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

[Jean-Christophe PLAGNIOL-VILLARD]

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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