1 // SPDX-License-Identifier: GPL-2.0
2 /* Copyright (C) 2018-2019, Intel Corporation. */
4 #include <asm/unaligned.h>
5 #include <linux/crc32.h>
6 #include <linux/device.h>
7 #include <linux/firmware.h>
8 #include <linux/kernel.h>
9 #include <linux/module.h>
10 #include <linux/pci.h>
11 #include <linux/pldmfw.h>
12 #include <linux/slab.h>
13 #include <linux/uuid.h>
15 #include "pldmfw_private.h"
17 /* Internal structure used to store details about the PLDM image file as it is
18 * being validated and processed.
21 struct pldmfw *context;
22 const struct firmware *fw;
24 /* current offset of firmware image */
27 struct list_head records;
28 struct list_head components;
30 /* PLDM Firmware Package Header */
31 const struct __pldm_header *header;
32 u16 total_header_size;
34 /* length of the component bitmap */
35 u16 component_bitmap_len;
38 /* Start of the component image information */
40 const u8 *component_start;
42 /* Start pf the firmware device id records */
43 const u8 *record_start;
46 /* The CRC at the end of the package header */
49 struct pldmfw_record *matching_record;
53 * pldm_check_fw_space - Verify that the firmware image has space left
54 * @data: pointer to private data
55 * @offset: offset to start from
56 * @length: length to check for
58 * Verify that the firmware data can hold a chunk of bytes with the specified
61 * Returns: zero on success, or -EFAULT if the image does not have enough
62 * space left to fit the expected length.
65 pldm_check_fw_space(struct pldmfw_priv *data, size_t offset, size_t length)
67 size_t expected_size = offset + length;
68 struct device *dev = data->context->dev;
70 if (data->fw->size < expected_size) {
71 dev_dbg(dev, "Firmware file size smaller than expected. Got %zu bytes, needed %zu bytes\n",
72 data->fw->size, expected_size);
80 * pldm_move_fw_offset - Move the current firmware offset forward
81 * @data: pointer to private data
82 * @bytes_to_move: number of bytes to move the offset forward by
84 * Check that there is enough space past the current offset, and then move the
85 * offset forward by this amount.
87 * Returns: zero on success, or -EFAULT if the image is too small to fit the
91 pldm_move_fw_offset(struct pldmfw_priv *data, size_t bytes_to_move)
95 err = pldm_check_fw_space(data, data->offset, bytes_to_move);
99 data->offset += bytes_to_move;
105 * pldm_parse_header - Validate and extract details about the PLDM header
106 * @data: pointer to private data
108 * Performs initial basic verification of the PLDM image, up to the first
111 * This includes the following checks and extractions
113 * * Verify that the UUID at the start of the header matches the expected
114 * value as defined in the DSP0267 PLDM specification
115 * * Check that the revision is 0x01
116 * * Extract the total header_size and verify that the image is large enough
117 * to contain at least the length of this header
118 * * Extract the size of the component bitmap length
119 * * Extract a pointer to the start of the record area
121 * Returns: zero on success, or a negative error code on failure.
123 static int pldm_parse_header(struct pldmfw_priv *data)
125 const struct __pldmfw_record_area *record_area;
126 struct device *dev = data->context->dev;
127 const struct __pldm_header *header;
131 err = pldm_move_fw_offset(data, sizeof(*header));
135 header = (const struct __pldm_header *)data->fw->data;
136 data->header = header;
138 if (!uuid_equal(&header->id, &pldm_firmware_header_id)) {
139 dev_dbg(dev, "Invalid package header identifier. Expected UUID %pUB, but got %pUB\n",
140 &pldm_firmware_header_id, &header->id);
144 if (header->revision != PACKAGE_HEADER_FORMAT_REVISION) {
145 dev_dbg(dev, "Invalid package header revision. Expected revision %u but got %u\n",
146 PACKAGE_HEADER_FORMAT_REVISION, header->revision);
150 data->total_header_size = get_unaligned_le16(&header->size);
151 header_size = data->total_header_size - sizeof(*header);
153 err = pldm_check_fw_space(data, data->offset, header_size);
157 data->component_bitmap_len =
158 get_unaligned_le16(&header->component_bitmap_len);
160 if (data->component_bitmap_len % 8 != 0) {
161 dev_dbg(dev, "Invalid component bitmap length. The length is %u, which is not a multiple of 8\n",
162 data->component_bitmap_len);
166 data->bitmap_size = data->component_bitmap_len / 8;
168 err = pldm_move_fw_offset(data, header->version_len);
172 /* extract a pointer to the record area, which just follows the main
175 record_area = (const struct __pldmfw_record_area *)(data->fw->data +
178 err = pldm_move_fw_offset(data, sizeof(*record_area));
182 data->record_count = record_area->record_count;
183 data->record_start = record_area->records;
189 * pldm_check_desc_tlv_len - Check that the length matches expectation
190 * @data: pointer to image details
191 * @type: the descriptor type
192 * @size: the length from the descriptor header
194 * If the descriptor type is one of the documented descriptor types according
195 * to the standard, verify that the provided length matches.
197 * If the type is not recognized or is VENDOR_DEFINED, return zero.
199 * Returns: zero on success, or -EINVAL if the specified size of a standard
200 * TLV does not match the expected value defined for that TLV.
203 pldm_check_desc_tlv_len(struct pldmfw_priv *data, u16 type, u16 size)
205 struct device *dev = data->context->dev;
209 case PLDM_DESC_ID_PCI_VENDOR_ID:
210 case PLDM_DESC_ID_PCI_DEVICE_ID:
211 case PLDM_DESC_ID_PCI_SUBVENDOR_ID:
212 case PLDM_DESC_ID_PCI_SUBDEV_ID:
215 case PLDM_DESC_ID_PCI_REVISION_ID:
218 case PLDM_DESC_ID_PNP_VENDOR_ID:
221 case PLDM_DESC_ID_IANA_ENTERPRISE_ID:
222 case PLDM_DESC_ID_ACPI_VENDOR_ID:
223 case PLDM_DESC_ID_PNP_PRODUCT_ID:
224 case PLDM_DESC_ID_ACPI_PRODUCT_ID:
227 case PLDM_DESC_ID_UUID:
230 case PLDM_DESC_ID_VENDOR_DEFINED:
233 /* Do not report an error on an unexpected TLV */
234 dev_dbg(dev, "Found unrecognized TLV type 0x%04x\n", type);
238 if (size != expected_size) {
239 dev_dbg(dev, "Found TLV type 0x%04x with unexpected length. Got %u bytes, but expected %u bytes\n",
240 type, size, expected_size);
248 * pldm_parse_desc_tlvs - Check and skip past a number of TLVs
249 * @data: pointer to private data
250 * @record: pointer to the record this TLV belongs too
251 * @desc_count: descriptor count
253 * From the current offset, read and extract the descriptor TLVs, updating the
254 * current offset each time.
256 * Returns: zero on success, or a negative error code on failure.
259 pldm_parse_desc_tlvs(struct pldmfw_priv *data, struct pldmfw_record *record, u8 desc_count)
261 const struct __pldmfw_desc_tlv *__desc;
262 const u8 *desc_start;
265 desc_start = data->fw->data + data->offset;
267 pldm_for_each_desc_tlv(i, __desc, desc_start, desc_count) {
268 struct pldmfw_desc_tlv *desc;
272 err = pldm_move_fw_offset(data, sizeof(*__desc));
276 type = get_unaligned_le16(&__desc->type);
278 /* According to DSP0267, this only includes the data field */
279 size = get_unaligned_le16(&__desc->size);
281 err = pldm_check_desc_tlv_len(data, type, size);
285 /* check that we have space and move the offset forward */
286 err = pldm_move_fw_offset(data, size);
290 desc = kzalloc(sizeof(*desc), GFP_KERNEL);
296 desc->data = __desc->data;
298 list_add_tail(&desc->entry, &record->descs);
305 * pldm_parse_one_record - Verify size of one PLDM record
306 * @data: pointer to image details
307 * @__record: pointer to the record to check
309 * This function checks that the record size does not exceed either the size
310 * of the firmware file or the total length specified in the header section.
312 * It also verifies that the recorded length of the start of the record
313 * matches the size calculated by adding the static structure length, the
314 * component bitmap length, the version string length, the length of all
315 * descriptor TLVs, and the length of the package data.
317 * Returns: zero on success, or a negative error code on failure.
320 pldm_parse_one_record(struct pldmfw_priv *data,
321 const struct __pldmfw_record_info *__record)
323 struct pldmfw_record *record;
324 size_t measured_length;
326 const u8 *bitmap_ptr;
330 /* Make a copy and insert it into the record list */
331 record = kzalloc(sizeof(*record), GFP_KERNEL);
335 INIT_LIST_HEAD(&record->descs);
336 list_add_tail(&record->entry, &data->records);
338 /* Then check that we have space and move the offset */
339 err = pldm_move_fw_offset(data, sizeof(*__record));
343 record_len = get_unaligned_le16(&__record->record_len);
344 record->package_data_len = get_unaligned_le16(&__record->package_data_len);
345 record->version_len = __record->version_len;
346 record->version_type = __record->version_type;
348 bitmap_ptr = data->fw->data + data->offset;
350 /* check that we have space for the component bitmap length */
351 err = pldm_move_fw_offset(data, data->bitmap_size);
355 record->component_bitmap_len = data->component_bitmap_len;
356 record->component_bitmap = bitmap_zalloc(record->component_bitmap_len,
358 if (!record->component_bitmap)
361 for (i = 0; i < data->bitmap_size; i++)
362 bitmap_set_value8(record->component_bitmap, bitmap_ptr[i], i * 8);
364 record->version_string = data->fw->data + data->offset;
366 err = pldm_move_fw_offset(data, record->version_len);
370 /* Scan through the descriptor TLVs and find the end */
371 err = pldm_parse_desc_tlvs(data, record, __record->descriptor_count);
375 record->package_data = data->fw->data + data->offset;
377 err = pldm_move_fw_offset(data, record->package_data_len);
381 measured_length = data->offset - ((const u8 *)__record - data->fw->data);
382 if (measured_length != record_len) {
383 dev_dbg(data->context->dev, "Unexpected record length. Measured record length is %zu bytes, expected length is %u bytes\n",
384 measured_length, record_len);
392 * pldm_parse_records - Locate the start of the component area
393 * @data: pointer to private data
395 * Extract the record count, and loop through each record, searching for the
398 * Returns: zero on success, or a negative error code on failure.
400 static int pldm_parse_records(struct pldmfw_priv *data)
402 const struct __pldmfw_component_area *component_area;
403 const struct __pldmfw_record_info *record;
407 pldm_for_each_record(i, record, data->record_start, data->record_count) {
408 err = pldm_parse_one_record(data, record);
413 /* Extract a pointer to the component area, which just follows the
414 * PLDM device record data.
416 component_area = (const struct __pldmfw_component_area *)(data->fw->data + data->offset);
418 err = pldm_move_fw_offset(data, sizeof(*component_area));
422 data->component_count =
423 get_unaligned_le16(&component_area->component_image_count);
424 data->component_start = component_area->components;
430 * pldm_parse_components - Locate the CRC header checksum
431 * @data: pointer to private data
433 * Extract the component count, and find the pointer to the component area.
434 * Scan through each component searching for the end, which should point to
435 * the package header checksum.
437 * Extract the package header CRC and save it for verification.
439 * Returns: zero on success, or a negative error code on failure.
441 static int pldm_parse_components(struct pldmfw_priv *data)
443 const struct __pldmfw_component_info *__component;
444 struct device *dev = data->context->dev;
445 const u8 *header_crc_ptr;
449 pldm_for_each_component(i, __component, data->component_start, data->component_count) {
450 struct pldmfw_component *component;
453 err = pldm_move_fw_offset(data, sizeof(*__component));
457 err = pldm_move_fw_offset(data, __component->version_len);
461 offset = get_unaligned_le32(&__component->location_offset);
462 size = get_unaligned_le32(&__component->size);
464 err = pldm_check_fw_space(data, offset, size);
468 component = kzalloc(sizeof(*component), GFP_KERNEL);
472 component->index = i;
473 component->classification = get_unaligned_le16(&__component->classification);
474 component->identifier = get_unaligned_le16(&__component->identifier);
475 component->comparison_stamp = get_unaligned_le32(&__component->comparison_stamp);
476 component->options = get_unaligned_le16(&__component->options);
477 component->activation_method = get_unaligned_le16(&__component->activation_method);
478 component->version_type = __component->version_type;
479 component->version_len = __component->version_len;
480 component->version_string = __component->version_string;
481 component->component_data = data->fw->data + offset;
482 component->component_size = size;
484 list_add_tail(&component->entry, &data->components);
487 header_crc_ptr = data->fw->data + data->offset;
489 err = pldm_move_fw_offset(data, sizeof(data->header_crc));
493 /* Make sure that we reached the expected offset */
494 if (data->offset != data->total_header_size) {
495 dev_dbg(dev, "Invalid firmware header size. Expected %u but got %zu\n",
496 data->total_header_size, data->offset);
500 data->header_crc = get_unaligned_le32(header_crc_ptr);
506 * pldm_verify_header_crc - Verify that the CRC in the header matches
507 * @data: pointer to private data
509 * Calculates the 32-bit CRC using the standard IEEE 802.3 CRC polynomial and
510 * compares it to the value stored in the header.
512 * Returns: zero on success if the CRC matches, or -EBADMSG on an invalid CRC.
514 static int pldm_verify_header_crc(struct pldmfw_priv *data)
516 struct device *dev = data->context->dev;
520 /* Calculate the 32-bit CRC of the header header contents up to but
521 * not including the checksum. Note that the Linux crc32_le function
522 * does not perform an expected final XOR.
524 length = data->offset - sizeof(data->header_crc);
525 calculated_crc = crc32_le(~0, data->fw->data, length) ^ ~0;
527 if (calculated_crc != data->header_crc) {
528 dev_dbg(dev, "Invalid CRC in firmware header. Got 0x%08x but expected 0x%08x\n",
529 calculated_crc, data->header_crc);
537 * pldmfw_free_priv - Free memory allocated while parsing the PLDM image
538 * @data: pointer to the PLDM data structure
540 * Loops through and clears all allocated memory associated with each
541 * allocated descriptor, record, and component.
543 static void pldmfw_free_priv(struct pldmfw_priv *data)
545 struct pldmfw_component *component, *c_safe;
546 struct pldmfw_record *record, *r_safe;
547 struct pldmfw_desc_tlv *desc, *d_safe;
549 list_for_each_entry_safe(component, c_safe, &data->components, entry) {
550 list_del(&component->entry);
554 list_for_each_entry_safe(record, r_safe, &data->records, entry) {
555 list_for_each_entry_safe(desc, d_safe, &record->descs, entry) {
556 list_del(&desc->entry);
560 if (record->component_bitmap) {
561 bitmap_free(record->component_bitmap);
562 record->component_bitmap = NULL;
565 list_del(&record->entry);
571 * pldm_parse_image - parse and extract details from PLDM image
572 * @data: pointer to private data
574 * Verify that the firmware file contains valid data for a PLDM firmware
575 * file. Extract useful pointers and data from the firmware file and store
576 * them in the data structure.
578 * The PLDM firmware file format is defined in DMTF DSP0267 1.0.0. Care
579 * should be taken to use get_unaligned_le* when accessing data from the
582 * Returns: zero on success, or a negative error code on failure.
584 static int pldm_parse_image(struct pldmfw_priv *data)
588 if (WARN_ON(!(data->context->dev && data->fw->data && data->fw->size)))
591 err = pldm_parse_header(data);
595 err = pldm_parse_records(data);
599 err = pldm_parse_components(data);
603 return pldm_verify_header_crc(data);
606 /* these are u32 so that we can store PCI_ANY_ID */
607 struct pldm_pci_record_id {
610 int subsystem_vendor;
611 int subsystem_device;
615 * pldmfw_op_pci_match_record - Check if a PCI device matches the record
616 * @context: PLDM fw update structure
617 * @record: list of records extracted from the PLDM image
619 * Determine of the PCI device associated with this device matches the record
622 * Searches the descriptor TLVs and extracts the relevant descriptor data into
623 * a pldm_pci_record_id. This is then compared against the PCI device ID
626 * Returns: true if the device matches the record, false otherwise.
628 bool pldmfw_op_pci_match_record(struct pldmfw *context, struct pldmfw_record *record)
630 struct pci_dev *pdev = to_pci_dev(context->dev);
631 struct pldm_pci_record_id id = {
632 .vendor = PCI_ANY_ID,
633 .device = PCI_ANY_ID,
634 .subsystem_vendor = PCI_ANY_ID,
635 .subsystem_device = PCI_ANY_ID,
637 struct pldmfw_desc_tlv *desc;
639 list_for_each_entry(desc, &record->descs, entry) {
643 switch (desc->type) {
644 case PLDM_DESC_ID_PCI_VENDOR_ID:
647 case PLDM_DESC_ID_PCI_DEVICE_ID:
650 case PLDM_DESC_ID_PCI_SUBVENDOR_ID:
651 ptr = &id.subsystem_vendor;
653 case PLDM_DESC_ID_PCI_SUBDEV_ID:
654 ptr = &id.subsystem_device;
657 /* Skip unrelated TLVs */
661 value = get_unaligned_le16(desc->data);
662 /* A value of zero for one of the descriptors is sometimes
663 * used when the record should ignore this field when matching
664 * device. For example if the record applies to any subsystem
673 if ((id.vendor == PCI_ANY_ID || id.vendor == pdev->vendor) &&
674 (id.device == PCI_ANY_ID || id.device == pdev->device) &&
675 (id.subsystem_vendor == PCI_ANY_ID || id.subsystem_vendor == pdev->subsystem_vendor) &&
676 (id.subsystem_device == PCI_ANY_ID || id.subsystem_device == pdev->subsystem_device))
681 EXPORT_SYMBOL(pldmfw_op_pci_match_record);
684 * pldm_find_matching_record - Find the first matching PLDM record
685 * @data: pointer to private data
687 * Search through PLDM records and find the first matching entry. It is
688 * expected that only one entry matches.
690 * Store a pointer to the matching record, if found.
692 * Returns: zero on success, or -ENOENT if no matching record is found.
694 static int pldm_find_matching_record(struct pldmfw_priv *data)
696 struct pldmfw_record *record;
698 list_for_each_entry(record, &data->records, entry) {
699 if (data->context->ops->match_record(data->context, record)) {
700 data->matching_record = record;
709 * pldm_send_package_data - Send firmware the package data for the record
710 * @data: pointer to private data
712 * Send the package data associated with the matching record to the firmware,
713 * using the send_pkg_data operation.
715 * Returns: zero on success, or a negative error code on failure.
718 pldm_send_package_data(struct pldmfw_priv *data)
720 struct pldmfw_record *record = data->matching_record;
721 const struct pldmfw_ops *ops = data->context->ops;
723 return ops->send_package_data(data->context, record->package_data,
724 record->package_data_len);
728 * pldm_send_component_tables - Send component table information to firmware
729 * @data: pointer to private data
731 * Loop over each component, sending the applicable components to the firmware
732 * via the send_component_table operation.
734 * Returns: zero on success, or a negative error code on failure.
737 pldm_send_component_tables(struct pldmfw_priv *data)
739 unsigned long *bitmap = data->matching_record->component_bitmap;
740 struct pldmfw_component *component;
743 list_for_each_entry(component, &data->components, entry) {
744 u8 index = component->index, transfer_flag = 0;
746 /* Skip components which are not intended for this device */
747 if (!test_bit(index, bitmap))
750 /* determine whether this is the start, middle, end, or both
751 * the start and end of the component tables
753 if (index == find_first_bit(bitmap, data->component_bitmap_len))
754 transfer_flag |= PLDM_TRANSFER_FLAG_START;
755 if (index == find_last_bit(bitmap, data->component_bitmap_len))
756 transfer_flag |= PLDM_TRANSFER_FLAG_END;
758 transfer_flag = PLDM_TRANSFER_FLAG_MIDDLE;
760 err = data->context->ops->send_component_table(data->context,
771 * pldm_flash_components - Program each component to device flash
772 * @data: pointer to private data
774 * Loop through each component that is active for the matching device record,
775 * and send it to the device driver for flashing.
777 * Returns: zero on success, or a negative error code on failure.
779 static int pldm_flash_components(struct pldmfw_priv *data)
781 unsigned long *bitmap = data->matching_record->component_bitmap;
782 struct pldmfw_component *component;
785 list_for_each_entry(component, &data->components, entry) {
786 u8 index = component->index;
788 /* Skip components which are not intended for this device */
789 if (!test_bit(index, bitmap))
792 err = data->context->ops->flash_component(data->context, component);
801 * pldm_finalize_update - Finalize the device flash update
802 * @data: pointer to private data
804 * Tell the device driver to perform any remaining logic to complete the
807 * Returns: zero on success, or a PLFM_FWU error indicating the reason for
810 static int pldm_finalize_update(struct pldmfw_priv *data)
812 if (data->context->ops->finalize_update)
813 return data->context->ops->finalize_update(data->context);
819 * pldmfw_flash_image - Write a PLDM-formatted firmware image to the device
820 * @context: ops and data for firmware update
821 * @fw: firmware object pointing to the relevant firmware file to program
823 * Parse the data for a given firmware file, verifying that it is a valid PLDM
824 * formatted image that matches this device.
826 * Extract the device record Package Data and Component Tables and send them
827 * to the device firmware. Extract and write the flash data for each of the
828 * components indicated in the firmware file.
830 * Returns: zero on success, or a negative error code on failure.
832 int pldmfw_flash_image(struct pldmfw *context, const struct firmware *fw)
834 struct pldmfw_priv *data;
837 data = kzalloc(sizeof(*data), GFP_KERNEL);
841 INIT_LIST_HEAD(&data->records);
842 INIT_LIST_HEAD(&data->components);
845 data->context = context;
847 err = pldm_parse_image(data);
849 goto out_release_data;
851 err = pldm_find_matching_record(data);
853 goto out_release_data;
855 err = pldm_send_package_data(data);
857 goto out_release_data;
859 err = pldm_send_component_tables(data);
861 goto out_release_data;
863 err = pldm_flash_components(data);
865 goto out_release_data;
867 err = pldm_finalize_update(data);
870 pldmfw_free_priv(data);
875 EXPORT_SYMBOL(pldmfw_flash_image);
877 MODULE_AUTHOR("Jacob Keller <jacob.e.keller@intel.com>");
878 MODULE_LICENSE("GPL v2");
879 MODULE_DESCRIPTION("PLDM firmware flash update library");