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.
25 #include "amdgpu_ih.h"
28 #include "oss/oss_2_4_d.h"
29 #include "oss/oss_2_4_sh_mask.h"
31 #include "bif/bif_5_1_d.h"
32 #include "bif/bif_5_1_sh_mask.h"
36 * Starting with r6xx, interrupts are handled via a ring buffer.
37 * Ring buffers are areas of GPU accessible memory that the GPU
38 * writes interrupt vectors into and the host reads vectors out of.
39 * There is a rptr (read pointer) that determines where the
40 * host is currently reading, and a wptr (write pointer)
41 * which determines where the GPU has written. When the
42 * pointers are equal, the ring is idle. When the GPU
43 * writes vectors to the ring buffer, it increments the
44 * wptr. When there is an interrupt, the host then starts
45 * fetching commands and processing them until the pointers are
46 * equal again at which point it updates the rptr.
49 static void iceland_ih_set_interrupt_funcs(struct amdgpu_device
*adev
);
52 * iceland_ih_enable_interrupts - Enable the interrupt ring buffer
54 * @adev: amdgpu_device pointer
56 * Enable the interrupt ring buffer (VI).
58 static void iceland_ih_enable_interrupts(struct amdgpu_device
*adev
)
60 u32 ih_cntl
= RREG32(mmIH_CNTL
);
61 u32 ih_rb_cntl
= RREG32(mmIH_RB_CNTL
);
63 ih_cntl
= REG_SET_FIELD(ih_cntl
, IH_CNTL
, ENABLE_INTR
, 1);
64 ih_rb_cntl
= REG_SET_FIELD(ih_rb_cntl
, IH_RB_CNTL
, RB_ENABLE
, 1);
65 WREG32(mmIH_CNTL
, ih_cntl
);
66 WREG32(mmIH_RB_CNTL
, ih_rb_cntl
);
67 adev
->irq
.ih
.enabled
= true;
71 * iceland_ih_disable_interrupts - Disable the interrupt ring buffer
73 * @adev: amdgpu_device pointer
75 * Disable the interrupt ring buffer (VI).
77 static void iceland_ih_disable_interrupts(struct amdgpu_device
*adev
)
79 u32 ih_rb_cntl
= RREG32(mmIH_RB_CNTL
);
80 u32 ih_cntl
= RREG32(mmIH_CNTL
);
82 ih_rb_cntl
= REG_SET_FIELD(ih_rb_cntl
, IH_RB_CNTL
, RB_ENABLE
, 0);
83 ih_cntl
= REG_SET_FIELD(ih_cntl
, IH_CNTL
, ENABLE_INTR
, 0);
84 WREG32(mmIH_RB_CNTL
, ih_rb_cntl
);
85 WREG32(mmIH_CNTL
, ih_cntl
);
86 /* set rptr, wptr to 0 */
87 WREG32(mmIH_RB_RPTR
, 0);
88 WREG32(mmIH_RB_WPTR
, 0);
89 adev
->irq
.ih
.enabled
= false;
90 adev
->irq
.ih
.rptr
= 0;
94 * iceland_ih_irq_init - init and enable the interrupt ring
96 * @adev: amdgpu_device pointer
98 * Allocate a ring buffer for the interrupt controller,
99 * enable the RLC, disable interrupts, enable the IH
100 * ring buffer and enable it (VI).
101 * Called at device load and reume.
102 * Returns 0 for success, errors for failure.
104 static int iceland_ih_irq_init(struct amdgpu_device
*adev
)
107 u32 interrupt_cntl
, ih_cntl
, ih_rb_cntl
;
111 iceland_ih_disable_interrupts(adev
);
113 /* setup interrupt control */
114 WREG32(mmINTERRUPT_CNTL2
, adev
->dummy_page
.addr
>> 8);
115 interrupt_cntl
= RREG32(mmINTERRUPT_CNTL
);
116 /* INTERRUPT_CNTL__IH_DUMMY_RD_OVERRIDE_MASK=0 - dummy read disabled with msi, enabled without msi
117 * INTERRUPT_CNTL__IH_DUMMY_RD_OVERRIDE_MASK=1 - dummy read controlled by IH_DUMMY_RD_EN
119 interrupt_cntl
= REG_SET_FIELD(interrupt_cntl
, INTERRUPT_CNTL
, IH_DUMMY_RD_OVERRIDE
, 0);
120 /* INTERRUPT_CNTL__IH_REQ_NONSNOOP_EN_MASK=1 if ring is in non-cacheable memory, e.g., vram */
121 interrupt_cntl
= REG_SET_FIELD(interrupt_cntl
, INTERRUPT_CNTL
, IH_REQ_NONSNOOP_EN
, 0);
122 WREG32(mmINTERRUPT_CNTL
, interrupt_cntl
);
124 /* Ring Buffer base. [39:8] of 40-bit address of the beginning of the ring buffer*/
125 WREG32(mmIH_RB_BASE
, adev
->irq
.ih
.gpu_addr
>> 8);
127 rb_bufsz
= order_base_2(adev
->irq
.ih
.ring_size
/ 4);
128 ih_rb_cntl
= REG_SET_FIELD(0, IH_RB_CNTL
, WPTR_OVERFLOW_ENABLE
, 1);
129 ih_rb_cntl
= REG_SET_FIELD(ih_rb_cntl
, IH_RB_CNTL
, WPTR_OVERFLOW_CLEAR
, 1);
130 ih_rb_cntl
= REG_SET_FIELD(ih_rb_cntl
, IH_RB_CNTL
, RB_SIZE
, rb_bufsz
);
132 /* Ring Buffer write pointer writeback. If enabled, IH_RB_WPTR register value is written to memory */
133 ih_rb_cntl
= REG_SET_FIELD(ih_rb_cntl
, IH_RB_CNTL
, WPTR_WRITEBACK_ENABLE
, 1);
135 /* set the writeback address whether it's enabled or not */
136 wptr_off
= adev
->wb
.gpu_addr
+ (adev
->irq
.ih
.wptr_offs
* 4);
137 WREG32(mmIH_RB_WPTR_ADDR_LO
, lower_32_bits(wptr_off
));
138 WREG32(mmIH_RB_WPTR_ADDR_HI
, upper_32_bits(wptr_off
) & 0xFF);
140 WREG32(mmIH_RB_CNTL
, ih_rb_cntl
);
142 /* set rptr, wptr to 0 */
143 WREG32(mmIH_RB_RPTR
, 0);
144 WREG32(mmIH_RB_WPTR
, 0);
146 /* Default settings for IH_CNTL (disabled at first) */
147 ih_cntl
= RREG32(mmIH_CNTL
);
148 ih_cntl
= REG_SET_FIELD(ih_cntl
, IH_CNTL
, MC_VMID
, 0);
150 if (adev
->irq
.msi_enabled
)
151 ih_cntl
= REG_SET_FIELD(ih_cntl
, IH_CNTL
, RPTR_REARM
, 1);
152 WREG32(mmIH_CNTL
, ih_cntl
);
154 pci_set_master(adev
->pdev
);
156 /* enable interrupts */
157 iceland_ih_enable_interrupts(adev
);
163 * iceland_ih_irq_disable - disable interrupts
165 * @adev: amdgpu_device pointer
167 * Disable interrupts on the hw (VI).
169 static void iceland_ih_irq_disable(struct amdgpu_device
*adev
)
171 iceland_ih_disable_interrupts(adev
);
173 /* Wait and acknowledge irq */
178 * iceland_ih_get_wptr - get the IH ring buffer wptr
180 * @adev: amdgpu_device pointer
182 * Get the IH ring buffer wptr from either the register
183 * or the writeback memory buffer (VI). Also check for
184 * ring buffer overflow and deal with it.
185 * Used by cz_irq_process(VI).
186 * Returns the value of the wptr.
188 static u32
iceland_ih_get_wptr(struct amdgpu_device
*adev
)
192 wptr
= le32_to_cpu(adev
->wb
.wb
[adev
->irq
.ih
.wptr_offs
]);
194 if (REG_GET_FIELD(wptr
, IH_RB_WPTR
, RB_OVERFLOW
)) {
195 wptr
= REG_SET_FIELD(wptr
, IH_RB_WPTR
, RB_OVERFLOW
, 0);
196 /* When a ring buffer overflow happen start parsing interrupt
197 * from the last not overwritten vector (wptr + 16). Hopefully
198 * this should allow us to catchup.
200 dev_warn(adev
->dev
, "IH ring buffer overflow (0x%08X, 0x%08X, 0x%08X)\n",
201 wptr
, adev
->irq
.ih
.rptr
, (wptr
+ 16) & adev
->irq
.ih
.ptr_mask
);
202 adev
->irq
.ih
.rptr
= (wptr
+ 16) & adev
->irq
.ih
.ptr_mask
;
203 tmp
= RREG32(mmIH_RB_CNTL
);
204 tmp
= REG_SET_FIELD(tmp
, IH_RB_CNTL
, WPTR_OVERFLOW_CLEAR
, 1);
205 WREG32(mmIH_RB_CNTL
, tmp
);
207 return (wptr
& adev
->irq
.ih
.ptr_mask
);
211 * iceland_ih_decode_iv - decode an interrupt vector
213 * @adev: amdgpu_device pointer
215 * Decodes the interrupt vector at the current rptr
216 * position and also advance the position.
218 static void iceland_ih_decode_iv(struct amdgpu_device
*adev
,
219 struct amdgpu_iv_entry
*entry
)
221 /* wptr/rptr are in bytes! */
222 u32 ring_index
= adev
->irq
.ih
.rptr
>> 2;
225 dw
[0] = le32_to_cpu(adev
->irq
.ih
.ring
[ring_index
+ 0]);
226 dw
[1] = le32_to_cpu(adev
->irq
.ih
.ring
[ring_index
+ 1]);
227 dw
[2] = le32_to_cpu(adev
->irq
.ih
.ring
[ring_index
+ 2]);
228 dw
[3] = le32_to_cpu(adev
->irq
.ih
.ring
[ring_index
+ 3]);
230 entry
->src_id
= dw
[0] & 0xff;
231 entry
->src_data
= dw
[1] & 0xfffffff;
232 entry
->ring_id
= dw
[2] & 0xff;
233 entry
->vm_id
= (dw
[2] >> 8) & 0xff;
234 entry
->pas_id
= (dw
[2] >> 16) & 0xffff;
236 /* wptr/rptr are in bytes! */
237 adev
->irq
.ih
.rptr
+= 16;
241 * iceland_ih_set_rptr - set the IH ring buffer rptr
243 * @adev: amdgpu_device pointer
245 * Set the IH ring buffer rptr.
247 static void iceland_ih_set_rptr(struct amdgpu_device
*adev
)
249 WREG32(mmIH_RB_RPTR
, adev
->irq
.ih
.rptr
);
252 static int iceland_ih_early_init(void *handle
)
254 struct amdgpu_device
*adev
= (struct amdgpu_device
*)handle
;
257 ret
= amdgpu_irq_add_domain(adev
);
261 iceland_ih_set_interrupt_funcs(adev
);
266 static int iceland_ih_sw_init(void *handle
)
269 struct amdgpu_device
*adev
= (struct amdgpu_device
*)handle
;
271 r
= amdgpu_ih_ring_init(adev
, 64 * 1024, false);
275 r
= amdgpu_irq_init(adev
);
280 static int iceland_ih_sw_fini(void *handle
)
282 struct amdgpu_device
*adev
= (struct amdgpu_device
*)handle
;
284 amdgpu_irq_fini(adev
);
285 amdgpu_ih_ring_fini(adev
);
286 amdgpu_irq_remove_domain(adev
);
291 static int iceland_ih_hw_init(void *handle
)
294 struct amdgpu_device
*adev
= (struct amdgpu_device
*)handle
;
296 r
= iceland_ih_irq_init(adev
);
303 static int iceland_ih_hw_fini(void *handle
)
305 struct amdgpu_device
*adev
= (struct amdgpu_device
*)handle
;
307 iceland_ih_irq_disable(adev
);
312 static int iceland_ih_suspend(void *handle
)
314 struct amdgpu_device
*adev
= (struct amdgpu_device
*)handle
;
316 return iceland_ih_hw_fini(adev
);
319 static int iceland_ih_resume(void *handle
)
321 struct amdgpu_device
*adev
= (struct amdgpu_device
*)handle
;
323 return iceland_ih_hw_init(adev
);
326 static bool iceland_ih_is_idle(void *handle
)
328 struct amdgpu_device
*adev
= (struct amdgpu_device
*)handle
;
329 u32 tmp
= RREG32(mmSRBM_STATUS
);
331 if (REG_GET_FIELD(tmp
, SRBM_STATUS
, IH_BUSY
))
337 static int iceland_ih_wait_for_idle(void *handle
)
341 struct amdgpu_device
*adev
= (struct amdgpu_device
*)handle
;
343 for (i
= 0; i
< adev
->usec_timeout
; i
++) {
345 tmp
= RREG32(mmSRBM_STATUS
);
346 if (!REG_GET_FIELD(tmp
, SRBM_STATUS
, IH_BUSY
))
353 static int iceland_ih_soft_reset(void *handle
)
355 u32 srbm_soft_reset
= 0;
356 struct amdgpu_device
*adev
= (struct amdgpu_device
*)handle
;
357 u32 tmp
= RREG32(mmSRBM_STATUS
);
359 if (tmp
& SRBM_STATUS__IH_BUSY_MASK
)
360 srbm_soft_reset
= REG_SET_FIELD(srbm_soft_reset
, SRBM_SOFT_RESET
,
363 if (srbm_soft_reset
) {
364 tmp
= RREG32(mmSRBM_SOFT_RESET
);
365 tmp
|= srbm_soft_reset
;
366 dev_info(adev
->dev
, "SRBM_SOFT_RESET=0x%08X\n", tmp
);
367 WREG32(mmSRBM_SOFT_RESET
, tmp
);
368 tmp
= RREG32(mmSRBM_SOFT_RESET
);
372 tmp
&= ~srbm_soft_reset
;
373 WREG32(mmSRBM_SOFT_RESET
, tmp
);
374 tmp
= RREG32(mmSRBM_SOFT_RESET
);
376 /* Wait a little for things to settle down */
383 static int iceland_ih_set_clockgating_state(void *handle
,
384 enum amd_clockgating_state state
)
389 static int iceland_ih_set_powergating_state(void *handle
,
390 enum amd_powergating_state state
)
395 static const struct amd_ip_funcs iceland_ih_ip_funcs
= {
396 .name
= "iceland_ih",
397 .early_init
= iceland_ih_early_init
,
399 .sw_init
= iceland_ih_sw_init
,
400 .sw_fini
= iceland_ih_sw_fini
,
401 .hw_init
= iceland_ih_hw_init
,
402 .hw_fini
= iceland_ih_hw_fini
,
403 .suspend
= iceland_ih_suspend
,
404 .resume
= iceland_ih_resume
,
405 .is_idle
= iceland_ih_is_idle
,
406 .wait_for_idle
= iceland_ih_wait_for_idle
,
407 .soft_reset
= iceland_ih_soft_reset
,
408 .set_clockgating_state
= iceland_ih_set_clockgating_state
,
409 .set_powergating_state
= iceland_ih_set_powergating_state
,
412 static const struct amdgpu_ih_funcs iceland_ih_funcs
= {
413 .get_wptr
= iceland_ih_get_wptr
,
414 .decode_iv
= iceland_ih_decode_iv
,
415 .set_rptr
= iceland_ih_set_rptr
418 static void iceland_ih_set_interrupt_funcs(struct amdgpu_device
*adev
)
420 if (adev
->irq
.ih_funcs
== NULL
)
421 adev
->irq
.ih_funcs
= &iceland_ih_funcs
;
424 const struct amdgpu_ip_block_version iceland_ih_ip_block
=
426 .type
= AMD_IP_BLOCK_TYPE_IH
,
430 .funcs
= &iceland_ih_ip_funcs
,