[PATCH 3/3] drm/nouveau: Support NVIDIA format modifiers

[James Jones <jajones@nvidia.com>]

Allow setting the block layout of a nouveau FB
object using DRM format modifiers.  When
specified, the format modifier block layout and
kind overrides the GEM buffer's implicit layout
and kind.  The specified format modifier is
validated against he list of modifiers supported
by the target display hardware.

Signed-off-by: James Jones <jajones@nvidia.com>
---
 drivers/gpu/drm/nouveau/dispnv50/wndw.c   |  8 +--
 drivers/gpu/drm/nouveau/nouveau_display.c | 65 ++++++++++++++++++++++-
 drivers/gpu/drm/nouveau/nouveau_display.h |  2 +
 3 files changed, 69 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/nouveau/dispnv50/wndw.c b/drivers/gpu/drm/nouveau/dispnv50/wndw.c
index 70ad64cb2d34..06c1b18479c1 100644
--- a/drivers/gpu/drm/nouveau/dispnv50/wndw.c
+++ b/drivers/gpu/drm/nouveau/dispnv50/wndw.c
@@ -43,7 +43,7 @@ nv50_wndw_ctxdma_new(struct nv50_wndw *wndw, struct nouveau_framebuffer *fb)
 {
 	struct nouveau_drm *drm = nouveau_drm(fb->base.dev);
 	struct nv50_wndw_ctxdma *ctxdma;
-	const u8    kind = fb->nvbo->kind;
+	const u8    kind = fb->kind;
 	const u32 handle = 0xfb000000 | kind;
 	struct {
 		struct nv_dma_v0 base;
@@ -243,7 +243,7 @@ nv50_wndw_atomic_check_acquire(struct nv50_wndw *wndw, bool modeset,
 	if (asyw->state.fb != armw->state.fb || !armw->visible || modeset) {
 		asyw->image.w = fb->base.width;
 		asyw->image.h = fb->base.height;
-		asyw->image.kind = fb->nvbo->kind;
+		asyw->image.kind = fb->kind;
 
 		ret = nv50_wndw_atomic_check_acquire_rgb(asyw);
 		if (ret) {
@@ -255,9 +255,9 @@ nv50_wndw_atomic_check_acquire(struct nv50_wndw *wndw, bool modeset,
 		if (asyw->image.kind) {
 			asyw->image.layout = 0;
 			if (drm->client.device.info.chipset >= 0xc0)
-				asyw->image.blockh = fb->nvbo->mode >> 4;
+				asyw->image.blockh = fb->tile_mode >> 4;
 			else
-				asyw->image.blockh = fb->nvbo->mode;
+				asyw->image.blockh = fb->tile_mode;
 			asyw->image.blocks[0] = fb->base.pitches[0] / 64;
 			asyw->image.pitch[0] = 0;
 		} else {
diff --git a/drivers/gpu/drm/nouveau/nouveau_display.c b/drivers/gpu/drm/nouveau/nouveau_display.c
index f1509392d7b7..351b58410e1a 100644
--- a/drivers/gpu/drm/nouveau/nouveau_display.c
+++ b/drivers/gpu/drm/nouveau/nouveau_display.c
@@ -224,6 +224,50 @@ static const struct drm_framebuffer_funcs nouveau_framebuffer_funcs = {
 	.create_handle = nouveau_user_framebuffer_create_handle,
 };
 
+static int
+nouveau_decode_mod(struct nouveau_drm *drm,
+		   uint64_t modifier,
+		   uint32_t *tile_mode,
+		   uint8_t *kind)
+{
+	struct nouveau_display *disp = nouveau_display(drm->dev);
+	int mod;
+
+	BUG_ON(!tile_mode || !kind);
+
+	if (drm->client.device.info.chipset < 0x50) {
+		return -EINVAL;
+	}
+
+	BUG_ON(!disp->format_modifiers);
+
+	for (mod = 0;
+	     (disp->format_modifiers[mod] != DRM_FORMAT_MOD_INVALID) &&
+	     (disp->format_modifiers[mod] != modifier);
+	     mod++);
+
+	if (disp->format_modifiers[mod] == DRM_FORMAT_MOD_INVALID)
+		return -EINVAL;
+
+	if (modifier == DRM_FORMAT_MOD_LINEAR) {
+		/* tile_mode will not be used in this case */
+		*tile_mode = 0;
+		*kind = 0;
+	} else {
+		/*
+		 * Extract the block height and kind from the corresponding
+		 * modifier fields.  See drm_fourcc.h for details.
+		 */
+		*tile_mode = (uint32_t)(modifier & 0xF);
+		*kind = (uint8_t)((modifier >> 12) & 0xFF);
+
+		if (drm->client.device.info.chipset >= 0xc0)
+			*tile_mode <<= 4;
+	}
+
+	return 0;
+}
+
 static inline uint32_t
 nouveau_get_width_in_blocks(uint32_t stride)
 {
@@ -300,6 +344,8 @@ nouveau_framebuffer_new(struct drm_device *dev,
 	struct nouveau_framebuffer *fb;
 	const struct drm_format_info *info;
 	unsigned int width, height, i;
+	uint32_t tile_mode;
+	uint8_t kind;
 	int ret;
 
         /* YUV overlays have special requirements pre-NV50 */
@@ -322,6 +368,18 @@ nouveau_framebuffer_new(struct drm_device *dev,
 		return -EINVAL;
 	}
 
+	if (mode_cmd->flags & DRM_MODE_FB_MODIFIERS) {
+		if (nouveau_decode_mod(drm, mode_cmd->modifier[0], &tile_mode,
+				       &kind)) {
+			DRM_DEBUG_KMS("Unsupported modifier: 0x%llx\n",
+				      mode_cmd->modifier[0]);
+			return -EINVAL;
+		}
+	} else {
+		tile_mode = nvbo->mode;
+		kind = nvbo->kind;
+	}
+
 	info = drm_get_format_info(dev, mode_cmd);
 
 	for (i = 0; i < info->num_planes; i++) {
@@ -332,11 +390,11 @@ nouveau_framebuffer_new(struct drm_device *dev,
 						      mode_cmd->height,
 						      i);
 
-		if (nvbo->kind) {
+		if (kind) {
 			ret = nouveau_check_bl_size(drm, nvbo,
 						    mode_cmd->offsets[i],
 						    mode_cmd->pitches[i],
-						    height, nvbo->mode);
+						    height, tile_mode);
 			if (ret)
 				return ret;
 		} else {
@@ -352,6 +410,8 @@ nouveau_framebuffer_new(struct drm_device *dev,
 
 	drm_helper_mode_fill_fb_struct(dev, &fb->base, mode_cmd);
 	fb->nvbo = nvbo;
+	fb->tile_mode = tile_mode;
+	fb->kind = kind;
 
 	ret = drm_framebuffer_init(dev, &fb->base, &nouveau_framebuffer_funcs);
 	if (ret)
@@ -625,6 +685,7 @@ nouveau_display_create(struct drm_device *dev)
 
 	dev->mode_config.preferred_depth = 24;
 	dev->mode_config.prefer_shadow = 1;
+	dev->mode_config.allow_fb_modifiers = true;
 
 	if (drm->client.device.info.chipset < 0x11)
 		dev->mode_config.async_page_flip = false;
diff --git a/drivers/gpu/drm/nouveau/nouveau_display.h b/drivers/gpu/drm/nouveau/nouveau_display.h
index c54682f00b01..0dad57b21983 100644
--- a/drivers/gpu/drm/nouveau/nouveau_display.h
+++ b/drivers/gpu/drm/nouveau/nouveau_display.h
@@ -15,6 +15,8 @@ struct nouveau_framebuffer {
 	u32 r_handle;
 	u32 r_format;
 	u32 r_pitch;
+	u32 tile_mode;
+	u8 kind;
 	struct nvif_object h_base[4];
 	struct nvif_object h_core;
 };
-- 
2.17.1

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