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powerpc/powernv: Move SG list structure to header file

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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>
This commit is contained in:
Vasant Hegde
2013-11-18 16:39:22 +05:30
committed by Benjamin Herrenschmidt
parent 2436636003
commit 7e1ce5a492
2 changed files with 28 additions and 25 deletions
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22
arch/powerpc/include/asm/opal.h
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@@ -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);