Various "reserved" areas of FB (frame buffer: vidmem) have to be
calculated, because the GSP booting process needs this information.

PMU_RESERVED_SIZE is computed at compile time using const_align_up().
The total reserved size is computed at runtime using Alignable::align_up
because it depends on the heap layout.

Cc: Timur Tabi <ttabi@nvidia.com>
Cc: Gary Guo <gary@garyguo.net>
Signed-off-by: John Hubbard <jhubbard@nvidia.com>
---
 drivers/gpu/nova-core/fb.rs     | 8 ++++++++
 drivers/gpu/nova-core/gsp/fw.rs | 6 +++++-
 2 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/nova-core/fb.rs b/drivers/gpu/nova-core/fb.rs
index 6536d0035cb1..ffb996b918f8 100644
--- a/drivers/gpu/nova-core/fb.rs
+++ b/drivers/gpu/nova-core/fb.rs
@@ -10,6 +10,7 @@
     fmt,
     prelude::*,
     ptr::{
+        const_align_up,
         Alignable,
         Alignment, //
     },
@@ -270,3 +271,10 @@ pub(crate) fn new(chipset: Chipset, bar: &Bar0, gsp_fw: &GspFirmware) -> Result<
         })
     }
 }
+
+/// PMU reserved size, aligned to 128KB.
+pub(crate) const PMU_RESERVED_SIZE: u32 =
+    match const_align_up(SZ_8M + SZ_16M + SZ_4K, Alignment::new::<SZ_128K>()) {
+        Some(v) => v as u32,
+        None => panic!("PMU_RESERVED_SIZE: alignment overflow"),
+    };
diff --git a/drivers/gpu/nova-core/gsp/fw.rs b/drivers/gpu/nova-core/gsp/fw.rs
index a061131b5412..92335e7fc34a 100644
--- a/drivers/gpu/nova-core/gsp/fw.rs
+++ b/drivers/gpu/nova-core/gsp/fw.rs
@@ -26,7 +26,10 @@
 };
 
 use crate::{
-    fb::FbLayout,
+    fb::{
+        FbLayout,
+        PMU_RESERVED_SIZE, //
+    },
     firmware::gsp::GspFirmware,
     gpu::Chipset,
     gsp::{
@@ -255,6 +258,7 @@ pub(crate) fn new(gsp_firmware: &GspFirmware, fb_layout: &FbLayout) -> Self {
             fbSize: fb_layout.fb.end - fb_layout.fb.start,
             vgaWorkspaceOffset: fb_layout.vga_workspace.start,
             vgaWorkspaceSize: fb_layout.vga_workspace.end - fb_layout.vga_workspace.start,
+            pmuReservedSize: PMU_RESERVED_SIZE,
             ..Default::default()
         })
     }
-- 
2.53.0