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#ifndef __AMDGPU_IH_H__
25#define __AMDGPU_IH_H__
26
27/* Maximum number of IVs processed at once */
28#define AMDGPU_IH_MAX_NUM_IVS 32
29
30struct amdgpu_device;
31struct amdgpu_iv_entry;
32
33struct amdgpu_ih_regs {
34 uint32_t ih_rb_base;
35 uint32_t ih_rb_base_hi;
36 uint32_t ih_rb_cntl;
37 uint32_t ih_rb_wptr;
38 uint32_t ih_rb_rptr;
39 uint32_t ih_doorbell_rptr;
40 uint32_t ih_rb_wptr_addr_lo;
41 uint32_t ih_rb_wptr_addr_hi;
42 uint32_t psp_reg_id;
43};
44
45/*
46 * R6xx+ IH ring
47 */
48struct amdgpu_ih_ring {
49 unsigned ring_size;
50 uint32_t ptr_mask;
51 u32 doorbell_index;
52 bool use_doorbell;
53 bool use_bus_addr;
54
55 struct amdgpu_bo *ring_obj;
56 volatile uint32_t *ring;
57 uint64_t gpu_addr;
58
59 uint64_t wptr_addr;
60 volatile uint32_t *wptr_cpu;
61
62 uint64_t rptr_addr;
63 volatile uint32_t *rptr_cpu;
64
65 bool enabled;
66 unsigned rptr;
67 struct amdgpu_ih_regs ih_regs;
68
69 /* For waiting on IH processing at checkpoint. */
70 wait_queue_head_t wait_process;
71 uint64_t processed_timestamp;
72};
73
74/* return true if time stamp t2 is after t1 with 48bit wrap around */
75#define amdgpu_ih_ts_after(t1, t2) \
76 (((int64_t)((t2) << 16) - (int64_t)((t1) << 16)) > 0LL)
77
78/* provided by the ih block */
79struct amdgpu_ih_funcs {
80 /* ring read/write ptr handling, called from interrupt context */
81 u32 (*get_wptr)(struct amdgpu_device *adev, struct amdgpu_ih_ring *ih);
82 void (*decode_iv)(struct amdgpu_device *adev, struct amdgpu_ih_ring *ih,
83 struct amdgpu_iv_entry *entry);
84 uint64_t (*decode_iv_ts)(struct amdgpu_ih_ring *ih, u32 rptr,
85 signed int offset);
86 void (*set_rptr)(struct amdgpu_device *adev, struct amdgpu_ih_ring *ih);
87};
88
89#define amdgpu_ih_get_wptr(adev, ih) (adev)->irq.ih_funcs->get_wptr((adev), (ih))
90#define amdgpu_ih_decode_iv(adev, iv) \
91 (adev)->irq.ih_funcs->decode_iv((adev), (ih), (iv))
92#define amdgpu_ih_decode_iv_ts(adev, ih, rptr, offset) \
93 (WARN_ON_ONCE(!(adev)->irq.ih_funcs->decode_iv_ts) ? 0 : \
94 (adev)->irq.ih_funcs->decode_iv_ts((ih), (rptr), (offset)))
95#define amdgpu_ih_set_rptr(adev, ih) (adev)->irq.ih_funcs->set_rptr((adev), (ih))
96
97int amdgpu_ih_ring_init(struct amdgpu_device *adev, struct amdgpu_ih_ring *ih,
98 unsigned ring_size, bool use_bus_addr);
99void amdgpu_ih_ring_fini(struct amdgpu_device *adev, struct amdgpu_ih_ring *ih);
100void amdgpu_ih_ring_write(struct amdgpu_ih_ring *ih, const uint32_t *iv,
101 unsigned int num_dw);
102int amdgpu_ih_wait_on_checkpoint_process_ts(struct amdgpu_device *adev,
103 struct amdgpu_ih_ring *ih);
104int amdgpu_ih_process(struct amdgpu_device *adev, struct amdgpu_ih_ring *ih);
105void amdgpu_ih_decode_iv_helper(struct amdgpu_device *adev,
106 struct amdgpu_ih_ring *ih,
107 struct amdgpu_iv_entry *entry);
108uint64_t amdgpu_ih_decode_iv_ts_helper(struct amdgpu_ih_ring *ih, u32 rptr,
109 signed int offset);
110#endif
111

source code of linux/drivers/gpu/drm/amd/amdgpu/amdgpu_ih.h