gpu: nvgpu: memory unlock HAL support

- Created "mem_unlock" HAL under fb to support memory
  unlock
- Called as part of gk20a_finalize_poweron() if memory unlock
  support needed by checking HAL
- Assigned "mem_unlock" HAL to NULL for chips which don't
  need memory unlocks.

Change-Id: I68d0910f15d293feaacfcbf6bd17ecccd3b5219d
Signed-off-by: Mahantesh Kumbar <mkumbar@nvidia.com>
(cherry picked from commit 586894eb84860bbbe4c75dae4715bdf27432a480)
Reviewed-on: https://git-master.nvidia.com/r/1564703
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

5 files changed, 12 insertions, 0 deletions

diff --git a/drivers/gpu/nvgpu/gk20a/gk20a.c b/drivers/gpu/nvgpu/gk20a/gk20a.c
index d203a335..2d09c0bb 100644
--- a/drivers/gpu/nvgpu/gk20a/gk20a.c
+++ b/drivers/gpu/nvgpu/gk20a/gk20a.c
@@ -192,6 +192,14 @@ int gk20a_finalize_poweron(struct gk20a *g)
                 }
         }
 
+        if (g->ops.fb.mem_unlock) {
+                err = g->ops.fb.mem_unlock(g);
+                if (err) {
+                        nvgpu_err(g, "failed to unlock memory");
+                        goto done;
+                }
+        }
+
         err = g->ops.fifo.reset_enable_hw(g);
 
         if (err) {
diff --git a/drivers/gpu/nvgpu/gk20a/gk20a.h b/drivers/gpu/nvgpu/gk20a/gk20a.h
index 3fcad1cf..c04c97ca 100644
--- a/drivers/gpu/nvgpu/gk20a/gk20a.h
+++ b/drivers/gpu/nvgpu/gk20a/gk20a.h
@@ -445,6 +445,7 @@ struct gpu_ops {
                 void (*set_debug_mode)(struct gk20a *g, bool enable);
                 void (*tlb_invalidate)(struct gk20a *g, struct nvgpu_mem *pdb);
                 void (*hub_isr)(struct gk20a *g);
+                int (*mem_unlock)(struct gk20a *g);
         } fb;
         struct {
                 void (*slcg_bus_load_gating_prod)(struct gk20a *g, bool prod);
diff --git a/drivers/gpu/nvgpu/gm20b/hal_gm20b.c b/drivers/gpu/nvgpu/gm20b/hal_gm20b.c
index e146d3ca..269fd7f1 100644
--- a/drivers/gpu/nvgpu/gm20b/hal_gm20b.c
+++ b/drivers/gpu/nvgpu/gm20b/hal_gm20b.c
@@ -308,6 +308,7 @@ static const struct gpu_ops gm20b_ops = {
                 .is_debug_mode_enabled = gm20b_fb_debug_mode_enabled,
                 .set_debug_mode = gm20b_fb_set_debug_mode,
                 .tlb_invalidate = gk20a_fb_tlb_invalidate,
+                .mem_unlock = NULL,
         },
         .clock_gating = {
                 .slcg_bus_load_gating_prod =
diff --git a/drivers/gpu/nvgpu/gp106/hal_gp106.c b/drivers/gpu/nvgpu/gp106/hal_gp106.c
index 54960b96..1246ee7f 100644
--- a/drivers/gpu/nvgpu/gp106/hal_gp106.c
+++ b/drivers/gpu/nvgpu/gp106/hal_gp106.c
@@ -373,6 +373,7 @@ static const struct gpu_ops gp106_ops = {
                 .is_debug_mode_enabled = gm20b_fb_debug_mode_enabled,
                 .set_debug_mode = gm20b_fb_set_debug_mode,
                 .tlb_invalidate = gk20a_fb_tlb_invalidate,
+                .mem_unlock = NULL,
         },
         .clock_gating = {
                 .slcg_bus_load_gating_prod =
diff --git a/drivers/gpu/nvgpu/gp10b/hal_gp10b.c b/drivers/gpu/nvgpu/gp10b/hal_gp10b.c
index b40ce4a1..b80722b8 100644
--- a/drivers/gpu/nvgpu/gp10b/hal_gp10b.c
+++ b/drivers/gpu/nvgpu/gp10b/hal_gp10b.c
@@ -327,6 +327,7 @@ static const struct gpu_ops gp10b_ops = {
                 .is_debug_mode_enabled = gm20b_fb_debug_mode_enabled,
                 .set_debug_mode = gm20b_fb_set_debug_mode,
                 .tlb_invalidate = gk20a_fb_tlb_invalidate,
+                .mem_unlock = NULL,
         },
         .clock_gating = {
                 .slcg_bus_load_gating_prod =