gpu: nvgpu: gv11b: add max_subctx_count to g->fifo.t19x

- For better performance. It used to read register every time referencing
  max_subctx_count.
- Avoid reading registers for vgpu.

Jira VFND-3797

Change-Id: Id6e6b15a0d9a035795e8a9a2c6bb63524c5eb544
Signed-off-by: Richard Zhao <rizhao@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1537009
Reviewed-by: svccoveritychecker <svccoveritychecker@nvidia.com>
Reviewed-by: Seshendra Gadagottu <sgadagottu@nvidia.com>
GVS: Gerrit_Virtual_Submit
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>

1 files changed, 6 insertions, 1 deletions

diff --git a/drivers/gpu/nvgpu/gv11b/fifo_gv11b.c b/drivers/gpu/nvgpu/gv11b/fifo_gv11b.c
index e210d40d..bd769f75 100644
--- a/drivers/gpu/nvgpu/gv11b/fifo_gv11b.c
+++ b/drivers/gpu/nvgpu/gv11b/fifo_gv11b.c
@@ -40,6 +40,7 @@
 #include <nvgpu/hw/gv11b/hw_top_gv11b.h>
 #include <nvgpu/hw/gv11b/hw_gmmu_gv11b.h>
 #include <nvgpu/hw/gv11b/hw_mc_gv11b.h>
+#include <nvgpu/hw/gv11b/hw_gr_gv11b.h>
 
 #include "fifo_gv11b.h"
 #include "subctx_gv11b.h"
@@ -1717,16 +1718,20 @@ int gv11b_init_fifo_setup_hw(struct gk20a *g)
         struct fifo_gk20a *f = &g->fifo;
 
         f->t19x.usermode_regs = g->regs + usermode_cfg0_r();
+        f->t19x.max_subctx_count =
+                gr_pri_fe_chip_def_info_max_veid_count_v(
+                        gk20a_readl(g, gr_pri_fe_chip_def_info_r()));
         return 0;
 }
 
 static u32 gv11b_mmu_fault_id_to_gr_veid(struct gk20a *g, u32 gr_eng_fault_id,
                                  u32 mmu_fault_id)
 {
+        struct fifo_gk20a *f = &g->fifo;
         u32 num_subctx;
         u32 veid = FIFO_INVAL_VEID;
 
-        num_subctx = gv11b_get_max_subctx_count(g);
+        num_subctx = f->t19x.max_subctx_count;
 
         if (mmu_fault_id >= gr_eng_fault_id &&
                         mmu_fault_id < (gr_eng_fault_id + num_subctx))