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Date: Wed, 12 Feb 2020 11:54:32 -0800
From: Atish Patra <atishp@...shpatra.org>
To: Anup Patel <anup@...infault.org>
Cc: Atish Patra <atish.patra@....com>,
Albert Ou <aou@...s.berkeley.edu>,
Jason Cooper <jason@...edaemon.net>,
Marc Zyngier <maz@...nel.org>,
Daniel Lezcano <daniel.lezcano@...aro.org>,
Heiko Carstens <heiko.carstens@...ibm.com>,
"linux-kernel@...r.kernel.org List" <linux-kernel@...r.kernel.org>,
Mike Rapoport <rppt@...ux.ibm.com>,
Vincent Chen <vincent.chen@...ive.com>,
Mao Han <han_mao@...ky.com>,
Geert Uytterhoeven <geert@...ux-m68k.org>,
"Eric W. Biederman" <ebiederm@...ssion.com>,
Paul Walmsley <paul.walmsley@...ive.com>,
Michael Ellerman <mpe@...erman.id.au>,
Marek Szyprowski <m.szyprowski@...sung.com>,
Palmer Dabbelt <palmer@...belt.com>,
linux-riscv <linux-riscv@...ts.infradead.org>,
Borislav Petkov <bp@...e.de>,
Thomas Gleixner <tglx@...utronix.de>,
Allison Randal <allison@...utok.net>,
Kees Cook <keescook@...omium.org>
Subject: Re: [PATCH v8 08/11] RISC-V: Add SBI HSM extension
On Tue, Feb 11, 2020 at 8:53 PM Anup Patel <anup@...infault.org> wrote:
>
> On Wed, Feb 12, 2020 at 7:22 AM Atish Patra <atish.patra@....com> wrote:
> >
> > SBI specification defines HSM extension that allows to start/stop a hart
> > by a supervisor anytime. The specification is available at
> >
> > https://github.com/riscv/riscv-sbi-doc/blob/master/riscv-sbi.adoc
> >
> > Implement SBI HSM extension.
>
> I think this PATCH needs to be further broken down.
>
> There are three distinct changes here:
> 1. Exporting sbi_err_map_linux_errno() function
> arch/riscv/kernel/sbi.c
> arch/riscv/include/asm/sbi.h
> 2. SBI HSM defines
> arch/riscv/include/asm/sbi.h
> 3. SBI HSM helper functions (which are mostly static functions)
> arch/riscv/kernel/Makefile
> arch/riscv/kernel/cpu_ops_sbi.c
>
> We need separate patches for point1 and point2 above.
>
> Also, point3 can be part of current PATCH9.
>
Done.
> Regards,
> Anup
>
> >
> > Signed-off-by: Atish Patra <atish.patra@....com>
> > ---
> > arch/riscv/include/asm/sbi.h | 15 +++++++++++
> > arch/riscv/kernel/Makefile | 3 +++
> > arch/riscv/kernel/cpu_ops_sbi.c | 48 +++++++++++++++++++++++++++++++++
> > arch/riscv/kernel/sbi.c | 3 ++-
> > 4 files changed, 68 insertions(+), 1 deletion(-)
> > create mode 100644 arch/riscv/kernel/cpu_ops_sbi.c
> >
> > diff --git a/arch/riscv/include/asm/sbi.h b/arch/riscv/include/asm/sbi.h
> > index d55d8090ab5c..0981a0c97eda 100644
> > --- a/arch/riscv/include/asm/sbi.h
> > +++ b/arch/riscv/include/asm/sbi.h
> > @@ -26,6 +26,7 @@ enum sbi_ext_id {
> > SBI_EXT_TIME = 0x54494D45,
> > SBI_EXT_IPI = 0x735049,
> > SBI_EXT_RFENCE = 0x52464E43,
> > + SBI_EXT_HSM = 0x48534D,
> > };
> >
> > enum sbi_ext_base_fid {
> > @@ -56,6 +57,19 @@ enum sbi_ext_rfence_fid {
> > SBI_EXT_RFENCE_REMOTE_HFENCE_VVMA_ASID,
> > };
> >
> > +enum sbi_ext_hsm_fid {
> > + SBI_EXT_HSM_HART_START = 0,
> > + SBI_EXT_HSM_HART_STOP,
> > + SBI_EXT_HSM_HART_STATUS,
> > +};
> > +
> > +enum sbi_hsm_hart_status {
> > + SBI_HSM_HART_STATUS_AVAILABLE = 0,
> > + SBI_HSM_HART_STATUS_NOT_AVAILABLE,
> > + SBI_HSM_HART_STATUS_START_PENDING,
> > + SBI_HSM_HART_STATUS_STOP_PENDING,
> > +};
> > +
> > #define SBI_SPEC_VERSION_DEFAULT 0x1
> > #define SBI_SPEC_VERSION_MAJOR_SHIFT 24
> > #define SBI_SPEC_VERSION_MAJOR_MASK 0x7f
> > @@ -130,6 +144,7 @@ static inline unsigned long sbi_minor_version(void)
> > {
> > return sbi_spec_version & SBI_SPEC_VERSION_MINOR_MASK;
> > }
> > +int sbi_err_map_linux_errno(int err);
> > #else /* CONFIG_RISCV_SBI */
> > /* stubs for code that is only reachable under IS_ENABLED(CONFIG_RISCV_SBI): */
> > void sbi_set_timer(uint64_t stime_value);
> > diff --git a/arch/riscv/kernel/Makefile b/arch/riscv/kernel/Makefile
> > index f81a6ff88005..a0be34b96846 100644
> > --- a/arch/riscv/kernel/Makefile
> > +++ b/arch/riscv/kernel/Makefile
> > @@ -44,5 +44,8 @@ obj-$(CONFIG_PERF_EVENTS) += perf_event.o
> > obj-$(CONFIG_PERF_EVENTS) += perf_callchain.o
> > obj-$(CONFIG_HAVE_PERF_REGS) += perf_regs.o
> > obj-$(CONFIG_RISCV_SBI) += sbi.o
> > +ifeq ($(CONFIG_RISCV_SBI), y)
> > +obj-$(CONFIG_SMP) += cpu_ops_sbi.o
> > +endif
> >
> > clean:
> > diff --git a/arch/riscv/kernel/cpu_ops_sbi.c b/arch/riscv/kernel/cpu_ops_sbi.c
> > new file mode 100644
> > index 000000000000..9bdb60e0a4df
> > --- /dev/null
> > +++ b/arch/riscv/kernel/cpu_ops_sbi.c
> > @@ -0,0 +1,48 @@
> > +// SPDX-License-Identifier: GPL-2.0-only
> > +/*
> > + * HSM extension and cpu_ops implementation.
> > + *
> > + * Copyright (c) 2020 Western Digital Corporation or its affiliates.
> > + */
> > +
> > +#include <linux/init.h>
> > +#include <linux/mm.h>
> > +#include <asm/sbi.h>
> > +#include <asm/smp.h>
> > +
> > +static int sbi_hsm_hart_stop(void)
> > +{
> > + struct sbiret ret;
> > +
> > + ret = sbi_ecall(SBI_EXT_HSM, SBI_EXT_HSM_HART_STOP, 0, 0, 0, 0, 0, 0);
> > +
> > + if (ret.error)
> > + return sbi_err_map_linux_errno(ret.error);
> > + else
> > + return 0;
> > +}
> > +
> > +static int sbi_hsm_hart_start(unsigned long hartid, unsigned long saddr,
> > + unsigned long priv)
> > +{
> > + struct sbiret ret;
> > +
> > + ret = sbi_ecall(SBI_EXT_HSM, SBI_EXT_HSM_HART_START,
> > + hartid, saddr, priv, 0, 0, 0);
> > + if (ret.error)
> > + return sbi_err_map_linux_errno(ret.error);
> > + else
> > + return 0;
> > +}
> > +
> > +static int sbi_hsm_hart_get_status(unsigned long hartid)
> > +{
> > + struct sbiret ret;
> > +
> > + ret = sbi_ecall(SBI_EXT_HSM, SBI_EXT_HSM_HART_STATUS,
> > + hartid, 0, 0, 0, 0, 0);
> > + if (ret.error)
> > + return sbi_err_map_linux_errno(ret.error);
> > + else
> > + return ret.value;
> > +}
> > diff --git a/arch/riscv/kernel/sbi.c b/arch/riscv/kernel/sbi.c
> > index cd0f68aeac70..45ad49269f2c 100644
> > --- a/arch/riscv/kernel/sbi.c
> > +++ b/arch/riscv/kernel/sbi.c
> > @@ -47,7 +47,7 @@ struct sbiret sbi_ecall(int ext, int fid, unsigned long arg0,
> > }
> > EXPORT_SYMBOL(sbi_ecall);
> >
> > -static int sbi_err_map_linux_errno(int err)
> > +int sbi_err_map_linux_errno(int err)
> > {
> > switch (err) {
> > case SBI_SUCCESS:
> > @@ -64,6 +64,7 @@ static int sbi_err_map_linux_errno(int err)
> > return -ENOTSUPP;
> > };
> > }
> > +EXPORT_SYMBOL(sbi_err_map_linux_errno);
> >
> > #ifdef CONFIG_RISCV_SBI_V01
> > /**
> > --
> > 2.24.0
> >
>
--
Regards,
Atish
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