diff options
| -rw-r--r-- | drivers/gpu/nvgpu/gk20a/gr_gk20a.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/gpu/nvgpu/gk20a/gr_gk20a.c b/drivers/gpu/nvgpu/gk20a/gr_gk20a.c index 491f55bff50a..e195b433f58f 100644 --- a/drivers/gpu/nvgpu/gk20a/gr_gk20a.c +++ b/drivers/gpu/nvgpu/gk20a/gr_gk20a.c @@ -5055,6 +5055,7 @@ static int gk20a_gr_handle_notify_pending(struct gk20a *g, /* Used by sw interrupt thread to translate current ctx to chid. * For performance, we don't want to go through 128 channels every time. + * curr_ctx should be the value read from gr_fecs_current_ctx_r(). * A small tlb is used here to cache translation */ static int gk20a_gr_get_chid_from_ctx(struct gk20a *g, u32 curr_ctx) { @@ -5063,6 +5064,13 @@ static int gk20a_gr_get_chid_from_ctx(struct gk20a *g, u32 curr_ctx) u32 chid = -1; u32 i; + /* when contexts are unloaded from GR, the valid bit is reset + * but the instance pointer information remains intact. So the + * valid bit must be checked to be absolutely certain that a + * valid context is currently resident. */ + if (!gr_fecs_current_ctx_valid_v(curr_ctx)) + return -1; + spin_lock(&gr->ch_tlb_lock); /* check cache first */ |