linux-kernel - [PATCH v1 0/9] RISC-V: Probe DT extension support using riscv,isa-extensions & riscv,isa-base

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Date:   Mon, 26 Jun 2023 12:19:38 +0100
From:   Conor Dooley <conor.dooley@...rochip.com>
To:     <palmer@...belt.com>
CC:     <conor@...nel.org>, <conor.dooley@...rochip.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Andrew Jones <ajones@...tanamicro.com>,
        Heiko Stuebner <heiko.stuebner@...ll.eu>,
        "Evan Green" <evan@...osinc.com>,
        Sunil V L <sunilvl@...tanamicro.com>,
        <linux-riscv@...ts.infradead.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: [PATCH v1 0/9] RISC-V: Probe DT extension support using riscv,isa-extensions & riscv,isa-base

Hey,

Based on my latest iteration of deprecating riscv,isa [1], here's an
implementation of the new properties for Linux. The first few patches,
up to "RISC-V: split riscv_fill_hwcap() in 3", are all prep work that
further tames some of the extension related code, on top of my already
applied series that cleans up the ISA string parser.
Perhaps "RISC-V: shunt isa_ext_arr to cpufeature.c" is a bit gratuitous,
but I figured a bit of coalescing of extension related data structures
would be a good idea. I certainly would not be against putting this
stuff in hwcap.h instead.

Note that riscv,isa will still be used in the absence of the new
properties:
	if (!acpi_disabled) {
		riscv_fill_hwcap_from_isa_string(isa2hwcap);
	} else {
		int ret = riscv_fill_hwcap_new(isa2hwcap);
		if (ret) {
			pr_info("Falling back to deprecated \"riscv,isa\"\n");
			riscv_fill_hwcap_from_isa_string(isa2hwcap);
		}
	}

Also, I could not come up with a good name for the new function,
suggestions welcome on that front for sure.

Cheers,
Conor.

As a side note, I tried some macro fiddling to remove the need for a
\#define for each extension that ends up conflicting a bunch between
different people, but didn't come up with anything I was happy with that
worked. I'll keep tinkering with that.

[1] https://lore.kernel.org/all/20230626-unmarked-atom-70b4d624a386@wendy/

CC: Rob Herring <robh+dt@...nel.org>
CC: Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>
CC: Paul Walmsley <paul.walmsley@...ive.com>
CC: Palmer Dabbelt <palmer@...belt.com>
CC: Albert Ou <aou@...s.berkeley.edu>
CC: Andrew Jones <ajones@...tanamicro.com>
CC: Heiko Stuebner <heiko.stuebner@...ll.eu>
CC: Evan Green <evan@...osinc.com>
CC: Sunil V L <sunilvl@...tanamicro.com>
CC: linux-riscv@...ts.infradead.org
CC: devicetree@...r.kernel.org
CC: linux-kernel@...r.kernel.org

Conor Dooley (8):
  RISC-V: drop a needless check in print_isa_ext()
  RISC-V: shunt isa_ext_arr to cpufeature.c
  RISC-V: repurpose riscv_isa_ext array in riscv_fill_hwcap()
  RISC-V: add missing single letter extension definitions
  RISC-V: add single letter extensions to riscv_isa_ext
  RISC-V: split riscv_fill_hwcap() in 3
  RISC-V: enable extension detection from new properties
  RISC-V: try new extension properties in of_early_processor_hartid()

Heiko Stuebner (1):
  RISC-V: don't parse dt/acpi isa string to get rv32/rv64

 arch/riscv/include/asm/hwcap.h |  16 +-
 arch/riscv/kernel/cpu.c        | 149 +++-------
 arch/riscv/kernel/cpufeature.c | 508 +++++++++++++++++++++------------
 3 files changed, 379 insertions(+), 294 deletions(-)

-- 
2.40.1