gpu: nvgpu: Implement 64k large page support

Implement support for 64kB large page size. Add an API to create an
address space via IOCTL so that we can accept flags, and assign one
flag for enabling 64kB large page size.

Also adds APIs to set per-context large page size. This is possible
only on Maxwell, so return error if caller tries to set large page
size on Kepler.

Default large page size is still 128kB.

Change-Id: I20b51c8f6d4a984acae8411ace3de9000c78e82f
Signed-off-by: Terje Bergstrom <tbergstrom@nvidia.com>

1 files changed, 14 insertions, 0 deletions

diff --git a/drivers/gpu/nvgpu/gk20a/fb_gk20a.c b/drivers/gpu/nvgpu/gk20a/fb_gk20a.c
index 52f2db4d..d5b3fd87 100644
--- a/drivers/gpu/nvgpu/gk20a/fb_gk20a.c
+++ b/drivers/gpu/nvgpu/gk20a/fb_gk20a.c
@@ -18,6 +18,7 @@
 #include "gk20a.h"
 #include "kind_gk20a.h"
 #include "hw_mc_gk20a.h"
+#include "hw_fb_gk20a.h"
 
 static void fb_gk20a_reset(struct gk20a *g)
 {
@@ -29,9 +30,22 @@ static void fb_gk20a_reset(struct gk20a *g)
                         | mc_enable_hub_enabled_f());
 }
 
+static void gk20a_fb_set_mmu_page_size(struct gk20a *g)
+{
+        /* set large page size in fb */
+        u32 fb_mmu_ctrl = gk20a_readl(g, fb_mmu_ctrl_r());
+
+        fb_mmu_ctrl = (fb_mmu_ctrl &
+                       ~fb_mmu_ctrl_vm_pg_size_f(~0x0)) |
+                fb_mmu_ctrl_vm_pg_size_128kb_f();
+
+        gk20a_writel(g, fb_mmu_ctrl_r(), fb_mmu_ctrl);
+}
+
 void gk20a_init_fb(struct gpu_ops *gops)
 {
         gops->fb.reset = fb_gk20a_reset;
+        gops->fb.set_mmu_page_size = gk20a_fb_set_mmu_page_size;
         gk20a_init_uncompressed_kind_map();
         gk20a_init_kind_attr();
 }