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/pci.h>
25
26#include "amdgpu.h"
27#include "amdgpu_ih.h"
28#include "vid.h"
29
30#include "oss/oss_3_0_d.h"
31#include "oss/oss_3_0_sh_mask.h"
32
33#include "bif/bif_5_1_d.h"
34#include "bif/bif_5_1_sh_mask.h"
35
36/*
37 * Interrupts
38 * Starting with r6xx, interrupts are handled via a ring buffer.
39 * Ring buffers are areas of GPU accessible memory that the GPU
40 * writes interrupt vectors into and the host reads vectors out of.
41 * There is a rptr (read pointer) that determines where the
42 * host is currently reading, and a wptr (write pointer)
43 * which determines where the GPU has written. When the
44 * pointers are equal, the ring is idle. When the GPU
45 * writes vectors to the ring buffer, it increments the
46 * wptr. When there is an interrupt, the host then starts
47 * fetching commands and processing them until the pointers are
48 * equal again at which point it updates the rptr.
49 */
50
51static void tonga_ih_set_interrupt_funcs(struct amdgpu_device *adev);
52
53/**
54 * tonga_ih_enable_interrupts - Enable the interrupt ring buffer
55 *
56 * @adev: amdgpu_device pointer
57 *
58 * Enable the interrupt ring buffer (VI).
59 */
60static void tonga_ih_enable_interrupts(struct amdgpu_device *adev)
61{
62 u32 ih_rb_cntl = RREG32(mmIH_RB_CNTL);
63
64 ih_rb_cntl = REG_SET_FIELD(ih_rb_cntl, IH_RB_CNTL, RB_ENABLE, 1);
65 ih_rb_cntl = REG_SET_FIELD(ih_rb_cntl, IH_RB_CNTL, ENABLE_INTR, 1);
66 WREG32(mmIH_RB_CNTL, ih_rb_cntl);
67 adev->irq.ih.enabled = true;
68}
69
70/**
71 * tonga_ih_disable_interrupts - Disable the interrupt ring buffer
72 *
73 * @adev: amdgpu_device pointer
74 *
75 * Disable the interrupt ring buffer (VI).
76 */
77static void tonga_ih_disable_interrupts(struct amdgpu_device *adev)
78{
79 u32 ih_rb_cntl = RREG32(mmIH_RB_CNTL);
80
81 ih_rb_cntl = REG_SET_FIELD(ih_rb_cntl, IH_RB_CNTL, RB_ENABLE, 0);
82 ih_rb_cntl = REG_SET_FIELD(ih_rb_cntl, IH_RB_CNTL, ENABLE_INTR, 0);
83 WREG32(mmIH_RB_CNTL, ih_rb_cntl);
84 /* set rptr, wptr to 0 */
85 WREG32(mmIH_RB_RPTR, 0);
86 WREG32(mmIH_RB_WPTR, 0);
87 adev->irq.ih.enabled = false;
88 adev->irq.ih.rptr = 0;
89}
90
91/**
92 * tonga_ih_irq_init - init and enable the interrupt ring
93 *
94 * @adev: amdgpu_device pointer
95 *
96 * Allocate a ring buffer for the interrupt controller,
97 * enable the RLC, disable interrupts, enable the IH
98 * ring buffer and enable it (VI).
99 * Called at device load and reume.
100 * Returns 0 for success, errors for failure.
101 */
102static int tonga_ih_irq_init(struct amdgpu_device *adev)
103{
104 u32 interrupt_cntl, ih_rb_cntl, ih_doorbell_rtpr;
105 struct amdgpu_ih_ring *ih = &adev->irq.ih;
106 int rb_bufsz;
107
108 /* disable irqs */
109 tonga_ih_disable_interrupts(adev);
110
111 /* setup interrupt control */
112 WREG32(mmINTERRUPT_CNTL2, adev->dummy_page_addr >> 8);
113 interrupt_cntl = RREG32(mmINTERRUPT_CNTL);
114 /* INTERRUPT_CNTL__IH_DUMMY_RD_OVERRIDE_MASK=0 - dummy read disabled with msi, enabled without msi
115 * INTERRUPT_CNTL__IH_DUMMY_RD_OVERRIDE_MASK=1 - dummy read controlled by IH_DUMMY_RD_EN
116 */
117 interrupt_cntl = REG_SET_FIELD(interrupt_cntl, INTERRUPT_CNTL, IH_DUMMY_RD_OVERRIDE, 0);
118 /* INTERRUPT_CNTL__IH_REQ_NONSNOOP_EN_MASK=1 if ring is in non-cacheable memory, e.g., vram */
119 interrupt_cntl = REG_SET_FIELD(interrupt_cntl, INTERRUPT_CNTL, IH_REQ_NONSNOOP_EN, 0);
120 WREG32(mmINTERRUPT_CNTL, interrupt_cntl);
121
122 /* Ring Buffer base. [39:8] of 40-bit address of the beginning of the ring buffer*/
123 WREG32(mmIH_RB_BASE, ih->gpu_addr >> 8);
124
125 rb_bufsz = order_base_2(adev->irq.ih.ring_size / 4);
126 ih_rb_cntl = REG_SET_FIELD(0, IH_RB_CNTL, WPTR_OVERFLOW_CLEAR, 1);
127 ih_rb_cntl = REG_SET_FIELD(ih_rb_cntl, IH_RB_CNTL, RB_SIZE, rb_bufsz);
128 /* Ring Buffer write pointer writeback. If enabled, IH_RB_WPTR register value is written to memory */
129 ih_rb_cntl = REG_SET_FIELD(ih_rb_cntl, IH_RB_CNTL, WPTR_WRITEBACK_ENABLE, 1);
130 ih_rb_cntl = REG_SET_FIELD(ih_rb_cntl, IH_RB_CNTL, MC_VMID, 0);
131
132 if (adev->irq.msi_enabled)
133 ih_rb_cntl = REG_SET_FIELD(ih_rb_cntl, IH_RB_CNTL, RPTR_REARM, 1);
134
135 WREG32(mmIH_RB_CNTL, ih_rb_cntl);
136
137 /* set the writeback address whether it's enabled or not */
138 WREG32(mmIH_RB_WPTR_ADDR_LO, lower_32_bits(ih->wptr_addr));
139 WREG32(mmIH_RB_WPTR_ADDR_HI, upper_32_bits(ih->wptr_addr) & 0xFF);
140
141 /* set rptr, wptr to 0 */
142 WREG32(mmIH_RB_RPTR, 0);
143 WREG32(mmIH_RB_WPTR, 0);
144
145 ih_doorbell_rtpr = RREG32(mmIH_DOORBELL_RPTR);
146 if (adev->irq.ih.use_doorbell) {
147 ih_doorbell_rtpr = REG_SET_FIELD(ih_doorbell_rtpr, IH_DOORBELL_RPTR,
148 OFFSET, adev->irq.ih.doorbell_index);
149 ih_doorbell_rtpr = REG_SET_FIELD(ih_doorbell_rtpr, IH_DOORBELL_RPTR,
150 ENABLE, 1);
151 } else {
152 ih_doorbell_rtpr = REG_SET_FIELD(ih_doorbell_rtpr, IH_DOORBELL_RPTR,
153 ENABLE, 0);
154 }
155 WREG32(mmIH_DOORBELL_RPTR, ih_doorbell_rtpr);
156
157 pci_set_master(dev: adev->pdev);
158
159 /* enable interrupts */
160 tonga_ih_enable_interrupts(adev);
161
162 if (adev->irq.ih_soft.ring_size)
163 adev->irq.ih_soft.enabled = true;
164
165 return 0;
166}
167
168/**
169 * tonga_ih_irq_disable - disable interrupts
170 *
171 * @adev: amdgpu_device pointer
172 *
173 * Disable interrupts on the hw (VI).
174 */
175static void tonga_ih_irq_disable(struct amdgpu_device *adev)
176{
177 tonga_ih_disable_interrupts(adev);
178
179 /* Wait and acknowledge irq */
180 mdelay(1);
181}
182
183/**
184 * tonga_ih_get_wptr - get the IH ring buffer wptr
185 *
186 * @adev: amdgpu_device pointer
187 * @ih: IH ring buffer to fetch wptr
188 *
189 * Get the IH ring buffer wptr from either the register
190 * or the writeback memory buffer (VI). Also check for
191 * ring buffer overflow and deal with it.
192 * Used by cz_irq_process(VI).
193 * Returns the value of the wptr.
194 */
195static u32 tonga_ih_get_wptr(struct amdgpu_device *adev,
196 struct amdgpu_ih_ring *ih)
197{
198 u32 wptr, tmp;
199
200 wptr = le32_to_cpu(*ih->wptr_cpu);
201
202 if (ih == &adev->irq.ih_soft)
203 goto out;
204
205 if (!REG_GET_FIELD(wptr, IH_RB_WPTR, RB_OVERFLOW))
206 goto out;
207
208 /* Double check that the overflow wasn't already cleared. */
209 wptr = RREG32(mmIH_RB_WPTR);
210
211 if (!REG_GET_FIELD(wptr, IH_RB_WPTR, RB_OVERFLOW))
212 goto out;
213
214 wptr = REG_SET_FIELD(wptr, IH_RB_WPTR, RB_OVERFLOW, 0);
215
216 /* When a ring buffer overflow happen start parsing interrupt
217 * from the last not overwritten vector (wptr + 16). Hopefully
218 * this should allow us to catchup.
219 */
220
221 dev_warn(adev->dev, "IH ring buffer overflow (0x%08X, 0x%08X, 0x%08X)\n",
222 wptr, ih->rptr, (wptr + 16) & ih->ptr_mask);
223 ih->rptr = (wptr + 16) & ih->ptr_mask;
224 tmp = RREG32(mmIH_RB_CNTL);
225 tmp = REG_SET_FIELD(tmp, IH_RB_CNTL, WPTR_OVERFLOW_CLEAR, 1);
226 WREG32(mmIH_RB_CNTL, tmp);
227
228 /* Unset the CLEAR_OVERFLOW bit immediately so new overflows
229 * can be detected.
230 */
231 tmp = REG_SET_FIELD(tmp, IH_RB_CNTL, WPTR_OVERFLOW_CLEAR, 0);
232 WREG32(mmIH_RB_CNTL, tmp);
233
234out:
235 return (wptr & ih->ptr_mask);
236}
237
238/**
239 * tonga_ih_decode_iv - decode an interrupt vector
240 *
241 * @adev: amdgpu_device pointer
242 * @ih: IH ring buffer to decode
243 * @entry: IV entry to place decoded information into
244 *
245 * Decodes the interrupt vector at the current rptr
246 * position and also advance the position.
247 */
248static void tonga_ih_decode_iv(struct amdgpu_device *adev,
249 struct amdgpu_ih_ring *ih,
250 struct amdgpu_iv_entry *entry)
251{
252 /* wptr/rptr are in bytes! */
253 u32 ring_index = ih->rptr >> 2;
254 uint32_t dw[4];
255
256 dw[0] = le32_to_cpu(ih->ring[ring_index + 0]);
257 dw[1] = le32_to_cpu(ih->ring[ring_index + 1]);
258 dw[2] = le32_to_cpu(ih->ring[ring_index + 2]);
259 dw[3] = le32_to_cpu(ih->ring[ring_index + 3]);
260
261 entry->client_id = AMDGPU_IRQ_CLIENTID_LEGACY;
262 entry->src_id = dw[0] & 0xff;
263 entry->src_data[0] = dw[1] & 0xfffffff;
264 entry->ring_id = dw[2] & 0xff;
265 entry->vmid = (dw[2] >> 8) & 0xff;
266 entry->pasid = (dw[2] >> 16) & 0xffff;
267
268 /* wptr/rptr are in bytes! */
269 ih->rptr += 16;
270}
271
272/**
273 * tonga_ih_set_rptr - set the IH ring buffer rptr
274 *
275 * @adev: amdgpu_device pointer
276 * @ih: IH ring buffer to set rptr
277 *
278 * Set the IH ring buffer rptr.
279 */
280static void tonga_ih_set_rptr(struct amdgpu_device *adev,
281 struct amdgpu_ih_ring *ih)
282{
283 if (ih->use_doorbell) {
284 /* XXX check if swapping is necessary on BE */
285 *ih->rptr_cpu = ih->rptr;
286 WDOORBELL32(ih->doorbell_index, ih->rptr);
287 } else {
288 WREG32(mmIH_RB_RPTR, ih->rptr);
289 }
290}
291
292static int tonga_ih_early_init(struct amdgpu_ip_block *ip_block)
293{
294 struct amdgpu_device *adev = ip_block->adev;
295 int ret;
296
297 ret = amdgpu_irq_add_domain(adev);
298 if (ret)
299 return ret;
300
301 tonga_ih_set_interrupt_funcs(adev);
302
303 return 0;
304}
305
306static int tonga_ih_sw_init(struct amdgpu_ip_block *ip_block)
307{
308 int r;
309 struct amdgpu_device *adev = ip_block->adev;
310
311 r = amdgpu_ih_ring_init(adev, ih: &adev->irq.ih, ring_size: 64 * 1024, use_bus_addr: true);
312 if (r)
313 return r;
314
315 r = amdgpu_ih_ring_init(adev, ih: &adev->irq.ih_soft, IH_SW_RING_SIZE, use_bus_addr: true);
316 if (r)
317 return r;
318
319 adev->irq.ih.use_doorbell = true;
320 adev->irq.ih.doorbell_index = adev->doorbell_index.ih;
321
322 r = amdgpu_irq_init(adev);
323
324 return r;
325}
326
327static int tonga_ih_sw_fini(struct amdgpu_ip_block *ip_block)
328{
329 struct amdgpu_device *adev = ip_block->adev;
330
331 amdgpu_irq_fini_sw(adev);
332 amdgpu_irq_remove_domain(adev);
333
334 return 0;
335}
336
337static int tonga_ih_hw_init(struct amdgpu_ip_block *ip_block)
338{
339 int r;
340 struct amdgpu_device *adev = ip_block->adev;
341
342 r = tonga_ih_irq_init(adev);
343 if (r)
344 return r;
345
346 return 0;
347}
348
349static int tonga_ih_hw_fini(struct amdgpu_ip_block *ip_block)
350{
351 tonga_ih_irq_disable(adev: ip_block->adev);
352
353 return 0;
354}
355
356static int tonga_ih_suspend(struct amdgpu_ip_block *ip_block)
357{
358 return tonga_ih_hw_fini(ip_block);
359}
360
361static int tonga_ih_resume(struct amdgpu_ip_block *ip_block)
362{
363 return tonga_ih_hw_init(ip_block);
364}
365
366static bool tonga_ih_is_idle(struct amdgpu_ip_block *ip_block)
367{
368 struct amdgpu_device *adev = ip_block->adev;
369 u32 tmp = RREG32(mmSRBM_STATUS);
370
371 if (REG_GET_FIELD(tmp, SRBM_STATUS, IH_BUSY))
372 return false;
373
374 return true;
375}
376
377static int tonga_ih_wait_for_idle(struct amdgpu_ip_block *ip_block)
378{
379 unsigned i;
380 u32 tmp;
381 struct amdgpu_device *adev = ip_block->adev;
382
383 for (i = 0; i < adev->usec_timeout; i++) {
384 /* read MC_STATUS */
385 tmp = RREG32(mmSRBM_STATUS);
386 if (!REG_GET_FIELD(tmp, SRBM_STATUS, IH_BUSY))
387 return 0;
388 udelay(usec: 1);
389 }
390 return -ETIMEDOUT;
391}
392
393static bool tonga_ih_check_soft_reset(struct amdgpu_ip_block *ip_block)
394{
395 struct amdgpu_device *adev = ip_block->adev;
396 u32 srbm_soft_reset = 0;
397 u32 tmp = RREG32(mmSRBM_STATUS);
398
399 if (tmp & SRBM_STATUS__IH_BUSY_MASK)
400 srbm_soft_reset = REG_SET_FIELD(srbm_soft_reset, SRBM_SOFT_RESET,
401 SOFT_RESET_IH, 1);
402
403 if (srbm_soft_reset) {
404 adev->irq.srbm_soft_reset = srbm_soft_reset;
405 return true;
406 } else {
407 adev->irq.srbm_soft_reset = 0;
408 return false;
409 }
410}
411
412static int tonga_ih_pre_soft_reset(struct amdgpu_ip_block *ip_block)
413{
414 if (!ip_block->adev->irq.srbm_soft_reset)
415 return 0;
416
417 return tonga_ih_hw_fini(ip_block);
418}
419
420static int tonga_ih_post_soft_reset(struct amdgpu_ip_block *ip_block)
421{
422 struct amdgpu_device *adev = ip_block->adev;
423
424 if (!adev->irq.srbm_soft_reset)
425 return 0;
426
427 return tonga_ih_hw_init(ip_block);
428}
429
430static int tonga_ih_soft_reset(struct amdgpu_ip_block *ip_block)
431{
432 struct amdgpu_device *adev = ip_block->adev;
433 u32 srbm_soft_reset;
434
435 if (!adev->irq.srbm_soft_reset)
436 return 0;
437 srbm_soft_reset = adev->irq.srbm_soft_reset;
438
439 if (srbm_soft_reset) {
440 u32 tmp;
441
442 tmp = RREG32(mmSRBM_SOFT_RESET);
443 tmp |= srbm_soft_reset;
444 dev_info(adev->dev, "SRBM_SOFT_RESET=0x%08X\n", tmp);
445 WREG32(mmSRBM_SOFT_RESET, tmp);
446 tmp = RREG32(mmSRBM_SOFT_RESET);
447
448 udelay(usec: 50);
449
450 tmp &= ~srbm_soft_reset;
451 WREG32(mmSRBM_SOFT_RESET, tmp);
452 tmp = RREG32(mmSRBM_SOFT_RESET);
453
454 /* Wait a little for things to settle down */
455 udelay(usec: 50);
456 }
457
458 return 0;
459}
460
461static int tonga_ih_set_clockgating_state(struct amdgpu_ip_block *ip_block,
462 enum amd_clockgating_state state)
463{
464 return 0;
465}
466
467static int tonga_ih_set_powergating_state(struct amdgpu_ip_block *ip_block,
468 enum amd_powergating_state state)
469{
470 return 0;
471}
472
473static const struct amd_ip_funcs tonga_ih_ip_funcs = {
474 .name = "tonga_ih",
475 .early_init = tonga_ih_early_init,
476 .sw_init = tonga_ih_sw_init,
477 .sw_fini = tonga_ih_sw_fini,
478 .hw_init = tonga_ih_hw_init,
479 .hw_fini = tonga_ih_hw_fini,
480 .suspend = tonga_ih_suspend,
481 .resume = tonga_ih_resume,
482 .is_idle = tonga_ih_is_idle,
483 .wait_for_idle = tonga_ih_wait_for_idle,
484 .check_soft_reset = tonga_ih_check_soft_reset,
485 .pre_soft_reset = tonga_ih_pre_soft_reset,
486 .soft_reset = tonga_ih_soft_reset,
487 .post_soft_reset = tonga_ih_post_soft_reset,
488 .set_clockgating_state = tonga_ih_set_clockgating_state,
489 .set_powergating_state = tonga_ih_set_powergating_state,
490};
491
492static const struct amdgpu_ih_funcs tonga_ih_funcs = {
493 .get_wptr = tonga_ih_get_wptr,
494 .decode_iv = tonga_ih_decode_iv,
495 .set_rptr = tonga_ih_set_rptr
496};
497
498static void tonga_ih_set_interrupt_funcs(struct amdgpu_device *adev)
499{
500 adev->irq.ih_funcs = &tonga_ih_funcs;
501}
502
503const struct amdgpu_ip_block_version tonga_ih_ip_block = {
504 .type = AMD_IP_BLOCK_TYPE_IH,
505 .major = 3,
506 .minor = 0,
507 .rev = 0,
508 .funcs = &tonga_ih_ip_funcs,
509};
510

source code of linux/drivers/gpu/drm/amd/amdgpu/tonga_ih.c