gpu: nvgpu: Force the PMU VM to use 128K large pages (gm20b)

Add a WAR for gm20b that allows us to force the PMU VM to use
128K large pages. For some reason setting the small page size
to 64K breaks the PMU boot. Unclear why. Bug needs to be filed
and fixed. Once fixed this patch can and should be reverted.

Bug 200105199

Change-Id: I2b4c9e214e2a6dff33bea18bd2359c33364ba03f
Signed-off-by: Alex Waterman <alexw@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1782769
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/drivers/gpu/nvgpu/os/linux/driver_common.c b/drivers/gpu/nvgpu/os/linux/driver_common.c
index c651e394..f1eccd06 100644
--- a/drivers/gpu/nvgpu/os/linux/driver_common.c
+++ b/drivers/gpu/nvgpu/os/linux/driver_common.c
@@ -215,6 +215,8 @@ static void nvgpu_init_mm_vars(struct gk20a *g)
                             platform->unified_memory);
         __nvgpu_set_enabled(g, NVGPU_MM_UNIFY_ADDRESS_SPACES,
                             platform->unify_address_spaces);
+        __nvgpu_set_enabled(g, NVGPU_MM_FORCE_128K_PMU_VM,
+                            platform->force_128K_pmu_vm);
 
         nvgpu_mutex_init(&g->mm.tlb_lock);
         nvgpu_mutex_init(&g->mm.priv_lock);