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[2/2] powerpc/mm/radix: Remove unnecessary ptesync

Message ID 1491057708-15934-2-git-send-email-aneesh.kumar@linux.vnet.ibm.com (mailing list archive)
State Accepted
Commit f7327e0ba3805470cced2acfa053e795362ee41d
Headers show

Commit Message

Aneesh Kumar K.V April 1, 2017, 2:41 p.m. UTC 
For a tlbiel with pid, we need to issue tlbiel with set number encoded. We
don't need to do ptesync for each of those. Instead we need one for the entire
tlbiel pid operation.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
---
 arch/powerpc/mm/tlb-radix.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

Comments

Anton Blanchard April 10, 2017, 3:11 a.m. UTC | #1 
On Sat,  1 Apr 2017 20:11:48 +0530
"Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com> wrote:

> For a tlbiel with pid, we need to issue tlbiel with set number
> encoded. We don't need to do ptesync for each of those. Instead we
> need one for the entire tlbiel pid operation.
> 
> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
> Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>

Thanks Aneesh.

Acked-by: Anton Blanchard <anton@samba.org>

Anton

> ---
>  arch/powerpc/mm/tlb-radix.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/powerpc/mm/tlb-radix.c b/arch/powerpc/mm/tlb-radix.c
> index f3e58bd60d1a..b68b5219cf45 100644
> --- a/arch/powerpc/mm/tlb-radix.c
> +++ b/arch/powerpc/mm/tlb-radix.c
> @@ -34,10 +34,8 @@ static inline void __tlbiel_pid(unsigned long pid,
> int set, prs = 1; /* process scoped */
>  	r = 1;   /* raidx format */
>  
> -	asm volatile("ptesync": : :"memory");
>  	asm volatile(PPC_TLBIEL(%0, %4, %3, %2, %1)
>  		     : : "r"(rb), "i"(r), "i"(prs), "i"(ric),
> "r"(rs) : "memory");
> -	asm volatile("ptesync": : :"memory");
>  }
>  
>  /*
> @@ -47,9 +45,11 @@ static inline void _tlbiel_pid(unsigned long pid,
> unsigned long ric) {
>  	int set;
>  
> +	asm volatile("ptesync": : :"memory");
>  	for (set = 0; set < POWER9_TLB_SETS_RADIX ; set++) {
>  		__tlbiel_pid(pid, set, ric);
>  	}
> +	asm volatile("ptesync": : :"memory");
>  	asm volatile(PPC_INVALIDATE_ERAT "; isync" : : :"memory");
>  }
>
Michael Ellerman April 10, 2017, 10:49 p.m. UTC | #2 
On Sat, 2017-04-01 at 14:41:48 UTC, "Aneesh Kumar K.V" wrote:
> For a tlbiel with pid, we need to issue tlbiel with set number encoded. We
> don't need to do ptesync for each of those. Instead we need one for the entire
> tlbiel pid operation.
> 
> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
> Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
> Acked-by: Anton Blanchard <anton@samba.org>

Applied to powerpc next, thanks.

https://git.kernel.org/powerpc/c/f7327e0ba3805470cced2acfa053e7

cheers
diff mbox

Patch

diff --git a/arch/powerpc/mm/tlb-radix.c b/arch/powerpc/mm/tlb-radix.c
index f3e58bd60d1a..b68b5219cf45 100644
--- a/arch/powerpc/mm/tlb-radix.c
+++ b/arch/powerpc/mm/tlb-radix.c
@@ -34,10 +34,8 @@  static inline void __tlbiel_pid(unsigned long pid, int set,
 	prs = 1; /* process scoped */
 	r = 1;   /* raidx format */
 
-	asm volatile("ptesync": : :"memory");
 	asm volatile(PPC_TLBIEL(%0, %4, %3, %2, %1)
 		     : : "r"(rb), "i"(r), "i"(prs), "i"(ric), "r"(rs) : "memory");
-	asm volatile("ptesync": : :"memory");
 }
 
 /*
@@ -47,9 +45,11 @@  static inline void _tlbiel_pid(unsigned long pid, unsigned long ric)
 {
 	int set;
 
+	asm volatile("ptesync": : :"memory");
 	for (set = 0; set < POWER9_TLB_SETS_RADIX ; set++) {
 		__tlbiel_pid(pid, set, ric);
 	}
+	asm volatile("ptesync": : :"memory");
 	asm volatile(PPC_INVALIDATE_ERAT "; isync" : : :"memory");
 }