Having a RAM device does not make sense for chips like GK20A which have
no dedicated video memory. The dummy RAM device that we used so far
works as a temporary band-aid, but in the longer term it is desirable
for the driver to be able to work without any kind of VRAM.
This patch adds a few conditionals in places where a RAM device was
assumed to be present and allows some more objects to be allocated from
the TT domain, allowing Nouveau to handle GPUs for which
pfb->ram == NULL.
Signed-off-by: Alexandre Courbot <acourbot@xxxxxxxxxx>
---
drm/nouveau/nouveau_display.c | 9 ++++++++-
drm/nouveau/nouveau_ttm.c | 3 +++
drm/nouveau/nv84_fence.c | 14 +++++++++++---
drm/nouveau/nvkm/engine/device/base.c | 10 +++++++---
drm/nouveau/nvkm/subdev/clk/base.c | 2 +-
drm/nouveau/nvkm/subdev/fb/base.c | 26 ++++++++++++++++++--------
drm/nouveau/nvkm/subdev/ltc/gf100.c | 10 +++++++++-
7 files changed, 57 insertions(+), 17 deletions(-)
diff --git a/drm/nouveau/nouveau_display.c b/drm/nouveau/nouveau_display.c
index 860b0e2d4181..8670d90cdc11 100644
--- a/drm/nouveau/nouveau_display.c
+++ b/drm/nouveau/nouveau_display.c
@@ -869,13 +869,20 @@ nouveau_display_dumb_create(struct drm_file *file_priv, struct drm_device *dev,
struct drm_mode_create_dumb *args)
{
struct nouveau_bo *bo;
+ uint32_t domain;
int ret;
args->pitch = roundup(args->width * (args->bpp / 8), 256);
args->size = args->pitch * args->height;
args->size = roundup(args->size, PAGE_SIZE);
- ret = nouveau_gem_new(dev, args->size, 0, NOUVEAU_GEM_DOMAIN_VRAM, 0, 0, &bo);
+ /* Use VRAM if there is any ; otherwise fallback to system memory */
+ if (nouveau_drm(dev)->device.info.ram_size != 0)
+ domain = NOUVEAU_GEM_DOMAIN_VRAM;
+ else
+ domain = NOUVEAU_GEM_DOMAIN_GART;
+
+ ret = nouveau_gem_new(dev, args->size, 0, domain, 0, 0, &bo);
if (ret)
return ret;
diff --git a/drm/nouveau/nouveau_ttm.c b/drm/nouveau/nouveau_ttm.c
index 273e50110ec3..18f449715788 100644
--- a/drm/nouveau/nouveau_ttm.c
+++ b/drm/nouveau/nouveau_ttm.c
@@ -82,6 +82,9 @@ nouveau_vram_manager_new(struct ttm_mem_type_manager *man,
u32 size_nc = 0;
int ret;
+ if (drm->device.info.ram_size == 0)
+ return -ENOMEM;
+
if (nvbo->tile_flags & NOUVEAU_GEM_TILE_NONCONTIG)
size_nc = 1 << nvbo->page_shift;
diff --git a/drm/nouveau/nv84_fence.c b/drm/nouveau/nv84_fence.c
index bf429cabbaa8..a03db4368696 100644
--- a/drm/nouveau/nv84_fence.c
+++ b/drm/nouveau/nv84_fence.c
@@ -215,6 +215,7 @@ nv84_fence_create(struct nouveau_drm *drm)
{
struct nvkm_fifo *pfifo = nvxx_fifo(&drm->device);
struct nv84_fence_priv *priv;
+ u32 domain;
int ret;
priv = drm->fence = kzalloc(sizeof(*priv), GFP_KERNEL);
@@ -231,10 +232,17 @@ nv84_fence_create(struct nouveau_drm *drm)
priv->base.context_base = fence_context_alloc(priv->base.contexts);
priv->base.uevent = true;
- ret = nouveau_bo_new(drm->dev, 16 * priv->base.contexts, 0,
- TTM_PL_FLAG_VRAM, 0, 0, NULL, NULL, &priv->bo);
+ /* Use VRAM if there is any ; otherwise fallback to system memory */
+ domain = drm->device.info.ram_size != 0 ? TTM_PL_FLAG_VRAM :
+ /*
+ * fences created in sysmem must be non-cached or we
+ * will lose CPU/GPU coherency!
+ */
+ TTM_PL_FLAG_TT | TTM_PL_FLAG_UNCACHED;
+ ret = nouveau_bo_new(drm->dev, 16 * priv->base.contexts, 0, domain, 0,
+ 0, NULL, NULL, &priv->bo);
if (ret == 0) {
- ret = nouveau_bo_pin(priv->bo, TTM_PL_FLAG_VRAM, false);
+ ret = nouveau_bo_pin(priv->bo, domain, false);
if (ret == 0) {
ret = nouveau_bo_map(priv->bo);
if (ret)
diff --git a/drm/nouveau/nvkm/engine/device/base.c b/drm/nouveau/nvkm/engine/device/base.c
index 6efa8f38ff54..63d8e52f4b22 100644
--- a/drm/nouveau/nvkm/engine/device/base.c
+++ b/drm/nouveau/nvkm/engine/device/base.c
@@ -139,9 +139,13 @@ nvkm_devobj_info(struct nvkm_object *object, void *data, u32 size)
args->v0.chipset = device->chipset;
args->v0.revision = device->chiprev;
- if (pfb) args->v0.ram_size = args->v0.ram_user = pfb->ram->size;
- else args->v0.ram_size = args->v0.ram_user = 0;
- if (imem) args->v0.ram_user = args->v0.ram_user - imem->reserved;
+ if (pfb && pfb->ram)
+ args->v0.ram_size = args->v0.ram_user = pfb->ram->size;
+ else
+ args->v0.ram_size = args->v0.ram_user = 0;
+ if (imem && args->v0.ram_size > 0)
+ args->v0.ram_user = args->v0.ram_user - imem->reserved;
+
return 0;
}
diff --git a/drm/nouveau/nvkm/subdev/clk/base.c b/drm/nouveau/nvkm/subdev/clk/base.c
index b24a9cc04b73..39a83d82e0cd 100644
--- a/drm/nouveau/nvkm/subdev/clk/base.c
+++ b/drm/nouveau/nvkm/subdev/clk/base.c
@@ -184,7 +184,7 @@ nvkm_pstate_prog(struct nvkm_clk *clk, int pstatei)
nv_debug(clk, "setting performance state %d\n", pstatei);
clk->pstate = pstatei;
- if (pfb->ram->calc) {
+ if (pfb->ram && pfb->ram->calc) {
int khz = pstate->base.domain[nv_clk_src_mem];
do {
ret = pfb->ram->calc(pfb, khz);
diff --git a/drm/nouveau/nvkm/subdev/fb/base.c b/drm/nouveau/nvkm/subdev/fb/base.c
index 16589fa613cd..61fde43dab71 100644
--- a/drm/nouveau/nvkm/subdev/fb/base.c
+++ b/drm/nouveau/nvkm/subdev/fb/base.c
@@ -55,9 +55,11 @@ _nvkm_fb_fini(struct nvkm_object *object, bool suspend)
struct nvkm_fb *pfb = (void *)object;
int ret;
- ret = nv_ofuncs(pfb->ram)->fini(nv_object(pfb->ram), suspend);
- if (ret && suspend)
- return ret;
+ if (pfb->ram) {
+ ret = nv_ofuncs(pfb->ram)->fini(nv_object(pfb->ram), suspend);
+ if (ret && suspend)
+ return ret;
+ }
return nvkm_subdev_fini(&pfb->base, suspend);
}
@@ -72,9 +74,11 @@ _nvkm_fb_init(struct nvkm_object *object)
if (ret)
return ret;
- ret = nv_ofuncs(pfb->ram)->init(nv_object(pfb->ram));
- if (ret)
- return ret;
+ if (pfb->ram) {
+ ret = nv_ofuncs(pfb->ram)->init(nv_object(pfb->ram));
+ if (ret)
+ return ret;
+ }
for (i = 0; i < pfb->tile.regions; i++)
pfb->tile.prog(pfb, i, &pfb->tile.region[i]);
@@ -91,9 +95,12 @@ _nvkm_fb_dtor(struct nvkm_object *object)
for (i = 0; i < pfb->tile.regions; i++)
pfb->tile.fini(pfb, i, &pfb->tile.region[i]);
nvkm_mm_fini(&pfb->tags);
- nvkm_mm_fini(&pfb->vram);
- nvkm_object_ref(NULL, (struct nvkm_object **)&pfb->ram);
+ if (pfb->ram) {
+ nvkm_mm_fini(&pfb->vram);
+ nvkm_object_ref(NULL, (struct nvkm_object **)&pfb->ram);
+ }
+
nvkm_subdev_destroy(&pfb->base);
}
@@ -127,6 +134,9 @@ nvkm_fb_create_(struct nvkm_object *parent, struct nvkm_object *engine,
pfb->memtype_valid = impl->memtype;
+ if (!impl->ram)
+ return 0;
+
ret = nvkm_object_ctor(nv_object(pfb), NULL, impl->ram, NULL, 0, &ram);
if (ret) {
nv_fatal(pfb, "error detecting memory configuration!!\n");
diff --git a/drm/nouveau/nvkm/subdev/ltc/gf100.c b/drm/nouveau/nvkm/subdev/ltc/gf100.c
index 8e7cc6200d60..7fb5ea0314cb 100644
--- a/drm/nouveau/nvkm/subdev/ltc/gf100.c
+++ b/drm/nouveau/nvkm/subdev/ltc/gf100.c
@@ -136,7 +136,8 @@ gf100_ltc_dtor(struct nvkm_object *object)
struct nvkm_ltc_priv *priv = (void *)object;
nvkm_mm_fini(&priv->tags);
- nvkm_mm_free(&pfb->vram, &priv->tag_ram);
+ if (pfb->ram)
+ nvkm_mm_free(&pfb->vram, &priv->tag_ram);
nvkm_ltc_destroy(priv);
}
@@ -149,6 +150,12 @@ gf100_ltc_init_tag_ram(struct nvkm_fb *pfb, struct nvkm_ltc_priv *priv)
u32 tag_size, tag_margin, tag_align;
int ret;
+ /* No VRAM, no tags for now. */
+ if (!pfb->ram) {
+ priv->num_tags = 0;
+ goto mm_init;
+ }
+
/* tags for 1/4 of VRAM should be enough (8192/4 per GiB of VRAM) */
priv->num_tags = (pfb->ram->size >> 17) / 4;
if (priv->num_tags > (1 << 17))
@@ -183,6 +190,7 @@ gf100_ltc_init_tag_ram(struct nvkm_fb *pfb, struct nvkm_ltc_priv *priv)
priv->tag_base = tag_base;
}
+mm_init:
ret = nvkm_mm_init(&priv->tags, 0, priv->num_tags, 1);
return ret;
}
--
2.3.0
--
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