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drm/nouveau/imem/nv50: prevent fast-path for mapped objects when BAR isn't ready

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Another piece of solving the "GP100 BAR2 VMM bootstrap" puzzle.

Without doing this, we'd attempt to write PDEs for the lower page table
levels through BAR2 before BAR2 access has been fully initialised.

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
This commit is contained in:
Ben Skeggs
2017-11-01 03:56:19 +10:00
parent dfcbd55068
commit 69b136f200
1 changed files with 5 additions and 3 deletions
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8
drivers/gpu/drm/nouveau/nvkm/subdev/instmem/nv50.c
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@@ -196,9 +196,11 @@ nv50_instobj_acquire(struct nvkm_memory *memory)
}
/* Attempt to get a direct CPU mapping of the object. */
if (!iobj->map && (vmm = nvkm_bar_bar2_vmm(imem->subdev.device)))
nv50_instobj_kmap(iobj, vmm);
map = iobj->map;
if ((vmm = nvkm_bar_bar2_vmm(imem->subdev.device))) {
if (!iobj->map)
nv50_instobj_kmap(iobj, vmm);
map = iobj->map;
}
if (!refcount_inc_not_zero(&iobj->maps)) {
if (map)