powerpc/powernv: Move SG list structure to header file

Move SG list and entry structure to header file so that
it can be used in other places as well.

Signed-off-by: Vasant Hegde <hegdevasant@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

diff --git a/arch/powerpc/include/asm/opal.h b/arch/powerpc/include/asm/opal.h
index ffb2036..0a2ac85 100644 (file)
--- a/arch/powerpc/include/asm/opal.h
+++ b/arch/powerpc/include/asm/opal.h
@@ -33,6 +33,28 @@ struct opal_takeover_args {
        u64     rd_loc;                 /* r11 */
 };
 
+/*
+ * SG entry
+ *
+ * WARNING: The current implementation requires each entry
+ * to represent a block that is 4k aligned *and* each block
+ * size except the last one in the list to be as well.
+ */
+struct opal_sg_entry {
+       void    *data;
+       long    length;
+};
+
+/* sg list */
+struct opal_sg_list {
+       unsigned long num_entries;
+       struct opal_sg_list *next;
+       struct opal_sg_entry entry[];
+};
+
+/* We calculate number of sg entries based on PAGE_SIZE */
+#define SG_ENTRIES_PER_NODE ((PAGE_SIZE - 16) / sizeof(struct opal_sg_entry))
+
 extern long opal_query_takeover(u64 *hal_size, u64 *hal_align);
 
 extern long opal_do_takeover(struct opal_takeover_args *args);

diff --git a/arch/powerpc/platforms/powernv/opal-flash.c b/arch/powerpc/platforms/powernv/opal-flash.c
index 6ffa6b1..4aeae4f 100644 (file)
--- a/arch/powerpc/platforms/powernv/opal-flash.c
+++ b/arch/powerpc/platforms/powernv/opal-flash.c
@@ -103,27 +103,6 @@ struct image_header_t {
        uint32_t        size;
 };
 
-/* Scatter/gather entry */
-struct opal_sg_entry {
-       void    *data;
-       long    length;
-};
-
-/* We calculate number of entries based on PAGE_SIZE */
-#define SG_ENTRIES_PER_NODE ((PAGE_SIZE - 16) / sizeof(struct opal_sg_entry))
-
-/*
- * This struct is very similar but not identical to that
- * needed by the opal flash update. All we need to do for
- * opal is rewrite num_entries into a version/length and
- * translate the pointers to absolute.
- */
-struct opal_sg_list {
-       unsigned long num_entries;
-       struct opal_sg_list *next;
-       struct opal_sg_entry entry[SG_ENTRIES_PER_NODE];
-};
-
 struct validate_flash_t {
        int             status;         /* Return status */
        void            *buf;           /* Candiate image buffer */
@@ -333,7 +312,7 @@ static struct opal_sg_list *image_data_to_sglist(void)
        addr = image_data.data;
        size = image_data.size;
 
-       sg1 = kzalloc((sizeof(struct opal_sg_list)), GFP_KERNEL);
+       sg1 = kzalloc(PAGE_SIZE, GFP_KERNEL);
        if (!sg1)
                return NULL;
 
@@ -351,8 +330,7 @@ static struct opal_sg_list *image_data_to_sglist(void)
 
                sg1->num_entries++;
                if (sg1->num_entries >= SG_ENTRIES_PER_NODE) {
-                       sg1->next = kzalloc((sizeof(struct opal_sg_list)),
-                                           GFP_KERNEL);
+                       sg1->next = kzalloc(PAGE_SIZE, GFP_KERNEL);
                        if (!sg1->next) {
                                pr_err("%s : Failed to allocate memory\n",
                                       __func__);
@@ -402,7 +380,10 @@ static int opal_flash_update(int op)
                else
                        sg->next = NULL;
 
-               /* Make num_entries into the version/length field */
+               /*
+                * Convert num_entries to version/length format
+                * to satisfy OPAL.
+                */
                sg->num_entries = (SG_LIST_VERSION << 56) |
                        (sg->num_entries * sizeof(struct opal_sg_entry) + 16);
        }