| 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 | } |