gpu: nvgpu: Increase programmed ctagline at compr page boundaries

Increase the ctagline that is programmed in the page tables when the
buffer offset crosses the compression page boundaries. This fixes
compressible-kind fixed-address mapping with 4k pages when the GPU VA
is not aligned by the compression page size.

Bug 1995897
Bug 2011640
Bug 2011668

Change-Id: I1f1f9750635a20a916527c9d18fda7f8aa6b1b1f
Signed-off-by: Sami Kiminki <skiminki@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1608465
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

1 files changed, 8 insertions, 0 deletions

diff --git a/drivers/gpu/nvgpu/common/mm/gmmu.c b/drivers/gpu/nvgpu/common/mm/gmmu.c
index 8d78212b..62c84e96 100644
--- a/drivers/gpu/nvgpu/common/mm/gmmu.c
+++ b/drivers/gpu/nvgpu/common/mm/gmmu.c
@@ -691,6 +691,14 @@ u64 gk20a_locked_gmmu_map(struct vm_gk20a *vm,
                 .aperture  = aperture
         };
 
+        /*
+         * We need to add the buffer_offset within compression_page_size so that
+         * the programmed ctagline gets increased at compression_page_size
+         * boundaries.
+         */
+        if (attrs.ctag)
+                attrs.ctag += buffer_offset & (ctag_granularity - 1U);
+
 #ifdef CONFIG_TEGRA_19x_GPU
         nvgpu_gmmu_add_t19x_attrs(&attrs, flags);
 #endif