linux-kernel - Re: 2.6.39.1 immediately reboots/resets on EFI system

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Message-ID: <4DEDEA73.7010900@gmail.com>
Date:	Tue, 07 Jun 2011 11:08:03 +0200
From:	Maarten Lankhorst <m.b.lankhorst@...il.com>
To:	Yinghai Lu <yinghai@...nel.org>
CC:	Matthew Garrett <mjg59@...f.ucam.org>, Jim Bos <jim876@...all.nl>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Greg KH <gregkh@...e.de>,
	"H. Peter Anvin" <hpa@...ux.intel.com>
Subject: Re: 2.6.39.1 immediately reboots/resets on EFI system

Hi,

Op 07-06-11 04:05, Yinghai Lu schreef:
> On 06/06/2011 06:41 PM, Matthew Garrett wrote:
>> On Mon, Jun 06, 2011 at 05:19:17PM -0700, Yinghai Lu wrote:
>>
>>> assume EFI in ram is not page-aligned?
>> They'll be 4K aligned at least.
>>
>
> can you get boot log with "memblock=debug"?
Well that definitely helped me isolate things. It seems some ranges are reserved already.
I added a simple patch to ignore the reservations there. Just a proof of concept,
don't rate for style. :-)

diff --git a/arch/x86/mm/memblock.c b/arch/x86/mm/memblock.c
index aa11693..013ecf5 100644
--- a/arch/x86/mm/memblock.c
+++ b/arch/x86/mm/memblock.c
@@ -8,7 +8,7 @@
 #include <linux/range.h>
 
 /* Check for already reserved areas */
-static bool __init check_with_memblock_reserved_size(u64 *addrp, u64 *sizep, u64 align)
+bool __init check_with_memblock_reserved_size(u64 *addrp, u64 *sizep, u64 align)
 {
 	struct memblock_region *r;
 	u64 addr = *addrp, last;
diff --git a/arch/x86/platform/efi/efi.c b/arch/x86/platform/efi/efi.c
index 0d3a4fa..eb3a4d9 100644
--- a/arch/x86/platform/efi/efi.c
+++ b/arch/x86/platform/efi/efi.c
@@ -304,20 +304,29 @@ static void __init print_efi_memmap(void)
 }
 #endif  /*  EFI_DEBUG  */
 
+extern bool __init check_with_memblock_reserved_size(u64 *addrp,
+							u64 *sizep,
+							u64 align);
+
 void __init efi_reserve_boot_services(void)
 {
 	void *p;
 
 	for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 		efi_memory_desc_t *md = p;
-		unsigned long long start = md->phys_addr;
-		unsigned long long size = md->num_pages << EFI_PAGE_SHIFT;
+		u64 start = md->phys_addr;
+		u64 size = md->num_pages << EFI_PAGE_SHIFT;
 
 		if (md->type != EFI_BOOT_SERVICES_CODE &&
 		    md->type != EFI_BOOT_SERVICES_DATA)
 			continue;
-
-		memblock_x86_reserve_range(start, start + size, "EFI Boot");
+		if (check_with_memblock_reserved_size(&start, &size, 1<<EFI_PAGE_SHIFT)) {
+			/* Could not reserve, skip it */
+			md->num_pages = 0;
+			printk(KERN_INFO PFX "Could not reserve boot area "
+				"[0x%llx - 0x%llx]\n", start, start+size);
+		} else
+			memblock_x86_reserve_range(start, start+size, "EFI Boot");
 	}
 }
 
@@ -334,6 +343,10 @@ static void __init efi_free_boot_services(void)
 		    md->type != EFI_BOOT_SERVICES_DATA)
 			continue;
 
+		/* Could not reserve boot area */
+		if (size)
+			continue;
+
 		free_bootmem_late(start, size);
 	}
 }


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