gpu: nvgpu: add supported preemptions to gpu characteristics

Add below flag fields to gpu characteristics to indicate
supported and default preemption modes on platform for
graphics and compute

__u32 graphics_preemption_mode_flags;
__u32 compute_preemption_mode_flags;
__u32 default_graphics_preempt_mode;
__u32 default_compute_preempt_mode;

Add struct nvgpu_preemption_modes_rec to struct gr_gk20a
to store these values locally

Use platform specific get_preemption_mode_flags() to
get the flags and define gk20a/gm20b specific
get_preemption_mode_flags() API

Bug 1646259

Change-Id: I80193c0d988dc93bd96585f9aa631fd817f4dfa3
Signed-off-by: Deepak Nibade <dnibade@nvidia.com>
Reviewed-on: http://git-master/r/1133595
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>
Tested-by: Terje Bergstrom <tbergstrom@nvidia.com>

1 files changed, 18 insertions, 0 deletions

diff --git a/drivers/gpu/nvgpu/gm20b/gr_gm20b.c b/drivers/gpu/nvgpu/gm20b/gr_gm20b.c
index dbe30f00..2a982f87 100644
--- a/drivers/gpu/nvgpu/gm20b/gr_gm20b.c
+++ b/drivers/gpu/nvgpu/gm20b/gr_gm20b.c
@@ -1345,6 +1345,23 @@ fail:
         return err;
 }
 
+static int gr_gm20b_get_preemption_mode_flags(struct gk20a *g,
+                struct nvgpu_preemption_modes_rec *preemption_modes_rec)
+{
+        preemption_modes_rec->graphics_preemption_mode_flags =
+                        NVGPU_GRAPHICS_PREEMPTION_MODE_WFI;
+        preemption_modes_rec->compute_preemption_mode_flags = (
+                        NVGPU_COMPUTE_PREEMPTION_MODE_WFI |
+                        NVGPU_COMPUTE_PREEMPTION_MODE_CTA);
+
+        preemption_modes_rec->default_graphics_preempt_mode =
+                        NVGPU_GRAPHICS_PREEMPTION_MODE_WFI;
+        preemption_modes_rec->default_compute_preempt_mode =
+                        NVGPU_COMPUTE_PREEMPTION_MODE_CTA;
+
+        return 0;
+}
+
 void gm20b_init_gr(struct gpu_ops *gops)
 {
         gops->gr.init_gpc_mmu = gr_gm20b_init_gpc_mmu;
@@ -1417,4 +1434,5 @@ void gm20b_init_gr(struct gpu_ops *gops)
         gops->gr.update_sm_error_state = gm20b_gr_update_sm_error_state;
         gops->gr.clear_sm_error_state = gm20b_gr_clear_sm_error_state;
         gops->gr.suspend_contexts = gr_gk20a_suspend_contexts;
+        gops->gr.get_preemption_mode_flags = gr_gm20b_get_preemption_mode_flags;
 }