From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Atish Patra <atish.patra@wdc.com>,
ron minnich <rminnich@gmail.com>,
Luke Kenneth Casson Leighton <lkcl@lkcl.net>
Cc: "mark.rutland@arm.com" <mark.rutland@arm.com>,
Christoph Hellwig <hch@infradead.org>,
Damien Le Moal <Damien.LeMoal@wdc.com>,
Olof Johansson <olof.johansson@gmail.com>,
"alankao@andestech.com" <alankao@andestech.com>,
"abner.chang@hpe.com" <abner.chang@hpe.com>,
Anup Patel <anup@brainfault.org>,
Palmer Dabbelt <palmer@sifive.com>,
"agraf@suse.de" <agraf@suse.de>,
"zong@andestech.com" <zong@andestech.com>,
Alistair Francis <Alistair.Francis@wdc.com>,
Paul Walmsley <paul.walmsley@sifive.com>,
"mick@ics.forth.gr" <mick@ics.forth.gr>,
"sw-dev@groups.riscv.org" <sw-dev@groups.riscv.org>,
"linux-riscv@lists.infradead.org"
<linux-riscv@lists.infradead.org>,
Andrew Waterman <andrew@sifive.com>
Subject: Re: [sw-dev] SBI extension proposal v2
Date: Sun, 02 Dec 2018 17:18:54 +1100 [thread overview]
Message-ID: <d476c0e2b525fb0642b3155a247495cb1850c208.camel@kernel.crashing.org> (raw)
In-Reply-To: <7efecac7-17bd-5fc1-d0de-9fd498db4751@wdc.com>
On Sat, 2018-11-10 at 19:58 -0800, Atish Patra wrote:
>
> I think the larger picture might have lost somewhere because of the
> verbosity of the proposal. The idea of adding vendor extension support
> in SBI is to allow them provide a standard mechanism to facilitate this.
> In absence of that, vendor might adopt different approaches to support
> their feature leading a lot of chaos. Vendors can not go and add
> anything in the Linux kernel(just a example, SBI is still OS agnostic)
> as well.
The concept of vendor extensions to a userspace ISA is so fundamentally
broken to begin with, this FW proposal verges on utter insanity to be
honest.
Calling FW for things so deeply ingrained in the kernel such as context
swithes, isn't going to fly. The performance will be ridiculously bad,
among other things.
If Risc-V wants to avoid fragmentation, it should simply keep a firmer
reign in what is allowed in an implementation and keep a lid on such
horrid ideas as vendor specific userspace ISA extensions.
Cheers,
Ben.
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next prev parent reply other threads:[~2019-01-28 12:10 UTC|newest]
Thread overview: 100+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-11-10 2:42 SBI extension proposal v2 Atish Patra
2018-11-10 2:42 ` Atish Patra
2018-11-10 5:12 ` [sw-dev] " Luke Kenneth Casson Leighton
2018-11-10 5:12 ` Luke Kenneth Casson Leighton
2018-11-10 14:50 ` Nick Kossifidis
2018-11-10 14:50 ` Nick Kossifidis
2018-11-10 15:48 ` Luke Kenneth Casson Leighton
2018-11-10 15:48 ` Luke Kenneth Casson Leighton
2018-11-10 16:46 ` ron minnich
2018-11-10 16:46 ` ron minnich
2018-11-10 17:40 ` Luke Kenneth Casson Leighton
2018-11-10 17:40 ` Luke Kenneth Casson Leighton
2018-11-10 17:41 ` Samuel Falvo II
2018-11-10 17:41 ` Samuel Falvo II
2018-11-10 17:42 ` Luke Kenneth Casson Leighton
2018-11-10 17:42 ` Luke Kenneth Casson Leighton
2018-11-10 17:51 ` Samuel Falvo II
2018-11-10 17:51 ` Samuel Falvo II
2018-11-10 17:55 ` Luke Kenneth Casson Leighton
2018-11-10 17:55 ` Luke Kenneth Casson Leighton
2018-11-10 18:03 ` Samuel Falvo II
2018-11-10 18:03 ` Samuel Falvo II
2018-11-10 17:43 ` Samuel Falvo II
2018-11-10 17:43 ` Samuel Falvo II
2018-11-10 17:41 ` Olof Johansson
2018-11-10 17:41 ` Olof Johansson
2018-11-10 17:47 ` Luke Kenneth Casson Leighton
2018-11-10 17:47 ` Luke Kenneth Casson Leighton
2018-11-10 17:59 ` Nick Kossifidis
2018-11-10 17:59 ` Nick Kossifidis
2018-11-10 18:01 ` ron minnich
2018-11-10 18:01 ` ron minnich
2018-11-10 19:33 ` Luke Kenneth Casson Leighton
2018-11-10 19:33 ` Luke Kenneth Casson Leighton
2018-11-10 19:39 ` Luke Kenneth Casson Leighton
2018-11-10 19:39 ` Luke Kenneth Casson Leighton
2018-11-11 3:15 ` Nick Kossifidis
2018-11-11 3:15 ` Nick Kossifidis
2018-11-11 7:14 ` Luke Kenneth Casson Leighton
2018-11-11 7:14 ` Luke Kenneth Casson Leighton
2018-11-11 13:17 ` Nick Kossifidis
2018-11-11 13:17 ` Nick Kossifidis
2018-11-12 2:08 ` Palmer Dabbelt
2018-11-12 2:08 ` Palmer Dabbelt
2018-11-10 18:02 ` Olof Johansson
2018-11-10 18:02 ` Olof Johansson
2018-11-10 19:34 ` Luke Kenneth Casson Leighton
2018-11-10 19:34 ` Luke Kenneth Casson Leighton
2018-11-13 1:22 ` Michael Clark
2018-11-13 1:22 ` Michael Clark
2018-11-10 17:54 ` Nick Kossifidis
2018-11-10 17:54 ` Nick Kossifidis
2018-11-10 17:59 ` ron minnich
2018-11-10 17:59 ` ron minnich
2018-11-11 3:58 ` Atish Patra
2018-11-11 3:58 ` Atish Patra
2018-12-02 6:18 ` Benjamin Herrenschmidt [this message]
2019-01-28 12:31 ` Alexander Graf
2019-01-28 16:33 ` Luke Kenneth Casson Leighton
2019-01-28 16:38 ` Alexander Graf
2019-01-28 16:47 ` Nick Kossifidis
2019-01-28 19:43 ` Alexander Graf
2019-01-28 19:47 ` Atish Patra
2019-01-28 19:48 ` Alexander Graf
2019-01-28 19:40 ` ron minnich
2019-01-28 19:55 ` Alexander Graf
2019-01-28 20:18 ` ron minnich
2019-01-28 20:37 ` Alexander Graf
2019-01-28 22:23 ` ron minnich
2019-01-29 8:53 ` Alexander Graf
2019-01-29 15:52 ` ron minnich
2019-01-28 23:46 ` Luke Kenneth Casson Leighton
2019-01-28 23:22 ` Bruce Hoult
2019-01-29 0:03 ` Luke Kenneth Casson Leighton
2019-01-29 4:28 ` ron minnich
[not found] ` <CANs6eMk4z-ZibLW_5o03onu8AQe23uMa2hSieceHFqKS7igLDQ@mail.gmail.com>
2019-01-30 0:05 ` Luke Kenneth Casson Leighton
2019-01-30 0:17 ` ron minnich
2019-01-30 0:49 ` Bruce Hoult
2019-01-30 3:15 ` Luke Kenneth Casson Leighton
[not found] ` <09bede45-6ecf-4ded-8615-0be38aac33fc@groups.riscv.org>
2019-01-29 3:58 ` Samuel Falvo II
2019-01-29 4:33 ` ron minnich
2019-02-05 22:29 ` Benjamin Herrenschmidt
2019-02-05 23:02 ` Luís Marques
2019-02-06 7:03 ` ron minnich
2019-02-06 7:54 ` Damien Le Moal
2019-02-07 3:56 ` Paul Walmsley
2019-02-07 7:17 ` Anup Patel
2019-02-07 7:19 ` Anup Patel
2019-01-29 22:41 ` Palmer Dabbelt
2018-11-10 17:43 ` Nick Kossifidis
2018-11-10 17:43 ` Nick Kossifidis
2018-11-10 17:51 ` Luke Kenneth Casson Leighton
2018-11-10 17:51 ` Luke Kenneth Casson Leighton
2018-11-10 5:36 ` David Abdurachmanov
2018-11-10 5:36 ` David Abdurachmanov
[not found] ` <CA++6G0BTdybjhqaXm9EhAz0HsgpwfozK6OEL7DuzbS48RbEChA@mail.gmail.com>
2018-11-10 15:09 ` Nick Kossifidis
2018-11-10 15:09 ` Nick Kossifidis
2018-11-12 4:33 ` Nick Kossifidis
2018-11-12 4:33 ` Nick Kossifidis
2018-12-04 23:22 ` [sw-dev] " Atish Patra
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