OMAP: TILER: Added 1D area allocation + memory pinning operations

Added new tiler kernel methods:

tiler_alloc_block_area() allocates a 1D container area of certain size
tiler_pin_memory() can pin memory-backing to a 1D container area (or replace
its previous mapping)
tiler_unpin_memory() clears the memory-backing of a 1D container area

tiler_free_block() can be still used to free the container area.

Signed-off-by: Lajos Molnar <molnar@ti.com>

1 files changed, 37 insertions, 8 deletions

diff --git a/drivers/media/video/tiler/tiler-main.c b/drivers/media/video/tiler/tiler-main.c
index c6e729d3c57..ede63bfd702 100644
--- a/drivers/media/video/tiler/tiler-main.c
+++ b/drivers/media/video/tiler/tiler-main.c
@@ -558,18 +558,13 @@ static s32 lay_nv12(int n, u16 w, u16 w1, u16 h, struct gid_info *gi, u8 *p)
         return n;
 }
 
-/* (must have mutex) free block and any freed areas */
-static s32 _m_free(struct mem_info *mi)
+static void _m_unpin(struct mem_info *mi)
 {
-        struct area_info *ai = NULL;
-        struct page *page = NULL;
-        s32 res = 0;
-        u32 i;
-
         /* release memory */
         if (mi->pa.memtype == TILER_MEM_GOT_PAGES) {
+                int i;
                 for (i = 0; i < mi->pa.num_pg; i++) {
-                        page = phys_to_page(mi->pa.mem[i]);
+                        struct page *page = phys_to_page(mi->pa.mem[i]);
                         if (page) {
                                 if (!PageReserved(page))
                                         SetPageDirty(page);
@@ -585,7 +580,18 @@ static s32 _m_free(struct mem_info *mi)
                 mi->pa.mem = NULL;
         }
         kfree(mi->pa.mem);
+        mi->pa.mem = NULL;
+        mi->pa.num_pg = 0;
         clear_pat(tmm[tiler_fmt(mi->blk.phys)], &mi->area);
+}
+
+/* (must have mutex) free block and any freed areas */
+static s32 _m_free(struct mem_info *mi)
+{
+        struct area_info *ai = NULL;
+        s32 res = 0;
+
+        _m_unpin(mi);
 
         /* safe deletion as list may not have been assigned */
         if (mi->global.next)
@@ -1378,6 +1384,29 @@ void tiler_free_block(tiler_blk_handle block)
 }
 EXPORT_SYMBOL(tiler_free_block);
 
+tiler_blk_handle tiler_alloc_block_area(u32 size)
+{
+        return alloc_block_area(TILFMT_PAGE, size >> PAGE_SHIFT, 1, 0, 0, 0, 0,
+                                                        __get_pi(0, true));
+}
+EXPORT_SYMBOL(tiler_alloc_block_area);
+
+void tiler_unpin_memory(tiler_blk_handle block)
+{
+        mutex_lock(&mtx);
+        _m_unpin(block);
+        mutex_unlock(&mtx);
+}
+EXPORT_SYMBOL(tiler_unpin_memory);
+
+s32 tiler_pin_memory(tiler_blk_handle block, struct tiler_pa_info *pa)
+{
+        struct tiler_pa_info *pa_tmp = kmemdup(pa, sizeof(*pa), GFP_KERNEL);
+        tiler_unpin_memory(block);
+        return pin_memory(block, pa_tmp);
+}
+EXPORT_SYMBOL(tiler_pin_memory);
+
 MODULE_LICENSE("GPL v2");
 MODULE_AUTHOR("Lajos Molnar <molnar@ti.com>");
 MODULE_AUTHOR("David Sin <davidsin@ti.com>");