drm/nouveau/disp: add head class

v2: remove extra whitespace

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Reviewed-by: Lyude Paul <lyude@redhat.com>

drivers/gpu/drm/nouveau/dispnv04/crtc.c

@@ -762,6 +762,7 @@ static void nv_crtc_destroy(struct drm_crtc *crtc)
 	nouveau_bo_unpin(nv_crtc->cursor.nvbo);
 	nouveau_bo_ref(NULL, &nv_crtc->cursor.nvbo);
 	nvif_notify_dtor(&nv_crtc->vblank);
+	nvif_head_dtor(&nv_crtc->head);
 	kfree(nv_crtc);
 }
 
@@ -1341,6 +1342,10 @@ nv04_crtc_create(struct drm_device *dev, int crtc_num)
 
 	nv04_cursor_init(nv_crtc);
 
+	ret = nvif_head_ctor(&disp->disp, nv_crtc->base.name, nv_crtc->index, &nv_crtc->head);
+	if (ret)
+		return ret;
+
 	ret = nvif_notify_ctor(&disp->disp.object, "kmsVbl", nv04_crtc_vblank_handler,
 			       false, NV04_DISP_NTFY_VBLANK,
 			       &(struct nvif_notify_head_req_v0) {

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

@@ -518,6 +518,7 @@ nv50_head_destroy(struct drm_crtc *crtc)
 	struct nv50_head *head = nv50_head(crtc);
 
 	nvif_notify_dtor(&head->base.vblank);
+	nvif_head_dtor(&head->base.head);
 	nv50_lut_fini(&head->olut);
 	drm_crtc_cleanup(crtc);
 	kfree(head);
@@ -624,6 +625,10 @@ nv50_head_create(struct drm_device *dev, int index)
 		}
 	}
 
+	ret = nvif_head_ctor(disp->disp, head->base.base.name, head->base.index, &head->base.head);
+	if (ret)
+		return ERR_PTR(ret);
+
 	ret = nvif_notify_ctor(&disp->disp->object, "kmsVbl", nv50_head_vblank_handler,
 			       false, NV04_DISP_NTFY_VBLANK,
 			       &(struct nvif_notify_head_req_v0) {

drivers/gpu/drm/nouveau/include/nvif/class.h

@@ -35,6 +35,7 @@
 #define NVIF_CLASS_DISP                              /* if0010.h */  0x80000010
 #define NVIF_CLASS_CONN                              /* if0011.h */  0x80000011
 #define NVIF_CLASS_OUTP                              /* if0012.h */  0x80000012
+#define NVIF_CLASS_HEAD                              /* if0013.h */  0x80000013
 #define NVIF_CLASS_DISP_CHAN                         /* if0014.h */  0x80000014
 
 /* the below match nvidia-assigned (either in hw, or sw) class numbers */

drivers/gpu/drm/nouveau/include/nvif/disp.h

@@ -7,6 +7,7 @@ struct nvif_disp {
 	struct nvif_object object;
 	unsigned long conn_mask;
 	unsigned long outp_mask;
+	unsigned long head_mask;
 };
 
 int nvif_disp_ctor(struct nvif_device *, const char *name, s32 oclass,

drivers/gpu/drm/nouveau/include/nvif/head.h

@@ -0,0 +1,13 @@
+/* SPDX-License-Identifier: MIT */
+#ifndef __NVIF_HEAD_H__
+#define __NVIF_HEAD_H__
+#include <nvif/object.h>
+struct nvif_disp;
+
+struct nvif_head {
+	struct nvif_object object;
+};
+
+int nvif_head_ctor(struct nvif_disp *, const char *name, int id, struct nvif_head *);
+void nvif_head_dtor(struct nvif_head *);
+#endif

drivers/gpu/drm/nouveau/include/nvif/if0010.h

@@ -8,6 +8,7 @@ union nvif_disp_args {
 		__u8 pad01[3];
 		__u32 conn_mask;
 		__u32 outp_mask;
+		__u32 head_mask;
 	} v0;
 };
 #endif

drivers/gpu/drm/nouveau/include/nvif/if0013.h

@@ -0,0 +1,12 @@
+/* SPDX-License-Identifier: MIT */
+#ifndef __NVIF_IF0013_H__
+#define __NVIF_IF0013_H__
+
+union nvif_head_args {
+	struct nvif_head_v0 {
+		__u8 version;
+		__u8 id;
+		__u8 pad02[6];
+	} v0;
+};
+#endif

drivers/gpu/drm/nouveau/nouveau_crtc.h

@@ -26,14 +26,15 @@
 
 #ifndef __NOUVEAU_CRTC_H__
 #define __NOUVEAU_CRTC_H__
-
 #include <drm/drm_crtc.h>
 
+#include <nvif/head.h>
 #include <nvif/notify.h>
 
 struct nouveau_crtc {
 	struct drm_crtc base;
 
+	struct nvif_head head;
 	int index;
 	struct nvif_notify vblank;
 

drivers/gpu/drm/nouveau/nvif/Kbuild

@@ -6,6 +6,7 @@ nvif-y += nvif/device.o
 nvif-y += nvif/disp.o
 nvif-y += nvif/driver.o
 nvif-y += nvif/fifo.o
+nvif-y += nvif/head.o
 nvif-y += nvif/mem.o
 nvif-y += nvif/mmu.o
 nvif-y += nvif/notify.o

drivers/gpu/drm/nouveau/nvif/disp.c

@@ -72,9 +72,10 @@ nvif_disp_ctor(struct nvif_device *device, const char *name, s32 oclass, struct
 	if (ret)
 		return ret;
 
-	NVIF_DEBUG(&disp->object, "[NEW] conn_mask:%08x outp_mask:%08x",
-		   args.conn_mask, args.outp_mask);
+	NVIF_DEBUG(&disp->object, "[NEW] conn_mask:%08x outp_mask:%08x head_mask:%08x",
+		   args.conn_mask, args.outp_mask, args.head_mask);
 	disp->conn_mask = args.conn_mask;
 	disp->outp_mask = args.outp_mask;
+	disp->head_mask = args.head_mask;
 	return 0;
 }

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

@@ -0,0 +1,48 @@
+/*
+ * Copyright 2021 Red Hat Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ */
+#include <nvif/head.h>
+#include <nvif/disp.h>
+#include <nvif/printf.h>
+
+#include <nvif/class.h>
+#include <nvif/if0013.h>
+
+void
+nvif_head_dtor(struct nvif_head *head)
+{
+	nvif_object_dtor(&head->object);
+}
+
+int
+nvif_head_ctor(struct nvif_disp *disp, const char *name, int id, struct nvif_head *head)
+{
+	struct nvif_head_v0 args;
+	int ret;
+
+	args.version = 0;
+	args.id = id;
+
+	ret = nvif_object_ctor(&disp->object, name ? name : "nvifHead", id, NVIF_CLASS_HEAD,
+			       &args, sizeof(args), &head->object);
+	NVIF_ERRON(ret, &disp->object, "[NEW head id:%d]", args.id);
+	return ret;
+}

drivers/gpu/drm/nouveau/nvkm/engine/disp/Kbuild

@@ -34,3 +34,4 @@ nvkm-y += nvkm/engine/disp/rootnv50.o
 nvkm-y += nvkm/engine/disp/udisp.o
 nvkm-y += nvkm/engine/disp/uconn.o
 nvkm-y += nvkm/engine/disp/uoutp.o
+nvkm-y += nvkm/engine/disp/uhead.o

drivers/gpu/drm/nouveau/nvkm/engine/disp/head.h

@@ -1,6 +1,7 @@
 /* SPDX-License-Identifier: MIT */
 #ifndef __NVKM_DISP_HEAD_H__
 #define __NVKM_DISP_HEAD_H__
+#include <nvif/object.h>
 #include "priv.h"
 
 struct nvkm_head {
@@ -26,6 +27,8 @@ struct nvkm_head {
 			u8 depth;
 		} or;
 	} arm, asy;
+
+	struct nvkm_object object;
 };
 
 int nvkm_head_new_(const struct nvkm_head_func *, struct nvkm_disp *, int id);

drivers/gpu/drm/nouveau/nvkm/engine/disp/priv.h

@@ -86,4 +86,5 @@ extern const struct nvkm_event_func gv100_disp_chan_uevent;
 int nvkm_udisp_new(const struct nvkm_oclass *, void *, u32, struct nvkm_object **);
 int nvkm_uconn_new(const struct nvkm_oclass *, void *, u32, struct nvkm_object **);
 int nvkm_uoutp_new(const struct nvkm_oclass *, void *, u32, struct nvkm_object **);
+int nvkm_uhead_new(const struct nvkm_oclass *, void *, u32, struct nvkm_object **);
 #endif

drivers/gpu/drm/nouveau/nvkm/engine/disp/udisp.c

@@ -21,6 +21,7 @@
  */
 #include "priv.h"
 #include "conn.h"
+#include "head.h"
 #include "outp.h"
 
 #include <nvif/class.h>
@@ -43,6 +44,12 @@ nvkm_udisp_sclass(struct nvkm_object *object, int index, struct nvkm_oclass *scl
 		return 0;
 	}
 
+	if (index-- == 0) {
+		sclass->base = (struct nvkm_sclass) { 0, 0, NVIF_CLASS_HEAD };
+		sclass->ctor = nvkm_uhead_new;
+		return 0;
+	}
+
 	if (disp->func->user[index].ctor) {
 		sclass->base = disp->func->user[index].base;
 		sclass->ctor = disp->func->user[index].ctor;
@@ -89,6 +96,7 @@ nvkm_udisp_new(const struct nvkm_oclass *oclass, void *argv, u32 argc, struct nv
 	struct nvkm_disp *disp = nvkm_disp(oclass->engine);
 	struct nvkm_conn *conn;
 	struct nvkm_outp *outp;
+	struct nvkm_head *head;
 	union nvif_disp_args *args = argv;
 
 	if (argc != sizeof(args->v0) || args->v0.version != 0)
@@ -111,5 +119,9 @@ nvkm_udisp_new(const struct nvkm_oclass *oclass, void *argv, u32 argc, struct nv
 	list_for_each_entry(outp, &disp->outps, head)
 		args->v0.outp_mask |= BIT(outp->index);
 
+	args->v0.head_mask = 0;
+	list_for_each_entry(head, &disp->heads, head)
+		args->v0.head_mask |= BIT(head->id);
+
 	return 0;
 }

drivers/gpu/drm/nouveau/nvkm/engine/disp/uhead.c

@@ -0,0 +1,66 @@
+/*
+ * Copyright 2021 Red Hat Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ */
+#define nvkm_uhead(p) container_of((p), struct nvkm_head, object)
+#include "head.h"
+
+#include <nvif/if0013.h>
+
+static void *
+nvkm_uhead_dtor(struct nvkm_object *object)
+{
+	struct nvkm_head *head = nvkm_uhead(object);
+	struct nvkm_disp *disp = head->disp;
+
+	spin_lock(&disp->client.lock);
+	head->object.func = NULL;
+	spin_unlock(&disp->client.lock);
+	return NULL;
+}
+
+static const struct nvkm_object_func
+nvkm_uhead = {
+	.dtor = nvkm_uhead_dtor,
+};
+
+int
+nvkm_uhead_new(const struct nvkm_oclass *oclass, void *argv, u32 argc, struct nvkm_object **pobject)
+{
+	struct nvkm_disp *disp = nvkm_udisp(oclass->parent);
+	struct nvkm_head *head;
+	union nvif_head_args *args = argv;
+	int ret;
+
+	if (argc != sizeof(args->v0) || args->v0.version != 0)
+		return -ENOSYS;
+	if (!(head = nvkm_head_find(disp, args->v0.id)))
+		return -EINVAL;
+
+	ret = -EBUSY;
+	spin_lock(&disp->client.lock);
+	if (!head->object.func) {
+		nvkm_object_ctor(&nvkm_uhead, oclass, &head->object);
+		*pobject = &head->object;
+		ret = 0;
+	}
+	spin_unlock(&disp->client.lock);
+	return ret;
+}