drm/nouveau/fifo: add RAMFC info to nvkm_chan_func

- adds support for specifying SUBDEVICE_ID for channel
- rounds non-power-of-two GPFIFO sizes down, rather than up

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

29 files changed, 488 insertions, 321 deletions

diff --git a/drivers/gpu/drm/nouveau/include/nvkm/engine/fifo.h b/drivers/gpu/drm/nouveau/include/nvkm/engine/fifo.h
index 95cb33b53228..1616a329db9e 100644
--- a/drivers/gpu/drm/nouveau/include/nvkm/engine/fifo.h
+++ b/drivers/gpu/drm/nouveau/include/nvkm/engine/fifo.h
@@ -28,6 +28,13 @@ struct nvkm_chan {
 		u32 base;
 	} userd;
 
+	u32 ramfc_offset;
+	struct nvkm_gpuobj *ramfc;
+	struct nvkm_gpuobj *cache;
+	struct nvkm_gpuobj *eng;
+	struct nvkm_gpuobj *pgd;
+	struct nvkm_ramht *ramht;
+
 	spinlock_t lock;
 	atomic_t blocked;
 	atomic_t errored;
diff --git a/drivers/gpu/drm/nouveau/nvkm/engine/fifo/chan.c b/drivers/gpu/drm/nouveau/nvkm/engine/fifo/chan.c
index 0df089b692a9..00680b3ca9ab 100644
--- a/drivers/gpu/drm/nouveau/nvkm/engine/fifo/chan.c
+++ b/drivers/gpu/drm/nouveau/nvkm/engine/fifo/chan.c
@@ -29,8 +29,8 @@
 #include "priv.h"
 
 #include <core/client.h>
-#include <core/gpuobj.h>
 #include <core/oproxy.h>
+#include <core/ramht.h>
 #include <subdev/mmu.h>
 #include <engine/dma.h>
 
@@ -434,6 +434,15 @@ nvkm_chan_del(struct nvkm_chan **pchan)
 	if (!chan)
 		return;
 
+	if (chan->func->ramfc->clear)
+		chan->func->ramfc->clear(chan);
+
+	nvkm_ramht_del(&chan->ramht);
+	nvkm_gpuobj_del(&chan->pgd);
+	nvkm_gpuobj_del(&chan->eng);
+	nvkm_gpuobj_del(&chan->cache);
+	nvkm_gpuobj_del(&chan->ramfc);
+
 	nvkm_memory_unref(&chan->userd.mem);
 
 	if (chan->cgrp) {
@@ -618,16 +627,17 @@ nvkm_fifo_chan_ctor(const struct nvkm_fifo_chan_func *fn,
 		chan->vmm = nvkm_vmm_ref(vmm);
 	}
 
-	/* allocate push buffer ctxdma instance */
-	if (push) {
+	/* Allocate HW ctxdma for push buffer. */
+	if (func->ramfc->ctxdma) {
 		dmaobj = nvkm_dmaobj_search(client, push);
 		if (IS_ERR(dmaobj))
 			return PTR_ERR(dmaobj);
 
-		ret = nvkm_object_bind(&dmaobj->object, chan->inst, -16,
-				       &chan->push);
-		if (ret)
+		ret = nvkm_object_bind(&dmaobj->object, chan->inst, -16, &chan->push);
+		if (ret) {
+			RUNL_DEBUG(runl, "bind %d", ret);
 			return ret;
+		}
 	}
 
 	/* Allocate channel ID. */
diff --git a/drivers/gpu/drm/nouveau/nvkm/engine/fifo/chan.h b/drivers/gpu/drm/nouveau/nvkm/engine/fifo/chan.h
index 54ef137bdfac..6e41eba0a7e2 100644
--- a/drivers/gpu/drm/nouveau/nvkm/engine/fifo/chan.h
+++ b/drivers/gpu/drm/nouveau/nvkm/engine/fifo/chan.h
@@ -29,6 +29,21 @@ struct nvkm_chan_func {
 		void (*clear)(struct nvkm_chan *);
 	} *userd;
 
+	const struct nvkm_chan_func_ramfc {
+		const struct nvkm_ramfc_layout {
+			unsigned bits:6;
+			unsigned ctxs:5;
+			unsigned ctxp:8;
+			unsigned regs:5;
+			unsigned regp;
+		} *layout;
+		int (*write)(struct nvkm_chan *, u64 offset, u64 length, u32 devm, bool priv);
+		void (*clear)(struct nvkm_chan *);
+		bool ctxdma;
+		u32 devm;
+		bool priv;
+	} *ramfc;
+
 	void (*bind)(struct nvkm_chan *);
 	void (*unbind)(struct nvkm_chan *);
 	void (*start)(struct nvkm_chan *);
diff --git a/drivers/gpu/drm/nouveau/nvkm/engine/fifo/chang84.c b/drivers/gpu/drm/nouveau/nvkm/engine/fifo/chang84.c
index 64566b5cc23f..f5e3557b9e50 100644
--- a/drivers/gpu/drm/nouveau/nvkm/engine/fifo/chang84.c
+++ b/drivers/gpu/drm/nouveau/nvkm/engine/fifo/chang84.c
@@ -182,7 +182,6 @@ g84_fifo_chan_ctor(struct nv50_fifo *fifo, u64 vmm, u64 push,
 		   const struct nvkm_oclass *oclass,
 		   struct nv50_fifo_chan *chan)
 {
-	struct nvkm_device *device = fifo->base.engine.subdev.device;
 	int ret;
 
 	if (!vmm)
@@ -206,28 +205,5 @@ g84_fifo_chan_ctor(struct nv50_fifo *fifo, u64 vmm, u64 push,
 				  BIT(G84_FIFO_ENGN_DMA),
 				  0, 0xc00000, 0x2000, oclass, &chan->base);
 	chan->fifo = fifo;
-	if (ret)
-		return ret;
-
-	ret = nvkm_gpuobj_new(device, 0x0200, 0, true, chan->base.inst,
-			      &chan->eng);
-	if (ret)
-		return ret;
-
-	ret = nvkm_gpuobj_new(device, 0x4000, 0, false, chan->base.inst,
-			      &chan->pgd);
-	if (ret)
-		return ret;
-
-	ret = nvkm_gpuobj_new(device, 0x1000, 0x400, true, chan->base.inst,
-			      &chan->cache);
-	if (ret)
-		return ret;
-
-	ret = nvkm_gpuobj_new(device, 0x100, 0x100, true, chan->base.inst,
-			      &chan->ramfc);
-	if (ret)
-		return ret;
-
-	return nvkm_ramht_new(device, 0x8000, 16, chan->base.inst, &chan->ramht);
+	return ret;
 }
diff --git a/drivers/gpu/drm/nouveau/nvkm/engine/fifo/channv50.c b/drivers/gpu/drm/nouveau/nvkm/engine/fifo/channv50.c
index 5d6f82236c50..0bf59c4e92b9 100644
--- a/drivers/gpu/drm/nouveau/nvkm/engine/fifo/channv50.c
+++ b/drivers/gpu/drm/nouveau/nvkm/engine/fifo/channv50.c
@@ -187,11 +187,6 @@ void *
 nv50_fifo_chan_dtor(struct nvkm_fifo_chan *base)
 {
 	struct nv50_fifo_chan *chan = nv50_fifo_chan(base);
-	nvkm_ramht_del(&chan->ramht);
-	nvkm_gpuobj_del(&chan->pgd);
-	nvkm_gpuobj_del(&chan->eng);
-	nvkm_gpuobj_del(&chan->cache);
-	nvkm_gpuobj_del(&chan->ramfc);
 	return chan;
 }
 
@@ -211,7 +206,6 @@ nv50_fifo_chan_ctor(struct nv50_fifo *fifo, u64 vmm, u64 push,
 		    const struct nvkm_oclass *oclass,
 		    struct nv50_fifo_chan *chan)
 {
-	struct nvkm_device *device = fifo->base.engine.subdev.device;
 	int ret;
 
 	if (!vmm)
@@ -225,23 +219,5 @@ nv50_fifo_chan_ctor(struct nv50_fifo *fifo, u64 vmm, u64 push,
 				  BIT(NV50_FIFO_ENGN_DMA),
 				  0, 0xc00000, 0x2000, oclass, &chan->base);
 	chan->fifo = fifo;
-	if (ret)
-		return ret;
-
-	ret = nvkm_gpuobj_new(device, 0x0200, 0x1000, true, chan->base.inst,
-			      &chan->ramfc);
-	if (ret)
-		return ret;
-
-	ret = nvkm_gpuobj_new(device, 0x1200, 0, true, chan->base.inst,
-			      &chan->eng);
-	if (ret)
-		return ret;
-
-	ret = nvkm_gpuobj_new(device, 0x4000, 0, false, chan->base.inst,
-			      &chan->pgd);
-	if (ret)
-		return ret;
-
-	return nvkm_ramht_new(device, 0x8000, 16, chan->base.inst, &chan->ramht);
+	return ret;
 }
diff --git a/drivers/gpu/drm/nouveau/nvkm/engine/fifo/channv50.h b/drivers/gpu/drm/nouveau/nvkm/engine/fifo/channv50.h
index ce7d61e8d297..343356a0e5ef 100644
--- a/drivers/gpu/drm/nouveau/nvkm/engine/fifo/channv50.h
+++ b/drivers/gpu/drm/nouveau/nvkm/engine/fifo/channv50.h
@@ -9,10 +9,7 @@ struct nv50_fifo_chan {
 	struct nv50_fifo *fifo;
 	struct nvkm_fifo_chan base;
 
-	struct nvkm_gpuobj *ramfc;
-	struct nvkm_gpuobj *cache;
 	struct nvkm_gpuobj *eng;
-	struct nvkm_gpuobj *pgd;
 	struct nvkm_ramht *ramht;
 
 #define NV50_FIFO_ENGN_SW   0
diff --git a/drivers/gpu/drm/nouveau/nvkm/engine/fifo/dmanv04.c b/drivers/gpu/drm/nouveau/nvkm/engine/fifo/dmanv04.c
index d515cf08fc3b..4220120d8bb8 100644
--- a/drivers/gpu/drm/nouveau/nvkm/engine/fifo/dmanv04.c
+++ b/drivers/gpu/drm/nouveau/nvkm/engine/fifo/dmanv04.c
@@ -73,15 +73,6 @@ void *
 nv04_fifo_dma_dtor(struct nvkm_fifo_chan *base)
 {
 	struct nv04_fifo_chan *chan = nv04_fifo_chan(base);
-	struct nv04_fifo *fifo = chan->fifo;
-	struct nvkm_instmem *imem = fifo->base.engine.subdev.device->imem;
-	const struct nv04_fifo_ramfc *c = fifo->ramfc;
-
-	nvkm_kmap(imem->ramfc);
-	do {
-		nvkm_wo32(imem->ramfc, chan->ramfc + c->ctxp, 0x00000000);
-	} while ((++c)->bits);
-	nvkm_done(imem->ramfc);
 	return chan;
 }
 
@@ -102,8 +93,6 @@ nv04_fifo_dma_new(struct nvkm_fifo *base, const struct nvkm_oclass *oclass,
 	} *args = data;
 	struct nv04_fifo *fifo = nv04_fifo(base);
 	struct nv04_fifo_chan *chan = NULL;
-	struct nvkm_device *device = fifo->base.engine.subdev.device;
-	struct nvkm_instmem *imem = device->imem;
 	int ret = -ENOSYS;
 
 	nvif_ioctl(parent, "create channel dma size %d\n", size);
@@ -131,20 +120,8 @@ nv04_fifo_dma_new(struct nvkm_fifo *base, const struct nvkm_oclass *oclass,
 		return ret;
 
 	args->v0.chid = chan->base.chid;
-	chan->ramfc = chan->base.chid * 32;
-
-	nvkm_kmap(imem->ramfc);
-	nvkm_wo32(imem->ramfc, chan->ramfc + 0x00, args->v0.offset);
-	nvkm_wo32(imem->ramfc, chan->ramfc + 0x04, args->v0.offset);
-	nvkm_wo32(imem->ramfc, chan->ramfc + 0x08, chan->base.push->addr >> 4);
-	nvkm_wo32(imem->ramfc, chan->ramfc + 0x10,
-			       NV_PFIFO_CACHE1_DMA_FETCH_TRIG_128_BYTES |
-			       NV_PFIFO_CACHE1_DMA_FETCH_SIZE_128_BYTES |
-#ifdef __BIG_ENDIAN
-			       NV_PFIFO_CACHE1_BIG_ENDIAN |
-#endif
-			       NV_PFIFO_CACHE1_DMA_FETCH_MAX_REQS_8);
-	nvkm_done(imem->ramfc);
+
+	chan->base.func->ramfc->write(&chan->base, args->v0.offset, 0, BIT(0), false);
 	return 0;
 }
 
diff --git a/drivers/gpu/drm/nouveau/nvkm/engine/fifo/dmanv10.c b/drivers/gpu/drm/nouveau/nvkm/engine/fifo/dmanv10.c
index f45655072f9d..aa5893c11203 100644
--- a/drivers/gpu/drm/nouveau/nvkm/engine/fifo/dmanv10.c
+++ b/drivers/gpu/drm/nouveau/nvkm/engine/fifo/dmanv10.c
@@ -41,8 +41,6 @@ nv10_fifo_dma_new(struct nvkm_fifo *base, const struct nvkm_oclass *oclass,
 	} *args = data;
 	struct nv04_fifo *fifo = nv04_fifo(base);
 	struct nv04_fifo_chan *chan = NULL;
-	struct nvkm_device *device = fifo->base.engine.subdev.device;
-	struct nvkm_instmem *imem = device->imem;
 	int ret = -ENOSYS;
 
 	nvif_ioctl(parent, "create channel dma size %d\n", size);
@@ -70,20 +68,8 @@ nv10_fifo_dma_new(struct nvkm_fifo *base, const struct nvkm_oclass *oclass,
 		return ret;
 
 	args->v0.chid = chan->base.chid;
-	chan->ramfc = chan->base.chid * 32;
 
-	nvkm_kmap(imem->ramfc);
-	nvkm_wo32(imem->ramfc, chan->ramfc + 0x00, args->v0.offset);
-	nvkm_wo32(imem->ramfc, chan->ramfc + 0x04, args->v0.offset);
-	nvkm_wo32(imem->ramfc, chan->ramfc + 0x0c, chan->base.push->addr >> 4);
-	nvkm_wo32(imem->ramfc, chan->ramfc + 0x14,
-			       NV_PFIFO_CACHE1_DMA_FETCH_TRIG_128_BYTES |
-			       NV_PFIFO_CACHE1_DMA_FETCH_SIZE_128_BYTES |
-#ifdef __BIG_ENDIAN
-			       NV_PFIFO_CACHE1_BIG_ENDIAN |
-#endif
-			       NV_PFIFO_CACHE1_DMA_FETCH_MAX_REQS_8);
-	nvkm_done(imem->ramfc);
+	chan->base.func->ramfc->write(&chan->base, args->v0.offset, 0, BIT(0), false);
 	return 0;
 }
 
diff --git a/drivers/gpu/drm/nouveau/nvkm/engine/fifo/dmanv17.c b/drivers/gpu/drm/nouveau/nvkm/engine/fifo/dmanv17.c
index cd3f9f84ab9c..0a7d145ce5aa 100644
--- a/drivers/gpu/drm/nouveau/nvkm/engine/fifo/dmanv17.c
+++ b/drivers/gpu/drm/nouveau/nvkm/engine/fifo/dmanv17.c
@@ -41,8 +41,6 @@ nv17_fifo_dma_new(struct nvkm_fifo *base, const struct nvkm_oclass *oclass,
 	} *args = data;
 	struct nv04_fifo *fifo = nv04_fifo(base);
 	struct nv04_fifo_chan *chan = NULL;
-	struct nvkm_device *device = fifo->base.engine.subdev.device;
-	struct nvkm_instmem *imem = device->imem;
 	int ret = -ENOSYS;
 
 	nvif_ioctl(parent, "create channel dma size %d\n", size);
@@ -71,20 +69,8 @@ nv17_fifo_dma_new(struct nvkm_fifo *base, const struct nvkm_oclass *oclass,
 		return ret;
 
 	args->v0.chid = chan->base.chid;
-	chan->ramfc = chan->base.chid * 64;
 
-	nvkm_kmap(imem->ramfc);
-	nvkm_wo32(imem->ramfc, chan->ramfc + 0x00, args->v0.offset);
-	nvkm_wo32(imem->ramfc, chan->ramfc + 0x04, args->v0.offset);
-	nvkm_wo32(imem->ramfc, chan->ramfc + 0x0c, chan->base.push->addr >> 4);
-	nvkm_wo32(imem->ramfc, chan->ramfc + 0x14,
-			       NV_PFIFO_CACHE1_DMA_FETCH_TRIG_128_BYTES |
-			       NV_PFIFO_CACHE1_DMA_FETCH_SIZE_128_BYTES |
-#ifdef __BIG_ENDIAN
-			       NV_PFIFO_CACHE1_BIG_ENDIAN |
-#endif
-			       NV_PFIFO_CACHE1_DMA_FETCH_MAX_REQS_8);
-	nvkm_done(imem->ramfc);
+	chan->base.func->ramfc->write(&chan->base, args->v0.offset, 0, BIT(0), false);
 	return 0;
 }
 
diff --git a/drivers/gpu/drm/nouveau/nvkm/engine/fifo/dmanv40.c b/drivers/gpu/drm/nouveau/nvkm/engine/fifo/dmanv40.c
index 2f0dceaf3b01..5e7104457a02 100644
--- a/drivers/gpu/drm/nouveau/nvkm/engine/fifo/dmanv40.c
+++ b/drivers/gpu/drm/nouveau/nvkm/engine/fifo/dmanv40.c
@@ -194,8 +194,6 @@ nv40_fifo_dma_new(struct nvkm_fifo *base, const struct nvkm_oclass *oclass,
 	} *args = data;
 	struct nv04_fifo *fifo = nv04_fifo(base);
 	struct nv04_fifo_chan *chan = NULL;
-	struct nvkm_device *device = fifo->base.engine.subdev.device;
-	struct nvkm_instmem *imem = device->imem;
 	int ret = -ENOSYS;
 
 	nvif_ioctl(parent, "create channel dma size %d\n", size);
@@ -224,21 +222,8 @@ nv40_fifo_dma_new(struct nvkm_fifo *base, const struct nvkm_oclass *oclass,
 		return ret;
 
 	args->v0.chid = chan->base.chid;
-	chan->ramfc = chan->base.chid * 128;
 
-	nvkm_kmap(imem->ramfc);
-	nvkm_wo32(imem->ramfc, chan->ramfc + 0x00, args->v0.offset);
-	nvkm_wo32(imem->ramfc, chan->ramfc + 0x04, args->v0.offset);
-	nvkm_wo32(imem->ramfc, chan->ramfc + 0x0c, chan->base.push->addr >> 4);
-	nvkm_wo32(imem->ramfc, chan->ramfc + 0x18, 0x30000000 |
-			       NV_PFIFO_CACHE1_DMA_FETCH_TRIG_128_BYTES |
-			       NV_PFIFO_CACHE1_DMA_FETCH_SIZE_128_BYTES |
-#ifdef __BIG_ENDIAN
-			       NV_PFIFO_CACHE1_BIG_ENDIAN |
-#endif
-			       NV_PFIFO_CACHE1_DMA_FETCH_MAX_REQS_8);
-	nvkm_wo32(imem->ramfc, chan->ramfc + 0x3c, 0x0001ffff);
-	nvkm_done(imem->ramfc);
+	chan->base.func->ramfc->write(&chan->base, args->v0.offset, 0, BIT(0), false);
 	return 0;
 }
 
diff --git a/drivers/gpu/drm/nouveau/nvkm/engine/fifo/g84.c b/drivers/gpu/drm/nouveau/nvkm/engine/fifo/g84.c
index 76ba98b4d3bf..6f3f5caaa748 100644
--- a/drivers/gpu/drm/nouveau/nvkm/engine/fifo/g84.c
+++ b/drivers/gpu/drm/nouveau/nvkm/engine/fifo/g84.c
@@ -25,7 +25,7 @@
 #include "chan.h"
 #include "runl.h"
 
-#include <core/gpuobj.h>
+#include <core/ramht.h>
 
 #include "nv50.h"
 #include "channv50.h"
@@ -37,13 +37,69 @@ g84_chan_bind(struct nvkm_chan *chan)
 {
 	struct nvkm_device *device = chan->cgrp->runl->fifo->engine.subdev.device;
 
-	nvkm_wr32(device, 0x002600 + (chan->id * 4), nv50_fifo_chan(chan)->ramfc->addr >> 8);
+	nvkm_wr32(device, 0x002600 + (chan->id * 4), chan->ramfc->addr >> 8);
 }
 
+static int
+g84_chan_ramfc_write(struct nvkm_chan *chan, u64 offset, u64 length, u32 devm, bool priv)
+{
+	struct nvkm_device *device = chan->cgrp->runl->fifo->engine.subdev.device;
+	const u32 limit2 = ilog2(length / 8);
+	int ret;
+
+	ret = nvkm_gpuobj_new(device, 0x0200, 0, true, chan->inst, &chan->eng);
+	if (ret)
+		return ret;
+
+	ret = nvkm_gpuobj_new(device, 0x4000, 0, false, chan->inst, &chan->pgd);
+	if (ret)
+		return ret;
+
+	ret = nvkm_gpuobj_new(device, 0x1000, 0x400, true, chan->inst, &chan->cache);
+	if (ret)
+		return ret;
+
+	ret = nvkm_gpuobj_new(device, 0x100, 0x100, true, chan->inst, &chan->ramfc);
+	if (ret)
+		return ret;
+
+	ret = nvkm_ramht_new(device, 0x8000, 16, chan->inst, &chan->ramht);
+	if (ret)
+		return ret;
+
+	nv50_fifo_chan(chan)->eng = chan->eng;
+	nv50_fifo_chan(chan)->ramht = chan->ramht;
+
+	nvkm_kmap(chan->ramfc);
+	nvkm_wo32(chan->ramfc, 0x3c, 0x403f6078);
+	nvkm_wo32(chan->ramfc, 0x44, 0x01003fff);
+	nvkm_wo32(chan->ramfc, 0x48, chan->push->node->offset >> 4);
+	nvkm_wo32(chan->ramfc, 0x50, lower_32_bits(offset));
+	nvkm_wo32(chan->ramfc, 0x54, upper_32_bits(offset) | (limit2 << 16));
+	nvkm_wo32(chan->ramfc, 0x60, 0x7fffffff);
+	nvkm_wo32(chan->ramfc, 0x78, 0x00000000);
+	nvkm_wo32(chan->ramfc, 0x7c, 0x30000000 | devm);
+	nvkm_wo32(chan->ramfc, 0x80, ((chan->ramht->bits - 9) << 27) |
+				     (4 << 24) /* SEARCH_FULL */ |
+				     (chan->ramht->gpuobj->node->offset >> 4));
+	nvkm_wo32(chan->ramfc, 0x88, chan->cache->addr >> 10);
+	nvkm_wo32(chan->ramfc, 0x98, chan->inst->addr >> 12);
+	nvkm_done(chan->ramfc);
+	return 0;
+}
+
+static const struct nvkm_chan_func_ramfc
+g84_chan_ramfc = {
+	.write = g84_chan_ramfc_write,
+	.ctxdma = true,
+	.devm = 0xfff,
+};
+
 const struct nvkm_chan_func
 g84_chan = {
 	.inst = &nv50_chan_inst,
 	.userd = &nv50_chan_userd,
+	.ramfc = &g84_chan_ramfc,
 	.bind = g84_chan_bind,
 	.unbind = nv50_chan_unbind,
 	.start = nv50_chan_start,
diff --git a/drivers/gpu/drm/nouveau/nvkm/engine/fifo/gf100.c b/drivers/gpu/drm/nouveau/nvkm/engine/fifo/gf100.c
index afee42440ff5..351b35d580fd 100644
--- a/drivers/gpu/drm/nouveau/nvkm/engine/fifo/gf100.c
+++ b/drivers/gpu/drm/nouveau/nvkm/engine/fifo/gf100.c
@@ -82,6 +82,39 @@ gf100_chan_bind(struct nvkm_chan *chan)
 	nvkm_wr32(device, 0x003000 + (chan->id * 8), 0xc0000000 | chan->inst->addr >> 12);
 }
 
+static int
+gf100_chan_ramfc_write(struct nvkm_chan *chan, u64 offset, u64 length, u32 devm, bool priv)
+{
+	const u64 userd = nvkm_memory_addr(chan->userd.mem) + chan->userd.base;
+	const u32 limit2 = ilog2(length / 8);
+
+	nvkm_kmap(chan->inst);
+	nvkm_wo32(chan->inst, 0x08, lower_32_bits(userd));
+	nvkm_wo32(chan->inst, 0x0c, upper_32_bits(userd));
+	nvkm_wo32(chan->inst, 0x10, 0x0000face);
+	nvkm_wo32(chan->inst, 0x30, 0xfffff902);
+	nvkm_wo32(chan->inst, 0x48, lower_32_bits(offset));
+	nvkm_wo32(chan->inst, 0x4c, upper_32_bits(offset) | (limit2 << 16));
+	nvkm_wo32(chan->inst, 0x54, 0x00000002);
+	nvkm_wo32(chan->inst, 0x84, 0x20400000);
+	nvkm_wo32(chan->inst, 0x94, 0x30000000 | devm);
+	nvkm_wo32(chan->inst, 0x9c, 0x00000100);
+	nvkm_wo32(chan->inst, 0xa4, 0x1f1f1f1f);
+	nvkm_wo32(chan->inst, 0xa8, 0x1f1f1f1f);
+	nvkm_wo32(chan->inst, 0xac, 0x0000001f);
+	nvkm_wo32(chan->inst, 0xb8, 0xf8000000);
+	nvkm_wo32(chan->inst, 0xf8, 0x10003080); /* 0x002310 */
+	nvkm_wo32(chan->inst, 0xfc, 0x10000010); /* 0x002350 */
+	nvkm_done(chan->inst);
+	return 0;
+}
+
+static const struct nvkm_chan_func_ramfc
+gf100_chan_ramfc = {
+	.write = gf100_chan_ramfc_write,
+	.devm = 0xfff,
+};
+
 void
 gf100_chan_userd_clear(struct nvkm_chan *chan)
 {
@@ -117,6 +150,7 @@ static const struct nvkm_chan_func
 gf100_chan = {
 	.inst = &gf100_chan_inst,
 	.userd = &gf100_chan_userd,
+	.ramfc = &gf100_chan_ramfc,
 	.bind = gf100_chan_bind,
 	.unbind = gf100_chan_unbind,
 	.start = gf100_chan_start,
diff --git a/drivers/gpu/drm/nouveau/nvkm/engine/fifo/gk104.c b/drivers/gpu/drm/nouveau/nvkm/engine/fifo/gk104.c
index 61966d433bce..b75e3d089da3 100644
--- a/drivers/gpu/drm/nouveau/nvkm/engine/fifo/gk104.c
+++ b/drivers/gpu/drm/nouveau/nvkm/engine/fifo/gk104.c
@@ -78,6 +78,39 @@ gk104_chan_bind(struct nvkm_chan *chan)
 	gk104_chan_bind_inst(chan);
 }
 
+static int
+gk104_chan_ramfc_write(struct nvkm_chan *chan, u64 offset, u64 length, u32 devm, bool priv)
+{
+	const u64 userd = nvkm_memory_addr(chan->userd.mem) + chan->userd.base;
+	const u32 limit2 = ilog2(length / 8);
+
+	nvkm_kmap(chan->inst);
+	nvkm_wo32(chan->inst, 0x08, lower_32_bits(userd));
+	nvkm_wo32(chan->inst, 0x0c, upper_32_bits(userd));
+	nvkm_wo32(chan->inst, 0x10, 0x0000face);
+	nvkm_wo32(chan->inst, 0x30, 0xfffff902);
+	nvkm_wo32(chan->inst, 0x48, lower_32_bits(offset));
+	nvkm_wo32(chan->inst, 0x4c, upper_32_bits(offset) | (limit2 << 16));
+	nvkm_wo32(chan->inst, 0x84, 0x20400000);
+	nvkm_wo32(chan->inst, 0x94, 0x30000000 | devm);
+	nvkm_wo32(chan->inst, 0x9c, 0x00000100);
+	nvkm_wo32(chan->inst, 0xac, 0x0000001f);
+	nvkm_wo32(chan->inst, 0xe4, priv ? 0x00000020 : 0x00000000);
+	nvkm_wo32(chan->inst, 0xe8, chan->id);
+	nvkm_wo32(chan->inst, 0xb8, 0xf8000000);
+	nvkm_wo32(chan->inst, 0xf8, 0x10003080); /* 0x002310 */
+	nvkm_wo32(chan->inst, 0xfc, 0x10000010); /* 0x002350 */
+	nvkm_done(chan->inst);
+	return 0;
+}
+
+const struct nvkm_chan_func_ramfc
+gk104_chan_ramfc = {
+	.write = gk104_chan_ramfc_write,
+	.devm = 0xfff,
+	.priv = true,
+};
+
 const struct nvkm_chan_func_userd
 gk104_chan_userd = {
 	.bar = 1,
@@ -89,6 +122,7 @@ static const struct nvkm_chan_func
 gk104_chan = {
 	.inst = &gf100_chan_inst,
 	.userd = &gk104_chan_userd,
+	.ramfc = &gk104_chan_ramfc,
 	.bind = gk104_chan_bind,
 	.unbind = gk104_chan_unbind,
 	.start = gk104_chan_start,
diff --git a/drivers/gpu/drm/nouveau/nvkm/engine/fifo/gk110.c b/drivers/gpu/drm/nouveau/nvkm/engine/fifo/gk110.c
index 7ff7a435d890..2a617215d924 100644
--- a/drivers/gpu/drm/nouveau/nvkm/engine/fifo/gk110.c
+++ b/drivers/gpu/drm/nouveau/nvkm/engine/fifo/gk110.c
@@ -51,6 +51,7 @@ const struct nvkm_chan_func
 gk110_chan = {
 	.inst = &gf100_chan_inst,
 	.userd = &gk104_chan_userd,
+	.ramfc = &gk104_chan_ramfc,
 	.bind = gk104_chan_bind,
 	.unbind = gk104_chan_unbind,
 	.start = gk104_chan_start,
diff --git a/drivers/gpu/drm/nouveau/nvkm/engine/fifo/gm107.c b/drivers/gpu/drm/nouveau/nvkm/engine/fifo/gm107.c
index cc2638018db7..3764245fbca1 100644
--- a/drivers/gpu/drm/nouveau/nvkm/engine/fifo/gm107.c
+++ b/drivers/gpu/drm/nouveau/nvkm/engine/fifo/gm107.c
@@ -36,6 +36,7 @@ const struct nvkm_chan_func
 gm107_chan = {
 	.inst = &gf100_chan_inst,
 	.userd = &gk104_chan_userd,
+	.ramfc = &gk104_chan_ramfc,
 	.bind = gk104_chan_bind_inst,
 	.unbind = gk104_chan_unbind,
 	.start = gk104_chan_start,
diff --git a/drivers/gpu/drm/nouveau/nvkm/engine/fifo/gpfifog84.c b/drivers/gpu/drm/nouveau/nvkm/engine/fifo/gpfifog84.c
index 3157a7633231..31022441ee8f 100644
--- a/drivers/gpu/drm/nouveau/nvkm/engine/fifo/gpfifog84.c
+++ b/drivers/gpu/drm/nouveau/nvkm/engine/fifo/gpfifog84.c
@@ -65,23 +65,9 @@ g84_fifo_gpfifo_new(struct nvkm_fifo *base, const struct nvkm_oclass *oclass,
 
 	args->v0.chid = chan->base.chid;
 	ioffset = args->v0.ioffset;
-	ilength = order_base_2(args->v0.ilength / 8);
+	ilength = args->v0.ilength;
 
-	nvkm_kmap(chan->ramfc);
-	nvkm_wo32(chan->ramfc, 0x3c, 0x403f6078);
-	nvkm_wo32(chan->ramfc, 0x44, 0x01003fff);
-	nvkm_wo32(chan->ramfc, 0x48, chan->base.push->node->offset >> 4);
-	nvkm_wo32(chan->ramfc, 0x50, lower_32_bits(ioffset));
-	nvkm_wo32(chan->ramfc, 0x54, upper_32_bits(ioffset) | (ilength << 16));
-	nvkm_wo32(chan->ramfc, 0x60, 0x7fffffff);
-	nvkm_wo32(chan->ramfc, 0x78, 0x00000000);
-	nvkm_wo32(chan->ramfc, 0x7c, 0x30000001);
-	nvkm_wo32(chan->ramfc, 0x80, ((chan->ramht->bits - 9) << 27) |
-				     (4 << 24) /* SEARCH_FULL */ |
-				     (chan->ramht->gpuobj->node->offset >> 4));
-	nvkm_wo32(chan->ramfc, 0x88, chan->cache->addr >> 10);
-	nvkm_wo32(chan->ramfc, 0x98, chan->base.inst->addr >> 12);
-	nvkm_done(chan->ramfc);
+	chan->base.func->ramfc->write(&chan->base, ioffset, ilength, BIT(0), false);
 	return 0;
 }
 
diff --git a/drivers/gpu/drm/nouveau/nvkm/engine/fifo/gpfifogf100.c b/drivers/gpu/drm/nouveau/nvkm/engine/fifo/gpfifogf100.c
index 1e459afc36ea..c43cd0c24a6d 100644
--- a/drivers/gpu/drm/nouveau/nvkm/engine/fifo/gpfifogf100.c
+++ b/drivers/gpu/drm/nouveau/nvkm/engine/fifo/gpfifogf100.c
@@ -190,28 +190,9 @@ gf100_fifo_gpfifo_new(struct nvkm_fifo *base, const struct nvkm_oclass *oclass,
 
 	usermem = nvkm_memory_addr(chan->base.userd.mem) + chan->base.userd.base;
 	ioffset = args->v0.ioffset;
-	ilength = order_base_2(args->v0.ilength / 8);
-
-	/* RAMFC */
-	nvkm_kmap(chan->base.inst);
-	nvkm_wo32(chan->base.inst, 0x08, lower_32_bits(usermem));
-	nvkm_wo32(chan->base.inst, 0x0c, upper_32_bits(usermem));
-	nvkm_wo32(chan->base.inst, 0x10, 0x0000face);
-	nvkm_wo32(chan->base.inst, 0x30, 0xfffff902);
-	nvkm_wo32(chan->base.inst, 0x48, lower_32_bits(ioffset));
-	nvkm_wo32(chan->base.inst, 0x4c, upper_32_bits(ioffset) |
-					 (ilength << 16));
-	nvkm_wo32(chan->base.inst, 0x54, 0x00000002);
-	nvkm_wo32(chan->base.inst, 0x84, 0x20400000);
-	nvkm_wo32(chan->base.inst, 0x94, 0x30000001);
-	nvkm_wo32(chan->base.inst, 0x9c, 0x00000100);
-	nvkm_wo32(chan->base.inst, 0xa4, 0x1f1f1f1f);
-	nvkm_wo32(chan->base.inst, 0xa8, 0x1f1f1f1f);
-	nvkm_wo32(chan->base.inst, 0xac, 0x0000001f);
-	nvkm_wo32(chan->base.inst, 0xb8, 0xf8000000);
-	nvkm_wo32(chan->base.inst, 0xf8, 0x10003080); /* 0x002310 */
-	nvkm_wo32(chan->base.inst, 0xfc, 0x10000010); /* 0x002350 */
-	nvkm_done(chan->base.inst);
+	ilength = args->v0.ilength;
+
+	chan->base.func->ramfc->write(&chan->base, ioffset, ilength, BIT(0), false);
 	return 0;
 }
 
diff --git a/drivers/gpu/drm/nouveau/nvkm/engine/fifo/gpfifogk104.c b/drivers/gpu/drm/nouveau/nvkm/engine/fifo/gpfifogk104.c
index b02ec7c545cf..77de170c8144 100644
--- a/drivers/gpu/drm/nouveau/nvkm/engine/fifo/gpfifogk104.c
+++ b/drivers/gpu/drm/nouveau/nvkm/engine/fifo/gpfifogk104.c
@@ -176,7 +176,6 @@ gk104_fifo_gpfifo_new_(struct gk104_fifo *fifo, u64 *runlists, u16 *chid,
 {
 	struct gk104_fifo_chan *chan;
 	int runlist = ffs(*runlists) -1, ret;
-	u64 usermem;
 
 	if (!vmm || runlist < 0 || runlist >= fifo->runlist_nr)
 		return -EINVAL;
@@ -199,28 +198,7 @@ gk104_fifo_gpfifo_new_(struct gk104_fifo *fifo, u64 *runlists, u16 *chid,
 	*chid = chan->base.chid;
 	*inst = chan->base.inst->addr;
 
-	usermem = nvkm_memory_addr(chan->base.userd.mem) + chan->base.userd.base;
-	ilength = order_base_2(ilength / 8);
-
-	/* RAMFC */
-	nvkm_kmap(chan->base.inst);
-	nvkm_wo32(chan->base.inst, 0x08, lower_32_bits(usermem));
-	nvkm_wo32(chan->base.inst, 0x0c, upper_32_bits(usermem));
-	nvkm_wo32(chan->base.inst, 0x10, 0x0000face);
-	nvkm_wo32(chan->base.inst, 0x30, 0xfffff902);
-	nvkm_wo32(chan->base.inst, 0x48, lower_32_bits(ioffset));
-	nvkm_wo32(chan->base.inst, 0x4c, upper_32_bits(ioffset) |
-					 (ilength << 16));
-	nvkm_wo32(chan->base.inst, 0x84, 0x20400000);
-	nvkm_wo32(chan->base.inst, 0x94, 0x30000001);
-	nvkm_wo32(chan->base.inst, 0x9c, 0x00000100);
-	nvkm_wo32(chan->base.inst, 0xac, 0x0000001f);
-	nvkm_wo32(chan->base.inst, 0xe4, priv ? 0x00000020 : 0x00000000);
-	nvkm_wo32(chan->base.inst, 0xe8, chan->base.chid);
-	nvkm_wo32(chan->base.inst, 0xb8, 0xf8000000);
-	nvkm_wo32(chan->base.inst, 0xf8, 0x10003080); /* 0x002310 */
-	nvkm_wo32(chan->base.inst, 0xfc, 0x10000010); /* 0x002350 */
-	nvkm_done(chan->base.inst);
+	chan->base.func->ramfc->write(&chan->base, ioffset, ilength, BIT(0), priv);
 	return 0;
 }
 
diff --git a/drivers/gpu/drm/nouveau/nvkm/engine/fifo/gpfifogv100.c b/drivers/gpu/drm/nouveau/nvkm/engine/fifo/gpfifogv100.c
index 317787954a3e..9a2308be73a2 100644
--- a/drivers/gpu/drm/nouveau/nvkm/engine/fifo/gpfifogv100.c
+++ b/drivers/gpu/drm/nouveau/nvkm/engine/fifo/gpfifogv100.c
@@ -120,7 +120,6 @@ gv100_fifo_gpfifo_new_(const struct nvkm_fifo_chan_func *func,
 {
 	struct gk104_fifo_chan *chan;
 	int runlist = ffs(*runlists) -1, ret;
-	u64 usermem;
 
 	if (!vmm || runlist < 0 || runlist >= fifo->runlist_nr)
 		return -EINVAL;
@@ -143,27 +142,7 @@ gv100_fifo_gpfifo_new_(const struct nvkm_fifo_chan_func *func,
 	*inst = chan->base.inst->addr;
 	*token = chan->base.func->doorbell_handle(&chan->base);
 
-	/* Clear channel control registers. */
-	usermem = nvkm_memory_addr(chan->base.userd.mem) + chan->base.userd.base;
-	ilength = order_base_2(ilength / 8);
-
-	/* RAMFC */
-	nvkm_kmap(chan->base.inst);
-	nvkm_wo32(chan->base.inst, 0x008, lower_32_bits(usermem));
-	nvkm_wo32(chan->base.inst, 0x00c, upper_32_bits(usermem));
-	nvkm_wo32(chan->base.inst, 0x010, 0x0000face);
-	nvkm_wo32(chan->base.inst, 0x030, 0x7ffff902);
-	nvkm_wo32(chan->base.inst, 0x048, lower_32_bits(ioffset));
-	nvkm_wo32(chan->base.inst, 0x04c, upper_32_bits(ioffset) |
-					  (ilength << 16));
-	nvkm_wo32(chan->base.inst, 0x084, 0x20400000);
-	nvkm_wo32(chan->base.inst, 0x094, 0x30000001);
-	nvkm_wo32(chan->base.inst, 0x0e4, priv ? 0x00000020 : 0x00000000);
-	nvkm_wo32(chan->base.inst, 0x0e8, chan->base.chid);
-	nvkm_wo32(chan->base.inst, 0x0f4, 0x00001000);
-	nvkm_wo32(chan->base.inst, 0x0f8, 0x10003080);
-	nvkm_mo32(chan->base.inst, 0x218, 0x00000000, 0x00000000);
-	nvkm_done(chan->base.inst);
+	chan->base.func->ramfc->write(&chan->base, ioffset, ilength, BIT(0), priv);
 	return 0;
 }
 
diff --git a/drivers/gpu/drm/nouveau/nvkm/engine/fifo/gpfifonv50.c b/drivers/gpu/drm/nouveau/nvkm/engine/fifo/gpfifonv50.c
index 410fc9e6c1f9..88ea7c29941e 100644
--- a/drivers/gpu/drm/nouveau/nvkm/engine/fifo/gpfifonv50.c
+++ b/drivers/gpu/drm/nouveau/nvkm/engine/fifo/gpfifonv50.c
@@ -65,21 +65,9 @@ nv50_fifo_gpfifo_new(struct nvkm_fifo *base, const struct nvkm_oclass *oclass,
 
 	args->v0.chid = chan->base.chid;
 	ioffset = args->v0.ioffset;
-	ilength = order_base_2(args->v0.ilength / 8);
+	ilength = args->v0.ilength;
 
-	nvkm_kmap(chan->ramfc);
-	nvkm_wo32(chan->ramfc, 0x3c, 0x403f6078);
-	nvkm_wo32(chan->ramfc, 0x44, 0x01003fff);
-	nvkm_wo32(chan->ramfc, 0x48, chan->base.push->node->offset >> 4);
-	nvkm_wo32(chan->ramfc, 0x50, lower_32_bits(ioffset));
-	nvkm_wo32(chan->ramfc, 0x54, upper_32_bits(ioffset) | (ilength << 16));
-	nvkm_wo32(chan->ramfc, 0x60, 0x7fffffff);
-	nvkm_wo32(chan->ramfc, 0x78, 0x00000000);
-	nvkm_wo32(chan->ramfc, 0x7c, 0x30000001);
-	nvkm_wo32(chan->ramfc, 0x80, ((chan->ramht->bits - 9) << 27) |
-				     (4 << 24) /* SEARCH_FULL */ |
-				     (chan->ramht->gpuobj->node->offset >> 4));
-	nvkm_done(chan->ramfc);
+	chan->base.func->ramfc->write(&chan->base, ioffset, ilength, BIT(0), false);
 	return 0;
 }
 
diff --git a/drivers/gpu/drm/nouveau/nvkm/engine/fifo/gv100.c b/drivers/gpu/drm/nouveau/nvkm/engine/fifo/gv100.c
index 9611bd73c114..ffca153a9a28 100644
--- a/drivers/gpu/drm/nouveau/nvkm/engine/fifo/gv100.c
+++ b/drivers/gpu/drm/nouveau/nvkm/engine/fifo/gv100.c
@@ -38,6 +38,37 @@ gv100_chan_doorbell_handle(struct nvkm_chan *chan)
 	return chan->id;
 }
 
+static int
+gv100_chan_ramfc_write(struct nvkm_chan *chan, u64 offset, u64 length, u32 devm, bool priv)
+{
+	const u64 userd = nvkm_memory_addr(chan->userd.mem) + chan->userd.base;
+	const u32 limit2 = ilog2(length / 8);
+
+	nvkm_kmap(chan->inst);
+	nvkm_wo32(chan->inst, 0x008, lower_32_bits(userd));
+	nvkm_wo32(chan->inst, 0x00c, upper_32_bits(userd));
+	nvkm_wo32(chan->inst, 0x010, 0x0000face);
+	nvkm_wo32(chan->inst, 0x030, 0x7ffff902);
+	nvkm_wo32(chan->inst, 0x048, lower_32_bits(offset));
+	nvkm_wo32(chan->inst, 0x04c, upper_32_bits(offset) | (limit2 << 16));
+	nvkm_wo32(chan->inst, 0x084, 0x20400000);
+	nvkm_wo32(chan->inst, 0x094, 0x30000000 | devm);
+	nvkm_wo32(chan->inst, 0x0e4, priv ? 0x00000020 : 0x00000000);
+	nvkm_wo32(chan->inst, 0x0e8, chan->id);
+	nvkm_wo32(chan->inst, 0x0f4, 0x00001000 | (priv ? 0x00000100 : 0x00000000));
+	nvkm_wo32(chan->inst, 0x0f8, 0x10003080);
+	nvkm_mo32(chan->inst, 0x218, 0x00000000, 0x00000000);
+	nvkm_done(chan->inst);
+	return 0;
+}
+
+const struct nvkm_chan_func_ramfc
+gv100_chan_ramfc = {
+	.write = gv100_chan_ramfc_write,
+	.devm = 0xfff,
+	.priv = true,
+};
+
 const struct nvkm_chan_func_userd
 gv100_chan_userd = {
 	.bar = 1, /*FIXME: hw doesn't have poller, flip to user-allocated in uapi commit. */
@@ -49,6 +80,7 @@ static const struct nvkm_chan_func
 gv100_chan = {
 	.inst = &gf100_chan_inst,
 	.userd = &gv100_chan_userd,
+	.ramfc = &gv100_chan_ramfc,
 	.bind = gk104_chan_bind_inst,
 	.unbind = gk104_chan_unbind,
 	.start = gk104_chan_start,
diff --git a/drivers/gpu/drm/nouveau/nvkm/engine/fifo/nv04.c b/drivers/gpu/drm/nouveau/nvkm/engine/fifo/nv04.c
index f4207100f20c..cf8369b8b881 100644
--- a/drivers/gpu/drm/nouveau/nvkm/engine/fifo/nv04.c
+++ b/drivers/gpu/drm/nouveau/nvkm/engine/fifo/nv04.c
@@ -38,42 +38,29 @@
 
 #include <nvif/class.h>
 
-static const struct nv04_fifo_ramfc
-nv04_fifo_ramfc[] = {
-	{ 32,  0, 0x00,  0, NV04_PFIFO_CACHE1_DMA_PUT },
-	{ 32,  0, 0x04,  0, NV04_PFIFO_CACHE1_DMA_GET },
-	{ 16,  0, 0x08,  0, NV04_PFIFO_CACHE1_DMA_INSTANCE },
-	{ 16, 16, 0x08,  0, NV04_PFIFO_CACHE1_DMA_DCOUNT },
-	{ 32,  0, 0x0c,  0, NV04_PFIFO_CACHE1_DMA_STATE },
-	{ 32,  0, 0x10,  0, NV04_PFIFO_CACHE1_DMA_FETCH },
-	{ 32,  0, 0x14,  0, NV04_PFIFO_CACHE1_ENGINE },
-	{ 32,  0, 0x18,  0, NV04_PFIFO_CACHE1_PULL1 },
-	{}
-};
-
 void
 nv04_chan_stop(struct nvkm_chan *chan)
 {
-	struct nv04_fifo *fifo = nv04_fifo(chan->cgrp->runl->fifo);
-	struct nvkm_device *device = fifo->base.engine.subdev.device;
+	struct nvkm_fifo *fifo = chan->cgrp->runl->fifo;
+	struct nvkm_device *device = fifo->engine.subdev.device;
 	struct nvkm_memory *fctx = device->imem->ramfc;
-	const struct nv04_fifo_ramfc *c;
+	const struct nvkm_ramfc_layout *c;
 	unsigned long flags;
-	u32 data = nv04_fifo_chan(chan)->ramfc;
+	u32 data = chan->ramfc_offset;
 	u32 chid;
 
 	/* prevent fifo context switches */
-	spin_lock_irqsave(&fifo->base.lock, flags);
+	spin_lock_irqsave(&fifo->lock, flags);
 	nvkm_wr32(device, NV03_PFIFO_CACHES, 0);
 
 	/* if this channel is active, replace it with a null context */
-	chid = nvkm_rd32(device, NV03_PFIFO_CACHE1_PUSH1) & fifo->base.chid->mask;
+	chid = nvkm_rd32(device, NV03_PFIFO_CACHE1_PUSH1) & fifo->chid->mask;
 	if (chid == chan->id) {
 		nvkm_mask(device, NV04_PFIFO_CACHE1_DMA_PUSH, 0x00000001, 0);
 		nvkm_wr32(device, NV03_PFIFO_CACHE1_PUSH0, 0);
 		nvkm_mask(device, NV04_PFIFO_CACHE1_PULL0, 0x00000001, 0);
 
-		c = fifo->ramfc;
+		c = chan->func->ramfc->layout;
 		nvkm_kmap(fctx);
 		do {
 			u32 rm = ((1ULL << c->bits) - 1) << c->regs;
@@ -84,14 +71,14 @@ nv04_chan_stop(struct nvkm_chan *chan)
 		} while ((++c)->bits);
 		nvkm_done(fctx);
 
-		c = fifo->ramfc;
+		c = chan->func->ramfc->layout;
 		do {
 			nvkm_wr32(device, c->regp, 0x00000000);
 		} while ((++c)->bits);
 
 		nvkm_wr32(device, NV03_PFIFO_CACHE1_GET, 0);
 		nvkm_wr32(device, NV03_PFIFO_CACHE1_PUT, 0);
-		nvkm_wr32(device, NV03_PFIFO_CACHE1_PUSH1, fifo->base.chid->mask);
+		nvkm_wr32(device, NV03_PFIFO_CACHE1_PUSH1, fifo->chid->mask);
 		nvkm_wr32(device, NV03_PFIFO_CACHE1_PUSH0, 1);
 		nvkm_wr32(device, NV04_PFIFO_CACHE1_PULL0, 1);
 	}
@@ -99,7 +86,7 @@ nv04_chan_stop(struct nvkm_chan *chan)
 	/* restore normal operation, after disabling dma mode */
 	nvkm_mask(device, NV04_PFIFO_MODE, BIT(chan->id), 0);
 	nvkm_wr32(device, NV03_PFIFO_CACHES, 1);
-	spin_unlock_irqrestore(&fifo->base.lock, flags);
+	spin_unlock_irqrestore(&fifo->lock, flags);
 }
 
 void
@@ -113,6 +100,59 @@ nv04_chan_start(struct nvkm_chan *chan)
 	spin_unlock_irqrestore(&fifo->lock, flags);
 }
 
+void
+nv04_chan_ramfc_clear(struct nvkm_chan *chan)
+{
+	struct nvkm_memory *ramfc = chan->cgrp->runl->fifo->engine.subdev.device->imem->ramfc;
+	const struct nvkm_ramfc_layout *c = chan->func->ramfc->layout;
+
+	nvkm_kmap(ramfc);
+	do {
+		nvkm_wo32(ramfc, chan->ramfc_offset + c->ctxp, 0x00000000);
+	} while ((++c)->bits);
+	nvkm_done(ramfc);
+}
+
+static int
+nv04_chan_ramfc_write(struct nvkm_chan *chan, u64 offset, u64 length, u32 devm, bool priv)
+{
+	struct nvkm_memory *ramfc = chan->cgrp->runl->fifo->engine.subdev.device->imem->ramfc;
+	const u32 base = chan->id * 32;
+
+	chan->ramfc_offset = base;
+
+	nvkm_kmap(ramfc);
+	nvkm_wo32(ramfc, base + 0x00, offset);
+	nvkm_wo32(ramfc, base + 0x04, offset);
+	nvkm_wo32(ramfc, base + 0x08, chan->push->addr >> 4);
+	nvkm_wo32(ramfc, base + 0x10, NV_PFIFO_CACHE1_DMA_FETCH_TRIG_128_BYTES |
+				      NV_PFIFO_CACHE1_DMA_FETCH_SIZE_128_BYTES |
+#ifdef __BIG_ENDIAN
+				      NV_PFIFO_CACHE1_BIG_ENDIAN |
+#endif
+				      NV_PFIFO_CACHE1_DMA_FETCH_MAX_REQS_8);
+	nvkm_done(ramfc);
+	return 0;
+}
+
+static const struct nvkm_chan_func_ramfc
+nv04_chan_ramfc = {
+	.layout = (const struct nvkm_ramfc_layout[]) {
+		{ 32,  0, 0x00,  0, NV04_PFIFO_CACHE1_DMA_PUT },
+		{ 32,  0, 0x04,  0, NV04_PFIFO_CACHE1_DMA_GET },
+		{ 16,  0, 0x08,  0, NV04_PFIFO_CACHE1_DMA_INSTANCE },
+		{ 16, 16, 0x08,  0, NV04_PFIFO_CACHE1_DMA_DCOUNT },
+		{ 32,  0, 0x0c,  0, NV04_PFIFO_CACHE1_DMA_STATE },
+		{ 32,  0, 0x10,  0, NV04_PFIFO_CACHE1_DMA_FETCH },
+		{ 32,  0, 0x14,  0, NV04_PFIFO_CACHE1_ENGINE },
+		{ 32,  0, 0x18,  0, NV04_PFIFO_CACHE1_PULL1 },
+		{}
+	},
+	.write = nv04_chan_ramfc_write,
+	.clear = nv04_chan_ramfc_clear,
+	.ctxdma = true,
+};
+
 const struct nvkm_chan_func_userd
 nv04_chan_userd = {
 	.bar = 0,
@@ -129,6 +169,7 @@ static const struct nvkm_chan_func
 nv04_chan = {
 	.inst = &nv04_chan_inst,
 	.userd = &nv04_chan_userd,
+	.ramfc = &nv04_chan_ramfc,
 	.start = nv04_chan_start,
 	.stop = nv04_chan_stop,
 };
@@ -476,7 +517,6 @@ nv04_fifo_new_(const struct nvkm_fifo_func *func, struct nvkm_device *device,
 
 	if (!(fifo = kzalloc(sizeof(*fifo), GFP_KERNEL)))
 		return -ENOMEM;
-	fifo->ramfc = ramfc;
 	*pfifo = &fifo->base;
 
 	ret = nvkm_fifo_ctor(func, device, type, inst, &fifo->base);
@@ -507,5 +547,5 @@ int
 nv04_fifo_new(struct nvkm_device *device, enum nvkm_subdev_type type, int inst,
 	      struct nvkm_fifo **pfifo)
 {
-	return nv04_fifo_new_(&nv04_fifo, device, type, inst, 16, nv04_fifo_ramfc, pfifo);
+	return nv04_fifo_new_(&nv04_fifo, device, type, inst, 0, NULL, pfifo);
 }
diff --git a/drivers/gpu/drm/nouveau/nvkm/engine/fifo/nv04.h b/drivers/gpu/drm/nouveau/nvkm/engine/fifo/nv04.h
index 879c686675d6..93248ab24a81 100644
--- a/drivers/gpu/drm/nouveau/nvkm/engine/fifo/nv04.h
+++ b/drivers/gpu/drm/nouveau/nvkm/engine/fifo/nv04.h
@@ -4,17 +4,10 @@
 #define nv04_fifo(p) container_of((p), struct nv04_fifo, base)
 #include "priv.h"
 
-struct nv04_fifo_ramfc {
-	unsigned bits:6;
-	unsigned ctxs:5;
-	unsigned ctxp:8;
-	unsigned regs:5;
-	unsigned regp;
-};
+#define nv04_fifo_ramfc nvkm_ramfc_layout
 
 struct nv04_fifo {
 	struct nvkm_fifo base;
-	const struct nv04_fifo_ramfc *ramfc;
 };
 
 int nv04_fifo_new_(const struct nvkm_fifo_func *, struct nvkm_device *, enum nvkm_subdev_type, int,
diff --git a/drivers/gpu/drm/nouveau/nvkm/engine/fifo/nv10.c b/drivers/gpu/drm/nouveau/nvkm/engine/fifo/nv10.c
index bbad5ffa179b..c7dbcd236630 100644
--- a/drivers/gpu/drm/nouveau/nvkm/engine/fifo/nv10.c
+++ b/drivers/gpu/drm/nouveau/nvkm/engine/fifo/nv10.c
@@ -21,7 +21,12 @@
  *
  * Authors: Ben Skeggs
  */
+#include "cgrp.h"
 #include "chan.h"
+#include "runl.h"
+
+#include <core/gpuobj.h>
+#include <subdev/instmem.h>
 
 #include "nv04.h"
 #include "channv04.h"
@@ -29,24 +34,52 @@
 
 #include <nvif/class.h>
 
-static const struct nv04_fifo_ramfc
-nv10_fifo_ramfc[] = {
-	{ 32,  0, 0x00,  0, NV04_PFIFO_CACHE1_DMA_PUT },
-	{ 32,  0, 0x04,  0, NV04_PFIFO_CACHE1_DMA_GET },
-	{ 32,  0, 0x08,  0, NV10_PFIFO_CACHE1_REF_CNT },
-	{ 16,  0, 0x0c,  0, NV04_PFIFO_CACHE1_DMA_INSTANCE },
-	{ 16, 16, 0x0c,  0, NV04_PFIFO_CACHE1_DMA_DCOUNT },
-	{ 32,  0, 0x10,  0, NV04_PFIFO_CACHE1_DMA_STATE },
-	{ 32,  0, 0x14,  0, NV04_PFIFO_CACHE1_DMA_FETCH },
-	{ 32,  0, 0x18,  0, NV04_PFIFO_CACHE1_ENGINE },
-	{ 32,  0, 0x1c,  0, NV04_PFIFO_CACHE1_PULL1 },
-	{}
+static int
+nv10_chan_ramfc_write(struct nvkm_chan *chan, u64 offset, u64 length, u32 devm, bool priv)
+{
+	struct nvkm_memory *ramfc = chan->cgrp->runl->fifo->engine.subdev.device->imem->ramfc;
+	const u32 base = chan->id * 32;
+
+	chan->ramfc_offset = base;
+
+	nvkm_kmap(ramfc);
+	nvkm_wo32(ramfc, base + 0x00, offset);
+	nvkm_wo32(ramfc, base + 0x04, offset);
+	nvkm_wo32(ramfc, base + 0x0c, chan->push->addr >> 4);
+	nvkm_wo32(ramfc, base + 0x14, NV_PFIFO_CACHE1_DMA_FETCH_TRIG_128_BYTES |
+				      NV_PFIFO_CACHE1_DMA_FETCH_SIZE_128_BYTES |
+#ifdef __BIG_ENDIAN
+				      NV_PFIFO_CACHE1_BIG_ENDIAN |
+#endif
+				      NV_PFIFO_CACHE1_DMA_FETCH_MAX_REQS_8);
+	nvkm_done(ramfc);
+	return 0;
+}
+
+static const struct nvkm_chan_func_ramfc
+nv10_chan_ramfc = {
+	.layout = (const struct nvkm_ramfc_layout[]) {
+		{ 32,  0, 0x00,  0, NV04_PFIFO_CACHE1_DMA_PUT },
+		{ 32,  0, 0x04,  0, NV04_PFIFO_CACHE1_DMA_GET },
+		{ 32,  0, 0x08,  0, NV10_PFIFO_CACHE1_REF_CNT },
+		{ 16,  0, 0x0c,  0, NV04_PFIFO_CACHE1_DMA_INSTANCE },
+		{ 16, 16, 0x0c,  0, NV04_PFIFO_CACHE1_DMA_DCOUNT },
+		{ 32,  0, 0x10,  0, NV04_PFIFO_CACHE1_DMA_STATE },
+		{ 32,  0, 0x14,  0, NV04_PFIFO_CACHE1_DMA_FETCH },
+		{ 32,  0, 0x18,  0, NV04_PFIFO_CACHE1_ENGINE },
+		{ 32,  0, 0x1c,  0, NV04_PFIFO_CACHE1_PULL1 },
+		{}
+	},
+	.write = nv10_chan_ramfc_write,
+	.clear = nv04_chan_ramfc_clear,
+	.ctxdma = true,
 };
 
 static const struct nvkm_chan_func
 nv10_chan = {
 	.inst = &nv04_chan_inst,
 	.userd = &nv04_chan_userd,
+	.ramfc = &nv10_chan_ramfc,
 	.start = nv04_chan_start,
 	.stop = nv04_chan_stop,
 };
@@ -78,5 +111,5 @@ int
 nv10_fifo_new(struct nvkm_device *device, enum nvkm_subdev_type type, int inst,
 	      struct nvkm_fifo **pfifo)
 {
-	return nv04_fifo_new_(&nv10_fifo, device, type, inst, 32, nv10_fifo_ramfc, pfifo);
+	return nv04_fifo_new_(&nv10_fifo, device, type, inst, 0, NULL, pfifo);
 }
diff --git a/drivers/gpu/drm/nouveau/nvkm/engine/fifo/nv17.c b/drivers/gpu/drm/nouveau/nvkm/engine/fifo/nv17.c
index b0dfa6f1a1d3..a829b0b08f9b 100644
--- a/drivers/gpu/drm/nouveau/nvkm/engine/fifo/nv17.c
+++ b/drivers/gpu/drm/nouveau/nvkm/engine/fifo/nv17.c
@@ -21,8 +21,10 @@
  *
  * Authors: Ben Skeggs
  */
+#include "cgrp.h"
 #include "chan.h"
 #include "chid.h"
+#include "runl.h"
 
 #include "nv04.h"
 #include "channv04.h"
@@ -33,29 +35,57 @@
 
 #include <nvif/class.h>
 
-static const struct nv04_fifo_ramfc
-nv17_fifo_ramfc[] = {
-	{ 32,  0, 0x00,  0, NV04_PFIFO_CACHE1_DMA_PUT },
-	{ 32,  0, 0x04,  0, NV04_PFIFO_CACHE1_DMA_GET },
-	{ 32,  0, 0x08,  0, NV10_PFIFO_CACHE1_REF_CNT },
-	{ 16,  0, 0x0c,  0, NV04_PFIFO_CACHE1_DMA_INSTANCE },
-	{ 16, 16, 0x0c,  0, NV04_PFIFO_CACHE1_DMA_DCOUNT },
-	{ 32,  0, 0x10,  0, NV04_PFIFO_CACHE1_DMA_STATE },
-	{ 32,  0, 0x14,  0, NV04_PFIFO_CACHE1_DMA_FETCH },
-	{ 32,  0, 0x18,  0, NV04_PFIFO_CACHE1_ENGINE },
-	{ 32,  0, 0x1c,  0, NV04_PFIFO_CACHE1_PULL1 },
-	{ 32,  0, 0x20,  0, NV10_PFIFO_CACHE1_ACQUIRE_VALUE },
-	{ 32,  0, 0x24,  0, NV10_PFIFO_CACHE1_ACQUIRE_TIMESTAMP },
-	{ 32,  0, 0x28,  0, NV10_PFIFO_CACHE1_ACQUIRE_TIMEOUT },
-	{ 32,  0, 0x2c,  0, NV10_PFIFO_CACHE1_SEMAPHORE },
-	{ 32,  0, 0x30,  0, NV10_PFIFO_CACHE1_DMA_SUBROUTINE },
-	{}
+static int
+nv17_chan_ramfc_write(struct nvkm_chan *chan, u64 offset, u64 length, u32 devm, bool priv)
+{
+	struct nvkm_memory *ramfc = chan->cgrp->runl->fifo->engine.subdev.device->imem->ramfc;
+	const u32 base = chan->id * 64;
+
+	chan->ramfc_offset = base;
+
+	nvkm_kmap(ramfc);
+	nvkm_wo32(ramfc, base + 0x00, offset);
+	nvkm_wo32(ramfc, base + 0x04, offset);
+	nvkm_wo32(ramfc, base + 0x0c, chan->push->addr >> 4);
+	nvkm_wo32(ramfc, base + 0x14, NV_PFIFO_CACHE1_DMA_FETCH_TRIG_128_BYTES |
+				      NV_PFIFO_CACHE1_DMA_FETCH_SIZE_128_BYTES |
+#ifdef __BIG_ENDIAN
+				      NV_PFIFO_CACHE1_BIG_ENDIAN |
+#endif
+				      NV_PFIFO_CACHE1_DMA_FETCH_MAX_REQS_8);
+	nvkm_done(ramfc);
+	return 0;
+}
+
+static const struct nvkm_chan_func_ramfc
+nv17_chan_ramfc = {
+	.layout = (const struct nvkm_ramfc_layout[]) {
+		{ 32,  0, 0x00,  0, NV04_PFIFO_CACHE1_DMA_PUT },
+		{ 32,  0, 0x04,  0, NV04_PFIFO_CACHE1_DMA_GET },
+		{ 32,  0, 0x08,  0, NV10_PFIFO_CACHE1_REF_CNT },
+		{ 16,  0, 0x0c,  0, NV04_PFIFO_CACHE1_DMA_INSTANCE },
+		{ 16, 16, 0x0c,  0, NV04_PFIFO_CACHE1_DMA_DCOUNT },
+		{ 32,  0, 0x10,  0, NV04_PFIFO_CACHE1_DMA_STATE },
+		{ 32,  0, 0x14,  0, NV04_PFIFO_CACHE1_DMA_FETCH },
+		{ 32,  0, 0x18,  0, NV04_PFIFO_CACHE1_ENGINE },
+		{ 32,  0, 0x1c,  0, NV04_PFIFO_CACHE1_PULL1 },
+		{ 32,  0, 0x20,  0, NV10_PFIFO_CACHE1_ACQUIRE_VALUE },
+		{ 32,  0, 0x24,  0, NV10_PFIFO_CACHE1_ACQUIRE_TIMESTAMP },
+		{ 32,  0, 0x28,  0, NV10_PFIFO_CACHE1_ACQUIRE_TIMEOUT },
+		{ 32,  0, 0x2c,  0, NV10_PFIFO_CACHE1_SEMAPHORE },
+		{ 32,  0, 0x30,  0, NV10_PFIFO_CACHE1_DMA_SUBROUTINE },
+		{}
+	},
+	.write = nv17_chan_ramfc_write,
+	.clear = nv04_chan_ramfc_clear,
+	.ctxdma = true,
 };
 
 static const struct nvkm_chan_func
 nv17_chan = {
 	.inst = &nv04_chan_inst,
 	.userd = &nv04_chan_userd,
+	.ramfc = &nv17_chan_ramfc,
 	.start = nv04_chan_start,
 	.stop = nv04_chan_stop,
 };
@@ -110,5 +140,5 @@ int
 nv17_fifo_new(struct nvkm_device *device, enum nvkm_subdev_type type, int inst,
 	      struct nvkm_fifo **pfifo)
 {
-	return nv04_fifo_new_(&nv17_fifo, device, type, inst, 32, nv17_fifo_ramfc, pfifo);
+	return nv04_fifo_new_(&nv17_fifo, device, type, inst, 0, NULL, pfifo);
 }
diff --git a/drivers/gpu/drm/nouveau/nvkm/engine/fifo/nv40.c b/drivers/gpu/drm/nouveau/nvkm/engine/fifo/nv40.c
index c2dc2d7abc9d..faf19ec3b323 100644
--- a/drivers/gpu/drm/nouveau/nvkm/engine/fifo/nv40.c
+++ b/drivers/gpu/drm/nouveau/nvkm/engine/fifo/nv40.c
@@ -21,6 +21,7 @@
  *
  * Authors: Ben Skeggs
  */
+#include "cgrp.h"
 #include "chan.h"
 #include "chid.h"
 #include "runl.h"
@@ -35,31 +36,61 @@
 
 #include <nvif/class.h>
 
-static const struct nv04_fifo_ramfc
-nv40_fifo_ramfc[] = {
-	{ 32,  0, 0x00,  0, NV04_PFIFO_CACHE1_DMA_PUT },
-	{ 32,  0, 0x04,  0, NV04_PFIFO_CACHE1_DMA_GET },
-	{ 32,  0, 0x08,  0, NV10_PFIFO_CACHE1_REF_CNT },
-	{ 32,  0, 0x0c,  0, NV04_PFIFO_CACHE1_DMA_INSTANCE },
-	{ 32,  0, 0x10,  0, NV04_PFIFO_CACHE1_DMA_DCOUNT },
-	{ 32,  0, 0x14,  0, NV04_PFIFO_CACHE1_DMA_STATE },
-	{ 28,  0, 0x18,  0, NV04_PFIFO_CACHE1_DMA_FETCH },
-	{  2, 28, 0x18, 28, 0x002058 },
-	{ 32,  0, 0x1c,  0, NV04_PFIFO_CACHE1_ENGINE },
-	{ 32,  0, 0x20,  0, NV04_PFIFO_CACHE1_PULL1 },
-	{ 32,  0, 0x24,  0, NV10_PFIFO_CACHE1_ACQUIRE_VALUE },
-	{ 32,  0, 0x28,  0, NV10_PFIFO_CACHE1_ACQUIRE_TIMESTAMP },
-	{ 32,  0, 0x2c,  0, NV10_PFIFO_CACHE1_ACQUIRE_TIMEOUT },
-	{ 32,  0, 0x30,  0, NV10_PFIFO_CACHE1_SEMAPHORE },
-	{ 32,  0, 0x34,  0, NV10_PFIFO_CACHE1_DMA_SUBROUTINE },
-	{ 32,  0, 0x38,  0, NV40_PFIFO_GRCTX_INSTANCE },
-	{ 17,  0, 0x3c,  0, NV04_PFIFO_DMA_TIMESLICE },
-	{ 32,  0, 0x40,  0, 0x0032e4 },
-	{ 32,  0, 0x44,  0, 0x0032e8 },
-	{ 32,  0, 0x4c,  0, 0x002088 },
-	{ 32,  0, 0x50,  0, 0x003300 },
-	{ 32,  0, 0x54,  0, 0x00330c },
-	{}
+static int
+nv40_chan_ramfc_write(struct nvkm_chan *chan, u64 offset, u64 length, u32 devm, bool priv)
+{
+	struct nvkm_memory *ramfc = chan->cgrp->runl->fifo->engine.subdev.device->imem->ramfc;
+	const u32 base = chan->id * 128;
+
+	chan->ramfc_offset = base;
+	nv04_fifo_chan(chan)->ramfc = base;
+
+	nvkm_kmap(ramfc);
+	nvkm_wo32(ramfc, base + 0x00, offset);
+	nvkm_wo32(ramfc, base + 0x04, offset);
+	nvkm_wo32(ramfc, base + 0x0c, chan->push->addr >> 4);
+	nvkm_wo32(ramfc, base + 0x18, 0x30000000 |
+				      NV_PFIFO_CACHE1_DMA_FETCH_TRIG_128_BYTES |
+				      NV_PFIFO_CACHE1_DMA_FETCH_SIZE_128_BYTES |
+#ifdef __BIG_ENDIAN
+				      NV_PFIFO_CACHE1_BIG_ENDIAN |
+#endif
+				      NV_PFIFO_CACHE1_DMA_FETCH_MAX_REQS_8);
+	nvkm_wo32(ramfc, base + 0x3c, 0x0001ffff);
+	nvkm_done(ramfc);
+	return 0;
+}
+
+static const struct nvkm_chan_func_ramfc
+nv40_chan_ramfc = {
+	.layout = (const struct nvkm_ramfc_layout[]) {
+		{ 32,  0, 0x00,  0, NV04_PFIFO_CACHE1_DMA_PUT },
+		{ 32,  0, 0x04,  0, NV04_PFIFO_CACHE1_DMA_GET },
+		{ 32,  0, 0x08,  0, NV10_PFIFO_CACHE1_REF_CNT },
+		{ 32,  0, 0x0c,  0, NV04_PFIFO_CACHE1_DMA_INSTANCE },
+		{ 32,  0, 0x10,  0, NV04_PFIFO_CACHE1_DMA_DCOUNT },
+		{ 32,  0, 0x14,  0, NV04_PFIFO_CACHE1_DMA_STATE },
+		{ 28,  0, 0x18,  0, NV04_PFIFO_CACHE1_DMA_FETCH },
+		{  2, 28, 0x18, 28, 0x002058 },
+		{ 32,  0, 0x1c,  0, NV04_PFIFO_CACHE1_ENGINE },
+		{ 32,  0, 0x20,  0, NV04_PFIFO_CACHE1_PULL1 },
+		{ 32,  0, 0x24,  0, NV10_PFIFO_CACHE1_ACQUIRE_VALUE },
+		{ 32,  0, 0x28,  0, NV10_PFIFO_CACHE1_ACQUIRE_TIMESTAMP },
+		{ 32,  0, 0x2c,  0, NV10_PFIFO_CACHE1_ACQUIRE_TIMEOUT },
+		{ 32,  0, 0x30,  0, NV10_PFIFO_CACHE1_SEMAPHORE },
+		{ 32,  0, 0x34,  0, NV10_PFIFO_CACHE1_DMA_SUBROUTINE },
+		{ 32,  0, 0x38,  0, NV40_PFIFO_GRCTX_INSTANCE },
+		{ 17,  0, 0x3c,  0, NV04_PFIFO_DMA_TIMESLICE },
+		{ 32,  0, 0x40,  0, 0x0032e4 },
+		{ 32,  0, 0x44,  0, 0x0032e8 },
+		{ 32,  0, 0x4c,  0, 0x002088 },
+		{ 32,  0, 0x50,  0, 0x003300 },
+		{ 32,  0, 0x54,  0, 0x00330c },
+		{}
+	},
+	.write = nv40_chan_ramfc_write,
+	.clear = nv04_chan_ramfc_clear,
+	.ctxdma = true,
 };
 
 static const struct nvkm_chan_func_userd
@@ -73,6 +104,7 @@ static const struct nvkm_chan_func
 nv40_chan = {
 	.inst = &nv04_chan_inst,
 	.userd = &nv40_chan_userd,
+	.ramfc = &nv40_chan_ramfc,
 	.start = nv04_chan_start,
 	.stop = nv04_chan_stop,
 };
@@ -157,5 +189,5 @@ int
 nv40_fifo_new(struct nvkm_device *device, enum nvkm_subdev_type type, int inst,
 	      struct nvkm_fifo **pfifo)
 {
-	return nv04_fifo_new_(&nv40_fifo, device, type, inst, 32, nv40_fifo_ramfc, pfifo);
+	return nv04_fifo_new_(&nv40_fifo, device, type, inst, 0, NULL, pfifo);
 }
diff --git a/drivers/gpu/drm/nouveau/nvkm/engine/fifo/nv50.c b/drivers/gpu/drm/nouveau/nvkm/engine/fifo/nv50.c
index 24b458048180..7d5c0d026967 100644
--- a/drivers/gpu/drm/nouveau/nvkm/engine/fifo/nv50.c
+++ b/drivers/gpu/drm/nouveau/nvkm/engine/fifo/nv50.c
@@ -26,7 +26,7 @@
 #include "chid.h"
 #include "runl.h"
 
-#include <core/gpuobj.h>
+#include <core/ramht.h>
 #include <subdev/timer.h>
 
 #include "nv50.h"
@@ -63,9 +63,58 @@ nv50_chan_bind(struct nvkm_chan *chan)
 {
 	struct nvkm_device *device = chan->cgrp->runl->fifo->engine.subdev.device;
 
-	nvkm_wr32(device, 0x002600 + (chan->id * 4), nv50_fifo_chan(chan)->ramfc->addr >> 12);
+	nvkm_wr32(device, 0x002600 + (chan->id * 4), chan->ramfc->addr >> 12);
 }
 
+static int
+nv50_chan_ramfc_write(struct nvkm_chan *chan, u64 offset, u64 length, u32 devm, bool priv)
+{
+	struct nvkm_device *device = chan->cgrp->runl->fifo->engine.subdev.device;
+	const u32 limit2 = ilog2(length / 8);
+	int ret;
+
+	ret = nvkm_gpuobj_new(device, 0x0200, 0x1000, true, chan->inst, &chan->ramfc);
+	if (ret)
+		return ret;
+
+	ret = nvkm_gpuobj_new(device, 0x1200, 0, true, chan->inst, &chan->eng);
+	if (ret)
+		return ret;
+
+	ret = nvkm_gpuobj_new(device, 0x4000, 0, false, chan->inst, &chan->pgd);
+	if (ret)
+		return ret;
+
+	ret = nvkm_ramht_new(device, 0x8000, 16, chan->inst, &chan->ramht);
+	if (ret)
+		return ret;
+
+	nv50_fifo_chan(chan)->eng = chan->eng;
+	nv50_fifo_chan(chan)->ramht = chan->ramht;
+
+	nvkm_kmap(chan->ramfc);
+	nvkm_wo32(chan->ramfc, 0x3c, 0x403f6078);
+	nvkm_wo32(chan->ramfc, 0x44, 0x01003fff);
+	nvkm_wo32(chan->ramfc, 0x48, chan->push->node->offset >> 4);
+	nvkm_wo32(chan->ramfc, 0x50, lower_32_bits(offset));
+	nvkm_wo32(chan->ramfc, 0x54, upper_32_bits(offset) | (limit2 << 16));
+	nvkm_wo32(chan->ramfc, 0x60, 0x7fffffff);
+	nvkm_wo32(chan->ramfc, 0x78, 0x00000000);
+	nvkm_wo32(chan->ramfc, 0x7c, 0x30000000 | devm);
+	nvkm_wo32(chan->ramfc, 0x80, ((chan->ramht->bits - 9) << 27) |
+				     (4 << 24) /* SEARCH_FULL */ |
+				     (chan->ramht->gpuobj->node->offset >> 4));
+	nvkm_done(chan->ramfc);
+	return 0;
+}
+
+static const struct nvkm_chan_func_ramfc
+nv50_chan_ramfc = {
+	.write = nv50_chan_ramfc_write,
+	.ctxdma = true,
+	.devm = 0xfff,
+};
+
 const struct nvkm_chan_func_userd
 nv50_chan_userd = {
 	.bar = 0,
@@ -83,6 +132,7 @@ static const struct nvkm_chan_func
 nv50_chan = {
 	.inst = &nv50_chan_inst,
 	.userd = &nv50_chan_userd,
+	.ramfc = &nv50_chan_ramfc,
 	.bind = nv50_chan_bind,
 	.unbind = nv50_chan_unbind,
 	.start = nv50_chan_start,
diff --git a/drivers/gpu/drm/nouveau/nvkm/engine/fifo/priv.h b/drivers/gpu/drm/nouveau/nvkm/engine/fifo/priv.h
index c56deb78e9cc..43f248a109f6 100644
--- a/drivers/gpu/drm/nouveau/nvkm/engine/fifo/priv.h
+++ b/drivers/gpu/drm/nouveau/nvkm/engine/fifo/priv.h
@@ -82,6 +82,7 @@ extern const struct nvkm_engn_func nv04_engn;
 extern const struct nvkm_cgrp_func nv04_cgrp;
 extern const struct nvkm_chan_func_inst nv04_chan_inst;
 extern const struct nvkm_chan_func_userd nv04_chan_userd;
+void nv04_chan_ramfc_clear(struct nvkm_chan *);
 void nv04_chan_start(struct nvkm_chan *);
 void nv04_chan_stop(struct nvkm_chan *);
 
@@ -154,6 +155,7 @@ bool gk104_engn_chsw(struct nvkm_engn *);
 int gk104_engn_cxid(struct nvkm_engn *, bool *cgid);
 extern const struct nvkm_engn_func gk104_engn_ce;
 extern const struct nvkm_chan_func_userd gk104_chan_userd;
+extern const struct nvkm_chan_func_ramfc gk104_chan_ramfc;
 void gk104_chan_bind(struct nvkm_chan *);
 void gk104_chan_bind_inst(struct nvkm_chan *);
 void gk104_chan_unbind(struct nvkm_chan *);
@@ -189,6 +191,7 @@ extern const struct nvkm_runq_func gv100_runq;
 extern const struct nvkm_engn_func gv100_engn;
 extern const struct nvkm_engn_func gv100_engn_ce;
 extern const struct nvkm_chan_func_userd gv100_chan_userd;
+extern const struct nvkm_chan_func_ramfc gv100_chan_ramfc;
 
 void tu102_fifo_intr_ctxsw_timeout_info(struct nvkm_engn *, u32 info);
 extern const struct nvkm_fifo_func_mmu_fault tu102_fifo_mmu_fault;
diff --git a/drivers/gpu/drm/nouveau/nvkm/engine/fifo/tu102.c b/drivers/gpu/drm/nouveau/nvkm/engine/fifo/tu102.c
index 42d2975b82aa..a8452eee2949 100644
--- a/drivers/gpu/drm/nouveau/nvkm/engine/fifo/tu102.c
+++ b/drivers/gpu/drm/nouveau/nvkm/engine/fifo/tu102.c
@@ -51,6 +51,7 @@ static const struct nvkm_chan_func
 tu102_chan = {
 	.inst = &gf100_chan_inst,
 	.userd = &gv100_chan_userd,
+	.ramfc = &gv100_chan_ramfc,
 	.bind = gk104_chan_bind_inst,
 	.unbind = gk104_chan_unbind,
 	.start = tu102_chan_start,