On Tue, Sep 7, 2021 at 1:28 AM Ben Skeggs <skeggsb@xxxxxxxxx> wrote:
>
> On Tue, 7 Sept 2021 at 09:17, Karol Herbst <kherbst@xxxxxxxxxx> wrote:
> >
> > ."
> >
> >
> > On Mon, Sep 6, 2021 at 2:56 AM Ben Skeggs <skeggsb@xxxxxxxxx> wrote:
> > >
> > > From: Ben Skeggs <bskeggs@xxxxxxxxxx>
> > >
> > > We don't currently have any kind of real acceleration on Ampere GPUs,
> > > but the TTM memcpy() fallback paths aren't really designed to handle
> > > copies between different devices, such as on Optimus systems, and
> > > result in a kernel OOPS.
> > >
> > > A few options were investigated to try and fix this, but didn't work
> > > out, and likely would have resulted in a very unpleasant experience
> > > for users anyway.
> > >
> > > This commit adds just enough support for setting up a single channel
> > > connected to a copy engine, which the kernel can use to accelerate
> > > the buffer copies between devices. Userspace has no access to this
> > > incomplete channel support, but it's suitable for TTM's needs.
> > >
> > > A more complete implementation of host(fifo) for Ampere GPUs is in
> > > the works, but the required changes are far too invasive that they
> > > would be unsuitable to backport to fix this issue on current kernels.
> > >
> > > Signed-off-by: Ben Skeggs <bskeggs@xxxxxxxxxx>
> > > Cc: Lyude Paul <lyude@xxxxxxxxxx>
> > > Cc: Karol Herbst <kherbst@xxxxxxxxxx>
> > > Cc: <stable@xxxxxxxxxxxxxxx> # v5.12+
> > > ---
> > > drivers/gpu/drm/nouveau/include/nvif/class.h | 2 +
> > > .../drm/nouveau/include/nvkm/engine/fifo.h | 1 +
> > > drivers/gpu/drm/nouveau/nouveau_bo.c | 1 +
> > > drivers/gpu/drm/nouveau/nouveau_chan.c | 6 +-
> > > drivers/gpu/drm/nouveau/nouveau_drm.c | 4 +
> > > drivers/gpu/drm/nouveau/nv84_fence.c | 2 +-
> > > .../gpu/drm/nouveau/nvkm/engine/device/base.c | 3 +
> > > .../gpu/drm/nouveau/nvkm/engine/fifo/Kbuild | 1 +
> > > .../gpu/drm/nouveau/nvkm/engine/fifo/ga102.c | 308 ++++++++++++++++++
> > > .../gpu/drm/nouveau/nvkm/subdev/top/ga100.c | 7 +-
> > > 10 files changed, 329 insertions(+), 6 deletions(-)
> > > create mode 100644 drivers/gpu/drm/nouveau/nvkm/engine/fifo/ga102.c
> > >
> > > diff --git a/drivers/gpu/drm/nouveau/include/nvif/class.h b/drivers/gpu/drm/nouveau/include/nvif/class.h
> > > index c68cc957248e..a582c0cb0cb0 100644
> > > --- a/drivers/gpu/drm/nouveau/include/nvif/class.h
> > > +++ b/drivers/gpu/drm/nouveau/include/nvif/class.h
> > > @@ -71,6 +71,7 @@
> > > #define PASCAL_CHANNEL_GPFIFO_A /* cla06f.h */ 0x0000c06f
> > > #define VOLTA_CHANNEL_GPFIFO_A /* clc36f.h */ 0x0000c36f
> > > #define TURING_CHANNEL_GPFIFO_A /* clc36f.h */ 0x0000c46f
> > > +#define AMPERE_CHANNEL_GPFIFO_B /* clc36f.h */ 0x0000c76f
> > >
> > > #define NV50_DISP /* cl5070.h */ 0x00005070
> > > #define G82_DISP /* cl5070.h */ 0x00008270
> > > @@ -200,6 +201,7 @@
> > > #define PASCAL_DMA_COPY_B 0x0000c1b5
> > > #define VOLTA_DMA_COPY_A 0x0000c3b5
> > > #define TURING_DMA_COPY_A 0x0000c5b5
> > > +#define AMPERE_DMA_COPY_B 0x0000c7b5
> > >
> > > #define FERMI_DECOMPRESS 0x000090b8
> > >
> > > diff --git a/drivers/gpu/drm/nouveau/include/nvkm/engine/fifo.h b/drivers/gpu/drm/nouveau/include/nvkm/engine/fifo.h
> > > index 54fab7cc36c1..64ee82c7c1be 100644
> > > --- a/drivers/gpu/drm/nouveau/include/nvkm/engine/fifo.h
> > > +++ b/drivers/gpu/drm/nouveau/include/nvkm/engine/fifo.h
> > > @@ -77,4 +77,5 @@ int gp100_fifo_new(struct nvkm_device *, enum nvkm_subdev_type, int inst, struct
> > > int gp10b_fifo_new(struct nvkm_device *, enum nvkm_subdev_type, int inst, struct nvkm_fifo **);
> > > int gv100_fifo_new(struct nvkm_device *, enum nvkm_subdev_type, int inst, struct nvkm_fifo **);
> > > int tu102_fifo_new(struct nvkm_device *, enum nvkm_subdev_type, int inst, struct nvkm_fifo **);
> > > +int ga102_fifo_new(struct nvkm_device *, enum nvkm_subdev_type, int inst, struct nvkm_fifo **);
> > > #endif
> > > diff --git a/drivers/gpu/drm/nouveau/nouveau_bo.c b/drivers/gpu/drm/nouveau/nouveau_bo.c
> > > index 4a7cebac8060..b3e4f555fa05 100644
> > > --- a/drivers/gpu/drm/nouveau/nouveau_bo.c
> > > +++ b/drivers/gpu/drm/nouveau/nouveau_bo.c
> > > @@ -844,6 +844,7 @@ nouveau_bo_move_init(struct nouveau_drm *drm)
> > > struct ttm_resource *, struct ttm_resource *);
> > > int (*init)(struct nouveau_channel *, u32 handle);
> > > } _methods[] = {
> > > + { "COPY", 4, 0xc7b5, nve0_bo_move_copy, nve0_bo_move_init },
> >
> > so, I was looking at the COPY class headers and noticed something strange.
> >
> > "BYPASS_L2" was moved with MAXWELL_DMA_COPY_A from bit 11 to bit 20.
> > It got split out to SRC_ (20) and DST_ (21) with PASCAL_DMA_COPY_A and
> > got removed with AMPERE_DMA_COPY_A.
> >
> > Since MAXWELL_DMA_COPY_A bit 11 is FORCE_RMWDISABLE. I don't know if
> > that causes any issues, I just noticed this while comparing the copy
> > class headers.
> Yeah, I think for the way we're using the CE for TTM moves, it's OK.
> In the very least, no more wrong that it already is on existing GPUs
> ;)
>
> >
> > > { "COPY", 4, 0xc5b5, nve0_bo_move_copy, nve0_bo_move_init },
> > > { "GRCE", 0, 0xc5b5, nve0_bo_move_copy, nvc0_bo_move_init },
> > > { "COPY", 4, 0xc3b5, nve0_bo_move_copy, nve0_bo_move_init },
> > > diff --git a/drivers/gpu/drm/nouveau/nouveau_chan.c b/drivers/gpu/drm/nouveau/nouveau_chan.c
> > > index 80099ef75702..ea7769135b0d 100644
> > > --- a/drivers/gpu/drm/nouveau/nouveau_chan.c
> > > +++ b/drivers/gpu/drm/nouveau/nouveau_chan.c
> > > @@ -250,7 +250,8 @@ static int
> > > nouveau_channel_ind(struct nouveau_drm *drm, struct nvif_device *device,
> > > u64 runlist, bool priv, struct nouveau_channel **pchan)
> > > {
> > > - static const u16 oclasses[] = { TURING_CHANNEL_GPFIFO_A,
> > > + static const u16 oclasses[] = { AMPERE_CHANNEL_GPFIFO_B,
> > > + TURING_CHANNEL_GPFIFO_A,
> > > VOLTA_CHANNEL_GPFIFO_A,
> > > PASCAL_CHANNEL_GPFIFO_A,
> > > MAXWELL_CHANNEL_GPFIFO_A,
> > > @@ -386,7 +387,8 @@ nouveau_channel_init(struct nouveau_channel *chan, u32 vram, u32 gart)
> > >
> > > nvif_object_map(&chan->user, NULL, 0);
> > >
> > > - if (chan->user.oclass >= FERMI_CHANNEL_GPFIFO) {
> > > + if (chan->user.oclass >= FERMI_CHANNEL_GPFIFO &&
> > > + chan->user.oclass < AMPERE_CHANNEL_GPFIFO_B) {
> > > ret = nvif_notify_ctor(&chan->user, "abi16ChanKilled",
> > > nouveau_channel_killed,
> > > true, NV906F_V0_NTFY_KILLED,
> > > diff --git a/drivers/gpu/drm/nouveau/nouveau_drm.c b/drivers/gpu/drm/nouveau/nouveau_drm.c
> > > index 1f828c9f691c..6109cd9e3399 100644
> > > --- a/drivers/gpu/drm/nouveau/nouveau_drm.c
> > > +++ b/drivers/gpu/drm/nouveau/nouveau_drm.c
> > > @@ -345,6 +345,9 @@ nouveau_accel_gr_init(struct nouveau_drm *drm)
> > > u32 arg0, arg1;
> > > int ret;
> > >
> > > + if (device->info.family >= NV_DEVICE_INFO_V0_AMPERE)
> > > + return;
> > > +
> > > /* Allocate channel that has access to the graphics engine. */
> > > if (device->info.family >= NV_DEVICE_INFO_V0_KEPLER) {
> > > arg0 = nvif_fifo_runlist(device, NV_DEVICE_HOST_RUNLIST_ENGINES_GR);
> > > @@ -469,6 +472,7 @@ nouveau_accel_init(struct nouveau_drm *drm)
> > > case PASCAL_CHANNEL_GPFIFO_A:
> > > case VOLTA_CHANNEL_GPFIFO_A:
> > > case TURING_CHANNEL_GPFIFO_A:
> > > + case AMPERE_CHANNEL_GPFIFO_B:
> > > ret = nvc0_fence_create(drm);
> > > break;
> > > default:
> > > diff --git a/drivers/gpu/drm/nouveau/nv84_fence.c b/drivers/gpu/drm/nouveau/nv84_fence.c
> > > index 7c9c928c3196..c3526a8622e3 100644
> > > --- a/drivers/gpu/drm/nouveau/nv84_fence.c
> > > +++ b/drivers/gpu/drm/nouveau/nv84_fence.c
> > > @@ -204,7 +204,7 @@ nv84_fence_create(struct nouveau_drm *drm)
> > > priv->base.context_new = nv84_fence_context_new;
> > > priv->base.context_del = nv84_fence_context_del;
> > >
> > > - priv->base.uevent = true;
> > > + priv->base.uevent = drm->client.device.info.family < NV_DEVICE_INFO_V0_AMPERE;
> > >
> > > mutex_init(&priv->mutex);
> > >
> > > diff --git a/drivers/gpu/drm/nouveau/nvkm/engine/device/base.c b/drivers/gpu/drm/nouveau/nvkm/engine/device/base.c
> > > index 93ddf63d1114..ca75c5f6ecaf 100644
> > > --- a/drivers/gpu/drm/nouveau/nvkm/engine/device/base.c
> > > +++ b/drivers/gpu/drm/nouveau/nvkm/engine/device/base.c
> > > @@ -2602,6 +2602,7 @@ nv172_chipset = {
> > > .top = { 0x00000001, ga100_top_new },
> > > .disp = { 0x00000001, ga102_disp_new },
> > > .dma = { 0x00000001, gv100_dma_new },
> > > + .fifo = { 0x00000001, ga102_fifo_new },
> > > };
> > >
> > > static const struct nvkm_device_chip
> > > @@ -2622,6 +2623,7 @@ nv174_chipset = {
> > > .top = { 0x00000001, ga100_top_new },
> > > .disp = { 0x00000001, ga102_disp_new },
> > > .dma = { 0x00000001, gv100_dma_new },
> > > + .fifo = { 0x00000001, ga102_fifo_new },
> > > };
> > >
> > > static const struct nvkm_device_chip
> > > @@ -2642,6 +2644,7 @@ nv177_chipset = {
> > > .top = { 0x00000001, ga100_top_new },
> > > .disp = { 0x00000001, ga102_disp_new },
> > > .dma = { 0x00000001, gv100_dma_new },
> > > + .fifo = { 0x00000001, ga102_fifo_new },
> > > };
> > >
> > > static int
> > > diff --git a/drivers/gpu/drm/nouveau/nvkm/engine/fifo/Kbuild b/drivers/gpu/drm/nouveau/nvkm/engine/fifo/Kbuild
> > > index 3209eb7af65f..5e831d347a95 100644
> > > --- a/drivers/gpu/drm/nouveau/nvkm/engine/fifo/Kbuild
> > > +++ b/drivers/gpu/drm/nouveau/nvkm/engine/fifo/Kbuild
> > > @@ -18,6 +18,7 @@ nvkm-y += nvkm/engine/fifo/gp100.o
> > > nvkm-y += nvkm/engine/fifo/gp10b.o
> > > nvkm-y += nvkm/engine/fifo/gv100.o
> > > nvkm-y += nvkm/engine/fifo/tu102.o
> > > +nvkm-y += nvkm/engine/fifo/ga102.o
> > >
> > > nvkm-y += nvkm/engine/fifo/chan.o
> > > nvkm-y += nvkm/engine/fifo/channv50.o
> > > diff --git a/drivers/gpu/drm/nouveau/nvkm/engine/fifo/ga102.c b/drivers/gpu/drm/nouveau/nvkm/engine/fifo/ga102.c
> > > new file mode 100644
> > > index 000000000000..bfb66457100c
> > > --- /dev/null
> > > +++ b/drivers/gpu/drm/nouveau/nvkm/engine/fifo/ga102.c
> > > @@ -0,0 +1,308 @@
> > > +/*
> > > + * 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 ga102_fifo(p) container_of((p), struct ga102_fifo, base.engine)
> > > +#define ga102_chan(p) container_of((p), struct ga102_chan, object)
> > > +#include <engine/fifo.h>
> > > +#include "user.h"
> > > +
> > > +#include <core/memory.h>
> > > +#include <subdev/mmu.h>
> > > +#include <subdev/timer.h>
> > > +#include <subdev/top.h>
> > > +
> > > +#include <nvif/cl0080.h>
> > > +#include <nvif/clc36f.h>
> > > +#include <nvif/class.h>
> > > +
> > > +struct ga102_fifo {
> > > + struct nvkm_fifo base;
> > > +};
> > > +
> > > +struct ga102_chan {
> > > + struct nvkm_object object;
> > > +
> > > + struct {
> > > + u32 runl;
> > > + u32 chan;
> > > + } ctrl;
> > > +
> > > + struct nvkm_memory *mthd;
> > > + struct nvkm_memory *inst;
> > > + struct nvkm_memory *user;
> > > + struct nvkm_memory *runl;
> > > +
> > > + struct nvkm_vmm *vmm;
> > > +};
> > > +
> > > +static int
> > > +ga102_chan_sclass(struct nvkm_object *object, int index, struct nvkm_oclass *oclass)
> > > +{
> > > + if (index == 0) {
> > > + oclass->ctor = nvkm_object_new;
> > > + oclass->base = (struct nvkm_sclass) { -1, -1, AMPERE_DMA_COPY_B };
> > > + return 0;
> > > + }
> > > +
> > > + return -EINVAL;
> > > +}
> > > +
> > > +static int
> > > +ga102_chan_map(struct nvkm_object *object, void *argv, u32 argc,
> > > + enum nvkm_object_map *type, u64 *addr, u64 *size)
> > > +{
> > > + struct ga102_chan *chan = ga102_chan(object);
> > > + struct nvkm_device *device = chan->object.engine->subdev.device;
> > > + u64 bar2 = nvkm_memory_bar2(chan->user);
> > > +
> > > + if (bar2 == ~0ULL)
> > > + return -EFAULT;
> > > +
> > > + *type = NVKM_OBJECT_MAP_IO;
> > > + *addr = device->func->resource_addr(device, 3) + bar2;
> > > + *size = 0x1000;
> > > + return 0;
> > > +}
> > > +
> > > +static int
> > > +ga102_chan_fini(struct nvkm_object *object, bool suspend)
> > > +{
> > > + struct ga102_chan *chan = ga102_chan(object);
> > > + struct nvkm_device *device = chan->object.engine->subdev.device;
> > > +
> > > + nvkm_wr32(device, chan->ctrl.chan, 0x00000003);
> > > +
> > > + nvkm_wr32(device, chan->ctrl.runl + 0x098, 0x01000000);
> > > + nvkm_msec(device, 2000,
> > > + if (!(nvkm_rd32(device, chan->ctrl.runl + 0x098) & 0x00100000))
> > > + break;
> > > + );
> > > +
> > > + nvkm_wr32(device, chan->ctrl.runl + 0x088, 0);
> > > +
> > > + nvkm_wr32(device, chan->ctrl.chan, 0xffffffff);
> > > + return 0;
> > > +}
> > > +
> > > +static int
> > > +ga102_chan_init(struct nvkm_object *object)
> > > +{
> > > + struct ga102_chan *chan = ga102_chan(object);
> > > + struct nvkm_device *device = chan->object.engine->subdev.device;
> > > +
> > > + nvkm_mask(device, chan->ctrl.runl + 0x300, 0x80000000, 0x80000000);
> > > +
> > > + nvkm_wr32(device, chan->ctrl.runl + 0x080, lower_32_bits(nvkm_memory_addr(chan->runl)));
> > > + nvkm_wr32(device, chan->ctrl.runl + 0x084, upper_32_bits(nvkm_memory_addr(chan->runl)));
> > > + nvkm_wr32(device, chan->ctrl.runl + 0x088, 2);
> > > +
> > > + nvkm_wr32(device, chan->ctrl.chan, 0x00000002);
> > > + nvkm_wr32(device, chan->ctrl.runl + 0x0090, 0);
> > > + return 0;
> > > +}
> > > +
> > > +static void *
> > > +ga102_chan_dtor(struct nvkm_object *object)
> > > +{
> > > + struct ga102_chan *chan = ga102_chan(object);
> > > +
> > > + if (chan->vmm) {
> > > + nvkm_vmm_part(chan->vmm, chan->inst);
> > > + nvkm_vmm_unref(&chan->vmm);
> > > + }
> > > +
> > > + nvkm_memory_unref(&chan->runl);
> > > + nvkm_memory_unref(&chan->user);
> > > + nvkm_memory_unref(&chan->inst);
> > > + nvkm_memory_unref(&chan->mthd);
> > > + return chan;
> > > +}
> > > +
> > > +static const struct nvkm_object_func
> > > +ga102_chan = {
> > > + .dtor = ga102_chan_dtor,
> > > + .init = ga102_chan_init,
> > > + .fini = ga102_chan_fini,
> > > + .map = ga102_chan_map,
> > > + .sclass = ga102_chan_sclass,
> > > +};
> > > +
> > > +static int
> > > +ga102_chan_new(struct nvkm_device *device,
> > > + const struct nvkm_oclass *oclass, void *argv, u32 argc, struct nvkm_object **pobject)
> > > +{
> > > + struct volta_channel_gpfifo_a_v0 *args = argv;
> > > + struct nvkm_top_device *tdev;
> > > + struct nvkm_vmm *vmm;
> > > + struct ga102_chan *chan;
> > > + int ret;
> > > +
> > > + if (argc != sizeof(*args))
> > > + return -ENOSYS;
> > > +
> > > + vmm = nvkm_uvmm_search(oclass->client, args->vmm);
> > > + if (IS_ERR(vmm))
> > > + return PTR_ERR(vmm);
> > > +
> > > + if (!(chan = kzalloc(sizeof(*chan), GFP_KERNEL)))
> > > + return -ENOMEM;
> > > +
> > > + nvkm_object_ctor(&ga102_chan, oclass, &chan->object);
> > > + *pobject = &chan->object;
> > > +
> > > + list_for_each_entry(tdev, &device->top->device, head) {
> > > + if (tdev->type == NVKM_ENGINE_CE) {
> > > + chan->ctrl.runl = tdev->runlist;
> > > + break;
> > > + }
> > > + }
> > > +
> > > + if (!chan->ctrl.runl)
> > > + return -ENODEV;
> > > +
> > > + chan->ctrl.chan = nvkm_rd32(device, chan->ctrl.runl + 0x004) & 0xfffffff0;
> > > + args->token = nvkm_rd32(device, chan->ctrl.runl + 0x008) & 0xffff0000;
> > > +
> > > + ret = nvkm_memory_new(device, NVKM_MEM_TARGET_INST, 0x1000, 0x1000, true, &chan->mthd);
> > > + if (ret)
> > > + return ret;
> > > +
> > > + ret = nvkm_memory_new(device, NVKM_MEM_TARGET_INST, 0x1000, 0x1000, true, &chan->inst);
> > > + if (ret)
> > > + return ret;
> > > +
> > > + nvkm_kmap(chan->inst);
> > > + nvkm_wo32(chan->inst, 0x010, 0x0000face);
> > > + nvkm_wo32(chan->inst, 0x030, 0x7ffff902);
> > > + nvkm_wo32(chan->inst, 0x048, lower_32_bits(args->ioffset));
> > > + nvkm_wo32(chan->inst, 0x04c, upper_32_bits(args->ioffset) |
> > > + (order_base_2(args->ilength) << 16));
> > > + nvkm_wo32(chan->inst, 0x084, 0x20400000);
> > > + nvkm_wo32(chan->inst, 0x094, 0x30000001);
> > > + nvkm_wo32(chan->inst, 0x0ac, 0x00020000);
> > > + nvkm_wo32(chan->inst, 0x0e4, 0x00000000);
> > > + nvkm_wo32(chan->inst, 0x0e8, 0);
> > > + nvkm_wo32(chan->inst, 0x0f4, 0x00001000);
> > > + nvkm_wo32(chan->inst, 0x0f8, 0x10003080);
> > > + nvkm_mo32(chan->inst, 0x218, 0x00000000, 0x00000000);
> > > + nvkm_wo32(chan->inst, 0x220, lower_32_bits(nvkm_memory_bar2(chan->mthd)));
> > > + nvkm_wo32(chan->inst, 0x224, upper_32_bits(nvkm_memory_bar2(chan->mthd)));
> > > + nvkm_done(chan->inst);
> > > +
> > > + ret = nvkm_memory_new(device, NVKM_MEM_TARGET_INST, 0x1000, 0x1000, true, &chan->user);
> > > + if (ret)
> > > + return ret;
> > > +
> > > + ret = nvkm_memory_new(device, NVKM_MEM_TARGET_INST, 0x1000, 0x1000, true, &chan->runl);
> > > + if (ret)
> > > + return ret;
> > > +
> > > + nvkm_kmap(chan->runl);
> > > + nvkm_wo32(chan->runl, 0x00, 0x80030001);
> > > + nvkm_wo32(chan->runl, 0x04, 1);
> > > + nvkm_wo32(chan->runl, 0x08, 0);
> > > + nvkm_wo32(chan->runl, 0x0c, 0x00000000);
> > > + nvkm_wo32(chan->runl, 0x10, lower_32_bits(nvkm_memory_addr(chan->user)));
> > > + nvkm_wo32(chan->runl, 0x14, upper_32_bits(nvkm_memory_addr(chan->user)));
> > > + nvkm_wo32(chan->runl, 0x18, lower_32_bits(nvkm_memory_addr(chan->inst)));
> > > + nvkm_wo32(chan->runl, 0x1c, upper_32_bits(nvkm_memory_addr(chan->inst)));
> > > + nvkm_done(chan->runl);
> >
> > Do we actually have documentation on what those offsets all mean?
> > (same for chan->inst above(
> Yes. The chan->inst stuff is NV_RAMFC (dev_ram.ref), and the copy
> engine context data. The chan->runl stuff is NV_RAMRL (also
> dev_ram.ref). It's actually almost identical to GV100, though RAMFC
> lost USERD fields, they're only specified in the RAMRL entry now. The
> code is shared in the full host implementation I'm trying to finish
> up.
>
oh wow, that file has actual documentation.
Cool, actually something to read through and understand :D Anyway, it
seems like it actually is just like the volta code, just with more
hard coded bits.
Overall I think the code is fine, so a
Reviewed-by: Karol Herbst <kherbst@xxxxxxxxxx>
I just don't know if I should feel comfortable getting into stable
kernels or not, but as it does "fixes" prime offloading, even though
it's more "enabling" than anything else. I think we might want to
either add such a workaround for future gens as well or try to
disallow setting up offloading? Not sure. If others are fine with it,
so am I :)
> >
> > > +
> > > + ret = nvkm_vmm_join(vmm, chan->inst);
> > > + if (ret)
> > > + return ret;
> > > +
> > > + chan->vmm = nvkm_vmm_ref(vmm);
> > > + return 0;
> > > +}
> > > +
> > > +static const struct nvkm_device_oclass
> > > +ga102_chan_oclass = {
> > > + .ctor = ga102_chan_new,
> > > +};
> > > +
> > > +static int
> > > +ga102_user_new(struct nvkm_device *device,
> > > + const struct nvkm_oclass *oclass, void *argv, u32 argc, struct nvkm_object **pobject)
> > > +{
> > > + return tu102_fifo_user_new(oclass, argv, argc, pobject);
> > > +}
> > > +
> > > +static const struct nvkm_device_oclass
> > > +ga102_user_oclass = {
> > > + .ctor = ga102_user_new,
> > > +};
> > > +
> > > +static int
> > > +ga102_fifo_sclass(struct nvkm_oclass *oclass, int index, const struct nvkm_device_oclass **class)
> > > +{
> > > + if (index == 0) {
> > > + oclass->base = (struct nvkm_sclass) { -1, -1, VOLTA_USERMODE_A };
> > > + *class = &ga102_user_oclass;
> > > + return 0;
> > > + } else
> > > + if (index == 1) {
> > > + oclass->base = (struct nvkm_sclass) { 0, 0, AMPERE_CHANNEL_GPFIFO_B };
> > > + *class = &ga102_chan_oclass;
> > > + return 0;
> > > + }
> > > +
> > > + return 2;
> > > +}
> > > +
> > > +static int
> > > +ga102_fifo_info(struct nvkm_engine *engine, u64 mthd, u64 *data)
> > > +{
> > > + switch (mthd) {
> > > + case NV_DEVICE_HOST_CHANNELS: *data = 1; return 0;
> > > + default:
> > > + break;
> > > + }
> > > +
> > > + return -ENOSYS;
> > > +}
> > > +
> > > +static void *
> > > +ga102_fifo_dtor(struct nvkm_engine *engine)
> > > +{
> > > + return ga102_fifo(engine);
> > > +}
> > > +
> > > +static const struct nvkm_engine_func
> > > +ga102_fifo = {
> > > + .dtor = ga102_fifo_dtor,
> > > + .info = ga102_fifo_info,
> > > + .base.sclass = ga102_fifo_sclass,
> > > +};
> > > +
> > > +int
> > > +ga102_fifo_new(struct nvkm_device *device, enum nvkm_subdev_type type, int inst,
> > > + struct nvkm_fifo **pfifo)
> > > +{
> > > + struct ga102_fifo *fifo;
> > > +
> > > + if (!(fifo = kzalloc(sizeof(*fifo), GFP_KERNEL)))
> > > + return -ENOMEM;
> > > +
> > > + nvkm_engine_ctor(&ga102_fifo, device, type, inst, true, &fifo->base.engine);
> > > + *pfifo = &fifo->base;
> > > + return 0;
> > > +}
> > > diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/top/ga100.c b/drivers/gpu/drm/nouveau/nvkm/subdev/top/ga100.c
> > > index 31933f3e5a07..c982d834c8d9 100644
> > > --- a/drivers/gpu/drm/nouveau/nvkm/subdev/top/ga100.c
> > > +++ b/drivers/gpu/drm/nouveau/nvkm/subdev/top/ga100.c
> > > @@ -54,7 +54,7 @@ ga100_top_oneinit(struct nvkm_top *top)
> > > info->reset = (data & 0x0000001f);
> > > break;
> > > case 2:
> > > - info->runlist = (data & 0x0000fc00) >> 10;
> > > + info->runlist = (data & 0x00fffc00);
> > > info->engine = (data & 0x00000003);
> > > break;
> > > default:
> > > @@ -85,9 +85,10 @@ ga100_top_oneinit(struct nvkm_top *top)
> > > }
> > >
> > > nvkm_debug(subdev, "%02x.%d (%8s): addr %06x fault %2d "
> > > - "runlist %2d engine %2d reset %2d\n", type, inst,
> > > + "runlist %6x engine %2d reset %2d\n", type, inst,
> > > info->type == NVKM_SUBDEV_NR ? "????????" : nvkm_subdev_type[info->type],
> > > - info->addr, info->fault, info->runlist, info->engine, info->reset);
> > > + info->addr, info->fault, info->runlist < 0 ? 0 : info->runlist,
> > > + info->engine, info->reset);
> > > info = NULL;
> > > }
> > >
> > > --
> > > 2.31.1
> > >
> >
> > Overall the changes look fine. I don't know if the ampere
> > implementation is itself correct, but the surrounding is fine imho.
> >
>
