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x86_64: allocate gart aperture from 512M

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because we try to reserve dma32 early, so we have chance to get aperture
from 64M.

with some sequence aperture allocated from RAM, could become E820_RESERVED.

and then if doing a kexec with a big kernel that uncompressed size is above
64M we could have a range conflict with still using gart.

So allocate gart aperture from 512M instead.

Also change the fallback_aper_order to 5, because we don't have chance to get
2G or 4G aperture.

Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Yinghai Lu 2008-04-14 20:40:37 -07:00 committed by Ingo Molnar
parent 8c9fd91a0d
commit 7677b2ef6c
2 changed files with 22 additions and 4 deletions
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20
arch/x86/kernel/aperture_64.c
View File

@ -55,8 +55,9 @@ static u32 __init allocate_aperture(void)
u32 aper_size;
void *p;
if (fallback_aper_order > 7)
fallback_aper_order = 7;
/* aper_size should <= 1G */
if (fallback_aper_order > 5)
fallback_aper_order = 5;
aper_size = (32 * 1024 * 1024) << fallback_aper_order;
/*
@ -65,7 +66,20 @@ static u32 __init allocate_aperture(void)
* memory. Unfortunately we cannot move it up because that would
* make the IOMMU useless.
*/
p = __alloc_bootmem_nopanic(aper_size, aper_size, 0);
/*
* using 512M as goal, in case kexec will load kernel_big
* that will do the on position decompress, and could overlap with
* that positon with gart that is used.
* sequende:
* kernel_small
* ==> kexec (with kdump trigger path or previous doesn't shutdown gart)
* ==> kernel_small(gart area become e820_reserved)
* ==> kexec (with kdump trigger path or previous doesn't shutdown gart)
* ==> kerne_big (uncompressed size will be big than 64M or 128M)
* so don't use 512M below as gart iommu, leave the space for kernel
* code for safe
*/
p = __alloc_bootmem_nopanic(aper_size, aper_size, 512ULL<<20);
if (!p || __pa(p)+aper_size > 0xffffffff) {
printk(KERN_ERR
"Cannot allocate aperture memory hole (%p,%uK)\n",

6
arch/x86/kernel/pci-dma.c
View File

@ -77,10 +77,14 @@ void __init dma32_reserve_bootmem(void)
if (end_pfn <= MAX_DMA32_PFN)
return;
/*
* check aperture_64.c allocate_aperture() for reason about
* using 512M as goal
*/
align = 64ULL<<20;
size = round_up(dma32_bootmem_size, align);
dma32_bootmem_ptr = __alloc_bootmem_nopanic(size, align,
__pa(MAX_DMA_ADDRESS));
512ULL<<20);
if (dma32_bootmem_ptr)
dma32_bootmem_size = size;
else