vpnor: Isolate relevant code in vpnor directory

This is prepatory work for introducing more vpnor-specific behaviours to
window handling. We will be introducing more objects to link, in order
to hook some of the window command handlers.

This change takes the opportunity to revert back to the upstream names
for some of the original C files.

Change-Id: I6b67ae466a2695054035e65ba752881be9c32d1a
Signed-off-by: Andrew Jeffery <andrew@aj.id.au>

1 files changed, 235 insertions, 0 deletions

diff --git a/vpnor/mboxd_flash.cpp b/vpnor/mboxd_flash.cpp
new file mode 100644
index 0000000..ffe75c6
--- /dev/null
+++ b/vpnor/mboxd_flash.cpp
@@ -0,0 +1,235 @@
+// 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;
+}