1 /*
2  * Copyright 2020 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/pci.h>
25 
26 #include "amdgpu.h"
27 #include "amdgpu_ih.h"
28 #include "soc15.h"
29 
30 #include "oss/osssys_4_2_0_offset.h"
31 #include "oss/osssys_4_2_0_sh_mask.h"
32 
33 #include "soc15_common.h"
34 #include "vega20_ih.h"
35 
36 #define MAX_REARM_RETRY 10
37 
38 #define mmIH_CHICKEN_ALDEBARAN			0x18d
39 #define mmIH_CHICKEN_ALDEBARAN_BASE_IDX		0
40 
41 static void vega20_ih_set_interrupt_funcs(struct amdgpu_device *adev);
42 
43 /**
44  * vega20_ih_init_register_offset - Initialize register offset for ih rings
45  *
46  * @adev: amdgpu_device pointer
47  *
48  * Initialize register offset ih rings (VEGA20).
49  */
50 static void vega20_ih_init_register_offset(struct amdgpu_device *adev)
51 {
52 	struct amdgpu_ih_regs *ih_regs;
53 
54 	if (adev->irq.ih.ring_size) {
55 		ih_regs = &adev->irq.ih.ih_regs;
56 		ih_regs->ih_rb_base = SOC15_REG_OFFSET(OSSSYS, 0, mmIH_RB_BASE);
57 		ih_regs->ih_rb_base_hi = SOC15_REG_OFFSET(OSSSYS, 0, mmIH_RB_BASE_HI);
58 		ih_regs->ih_rb_cntl = SOC15_REG_OFFSET(OSSSYS, 0, mmIH_RB_CNTL);
59 		ih_regs->ih_rb_wptr = SOC15_REG_OFFSET(OSSSYS, 0, mmIH_RB_WPTR);
60 		ih_regs->ih_rb_rptr = SOC15_REG_OFFSET(OSSSYS, 0, mmIH_RB_RPTR);
61 		ih_regs->ih_doorbell_rptr = SOC15_REG_OFFSET(OSSSYS, 0, mmIH_DOORBELL_RPTR);
62 		ih_regs->ih_rb_wptr_addr_lo = SOC15_REG_OFFSET(OSSSYS, 0, mmIH_RB_WPTR_ADDR_LO);
63 		ih_regs->ih_rb_wptr_addr_hi = SOC15_REG_OFFSET(OSSSYS, 0, mmIH_RB_WPTR_ADDR_HI);
64 		ih_regs->psp_reg_id = PSP_REG_IH_RB_CNTL;
65 	}
66 
67 	if (adev->irq.ih1.ring_size) {
68 		ih_regs = &adev->irq.ih1.ih_regs;
69 		ih_regs->ih_rb_base = SOC15_REG_OFFSET(OSSSYS, 0, mmIH_RB_BASE_RING1);
70 		ih_regs->ih_rb_base_hi = SOC15_REG_OFFSET(OSSSYS, 0, mmIH_RB_BASE_HI_RING1);
71 		ih_regs->ih_rb_cntl = SOC15_REG_OFFSET(OSSSYS, 0, mmIH_RB_CNTL_RING1);
72 		ih_regs->ih_rb_wptr = SOC15_REG_OFFSET(OSSSYS, 0, mmIH_RB_WPTR_RING1);
73 		ih_regs->ih_rb_rptr = SOC15_REG_OFFSET(OSSSYS, 0, mmIH_RB_RPTR_RING1);
74 		ih_regs->ih_doorbell_rptr = SOC15_REG_OFFSET(OSSSYS, 0, mmIH_DOORBELL_RPTR_RING1);
75 		ih_regs->psp_reg_id = PSP_REG_IH_RB_CNTL_RING1;
76 	}
77 
78 	if (adev->irq.ih2.ring_size) {
79 		ih_regs = &adev->irq.ih2.ih_regs;
80 		ih_regs->ih_rb_base = SOC15_REG_OFFSET(OSSSYS, 0, mmIH_RB_BASE_RING2);
81 		ih_regs->ih_rb_base_hi = SOC15_REG_OFFSET(OSSSYS, 0, mmIH_RB_BASE_HI_RING2);
82 		ih_regs->ih_rb_cntl = SOC15_REG_OFFSET(OSSSYS, 0, mmIH_RB_CNTL_RING2);
83 		ih_regs->ih_rb_wptr = SOC15_REG_OFFSET(OSSSYS, 0, mmIH_RB_WPTR_RING2);
84 		ih_regs->ih_rb_rptr = SOC15_REG_OFFSET(OSSSYS, 0, mmIH_RB_RPTR_RING2);
85 		ih_regs->ih_doorbell_rptr = SOC15_REG_OFFSET(OSSSYS, 0, mmIH_DOORBELL_RPTR_RING2);
86 		ih_regs->psp_reg_id = PSP_REG_IH_RB_CNTL_RING2;
87 	}
88 }
89 
90 /**
91  * vega20_ih_toggle_ring_interrupts - toggle the interrupt ring buffer
92  *
93  * @adev: amdgpu_device pointer
94  * @ih: amdgpu_ih_ring pointer
95  * @enable: true - enable the interrupts, false - disable the interrupts
96  *
97  * Toggle the interrupt ring buffer (VEGA20)
98  */
99 static int vega20_ih_toggle_ring_interrupts(struct amdgpu_device *adev,
100 					    struct amdgpu_ih_ring *ih,
101 					    bool enable)
102 {
103 	struct amdgpu_ih_regs *ih_regs;
104 	uint32_t tmp;
105 
106 	ih_regs = &ih->ih_regs;
107 
108 	tmp = RREG32(ih_regs->ih_rb_cntl);
109 	tmp = REG_SET_FIELD(tmp, IH_RB_CNTL, RB_ENABLE, (enable ? 1 : 0));
110 	tmp = REG_SET_FIELD(tmp, IH_RB_CNTL, RB_GPU_TS_ENABLE, 1);
111 
112 	/* enable_intr field is only valid in ring0 */
113 	if (ih == &adev->irq.ih)
114 		tmp = REG_SET_FIELD(tmp, IH_RB_CNTL, ENABLE_INTR, (enable ? 1 : 0));
115 	if (amdgpu_sriov_vf(adev)) {
116 		if (psp_reg_program(&adev->psp, ih_regs->psp_reg_id, tmp)) {
117 			dev_err(adev->dev, "PSP program IH_RB_CNTL failed!\n");
118 			return -ETIMEDOUT;
119 		}
120 	} else {
121 		WREG32(ih_regs->ih_rb_cntl, tmp);
122 	}
123 
124 	if (enable) {
125 		ih->enabled = true;
126 	} else {
127 		/* set rptr, wptr to 0 */
128 		WREG32(ih_regs->ih_rb_rptr, 0);
129 		WREG32(ih_regs->ih_rb_wptr, 0);
130 		ih->enabled = false;
131 		ih->rptr = 0;
132 	}
133 
134 	return 0;
135 }
136 
137 /**
138  * vega20_ih_toggle_interrupts - Toggle all the available interrupt ring buffers
139  *
140  * @adev: amdgpu_device pointer
141  * @enable: enable or disable interrupt ring buffers
142  *
143  * Toggle all the available interrupt ring buffers (VEGA20).
144  */
145 static int vega20_ih_toggle_interrupts(struct amdgpu_device *adev, bool enable)
146 {
147 	struct amdgpu_ih_ring *ih[] = {&adev->irq.ih, &adev->irq.ih1, &adev->irq.ih2};
148 	int i;
149 	int r;
150 
151 	for (i = 0; i < ARRAY_SIZE(ih); i++) {
152 		if (ih[i]->ring_size) {
153 			r = vega20_ih_toggle_ring_interrupts(adev, ih[i], enable);
154 			if (r)
155 				return r;
156 		}
157 	}
158 
159 	return 0;
160 }
161 
162 static uint32_t vega20_ih_rb_cntl(struct amdgpu_ih_ring *ih, uint32_t ih_rb_cntl)
163 {
164 	int rb_bufsz = order_base_2(ih->ring_size / 4);
165 
166 	ih_rb_cntl = REG_SET_FIELD(ih_rb_cntl, IH_RB_CNTL,
167 				   MC_SPACE, ih->use_bus_addr ? 1 : 4);
168 	ih_rb_cntl = REG_SET_FIELD(ih_rb_cntl, IH_RB_CNTL,
169 				   WPTR_OVERFLOW_CLEAR, 1);
170 	ih_rb_cntl = REG_SET_FIELD(ih_rb_cntl, IH_RB_CNTL,
171 				   WPTR_OVERFLOW_ENABLE, 1);
172 	ih_rb_cntl = REG_SET_FIELD(ih_rb_cntl, IH_RB_CNTL, RB_SIZE, rb_bufsz);
173 	/* Ring Buffer write pointer writeback. If enabled, IH_RB_WPTR register
174 	 * value is written to memory
175 	 */
176 	ih_rb_cntl = REG_SET_FIELD(ih_rb_cntl, IH_RB_CNTL,
177 				   WPTR_WRITEBACK_ENABLE, 1);
178 	ih_rb_cntl = REG_SET_FIELD(ih_rb_cntl, IH_RB_CNTL, MC_SNOOP, 1);
179 	ih_rb_cntl = REG_SET_FIELD(ih_rb_cntl, IH_RB_CNTL, MC_RO, 0);
180 	ih_rb_cntl = REG_SET_FIELD(ih_rb_cntl, IH_RB_CNTL, MC_VMID, 0);
181 
182 	return ih_rb_cntl;
183 }
184 
185 static uint32_t vega20_ih_doorbell_rptr(struct amdgpu_ih_ring *ih)
186 {
187 	u32 ih_doorbell_rtpr = 0;
188 
189 	if (ih->use_doorbell) {
190 		ih_doorbell_rtpr = REG_SET_FIELD(ih_doorbell_rtpr,
191 						 IH_DOORBELL_RPTR, OFFSET,
192 						 ih->doorbell_index);
193 		ih_doorbell_rtpr = REG_SET_FIELD(ih_doorbell_rtpr,
194 						 IH_DOORBELL_RPTR,
195 						 ENABLE, 1);
196 	} else {
197 		ih_doorbell_rtpr = REG_SET_FIELD(ih_doorbell_rtpr,
198 						 IH_DOORBELL_RPTR,
199 						 ENABLE, 0);
200 	}
201 	return ih_doorbell_rtpr;
202 }
203 
204 /**
205  * vega20_ih_enable_ring - enable an ih ring buffer
206  *
207  * @adev: amdgpu_device pointer
208  * @ih: amdgpu_ih_ring pointer
209  *
210  * Enable an ih ring buffer (VEGA20)
211  */
212 static int vega20_ih_enable_ring(struct amdgpu_device *adev,
213 				 struct amdgpu_ih_ring *ih)
214 {
215 	struct amdgpu_ih_regs *ih_regs;
216 	uint32_t tmp;
217 
218 	ih_regs = &ih->ih_regs;
219 
220 	/* Ring Buffer base. [39:8] of 40-bit address of the beginning of the ring buffer*/
221 	WREG32(ih_regs->ih_rb_base, ih->gpu_addr >> 8);
222 	WREG32(ih_regs->ih_rb_base_hi, (ih->gpu_addr >> 40) & 0xff);
223 
224 	tmp = RREG32(ih_regs->ih_rb_cntl);
225 	tmp = vega20_ih_rb_cntl(ih, tmp);
226 	if (ih == &adev->irq.ih)
227 		tmp = REG_SET_FIELD(tmp, IH_RB_CNTL, RPTR_REARM, !!adev->irq.msi_enabled);
228 	if (ih == &adev->irq.ih1)
229 		tmp = REG_SET_FIELD(tmp, IH_RB_CNTL, RB_FULL_DRAIN_ENABLE, 1);
230 	if (amdgpu_sriov_vf(adev)) {
231 		if (psp_reg_program(&adev->psp, ih_regs->psp_reg_id, tmp)) {
232 			dev_err(adev->dev, "PSP program IH_RB_CNTL failed!\n");
233 			return -ETIMEDOUT;
234 		}
235 	} else {
236 		WREG32(ih_regs->ih_rb_cntl, tmp);
237 	}
238 
239 	if (ih == &adev->irq.ih) {
240 		/* set the ih ring 0 writeback address whether it's enabled or not */
241 		WREG32(ih_regs->ih_rb_wptr_addr_lo, lower_32_bits(ih->wptr_addr));
242 		WREG32(ih_regs->ih_rb_wptr_addr_hi, upper_32_bits(ih->wptr_addr) & 0xFFFF);
243 	}
244 
245 	/* set rptr, wptr to 0 */
246 	WREG32(ih_regs->ih_rb_wptr, 0);
247 	WREG32(ih_regs->ih_rb_rptr, 0);
248 
249 	WREG32(ih_regs->ih_doorbell_rptr, vega20_ih_doorbell_rptr(ih));
250 
251 	return 0;
252 }
253 
254 /**
255  * vega20_ih_reroute_ih - reroute VMC/UTCL2 ih to an ih ring
256  *
257  * @adev: amdgpu_device pointer
258  *
259  * Reroute VMC and UMC interrupts on primary ih ring to
260  * ih ring 1 so they won't lose when bunches of page faults
261  * interrupts overwhelms the interrupt handler(VEGA20)
262  */
263 static void vega20_ih_reroute_ih(struct amdgpu_device *adev)
264 {
265 	uint32_t tmp;
266 
267 	/* vega20 ih reroute will go through psp this
268 	 * function is used for newer asics starting arcturus
269 	 */
270 	if (adev->ip_versions[OSSSYS_HWIP][0] >= IP_VERSION(4, 2, 1)) {
271 		/* Reroute to IH ring 1 for VMC */
272 		WREG32_SOC15(OSSSYS, 0, mmIH_CLIENT_CFG_INDEX, 0x12);
273 		tmp = RREG32_SOC15(OSSSYS, 0, mmIH_CLIENT_CFG_DATA);
274 		tmp = REG_SET_FIELD(tmp, IH_CLIENT_CFG_DATA, CLIENT_TYPE, 1);
275 		tmp = REG_SET_FIELD(tmp, IH_CLIENT_CFG_DATA, RING_ID, 1);
276 		WREG32_SOC15(OSSSYS, 0, mmIH_CLIENT_CFG_DATA, tmp);
277 
278 		/* Reroute IH ring 1 for UTCL2 */
279 		WREG32_SOC15(OSSSYS, 0, mmIH_CLIENT_CFG_INDEX, 0x1B);
280 		tmp = RREG32_SOC15(OSSSYS, 0, mmIH_CLIENT_CFG_DATA);
281 		tmp = REG_SET_FIELD(tmp, IH_CLIENT_CFG_DATA, RING_ID, 1);
282 		WREG32_SOC15(OSSSYS, 0, mmIH_CLIENT_CFG_DATA, tmp);
283 	}
284 }
285 
286 /**
287  * vega20_ih_irq_init - init and enable the interrupt ring
288  *
289  * @adev: amdgpu_device pointer
290  *
291  * Allocate a ring buffer for the interrupt controller,
292  * enable the RLC, disable interrupts, enable the IH
293  * ring buffer and enable it (VI).
294  * Called at device load and reume.
295  * Returns 0 for success, errors for failure.
296  */
297 static int vega20_ih_irq_init(struct amdgpu_device *adev)
298 {
299 	struct amdgpu_ih_ring *ih[] = {&adev->irq.ih, &adev->irq.ih1, &adev->irq.ih2};
300 	u32 ih_chicken;
301 	int ret;
302 	int i;
303 
304 	/* disable irqs */
305 	ret = vega20_ih_toggle_interrupts(adev, false);
306 	if (ret)
307 		return ret;
308 
309 	adev->nbio.funcs->ih_control(adev);
310 
311 	if ((adev->ip_versions[OSSSYS_HWIP][0] == IP_VERSION(4, 2, 1)) &&
312 	    adev->firmware.load_type == AMDGPU_FW_LOAD_DIRECT) {
313 		ih_chicken = RREG32_SOC15(OSSSYS, 0, mmIH_CHICKEN);
314 		if (adev->irq.ih.use_bus_addr) {
315 			ih_chicken = REG_SET_FIELD(ih_chicken, IH_CHICKEN,
316 						   MC_SPACE_GPA_ENABLE, 1);
317 		}
318 		WREG32_SOC15(OSSSYS, 0, mmIH_CHICKEN, ih_chicken);
319 	}
320 
321 	/* psp firmware won't program IH_CHICKEN for aldebaran
322 	 * driver needs to program it properly according to
323 	 * MC_SPACE type in IH_RB_CNTL */
324 	if ((adev->ip_versions[OSSSYS_HWIP][0] == IP_VERSION(4, 4, 0)) ||
325 	    (adev->ip_versions[OSSSYS_HWIP][0] == IP_VERSION(4, 4, 2))) {
326 		ih_chicken = RREG32_SOC15(OSSSYS, 0, mmIH_CHICKEN_ALDEBARAN);
327 		if (adev->irq.ih.use_bus_addr) {
328 			ih_chicken = REG_SET_FIELD(ih_chicken, IH_CHICKEN,
329 						   MC_SPACE_GPA_ENABLE, 1);
330 		}
331 		WREG32_SOC15(OSSSYS, 0, mmIH_CHICKEN_ALDEBARAN, ih_chicken);
332 	}
333 
334 	for (i = 0; i < ARRAY_SIZE(ih); i++) {
335 		if (ih[i]->ring_size) {
336 			if (i == 1)
337 				vega20_ih_reroute_ih(adev);
338 			ret = vega20_ih_enable_ring(adev, ih[i]);
339 			if (ret)
340 				return ret;
341 		}
342 	}
343 
344 	if (!amdgpu_sriov_vf(adev))
345 		adev->nbio.funcs->ih_doorbell_range(adev, adev->irq.ih.use_doorbell,
346 						    adev->irq.ih.doorbell_index);
347 
348 	pci_set_master(adev->pdev);
349 
350 	/* enable interrupts */
351 	ret = vega20_ih_toggle_interrupts(adev, true);
352 	if (ret)
353 		return ret;
354 
355 	if (adev->irq.ih_soft.ring_size)
356 		adev->irq.ih_soft.enabled = true;
357 
358 	return 0;
359 }
360 
361 /**
362  * vega20_ih_irq_disable - disable interrupts
363  *
364  * @adev: amdgpu_device pointer
365  *
366  * Disable interrupts on the hw (VEGA20).
367  */
368 static void vega20_ih_irq_disable(struct amdgpu_device *adev)
369 {
370 	vega20_ih_toggle_interrupts(adev, false);
371 
372 	/* Wait and acknowledge irq */
373 	mdelay(1);
374 }
375 
376 /**
377  * vega20_ih_get_wptr - get the IH ring buffer wptr
378  *
379  * @adev: amdgpu_device pointer
380  * @ih: amdgpu_ih_ring pointer
381  *
382  * Get the IH ring buffer wptr from either the register
383  * or the writeback memory buffer (VEGA20).  Also check for
384  * ring buffer overflow and deal with it.
385  * Returns the value of the wptr.
386  */
387 static u32 vega20_ih_get_wptr(struct amdgpu_device *adev,
388 			      struct amdgpu_ih_ring *ih)
389 {
390 	u32 wptr, tmp;
391 	struct amdgpu_ih_regs *ih_regs;
392 
393 	if (ih == &adev->irq.ih || ih == &adev->irq.ih_soft) {
394 		/* Only ring0 supports writeback. On other rings fall back
395 		 * to register-based code with overflow checking below.
396 		 * ih_soft ring doesn't have any backing hardware registers,
397 		 * update wptr and return.
398 		 */
399 		wptr = le32_to_cpu(*ih->wptr_cpu);
400 
401 		if (!REG_GET_FIELD(wptr, IH_RB_WPTR, RB_OVERFLOW))
402 			goto out;
403 	}
404 
405 	ih_regs = &ih->ih_regs;
406 
407 	/* Double check that the overflow wasn't already cleared. */
408 	wptr = RREG32_NO_KIQ(ih_regs->ih_rb_wptr);
409 	if (!REG_GET_FIELD(wptr, IH_RB_WPTR, RB_OVERFLOW))
410 		goto out;
411 
412 	wptr = REG_SET_FIELD(wptr, IH_RB_WPTR, RB_OVERFLOW, 0);
413 
414 	/* When a ring buffer overflow happen start parsing interrupt
415 	 * from the last not overwritten vector (wptr + 32). Hopefully
416 	 * this should allow us to catchup.
417 	 */
418 	tmp = (wptr + 32) & ih->ptr_mask;
419 	dev_warn(adev->dev, "IH ring buffer overflow "
420 		 "(0x%08X, 0x%08X, 0x%08X)\n",
421 		 wptr, ih->rptr, tmp);
422 	ih->rptr = tmp;
423 
424 	tmp = RREG32_NO_KIQ(ih_regs->ih_rb_cntl);
425 	tmp = REG_SET_FIELD(tmp, IH_RB_CNTL, WPTR_OVERFLOW_CLEAR, 1);
426 	WREG32_NO_KIQ(ih_regs->ih_rb_cntl, tmp);
427 
428 out:
429 	return (wptr & ih->ptr_mask);
430 }
431 
432 /**
433  * vega20_ih_irq_rearm - rearm IRQ if lost
434  *
435  * @adev: amdgpu_device pointer
436  * @ih: amdgpu_ih_ring pointer
437  *
438  */
439 static void vega20_ih_irq_rearm(struct amdgpu_device *adev,
440 			       struct amdgpu_ih_ring *ih)
441 {
442 	uint32_t v = 0;
443 	uint32_t i = 0;
444 	struct amdgpu_ih_regs *ih_regs;
445 
446 	ih_regs = &ih->ih_regs;
447 
448 	/* Rearm IRQ / re-wwrite doorbell if doorbell write is lost */
449 	for (i = 0; i < MAX_REARM_RETRY; i++) {
450 		v = RREG32_NO_KIQ(ih_regs->ih_rb_rptr);
451 		if ((v < ih->ring_size) && (v != ih->rptr))
452 			WDOORBELL32(ih->doorbell_index, ih->rptr);
453 		else
454 			break;
455 	}
456 }
457 
458 /**
459  * vega20_ih_set_rptr - set the IH ring buffer rptr
460  *
461  * @adev: amdgpu_device pointer
462  * @ih: amdgpu_ih_ring pointer
463  *
464  * Set the IH ring buffer rptr.
465  */
466 static void vega20_ih_set_rptr(struct amdgpu_device *adev,
467 			       struct amdgpu_ih_ring *ih)
468 {
469 	struct amdgpu_ih_regs *ih_regs;
470 
471 	if (ih == &adev->irq.ih_soft)
472 		return;
473 
474 	if (ih->use_doorbell) {
475 		/* XXX check if swapping is necessary on BE */
476 		*ih->rptr_cpu = ih->rptr;
477 		WDOORBELL32(ih->doorbell_index, ih->rptr);
478 
479 		if (amdgpu_sriov_vf(adev))
480 			vega20_ih_irq_rearm(adev, ih);
481 	} else {
482 		ih_regs = &ih->ih_regs;
483 		WREG32(ih_regs->ih_rb_rptr, ih->rptr);
484 	}
485 }
486 
487 /**
488  * vega20_ih_self_irq - dispatch work for ring 1 and 2
489  *
490  * @adev: amdgpu_device pointer
491  * @source: irq source
492  * @entry: IV with WPTR update
493  *
494  * Update the WPTR from the IV and schedule work to handle the entries.
495  */
496 static int vega20_ih_self_irq(struct amdgpu_device *adev,
497 			      struct amdgpu_irq_src *source,
498 			      struct amdgpu_iv_entry *entry)
499 {
500 	switch (entry->ring_id) {
501 	case 1:
502 		schedule_work(&adev->irq.ih1_work);
503 		break;
504 	case 2:
505 		schedule_work(&adev->irq.ih2_work);
506 		break;
507 	default: break;
508 	}
509 	return 0;
510 }
511 
512 static const struct amdgpu_irq_src_funcs vega20_ih_self_irq_funcs = {
513 	.process = vega20_ih_self_irq,
514 };
515 
516 static void vega20_ih_set_self_irq_funcs(struct amdgpu_device *adev)
517 {
518 	adev->irq.self_irq.num_types = 0;
519 	adev->irq.self_irq.funcs = &vega20_ih_self_irq_funcs;
520 }
521 
522 static int vega20_ih_early_init(void *handle)
523 {
524 	struct amdgpu_device *adev = (struct amdgpu_device *)handle;
525 
526 	vega20_ih_set_interrupt_funcs(adev);
527 	vega20_ih_set_self_irq_funcs(adev);
528 	return 0;
529 }
530 
531 static int vega20_ih_sw_init(void *handle)
532 {
533 	struct amdgpu_device *adev = (struct amdgpu_device *)handle;
534 	int r;
535 
536 	r = amdgpu_irq_add_id(adev, SOC15_IH_CLIENTID_IH, 0,
537 			      &adev->irq.self_irq);
538 	if (r)
539 		return r;
540 
541 	r = amdgpu_ih_ring_init(adev, &adev->irq.ih, 256 * 1024, true);
542 	if (r)
543 		return r;
544 
545 	adev->irq.ih.use_doorbell = true;
546 	adev->irq.ih.doorbell_index = adev->doorbell_index.ih << 1;
547 
548 	r = amdgpu_ih_ring_init(adev, &adev->irq.ih1, PAGE_SIZE, true);
549 	if (r)
550 		return r;
551 
552 	adev->irq.ih1.use_doorbell = true;
553 	adev->irq.ih1.doorbell_index = (adev->doorbell_index.ih + 1) << 1;
554 
555 	if (adev->ip_versions[OSSSYS_HWIP][0] != IP_VERSION(4, 4, 2)) {
556 		r = amdgpu_ih_ring_init(adev, &adev->irq.ih2, PAGE_SIZE, true);
557 		if (r)
558 			return r;
559 
560 		adev->irq.ih2.use_doorbell = true;
561 		adev->irq.ih2.doorbell_index = (adev->doorbell_index.ih + 2) << 1;
562 	}
563 
564 	/* initialize ih control registers offset */
565 	vega20_ih_init_register_offset(adev);
566 
567 	r = amdgpu_ih_ring_init(adev, &adev->irq.ih_soft, PAGE_SIZE, true);
568 	if (r)
569 		return r;
570 
571 	r = amdgpu_irq_init(adev);
572 
573 	return r;
574 }
575 
576 static int vega20_ih_sw_fini(void *handle)
577 {
578 	struct amdgpu_device *adev = (struct amdgpu_device *)handle;
579 
580 	amdgpu_irq_fini_sw(adev);
581 
582 	return 0;
583 }
584 
585 static int vega20_ih_hw_init(void *handle)
586 {
587 	int r;
588 	struct amdgpu_device *adev = (struct amdgpu_device *)handle;
589 
590 	r = vega20_ih_irq_init(adev);
591 	if (r)
592 		return r;
593 
594 	return 0;
595 }
596 
597 static int vega20_ih_hw_fini(void *handle)
598 {
599 	struct amdgpu_device *adev = (struct amdgpu_device *)handle;
600 
601 	vega20_ih_irq_disable(adev);
602 
603 	return 0;
604 }
605 
606 static int vega20_ih_suspend(void *handle)
607 {
608 	struct amdgpu_device *adev = (struct amdgpu_device *)handle;
609 
610 	return vega20_ih_hw_fini(adev);
611 }
612 
613 static int vega20_ih_resume(void *handle)
614 {
615 	struct amdgpu_device *adev = (struct amdgpu_device *)handle;
616 
617 	return vega20_ih_hw_init(adev);
618 }
619 
620 static bool vega20_ih_is_idle(void *handle)
621 {
622 	/* todo */
623 	return true;
624 }
625 
626 static int vega20_ih_wait_for_idle(void *handle)
627 {
628 	/* todo */
629 	return -ETIMEDOUT;
630 }
631 
632 static int vega20_ih_soft_reset(void *handle)
633 {
634 	/* todo */
635 
636 	return 0;
637 }
638 
639 static void vega20_ih_update_clockgating_state(struct amdgpu_device *adev,
640 					       bool enable)
641 {
642 	uint32_t data, def, field_val;
643 
644 	if (adev->cg_flags & AMD_CG_SUPPORT_IH_CG) {
645 		def = data = RREG32_SOC15(OSSSYS, 0, mmIH_CLK_CTRL);
646 		field_val = enable ? 0 : 1;
647 		data = REG_SET_FIELD(data, IH_CLK_CTRL,
648 				     IH_RETRY_INT_CAM_MEM_CLK_SOFT_OVERRIDE, field_val);
649 		data = REG_SET_FIELD(data, IH_CLK_CTRL,
650 				     IH_BUFFER_MEM_CLK_SOFT_OVERRIDE, field_val);
651 		data = REG_SET_FIELD(data, IH_CLK_CTRL,
652 				     DBUS_MUX_CLK_SOFT_OVERRIDE, field_val);
653 		data = REG_SET_FIELD(data, IH_CLK_CTRL,
654 				     OSSSYS_SHARE_CLK_SOFT_OVERRIDE, field_val);
655 		data = REG_SET_FIELD(data, IH_CLK_CTRL,
656 				     LIMIT_SMN_CLK_SOFT_OVERRIDE, field_val);
657 		data = REG_SET_FIELD(data, IH_CLK_CTRL,
658 				     DYN_CLK_SOFT_OVERRIDE, field_val);
659 		data = REG_SET_FIELD(data, IH_CLK_CTRL,
660 				     REG_CLK_SOFT_OVERRIDE, field_val);
661 		if (def != data)
662 			WREG32_SOC15(OSSSYS, 0, mmIH_CLK_CTRL, data);
663 	}
664 }
665 
666 static int vega20_ih_set_clockgating_state(void *handle,
667 					  enum amd_clockgating_state state)
668 {
669 	struct amdgpu_device *adev = (struct amdgpu_device *)handle;
670 
671 	vega20_ih_update_clockgating_state(adev,
672 				state == AMD_CG_STATE_GATE);
673 	return 0;
674 
675 }
676 
677 static int vega20_ih_set_powergating_state(void *handle,
678 					  enum amd_powergating_state state)
679 {
680 	return 0;
681 }
682 
683 const struct amd_ip_funcs vega20_ih_ip_funcs = {
684 	.name = "vega20_ih",
685 	.early_init = vega20_ih_early_init,
686 	.late_init = NULL,
687 	.sw_init = vega20_ih_sw_init,
688 	.sw_fini = vega20_ih_sw_fini,
689 	.hw_init = vega20_ih_hw_init,
690 	.hw_fini = vega20_ih_hw_fini,
691 	.suspend = vega20_ih_suspend,
692 	.resume = vega20_ih_resume,
693 	.is_idle = vega20_ih_is_idle,
694 	.wait_for_idle = vega20_ih_wait_for_idle,
695 	.soft_reset = vega20_ih_soft_reset,
696 	.set_clockgating_state = vega20_ih_set_clockgating_state,
697 	.set_powergating_state = vega20_ih_set_powergating_state,
698 };
699 
700 static const struct amdgpu_ih_funcs vega20_ih_funcs = {
701 	.get_wptr = vega20_ih_get_wptr,
702 	.decode_iv = amdgpu_ih_decode_iv_helper,
703 	.decode_iv_ts = amdgpu_ih_decode_iv_ts_helper,
704 	.set_rptr = vega20_ih_set_rptr
705 };
706 
707 static void vega20_ih_set_interrupt_funcs(struct amdgpu_device *adev)
708 {
709 	adev->irq.ih_funcs = &vega20_ih_funcs;
710 }
711 
712 const struct amdgpu_ip_block_version vega20_ih_ip_block =
713 {
714 	.type = AMD_IP_BLOCK_TYPE_IH,
715 	.major = 4,
716 	.minor = 2,
717 	.rev = 0,
718 	.funcs = &vega20_ih_ip_funcs,
719 };
720