Linux 2.6.39.4 in a AT91SAM9M10G45-EK 10 Mbytes dma buffer allocatiion

[Jean-Christophe PLAGNIOL-VILLARD]

On May 25, 2013, at 1:35 AM, Marcio Lima <marcio.lima54 at gmail.com> wrote:

> Thanks Jean
> 
> the image takes 10 Mbytes to be stored!

what sensor do you use?

4Mpx?

Best Regards,
J.
> 
> Regards
> Marcio
> 
> Enviado via iPhone
> 
> Em 24/05/2013, às 14:19, Jean-Christophe PLAGNIOL-VILLARD <plagnioj at jcrosoft.com> escreveu:
> 
>> On 09:35 Fri 24 May     , Marcio Campos de Lima wrote:
>>> 
>>> 
>>> 
>>> 
>>> Hi
>>> I am running Linux 2.6.39.4 in a AT91SAM9M10G45-EK platfarm. I need to
>>> allocate 10 Mbytes dma buffer to capture an image from a CMOS sensor. The
>>> board has 128Mbytes of total memory and 110 Mbytes of free memory. Can
>>> anybody help me?
>>> Thanks
>>> MArcio
>> 
>> 10MiB? why that much?
>> 
>> you can not allowcate thar much on dma_alloc_coherent you need to use CMA
>> 
>> Best Regards,
>> J.
>>> 
>>> at mm/page_alloc.c:2033 __alloc_pages_nodemask+0x140/0x5f8)
>>> ht      = 19Modules linked
>>> in:44;                                               
>>> 
>>> 
>>> fmt.fmt.pix.[] (unwind_backtrace+0x0/0xe4) from [] (warn_sl)
>>> pixelformat [] (warn_slowpath_common+0x4c/0x64) from [] (wa)
>>> =30314742;                                                                  
>>> 
>>> f[] (warn_slowpath_null+0x18/0x1c) from [] (__alloc_pages_n)
>>> mt.fmt.pix.fiel[] (__alloc_pages_nodemask+0x140/0x5f8) from [d       =
>>> c72b2[] (__dma_alloc+0x94/0x2d8) from [] (dma_all)
>>> cc8                                                                         
>>> 
>>> MARCIO[] (dma_alloc_coherent+0x54/0x60) from [] (vb2_dma_co)
>>> : init_mmap: i[] (vb2_dma_contig_alloc+0x38/0xb4) from [] ()
>>> nit                                                                         
>>> 
>>> [] (vb2_reqbufs+0x3b4/0x750) from [] (soc_camera_reqbufs+0x)
>>> [] (soc_camera_reqbufs+0xbc/0x134) from [] (__video_do_ioct)
>>> [] (__video_do_ioctl+0x1de0/0x4a24) from [] (video_usercopy)
>>> [] (video_usercopy+0x358/0x48c) from [] (v4l2_ioctl+0x68/0x)
>>> [] (v4l2_ioctl+0x68/0x114) from [] (vfs_ioctl+0x20/0x3c)    
>>> [] (vfs_ioctl+0x20/0x3c) from [] (do_vfs_ioctl+0x520/0x578) 
>>> [] (do_vfs_ioctl+0x520/0x578) from [] (sys_ioctl+0x34/0x54) 
>>> [] (sys_ioctl+0x34/0x54) from [] (ret_fast_syscall+0x0/0x2c)
>>> ---[ end trace acfd933d374f6f12
>>> ]---                                            
>>> atmel_isi atmel_isi.0: dma_alloc_coherent of size 10077696
>>> failed               
>>> MARCIO: __vb2_queue_alloc
>>> ret=-12                                               
>>> MARCIO: __vb2_queue_alloc
>>> q->num_buffers=0                                      
>>> MARCIO: vb2_reqbufs req->count=2 ret=0
>>> num_buffers=1                            
>>> MARCIO: vb2_reqbufs req->count=2 num_buffers=1
>>> ret=0                            
>>> MARCIO:vb2_reqbufs soc_camera_reqbufs ret=-12 icd->vb2_vidq=1 
>>> p=1              
>>> MARCIO:soc_camera_reqbufs
>>> ret=-12                                               
>>> VIDIOC_REQBUFS error 12, Out of memory
>>> 
>>> 
>>> 
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>> 
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