[PATCH RFC 10/17] arm64: text replication: add swapper page directory helpers

[Russell King (Oracle)]

Add a series of helpers for the swapper page directories - a set which
return those for the calling CPU, and those which take the NUMA node
number.

Signed-off-by: Russell King (Oracle) <rmk+kernel at armlinux.org.uk>
---
 arch/arm64/include/asm/pgtable.h | 19 +++++++++++++++++++
 arch/arm64/kernel/hibernate.c    |  2 +-
 arch/arm64/mm/ktext.c            | 20 ++++++++++++++++++++
 3 files changed, 40 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h
index 1e72067d1e9e..5cfff64e4944 100644
--- a/arch/arm64/include/asm/pgtable.h
+++ b/arch/arm64/include/asm/pgtable.h
@@ -627,6 +627,25 @@ extern struct pgtables pgtable_node0;
 
 #ifdef CONFIG_REPLICATE_KTEXT
 extern struct pgtables *pgtables[MAX_NUMNODES];
+
+pgd_t *swapper_pg_dir_node(void);
+phys_addr_t __swapper_pg_dir_node_phys(int nid);
+phys_addr_t swapper_pg_dir_node_phys(void);
+#else
+static inline pgd_t *swapper_pg_dir_node(void)
+{
+	return swapper_pg_dir;
+}
+
+static inline phys_addr_t __swapper_pg_dir_node_phys(int nid)
+{
+	return __pa_symbol(swapper_pg_dir);
+}
+
+static inline phys_addr_t swapper_pg_dir_node_phys(void)
+{
+	return __pa_symbol(swapper_pg_dir);
+}
 #endif
 
 extern void set_swapper_pgd(pgd_t *pgdp, pgd_t pgd);
diff --git a/arch/arm64/kernel/hibernate.c b/arch/arm64/kernel/hibernate.c
index 788597a6b6a2..2236119bf16d 100644
--- a/arch/arm64/kernel/hibernate.c
+++ b/arch/arm64/kernel/hibernate.c
@@ -114,7 +114,7 @@ int arch_hibernation_header_save(void *addr, unsigned int max_size)
 		return -EOVERFLOW;
 
 	arch_hdr_invariants(&hdr->invariants);
-	hdr->ttbr1_el1		= __pa_symbol(swapper_pg_dir);
+	hdr->ttbr1_el1		= swapper_pg_dir_node_phys();
 	hdr->reenter_kernel	= _cpu_resume;
 
 	/* We can't use __hyp_get_vectors() because kvm may still be loaded */
diff --git a/arch/arm64/mm/ktext.c b/arch/arm64/mm/ktext.c
index 85fc97877d75..ac5754972a09 100644
--- a/arch/arm64/mm/ktext.c
+++ b/arch/arm64/mm/ktext.c
@@ -21,6 +21,26 @@ struct pgtables *pgtables[MAX_NUMNODES] = {
 
 static void *kernel_texts[MAX_NUMNODES];
 
+static pgd_t *__swapper_pg_dir_node(int nid)
+{
+	return pgtables[nid]->swapper_pg_dir;
+}
+
+pgd_t *swapper_pg_dir_node(void)
+{
+	return __swapper_pg_dir_node(numa_node_id());
+}
+
+phys_addr_t __swapper_pg_dir_node_phys(int nid)
+{
+	return __pa(__swapper_pg_dir_node(nid));
+}
+
+phys_addr_t swapper_pg_dir_node_phys(void)
+{
+	return __swapper_pg_dir_node_phys(numa_node_id());
+}
+
 void __kprobes ktext_replication_patch(u32 *tp, __le32 insn)
 {
 	unsigned long offset;
-- 
2.30.2