Murulidhar Nataraju | 1adec02 | 2017-04-20 12:05:51 -0500 | [diff] [blame^] | 1 | #include <stdexcept> |
| 2 | #include <array> |
| 3 | #include <sbe_chipOp_handler.hpp> |
| 4 | namespace openpower |
| 5 | { |
| 6 | namespace sbe |
| 7 | { |
| 8 | namespace internal |
| 9 | { |
| 10 | /*! \union sbeRespHeader_t |
| 11 | * Defines the breakup of the SBE FIFO chip operation response header. |
| 12 | */ |
| 13 | union sbeRespHeader_t |
| 14 | { |
| 15 | uint32_t commandWord; /**<Entire 32 bit command word */ |
| 16 | struct |
| 17 | { |
| 18 | uint8_t command: 8; /**<command value for which response is obtained */ |
| 19 | uint8_t commandClass: 8; /**< Class of the command */ |
| 20 | uint16_t magic: 16; /**< Magic code obtained in the response */ |
| 21 | }; |
| 22 | } __attribute__((packed)); |
| 23 | |
| 24 | |
| 25 | constexpr uint16_t MAGIC_CODE = 0xC0DE; |
| 26 | constexpr auto SBE_OPERATION_SUCCESSFUL = 0; |
| 27 | constexpr auto LENGTH_OF_DISTANCE_HEADER_IN_WORDS = 0x1; |
| 28 | constexpr auto LENGTH_OF_RESP_HEADER_IN_WORDS = 0x2; |
| 29 | constexpr auto SBEI_SBE_RESPONSE_SIZE_IN_WORDS = ((sizeof(sbeRespHeader_t) + \ |
| 30 | sizeof(sbe_word_t)) / 4); |
| 31 | constexpr auto DISTANCE_TO_RESP_CODE = 0x1; |
| 32 | |
| 33 | std::vector<sbe_word_t> write(const char* devPath, |
| 34 | const sbe_word_t* cmdBuffer, |
| 35 | size_t cmdBufLen, |
| 36 | size_t respBufLen) |
| 37 | { |
| 38 | //TODO: Add support for reading and writing from the FIFO device |
| 39 | std::vector<sbe_word_t> response(respBufLen); |
| 40 | return response; |
| 41 | } |
| 42 | |
| 43 | std::vector<sbe_word_t> parseResponse( |
| 44 | const std::vector<sbe_word_t>& sbeDataBuf) |
| 45 | { |
| 46 | |
| 47 | //Number of 32-bit words obtained from the SBE |
| 48 | size_t lengthObtained = sbeDataBuf.size(); |
| 49 | |
| 50 | //Fetch the SBE header and SBE chiop primary and secondary status |
| 51 | //Last value in the buffer will have the offset for the SBE header |
| 52 | size_t distanceToStatusHeader = sbeDataBuf[sbeDataBuf.size() - 1]; |
| 53 | |
| 54 | if (lengthObtained < distanceToStatusHeader) |
| 55 | { |
| 56 | //TODO:use elog infrastructure |
| 57 | std::ostringstream errMsg; |
| 58 | errMsg << "Distance to SBE status header value " << |
| 59 | distanceToStatusHeader << " is greater then total lenght of " |
| 60 | "response buffer " << lengthObtained; |
| 61 | throw std::runtime_error(errMsg.str().c_str()); |
| 62 | } |
| 63 | |
| 64 | //Fetch the response header contents |
| 65 | sbeRespHeader_t l_respHeader{}; |
| 66 | auto iter = sbeDataBuf.begin(); |
| 67 | std::advance(iter, (lengthObtained - distanceToStatusHeader)); |
| 68 | l_respHeader.commandWord = *iter; |
| 69 | |
| 70 | //Fetch the primary and secondary response code |
| 71 | std::advance(iter, DISTANCE_TO_RESP_CODE); |
| 72 | auto l_priSecResp = *iter; |
| 73 | |
| 74 | //Validate the magic code obtained in the response |
| 75 | if (l_respHeader.magic != MAGIC_CODE) |
| 76 | { |
| 77 | //TODO:use elog infrastructure |
| 78 | std::ostringstream errMsg; |
| 79 | errMsg << "Invalid MAGIC keyword in the response header (" << |
| 80 | l_respHeader.magic << "),expected keyword " << MAGIC_CODE; |
| 81 | throw std::runtime_error(errMsg.str().c_str()); |
| 82 | } |
| 83 | |
| 84 | //Validate the Primary and Secondary response value |
| 85 | if (l_priSecResp != SBE_OPERATION_SUCCESSFUL) |
| 86 | { |
| 87 | //Extract the SBE FFDC and throw it to the caller |
| 88 | size_t ffdcLen = (distanceToStatusHeader - |
| 89 | SBEI_SBE_RESPONSE_SIZE_IN_WORDS - |
| 90 | LENGTH_OF_DISTANCE_HEADER_IN_WORDS); |
| 91 | if (ffdcLen) |
| 92 | { |
| 93 | std::vector<sbe_word_t> ffdcData(ffdcLen); |
| 94 | //Fetch the offset of FFDC data |
| 95 | auto ffdcOffset = (lengthObtained - distanceToStatusHeader) + |
| 96 | LENGTH_OF_RESP_HEADER_IN_WORDS; |
| 97 | std::copy_n((sbeDataBuf.begin() + ffdcOffset), ffdcLen, |
| 98 | ffdcData.begin()); |
| 99 | } |
| 100 | |
| 101 | //TODO:use elog infrastructure to return the SBE and Hardware procedure |
| 102 | //FFDC container back to the caller. |
| 103 | std::ostringstream errMsg; |
| 104 | errMsg << "Chip operation failed with SBE response code:" << l_priSecResp |
| 105 | << ".Length of FFDC data of obtained:" << ffdcLen; |
| 106 | throw std::runtime_error(errMsg.str().c_str()); |
| 107 | } |
| 108 | return sbeDataBuf; |
| 109 | |
| 110 | } |
| 111 | |
| 112 | } |
| 113 | } |
| 114 | } |
| 115 | |
| 116 | |