SCSI Generic with NUMA setup

[Dan Oelke]

I am attempting to modify kernel to get it to work for my somewhat weird system.

I have a flash device and that device is attached to a separate bank of RAM that the data for a SCSI Read/Write data will be directed to. This is a UFS flash device and I have the UFS device driver working at a basic level at least.



Now I am attempting to do a read or write SCSI command.  I am doing this using ioctl(fd, SG_IO, sg_io_hdr)  I am familiar with SCSI so I have the CDB all set no problem. In that io_hdr I want to set the dxferp to an address in that separate bank of memory.  This would be an address That is from the point of view of the UFS/HCI controller and not an address that is relevant to the CPU.


I’ve been reading through the scsi_lib.c and sg_ioctl code as well as the ufshcd_queuecommand. The problem is that this all centers on going through the block interface and setting up sglist there.  However, I don’t want those sglists. The application is managing that bank of memory and has all the knowledge of what is in there.  And it isn't virtual addresses from the kernel's point of view

Any pointers on where I should look for help or maybe where would be a better place to ask for help??  This is for an embedded application so I can make things work a bit different from a general purpose system if needed.

As for me: I am relatively a newbie to Linux kernel code but quite experienced in C & embedded.


Thank you,
Dan

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