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drm/nvc0/vram: support non-uniform memory size per controller 

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
hifive-unleashed-5.1
Ben Skeggs 2011-06-24 12:47:46 +10:00
parent 3c23a7b8bc
commit aa6500964c
1 changed files with 43 additions and 5 deletions
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48
drivers/gpu/drm/nouveau/nvc0_vram.c
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@ -106,12 +106,50 @@ nvc0_vram_init(struct drm_device *dev)
struct nouveau_vram_engine *vram = &dev_priv->engine.vram;
const u32 rsvd_head = ( 256 * 1024) >> 12; /* vga memory */
const u32 rsvd_tail = (1024 * 1024) >> 12; /* vbios etc */
u32 length;
u32 parts = nv_rd32(dev, 0x121c74);
u32 bsize = nv_rd32(dev, 0x10f20c);
u32 offset, length;
bool uniform = true;
int ret, i;
dev_priv->vram_size = nv_rd32(dev, 0x10f20c) << 20;
dev_priv->vram_size *= nv_rd32(dev, 0x121c74);
NV_DEBUG(dev, "0x100800: 0x%08x\n", nv_rd32(dev, 0x100800));
NV_DEBUG(dev, "parts 0x%08x bcast_mem_amount 0x%08x\n", parts, bsize);
length = (dev_priv->vram_size >> 12) - rsvd_head - rsvd_tail;
/* read amount of vram attached to each memory controller */
for (i = 0; i < parts; i++) {
u32 psize = nv_rd32(dev, 0x11020c + (i * 0x1000));
if (psize != bsize) {
if (psize < bsize)
bsize = psize;
uniform = false;
}
return nouveau_mm_init(&vram->mm, rsvd_head, length, 1);
NV_DEBUG(dev, "%d: mem_amount 0x%08x\n", i, psize);
dev_priv->vram_size += (u64)psize << 20;
}
/* if all controllers have the same amount attached, there's no holes */
if (uniform) {
offset = rsvd_head;
length = (dev_priv->vram_size >> 12) - rsvd_head - rsvd_tail;
return nouveau_mm_init(&vram->mm, offset, length, 1);
}
/* otherwise, address lowest common amount from 0GiB */
ret = nouveau_mm_init(&vram->mm, rsvd_head, (bsize << 8) * parts, 1);
if (ret)
return ret;
/* and the rest starting from (8GiB + common_size) */
offset = (0x0200000000ULL >> 12) + (bsize << 8);
length = (dev_priv->vram_size >> 12) - (bsize << 8) - rsvd_tail;
ret = nouveau_mm_init(&vram->mm, offset, length, 0);
if (ret) {
nouveau_mm_fini(&vram->mm);
return ret;
}
return 0;
}