From: Arnd Bergmann <arnd@arndb.de>
To: linux-arm-kernel@lists.infradead.org
Cc: Gabriele Paoloni <gabriele.paoloni@huawei.com>,
"mark.rutland@arm.com" <mark.rutland@arm.com>,
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Thomas Petazzoni <thomas.petazzoni@free-electrons.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Yuanzhichang <yuanzhichang@hisilicon.com>,
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Subject: Re: [PATCH V5 3/3] ARM64 LPC: LPC driver implementation on Hip06
Date: Fri, 18 Nov 2016 14:42:38 +0100 [thread overview]
Message-ID: <2271602.GoSoby0zHK@wuerfel> (raw)
In-Reply-To: <EE11001F9E5DDD47B7634E2F8A612F2E1F921283@lhreml507-mbx>
On Friday, November 18, 2016 12:53:08 PM CET Gabriele Paoloni wrote:
> From: Arnd Bergmann [mailto:arnd@arndb.de]
> > On Friday, November 18, 2016 12:07:28 PM CET Gabriele Paoloni wrote:
> > > > I think there is no need to change a) here, we have PCIBIOS_MIN_IO
> > > > today and even if we don't need it, there is no obvious downside.
> > > > I would also argue that we can ignore b) for the discussion of
> > > > the HiSilicon LPC driver, we just need to assign some range
> > > > of logical addresses to each domain.
> > > >
> > > > That means solving c) is the important problem here, and it
> > > > shouldn't be so hard. We can do this either with a single
> > > > special domain as in the v5 patch series, or by generalizing it
> > > > so that any I/O space mapping gets looked up through the device
> > > > pointer of the bus master.
> > >
> > > I am not very on the "generalized" multi-domain solution...
> > > Currently the IO accessors prototypes have an unsigned long addr
> > > as input parameter. If we live in a multi-domain IO system
> > > how can we distinguish inside the accessor which domain addr
> > > belongs to?
> >
> > The easiest change compared to the v5 code would be to walk
> > a linked list of 'struct extio_ops' structures rather than
> > assuming there is only ever one of them. I think one of the
> > earlier versions actually did this.
>
> Right but if my understanding is correct if we live in a multi-
> domain I/O space world when you have an input addr in the I/O
> accessors this addr can be duplicated (for example for the standard
> PCI IO domain and for our special LPC domain).
> So effectively even if you walk a linked list there is a problem
> of disambiguation...am I right?
No, unlike the PCI memory space, the PIO addresses are not
usually distinct, i.e. every PCI bus has its own 64K I/O
addresses starting at zero. We linearize them into the
Linux I/O space using the per-domain io_offset value.
For the ISA/LPC spaces there are only 4k of addresses, they
the bus addresses always overlap, but we can trivially
figure out the bus address from Linux I/O port number
by subtracting the start of the range.
> > Another option the IA64 approach mentioned in another subthread
> > today, looking up the operations based on an index from the
> > upper bits of the port number. If we do this, we probably
> > want to do that for all PIO access and replace the entire
> > virtual address remapping logic with that. I think Bjorn
> > in the past argued in favor of such an approach, while I
> > advocated the current scheme for simplicity based on how
> > every I/O space these days is just memory mapped (which now
> > turned out to be false, both on powerpc and arm64).
>
> This seems really complex...I am a bit worried that possibly
> we end up in having the maintainers saying that it is not worth
> to re-invent the world just for this special LPC device...
It would clearly be a rather invasive change, but the
end-result isn't necessarily more complex than what we
have today, as we'd kill off the crazy pci_pio_to_address()
and pci_address_to_pio() hacks in address translation.
> To be honest with you I would keep things simple for this
> LPC and introduce more complex reworks later if more devices
> need to be introduced.
>
> What if we stick on a single domain now where we introduce a
> reserved threshold for the IO space (say INDIRECT_MAX_IO).
I said having a single domain is fine, but I still don't
like the idea of reserving low port numbers for this hack,
it would mean that the numbers change for everyone else.
> We define INDIRECT_MAX_IO as 0 in "include/linux/extio.h" and
> we define INDIRECT_MAX_IO as 0x1000 in "arch/arm64/include/asm/io.h"
>
> So effectively this threshold can change according to the
> architecture and so far we only define it for ARM64 as we need
> it for ARM64...
I liked the idea of having it done in asm-generic/io.h (in an ifdef)
and lib/*.c under an as someone suggested earlier. There is nothing
ARM64 specific in the implementation.
Arnd
next prev parent reply other threads:[~2016-11-18 13:43 UTC|newest]
Thread overview: 83+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-11-08 3:47 [PATCH V5 0/3] ARM64 LPC: legacy ISA I/O support zhichang.yuan
2016-11-08 3:47 ` [PATCH V5 1/3] ARM64 LPC: Indirect ISA port IO introduced zhichang.yuan
2016-11-08 12:03 ` Mark Rutland
2016-11-08 16:09 ` Arnd Bergmann
2016-11-08 16:15 ` Arnd Bergmann
2016-11-08 23:16 ` Benjamin Herrenschmidt
2016-11-10 8:33 ` zhichang.yuan
2016-11-10 11:22 ` Mark Rutland
2016-11-10 19:32 ` Benjamin Herrenschmidt
2016-11-11 10:07 ` zhichang.yuan
2016-11-18 9:20 ` Arnd Bergmann
2016-11-18 11:12 ` zhichang.yuan
2016-11-18 11:38 ` Arnd Bergmann
2016-11-21 12:58 ` John Garry
2016-11-08 16:12 ` Will Deacon
2016-11-08 16:33 ` John Garry
2016-11-08 16:49 ` Will Deacon
2016-11-08 17:05 ` John Garry
2016-11-08 22:35 ` Arnd Bergmann
2016-11-09 11:29 ` John Garry
2016-11-09 21:33 ` Arnd Bergmann
2016-12-22 8:15 ` Ming Lei
2016-12-23 1:43 ` zhichang.yuan
2016-12-23 7:24 ` Ming Lei
2017-01-06 11:43 ` Arnd Bergmann
2016-11-08 3:47 ` [PATCH V5 2/3] ARM64 LPC: Add missing range exception for special ISA zhichang.yuan
2016-11-08 5:17 ` kbuild test robot
2016-11-08 5:27 ` kbuild test robot
2016-11-08 11:49 ` Mark Rutland
2016-11-08 16:19 ` Arnd Bergmann
2016-11-08 17:10 ` Mark Rutland
2016-11-09 13:54 ` One Thousand Gnomes
2016-11-09 14:51 ` Gabriele Paoloni
2016-11-09 21:38 ` Arnd Bergmann
2016-11-14 11:11 ` One Thousand Gnomes
2016-11-18 9:22 ` Arnd Bergmann
2016-11-08 23:12 ` Benjamin Herrenschmidt
2016-11-09 11:20 ` Mark Rutland
2016-11-10 7:08 ` Benjamin Herrenschmidt
2016-11-09 11:39 ` liviu.dudau
2016-11-09 16:16 ` Gabriele Paoloni
2016-11-09 16:50 ` liviu.dudau
2016-11-10 6:24 ` zhichang.yuan
2016-11-10 16:06 ` Gabriele Paoloni
2016-11-11 10:37 ` liviu.dudau
2016-11-08 3:47 ` [PATCH V5 3/3] ARM64 LPC: LPC driver implementation on Hip06 zhichang.yuan
2016-11-08 6:11 ` kbuild test robot
2016-11-08 16:24 ` Arnd Bergmann
2016-11-09 12:10 ` Gabriele Paoloni
2016-11-09 21:34 ` Arnd Bergmann
2016-11-10 6:40 ` zhichang.yuan
2016-11-10 9:12 ` Arnd Bergmann
2016-11-10 12:36 ` zhichang.yuan
2016-11-18 11:46 ` Arnd Bergmann
2016-11-10 15:36 ` Gabriele Paoloni
2016-11-10 16:07 ` Arnd Bergmann
2016-11-11 10:09 ` zhichang.yuan
2016-11-11 10:48 ` liviu.dudau
2016-11-11 13:39 ` Gabriele Paoloni
2016-11-11 14:45 ` liviu.dudau
2016-11-11 15:53 ` Gabriele Paoloni
2016-11-11 18:16 ` liviu.dudau
2016-11-14 8:26 ` Gabriele Paoloni
2016-11-14 11:26 ` liviu.dudau
2016-11-18 10:17 ` Arnd Bergmann
2016-11-18 12:07 ` Gabriele Paoloni
2016-11-18 12:24 ` Arnd Bergmann
2016-11-18 12:53 ` Gabriele Paoloni
2016-11-18 13:42 ` Arnd Bergmann [this message]
2016-11-18 16:18 ` Gabriele Paoloni
2016-11-18 16:34 ` Arnd Bergmann
2016-11-18 17:03 ` Gabriele Paoloni
2016-11-23 14:16 ` Arnd Bergmann
2016-11-23 15:22 ` Gabriele Paoloni
2016-11-23 17:07 ` Arnd Bergmann
2016-11-23 23:23 ` Arnd Bergmann
2016-11-24 9:12 ` zhichang.yuan
2016-11-24 10:24 ` Arnd Bergmann
2016-11-25 8:46 ` Gabriele Paoloni
2016-11-25 12:03 ` Arnd Bergmann
2016-11-25 16:27 ` Gabriele Paoloni
2016-11-11 16:54 ` zhichang.yuan
2016-11-14 11:06 ` One Thousand Gnomes
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