| Message ID | 20240411-dev-charlie-support_thead_vector_6_9-v1-12-4af9815ec746@rivosinc.com (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | riscv: Support vendor extensions and xtheadvector | expand |
On Thu, Apr 11, 2024 at 09:11:18PM -0700, Charlie Jenkins wrote: > These definitions didn't fit anywhere nicely, so create a new file to > house various xtheadvector instruction encodings. > > Signed-off-by: Charlie Jenkins <charlie@rivosinc.com> > --- > arch/riscv/include/asm/xtheadvector.h | 25 +++++++++++++++++++++++++ > 1 file changed, 25 insertions(+) > > diff --git a/arch/riscv/include/asm/xtheadvector.h b/arch/riscv/include/asm/xtheadvector.h > new file mode 100644 > index 000000000000..348263ea164c > --- /dev/null > +++ b/arch/riscv/include/asm/xtheadvector.h > @@ -0,0 +1,25 @@ > +/* SPDX-License-Identifier: GPL-2.0-only */ > + > +/* > + * Vector 0.7.1 as used for example on T-Head Xuantie cores, uses an older > + * encoding for vsetvli (ta, ma vs. d1), so provide an instruction for > + * vsetvli t4, x0, e8, m8, d1 > + */ > +#define THEAD_VSETVLI_T4X0E8M8D1 ".long 0x00307ed7\n\t" > +#define THEAD_VSETVLI_X0X0E8M8D1 ".long 0x00307057\n\t" > + > +/* > + * While in theory, the vector-0.7.1 vsb.v and vlb.v result in the same > + * encoding as the standard vse8.v and vle8.v, compilers seem to optimize > + * the call resulting in a different encoding and then using a value for > + * the "mop" field that is not part of vector-0.7.1 > + * So encode specific variants for vstate_save and _restore. This wording seems oddly familiar to me, did Heiko not write this? > + */ > +#define THEAD_VSB_V_V0T0 ".long 0x02028027\n\t" > +#define THEAD_VSB_V_V8T0 ".long 0x02028427\n\t" > +#define THEAD_VSB_V_V16T0 ".long 0x02028827\n\t" > +#define THEAD_VSB_V_V24T0 ".long 0x02028c27\n\t" > +#define THEAD_VLB_V_V0T0 ".long 0x012028007\n\t" > +#define THEAD_VLB_V_V8T0 ".long 0x012028407\n\t" > +#define THEAD_VLB_V_V16T0 ".long 0x012028807\n\t" > +#define THEAD_VLB_V_V24T0 ".long 0x012028c07\n\t" > > -- > 2.44.0 >
On Fri, Apr 12, 2024 at 12:30:32PM +0100, Conor Dooley wrote: > On Thu, Apr 11, 2024 at 09:11:18PM -0700, Charlie Jenkins wrote: > > These definitions didn't fit anywhere nicely, so create a new file to > > house various xtheadvector instruction encodings. > > > > Signed-off-by: Charlie Jenkins <charlie@rivosinc.com> > > --- > > arch/riscv/include/asm/xtheadvector.h | 25 +++++++++++++++++++++++++ > > 1 file changed, 25 insertions(+) > > > > diff --git a/arch/riscv/include/asm/xtheadvector.h b/arch/riscv/include/asm/xtheadvector.h > > new file mode 100644 > > index 000000000000..348263ea164c > > --- /dev/null > > +++ b/arch/riscv/include/asm/xtheadvector.h > > @@ -0,0 +1,25 @@ > > +/* SPDX-License-Identifier: GPL-2.0-only */ > > + > > +/* > > + * Vector 0.7.1 as used for example on T-Head Xuantie cores, uses an older > > + * encoding for vsetvli (ta, ma vs. d1), so provide an instruction for > > + * vsetvli t4, x0, e8, m8, d1 > > + */ > > +#define THEAD_VSETVLI_T4X0E8M8D1 ".long 0x00307ed7\n\t" > > +#define THEAD_VSETVLI_X0X0E8M8D1 ".long 0x00307057\n\t" > > + > > +/* > > + * While in theory, the vector-0.7.1 vsb.v and vlb.v result in the same > > + * encoding as the standard vse8.v and vle8.v, compilers seem to optimize > > + * the call resulting in a different encoding and then using a value for > > + * the "mop" field that is not part of vector-0.7.1 > > + * So encode specific variants for vstate_save and _restore. > > This wording seems oddly familiar to me, did Heiko not write this? Yeah, I wasn't sure how to attribute him. He wrote almost all of the lines in this file, but I put it together into this file. What is the standard way of doing that? - Charlie > > > + */ > > +#define THEAD_VSB_V_V0T0 ".long 0x02028027\n\t" > > +#define THEAD_VSB_V_V8T0 ".long 0x02028427\n\t" > > +#define THEAD_VSB_V_V16T0 ".long 0x02028827\n\t" > > +#define THEAD_VSB_V_V24T0 ".long 0x02028c27\n\t" > > +#define THEAD_VLB_V_V0T0 ".long 0x012028007\n\t" > > +#define THEAD_VLB_V_V8T0 ".long 0x012028407\n\t" > > +#define THEAD_VLB_V_V16T0 ".long 0x012028807\n\t" > > +#define THEAD_VLB_V_V24T0 ".long 0x012028c07\n\t" > > > > -- > > 2.44.0 > >
On Fri, Apr 12, 2024 at 11:24:35AM -0700, Charlie Jenkins wrote: > On Fri, Apr 12, 2024 at 12:30:32PM +0100, Conor Dooley wrote: > > On Thu, Apr 11, 2024 at 09:11:18PM -0700, Charlie Jenkins wrote: > > > These definitions didn't fit anywhere nicely, so create a new file to > > > house various xtheadvector instruction encodings. > > > > > > Signed-off-by: Charlie Jenkins <charlie@rivosinc.com> > > > --- > > > arch/riscv/include/asm/xtheadvector.h | 25 +++++++++++++++++++++++++ > > > 1 file changed, 25 insertions(+) > > > > > > diff --git a/arch/riscv/include/asm/xtheadvector.h b/arch/riscv/include/asm/xtheadvector.h > > > new file mode 100644 > > > index 000000000000..348263ea164c > > > --- /dev/null > > > +++ b/arch/riscv/include/asm/xtheadvector.h > > > @@ -0,0 +1,25 @@ > > > +/* SPDX-License-Identifier: GPL-2.0-only */ > > > + > > > +/* > > > + * Vector 0.7.1 as used for example on T-Head Xuantie cores, uses an older > > > + * encoding for vsetvli (ta, ma vs. d1), so provide an instruction for > > > + * vsetvli t4, x0, e8, m8, d1 > > > + */ > > > +#define THEAD_VSETVLI_T4X0E8M8D1 ".long 0x00307ed7\n\t" > > > +#define THEAD_VSETVLI_X0X0E8M8D1 ".long 0x00307057\n\t" > > > + > > > +/* > > > + * While in theory, the vector-0.7.1 vsb.v and vlb.v result in the same > > > + * encoding as the standard vse8.v and vle8.v, compilers seem to optimize > > > + * the call resulting in a different encoding and then using a value for > > > + * the "mop" field that is not part of vector-0.7.1 > > > + * So encode specific variants for vstate_save and _restore. > > > > This wording seems oddly familiar to me, did Heiko not write this? > > Yeah, I wasn't sure how to attribute him. He wrote almost all of the > lines in this file, but I put it together into this file. What is the > standard way of doing that? The original patches have his sob and authorship, so I would at least expect co-developed-by.
On Fri, Apr 12, 2024 at 08:00:46PM +0100, Conor Dooley wrote: > On Fri, Apr 12, 2024 at 11:24:35AM -0700, Charlie Jenkins wrote: > > On Fri, Apr 12, 2024 at 12:30:32PM +0100, Conor Dooley wrote: > > > On Thu, Apr 11, 2024 at 09:11:18PM -0700, Charlie Jenkins wrote: > > > > These definitions didn't fit anywhere nicely, so create a new file to > > > > house various xtheadvector instruction encodings. > > > > > > > > Signed-off-by: Charlie Jenkins <charlie@rivosinc.com> > > > > --- > > > > arch/riscv/include/asm/xtheadvector.h | 25 +++++++++++++++++++++++++ > > > > 1 file changed, 25 insertions(+) > > > > > > > > diff --git a/arch/riscv/include/asm/xtheadvector.h b/arch/riscv/include/asm/xtheadvector.h > > > > new file mode 100644 > > > > index 000000000000..348263ea164c > > > > --- /dev/null > > > > +++ b/arch/riscv/include/asm/xtheadvector.h > > > > @@ -0,0 +1,25 @@ > > > > +/* SPDX-License-Identifier: GPL-2.0-only */ > > > > + > > > > +/* > > > > + * Vector 0.7.1 as used for example on T-Head Xuantie cores, uses an older > > > > + * encoding for vsetvli (ta, ma vs. d1), so provide an instruction for > > > > + * vsetvli t4, x0, e8, m8, d1 > > > > + */ > > > > +#define THEAD_VSETVLI_T4X0E8M8D1 ".long 0x00307ed7\n\t" > > > > +#define THEAD_VSETVLI_X0X0E8M8D1 ".long 0x00307057\n\t" > > > > + > > > > +/* > > > > + * While in theory, the vector-0.7.1 vsb.v and vlb.v result in the same > > > > + * encoding as the standard vse8.v and vle8.v, compilers seem to optimize > > > > + * the call resulting in a different encoding and then using a value for > > > > + * the "mop" field that is not part of vector-0.7.1 > > > > + * So encode specific variants for vstate_save and _restore. > > > > > > This wording seems oddly familiar to me, did Heiko not write this? > > > > Yeah, I wasn't sure how to attribute him. He wrote almost all of the > > lines in this file, but I put it together into this file. What is the > > standard way of doing that? > > The original patches have his sob and authorship, so I would at least > expect co-developed-by. Perfect, thank you for pointing me in the right direction. - Charlie
diff --git a/arch/riscv/include/asm/xtheadvector.h b/arch/riscv/include/asm/xtheadvector.h new file mode 100644 index 000000000000..348263ea164c --- /dev/null +++ b/arch/riscv/include/asm/xtheadvector.h @@ -0,0 +1,25 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ + +/* + * Vector 0.7.1 as used for example on T-Head Xuantie cores, uses an older + * encoding for vsetvli (ta, ma vs. d1), so provide an instruction for + * vsetvli t4, x0, e8, m8, d1 + */ +#define THEAD_VSETVLI_T4X0E8M8D1 ".long 0x00307ed7\n\t" +#define THEAD_VSETVLI_X0X0E8M8D1 ".long 0x00307057\n\t" + +/* + * While in theory, the vector-0.7.1 vsb.v and vlb.v result in the same + * encoding as the standard vse8.v and vle8.v, compilers seem to optimize + * the call resulting in a different encoding and then using a value for + * the "mop" field that is not part of vector-0.7.1 + * So encode specific variants for vstate_save and _restore. + */ +#define THEAD_VSB_V_V0T0 ".long 0x02028027\n\t" +#define THEAD_VSB_V_V8T0 ".long 0x02028427\n\t" +#define THEAD_VSB_V_V16T0 ".long 0x02028827\n\t" +#define THEAD_VSB_V_V24T0 ".long 0x02028c27\n\t" +#define THEAD_VLB_V_V0T0 ".long 0x012028007\n\t" +#define THEAD_VLB_V_V8T0 ".long 0x012028407\n\t" +#define THEAD_VLB_V_V16T0 ".long 0x012028807\n\t" +#define THEAD_VLB_V_V24T0 ".long 0x012028c07\n\t"
These definitions didn't fit anywhere nicely, so create a new file to house various xtheadvector instruction encodings. Signed-off-by: Charlie Jenkins <charlie@rivosinc.com> --- arch/riscv/include/asm/xtheadvector.h | 25 +++++++++++++++++++++++++ 1 file changed, 25 insertions(+)