gpu: nvgpu: set graphics preemption state

Set NV_PGRAPH_PRI_FE_GFXP_WFI_TIMEOUT from the
default of ~20us to ~100us. Also set
NV_PGRAPH_DEBUG_2_GFXP_WFI_ALWAYS_INJECTS_WFI o
avoid going into GFXP all the time.

Bug 1593548
Jira VFND-1894

Change-Id: I6310c3605f7b83178c38de88788d87e36ee428b4
Signed-off-by: Thomas Fleury <tfleury@nvidia.com>
Reviewed-on: http://git-master/r/1162629
(cherry picked from commit 873ddc7288063b1773d31a5bda30d980122d6645)
Reviewed-on: http://git-master/r/1166988
GVS: Gerrit_Virtual_Submit
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>

1 files changed, 26 insertions, 0 deletions

diff --git a/drivers/gpu/nvgpu/gp10b/gr_gp10b.c b/drivers/gpu/nvgpu/gp10b/gr_gp10b.c
index 534ffdb7..88893886 100644
--- a/drivers/gpu/nvgpu/gp10b/gr_gp10b.c
+++ b/drivers/gpu/nvgpu/gp10b/gr_gp10b.c
@@ -14,6 +14,7 @@
  */
 
 #include "gk20a/gk20a.h" /* FERMI and MAXWELL classes defined here */
+#include <linux/clk.h>
 #include <linux/delay.h>
 #include <linux/tegra-fuse.h>
 
@@ -32,6 +33,8 @@
 #include "gp10b_sysfs.h"
 #include <linux/vmalloc.h>
 
+#define NVGPU_GFXP_WFI_TIMEOUT_US       100LL
+
 static bool gr_gp10b_is_valid_class(struct gk20a *g, u32 class_num)
 {
         bool valid = false;
@@ -2151,6 +2154,28 @@ static int gp10b_gr_fuse_override(struct gk20a *g)
         }
 
         kfree(fuses);
+
+        return 0;
+}
+
+static int gr_gp10b_init_preemption_state(struct gk20a *g)
+{
+        struct gk20a_platform *platform = gk20a_get_platform(g->dev);
+        u32 debug_2;
+        u64 sysclk_rate;
+        u32 sysclk_cycles;
+
+        sysclk_rate = platform->clk_get_rate(g->dev);
+        sysclk_cycles = (u32)((sysclk_rate * NVGPU_GFXP_WFI_TIMEOUT_US) / 1000000ULL);
+        gk20a_writel(g, gr_fe_gfxp_wfi_timeout_r(),
+                        gr_fe_gfxp_wfi_timeout_count_f(sysclk_cycles));
+
+        debug_2 = gk20a_readl(g, gr_debug_2_r());
+        debug_2 = set_field(debug_2,
+                        gr_debug_2_gfxp_wfi_always_injects_wfi_m(),
+                        gr_debug_2_gfxp_wfi_always_injects_wfi_enabled_f());
+        gk20a_writel(g, gr_debug_2_r(), debug_2);
+
         return 0;
 }
 
@@ -2158,6 +2183,7 @@ void gp10b_init_gr(struct gpu_ops *gops)
 {
         gm20b_init_gr(gops);
         gops->gr.init_fs_state = gr_gp10b_init_fs_state;
+        gops->gr.init_preemption_state = gr_gp10b_init_preemption_state;
         gops->gr.is_valid_class = gr_gp10b_is_valid_class;
         gops->gr.commit_global_cb_manager = gr_gp10b_commit_global_cb_manager;
         gops->gr.commit_global_pagepool = gr_gp10b_commit_global_pagepool;