gpu: nvgpu: vgpu: suspend/resume contexts

Add ability to suspend/resume contexts for a debug session
(NVGPU_DBG_GPU_IOCTL_SUSPEND_RESUME_CONTEXTS), in virtualized
case:
- added hal function to resume contexts.
- added vgpu support for suspend contexts, i.e. build a list
of channel ids, and send TEGRA_VGPU_CMD_SUSPEND_CONTEXTS
- added vgpu support for resume contexts, i.e. build a list
of channel ids, and send TEGRA_VGPU_CMD_RESUME_CONTEXTS

Bug 1791111

Change-Id: Icc1c00d94a94dab6384ac263fb811c00fa4b07bf
Signed-off-by: Thomas Fleury <tfleury@nvidia.com>
Reviewed-on: http://git-master/r/1294761
(cherry picked from commit d17a38eda312ffa92ce92e5bafc30727a8b76c4e)
Reviewed-on: http://git-master/r/1299059
Reviewed-by: Automatic_Commit_Validation_User
Reviewed-by: svccoveritychecker <svccoveritychecker@nvidia.com>
GVS: Gerrit_Virtual_Submit
Reviewed-by: Cory Perry <cperry@nvidia.com>
Tested-by: Cory Perry <cperry@nvidia.com>
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>

1 files changed, 5 insertions, 1 deletions

diff --git a/drivers/gpu/nvgpu/vgpu/fifo_vgpu.c b/drivers/gpu/nvgpu/vgpu/fifo_vgpu.c
index 027a92fc..0655ea15 100644
--- a/drivers/gpu/nvgpu/vgpu/fifo_vgpu.c
+++ b/drivers/gpu/nvgpu/vgpu/fifo_vgpu.c
@@ -405,6 +405,7 @@ int vgpu_init_fifo_support(struct gk20a *g)
 static int vgpu_fifo_preempt_channel(struct gk20a *g, u32 hw_chid)
 {
         struct fifo_gk20a *f = &g->fifo;
+        struct channel_gk20a *ch = &f->channel[hw_chid];
         struct tegra_vgpu_cmd_msg msg;
         struct tegra_vgpu_channel_config_params *p =
                         &msg.params.channel_config;
@@ -412,9 +413,12 @@ static int vgpu_fifo_preempt_channel(struct gk20a *g, u32 hw_chid)
 
         gk20a_dbg_fn("");
 
+        if (!atomic_read(&ch->bound))
+                return 0;
+
         msg.cmd = TEGRA_VGPU_CMD_CHANNEL_PREEMPT;
         msg.handle = vgpu_get_handle(g);
-        p->handle = f->channel[hw_chid].virt_ctx;
+        p->handle = ch->virt_ctx;
         err = vgpu_comm_sendrecv(&msg, sizeof(msg), sizeof(msg));
 
         if (err || msg.ret) {