File: | dev/pci/drm/amd/amdgpu/amdgpu_fru_eeprom.c |
Warning: | line 41, column 23 Value stored to 'atom_ctx' during its initialization is never read |
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1 | /* |
2 | * Copyright 2019 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 | #include <linux/pci.h> |
24 | |
25 | #include "amdgpu.h" |
26 | #include "amdgpu_i2c.h" |
27 | #include "smu_v11_0_i2c.h" |
28 | #include "atom.h" |
29 | #include "amdgpu_fru_eeprom.h" |
30 | |
31 | #define I2C_PRODUCT_INFO_ADDR0xAC 0xAC |
32 | #define I2C_PRODUCT_INFO_ADDR_SIZE0x2 0x2 |
33 | #define I2C_PRODUCT_INFO_OFFSET0xC0 0xC0 |
34 | |
35 | static bool_Bool is_fru_eeprom_supported(struct amdgpu_device *adev) |
36 | { |
37 | /* Only server cards have the FRU EEPROM |
38 | * TODO: See if we can figure this out dynamically instead of |
39 | * having to parse VBIOS versions. |
40 | */ |
41 | struct atom_context *atom_ctx = adev->mode_info.atom_context; |
Value stored to 'atom_ctx' during its initialization is never read | |
42 | |
43 | /* VBIOS is of the format ###-DXXXYY-##. For SKU identification, |
44 | * we can use just the "DXXX" portion. If there were more models, we |
45 | * could convert the 3 characters to a hex integer and use a switch |
46 | * for ease/speed/readability. For now, 2 string comparisons are |
47 | * reasonable and not too expensive |
48 | */ |
49 | switch (adev->asic_type) { |
50 | case CHIP_VEGA20: |
51 | #ifdef notyet |
52 | /* D161 and D163 are the VG20 server SKUs */ |
53 | if (strnstr(atom_ctx->vbios_version, "D161", |
54 | sizeof(atom_ctx->vbios_version)) || |
55 | strnstr(atom_ctx->vbios_version, "D163", |
56 | sizeof(atom_ctx->vbios_version))) |
57 | return true1; |
58 | else |
59 | #endif |
60 | return false0; |
61 | default: |
62 | return false0; |
63 | } |
64 | } |
65 | |
66 | static int amdgpu_fru_read_eeprom(struct amdgpu_device *adev, uint32_t addrptr, |
67 | unsigned char *buff) |
68 | { |
69 | int ret, size; |
70 | struct i2c_msg msg = { |
71 | .addr = I2C_PRODUCT_INFO_ADDR0xAC, |
72 | .flags = I2C_M_RD0x0001, |
73 | .buf = buff, |
74 | }; |
75 | buff[0] = 0; |
76 | buff[1] = addrptr; |
77 | msg.len = I2C_PRODUCT_INFO_ADDR_SIZE0x2 + 1; |
78 | ret = i2c_transfer(&adev->pm.smu_i2c, &msg, 1); |
79 | |
80 | if (ret < 1) { |
81 | DRM_WARN("FRU: Failed to get size field")printk("\0014" "[" "drm" "] " "FRU: Failed to get size field" ); |
82 | return ret; |
83 | } |
84 | |
85 | /* The size returned by the i2c requires subtraction of 0xC0 since the |
86 | * size apparently always reports as 0xC0+actual size. |
87 | */ |
88 | size = buff[2] - I2C_PRODUCT_INFO_OFFSET0xC0; |
89 | /* Add 1 since address field was 1 byte */ |
90 | buff[1] = addrptr + 1; |
91 | |
92 | msg.len = I2C_PRODUCT_INFO_ADDR_SIZE0x2 + size; |
93 | ret = i2c_transfer(&adev->pm.smu_i2c, &msg, 1); |
94 | |
95 | if (ret < 1) { |
96 | DRM_WARN("FRU: Failed to get data field")printk("\0014" "[" "drm" "] " "FRU: Failed to get data field" ); |
97 | return ret; |
98 | } |
99 | |
100 | return size; |
101 | } |
102 | |
103 | int amdgpu_fru_get_product_info(struct amdgpu_device *adev) |
104 | { |
105 | unsigned char buff[34]; |
106 | int addrptr, size; |
107 | int len; |
108 | |
109 | if (!is_fru_eeprom_supported(adev)) |
110 | return 0; |
111 | |
112 | /* If algo exists, it means that the i2c_adapter's initialized */ |
113 | if (!adev->pm.smu_i2c.algo) { |
114 | DRM_WARN("Cannot access FRU, EEPROM accessor not initialized")printk("\0014" "[" "drm" "] " "Cannot access FRU, EEPROM accessor not initialized" ); |
115 | return -ENODEV19; |
116 | } |
117 | |
118 | /* There's a lot of repetition here. This is due to the FRU having |
119 | * variable-length fields. To get the information, we have to find the |
120 | * size of each field, and then keep reading along and reading along |
121 | * until we get all of the data that we want. We use addrptr to track |
122 | * the address as we go |
123 | */ |
124 | |
125 | /* The first fields are all of size 1-byte, from 0-7 are offsets that |
126 | * contain information that isn't useful to us. |
127 | * Bytes 8-a are all 1-byte and refer to the size of the entire struct, |
128 | * and the language field, so just start from 0xb, manufacturer size |
129 | */ |
130 | addrptr = 0xb; |
131 | size = amdgpu_fru_read_eeprom(adev, addrptr, buff); |
132 | if (size < 1) { |
133 | DRM_ERROR("Failed to read FRU Manufacturer, ret:%d", size)__drm_err("Failed to read FRU Manufacturer, ret:%d", size); |
134 | return -EINVAL22; |
135 | } |
136 | |
137 | /* Increment the addrptr by the size of the field, and 1 due to the |
138 | * size field being 1 byte. This pattern continues below. |
139 | */ |
140 | addrptr += size + 1; |
141 | size = amdgpu_fru_read_eeprom(adev, addrptr, buff); |
142 | if (size < 1) { |
143 | DRM_ERROR("Failed to read FRU product name, ret:%d", size)__drm_err("Failed to read FRU product name, ret:%d", size); |
144 | return -EINVAL22; |
145 | } |
146 | |
147 | len = size; |
148 | /* Product name should only be 32 characters. Any more, |
149 | * and something could be wrong. Cap it at 32 to be safe |
150 | */ |
151 | if (len >= sizeof(adev->product_name)) { |
152 | DRM_WARN("FRU Product Number is larger than 32 characters. This is likely a mistake")printk("\0014" "[" "drm" "] " "FRU Product Number is larger than 32 characters. This is likely a mistake" ); |
153 | len = sizeof(adev->product_name) - 1; |
154 | } |
155 | /* Start at 2 due to buff using fields 0 and 1 for the address */ |
156 | memcpy(adev->product_name, &buff[2], len)__builtin_memcpy((adev->product_name), (&buff[2]), (len )); |
157 | adev->product_name[len] = '\0'; |
158 | |
159 | addrptr += size + 1; |
160 | size = amdgpu_fru_read_eeprom(adev, addrptr, buff); |
161 | if (size < 1) { |
162 | DRM_ERROR("Failed to read FRU product number, ret:%d", size)__drm_err("Failed to read FRU product number, ret:%d", size); |
163 | return -EINVAL22; |
164 | } |
165 | |
166 | len = size; |
167 | /* Product number should only be 16 characters. Any more, |
168 | * and something could be wrong. Cap it at 16 to be safe |
169 | */ |
170 | if (len >= sizeof(adev->product_number)) { |
171 | DRM_WARN("FRU Product Number is larger than 16 characters. This is likely a mistake")printk("\0014" "[" "drm" "] " "FRU Product Number is larger than 16 characters. This is likely a mistake" ); |
172 | len = sizeof(adev->product_number) - 1; |
173 | } |
174 | memcpy(adev->product_number, &buff[2], len)__builtin_memcpy((adev->product_number), (&buff[2]), ( len)); |
175 | adev->product_number[len] = '\0'; |
176 | |
177 | addrptr += size + 1; |
178 | size = amdgpu_fru_read_eeprom(adev, addrptr, buff); |
179 | |
180 | if (size < 1) { |
181 | DRM_ERROR("Failed to read FRU product version, ret:%d", size)__drm_err("Failed to read FRU product version, ret:%d", size); |
182 | return -EINVAL22; |
183 | } |
184 | |
185 | addrptr += size + 1; |
186 | size = amdgpu_fru_read_eeprom(adev, addrptr, buff); |
187 | |
188 | if (size < 1) { |
189 | DRM_ERROR("Failed to read FRU serial number, ret:%d", size)__drm_err("Failed to read FRU serial number, ret:%d", size); |
190 | return -EINVAL22; |
191 | } |
192 | |
193 | len = size; |
194 | /* Serial number should only be 16 characters. Any more, |
195 | * and something could be wrong. Cap it at 16 to be safe |
196 | */ |
197 | if (len >= sizeof(adev->serial)) { |
198 | DRM_WARN("FRU Serial Number is larger than 16 characters. This is likely a mistake")printk("\0014" "[" "drm" "] " "FRU Serial Number is larger than 16 characters. This is likely a mistake" ); |
199 | len = sizeof(adev->serial) - 1; |
200 | } |
201 | memcpy(adev->serial, &buff[2], len)__builtin_memcpy((adev->serial), (&buff[2]), (len)); |
202 | adev->serial[len] = '\0'; |
203 | |
204 | return 0; |
205 | } |