2021-04-28 03:37:35

by Palmer Dabbelt

Subject: [PATCH] RISC-V: Always define XIP_FIXUP

From: Palmer Dabbelt <[email protected]>

XIP depends on MMU, but XIP_FIXUP is defined throughout the kernel in
order to avoid excessive ifdefs. This just makes sure to always define
XIP_FIXIP, which will fix MMU=n builds.

Fixes: 44c922572952 ("RISC-V: enable XIP")
Reported-by: Guenter Roeck <[email protected]>
Signed-off-by: Palmer Dabbelt <[email protected]>
---
arch/riscv/include/asm/pgtable.h | 24 ++++++++++++------------
1 file changed, 12 insertions(+), 12 deletions(-)

diff --git a/arch/riscv/include/asm/pgtable.h b/arch/riscv/include/asm/pgtable.h
index 2f1384e14e31..fd749351f432 100644
--- a/arch/riscv/include/asm/pgtable.h
+++ b/arch/riscv/include/asm/pgtable.h
@@ -73,18 +73,6 @@
#endif
#define FIXADDR_START (FIXADDR_TOP - FIXADDR_SIZE)

-#ifdef CONFIG_XIP_KERNEL
-#define XIP_OFFSET SZ_8M
-#define XIP_FIXUP(addr) ({ \
- uintptr_t __a = (uintptr_t)(addr); \
- (__a >= CONFIG_XIP_PHYS_ADDR && __a < CONFIG_XIP_PHYS_ADDR + SZ_16M) ? \
- __a - CONFIG_XIP_PHYS_ADDR + CONFIG_PHYS_RAM_BASE - XIP_OFFSET :\
- __a; \
- })
-#else
-#define XIP_FIXUP(addr) (addr)
-#endif /* CONFIG_XIP_KERNEL */
-
#endif

#ifndef __ASSEMBLY__
@@ -101,6 +89,18 @@
#include <asm/pgtable-32.h>
#endif /* CONFIG_64BIT */

+#ifdef CONFIG_XIP_KERNEL
+#define XIP_OFFSET SZ_8M
+#define XIP_FIXUP(addr) ({ \
+ uintptr_t __a = (uintptr_t)(addr); \
+ (__a >= CONFIG_XIP_PHYS_ADDR && __a < CONFIG_XIP_PHYS_ADDR + SZ_16M) ? \
+ __a - CONFIG_XIP_PHYS_ADDR + CONFIG_PHYS_RAM_BASE - XIP_OFFSET :\
+ __a; \
+ })
+#else
+#define XIP_FIXUP(addr) (addr)
+#endif /* CONFIG_XIP_KERNEL */
+
#ifdef CONFIG_MMU
/* Number of entries in the page global directory */
#define PTRS_PER_PGD (PAGE_SIZE / sizeof(pgd_t))
--
2.31.1.498.g6c1eba8ee3d-goog

2021-04-28 03:42:26

by Anup Patel

Subject: Re: [PATCH] RISC-V: Always define XIP_FIXUP

On Wed, Apr 28, 2021 at 9:05 AM Palmer Dabbelt <[email protected]> wrote:
>
> From: Palmer Dabbelt <[email protected]>
>
> XIP depends on MMU, but XIP_FIXUP is defined throughout the kernel in
> order to avoid excessive ifdefs. This just makes sure to always define
> XIP_FIXIP, which will fix MMU=n builds.
>
> Fixes: 44c922572952 ("RISC-V: enable XIP")
> Reported-by: Guenter Roeck <[email protected]>
> Signed-off-by: Palmer Dabbelt <[email protected]>

Looks good to me.

Reviewed-by: Anup Patel <[email protected]>

Regards,
Anup

> ---
> arch/riscv/include/asm/pgtable.h | 24 ++++++++++++------------
> 1 file changed, 12 insertions(+), 12 deletions(-)
>
> diff --git a/arch/riscv/include/asm/pgtable.h b/arch/riscv/include/asm/pgtable.h
> index 2f1384e14e31..fd749351f432 100644
> --- a/arch/riscv/include/asm/pgtable.h
> +++ b/arch/riscv/include/asm/pgtable.h
> @@ -73,18 +73,6 @@
> #endif
> #define FIXADDR_START (FIXADDR_TOP - FIXADDR_SIZE)
>
> -#ifdef CONFIG_XIP_KERNEL
> -#define XIP_OFFSET SZ_8M
> -#define XIP_FIXUP(addr) ({ \
> - uintptr_t __a = (uintptr_t)(addr); \
> - (__a >= CONFIG_XIP_PHYS_ADDR && __a < CONFIG_XIP_PHYS_ADDR + SZ_16M) ? \
> - __a - CONFIG_XIP_PHYS_ADDR + CONFIG_PHYS_RAM_BASE - XIP_OFFSET :\
> - __a; \
> - })
> -#else
> -#define XIP_FIXUP(addr) (addr)
> -#endif /* CONFIG_XIP_KERNEL */
> -
> #endif
>
> #ifndef __ASSEMBLY__
> @@ -101,6 +89,18 @@
> #include <asm/pgtable-32.h>
> #endif /* CONFIG_64BIT */
>
> +#ifdef CONFIG_XIP_KERNEL
> +#define XIP_OFFSET SZ_8M
> +#define XIP_FIXUP(addr) ({ \
> + uintptr_t __a = (uintptr_t)(addr); \
> + (__a >= CONFIG_XIP_PHYS_ADDR && __a < CONFIG_XIP_PHYS_ADDR + SZ_16M) ? \
> + __a - CONFIG_XIP_PHYS_ADDR + CONFIG_PHYS_RAM_BASE - XIP_OFFSET :\
> + __a; \
> + })
> +#else
> +#define XIP_FIXUP(addr) (addr)
> +#endif /* CONFIG_XIP_KERNEL */
> +
> #ifdef CONFIG_MMU
> /* Number of entries in the page global directory */
> #define PTRS_PER_PGD (PAGE_SIZE / sizeof(pgd_t))
> --
> 2.31.1.498.g6c1eba8ee3d-goog
>

2021-04-28 04:17:37

by Guenter Roeck

Subject: Re: [PATCH] RISC-V: Always define XIP_FIXUP

On Tue, Apr 27, 2021 at 08:34:15PM -0700, Palmer Dabbelt wrote:
> From: Palmer Dabbelt <[email protected]>
>
> XIP depends on MMU, but XIP_FIXUP is defined throughout the kernel in
> order to avoid excessive ifdefs. This just makes sure to always define
> XIP_FIXIP, which will fix MMU=n builds.
>
> Fixes: 44c922572952 ("RISC-V: enable XIP")
> Reported-by: Guenter Roeck <[email protected]>
> Signed-off-by: Palmer Dabbelt <[email protected]>

Tested-by: Guenter Roeck <[email protected]>

Guenter

> ---
> arch/riscv/include/asm/pgtable.h | 24 ++++++++++++------------
> 1 file changed, 12 insertions(+), 12 deletions(-)
>
> diff --git a/arch/riscv/include/asm/pgtable.h b/arch/riscv/include/asm/pgtable.h
> index 2f1384e14e31..fd749351f432 100644
> --- a/arch/riscv/include/asm/pgtable.h
> +++ b/arch/riscv/include/asm/pgtable.h
> @@ -73,18 +73,6 @@
> #endif
> #define FIXADDR_START (FIXADDR_TOP - FIXADDR_SIZE)
>
> -#ifdef CONFIG_XIP_KERNEL
> -#define XIP_OFFSET SZ_8M
> -#define XIP_FIXUP(addr) ({ \
> - uintptr_t __a = (uintptr_t)(addr); \
> - (__a >= CONFIG_XIP_PHYS_ADDR && __a < CONFIG_XIP_PHYS_ADDR + SZ_16M) ? \
> - __a - CONFIG_XIP_PHYS_ADDR + CONFIG_PHYS_RAM_BASE - XIP_OFFSET :\
> - __a; \
> - })
> -#else
> -#define XIP_FIXUP(addr) (addr)
> -#endif /* CONFIG_XIP_KERNEL */
> -
> #endif
>
> #ifndef __ASSEMBLY__
> @@ -101,6 +89,18 @@
> #include <asm/pgtable-32.h>
> #endif /* CONFIG_64BIT */
>
> +#ifdef CONFIG_XIP_KERNEL
> +#define XIP_OFFSET SZ_8M
> +#define XIP_FIXUP(addr) ({ \
> + uintptr_t __a = (uintptr_t)(addr); \
> + (__a >= CONFIG_XIP_PHYS_ADDR && __a < CONFIG_XIP_PHYS_ADDR + SZ_16M) ? \
> + __a - CONFIG_XIP_PHYS_ADDR + CONFIG_PHYS_RAM_BASE - XIP_OFFSET :\
> + __a; \
> + })
> +#else
> +#define XIP_FIXUP(addr) (addr)
> +#endif /* CONFIG_XIP_KERNEL */
> +
> #ifdef CONFIG_MMU
> /* Number of entries in the page global directory */
> #define PTRS_PER_PGD (PAGE_SIZE / sizeof(pgd_t))
> --
> 2.31.1.498.g6c1eba8ee3d-goog
>

2021-04-28 08:26:56

by Alexandre Ghiti

Subject: Re: [PATCH] RISC-V: Always define XIP_FIXUP

Le 4/27/21 ? 11:34 PM, Palmer Dabbelt a ?crit?:
> From: Palmer Dabbelt <[email protected]>
>
> XIP depends on MMU, but XIP_FIXUP is defined throughout the kernel in
> order to avoid excessive ifdefs. This just makes sure to always define
> XIP_FIXIP, which will fix MMU=n builds.

A small typo here.

>
> Fixes: 44c922572952 ("RISC-V: enable XIP")
> Reported-by: Guenter Roeck <[email protected]>
> Signed-off-by: Palmer Dabbelt <[email protected]>
> ---
> arch/riscv/include/asm/pgtable.h | 24 ++++++++++++------------
> 1 file changed, 12 insertions(+), 12 deletions(-)
>
> diff --git a/arch/riscv/include/asm/pgtable.h b/arch/riscv/include/asm/pgtable.h
> index 2f1384e14e31..fd749351f432 100644
> --- a/arch/riscv/include/asm/pgtable.h
> +++ b/arch/riscv/include/asm/pgtable.h
> @@ -73,18 +73,6 @@
> #endif
> #define FIXADDR_START (FIXADDR_TOP - FIXADDR_SIZE)
>
> -#ifdef CONFIG_XIP_KERNEL
> -#define XIP_OFFSET SZ_8M
> -#define XIP_FIXUP(addr) ({ \
> - uintptr_t __a = (uintptr_t)(addr); \
> - (__a >= CONFIG_XIP_PHYS_ADDR && __a < CONFIG_XIP_PHYS_ADDR + SZ_16M) ? \
> - __a - CONFIG_XIP_PHYS_ADDR + CONFIG_PHYS_RAM_BASE - XIP_OFFSET :\
> - __a; \
> - })
> -#else
> -#define XIP_FIXUP(addr) (addr)
> -#endif /* CONFIG_XIP_KERNEL */
> -
> #endif
>
> #ifndef __ASSEMBLY__
> @@ -101,6 +89,18 @@
> #include <asm/pgtable-32.h>
> #endif /* CONFIG_64BIT */
>
> +#ifdef CONFIG_XIP_KERNEL
> +#define XIP_OFFSET SZ_8M


XIP_OFFSET is used in head.S and then this breaks XIP_KERNEL. XIP_OFFSET
must live outside the ifndef __ASSEMBLY__.


> +#define XIP_FIXUP(addr) ({ \
> + uintptr_t __a = (uintptr_t)(addr); \
> + (__a >= CONFIG_XIP_PHYS_ADDR && __a < CONFIG_XIP_PHYS_ADDR + SZ_16M) ? \
> + __a - CONFIG_XIP_PHYS_ADDR + CONFIG_PHYS_RAM_BASE - XIP_OFFSET :\
> + __a; \
> + })
> +#else
> +#define XIP_FIXUP(addr) (addr)
> +#endif /* CONFIG_XIP_KERNEL */
> +
> #ifdef CONFIG_MMU
> /* Number of entries in the page global directory */
> #define PTRS_PER_PGD (PAGE_SIZE / sizeof(pgd_t))
>

Thank you for doing that!

Alex

2021-04-29 04:44:15

by Palmer Dabbelt

Subject: Re: [PATCH] RISC-V: Always define XIP_FIXUP

On Wed, 28 Apr 2021 01:25:55 PDT (-0700), [email protected] wrote:
> Le 4/27/21 à 11:34 PM, Palmer Dabbelt a écrit :
>> From: Palmer Dabbelt <[email protected]>
>>
>> XIP depends on MMU, but XIP_FIXUP is defined throughout the kernel in
>> order to avoid excessive ifdefs. This just makes sure to always define
>> XIP_FIXIP, which will fix MMU=n builds.
>
> A small typo here.

Actually two: "defined" should have been "used". Both are fixed.

>
>>
>> Fixes: 44c922572952 ("RISC-V: enable XIP")
>> Reported-by: Guenter Roeck <[email protected]>
>> Signed-off-by: Palmer Dabbelt <[email protected]>
>> ---
>> arch/riscv/include/asm/pgtable.h | 24 ++++++++++++------------
>> 1 file changed, 12 insertions(+), 12 deletions(-)
>>
>> diff --git a/arch/riscv/include/asm/pgtable.h b/arch/riscv/include/asm/pgtable.h
>> index 2f1384e14e31..fd749351f432 100644
>> --- a/arch/riscv/include/asm/pgtable.h
>> +++ b/arch/riscv/include/asm/pgtable.h
>> @@ -73,18 +73,6 @@
>> #endif
>> #define FIXADDR_START (FIXADDR_TOP - FIXADDR_SIZE)
>>
>> -#ifdef CONFIG_XIP_KERNEL
>> -#define XIP_OFFSET SZ_8M
>> -#define XIP_FIXUP(addr) ({ \
>> - uintptr_t __a = (uintptr_t)(addr); \
>> - (__a >= CONFIG_XIP_PHYS_ADDR && __a < CONFIG_XIP_PHYS_ADDR + SZ_16M) ? \
>> - __a - CONFIG_XIP_PHYS_ADDR + CONFIG_PHYS_RAM_BASE - XIP_OFFSET :\
>> - __a; \
>> - })
>> -#else
>> -#define XIP_FIXUP(addr) (addr)
>> -#endif /* CONFIG_XIP_KERNEL */
>> -
>> #endif
>>
>> #ifndef __ASSEMBLY__
>> @@ -101,6 +89,18 @@
>> #include <asm/pgtable-32.h>
>> #endif /* CONFIG_64BIT */
>>
>> +#ifdef CONFIG_XIP_KERNEL
>> +#define XIP_OFFSET SZ_8M
>
>
> XIP_OFFSET is used in head.S and then this breaks XIP_KERNEL. XIP_OFFSET
> must live outside the ifndef __ASSEMBLY__.

Thanks, I hadn't even seen XIP_OFFSET. This is fixed in the v2.

Do you have an XIP config that will run on QEMU, and a way to run it?
If so, can you post a defconfig and some instructions? That'll make it
easier to test on my end.

>> +#define XIP_FIXUP(addr) ({ \
>> + uintptr_t __a = (uintptr_t)(addr); \
>> + (__a >= CONFIG_XIP_PHYS_ADDR && __a < CONFIG_XIP_PHYS_ADDR + SZ_16M) ? \
>> + __a - CONFIG_XIP_PHYS_ADDR + CONFIG_PHYS_RAM_BASE - XIP_OFFSET :\
>> + __a; \
>> + })
>> +#else
>> +#define XIP_FIXUP(addr) (addr)
>> +#endif /* CONFIG_XIP_KERNEL */
>> +
>> #ifdef CONFIG_MMU
>> /* Number of entries in the page global directory */
>> #define PTRS_PER_PGD (PAGE_SIZE / sizeof(pgd_t))
>>
>
> Thank you for doing that!
>
> Alex

2021-04-29 13:34:23

by Alexandre Ghiti

Subject: Re: [PATCH] RISC-V: Always define XIP_FIXUP

Le 4/29/21 à 12:43 AM, Palmer Dabbelt a écrit :
> On Wed, 28 Apr 2021 01:25:55 PDT (-0700), [email protected] wrote:
>> Le 4/27/21 à 11:34 PM, Palmer Dabbelt a écrit :
>>> From: Palmer Dabbelt <[email protected]>
>>>
>>> XIP depends on MMU, but XIP_FIXUP is defined throughout the kernel in
>>> order to avoid excessive ifdefs.  This just makes sure to always define
>>> XIP_FIXIP, which will fix MMU=n builds.
>>
>> A small typo here.
>
> Actually two: "defined" should have been "used".  Both are fixed.
>
>>
>>>
>>> Fixes: 44c922572952 ("RISC-V: enable XIP")
>>> Reported-by: Guenter Roeck <[email protected]>
>>> Signed-off-by: Palmer Dabbelt <[email protected]>
>>> ---
>>>   arch/riscv/include/asm/pgtable.h | 24 ++++++++++++------------
>>>   1 file changed, 12 insertions(+), 12 deletions(-)
>>>
>>> diff --git a/arch/riscv/include/asm/pgtable.h
>>> b/arch/riscv/include/asm/pgtable.h
>>> index 2f1384e14e31..fd749351f432 100644
>>> --- a/arch/riscv/include/asm/pgtable.h
>>> +++ b/arch/riscv/include/asm/pgtable.h
>>> @@ -73,18 +73,6 @@
>>>   #endif
>>>   #define FIXADDR_START    (FIXADDR_TOP - FIXADDR_SIZE)
>>>
>>> -#ifdef CONFIG_XIP_KERNEL
>>> -#define XIP_OFFSET        SZ_8M
>>> -#define XIP_FIXUP(addr) ({                            \
>>> -    uintptr_t __a = (uintptr_t)(addr);                    \
>>> -    (__a >= CONFIG_XIP_PHYS_ADDR && __a < CONFIG_XIP_PHYS_ADDR +
>>> SZ_16M) ?    \
>>> -        __a - CONFIG_XIP_PHYS_ADDR + CONFIG_PHYS_RAM_BASE -
>>> XIP_OFFSET :\
>>> -        __a;                                \
>>> -    })
>>> -#else
>>> -#define XIP_FIXUP(addr)        (addr)
>>> -#endif /* CONFIG_XIP_KERNEL */
>>> -
>>>   #endif
>>>
>>>   #ifndef __ASSEMBLY__
>>> @@ -101,6 +89,18 @@
>>>   #include <asm/pgtable-32.h>
>>>   #endif /* CONFIG_64BIT */
>>>
>>> +#ifdef CONFIG_XIP_KERNEL
>>> +#define XIP_OFFSET        SZ_8M
>>
>>
>> XIP_OFFSET is used in head.S and then this breaks XIP_KERNEL. XIP_OFFSET
>> must live outside the ifndef __ASSEMBLY__.
>
> Thanks, I hadn't even seen XIP_OFFSET.  This is fixed in the v2.
>
> Do you have an XIP config that will run on QEMU, and a way to run it? If
> so, can you post a defconfig and some instructions?  That'll make it
> easier to test on my end.
>

Yes, I'll do that later today or tomorrow.

>>> +#define XIP_FIXUP(addr) ({                            \
>>> +    uintptr_t __a = (uintptr_t)(addr);                    \
>>> +    (__a >= CONFIG_XIP_PHYS_ADDR && __a < CONFIG_XIP_PHYS_ADDR +
>>> SZ_16M) ?    \
>>> +        __a - CONFIG_XIP_PHYS_ADDR + CONFIG_PHYS_RAM_BASE -
>>> XIP_OFFSET :\
>>> +        __a;                                \
>>> +    })
>>> +#else
>>> +#define XIP_FIXUP(addr)        (addr)
>>> +#endif /* CONFIG_XIP_KERNEL */
>>> +
>>>   #ifdef CONFIG_MMU
>>>   /* Number of entries in the page global directory */
>>>   #define PTRS_PER_PGD    (PAGE_SIZE / sizeof(pgd_t))
>>>
>>
>> Thank you for doing that!
>>
>> Alex
>
> _______________________________________________
> linux-riscv mailing list
> [email protected]
> http://lists.infradead.org/mailman/listinfo/linux-riscv

2021-05-02 08:42:11

by Alexandre Ghiti

Subject: Re: [PATCH] RISC-V: Always define XIP_FIXUP

Hi Palmer,

Le 4/29/21 à 12:43 AM, Palmer Dabbelt a écrit :
> On Wed, 28 Apr 2021 01:25:55 PDT (-0700), [email protected] wrote:
>> Le 4/27/21 à 11:34 PM, Palmer Dabbelt a écrit :
>>> From: Palmer Dabbelt <[email protected]>
>>>
>>> XIP depends on MMU, but XIP_FIXUP is defined throughout the kernel in
>>> order to avoid excessive ifdefs.  This just makes sure to always define
>>> XIP_FIXIP, which will fix MMU=n builds.
>>
>> A small typo here.
>
> Actually two: "defined" should have been "used".  Both are fixed.
>
>>
>>>
>>> Fixes: 44c922572952 ("RISC-V: enable XIP")
>>> Reported-by: Guenter Roeck <[email protected]>
>>> Signed-off-by: Palmer Dabbelt <[email protected]>
>>> ---
>>>   arch/riscv/include/asm/pgtable.h | 24 ++++++++++++------------
>>>   1 file changed, 12 insertions(+), 12 deletions(-)
>>>
>>> diff --git a/arch/riscv/include/asm/pgtable.h
>>> b/arch/riscv/include/asm/pgtable.h
>>> index 2f1384e14e31..fd749351f432 100644
>>> --- a/arch/riscv/include/asm/pgtable.h
>>> +++ b/arch/riscv/include/asm/pgtable.h
>>> @@ -73,18 +73,6 @@
>>>   #endif
>>>   #define FIXADDR_START    (FIXADDR_TOP - FIXADDR_SIZE)
>>>
>>> -#ifdef CONFIG_XIP_KERNEL
>>> -#define XIP_OFFSET        SZ_8M
>>> -#define XIP_FIXUP(addr) ({                            \
>>> -    uintptr_t __a = (uintptr_t)(addr);                    \
>>> -    (__a >= CONFIG_XIP_PHYS_ADDR && __a < CONFIG_XIP_PHYS_ADDR +
>>> SZ_16M) ?    \
>>> -        __a - CONFIG_XIP_PHYS_ADDR + CONFIG_PHYS_RAM_BASE -
>>> XIP_OFFSET :\
>>> -        __a;                                \
>>> -    })
>>> -#else
>>> -#define XIP_FIXUP(addr)        (addr)
>>> -#endif /* CONFIG_XIP_KERNEL */
>>> -
>>>   #endif
>>>
>>>   #ifndef __ASSEMBLY__
>>> @@ -101,6 +89,18 @@
>>>   #include <asm/pgtable-32.h>
>>>   #endif /* CONFIG_64BIT */
>>>
>>> +#ifdef CONFIG_XIP_KERNEL
>>> +#define XIP_OFFSET        SZ_8M
>>
>>
>> XIP_OFFSET is used in head.S and then this breaks XIP_KERNEL. XIP_OFFSET
>> must live outside the ifndef __ASSEMBLY__.
>
> Thanks, I hadn't even seen XIP_OFFSET.  This is fixed in the v2.
>
> Do you have an XIP config that will run on QEMU, and a way to run it? If
> so, can you post a defconfig and some instructions?  That'll make it
> easier to test on my end.


I posted a tutorial here on how I test XIP kernel:

https://alexghiti.github.io/xip/XIP.html

If something does not work for you, please tell me.

Alex

>
>>> +#define XIP_FIXUP(addr) ({                            \
>>> +    uintptr_t __a = (uintptr_t)(addr);                    \
>>> +    (__a >= CONFIG_XIP_PHYS_ADDR && __a < CONFIG_XIP_PHYS_ADDR +
>>> SZ_16M) ?    \
>>> +        __a - CONFIG_XIP_PHYS_ADDR + CONFIG_PHYS_RAM_BASE -
>>> XIP_OFFSET :\
>>> +        __a;                                \
>>> +    })
>>> +#else
>>> +#define XIP_FIXUP(addr)        (addr)
>>> +#endif /* CONFIG_XIP_KERNEL */
>>> +
>>>   #ifdef CONFIG_MMU
>>>   /* Number of entries in the page global directory */
>>>   #define PTRS_PER_PGD    (PAGE_SIZE / sizeof(pgd_t))
>>>
>>
>> Thank you for doing that!
>>
>> Alex
>
> _______________________________________________
> linux-riscv mailing list
> [email protected]
> http://lists.infradead.org/mailman/listinfo/linux-riscv