Date: Tue, 31 Jul 2012 12:22:55 -0400 From: John Baldwin <jhb@freebsd.org> To: Adrian Chadd <adrian@freebsd.org> Cc: freebsd-net@freebsd.org, Venkat Duvvuru <venkatduvvuru.ml@gmail.com> Subject: Re: PCI BAR mmap Message-ID: <201207311222.55618.jhb@freebsd.org> In-Reply-To: <CAJ-VmokHYE_jT8i4B-m1Mz3aG60FyWLa7jHgsdXUwWz3qsPsjw@mail.gmail.com> References: <CAGdae7a0xuKnFaeOTUykLcUKuCf17TTuYD_MuG4t7FKbHNoqAg@mail.gmail.com> <CAGdae7aw0M_BNy2ozbPhznC7vuw-5%2BbxqJVx%2BJBnhzG4TnKsYg@mail.gmail.com> <CAJ-VmokHYE_jT8i4B-m1Mz3aG60FyWLa7jHgsdXUwWz3qsPsjw@mail.gmail.com>
next in thread | previous in thread | raw e-mail | index | archive | help
On Tuesday, July 31, 2012 12:14:41 pm Adrian Chadd wrote: > On 31 July 2012 08:22, Venkat Duvvuru <venkatduvvuru.ml@gmail.com> wrote: > > Hi John, > > Thanks for your response. > > Is there an alternative to mmap the PCI BARs, I mean without implementing > > an mmap method in the driver, something like a pci subsystem mmap in Linux. > > Linux allows to mmap PCI BARs without any change in the device driver. > > I guess someone could implement a sysctl API to access PCI BAR > registers, rather than mapping /dev/pci or however pciconf -r works. > > That way you'd implement it once and all devices would have their BAR > registers show up in a userland-friendly way. Eh, no sysctl. /dev/pci uses ioctls. However, having a generic way to mmap BARs may be useful. -- John Baldwin
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?201207311222.55618.jhb>