All of lore.kernel.org
 help / color / mirror / Atom feed
From: Christophe Leroy <christophe.leroy@c-s.fr>
To: Benjamin Herrenschmidt <benh@kernel.crashing.org>,
	Paul Mackerras <paulus@samba.org>,
	Michael Ellerman <mpe@ellerman.id.au>,
	npiggin@gmail.com, aneesh.kumar@linux.vnet.ibm.com
Cc: linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org
Subject: [RFC PATCH v1 14/17] powerpc/mm: Allow platforms to redefine some helpers
Date: Wed,  5 Sep 2018 12:37:19 +0000 (UTC)	[thread overview]
Message-ID: <7827f7644d12c321a56c77a5450176447f23c704.1535913369.git.christophe.leroy@c-s.fr> (raw)
In-Reply-To: <cover.1535913369.git.christophe.leroy@c-s.fr>

The 40xx defines _PAGE_HWWRITE while others don't.
The 8xx defines _PAGE_RO instead of _PAGE_RW.
The 8xx defines _PAGE_PRIVILEGED instead of _PAGE_USER.
The 8xx defines _PAGE_HUGE and _PAGE_NA while others don't.

Lets those platforms redefine pte_write(), pte_wrprotect() and
pte_mkwrite() and get _PAGE_RO and _PAGE_HWWRITE off the common
helpers.

Lets the 8xx redefine pte_user(), pte_mkprivileged() and pte_mkuser()
and get rid of _PAGE_PRIVILEGED and _PAGE_USER default values.

Lets the 8xx redefine pte_mkhuge() and get rid of
_PAGE_HUGE default value.

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
---
 arch/powerpc/include/asm/nohash/32/pgtable.h | 16 ++++-----
 arch/powerpc/include/asm/nohash/32/pte-40x.h | 16 +++++++++
 arch/powerpc/include/asm/nohash/32/pte-8xx.h | 51 ++++++++++++++++++++++++++++
 arch/powerpc/include/asm/nohash/64/pgtable.h |  4 ---
 arch/powerpc/include/asm/nohash/pgtable.h    | 24 +++++++++----
 arch/powerpc/include/asm/pte-common.h        | 24 -------------
 6 files changed, 91 insertions(+), 44 deletions(-)

diff --git a/arch/powerpc/include/asm/nohash/32/pgtable.h b/arch/powerpc/include/asm/nohash/32/pgtable.h
index 4fab3a7d764b..1577260641c9 100644
--- a/arch/powerpc/include/asm/nohash/32/pgtable.h
+++ b/arch/powerpc/include/asm/nohash/32/pgtable.h
@@ -136,14 +136,12 @@ extern int icache_44x_need_flush;
 #define pte_clear(mm, addr, ptep) \
 	do { pte_update(ptep, ~0, 0); } while (0)
 
+#ifndef pte_mkwrite
 static inline pte_t pte_mkwrite(pte_t pte)
 {
-	pte_basic_t ptev;
-
-	ptev = pte_val(pte) & ~_PAGE_RO;
-	ptev |= _PAGE_RW;
-	return __pte(ptev);
+	return __pte(pte_val(pte) | _PAGE_RW);
 }
+#endif
 
 static inline pte_t pte_mkdirty(pte_t pte)
 {
@@ -155,14 +153,12 @@ static inline pte_t pte_mkyoung(pte_t pte)
 	return __pte(pte_val(pte) | _PAGE_ACCESSED);
 }
 
+#ifndef pte_wrprotect
 static inline pte_t pte_wrprotect(pte_t pte)
 {
-	pte_basic_t ptev;
-
-	ptev = pte_val(pte) & ~(_PAGE_RW | _PAGE_HWWRITE);
-	ptev |= _PAGE_RO;
-	return __pte(ptev);
+	return __pte(pte_val(pte) & ~_PAGE_RW);
 }
+#endif
 
 static inline pte_t pte_mkexec(pte_t pte)
 {
diff --git a/arch/powerpc/include/asm/nohash/32/pte-40x.h b/arch/powerpc/include/asm/nohash/32/pte-40x.h
index 2b48bc289a4d..ab043b3e9b99 100644
--- a/arch/powerpc/include/asm/nohash/32/pte-40x.h
+++ b/arch/powerpc/include/asm/nohash/32/pte-40x.h
@@ -87,5 +87,21 @@
 #define PAGE_READONLY	__pgprot(_PAGE_BASE | _PAGE_USER)
 #define PAGE_READONLY_X	__pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_EXEC)
 
+#ifndef __ASSEMBLY__
+static inline pte_t pte_wrprotect(pte_t pte)
+{
+	return __pte(pte_val(pte) & ~(_PAGE_RW | _PAGE_HWWRITE));
+}
+
+#define pte_wrprotect pte_wrprotect
+
+static inline pte_t pte_mkclean(pte_t pte)
+{
+	return __pte(pte_val(pte) & ~(_PAGE_DIRTY | _PAGE_HWWRITE));
+}
+
+#define pte_mkclean pte_mkclean
+#endif
+
 #endif /* __KERNEL__ */
 #endif /*  _ASM_POWERPC_NOHASH_32_PTE_40x_H */
diff --git a/arch/powerpc/include/asm/nohash/32/pte-8xx.h b/arch/powerpc/include/asm/nohash/32/pte-8xx.h
index d06fc45bd9ac..b899c3c877ac 100644
--- a/arch/powerpc/include/asm/nohash/32/pte-8xx.h
+++ b/arch/powerpc/include/asm/nohash/32/pte-8xx.h
@@ -87,5 +87,56 @@
 #define PAGE_READONLY	__pgprot(_PAGE_BASE | _PAGE_RO)
 #define PAGE_READONLY_X	__pgprot(_PAGE_BASE | _PAGE_RO | _PAGE_EXEC)
 
+#ifndef __ASSEMBLY__
+static inline pte_t pte_wrprotect(pte_t pte)
+{
+	return __pte(pte_val(pte) | _PAGE_RO);
+}
+
+#define pte_wrprotect pte_wrprotect
+
+static inline int pte_write(pte_t pte)
+{
+	return !(pte_val(pte) & _PAGE_RO);
+}
+
+#define pte_write pte_write
+
+static inline pte_t pte_mkwrite(pte_t pte)
+{
+	return __pte(pte_val(pte) & ~_PAGE_RO);
+}
+
+#define pte_mkwrite pte_mkwrite
+
+static inline bool pte_user(pte_t pte)
+{
+	return !(pte_val(pte) & _PAGE_PRIVILEGED);
+}
+
+#define pte_user pte_user
+
+static inline pte_t pte_mkprivileged(pte_t pte)
+{
+	return __pte(pte_val(pte) | _PAGE_PRIVILEGED);
+}
+
+#define pte_mkprivileged pte_mkprivileged
+
+static inline pte_t pte_mkuser(pte_t pte)
+{
+	return __pte(pte_val(pte) & ~_PAGE_PRIVILEGED);
+}
+
+#define pte_mkuser pte_mkuser
+
+static inline pte_t pte_mkhuge(pte_t pte)
+{
+	return __pte(pte_val(pte) | _PAGE_HUGE);
+}
+
+#define pte_mkhuge pte_mkhuge
+#endif
+
 #endif /* __KERNEL__ */
 #endif /*  _ASM_POWERPC_NOHASH_32_PTE_8xx_H */
diff --git a/arch/powerpc/include/asm/nohash/64/pgtable.h b/arch/powerpc/include/asm/nohash/64/pgtable.h
index 40162de77c3a..c9e6626093ea 100644
--- a/arch/powerpc/include/asm/nohash/64/pgtable.h
+++ b/arch/powerpc/include/asm/nohash/64/pgtable.h
@@ -90,11 +90,7 @@
  */
 #include <asm/nohash/pte-book3e.h>
 
-#define _PAGE_HWWRITE	0
 #define _PAGE_SAO	0
-#define _PAGE_RO 0
-#define _PAGE_NA 0
-#define _PAGE_HUGE 0
 
 #define PTE_RPN_MASK	(~((1UL << PTE_RPN_SHIFT) - 1))
 
diff --git a/arch/powerpc/include/asm/nohash/pgtable.h b/arch/powerpc/include/asm/nohash/pgtable.h
index a40ab294d541..a98768ebc481 100644
--- a/arch/powerpc/include/asm/nohash/pgtable.h
+++ b/arch/powerpc/include/asm/nohash/pgtable.h
@@ -38,10 +38,12 @@
 #ifndef __ASSEMBLY__
 
 /* Generic accessors to PTE bits */
+#ifndef pte_write
 static inline int pte_write(pte_t pte)
 {
-	return (pte_val(pte) & (_PAGE_RW | _PAGE_RO)) != _PAGE_RO;
+	return pte_val(pte) & _PAGE_RW;
 }
+#endif
 static inline int pte_read(pte_t pte)		{ return 1; }
 static inline int pte_dirty(pte_t pte)		{ return pte_val(pte) & _PAGE_DIRTY; }
 static inline int pte_special(pte_t pte)	{ return pte_val(pte) & _PAGE_SPECIAL; }
@@ -78,10 +80,12 @@ static inline int pte_present(pte_t pte)
  * and PTE_64BIT, PAGE_KERNEL_X contains _PAGE_BAP_SR which is also in
  * _PAGE_USER.  Need to explicitly match _PAGE_BAP_UR bit in that case too.
  */
+#ifndef pte_user
 static inline bool pte_user(pte_t pte)
 {
-	return (pte_val(pte) & (_PAGE_USER | _PAGE_PRIVILEGED)) == _PAGE_USER;
+	return (pte_val(pte) & _PAGE_USER) == _PAGE_USER;
 }
+#endif
 
 /*
  * We only find page table entry in the last level
@@ -121,10 +125,12 @@ static inline pte_t pte_exprotect(pte_t pte)
 	return __pte(pte_val(pte) & ~_PAGE_EXEC);
 }
 
+#ifndef pte_mkclean
 static inline pte_t pte_mkclean(pte_t pte)
 {
-	return __pte(pte_val(pte) & ~(_PAGE_DIRTY | _PAGE_HWWRITE));
+	return __pte(pte_val(pte) & ~_PAGE_DIRTY);
 }
+#endif
 
 static inline pte_t pte_mkold(pte_t pte)
 {
@@ -141,20 +147,26 @@ static inline pte_t pte_mkspecial(pte_t pte)
 	return __pte(pte_val(pte) | _PAGE_SPECIAL);
 }
 
+#ifndef pte_mkhuge
 static inline pte_t pte_mkhuge(pte_t pte)
 {
-	return __pte(pte_val(pte) | _PAGE_HUGE);
+	return __pte(pte_val(pte));
 }
+#endif
 
+#ifndef pte_mkprivileged
 static inline pte_t pte_mkprivileged(pte_t pte)
 {
-	return __pte((pte_val(pte) & ~_PAGE_USER) | _PAGE_PRIVILEGED);
+	return __pte(pte_val(pte) & ~_PAGE_USER);
 }
+#endif
 
+#ifndef pte_mkuser
 static inline pte_t pte_mkuser(pte_t pte)
 {
-	return __pte((pte_val(pte) & ~_PAGE_PRIVILEGED) | _PAGE_USER);
+	return __pte(pte_val(pte) | _PAGE_USER);
 }
+#endif
 
 static inline pte_t pte_mknoncoherent(pte_t pte)
 {
diff --git a/arch/powerpc/include/asm/pte-common.h b/arch/powerpc/include/asm/pte-common.h
index 4d594039bca5..1a2102f8b1e7 100644
--- a/arch/powerpc/include/asm/pte-common.h
+++ b/arch/powerpc/include/asm/pte-common.h
@@ -5,36 +5,12 @@
  * Some bits are only used on some cpu families... Make sure that all
  * the undefined gets a sensible default
  */
-#ifndef _PAGE_HWWRITE
-#define _PAGE_HWWRITE	0
-#endif
 #ifndef _PAGE_COHERENT
 #define _PAGE_COHERENT	0
 #endif
 #ifndef _PAGE_WRITETHRU
 #define _PAGE_WRITETHRU	0
 #endif
-/* _PAGE_RO and _PAGE_RW shall not be defined at the same time */
-#ifndef _PAGE_RO
-#define _PAGE_RO 0
-#else
-#define _PAGE_RW 0
-#endif
-
-/* At least one of _PAGE_PRIVILEGED or _PAGE_USER must be defined */
-#ifndef _PAGE_PRIVILEGED
-#define _PAGE_PRIVILEGED 0
-#else
-#ifndef _PAGE_USER
-#define _PAGE_USER 0
-#endif
-#endif
-#ifndef _PAGE_NA
-#define _PAGE_NA 0
-#endif
-#ifndef _PAGE_HUGE
-#define _PAGE_HUGE 0
-#endif
 
 /* Location of the PFN in the PTE. Most 32-bit platforms use the same
  * as _PAGE_SHIFT here (ie, naturally aligned).
-- 
2.13.3


  parent reply	other threads:[~2018-09-05 12:37 UTC|newest]

Thread overview: 26+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-09-05 12:36 [RFC PATCH v1 00/17] ban the use of _PAGE_XXX flags outside platform specific code Christophe Leroy
2018-09-05 12:36 ` [RFC PATCH v1 01/17] powerpc/32: Add ioremap_wt() Christophe Leroy
2018-09-05 12:36 ` [RFC PATCH v1 02/17] powerpc/mm: remove direct use of flags related to cache Christophe Leroy
2018-09-05 12:36 ` [RFC PATCH v1 03/17] powerpc/mm: dont't use _PAGE_EXEC in book3s/32 Christophe Leroy
2018-09-05 12:36 ` [RFC PATCH v1 04/17] powerpc/mm: move some nohash pte helpers in nohash/[32:64]/pgtable.h Christophe Leroy
2018-09-05 12:37 ` [RFC PATCH v1 05/17] powerpc/mm: add pte helpers to query and change pte flags Christophe Leroy
2018-09-05 12:37 ` [RFC PATCH v1 06/17] powerpc/mm: use pte helpers in generic code Christophe Leroy
2018-09-05 12:37 ` [RFC PATCH v1 07/17] powerpc/mm: Split dump_pagelinuxtables flag_array table Christophe Leroy
2018-09-05 12:37 ` [RFC PATCH v1 08/17] powerpc/mm: drop unused page flags Christophe Leroy
2018-09-05 12:37 ` [RFC PATCH v1 09/17] powerpc/mm: move __P and __S tables in the common pgtable.h Christophe Leroy
2018-09-05 12:37 ` [RFC PATCH v1 10/17] powerpc/book3s/32: do not include pte-common.h Christophe Leroy
2018-09-05 12:37 ` [RFC PATCH v1 11/17] powerpc/mm: Move pte_user() into nohash/pgtable.h Christophe Leroy
2018-09-05 12:37 ` [RFC PATCH v1 12/17] powerpc/mm: Distribute platform specific PAGE and PMD flags and definitions Christophe Leroy
2018-09-05 12:37 ` [RFC PATCH v1 13/17] powerpc/nohash/64: do not include pte-common.h Christophe Leroy
2018-09-05 12:37 ` Christophe Leroy [this message]
2018-09-05 12:37 ` [RFC PATCH v1 15/17] powerpc/mm: Define platform default caches related flags Christophe Leroy
2018-09-05 12:37 ` [RFC PATCH v1 16/17] powerpc/mm: Get rid of pte-common.h Christophe Leroy
2018-09-05 12:37 ` [RFC PATCH v1 17/17] powerpc/8xx: change name of a few page flags to avoid confusion Christophe Leroy
2018-09-05 14:03 ` [RFC PATCH v1 00/17] ban the use of _PAGE_XXX flags outside platform specific code Aneesh Kumar K.V
2018-09-05 14:32   ` Christophe Leroy
2018-09-06  9:58 ` Aneesh Kumar K.V
2018-09-06 21:36   ` Christophe Leroy
2018-09-10  6:08     ` Aneesh Kumar K.V
2018-09-12 16:05       ` Christophe LEROY
2018-09-07  9:41   ` Christophe Leroy
2018-09-12 16:07   ` Christophe LEROY

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=7827f7644d12c321a56c77a5450176447f23c704.1535913369.git.christophe.leroy@c-s.fr \
    --to=christophe.leroy@c-s.fr \
    --cc=aneesh.kumar@linux.vnet.ibm.com \
    --cc=benh@kernel.crashing.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linuxppc-dev@lists.ozlabs.org \
    --cc=mpe@ellerman.id.au \
    --cc=npiggin@gmail.com \
    --cc=paulus@samba.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.