1 files changed, 66 insertions, 3 deletions

diff --git a/arch/powerpc/platforms/powernv/opal.c b/arch/powerpc/platforms/powernv/opal.c
index 49d2f00019e5..360ad80c754c 100644
--- a/arch/powerpc/platforms/powernv/opal.c
+++ b/arch/powerpc/platforms/powernv/opal.c
@@ -242,14 +242,14 @@ void opal_notifier_update_evt(uint64_t evt_mask,
 void opal_notifier_enable(void)
 {
         int64_t rc;
-        uint64_t evt = 0;
+        __be64 evt = 0;
 
         atomic_set(&opal_notifier_hold, 0);
 
         /* Process pending events */
         rc = opal_poll_events(&evt);
         if (rc == OPAL_SUCCESS && evt)
-                opal_do_notifier(evt);
+                opal_do_notifier(be64_to_cpu(evt));
 }
 
 void opal_notifier_disable(void)
@@ -529,7 +529,7 @@ static irqreturn_t opal_interrupt(int irq, void *data)
 
         opal_handle_interrupt(virq_to_hw(irq), &events);
 
-        opal_do_notifier(events);
+        opal_do_notifier(be64_to_cpu(events));
 
         return IRQ_HANDLED;
 }
@@ -638,3 +638,66 @@ void opal_shutdown(void)
 
 /* Export this so that test modules can use it */
 EXPORT_SYMBOL_GPL(opal_invalid_call);
+
+/* Convert a region of vmalloc memory to an opal sg list */
+struct opal_sg_list *opal_vmalloc_to_sg_list(void *vmalloc_addr,
+                                             unsigned long vmalloc_size)
+{
+        struct opal_sg_list *sg, *first = NULL;
+        unsigned long i = 0;
+
+        sg = kzalloc(PAGE_SIZE, GFP_KERNEL);
+        if (!sg)
+                goto nomem;
+
+        first = sg;
+
+        while (vmalloc_size > 0) {
+                uint64_t data = vmalloc_to_pfn(vmalloc_addr) << PAGE_SHIFT;
+                uint64_t length = min(vmalloc_size, PAGE_SIZE);
+
+                sg->entry[i].data = cpu_to_be64(data);
+                sg->entry[i].length = cpu_to_be64(length);
+                i++;
+
+                if (i >= SG_ENTRIES_PER_NODE) {
+                        struct opal_sg_list *next;
+
+                        next = kzalloc(PAGE_SIZE, GFP_KERNEL);
+                        if (!next)
+                                goto nomem;
+
+                        sg->length = cpu_to_be64(
+                                        i * sizeof(struct opal_sg_entry) + 16);
+                        i = 0;
+                        sg->next = cpu_to_be64(__pa(next));
+                        sg = next;
+                }
+
+                vmalloc_addr += length;
+                vmalloc_size -= length;
+        }
+
+        sg->length = cpu_to_be64(i * sizeof(struct opal_sg_entry) + 16);
+
+        return first;
+
+nomem:
+        pr_err("%s : Failed to allocate memory\n", __func__);
+        opal_free_sg_list(first);
+        return NULL;
+}
+
+void opal_free_sg_list(struct opal_sg_list *sg)
+{
+        while (sg) {
+                uint64_t next = be64_to_cpu(sg->next);
+
+                kfree(sg);
+
+                if (next)
+                        sg = __va(next);
+                else
+                        sg = NULL;
+        }
+}