Userspace mmap to PCI is failing

From	lex000luthor <lex000luthor@gmail.com>
Newsgroups	linux.kernel
Subject	Userspace mmap to PCI is failing
Date	2017-02-17 23:30 +0100
Message-ID	<tbZcm-1Pb-11@gated-at.bofh.it> (permalink)
Organization	linux.* mail to news gateway

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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

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Userspace mmap to PCI is failing lex000luthor <lex000luthor@gmail.com> - 2017-02-17 23:30 +0100

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