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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-27 10:05:51 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-27 10:05:51 +0000
commit5d1646d90e1f2cceb9f0828f4b28318cd0ec7744 (patch)
treea94efe259b9009378be6d90eb30d2b019d95c194 /lib/pldmfw
parentInitial commit. (diff)
downloadlinux-5d1646d90e1f2cceb9f0828f4b28318cd0ec7744.tar.xz
linux-5d1646d90e1f2cceb9f0828f4b28318cd0ec7744.zip
Adding upstream version 5.10.209.upstream/5.10.209upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'lib/pldmfw')
-rw-r--r--lib/pldmfw/Makefile2
-rw-r--r--lib/pldmfw/pldmfw.c879
-rw-r--r--lib/pldmfw/pldmfw_private.h238
3 files changed, 1119 insertions, 0 deletions
diff --git a/lib/pldmfw/Makefile b/lib/pldmfw/Makefile
new file mode 100644
index 000000000..99ad10711
--- /dev/null
+++ b/lib/pldmfw/Makefile
@@ -0,0 +1,2 @@
+# SPDX-License-Identifier: GPL-2.0-only
+obj-$(CONFIG_PLDMFW) += pldmfw.o
diff --git a/lib/pldmfw/pldmfw.c b/lib/pldmfw/pldmfw.c
new file mode 100644
index 000000000..e5d4b3b2a
--- /dev/null
+++ b/lib/pldmfw/pldmfw.c
@@ -0,0 +1,879 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (C) 2018-2019, Intel Corporation. */
+
+#include <asm/unaligned.h>
+#include <linux/crc32.h>
+#include <linux/device.h>
+#include <linux/firmware.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/pldmfw.h>
+#include <linux/slab.h>
+#include <linux/uuid.h>
+
+#include "pldmfw_private.h"
+
+/* Internal structure used to store details about the PLDM image file as it is
+ * being validated and processed.
+ */
+struct pldmfw_priv {
+ struct pldmfw *context;
+ const struct firmware *fw;
+
+ /* current offset of firmware image */
+ size_t offset;
+
+ struct list_head records;
+ struct list_head components;
+
+ /* PLDM Firmware Package Header */
+ const struct __pldm_header *header;
+ u16 total_header_size;
+
+ /* length of the component bitmap */
+ u16 component_bitmap_len;
+ u16 bitmap_size;
+
+ /* Start of the component image information */
+ u16 component_count;
+ const u8 *component_start;
+
+ /* Start pf the firmware device id records */
+ const u8 *record_start;
+ u8 record_count;
+
+ /* The CRC at the end of the package header */
+ u32 header_crc;
+
+ struct pldmfw_record *matching_record;
+};
+
+/**
+ * pldm_check_fw_space - Verify that the firmware image has space left
+ * @data: pointer to private data
+ * @offset: offset to start from
+ * @length: length to check for
+ *
+ * Verify that the firmware data can hold a chunk of bytes with the specified
+ * offset and length.
+ *
+ * Returns: zero on success, or -EFAULT if the image does not have enough
+ * space left to fit the expected length.
+ */
+static int
+pldm_check_fw_space(struct pldmfw_priv *data, size_t offset, size_t length)
+{
+ size_t expected_size = offset + length;
+ struct device *dev = data->context->dev;
+
+ if (data->fw->size < expected_size) {
+ dev_dbg(dev, "Firmware file size smaller than expected. Got %zu bytes, needed %zu bytes\n",
+ data->fw->size, expected_size);
+ return -EFAULT;
+ }
+
+ return 0;
+}
+
+/**
+ * pldm_move_fw_offset - Move the current firmware offset forward
+ * @data: pointer to private data
+ * @bytes_to_move: number of bytes to move the offset forward by
+ *
+ * Check that there is enough space past the current offset, and then move the
+ * offset forward by this ammount.
+ *
+ * Returns: zero on success, or -EFAULT if the image is too small to fit the
+ * expected length.
+ */
+static int
+pldm_move_fw_offset(struct pldmfw_priv *data, size_t bytes_to_move)
+{
+ int err;
+
+ err = pldm_check_fw_space(data, data->offset, bytes_to_move);
+ if (err)
+ return err;
+
+ data->offset += bytes_to_move;
+
+ return 0;
+}
+
+/**
+ * pldm_parse_header - Validate and extract details about the PLDM header
+ * @data: pointer to private data
+ *
+ * Performs initial basic verification of the PLDM image, up to the first
+ * firmware record.
+ *
+ * This includes the following checks and extractions
+ *
+ * * Verify that the UUID at the start of the header matches the expected
+ * value as defined in the DSP0267 PLDM specification
+ * * Check that the revision is 0x01
+ * * Extract the total header_size and verify that the image is large enough
+ * to contain at least the length of this header
+ * * Extract the size of the component bitmap length
+ * * Extract a pointer to the start of the record area
+ *
+ * Returns: zero on success, or a negative error code on failure.
+ */
+static int pldm_parse_header(struct pldmfw_priv *data)
+{
+ const struct __pldmfw_record_area *record_area;
+ struct device *dev = data->context->dev;
+ const struct __pldm_header *header;
+ size_t header_size;
+ int err;
+
+ err = pldm_move_fw_offset(data, sizeof(*header));
+ if (err)
+ return err;
+
+ header = (const struct __pldm_header *)data->fw->data;
+ data->header = header;
+
+ if (!uuid_equal(&header->id, &pldm_firmware_header_id)) {
+ dev_dbg(dev, "Invalid package header identifier. Expected UUID %pUB, but got %pUB\n",
+ &pldm_firmware_header_id, &header->id);
+ return -EINVAL;
+ }
+
+ if (header->revision != PACKAGE_HEADER_FORMAT_REVISION) {
+ dev_dbg(dev, "Invalid package header revision. Expected revision %u but got %u\n",
+ PACKAGE_HEADER_FORMAT_REVISION, header->revision);
+ return -EOPNOTSUPP;
+ }
+
+ data->total_header_size = get_unaligned_le16(&header->size);
+ header_size = data->total_header_size - sizeof(*header);
+
+ err = pldm_check_fw_space(data, data->offset, header_size);
+ if (err)
+ return err;
+
+ data->component_bitmap_len =
+ get_unaligned_le16(&header->component_bitmap_len);
+
+ if (data->component_bitmap_len % 8 != 0) {
+ dev_dbg(dev, "Invalid component bitmap length. The length is %u, which is not a multiple of 8\n",
+ data->component_bitmap_len);
+ return -EINVAL;
+ }
+
+ data->bitmap_size = data->component_bitmap_len / 8;
+
+ err = pldm_move_fw_offset(data, header->version_len);
+ if (err)
+ return err;
+
+ /* extract a pointer to the record area, which just follows the main
+ * PLDM header data.
+ */
+ record_area = (const struct __pldmfw_record_area *)(data->fw->data +
+ data->offset);
+
+ err = pldm_move_fw_offset(data, sizeof(*record_area));
+ if (err)
+ return err;
+
+ data->record_count = record_area->record_count;
+ data->record_start = record_area->records;
+
+ return 0;
+}
+
+/**
+ * pldm_check_desc_tlv_len - Check that the length matches expectation
+ * @data: pointer to image details
+ * @type: the descriptor type
+ * @size: the length from the descriptor header
+ *
+ * If the descriptor type is one of the documented descriptor types according
+ * to the standard, verify that the provided length matches.
+ *
+ * If the type is not recognized or is VENDOR_DEFINED, return zero.
+ *
+ * Returns: zero on success, or -EINVAL if the specified size of a standard
+ * TLV does not match the expected value defined for that TLV.
+ */
+static int
+pldm_check_desc_tlv_len(struct pldmfw_priv *data, u16 type, u16 size)
+{
+ struct device *dev = data->context->dev;
+ u16 expected_size;
+
+ switch (type) {
+ case PLDM_DESC_ID_PCI_VENDOR_ID:
+ case PLDM_DESC_ID_PCI_DEVICE_ID:
+ case PLDM_DESC_ID_PCI_SUBVENDOR_ID:
+ case PLDM_DESC_ID_PCI_SUBDEV_ID:
+ expected_size = 2;
+ break;
+ case PLDM_DESC_ID_PCI_REVISION_ID:
+ expected_size = 1;
+ break;
+ case PLDM_DESC_ID_PNP_VENDOR_ID:
+ expected_size = 3;
+ break;
+ case PLDM_DESC_ID_IANA_ENTERPRISE_ID:
+ case PLDM_DESC_ID_ACPI_VENDOR_ID:
+ case PLDM_DESC_ID_PNP_PRODUCT_ID:
+ case PLDM_DESC_ID_ACPI_PRODUCT_ID:
+ expected_size = 4;
+ break;
+ case PLDM_DESC_ID_UUID:
+ expected_size = 16;
+ break;
+ case PLDM_DESC_ID_VENDOR_DEFINED:
+ return 0;
+ default:
+ /* Do not report an error on an unexpected TLV */
+ dev_dbg(dev, "Found unrecognized TLV type 0x%04x\n", type);
+ return 0;
+ }
+
+ if (size != expected_size) {
+ dev_dbg(dev, "Found TLV type 0x%04x with unexpected length. Got %u bytes, but expected %u bytes\n",
+ type, size, expected_size);
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+/**
+ * pldm_parse_desc_tlvs - Check and skip past a number of TLVs
+ * @data: pointer to private data
+ * @record: pointer to the record this TLV belongs too
+ * @desc_count: descriptor count
+ *
+ * From the current offset, read and extract the descriptor TLVs, updating the
+ * current offset each time.
+ *
+ * Returns: zero on success, or a negative error code on failure.
+ */
+static int
+pldm_parse_desc_tlvs(struct pldmfw_priv *data, struct pldmfw_record *record, u8 desc_count)
+{
+ const struct __pldmfw_desc_tlv *__desc;
+ const u8 *desc_start;
+ u8 i;
+
+ desc_start = data->fw->data + data->offset;
+
+ pldm_for_each_desc_tlv(i, __desc, desc_start, desc_count) {
+ struct pldmfw_desc_tlv *desc;
+ int err;
+ u16 type, size;
+
+ err = pldm_move_fw_offset(data, sizeof(*__desc));
+ if (err)
+ return err;
+
+ type = get_unaligned_le16(&__desc->type);
+
+ /* According to DSP0267, this only includes the data field */
+ size = get_unaligned_le16(&__desc->size);
+
+ err = pldm_check_desc_tlv_len(data, type, size);
+ if (err)
+ return err;
+
+ /* check that we have space and move the offset forward */
+ err = pldm_move_fw_offset(data, size);
+ if (err)
+ return err;
+
+ desc = kzalloc(sizeof(*desc), GFP_KERNEL);
+ if (!desc)
+ return -ENOMEM;
+
+ desc->type = type;
+ desc->size = size;
+ desc->data = __desc->data;
+
+ list_add_tail(&desc->entry, &record->descs);
+ }
+
+ return 0;
+}
+
+/**
+ * pldm_parse_one_record - Verify size of one PLDM record
+ * @data: pointer to image details
+ * @__record: pointer to the record to check
+ *
+ * This function checks that the record size does not exceed either the size
+ * of the firmware file or the total length specified in the header section.
+ *
+ * It also verifies that the recorded length of the start of the record
+ * matches the size calculated by adding the static structure length, the
+ * component bitmap length, the version string length, the length of all
+ * descriptor TLVs, and the length of the package data.
+ *
+ * Returns: zero on success, or a negative error code on failure.
+ */
+static int
+pldm_parse_one_record(struct pldmfw_priv *data,
+ const struct __pldmfw_record_info *__record)
+{
+ struct pldmfw_record *record;
+ size_t measured_length;
+ int err;
+ const u8 *bitmap_ptr;
+ u16 record_len;
+ int i;
+
+ /* Make a copy and insert it into the record list */
+ record = kzalloc(sizeof(*record), GFP_KERNEL);
+ if (!record)
+ return -ENOMEM;
+
+ INIT_LIST_HEAD(&record->descs);
+ list_add_tail(&record->entry, &data->records);
+
+ /* Then check that we have space and move the offset */
+ err = pldm_move_fw_offset(data, sizeof(*__record));
+ if (err)
+ return err;
+
+ record_len = get_unaligned_le16(&__record->record_len);
+ record->package_data_len = get_unaligned_le16(&__record->package_data_len);
+ record->version_len = __record->version_len;
+ record->version_type = __record->version_type;
+
+ bitmap_ptr = data->fw->data + data->offset;
+
+ /* check that we have space for the component bitmap length */
+ err = pldm_move_fw_offset(data, data->bitmap_size);
+ if (err)
+ return err;
+
+ record->component_bitmap_len = data->component_bitmap_len;
+ record->component_bitmap = bitmap_zalloc(record->component_bitmap_len,
+ GFP_KERNEL);
+ if (!record->component_bitmap)
+ return -ENOMEM;
+
+ for (i = 0; i < data->bitmap_size; i++)
+ bitmap_set_value8(record->component_bitmap, bitmap_ptr[i], i * 8);
+
+ record->version_string = data->fw->data + data->offset;
+
+ err = pldm_move_fw_offset(data, record->version_len);
+ if (err)
+ return err;
+
+ /* Scan through the descriptor TLVs and find the end */
+ err = pldm_parse_desc_tlvs(data, record, __record->descriptor_count);
+ if (err)
+ return err;
+
+ record->package_data = data->fw->data + data->offset;
+
+ err = pldm_move_fw_offset(data, record->package_data_len);
+ if (err)
+ return err;
+
+ measured_length = data->offset - ((const u8 *)__record - data->fw->data);
+ if (measured_length != record_len) {
+ dev_dbg(data->context->dev, "Unexpected record length. Measured record length is %zu bytes, expected length is %u bytes\n",
+ measured_length, record_len);
+ return -EFAULT;
+ }
+
+ return 0;
+}
+
+/**
+ * pldm_parse_records - Locate the start of the component area
+ * @data: pointer to private data
+ *
+ * Extract the record count, and loop through each record, searching for the
+ * component area.
+ *
+ * Returns: zero on success, or a negative error code on failure.
+ */
+static int pldm_parse_records(struct pldmfw_priv *data)
+{
+ const struct __pldmfw_component_area *component_area;
+ const struct __pldmfw_record_info *record;
+ int err;
+ u8 i;
+
+ pldm_for_each_record(i, record, data->record_start, data->record_count) {
+ err = pldm_parse_one_record(data, record);
+ if (err)
+ return err;
+ }
+
+ /* Extract a pointer to the component area, which just follows the
+ * PLDM device record data.
+ */
+ component_area = (const struct __pldmfw_component_area *)(data->fw->data + data->offset);
+
+ err = pldm_move_fw_offset(data, sizeof(*component_area));
+ if (err)
+ return err;
+
+ data->component_count =
+ get_unaligned_le16(&component_area->component_image_count);
+ data->component_start = component_area->components;
+
+ return 0;
+}
+
+/**
+ * pldm_parse_components - Locate the CRC header checksum
+ * @data: pointer to private data
+ *
+ * Extract the component count, and find the pointer to the component area.
+ * Scan through each component searching for the end, which should point to
+ * the package header checksum.
+ *
+ * Extract the package header CRC and save it for verification.
+ *
+ * Returns: zero on success, or a negative error code on failure.
+ */
+static int pldm_parse_components(struct pldmfw_priv *data)
+{
+ const struct __pldmfw_component_info *__component;
+ struct device *dev = data->context->dev;
+ const u8 *header_crc_ptr;
+ int err;
+ u8 i;
+
+ pldm_for_each_component(i, __component, data->component_start, data->component_count) {
+ struct pldmfw_component *component;
+ u32 offset, size;
+
+ err = pldm_move_fw_offset(data, sizeof(*__component));
+ if (err)
+ return err;
+
+ err = pldm_move_fw_offset(data, __component->version_len);
+ if (err)
+ return err;
+
+ offset = get_unaligned_le32(&__component->location_offset);
+ size = get_unaligned_le32(&__component->size);
+
+ err = pldm_check_fw_space(data, offset, size);
+ if (err)
+ return err;
+
+ component = kzalloc(sizeof(*component), GFP_KERNEL);
+ if (!component)
+ return -ENOMEM;
+
+ component->index = i;
+ component->classification = get_unaligned_le16(&__component->classification);
+ component->identifier = get_unaligned_le16(&__component->identifier);
+ component->comparison_stamp = get_unaligned_le32(&__component->comparison_stamp);
+ component->options = get_unaligned_le16(&__component->options);
+ component->activation_method = get_unaligned_le16(&__component->activation_method);
+ component->version_type = __component->version_type;
+ component->version_len = __component->version_len;
+ component->version_string = __component->version_string;
+ component->component_data = data->fw->data + offset;
+ component->component_size = size;
+
+ list_add_tail(&component->entry, &data->components);
+ }
+
+ header_crc_ptr = data->fw->data + data->offset;
+
+ err = pldm_move_fw_offset(data, sizeof(data->header_crc));
+ if (err)
+ return err;
+
+ /* Make sure that we reached the expected offset */
+ if (data->offset != data->total_header_size) {
+ dev_dbg(dev, "Invalid firmware header size. Expected %u but got %zu\n",
+ data->total_header_size, data->offset);
+ return -EFAULT;
+ }
+
+ data->header_crc = get_unaligned_le32(header_crc_ptr);
+
+ return 0;
+}
+
+/**
+ * pldm_verify_header_crc - Verify that the CRC in the header matches
+ * @data: pointer to private data
+ *
+ * Calculates the 32-bit CRC using the standard IEEE 802.3 CRC polynomial and
+ * compares it to the value stored in the header.
+ *
+ * Returns: zero on success if the CRC matches, or -EBADMSG on an invalid CRC.
+ */
+static int pldm_verify_header_crc(struct pldmfw_priv *data)
+{
+ struct device *dev = data->context->dev;
+ u32 calculated_crc;
+ size_t length;
+
+ /* Calculate the 32-bit CRC of the header header contents up to but
+ * not including the checksum. Note that the Linux crc32_le function
+ * does not perform an expected final XOR.
+ */
+ length = data->offset - sizeof(data->header_crc);
+ calculated_crc = crc32_le(~0, data->fw->data, length) ^ ~0;
+
+ if (calculated_crc != data->header_crc) {
+ dev_dbg(dev, "Invalid CRC in firmware header. Got 0x%08x but expected 0x%08x\n",
+ calculated_crc, data->header_crc);
+ return -EBADMSG;
+ }
+
+ return 0;
+}
+
+/**
+ * pldmfw_free_priv - Free memory allocated while parsing the PLDM image
+ * @data: pointer to the PLDM data structure
+ *
+ * Loops through and clears all allocated memory associated with each
+ * allocated descriptor, record, and component.
+ */
+static void pldmfw_free_priv(struct pldmfw_priv *data)
+{
+ struct pldmfw_component *component, *c_safe;
+ struct pldmfw_record *record, *r_safe;
+ struct pldmfw_desc_tlv *desc, *d_safe;
+
+ list_for_each_entry_safe(component, c_safe, &data->components, entry) {
+ list_del(&component->entry);
+ kfree(component);
+ }
+
+ list_for_each_entry_safe(record, r_safe, &data->records, entry) {
+ list_for_each_entry_safe(desc, d_safe, &record->descs, entry) {
+ list_del(&desc->entry);
+ kfree(desc);
+ }
+
+ if (record->component_bitmap) {
+ bitmap_free(record->component_bitmap);
+ record->component_bitmap = NULL;
+ }
+
+ list_del(&record->entry);
+ kfree(record);
+ }
+}
+
+/**
+ * pldm_parse_image - parse and extract details from PLDM image
+ * @data: pointer to private data
+ *
+ * Verify that the firmware file contains valid data for a PLDM firmware
+ * file. Extract useful pointers and data from the firmware file and store
+ * them in the data structure.
+ *
+ * The PLDM firmware file format is defined in DMTF DSP0267 1.0.0. Care
+ * should be taken to use get_unaligned_le* when accessing data from the
+ * pointers in data.
+ *
+ * Returns: zero on success, or a negative error code on failure.
+ */
+static int pldm_parse_image(struct pldmfw_priv *data)
+{
+ int err;
+
+ if (WARN_ON(!(data->context->dev && data->fw->data && data->fw->size)))
+ return -EINVAL;
+
+ err = pldm_parse_header(data);
+ if (err)
+ return err;
+
+ err = pldm_parse_records(data);
+ if (err)
+ return err;
+
+ err = pldm_parse_components(data);
+ if (err)
+ return err;
+
+ return pldm_verify_header_crc(data);
+}
+
+/* these are u32 so that we can store PCI_ANY_ID */
+struct pldm_pci_record_id {
+ int vendor;
+ int device;
+ int subsystem_vendor;
+ int subsystem_device;
+};
+
+/**
+ * pldmfw_op_pci_match_record - Check if a PCI device matches the record
+ * @context: PLDM fw update structure
+ * @record: list of records extracted from the PLDM image
+ *
+ * Determine of the PCI device associated with this device matches the record
+ * data provided.
+ *
+ * Searches the descriptor TLVs and extracts the relevant descriptor data into
+ * a pldm_pci_record_id. This is then compared against the PCI device ID
+ * information.
+ *
+ * Returns: true if the device matches the record, false otherwise.
+ */
+bool pldmfw_op_pci_match_record(struct pldmfw *context, struct pldmfw_record *record)
+{
+ struct pci_dev *pdev = to_pci_dev(context->dev);
+ struct pldm_pci_record_id id = {
+ .vendor = PCI_ANY_ID,
+ .device = PCI_ANY_ID,
+ .subsystem_vendor = PCI_ANY_ID,
+ .subsystem_device = PCI_ANY_ID,
+ };
+ struct pldmfw_desc_tlv *desc;
+
+ list_for_each_entry(desc, &record->descs, entry) {
+ u16 value;
+ int *ptr;
+
+ switch (desc->type) {
+ case PLDM_DESC_ID_PCI_VENDOR_ID:
+ ptr = &id.vendor;
+ break;
+ case PLDM_DESC_ID_PCI_DEVICE_ID:
+ ptr = &id.device;
+ break;
+ case PLDM_DESC_ID_PCI_SUBVENDOR_ID:
+ ptr = &id.subsystem_vendor;
+ break;
+ case PLDM_DESC_ID_PCI_SUBDEV_ID:
+ ptr = &id.subsystem_device;
+ break;
+ default:
+ /* Skip unrelated TLVs */
+ continue;
+ }
+
+ value = get_unaligned_le16(desc->data);
+ /* A value of zero for one of the descriptors is sometimes
+ * used when the record should ignore this field when matching
+ * device. For example if the record applies to any subsystem
+ * device or vendor.
+ */
+ if (value)
+ *ptr = (int)value;
+ else
+ *ptr = PCI_ANY_ID;
+ }
+
+ if ((id.vendor == PCI_ANY_ID || id.vendor == pdev->vendor) &&
+ (id.device == PCI_ANY_ID || id.device == pdev->device) &&
+ (id.subsystem_vendor == PCI_ANY_ID || id.subsystem_vendor == pdev->subsystem_vendor) &&
+ (id.subsystem_device == PCI_ANY_ID || id.subsystem_device == pdev->subsystem_device))
+ return true;
+ else
+ return false;
+}
+EXPORT_SYMBOL(pldmfw_op_pci_match_record);
+
+/**
+ * pldm_find_matching_record - Find the first matching PLDM record
+ * @data: pointer to private data
+ *
+ * Search through PLDM records and find the first matching entry. It is
+ * expected that only one entry matches.
+ *
+ * Store a pointer to the matching record, if found.
+ *
+ * Returns: zero on success, or -ENOENT if no matching record is found.
+ */
+static int pldm_find_matching_record(struct pldmfw_priv *data)
+{
+ struct pldmfw_record *record;
+
+ list_for_each_entry(record, &data->records, entry) {
+ if (data->context->ops->match_record(data->context, record)) {
+ data->matching_record = record;
+ return 0;
+ }
+ }
+
+ return -ENOENT;
+}
+
+/**
+ * pldm_send_package_data - Send firmware the package data for the record
+ * @data: pointer to private data
+ *
+ * Send the package data associated with the matching record to the firmware,
+ * using the send_pkg_data operation.
+ *
+ * Returns: zero on success, or a negative error code on failure.
+ */
+static int
+pldm_send_package_data(struct pldmfw_priv *data)
+{
+ struct pldmfw_record *record = data->matching_record;
+ const struct pldmfw_ops *ops = data->context->ops;
+
+ return ops->send_package_data(data->context, record->package_data,
+ record->package_data_len);
+}
+
+/**
+ * pldm_send_component_tables - Send component table information to firmware
+ * @data: pointer to private data
+ *
+ * Loop over each component, sending the applicable components to the firmware
+ * via the send_component_table operation.
+ *
+ * Returns: zero on success, or a negative error code on failure.
+ */
+static int
+pldm_send_component_tables(struct pldmfw_priv *data)
+{
+ unsigned long *bitmap = data->matching_record->component_bitmap;
+ struct pldmfw_component *component;
+ int err;
+
+ list_for_each_entry(component, &data->components, entry) {
+ u8 index = component->index, transfer_flag = 0;
+
+ /* Skip components which are not intended for this device */
+ if (!test_bit(index, bitmap))
+ continue;
+
+ /* determine whether this is the start, middle, end, or both
+ * the start and end of the component tables
+ */
+ if (index == find_first_bit(bitmap, data->component_bitmap_len))
+ transfer_flag |= PLDM_TRANSFER_FLAG_START;
+ if (index == find_last_bit(bitmap, data->component_bitmap_len))
+ transfer_flag |= PLDM_TRANSFER_FLAG_END;
+ if (!transfer_flag)
+ transfer_flag = PLDM_TRANSFER_FLAG_MIDDLE;
+
+ err = data->context->ops->send_component_table(data->context,
+ component,
+ transfer_flag);
+ if (err)
+ return err;
+ }
+
+ return 0;
+}
+
+/**
+ * pldm_flash_components - Program each component to device flash
+ * @data: pointer to private data
+ *
+ * Loop through each component that is active for the matching device record,
+ * and send it to the device driver for flashing.
+ *
+ * Returns: zero on success, or a negative error code on failure.
+ */
+static int pldm_flash_components(struct pldmfw_priv *data)
+{
+ unsigned long *bitmap = data->matching_record->component_bitmap;
+ struct pldmfw_component *component;
+ int err;
+
+ list_for_each_entry(component, &data->components, entry) {
+ u8 index = component->index;
+
+ /* Skip components which are not intended for this device */
+ if (!test_bit(index, bitmap))
+ continue;
+
+ err = data->context->ops->flash_component(data->context, component);
+ if (err)
+ return err;
+ }
+
+ return 0;
+}
+
+/**
+ * pldm_finalize_update - Finalize the device flash update
+ * @data: pointer to private data
+ *
+ * Tell the device driver to perform any remaining logic to complete the
+ * device update.
+ *
+ * Returns: zero on success, or a PLFM_FWU error indicating the reason for
+ * failure.
+ */
+static int pldm_finalize_update(struct pldmfw_priv *data)
+{
+ if (data->context->ops->finalize_update)
+ return data->context->ops->finalize_update(data->context);
+
+ return 0;
+}
+
+/**
+ * pldmfw_flash_image - Write a PLDM-formatted firmware image to the device
+ * @context: ops and data for firmware update
+ * @fw: firmware object pointing to the relevant firmware file to program
+ *
+ * Parse the data for a given firmware file, verifying that it is a valid PLDM
+ * formatted image that matches this device.
+ *
+ * Extract the device record Package Data and Component Tables and send them
+ * to the device firmware. Extract and write the flash data for each of the
+ * components indicated in the firmware file.
+ *
+ * Returns: zero on success, or a negative error code on failure.
+ */
+int pldmfw_flash_image(struct pldmfw *context, const struct firmware *fw)
+{
+ struct pldmfw_priv *data;
+ int err;
+
+ data = kzalloc(sizeof(*data), GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ INIT_LIST_HEAD(&data->records);
+ INIT_LIST_HEAD(&data->components);
+
+ data->fw = fw;
+ data->context = context;
+
+ err = pldm_parse_image(data);
+ if (err)
+ goto out_release_data;
+
+ err = pldm_find_matching_record(data);
+ if (err)
+ goto out_release_data;
+
+ err = pldm_send_package_data(data);
+ if (err)
+ goto out_release_data;
+
+ err = pldm_send_component_tables(data);
+ if (err)
+ goto out_release_data;
+
+ err = pldm_flash_components(data);
+ if (err)
+ goto out_release_data;
+
+ err = pldm_finalize_update(data);
+
+out_release_data:
+ pldmfw_free_priv(data);
+ kfree(data);
+
+ return err;
+}
+EXPORT_SYMBOL(pldmfw_flash_image);
+
+MODULE_AUTHOR("Jacob Keller <jacob.e.keller@intel.com>");
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("PLDM firmware flash update library");
diff --git a/lib/pldmfw/pldmfw_private.h b/lib/pldmfw/pldmfw_private.h
new file mode 100644
index 000000000..687ef2200
--- /dev/null
+++ b/lib/pldmfw/pldmfw_private.h
@@ -0,0 +1,238 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/* Copyright (C) 2018-2019, Intel Corporation. */
+
+#ifndef _PLDMFW_PRIVATE_H_
+#define _PLDMFW_PRIVATE_H_
+
+/* The following data structures define the layout of a firmware binary
+ * following the "PLDM For Firmware Update Specification", DMTF standard
+ * #DSP0267.
+ *
+ * pldmfw.c uses these structures to implement a simple engine that will parse
+ * a fw binary file in this format and perform a firmware update for a given
+ * device.
+ *
+ * Due to the variable sized data layout, alignment of fields within these
+ * structures is not guaranteed when reading. For this reason, all multi-byte
+ * field accesses should be done using the unaligned access macros.
+ * Additionally, the standard specifies that multi-byte fields are in
+ * LittleEndian format.
+ *
+ * The structure definitions are not made public, in order to keep direct
+ * accesses within code that is prepared to deal with the limitation of
+ * unaligned access.
+ */
+
+/* UUID for PLDM firmware packages: f018878c-cb7d-4943-9800-a02f059aca02 */
+static const uuid_t pldm_firmware_header_id =
+ UUID_INIT(0xf018878c, 0xcb7d, 0x4943,
+ 0x98, 0x00, 0xa0, 0x2f, 0x05, 0x9a, 0xca, 0x02);
+
+/* Revision number of the PLDM header format this code supports */
+#define PACKAGE_HEADER_FORMAT_REVISION 0x01
+
+/* timestamp104 structure defined in PLDM Base specification */
+#define PLDM_TIMESTAMP_SIZE 13
+struct __pldm_timestamp {
+ u8 b[PLDM_TIMESTAMP_SIZE];
+} __packed __aligned(1);
+
+/* Package Header Information */
+struct __pldm_header {
+ uuid_t id; /* PackageHeaderIdentifier */
+ u8 revision; /* PackageHeaderFormatRevision */
+ __le16 size; /* PackageHeaderSize */
+ struct __pldm_timestamp release_date; /* PackageReleaseDateTime */
+ __le16 component_bitmap_len; /* ComponentBitmapBitLength */
+ u8 version_type; /* PackageVersionStringType */
+ u8 version_len; /* PackageVersionStringLength */
+
+ /*
+ * DSP0267 also includes the following variable length fields at the
+ * end of this structure:
+ *
+ * PackageVersionString, length is version_len.
+ *
+ * The total size of this section is
+ * sizeof(pldm_header) + version_len;
+ */
+ u8 version_string[]; /* PackageVersionString */
+} __packed __aligned(1);
+
+/* Firmware Device ID Record */
+struct __pldmfw_record_info {
+ __le16 record_len; /* RecordLength */
+ u8 descriptor_count; /* DescriptorCount */
+ __le32 device_update_flags; /* DeviceUpdateOptionFlags */
+ u8 version_type; /* ComponentImageSetVersionType */
+ u8 version_len; /* ComponentImageSetVersionLength */
+ __le16 package_data_len; /* FirmwareDevicePackageDataLength */
+
+ /*
+ * DSP0267 also includes the following variable length fields at the
+ * end of this structure:
+ *
+ * ApplicableComponents, length is component_bitmap_len from header
+ * ComponentImageSetVersionString, length is version_len
+ * RecordDescriptors, a series of TLVs with 16bit type and length
+ * FirmwareDevicePackageData, length is package_data_len
+ *
+ * The total size of each record is
+ * sizeof(pldmfw_record_info) +
+ * component_bitmap_len (converted to bytes!) +
+ * version_len +
+ * <length of RecordDescriptors> +
+ * package_data_len
+ */
+ u8 variable_record_data[];
+} __packed __aligned(1);
+
+/* Firmware Descriptor Definition */
+struct __pldmfw_desc_tlv {
+ __le16 type; /* DescriptorType */
+ __le16 size; /* DescriptorSize */
+ u8 data[]; /* DescriptorData */
+} __aligned(1);
+
+/* Firmware Device Identification Area */
+struct __pldmfw_record_area {
+ u8 record_count; /* DeviceIDRecordCount */
+ /* This is not a struct type because the size of each record varies */
+ u8 records[];
+} __aligned(1);
+
+/* Individual Component Image Information */
+struct __pldmfw_component_info {
+ __le16 classification; /* ComponentClassfication */
+ __le16 identifier; /* ComponentIdentifier */
+ __le32 comparison_stamp; /* ComponentComparisonStamp */
+ __le16 options; /* componentOptions */
+ __le16 activation_method; /* RequestedComponentActivationMethod */
+ __le32 location_offset; /* ComponentLocationOffset */
+ __le32 size; /* ComponentSize */
+ u8 version_type; /* ComponentVersionStringType */
+ u8 version_len; /* ComponentVersionStringLength */
+
+ /*
+ * DSP0267 also includes the following variable length fields at the
+ * end of this structure:
+ *
+ * ComponentVersionString, length is version_len
+ *
+ * The total size of this section is
+ * sizeof(pldmfw_component_info) + version_len;
+ */
+ u8 version_string[]; /* ComponentVersionString */
+} __packed __aligned(1);
+
+/* Component Image Information Area */
+struct __pldmfw_component_area {
+ __le16 component_image_count;
+ /* This is not a struct type because the component size varies */
+ u8 components[];
+} __aligned(1);
+
+/**
+ * pldm_first_desc_tlv
+ * @start: byte offset of the start of the descriptor TLVs
+ *
+ * Converts the starting offset of the descriptor TLVs into a pointer to the
+ * first descriptor.
+ */
+#define pldm_first_desc_tlv(start) \
+ ((const struct __pldmfw_desc_tlv *)(start))
+
+/**
+ * pldm_next_desc_tlv
+ * @desc: pointer to a descriptor TLV
+ *
+ * Finds the pointer to the next descriptor following a given descriptor
+ */
+#define pldm_next_desc_tlv(desc) \
+ ((const struct __pldmfw_desc_tlv *)((desc)->data + \
+ get_unaligned_le16(&(desc)->size)))
+
+/**
+ * pldm_for_each_desc_tlv
+ * @i: variable to store descriptor index
+ * @desc: variable to store descriptor pointer
+ * @start: byte offset of the start of the descriptors
+ * @count: the number of descriptors
+ *
+ * for loop macro to iterate over all of the descriptors of a given PLDM
+ * record.
+ */
+#define pldm_for_each_desc_tlv(i, desc, start, count) \
+ for ((i) = 0, (desc) = pldm_first_desc_tlv(start); \
+ (i) < (count); \
+ (i)++, (desc) = pldm_next_desc_tlv(desc))
+
+/**
+ * pldm_first_record
+ * @start: byte offset of the start of the PLDM records
+ *
+ * Converts a starting offset of the PLDM records into a pointer to the first
+ * record.
+ */
+#define pldm_first_record(start) \
+ ((const struct __pldmfw_record_info *)(start))
+
+/**
+ * pldm_next_record
+ * @record: pointer to a PLDM record
+ *
+ * Finds a pointer to the next record following a given record
+ */
+#define pldm_next_record(record) \
+ ((const struct __pldmfw_record_info *) \
+ ((const u8 *)(record) + get_unaligned_le16(&(record)->record_len)))
+
+/**
+ * pldm_for_each_record
+ * @i: variable to store record index
+ * @record: variable to store record pointer
+ * @start: byte offset of the start of the records
+ * @count: the number of records
+ *
+ * for loop macro to iterate over all of the records of a PLDM file.
+ */
+#define pldm_for_each_record(i, record, start, count) \
+ for ((i) = 0, (record) = pldm_first_record(start); \
+ (i) < (count); \
+ (i)++, (record) = pldm_next_record(record))
+
+/**
+ * pldm_first_component
+ * @start: byte offset of the start of the PLDM components
+ *
+ * Convert a starting offset of the PLDM components into a pointer to the
+ * first component
+ */
+#define pldm_first_component(start) \
+ ((const struct __pldmfw_component_info *)(start))
+
+/**
+ * pldm_next_component
+ * @component: pointer to a PLDM component
+ *
+ * Finds a pointer to the next component following a given component
+ */
+#define pldm_next_component(component) \
+ ((const struct __pldmfw_component_info *)((component)->version_string + \
+ (component)->version_len))
+
+/**
+ * pldm_for_each_component
+ * @i: variable to store component index
+ * @component: variable to store component pointer
+ * @start: byte offset to the start of the first component
+ * @count: the number of components
+ *
+ * for loop macro to iterate over all of the components of a PLDM file.
+ */
+#define pldm_for_each_component(i, component, start, count) \
+ for ((i) = 0, (component) = pldm_first_component(start); \
+ (i) < (count); \
+ (i)++, (component) = pldm_next_component(component))
+
+#endif