[PATCH v5 14/14] nova-core: gsp: Boot GSP

[Alistair Popple <apopple@nvidia.com>]

Boot the GSP to the RISC-V active state. Completing the boot requires
running the CPU sequencer which will be added in a future commit.

Signed-off-by: Alistair Popple <apopple@nvidia.com>
Reviewed-by: Lyude Paul <lyude@redhat.com>

---

Changes for v4:
 - Switch wait_on to read_poll_timeout

Changes for v3:
 - Fixed minor nit from John
 - Added booter load error thanks to Timur's suggestion

Changes for v2:
 - Rebased on Alex's latest tree
---
 drivers/gpu/nova-core/falcon.rs         |  2 -
 drivers/gpu/nova-core/firmware/riscv.rs |  3 +-
 drivers/gpu/nova-core/gsp/boot.rs       | 63 ++++++++++++++++++++++++-
 3 files changed, 63 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/nova-core/falcon.rs b/drivers/gpu/nova-core/falcon.rs
index c871fd061987..98ad75b93ea2 100644
--- a/drivers/gpu/nova-core/falcon.rs
+++ b/drivers/gpu/nova-core/falcon.rs
@@ -510,14 +510,12 @@ pub(crate) fn signature_reg_fuse_version(
     /// Check if the RISC-V core is active.
     ///
     /// Returns `true` if the RISC-V core is active, `false` otherwise.
-    #[expect(unused)]
     pub(crate) fn is_riscv_active(&self, bar: &Bar0) -> bool {
         let cpuctl = regs::NV_PRISCV_RISCV_CPUCTL::read(bar, &E::ID);
         cpuctl.active_stat()
     }
 
     /// Write the application version to the OS register.
-    #[expect(dead_code)]
     pub(crate) fn write_os_version(&self, bar: &Bar0, app_version: u32) {
         regs::NV_PFALCON_FALCON_OS::default()
             .set_value(app_version)
diff --git a/drivers/gpu/nova-core/firmware/riscv.rs b/drivers/gpu/nova-core/firmware/riscv.rs
index 115b5f5355a1..98be14263366 100644
--- a/drivers/gpu/nova-core/firmware/riscv.rs
+++ b/drivers/gpu/nova-core/firmware/riscv.rs
@@ -52,7 +52,6 @@ fn new(bin_fw: &BinFirmware<'_>) -> Result<Self> {
 }
 
 /// A parsed firmware for a RISC-V core, ready to be loaded and run.
-#[expect(unused)]
 pub(crate) struct RiscvFirmware {
     /// Offset at which the code starts in the firmware image.
     pub(crate) code_offset: u32,
@@ -61,7 +60,7 @@ pub(crate) struct RiscvFirmware {
     /// Offset at which the manifest starts in the firmware image.
     pub(crate) manifest_offset: u32,
     /// Application version.
-    app_version: u32,
+    pub app_version: u32,
     /// Device-mapped firmware image.
     pub ucode: DmaObject,
 }
diff --git a/drivers/gpu/nova-core/gsp/boot.rs b/drivers/gpu/nova-core/gsp/boot.rs
index 0b306313ec53..649c758eda70 100644
--- a/drivers/gpu/nova-core/gsp/boot.rs
+++ b/drivers/gpu/nova-core/gsp/boot.rs
@@ -3,8 +3,10 @@
 use kernel::device;
 use kernel::dma::CoherentAllocation;
 use kernel::dma_write;
+use kernel::io::poll::read_poll_timeout;
 use kernel::pci;
 use kernel::prelude::*;
+use kernel::time::Delta;
 
 use crate::driver::Bar0;
 use crate::falcon::{gsp::Gsp, sec2::Sec2, Falcon};
@@ -127,7 +129,7 @@ pub(crate) fn boot(
 
         Self::run_fwsec_frts(dev, gsp_falcon, bar, &bios, &fb_layout)?;
 
-        let _booter_loader = BooterFirmware::new(
+        let booter_loader = BooterFirmware::new(
             dev,
             BooterKind::Loader,
             chipset,
@@ -143,6 +145,65 @@ pub(crate) fn boot(
         set_system_info(&mut self.cmdq, pdev, bar)?;
         build_registry(&mut self.cmdq, bar)?;
 
+        gsp_falcon.reset(bar)?;
+        let libos_handle = self.libos.dma_handle();
+        let (mbox0, mbox1) = gsp_falcon.boot(
+            bar,
+            Some(libos_handle as u32),
+            Some((libos_handle >> 32) as u32),
+        )?;
+        dev_dbg!(
+            pdev.as_ref(),
+            "GSP MBOX0: {:#x}, MBOX1: {:#x}\n",
+            mbox0,
+            mbox1
+        );
+
+        dev_dbg!(
+            pdev.as_ref(),
+            "Using SEC2 to load and run the booter_load firmware...\n"
+        );
+
+        sec2_falcon.reset(bar)?;
+        sec2_falcon.dma_load(bar, &booter_loader)?;
+        let wpr_handle = wpr_meta.dma_handle();
+        let (mbox0, mbox1) = sec2_falcon.boot(
+            bar,
+            Some(wpr_handle as u32),
+            Some((wpr_handle >> 32) as u32),
+        )?;
+        dev_dbg!(
+            pdev.as_ref(),
+            "SEC2 MBOX0: {:#x}, MBOX1{:#x}\n",
+            mbox0,
+            mbox1
+        );
+
+        if mbox0 != 0 {
+            dev_err!(
+                pdev.as_ref(),
+                "Booter-load failed with error {:#x}\n",
+                mbox0
+            );
+            return Err(ENODEV);
+        }
+
+        gsp_falcon.write_os_version(bar, gsp_fw.bootloader.app_version);
+
+        // Poll for RISC-V to become active before running sequencer
+        read_poll_timeout(
+            || Ok(gsp_falcon.is_riscv_active(bar)),
+            |val: &bool| *val,
+            Delta::from_millis(10),
+            Delta::from_secs(5),
+        )?;
+
+        dev_dbg!(
+            pdev.as_ref(),
+            "RISC-V active? {}\n",
+            gsp_falcon.is_riscv_active(bar),
+        );
+
         Ok(())
     }
 }
-- 
2.50.1