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1/*
2 * Copyright 2016 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 <drm/drmP.h>
24#include "amdgpu.h"
25#include "amdgpu_ih.h"
26#include "soc15.h"
27
28#include "oss/osssys_4_0_offset.h"
29#include "oss/osssys_4_0_sh_mask.h"
30
31#include "soc15_common.h"
32#include "vega10_ih.h"
33
34
35
36static void vega10_ih_set_interrupt_funcs(struct amdgpu_device *adev);
37
38/**
39 * vega10_ih_enable_interrupts - Enable the interrupt ring buffer
40 *
41 * @adev: amdgpu_device pointer
42 *
43 * Enable the interrupt ring buffer (VEGA10).
44 */
45static void vega10_ih_enable_interrupts(struct amdgpu_device *adev)
46{
47 u32 ih_rb_cntl = RREG32_SOC15(OSSSYS, 0, mmIH_RB_CNTL);
48
49 ih_rb_cntl = REG_SET_FIELD(ih_rb_cntl, IH_RB_CNTL, RB_ENABLE, 1);
50 ih_rb_cntl = REG_SET_FIELD(ih_rb_cntl, IH_RB_CNTL, ENABLE_INTR, 1);
51 WREG32_SOC15(OSSSYS, 0, mmIH_RB_CNTL, ih_rb_cntl);
52 adev->irq.ih.enabled = true;
53}
54
55/**
56 * vega10_ih_disable_interrupts - Disable the interrupt ring buffer
57 *
58 * @adev: amdgpu_device pointer
59 *
60 * Disable the interrupt ring buffer (VEGA10).
61 */
62static void vega10_ih_disable_interrupts(struct amdgpu_device *adev)
63{
64 u32 ih_rb_cntl = RREG32_SOC15(OSSSYS, 0, mmIH_RB_CNTL);
65
66 ih_rb_cntl = REG_SET_FIELD(ih_rb_cntl, IH_RB_CNTL, RB_ENABLE, 0);
67 ih_rb_cntl = REG_SET_FIELD(ih_rb_cntl, IH_RB_CNTL, ENABLE_INTR, 0);
68 WREG32_SOC15(OSSSYS, 0, mmIH_RB_CNTL, ih_rb_cntl);
69 /* set rptr, wptr to 0 */
70 WREG32_SOC15(OSSSYS, 0, mmIH_RB_RPTR, 0);
71 WREG32_SOC15(OSSSYS, 0, mmIH_RB_WPTR, 0);
72 adev->irq.ih.enabled = false;
73 adev->irq.ih.rptr = 0;
74}
75
76/**
77 * vega10_ih_irq_init - init and enable the interrupt ring
78 *
79 * @adev: amdgpu_device pointer
80 *
81 * Allocate a ring buffer for the interrupt controller,
82 * enable the RLC, disable interrupts, enable the IH
83 * ring buffer and enable it (VI).
84 * Called at device load and reume.
85 * Returns 0 for success, errors for failure.
86 */
87static int vega10_ih_irq_init(struct amdgpu_device *adev)
88{
89 int ret = 0;
90 int rb_bufsz;
91 u32 ih_rb_cntl, ih_doorbell_rtpr;
92 u32 tmp;
93 u64 wptr_off;
94
95 /* disable irqs */
96 vega10_ih_disable_interrupts(adev);
97
98 adev->nbio_funcs->ih_control(adev);
99
100 ih_rb_cntl = RREG32_SOC15(OSSSYS, 0, mmIH_RB_CNTL);
101 /* Ring Buffer base. [39:8] of 40-bit address of the beginning of the ring buffer*/
102 if (adev->irq.ih.use_bus_addr) {
103 WREG32_SOC15(OSSSYS, 0, mmIH_RB_BASE, adev->irq.ih.rb_dma_addr >> 8);
104 WREG32_SOC15(OSSSYS, 0, mmIH_RB_BASE_HI, ((u64)adev->irq.ih.rb_dma_addr >> 40) & 0xff);
105 ih_rb_cntl = REG_SET_FIELD(ih_rb_cntl, IH_RB_CNTL, MC_SPACE, 1);
106 } else {
107 WREG32_SOC15(OSSSYS, 0, mmIH_RB_BASE, adev->irq.ih.gpu_addr >> 8);
108 WREG32_SOC15(OSSSYS, 0, mmIH_RB_BASE_HI, (adev->irq.ih.gpu_addr >> 40) & 0xff);
109 ih_rb_cntl = REG_SET_FIELD(ih_rb_cntl, IH_RB_CNTL, MC_SPACE, 4);
110 }
111 rb_bufsz = order_base_2(adev->irq.ih.ring_size / 4);
112 ih_rb_cntl = REG_SET_FIELD(ih_rb_cntl, IH_RB_CNTL, WPTR_OVERFLOW_CLEAR, 1);
113 ih_rb_cntl = REG_SET_FIELD(ih_rb_cntl, IH_RB_CNTL, WPTR_OVERFLOW_ENABLE, 1);
114 ih_rb_cntl = REG_SET_FIELD(ih_rb_cntl, IH_RB_CNTL, RB_SIZE, rb_bufsz);
115 /* Ring Buffer write pointer writeback. If enabled, IH_RB_WPTR register value is written to memory */
116 ih_rb_cntl = REG_SET_FIELD(ih_rb_cntl, IH_RB_CNTL, WPTR_WRITEBACK_ENABLE, 1);
117 ih_rb_cntl = REG_SET_FIELD(ih_rb_cntl, IH_RB_CNTL, MC_SNOOP, 1);
118 ih_rb_cntl = REG_SET_FIELD(ih_rb_cntl, IH_RB_CNTL, MC_RO, 0);
119 ih_rb_cntl = REG_SET_FIELD(ih_rb_cntl, IH_RB_CNTL, MC_VMID, 0);
120
121 if (adev->irq.msi_enabled)
122 ih_rb_cntl = REG_SET_FIELD(ih_rb_cntl, IH_RB_CNTL, RPTR_REARM, 1);
123
124 WREG32_SOC15(OSSSYS, 0, mmIH_RB_CNTL, ih_rb_cntl);
125
126 /* set the writeback address whether it's enabled or not */
127 if (adev->irq.ih.use_bus_addr)
128 wptr_off = adev->irq.ih.rb_dma_addr + (adev->irq.ih.wptr_offs * 4);
129 else
130 wptr_off = adev->wb.gpu_addr + (adev->irq.ih.wptr_offs * 4);
131 WREG32_SOC15(OSSSYS, 0, mmIH_RB_WPTR_ADDR_LO, lower_32_bits(wptr_off));
132 WREG32_SOC15(OSSSYS, 0, mmIH_RB_WPTR_ADDR_HI, upper_32_bits(wptr_off) & 0xFF);
133
134 /* set rptr, wptr to 0 */
135 WREG32_SOC15(OSSSYS, 0, mmIH_RB_RPTR, 0);
136 WREG32_SOC15(OSSSYS, 0, mmIH_RB_WPTR, 0);
137
138 ih_doorbell_rtpr = RREG32_SOC15(OSSSYS, 0, mmIH_DOORBELL_RPTR);
139 if (adev->irq.ih.use_doorbell) {
140 ih_doorbell_rtpr = REG_SET_FIELD(ih_doorbell_rtpr, IH_DOORBELL_RPTR,
141 OFFSET, adev->irq.ih.doorbell_index);
142 ih_doorbell_rtpr = REG_SET_FIELD(ih_doorbell_rtpr, IH_DOORBELL_RPTR,
143 ENABLE, 1);
144 } else {
145 ih_doorbell_rtpr = REG_SET_FIELD(ih_doorbell_rtpr, IH_DOORBELL_RPTR,
146 ENABLE, 0);
147 }
148 WREG32_SOC15(OSSSYS, 0, mmIH_DOORBELL_RPTR, ih_doorbell_rtpr);
149 adev->nbio_funcs->ih_doorbell_range(adev, adev->irq.ih.use_doorbell,
150 adev->irq.ih.doorbell_index);
151
152 tmp = RREG32_SOC15(OSSSYS, 0, mmIH_STORM_CLIENT_LIST_CNTL);
153 tmp = REG_SET_FIELD(tmp, IH_STORM_CLIENT_LIST_CNTL,
154 CLIENT18_IS_STORM_CLIENT, 1);
155 WREG32_SOC15(OSSSYS, 0, mmIH_STORM_CLIENT_LIST_CNTL, tmp);
156
157 tmp = RREG32_SOC15(OSSSYS, 0, mmIH_INT_FLOOD_CNTL);
158 tmp = REG_SET_FIELD(tmp, IH_INT_FLOOD_CNTL, FLOOD_CNTL_ENABLE, 1);
159 WREG32_SOC15(OSSSYS, 0, mmIH_INT_FLOOD_CNTL, tmp);
160
161 pci_set_master(adev->pdev);
162
163 /* enable interrupts */
164 vega10_ih_enable_interrupts(adev);
165
166 return ret;
167}
168
169/**
170 * vega10_ih_irq_disable - disable interrupts
171 *
172 * @adev: amdgpu_device pointer
173 *
174 * Disable interrupts on the hw (VEGA10).
175 */
176static void vega10_ih_irq_disable(struct amdgpu_device *adev)
177{
178 vega10_ih_disable_interrupts(adev);
179
180 /* Wait and acknowledge irq */
181 mdelay(1);
182}
183
184/**
185 * vega10_ih_get_wptr - get the IH ring buffer wptr
186 *
187 * @adev: amdgpu_device pointer
188 *
189 * Get the IH ring buffer wptr from either the register
190 * or the writeback memory buffer (VEGA10). Also check for
191 * ring buffer overflow and deal with it.
192 * Returns the value of the wptr.
193 */
194static u32 vega10_ih_get_wptr(struct amdgpu_device *adev)
195{
196 u32 wptr, tmp;
197
198 if (adev->irq.ih.use_bus_addr)
199 wptr = le32_to_cpu(adev->irq.ih.ring[adev->irq.ih.wptr_offs]);
200 else
201 wptr = le32_to_cpu(adev->wb.wb[adev->irq.ih.wptr_offs]);
202
203 if (REG_GET_FIELD(wptr, IH_RB_WPTR, RB_OVERFLOW)) {
204 wptr = REG_SET_FIELD(wptr, IH_RB_WPTR, RB_OVERFLOW, 0);
205
206 /* When a ring buffer overflow happen start parsing interrupt
207 * from the last not overwritten vector (wptr + 32). Hopefully
208 * this should allow us to catchup.
209 */
210 tmp = (wptr + 32) & adev->irq.ih.ptr_mask;
211 dev_warn(adev->dev, "IH ring buffer overflow (0x%08X, 0x%08X, 0x%08X)\n",
212 wptr, adev->irq.ih.rptr, tmp);
213 adev->irq.ih.rptr = tmp;
214
215 tmp = RREG32_NO_KIQ(SOC15_REG_OFFSET(OSSSYS, 0, mmIH_RB_CNTL));
216 tmp = REG_SET_FIELD(tmp, IH_RB_CNTL, WPTR_OVERFLOW_CLEAR, 1);
217 WREG32_NO_KIQ(SOC15_REG_OFFSET(OSSSYS, 0, mmIH_RB_CNTL), tmp);
218 }
219 return (wptr & adev->irq.ih.ptr_mask);
220}
221
222/**
223 * vega10_ih_prescreen_iv - prescreen an interrupt vector
224 *
225 * @adev: amdgpu_device pointer
226 *
227 * Returns true if the interrupt vector should be further processed.
228 */
229static bool vega10_ih_prescreen_iv(struct amdgpu_device *adev)
230{
231 u32 ring_index = adev->irq.ih.rptr >> 2;
232 u32 dw0, dw3, dw4, dw5;
233 u16 pasid;
234 u64 addr, key;
235 struct amdgpu_vm *vm;
236 int r;
237
238 dw0 = le32_to_cpu(adev->irq.ih.ring[ring_index + 0]);
239 dw3 = le32_to_cpu(adev->irq.ih.ring[ring_index + 3]);
240 dw4 = le32_to_cpu(adev->irq.ih.ring[ring_index + 4]);
241 dw5 = le32_to_cpu(adev->irq.ih.ring[ring_index + 5]);
242
243 /* Filter retry page faults, let only the first one pass. If
244 * there are too many outstanding faults, ignore them until
245 * some faults get cleared.
246 */
247 switch (dw0 & 0xff) {
248 case SOC15_IH_CLIENTID_VMC:
249 case SOC15_IH_CLIENTID_UTCL2:
250 break;
251 default:
252 /* Not a VM fault */
253 return true;
254 }
255
256 pasid = dw3 & 0xffff;
257 /* No PASID, can't identify faulting process */
258 if (!pasid)
259 return true;
260
261 /* Not a retry fault, check fault credit */
262 if (!(dw5 & 0x80)) {
263 if (!amdgpu_vm_pasid_fault_credit(adev, pasid))
264 goto ignore_iv;
265 return true;
266 }
267
268 addr = ((u64)(dw5 & 0xf) << 44) | ((u64)dw4 << 12);
269 key = AMDGPU_VM_FAULT(pasid, addr);
270 r = amdgpu_ih_add_fault(adev, key);
271
272 /* Hash table is full or the fault is already being processed,
273 * ignore further page faults
274 */
275 if (r != 0)
276 goto ignore_iv;
277
278 /* Track retry faults in per-VM fault FIFO. */
279 spin_lock(&adev->vm_manager.pasid_lock);
280 vm = idr_find(&adev->vm_manager.pasid_idr, pasid);
281 if (!vm) {
282 /* VM not found, process it normally */
283 spin_unlock(&adev->vm_manager.pasid_lock);
284 amdgpu_ih_clear_fault(adev, key);
285 return true;
286 }
287 /* No locking required with single writer and single reader */
288 r = kfifo_put(&vm->faults, key);
289 if (!r) {
290 /* FIFO is full. Ignore it until there is space */
291 spin_unlock(&adev->vm_manager.pasid_lock);
292 amdgpu_ih_clear_fault(adev, key);
293 goto ignore_iv;
294 }
295 spin_unlock(&adev->vm_manager.pasid_lock);
296
297 /* It's the first fault for this address, process it normally */
298 return true;
299
300ignore_iv:
301 adev->irq.ih.rptr += 32;
302 return false;
303}
304
305/**
306 * vega10_ih_decode_iv - decode an interrupt vector
307 *
308 * @adev: amdgpu_device pointer
309 *
310 * Decodes the interrupt vector at the current rptr
311 * position and also advance the position.
312 */
313static void vega10_ih_decode_iv(struct amdgpu_device *adev,
314 struct amdgpu_iv_entry *entry)
315{
316 /* wptr/rptr are in bytes! */
317 u32 ring_index = adev->irq.ih.rptr >> 2;
318 uint32_t dw[8];
319
320 dw[0] = le32_to_cpu(adev->irq.ih.ring[ring_index + 0]);
321 dw[1] = le32_to_cpu(adev->irq.ih.ring[ring_index + 1]);
322 dw[2] = le32_to_cpu(adev->irq.ih.ring[ring_index + 2]);
323 dw[3] = le32_to_cpu(adev->irq.ih.ring[ring_index + 3]);
324 dw[4] = le32_to_cpu(adev->irq.ih.ring[ring_index + 4]);
325 dw[5] = le32_to_cpu(adev->irq.ih.ring[ring_index + 5]);
326 dw[6] = le32_to_cpu(adev->irq.ih.ring[ring_index + 6]);
327 dw[7] = le32_to_cpu(adev->irq.ih.ring[ring_index + 7]);
328
329 entry->client_id = dw[0] & 0xff;
330 entry->src_id = (dw[0] >> 8) & 0xff;
331 entry->ring_id = (dw[0] >> 16) & 0xff;
332 entry->vmid = (dw[0] >> 24) & 0xf;
333 entry->vmid_src = (dw[0] >> 31);
334 entry->timestamp = dw[1] | ((u64)(dw[2] & 0xffff) << 32);
335 entry->timestamp_src = dw[2] >> 31;
336 entry->pasid = dw[3] & 0xffff;
337 entry->pasid_src = dw[3] >> 31;
338 entry->src_data[0] = dw[4];
339 entry->src_data[1] = dw[5];
340 entry->src_data[2] = dw[6];
341 entry->src_data[3] = dw[7];
342
343
344 /* wptr/rptr are in bytes! */
345 adev->irq.ih.rptr += 32;
346}
347
348/**
349 * vega10_ih_set_rptr - set the IH ring buffer rptr
350 *
351 * @adev: amdgpu_device pointer
352 *
353 * Set the IH ring buffer rptr.
354 */
355static void vega10_ih_set_rptr(struct amdgpu_device *adev)
356{
357 if (adev->irq.ih.use_doorbell) {
358 /* XXX check if swapping is necessary on BE */
359 if (adev->irq.ih.use_bus_addr)
360 adev->irq.ih.ring[adev->irq.ih.rptr_offs] = adev->irq.ih.rptr;
361 else
362 adev->wb.wb[adev->irq.ih.rptr_offs] = adev->irq.ih.rptr;
363 WDOORBELL32(adev->irq.ih.doorbell_index, adev->irq.ih.rptr);
364 } else {
365 WREG32_SOC15(OSSSYS, 0, mmIH_RB_RPTR, adev->irq.ih.rptr);
366 }
367}
368
369static int vega10_ih_early_init(void *handle)
370{
371 struct amdgpu_device *adev = (struct amdgpu_device *)handle;
372
373 vega10_ih_set_interrupt_funcs(adev);
374 return 0;
375}
376
377static int vega10_ih_sw_init(void *handle)
378{
379 int r;
380 struct amdgpu_device *adev = (struct amdgpu_device *)handle;
381
382 r = amdgpu_ih_ring_init(adev, 256 * 1024, true);
383 if (r)
384 return r;
385
386 adev->irq.ih.use_doorbell = true;
387 adev->irq.ih.doorbell_index = AMDGPU_DOORBELL64_IH << 1;
388
389 adev->irq.ih.faults = kmalloc(sizeof(*adev->irq.ih.faults), GFP_KERNEL);
390 if (!adev->irq.ih.faults)
391 return -ENOMEM;
392 INIT_CHASH_TABLE(adev->irq.ih.faults->hash,
393 AMDGPU_PAGEFAULT_HASH_BITS, 8, 0);
394 spin_lock_init(&adev->irq.ih.faults->lock);
395 adev->irq.ih.faults->count = 0;
396
397 r = amdgpu_irq_init(adev);
398
399 return r;
400}
401
402static int vega10_ih_sw_fini(void *handle)
403{
404 struct amdgpu_device *adev = (struct amdgpu_device *)handle;
405
406 amdgpu_irq_fini(adev);
407 amdgpu_ih_ring_fini(adev);
408
409 kfree(adev->irq.ih.faults);
410 adev->irq.ih.faults = NULL;
411
412 return 0;
413}
414
415static int vega10_ih_hw_init(void *handle)
416{
417 int r;
418 struct amdgpu_device *adev = (struct amdgpu_device *)handle;
419
420 r = vega10_ih_irq_init(adev);
421 if (r)
422 return r;
423
424 return 0;
425}
426
427static int vega10_ih_hw_fini(void *handle)
428{
429 struct amdgpu_device *adev = (struct amdgpu_device *)handle;
430
431 vega10_ih_irq_disable(adev);
432
433 return 0;
434}
435
436static int vega10_ih_suspend(void *handle)
437{
438 struct amdgpu_device *adev = (struct amdgpu_device *)handle;
439
440 return vega10_ih_hw_fini(adev);
441}
442
443static int vega10_ih_resume(void *handle)
444{
445 struct amdgpu_device *adev = (struct amdgpu_device *)handle;
446
447 return vega10_ih_hw_init(adev);
448}
449
450static bool vega10_ih_is_idle(void *handle)
451{
452 /* todo */
453 return true;
454}
455
456static int vega10_ih_wait_for_idle(void *handle)
457{
458 /* todo */
459 return -ETIMEDOUT;
460}
461
462static int vega10_ih_soft_reset(void *handle)
463{
464 /* todo */
465
466 return 0;
467}
468
469static int vega10_ih_set_clockgating_state(void *handle,
470 enum amd_clockgating_state state)
471{
472 return 0;
473}
474
475static int vega10_ih_set_powergating_state(void *handle,
476 enum amd_powergating_state state)
477{
478 return 0;
479}
480
481const struct amd_ip_funcs vega10_ih_ip_funcs = {
482 .name = "vega10_ih",
483 .early_init = vega10_ih_early_init,
484 .late_init = NULL,
485 .sw_init = vega10_ih_sw_init,
486 .sw_fini = vega10_ih_sw_fini,
487 .hw_init = vega10_ih_hw_init,
488 .hw_fini = vega10_ih_hw_fini,
489 .suspend = vega10_ih_suspend,
490 .resume = vega10_ih_resume,
491 .is_idle = vega10_ih_is_idle,
492 .wait_for_idle = vega10_ih_wait_for_idle,
493 .soft_reset = vega10_ih_soft_reset,
494 .set_clockgating_state = vega10_ih_set_clockgating_state,
495 .set_powergating_state = vega10_ih_set_powergating_state,
496};
497
498static const struct amdgpu_ih_funcs vega10_ih_funcs = {
499 .get_wptr = vega10_ih_get_wptr,
500 .prescreen_iv = vega10_ih_prescreen_iv,
501 .decode_iv = vega10_ih_decode_iv,
502 .set_rptr = vega10_ih_set_rptr
503};
504
505static void vega10_ih_set_interrupt_funcs(struct amdgpu_device *adev)
506{
507 if (adev->irq.ih_funcs == NULL)
508 adev->irq.ih_funcs = &vega10_ih_funcs;
509}
510
511const struct amdgpu_ip_block_version vega10_ih_ip_block =
512{
513 .type = AMD_IP_BLOCK_TYPE_IH,
514 .major = 4,
515 .minor = 0,
516 .rev = 0,
517 .funcs = &vega10_ih_ip_funcs,
518};