Bjorn Helgaas | 7328c8f | 2018-01-26 11:45:16 -0600 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0 |
Matt Carlson | b55ac1b | 2010-02-26 14:04:41 +0000 | [diff] [blame] | 2 | /* |
| 3 | * File: vpd.c |
| 4 | * Purpose: Provide PCI VPD support |
| 5 | * |
| 6 | * Copyright (C) 2010 Broadcom Corporation. |
| 7 | */ |
| 8 | |
| 9 | #include <linux/pci.h> |
Paul Gortmaker | 363c75d | 2011-05-27 09:37:25 -0400 | [diff] [blame] | 10 | #include <linux/export.h> |
Matt Carlson | b55ac1b | 2010-02-26 14:04:41 +0000 | [diff] [blame] | 11 | |
| 12 | int pci_vpd_find_tag(const u8 *buf, unsigned int off, unsigned int len, u8 rdt) |
| 13 | { |
| 14 | int i; |
| 15 | |
| 16 | for (i = off; i < len; ) { |
| 17 | u8 val = buf[i]; |
| 18 | |
| 19 | if (val & PCI_VPD_LRDT) { |
| 20 | /* Don't return success of the tag isn't complete */ |
| 21 | if (i + PCI_VPD_LRDT_TAG_SIZE > len) |
| 22 | break; |
| 23 | |
| 24 | if (val == rdt) |
| 25 | return i; |
| 26 | |
| 27 | i += PCI_VPD_LRDT_TAG_SIZE + |
| 28 | pci_vpd_lrdt_size(&buf[i]); |
| 29 | } else { |
| 30 | u8 tag = val & ~PCI_VPD_SRDT_LEN_MASK; |
| 31 | |
| 32 | if (tag == rdt) |
| 33 | return i; |
| 34 | |
| 35 | if (tag == PCI_VPD_SRDT_END) |
| 36 | break; |
| 37 | |
| 38 | i += PCI_VPD_SRDT_TAG_SIZE + |
| 39 | pci_vpd_srdt_size(&buf[i]); |
| 40 | } |
| 41 | } |
| 42 | |
| 43 | return -ENOENT; |
| 44 | } |
| 45 | EXPORT_SYMBOL_GPL(pci_vpd_find_tag); |
Matt Carlson | 4067a85 | 2010-02-26 14:04:43 +0000 | [diff] [blame] | 46 | |
| 47 | int pci_vpd_find_info_keyword(const u8 *buf, unsigned int off, |
| 48 | unsigned int len, const char *kw) |
| 49 | { |
| 50 | int i; |
| 51 | |
| 52 | for (i = off; i + PCI_VPD_INFO_FLD_HDR_SIZE <= off + len;) { |
| 53 | if (buf[i + 0] == kw[0] && |
| 54 | buf[i + 1] == kw[1]) |
| 55 | return i; |
| 56 | |
| 57 | i += PCI_VPD_INFO_FLD_HDR_SIZE + |
| 58 | pci_vpd_info_field_size(&buf[i]); |
| 59 | } |
| 60 | |
| 61 | return -ENOENT; |
| 62 | } |
| 63 | EXPORT_SYMBOL_GPL(pci_vpd_find_info_keyword); |