gpu: nvgpu: Add czf_bypass sysfs node for gp10b

This change adds a new sysfs node to allow configuring CZF_BYPASS, to
enable platforms with low context-switching latency requirements.

/sys/devices/17000000.gp10b/czf_bypass

Values:
0 - always
1 - lateZ (default)
2 - single pass
3 - never

The specified value will apply only to newly allocated contexts.

Bug 1914014

Change-Id: Ibb9a8e86089acaadaa7260b00eedec5c80762d6f
Signed-off-by: Peter Boonstoppel <pboonstoppel@nvidia.com>
Reviewed-on: http://git-master/r/1478567
(cherry picked from commit 3bc022cb385b53f698b04f218db535e8162e8c94)
Reviewed-on: http://git-master/r/1473820
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/drivers/gpu/nvgpu/gk20a/gk20a.h b/drivers/gpu/nvgpu/gk20a/gk20a.h
index c36049b9..b5d0572e 100644
--- a/drivers/gpu/nvgpu/gk20a/gk20a.h
+++ b/drivers/gpu/nvgpu/gk20a/gk20a.h
@@ -366,6 +366,8 @@ struct gpu_ops {
                 int (*resume_from_pause)(struct gk20a *g);
                 int (*clear_sm_errors)(struct gk20a *g);
                 u32 (*tpc_enabled_exceptions)(struct gk20a *g);
+                int (*set_czf_bypass)(struct gk20a *g,
+                                      struct channel_gk20a *ch);
         } gr;
         struct {
                 void (*init_hw)(struct gk20a *g);