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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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4067a8541d
This patch adds the pci_vpd_find_info_keyword() helper function to find information field keywords within read-only and read-write large resource data type sections. Signed-off-by: Matt Carlson <mcarlson@broadcom.com> Signed-off-by: Michael Chan <mchan@broadcom.com> Acked-by: Jesse Barnes <jbarnes@virtuousgeek.org> Signed-off-by: David S. Miller <davem@davemloft.net>
62 lines
1.1 KiB
C
62 lines
1.1 KiB
C
/*
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* File: vpd.c
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* Purpose: Provide PCI VPD support
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*
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* Copyright (C) 2010 Broadcom Corporation.
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*/
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#include <linux/pci.h>
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int pci_vpd_find_tag(const u8 *buf, unsigned int off, unsigned int len, u8 rdt)
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{
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int i;
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for (i = off; i < len; ) {
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u8 val = buf[i];
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if (val & PCI_VPD_LRDT) {
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/* Don't return success of the tag isn't complete */
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if (i + PCI_VPD_LRDT_TAG_SIZE > len)
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break;
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if (val == rdt)
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return i;
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i += PCI_VPD_LRDT_TAG_SIZE +
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pci_vpd_lrdt_size(&buf[i]);
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} else {
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u8 tag = val & ~PCI_VPD_SRDT_LEN_MASK;
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if (tag == rdt)
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return i;
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if (tag == PCI_VPD_SRDT_END)
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break;
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i += PCI_VPD_SRDT_TAG_SIZE +
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pci_vpd_srdt_size(&buf[i]);
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}
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}
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return -ENOENT;
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}
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EXPORT_SYMBOL_GPL(pci_vpd_find_tag);
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int pci_vpd_find_info_keyword(const u8 *buf, unsigned int off,
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unsigned int len, const char *kw)
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{
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int i;
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for (i = off; i + PCI_VPD_INFO_FLD_HDR_SIZE <= off + len;) {
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if (buf[i + 0] == kw[0] &&
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buf[i + 1] == kw[1])
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return i;
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i += PCI_VPD_INFO_FLD_HDR_SIZE +
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pci_vpd_info_field_size(&buf[i]);
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}
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return -ENOENT;
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}
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EXPORT_SYMBOL_GPL(pci_vpd_find_info_keyword);
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