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gpu: nvgpu: Fix TLB invalidate race

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TLB invalidate can have a race if several contexts use the same
address space. One thread starting an invalidate allows another
thread to submit before invalidate is completed.

Bug 1502332

Change-Id: I074ec493eac3b153c5f23d796a1dee1d8db24855
Signed-off-by: Terje Bergstrom <tbergstrom@nvidia.com>
Reviewed-on: http://git-master/r/407578
Reviewed-by: Riham Haidar <rhaidar@nvidia.com>
Tested-by: Riham Haidar <rhaidar@nvidia.com>
This commit is contained in:
Terje Bergstrom
2014-05-08 14:43:27 +03:00
committed by Dan Willemsen
parent 4ac110cb8a
commit c8a5d3f908
3 changed files with 9 additions and 17 deletions
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7
drivers/gpu/nvgpu/gk20a/channel_gk20a.c
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@@ -1575,13 +1575,6 @@ static int gk20a_submit_channel_gpfifo(struct channel_gk20a *c,
incr_cmd->gp_put = c->gpfifo.put;
}
/* Invalidate tlb if it's dirty... */
/* TBD: this should be done in the cmd stream, not with PRIs. */
/* We don't know what context is currently running... */
/* Note also: there can be more than one context associated with the */
/* address space (vm). */
gk20a_mm_tlb_invalidate(c->vm);
trace_gk20a_channel_submitted_gpfifo(c->g->dev->name,
c->hw_chid,
num_entries,