mip64: kexec: Probem in allocating resevr mem

mip64: kexec: Probem in allocating resevr mem

[Vishnu Yadav]

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Hi
I am  not able to reserve the memory in mips 64 plateform for "crash kernel"

in below function of arch/mips/kernel/setup.c file of kernel code
reserve_bootmem(start, size , flags)
if i put flags= BOOTMEM_DEFAULT then this function succeeds but doesnt
reserve  mem of crash kernel .. i verified it by seeing /proc/iomem

but if i put flags= BOOTMEM_EXCLUSIVE .. this function itself fails and
again no memry is reseved.


Pls suggest me how to resevre mem regio for "crash kernel" in mips 64. NOTE-
I have applied kernel as well as user spaces patches for running kexec on
mips64.



-- 
Best Regards,

Vishnu Yadav

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Re: mip64: kexec: Probem in allocating resevr mem

[Simon Horman]

On Thu, Jan 28, 2010 at 06:36:07PM +0530, Vishnu Yadav wrote:
> Hi
> I am  not able to reserve the memory in mips 64 plateform for "crash kernel"
> 
> in below function of arch/mips/kernel/setup.c file of kernel code
> reserve_bootmem(start, size , flags)
> if i put flags= BOOTMEM_DEFAULT then this function succeeds but doesnt
> reserve  mem of crash kernel .. i verified it by seeing /proc/iomem
> 
> but if i put flags= BOOTMEM_EXCLUSIVE .. this function itself fails and
> again no memry is reseved.
> 
> 
> Pls suggest me how to resevre mem regio for "crash kernel" in mips 64. NOTE-
> I have applied kernel as well as user spaces patches for running kexec on
> mips64.

Does Maxim Uvarov's recent patch help you at all?

http://lists.infradead.org/pipermail/kexec/2010-February/003816.html

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Re: mip64: kexec: Probem in allocating resevr mem

[Maxim Uvarov]

 Vishnu Yadav,

If you don't see reserved memory region on mips in /proc/iomem than it
is definitely kernel issue. You can check:
1. you have continuous memory segment, which is enough for booting new
kernel in low 512M. (In general you can reserve memory at any address
but kernel can be booted if it is in lower 512M),
2. you specified right crashkernel= option. And it points to real
memory segment.
3. crashkernel was  parsed right in the kernel.

dmesg |grep mem - will print existence memory segments in format
X(memory size) @(at) Y(memory address).
cat /proc/iomem - should show  that memory is really reserved. If you
don't see reserved segments then you have to debug how kernel reserves
area for crashkernel (BOOT_MEM_RESERVED).

Best regards,
Maxim Uvarov.

2010/2/22 Simon Horman <horms@verge.net.au>:
> On Thu, Jan 28, 2010 at 06:36:07PM +0530, Vishnu Yadav wrote:
>> Hi
>> I am  not able to reserve the memory in mips 64 plateform for "crash kernel"
>>
>> in below function of arch/mips/kernel/setup.c file of kernel code
>> reserve_bootmem(start, size , flags)
>> if i put flags= BOOTMEM_DEFAULT then this function succeeds but doesnt
>> reserve  mem of crash kernel .. i verified it by seeing /proc/iomem
>>
>> but if i put flags= BOOTMEM_EXCLUSIVE .. this function itself fails and
>> again no memry is reseved.
>>
>>
>> Pls suggest me how to resevre mem regio for "crash kernel" in mips 64. NOTE-
>> I have applied kernel as well as user spaces patches for running kexec on
>> mips64.
>
> Does Maxim Uvarov's recent patch help you at all?
>
> http://lists.infradead.org/pipermail/kexec/2010-February/003816.html
>



-- 
Best regards,
Maxim Uvarov

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Re: mip64: kexec: Probem in allocating resevr mem

[Vishnu Yadav]

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Thanks Maxim for detailed analysys.

i could see how the
BOOT_MEM_RESERVED is used.
I think in my case since the kernel was cavium the tuned kernel. and in that
when i gave 64Mb as start address for reserving memory it worked.

Regards,
Vishnu

On Wed, Feb 24, 2010 at 1:27 AM, Maxim Uvarov <muvarov@gmail.com> wrote:

>  Vishnu Yadav,
>
> If you don't see reserved memory region on mips in /proc/iomem than it
> is definitely kernel issue. You can check:
> 1. you have continuous memory segment, which is enough for booting new
> kernel in low 512M. (In general you can reserve memory at any address
> but kernel can be booted if it is in lower 512M),
> 2. you specified right crashkernel= option. And it points to real
> memory segment.
> 3. crashkernel was  parsed right in the kernel.
>
> dmesg |grep mem - will print existence memory segments in format
> X(memory size) @(at) Y(memory address).
> cat /proc/iomem - should show  that memory is really reserved. If you
> don't see reserved segments then you have to debug how kernel reserves
> area for crashkernel (BOOT_MEM_RESERVED).
>
> Best regards,
> Maxim Uvarov.
>
> 2010/2/22 Simon Horman <horms@verge.net.au>:
>  > On Thu, Jan 28, 2010 at 06:36:07PM +0530, Vishnu Yadav wrote:
> >> Hi
> >> I am  not able to reserve the memory in mips 64 plateform for "crash
> kernel"
> >>
> >> in below function of arch/mips/kernel/setup.c file of kernel code
> >> reserve_bootmem(start, size , flags)
> >> if i put flags= BOOTMEM_DEFAULT then this function succeeds but doesnt
> >> reserve  mem of crash kernel .. i verified it by seeing /proc/iomem
> >>
> >> but if i put flags= BOOTMEM_EXCLUSIVE .. this function itself fails and
> >> again no memry is reseved.
> >>
> >>
> >> Pls suggest me how to resevre mem regio for "crash kernel" in mips 64.
> NOTE-
> >> I have applied kernel as well as user spaces patches for running kexec
> on
> >> mips64.
> >
> > Does Maxim Uvarov's recent patch help you at all?
> >
> > http://lists.infradead.org/pipermail/kexec/2010-February/003816.html
> >
>
>
>
> --
> Best regards,
> Maxim Uvarov
>



-- 
Best Regards,

Vishnu Yadav

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