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gpu: nvgpu: get VM reference for TSG

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We store a reference to common address space of channels
in struct tsg_gk20a without increasing the refcount

This could result in freeing the address space even when
some channel in TSG needs it or when we need to free
common gr_ctx

Fix this by getting ref using gk20a_vm_get() when we store
the VM reference. We drop this reference with
gk20a_vm_put() when closing the TSG

Bug 1470692

Change-Id: Ifc1f29d32cd721810bfbb5a4db96095770318c17
Signed-off-by: Deepak Nibade <dnibade@nvidia.com>
Reviewed-on: http://git-master/r/495668
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>
Tested-by: Terje Bergstrom <tbergstrom@nvidia.com>
This commit is contained in:
Deepak Nibade
2014-09-04 19:32:00 +05:30
committed by Dan Willemsen
parent b81e9a2431
commit 8095b3cf9c
2 changed files with 6 additions and 1 deletions
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3
drivers/gpu/nvgpu/gk20a/gr_gk20a.c
View File

@@ -2830,10 +2830,13 @@ int gk20a_alloc_obj_ctx(struct channel_gk20a *c,
} else {
if (!tsg->tsg_gr_ctx) {
tsg->vm = c->vm;
gk20a_vm_get(tsg->vm);
err = gr_gk20a_alloc_tsg_gr_ctx(g, tsg);
if (err) {
gk20a_err(dev_from_gk20a(g),
"fail to allocate TSG gr ctx buffer");
gk20a_vm_put(tsg->vm);
tsg->vm = NULL;
goto out;
}
}

4
drivers/gpu/nvgpu/gk20a/tsg_gk20a.c
View File

@@ -161,8 +161,10 @@ static void gk20a_tsg_release(struct kref *ref)
gr_gk20a_free_tsg_gr_ctx(tsg);
tsg->tsg_gr_ctx = NULL;
}
if (tsg->vm)
if (tsg->vm) {
gk20a_vm_put(tsg->vm);
tsg->vm = NULL;
}
release_used_tsg(&g->fifo, tsg);