236 size_t queue_size_dwords;
237 uint32_t wptr, rptr;
238 uint64_t wptr64;
239 unsigned int *queue_address;
240
241 /* When rptr == wptr, the buffer is empty.
242 * When rptr == wptr + 1, the buffer is full.
243 * It is always rptr that advances to the position of wptr, rather than
244 * the opposite. So we can only use up to queue_size_dwords - 1 dwords.
245 */
246 rptr = *kq->rptr_kernel;
247 wptr = kq->pending_wptr;
248 wptr64 = kq->pending_wptr64;
249 queue_address = (unsigned int *)kq->pq_kernel_addr;
250 queue_size_dwords = kq->queue->properties.queue_size / 4;
251
252 pr_debug("rptr: %d\n", rptr);
253 pr_debug("wptr: %d\n", wptr);
254 pr_debug("queue_address 0x%p\n", queue_address);
255
256 available_size = (rptr + queue_size_dwords - 1 - wptr) %
257 queue_size_dwords;
258
259 if (packet_size_in_dwords > available_size) {
260 /*
261 * make sure calling functions know
262 * acquire_packet_buffer() failed
263 */
264 goto err_no_space;
265 }
266
267 if (wptr + packet_size_in_dwords >= queue_size_dwords) {
268 /* make sure after rolling back to position 0, there is
269 * still enough space.
270 */
271 if (packet_size_in_dwords >= rptr)
272 goto err_no_space;
273
274 /* fill nops, roll back and start at position 0 */
275 while (wptr > 0) {
276 queue_address[wptr] = kq->nop_packet;
277 wptr = (wptr + 1) % queue_size_dwords;
278 wptr64++;
279 }
280 }
281
282 *buffer_ptr = &queue_address[wptr];
283 kq->pending_wptr = wptr + packet_size_in_dwords;
284 kq->pending_wptr64 = wptr64 + packet_size_in_dwords;
285
286 return 0;
287
288 err_no_space:
289 *buffer_ptr = NULL;
290 return -ENOMEM;
291 }
292
kq_submit_packet(struct kernel_queue * kq)293 void kq_submit_packet(struct kernel_queue *kq)
294 {
295 #ifdef DEBUG
296 int i;
297
298 for (i = *kq->wptr_kernel; i < kq->pending_wptr; i++) {
299 pr_debug("0x%2X ", kq->pq_kernel_addr[i]);
300 if (i % 15 == 0)
301 pr_debug("\n");
302 }
303 pr_debug("\n");
304 #endif
305 if (kq->dev->device_info->doorbell_size == 8) {
306 *kq->wptr64_kernel = kq->pending_wptr64;
307 write_kernel_doorbell64(kq->queue->properties.doorbell_ptr,
308 kq->pending_wptr64);
309 } else {
310 *kq->wptr_kernel = kq->pending_wptr;
311 write_kernel_doorbell(kq->queue->properties.doorbell_ptr,
312 kq->pending_wptr);
313 }
314 }
315
kq_rollback_packet(struct kernel_queue * kq)316 void kq_rollback_packet(struct kernel_queue *kq)
317 {
318 if (kq->dev->device_info->doorbell_size == 8) {
319 kq->pending_wptr64 = *kq->wptr64_kernel;
320 kq->pending_wptr = *kq->wptr_kernel %
321 (kq->queue->properties.queue_size / 4);
322 } else {
323 kq->pending_wptr = *kq->wptr_kernel;
324 }
325 }
326
kernel_queue_init(struct kfd_dev * dev,enum kfd_queue_type type)327 struct kernel_queue *kernel_queue_init(struct kfd_dev *dev,
328 enum kfd_queue_type type)
329 {
330 struct kernel_queue *kq;
331
332 kq = kzalloc(sizeof(*kq), GFP_KERNEL);
333 if (!kq)
334 return NULL;
335
336 if (kq_initialize(kq, dev, type, KFD_KERNEL_QUEUE_SIZE))
337 return kq;
338
339 pr_err("Failed to init kernel queue\n");
340
341 kfree(kq);
342 return NULL;
343 }
344
kernel_queue_uninit(struct kernel_queue * kq,bool hanging)345 void kernel_queue_uninit(struct kernel_queue *kq, bool hanging)
346 {
347 kq_uninitialize(kq, hanging);
348 kfree(kq);
349 }
350
351 /* FIXME: Can this test be removed? */
test_kq(struct kfd_dev * dev)352 static __attribute__((unused)) void test_kq(struct kfd_dev *dev)
353 {
354 struct kernel_queue *kq;
355 uint32_t *buffer, i;
356 int retval;
357
358 pr_err("Starting kernel queue test\n");
359
360 kq = kernel_queue_init(dev, KFD_QUEUE_TYPE_HIQ);
361 if (unlikely(!kq)) {
362 pr_err(" Failed to initialize HIQ\n");
363 pr_err("Kernel queue test failed\n");
364 return;
365 }
366
367 retval = kq_acquire_packet_buffer(kq, 5, &buffer);
368 if (unlikely(retval != 0)) {
369 pr_err(" Failed to acquire packet buffer\n");
370 pr_err("Kernel queue test failed\n");
371 return;
372 }
373 for (i = 0; i < 5; i++)
374 buffer[i] = kq->nop_packet;
375 kq_submit_packet(kq);
376
377 pr_err("Ending kernel queue test\n");
378 }
379
380
381