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* [PATCH v3 1/3] riscv: Improve PTDUMP to show RSW with non-zero value
@ 2023-09-20  3:55 Yu Chien Peter Lin
  2023-09-20  3:55 ` [PATCH v3 2/3] riscv: Introduce PBMT field to PTDUMP Yu Chien Peter Lin
                   ` (3 more replies)
  0 siblings, 4 replies; 8+ messages in thread
From: Yu Chien Peter Lin @ 2023-09-20  3:55 UTC (permalink / raw)
  To: paul.walmsley, palmer, aou, david, akpm, alexghiti, bjorn,
	linux-riscv, linux-kernel
  Cc: conor.dooley, Yu Chien Peter Lin

RSW field can be used to encode 2 bits of software
defined information. Currently, PTDUMP only prints
"RSW" when its value is 1 or 3.

To fix this issue and improve the debugging experience
with PTDUMP, we redefine _PAGE_SPECIAL to its original
value and use _PAGE_SOFT as the RSW mask, allow it to
print the RSW with any non-zero value.

This patch also removes the val from the struct prot_bits
as it is no longer needed.

Signed-off-by: Yu Chien Peter Lin <peterlin@andestech.com>
---
Changes v1 -> v2
- Redefine _PAGE_SPECIAL to (1 << 8)
Changes v2 -> v3
- Add commet for _PAGE_SPECIAL
- Add ".." when RSW field is clear
- Fix unbalanced braces warning
---
 arch/riscv/include/asm/pgtable-bits.h |  4 +--
 arch/riscv/mm/ptdump.c                | 35 ++++++++++++---------------
 2 files changed, 17 insertions(+), 22 deletions(-)

diff --git a/arch/riscv/include/asm/pgtable-bits.h b/arch/riscv/include/asm/pgtable-bits.h
index f896708e8331..179bd4afece4 100644
--- a/arch/riscv/include/asm/pgtable-bits.h
+++ b/arch/riscv/include/asm/pgtable-bits.h
@@ -16,9 +16,9 @@
 #define _PAGE_GLOBAL    (1 << 5)    /* Global */
 #define _PAGE_ACCESSED  (1 << 6)    /* Set by hardware on any access */
 #define _PAGE_DIRTY     (1 << 7)    /* Set by hardware on any write */
-#define _PAGE_SOFT      (1 << 8)    /* Reserved for software */
+#define _PAGE_SOFT      (3 << 8)    /* Reserved for software */
 
-#define _PAGE_SPECIAL   _PAGE_SOFT
+#define _PAGE_SPECIAL   (1 << 8)    /* RSW: 0x1 */
 #define _PAGE_TABLE     _PAGE_PRESENT
 
 /*
diff --git a/arch/riscv/mm/ptdump.c b/arch/riscv/mm/ptdump.c
index 20a9f991a6d7..57a0926c6627 100644
--- a/arch/riscv/mm/ptdump.c
+++ b/arch/riscv/mm/ptdump.c
@@ -129,7 +129,6 @@ static struct ptd_mm_info efi_ptd_info = {
 /* Page Table Entry */
 struct prot_bits {
 	u64 mask;
-	u64 val;
 	const char *set;
 	const char *clear;
 };
@@ -137,47 +136,38 @@ struct prot_bits {
 static const struct prot_bits pte_bits[] = {
 	{
 		.mask = _PAGE_SOFT,
-		.val = _PAGE_SOFT,
-		.set = "RSW",
-		.clear = "   ",
+		.set = "RSW(%d)",
+		.clear = "  ..  ",
 	}, {
 		.mask = _PAGE_DIRTY,
-		.val = _PAGE_DIRTY,
 		.set = "D",
 		.clear = ".",
 	}, {
 		.mask = _PAGE_ACCESSED,
-		.val = _PAGE_ACCESSED,
 		.set = "A",
 		.clear = ".",
 	}, {
 		.mask = _PAGE_GLOBAL,
-		.val = _PAGE_GLOBAL,
 		.set = "G",
 		.clear = ".",
 	}, {
 		.mask = _PAGE_USER,
-		.val = _PAGE_USER,
 		.set = "U",
 		.clear = ".",
 	}, {
 		.mask = _PAGE_EXEC,
-		.val = _PAGE_EXEC,
 		.set = "X",
 		.clear = ".",
 	}, {
 		.mask = _PAGE_WRITE,
-		.val = _PAGE_WRITE,
 		.set = "W",
 		.clear = ".",
 	}, {
 		.mask = _PAGE_READ,
-		.val = _PAGE_READ,
 		.set = "R",
 		.clear = ".",
 	}, {
 		.mask = _PAGE_PRESENT,
-		.val = _PAGE_PRESENT,
 		.set = "V",
 		.clear = ".",
 	}
@@ -208,15 +198,20 @@ static void dump_prot(struct pg_state *st)
 	unsigned int i;
 
 	for (i = 0; i < ARRAY_SIZE(pte_bits); i++) {
-		const char *s;
-
-		if ((st->current_prot & pte_bits[i].mask) == pte_bits[i].val)
-			s = pte_bits[i].set;
-		else
-			s = pte_bits[i].clear;
+		char s[7];
+		unsigned long val;
+
+		val = st->current_prot & pte_bits[i].mask;
+		if (val) {
+			if (pte_bits[i].mask == _PAGE_SOFT)
+				sprintf(s, pte_bits[i].set, val >> 8);
+			else
+				sprintf(s, "%s", pte_bits[i].set);
+		} else {
+			sprintf(s, "%s", pte_bits[i].clear);
+		}
 
-		if (s)
-			pt_dump_seq_printf(st->seq, " %s", s);
+		pt_dump_seq_printf(st->seq, " %s", s);
 	}
 }
 
-- 
2.34.1


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^ permalink raw reply related	[flat|nested] 8+ messages in thread

* [PATCH v3 2/3] riscv: Introduce PBMT field to PTDUMP
  2023-09-20  3:55 [PATCH v3 1/3] riscv: Improve PTDUMP to show RSW with non-zero value Yu Chien Peter Lin
@ 2023-09-20  3:55 ` Yu Chien Peter Lin
  2023-09-20  9:12   ` Alexandre Ghiti
  2023-09-20  3:55 ` [PATCH v3 3/3] riscv: Introduce NAPOT " Yu Chien Peter Lin
                   ` (2 subsequent siblings)
  3 siblings, 1 reply; 8+ messages in thread
From: Yu Chien Peter Lin @ 2023-09-20  3:55 UTC (permalink / raw)
  To: paul.walmsley, palmer, aou, david, akpm, alexghiti, bjorn,
	linux-riscv, linux-kernel
  Cc: conor.dooley, Yu Chien Peter Lin

This patch introduces the PBMT field to the PTDUMP, so it can
display the memory attributes for NC or IO.

Signed-off-by: Yu Chien Peter Lin <peterlin@andestech.com>
---
Changes v1 -> v2
- no change
Changes v2 -> v3
- Add ".." when PBMT field is clear
---
 arch/riscv/mm/ptdump.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/arch/riscv/mm/ptdump.c b/arch/riscv/mm/ptdump.c
index 57a0926c6627..13997cf3fe36 100644
--- a/arch/riscv/mm/ptdump.c
+++ b/arch/riscv/mm/ptdump.c
@@ -135,6 +135,12 @@ struct prot_bits {
 
 static const struct prot_bits pte_bits[] = {
 	{
+#ifdef CONFIG_64BIT
+		.mask = _PAGE_MTMASK_SVPBMT,
+		.set = "MT(%s)",
+		.clear = "  ..  ",
+	}, {
+#endif
 		.mask = _PAGE_SOFT,
 		.set = "RSW(%d)",
 		.clear = "  ..  ",
@@ -205,6 +211,16 @@ static void dump_prot(struct pg_state *st)
 		if (val) {
 			if (pte_bits[i].mask == _PAGE_SOFT)
 				sprintf(s, pte_bits[i].set, val >> 8);
+#ifdef CONFIG_64BIT
+			else if (pte_bits[i].mask == _PAGE_MTMASK_SVPBMT) {
+				if (val == _PAGE_NOCACHE_SVPBMT)
+					sprintf(s, pte_bits[i].set, "NC");
+				else if (val == _PAGE_IO_SVPBMT)
+					sprintf(s, pte_bits[i].set, "IO");
+				else
+					sprintf(s, pte_bits[i].set, "??");
+			}
+#endif
 			else
 				sprintf(s, "%s", pte_bits[i].set);
 		} else {
-- 
2.34.1


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^ permalink raw reply related	[flat|nested] 8+ messages in thread

* [PATCH v3 3/3] riscv: Introduce NAPOT field to PTDUMP
  2023-09-20  3:55 [PATCH v3 1/3] riscv: Improve PTDUMP to show RSW with non-zero value Yu Chien Peter Lin
  2023-09-20  3:55 ` [PATCH v3 2/3] riscv: Introduce PBMT field to PTDUMP Yu Chien Peter Lin
@ 2023-09-20  3:55 ` Yu Chien Peter Lin
  2023-09-20  9:14   ` Alexandre Ghiti
  2023-09-20  9:10 ` [PATCH v3 1/3] riscv: Improve PTDUMP to show RSW with non-zero value Alexandre Ghiti
  2023-09-20  9:55 ` Conor Dooley
  3 siblings, 1 reply; 8+ messages in thread
From: Yu Chien Peter Lin @ 2023-09-20  3:55 UTC (permalink / raw)
  To: paul.walmsley, palmer, aou, david, akpm, alexghiti, bjorn,
	linux-riscv, linux-kernel
  Cc: conor.dooley, Yu Chien Peter Lin

This patch introduces the NAPOT field to PTDUMP, allowing it
to display the letter "N" for pages that have the 63rd bit set.

Signed-off-by: Yu Chien Peter Lin <peterlin@andestech.com>
---
Changes v1 -> v3
- no change
---
 arch/riscv/mm/ptdump.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/riscv/mm/ptdump.c b/arch/riscv/mm/ptdump.c
index 13997cf3fe36..b71f08b91e53 100644
--- a/arch/riscv/mm/ptdump.c
+++ b/arch/riscv/mm/ptdump.c
@@ -136,6 +136,10 @@ struct prot_bits {
 static const struct prot_bits pte_bits[] = {
 	{
 #ifdef CONFIG_64BIT
+		.mask = _PAGE_NAPOT,
+		.set = "N",
+		.clear = ".",
+	}, {
 		.mask = _PAGE_MTMASK_SVPBMT,
 		.set = "MT(%s)",
 		.clear = "  ..  ",
-- 
2.34.1


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^ permalink raw reply related	[flat|nested] 8+ messages in thread

* Re: [PATCH v3 1/3] riscv: Improve PTDUMP to show RSW with non-zero value
  2023-09-20  3:55 [PATCH v3 1/3] riscv: Improve PTDUMP to show RSW with non-zero value Yu Chien Peter Lin
  2023-09-20  3:55 ` [PATCH v3 2/3] riscv: Introduce PBMT field to PTDUMP Yu Chien Peter Lin
  2023-09-20  3:55 ` [PATCH v3 3/3] riscv: Introduce NAPOT " Yu Chien Peter Lin
@ 2023-09-20  9:10 ` Alexandre Ghiti
  2023-09-20  9:55 ` Conor Dooley
  3 siblings, 0 replies; 8+ messages in thread
From: Alexandre Ghiti @ 2023-09-20  9:10 UTC (permalink / raw)
  To: Yu Chien Peter Lin, paul.walmsley, palmer, aou, david, akpm,
	alexghiti, bjorn, linux-riscv, linux-kernel
  Cc: conor.dooley

Hi,

On 20/09/2023 05:55, Yu Chien Peter Lin wrote:
> RSW field can be used to encode 2 bits of software
> defined information. Currently, PTDUMP only prints
> "RSW" when its value is 1 or 3.
>
> To fix this issue and improve the debugging experience
> with PTDUMP, we redefine _PAGE_SPECIAL to its original
> value and use _PAGE_SOFT as the RSW mask, allow it to
> print the RSW with any non-zero value.
>
> This patch also removes the val from the struct prot_bits
> as it is no longer needed.
>
> Signed-off-by: Yu Chien Peter Lin <peterlin@andestech.com>
> ---
> Changes v1 -> v2
> - Redefine _PAGE_SPECIAL to (1 << 8)
> Changes v2 -> v3
> - Add commet for _PAGE_SPECIAL
> - Add ".." when RSW field is clear
> - Fix unbalanced braces warning
> ---
>   arch/riscv/include/asm/pgtable-bits.h |  4 +--
>   arch/riscv/mm/ptdump.c                | 35 ++++++++++++---------------
>   2 files changed, 17 insertions(+), 22 deletions(-)
>
> diff --git a/arch/riscv/include/asm/pgtable-bits.h b/arch/riscv/include/asm/pgtable-bits.h
> index f896708e8331..179bd4afece4 100644
> --- a/arch/riscv/include/asm/pgtable-bits.h
> +++ b/arch/riscv/include/asm/pgtable-bits.h
> @@ -16,9 +16,9 @@
>   #define _PAGE_GLOBAL    (1 << 5)    /* Global */
>   #define _PAGE_ACCESSED  (1 << 6)    /* Set by hardware on any access */
>   #define _PAGE_DIRTY     (1 << 7)    /* Set by hardware on any write */
> -#define _PAGE_SOFT      (1 << 8)    /* Reserved for software */
> +#define _PAGE_SOFT      (3 << 8)    /* Reserved for software */
>   
> -#define _PAGE_SPECIAL   _PAGE_SOFT
> +#define _PAGE_SPECIAL   (1 << 8)    /* RSW: 0x1 */
>   #define _PAGE_TABLE     _PAGE_PRESENT
>   
>   /*
> diff --git a/arch/riscv/mm/ptdump.c b/arch/riscv/mm/ptdump.c
> index 20a9f991a6d7..57a0926c6627 100644
> --- a/arch/riscv/mm/ptdump.c
> +++ b/arch/riscv/mm/ptdump.c
> @@ -129,7 +129,6 @@ static struct ptd_mm_info efi_ptd_info = {
>   /* Page Table Entry */
>   struct prot_bits {
>   	u64 mask;
> -	u64 val;
>   	const char *set;
>   	const char *clear;
>   };
> @@ -137,47 +136,38 @@ struct prot_bits {
>   static const struct prot_bits pte_bits[] = {
>   	{
>   		.mask = _PAGE_SOFT,
> -		.val = _PAGE_SOFT,
> -		.set = "RSW",
> -		.clear = "   ",
> +		.set = "RSW(%d)",
> +		.clear = "  ..  ",
>   	}, {
>   		.mask = _PAGE_DIRTY,
> -		.val = _PAGE_DIRTY,
>   		.set = "D",
>   		.clear = ".",
>   	}, {
>   		.mask = _PAGE_ACCESSED,
> -		.val = _PAGE_ACCESSED,
>   		.set = "A",
>   		.clear = ".",
>   	}, {
>   		.mask = _PAGE_GLOBAL,
> -		.val = _PAGE_GLOBAL,
>   		.set = "G",
>   		.clear = ".",
>   	}, {
>   		.mask = _PAGE_USER,
> -		.val = _PAGE_USER,
>   		.set = "U",
>   		.clear = ".",
>   	}, {
>   		.mask = _PAGE_EXEC,
> -		.val = _PAGE_EXEC,
>   		.set = "X",
>   		.clear = ".",
>   	}, {
>   		.mask = _PAGE_WRITE,
> -		.val = _PAGE_WRITE,
>   		.set = "W",
>   		.clear = ".",
>   	}, {
>   		.mask = _PAGE_READ,
> -		.val = _PAGE_READ,
>   		.set = "R",
>   		.clear = ".",
>   	}, {
>   		.mask = _PAGE_PRESENT,
> -		.val = _PAGE_PRESENT,
>   		.set = "V",
>   		.clear = ".",
>   	}
> @@ -208,15 +198,20 @@ static void dump_prot(struct pg_state *st)
>   	unsigned int i;
>   
>   	for (i = 0; i < ARRAY_SIZE(pte_bits); i++) {
> -		const char *s;
> -
> -		if ((st->current_prot & pte_bits[i].mask) == pte_bits[i].val)
> -			s = pte_bits[i].set;
> -		else
> -			s = pte_bits[i].clear;
> +		char s[7];
> +		unsigned long val;
> +
> +		val = st->current_prot & pte_bits[i].mask;
> +		if (val) {
> +			if (pte_bits[i].mask == _PAGE_SOFT)
> +				sprintf(s, pte_bits[i].set, val >> 8);
> +			else
> +				sprintf(s, "%s", pte_bits[i].set);
> +		} else {
> +			sprintf(s, "%s", pte_bits[i].clear);
> +		}
>   
> -		if (s)
> -			pt_dump_seq_printf(st->seq, " %s", s);
> +		pt_dump_seq_printf(st->seq, " %s", s);
>   	}
>   }
>   


You can add:

Reviewed-by: Alexandre Ghiti <alexghiti@rivosinc.com>

Tested-by: Alexandre Ghiti <alexghiti@rivosinc.com>

Thanks!

Alex


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linux-riscv@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-riscv

^ permalink raw reply	[flat|nested] 8+ messages in thread

* Re: [PATCH v3 2/3] riscv: Introduce PBMT field to PTDUMP
  2023-09-20  3:55 ` [PATCH v3 2/3] riscv: Introduce PBMT field to PTDUMP Yu Chien Peter Lin
@ 2023-09-20  9:12   ` Alexandre Ghiti
  0 siblings, 0 replies; 8+ messages in thread
From: Alexandre Ghiti @ 2023-09-20  9:12 UTC (permalink / raw)
  To: Yu Chien Peter Lin, paul.walmsley, palmer, aou, david, akpm,
	alexghiti, bjorn, linux-riscv, linux-kernel
  Cc: conor.dooley


On 20/09/2023 05:55, Yu Chien Peter Lin wrote:
> This patch introduces the PBMT field to the PTDUMP, so it can
> display the memory attributes for NC or IO.
>
> Signed-off-by: Yu Chien Peter Lin <peterlin@andestech.com>
> ---
> Changes v1 -> v2
> - no change
> Changes v2 -> v3
> - Add ".." when PBMT field is clear
> ---
>   arch/riscv/mm/ptdump.c | 16 ++++++++++++++++
>   1 file changed, 16 insertions(+)
>
> diff --git a/arch/riscv/mm/ptdump.c b/arch/riscv/mm/ptdump.c
> index 57a0926c6627..13997cf3fe36 100644
> --- a/arch/riscv/mm/ptdump.c
> +++ b/arch/riscv/mm/ptdump.c
> @@ -135,6 +135,12 @@ struct prot_bits {
>   
>   static const struct prot_bits pte_bits[] = {
>   	{
> +#ifdef CONFIG_64BIT
> +		.mask = _PAGE_MTMASK_SVPBMT,
> +		.set = "MT(%s)",
> +		.clear = "  ..  ",
> +	}, {
> +#endif
>   		.mask = _PAGE_SOFT,
>   		.set = "RSW(%d)",
>   		.clear = "  ..  ",
> @@ -205,6 +211,16 @@ static void dump_prot(struct pg_state *st)
>   		if (val) {
>   			if (pte_bits[i].mask == _PAGE_SOFT)
>   				sprintf(s, pte_bits[i].set, val >> 8);
> +#ifdef CONFIG_64BIT
> +			else if (pte_bits[i].mask == _PAGE_MTMASK_SVPBMT) {
> +				if (val == _PAGE_NOCACHE_SVPBMT)
> +					sprintf(s, pte_bits[i].set, "NC");
> +				else if (val == _PAGE_IO_SVPBMT)
> +					sprintf(s, pte_bits[i].set, "IO");
> +				else
> +					sprintf(s, pte_bits[i].set, "??");
> +			}
> +#endif
>   			else
>   				sprintf(s, "%s", pte_bits[i].set);
>   		} else {


You can add:

Reviewed-by: Alexandre Ghiti <alexghiti@rivosinc.com>

Tested-by: Alexandre Ghiti <alexghiti@rivosinc.com>

Thanks!

Alex


_______________________________________________
linux-riscv mailing list
linux-riscv@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-riscv

^ permalink raw reply	[flat|nested] 8+ messages in thread

* Re: [PATCH v3 3/3] riscv: Introduce NAPOT field to PTDUMP
  2023-09-20  3:55 ` [PATCH v3 3/3] riscv: Introduce NAPOT " Yu Chien Peter Lin
@ 2023-09-20  9:14   ` Alexandre Ghiti
  0 siblings, 0 replies; 8+ messages in thread
From: Alexandre Ghiti @ 2023-09-20  9:14 UTC (permalink / raw)
  To: Yu Chien Peter Lin, paul.walmsley, palmer, aou, david, akpm,
	alexghiti, bjorn, linux-riscv, linux-kernel
  Cc: conor.dooley


On 20/09/2023 05:55, Yu Chien Peter Lin wrote:
> This patch introduces the NAPOT field to PTDUMP, allowing it
> to display the letter "N" for pages that have the 63rd bit set.
>
> Signed-off-by: Yu Chien Peter Lin <peterlin@andestech.com>
> ---
> Changes v1 -> v3
> - no change
> ---
>   arch/riscv/mm/ptdump.c | 4 ++++
>   1 file changed, 4 insertions(+)
>
> diff --git a/arch/riscv/mm/ptdump.c b/arch/riscv/mm/ptdump.c
> index 13997cf3fe36..b71f08b91e53 100644
> --- a/arch/riscv/mm/ptdump.c
> +++ b/arch/riscv/mm/ptdump.c
> @@ -136,6 +136,10 @@ struct prot_bits {
>   static const struct prot_bits pte_bits[] = {
>   	{
>   #ifdef CONFIG_64BIT
> +		.mask = _PAGE_NAPOT,
> +		.set = "N",
> +		.clear = ".",
> +	}, {
>   		.mask = _PAGE_MTMASK_SVPBMT,
>   		.set = "MT(%s)",
>   		.clear = "  ..  ",

Nice to see that we actually transparently use napot mappings:

---[ PCI I/O start ]---
0xffff8d7fff000000-0xffff8d7fff010000    0x0000000003000000 64K PTE N   
..     ..   D A G . . W R V

You can add:

Reviewed-by: Alexandre Ghiti <alexghiti@rivosinc.com>

Tested-by: Alexandre Ghiti <alexghiti@rivosinc.com>

Thanks for the series, really appreciated!

Alex


_______________________________________________
linux-riscv mailing list
linux-riscv@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-riscv

^ permalink raw reply	[flat|nested] 8+ messages in thread

* Re: [PATCH v3 1/3] riscv: Improve PTDUMP to show RSW with non-zero value
  2023-09-20  3:55 [PATCH v3 1/3] riscv: Improve PTDUMP to show RSW with non-zero value Yu Chien Peter Lin
                   ` (2 preceding siblings ...)
  2023-09-20  9:10 ` [PATCH v3 1/3] riscv: Improve PTDUMP to show RSW with non-zero value Alexandre Ghiti
@ 2023-09-20  9:55 ` Conor Dooley
  2023-09-21  1:40   ` Yu-Chien Peter Lin
  3 siblings, 1 reply; 8+ messages in thread
From: Conor Dooley @ 2023-09-20  9:55 UTC (permalink / raw)
  To: Yu Chien Peter Lin
  Cc: paul.walmsley, palmer, aou, david, akpm, alexghiti, bjorn,
	linux-riscv, linux-kernel


[-- Attachment #1.1: Type: text/plain, Size: 613 bytes --]

On Wed, Sep 20, 2023 at 11:55:20AM +0800, Yu Chien Peter Lin wrote:
> RSW field can be used to encode 2 bits of software
> defined information. Currently, PTDUMP only prints
> "RSW" when its value is 1 or 3.
> 
> To fix this issue and improve the debugging experience
> with PTDUMP, we redefine _PAGE_SPECIAL to its original
> value and use _PAGE_SOFT as the RSW mask, allow it to
> print the RSW with any non-zero value.
> 
> This patch also removes the val from the struct prot_bits
> as it is no longer needed.
> 

Could you please add cover letters to multi-patch patchsets?

Thanks,
Conor.

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^ permalink raw reply	[flat|nested] 8+ messages in thread

* Re: [PATCH v3 1/3] riscv: Improve PTDUMP to show RSW with non-zero value
  2023-09-20  9:55 ` Conor Dooley
@ 2023-09-21  1:40   ` Yu-Chien Peter Lin
  0 siblings, 0 replies; 8+ messages in thread
From: Yu-Chien Peter Lin @ 2023-09-21  1:40 UTC (permalink / raw)
  To: Conor Dooley
  Cc: paul.walmsley, palmer, aou, david, akpm, alexghiti, bjorn,
	linux-riscv, linux-kernel

Hi Conor,

On Wed, Sep 20, 2023 at 10:55:30AM +0100, Conor Dooley wrote:
> On Wed, Sep 20, 2023 at 11:55:20AM +0800, Yu Chien Peter Lin wrote:
> > RSW field can be used to encode 2 bits of software
> > defined information. Currently, PTDUMP only prints
> > "RSW" when its value is 1 or 3.
> > 
> > To fix this issue and improve the debugging experience
> > with PTDUMP, we redefine _PAGE_SPECIAL to its original
> > value and use _PAGE_SOFT as the RSW mask, allow it to
> > print the RSW with any non-zero value.
> > 
> > This patch also removes the val from the struct prot_bits
> > as it is no longer needed.
> > 
> 
> Could you please add cover letters to multi-patch patchsets?
> 
> Thanks,
> Conor.

Sure, will do.

Regards,
Peter Lin

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^ permalink raw reply	[flat|nested] 8+ messages in thread

end of thread, other threads:[~2023-09-21  1:41 UTC | newest]

Thread overview: 8+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2023-09-20  3:55 [PATCH v3 1/3] riscv: Improve PTDUMP to show RSW with non-zero value Yu Chien Peter Lin
2023-09-20  3:55 ` [PATCH v3 2/3] riscv: Introduce PBMT field to PTDUMP Yu Chien Peter Lin
2023-09-20  9:12   ` Alexandre Ghiti
2023-09-20  3:55 ` [PATCH v3 3/3] riscv: Introduce NAPOT " Yu Chien Peter Lin
2023-09-20  9:14   ` Alexandre Ghiti
2023-09-20  9:10 ` [PATCH v3 1/3] riscv: Improve PTDUMP to show RSW with non-zero value Alexandre Ghiti
2023-09-20  9:55 ` Conor Dooley
2023-09-21  1:40   ` Yu-Chien Peter Lin

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