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Date: Thu, 08 Dec 2011 13:17:41 -0800
From: Yinghai Lu <yinghai.lu@...cle.com>
To: Konrad Rzeszutek Wilk <konrad@...nok.org>,
Peter Jones <pjones@...hat.com>,
Konrad Rzeszutek Wilk <konrad@...nel.org>
CC: Ingo Molnar <mingo@...e.hu>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
Andrew Morton <akpm@...ux-foundation.org>
Subject: [PATCH -v3] ibft: Fix finding IBFT ACPI table on UEFI
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.
Signed-off-by: Yinghai Lu <yinghai@...nel.org>
---
drivers/firmware/iscsi_ibft.c | 43 +++++++++++++++++++++++++++++++++++--
drivers/firmware/iscsi_ibft_find.c | 26 +---------------------
2 files changed, 43 insertions(+), 26 deletions(-)
Index: linux-2.6/drivers/firmware/iscsi_ibft.c
===================================================================
--- linux-2.6.orig/drivers/firmware/iscsi_ibft.c
+++ linux-2.6/drivers/firmware/iscsi_ibft.c
@@ -746,6 +746,38 @@ 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 int __init acpi_find_ibft(struct acpi_table_header *header)
+{
+ ibft_addr = (struct acpi_table_ibft *)header;
+
+ return 0;
+}
+
+static void __init acpi_find_ibft_region(void)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(ibft_signs) && !ibft_addr; i++)
+ acpi_table_parse(ibft_signs[i].sign, acpi_find_ibft);
+}
+#else
+static void __init acpi_find_ibft_region(void)
+{
+}
+#endif
+
/*
* ibft_init() - creates sysfs tree entries for the iBFT data.
*/
@@ -753,9 +785,16 @@ 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)
Index: linux-2.6/drivers/firmware/iscsi_ibft_find.c
===================================================================
--- linux-2.6.orig/drivers/firmware/iscsi_ibft_find.c
+++ linux-2.6/drivers/firmware/iscsi_ibft_find.c
@@ -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) {
--
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