diff options
| author | Mayank Kaushik <mkaushik@nvidia.com> | 2014-09-04 18:35:25 -0700 |
|---|---|---|
| committer | Winnie Hsu <whsu@nvidia.com> | 2014-10-17 10:58:21 -0700 |
| commit | b0f8ceb708d56f0bb129c9f927cdbdec64f16789 (patch) | |
| tree | 2dbe39ef5afa79e796aeed7a6e1c2c91f4f00ac2 /drivers | |
| parent | 0f0a500c8528aa9432b1a00a3e148c6856d8eb0f (diff) | |
gpu: nvgpu: gk20a: check ctx valid bit
When determining the chid for the current context, first check
the ctx valid bit.
Bug 1485555
Change-Id: I6c3096d800a6cef38b656d525437a2c4f8b45774
Signed-off-by: Mayank Kaushik <mkaushik@nvidia.com>
Reviewed-on: http://git-master/r/496140
(cherry picked from commit 20a7a9635e9f969782da6695d99bc99c4ed8fa32)
Reviewed-on: http://git-master/r/555054
Reviewed-by: Automatic_Commit_Validation_User
GVS: Gerrit_Virtual_Submit
Reviewed-by: Winnie Hsu <whsu@nvidia.com>
Diffstat (limited to 'drivers')
| -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 */ |