drm/nouveau/fifo/tu102-: prepare for GSP-RM

- (temporarily) disable if GSP-RM detected, will be added later
- add dtor() so GSP-RM paths can cleanup properly
- add alternate engine context mapping interface for RM engines
- add alternate chid interfaces to handle RM USERD oddities

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230918202149.4343-26-skeggsb@gmail.com

Author: Ben Skeggs

drivers/gpu/drm/nouveau/include/nvkm/engine/fifo.h

@@ -66,6 +66,9 @@ struct nvkm_fifo {
 	struct {
 		struct nvkm_memory *mem;
 		struct nvkm_vma *bar1;
+
+		struct mutex mutex;
+		struct list_head list;
 	} userd;
 
 	spinlock_t lock;

drivers/gpu/drm/nouveau/nvkm/engine/fifo/base.c

@@ -347,8 +347,14 @@ nvkm_fifo_dtor(struct nvkm_engine *engine)
 	nvkm_chid_unref(&fifo->cgid);
 	nvkm_chid_unref(&fifo->chid);
 
+	mutex_destroy(&fifo->userd.mutex);
+
 	nvkm_event_fini(&fifo->nonstall.event);
 	mutex_destroy(&fifo->mutex);
+
+	if (fifo->func->dtor)
+		fifo->func->dtor(fifo);
+
 	return fifo;
 }
 
@@ -383,5 +389,8 @@ nvkm_fifo_new_(const struct nvkm_fifo_func *func, struct nvkm_device *device,
 	spin_lock_init(&fifo->lock);
 	mutex_init(&fifo->mutex);
 
+	INIT_LIST_HEAD(&fifo->userd.list);
+	mutex_init(&fifo->userd.mutex);
+
 	return nvkm_engine_ctor(&nvkm_fifo, device, type, inst, true, &fifo->engine);
 }

drivers/gpu/drm/nouveau/nvkm/engine/fifo/cgrp.c

@@ -156,6 +156,9 @@ nvkm_cgrp_vctx_get(struct nvkm_cgrp *cgrp, struct nvkm_engn *engn, struct nvkm_c
 		atomic_inc(&vctx->vmm->engref[engn->engine->subdev.type]);
 
 	/* Allocate the HW structures. */
+	if (engn->func->ctor2) {
+		ret = engn->func->ctor2(engn, vctx, chan);
+	} else
 	if (engn->func->bind) {
 		ret = nvkm_object_bind(vctx->ectx->object, NULL, 0, &vctx->inst);
 		if (ret == 0 && engn->func->ctor)

drivers/gpu/drm/nouveau/nvkm/engine/fifo/chan.c

@@ -275,13 +275,17 @@ nvkm_chan_del(struct nvkm_chan **pchan)
 	nvkm_gpuobj_del(&chan->cache);
 	nvkm_gpuobj_del(&chan->ramfc);
 
-	nvkm_memory_unref(&chan->userd.mem);
-
 	if (chan->cgrp) {
-		nvkm_chid_put(chan->cgrp->runl->chid, chan->id, &chan->cgrp->lock);
+		if (!chan->func->id_put)
+			nvkm_chid_put(chan->cgrp->runl->chid, chan->id, &chan->cgrp->lock);
+		else
+			chan->func->id_put(chan);
+
 		nvkm_cgrp_unref(&chan->cgrp);
 	}
 
+	nvkm_memory_unref(&chan->userd.mem);
+
 	if (chan->vmm) {
 		nvkm_vmm_part(chan->vmm, chan->inst->memory);
 		nvkm_vmm_unref(&chan->vmm);
@@ -438,7 +442,32 @@ nvkm_chan_new_(const struct nvkm_chan_func *func, struct nvkm_runl *runl, int ru
 	}
 
 	/* Allocate channel ID. */
-	chan->id = nvkm_chid_get(runl->chid, chan);
+	if (!chan->func->id_get) {
+		chan->id = nvkm_chid_get(runl->chid, chan);
+		if (chan->id >= 0) {
+			if (func->userd->bar < 0) {
+				if (ouserd + chan->func->userd->size >=
+					nvkm_memory_size(userd)) {
+					RUNL_DEBUG(runl, "ouserd %llx", ouserd);
+					return -EINVAL;
+				}
+
+				ret = nvkm_memory_kmap(userd, &chan->userd.mem);
+				if (ret) {
+					RUNL_DEBUG(runl, "userd %d", ret);
+					return ret;
+				}
+
+				chan->userd.base = ouserd;
+			} else {
+				chan->userd.mem = nvkm_memory_ref(fifo->userd.mem);
+				chan->userd.base = chan->id * chan->func->userd->size;
+			}
+		}
+	} else {
+		chan->id = chan->func->id_get(chan, userd, ouserd);
+	}
+
 	if (chan->id < 0) {
 		RUNL_ERROR(runl, "!chids");
 		return -ENOSPC;
@@ -448,24 +477,6 @@ nvkm_chan_new_(const struct nvkm_chan_func *func, struct nvkm_runl *runl, int ru
 		cgrp->id = chan->id;
 
 	/* Initialise USERD. */
-	if (func->userd->bar < 0) {
-		if (ouserd + chan->func->userd->size >= nvkm_memory_size(userd)) {
-			RUNL_DEBUG(runl, "ouserd %llx", ouserd);
-			return -EINVAL;
-		}
-
-		ret = nvkm_memory_kmap(userd, &chan->userd.mem);
-		if (ret) {
-			RUNL_DEBUG(runl, "userd %d", ret);
-			return ret;
-		}
-
-		chan->userd.base = ouserd;
-	} else {
-		chan->userd.mem = nvkm_memory_ref(fifo->userd.mem);
-		chan->userd.base = chan->id * chan->func->userd->size;
-	}
-
 	if (chan->func->userd->clear)
 		chan->func->userd->clear(chan);
 

drivers/gpu/drm/nouveau/nvkm/engine/fifo/chan.h

@@ -17,6 +17,9 @@ struct nvkm_cctx {
 };
 
 struct nvkm_chan_func {
+	int (*id_get)(struct nvkm_chan *, struct nvkm_memory *userd, u64 ouserd);
+	void (*id_put)(struct nvkm_chan *);
+
 	const struct nvkm_chan_func_inst {
 		u32 size;
 		bool zero;

drivers/gpu/drm/nouveau/nvkm/engine/fifo/ga100.c

@@ -27,6 +27,7 @@
 #include "runq.h"
 
 #include <core/gpuobj.h>
+#include <subdev/gsp.h>
 #include <subdev/top.h>
 #include <subdev/vfn.h>
 
@@ -607,5 +608,8 @@ int
 ga100_fifo_new(struct nvkm_device *device, enum nvkm_subdev_type type, int inst,
 	       struct nvkm_fifo **pfifo)
 {
+	if (nvkm_gsp_rm(device->gsp))
+		return -ENODEV;
+
 	return nvkm_fifo_new_(&ga100_fifo, device, type, inst, pfifo);
 }

drivers/gpu/drm/nouveau/nvkm/engine/fifo/ga102.c

@@ -21,6 +21,8 @@
  */
 #include "priv.h"
 
+#include <subdev/gsp.h>
+
 #include <nvif/class.h>
 
 static const struct nvkm_fifo_func
@@ -41,5 +43,8 @@ int
 ga102_fifo_new(struct nvkm_device *device, enum nvkm_subdev_type type, int inst,
 	       struct nvkm_fifo **pfifo)
 {
+	if (nvkm_gsp_rm(device->gsp))
+		return -ENODEV;
+
 	return nvkm_fifo_new_(&ga102_fifo, device, type, inst, pfifo);
 }

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

@@ -13,6 +13,8 @@ struct nvkm_runq;
 struct nvkm_vctx;
 
 struct nvkm_fifo_func {
+	void (*dtor)(struct nvkm_fifo *);
+
 	int (*chid_nr)(struct nvkm_fifo *);
 	int (*chid_ctor)(struct nvkm_fifo *, int nr);
 	int (*runq_nr)(struct nvkm_fifo *);

drivers/gpu/drm/nouveau/nvkm/engine/fifo/runl.h

@@ -18,6 +18,7 @@ struct nvkm_engn {
 		bool (*mmu_fault_triggered)(struct nvkm_engn *);
 		int (*ctor)(struct nvkm_engn *, struct nvkm_vctx *);
 		void (*bind)(struct nvkm_engn *, struct nvkm_cctx *, struct nvkm_chan *);
+		int (*ctor2)(struct nvkm_engn *, struct nvkm_vctx *, struct nvkm_chan *);
 		int (*ramht_add)(struct nvkm_engn *, struct nvkm_object *, struct nvkm_chan *);
 		void (*ramht_del)(struct nvkm_chan *, int hash);
 	} *func;

drivers/gpu/drm/nouveau/nvkm/engine/fifo/tu102.c

@@ -25,6 +25,7 @@
 #include "runl.h"
 
 #include <core/memory.h>
+#include <subdev/gsp.h>
 #include <subdev/mc.h>
 #include <subdev/vfn.h>
 
@@ -282,5 +283,8 @@ int
 tu102_fifo_new(struct nvkm_device *device, enum nvkm_subdev_type type, int inst,
 	       struct nvkm_fifo **pfifo)
 {
+	if (nvkm_gsp_rm(device->gsp))
+		return -ENODEV;
+
 	return nvkm_fifo_new_(&tu102_fifo, device, type, inst, pfifo);
 }