Linux-RISC-V Archive on lore.kernel.org
 help / color / Atom feed
* [RFT PATCH v1 0/4] Unify CPU topology across ARM64 & RISC-V
@ 2018-11-29 23:28 Atish Patra
  2018-11-29 23:28 ` [RFT PATCH v1 1/4] Documentation: DT: arm: add support for sockets defining package boundaries Atish Patra
                   ` (5 more replies)
  0 siblings, 6 replies; 25+ messages in thread
From: Atish Patra @ 2018-11-29 23:28 UTC (permalink / raw)
  To: linux-kernel
  Cc: Mark Rutland, Rafael J. Wysocki, Peter Zijlstra \(Intel\),
	Catalin Marinas, Palmer Dabbelt, Will Deacon, Atish Patra,
	linux-riscv, Morten Rasmussen, Juri Lelli, Dmitriy Cherkasov,
	Anup Patel, Ingo Molnar, devicetree, Albert Ou, Rob Herring,
	Thomas Gleixner, moderated list:ARM64 PORT AARCH64 ARCHITECTURE,
	Ard Biesheuvel, Greg Kroah-Hartman, Jeremy Linton, Sudeep Holla

The cpu-map DT entry in ARM64 can describe the CPU topology in
much better way compared to other existing approaches. RISC-V can
easily adopt this binding to represent it's own CPU topology.
Thus, both cpu-map DT binding and topology parsing code can be
moved to a common location so that RISC-V or any other
architecture can leverage that.

The relevant discussion regarding unifying cpu topology can be
found in [1].

arch_topology seems to be a perfect place to move the common
code. I have not introduced any functional changes in the moved
code. The only downside in this approach is that the capacity
code will be executed for RISC-V as well. But, it will exit
immediately after not able to find the appropriate DT node. If
the overhead is considered too much, we can always compile out
capacity related functions under a different config for the
architectures that do not support them.

The patches have been tested for RISC-V and compile tested for
ARM64 & x86.

The socket change[2] is also now part of this series.

[1] https://lkml.org/lkml/2018/11/6/19
[2] https://lkml.org/lkml/2018/11/7/918

QEMU changes for RISC-V topology are available at

https://github.com/atishp04/riscv-qemu/tree/cpu_topo

Apologies for the previous patch series with incorrect title and
was sent only to kernel mailing list due to a bug in my config.
Please ignore that.

Atish Patra (3):
dt-binding: cpu-topology: Move cpu-map to a common binding.
cpu-topology: Move cpu topology code to common code.
RISC-V: Parse cpu topology during boot.

Sudeep Holla (1):
Documentation: DT: arm: add support for sockets defining package
boundaries

.../{arm/topology.txt => cpu/cpu-topology.txt}     | 133 +++++++--
arch/arm64/include/asm/topology.h                  |  22 --
arch/arm64/kernel/topology.c                       | 303 +--------------------
arch/riscv/Kconfig                                 |   1 +
arch/riscv/kernel/smpboot.c                        |   3 +
drivers/base/arch_topology.c                       | 294 ++++++++++++++++++++
include/linux/arch_topology.h                      |  26 ++
include/linux/topology.h                           |   1 +
8 files changed, 435 insertions(+), 348 deletions(-)
rename Documentation/devicetree/bindings/{arm/topology.txt => cpu/cpu-topology.txt} (66%)

--
2.7.4


_______________________________________________
linux-riscv mailing list
linux-riscv@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-riscv

^ permalink raw reply	[flat|nested] 25+ messages in thread

end of thread, back to index

Thread overview: 25+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2018-11-29 23:28 [RFT PATCH v1 0/4] Unify CPU topology across ARM64 & RISC-V Atish Patra
2018-11-29 23:28 ` [RFT PATCH v1 1/4] Documentation: DT: arm: add support for sockets defining package boundaries Atish Patra
2018-12-03 16:46   ` Sudeep Holla
2018-12-12  2:18   ` Rob Herring
2018-11-29 23:28 ` [RFT PATCH v1 2/4] dt-binding: cpu-topology: Move cpu-map to a common binding Atish Patra
2018-12-03 16:55   ` Sudeep Holla
2018-12-03 17:23     ` Atish Patra
2018-12-03 17:33       ` Sudeep Holla
2018-12-03 17:40         ` Atish Patra
2018-12-12  2:21       ` Rob Herring
2018-12-12  2:31   ` Rob Herring
2018-12-12 18:23     ` Atish Patra
2018-11-29 23:28 ` [RFT PATCH v1 3/4] cpu-topology: Move cpu topology code to common code Atish Patra
2018-12-03 16:58   ` Will Deacon
2018-12-03 17:12     ` Sudeep Holla
2018-12-04  9:50       ` Juri Lelli
2018-12-03 17:16   ` Sudeep Holla
2018-12-03 17:31     ` Atish Patra
2018-11-29 23:28 ` [RFT PATCH v1 4/4] RISC-V: Parse cpu topology during boot Atish Patra
2018-12-03 16:59   ` Sudeep Holla
2018-12-05 17:53 ` [RFT PATCH v1 0/4] Unify CPU topology across ARM64 & RISC-V Jeffrey Hugo
2018-12-11  0:26   ` Atish Patra
2018-12-07 13:45 ` Morten Rasmussen
2018-12-07 15:04   ` Sudeep Holla
2018-12-11  0:11   ` Atish Patra

Linux-RISC-V Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/linux-riscv/0 linux-riscv/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 linux-riscv linux-riscv/ https://lore.kernel.org/linux-riscv \
		linux-riscv@lists.infradead.org infradead-linux-riscv@archiver.kernel.org
	public-inbox-index linux-riscv


Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.infradead.lists.linux-riscv


AGPL code for this site: git clone https://public-inbox.org/ public-inbox