Merge tag 'tpmdd-next-6.10-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git...
[linux-2.6-block.git] / drivers / gpu / drm / amd / amdgpu / tonga_ih.c
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
51 static 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  */
60 static 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  */
77 static 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  */
102 static 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(adev->pdev);
158
159         /* enable interrupts */
160         tonga_ih_enable_interrupts(adev);
161
162         return 0;
163 }
164
165 /**
166  * tonga_ih_irq_disable - disable interrupts
167  *
168  * @adev: amdgpu_device pointer
169  *
170  * Disable interrupts on the hw (VI).
171  */
172 static void tonga_ih_irq_disable(struct amdgpu_device *adev)
173 {
174         tonga_ih_disable_interrupts(adev);
175
176         /* Wait and acknowledge irq */
177         mdelay(1);
178 }
179
180 /**
181  * tonga_ih_get_wptr - get the IH ring buffer wptr
182  *
183  * @adev: amdgpu_device pointer
184  * @ih: IH ring buffer to fetch wptr
185  *
186  * Get the IH ring buffer wptr from either the register
187  * or the writeback memory buffer (VI).  Also check for
188  * ring buffer overflow and deal with it.
189  * Used by cz_irq_process(VI).
190  * Returns the value of the wptr.
191  */
192 static u32 tonga_ih_get_wptr(struct amdgpu_device *adev,
193                              struct amdgpu_ih_ring *ih)
194 {
195         u32 wptr, tmp;
196
197         wptr = le32_to_cpu(*ih->wptr_cpu);
198
199         if (!REG_GET_FIELD(wptr, IH_RB_WPTR, RB_OVERFLOW))
200                 goto out;
201
202         /* Double check that the overflow wasn't already cleared. */
203         wptr = RREG32(mmIH_RB_WPTR);
204
205         if (!REG_GET_FIELD(wptr, IH_RB_WPTR, RB_OVERFLOW))
206                 goto out;
207
208         wptr = REG_SET_FIELD(wptr, IH_RB_WPTR, RB_OVERFLOW, 0);
209
210         /* When a ring buffer overflow happen start parsing interrupt
211          * from the last not overwritten vector (wptr + 16). Hopefully
212          * this should allow us to catchup.
213          */
214
215         dev_warn(adev->dev, "IH ring buffer overflow (0x%08X, 0x%08X, 0x%08X)\n",
216                 wptr, ih->rptr, (wptr + 16) & ih->ptr_mask);
217         ih->rptr = (wptr + 16) & ih->ptr_mask;
218         tmp = RREG32(mmIH_RB_CNTL);
219         tmp = REG_SET_FIELD(tmp, IH_RB_CNTL, WPTR_OVERFLOW_CLEAR, 1);
220         WREG32(mmIH_RB_CNTL, tmp);
221
222         /* Unset the CLEAR_OVERFLOW bit immediately so new overflows
223          * can be detected.
224          */
225         tmp = REG_SET_FIELD(tmp, IH_RB_CNTL, WPTR_OVERFLOW_CLEAR, 0);
226         WREG32(mmIH_RB_CNTL, tmp);
227
228 out:
229         return (wptr & ih->ptr_mask);
230 }
231
232 /**
233  * tonga_ih_decode_iv - decode an interrupt vector
234  *
235  * @adev: amdgpu_device pointer
236  * @ih: IH ring buffer to decode
237  * @entry: IV entry to place decoded information into
238  *
239  * Decodes the interrupt vector at the current rptr
240  * position and also advance the position.
241  */
242 static void tonga_ih_decode_iv(struct amdgpu_device *adev,
243                                struct amdgpu_ih_ring *ih,
244                                struct amdgpu_iv_entry *entry)
245 {
246         /* wptr/rptr are in bytes! */
247         u32 ring_index = ih->rptr >> 2;
248         uint32_t dw[4];
249
250         dw[0] = le32_to_cpu(ih->ring[ring_index + 0]);
251         dw[1] = le32_to_cpu(ih->ring[ring_index + 1]);
252         dw[2] = le32_to_cpu(ih->ring[ring_index + 2]);
253         dw[3] = le32_to_cpu(ih->ring[ring_index + 3]);
254
255         entry->client_id = AMDGPU_IRQ_CLIENTID_LEGACY;
256         entry->src_id = dw[0] & 0xff;
257         entry->src_data[0] = dw[1] & 0xfffffff;
258         entry->ring_id = dw[2] & 0xff;
259         entry->vmid = (dw[2] >> 8) & 0xff;
260         entry->pasid = (dw[2] >> 16) & 0xffff;
261
262         /* wptr/rptr are in bytes! */
263         ih->rptr += 16;
264 }
265
266 /**
267  * tonga_ih_set_rptr - set the IH ring buffer rptr
268  *
269  * @adev: amdgpu_device pointer
270  * @ih: IH ring buffer to set rptr
271  *
272  * Set the IH ring buffer rptr.
273  */
274 static void tonga_ih_set_rptr(struct amdgpu_device *adev,
275                               struct amdgpu_ih_ring *ih)
276 {
277         if (ih->use_doorbell) {
278                 /* XXX check if swapping is necessary on BE */
279                 *ih->rptr_cpu = ih->rptr;
280                 WDOORBELL32(ih->doorbell_index, ih->rptr);
281         } else {
282                 WREG32(mmIH_RB_RPTR, ih->rptr);
283         }
284 }
285
286 static int tonga_ih_early_init(void *handle)
287 {
288         struct amdgpu_device *adev = (struct amdgpu_device *)handle;
289         int ret;
290
291         ret = amdgpu_irq_add_domain(adev);
292         if (ret)
293                 return ret;
294
295         tonga_ih_set_interrupt_funcs(adev);
296
297         return 0;
298 }
299
300 static int tonga_ih_sw_init(void *handle)
301 {
302         int r;
303         struct amdgpu_device *adev = (struct amdgpu_device *)handle;
304
305         r = amdgpu_ih_ring_init(adev, &adev->irq.ih, 64 * 1024, true);
306         if (r)
307                 return r;
308
309         adev->irq.ih.use_doorbell = true;
310         adev->irq.ih.doorbell_index = adev->doorbell_index.ih;
311
312         r = amdgpu_irq_init(adev);
313
314         return r;
315 }
316
317 static int tonga_ih_sw_fini(void *handle)
318 {
319         struct amdgpu_device *adev = (struct amdgpu_device *)handle;
320
321         amdgpu_irq_fini_sw(adev);
322         amdgpu_irq_remove_domain(adev);
323
324         return 0;
325 }
326
327 static int tonga_ih_hw_init(void *handle)
328 {
329         int r;
330         struct amdgpu_device *adev = (struct amdgpu_device *)handle;
331
332         r = tonga_ih_irq_init(adev);
333         if (r)
334                 return r;
335
336         return 0;
337 }
338
339 static int tonga_ih_hw_fini(void *handle)
340 {
341         struct amdgpu_device *adev = (struct amdgpu_device *)handle;
342
343         tonga_ih_irq_disable(adev);
344
345         return 0;
346 }
347
348 static int tonga_ih_suspend(void *handle)
349 {
350         struct amdgpu_device *adev = (struct amdgpu_device *)handle;
351
352         return tonga_ih_hw_fini(adev);
353 }
354
355 static int tonga_ih_resume(void *handle)
356 {
357         struct amdgpu_device *adev = (struct amdgpu_device *)handle;
358
359         return tonga_ih_hw_init(adev);
360 }
361
362 static bool tonga_ih_is_idle(void *handle)
363 {
364         struct amdgpu_device *adev = (struct amdgpu_device *)handle;
365         u32 tmp = RREG32(mmSRBM_STATUS);
366
367         if (REG_GET_FIELD(tmp, SRBM_STATUS, IH_BUSY))
368                 return false;
369
370         return true;
371 }
372
373 static int tonga_ih_wait_for_idle(void *handle)
374 {
375         unsigned i;
376         u32 tmp;
377         struct amdgpu_device *adev = (struct amdgpu_device *)handle;
378
379         for (i = 0; i < adev->usec_timeout; i++) {
380                 /* read MC_STATUS */
381                 tmp = RREG32(mmSRBM_STATUS);
382                 if (!REG_GET_FIELD(tmp, SRBM_STATUS, IH_BUSY))
383                         return 0;
384                 udelay(1);
385         }
386         return -ETIMEDOUT;
387 }
388
389 static bool tonga_ih_check_soft_reset(void *handle)
390 {
391         struct amdgpu_device *adev = (struct amdgpu_device *)handle;
392         u32 srbm_soft_reset = 0;
393         u32 tmp = RREG32(mmSRBM_STATUS);
394
395         if (tmp & SRBM_STATUS__IH_BUSY_MASK)
396                 srbm_soft_reset = REG_SET_FIELD(srbm_soft_reset, SRBM_SOFT_RESET,
397                                                 SOFT_RESET_IH, 1);
398
399         if (srbm_soft_reset) {
400                 adev->irq.srbm_soft_reset = srbm_soft_reset;
401                 return true;
402         } else {
403                 adev->irq.srbm_soft_reset = 0;
404                 return false;
405         }
406 }
407
408 static int tonga_ih_pre_soft_reset(void *handle)
409 {
410         struct amdgpu_device *adev = (struct amdgpu_device *)handle;
411
412         if (!adev->irq.srbm_soft_reset)
413                 return 0;
414
415         return tonga_ih_hw_fini(adev);
416 }
417
418 static int tonga_ih_post_soft_reset(void *handle)
419 {
420         struct amdgpu_device *adev = (struct amdgpu_device *)handle;
421
422         if (!adev->irq.srbm_soft_reset)
423                 return 0;
424
425         return tonga_ih_hw_init(adev);
426 }
427
428 static int tonga_ih_soft_reset(void *handle)
429 {
430         struct amdgpu_device *adev = (struct amdgpu_device *)handle;
431         u32 srbm_soft_reset;
432
433         if (!adev->irq.srbm_soft_reset)
434                 return 0;
435         srbm_soft_reset = adev->irq.srbm_soft_reset;
436
437         if (srbm_soft_reset) {
438                 u32 tmp;
439
440                 tmp = RREG32(mmSRBM_SOFT_RESET);
441                 tmp |= srbm_soft_reset;
442                 dev_info(adev->dev, "SRBM_SOFT_RESET=0x%08X\n", tmp);
443                 WREG32(mmSRBM_SOFT_RESET, tmp);
444                 tmp = RREG32(mmSRBM_SOFT_RESET);
445
446                 udelay(50);
447
448                 tmp &= ~srbm_soft_reset;
449                 WREG32(mmSRBM_SOFT_RESET, tmp);
450                 tmp = RREG32(mmSRBM_SOFT_RESET);
451
452                 /* Wait a little for things to settle down */
453                 udelay(50);
454         }
455
456         return 0;
457 }
458
459 static int tonga_ih_set_clockgating_state(void *handle,
460                                           enum amd_clockgating_state state)
461 {
462         return 0;
463 }
464
465 static int tonga_ih_set_powergating_state(void *handle,
466                                           enum amd_powergating_state state)
467 {
468         return 0;
469 }
470
471 static const struct amd_ip_funcs tonga_ih_ip_funcs = {
472         .name = "tonga_ih",
473         .early_init = tonga_ih_early_init,
474         .late_init = NULL,
475         .sw_init = tonga_ih_sw_init,
476         .sw_fini = tonga_ih_sw_fini,
477         .hw_init = tonga_ih_hw_init,
478         .hw_fini = tonga_ih_hw_fini,
479         .suspend = tonga_ih_suspend,
480         .resume = tonga_ih_resume,
481         .is_idle = tonga_ih_is_idle,
482         .wait_for_idle = tonga_ih_wait_for_idle,
483         .check_soft_reset = tonga_ih_check_soft_reset,
484         .pre_soft_reset = tonga_ih_pre_soft_reset,
485         .soft_reset = tonga_ih_soft_reset,
486         .post_soft_reset = tonga_ih_post_soft_reset,
487         .set_clockgating_state = tonga_ih_set_clockgating_state,
488         .set_powergating_state = tonga_ih_set_powergating_state,
489         .dump_ip_state = NULL,
490         .print_ip_state = NULL,
491 };
492
493 static const struct amdgpu_ih_funcs tonga_ih_funcs = {
494         .get_wptr = tonga_ih_get_wptr,
495         .decode_iv = tonga_ih_decode_iv,
496         .set_rptr = tonga_ih_set_rptr
497 };
498
499 static void tonga_ih_set_interrupt_funcs(struct amdgpu_device *adev)
500 {
501         adev->irq.ih_funcs = &tonga_ih_funcs;
502 }
503
504 const struct amdgpu_ip_block_version tonga_ih_ip_block = {
505         .type = AMD_IP_BLOCK_TYPE_IH,
506         .major = 3,
507         .minor = 0,
508         .rev = 0,
509         .funcs = &tonga_ih_ip_funcs,
510 };