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// SPDX-License-Identifier: Apache-2.0
// Copyright (C) 2018 IBM Corp.
#include <fcntl.h>
#include <stdint.h>
#include <stdlib.h>
#include <syslog.h>
#include <sys/mman.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <algorithm>
extern "C" {
#include "common.h"
}
#include "config.h"
#include "mboxd_flash.h"
#include "mboxd_pnor_partition_table.h"
#include "pnor_partition.hpp"
#include "pnor_partition_table.hpp"
#include "xyz/openbmc_project/Common/error.hpp"
#include <phosphor-logging/log.hpp>
#include <phosphor-logging/elog-errors.hpp>
#include <memory>
#include <string>
#include <exception>
#include <stdexcept>
namespace err = sdbusplus::xyz::openbmc_project::Common::Error;
namespace fs = std::experimental::filesystem;
namespace vpnor = openpower::virtual_pnor;
/** @brief unique_ptr functor to release a char* reference. */
struct StringDeleter
{
void operator()(char* ptr) const
{
free(ptr);
}
};
using StringPtr = std::unique_ptr<char, StringDeleter>;
int init_flash_dev(struct mbox_context* context)
{
StringPtr filename(get_dev_mtd());
int fd = 0;
int rc = 0;
if (!filename)
{
MSG_ERR("Couldn't find the flash /dev/mtd partition\n");
return -1;
}
MSG_DBG("Opening %s\n", filename.get());
fd = open(filename.get(), O_RDWR);
if (fd < 0)
{
MSG_ERR("Couldn't open %s with flags O_RDWR: %s\n", filename.get(),
strerror(errno));
return -errno;
}
// Read the Flash Info
if (ioctl(fd, MEMGETINFO, &context->mtd_info) == -1)
{
MSG_ERR("Couldn't get information about MTD: %s\n", strerror(errno));
close(fd);
return -errno;
}
if (context->flash_size == 0)
{
// See comment in mboxd_flash_physical.c on why
// this is needed.
context->flash_size = context->mtd_info.size;
}
// Hostboot requires a 4K block-size to be used in the FFS flash structure
context->mtd_info.erasesize = 4096;
context->erase_size_shift = log_2(context->mtd_info.erasesize);
context->flash_bmap = NULL;
context->fds[MTD_FD].fd = -1;
close(fd);
return rc;
}
void free_flash_dev(struct mbox_context* context)
{
// No-op
}
int set_flash_bytemap(struct mbox_context* context, uint32_t offset,
uint32_t count, uint8_t val)
{
// No-op
return 0;
}
int erase_flash(struct mbox_context* context, uint32_t offset, uint32_t count)
{
// No-op
return 0;
}
/*
* copy_flash() - Copy data from the virtual pnor into a provided buffer
* @context: The mbox context pointer
* @offset: The pnor offset to copy from (bytes)
* @mem: The buffer to copy into (must be of atleast 'size' bytes)
* @size: The number of bytes to copy
* Return: Number of bytes copied on success, otherwise negative error
* code. copy_flash will copy at most 'size' bytes, but it may
* copy less.
*/
int64_t copy_flash(struct mbox_context* context, uint32_t offset, void* mem,
uint32_t size)
{
vpnor::partition::Table* table;
int rc = size;
if (!(context && context->vpnor && context->vpnor->table))
{
MSG_ERR("Trying to copy data with uninitialised context!\n");
return -MBOX_R_SYSTEM_ERROR;
}
table = context->vpnor->table;
MSG_DBG("Copy virtual pnor to %p for size 0x%.8x from offset 0x%.8x\n", mem,
size, offset);
/* The virtual PNOR partition table starts at offset 0 in the virtual
* pnor image. Check if host asked for an offset that lies within the
* partition table.
*/
size_t sz = table->size();
if (offset < sz)
{
const pnor_partition_table& toc = table->getHostTable();
rc = std::min(sz - offset, static_cast<size_t>(size));
memcpy(mem, ((uint8_t*)&toc) + offset, rc);
return rc;
}
try
{
vpnor::Request req(context, offset);
rc = req.read(mem, size);
}
catch (vpnor::UnmappedOffset& e)
{
/*
* Hooo boy. Pretend that this is valid flash so we don't have
* discontiguous regions presented to the host. Instead, fill a window
* with 0xff so the 'flash' looks erased. Writes to such regions are
* dropped on the floor, see the implementation of write_flash() below.
*/
MSG_INFO("Host requested unmapped region of %" PRId32
" bytes at offset 0x%" PRIx32 "\n",
size, offset);
uint32_t span = e.next - e.base;
rc = std::min(size, span);
memset(mem, 0xff, rc);
}
catch (std::exception& e)
{
MSG_ERR("%s\n", e.what());
phosphor::logging::commit<err::InternalFailure>();
rc = -MBOX_R_SYSTEM_ERROR;
}
return rc;
}
/*
* write_flash() - Write to the virtual pnor from a provided buffer
* @context: The mbox context pointer
* @offset: The flash offset to write to (bytes)
* @buf: The buffer to write from (must be of atleast size)
* @size: The number of bytes to write
*
* Return: 0 on success otherwise negative error code
*/
int write_flash(struct mbox_context* context, uint32_t offset, void* buf,
uint32_t count)
{
if (!(context && context->vpnor && context->vpnor->table))
{
MSG_ERR("Trying to write data with uninitialised context!\n");
return -MBOX_R_SYSTEM_ERROR;
}
vpnor::partition::Table* table = context->vpnor->table;
try
{
const struct pnor_partition& part = table->partition(offset);
if (part.data.user.data[1] & PARTITION_READONLY)
{
/* FIXME: This should be done on CREATE_WRITE_WINDOW, not here */
return -MBOX_R_WRITE_ERROR;
}
MSG_DBG("Write flash @ 0x%.8x for 0x%.8x from %p\n", offset, count,
buf);
vpnor::Request req(context, offset);
req.write(buf, count);
}
catch (vpnor::UnmappedOffset& e)
{
/* Paper over the fact that the write isn't persistent */
MSG_INFO("Dropping %d bytes host wrote to unmapped offset 0x%" PRIx32
"\n",
count, offset);
return 0;
}
catch (const vpnor::OutOfBoundsOffset& e)
{
MSG_ERR("%s\n", e.what());
return -MBOX_R_PARAM_ERROR;
}
catch (const std::exception& e)
{
MSG_ERR("%s\n", e.what());
phosphor::logging::commit<err::InternalFailure>();
return -MBOX_R_SYSTEM_ERROR;
}
return 0;
}
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