linux-kernel - [PATCH] ibft: Fix finding ibft with ACPI tables

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Message-ID: <4EE073BB.6080403@oracle.com>
Date:	Thu, 08 Dec 2011 00:22:19 -0800
From:	Yinghai Lu <yinghai.lu@...cle.com>
To:	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] ibft: Fix finding ibft with ACPI tables

Found one system with UEFI/iBFT is not detected.

the root cause: for x86, We move calling of find_ibft_region() much earlier.
in setup_arch() before ACPI is enabled.

Try to all find_ibft_region() second times in ibft_init()

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 printing.
For legacy one, print the found address early.

Signed-off-by: Yinghai Lu <yinghai.lu@...nel.org>

---
 drivers/firmware/iscsi_ibft.c      |   18 +++++++++++++++---
 drivers/firmware/iscsi_ibft_find.c |    1 +
 2 files changed, 16 insertions(+), 3 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
@@ -753,9 +753,21 @@ static int __init ibft_init(void)
 {
 	int rc = 0;
 
+	/* find that from acpi tables */
+	if (!ibft_addr) {
+		unsigned long size = 0;
+
+		find_ibft_region(&size);
+		barrier();
+	}
+
 	if (ibft_addr) {
-		printk(KERN_INFO "iBFT detected at 0x%llx.\n",
-		       (u64)isa_virt_to_bus(ibft_addr));
+		/*
+		 * Second try is from acpi permanent map with ioremap
+		 *  can not simply convert back to phys addr.
+		 *  and We don't need to print that table phys addr.
+		 */
+		pr_info("iBFT detected.\n");
 
 		rc = ibft_check_device();
 		if (rc)
@@ -770,7 +782,7 @@ static int __init ibft_init(void)
 		if (rc)
 			goto out_free;
 	} else
-		printk(KERN_INFO "No iBFT detected.\n");
+		pr_info("No iBFT detected.\n");
 
 	return 0;
 
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
@@ -94,6 +94,7 @@ 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;
 				}
 			}
--
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