| Message ID | 20230922081351.30239-8-conor@kernel.org (mailing list archive) |
|---|---|
| State | Superseded |
| Commit | 0804f3bec9e9a3e9f3b5431ac9a11417041bc4c2 |
| Delegated to: | Geert Uytterhoeven |
| Headers | show |
| Series | riscv,isa-extensions additions | expand |
On Fri, Sep 22, 2023 at 4:16 PM Conor Dooley <conor@kernel.org> wrote: > > From: Conor Dooley <conor.dooley@microchip.com> > > Convert the th1520 devicetrees to use the new properties > "riscv,isa-base" & "riscv,isa-extensions". > For compatibility with other projects, "riscv,isa" remains. > > Signed-off-by: Conor Dooley <conor.dooley@microchip.com> > --- > arch/riscv/boot/dts/thead/th1520.dtsi | 12 ++++++++++++ > 1 file changed, 12 insertions(+) > > diff --git a/arch/riscv/boot/dts/thead/th1520.dtsi b/arch/riscv/boot/dts/thead/th1520.dtsi > index ce708183b6f6..723f65487246 100644 > --- a/arch/riscv/boot/dts/thead/th1520.dtsi > +++ b/arch/riscv/boot/dts/thead/th1520.dtsi > @@ -20,6 +20,9 @@ c910_0: cpu@0 { > compatible = "thead,c910", "riscv"; > device_type = "cpu"; > riscv,isa = "rv64imafdc"; > + riscv,isa-base = "rv64i"; Why not riscv,isa-base = "rv64"? I saw "i" in the riscv,isa-extensions. Maybe this question should be in this mailing thread and a little late: https://lore.kernel.org/linux-riscv/20230713-tablet-jimmy-987fea0eb2e1@wendy/ > + riscv,isa-extensions = "i", "m", "a", "f", "d", "c", "zicntr", "zicsr", > + "zifencei", "zihpm"; > reg = <0>; > i-cache-block-size = <64>; > i-cache-size = <65536>; > @@ -41,6 +44,9 @@ c910_1: cpu@1 { > compatible = "thead,c910", "riscv"; > device_type = "cpu"; > riscv,isa = "rv64imafdc"; > + riscv,isa-base = "rv64i"; > + riscv,isa-extensions = "i", "m", "a", "f", "d", "c", "zicntr", "zicsr", > + "zifencei", "zihpm"; > reg = <1>; > i-cache-block-size = <64>; > i-cache-size = <65536>; > @@ -62,6 +68,9 @@ c910_2: cpu@2 { > compatible = "thead,c910", "riscv"; > device_type = "cpu"; > riscv,isa = "rv64imafdc"; > + riscv,isa-base = "rv64i"; > + riscv,isa-extensions = "i", "m", "a", "f", "d", "c", "zicntr", "zicsr", > + "zifencei", "zihpm"; > reg = <2>; > i-cache-block-size = <64>; > i-cache-size = <65536>; > @@ -83,6 +92,9 @@ c910_3: cpu@3 { > compatible = "thead,c910", "riscv"; > device_type = "cpu"; > riscv,isa = "rv64imafdc"; > + riscv,isa-base = "rv64i"; > + riscv,isa-extensions = "i", "m", "a", "f", "d", "c", "zicntr", "zicsr", > + "zifencei", "zihpm"; > reg = <3>; > i-cache-block-size = <64>; > i-cache-size = <65536>; > -- > 2.41.0 > -- Best Regards Guo Ren
On Sat, Sep 23, 2023 at 03:50:36PM +0800, Guo Ren wrote: > On Fri, Sep 22, 2023 at 4:16 PM Conor Dooley <conor@kernel.org> wrote: > > > > From: Conor Dooley <conor.dooley@microchip.com> > > > > Convert the th1520 devicetrees to use the new properties > > "riscv,isa-base" & "riscv,isa-extensions". > > For compatibility with other projects, "riscv,isa" remains. > > > > Signed-off-by: Conor Dooley <conor.dooley@microchip.com> > > --- > > arch/riscv/boot/dts/thead/th1520.dtsi | 12 ++++++++++++ > > 1 file changed, 12 insertions(+) > > > > diff --git a/arch/riscv/boot/dts/thead/th1520.dtsi b/arch/riscv/boot/dts/thead/th1520.dtsi > > index ce708183b6f6..723f65487246 100644 > > --- a/arch/riscv/boot/dts/thead/th1520.dtsi > > +++ b/arch/riscv/boot/dts/thead/th1520.dtsi > > @@ -20,6 +20,9 @@ c910_0: cpu@0 { > > compatible = "thead,c910", "riscv"; > > device_type = "cpu"; > > riscv,isa = "rv64imafdc"; > > + riscv,isa-base = "rv64i"; > Why not riscv,isa-base = "rv64"? I saw "i" in the riscv,isa-extensions. I did it that way as a hedge against things changing in the future. I have little trust in that part of the ISA specifications.
在 2023-09-22星期五的 09:13 +0100，Conor Dooley写道： > From: Conor Dooley <conor.dooley@microchip.com> > > Convert the th1520 devicetrees to use the new properties > "riscv,isa-base" & "riscv,isa-extensions". > For compatibility with other projects, "riscv,isa" remains. > > Signed-off-by: Conor Dooley <conor.dooley@microchip.com> > --- > arch/riscv/boot/dts/thead/th1520.dtsi | 12 ++++++++++++ > 1 file changed, 12 insertions(+) > > diff --git a/arch/riscv/boot/dts/thead/th1520.dtsi > b/arch/riscv/boot/dts/thead/th1520.dtsi > index ce708183b6f6..723f65487246 100644 > --- a/arch/riscv/boot/dts/thead/th1520.dtsi > +++ b/arch/riscv/boot/dts/thead/th1520.dtsi > @@ -20,6 +20,9 @@ c910_0: cpu@0 { > compatible = "thead,c910", "riscv"; > device_type = "cpu"; > riscv,isa = "rv64imafdc"; > + riscv,isa-base = "rv64i"; > + riscv,isa-extensions = "i", "m", "a", "f", > "d", "c", "zicntr", "zicsr", > + "zifencei", "zihpm"; Zfh is supported by T-Head C9xx with float too. In addition, should X extensions get listed here? > reg = <0>; > i-cache-block-size = <64>; > i-cache-size = <65536>; > @@ -41,6 +44,9 @@ c910_1: cpu@1 { > compatible = "thead,c910", "riscv"; > device_type = "cpu"; > riscv,isa = "rv64imafdc"; > + riscv,isa-base = "rv64i"; > + riscv,isa-extensions = "i", "m", "a", "f", > "d", "c", "zicntr", "zicsr", > + "zifencei", "zihpm"; > reg = <1>; > i-cache-block-size = <64>; > i-cache-size = <65536>; > @@ -62,6 +68,9 @@ c910_2: cpu@2 { > compatible = "thead,c910", "riscv"; > device_type = "cpu"; > riscv,isa = "rv64imafdc"; > + riscv,isa-base = "rv64i"; > + riscv,isa-extensions = "i", "m", "a", "f", > "d", "c", "zicntr", "zicsr", > + "zifencei", "zihpm"; > reg = <2>; > i-cache-block-size = <64>; > i-cache-size = <65536>; > @@ -83,6 +92,9 @@ c910_3: cpu@3 { > compatible = "thead,c910", "riscv"; > device_type = "cpu"; > riscv,isa = "rv64imafdc"; > + riscv,isa-base = "rv64i"; > + riscv,isa-extensions = "i", "m", "a", "f", > "d", "c", "zicntr", "zicsr", > + "zifencei", "zihpm"; > reg = <3>; > i-cache-block-size = <64>; > i-cache-size = <65536>;
On Sun, Sep 24, 2023 at 07:22:30AM +0800, Icenowy Zheng wrote: > 在 2023-09-22星期五的 09:13 +0100，Conor Dooley写道： > > From: Conor Dooley <conor.dooley@microchip.com> > > > > Convert the th1520 devicetrees to use the new properties > > "riscv,isa-base" & "riscv,isa-extensions". > > For compatibility with other projects, "riscv,isa" remains. > > > > Signed-off-by: Conor Dooley <conor.dooley@microchip.com> > > --- > > arch/riscv/boot/dts/thead/th1520.dtsi | 12 ++++++++++++ > > 1 file changed, 12 insertions(+) > > > > diff --git a/arch/riscv/boot/dts/thead/th1520.dtsi > > b/arch/riscv/boot/dts/thead/th1520.dtsi > > index ce708183b6f6..723f65487246 100644 > > --- a/arch/riscv/boot/dts/thead/th1520.dtsi > > +++ b/arch/riscv/boot/dts/thead/th1520.dtsi > > @@ -20,6 +20,9 @@ c910_0: cpu@0 { > > compatible = "thead,c910", "riscv"; > > device_type = "cpu"; > > riscv,isa = "rv64imafdc"; > > + riscv,isa-base = "rv64i"; > > + riscv,isa-extensions = "i", "m", "a", "f", > > "d", "c", "zicntr", "zicsr", > > + "zifencei", "zihpm"; > > Zfh is supported by T-Head C9xx with float too. You say xx, so just to be sure: Is it always supported, or only with some config for the IP (I wanna know if I need to look out for it while reviewing other SoCs etc)? Also, do you have a link to the documentation for it? English is the only relevant language I speak, so if the doc is in Chinese, I'll need some help! > In addition, should X extensions get listed here? Yes, but someone who cares about documenting these extensions should do it ;) Thanks, Conor.
在 2023-09-25星期一的 16:59 +0100，Conor Dooley写道： > On Sun, Sep 24, 2023 at 07:22:30AM +0800, Icenowy Zheng wrote: > > 在 2023-09-22星期五的 09:13 +0100，Conor Dooley写道： > > > From: Conor Dooley <conor.dooley@microchip.com> > > > > > > Convert the th1520 devicetrees to use the new properties > > > "riscv,isa-base" & "riscv,isa-extensions". > > > For compatibility with other projects, "riscv,isa" remains. > > > > > > Signed-off-by: Conor Dooley <conor.dooley@microchip.com> > > > --- > > > arch/riscv/boot/dts/thead/th1520.dtsi | 12 ++++++++++++ > > > 1 file changed, 12 insertions(+) > > > > > > diff --git a/arch/riscv/boot/dts/thead/th1520.dtsi > > > b/arch/riscv/boot/dts/thead/th1520.dtsi > > > index ce708183b6f6..723f65487246 100644 > > > --- a/arch/riscv/boot/dts/thead/th1520.dtsi > > > +++ b/arch/riscv/boot/dts/thead/th1520.dtsi > > > @@ -20,6 +20,9 @@ c910_0: cpu@0 { > > > compatible = "thead,c910", "riscv"; > > > device_type = "cpu"; > > > riscv,isa = "rv64imafdc"; > > > + riscv,isa-base = "rv64i"; > > > + riscv,isa-extensions = "i", "m", "a", > > > "f", > > > "d", "c", "zicntr", "zicsr", > > > + "zifencei", > > > "zihpm"; > > > > Zfh is supported by T-Head C9xx with float too. > > You say xx, so just to be sure: Is it always supported, or only with > some config for the IP (I wanna know if I need to look out for it > while > reviewing other SoCs etc)? I think it's grouped with FD. > Also, do you have a link to the documentation for it? English is the > only relevant language I speak, so if the doc is in Chinese, I'll > need > some help! Sorry, but T-Head's official document [1] is only in Chinese. In addition, in this document half-float is listed as a "T-Head extension", but the encoding matches Zfh. See 15.6 Appendix B-6 Half Float (15.6 附录 B-6 浮点半精度指令术语) . [1] https://github.com/T-head-Semi/openc910/blob/main/doc/%E7%8E%84%E9%93%81C910%E7%94%A8%E6%88%B7%E6%89%8B%E5%86%8C.pdf > > > In addition, should X extensions get listed here? > > Yes, but someone who cares about documenting these extensions should > do > it ;) Well at least a bunch of Xthead's are now documented. Maybe they will get appended after this patchset get introduced. By the way, how to deal with the draft V of C9xx? > > Thanks, > Conor.
On Tue, Sep 26, 2023 at 11:15:27AM +0800, Icenowy Zheng wrote: > 在 2023-09-25星期一的 16:59 +0100，Conor Dooley写道： > > On Sun, Sep 24, 2023 at 07:22:30AM +0800, Icenowy Zheng wrote: > > > 在 2023-09-22星期五的 09:13 +0100，Conor Dooley写道： > > > > From: Conor Dooley <conor.dooley@microchip.com> > > > > > > > > Convert the th1520 devicetrees to use the new properties > > > > "riscv,isa-base" & "riscv,isa-extensions". > > > > For compatibility with other projects, "riscv,isa" remains. > > > > > > > > Signed-off-by: Conor Dooley <conor.dooley@microchip.com> > > > > --- > > > > arch/riscv/boot/dts/thead/th1520.dtsi | 12 ++++++++++++ > > > > 1 file changed, 12 insertions(+) > > > > > > > > diff --git a/arch/riscv/boot/dts/thead/th1520.dtsi > > > > b/arch/riscv/boot/dts/thead/th1520.dtsi > > > > index ce708183b6f6..723f65487246 100644 > > > > --- a/arch/riscv/boot/dts/thead/th1520.dtsi > > > > +++ b/arch/riscv/boot/dts/thead/th1520.dtsi > > > > @@ -20,6 +20,9 @@ c910_0: cpu@0 { > > > > compatible = "thead,c910", "riscv"; > > > > device_type = "cpu"; > > > > riscv,isa = "rv64imafdc"; > > > > + riscv,isa-base = "rv64i"; > > > > + riscv,isa-extensions = "i", "m", "a", > > > > "f", > > > > "d", "c", "zicntr", "zicsr", > > > > + "zifencei", > > > > "zihpm"; > > > > > > Zfh is supported by T-Head C9xx with float too. > > > > You say xx, so just to be sure: Is it always supported, or only with > > some config for the IP (I wanna know if I need to look out for it > > while > > reviewing other SoCs etc)? > > I think it's grouped with FD. > > > Also, do you have a link to the documentation for it? English is the > > only relevant language I speak, so if the doc is in Chinese, I'll > > need > > some help! > > Sorry, but T-Head's official document [1] is only in Chinese. In > addition, in this document half-float is listed as a "T-Head > extension", but the encoding matches Zfh. See 15.6 Appendix B-6 Half > Float (15.6 附录 B-6 浮点半精度指令术语) . Hmm, I'm not sure that I want to do this. Since it is only an "I think" and it's not *actually* advertised as being Zfh but apparently has matching encoding, I would rather someone who is capable of understanding that document submitted the patch. > [1] > https://github.com/T-head-Semi/openc910/blob/main/doc/%E7%8E%84%E9%93%81C910%E7%94%A8%E6%88%B7%E6%89%8B%E5%86%8C.pdf > > > > > > In addition, should X extensions get listed here? > > > > Yes, but someone who cares about documenting these extensions should > > do > > it ;) > > Well at least a bunch of Xthead's are now documented. I meant documented in the dt-binding, not documented in a pdf on GitHub. > Maybe they will get appended after this patchset get introduced. > > By the way, how to deal with the draft V of C9xx? Same deal, it'll have to be defined as a vendor extension in the dt-binding. Cheers, Conor.
On Fri, Sep 22, 2023 at 09:13:51AM +0100, Conor Dooley wrote: > From: Conor Dooley <conor.dooley@microchip.com> > > Convert the th1520 devicetrees to use the new properties > "riscv,isa-base" & "riscv,isa-extensions". > For compatibility with other projects, "riscv,isa" remains. > > Signed-off-by: Conor Dooley <conor.dooley@microchip.com> Reviewed-by: Jisheng Zhang <jszhang@kernel.org> > --- > arch/riscv/boot/dts/thead/th1520.dtsi | 12 ++++++++++++ > 1 file changed, 12 insertions(+) > > diff --git a/arch/riscv/boot/dts/thead/th1520.dtsi b/arch/riscv/boot/dts/thead/th1520.dtsi > index ce708183b6f6..723f65487246 100644 > --- a/arch/riscv/boot/dts/thead/th1520.dtsi > +++ b/arch/riscv/boot/dts/thead/th1520.dtsi > @@ -20,6 +20,9 @@ c910_0: cpu@0 { > compatible = "thead,c910", "riscv"; > device_type = "cpu"; > riscv,isa = "rv64imafdc"; > + riscv,isa-base = "rv64i"; > + riscv,isa-extensions = "i", "m", "a", "f", "d", "c", "zicntr", "zicsr", > + "zifencei", "zihpm"; > reg = <0>; > i-cache-block-size = <64>; > i-cache-size = <65536>; > @@ -41,6 +44,9 @@ c910_1: cpu@1 { > compatible = "thead,c910", "riscv"; > device_type = "cpu"; > riscv,isa = "rv64imafdc"; > + riscv,isa-base = "rv64i"; > + riscv,isa-extensions = "i", "m", "a", "f", "d", "c", "zicntr", "zicsr", > + "zifencei", "zihpm"; > reg = <1>; > i-cache-block-size = <64>; > i-cache-size = <65536>; > @@ -62,6 +68,9 @@ c910_2: cpu@2 { > compatible = "thead,c910", "riscv"; > device_type = "cpu"; > riscv,isa = "rv64imafdc"; > + riscv,isa-base = "rv64i"; > + riscv,isa-extensions = "i", "m", "a", "f", "d", "c", "zicntr", "zicsr", > + "zifencei", "zihpm"; > reg = <2>; > i-cache-block-size = <64>; > i-cache-size = <65536>; > @@ -83,6 +92,9 @@ c910_3: cpu@3 { > compatible = "thead,c910", "riscv"; > device_type = "cpu"; > riscv,isa = "rv64imafdc"; > + riscv,isa-base = "rv64i"; > + riscv,isa-extensions = "i", "m", "a", "f", "d", "c", "zicntr", "zicsr", > + "zifencei", "zihpm"; > reg = <3>; > i-cache-block-size = <64>; > i-cache-size = <65536>; > -- > 2.41.0 >
On Sat, Sep 23, 2023 at 6:25 PM Conor Dooley <conor@kernel.org> wrote: > > On Sat, Sep 23, 2023 at 03:50:36PM +0800, Guo Ren wrote: > > On Fri, Sep 22, 2023 at 4:16 PM Conor Dooley <conor@kernel.org> wrote: > > > > > > From: Conor Dooley <conor.dooley@microchip.com> > > > > > > Convert the th1520 devicetrees to use the new properties > > > "riscv,isa-base" & "riscv,isa-extensions". > > > For compatibility with other projects, "riscv,isa" remains. > > > > > > Signed-off-by: Conor Dooley <conor.dooley@microchip.com> > > > --- > > > arch/riscv/boot/dts/thead/th1520.dtsi | 12 ++++++++++++ > > > 1 file changed, 12 insertions(+) > > > > > > diff --git a/arch/riscv/boot/dts/thead/th1520.dtsi b/arch/riscv/boot/dts/thead/th1520.dtsi > > > index ce708183b6f6..723f65487246 100644 > > > --- a/arch/riscv/boot/dts/thead/th1520.dtsi > > > +++ b/arch/riscv/boot/dts/thead/th1520.dtsi > > > @@ -20,6 +20,9 @@ c910_0: cpu@0 { > > > compatible = "thead,c910", "riscv"; > > > device_type = "cpu"; > > > riscv,isa = "rv64imafdc"; > > > + riscv,isa-base = "rv64i"; > > > Why not riscv,isa-base = "rv64"? I saw "i" in the riscv,isa-extensions. > > I did it that way as a hedge against things changing in the future. I > have little trust in that part of the ISA specifications. Okay, that's clear enough. Acked-by: Guo Ren <guoren@kernel.org>
diff --git a/arch/riscv/boot/dts/thead/th1520.dtsi b/arch/riscv/boot/dts/thead/th1520.dtsi index ce708183b6f6..723f65487246 100644 --- a/arch/riscv/boot/dts/thead/th1520.dtsi +++ b/arch/riscv/boot/dts/thead/th1520.dtsi @@ -20,6 +20,9 @@ c910_0: cpu@0 { compatible = "thead,c910", "riscv"; device_type = "cpu"; riscv,isa = "rv64imafdc"; + riscv,isa-base = "rv64i"; + riscv,isa-extensions = "i", "m", "a", "f", "d", "c", "zicntr", "zicsr", + "zifencei", "zihpm"; reg = <0>; i-cache-block-size = <64>; i-cache-size = <65536>; @@ -41,6 +44,9 @@ c910_1: cpu@1 { compatible = "thead,c910", "riscv"; device_type = "cpu"; riscv,isa = "rv64imafdc"; + riscv,isa-base = "rv64i"; + riscv,isa-extensions = "i", "m", "a", "f", "d", "c", "zicntr", "zicsr", + "zifencei", "zihpm"; reg = <1>; i-cache-block-size = <64>; i-cache-size = <65536>; @@ -62,6 +68,9 @@ c910_2: cpu@2 { compatible = "thead,c910", "riscv"; device_type = "cpu"; riscv,isa = "rv64imafdc"; + riscv,isa-base = "rv64i"; + riscv,isa-extensions = "i", "m", "a", "f", "d", "c", "zicntr", "zicsr", + "zifencei", "zihpm"; reg = <2>; i-cache-block-size = <64>; i-cache-size = <65536>; @@ -83,6 +92,9 @@ c910_3: cpu@3 { compatible = "thead,c910", "riscv"; device_type = "cpu"; riscv,isa = "rv64imafdc"; + riscv,isa-base = "rv64i"; + riscv,isa-extensions = "i", "m", "a", "f", "d", "c", "zicntr", "zicsr", + "zifencei", "zihpm"; reg = <3>; i-cache-block-size = <64>; i-cache-size = <65536>;