gpu: nvgpu: Add interface for privileged channel allocation

Added interface for privileged channel allocation to excute
the privileged method  (ex. CE phys mode transfer).

JIRA DNVGPU-53

Change-Id: I07f9181720b14345cf5890919c2818dfcf505d86
Signed-off-by: Lakshmanan M <lm@nvidia.com>
Reviewed-on: http://git-master/r/1169315
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>
Tested-by: Terje Bergstrom <tbergstrom@nvidia.com>

1 files changed, 24 insertions, 3 deletions

diff --git a/drivers/gpu/nvgpu/gk20a/channel_gk20a.c b/drivers/gpu/nvgpu/gk20a/channel_gk20a.c
index 91e025e1..3f9b0432 100644
--- a/drivers/gpu/nvgpu/gk20a/channel_gk20a.c
+++ b/drivers/gpu/nvgpu/gk20a/channel_gk20a.c
@@ -244,6 +244,18 @@ u32 channel_gk20a_pbdma_acquire_val(struct channel_gk20a *c)
         return val;
 }
 
+void gk20a_channel_setup_ramfc_for_privileged_channel(struct channel_gk20a *c)
+{
+        struct gk20a *g = c->g;
+        struct mem_desc *mem = &c->inst_block;
+
+        gk20a_dbg_info("channel %d : set ramfc privileged_channel", c->hw_chid);
+
+        /* Enable HCE priv mode for phys mode transfer */
+        gk20a_mem_wr32(g, mem, ram_fc_hce_ctrl_w(),
+                pbdma_hce_ctrl_hce_priv_mode_yes_f());
+}
+
 int channel_gk20a_setup_ramfc(struct channel_gk20a *c,
                         u64 gpfifo_base, u32 gpfifo_entries, u32 flags)
 {
@@ -300,6 +312,9 @@ int channel_gk20a_setup_ramfc(struct channel_gk20a *c,
 
         gk20a_mem_wr32(g, mem, ram_fc_chid_w(), ram_fc_chid_id_f(c->hw_chid));
 
+        if (c->is_privileged_channel)
+                gk20a_channel_setup_ramfc_for_privileged_channel(c);
+
         return channel_gk20a_commit_userd(c);
 }
 
@@ -1093,7 +1108,7 @@ struct channel_gk20a *gk20a_open_new_channel_with_cb(struct gk20a *g,
                 void (*update_fn)(struct channel_gk20a *, void *),
                 void *update_fn_data)
 {
-        struct channel_gk20a *ch = gk20a_open_new_channel(g, -1);
+        struct channel_gk20a *ch = gk20a_open_new_channel(g, -1, false);
 
         if (ch) {
                 spin_lock(&ch->update_fn_lock);
@@ -1105,7 +1120,9 @@ struct channel_gk20a *gk20a_open_new_channel_with_cb(struct gk20a *g,
         return ch;
 }
 
-struct channel_gk20a *gk20a_open_new_channel(struct gk20a *g, s32 runlist_id)
+struct channel_gk20a *gk20a_open_new_channel(struct gk20a *g,
+                s32 runlist_id,
+                bool is_privileged_channel)
 {
         struct fifo_gk20a *f = &g->fifo;
         struct channel_gk20a *ch;
@@ -1132,6 +1149,9 @@ struct channel_gk20a *gk20a_open_new_channel(struct gk20a *g, s32 runlist_id)
         /* Runlist for the channel */
         ch->runlist_id = runlist_id;
 
+        /* Channel privilege level */
+        ch->is_privileged_channel = is_privileged_channel;
+
         if (g->ops.fifo.alloc_inst(g, ch)) {
                 ch->g = NULL;
                 free_channel(f, ch);
@@ -1198,7 +1218,8 @@ static int __gk20a_channel_open(struct gk20a *g, struct file *filp, s32 runlist_
                 gk20a_err(dev_from_gk20a(g), "failed to power on, %d", err);
                 return err;
         }
-        ch = gk20a_open_new_channel(g, runlist_id);
+        /* All the user space channel should be non privilege */
+        ch = gk20a_open_new_channel(g, runlist_id, false);
         gk20a_idle(g->dev);
         if (!ch) {
                 gk20a_err(dev_from_gk20a(g),