From 3d292d14079e4fd317a4f92df3980d444624aba8 Mon Sep 17 00:00:00 2001
From: =?utf8?q?=E6=9D=9C=E5=9D=A4=E6=98=8E?= <dkm@rockchip.com>
Date: Thu, 1 Sep 2011 10:15:09 +0800
Subject: [PATCH] gpu : add pages pool to avoid alloc_pages failure

---
 .../hal/os/linux/kernel/gc_hal_kernel_os.c    | 38 +++++++++++++++++++
 1 file changed, 38 insertions(+)
 mode change 100644 => 100755 drivers/staging/rk29/vivante/hal/os/linux/kernel/gc_hal_kernel_os.c

diff --git a/drivers/staging/rk29/vivante/hal/os/linux/kernel/gc_hal_kernel_os.c b/drivers/staging/rk29/vivante/hal/os/linux/kernel/gc_hal_kernel_os.c
old mode 100644
new mode 100755
index ae77f39a1b82..96fc28b69930
--- a/drivers/staging/rk29/vivante/hal/os/linux/kernel/gc_hal_kernel_os.c
+++ b/drivers/staging/rk29/vivante/hal/os/linux/kernel/gc_hal_kernel_os.c
@@ -143,6 +143,9 @@ struct _gckOS
     gctINT                      cacheNum;
     gcsMapedNonPagedCache *     cacheHead;
     gcsMapedNonPagedCache *     cacheTail;
+
+    gctINT                      pageNum;
+    struct page *               pageCache[100];
 #endif
 };
 
@@ -526,6 +529,13 @@ gckOS_Construct(
     os->signal.currentID = 0;
 #endif
 
+#if gcdkUSE_MAPED_NONPAGE_CACHE
+    for(os->pageNum=0; os->pageNum<50; os->pageNum++) {
+        os->pageCache[os->pageNum] = alloc_pages(GFP_KERNEL | GFP_DMA, get_order(5 * PAGE_SIZE));
+    }
+    //printk("os->pageNum = %d\n", os->pageNum);
+#endif
+
     /* Return pointer to the gckOS object. */
     *Os = os;
 
@@ -601,6 +611,12 @@ gckOS_Destroy(
 // dkm : gcdkUSE_MAPED_NONPAGE_CACHE
 #if gcdkUSE_MAPED_NONPAGE_CACHE
     _FreeAllMapedNonPagedCache(Os, 0);
+
+    for(i=0; i<Os->pageNum; i++) {
+        if(Os->pageCache[i]) {
+            free_pages((unsigned long)page_address(Os->pageCache[i]), get_order(5 * PAGE_SIZE));
+        }
+    }
 #endif
 
 #if !USE_NEW_LINUX_SIGNAL
@@ -1496,7 +1512,19 @@ gckOS_AllocateNonPagedMemory(
 #else
     size    = mdl->numPages * PAGE_SIZE;
     order   = get_order(size);
+    
+#if gcdkUSE_MAPED_NONPAGE_CACHE
+    if(5==mdl->numPages && Os->pageNum>0 && Os->pageCache[Os->pageNum-1]) {
+        Os->pageNum--;
+        page    = Os->pageCache[Os->pageNum];
+        Os->pageCache[Os->pageNum] = gcvNULL;
+        //printk("pop pages, os->pageNum = %d\n", Os->pageNum);
+    } else {
+        page    = alloc_pages(GFP_KERNEL | GFP_DMA, order);
+    }
+#else
     page    = alloc_pages(GFP_KERNEL | GFP_DMA, order);
+#endif
 
     if (page == gcvNULL)
     {
@@ -1833,7 +1861,17 @@ gceSTATUS gckOS_FreeNonPagedMemoryRealy(
         size    -= PAGE_SIZE;
     }
 
+#if gcdkUSE_MAPED_NONPAGE_CACHE
+    if(5==mdl->numPages && Os->pageNum<100 && !Os->pageCache[Os->pageNum]) {
+        Os->pageCache[Os->pageNum] = virt_to_page(mdl->kaddr);
+        Os->pageNum ++;
+        //printk("push pages, os->pageNum = %d\n", Os->pageNum);
+    } else {
+        free_pages((unsigned long)mdl->kaddr, get_order(mdl->numPages * PAGE_SIZE));
+    }
+#else
     free_pages((unsigned long)mdl->kaddr, get_order(mdl->numPages * PAGE_SIZE));
+#endif
 
     iounmap(mdl->addr);
 #endif /* NO_DMA_COHERENT */
-- 
2.34.1