gpu: nvgpu: Alignment check for compressible fixed-address mappings

Add an alignment check for compressible-kind fixed-address
mappings. If we're using page size smaller than the comptag line
coverage window, the GPU VA and the physical buffer offset must be
aligned in respect to that window.

Bug 1995897
Bug 2011640
Bug 2011668

Change-Id: If68043ee2828d54b9398d77553d10d35cc319236
Signed-off-by: Sami Kiminki <skiminki@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1606439
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/drivers/gpu/nvgpu/gm20b/fb_gm20b.c b/drivers/gpu/nvgpu/gm20b/fb_gm20b.c
index 1f8cc326..0157aa7a 100644
--- a/drivers/gpu/nvgpu/gm20b/fb_gm20b.c
+++ b/drivers/gpu/nvgpu/gm20b/fb_gm20b.c
@@ -70,6 +70,11 @@ unsigned int gm20b_fb_compressible_page_size(struct gk20a *g)
         return SZ_64K;
 }
 
+u32 gm20b_fb_compression_align_mask(struct gk20a *g)
+{
+        return SZ_64K - 1;
+}
+
 void gm20b_fb_dump_vpr_wpr_info(struct gk20a *g)
 {
         u32 val;