From: Nikita Shubin <nikita.shubin@maquefel.me>
To: Rick Chen <rickchen36@gmail.com>
Cc: U-Boot Mailing List <u-boot@lists.denx.de>,
linux@yadro.com, Leo Liang <ycliang@andestech.com>,
Simon Glass <sjg@chromium.org>, Bin Meng <bmeng.cn@gmail.com>,
Heinrich Schuchardt <xypron.glpk@gmx.de>,
ilias.apalodimas@linaro.org, mr.nuke.me@gmail.com, afd@ti.com,
alpernebiyasak@gmail.com
Subject: Re: [PATCH v2] spl: introduce SPL_XIP to config
Date: Fri, 2 Sep 2022 11:42:22 +0300 [thread overview]
Message-ID: <20220902114222.637b470c@redslave.neermore.group> (raw)
In-Reply-To: <CAN5B=e+ZCUFMDyPBqvZ_stVSfzG7DiHYkmCXZysrhuJdNmzTEQ@mail.gmail.com>
On Fri, 2 Sep 2022 15:25:06 +0800
Rick Chen <rickchen36@gmail.com> wrote:
Hello Rick!
> Hi Nikita,
>
> > From: Nikita Shubin <nikita.shubin@maquefel.me>
> > Sent: Wednesday, August 31, 2022 3:25 PM
> > To: u-boot@lists.denx.de
> > Cc: linux@yadro.com; Nikita Shubin <n.shubin@yadro.com>; Rick
> > Jian-Zhi Chen(陳建志) <rick@andestech.com>; Leo Yu-Chi
> > Liang(梁育齊) <ycliang@andestech.com>; Simon Glass
> > <sjg@chromium.org>; Bin Meng <bmeng.cn@gmail.com>; Heinrich
> > Schuchardt <xypron.glpk@gmx.de>; Ilias Apalodimas
> > <ilias.apalodimas@linaro.org>; Alexandru Gagniuc
> > <mr.nuke.me@gmail.com>; Andrew Davis <afd@ti.com>; Alper Nebi Yasak
> > <alpernebiyasak@gmail.com> Subject: [PATCH v2] spl: introduce
> > SPL_XIP to config
> >
> > From: Nikita Shubin <n.shubin@yadro.com>
> >
> > U-Boot and SPL don't necessary share the same location, so we might
> > end with U-Boot SPL in read-only memory (XIP) and U-Boot in
> > read-write memory.
> >
> > In case of non XIP boot mode, we rely on such variables as
> > "hart_lottery" and "available_harts_lock" which we use as atomics.
> >
> > The problem is that CONFIG_XIP also propagate to main U-Boot, not
> > only SPL, so we need CONFIG_SPL_XIP to distinguish SPL XIP from
> > other XIP modes.
> >
> > This adds an option special for SPL to behave it in XIP manner and
> > we don't use hart_lottery and available_harts_lock, during start
> > proccess.
> >
> > Signed-off-by: Nikita Shubin <n.shubin@yadro.com>
> > ---
> > v1->v2:
> > Sean Anderson:
> > - used Kconfig description suggested by Sean - indeed more
> > cleaner and understandable ---
> > arch/riscv/cpu/cpu.c | 2 +-
> > arch/riscv/cpu/start.S | 4 ++--
> > arch/riscv/include/asm/global_data.h | 2 +-
> > arch/riscv/lib/asm-offsets.c | 2 +-
> > arch/riscv/lib/smp.c | 2 +-
> > common/spl/Kconfig | 7 +++++++
> > 6 files changed, 13 insertions(+), 6 deletions(-)
> >
> > diff --git a/arch/riscv/cpu/cpu.c b/arch/riscv/cpu/cpu.c index
> > 9f5fa0bcb3..5d8163b19f 100644 --- a/arch/riscv/cpu/cpu.c
> > +++ b/arch/riscv/cpu/cpu.c
> > @@ -19,7 +19,7 @@
> > * The variables here must be stored in the data section since
> > they are used
> > * before the bss section is available.
> > */
> > -#ifndef CONFIG_XIP
> > +#if !CONFIG_IS_ENABLED(XIP)
> > u32 hart_lottery __section(".data") = 0;
> >
> > /*
> > diff --git a/arch/riscv/cpu/start.S b/arch/riscv/cpu/start.S index
> > ac81783a90..c3c859e667 100644 --- a/arch/riscv/cpu/start.S
> > +++ b/arch/riscv/cpu/start.S
> > @@ -122,7 +122,7 @@ call_board_init_f_0:
> > call_harts_early_init:
> > jal harts_early_init
> >
> > -#ifndef CONFIG_XIP
> > +#if !CONFIG_IS_ENABLED(XIP)
> > /*
> > * Pick hart to initialize global data and run U-Boot. The
> > other harts
> > * wait for initialization to complete.
> > @@ -150,7 +150,7 @@ call_harts_early_init:
> > /* save the boot hart id to global_data */
> > SREG tp, GD_BOOT_HART(gp)
> >
> > -#ifndef CONFIG_XIP
> > +#if !CONFIG_IS_ENABLED(XIP)
> > la t0, available_harts_lock
> > amoswap.w.rl zero, zero, 0(t0)
> >
> > diff --git a/arch/riscv/include/asm/global_data.h
> > b/arch/riscv/include/asm/global_data.h index 9a146d1d49..a4d3cf430b
> > 100644 --- a/arch/riscv/include/asm/global_data.h
> > +++ b/arch/riscv/include/asm/global_data.h
> > @@ -30,7 +30,7 @@ int iccm[CONFIG_NR_CPUS]; #if
> > CONFIG_IS_ENABLED(SMP) struct ipi_data ipi[CONFIG_NR_CPUS];
> > #endif
> > -#ifndef CONFIG_XIP
> > +#if !CONFIG_IS_ENABLED(XIP)
> > ulong available_harts;
> > #endif
> > };
> > diff --git a/arch/riscv/lib/asm-offsets.c
> > b/arch/riscv/lib/asm-offsets.c index f1fe089b3d..c4f48c8373 100644
> > --- a/arch/riscv/lib/asm-offsets.c +++
> > b/arch/riscv/lib/asm-offsets.c @@ -16,7 +16,7 @@ int main(void)
> > {
> > DEFINE(GD_BOOT_HART, offsetof(gd_t, arch.boot_hart));
> > DEFINE(GD_FIRMWARE_FDT_ADDR, offsetof(gd_t,
> > arch.firmware_fdt_addr)); -#ifndef CONFIG_XIP +#if
> > !CONFIG_IS_ENABLED(XIP) DEFINE(GD_AVAILABLE_HARTS, offsetof(gd_t,
> > arch.available_harts)); #endif
> >
> > diff --git a/arch/riscv/lib/smp.c b/arch/riscv/lib/smp.c index
> > ba992100ad..f8b756291f 100644 --- a/arch/riscv/lib/smp.c
> > +++ b/arch/riscv/lib/smp.c
> > @@ -45,7 +45,7 @@ static int send_ipi_many(struct ipi_data *ipi,
> > int wait) continue;
> > }
> >
> > -#ifndef CONFIG_XIP
> > +#if !CONFIG_IS_ENABLED(XIP)
> > /* skip if hart is not available */
> > if (!(gd->arch.available_harts & (1 << reg)))
> > continue;
> > diff --git a/common/spl/Kconfig b/common/spl/Kconfig index
> > 07c03d611d..777eff5e47 100644 --- a/common/spl/Kconfig
> > +++ b/common/spl/Kconfig
> > @@ -27,6 +27,13 @@ config SPL_FRAMEWORK
> > supports MMC, NAND and YMODEM and other methods loading
> > of U-Boot and the Linux Kernel. If unsure, say Y.
> >
>
> Would you please move the below SPL_XIP to arch/riscv/Kconfig and
> aside the CONFIG_XIP.
> Since hart_lottery and available_harts_lock only be used by RISC-V
> currently.
>
> And also please help to change CONFIG_XIP to CONFIG_SPL_XIP in the
> following defconfig, or the behavior will be unexpected for AE350.
> ./ae350_rv64_spl_xip_defconfig:CONFIG_XIP=y
> ./ae350_rv32_spl_xip_defconfig:CONFIG_XIP=y
>
No problem. Thanks for catching ae350.
> Other looks great for me.
>
> Thanks,
> Rick
>
> > +config SPL_XIP
> > + bool "Enable XIP mode for SPL"
> > + help
> > + Support booting SPL from read-only memory (such as XIP).
> > Don't rely on
> > + lock variables (for example hart_lottery and
> > available_harts_lock)
> > + since they cannot be modified.
> > +
> > config SPL_FRAMEWORK_BOARD_INIT_F
> > bool "Define a generic function board_init_f"
> > depends on SPL_FRAMEWORK
> > --
> > 2.35.1
next prev parent reply other threads:[~2022-09-02 8:42 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-08-11 9:37 [RFC PATCH 0/1] spl: introduce SPL_XIP to config Nikita Shubin
2022-08-11 9:37 ` [RFC PATCH 1/1] " Nikita Shubin
2022-08-13 4:35 ` Sean Anderson
2022-08-15 7:27 ` Nikita Shubin
2022-08-23 4:25 ` Sean Anderson
2022-08-26 8:44 ` [PATCH] " Nikita Shubin
2022-08-26 14:10 ` Sean Anderson
2022-08-31 7:25 ` [PATCH v2] " Nikita Shubin
[not found] ` <HK0PR03MB2994C85219E6217F7F9F4A05C17A9@HK0PR03MB2994.apcprd03.prod.outlook.com>
2022-09-02 7:25 ` Rick Chen
2022-09-02 8:42 ` Nikita Shubin [this message]
2022-09-02 8:47 ` [PATCH v3] " Nikita Shubin
[not found] ` <HK0PR03MB29942A55774ED60C5568E72CC17F9@HK0PR03MB2994.apcprd03.prod.outlook.com>
2022-09-08 0:45 ` Rick Chen
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