xref: /openbmc/linux/drivers/gpu/drm/amd/amdgpu/mxgpu_nv.c (revision aac28965) 
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 "amdgpu.h"
25 #include "nbio/nbio_2_3_offset.h"
26 #include "nbio/nbio_2_3_sh_mask.h"
27 #include "gc/gc_10_1_0_offset.h"
28 #include "gc/gc_10_1_0_sh_mask.h"
29 #include "soc15.h"
30 #include "navi10_ih.h"
31 #include "soc15_common.h"
32 #include "mxgpu_nv.h"
33 
34 #include "amdgpu_reset.h"
35 
36 static void xgpu_nv_mailbox_send_ack(struct amdgpu_device *adev)
37 {
38 	WREG8(NV_MAIBOX_CONTROL_RCV_OFFSET_BYTE, 2);
39 }
40 
41 static void xgpu_nv_mailbox_set_valid(struct amdgpu_device *adev, bool val)
42 {
43 	WREG8(NV_MAIBOX_CONTROL_TRN_OFFSET_BYTE, val ? 1 : 0);
44 }
45 
46 /*
47  * this peek_msg could *only* be called in IRQ routine becuase in IRQ routine
48  * RCV_MSG_VALID filed of BIF_BX_PF_MAILBOX_CONTROL must already be set to 1
49  * by host.
50  *
51  * if called no in IRQ routine, this peek_msg cannot guaranteed to return the
52  * correct value since it doesn't return the RCV_DW0 under the case that
53  * RCV_MSG_VALID is set by host.
54  */
55 static enum idh_event xgpu_nv_mailbox_peek_msg(struct amdgpu_device *adev)
56 {
57 	return RREG32_NO_KIQ(mmMAILBOX_MSGBUF_RCV_DW0);
58 }
59 
60 
61 static int xgpu_nv_mailbox_rcv_msg(struct amdgpu_device *adev,
62 				   enum idh_event event)
63 {
64 	u32 reg;
65 
66 	reg = RREG32_NO_KIQ(mmMAILBOX_MSGBUF_RCV_DW0);
67 	if (reg != event)
68 		return -ENOENT;
69 
70 	xgpu_nv_mailbox_send_ack(adev);
71 
72 	return 0;
73 }
74 
75 static uint8_t xgpu_nv_peek_ack(struct amdgpu_device *adev)
76 {
77 	return RREG8(NV_MAIBOX_CONTROL_TRN_OFFSET_BYTE) & 2;
78 }
79 
80 static int xgpu_nv_poll_ack(struct amdgpu_device *adev)
81 {
82 	int timeout  = NV_MAILBOX_POLL_ACK_TIMEDOUT;
83 	u8 reg;
84 
85 	do {
86 		reg = RREG8(NV_MAIBOX_CONTROL_TRN_OFFSET_BYTE);
87 		if (reg & 2)
88 			return 0;
89 
90 		mdelay(5);
91 		timeout -= 5;
92 	} while (timeout > 1);
93 
94 	pr_err("Doesn't get TRN_MSG_ACK from pf in %d msec\n", NV_MAILBOX_POLL_ACK_TIMEDOUT);
95 
96 	return -ETIME;
97 }
98 
99 static int xgpu_nv_poll_msg(struct amdgpu_device *adev, enum idh_event event)
100 {
101 	int r;
102 	uint64_t timeout, now;
103 
104 	now = (uint64_t)ktime_to_ms(ktime_get());
105 	timeout = now + NV_MAILBOX_POLL_MSG_TIMEDOUT;
106 
107 	do {
108 		r = xgpu_nv_mailbox_rcv_msg(adev, event);
109 		if (!r)
110 			return 0;
111 
112 		msleep(10);
113 		now = (uint64_t)ktime_to_ms(ktime_get());
114 	} while (timeout > now);
115 
116 
117 	return -ETIME;
118 }
119 
120 static void xgpu_nv_mailbox_trans_msg (struct amdgpu_device *adev,
121 	      enum idh_request req, u32 data1, u32 data2, u32 data3)
122 {
123 	int r;
124 	uint8_t trn;
125 
126 	/* IMPORTANT:
127 	 * clear TRN_MSG_VALID valid to clear host's RCV_MSG_ACK
128 	 * and with host's RCV_MSG_ACK cleared hw automatically clear host's RCV_MSG_ACK
129 	 * which lead to VF's TRN_MSG_ACK cleared, otherwise below xgpu_nv_poll_ack()
130 	 * will return immediatly
131 	 */
132 	do {
133 		xgpu_nv_mailbox_set_valid(adev, false);
134 		trn = xgpu_nv_peek_ack(adev);
135 		if (trn) {
136 			pr_err("trn=%x ACK should not assert! wait again !\n", trn);
137 			msleep(1);
138 		}
139 	} while (trn);
140 
141 	WREG32_NO_KIQ(mmMAILBOX_MSGBUF_TRN_DW0, req);
142 	WREG32_NO_KIQ(mmMAILBOX_MSGBUF_TRN_DW1, data1);
143 	WREG32_NO_KIQ(mmMAILBOX_MSGBUF_TRN_DW2, data2);
144 	WREG32_NO_KIQ(mmMAILBOX_MSGBUF_TRN_DW3, data3);
145 	xgpu_nv_mailbox_set_valid(adev, true);
146 
147 	/* start to poll ack */
148 	r = xgpu_nv_poll_ack(adev);
149 	if (r)
150 		pr_err("Doesn't get ack from pf, continue\n");
151 
152 	xgpu_nv_mailbox_set_valid(adev, false);
153 }
154 
155 static int xgpu_nv_send_access_requests(struct amdgpu_device *adev,
156 					enum idh_request req)
157 {
158 	int r, retry = 1;
159 	enum idh_event event = -1;
160 
161 send_request:
162 	xgpu_nv_mailbox_trans_msg(adev, req, 0, 0, 0);
163 
164 	switch (req) {
165 	case IDH_REQ_GPU_INIT_ACCESS:
166 	case IDH_REQ_GPU_FINI_ACCESS:
167 	case IDH_REQ_GPU_RESET_ACCESS:
168 		event = IDH_READY_TO_ACCESS_GPU;
169 		break;
170 	case IDH_REQ_GPU_INIT_DATA:
171 		event = IDH_REQ_GPU_INIT_DATA_READY;
172 		break;
173 	default:
174 		break;
175 	}
176 
177 	if (event != -1) {
178 		r = xgpu_nv_poll_msg(adev, event);
179 		if (r) {
180 			if (retry++ < 2)
181 				goto send_request;
182 
183 			if (req != IDH_REQ_GPU_INIT_DATA) {
184 				pr_err("Doesn't get msg:%d from pf, error=%d\n", event, r);
185 				return r;
186 			}
187 			else /* host doesn't support REQ_GPU_INIT_DATA handshake */
188 				adev->virt.req_init_data_ver = 0;
189 		} else {
190 			if (req == IDH_REQ_GPU_INIT_DATA)
191 			{
192 				adev->virt.req_init_data_ver =
193 					RREG32_NO_KIQ(mmMAILBOX_MSGBUF_RCV_DW1);
194 
195 				/* assume V1 in case host doesn't set version number */
196 				if (adev->virt.req_init_data_ver < 1)
197 					adev->virt.req_init_data_ver = 1;
198 			}
199 		}
200 
201 		/* Retrieve checksum from mailbox2 */
202 		if (req == IDH_REQ_GPU_INIT_ACCESS || req == IDH_REQ_GPU_RESET_ACCESS) {
203 			adev->virt.fw_reserve.checksum_key =
204 				RREG32_NO_KIQ(mmMAILBOX_MSGBUF_RCV_DW2);
205 		}
206 	}
207 
208 	return 0;
209 }
210 
211 static int xgpu_nv_request_reset(struct amdgpu_device *adev)
212 {
213 	int ret, i = 0;
214 
215 	while (i < NV_MAILBOX_POLL_MSG_REP_MAX) {
216 		ret = xgpu_nv_send_access_requests(adev, IDH_REQ_GPU_RESET_ACCESS);
217 		if (!ret)
218 			break;
219 		i++;
220 	}
221 
222 	return ret;
223 }
224 
225 static int xgpu_nv_request_full_gpu_access(struct amdgpu_device *adev,
226 					   bool init)
227 {
228 	enum idh_request req;
229 
230 	req = init ? IDH_REQ_GPU_INIT_ACCESS : IDH_REQ_GPU_FINI_ACCESS;
231 	return xgpu_nv_send_access_requests(adev, req);
232 }
233 
234 static int xgpu_nv_release_full_gpu_access(struct amdgpu_device *adev,
235 					   bool init)
236 {
237 	enum idh_request req;
238 	int r = 0;
239 
240 	req = init ? IDH_REL_GPU_INIT_ACCESS : IDH_REL_GPU_FINI_ACCESS;
241 	r = xgpu_nv_send_access_requests(adev, req);
242 
243 	return r;
244 }
245 
246 static int xgpu_nv_request_init_data(struct amdgpu_device *adev)
247 {
248 	return xgpu_nv_send_access_requests(adev, IDH_REQ_GPU_INIT_DATA);
249 }
250 
251 static int xgpu_nv_mailbox_ack_irq(struct amdgpu_device *adev,
252 					struct amdgpu_irq_src *source,
253 					struct amdgpu_iv_entry *entry)
254 {
255 	DRM_DEBUG("get ack intr and do nothing.\n");
256 	return 0;
257 }
258 
259 static int xgpu_nv_set_mailbox_ack_irq(struct amdgpu_device *adev,
260 					struct amdgpu_irq_src *source,
261 					unsigned type,
262 					enum amdgpu_interrupt_state state)
263 {
264 	u32 tmp = RREG32_NO_KIQ(mmMAILBOX_INT_CNTL);
265 
266 	if (state == AMDGPU_IRQ_STATE_ENABLE)
267 		tmp |= 2;
268 	else
269 		tmp &= ~2;
270 
271 	WREG32_NO_KIQ(mmMAILBOX_INT_CNTL, tmp);
272 
273 	return 0;
274 }
275 
276 static void xgpu_nv_mailbox_flr_work(struct work_struct *work)
277 {
278 	struct amdgpu_virt *virt = container_of(work, struct amdgpu_virt, flr_work);
279 	struct amdgpu_device *adev = container_of(virt, struct amdgpu_device, virt);
280 	int timeout = NV_MAILBOX_POLL_FLR_TIMEDOUT;
281 
282 	/* block amdgpu_gpu_recover till msg FLR COMPLETE received,
283 	 * otherwise the mailbox msg will be ruined/reseted by
284 	 * the VF FLR.
285 	 */
286 	if (atomic_cmpxchg(&adev->reset_domain->in_gpu_reset, 0, 1) != 0)
287 		return;
288 
289 	down_write(&adev->reset_domain->sem);
290 
291 	amdgpu_virt_fini_data_exchange(adev);
292 
293 	xgpu_nv_mailbox_trans_msg(adev, IDH_READY_TO_RESET, 0, 0, 0);
294 
295 	do {
296 		if (xgpu_nv_mailbox_peek_msg(adev) == IDH_FLR_NOTIFICATION_CMPL)
297 			goto flr_done;
298 
299 		msleep(10);
300 		timeout -= 10;
301 	} while (timeout > 1);
302 
303 flr_done:
304 	atomic_set(&adev->reset_domain->in_gpu_reset, 0);
305 	up_write(&adev->reset_domain->sem);
306 
307 	/* Trigger recovery for world switch failure if no TDR */
308 	if (amdgpu_device_should_recover_gpu(adev)
309 		&& (!amdgpu_device_has_job_running(adev) ||
310 		adev->sdma_timeout == MAX_SCHEDULE_TIMEOUT ||
311 		adev->gfx_timeout == MAX_SCHEDULE_TIMEOUT ||
312 		adev->compute_timeout == MAX_SCHEDULE_TIMEOUT ||
313 		adev->video_timeout == MAX_SCHEDULE_TIMEOUT))
314 		amdgpu_device_gpu_recover_imp(adev, NULL);
315 }
316 
317 static int xgpu_nv_set_mailbox_rcv_irq(struct amdgpu_device *adev,
318 				       struct amdgpu_irq_src *src,
319 				       unsigned type,
320 				       enum amdgpu_interrupt_state state)
321 {
322 	u32 tmp = RREG32_NO_KIQ(mmMAILBOX_INT_CNTL);
323 
324 	if (state == AMDGPU_IRQ_STATE_ENABLE)
325 		tmp |= 1;
326 	else
327 		tmp &= ~1;
328 
329 	WREG32_NO_KIQ(mmMAILBOX_INT_CNTL, tmp);
330 
331 	return 0;
332 }
333 
334 static int xgpu_nv_mailbox_rcv_irq(struct amdgpu_device *adev,
335 				   struct amdgpu_irq_src *source,
336 				   struct amdgpu_iv_entry *entry)
337 {
338 	enum idh_event event = xgpu_nv_mailbox_peek_msg(adev);
339 
340 	switch (event) {
341 	case IDH_FLR_NOTIFICATION:
342 		if (amdgpu_sriov_runtime(adev) && !amdgpu_in_reset(adev))
343 			WARN_ONCE(!amdgpu_reset_domain_schedule(adev->reset_domain,
344 				   &adev->virt.flr_work),
345 				  "Failed to queue work! at %s",
346 				  __func__);
347 		break;
348 		/* READY_TO_ACCESS_GPU is fetched by kernel polling, IRQ can ignore
349 		 * it byfar since that polling thread will handle it,
350 		 * other msg like flr complete is not handled here.
351 		 */
352 	case IDH_CLR_MSG_BUF:
353 	case IDH_FLR_NOTIFICATION_CMPL:
354 	case IDH_READY_TO_ACCESS_GPU:
355 	default:
356 		break;
357 	}
358 
359 	return 0;
360 }
361 
362 static const struct amdgpu_irq_src_funcs xgpu_nv_mailbox_ack_irq_funcs = {
363 	.set = xgpu_nv_set_mailbox_ack_irq,
364 	.process = xgpu_nv_mailbox_ack_irq,
365 };
366 
367 static const struct amdgpu_irq_src_funcs xgpu_nv_mailbox_rcv_irq_funcs = {
368 	.set = xgpu_nv_set_mailbox_rcv_irq,
369 	.process = xgpu_nv_mailbox_rcv_irq,
370 };
371 
372 void xgpu_nv_mailbox_set_irq_funcs(struct amdgpu_device *adev)
373 {
374 	adev->virt.ack_irq.num_types = 1;
375 	adev->virt.ack_irq.funcs = &xgpu_nv_mailbox_ack_irq_funcs;
376 	adev->virt.rcv_irq.num_types = 1;
377 	adev->virt.rcv_irq.funcs = &xgpu_nv_mailbox_rcv_irq_funcs;
378 }
379 
380 int xgpu_nv_mailbox_add_irq_id(struct amdgpu_device *adev)
381 {
382 	int r;
383 
384 	r = amdgpu_irq_add_id(adev, SOC15_IH_CLIENTID_BIF, 135, &adev->virt.rcv_irq);
385 	if (r)
386 		return r;
387 
388 	r = amdgpu_irq_add_id(adev, SOC15_IH_CLIENTID_BIF, 138, &adev->virt.ack_irq);
389 	if (r) {
390 		amdgpu_irq_put(adev, &adev->virt.rcv_irq, 0);
391 		return r;
392 	}
393 
394 	return 0;
395 }
396 
397 int xgpu_nv_mailbox_get_irq(struct amdgpu_device *adev)
398 {
399 	int r;
400 
401 	r = amdgpu_irq_get(adev, &adev->virt.rcv_irq, 0);
402 	if (r)
403 		return r;
404 	r = amdgpu_irq_get(adev, &adev->virt.ack_irq, 0);
405 	if (r) {
406 		amdgpu_irq_put(adev, &adev->virt.rcv_irq, 0);
407 		return r;
408 	}
409 
410 	INIT_WORK(&adev->virt.flr_work, xgpu_nv_mailbox_flr_work);
411 
412 	return 0;
413 }
414 
415 void xgpu_nv_mailbox_put_irq(struct amdgpu_device *adev)
416 {
417 	amdgpu_irq_put(adev, &adev->virt.ack_irq, 0);
418 	amdgpu_irq_put(adev, &adev->virt.rcv_irq, 0);
419 }
420 
421 const struct amdgpu_virt_ops xgpu_nv_virt_ops = {
422 	.req_full_gpu	= xgpu_nv_request_full_gpu_access,
423 	.rel_full_gpu	= xgpu_nv_release_full_gpu_access,
424 	.req_init_data  = xgpu_nv_request_init_data,
425 	.reset_gpu = xgpu_nv_request_reset,
426 	.wait_reset = NULL,
427 	.trans_msg = xgpu_nv_mailbox_trans_msg,
428 };
429