drm/nv50: make the blocksize depend on vram size

- This should be better than what we have now.
- I'm less sure about the non power of two path.

Signed-off-by: Maarten Maathuis <madman2003@gmail.com>

diff --git a/drivers/gpu/drm/nouveau/nouveau_bo.c b/drivers/gpu/drm/nouveau/nouveau_bo.c
index a0c9e00..e342a41 100644 (file)
--- a/drivers/gpu/drm/nouveau/nouveau_bo.c
+++ b/drivers/gpu/drm/nouveau/nouveau_bo.c
@@ -33,6 +33,8 @@
 #include "nouveau_drv.h"
 #include "nouveau_dma.h"
 
+#include <linux/log2.h>
+
 static void
 nouveau_bo_del_ttm(struct ttm_buffer_object *bo)
 {
@@ -67,29 +69,29 @@ nouveau_bo_fixup_align(struct drm_device *dev,
         * avoid corruption of other buffer objects.
         */
        if (dev_priv->card_type == NV_50) {
+               uint32_t block_size = nouveau_mem_fb_amount(dev) >> 15;
+               int i;
+
                switch (tile_flags) {
                case 0x1800:
                case 0x2800:
                case 0x4800:
                case 0x7a00:
-                       if (dev_priv->chipset >= 0xA0) {
-                               *size = roundup(*size, 28672);
-                               /* This is based on high end cards with 448 bits
-                                * memory bus, could be different elsewhere.*/
-                               *size += 6 * 28672;
-                               /* 8 * 28672 is the actual alignment requirement
-                                * but we must also align to page size. */
-                               *align = 2 * 8 * 28672;
-                       } else if (dev_priv->chipset >= 0x90) {
-                               *size = roundup(*size, 16384);
-                               *size += 3 * 16384;
-                               *align = 12 * 16384;
+                       *size = roundup(*size, block_size);
+                       if (is_power_of_2(block_size)) {
+                               *size += 3 * block_size;
+                               for (i = 1; i < 10; i++) {
+                                       *align = 12 * i * block_size;
+                                       if (!(*align % 65536))
+                                               break;
+                               }
                        } else {
-                               *size = roundup(*size, 8192);
-                               *size += 3 * 8192;
-                               /* 12 * 8192 is the actual alignment requirement
-                                * but we must also align to page size. */
-                               *align = 2 * 12 * 8192;
+                               *size += 6 * block_size;
+                               for (i = 1; i < 10; i++) {
+                                       *align = 8 * i * block_size;
+                                       if (!(*align % 65536))
+                                               break;
+                               }
                        }
                        break;
                default: