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ibft: Fix finding IBFT ACPI table on UEFI

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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>
This commit is contained in:
Yinghai Lu
2011-12-12 12:39:14 -08:00
committed by Konrad Rzeszutek Wilk
parent 5611cc4572
commit 935a9fee51
2 changed files with 42 additions and 26 deletions
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26
drivers/firmware/iscsi_ibft_find.c
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@@ -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) {