linux-kernel - Userspace mmap to PCI is failing

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Date:   Fri, 17 Feb 2017 14:21:32 -0800
From:   lex000luthor <lex000luthor@...il.com>
To:     linux-kernel@...r.kernel.org
Subject: Userspace mmap to PCI is failing

Hello,

I am trying to mmap a PCI device, but it fails with EINVAL.

<snip>
...
fd = open("/dev/mem", O_RDWR | O_SYNC);
...
rv = mmap64(0, size, PROT_READ, MAP_SHARED, fd, pci_addr);
...
<snip>

The pci_addr is the address obtained from lspci output which is a 64 bit
address.
The pci_addr has a value of 0x121ffb000000, is that weird?

Kernel is 3.4.10 64 bit and User space is 32 bit.

regards,
Lex