Re: [PATCH] Implement ioremap_prot support (v2)

From: Conor Dooley
Date: Fri Dec 02 2022 - 05:37:02 EST


Hello!

On Fri, Dec 02, 2022 at 04:33:56PM +0800, Jianwen Jiang wrote:a
> [PATCH] Implement ioremap_prot support (v2)

Some process bits.. Please put the v2 inside the leading [], git
format-patch will do this for you with the `-v N` arg. Also, please add
a subsytem prefix to the $subject & drop the leading spaces.

> Feature ioremap_prot only needs an implementation of pte_pgprot on riscv.

There's also no need to tab this stuff in

> That macro is similar to the same one on platform loongarch, mips and sh.
> We just need:
> 1. replace _PFN_MASK with _PAGE_PFN_MASK in pte_gpprot;
> 2. add "select HAVE_IOREMAP_PROT" into arch/riscv/Kconfig;
> 3. add "depends on MMU" into drivers/fpga/Kconfig to fix the building error "undefined reference to generic_access_phys".
>
> Signed-off-by: Jianwen Jiang <jiangjianwen@xxxxxxxxxxxxx>

And this line should not be tabbed in.

> ---
> arch/riscv/Kconfig | 1 +
> arch/riscv/include/asm/page.h | 2 ++
> drivers/fpga/Kconfig | 1 +

This needs to go as a separate patch to the FPGA subsystem, with the
FPGA maintainers in to/cc.

> 3 files changed, 4 insertions(+)
>
> diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
> index fa78595a6089..5ed2c7361040 100644
> --- a/arch/riscv/Kconfig
> +++ b/arch/riscv/Kconfig
> @@ -95,6 +95,7 @@ config RISCV
> select HAVE_FUNCTION_ERROR_INJECTION
> select HAVE_GCC_PLUGINS
> select HAVE_GENERIC_VDSO if MMU && 64BIT
> + select HAVE_IOREMAP_PROT
> select HAVE_IRQ_TIME_ACCOUNTING
> select HAVE_KPROBES if !XIP_KERNEL
> select HAVE_KPROBES_ON_FTRACE if !XIP_KERNEL
> diff --git a/arch/riscv/include/asm/page.h b/arch/riscv/include/asm/page.h
> index ac70b0fd9a9a..cb08a4911d60 100644
> --- a/arch/riscv/include/asm/page.h
> +++ b/arch/riscv/include/asm/page.h
> @@ -84,6 +84,8 @@ typedef struct page *pgtable_t;
> #define __pgd(x) ((pgd_t) { (x) })
> #define __pgprot(x) ((pgprot_t) { (x) })
>
> +#define pte_pgprot(x) __pgprot(pte_val(x) & ~_PAGE_PFN_MASK)
> +
> #ifdef CONFIG_64BIT
> #define PTE_FMT "%016lx"
> #else
> diff --git a/drivers/fpga/Kconfig b/drivers/fpga/Kconfig
> index bbe0a7cabb75..0493272b8bff 100644
> --- a/drivers/fpga/Kconfig
> +++ b/drivers/fpga/Kconfig
> @@ -5,6 +5,7 @@
>
> menuconfig FPGA
> tristate "FPGA Configuration Framework"
> + depends on MMU

How come no other arch needs this dependancy?

Thanks,
Conor.

> help
> Say Y here if you want support for configuring FPGAs from the
> kernel. The FPGA framework adds an FPGA manager class and FPGA
> --
> 2.37.3.446.gd42b38dfb5
>
>
> _______________________________________________
> linux-riscv mailing list
> linux-riscv@xxxxxxxxxxxxxxxxxxx
> http://lists.infradead.org/mailman/listinfo/linux-riscv

Attachment: signature.asc
Description: PGP signature