From: Joakim Tjernlund <Joakim.Tjernlund@infinera.com>
To: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"gregkh@linuxfoundation.org" <gregkh@linuxfoundation.org>
Subject: uio_dmem_genirq.c and DMA mapping to user space ?
Date: Tue, 12 Sep 2017 12:18:27 +0000 [thread overview]
Message-ID: <1505218705.31322.108.camel@infinera.com> (raw)
Hi
I am trying to use the uio_dmem_genirq.c driver for allocating DMA memory to a PCI device
using the uio_pci_generic.c driver.
I got as far as defining an UIO dev containing only Dynamic DMA memory and
now I am stuck.
I can see how DMA memory is allocated when opening the /dev/uio device but I cannot
figure out how to mmap this memory to User space as well so I can share this
memory with the PCI device and my user space driver.
What am I missing?
Jocke
next reply other threads:[~2017-09-12 12:18 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-09-12 12:18 Joakim Tjernlund [this message]
2017-09-12 12:37 ` uio_dmem_genirq.c and DMA mapping to user space ? gregkh
2017-09-12 14:08 ` Joakim Tjernlund
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