gpu: nvgpu: ioctl for flushing GPU L2

CUDA devtools need to be able to flush the GPU's cache
in a sideband fashion and so cannot use methods. This
change implements an nvgpu_gpu_ioctl to flush and
optionally invalidate the GPU's L2 cache and flush fb.

Change-Id: Ib06a0bc8d8880ffbfe4b056518cc3c3df0cc4988
Signed-off-by: sujeet baranwal <sbaranwal@nvidia.com>
Signed-off-by: Mayank Kaushik <mkaushik@nvidia.com>
Reviewed-on: http://git-master/r/671809
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>
Tested-by: Terje Bergstrom <tbergstrom@nvidia.com>

1 files changed, 4 insertions, 3 deletions

diff --git a/drivers/gpu/nvgpu/gk20a/dbg_gpu_gk20a.c b/drivers/gpu/nvgpu/gk20a/dbg_gpu_gk20a.c
index 5bee34fc..ffb52549 100644
--- a/drivers/gpu/nvgpu/gk20a/dbg_gpu_gk20a.c
+++ b/drivers/gpu/nvgpu/gk20a/dbg_gpu_gk20a.c
@@ -412,19 +412,16 @@ long gk20a_dbg_gpu_dev_ioctl(struct file *filp, unsigned int cmd,
         case NVGPU_DBG_GPU_IOCTL_BIND_CHANNEL:
                 err = dbg_bind_channel_gk20a(dbg_s,
                              (struct nvgpu_dbg_gpu_bind_channel_args *)buf);
-                gk20a_dbg(gpu_dbg_gpu_dbg, "ret=%d", err);
                 break;
 
         case NVGPU_DBG_GPU_IOCTL_REG_OPS:
                 err = nvgpu_ioctl_channel_reg_ops(dbg_s,
                            (struct nvgpu_dbg_gpu_exec_reg_ops_args *)buf);
-                gk20a_dbg(gpu_dbg_gpu_dbg, "ret=%d", err);
                 break;
 
         case NVGPU_DBG_GPU_IOCTL_POWERGATE:
                 err = nvgpu_ioctl_powergate_gk20a(dbg_s,
                            (struct nvgpu_dbg_gpu_powergate_args *)buf);
-                gk20a_dbg(gpu_dbg_gpu_dbg, "ret=%d", err);
                 break;
 
         case NVGPU_DBG_GPU_IOCTL_EVENTS_CTRL:
@@ -460,6 +457,8 @@ long gk20a_dbg_gpu_dev_ioctl(struct file *filp, unsigned int cmd,
                 break;
         }
 
+        gk20a_dbg(gpu_dbg_gpu_dbg, "ret=%d", err);
+
         if ((err == 0) && (_IOC_DIR(cmd) & _IOC_READ))
                 err = copy_to_user((void __user *)arg,
                                    buf, _IOC_SIZE(cmd));
@@ -741,6 +740,8 @@ static int nvgpu_dbg_gpu_ioctl_suspend_resume_sm(
         bool ch_is_curr_ctx;
         int err = 0, action = args->mode;
 
+        gk20a_dbg(gpu_dbg_fn | gpu_dbg_gpu_dbg, "action: %d", args->mode);
+
         mutex_lock(&g->dbg_sessions_lock);
 
         /* Suspend GPU context switching */