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
30#define IH_RING_SIZE (256 * 1024)
31#define IH_SW_RING_SIZE (16 * 1024) /* enough for 512 CAM entries */
32
33struct amdgpu_device;
34struct amdgpu_iv_entry;
35
36struct amdgpu_ih_regs {
37 uint32_t ih_rb_base;
38 uint32_t ih_rb_base_hi;
39 uint32_t ih_rb_cntl;
40 uint32_t ih_rb_wptr;
41 uint32_t ih_rb_rptr;
42 uint32_t ih_doorbell_rptr;
43 uint32_t ih_rb_wptr_addr_lo;
44 uint32_t ih_rb_wptr_addr_hi;
45 uint32_t psp_reg_id;
46};
47
48/*
49 * R6xx+ IH ring
50 */
51struct amdgpu_ih_ring {
52 unsigned ring_size;
53 uint32_t ptr_mask;
54 u32 doorbell_index;
55 bool use_doorbell;
56 bool use_bus_addr;
57
58 struct amdgpu_bo *ring_obj;
59 uint32_t *ring;
60 uint64_t gpu_addr;
61
62 uint64_t wptr_addr;
63 uint32_t *wptr_cpu;
64
65 uint64_t rptr_addr;
66 uint32_t *rptr_cpu;
67
68 bool enabled;
69 unsigned rptr;
70 struct amdgpu_ih_regs ih_regs;
71
72 /* For waiting on IH processing at checkpoint. */
73 wait_queue_head_t wait_process;
74 uint64_t processed_timestamp;
75 bool overflow;
76};
77
78/* return true if time stamp t2 is after t1 with 48bit wrap around */
79#define amdgpu_ih_ts_after(t1, t2) \
80 (((int64_t)((t2) << 16) - (int64_t)((t1) << 16)) > 0LL)
81
82#define amdgpu_ih_ts_after_or_equal(t1, t2) \
83 (((int64_t)((t2) << 16) - (int64_t)((t1) << 16)) >= 0LL)
84
85/* provided by the ih block */
86struct amdgpu_ih_funcs {
87 /* ring read/write ptr handling, called from interrupt context */
88 u32 (*get_wptr)(struct amdgpu_device *adev, struct amdgpu_ih_ring *ih);
89 void (*decode_iv)(struct amdgpu_device *adev, struct amdgpu_ih_ring *ih,
90 struct amdgpu_iv_entry *entry);
91 uint64_t (*decode_iv_ts)(struct amdgpu_ih_ring *ih, u32 rptr,
92 signed int offset);
93 void (*set_rptr)(struct amdgpu_device *adev, struct amdgpu_ih_ring *ih);
94};
95
96#define amdgpu_ih_get_wptr(adev, ih) (adev)->irq.ih_funcs->get_wptr((adev), (ih))
97#define amdgpu_ih_decode_iv(adev, iv) \
98 (adev)->irq.ih_funcs->decode_iv((adev), (ih), (iv))
99#define amdgpu_ih_decode_iv_ts(adev, ih, rptr, offset) \
100 (WARN_ON_ONCE(!(adev)->irq.ih_funcs->decode_iv_ts) ? 0 : \
101 (adev)->irq.ih_funcs->decode_iv_ts((ih), (rptr), (offset)))
102#define amdgpu_ih_set_rptr(adev, ih) (adev)->irq.ih_funcs->set_rptr((adev), (ih))
103
104int amdgpu_ih_ring_init(struct amdgpu_device *adev, struct amdgpu_ih_ring *ih,
105 unsigned ring_size, bool use_bus_addr);
106void amdgpu_ih_ring_fini(struct amdgpu_device *adev, struct amdgpu_ih_ring *ih);
107void amdgpu_ih_ring_write(struct amdgpu_device *adev, struct amdgpu_ih_ring *ih,
108 const uint32_t *iv, unsigned int num_dw);
109int amdgpu_ih_wait_on_checkpoint_process_ts(struct amdgpu_device *adev,
110 struct amdgpu_ih_ring *ih);
111int amdgpu_ih_process(struct amdgpu_device *adev, struct amdgpu_ih_ring *ih);
112void amdgpu_ih_decode_iv_helper(struct amdgpu_device *adev,
113 struct amdgpu_ih_ring *ih,
114 struct amdgpu_iv_entry *entry);
115uint64_t amdgpu_ih_decode_iv_ts_helper(struct amdgpu_ih_ring *ih, u32 rptr,
116 signed int offset);
117const char *amdgpu_ih_ring_name(struct amdgpu_device *adev, struct amdgpu_ih_ring *ih);
118#endif
119

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