gpu: nvgpu: gk20a: add fecs error intr handler

Add handler gk20a_gr_handle_fecs_error() in case we have
pending fecs error interrupt
And clear this interrupt after handling.

Also, in gk20a_gr_handle_fecs_error(), for now just print
the contents of NV_PGRAPH_FECS_INTR and clear it

Bug 1495957

Change-Id: Ie7f70c84ec76ab698141646cd683584c4501e3e0
Signed-off-by: Deepak Nibade <dnibade@nvidia.com>
Reviewed-on: http://git-master/r/402874
(cherry picked from commit a29f219c57d65a06f6dae8086f19fa1af94d95bd)
Reviewed-on: http://git-master/r/403587
(cherry picked from commit e65ebebd0d4d5c3dbb6fa454dd51c383ea13d715)
Reviewed-on: http://git-master/r/411160
Reviewed-by: Automatic_Commit_Validation_User
GVS: Gerrit_Virtual_Submit
Reviewed-by: Sachin Nikam <snikam@nvidia.com>

1 files changed, 23 insertions, 0 deletions

diff --git a/drivers/gpu/nvgpu/gk20a/gr_gk20a.c b/drivers/gpu/nvgpu/gk20a/gr_gk20a.c
index 08309f0f..0cb6c933 100644
--- a/drivers/gpu/nvgpu/gk20a/gr_gk20a.c
+++ b/drivers/gpu/nvgpu/gk20a/gr_gk20a.c
@@ -4854,6 +4854,22 @@ static int gk20a_gr_handle_illegal_class(struct gk20a *g,
         return -EINVAL;
 }
 
+static int gk20a_gr_handle_fecs_error(struct gk20a *g,
+                                          struct gr_isr_data *isr_data)
+{
+        struct fifo_gk20a *f = &g->fifo;
+        struct channel_gk20a *ch = &f->channel[isr_data->chid];
+        u32 gr_fecs_intr = gk20a_readl(g, gr_fecs_intr_r());
+        gk20a_dbg_fn("");
+
+        gk20a_err(dev_from_gk20a(g),
+                   "unhandled fecs error interrupt 0x%08x for channel %u",
+                   gr_fecs_intr, ch->hw_chid);
+
+        gk20a_writel(g, gr_fecs_intr_r(), gr_fecs_intr);
+        return -EINVAL;
+}
+
 static int gk20a_gr_handle_class_error(struct gk20a *g,
                                           struct gr_isr_data *isr_data)
 {
@@ -5341,6 +5357,13 @@ int gk20a_gr_isr(struct gk20a *g)
                 gr_intr &= ~gr_intr_illegal_class_pending_f();
         }
 
+        if (gr_intr & gr_intr_fecs_error_pending_f()) {
+                need_reset |= gk20a_gr_handle_fecs_error(g, &isr_data);
+                gk20a_writel(g, gr_intr_r(),
+                        gr_intr_fecs_error_reset_f());
+                gr_intr &= ~gr_intr_fecs_error_pending_f();
+        }
+
         if (gr_intr & gr_intr_class_error_pending_f()) {
                 need_reset |= gk20a_gr_handle_class_error(g, &isr_data);
                 gk20a_writel(g, gr_intr_r(),