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From:   David Hildenbrand <david@redhat.com>
To:     linux-kernel@vger.kernel.org
Cc:     Andrew Morton <akpm@linux-foundation.org>,
        Hugh Dickins <hughd@google.com>,
        John Hubbard <jhubbard@nvidia.com>,
        Jason Gunthorpe <jgg@nvidia.com>,
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        Vlastimil Babka <vbabka@suse.cz>,
        Nadav Amit <namit@vmware.com>,
        Andrea Arcangeli <aarcange@redhat.com>,
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        x86@kernel.org, linux-alpha@vger.kernel.org,
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        loongarch@lists.linux.dev, linux-m68k@lists.linux-m68k.org,
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        linux-sh@vger.kernel.org, sparclinux@vger.kernel.org,
        linux-um@lists.infradead.org, linux-xtensa@linux-xtensa.org,
        David Hildenbrand <david@redhat.com>,
        Michal Simek <monstr@monstr.eu>
Subject: [PATCH mm-unstable v1 11/26] microblaze/mm: support __HAVE_ARCH_PTE_SWP_EXCLUSIVE
Date:   Fri, 13 Jan 2023 18:10:11 +0100
Message-Id: <20230113171026.582290-12-david@redhat.com>
In-Reply-To: <20230113171026.582290-1-david@redhat.com>
References: <20230113171026.582290-1-david@redhat.com>
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Let's support __HAVE_ARCH_PTE_SWP_EXCLUSIVE by stealing one bit
from the type. Generic MM currently only uses 5 bits for the type
(MAX_SWAPFILES_SHIFT), so the stolen bit is effectively unused.

The shift by 2 when converting between PTE and arch-specific swap entry
makes the swap PTE layout a little bit harder to decipher.

While at it, drop the comment from paulus---copy-and-paste leftover
from powerpc where we actually have _PAGE_HASHPTE---and mask the type in
__swp_entry_to_pte() as well.

Cc: Michal Simek <monstr@monstr.eu>
Signed-off-by: David Hildenbrand <david@redhat.com>
---
 arch/m68k/include/asm/mcf_pgtable.h   |  4 +--
 arch/microblaze/include/asm/pgtable.h | 45 +++++++++++++++++++++------
 2 files changed, 37 insertions(+), 12 deletions(-)

diff --git a/arch/m68k/include/asm/mcf_pgtable.h b/arch/m68k/include/asm/mcf_pgtable.h
index 3f8f4d0e66dd..e573d7b649f7 100644
--- a/arch/m68k/include/asm/mcf_pgtable.h
+++ b/arch/m68k/include/asm/mcf_pgtable.h
@@ -46,8 +46,8 @@
 #define _CACHEMASK040		(~0x060)
 #define _PAGE_GLOBAL040		0x400   /* 68040 global bit, used for kva descs */
 
-/* We borrow bit 7 to store the exclusive marker in swap PTEs. */
-#define _PAGE_SWP_EXCLUSIVE	0x080
+/* We borrow bit 24 to store the exclusive marker in swap PTEs. */
+#define _PAGE_SWP_EXCLUSIVE	CF_PAGE_NOCACHE
 
 /*
  * Externally used page protection values.
diff --git a/arch/microblaze/include/asm/pgtable.h b/arch/microblaze/include/asm/pgtable.h
index 42f5988e998b..7e3de54bf426 100644
--- a/arch/microblaze/include/asm/pgtable.h
+++ b/arch/microblaze/include/asm/pgtable.h
@@ -131,10 +131,10 @@ extern pte_t *va_to_pte(unsigned long address);
  * of the 16 available.  Bit 24-26 of the TLB are cleared in the TLB
  * miss handler.  Bit 27 is PAGE_USER, thus selecting the correct
  * zone.
- * - PRESENT *must* be in the bottom two bits because swap cache
- * entries use the top 30 bits.  Because 4xx doesn't support SMP
- * anyway, M is irrelevant so we borrow it for PAGE_PRESENT.  Bit 30
- * is cleared in the TLB miss handler before the TLB entry is loaded.
+ * - PRESENT *must* be in the bottom two bits because swap PTEs use the top
+ * 30 bits.  Because 4xx doesn't support SMP anyway, M is irrelevant so we
+ * borrow it for PAGE_PRESENT.  Bit 30 is cleared in the TLB miss handler
+ * before the TLB entry is loaded.
  * - All other bits of the PTE are loaded into TLBLO without
  *  * modification, leaving us only the bits 20, 21, 24, 25, 26, 30 for
  * software PTE bits.  We actually use bits 21, 24, 25, and
@@ -155,6 +155,9 @@ extern pte_t *va_to_pte(unsigned long address);
 #define _PAGE_ACCESSED	0x400	/* software: R: page referenced */
 #define _PMD_PRESENT	PAGE_MASK
 
+/* We borrow bit 24 to store the exclusive marker in swap PTEs. */
+#define _PAGE_SWP_EXCLUSIVE	_PAGE_DIRTY
+
 /*
  * Some bits are unused...
  */
@@ -393,18 +396,40 @@ static inline unsigned long pmd_page_vaddr(pmd_t pmd)
 extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
 
 /*
- * Encode and decode a swap entry.
- * Note that the bits we use in a PTE for representing a swap entry
- * must not include the _PAGE_PRESENT bit, or the _PAGE_HASHPTE bit
- * (if used).  -- paulus
+ * Encode/decode swap entries and swap PTEs. Swap PTEs are all PTEs that
+ * are !pte_none() && !pte_present().
+ *
+ *                         1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 3 3
+ *   0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+ *   <------------------ offset -------------------> E < type -> 0 0
+ *
+ *   E is the exclusive marker that is not stored in swap entries.
  */
-#define __swp_type(entry)		((entry).val & 0x3f)
+#define __swp_type(entry)	((entry).val & 0x1f)
 #define __swp_offset(entry)	((entry).val >> 6)
 #define __swp_entry(type, offset) \
-		((swp_entry_t) { (type) | ((offset) << 6) })
+		((swp_entry_t) { ((type) & 0x1f) | ((offset) << 6) })
 #define __pte_to_swp_entry(pte)	((swp_entry_t) { pte_val(pte) >> 2 })
 #define __swp_entry_to_pte(x)	((pte_t) { (x).val << 2 })
 
+#define __HAVE_ARCH_PTE_SWP_EXCLUSIVE
+static inline int pte_swp_exclusive(pte_t pte)
+{
+	return pte_val(pte) & _PAGE_SWP_EXCLUSIVE;
+}
+
+static inline pte_t pte_swp_mkexclusive(pte_t pte)
+{
+	pte_val(pte) |= _PAGE_SWP_EXCLUSIVE;
+	return pte;
+}
+
+static inline pte_t pte_swp_clear_exclusive(pte_t pte)
+{
+	pte_val(pte) &= ~_PAGE_SWP_EXCLUSIVE;
+	return pte;
+}
+
 extern unsigned long iopa(unsigned long addr);
 
 /* Values for nocacheflag and cmode */
-- 
2.39.0