[for-4.8][PATCH v2 23/23] xen/arm: p2m: Export p2m_*_lock helpers

[Julien Grall <julien.grall@arm.com>]

Earlier patches exported the p2m interface (p2m_get_entry and
p2m_set_entry) to allow splitting xen/arch/arm/p2m.c. Those functions
require the callers to lock the p2m, so we need to export p2m_*_lock
helpers.

All helpers but p2m_write_unlock but p2m_write_unlock are moved in
xen/include/asm-arm/p2m.h to allow inlining. The helpers
p2m_write_unlock is kept in p2m.c because it depends on a static
function.

Signed-off-by: Julien Grall <julien.grall@arm.com>

---
    Changes in v2:
        - Patch added
---
 xen/arch/arm/p2m.c        | 28 ++--------------------------
 xen/include/asm-arm/p2m.h | 27 +++++++++++++++++++++++++++
 2 files changed, 29 insertions(+), 26 deletions(-)

diff --git a/xen/arch/arm/p2m.c b/xen/arch/arm/p2m.c
index c1dac09..fa08e06 100644
--- a/xen/arch/arm/p2m.c
+++ b/xen/arch/arm/p2m.c
@@ -60,11 +60,6 @@ static inline bool p2m_is_superpage(lpae_t pte, unsigned int level)
     return (level < 3) && p2m_mapping(pte);
 }
 
-static inline void p2m_write_lock(struct p2m_domain *p2m)
-{
-    write_lock(&p2m->lock);
-}
-
 /*
  * Return the start of the next mapping based on the order of the
  * current one.
@@ -83,7 +78,8 @@ static inline gfn_t gfn_next_boundary(gfn_t gfn, unsigned int order)
 
 static void p2m_flush_tlb(struct p2m_domain *p2m);
 
-static inline void p2m_write_unlock(struct p2m_domain *p2m)
+/* Unlock the flush and do a P2M TLB flush if necessary */
+void p2m_write_unlock(struct p2m_domain *p2m)
 {
     if ( p2m->need_flush )
     {
@@ -99,26 +95,6 @@ static inline void p2m_write_unlock(struct p2m_domain *p2m)
     write_unlock(&p2m->lock);
 }
 
-static inline void p2m_read_lock(struct p2m_domain *p2m)
-{
-    read_lock(&p2m->lock);
-}
-
-static inline void p2m_read_unlock(struct p2m_domain *p2m)
-{
-    read_unlock(&p2m->lock);
-}
-
-static inline int p2m_is_locked(struct p2m_domain *p2m)
-{
-    return rw_is_locked(&p2m->lock);
-}
-
-static inline int p2m_is_write_locked(struct p2m_domain *p2m)
-{
-    return rw_is_write_locked(&p2m->lock);
-}
-
 void p2m_dump_info(struct domain *d)
 {
     struct p2m_domain *p2m = &d->arch.p2m;
diff --git a/xen/include/asm-arm/p2m.h b/xen/include/asm-arm/p2m.h
index cca86ef..1480c5b 100644
--- a/xen/include/asm-arm/p2m.h
+++ b/xen/include/asm-arm/p2m.h
@@ -176,6 +176,33 @@ void p2m_restore_state(struct vcpu *n);
 /* Print debugging/statistial info about a domain's p2m */
 void p2m_dump_info(struct domain *d);
 
+static inline void p2m_write_lock(struct p2m_domain *p2m)
+{
+    write_lock(&p2m->lock);
+}
+
+void p2m_write_unlock(struct p2m_domain *p2m);
+
+static inline void p2m_read_lock(struct p2m_domain *p2m)
+{
+    read_lock(&p2m->lock);
+}
+
+static inline void p2m_read_unlock(struct p2m_domain *p2m)
+{
+    read_unlock(&p2m->lock);
+}
+
+static inline int p2m_is_locked(struct p2m_domain *p2m)
+{
+    return rw_is_locked(&p2m->lock);
+}
+
+static inline int p2m_is_write_locked(struct p2m_domain *p2m)
+{
+    return rw_is_write_locked(&p2m->lock);
+}
+
 /* Look up the MFN corresponding to a domain's GFN. */
 mfn_t p2m_lookup(struct domain *d, gfn_t gfn, p2m_type_t *t);
 
-- 
1.9.1


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