forge/linux-uconsole
1
0
Fork 0
Code Issues 1 Pull requests Projects Releases Packages Wiki Activity Actions

ibft: Fix finding IBFT ACPI table on UEFI

Browse source 
commit 935a9fee51 upstream.

Found one system with UEFI/iBFT, kernel does not detect the iBFT during
iscsi_ibft module loading.

Root cause: on x86 (UEFI), we are calling of find_ibft_region() much earlier
- specifically in setup_arch() before ACPI is enabled.

Try to split acpi checking code out and call that later

At that time ACPI iBFT already get permanent mapped with ioremap.
So isa_virt_to_bus() will get wrong phys from right virt address.
We could just skip that phys address printing.

For legacy one, print the found address early.

-v2: update comments and description according to Konrad.
-v3: fix problem about module use case that is found by Konrad.
-v4: use acpi_get_table() instead of acpi_table_parse() to handle module use case that is found by Konrad again..
Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Konrad Rzeszutek Wilk <konrad@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Yinghai Lu 2011-12-12 12:39:14 -08:00 • committed by Greg Kroah-Hartman
commit 02ca05666d
2 changed files with 42 additions and 26 deletions
Download patch file Download diff file Expand all files Collapse all files

42
drivers/firmware/iscsi_ibft.c
View file

@ -738,6 +738,37 @@ static void __exit ibft_exit(void)
ibft_cleanup();
}
#ifdef CONFIG_ACPI
static const struct {
char *sign;
} ibft_signs[] = {
/*
* One spec says "IBFT", the other says "iBFT". We have to check
* for both.
*/
{ ACPI_SIG_IBFT },
{ "iBFT" },
};
static void __init acpi_find_ibft_region(void)
{
int i;
struct acpi_table_header *table = NULL;
if (acpi_disabled)
return;
for (i = 0; i < ARRAY_SIZE(ibft_signs) && !ibft_addr; i++) {
acpi_get_table(ibft_signs[i].sign, 0, &table);
ibft_addr = (struct acpi_table_ibft *)table;
}
}
#else
static void __init acpi_find_ibft_region(void)
{
}
#endif
/*
* ibft_init() - creates sysfs tree entries for the iBFT data.
*/
@ -745,9 +776,16 @@ static int __init ibft_init(void)
{
int rc = 0;
/*
As on UEFI systems the setup_arch()/find_ibft_region()
is called before ACPI tables are parsed and it only does
legacy finding.
*/
if (!ibft_addr)
acpi_find_ibft_region();
if (ibft_addr) {
printk(KERN_INFO "iBFT detected at 0x%llx.\n",
(u64)isa_virt_to_bus(ibft_addr));
pr_info("iBFT detected.\n");
rc = ibft_check_device();
if (rc)

26
drivers/firmware/iscsi_ibft_find.c
View file

@ -45,13 +45,6 @@ EXPORT_SYMBOL_GPL(ibft_addr);
static const struct {
char *sign;
} ibft_signs[] = {
#ifdef CONFIG_ACPI
/*
* One spec says "IBFT", the other says "iBFT". We have to check
* for both.
*/
{ ACPI_SIG_IBFT },
#endif
{ "iBFT" },
{ "BIFT" }, /* Broadcom iSCSI Offload */
};
@ -62,14 +55,6 @@ static const struct {
#define VGA_MEM 0xA0000 /* VGA buffer */
#define VGA_SIZE 0x20000 /* 128kB */
#ifdef CONFIG_ACPI
static int __init acpi_find_ibft(struct acpi_table_header *header)
{
ibft_addr = (struct acpi_table_ibft *)header;
return 0;
}
#endif /* CONFIG_ACPI */
static int __init find_ibft_in_mem(void)
{
unsigned long pos;
@ -94,6 +79,7 @@ static int __init find_ibft_in_mem(void)
* the table cannot be valid. */
if (pos + len <= (IBFT_END-1)) {
ibft_addr = (struct acpi_table_ibft *)virt;
pr_info("iBFT found at 0x%lx.\n", pos);
goto done;
}
}
@ -108,20 +94,12 @@ done:
*/
unsigned long __init find_ibft_region(unsigned long *sizep)
{
#ifdef CONFIG_ACPI
int i;
#endif
ibft_addr = NULL;
#ifdef CONFIG_ACPI
for (i = 0; i < ARRAY_SIZE(ibft_signs) && !ibft_addr; i++)
acpi_table_parse(ibft_signs[i].sign, acpi_find_ibft);
#endif /* CONFIG_ACPI */
/* iBFT 1.03 section 1.4.3.1 mandates that UEFI machines will
* only use ACPI for this */
if (!ibft_addr && !efi_enabled)
if (!efi_enabled)
find_ibft_in_mem();
if (ibft_addr) {