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Message-ID: <20260131005604.454172-18-jhubbard@nvidia.com>
Date: Fri, 30 Jan 2026 16:55:51 -0800
From: John Hubbard <jhubbard@...dia.com>
To: Danilo Krummrich <dakr@...nel.org>
Cc: Alexandre Courbot <acourbot@...dia.com>,
Joel Fernandes <joelagnelf@...dia.com>,
Timur Tabi <ttabi@...dia.com>,
Alistair Popple <apopple@...dia.com>,
Eliot Courtney <ecourtney@...dia.com>,
Zhi Wang <zhiw@...dia.com>,
David Airlie <airlied@...il.com>,
Simona Vetter <simona@...ll.ch>,
Bjorn Helgaas <bhelgaas@...gle.com>,
Miguel Ojeda <ojeda@...nel.org>,
Alex Gaynor <alex.gaynor@...il.com>,
Boqun Feng <boqun.feng@...il.com>,
Gary Guo <gary@...yguo.net>,
Björn Roy Baron <bjorn3_gh@...tonmail.com>,
Benno Lossin <lossin@...nel.org>,
Andreas Hindborg <a.hindborg@...nel.org>,
Alice Ryhl <aliceryhl@...gle.com>,
Trevor Gross <tmgross@...ch.edu>,
nouveau@...ts.freedesktop.org,
rust-for-linux@...r.kernel.org,
LKML <linux-kernel@...r.kernel.org>,
John Hubbard <jhubbard@...dia.com>
Subject: [PATCH v2 17/30] gpu: nova-core: Hopper/Blackwell: add FSP message infrastructure
Add the FSP messaging infrastructure needed for Chain of Trust
communication on Hopper/Blackwell GPUs.
Reviewed-by: Joel Fernandes <joelagnelf@...dia.com>
Signed-off-by: John Hubbard <jhubbard@...dia.com>
---
drivers/gpu/nova-core/falcon/fsp.rs | 79 ++++++++++++++++++++++++++++-
drivers/gpu/nova-core/regs.rs | 47 +++++++++++++++++
2 files changed, 124 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/nova-core/falcon/fsp.rs b/drivers/gpu/nova-core/falcon/fsp.rs
index 5152c2f1ed26..081b9fce9278 100644
--- a/drivers/gpu/nova-core/falcon/fsp.rs
+++ b/drivers/gpu/nova-core/falcon/fsp.rs
@@ -46,7 +46,6 @@ impl Falcon<Fsp> {
/// Writes `data` to FSP external memory at byte `offset` using Falcon PIO.
///
/// Returns `EINVAL` if offset or data length is not 4-byte aligned.
- #[expect(unused)]
pub(crate) fn write_emem(&self, bar: &Bar0, offset: u32, data: &[u8]) -> Result {
// TODO: replace with `is_multiple_of` once the MSRV is >= 1.82.
if offset % 4 != 0 || data.len() % 4 != 0 {
@@ -70,7 +69,6 @@ pub(crate) fn write_emem(&self, bar: &Bar0, offset: u32, data: &[u8]) -> Result
/// Reads FSP external memory at byte `offset` into `data` using Falcon PIO.
///
/// Returns `EINVAL` if offset or data length is not 4-byte aligned.
- #[expect(unused)]
pub(crate) fn read_emem(&self, bar: &Bar0, offset: u32, data: &mut [u8]) -> Result {
// TODO: replace with `is_multiple_of` once the MSRV is >= 1.82.
if offset % 4 != 0 || data.len() % 4 != 0 {
@@ -88,4 +86,81 @@ pub(crate) fn read_emem(&self, bar: &Bar0, offset: u32, data: &mut [u8]) -> Resu
Ok(())
}
+
+ /// Poll FSP for incoming data.
+ ///
+ /// Returns the size of available data in bytes, or 0 if no data is available.
+ ///
+ /// The FSP message queue is not circular - pointers are reset to 0 after each
+ /// message exchange, so `tail >= head` is always true when data is present.
+ #[expect(unused)]
+ pub(crate) fn poll_msgq(&self, bar: &Bar0) -> u32 {
+ let head = regs::NV_PFSP_MSGQ_HEAD::read(bar).address();
+ let tail = regs::NV_PFSP_MSGQ_TAIL::read(bar).address();
+
+ if head == tail {
+ return 0;
+ }
+
+ // TAIL points at last DWORD written, so add 4 to get total size
+ tail.saturating_sub(head) + 4
+ }
+
+ /// Send message to FSP.
+ ///
+ /// Writes a message to FSP EMEM and updates queue pointers to notify FSP.
+ ///
+ /// # Arguments
+ /// * `bar` - BAR0 memory mapping
+ /// * `packet` - Message data (must be 4-byte aligned in length)
+ ///
+ /// # Returns
+ /// `Ok(())` on success, `Err(EINVAL)` if packet is empty or not 4-byte aligned
+ #[expect(unused)]
+ pub(crate) fn send_msg(&self, bar: &Bar0, packet: &[u8]) -> Result {
+ if packet.is_empty() {
+ return Err(EINVAL);
+ }
+
+ // Write message to EMEM at offset 0 (validates 4-byte alignment)
+ self.write_emem(bar, 0, packet)?;
+
+ // Update queue pointers - TAIL points at last DWORD written
+ let tail_offset = u32::try_from(packet.len() - 4).map_err(|_| EINVAL)?;
+ regs::NV_PFSP_QUEUE_TAIL::default()
+ .set_address(tail_offset)
+ .write(bar);
+ regs::NV_PFSP_QUEUE_HEAD::default()
+ .set_address(0)
+ .write(bar);
+
+ Ok(())
+ }
+
+ /// Receive message from FSP.
+ ///
+ /// Reads a message from FSP EMEM and resets queue pointers.
+ ///
+ /// # Arguments
+ /// * `bar` - BAR0 memory mapping
+ /// * `buffer` - Buffer to receive message data
+ /// * `size` - Size of message to read in bytes (from `poll_msgq`)
+ ///
+ /// # Returns
+ /// `Ok(bytes_read)` on success, `Err(EINVAL)` if size is 0, exceeds buffer, or not aligned
+ #[expect(unused)]
+ pub(crate) fn recv_msg(&self, bar: &Bar0, buffer: &mut [u8], size: usize) -> Result<usize> {
+ if size == 0 || size > buffer.len() {
+ return Err(EINVAL);
+ }
+
+ // Read response from EMEM at offset 0 (validates 4-byte alignment)
+ self.read_emem(bar, 0, &mut buffer[..size])?;
+
+ // Reset message queue pointers after reading
+ regs::NV_PFSP_MSGQ_TAIL::default().set_address(0).write(bar);
+ regs::NV_PFSP_MSGQ_HEAD::default().set_address(0).write(bar);
+
+ Ok(size)
+ }
}
diff --git a/drivers/gpu/nova-core/regs.rs b/drivers/gpu/nova-core/regs.rs
index 30a5a49edeab..861dbde5a0ac 100644
--- a/drivers/gpu/nova-core/regs.rs
+++ b/drivers/gpu/nova-core/regs.rs
@@ -441,6 +441,53 @@ pub(crate) fn reset_engine<E: FalconEngine>(bar: &Bar0) {
31:0 data as u32; // EMEM data register
});
+// FSP (Firmware System Processor) queue registers for Hopper/Blackwell Chain of Trust
+// These registers manage falcon EMEM communication queues
+register!(NV_PFSP_QUEUE_HEAD @ 0x008f2c00 {
+ 31:0 address as u32;
+});
+
+register!(NV_PFSP_QUEUE_TAIL @ 0x008f2c04 {
+ 31:0 address as u32;
+});
+
+register!(NV_PFSP_MSGQ_HEAD @ 0x008f2c80 {
+ 31:0 address as u32;
+});
+
+register!(NV_PFSP_MSGQ_TAIL @ 0x008f2c84 {
+ 31:0 address as u32;
+});
+
+// PTHERM registers
+
+// FSP secure boot completion status register used by FSP to signal boot completion.
+// This is the NV_THERM_I2CS_SCRATCH register.
+// Different architectures use different addresses:
+// - Hopper (GH100): 0x000200bc
+// - Blackwell (GB202): 0x00ad00bc
+pub(crate) fn fsp_thermal_scratch_reg_addr(arch: Architecture) -> Result<usize> {
+ match arch {
+ Architecture::Hopper => Ok(0x000200bc),
+ Architecture::Blackwell => Ok(0x00ad00bc),
+ _ => Err(kernel::error::code::ENOTSUPP),
+ }
+}
+
+/// FSP writes this value to indicate successful boot completion.
+#[expect(unused)]
+pub(crate) const FSP_BOOT_COMPLETE_SUCCESS: u32 = 0xff;
+
+// Helper function to read FSP boot completion status from the correct register
+#[expect(unused)]
+pub(crate) fn read_fsp_boot_complete_status(
+ bar: &crate::driver::Bar0,
+ arch: Architecture,
+) -> Result<u32> {
+ let addr = fsp_thermal_scratch_reg_addr(arch)?;
+ Ok(bar.read32(addr))
+}
+
// The modules below provide registers that are not identical on all supported chips. They should
// only be used in HAL modules.
--
2.52.0
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