blob: 39bcae6197b9d31d54b60afe6284d12317d543d1 [file] [log] [blame]
#include "config.h"
#include "occ_command.hpp"
#include "elog-errors.hpp"
#include <errno.h>
#include <fcntl.h>
#include <fmt/core.h>
#include <unistd.h>
#include <org/open_power/OCC/Device/error.hpp>
#include <phosphor-logging/elog.hpp>
#include <phosphor-logging/log.hpp>
#include <algorithm>
#include <memory>
#include <string>
//#define TRACE_PACKETS
namespace open_power
{
namespace occ
{
using namespace phosphor::logging;
// Trace block of data in hex
void dump_hex(const std::vector<std::uint8_t>& data,
const unsigned int data_len)
{
unsigned int dump_length = data.size();
if ((data_len > 0) && (data_len < dump_length))
{
dump_length = data_len;
}
std::string s;
for (uint32_t i = 0; i < dump_length; i++)
{
if (i % 16 == 0)
{
s += fmt::format("{:04X}: ", i);
}
else if (i % 4 == 0)
{
s += " ";
}
s += fmt::format("{:02X}", data.at(i));
if ((i % 16 == 15) || (i == (dump_length - 1)))
{
log<level::INFO>(s.c_str());
s.clear();
}
}
}
OccCommand::OccCommand(uint8_t instance, const char* path) :
occInstance(instance), path(path),
devicePath(OCC_DEV_PATH + std::to_string((this->path.back() - '0') + 1)),
activeStatusSignal(
utils::getBus(),
sdbusRule::propertiesChanged(path, "org.open_power.OCC.Status"),
std::bind(std::mem_fn(&OccCommand::activeStatusEvent), this,
std::placeholders::_1))
{
log<level::DEBUG>(
fmt::format("OccCommand::OccCommand(path={}, devicePath={}", this->path,
devicePath)
.c_str());
}
void OccCommand::openDevice()
{
using namespace sdbusplus::org::open_power::OCC::Device::Error;
log<level::DEBUG>(
fmt::format("OccCommand::openDevice: calling open {}", devicePath)
.c_str());
fd = open(devicePath.c_str(), O_RDWR | O_NONBLOCK);
if (fd < 0)
{
const int openErrno = errno;
log<level::ERR>(
fmt::format(
"OccCommand::openDevice: open failed (errno={}, path={})",
openErrno, devicePath)
.c_str());
}
else
{
log<level::DEBUG>("OccCommand::openDevice: open success");
}
return;
}
void OccCommand::closeDevice()
{
if (fd >= 0)
{
log<level::DEBUG>("OccCommand::closeDevice: calling close()");
close(fd);
fd = -1;
}
}
CmdStatus OccCommand::send(const std::vector<uint8_t>& command,
std::vector<uint8_t>& response)
{
using namespace sdbusplus::org::open_power::OCC::Device::Error;
CmdStatus status = CmdStatus::FAILURE;
response.clear();
log<level::DEBUG>("OccCommand::send: calling openDevice()");
openDevice();
if (fd < 0)
{
// OCC is inactive; empty response
return CmdStatus::COMM_FAILURE;
}
const uint8_t cmd_type = command[0];
#ifdef TRACE_PACKETS
log<level::INFO>(
fmt::format("OCC{}: Sending 0x{:02X} command (length={}, {})",
occInstance, cmd_type, command.size(), devicePath)
.c_str());
dump_hex(command);
#else
log<level::DEBUG>("OccCommand::send: calling write()");
#endif
int retries = 1; // Allow a retry if a command fails to get valid response
do
{
auto rc = write(fd, command.data(), command.size());
const int writeErrno = errno;
if ((rc < 0) || (rc != (int)command.size()))
{
log<level::ERR>(
fmt::format(
"OccCommand::send: write(OCC{}, command:0x{:02X}) failed with errno={} (retries={})",
occInstance, cmd_type, writeErrno, retries)
.c_str());
status = CmdStatus::COMM_FAILURE;
// retry if available
continue;
}
else
{
log<level::DEBUG>("OccCommand::send: write succeeded");
}
// Now read the response. This would be the content of occ-sram
while (1)
{
uint8_t data{};
auto len = read(fd, &data, sizeof(data));
const int readErrno = errno;
if (len > 0)
{
response.emplace_back(data);
}
else if (len < 0 && readErrno == EAGAIN)
{
// We may have data coming still.
// This driver does not need a sleep for a retry.
continue;
}
else if (len == 0)
{
log<level::DEBUG>("OccCommand::send: read completed");
// We have read all that we can.
status = CmdStatus::SUCCESS;
break;
}
else
{
log<level::ERR>(
fmt::format(
"OccCommand::send: read(OCC{}, command:0x{:02X}) failed with errno={} (rspSize={}, retries={})",
occInstance, cmd_type, readErrno, response.size(),
retries)
.c_str());
status = CmdStatus::COMM_FAILURE;
break;
}
}
if (status != CmdStatus::SUCCESS)
{
// retry if available
continue;
}
if (response.size() > 2)
{
#ifdef TRACE_PACKETS
log<level::INFO>(
fmt::format(
"OCC{}: Received 0x{:02X} response (length={} w/checksum)",
occInstance, cmd_type, response.size())
.c_str());
dump_hex(response, 64);
#endif
// Validate checksum (last 2 bytes of response)
const unsigned int csumIndex = response.size() - 2;
const uint32_t rspChecksum =
(response[csumIndex] << 8) + response[csumIndex + 1];
uint32_t calcChecksum = 0;
for (unsigned int index = 0; index < csumIndex; ++index)
{
calcChecksum += response[index];
}
while (calcChecksum > 0xFFFF)
{
calcChecksum = (calcChecksum & 0xFFFF) + (calcChecksum >> 16);
}
if (calcChecksum != rspChecksum)
{
log<level::ERR>(
fmt::format("OCC{}: Checksum Mismatch: response "
"0x{:04X}, calculated 0x{:04X}",
occInstance, rspChecksum, calcChecksum)
.c_str());
dump_hex(response);
status = CmdStatus::COMM_FAILURE;
}
else
{
// Validate response was for the specified command
if (command[0] == response[1])
{
// Valid response received
// Strip off 2 byte checksum
response.pop_back();
response.pop_back();
break;
}
else
{
log<level::ERR>(
fmt::format(
"OccCommand::send: Response command mismatch "
"(sent: "
"0x{:02X}, rsp: 0x{:02X}, rsp seq#: 0x{:02X}",
command[0], response[1], response[0])
.c_str());
dump_hex(response, 64);
}
}
}
else
{
log<level::ERR>(
fmt::format(
"OccCommand::send: Invalid OCC{} response length: {}",
occInstance, response.size())
.c_str());
status = CmdStatus::FAILURE;
dump_hex(response);
}
if (retries > 0)
{
log<level::ERR>("OccCommand::send: Command will be retried");
response.clear();
}
} while (retries-- > 0);
closeDevice();
return status;
}
// Called at OCC Status change signal
void OccCommand::activeStatusEvent(sdbusplus::message_t& msg)
{
std::string statusInterface;
std::map<std::string, std::variant<bool>> msgData;
msg.read(statusInterface, msgData);
auto propertyMap = msgData.find("OccActive");
if (propertyMap != msgData.end())
{
// Extract the OccActive property
if (std::get<bool>(propertyMap->second))
{
occActive = true;
}
else
{
occActive = false;
this->closeDevice();
}
}
return;
}
} // namespace occ
} // namespace open_power