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In-Reply-To: <20190827083700.GF682@rapoport-lnx> CC: anup@brainfault.org, aou@eecs.berkeley.edu, alankao@andestech.com, alexios.zavras@intel.com, Greg KH , linux-kernel@vger.kernel.org, Atish Patra , gary@garyguo.net, Paul Walmsley , linux-riscv@lists.infradead.org, tglx@linutronix.de From: Palmer Dabbelt To: rppt@linux.ibm.com Message-ID: Mime-Version: 1.0 (MHng) Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, 27 Aug 2019 01:37:00 PDT (-0700), rppt@linux.ibm.com wrote: > On Tue, Aug 27, 2019 at 01:58:03PM +0530, Anup Patel wrote: >> On Tue, Aug 27, 2019 at 1:21 PM Mike Rapoport wrote: >> > >> > On Mon, Aug 26, 2019 at 04:32:55PM -0700, Atish Patra wrote: >> > > As per the new SBI specification, current SBI implementation is >> > > defined as legacy and will be removed/replaced in future. >> > > >> > > Rename existing implementation to reflect that. This patch is just >> > > a preparatory patch for SBI v0.2 and doesn't introduce any functional >> > > changes. >> > > >> > > Signed-off-by: Atish Patra >> > > --- >> > > arch/riscv/include/asm/sbi.h | 61 +++++++++++++++++++----------------- >> > > 1 file changed, 33 insertions(+), 28 deletions(-) >> > > >> > > diff --git a/arch/riscv/include/asm/sbi.h b/arch/riscv/include/asm/sbi.h >> > > index 21134b3ef404..7f5ecaaaa0d7 100644 >> > > --- a/arch/riscv/include/asm/sbi.h >> > > +++ b/arch/riscv/include/asm/sbi.h >> > > @@ -8,17 +8,18 @@ >> > > >> > > #include >> > > >> > > -#define SBI_SET_TIMER 0 >> > > -#define SBI_CONSOLE_PUTCHAR 1 >> > > -#define SBI_CONSOLE_GETCHAR 2 >> > > -#define SBI_CLEAR_IPI 3 >> > > -#define SBI_SEND_IPI 4 >> > > -#define SBI_REMOTE_FENCE_I 5 >> > > -#define SBI_REMOTE_SFENCE_VMA 6 >> > > -#define SBI_REMOTE_SFENCE_VMA_ASID 7 >> > > -#define SBI_SHUTDOWN 8 >> > > - >> > > -#define SBI_CALL(which, arg0, arg1, arg2, arg3) ({ \ >> > > + >> > > +#define SBI_EXT_LEGACY_SET_TIMER 0x0 >> > > +#define SBI_EXT_LEGACY_CONSOLE_PUTCHAR 0x1 >> > > +#define SBI_EXT_LEGACY_CONSOLE_GETCHAR 0x2 >> > > +#define SBI_EXT_LEGACY_CLEAR_IPI 0x3 >> > > +#define SBI_EXT_LEGACY_SEND_IPI 0x4 >> > > +#define SBI_EXT_LEGACY_REMOTE_FENCE_I 0x5 >> > > +#define SBI_EXT_LEGACY_REMOTE_SFENCE_VMA 0x6 >> > > +#define SBI_EXT_LEGACY_REMOTE_SFENCE_VMA_ASID 0x7 >> > > +#define SBI_EXT_LEGACY_SHUTDOWN 0x8 >> > >> > I can't say I'm closely following RISC-V development, but what will happen >> > when SBI v0.3 will come out and will render v0.2 legacy? >> > Won't we need another similar renaming then? >> >> Going forward with SBI v0.3 and higher, we won't see any calling >> convention changes. >> >> The SBI spec will be maintained and improved by RISC-V UNIX >> platform spec working group. >> >> My best guess is that, all future SBI releases (v0.3 or higher) will >> include more optional SBI extensions (hart hotplug, power management, etc). > > Thanks for the clarification! Specifically the issue is that 0.1 didn't include any mechanism for probing the existence of a function, but since that has been added in 0.2 it's possible to maintain compatible with future versions. > >> Regards, >> Anup >> >> > >> > > +#define SBI_CALL_LEGACY(which, arg0, arg1, arg2, arg3) ({ \ >> > > register uintptr_t a0 asm ("a0") = (uintptr_t)(arg0); \ >> > > register uintptr_t a1 asm ("a1") = (uintptr_t)(arg1); \ >> > > register uintptr_t a2 asm ("a2") = (uintptr_t)(arg2); \ >> > > @@ -32,58 +33,61 @@ >> > > }) >> > > >> > > /* Lazy implementations until SBI is finalized */ >> > > -#define SBI_CALL_0(which) SBI_CALL(which, 0, 0, 0, 0) >> > > -#define SBI_CALL_1(which, arg0) SBI_CALL(which, arg0, 0, 0, 0) >> > > -#define SBI_CALL_2(which, arg0, arg1) SBI_CALL(which, arg0, arg1, 0, 0) >> > > -#define SBI_CALL_3(which, arg0, arg1, arg2) \ >> > > - SBI_CALL(which, arg0, arg1, arg2, 0) >> > > -#define SBI_CALL_4(which, arg0, arg1, arg2, arg3) \ >> > > - SBI_CALL(which, arg0, arg1, arg2, arg3) >> > > +#define SBI_CALL_LEGACY_0(which) SBI_CALL_LEGACY(which, 0, 0, 0, 0) >> > > +#define SBI_CALL_LEGACY_1(which, arg0) SBI_CALL_LEGACY(which, arg0, 0, 0, 0) >> > > +#define SBI_CALL_LEGACY_2(which, arg0, arg1) \ >> > > + SBI_CALL_LEGACY(which, arg0, arg1, 0, 0) >> > > +#define SBI_CALL_LEGACY_3(which, arg0, arg1, arg2) \ >> > > + SBI_CALL_LEGACY(which, arg0, arg1, arg2, 0) >> > > +#define SBI_CALL_LEGACY_4(which, arg0, arg1, arg2, arg3) \ >> > > + SBI_CALL_LEGACY(which, arg0, arg1, arg2, arg3) >> > > >> > > static inline void sbi_console_putchar(int ch) >> > > { >> > > - SBI_CALL_1(SBI_CONSOLE_PUTCHAR, ch); >> > > + SBI_CALL_LEGACY_1(SBI_EXT_LEGACY_CONSOLE_PUTCHAR, ch); >> > > } >> > > >> > > static inline int sbi_console_getchar(void) >> > > { >> > > - return SBI_CALL_0(SBI_CONSOLE_GETCHAR); >> > > + return SBI_CALL_LEGACY_0(SBI_EXT_LEGACY_CONSOLE_GETCHAR); >> > > } >> > > >> > > static inline void sbi_set_timer(uint64_t stime_value) >> > > { >> > > #if __riscv_xlen == 32 >> > > - SBI_CALL_2(SBI_SET_TIMER, stime_value, stime_value >> 32); >> > > + SBI_CALL_LEGACY_2(SBI_EXT_LEGACY_SET_TIMER, stime_value, >> > > + stime_value >> 32); >> > > #else >> > > - SBI_CALL_1(SBI_SET_TIMER, stime_value); >> > > + SBI_CALL_LEGACY_1(SBI_EXT_LEGACY_SET_TIMER, stime_value); >> > > #endif >> > > } >> > > >> > > static inline void sbi_shutdown(void) >> > > { >> > > - SBI_CALL_0(SBI_SHUTDOWN); >> > > + SBI_CALL_LEGACY_0(SBI_EXT_LEGACY_SHUTDOWN); >> > > } >> > > >> > > static inline void sbi_clear_ipi(void) >> > > { >> > > - SBI_CALL_0(SBI_CLEAR_IPI); >> > > + SBI_CALL_LEGACY_0(SBI_EXT_LEGACY_CLEAR_IPI); >> > > } >> > > >> > > static inline void sbi_send_ipi(const unsigned long *hart_mask) >> > > { >> > > - SBI_CALL_1(SBI_SEND_IPI, hart_mask); >> > > + SBI_CALL_LEGACY_1(SBI_EXT_LEGACY_SEND_IPI, hart_mask); >> > > } >> > > >> > > static inline void sbi_remote_fence_i(const unsigned long *hart_mask) >> > > { >> > > - SBI_CALL_1(SBI_REMOTE_FENCE_I, hart_mask); >> > > + SBI_CALL_LEGACY_1(SBI_EXT_LEGACY_REMOTE_FENCE_I, hart_mask); >> > > } >> > > >> > > static inline void sbi_remote_sfence_vma(const unsigned long *hart_mask, >> > > unsigned long start, >> > > unsigned long size) >> > > { >> > > - SBI_CALL_3(SBI_REMOTE_SFENCE_VMA, hart_mask, start, size); >> > > + SBI_CALL_LEGACY_3(SBI_EXT_LEGACY_REMOTE_SFENCE_VMA, hart_mask, >> > > + start, size); >> > > } >> > > >> > > static inline void sbi_remote_sfence_vma_asid(const unsigned long *hart_mask, >> > > @@ -91,7 +95,8 @@ static inline void sbi_remote_sfence_vma_asid(const unsigned long *hart_mask, >> > > unsigned long size, >> > > unsigned long asid) >> > > { >> > > - SBI_CALL_4(SBI_REMOTE_SFENCE_VMA_ASID, hart_mask, start, size, asid); >> > > + SBI_CALL_LEGACY_4(SBI_EXT_LEGACY_REMOTE_SFENCE_VMA_ASID, hart_mask, >> > > + start, size, asid); >> > > } >> > > >> > > #endif >> > > -- >> > > 2.21.0 >> > > >> > > >> > > _______________________________________________ >> > > linux-riscv mailing list >> > > linux-riscv@lists.infradead.org >> > > http://lists.infradead.org/mailman/listinfo/linux-riscv >> > > >> > >> > -- >> > Sincerely yours, >> > Mike. >> > >> > >> > _______________________________________________ >> > linux-riscv mailing list >> > linux-riscv@lists.infradead.org >> > http://lists.infradead.org/mailman/listinfo/linux-riscv >> >> _______________________________________________ >> linux-riscv mailing list >> linux-riscv@lists.infradead.org >> http://lists.infradead.org/mailman/listinfo/linux-riscv