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_2_4_d.h"
31#include "oss/oss_2_4_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 iceland_ih_set_interrupt_funcs(struct amdgpu_device *adev);
52
53/**
54 * iceland_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 iceland_ih_enable_interrupts(struct amdgpu_device *adev)
61{
62 u32 ih_cntl = RREG32(mmIH_CNTL);
63 u32 ih_rb_cntl = RREG32(mmIH_RB_CNTL);
64
65 ih_cntl = REG_SET_FIELD(ih_cntl, IH_CNTL, ENABLE_INTR, 1);
66 ih_rb_cntl = REG_SET_FIELD(ih_rb_cntl, IH_RB_CNTL, RB_ENABLE, 1);
67 WREG32(mmIH_CNTL, ih_cntl);
68 WREG32(mmIH_RB_CNTL, ih_rb_cntl);
69 adev->irq.ih.enabled = true;
70}
71
72/**
73 * iceland_ih_disable_interrupts - Disable the interrupt ring buffer
74 *
75 * @adev: amdgpu_device pointer
76 *
77 * Disable the interrupt ring buffer (VI).
78 */
79static void iceland_ih_disable_interrupts(struct amdgpu_device *adev)
80{
81 u32 ih_rb_cntl = RREG32(mmIH_RB_CNTL);
82 u32 ih_cntl = RREG32(mmIH_CNTL);
83
84 ih_rb_cntl = REG_SET_FIELD(ih_rb_cntl, IH_RB_CNTL, RB_ENABLE, 0);
85 ih_cntl = REG_SET_FIELD(ih_cntl, IH_CNTL, ENABLE_INTR, 0);
86 WREG32(mmIH_RB_CNTL, ih_rb_cntl);
87 WREG32(mmIH_CNTL, ih_cntl);
88 /* set rptr, wptr to 0 */
89 WREG32(mmIH_RB_RPTR, 0);
90 WREG32(mmIH_RB_WPTR, 0);
91 adev->irq.ih.enabled = false;
92 adev->irq.ih.rptr = 0;
93}
94
95/**
96 * iceland_ih_irq_init - init and enable the interrupt ring
97 *
98 * @adev: amdgpu_device pointer
99 *
100 * Allocate a ring buffer for the interrupt controller,
101 * enable the RLC, disable interrupts, enable the IH
102 * ring buffer and enable it (VI).
103 * Called at device load and reume.
104 * Returns 0 for success, errors for failure.
105 */
106static int iceland_ih_irq_init(struct amdgpu_device *adev)
107{
108 struct amdgpu_ih_ring *ih = &adev->irq.ih;
109 int rb_bufsz;
110 u32 interrupt_cntl, ih_cntl, ih_rb_cntl;
111
112 /* disable irqs */
113 iceland_ih_disable_interrupts(adev);
114
115 /* setup interrupt control */
116 WREG32(mmINTERRUPT_CNTL2, adev->dummy_page_addr >> 8);
117 interrupt_cntl = RREG32(mmINTERRUPT_CNTL);
118 /* INTERRUPT_CNTL__IH_DUMMY_RD_OVERRIDE_MASK=0 - dummy read disabled with msi, enabled without msi
119 * INTERRUPT_CNTL__IH_DUMMY_RD_OVERRIDE_MASK=1 - dummy read controlled by IH_DUMMY_RD_EN
120 */
121 interrupt_cntl = REG_SET_FIELD(interrupt_cntl, INTERRUPT_CNTL, IH_DUMMY_RD_OVERRIDE, 0);
122 /* INTERRUPT_CNTL__IH_REQ_NONSNOOP_EN_MASK=1 if ring is in non-cacheable memory, e.g., vram */
123 interrupt_cntl = REG_SET_FIELD(interrupt_cntl, INTERRUPT_CNTL, IH_REQ_NONSNOOP_EN, 0);
124 WREG32(mmINTERRUPT_CNTL, interrupt_cntl);
125
126 /* Ring Buffer base. [39:8] of 40-bit address of the beginning of the ring buffer*/
127 WREG32(mmIH_RB_BASE, adev->irq.ih.gpu_addr >> 8);
128
129 rb_bufsz = order_base_2(adev->irq.ih.ring_size / 4);
130 ih_rb_cntl = REG_SET_FIELD(0, IH_RB_CNTL, WPTR_OVERFLOW_ENABLE, 1);
131 ih_rb_cntl = REG_SET_FIELD(ih_rb_cntl, IH_RB_CNTL, WPTR_OVERFLOW_CLEAR, 1);
132 ih_rb_cntl = REG_SET_FIELD(ih_rb_cntl, IH_RB_CNTL, RB_SIZE, rb_bufsz);
133
134 /* Ring Buffer write pointer writeback. If enabled, IH_RB_WPTR register value is written to memory */
135 ih_rb_cntl = REG_SET_FIELD(ih_rb_cntl, IH_RB_CNTL, WPTR_WRITEBACK_ENABLE, 1);
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 WREG32(mmIH_RB_CNTL, ih_rb_cntl);
142
143 /* set rptr, wptr to 0 */
144 WREG32(mmIH_RB_RPTR, 0);
145 WREG32(mmIH_RB_WPTR, 0);
146
147 /* Default settings for IH_CNTL (disabled at first) */
148 ih_cntl = RREG32(mmIH_CNTL);
149 ih_cntl = REG_SET_FIELD(ih_cntl, IH_CNTL, MC_VMID, 0);
150
151 if (adev->irq.msi_enabled)
152 ih_cntl = REG_SET_FIELD(ih_cntl, IH_CNTL, RPTR_REARM, 1);
153 WREG32(mmIH_CNTL, ih_cntl);
154
155 pci_set_master(dev: adev->pdev);
156
157 /* enable interrupts */
158 iceland_ih_enable_interrupts(adev);
159
160 return 0;
161}
162
163/**
164 * iceland_ih_irq_disable - disable interrupts
165 *
166 * @adev: amdgpu_device pointer
167 *
168 * Disable interrupts on the hw (VI).
169 */
170static void iceland_ih_irq_disable(struct amdgpu_device *adev)
171{
172 iceland_ih_disable_interrupts(adev);
173
174 /* Wait and acknowledge irq */
175 mdelay(1);
176}
177
178/**
179 * iceland_ih_get_wptr - get the IH ring buffer wptr
180 *
181 * @adev: amdgpu_device pointer
182 * @ih: IH ring buffer to fetch wptr
183 *
184 * Get the IH ring buffer wptr from either the register
185 * or the writeback memory buffer (VI). Also check for
186 * ring buffer overflow and deal with it.
187 * Used by cz_irq_process(VI).
188 * Returns the value of the wptr.
189 */
190static u32 iceland_ih_get_wptr(struct amdgpu_device *adev,
191 struct amdgpu_ih_ring *ih)
192{
193 u32 wptr, tmp;
194
195 wptr = le32_to_cpu(*ih->wptr_cpu);
196
197 if (!REG_GET_FIELD(wptr, IH_RB_WPTR, RB_OVERFLOW))
198 goto out;
199
200 /* Double check that the overflow wasn't already cleared. */
201 wptr = RREG32(mmIH_RB_WPTR);
202
203 if (!REG_GET_FIELD(wptr, IH_RB_WPTR, RB_OVERFLOW))
204 goto out;
205
206 wptr = REG_SET_FIELD(wptr, IH_RB_WPTR, RB_OVERFLOW, 0);
207 /* When a ring buffer overflow happen start parsing interrupt
208 * from the last not overwritten vector (wptr + 16). Hopefully
209 * this should allow us to catchup.
210 */
211 dev_warn(adev->dev, "IH ring buffer overflow (0x%08X, 0x%08X, 0x%08X)\n",
212 wptr, ih->rptr, (wptr + 16) & ih->ptr_mask);
213 ih->rptr = (wptr + 16) & ih->ptr_mask;
214 tmp = RREG32(mmIH_RB_CNTL);
215 tmp = REG_SET_FIELD(tmp, IH_RB_CNTL, WPTR_OVERFLOW_CLEAR, 1);
216 WREG32(mmIH_RB_CNTL, tmp);
217
218 /* Unset the CLEAR_OVERFLOW bit immediately so new overflows
219 * can be detected.
220 */
221 tmp = REG_SET_FIELD(tmp, IH_RB_CNTL, WPTR_OVERFLOW_CLEAR, 0);
222 WREG32(mmIH_RB_CNTL, tmp);
223
224out:
225 return (wptr & ih->ptr_mask);
226}
227
228/**
229 * iceland_ih_decode_iv - decode an interrupt vector
230 *
231 * @adev: amdgpu_device pointer
232 * @ih: IH ring buffer to decode
233 * @entry: IV entry to place decoded information into
234 *
235 * Decodes the interrupt vector at the current rptr
236 * position and also advance the position.
237 */
238static void iceland_ih_decode_iv(struct amdgpu_device *adev,
239 struct amdgpu_ih_ring *ih,
240 struct amdgpu_iv_entry *entry)
241{
242 /* wptr/rptr are in bytes! */
243 u32 ring_index = ih->rptr >> 2;
244 uint32_t dw[4];
245
246 dw[0] = le32_to_cpu(ih->ring[ring_index + 0]);
247 dw[1] = le32_to_cpu(ih->ring[ring_index + 1]);
248 dw[2] = le32_to_cpu(ih->ring[ring_index + 2]);
249 dw[3] = le32_to_cpu(ih->ring[ring_index + 3]);
250
251 entry->client_id = AMDGPU_IRQ_CLIENTID_LEGACY;
252 entry->src_id = dw[0] & 0xff;
253 entry->src_data[0] = dw[1] & 0xfffffff;
254 entry->ring_id = dw[2] & 0xff;
255 entry->vmid = (dw[2] >> 8) & 0xff;
256 entry->pasid = (dw[2] >> 16) & 0xffff;
257
258 /* wptr/rptr are in bytes! */
259 ih->rptr += 16;
260}
261
262/**
263 * iceland_ih_set_rptr - set the IH ring buffer rptr
264 *
265 * @adev: amdgpu_device pointer
266 * @ih: IH ring buffer to set rptr
267 *
268 * Set the IH ring buffer rptr.
269 */
270static void iceland_ih_set_rptr(struct amdgpu_device *adev,
271 struct amdgpu_ih_ring *ih)
272{
273 WREG32(mmIH_RB_RPTR, ih->rptr);
274}
275
276static int iceland_ih_early_init(void *handle)
277{
278 struct amdgpu_device *adev = (struct amdgpu_device *)handle;
279 int ret;
280
281 ret = amdgpu_irq_add_domain(adev);
282 if (ret)
283 return ret;
284
285 iceland_ih_set_interrupt_funcs(adev);
286
287 return 0;
288}
289
290static int iceland_ih_sw_init(void *handle)
291{
292 int r;
293 struct amdgpu_device *adev = (struct amdgpu_device *)handle;
294
295 r = amdgpu_ih_ring_init(adev, ih: &adev->irq.ih, ring_size: 64 * 1024, use_bus_addr: false);
296 if (r)
297 return r;
298
299 r = amdgpu_irq_init(adev);
300
301 return r;
302}
303
304static int iceland_ih_sw_fini(void *handle)
305{
306 struct amdgpu_device *adev = (struct amdgpu_device *)handle;
307
308 amdgpu_irq_fini_sw(adev);
309 amdgpu_irq_remove_domain(adev);
310
311 return 0;
312}
313
314static int iceland_ih_hw_init(void *handle)
315{
316 struct amdgpu_device *adev = (struct amdgpu_device *)handle;
317
318 return iceland_ih_irq_init(adev);
319}
320
321static int iceland_ih_hw_fini(void *handle)
322{
323 struct amdgpu_device *adev = (struct amdgpu_device *)handle;
324
325 iceland_ih_irq_disable(adev);
326
327 return 0;
328}
329
330static int iceland_ih_suspend(void *handle)
331{
332 struct amdgpu_device *adev = (struct amdgpu_device *)handle;
333
334 return iceland_ih_hw_fini(handle: adev);
335}
336
337static int iceland_ih_resume(void *handle)
338{
339 struct amdgpu_device *adev = (struct amdgpu_device *)handle;
340
341 return iceland_ih_hw_init(handle: adev);
342}
343
344static bool iceland_ih_is_idle(void *handle)
345{
346 struct amdgpu_device *adev = (struct amdgpu_device *)handle;
347 u32 tmp = RREG32(mmSRBM_STATUS);
348
349 if (REG_GET_FIELD(tmp, SRBM_STATUS, IH_BUSY))
350 return false;
351
352 return true;
353}
354
355static int iceland_ih_wait_for_idle(void *handle)
356{
357 unsigned i;
358 u32 tmp;
359 struct amdgpu_device *adev = (struct amdgpu_device *)handle;
360
361 for (i = 0; i < adev->usec_timeout; i++) {
362 /* read MC_STATUS */
363 tmp = RREG32(mmSRBM_STATUS);
364 if (!REG_GET_FIELD(tmp, SRBM_STATUS, IH_BUSY))
365 return 0;
366 udelay(1);
367 }
368 return -ETIMEDOUT;
369}
370
371static int iceland_ih_soft_reset(void *handle)
372{
373 u32 srbm_soft_reset = 0;
374 struct amdgpu_device *adev = (struct amdgpu_device *)handle;
375 u32 tmp = RREG32(mmSRBM_STATUS);
376
377 if (tmp & SRBM_STATUS__IH_BUSY_MASK)
378 srbm_soft_reset = REG_SET_FIELD(srbm_soft_reset, SRBM_SOFT_RESET,
379 SOFT_RESET_IH, 1);
380
381 if (srbm_soft_reset) {
382 tmp = RREG32(mmSRBM_SOFT_RESET);
383 tmp |= srbm_soft_reset;
384 dev_info(adev->dev, "SRBM_SOFT_RESET=0x%08X\n", tmp);
385 WREG32(mmSRBM_SOFT_RESET, tmp);
386 tmp = RREG32(mmSRBM_SOFT_RESET);
387
388 udelay(50);
389
390 tmp &= ~srbm_soft_reset;
391 WREG32(mmSRBM_SOFT_RESET, tmp);
392 tmp = RREG32(mmSRBM_SOFT_RESET);
393
394 /* Wait a little for things to settle down */
395 udelay(50);
396 }
397
398 return 0;
399}
400
401static int iceland_ih_set_clockgating_state(void *handle,
402 enum amd_clockgating_state state)
403{
404 return 0;
405}
406
407static int iceland_ih_set_powergating_state(void *handle,
408 enum amd_powergating_state state)
409{
410 return 0;
411}
412
413static const struct amd_ip_funcs iceland_ih_ip_funcs = {
414 .name = "iceland_ih",
415 .early_init = iceland_ih_early_init,
416 .late_init = NULL,
417 .sw_init = iceland_ih_sw_init,
418 .sw_fini = iceland_ih_sw_fini,
419 .hw_init = iceland_ih_hw_init,
420 .hw_fini = iceland_ih_hw_fini,
421 .suspend = iceland_ih_suspend,
422 .resume = iceland_ih_resume,
423 .is_idle = iceland_ih_is_idle,
424 .wait_for_idle = iceland_ih_wait_for_idle,
425 .soft_reset = iceland_ih_soft_reset,
426 .set_clockgating_state = iceland_ih_set_clockgating_state,
427 .set_powergating_state = iceland_ih_set_powergating_state,
428};
429
430static const struct amdgpu_ih_funcs iceland_ih_funcs = {
431 .get_wptr = iceland_ih_get_wptr,
432 .decode_iv = iceland_ih_decode_iv,
433 .set_rptr = iceland_ih_set_rptr
434};
435
436static void iceland_ih_set_interrupt_funcs(struct amdgpu_device *adev)
437{
438 adev->irq.ih_funcs = &iceland_ih_funcs;
439}
440
441const struct amdgpu_ip_block_version iceland_ih_ip_block =
442{
443 .type = AMD_IP_BLOCK_TYPE_IH,
444 .major = 2,
445 .minor = 4,
446 .rev = 0,
447 .funcs = &iceland_ih_ip_funcs,
448};
449

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