[PATCH v4 2/3] drm/nouveau/disp: Move tiling functions to dispnv50/tile.h

[Jocelyn Falempe]

Refactor, and move the tiling geometry functions to dispnv50/tile.h,
so they can be re-used by drm_panic.
No functional impact.

Signed-off-by: Jocelyn Falempe <jfalempe at redhat.com>
---

 drivers/gpu/drm/nouveau/dispnv50/tile.h   | 63 +++++++++++++++++++++++
 drivers/gpu/drm/nouveau/nouveau_display.c | 59 ++++-----------------
 2 files changed, 73 insertions(+), 49 deletions(-)
 create mode 100644 drivers/gpu/drm/nouveau/dispnv50/tile.h

diff --git a/drivers/gpu/drm/nouveau/dispnv50/tile.h b/drivers/gpu/drm/nouveau/dispnv50/tile.h
new file mode 100644
index 0000000000000..e8769d1886b11
--- /dev/null
+++ b/drivers/gpu/drm/nouveau/dispnv50/tile.h
@@ -0,0 +1,63 @@
+/* SPDX-License-Identifier: MIT */
+#ifndef __NV50_TILE_H__
+#define __NV50_TILE_H__
+
+#include <linux/types.h>
+#include <linux/math.h>
+
+/*
+ * Tiling parameters for NV50+.
+ * GOB = Group of bytes, the main unit for tiling blocks.
+ * Tiling blocks are a power of 2 number of GOB.
+ * All GOBs and blocks have the same width: 64 bytes (so 16 pixels in 32bits).
+ * tile_mode is the log2 of the number of GOB per block.
+ */
+
+#define NV_TILE_GOB_HEIGHT_TESLA 4	/* 4 x 64 bytes = 256 bytes for a GOB on Tesla*/
+#define NV_TILE_GOB_HEIGHT 8		/* 8 x 64 bytes = 512 bytes for a GOB on Fermi and later */
+#define NV_TILE_GOB_WIDTH_BYTES 64
+
+/* Number of blocks to cover the width of the framebuffer */
+static inline u32 nouveau_get_width_in_blocks(u32 stride)
+{
+	return DIV_ROUND_UP(stride, NV_TILE_GOB_WIDTH_BYTES);
+}
+
+/* Return the height in pixel of one GOB */
+static inline u32 nouveau_get_gob_height(u16 family)
+{
+	if (family == NV_DEVICE_INFO_V0_TESLA)
+		return NV_TILE_GOB_HEIGHT_TESLA;
+	else
+		return NV_TILE_GOB_HEIGHT;
+}
+
+/* Number of blocks to cover the heigth of the framebuffer */
+static inline u32 nouveau_get_height_in_blocks(u32 height, u32 gobs_in_block, u16 family)
+{
+	return DIV_ROUND_UP(height, nouveau_get_gob_height(family) * gobs_in_block);
+}
+
+/* Return the GOB size in bytes */
+static inline u32 nouveau_get_gob_size(u16 family)
+{
+	return nouveau_get_gob_height(family) * NV_TILE_GOB_WIDTH_BYTES;
+}
+
+/* Return the number of GOB in a block */
+static inline int nouveau_get_gobs_in_block(u32 tile_mode, u16 chipset)
+{
+	if (chipset >= 0xc0)
+		return 1 << (tile_mode >> 4);
+	return 1 << tile_mode;
+}
+
+/* Return true if tile_mode is invalid */
+static inline bool nouveau_check_tile_mode(u32 tile_mode, u16 chipset)
+{
+	if (chipset >= 0xc0)
+		return (tile_mode & 0xfffff0f);
+	return (tile_mode & 0xfffffff0);
+}
+
+#endif
diff --git a/drivers/gpu/drm/nouveau/nouveau_display.c b/drivers/gpu/drm/nouveau/nouveau_display.c
index 619a3efbe8c88..add006fc8d818 100644
--- a/drivers/gpu/drm/nouveau/nouveau_display.c
+++ b/drivers/gpu/drm/nouveau/nouveau_display.c
@@ -44,6 +44,7 @@
 #include <nvif/if0011.h>
 #include <nvif/if0013.h>
 #include <dispnv50/crc.h>
+#include <dispnv50/tile.h>
 
 int
 nouveau_display_vblank_enable(struct drm_crtc *crtc)
@@ -220,69 +221,29 @@ nouveau_validate_decode_mod(struct nouveau_drm *drm,
 	return 0;
 }
 
-static inline uint32_t
-nouveau_get_width_in_blocks(uint32_t stride)
-{
-	/* GOBs per block in the x direction is always one, and GOBs are
-	 * 64 bytes wide
-	 */
-	static const uint32_t log_block_width = 6;
-
-	return (stride + (1 << log_block_width) - 1) >> log_block_width;
-}
-
-static inline uint32_t
-nouveau_get_height_in_blocks(struct nouveau_drm *drm,
-			     uint32_t height,
-			     uint32_t log_block_height_in_gobs)
-{
-	uint32_t log_gob_height;
-	uint32_t log_block_height;
-
-	BUG_ON(drm->client.device.info.family < NV_DEVICE_INFO_V0_TESLA);
-
-	if (drm->client.device.info.family < NV_DEVICE_INFO_V0_FERMI)
-		log_gob_height = 2;
-	else
-		log_gob_height = 3;
-
-	log_block_height = log_block_height_in_gobs + log_gob_height;
-
-	return (height + (1 << log_block_height) - 1) >> log_block_height;
-}
-
 static int
 nouveau_check_bl_size(struct nouveau_drm *drm, struct nouveau_bo *nvbo,
 		      uint32_t offset, uint32_t stride, uint32_t h,
 		      uint32_t tile_mode)
 {
-	uint32_t gob_size, bw, bh;
+	uint32_t gob_size, bw, bh, gobs_in_block;
 	uint64_t bl_size;
 
 	BUG_ON(drm->client.device.info.family < NV_DEVICE_INFO_V0_TESLA);
 
-	if (drm->client.device.info.chipset >= 0xc0) {
-		if (tile_mode & 0xF)
-			return -EINVAL;
-		tile_mode >>= 4;
-	}
-
-	if (tile_mode & 0xFFFFFFF0)
+	if (nouveau_check_tile_mode(tile_mode, drm->client.device.info.chipset))
 		return -EINVAL;
 
-	if (drm->client.device.info.family < NV_DEVICE_INFO_V0_FERMI)
-		gob_size = 256;
-	else
-		gob_size = 512;
-
+	gobs_in_block = nouveau_get_gobs_in_block(tile_mode, drm->client.device.info.chipset);
 	bw = nouveau_get_width_in_blocks(stride);
-	bh = nouveau_get_height_in_blocks(drm, h, tile_mode);
+	bh = nouveau_get_height_in_blocks(h, gobs_in_block, drm->client.device.info.family);
+	gob_size = nouveau_get_gob_size(drm->client.device.info.family);
 
-	bl_size = bw * bh * (1 << tile_mode) * gob_size;
+	bl_size = bw * bh * gobs_in_block * gob_size;
 
-	DRM_DEBUG_KMS("offset=%u stride=%u h=%u tile_mode=0x%02x bw=%u bh=%u gob_size=%u bl_size=%llu size=%zu\n",
-		      offset, stride, h, tile_mode, bw, bh, gob_size, bl_size,
-		      nvbo->bo.base.size);
+	DRM_DEBUG_KMS("offset=%u stride=%u h=%u gobs_in_block=%u bw=%u bh=%u gob_size=%u bl_size=%llu size=%zu\n",
+		      offset, stride, h, gobs_in_block, bw, bh, gob_size,
+		      bl_size, nvbo->bo.base.size);
 
 	if (bl_size + offset > nvbo->bo.base.size)
 		return -ERANGE;
-- 
2.47.0