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aaa36a97 AD |
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 | */ | |
47b757fb SR |
23 | |
24 | #include <linux/pci.h> | |
25 | ||
aaa36a97 AD |
26 | #include "amdgpu.h" |
27 | #include "amdgpu_ih.h" | |
28 | #include "vid.h" | |
29 | ||
30 | #include "oss/oss_3_0_1_d.h" | |
31 | #include "oss/oss_3_0_1_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 cz_ih_set_interrupt_funcs(struct amdgpu_device *adev); | |
52 | ||
53 | /** | |
54 | * cz_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 cz_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 | * cz_ih_disable_interrupts - Disable the interrupt ring buffer | |
74 | * | |
75 | * @adev: amdgpu_device pointer | |
76 | * | |
77 | * Disable the interrupt ring buffer (VI). | |
78 | */ | |
79 | static void cz_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 | * cz_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 | */ | |
106 | static int cz_ih_irq_init(struct amdgpu_device *adev) | |
107 | { | |
d81f78b4 | 108 | struct amdgpu_ih_ring *ih = &adev->irq.ih; |
aaa36a97 | 109 | u32 interrupt_cntl, ih_cntl, ih_rb_cntl; |
d81f78b4 | 110 | int rb_bufsz; |
aaa36a97 AD |
111 | |
112 | /* disable irqs */ | |
113 | cz_ih_disable_interrupts(adev); | |
114 | ||
115 | /* setup interrupt control */ | |
92e71b06 | 116 | WREG32(mmINTERRUPT_CNTL2, adev->dummy_page_addr >> 8); |
aaa36a97 AD |
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 */ | |
d81f78b4 CK |
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); | |
aaa36a97 AD |
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(adev->pdev); | |
156 | ||
157 | /* enable interrupts */ | |
158 | cz_ih_enable_interrupts(adev); | |
159 | ||
0e2b854e | 160 | return 0; |
aaa36a97 AD |
161 | } |
162 | ||
163 | /** | |
164 | * cz_ih_irq_disable - disable interrupts | |
165 | * | |
166 | * @adev: amdgpu_device pointer | |
167 | * | |
168 | * Disable interrupts on the hw (VI). | |
169 | */ | |
170 | static void cz_ih_irq_disable(struct amdgpu_device *adev) | |
171 | { | |
172 | cz_ih_disable_interrupts(adev); | |
173 | ||
174 | /* Wait and acknowledge irq */ | |
175 | mdelay(1); | |
176 | } | |
177 | ||
178 | /** | |
179 | * cz_ih_get_wptr - get the IH ring buffer wptr | |
180 | * | |
181 | * @adev: amdgpu_device pointer | |
a549a9da | 182 | * @ih: IH ring buffer to fetch wptr |
aaa36a97 AD |
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 | */ | |
8bb9eb48 CK |
190 | static u32 cz_ih_get_wptr(struct amdgpu_device *adev, |
191 | struct amdgpu_ih_ring *ih) | |
aaa36a97 AD |
192 | { |
193 | u32 wptr, tmp; | |
194 | ||
d81f78b4 | 195 | wptr = le32_to_cpu(*ih->wptr_cpu); |
aaa36a97 | 196 | |
e4180c42 DB |
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 | ||
208 | /* When a ring buffer overflow happen start parsing interrupt | |
209 | * from the last not overwritten vector (wptr + 16). Hopefully | |
210 | * this should allow us to catchup. | |
211 | */ | |
212 | dev_warn(adev->dev, "IH ring buffer overflow (0x%08X, 0x%08X, 0x%08X)\n", | |
213 | wptr, ih->rptr, (wptr + 16) & ih->ptr_mask); | |
214 | ih->rptr = (wptr + 16) & ih->ptr_mask; | |
215 | tmp = RREG32(mmIH_RB_CNTL); | |
216 | tmp = REG_SET_FIELD(tmp, IH_RB_CNTL, WPTR_OVERFLOW_CLEAR, 1); | |
217 | WREG32(mmIH_RB_CNTL, tmp); | |
218 | ||
9217b91c FV |
219 | /* Unset the CLEAR_OVERFLOW bit immediately so new overflows |
220 | * can be detected. | |
221 | */ | |
222 | tmp = REG_SET_FIELD(tmp, IH_RB_CNTL, WPTR_OVERFLOW_CLEAR, 0); | |
223 | WREG32(mmIH_RB_CNTL, tmp); | |
e4180c42 DB |
224 | |
225 | out: | |
8bb9eb48 | 226 | return (wptr & ih->ptr_mask); |
aaa36a97 AD |
227 | } |
228 | ||
229 | /** | |
230 | * cz_ih_decode_iv - decode an interrupt vector | |
231 | * | |
232 | * @adev: amdgpu_device pointer | |
a549a9da LJ |
233 | * @ih: IH ring buffer to decode |
234 | * @entry: IV entry to place decoded information into | |
aaa36a97 AD |
235 | * |
236 | * Decodes the interrupt vector at the current rptr | |
237 | * position and also advance the position. | |
238 | */ | |
239 | static void cz_ih_decode_iv(struct amdgpu_device *adev, | |
8bb9eb48 CK |
240 | struct amdgpu_ih_ring *ih, |
241 | struct amdgpu_iv_entry *entry) | |
aaa36a97 AD |
242 | { |
243 | /* wptr/rptr are in bytes! */ | |
8bb9eb48 | 244 | u32 ring_index = ih->rptr >> 2; |
aaa36a97 | 245 | uint32_t dw[4]; |
edf600da | 246 | |
8bb9eb48 CK |
247 | dw[0] = le32_to_cpu(ih->ring[ring_index + 0]); |
248 | dw[1] = le32_to_cpu(ih->ring[ring_index + 1]); | |
249 | dw[2] = le32_to_cpu(ih->ring[ring_index + 2]); | |
250 | dw[3] = le32_to_cpu(ih->ring[ring_index + 3]); | |
aaa36a97 | 251 | |
1ffdeca6 | 252 | entry->client_id = AMDGPU_IRQ_CLIENTID_LEGACY; |
aaa36a97 | 253 | entry->src_id = dw[0] & 0xff; |
7ccf5aa8 | 254 | entry->src_data[0] = dw[1] & 0xfffffff; |
aaa36a97 | 255 | entry->ring_id = dw[2] & 0xff; |
c4f46f22 | 256 | entry->vmid = (dw[2] >> 8) & 0xff; |
3816e42f | 257 | entry->pasid = (dw[2] >> 16) & 0xffff; |
aaa36a97 AD |
258 | |
259 | /* wptr/rptr are in bytes! */ | |
8bb9eb48 | 260 | ih->rptr += 16; |
aaa36a97 AD |
261 | } |
262 | ||
263 | /** | |
264 | * cz_ih_set_rptr - set the IH ring buffer rptr | |
265 | * | |
266 | * @adev: amdgpu_device pointer | |
a549a9da | 267 | * @ih: IH ring buffer to set rptr |
aaa36a97 AD |
268 | * |
269 | * Set the IH ring buffer rptr. | |
270 | */ | |
8bb9eb48 CK |
271 | static void cz_ih_set_rptr(struct amdgpu_device *adev, |
272 | struct amdgpu_ih_ring *ih) | |
aaa36a97 | 273 | { |
8bb9eb48 | 274 | WREG32(mmIH_RB_RPTR, ih->rptr); |
aaa36a97 AD |
275 | } |
276 | ||
5fc3aeeb | 277 | static int cz_ih_early_init(void *handle) |
aaa36a97 | 278 | { |
5fc3aeeb | 279 | struct amdgpu_device *adev = (struct amdgpu_device *)handle; |
5f232365 AD |
280 | int ret; |
281 | ||
282 | ret = amdgpu_irq_add_domain(adev); | |
283 | if (ret) | |
284 | return ret; | |
5fc3aeeb | 285 | |
aaa36a97 | 286 | cz_ih_set_interrupt_funcs(adev); |
5f232365 | 287 | |
aaa36a97 AD |
288 | return 0; |
289 | } | |
290 | ||
5fc3aeeb | 291 | static int cz_ih_sw_init(void *handle) |
aaa36a97 AD |
292 | { |
293 | int r; | |
5fc3aeeb | 294 | struct amdgpu_device *adev = (struct amdgpu_device *)handle; |
aaa36a97 | 295 | |
425c3143 | 296 | r = amdgpu_ih_ring_init(adev, &adev->irq.ih, 64 * 1024, false); |
aaa36a97 AD |
297 | if (r) |
298 | return r; | |
299 | ||
300 | r = amdgpu_irq_init(adev); | |
301 | ||
302 | return r; | |
303 | } | |
304 | ||
5fc3aeeb | 305 | static int cz_ih_sw_fini(void *handle) |
aaa36a97 | 306 | { |
5fc3aeeb | 307 | struct amdgpu_device *adev = (struct amdgpu_device *)handle; |
308 | ||
72c8c97b | 309 | amdgpu_irq_fini_sw(adev); |
5f232365 | 310 | amdgpu_irq_remove_domain(adev); |
aaa36a97 AD |
311 | |
312 | return 0; | |
313 | } | |
314 | ||
5fc3aeeb | 315 | static int cz_ih_hw_init(void *handle) |
aaa36a97 AD |
316 | { |
317 | int r; | |
5fc3aeeb | 318 | struct amdgpu_device *adev = (struct amdgpu_device *)handle; |
aaa36a97 AD |
319 | |
320 | r = cz_ih_irq_init(adev); | |
321 | if (r) | |
322 | return r; | |
323 | ||
324 | return 0; | |
325 | } | |
326 | ||
5fc3aeeb | 327 | static int cz_ih_hw_fini(void *handle) |
aaa36a97 | 328 | { |
5fc3aeeb | 329 | struct amdgpu_device *adev = (struct amdgpu_device *)handle; |
330 | ||
aaa36a97 AD |
331 | cz_ih_irq_disable(adev); |
332 | ||
333 | return 0; | |
334 | } | |
335 | ||
5fc3aeeb | 336 | static int cz_ih_suspend(void *handle) |
aaa36a97 | 337 | { |
5fc3aeeb | 338 | struct amdgpu_device *adev = (struct amdgpu_device *)handle; |
339 | ||
aaa36a97 AD |
340 | return cz_ih_hw_fini(adev); |
341 | } | |
342 | ||
5fc3aeeb | 343 | static int cz_ih_resume(void *handle) |
aaa36a97 | 344 | { |
5fc3aeeb | 345 | struct amdgpu_device *adev = (struct amdgpu_device *)handle; |
346 | ||
aaa36a97 AD |
347 | return cz_ih_hw_init(adev); |
348 | } | |
349 | ||
5fc3aeeb | 350 | static bool cz_ih_is_idle(void *handle) |
aaa36a97 | 351 | { |
5fc3aeeb | 352 | struct amdgpu_device *adev = (struct amdgpu_device *)handle; |
aaa36a97 AD |
353 | u32 tmp = RREG32(mmSRBM_STATUS); |
354 | ||
355 | if (REG_GET_FIELD(tmp, SRBM_STATUS, IH_BUSY)) | |
356 | return false; | |
357 | ||
358 | return true; | |
359 | } | |
360 | ||
5fc3aeeb | 361 | static int cz_ih_wait_for_idle(void *handle) |
aaa36a97 AD |
362 | { |
363 | unsigned i; | |
364 | u32 tmp; | |
5fc3aeeb | 365 | struct amdgpu_device *adev = (struct amdgpu_device *)handle; |
aaa36a97 AD |
366 | |
367 | for (i = 0; i < adev->usec_timeout; i++) { | |
368 | /* read MC_STATUS */ | |
369 | tmp = RREG32(mmSRBM_STATUS); | |
370 | if (!REG_GET_FIELD(tmp, SRBM_STATUS, IH_BUSY)) | |
371 | return 0; | |
372 | udelay(1); | |
373 | } | |
374 | return -ETIMEDOUT; | |
375 | } | |
376 | ||
5fc3aeeb | 377 | static int cz_ih_soft_reset(void *handle) |
aaa36a97 AD |
378 | { |
379 | u32 srbm_soft_reset = 0; | |
5fc3aeeb | 380 | struct amdgpu_device *adev = (struct amdgpu_device *)handle; |
aaa36a97 AD |
381 | u32 tmp = RREG32(mmSRBM_STATUS); |
382 | ||
383 | if (tmp & SRBM_STATUS__IH_BUSY_MASK) | |
384 | srbm_soft_reset = REG_SET_FIELD(srbm_soft_reset, SRBM_SOFT_RESET, | |
385 | SOFT_RESET_IH, 1); | |
386 | ||
387 | if (srbm_soft_reset) { | |
aaa36a97 AD |
388 | tmp = RREG32(mmSRBM_SOFT_RESET); |
389 | tmp |= srbm_soft_reset; | |
390 | dev_info(adev->dev, "SRBM_SOFT_RESET=0x%08X\n", tmp); | |
391 | WREG32(mmSRBM_SOFT_RESET, tmp); | |
392 | tmp = RREG32(mmSRBM_SOFT_RESET); | |
393 | ||
394 | udelay(50); | |
395 | ||
396 | tmp &= ~srbm_soft_reset; | |
397 | WREG32(mmSRBM_SOFT_RESET, tmp); | |
398 | tmp = RREG32(mmSRBM_SOFT_RESET); | |
399 | ||
400 | /* Wait a little for things to settle down */ | |
401 | udelay(50); | |
aaa36a97 AD |
402 | } |
403 | ||
404 | return 0; | |
405 | } | |
406 | ||
5fc3aeeb | 407 | static int cz_ih_set_clockgating_state(void *handle, |
408 | enum amd_clockgating_state state) | |
aaa36a97 AD |
409 | { |
410 | // TODO | |
411 | return 0; | |
412 | } | |
413 | ||
5fc3aeeb | 414 | static int cz_ih_set_powergating_state(void *handle, |
415 | enum amd_powergating_state state) | |
aaa36a97 AD |
416 | { |
417 | // TODO | |
418 | return 0; | |
419 | } | |
420 | ||
a1255107 | 421 | static const struct amd_ip_funcs cz_ih_ip_funcs = { |
88a907d6 | 422 | .name = "cz_ih", |
aaa36a97 AD |
423 | .early_init = cz_ih_early_init, |
424 | .late_init = NULL, | |
425 | .sw_init = cz_ih_sw_init, | |
426 | .sw_fini = cz_ih_sw_fini, | |
427 | .hw_init = cz_ih_hw_init, | |
428 | .hw_fini = cz_ih_hw_fini, | |
429 | .suspend = cz_ih_suspend, | |
430 | .resume = cz_ih_resume, | |
431 | .is_idle = cz_ih_is_idle, | |
432 | .wait_for_idle = cz_ih_wait_for_idle, | |
433 | .soft_reset = cz_ih_soft_reset, | |
aaa36a97 AD |
434 | .set_clockgating_state = cz_ih_set_clockgating_state, |
435 | .set_powergating_state = cz_ih_set_powergating_state, | |
436 | }; | |
437 | ||
438 | static const struct amdgpu_ih_funcs cz_ih_funcs = { | |
439 | .get_wptr = cz_ih_get_wptr, | |
440 | .decode_iv = cz_ih_decode_iv, | |
441 | .set_rptr = cz_ih_set_rptr | |
442 | }; | |
443 | ||
444 | static void cz_ih_set_interrupt_funcs(struct amdgpu_device *adev) | |
445 | { | |
f54b30d7 | 446 | adev->irq.ih_funcs = &cz_ih_funcs; |
aaa36a97 AD |
447 | } |
448 | ||
a1255107 AD |
449 | const struct amdgpu_ip_block_version cz_ih_ip_block = |
450 | { | |
451 | .type = AMD_IP_BLOCK_TYPE_IH, | |
452 | .major = 3, | |
453 | .minor = 0, | |
454 | .rev = 0, | |
455 | .funcs = &cz_ih_ip_funcs, | |
456 | }; |