[v9,20/51] powerpc: introduce get_mm_addr_key() helper

Message ID 1509958663-18737-21-git-send-email-linuxram@us.ibm.com
State New
Headers show
Series
  • powerpc, mm: Memory Protection Keys
Related show

Commit Message

Ram Pai Nov. 6, 2017, 8:57 a.m.
get_mm_addr_key() helper returns the pkey associated with
an address corresponding to a given mm_struct.

Signed-off-by: Ram Pai <linuxram@us.ibm.com>
---
 arch/powerpc/include/asm/mmu.h  |    9 +++++++++
 arch/powerpc/mm/hash_utils_64.c |   24 ++++++++++++++++++++++++
 2 files changed, 33 insertions(+), 0 deletions(-)

Patch

diff --git a/arch/powerpc/include/asm/mmu.h b/arch/powerpc/include/asm/mmu.h
index 6364f5c..bb38312 100644
--- a/arch/powerpc/include/asm/mmu.h
+++ b/arch/powerpc/include/asm/mmu.h
@@ -260,6 +260,15 @@  static inline bool early_radix_enabled(void)
 }
 #endif
 
+#ifdef CONFIG_PPC_MEM_KEYS
+extern u16 get_mm_addr_key(struct mm_struct *mm, unsigned long address);
+#else
+static inline u16 get_mm_addr_key(struct mm_struct *mm, unsigned long address)
+{
+	return 0;
+}
+#endif /* CONFIG_PPC_MEM_KEYS */
+
 #endif /* !__ASSEMBLY__ */
 
 /* The kernel use the constants below to index in the page sizes array.
diff --git a/arch/powerpc/mm/hash_utils_64.c b/arch/powerpc/mm/hash_utils_64.c
index ddfc673..0108d12 100644
--- a/arch/powerpc/mm/hash_utils_64.c
+++ b/arch/powerpc/mm/hash_utils_64.c
@@ -1575,6 +1575,30 @@  void hash_preload(struct mm_struct *mm, unsigned long ea,
 	local_irq_restore(flags);
 }
 
+#ifdef CONFIG_PPC_MEM_KEYS
+/*
+ * Return the protection key associated with the given address and the
+ * mm_struct.
+ */
+u16 get_mm_addr_key(struct mm_struct *mm, unsigned long address)
+{
+	pte_t *ptep;
+	u16 pkey = 0;
+	unsigned long flags;
+
+	if (!mm || !mm->pgd)
+		return 0;
+
+	local_irq_save(flags);
+	ptep = find_linux_pte(mm->pgd, address, NULL, NULL);
+	if (ptep)
+		pkey = pte_to_pkey_bits(pte_val(READ_ONCE(*ptep)));
+	local_irq_restore(flags);
+
+	return pkey;
+}
+#endif /* CONFIG_PPC_MEM_KEYS */
+
 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
 static inline void tm_flush_hash_page(int local)
 {