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pci: Add helper to find a VPD resource data type

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This patch adds the pci_vpd_find_tag() helper function to find VPD
resource data types in a buffer.

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>
This commit is contained in:
Matt Carlson 2010-02-26 14:04:41 +00:00 committed by David S. Miller
parent 7ad506fa1a
commit b55ac1b226
5 changed files with 65 additions and 42 deletions
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24
drivers/net/bnx2.c
View File

@ -7769,28 +7769,12 @@ bnx2_read_vpd_fw_ver(struct bnx2 *bp)
}
for (i = 0; i <= BNX2_VPD_LEN - 3; ) {
unsigned char val = data[i];
unsigned int block_end;
if (val & PCI_VPD_LRDT) {
if (i + PCI_VPD_LRDT_TAG_SIZE > BNX2_VPD_LEN)
break;
if (val != PCI_VPD_LRDT_RO_DATA) {
i += PCI_VPD_LRDT_TAG_SIZE +
pci_vpd_lrdt_size(&data[i]);
continue;
}
} else {
if ((val & PCI_VPD_SRDT_TIN_MASK) == PCI_VPD_STIN_END)
break;
i += PCI_VPD_SRDT_TAG_SIZE +
pci_vpd_srdt_size(&data[i]);
continue;
}
i = pci_vpd_find_tag(data, i, BNX2_VPD_LEN,
PCI_VPD_LRDT_RO_DATA);
if (i < 0)
break;
block_end = (i + PCI_VPD_LRDT_TAG_SIZE +
pci_vpd_lrdt_size(&data[i]));

26
drivers/net/tg3.c
View File

@ -12547,7 +12547,7 @@ static int __devinit tg3_phy_probe(struct tg3 *tp)
static void __devinit tg3_read_partno(struct tg3 *tp)
{
unsigned char vpd_data[TG3_NVM_VPD_LEN]; /* in little-endian format */
unsigned int i;
int i;
u32 magic;
if ((tp->tg3_flags3 & TG3_FLG3_NO_NVRAM) ||
@ -12586,28 +12586,12 @@ static void __devinit tg3_read_partno(struct tg3 *tp)
/* Now parse and find the part number. */
for (i = 0; i < TG3_NVM_VPD_LEN - 2; ) {
unsigned char val = vpd_data[i];
unsigned int block_end;
if (val & PCI_VPD_LRDT) {
if (i + PCI_VPD_LRDT_TAG_SIZE > TG3_NVM_VPD_LEN)
break;
if (val != PCI_VPD_LRDT_RO_DATA) {
i += PCI_VPD_LRDT_TAG_SIZE +
pci_vpd_lrdt_size(&vpd_data[i]);
continue;
}
} else {
if ((val & PCI_VPD_SRDT_TIN_MASK) == PCI_VPD_STIN_END)
break;
i += PCI_VPD_SRDT_TAG_SIZE +
pci_vpd_srdt_size(&vpd_data[i]);
continue;
}
i = pci_vpd_find_tag(vpd_data, i, TG3_NVM_VPD_LEN,
PCI_VPD_LRDT_RO_DATA);
if (i < 0)
break;
block_end = i + PCI_VPD_LRDT_TAG_SIZE +
pci_vpd_lrdt_size(&vpd_data[i]);

2
drivers/pci/Makefile
View File

@ -4,7 +4,7 @@
obj-y += access.o bus.o probe.o remove.o pci.o quirks.o \
pci-driver.o search.o pci-sysfs.o rom.o setup-res.o \
irq.o
irq.o vpd.o
obj-$(CONFIG_PROC_FS) += proc.o
obj-$(CONFIG_SYSFS) += slot.o

43
drivers/pci/vpd.c Normal file
View File

@ -0,0 +1,43 @@
/*
* File: vpd.c
* Purpose: Provide PCI VPD support
*
* Copyright (C) 2010 Broadcom Corporation.
*/
#include <linux/pci.h>
int pci_vpd_find_tag(const u8 *buf, unsigned int off, unsigned int len, u8 rdt)
{
int i;
for (i = off; i < len; ) {
u8 val = buf[i];
if (val & PCI_VPD_LRDT) {
/* Don't return success of the tag isn't complete */
if (i + PCI_VPD_LRDT_TAG_SIZE > len)
break;
if (val == rdt)
return i;
i += PCI_VPD_LRDT_TAG_SIZE +
pci_vpd_lrdt_size(&buf[i]);
} else {
u8 tag = val & ~PCI_VPD_SRDT_LEN_MASK;
if (tag == rdt)
return i;
if (tag == PCI_VPD_SRDT_END)
break;
i += PCI_VPD_SRDT_TAG_SIZE +
pci_vpd_srdt_size(&buf[i]);
}
}
return -ENOENT;
}
EXPORT_SYMBOL_GPL(pci_vpd_find_tag);

12
include/linux/pci.h
View File

@ -1395,5 +1395,17 @@ static inline u8 pci_vpd_srdt_size(const u8 *srdt)
return (*srdt) & PCI_VPD_SRDT_LEN_MASK;
}
/**
* pci_vpd_find_tag - Locates the Resource Data Type tag provided
* @buf: Pointer to buffered vpd data
* @off: The offset into the buffer at which to begin the search
* @len: The length of the vpd buffer
* @rdt: The Resource Data Type to search for
*
* Returns the index where the Resource Data Type was found or
* -ENOENT otherwise.
*/
int pci_vpd_find_tag(const u8 *buf, unsigned int off, unsigned int len, u8 rdt);
#endif /* __KERNEL__ */
#endif /* LINUX_PCI_H */