2 * Copyright 2014 Advanced Micro Devices, Inc.
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:
11 * The above copyright notice and this permission notice shall be included in
12 * all copies or substantial portions of the Software.
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.
24 #include <linux/pci.h>
27 #include "amdgpu_ih.h"
30 #include "oss/oss_2_4_d.h"
31 #include "oss/oss_2_4_sh_mask.h"
33 #include "bif/bif_5_1_d.h"
34 #include "bif/bif_5_1_sh_mask.h"
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.
51 static void iceland_ih_set_interrupt_funcs(struct amdgpu_device *adev);
54 * iceland_ih_enable_interrupts - Enable the interrupt ring buffer
56 * @adev: amdgpu_device pointer
58 * Enable the interrupt ring buffer (VI).
60 static void iceland_ih_enable_interrupts(struct amdgpu_device *adev)
62 u32 ih_cntl = RREG32(mmIH_CNTL);
63 u32 ih_rb_cntl = RREG32(mmIH_RB_CNTL);
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;
73 * iceland_ih_disable_interrupts - Disable the interrupt ring buffer
75 * @adev: amdgpu_device pointer
77 * Disable the interrupt ring buffer (VI).
79 static void iceland_ih_disable_interrupts(struct amdgpu_device *adev)
81 u32 ih_rb_cntl = RREG32(mmIH_RB_CNTL);
82 u32 ih_cntl = RREG32(mmIH_CNTL);
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;
96 * iceland_ih_irq_init - init and enable the interrupt ring
98 * @adev: amdgpu_device pointer
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.
106 static int iceland_ih_irq_init(struct amdgpu_device *adev)
108 struct amdgpu_ih_ring *ih = &adev->irq.ih;
110 u32 interrupt_cntl, ih_cntl, ih_rb_cntl;
113 iceland_ih_disable_interrupts(adev);
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
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);
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);
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);
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);
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);
141 WREG32(mmIH_RB_CNTL, ih_rb_cntl);
143 /* set rptr, wptr to 0 */
144 WREG32(mmIH_RB_RPTR, 0);
145 WREG32(mmIH_RB_WPTR, 0);
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);
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);
155 pci_set_master(adev->pdev);
157 /* enable interrupts */
158 iceland_ih_enable_interrupts(adev);
164 * iceland_ih_irq_disable - disable interrupts
166 * @adev: amdgpu_device pointer
168 * Disable interrupts on the hw (VI).
170 static void iceland_ih_irq_disable(struct amdgpu_device *adev)
172 iceland_ih_disable_interrupts(adev);
174 /* Wait and acknowledge irq */
179 * iceland_ih_get_wptr - get the IH ring buffer wptr
181 * @adev: amdgpu_device pointer
182 * @ih: IH ring buffer to fetch wptr
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.
190 static u32 iceland_ih_get_wptr(struct amdgpu_device *adev,
191 struct amdgpu_ih_ring *ih)
195 wptr = le32_to_cpu(*ih->wptr_cpu);
197 if (!REG_GET_FIELD(wptr, IH_RB_WPTR, RB_OVERFLOW))
200 /* Double check that the overflow wasn't already cleared. */
201 wptr = RREG32(mmIH_RB_WPTR);
203 if (!REG_GET_FIELD(wptr, IH_RB_WPTR, RB_OVERFLOW))
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.
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);
218 /* Unset the CLEAR_OVERFLOW bit immediately so new overflows
221 tmp = REG_SET_FIELD(tmp, IH_RB_CNTL, WPTR_OVERFLOW_CLEAR, 0);
222 WREG32(mmIH_RB_CNTL, tmp);
225 return (wptr & ih->ptr_mask);
229 * iceland_ih_decode_iv - decode an interrupt vector
231 * @adev: amdgpu_device pointer
232 * @ih: IH ring buffer to decode
233 * @entry: IV entry to place decoded information into
235 * Decodes the interrupt vector at the current rptr
236 * position and also advance the position.
238 static void iceland_ih_decode_iv(struct amdgpu_device *adev,
239 struct amdgpu_ih_ring *ih,
240 struct amdgpu_iv_entry *entry)
242 /* wptr/rptr are in bytes! */
243 u32 ring_index = ih->rptr >> 2;
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]);
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;
258 /* wptr/rptr are in bytes! */
263 * iceland_ih_set_rptr - set the IH ring buffer rptr
265 * @adev: amdgpu_device pointer
266 * @ih: IH ring buffer to set rptr
268 * Set the IH ring buffer rptr.
270 static void iceland_ih_set_rptr(struct amdgpu_device *adev,
271 struct amdgpu_ih_ring *ih)
273 WREG32(mmIH_RB_RPTR, ih->rptr);
276 static int iceland_ih_early_init(struct amdgpu_ip_block *ip_block)
278 struct amdgpu_device *adev = ip_block->adev;
281 ret = amdgpu_irq_add_domain(adev);
285 iceland_ih_set_interrupt_funcs(adev);
290 static int iceland_ih_sw_init(struct amdgpu_ip_block *ip_block)
293 struct amdgpu_device *adev = ip_block->adev;
295 r = amdgpu_ih_ring_init(adev, &adev->irq.ih, 64 * 1024, false);
299 r = amdgpu_irq_init(adev);
304 static int iceland_ih_sw_fini(struct amdgpu_ip_block *ip_block)
306 struct amdgpu_device *adev = ip_block->adev;
308 amdgpu_irq_fini_sw(adev);
309 amdgpu_irq_remove_domain(adev);
314 static int iceland_ih_hw_init(struct amdgpu_ip_block *ip_block)
316 struct amdgpu_device *adev = ip_block->adev;
318 return iceland_ih_irq_init(adev);
321 static int iceland_ih_hw_fini(struct amdgpu_ip_block *ip_block)
323 iceland_ih_irq_disable(ip_block->adev);
328 static int iceland_ih_suspend(struct amdgpu_ip_block *ip_block)
330 return iceland_ih_hw_fini(ip_block);
333 static int iceland_ih_resume(struct amdgpu_ip_block *ip_block)
335 return iceland_ih_hw_init(ip_block);
338 static bool iceland_ih_is_idle(void *handle)
340 struct amdgpu_device *adev = (struct amdgpu_device *)handle;
341 u32 tmp = RREG32(mmSRBM_STATUS);
343 if (REG_GET_FIELD(tmp, SRBM_STATUS, IH_BUSY))
349 static int iceland_ih_wait_for_idle(struct amdgpu_ip_block *ip_block)
353 struct amdgpu_device *adev = ip_block->adev;
355 for (i = 0; i < adev->usec_timeout; i++) {
357 tmp = RREG32(mmSRBM_STATUS);
358 if (!REG_GET_FIELD(tmp, SRBM_STATUS, IH_BUSY))
365 static int iceland_ih_soft_reset(struct amdgpu_ip_block *ip_block)
367 u32 srbm_soft_reset = 0;
368 struct amdgpu_device *adev = ip_block->adev;
369 u32 tmp = RREG32(mmSRBM_STATUS);
371 if (tmp & SRBM_STATUS__IH_BUSY_MASK)
372 srbm_soft_reset = REG_SET_FIELD(srbm_soft_reset, SRBM_SOFT_RESET,
375 if (srbm_soft_reset) {
376 tmp = RREG32(mmSRBM_SOFT_RESET);
377 tmp |= srbm_soft_reset;
378 dev_info(adev->dev, "SRBM_SOFT_RESET=0x%08X\n", tmp);
379 WREG32(mmSRBM_SOFT_RESET, tmp);
380 tmp = RREG32(mmSRBM_SOFT_RESET);
384 tmp &= ~srbm_soft_reset;
385 WREG32(mmSRBM_SOFT_RESET, tmp);
386 tmp = RREG32(mmSRBM_SOFT_RESET);
388 /* Wait a little for things to settle down */
395 static int iceland_ih_set_clockgating_state(struct amdgpu_ip_block *ip_block,
396 enum amd_clockgating_state state)
401 static int iceland_ih_set_powergating_state(struct amdgpu_ip_block *ip_block,
402 enum amd_powergating_state state)
407 static const struct amd_ip_funcs iceland_ih_ip_funcs = {
408 .name = "iceland_ih",
409 .early_init = iceland_ih_early_init,
410 .sw_init = iceland_ih_sw_init,
411 .sw_fini = iceland_ih_sw_fini,
412 .hw_init = iceland_ih_hw_init,
413 .hw_fini = iceland_ih_hw_fini,
414 .suspend = iceland_ih_suspend,
415 .resume = iceland_ih_resume,
416 .is_idle = iceland_ih_is_idle,
417 .wait_for_idle = iceland_ih_wait_for_idle,
418 .soft_reset = iceland_ih_soft_reset,
419 .set_clockgating_state = iceland_ih_set_clockgating_state,
420 .set_powergating_state = iceland_ih_set_powergating_state,
423 static const struct amdgpu_ih_funcs iceland_ih_funcs = {
424 .get_wptr = iceland_ih_get_wptr,
425 .decode_iv = iceland_ih_decode_iv,
426 .set_rptr = iceland_ih_set_rptr
429 static void iceland_ih_set_interrupt_funcs(struct amdgpu_device *adev)
431 adev->irq.ih_funcs = &iceland_ih_funcs;
434 const struct amdgpu_ip_block_version iceland_ih_ip_block =
436 .type = AMD_IP_BLOCK_TYPE_IH,
440 .funcs = &iceland_ih_ip_funcs,