From: hch@infradead.org (Christoph Hellwig)
To: linux-riscv@lists.infradead.org
Subject: [RFC PATCH 3/5] RISC-V: Add cpu_operatios structure
Date: Tue, 21 Aug 2018 23:03:53 -0700 [thread overview]
Message-ID: <20180822060353.GA27106@infradead.org> (raw)
In-Reply-To: <CAAhSdy2NP4raXXPVvEJyAO127=J9jR3NNEHLF=vigBz=v-Qqkw@mail.gmail.com>
On Tue, Aug 21, 2018 at 10:34:38PM +0530, Anup Patel wrote:
> The cpu_operations is certainly required because SOC vendors will add
> vendor-specific mechanism to selectively bringing-up CPUs/HARTs instead
> of all CPUs entering Linux kernel simultaneously. In fact, we might also end-up
> having CPU ON/OFF operations in SBI.
Your forgot an essential part in your analysis: Right now we only have
one single way to deal with cpu on/offlining, and that is the dummy WFI
kind. Once other ways show up we can build proper infrastructure, but
until then this is just a white elephant as we have no idea how these
abstractions will look like.
And my hope is that we'll just see new SBI calls, in which case we'll
just need SBI and dummy version and can avoid all the indirect calls.
next prev parent reply other threads:[~2018-08-22 6:03 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-08-15 23:56 [RFC PATCH 0/5] RISC-V: Improve smp functionality & support cpu hotplug Atish Patra
2018-08-15 23:56 ` [RFC PATCH 1/5] RISC-V: Add logical CPU indexing for RISC-V Atish Patra
2018-08-16 4:06 ` Anup Patel
2018-08-16 5:17 ` Atish Patra
2018-08-16 5:39 ` Anup Patel
2018-08-15 23:56 ` [RFC PATCH 2/5] RISC-V: Use Linux logical cpu number instead of hartid Atish Patra
2018-08-16 4:24 ` Anup Patel
2018-08-16 5:23 ` Atish Patra
2018-08-16 5:45 ` Anup Patel
2018-08-16 5:52 ` Atish Patra
2018-08-16 6:03 ` Anup Patel
2018-08-16 17:26 ` Atish Patra
2018-08-15 23:56 ` [RFC PATCH 3/5] RISC-V: Add cpu_operatios structure Atish Patra
2018-08-16 5:02 ` Anup Patel
2018-08-16 5:40 ` Atish Patra
2018-08-16 6:21 ` Anup Patel
2018-08-18 1:25 ` Atish Patra
2018-08-21 7:48 ` Christoph Hellwig
2018-08-21 17:04 ` Anup Patel
2018-08-22 6:03 ` Christoph Hellwig [this message]
2018-08-22 15:24 ` Anup Patel
2018-08-23 4:25 ` Atish Patra
2018-08-23 13:37 ` Christoph Hellwig
2018-08-23 15:15 ` Anup Patel
2018-08-22 17:16 ` Palmer Dabbelt
2018-08-15 23:56 ` [RFC PATCH 4/5] RISC-V: Move interrupt cause declarations to irq.h Atish Patra
2018-08-21 7:49 ` Christoph Hellwig
2018-08-15 23:56 ` [RFC PATCH 5/5] RISC-V: Support cpu hotplug Atish Patra
2018-08-21 7:54 ` Christoph Hellwig
2018-08-21 20:23 ` Atish Patra
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