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From: General Schvantzkoph <schvantzkoph@yahoo.com>
Newsgroups: comp.os.linux.hardware,comp.arch.fpga
Subject: Re: Is there a utility to peek and poke PCIe devices
Date: 11 Aug 2011 13:21:16 GMT
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On Thu, 11 Aug 2011 08:57:05 +0200, rndhro wrote:

> On 08/10/11 23:39, General Schvantzkoph wrote:
>> Is there a utility that does peeks and pokes to PCIe devices. I'm
>> developing an FPGA with a PCIe interface and I'd like to do some simple
>> memory accesses before I move on to the more complicated things like
>> DMA. We have a driver in development but I think there is a standard
>> Altera driver already in the kernel which I assume would be good enough
>> for simple accesses.
>> 
>> I'm running on Scientific Linux 6.1.
>> 
>> lspci identifies the device as an Altera device which is correct.
>> 
>> 01:00.0 Unassigned class [ff00]: Altera Corporation Device 0004 (rev
>> 01)
> 
> you don't even need a driver for simple memory access. if your device is
> detected by the kernel you can directly access the BARs via sysfs: # ls
> -l /sys/bus/pci/devices/0000\:01\:00.0/ [...]
> -rw------- 1 root root 256M Aug 11 08:51 resource0 -rw------- 1 root
> root  256 Aug 11 08:51 resource1 -rw------- 1 root root  64K Aug  2
> 08:14 resource2 [...]
> 
> This is an example of a device with 3 BARs. These files can be
> read/written/mmapped... you could use "dd" or write a little C program
> to mmap the files.
> 
> HTH

How do I determine which device is mine?

Here is the lspci output
01:00.0 Unassigned class [ff00]: Altera Corporation Device 0004 (rev 01)

Here are the devices under /sys/bus/pci_express/devices

0000:00:0b.0:pcie01/	0000:00:0c.0:pcie01/	0000:00:0d.0:pcie01/	
0000:00:0e.0:pcie01/
0000:00:0b.0:pcie08/	0000:00:0c.0:pcie08/	0000:00:0d.0:pcie08/	
0000:00:0e.0:pcie08

Here are the devices under /sys/bus/pci/devices

0000:00:00.0/	0000:00:02.0/	0000:00:06.0/	0000:00:09.0/	
0000:00:0c.0/	0000:00:18.0/	0000:00:18.3/	0000:05:00.0/
0000:00:01.0/	0000:00:02.1/	0000:00:07.0/	0000:00:0a.0/	
0000:00:0d.0/	0000:00:18.1/	0000:01:0d.0/
0000:00:01.1/	0000:00:04.0/	0000:00:08.0/	0000:00:0b.0/	
0000:00:0e.0/	0000:00:18.2/	0000:03:00.0