linux-arch.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: Huang Pei <huangpei@loongson.cn>
To: tsbogend@alpha.franken.de
Cc: akpm@linux-foundation.org, jiaxun.yang@flygoat.com,
	linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org,
	linux-mips@vger.kernel.org, linux-mm@kvack.org,
	maobibo@loongson.cn, paulburton@kernel.org
Subject: [PATCH] MIPS: make userspace mapping young by default
Date: Tue, 25 Aug 2020 11:20:39 +0800	[thread overview]
Message-ID: <20200825032039.21413-2-huangpei@loongson.cn> (raw)
In-Reply-To: <20200825032039.21413-1-huangpei@loongson.cn>

This patch adds support for non-rixi, based on [1].

MIPS page fault path take 3 exception (1 tlb miss + 2 tlb invalid), but
the second tlb invalid exception is just caused by __update_tlb from
do_page_fault writing tlb without _PAGE_VALID set. With this patch, it
only take 1 tlb miss + 1 tlb invalid exceptions

[1]: https://lkml.kernel.org/lkml/1591416169-26666-1-git-send-email-maobibo@loongson.cn/

Signed-off-by: Huang Pei <huangpei@loongson.cn>
---
 arch/mips/include/asm/pgtable.h | 32 +++++++++++++++-----------------
 arch/mips/mm/cache.c            | 25 +++++++++++++------------
 mm/memory.c                     |  3 ---
 3 files changed, 28 insertions(+), 32 deletions(-)

diff --git a/arch/mips/include/asm/pgtable.h b/arch/mips/include/asm/pgtable.h
index dd7a0f552cac..aaafe3d6a0a1 100644
--- a/arch/mips/include/asm/pgtable.h
+++ b/arch/mips/include/asm/pgtable.h
@@ -25,22 +25,22 @@
 struct mm_struct;
 struct vm_area_struct;
 
-#define PAGE_NONE	__pgprot(_PAGE_PRESENT | _PAGE_NO_READ | \
-				 _page_cachable_default)
-#define PAGE_SHARED	__pgprot(_PAGE_PRESENT | _PAGE_WRITE | \
-				 _page_cachable_default)
-#define PAGE_COPY	__pgprot(_PAGE_PRESENT | _PAGE_NO_EXEC | \
-				 _page_cachable_default)
-#define PAGE_READONLY	__pgprot(_PAGE_PRESENT | \
-				 _page_cachable_default)
-#define PAGE_KERNEL	__pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE | \
-				 _PAGE_GLOBAL | _page_cachable_default)
-#define PAGE_KERNEL_NC	__pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE | \
-				 _PAGE_GLOBAL | _CACHE_CACHABLE_NONCOHERENT)
-#define PAGE_USERIO	__pgprot(_PAGE_PRESENT | _PAGE_WRITE | \
-				 _page_cachable_default)
+#define PAGE_NONE      __pgprot(_PAGE_PRESENT | _PAGE_NO_READ | \
+                                _page_cachable_default)
+#define PAGE_SHARED    __pgprot(_PAGE_PRESENT | _PAGE_WRITE | \
+                                __READABLE | _page_cachable_default)
+#define PAGE_COPY      __pgprot(_PAGE_PRESENT | _PAGE_NO_EXEC | \
+                                __READABLE | _page_cachable_default)
+#define PAGE_READONLY  __pgprot(_PAGE_PRESENT |  __READABLE | \
+                                _page_cachable_default)
+#define PAGE_KERNEL    __pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE | \
+                                _PAGE_GLOBAL | _page_cachable_default)
+#define PAGE_KERNEL_NC __pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE | \
+                                _PAGE_GLOBAL | _CACHE_CACHABLE_NONCOHERENT)
+#define PAGE_USERIO    __pgprot(_PAGE_PRESENT | _PAGE_WRITE | \
+                                _page_cachable_default)
 #define PAGE_KERNEL_UNCACHED __pgprot(_PAGE_PRESENT | __READABLE | \
-			__WRITEABLE | _PAGE_GLOBAL | _CACHE_UNCACHED)
+                       __WRITEABLE | _PAGE_GLOBAL | _CACHE_UNCACHED)
 
 /*
  * If _PAGE_NO_EXEC is not defined, we can't do page protection for
@@ -414,8 +414,6 @@ static inline pte_t pte_mkyoung(pte_t pte)
 	return pte;
 }
 
-#define pte_sw_mkyoung	pte_mkyoung
-
 #ifdef CONFIG_MIPS_HUGE_TLB_SUPPORT
 static inline int pte_huge(pte_t pte)	{ return pte_val(pte) & _PAGE_HUGE; }
 
diff --git a/arch/mips/mm/cache.c b/arch/mips/mm/cache.c
index 3e81ba000096..ed75f2871aad 100644
--- a/arch/mips/mm/cache.c
+++ b/arch/mips/mm/cache.c
@@ -159,22 +159,23 @@ static inline void setup_protection_map(void)
 {
 	if (cpu_has_rixi) {
 		protection_map[0]  = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_NO_READ);
-		protection_map[1]  = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC);
+		protection_map[1]  = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC | __READABLE);
 		protection_map[2]  = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_NO_READ);
-		protection_map[3]  = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC);
-		protection_map[4]  = __pgprot(_page_cachable_default | _PAGE_PRESENT);
-		protection_map[5]  = __pgprot(_page_cachable_default | _PAGE_PRESENT);
-		protection_map[6]  = __pgprot(_page_cachable_default | _PAGE_PRESENT);
-		protection_map[7]  = __pgprot(_page_cachable_default | _PAGE_PRESENT);
+		protection_map[3]  = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC | __READABLE);
+		protection_map[4]  = __pgprot(_page_cachable_default | _PAGE_PRESENT | __READABLE);
+		protection_map[5]  = __pgprot(_page_cachable_default | _PAGE_PRESENT | __READABLE);
+		protection_map[6]  = __pgprot(_page_cachable_default | _PAGE_PRESENT | __READABLE);
+		protection_map[7]  = __pgprot(_page_cachable_default | _PAGE_PRESENT | __READABLE);
 
 		protection_map[8]  = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_NO_READ);
-		protection_map[9]  = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC);
+		protection_map[9]  = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC | __READABLE);
 		protection_map[10] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_WRITE | _PAGE_NO_READ);
-		protection_map[11] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_WRITE);
-		protection_map[12] = __pgprot(_page_cachable_default | _PAGE_PRESENT);
-		protection_map[13] = __pgprot(_page_cachable_default | _PAGE_PRESENT);
-		protection_map[14] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_WRITE);
-		protection_map[15] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_WRITE);
+		protection_map[11] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_WRITE | __READABLE);
+		protection_map[12]  = __pgprot(_page_cachable_default | _PAGE_PRESENT | __READABLE);
+		protection_map[13]  = __pgprot(_page_cachable_default | _PAGE_PRESENT | __READABLE);
+		protection_map[14]  = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC | __READABLE);
+		protection_map[15]  = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC | __READABLE);
+
 
 	} else {
 		protection_map[0] = PAGE_NONE;
diff --git a/mm/memory.c b/mm/memory.c
index 602f4283122f..5100ab5bcf77 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -2705,7 +2705,6 @@ static vm_fault_t wp_page_copy(struct vm_fault *vmf)
 		}
 		flush_cache_page(vma, vmf->address, pte_pfn(vmf->orig_pte));
 		entry = mk_pte(new_page, vma->vm_page_prot);
-		entry = pte_sw_mkyoung(entry);
 		entry = maybe_mkwrite(pte_mkdirty(entry), vma);
 		/*
 		 * Clear the pte entry and flush it first, before updating the
@@ -3386,7 +3385,6 @@ static vm_fault_t do_anonymous_page(struct vm_fault *vmf)
 	__SetPageUptodate(page);
 
 	entry = mk_pte(page, vma->vm_page_prot);
-	entry = pte_sw_mkyoung(entry);
 	if (vma->vm_flags & VM_WRITE)
 		entry = pte_mkwrite(pte_mkdirty(entry));
 
@@ -3661,7 +3659,6 @@ vm_fault_t alloc_set_pte(struct vm_fault *vmf, struct page *page)
 
 	flush_icache_page(vma, page);
 	entry = mk_pte(page, vma->vm_page_prot);
-	entry = pte_sw_mkyoung(entry);
 	if (write)
 		entry = maybe_mkwrite(pte_mkdirty(entry), vma);
 	/* copy-on-write page */
-- 
2.17.1


  reply	other threads:[~2020-08-25  3:23 UTC|newest]

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-06-06  4:02 [PATCH v2 1/2] MIPS: Set page access bit with pgprot on platforms with RIXI Bibo Mao
2020-06-06  4:02 ` Bibo Mao
2020-06-06  4:02 ` [PATCH v2 2/2] MIPS: Add writable-applies-readable policy with pgrot Bibo Mao
2020-06-06  4:02   ` Bibo Mao
2020-07-26  8:32 ` [PATCH v2 1/2] MIPS: Set page access bit with pgprot on platforms with RIXI Thomas Bogendoerfer
2020-07-26  8:32   ` Thomas Bogendoerfer
2020-08-25  3:20   ` [PATCH v2 1/2] MIPS: Set page access bit with pgprot on Huang Pei
2020-08-25  3:20     ` Huang Pei [this message]
2020-09-04  8:49 [PATCH] MIPS: make userspace mapping young by default Huang Pei
2020-09-07  8:50 ` maobibo
2020-09-07 10:35   ` Huang Pei
2020-09-07 13:10     ` maobibo
2020-09-19  7:39 Huang Pei
2021-02-04  1:39 Huang Pei
2021-02-04  3:29 ` Nicholas Piggin
2021-02-04  4:46   ` 黄沛
2021-02-04 10:34   ` Thomas Bogendoerfer
2021-02-04 11:27     ` Nicholas Piggin
2021-02-04 15:22 ` Thomas Bogendoerfer
2021-02-05 23:41   ` Andrew Morton
2021-02-08 17:44     ` Christophe Leroy
2021-02-08 19:48       ` Andrew Morton

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=20200825032039.21413-2-huangpei@loongson.cn \
    --to=huangpei@loongson.cn \
    --cc=akpm@linux-foundation.org \
    --cc=jiaxun.yang@flygoat.com \
    --cc=linux-arch@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-mips@vger.kernel.org \
    --cc=linux-mm@kvack.org \
    --cc=maobibo@loongson.cn \
    --cc=paulburton@kernel.org \
    --cc=tsbogend@alpha.franken.de \
    /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 a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).