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drm/nouveau: use dedicated channel for async moves on GT/GF chipsets.

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The moves themselves were generally async to graphics previously, with
the exception that if the "main" channel is used to synchronise a
page flip at the same time, it can end up blocked for a noticable amount
of time for large buffer moves.

Not really critical, and there's better ways of handling this, but they
are all rather invasive, so this is fine for now.

Based on a patch by Maarten Lankhorst addressing the same issue.

Reported-by: Maarten Lankhorst <maarten.lankhorst@canonical.com>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Acked-by: Maarten Lankhorst <maarten.lankhorst@canonical.com>
This commit is contained in:
Ben Skeggs 2013-07-09 14:20:15 +10:00
parent 06b237ef39
commit 00fc6f6f73
2 changed files with 15 additions and 3 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

6
drivers/gpu/drm/nouveau/nouveau_bo.c
View file

@ -581,7 +581,7 @@ nve0_bo_move_init(struct nouveau_channel *chan, u32 handle)
int ret = RING_SPACE(chan, 2);
if (ret == 0) {
BEGIN_NVC0(chan, NvSubCopy, 0x0000, 1);
OUT_RING (chan, handle);
OUT_RING (chan, handle & 0x0000ffff);
FIRE_RING (chan);
}
return ret;
@ -1017,7 +1017,7 @@ nouveau_bo_move_init(struct nouveau_drm *drm)
struct ttm_mem_reg *, struct ttm_mem_reg *);
int (*init)(struct nouveau_channel *, u32 handle);
} _methods[] = {
{ "COPY", 0, 0xa0b5, nve0_bo_move_copy, nve0_bo_move_init },
{ "COPY", 4, 0xa0b5, nve0_bo_move_copy, nve0_bo_move_init },
{ "GRCE", 0, 0xa0b5, nve0_bo_move_copy, nvc0_bo_move_init },
{ "COPY1", 5, 0x90b8, nvc0_bo_move_copy, nvc0_bo_move_init },
{ "COPY0", 4, 0x90b5, nvc0_bo_move_copy, nvc0_bo_move_init },
@ -1037,7 +1037,7 @@ nouveau_bo_move_init(struct nouveau_drm *drm)
struct nouveau_channel *chan;
u32 handle = (mthd->engine << 16) | mthd->oclass;
if (mthd->init == nve0_bo_move_init)
if (mthd->engine)
chan = drm->cechan;
else
chan = drm->channel;

12
drivers/gpu/drm/nouveau/nouveau_drm.c
View file

@ -192,6 +192,18 @@ nouveau_accel_init(struct nouveau_drm *drm)
arg0 = NVE0_CHANNEL_IND_ENGINE_GR;
arg1 = 1;
} else
if (device->chipset >= 0xa3 &&
device->chipset != 0xaa &&
device->chipset != 0xac) {
ret = nouveau_channel_new(drm, &drm->client, NVDRM_DEVICE,
NVDRM_CHAN + 1, NvDmaFB, NvDmaTT,
&drm->cechan);
if (ret)
NV_ERROR(drm, "failed to create ce channel, %d\n", ret);
arg0 = NvDmaFB;
arg1 = NvDmaTT;
} else {
arg0 = NvDmaFB;
arg1 = NvDmaTT;