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Tue, 27 Aug 2019 20:30:45 +0000 From: Atish Patra To: "anup@brainfault.org" , "rppt@linux.ibm.com" CC: "linux-riscv@lists.infradead.org" , "alankao@andestech.com" , "gregkh@linuxfoundation.org" , "gary@garyguo.net" , "paul.walmsley@sifive.com" , "aou@eecs.berkeley.edu" , "linux-kernel@vger.kernel.org" , "tglx@linutronix.de" , "alexios.zavras@intel.com" , "palmer@sifive.com" Subject: Re: [RFC PATCH 2/2] RISC-V: Add basic support for SBI v0.2 Thread-Topic: [RFC PATCH 2/2] RISC-V: Add basic support for SBI v0.2 Thread-Index: AQHVXGawG+IpOh5bxU6Og3bOIuxxjKcOoaMAgAAG8YCAAARtgIAAxsyA Date: Tue, 27 Aug 2019 20:30:45 +0000 Message-ID: <8e7eea1435c121d3cdbe484af85814583daaf547.camel@wdc.com> References: <20190826233256.32383-1-atish.patra@wdc.com> <20190826233256.32383-3-atish.patra@wdc.com> <20190827075831.GD682@rapoport-lnx> <20190827083913.GG682@rapoport-lnx> In-Reply-To: <20190827083913.GG682@rapoport-lnx> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: 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62TbxDawBfFJ6/UnVswSJxh7ln1R1pJCl3rkXH2FGahsmSqtOiRQA1X3dRDHW+JBuA2SiXayIW0SCNHBPwwQmQ== X-MS-Exchange-Transport-CrossTenantHeadersStamped: BYAPR04MB4325 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190827_133049_031067_B5C761AE X-CRM114-Status: GOOD ( 27.31 ) X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: "aou@eecs.berkeley.edu" , "alankao@andestech.com" , "gregkh@linuxfoundation.org" , "palmer@sifive.com" , "linux-kernel@vger.kernel.org" , "alexios.zavras@intel.com" , "gary@garyguo.net" , "paul.walmsley@sifive.com" , "linux-riscv@lists.infradead.org" , "tglx@linutronix.de" Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-riscv" Errors-To: linux-riscv-bounces+infradead-linux-riscv=archiver.kernel.org@lists.infradead.org On Tue, 2019-08-27 at 11:39 +0300, Mike Rapoport wrote: > On Tue, Aug 27, 2019 at 01:53:23PM +0530, Anup Patel wrote: > > On Tue, Aug 27, 2019 at 1:28 PM Mike Rapoport > > wrote: > > > On Mon, Aug 26, 2019 at 04:32:56PM -0700, Atish Patra wrote: > > > > The SBI v0.2 introduces a base extension which is backward > > > > compatible > > > > with v0.1. Implement all helper functions and minimum required > > > > SBI > > > > calls from v0.2 for now. All other base extension function will > > > > be > > > > added later as per need. > > > > > > > > Signed-off-by: Atish Patra > > > > --- > > > > arch/riscv/include/asm/sbi.h | 68 > > > > +++++++++++++++++++++++++++++------- > > > > arch/riscv/kernel/Makefile | 1 + > > > > arch/riscv/kernel/sbi.c | 50 ++++++++++++++++++++++++++ > > > > arch/riscv/kernel/setup.c | 2 ++ > > > > 4 files changed, 108 insertions(+), 13 deletions(-) > > > > create mode 100644 arch/riscv/kernel/sbi.c > > > > > > > > diff --git a/arch/riscv/include/asm/sbi.h > > > > b/arch/riscv/include/asm/sbi.h > > > > index 7f5ecaaaa0d7..4a4476956693 100644 > > > > --- a/arch/riscv/include/asm/sbi.h > > > > +++ b/arch/riscv/include/asm/sbi.h > > > > @@ -8,7 +8,6 @@ > > > > > > > > #include > > > > > > > > - > > > > #define SBI_EXT_LEGACY_SET_TIMER 0x0 > > > > #define SBI_EXT_LEGACY_CONSOLE_PUTCHAR 0x1 > > > > #define SBI_EXT_LEGACY_CONSOLE_GETCHAR 0x2 > > > > @@ -19,28 +18,61 @@ > > > > #define SBI_EXT_LEGACY_REMOTE_SFENCE_VMA_ASID 0x7 > > > > #define SBI_EXT_LEGACY_SHUTDOWN 0x8 > > > > > > > > -#define SBI_CALL_LEGACY(which, arg0, arg1, arg2, arg3) > > > > ({ \ > > > > +#define SBI_EXT_BASE 0x10 > > > > + > > > > +enum sbi_ext_base_fid { > > > > + SBI_EXT_BASE_GET_SPEC_VERSION = 0, > > > > + SBI_EXT_BASE_GET_IMP_ID, > > > > + SBI_EXT_BASE_GET_IMP_VERSION, > > > > + SBI_EXT_BASE_PROBE_EXT, > > > > + SBI_EXT_BASE_GET_MVENDORID, > > > > + SBI_EXT_BASE_GET_MARCHID, > > > > + SBI_EXT_BASE_GET_MIMPID, > > > > +}; > > > > + > > > > +#define SBI_CALL_LEGACY(ext, fid, 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); \ > > > > register uintptr_t a3 asm ("a3") = (uintptr_t)(arg3); \ > > > > - register uintptr_t a7 asm ("a7") = (uintptr_t)(which); \ > > > > + register uintptr_t a6 asm ("a6") = (uintptr_t)(fid); \ > > > > + register uintptr_t a7 asm ("a7") = (uintptr_t)(ext); \ > > > > asm volatile ("ecall" \ > > > > - : "+r" (a0) \ > > > > - : "r" (a1), "r" (a2), "r" (a3), "r" (a7) \ > > > > + : "+r" (a0), "+r" (a1) \ > > > > + : "r" (a2), "r" (a3), "r" (a6), "r" (a7) \ > > > > > > Maybe I'm missing something, but how is this supposed to work on > > > systems > > > with SBI v0.1? Wouldn't this cause a mismatch in the registers? > > > > The SBI v0.2 has two major changes: > > 1. New improved calling convention which is backward compatible > > with SBI v0.1 so older kernels with SBI v0.1 will continue to work > > as-is. > > 2. Base set of mandatory SBI v0.2 calls which can be used to detect > > SBI version, check supported SBI calls and extentions. > > > > Old calling convention in SBI v0.1 was: > > Parameters: > > a0 -> arg0 > > a1 -> arg1 > > a2 -> arg2 > > a3 -> arg3 > > a7 -> function_id > > Return: > > a0 -> return value or error code > > > > In SBI v0.2, we have extension and function. Each SBI extension > > is a set of function. The new calling convention in SBI v0.2 is: > > Parameters: > > a0 -> arg0 > > a1 -> arg1 > > a2 -> arg2 > > a3 -> arg3 > > a6 -> function_id > > a7 -> extension_id > > Return: > > a0 -> error code > > a1 -> return value (optional) > > So with this patch SBI_CALL_LEGACY() uses SBI v0.2 convention, right? > Doesn't it mean that you cannot run a new kernel on a system with SBI > v0.1? > Thanks Anup for the earlier explaination. I have used SBI v0.2 convention for legacy calls as well to keep both in sync and more redable. I just set a6 to zero and do not use a1 as a return value. With this, both SBI implementation & kernel are backward compatible in both ways. Any newer kernels using SBI calls defined in 0.2 or later will use new convention(SBI_CALL_*) and older SBI calls will continue to will continue to use SBI_CALL_LEGACY*. I thought this is more readable but probably it is not. I will preserve the legacy convention and use different calling conventions based on the firmware version. > > All legacy SBI v0.1 functions can be thought of as separate > > extensions. That's how SBI v0.2 will be backward compatible. > > > > Regards, > > Anup > > > > > > : "memory"); \ > > > > a0; \ > > > > }) > > > > > > > > /* Lazy implementations until SBI is finalized */ > > > > -#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) > > > > +#define SBI_CALL_LEGACY_0(ext) SBI_CALL_LEGACY(ext, 0, 0, 0, > > > > 0, 0) > > > > +#define SBI_CALL_LEGACY_1(ext, arg0) SBI_CALL_LEGACY(ext, 0, > > > > arg0, 0, 0, 0) > > > > +#define SBI_CALL_LEGACY_2(ext, arg0, arg1) \ > > > > + SBI_CALL_LEGACY(ext, 0, arg0, arg1, 0, 0) > > > > +#define SBI_CALL_LEGACY_3(ext, arg0, arg1, arg2) \ > > > > + SBI_CALL_LEGACY(ext, 0, arg0, arg1, arg2, 0) > > > > +#define SBI_CALL_LEGACY_4(ext, arg0, arg1, arg2, arg3) \ > > > > + SBI_CALL_LEGACY(ext, 0, arg0, arg1, arg2, arg3) > > > > + > > > > +extern unsigned long sbi_firmware_version; > > > > +struct sbiret { > > > > + long error; > > > > + long value; > > > > +}; > > > > + > > > > +void riscv_sbi_init(void); > > > > +struct sbiret riscv_sbi_ecall(int ext, int fid, int arg0, int > > > > arg1, > > > > + int arg2, int arg3); > > > > + > > > > +#define SBI_CALL_0(ext, fid) riscv_sbi_ecall(ext, fid, 0, 0, > > > > 0, 0) > > > > +#define SBI_CALL_1(ext, fid, arg0) riscv_sbi_ecall(ext, fid, > > > > arg0, 0, 0, 0) > > > > +#define SBI_CALL_2(ext, fid, arg0, arg1) \ > > > > + riscv_sbi_ecall(ext, fid, arg0, arg1, 0, 0) > > > > +#define SBI_CALL_3(ext, fid, arg0, arg1, arg2) \ > > > > + riscv_sbi_ecall(ext, fid, arg0, arg1, arg2, 0) > > > > +#define SBI_CALL_4(ext, fid, arg0, arg1, arg2, arg3) \ > > > > + riscv_sbi_ecall(ext, fid, arg0, arg1, arg2, arg3) > > > > + > > > > > > > > static inline void sbi_console_putchar(int ch) > > > > { > > > > @@ -99,4 +131,14 @@ static inline void > > > > sbi_remote_sfence_vma_asid(const unsigned long *hart_mask, > > > > start, size, asid); > > > > } > > > > > > > > +static inline unsigned long riscv_sbi_major_version(void) > > > > +{ > > > > + return (sbi_firmware_version >> 24) & 0x7f; > > > > +} > > > > + > > > > +static inline unsigned long riscv_sbi_minor_version(void) > > > > +{ > > > > + return sbi_firmware_version & 0xffffff; > > > > +} > > > > + > > > > #endif > > > > diff --git a/arch/riscv/kernel/Makefile > > > > b/arch/riscv/kernel/Makefile > > > > index 2420d37d96de..faf862d26924 100644 > > > > --- a/arch/riscv/kernel/Makefile > > > > +++ b/arch/riscv/kernel/Makefile > > > > @@ -17,6 +17,7 @@ obj-y += irq.o > > > > obj-y += process.o > > > > obj-y += ptrace.o > > > > obj-y += reset.o > > > > +obj-y += sbi.o > > > > obj-y += setup.o > > > > obj-y += signal.o > > > > obj-y += syscall_table.o > > > > diff --git a/arch/riscv/kernel/sbi.c b/arch/riscv/kernel/sbi.c > > > > new file mode 100644 > > > > index 000000000000..457b8cc0e9d9 > > > > --- /dev/null > > > > +++ b/arch/riscv/kernel/sbi.c > > > > @@ -0,0 +1,50 @@ > > > > +// SPDX-License-Identifier: GPL-2.0-only > > > > +/* > > > > + * SBI initialilization and base extension implementation. > > > > + * > > > > + * Copyright (c) 2019 Western Digital Corporation or its > > > > affiliates. > > > > + */ > > > > + > > > > +#include > > > > +#include > > > > + > > > > +unsigned long sbi_firmware_version; > > > > + > > > > +struct sbiret riscv_sbi_ecall(int ext, int fid, int arg0, int > > > > arg1, > > > > + int arg2, int arg3) > > > > +{ > > > > + struct sbiret ret; > > > > + > > > > + 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); > > > > + register uintptr_t a3 asm ("a3") = (uintptr_t)(arg3); > > > > + register uintptr_t a6 asm ("a6") = (uintptr_t)(fid); > > > > + register uintptr_t a7 asm ("a7") = (uintptr_t)(ext); > > > > + asm volatile ("ecall" > > > > + : "+r" (a0), "+r" (a1) > > > > + : "r" (a2), "r" (a3), "r" (a6), "r" (a7) > > > > + : "memory"); > > > > + ret.error = a0; > > > > + ret.value = a1; > > > > + > > > > + return ret; > > > > +} > > > > + > > > > +static struct sbiret sbi_get_spec_version(void) > > > > +{ > > > > + return SBI_CALL_0(SBI_EXT_BASE, > > > > SBI_EXT_BASE_GET_SPEC_VERSION); > > > > +} > > > > + > > > > +void riscv_sbi_init(void) > > > > +{ > > > > + struct sbiret ret; > > > > + > > > > + /* legacy SBI version*/ > > > > + sbi_firmware_version = 0x1; > > > > + ret = sbi_get_spec_version(); > > > > + if (!ret.error) > > > > + sbi_firmware_version = ret.value; > > > > + pr_info("SBI version implemented in firmware > > > > [%lu:%lu]\n", > > > > + riscv_sbi_major_version(), > > > > riscv_sbi_minor_version()); > > > > +} > > > > diff --git a/arch/riscv/kernel/setup.c > > > > b/arch/riscv/kernel/setup.c > > > > index a990a6cb184f..4c324fd398c8 100644 > > > > --- a/arch/riscv/kernel/setup.c > > > > +++ b/arch/riscv/kernel/setup.c > > > > @@ -21,6 +21,7 @@ > > > > #include > > > > #include > > > > #include > > > > +#include > > > > #include > > > > #include > > > > > > > > @@ -70,6 +71,7 @@ void __init setup_arch(char **cmdline_p) > > > > swiotlb_init(1); > > > > #endif > > > > > > > > + riscv_sbi_init(); > > > > #ifdef CONFIG_SMP > > > > setup_smp(); > > > > #endif > > > > -- > > > > 2.21.0 > > > > > > > > > > > > _______________________________________________ > > > > linux-riscv mailing list > > > > linux-riscv@lists.infradead.org > > > > http://lists.infradead.org/mailman/listinfo/linux-riscv > > > > > > -- > > > Sincerely yours, > > > Mike. > > > -- Regards, Atish _______________________________________________ linux-riscv mailing list linux-riscv@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-riscv