[PATCH v8 27/31] gpu: nova-core: Hopper/Blackwell: larger WPR2 (GSP) heap

[John Hubbard <jhubbard@nvidia.com>]

Hopper, Blackwell and later GPUs require a larger heap for WPR2.

Signed-off-by: John Hubbard <jhubbard@nvidia.com>
---
 drivers/gpu/nova-core/gsp/fw.rs | 59 +++++++++++++++++++++++++--------
 1 file changed, 45 insertions(+), 14 deletions(-)

diff --git a/drivers/gpu/nova-core/gsp/fw.rs b/drivers/gpu/nova-core/gsp/fw.rs
index c510a9cea3ba..08d7d5406445 100644
--- a/drivers/gpu/nova-core/gsp/fw.rs
+++ b/drivers/gpu/nova-core/gsp/fw.rs
@@ -106,21 +106,39 @@ enum GspFwHeapParams {}
 /// Minimum required alignment for the GSP heap.
 const GSP_HEAP_ALIGNMENT: Alignment = Alignment::new::<{ 1 << 20 }>();
 
+// These constants override the generated bindings for architecture-specific heap sizing.
+// See Open RM: kgspCalculateGspFwHeapSize and related functions.
+//
+// 14MB for Hopper/Blackwell+.
+const GSP_FW_HEAP_PARAM_BASE_RM_SIZE_GH100: u64 = 14 * num::usize_as_u64(SZ_1M);
+// 142MB client alloc for ~188MB total.
+const GSP_FW_HEAP_PARAM_CLIENT_ALLOC_SIZE_GH100: u64 = 142 * num::usize_as_u64(SZ_1M);
+// Hopper/Blackwell+ minimum heap size: 170MB (88 + 12 + 70).
+// See Open RM: GSP_FW_HEAP_SIZE_OVERRIDE_LIBOS3_BAREMETAL_MIN_MB for the base 88MB,
+// plus Hopper+ additions in kgspCalculateGspFwHeapSize_GH100.
+const GSP_FW_HEAP_SIZE_OVERRIDE_LIBOS3_BAREMETAL_MIN_MB_HOPPER: u64 = 170;
+
 impl GspFwHeapParams {
     /// Returns the amount of GSP-RM heap memory used during GSP-RM boot and initialization (up to
     /// and including the first client subdevice allocation).
-    fn base_rm_size(_chipset: Chipset) -> u64 {
-        // TODO: this needs to be updated to return the correct value for Hopper+ once support for
-        // them is added:
-        // u64::from(bindings::GSP_FW_HEAP_PARAM_BASE_RM_SIZE_GH100)
-        u64::from(bindings::GSP_FW_HEAP_PARAM_BASE_RM_SIZE_TU10X)
+    fn base_rm_size(chipset: Chipset) -> u64 {
+        use crate::gpu::Architecture;
+        match chipset.arch() {
+            Architecture::Hopper | Architecture::Blackwell => GSP_FW_HEAP_PARAM_BASE_RM_SIZE_GH100,
+            _ => u64::from(bindings::GSP_FW_HEAP_PARAM_BASE_RM_SIZE_TU10X),
+        }
     }
 
     /// Returns the amount of heap memory required to support a single channel allocation.
-    fn client_alloc_size() -> u64 {
-        u64::from(bindings::GSP_FW_HEAP_PARAM_CLIENT_ALLOC_SIZE)
-            .align_up(GSP_HEAP_ALIGNMENT)
-            .unwrap_or(u64::MAX)
+    fn client_alloc_size(chipset: Chipset) -> Result<u64> {
+        use crate::gpu::Architecture;
+        let size = match chipset.arch() {
+            Architecture::Hopper | Architecture::Blackwell => {
+                GSP_FW_HEAP_PARAM_CLIENT_ALLOC_SIZE_GH100
+            }
+            _ => u64::from(bindings::GSP_FW_HEAP_PARAM_CLIENT_ALLOC_SIZE),
+        };
+        size.align_up(GSP_HEAP_ALIGNMENT).ok_or(EINVAL)
     }
 
     /// Returns the amount of memory to reserve for management purposes for a framebuffer of size
@@ -164,12 +182,25 @@ impl LibosParams {
                 * num::usize_as_u64(SZ_1M),
     };
 
+    /// Hopper/Blackwell+ GPUs need a larger minimum heap size than the bindings specify.
+    /// The r570 bindings set LIBOS3_BAREMETAL_MIN_MB to 88MB, but Hopper/Blackwell+ actually
+    /// requires 170MB (88 + 12 + 70).
+    const LIBOS_HOPPER: LibosParams = LibosParams {
+        carveout_size: num::u32_as_u64(bindings::GSP_FW_HEAP_PARAM_OS_SIZE_LIBOS3_BAREMETAL),
+        allowed_heap_size: GSP_FW_HEAP_SIZE_OVERRIDE_LIBOS3_BAREMETAL_MIN_MB_HOPPER
+            * num::usize_as_u64(SZ_1M)
+            ..num::u32_as_u64(bindings::GSP_FW_HEAP_SIZE_OVERRIDE_LIBOS3_BAREMETAL_MAX_MB)
+                * num::usize_as_u64(SZ_1M),
+    };
+
     /// Returns the libos parameters corresponding to `chipset`.
     pub(crate) fn from_chipset(chipset: Chipset) -> &'static LibosParams {
-        if chipset < Chipset::GA102 {
-            &Self::LIBOS2
-        } else {
-            &Self::LIBOS3
+        use crate::gpu::Architecture;
+        match chipset.arch() {
+            Architecture::Turing => &Self::LIBOS2,
+            Architecture::Ampere if chipset == Chipset::GA100 => &Self::LIBOS2,
+            Architecture::Ampere | Architecture::Ada => &Self::LIBOS3,
+            Architecture::Hopper | Architecture::Blackwell => &Self::LIBOS_HOPPER,
         }
     }
 
@@ -183,7 +214,7 @@ pub(crate) fn wpr_heap_size(&self, chipset: Chipset, fb_size: u64) -> Result<u64
             // RM boot working memory,
             .saturating_add(GspFwHeapParams::base_rm_size(chipset))
             // One RM client,
-            .saturating_add(GspFwHeapParams::client_alloc_size())
+            .saturating_add(GspFwHeapParams::client_alloc_size(chipset)?)
             // Overhead for memory management.
             .saturating_add(GspFwHeapParams::management_overhead(fb_size)?)
             // Clamp to the supported heap sizes.
-- 
2.53.0