drm/nouveau/kms/gf119-: allow both 256- and 1024-sized LUTs to be used

The hardware supports either size. Also add checks to ensure that only
these two sizes may be used for supplying a LUT.
Signed-off-by: Ilia Mirkin <imirkin@alum.mit.edu>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

drivers/gpu/drm/nouveau/dispnv50/base907c.c

@@ -75,12 +75,16 @@ base907c_xlut_set(struct nv50_wndw *wndw, struct nv50_wndw_atom *asyw)
 	}
 }
 
-static void
-base907c_ilut(struct nv50_wndw *wndw, struct nv50_wndw_atom *asyw)
+static bool
+base907c_ilut(struct nv50_wndw *wndw, struct nv50_wndw_atom *asyw, int size)
 {
-	asyw->xlut.i.mode = 7;
+	if (size != 256 && size != 1024)
+		return false;
+
+	asyw->xlut.i.mode = size == 1024 ? 4 : 7;
 	asyw->xlut.i.enable = 2;
 	asyw->xlut.i.load = head907d_olut_load;
+	return true;
 }
 
 static inline u32
@@ -160,6 +164,7 @@ base907c = {
 	.csc_set = base907c_csc_set,
 	.csc_clr = base907c_csc_clr,
 	.olut_core = true,
+	.ilut_size = 1024,
 	.xlut_set = base907c_xlut_set,
 	.xlut_clr = base907c_xlut_clr,
 	.image_set = base907c_image_set,

drivers/gpu/drm/nouveau/dispnv50/head.c

@@ -213,6 +213,7 @@ nv50_head_atomic_check_lut(struct nv50_head *head,
 {
 	struct nv50_disp *disp = nv50_disp(head->base.base.dev);
 	struct drm_property_blob *olut = asyh->state.gamma_lut;
+	int size;
 
 	/* Determine whether core output LUT should be enabled. */
 	if (olut) {
@@ -229,14 +230,23 @@ nv50_head_atomic_check_lut(struct nv50_head *head,
 		}
 	}
 
-	if (!olut && !head->func->olut_identity) {
-		asyh->olut.handle = 0;
-		return 0;
+	if (!olut) {
+		if (!head->func->olut_identity) {
+			asyh->olut.handle = 0;
+			return 0;
+		}
+		size = 0;
+	} else {
+		size = drm_color_lut_size(olut);
 	}
 
+	if (!head->func->olut(head, asyh, size)) {
+		DRM_DEBUG_KMS("Invalid olut\n");
+		return -EINVAL;
+	}
 	asyh->olut.handle = disp->core->chan.vram.handle;
 	asyh->olut.buffer = !asyh->olut.buffer;
-	head->func->olut(head, asyh);
+
 	return 0;
 }
 
@@ -510,11 +520,11 @@ nv50_head_create(struct drm_device *dev, int index)
 	drm_crtc_init_with_planes(dev, crtc, &base->plane, &curs->plane,
 				  &nv50_head_func, "head-%d", head->base.index);
 	drm_crtc_helper_add(crtc, &nv50_head_help);
+	/* Keep the legacy gamma size at 256 to avoid compatibility issues */
 	drm_mode_crtc_set_gamma_size(crtc, 256);
-	if (disp->disp->object.oclass >= GF110_DISP)
-		drm_crtc_enable_color_mgmt(crtc, 256, true, 256);
-	else
-		drm_crtc_enable_color_mgmt(crtc, 0, false, 256);
+	drm_crtc_enable_color_mgmt(crtc, base->func->ilut_size,
+				   disp->disp->object.oclass >= GF110_DISP,
+				   head->func->olut_size);
 
 	if (head->func->olut_set) {
 		ret = nv50_lut_init(disp, &drm->client.mmu, &head->olut);

drivers/gpu/drm/nouveau/dispnv50/head.h

@@ -20,8 +20,9 @@ void nv50_head_flush_clr(struct nv50_head *, struct nv50_head_atom *, bool y);
 struct nv50_head_func {
 	void (*view)(struct nv50_head *, struct nv50_head_atom *);
 	void (*mode)(struct nv50_head *, struct nv50_head_atom *);
-	void (*olut)(struct nv50_head *, struct nv50_head_atom *);
+	bool (*olut)(struct nv50_head *, struct nv50_head_atom *, int);
 	bool olut_identity;
+	int  olut_size;
 	void (*olut_set)(struct nv50_head *, struct nv50_head_atom *);
 	void (*olut_clr)(struct nv50_head *);
 	void (*core_calc)(struct nv50_head *, struct nv50_head_atom *);
@@ -43,7 +44,7 @@ struct nv50_head_func {
 extern const struct nv50_head_func head507d;
 void head507d_view(struct nv50_head *, struct nv50_head_atom *);
 void head507d_mode(struct nv50_head *, struct nv50_head_atom *);
-void head507d_olut(struct nv50_head *, struct nv50_head_atom *);
+bool head507d_olut(struct nv50_head *, struct nv50_head_atom *, int);
 void head507d_core_calc(struct nv50_head *, struct nv50_head_atom *);
 void head507d_core_clr(struct nv50_head *);
 int head507d_curs_layout(struct nv50_head *, struct nv50_wndw_atom *,
@@ -60,7 +61,7 @@ extern const struct nv50_head_func head827d;
 extern const struct nv50_head_func head907d;
 void head907d_view(struct nv50_head *, struct nv50_head_atom *);
 void head907d_mode(struct nv50_head *, struct nv50_head_atom *);
-void head907d_olut(struct nv50_head *, struct nv50_head_atom *);
+bool head907d_olut(struct nv50_head *, struct nv50_head_atom *, int);
 void head907d_olut_set(struct nv50_head *, struct nv50_head_atom *);
 void head907d_olut_clr(struct nv50_head *);
 void head907d_core_set(struct nv50_head *, struct nv50_head_atom *);

drivers/gpu/drm/nouveau/dispnv50/head507d.c

@@ -271,15 +271,19 @@ head507d_olut_load(struct drm_color_lut *in, int size, void __iomem *mem)
 	writew(readw(mem - 4), mem + 4);
 }
 
-void
-head507d_olut(struct nv50_head *head, struct nv50_head_atom *asyh)
+bool
+head507d_olut(struct nv50_head *head, struct nv50_head_atom *asyh, int size)
 {
+	if (size != 256)
+		return false;
+
 	if (asyh->base.cpp == 1)
 		asyh->olut.mode = 0;
 	else
 		asyh->olut.mode = 1;
 
 	asyh->olut.load = head507d_olut_load;
+	return true;
 }
 
 void
@@ -328,6 +332,7 @@ head507d = {
 	.view = head507d_view,
 	.mode = head507d_mode,
 	.olut = head507d_olut,
+	.olut_size = 256,
 	.olut_set = head507d_olut_set,
 	.olut_clr = head507d_olut_clr,
 	.core_calc = head507d_core_calc,

drivers/gpu/drm/nouveau/dispnv50/head827d.c

@@ -108,6 +108,7 @@ head827d = {
 	.view = head507d_view,
 	.mode = head507d_mode,
 	.olut = head507d_olut,
+	.olut_size = 256,
 	.olut_set = head827d_olut_set,
 	.olut_clr = head827d_olut_clr,
 	.core_calc = head507d_core_calc,

drivers/gpu/drm/nouveau/dispnv50/head907d.c

@@ -230,11 +230,15 @@ head907d_olut_load(struct drm_color_lut *in, int size, void __iomem *mem)
 	writew(readw(mem - 4), mem + 4);
 }
 
-void
-head907d_olut(struct nv50_head *head, struct nv50_head_atom *asyh)
+bool
+head907d_olut(struct nv50_head *head, struct nv50_head_atom *asyh, int size)
 {
-	asyh->olut.mode = 7;
+	if (size != 256 && size != 1024)
+		return false;
+
+	asyh->olut.mode = size == 1024 ? 4 : 7;
 	asyh->olut.load = head907d_olut_load;
+	return true;
 }
 
 void
@@ -285,6 +289,7 @@ head907d = {
 	.view = head907d_view,
 	.mode = head907d_mode,
 	.olut = head907d_olut,
+	.olut_size = 1024,
 	.olut_set = head907d_olut_set,
 	.olut_clr = head907d_olut_clr,
 	.core_calc = head507d_core_calc,

drivers/gpu/drm/nouveau/dispnv50/head917d.c

@@ -83,6 +83,7 @@ head917d = {
 	.view = head907d_view,
 	.mode = head907d_mode,
 	.olut = head907d_olut,
+	.olut_size = 1024,
 	.olut_set = head907d_olut_set,
 	.olut_clr = head907d_olut_clr,
 	.core_calc = head507d_core_calc,

drivers/gpu/drm/nouveau/dispnv50/headc37d.c

@@ -148,14 +148,18 @@ headc37d_olut_set(struct nv50_head *head, struct nv50_head_atom *asyh)
 	}
 }
 
-static void
-headc37d_olut(struct nv50_head *head, struct nv50_head_atom *asyh)
+static bool
+headc37d_olut(struct nv50_head *head, struct nv50_head_atom *asyh, int size)
 {
+	if (size != 256 && size != 1024)
+		return false;
+
 	asyh->olut.mode = 2;
-	asyh->olut.size = 0;
+	asyh->olut.size = size == 1024 ? 2 : 0;
 	asyh->olut.range = 0;
 	asyh->olut.output_mode = 1;
 	asyh->olut.load = head907d_olut_load;
+	return true;
 }
 
 static void
@@ -201,6 +205,7 @@ headc37d = {
 	.view = headc37d_view,
 	.mode = headc37d_mode,
 	.olut = headc37d_olut,
+	.olut_size = 1024,
 	.olut_set = headc37d_olut_set,
 	.olut_clr = headc37d_olut_clr,
 	.curs_layout = head917d_curs_layout,

drivers/gpu/drm/nouveau/dispnv50/headc57d.c

@@ -151,17 +151,20 @@ headc57d_olut_load(struct drm_color_lut *in, int size, void __iomem *mem)
 	writew(readw(mem - 4), mem + 4);
 }
 
-void
-headc57d_olut(struct nv50_head *head, struct nv50_head_atom *asyh)
+bool
+headc57d_olut(struct nv50_head *head, struct nv50_head_atom *asyh, int size)
 {
+	if (size != 0 && size != 256 && size != 1024)
+		return false;
+
 	asyh->olut.mode = 2; /* DIRECT10 */
 	asyh->olut.size = 4 /* VSS header. */ + 1024 + 1 /* Entries. */;
 	asyh->olut.output_mode = 1; /* INTERPOLATE_ENABLE. */
-	if (asyh->state.gamma_lut &&
-	    asyh->state.gamma_lut->length / sizeof(struct drm_color_lut) == 256)
+	if (size == 256)
 		asyh->olut.load = headc57d_olut_load_8;
 	else
 		asyh->olut.load = headc57d_olut_load;
+	return true;
 }
 
 static void
@@ -194,6 +197,7 @@ headc57d = {
 	.mode = headc57d_mode,
 	.olut = headc57d_olut,
 	.olut_identity = true,
+	.olut_size = 1024,
 	.olut_set = headc57d_olut_set,
 	.olut_clr = headc57d_olut_clr,
 	.curs_layout = head917d_curs_layout,

drivers/gpu/drm/nouveau/dispnv50/lut.c

@@ -49,7 +49,7 @@ nv50_lut_load(struct nv50_lut *lut, int buffer, struct drm_property_blob *blob,
 			kvfree(in);
 		}
 	} else {
-		load(in, blob->length / sizeof(*in), mem);
+		load(in, drm_color_lut_size(blob), mem);
 	}
 
 	return addr;

drivers/gpu/drm/nouveau/dispnv50/wndw.c

@@ -318,7 +318,7 @@ nv50_wndw_atomic_check_acquire(struct nv50_wndw *wndw, bool modeset,
 	return wndw->func->acquire(wndw, asyw, asyh);
 }
 
-static void
+static int
 nv50_wndw_atomic_check_lut(struct nv50_wndw *wndw,
 			   struct nv50_wndw_atom *armw,
 			   struct nv50_wndw_atom *asyw,
@@ -340,7 +340,7 @@ nv50_wndw_atomic_check_lut(struct nv50_wndw *wndw,
 		 */
 		if (!(ilut = asyh->state.gamma_lut)) {
 			asyw->visible = false;
-			return;
+			return 0;
 		}
 
 		if (wndw->func->ilut)
@@ -359,7 +359,10 @@ nv50_wndw_atomic_check_lut(struct nv50_wndw *wndw,
 	/* Recalculate LUT state. */
 	memset(&asyw->xlut, 0x00, sizeof(asyw->xlut));
 	if ((asyw->ilut = wndw->func->ilut ? ilut : NULL)) {
-		wndw->func->ilut(wndw, asyw);
+		if (!wndw->func->ilut(wndw, asyw, drm_color_lut_size(ilut))) {
+			DRM_DEBUG_KMS("Invalid ilut\n");
+			return -EINVAL;
+		}
 		asyw->xlut.handle = wndw->wndw.vram.handle;
 		asyw->xlut.i.buffer = !asyw->xlut.i.buffer;
 		asyw->set.xlut = true;
@@ -384,6 +387,7 @@ nv50_wndw_atomic_check_lut(struct nv50_wndw *wndw,
 
 	/* Can't do an immediate flip while changing the LUT. */
 	asyh->state.async_flip = false;
+	return 0;
 }
 
 static int
@@ -424,8 +428,11 @@ nv50_wndw_atomic_check(struct drm_plane *plane, struct drm_plane_state *state)
 	    (!armw->visible ||
 	     asyh->state.color_mgmt_changed ||
 	     asyw->state.fb->format->format !=
-	     armw->state.fb->format->format))
-		nv50_wndw_atomic_check_lut(wndw, armw, asyw, asyh);
+	     armw->state.fb->format->format)) {
+		ret = nv50_wndw_atomic_check_lut(wndw, armw, asyw, asyh);
+		if (ret)
+			return ret;
+	}
 
 	/* Calculate new window state. */
 	if (asyw->visible) {

drivers/gpu/drm/nouveau/dispnv50/wndw.h

@@ -64,12 +64,13 @@ struct nv50_wndw_func {
 	void (*ntfy_clr)(struct nv50_wndw *);
 	int (*ntfy_wait_begun)(struct nouveau_bo *, u32 offset,
 			       struct nvif_device *);
-	void (*ilut)(struct nv50_wndw *, struct nv50_wndw_atom *);
+	bool (*ilut)(struct nv50_wndw *, struct nv50_wndw_atom *, int);
 	void (*csc)(struct nv50_wndw *, struct nv50_wndw_atom *,
 		    const struct drm_color_ctm *);
 	void (*csc_set)(struct nv50_wndw *, struct nv50_wndw_atom *);
 	void (*csc_clr)(struct nv50_wndw *);
 	bool ilut_identity;
+	int  ilut_size;
 	bool olut_core;
 	void (*xlut_set)(struct nv50_wndw *, struct nv50_wndw_atom *);
 	void (*xlut_clr)(struct nv50_wndw *);

drivers/gpu/drm/nouveau/dispnv50/wndwc37e.c

@@ -71,14 +71,18 @@ wndwc37e_ilut_set(struct nv50_wndw *wndw, struct nv50_wndw_atom *asyw)
 	}
 }
 
-static void
-wndwc37e_ilut(struct nv50_wndw *wndw, struct nv50_wndw_atom *asyw)
+static bool
+wndwc37e_ilut(struct nv50_wndw *wndw, struct nv50_wndw_atom *asyw, int size)
 {
+	if (size != 256 && size != 1024)
+		return false;
+
 	asyw->xlut.i.mode = 2;
-	asyw->xlut.i.size = 0;
+	asyw->xlut.i.size = size == 1024 ? 2 : 0;
 	asyw->xlut.i.range = 0;
 	asyw->xlut.i.output_mode = 1;
 	asyw->xlut.i.load = head907d_olut_load;
+	return true;
 }
 
 void
@@ -261,6 +265,7 @@ wndwc37e = {
 	.ntfy_reset = corec37d_ntfy_init,
 	.ntfy_wait_begun = base507c_ntfy_wait_begun,
 	.ilut = wndwc37e_ilut,
+	.ilut_size = 1024,
 	.xlut_set = wndwc37e_ilut_set,
 	.xlut_clr = wndwc37e_ilut_clr,
 	.csc = base907c_csc,

drivers/gpu/drm/nouveau/dispnv50/wndwc57e.c

@@ -156,19 +156,21 @@ wndwc57e_ilut_load(struct drm_color_lut *in, int size, void __iomem *mem)
 	writew(readw(mem - 4), mem + 4);
 }
 
-static void
-wndwc57e_ilut(struct nv50_wndw *wndw, struct nv50_wndw_atom *asyw)
+static bool
+wndwc57e_ilut(struct nv50_wndw *wndw, struct nv50_wndw_atom *asyw, int size)
 {
-	u16 size = asyw->ilut->length / sizeof(struct drm_color_lut);
+	if (size = size ? size : 1024, size != 256 && size != 1024)
+		return false;
+
 	if (size == 256) {
 		asyw->xlut.i.mode = 1; /* DIRECT8. */
 	} else {
 		asyw->xlut.i.mode = 2; /* DIRECT10. */
-		size = 1024;
 	}
 	asyw->xlut.i.size = 4 /* VSS header. */ + size + 1 /* Entries. */;
 	asyw->xlut.i.output_mode = 0; /* INTERPOLATE_DISABLE. */
 	asyw->xlut.i.load = wndwc57e_ilut_load;
+	return true;
 }
 
 static const struct nv50_wndw_func
@@ -183,6 +185,7 @@ wndwc57e = {
 	.ntfy_wait_begun = base507c_ntfy_wait_begun,
 	.ilut = wndwc57e_ilut,
 	.ilut_identity = true,
+	.ilut_size = 1024,
 	.xlut_set = wndwc57e_ilut_set,
 	.xlut_clr = wndwc57e_ilut_clr,
 	.csc = base907c_csc,