Some GPUs (e.g. GK20A, GM20B) do not embed VRAM of their own and use
the system memory as a backend instead. For such systems, allocating
objects in VRAM results in errors since the kernel will not allow
VRAM objects allocations.
This patch adds a vram_domain member to struct nouveau_screen that can
optionally be initialized to an alternative domain to use for VRAM
allocations. If left untouched, NOUVEAU_BO_VRAM will be used for
systems that embed VRAM, and NOUVEAU_BO_GART will be used for VRAM-less
systems.
Code that uses GPU objects is then expected to use the NV_VRAM_DOMAIN()
macro in place of NOUVEAU_BO_VRAM to ensure correct behavior on
VRAM-less chips.
Signed-off-by: Alexandre Courbot <acour...@nvidia.com>
---
src/gallium/drivers/nouveau/nouveau_screen.c | 10 ++++++++++
src/gallium/drivers/nouveau/nouveau_screen.h | 4 ++++
2 files changed, 14 insertions(+)
diff --git a/src/gallium/drivers/nouveau/nouveau_screen.c
b/src/gallium/drivers/nouveau/nouveau_screen.c
index b4f1413fd8ba..c6e5074db195 100644
--- a/src/gallium/drivers/nouveau/nouveau_screen.c
+++ b/src/gallium/drivers/nouveau/nouveau_screen.c
@@ -164,6 +164,16 @@ nouveau_screen_init(struct nouveau_screen *screen, struct
nouveau_device *dev)
size = sizeof(nvc0_data);
}
+ /*
+ * Set default VRAM domain if not overridden
+ */
+ if (!screen->vram_domain) {
+ if (dev->vram_size > 0)
+ screen->vram_domain = NOUVEAU_BO_VRAM;
+ else
+ screen->vram_domain = NOUVEAU_BO_GART;
+ }
+
ret = nouveau_object_new(&dev->object, 0, NOUVEAU_FIFO_CHANNEL_CLASS,
data, size, &screen->channel);
if (ret)
diff --git a/src/gallium/drivers/nouveau/nouveau_screen.h
b/src/gallium/drivers/nouveau/nouveau_screen.h
index cf06f7e88aa0..30041b271c94 100644
--- a/src/gallium/drivers/nouveau/nouveau_screen.h
+++ b/src/gallium/drivers/nouveau/nouveau_screen.h
@@ -51,6 +51,8 @@ struct nouveau_screen {
boolean hint_buf_keep_sysmem_copy;
+ unsigned vram_domain;
+
struct {
unsigned profiles_checked;
unsigned profiles_present;
@@ -94,6 +96,8 @@ struct nouveau_screen {
#endif
};
+#define NV_VRAM_DOMAIN(screen) ((screen)->vram_domain)
+
#ifdef NOUVEAU_ENABLE_DRIVER_STATISTICS
# define NOUVEAU_DRV_STAT(s, n, v) do { \
(s)->stats.named.n += (v); \
--
2.4.4
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