linux-kernel - Re: [PATCH v1 03/13] powerpc/mm/32s: rework mmu_mapin

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Message-ID: <a253e9f8-1e0a-1596-e0ea-54261ac62212@c-s.fr>
Date:   Thu, 13 Dec 2018 15:51:32 +0100
From:   Christophe Leroy <christophe.leroy@....fr>
To:     Jonathan Neuschäfer <j.neuschaefer@....net>
Cc:     linuxppc-dev@...ts.ozlabs.org, Paul Mackerras <paulus@...ba.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 03/13] powerpc/mm/32s: rework mmu_mapin_ram()

Hi Again,

Le 13/12/2018 à 13:16, Christophe Leroy a écrit :
> Hi,
> 
> On 12/03/2018 09:55 PM, Jonathan Neuschäfer wrote:
>> Hi,
>>
>> On Thu, Nov 29, 2018 at 07:00:16PM +0000, Christophe Leroy wrote:
>>> This patch reworks mmu_mapin_ram() to be more generic and map as much
>>> blocks as possible. It now supports blocks not starting at address 0.
>>>
>>> It scans DBATs array to find free ones instead of forcing the use of
>>> BAT2 and BAT3.
>>>
>>> Signed-off-by: Christophe Leroy <christophe.leroy@....fr>
>>> ---
>>
>> I've just tested this series on my Wii, and starting from this patch
>> (03/13), it hangs at the following lines of output:
>>
>> [    0.000000] printk: bootconsole [udbg0] enabled
>> [    0.000000] Total memory = 319MB; using 1024kB for hash table (at 
>> (ptrval))
>>
>> Before this patch it looks like this and boots to userspace:
>>
>> [    0.000000] printk: bootconsole [udbg0] enabled
>> [    0.000000] Total memory = 319MB; using 1024kB for hash table (at 
>> (ptrval))
>> [    0.000000] Linux version 4.20.0-rc5-wii-00022-gfbb911b84755 
>> (jn@...gitude) (gcc version 8.2.0 (Debian 8.2.0-9)) #1337 PREEMPT Mon 
>> Dec 3 21:49:02 CET 2018
>> ug_udbg_init: early -> final
>> usbgecko_udbg: ready
>> [    0.000000] Using wii machine description
> 
> Can you tell/provide the .config and dts used ?
> 
> You seem to have 319MB RAM wherease arch/powerpc/boot/dts/wii.dts only 
> has 88MB Memory:
> 
>      memory {
>          device_type = "memory";
>          reg = <0x00000000 0x01800000    /* MEM1 24MB 1T-SRAM */
>                 0x10000000 0x04000000>;    /* MEM2 64MB GDDR3 */
>      };

Putting the same description in my mpc832x board DTS and doing a few 
hacks to get the WII functions called, I get the following:

[    0.000000] Top of RAM: 0x14000000, Total RAM: 0x5800000
[    0.000000] Memory hole size: 232MB
[    0.000000] Zone ranges:
[    0.000000]   DMA      [mem 0x0000000000000000-0x0000000013ffffff]
[    0.000000]   Normal   empty
[    0.000000] Movable zone start for each node
[    0.000000] Early memory node ranges
[    0.000000]   node   0: [mem 0x0000000000000000-0x00000000017fffff]
[    0.000000]   node   0: [mem 0x0000000010000000-0x0000000013ffffff]
[    0.000000] Initmem setup node 0 [mem 
0x0000000000000000-0x0000000013ffffff]
[    0.000000] On node 0 totalpages: 22528
[    0.000000]   DMA zone: 640 pages used for memmap
[    0.000000]   DMA zone: 0 pages reserved
[    0.000000]   DMA zone: 22528 pages, LIFO batch:3
[    0.000000] pcpu-alloc: s0 r0 d32768 u32768 alloc=1*32768
[    0.000000] pcpu-alloc: [0] 0
[    0.000000] Built 1 zonelists, mobility grouping on.  Total pages: 21888
[    0.000000] Kernel command line: loglevel=7 
ip=192.168.2.5:192.168.2.2::255.0
[    0.000000] Dentry cache hash table entries: 16384 (order: 4, 65536 
bytes)
[    0.000000] Inode-cache hash table entries: 8192 (order: 3, 32768 bytes)
[    0.000000] Memory: 77060K/90112K available (6548K kernel code, 1156K 
rwdata,
[    0.000000] Kernel virtual memory layout:
[    0.000000]   * 0xfffdf000..0xfffff000  : fixmap
[    0.000000]   * 0xfdffd000..0xfe000000  : early ioremap
[    0.000000]   * 0xd5000000..0xfdffd000  : vmalloc & ioremap




root@...ippro:~# cat /sys/kernel/debug/powerpc/block_address_translation
---[ Instruction Block Address Translation ]---
0: 0xc0000000-0xc0ffffff 0x00000000 Kernel EXEC coherent
1:         -
2: 0xc1000000-0xc17fffff 0x01000000 Kernel EXEC coherent
3:         -
4: 0xd0000000-0xd3ffffff 0x10000000 Kernel EXEC coherent
5:         -
6:         -
7:         -

---[ Data Block Address Translation ]---
0: 0xc0000000-0xc0ffffff 0x00000000 Kernel RW coherent
1: 0xfffe0000-0xffffffff 0x0d000000 Kernel RW no cache guarded
2: 0xc1000000-0xc17fffff 0x01000000 Kernel RW coherent
3:         -
4: 0xd0000000-0xd3ffffff 0x10000000 Kernel RW coherent
5:         -
6:         -
7:         -


Could you please provide the dmesg and 
/sys/kernel/debug/powerpc/block_address_translation from before this 
patch, so that we can compare and identify the differences if any ?

Thanks
Christophe



> 
> Christophe
> 
>> ...
>>
>> I've tested at patch 1, 2, 3, 4, and 13, so I don't know if it works
>> somewhere in the middle, but probably not.
>>
>> (And in case you're wondering about the 22 in the version string: Those
>> are mostly patches that give me a serial console.)
>>
>> I'm not sure what is going on, because I haven't looked closely at the
>> patches or tried to debug the problem. If you have some debugging tips,
>> I can try them.
>>
>>
>> Jonathan Neuschäfer
>>