Forums - ION usage on SnapDragon 800

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ION usage on SnapDragon 800
eyalhir74
Join Date: 7 Feb 13
Posts: 6
Posted: Wed, 2014-07-02 23:58
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Hi,

  I'm trying to use ION on the snapdragon to allow for buffer sharing between CPU/GPU/Camera mainly to be
used later in an OpenCL application.

  Basically I have the following code:

   ion_user_handle_t handle = 0;

   int fd = open("/dev/ion", O_RDONLY | O_SYNC /*O_RDWR*/);

   heap_mask = ION_HEAP_TYPE_SYSTEM;
   alloc_flags = 0;
   align = 4096;
   buffer_size_in_bytes = (90 + 4095) & (~4095);

   ret = ion_alloc(fd, buffer_size_in_bytes, align, heap_mask, alloc_flags, &handle);

 

ion_alloc is a wrapper around an ioctl call with the ION_IOC_ALLOC parameter.

 

  It seems that I do get a valid fd from openinng /dev/ion (only for O_RDONLY)
but for the allocation itself, I'm getting the fhis:

07-03 06:35:17.849 I/ion     (17409): ion_ioctl: fd: 56
07-03 06:35:17.849 I/ion     (17409): ioctl c0144900 failed with code -1: No such device
 
Any ideas/suggestions are more than welcomed
 
thanks
Eyal
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Re: ION usage on SnapDragon 800
ek00000
Join Date: 11 Apr 14
Posts: 1
Posted: Fri, 2014-07-18 16:24
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Hi Eyal,

I was having the same issue is you and what fixed it for me was importing msm_ion.h:

#include <linux/msm_ion.h>

And using the following parameters:

alloc_flags = ION_FLAG_CACHED;

heap_mask = (0x1 << ION_IOMMU_HEAP_ID);

The main change to parameters is the ION_FLAG_CACHED for the alloc flags, but just in case that change alone doesn't work I've listed the heap_mask as well. I believe ION_IOMMU_HEAP_ID is the same as ION_HEAP_TYPE_SYSTEM, but not 100% sure on that. It seems like ION usage on Snapdragon is slightly different from the standard linux implementation. Hope this works for you.

- Eugene

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Re: ION usage on SnapDragon 800
eyalhir74
Join Date: 7 Feb 13
Posts: 6
Posted: Wed, 2014-07-30 22:23
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Hi Eugene,

 Thanks a lot for the answer - I'll try it out.

 Did it actually work? did you see a performance boost from using ION and OpenCL?

 

thanks

Eyal

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