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59c1bc3a0e
Add support for deserializing the binary PCI/PCIe VPD format and storing results in memory. The VPD format is specified in "I.3. VPD Definitions" in PCI specs (2.2+) and "6.28.1 VPD Format" PCIe 4.0. As section 6.28 in PCIe 4.0 notes, the PCI Local Bus and PCIe VPD formats are binary compatible and PCIe 4.0 merely started incorporating what was already present in PCI specs. Linux kernel exposes a binary blob in the VPD format via sysfs since v2.6.26 (commit 94e6108803469a37ee1e3c92dafdd1d59298602f) which requires a parser to interpret. Reviewed-by: Daniel P. Berrangé <berrange@redhat.com> Signed-off-by: Dmitrii Shcherbakov <dmitrii.shcherbakov@canonical.com>
80 lines
3.2 KiB
C
80 lines
3.2 KiB
C
/*
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* virpcivpdpriv.h: helper APIs for working with the PCI/PCIe VPD capability
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*
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* Copyright (C) 2021 Canonical Ltd.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; If not, see
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* <http://www.gnu.org/licenses/>.
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*/
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#ifndef LIBVIRT_VIRPCIVPDPRIV_H_ALLOW
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# error "virpcivpdpriv.h may only be included by virpcivpd.c or test suites"
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#endif /* LIBVIRT_VIRPCIVPDPRIV_H_ALLOW */
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#pragma once
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#include "virpcivpd.h"
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/*
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* PCI Local bus (2.2+, Appendix I) and PCIe 4.0+ (7.9.19 VPD Capability) define
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* the VPD capability structure (8 bytes in total) and VPD registers that can be used to access
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* VPD data including:
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* bit 31 of the first 32-bit DWORD: data transfer completion flag (between the VPD data register
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* and the VPD data storage hardware);
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* bits 30:16 of the first 32-bit DWORD: VPD address of the first VPD data byte to be accessed;
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* bits 31:0 of the second 32-bit DWORD: VPD data bytes with LSB being pointed to by the VPD address.
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*
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* Given that only 15 bits (30:16) are allocated for VPD address its mask is 0x7fff.
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*/
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#define PCI_VPD_ADDR_MASK 0x7FFF
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/*
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* VPD data consists of small and large resource data types. Information within a resource type
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* consists of a 2-byte keyword, 1-byte length and data bytes (up to 255).
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*/
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#define PCI_VPD_MAX_FIELD_SIZE 255
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#define PCI_VPD_LARGE_RESOURCE_FLAG 0x80
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#define PCI_VPD_STRING_RESOURCE_FLAG 0x02
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#define PCI_VPD_READ_ONLY_LARGE_RESOURCE_FLAG 0x10
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#define PCI_VPD_READ_WRITE_LARGE_RESOURCE_FLAG 0x11
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#define PCI_VPD_RESOURCE_END_TAG 0x0F
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#define PCI_VPD_RESOURCE_END_VAL PCI_VPD_RESOURCE_END_TAG << 3
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typedef enum {
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VIR_PCI_VPD_RESOURCE_FIELD_VALUE_FORMAT_TEXT = 1,
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VIR_PCI_VPD_RESOURCE_FIELD_VALUE_FORMAT_BINARY,
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VIR_PCI_VPD_RESOURCE_FIELD_VALUE_FORMAT_RESVD,
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VIR_PCI_VPD_RESOURCE_FIELD_VALUE_FORMAT_RDWR,
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VIR_PCI_VPD_RESOURCE_FIELD_VALUE_FORMAT_LAST
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} virPCIVPDResourceFieldValueFormat;
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virPCIVPDResourceFieldValueFormat virPCIVPDResourceGetFieldValueFormat(const char *value);
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bool virPCIVPDResourceIsValidTextValue(const char *value);
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gboolean
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virPCIVPDResourceCustomCompareIndex(virPCIVPDResourceCustom *a, virPCIVPDResourceCustom *b);
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bool
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virPCIVPDResourceCustomUpsertValue(GPtrArray *arr, char index, const char *const value);
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size_t
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virPCIVPDReadVPDBytes(int vpdFileFd, uint8_t *buf, size_t count, off_t offset, uint8_t *csum);
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bool virPCIVPDParseVPDLargeResourceFields(int vpdFileFd, uint16_t resPos, uint16_t resDataLen,
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bool readOnly, uint8_t *csum, virPCIVPDResource *res);
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bool virPCIVPDParseVPDLargeResourceString(int vpdFileFd, uint16_t resPos, uint16_t resDataLen,
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uint8_t *csum, virPCIVPDResource *res);
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