From: Christophe Leroy <christophe.leroy@csgroup.eu>
To: Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Paul Mackerras <paulus@samba.org>,
Michael Ellerman <mpe@ellerman.id.au>
Cc: Christophe Leroy <christophe.leroy@csgroup.eu>,
linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org
Subject: [PATCH] powerpc: align address to page boundary in change_page_attr()
Date: Mon, 21 Mar 2022 16:44:45 +0100 [thread overview]
Message-ID: <6bb118fb2ee89fa3c1f9cf90ed19f88220002cb0.1647877467.git.christophe.leroy@csgroup.eu> (raw)
Aligning address to page boundary allows flush_tlb_kernel_range()
to know it's a single page flush and use tlbie instead of tlbia.
On 603 we now have the following code in first leg of
change_page_attr():
2c: 55 29 00 3c rlwinm r9,r9,0,0,30
30: 91 23 00 00 stw r9,0(r3)
34: 7c 00 22 64 tlbie r4,r0
38: 7c 00 04 ac hwsync
3c: 38 60 00 00 li r3,0
40: 4e 80 00 20 blr
Before we had:
28: 55 29 00 3c rlwinm r9,r9,0,0,30
2c: 91 23 00 00 stw r9,0(r3)
30: 54 89 00 26 rlwinm r9,r4,0,0,19
34: 38 84 10 00 addi r4,r4,4096
38: 7c 89 20 50 subf r4,r9,r4
3c: 28 04 10 00 cmplwi r4,4096
40: 41 81 00 30 bgt 70 <change_page_attr+0x70>
44: 7c 00 4a 64 tlbie r9,r0
48: 7c 00 04 ac hwsync
4c: 38 60 00 00 li r3,0
50: 4e 80 00 20 blr
...
70: 94 21 ff f0 stwu r1,-16(r1)
74: 7c 08 02 a6 mflr r0
78: 90 01 00 14 stw r0,20(r1)
7c: 48 00 00 01 bl 7c <change_page_attr+0x7c>
7c: R_PPC_REL24 _tlbia
80: 80 01 00 14 lwz r0,20(r1)
84: 38 60 00 00 li r3,0
88: 7c 08 03 a6 mtlr r0
8c: 38 21 00 10 addi r1,r1,16
90: 4e 80 00 20 blr
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
---
arch/powerpc/mm/pageattr.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/arch/powerpc/mm/pageattr.c b/arch/powerpc/mm/pageattr.c
index 85753e32a4de..6163e484bc6d 100644
--- a/arch/powerpc/mm/pageattr.c
+++ b/arch/powerpc/mm/pageattr.c
@@ -31,6 +31,7 @@ static int change_page_attr(pte_t *ptep, unsigned long addr, void *data)
{
long action = (long)data;
+ addr &= PAGE_MASK;
/* modify the PTE bits as desired */
switch (action) {
case SET_MEMORY_RO:
--
2.35.1
next reply other threads:[~2022-03-21 15:46 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-03-21 15:44 Christophe Leroy [this message]
2022-05-15 10:28 ` [PATCH] powerpc: align address to page boundary in change_page_attr() Michael Ellerman
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