From: Alistair Popple <apopple@nvidia.com>
After GSP initialization is complete, retrieve the static configuration
information from GSP-RM. This information includes GPU name, capabilities,
memory configuration, and other properties. On some GPU variants, it is
also required to do this for initialization to complete.
Signed-off-by: Alistair Popple <apopple@nvidia.com>
Co-developed-by: Joel Fernandes <joelagnelf@nvidia.com>
Signed-off-by: Joel Fernandes <joelagnelf@nvidia.com>
---
drivers/gpu/nova-core/gsp/boot.rs | 7 +
drivers/gpu/nova-core/gsp/commands.rs | 65 +++++++
drivers/gpu/nova-core/gsp/fw.rs | 5 +
.../gpu/nova-core/gsp/fw/r570_144/bindings.rs | 163 ++++++++++++++++++
drivers/gpu/nova-core/nova_core.rs | 1 +
drivers/gpu/nova-core/util.rs | 16 ++
6 files changed, 257 insertions(+)
create mode 100644 drivers/gpu/nova-core/util.rs
diff --git a/drivers/gpu/nova-core/gsp/boot.rs b/drivers/gpu/nova-core/gsp/boot.rs
index c0afafbf35f6..42a3abb9243d 100644
--- a/drivers/gpu/nova-core/gsp/boot.rs
+++ b/drivers/gpu/nova-core/gsp/boot.rs
@@ -40,6 +40,7 @@
GspFwWprMeta, //
},
regs,
+ util, //
vbios::Vbios,
};
@@ -237,6 +238,12 @@ pub(crate) fn boot(
GspSequencer::run(&mut self.cmdq, seq_params, Delta::from_secs(10))?;
commands::gsp_init_done(&mut self.cmdq, Delta::from_secs(10))?;
+ let info = commands::get_gsp_info(&mut self.cmdq, bar)?;
+ dev_info!(
+ pdev.as_ref(),
+ "GPU name: {}\n",
+ util::str_from_null_terminated(&info.gpu_name)
+ );
Ok(())
}
diff --git a/drivers/gpu/nova-core/gsp/commands.rs b/drivers/gpu/nova-core/gsp/commands.rs
index 07abfb54f9d7..6cb32e7d3436 100644
--- a/drivers/gpu/nova-core/gsp/commands.rs
+++ b/drivers/gpu/nova-core/gsp/commands.rs
@@ -17,6 +17,7 @@
};
use crate::{
+ driver::Bar0,
gsp::{
cmdq::{
Cmdq,
@@ -25,12 +26,25 @@
},
fw::{
commands::*,
+ GspStaticConfigInfo_t,
MsgFunction, //
},
},
sbuffer::SBufferIter,
+ util,
};
+// SAFETY: Padding is explicit and will not contain uninitialized data.
+unsafe impl AsBytes for GspStaticConfigInfo_t {}
+
+// SAFETY: This struct only contains integer types for which all bit patterns
+// are valid.
+unsafe impl FromBytes for GspStaticConfigInfo_t {}
+
+pub(crate) struct GspStaticConfigInfo {
+ pub gpu_name: [u8; 40],
+}
+
/// Message type for GSP initialization done notification.
struct GspInitDone {}
@@ -62,6 +76,57 @@ pub(crate) fn gsp_init_done(cmdq: &mut Cmdq, timeout: Delta) -> Result {
}
}
+impl MessageFromGsp for GspStaticConfigInfo {
+ const FUNCTION: MsgFunction = MsgFunction::GetGspStaticInfo;
+ type InitError = Infallible;
+ type Message = GspStaticConfigInfo_t;
+
+ fn read(
+ msg: &Self::Message,
+ _sbuffer: &mut SBufferIter<array::IntoIter<&[u8], 2>>,
+ ) -> Result<Self, Self::InitError> {
+ let gpu_name_str = util::str_from_null_terminated(&msg.gpuNameString);
+
+ let mut gpu_name = [0u8; 40];
+ let bytes = gpu_name_str.as_bytes();
+ let copy_len = core::cmp::min(bytes.len(), gpu_name.len());
+ gpu_name[..copy_len].copy_from_slice(&bytes[..copy_len]);
+ gpu_name[copy_len] = b'\0';
+
+ Ok(GspStaticConfigInfo { gpu_name })
+ }
+}
+
+// SAFETY: This struct only contains integer types and fixed-size arrays for which
+// all bit patterns are valid.
+unsafe impl Zeroable for GspStaticConfigInfo_t {}
+
+struct GetGspInfo;
+
+impl CommandToGsp for GetGspInfo {
+ const FUNCTION: MsgFunction = MsgFunction::GetGspStaticInfo;
+ type Command = GspStaticConfigInfo_t;
+ type InitError = Infallible;
+
+ fn init(&self) -> impl Init<Self::Command, Self::InitError> {
+ init!(GspStaticConfigInfo_t {
+ ..Zeroable::init_zeroed()
+ })
+ }
+}
+
+pub(crate) fn get_gsp_info(cmdq: &mut Cmdq, bar: &Bar0) -> Result<GspStaticConfigInfo> {
+ cmdq.send_command(bar, GetGspInfo)?;
+
+ loop {
+ match cmdq.receive_msg::<GspStaticConfigInfo>(Delta::from_secs(5)) {
+ Ok(info) => return Ok(info),
+ Err(ERANGE) => continue,
+ Err(e) => return Err(e),
+ }
+ }
+}
+
/// The `GspSetSystemInfo` command.
pub(crate) struct SetSystemInfo<'a> {
pdev: &'a pci::Device<device::Bound>,
diff --git a/drivers/gpu/nova-core/gsp/fw.rs b/drivers/gpu/nova-core/gsp/fw.rs
index 0cce54310c35..5b6a906ff5dc 100644
--- a/drivers/gpu/nova-core/gsp/fw.rs
+++ b/drivers/gpu/nova-core/gsp/fw.rs
@@ -882,6 +882,11 @@ pub(crate) fn element_count(&self) -> u32 {
}
}
+pub(crate) use r570_144::{
+ // GSP static configuration information.
+ GspStaticConfigInfo_t, //
+};
+
// SAFETY: Padding is explicit and will not contain uninitialized data.
unsafe impl AsBytes for GspMsgElement {}
diff --git a/drivers/gpu/nova-core/gsp/fw/r570_144/bindings.rs b/drivers/gpu/nova-core/gsp/fw/r570_144/bindings.rs
index c5c589c1e2ac..f081ac1708e6 100644
--- a/drivers/gpu/nova-core/gsp/fw/r570_144/bindings.rs
+++ b/drivers/gpu/nova-core/gsp/fw/r570_144/bindings.rs
@@ -320,6 +320,77 @@ fn fmt(&self, fmt: &mut ::core::fmt::Formatter<'_>) -> ::core::fmt::Result {
pub const NV_VGPU_MSG_EVENT_NUM_EVENTS: _bindgen_ty_3 = 4131;
pub type _bindgen_ty_3 = ffi::c_uint;
#[repr(C)]
+#[derive(Debug, Default, Copy, Clone)]
+pub struct NV0080_CTRL_GPU_GET_SRIOV_CAPS_PARAMS {
+ pub totalVFs: u32_,
+ pub firstVfOffset: u32_,
+ pub vfFeatureMask: u32_,
+ pub FirstVFBar0Address: u64_,
+ pub FirstVFBar1Address: u64_,
+ pub FirstVFBar2Address: u64_,
+ pub bar0Size: u64_,
+ pub bar1Size: u64_,
+ pub bar2Size: u64_,
+ pub b64bitBar0: u8_,
+ pub b64bitBar1: u8_,
+ pub b64bitBar2: u8_,
+ pub bSriovEnabled: u8_,
+ pub bSriovHeavyEnabled: u8_,
+ pub bEmulateVFBar0TlbInvalidationRegister: u8_,
+ pub bClientRmAllocatedCtxBuffer: u8_,
+ pub bNonPowerOf2ChannelCountSupported: u8_,
+ pub bVfResizableBAR1Supported: u8_,
+}
+#[repr(C)]
+#[derive(Debug, Default, Copy, Clone)]
+pub struct NV2080_CTRL_BIOS_GET_SKU_INFO_PARAMS {
+ pub BoardID: u32_,
+ pub chipSKU: [ffi::c_char; 9usize],
+ pub chipSKUMod: [ffi::c_char; 5usize],
+ pub skuConfigVersion: u32_,
+ pub project: [ffi::c_char; 5usize],
+ pub projectSKU: [ffi::c_char; 5usize],
+ pub CDP: [ffi::c_char; 6usize],
+ pub projectSKUMod: [ffi::c_char; 2usize],
+ pub businessCycle: u32_,
+}
+pub type NV2080_CTRL_CMD_FB_GET_FB_REGION_SURFACE_MEM_TYPE_FLAG = [u8_; 17usize];
+#[repr(C)]
+#[derive(Debug, Default, Copy, Clone)]
+pub struct NV2080_CTRL_CMD_FB_GET_FB_REGION_FB_REGION_INFO {
+ pub base: u64_,
+ pub limit: u64_,
+ pub reserved: u64_,
+ pub performance: u32_,
+ pub supportCompressed: u8_,
+ pub supportISO: u8_,
+ pub bProtected: u8_,
+ pub blackList: NV2080_CTRL_CMD_FB_GET_FB_REGION_SURFACE_MEM_TYPE_FLAG,
+}
+#[repr(C)]
+#[derive(Debug, Default, Copy, Clone)]
+pub struct NV2080_CTRL_CMD_FB_GET_FB_REGION_INFO_PARAMS {
+ pub numFBRegions: u32_,
+ pub fbRegion: [NV2080_CTRL_CMD_FB_GET_FB_REGION_FB_REGION_INFO; 16usize],
+}
+#[repr(C)]
+#[derive(Debug, Copy, Clone)]
+pub struct NV2080_CTRL_GPU_GET_GID_INFO_PARAMS {
+ pub index: u32_,
+ pub flags: u32_,
+ pub length: u32_,
+ pub data: [u8_; 256usize],
+}
+impl Default for NV2080_CTRL_GPU_GET_GID_INFO_PARAMS {
+ fn default() -> Self {
+ let mut s = ::core::mem::MaybeUninit::<Self>::uninit();
+ unsafe {
+ ::core::ptr::write_bytes(s.as_mut_ptr(), 0, 1);
+ s.assume_init()
+ }
+ }
+}
+#[repr(C)]
#[derive(Debug, Default, Copy, Clone, Zeroable)]
pub struct DOD_METHOD_DATA {
pub status: u32_,
@@ -367,6 +438,19 @@ pub struct ACPI_METHOD_DATA {
pub capsMethodData: CAPS_METHOD_DATA,
}
#[repr(C)]
+#[derive(Debug, Default, Copy, Clone)]
+pub struct VIRTUAL_DISPLAY_GET_MAX_RESOLUTION_PARAMS {
+ pub headIndex: u32_,
+ pub maxHResolution: u32_,
+ pub maxVResolution: u32_,
+}
+#[repr(C)]
+#[derive(Debug, Default, Copy, Clone)]
+pub struct VIRTUAL_DISPLAY_GET_NUM_HEADS_PARAMS {
+ pub numHeads: u32_,
+ pub maxNumHeads: u32_,
+}
+#[repr(C)]
#[derive(Debug, Default, Copy, Clone, Zeroable)]
pub struct BUSINFO {
pub deviceID: u16_,
@@ -395,6 +479,85 @@ pub struct GSP_PCIE_CONFIG_REG {
pub linkCap: u32_,
}
#[repr(C)]
+#[derive(Debug, Default, Copy, Clone)]
+pub struct EcidManufacturingInfo {
+ pub ecidLow: u32_,
+ pub ecidHigh: u32_,
+ pub ecidExtended: u32_,
+}
+#[repr(C)]
+#[derive(Debug, Default, Copy, Clone)]
+pub struct FW_WPR_LAYOUT_OFFSET {
+ pub nonWprHeapOffset: u64_,
+ pub frtsOffset: u64_,
+}
+#[repr(C)]
+#[derive(Debug, Copy, Clone)]
+pub struct GspStaticConfigInfo_t {
+ pub grCapsBits: [u8_; 23usize],
+ pub gidInfo: NV2080_CTRL_GPU_GET_GID_INFO_PARAMS,
+ pub SKUInfo: NV2080_CTRL_BIOS_GET_SKU_INFO_PARAMS,
+ pub fbRegionInfoParams: NV2080_CTRL_CMD_FB_GET_FB_REGION_INFO_PARAMS,
+ pub sriovCaps: NV0080_CTRL_GPU_GET_SRIOV_CAPS_PARAMS,
+ pub sriovMaxGfid: u32_,
+ pub engineCaps: [u32_; 3usize],
+ pub poisonFuseEnabled: u8_,
+ pub fb_length: u64_,
+ pub fbio_mask: u64_,
+ pub fb_bus_width: u32_,
+ pub fb_ram_type: u32_,
+ pub fbp_mask: u64_,
+ pub l2_cache_size: u32_,
+ pub gpuNameString: [u8_; 64usize],
+ pub gpuShortNameString: [u8_; 64usize],
+ pub gpuNameString_Unicode: [u16_; 64usize],
+ pub bGpuInternalSku: u8_,
+ pub bIsQuadroGeneric: u8_,
+ pub bIsQuadroAd: u8_,
+ pub bIsNvidiaNvs: u8_,
+ pub bIsVgx: u8_,
+ pub bGeforceSmb: u8_,
+ pub bIsTitan: u8_,
+ pub bIsTesla: u8_,
+ pub bIsMobile: u8_,
+ pub bIsGc6Rtd3Allowed: u8_,
+ pub bIsGc8Rtd3Allowed: u8_,
+ pub bIsGcOffRtd3Allowed: u8_,
+ pub bIsGcoffLegacyAllowed: u8_,
+ pub bIsMigSupported: u8_,
+ pub RTD3GC6TotalBoardPower: u16_,
+ pub RTD3GC6PerstDelay: u16_,
+ pub bar1PdeBase: u64_,
+ pub bar2PdeBase: u64_,
+ pub bVbiosValid: u8_,
+ pub vbiosSubVendor: u32_,
+ pub vbiosSubDevice: u32_,
+ pub bPageRetirementSupported: u8_,
+ pub bSplitVasBetweenServerClientRm: u8_,
+ pub bClRootportNeedsNosnoopWAR: u8_,
+ pub displaylessMaxHeads: VIRTUAL_DISPLAY_GET_NUM_HEADS_PARAMS,
+ pub displaylessMaxResolution: VIRTUAL_DISPLAY_GET_MAX_RESOLUTION_PARAMS,
+ pub displaylessMaxPixels: u64_,
+ pub hInternalClient: u32_,
+ pub hInternalDevice: u32_,
+ pub hInternalSubdevice: u32_,
+ pub bSelfHostedMode: u8_,
+ pub bAtsSupported: u8_,
+ pub bIsGpuUefi: u8_,
+ pub bIsEfiInit: u8_,
+ pub ecidInfo: [EcidManufacturingInfo; 2usize],
+ pub fwWprLayoutOffset: FW_WPR_LAYOUT_OFFSET,
+}
+impl Default for GspStaticConfigInfo_t {
+ fn default() -> Self {
+ let mut s = ::core::mem::MaybeUninit::<Self>::uninit();
+ unsafe {
+ ::core::ptr::write_bytes(s.as_mut_ptr(), 0, 1);
+ s.assume_init()
+ }
+ }
+}
+#[repr(C)]
#[derive(Debug, Default, Copy, Clone, Zeroable)]
pub struct GspSystemInfo {
pub gpuPhysAddr: u64_,
diff --git a/drivers/gpu/nova-core/nova_core.rs b/drivers/gpu/nova-core/nova_core.rs
index c1121e7c64c5..b98a1c03f13d 100644
--- a/drivers/gpu/nova-core/nova_core.rs
+++ b/drivers/gpu/nova-core/nova_core.rs
@@ -16,6 +16,7 @@
mod num;
mod regs;
mod sbuffer;
+mod util;
mod vbios;
pub(crate) const MODULE_NAME: &kernel::str::CStr = <LocalModule as kernel::ModuleMetadata>::NAME;
diff --git a/drivers/gpu/nova-core/util.rs b/drivers/gpu/nova-core/util.rs
new file mode 100644
index 000000000000..f1a4dea44c10
--- /dev/null
+++ b/drivers/gpu/nova-core/util.rs
@@ -0,0 +1,16 @@
+// SPDX-License-Identifier: GPL-2.0
+
+/// Converts a null-terminated byte array to a string slice.
+///
+/// Returns "invalid" if the bytes are not valid UTF-8 or not null-terminated.
+pub(crate) fn str_from_null_terminated(bytes: &[u8]) -> &str {
+ use kernel::str::CStr;
+
+ // Find the first null byte, then create a slice that includes it.
+ bytes
+ .iter()
+ .position(|&b| b == 0)
+ .and_then(|null_pos| CStr::from_bytes_with_nul(&bytes[..=null_pos]).ok())
+ .and_then(|cstr| cstr.to_str().ok())
+ .unwrap_or("invalid")
+}
--
2.34.1This one needed some rework.
On Sat Nov 15, 2025 at 4:55 AM JST, Joel Fernandes wrote:
> From: Alistair Popple <apopple@nvidia.com>
>
> After GSP initialization is complete, retrieve the static configuration
> information from GSP-RM. This information includes GPU name, capabilities,
> memory configuration, and other properties. On some GPU variants, it is
> also required to do this for initialization to complete.
>
> Signed-off-by: Alistair Popple <apopple@nvidia.com>
> Co-developed-by: Joel Fernandes <joelagnelf@nvidia.com>
> Signed-off-by: Joel Fernandes <joelagnelf@nvidia.com>
> ---
> drivers/gpu/nova-core/gsp/boot.rs | 7 +
> drivers/gpu/nova-core/gsp/commands.rs | 65 +++++++
> drivers/gpu/nova-core/gsp/fw.rs | 5 +
> .../gpu/nova-core/gsp/fw/r570_144/bindings.rs | 163 ++++++++++++++++++
> drivers/gpu/nova-core/nova_core.rs | 1 +
> drivers/gpu/nova-core/util.rs | 16 ++
> 6 files changed, 257 insertions(+)
> create mode 100644 drivers/gpu/nova-core/util.rs
>
> diff --git a/drivers/gpu/nova-core/gsp/boot.rs b/drivers/gpu/nova-core/gsp/boot.rs
> index c0afafbf35f6..42a3abb9243d 100644
> --- a/drivers/gpu/nova-core/gsp/boot.rs
> +++ b/drivers/gpu/nova-core/gsp/boot.rs
> @@ -40,6 +40,7 @@
> GspFwWprMeta, //
> },
> regs,
> + util, //
> vbios::Vbios,
> };
>
> @@ -237,6 +238,12 @@ pub(crate) fn boot(
> GspSequencer::run(&mut self.cmdq, seq_params, Delta::from_secs(10))?;
>
> commands::gsp_init_done(&mut self.cmdq, Delta::from_secs(10))?;
> + let info = commands::get_gsp_info(&mut self.cmdq, bar)?;
> + dev_info!(
> + pdev.as_ref(),
> + "GPU name: {}\n",
> + util::str_from_null_terminated(&info.gpu_name)
> + );
>
> Ok(())
> }
> diff --git a/drivers/gpu/nova-core/gsp/commands.rs b/drivers/gpu/nova-core/gsp/commands.rs
> index 07abfb54f9d7..6cb32e7d3436 100644
> --- a/drivers/gpu/nova-core/gsp/commands.rs
> +++ b/drivers/gpu/nova-core/gsp/commands.rs
> @@ -17,6 +17,7 @@
> };
>
> use crate::{
> + driver::Bar0,
> gsp::{
> cmdq::{
> Cmdq,
> @@ -25,12 +26,25 @@
> },
> fw::{
> commands::*,
> + GspStaticConfigInfo_t,
> MsgFunction, //
> },
> },
> sbuffer::SBufferIter,
> + util,
> };
>
> +// SAFETY: Padding is explicit and will not contain uninitialized data.
> +unsafe impl AsBytes for GspStaticConfigInfo_t {}
> +
> +// SAFETY: This struct only contains integer types for which all bit patterns
> +// are valid.
> +unsafe impl FromBytes for GspStaticConfigInfo_t {}
> +
> +pub(crate) struct GspStaticConfigInfo {
> + pub gpu_name: [u8; 40],
This is probably meant to be `0x40`, as the `gpuNameString` bindings
member this is built from is 64-bytes long. Changing it to be 64-bytes
long.
> +}
> +
> /// Message type for GSP initialization done notification.
> struct GspInitDone {}
>
> @@ -62,6 +76,57 @@ pub(crate) fn gsp_init_done(cmdq: &mut Cmdq, timeout: Delta) -> Result {
> }
> }
>
> +impl MessageFromGsp for GspStaticConfigInfo {
> + const FUNCTION: MsgFunction = MsgFunction::GetGspStaticInfo;
> + type InitError = Infallible;
> + type Message = GspStaticConfigInfo_t;
> +
> + fn read(
> + msg: &Self::Message,
> + _sbuffer: &mut SBufferIter<array::IntoIter<&[u8], 2>>,
> + ) -> Result<Self, Self::InitError> {
> + let gpu_name_str = util::str_from_null_terminated(&msg.gpuNameString);
> +
> + let mut gpu_name = [0u8; 40];
> + let bytes = gpu_name_str.as_bytes();
> + let copy_len = core::cmp::min(bytes.len(), gpu_name.len());
> + gpu_name[..copy_len].copy_from_slice(&bytes[..copy_len]);
> + gpu_name[copy_len] = b'\0';
We will want to move this into an `impl` block of `fw::commands`, since
`gpuNameString` is supposed to be firmware-specific and thus private.
But actually, do we even need this? When we print the GPU name in
`boot.rs`, we call `util::str_from_null_terminated` again on the bytes
array that we copied from here, but it is guaranteed to succeed if this
call succeeded as well. So I think (and successfully tested that) we can
just expose the raw bytes array as-is here, and extract the name from a
dedicated method.
> +
> + Ok(GspStaticConfigInfo { gpu_name })
> + }
> +}
> +
> +// SAFETY: This struct only contains integer types and fixed-size arrays for which
> +// all bit patterns are valid.
> +unsafe impl Zeroable for GspStaticConfigInfo_t {}
> +
> +struct GetGspInfo;
> +
> +impl CommandToGsp for GetGspInfo {
> + const FUNCTION: MsgFunction = MsgFunction::GetGspStaticInfo;
> + type Command = GspStaticConfigInfo_t;
> + type InitError = Infallible;
> +
> + fn init(&self) -> impl Init<Self::Command, Self::InitError> {
> + init!(GspStaticConfigInfo_t {
> + ..Zeroable::init_zeroed()
> + })
> + }
> +}
> +
> +pub(crate) fn get_gsp_info(cmdq: &mut Cmdq, bar: &Bar0) -> Result<GspStaticConfigInfo> {
> + cmdq.send_command(bar, GetGspInfo)?;
> +
> + loop {
> + match cmdq.receive_msg::<GspStaticConfigInfo>(Delta::from_secs(5)) {
> + Ok(info) => return Ok(info),
> + Err(ERANGE) => continue,
> + Err(e) => return Err(e),
> + }
> + }
> +}
> +
> /// The `GspSetSystemInfo` command.
> pub(crate) struct SetSystemInfo<'a> {
> pdev: &'a pci::Device<device::Bound>,
> diff --git a/drivers/gpu/nova-core/gsp/fw.rs b/drivers/gpu/nova-core/gsp/fw.rs
> index 0cce54310c35..5b6a906ff5dc 100644
> --- a/drivers/gpu/nova-core/gsp/fw.rs
> +++ b/drivers/gpu/nova-core/gsp/fw.rs
> @@ -882,6 +882,11 @@ pub(crate) fn element_count(&self) -> u32 {
> }
> }
>
> +pub(crate) use r570_144::{
> + // GSP static configuration information.
> + GspStaticConfigInfo_t, //
> +};
I've replaced this with a dedicated wrapping type and supporting code in
`fw::commands`, as is done for the other commands.
<snip>
> diff --git a/drivers/gpu/nova-core/util.rs b/drivers/gpu/nova-core/util.rs
> new file mode 100644
> index 000000000000..f1a4dea44c10
> --- /dev/null
> +++ b/drivers/gpu/nova-core/util.rs
> @@ -0,0 +1,16 @@
> +// SPDX-License-Identifier: GPL-2.0
> +
> +/// Converts a null-terminated byte array to a string slice.
> +///
> +/// Returns "invalid" if the bytes are not valid UTF-8 or not null-terminated.
> +pub(crate) fn str_from_null_terminated(bytes: &[u8]) -> &str {
> + use kernel::str::CStr;
> +
> + // Find the first null byte, then create a slice that includes it.
> + bytes
> + .iter()
> + .position(|&b| b == 0)
> + .and_then(|null_pos| CStr::from_bytes_with_nul(&bytes[..=null_pos]).ok())
> + .and_then(|cstr| cstr.to_str().ok())
> + .unwrap_or("invalid")
> +}
Let's not decide what the behavior on an invalid string is for the
caller, and let's make these cases detectable by returning an `Option`.
The caller can then `unwrap_or` it as it wants.
I'll apply these changes locally before pushing, as they are mostly
about harmonizing with the design of other existing commands and don't
change the behavior in any way.
On 11/15/25 4:38 AM, Alexandre Courbot wrote:
> This one needed some rework.
>
> On Sat Nov 15, 2025 at 4:55 AM JST, Joel Fernandes wrote:
>> From: Alistair Popple <apopple@nvidia.com>
...
>> +pub(crate) struct GspStaticConfigInfo {
>> + pub gpu_name: [u8; 40],
>
> This is probably meant to be `0x40`, as the `gpuNameString` bindings
> member this is built from is 64-bytes long. Changing it to be 64-bytes
> long.
Oh yes. The 40 actually resurrects an old bug that I had fixed once,
because it truncates the very long and elaborate Blackwell GB200
card's name that I am testing with.
Good catch!
thanks,
--
John Hubbard
Reviewed-by: Lyude Paul <lyude@redhat.com>
On Fri, 2025-11-14 at 14:55 -0500, Joel Fernandes wrote:
> From: Alistair Popple <apopple@nvidia.com>
>
> After GSP initialization is complete, retrieve the static configuration
> information from GSP-RM. This information includes GPU name, capabilities,
> memory configuration, and other properties. On some GPU variants, it is
> also required to do this for initialization to complete.
>
> Signed-off-by: Alistair Popple <apopple@nvidia.com>
> Co-developed-by: Joel Fernandes <joelagnelf@nvidia.com>
> Signed-off-by: Joel Fernandes <joelagnelf@nvidia.com>
> ---
> drivers/gpu/nova-core/gsp/boot.rs | 7 +
> drivers/gpu/nova-core/gsp/commands.rs | 65 +++++++
> drivers/gpu/nova-core/gsp/fw.rs | 5 +
> .../gpu/nova-core/gsp/fw/r570_144/bindings.rs | 163 ++++++++++++++++++
> drivers/gpu/nova-core/nova_core.rs | 1 +
> drivers/gpu/nova-core/util.rs | 16 ++
> 6 files changed, 257 insertions(+)
> create mode 100644 drivers/gpu/nova-core/util.rs
>
> diff --git a/drivers/gpu/nova-core/gsp/boot.rs b/drivers/gpu/nova-core/gsp/boot.rs
> index c0afafbf35f6..42a3abb9243d 100644
> --- a/drivers/gpu/nova-core/gsp/boot.rs
> +++ b/drivers/gpu/nova-core/gsp/boot.rs
> @@ -40,6 +40,7 @@
> GspFwWprMeta, //
> },
> regs,
> + util, //
> vbios::Vbios,
> };
>
> @@ -237,6 +238,12 @@ pub(crate) fn boot(
> GspSequencer::run(&mut self.cmdq, seq_params, Delta::from_secs(10))?;
>
> commands::gsp_init_done(&mut self.cmdq, Delta::from_secs(10))?;
> + let info = commands::get_gsp_info(&mut self.cmdq, bar)?;
> + dev_info!(
> + pdev.as_ref(),
> + "GPU name: {}\n",
> + util::str_from_null_terminated(&info.gpu_name)
> + );
>
> Ok(())
> }
> diff --git a/drivers/gpu/nova-core/gsp/commands.rs b/drivers/gpu/nova-core/gsp/commands.rs
> index 07abfb54f9d7..6cb32e7d3436 100644
> --- a/drivers/gpu/nova-core/gsp/commands.rs
> +++ b/drivers/gpu/nova-core/gsp/commands.rs
> @@ -17,6 +17,7 @@
> };
>
> use crate::{
> + driver::Bar0,
> gsp::{
> cmdq::{
> Cmdq,
> @@ -25,12 +26,25 @@
> },
> fw::{
> commands::*,
> + GspStaticConfigInfo_t,
> MsgFunction, //
> },
> },
> sbuffer::SBufferIter,
> + util,
> };
>
> +// SAFETY: Padding is explicit and will not contain uninitialized data.
> +unsafe impl AsBytes for GspStaticConfigInfo_t {}
> +
> +// SAFETY: This struct only contains integer types for which all bit patterns
> +// are valid.
> +unsafe impl FromBytes for GspStaticConfigInfo_t {}
> +
> +pub(crate) struct GspStaticConfigInfo {
> + pub gpu_name: [u8; 40],
> +}
> +
> /// Message type for GSP initialization done notification.
> struct GspInitDone {}
>
> @@ -62,6 +76,57 @@ pub(crate) fn gsp_init_done(cmdq: &mut Cmdq, timeout: Delta) -> Result {
> }
> }
>
> +impl MessageFromGsp for GspStaticConfigInfo {
> + const FUNCTION: MsgFunction = MsgFunction::GetGspStaticInfo;
> + type InitError = Infallible;
> + type Message = GspStaticConfigInfo_t;
> +
> + fn read(
> + msg: &Self::Message,
> + _sbuffer: &mut SBufferIter<array::IntoIter<&[u8], 2>>,
> + ) -> Result<Self, Self::InitError> {
> + let gpu_name_str = util::str_from_null_terminated(&msg.gpuNameString);
> +
> + let mut gpu_name = [0u8; 40];
> + let bytes = gpu_name_str.as_bytes();
> + let copy_len = core::cmp::min(bytes.len(), gpu_name.len());
> + gpu_name[..copy_len].copy_from_slice(&bytes[..copy_len]);
> + gpu_name[copy_len] = b'\0';
> +
> + Ok(GspStaticConfigInfo { gpu_name })
> + }
> +}
> +
> +// SAFETY: This struct only contains integer types and fixed-size arrays for which
> +// all bit patterns are valid.
> +unsafe impl Zeroable for GspStaticConfigInfo_t {}
> +
> +struct GetGspInfo;
> +
> +impl CommandToGsp for GetGspInfo {
> + const FUNCTION: MsgFunction = MsgFunction::GetGspStaticInfo;
> + type Command = GspStaticConfigInfo_t;
> + type InitError = Infallible;
> +
> + fn init(&self) -> impl Init<Self::Command, Self::InitError> {
> + init!(GspStaticConfigInfo_t {
> + ..Zeroable::init_zeroed()
> + })
> + }
> +}
> +
> +pub(crate) fn get_gsp_info(cmdq: &mut Cmdq, bar: &Bar0) -> Result<GspStaticConfigInfo> {
> + cmdq.send_command(bar, GetGspInfo)?;
> +
> + loop {
> + match cmdq.receive_msg::<GspStaticConfigInfo>(Delta::from_secs(5)) {
> + Ok(info) => return Ok(info),
> + Err(ERANGE) => continue,
> + Err(e) => return Err(e),
> + }
> + }
> +}
> +
> /// The `GspSetSystemInfo` command.
> pub(crate) struct SetSystemInfo<'a> {
> pdev: &'a pci::Device<device::Bound>,
> diff --git a/drivers/gpu/nova-core/gsp/fw.rs b/drivers/gpu/nova-core/gsp/fw.rs
> index 0cce54310c35..5b6a906ff5dc 100644
> --- a/drivers/gpu/nova-core/gsp/fw.rs
> +++ b/drivers/gpu/nova-core/gsp/fw.rs
> @@ -882,6 +882,11 @@ pub(crate) fn element_count(&self) -> u32 {
> }
> }
>
> +pub(crate) use r570_144::{
> + // GSP static configuration information.
> + GspStaticConfigInfo_t, //
> +};
> +
> // SAFETY: Padding is explicit and will not contain uninitialized data.
> unsafe impl AsBytes for GspMsgElement {}
>
> diff --git a/drivers/gpu/nova-core/gsp/fw/r570_144/bindings.rs b/drivers/gpu/nova-core/gsp/fw/r570_144/bindings.rs
> index c5c589c1e2ac..f081ac1708e6 100644
> --- a/drivers/gpu/nova-core/gsp/fw/r570_144/bindings.rs
> +++ b/drivers/gpu/nova-core/gsp/fw/r570_144/bindings.rs
> @@ -320,6 +320,77 @@ fn fmt(&self, fmt: &mut ::core::fmt::Formatter<'_>) -> ::core::fmt::Result {
> pub const NV_VGPU_MSG_EVENT_NUM_EVENTS: _bindgen_ty_3 = 4131;
> pub type _bindgen_ty_3 = ffi::c_uint;
> #[repr(C)]
> +#[derive(Debug, Default, Copy, Clone)]
> +pub struct NV0080_CTRL_GPU_GET_SRIOV_CAPS_PARAMS {
> + pub totalVFs: u32_,
> + pub firstVfOffset: u32_,
> + pub vfFeatureMask: u32_,
> + pub FirstVFBar0Address: u64_,
> + pub FirstVFBar1Address: u64_,
> + pub FirstVFBar2Address: u64_,
> + pub bar0Size: u64_,
> + pub bar1Size: u64_,
> + pub bar2Size: u64_,
> + pub b64bitBar0: u8_,
> + pub b64bitBar1: u8_,
> + pub b64bitBar2: u8_,
> + pub bSriovEnabled: u8_,
> + pub bSriovHeavyEnabled: u8_,
> + pub bEmulateVFBar0TlbInvalidationRegister: u8_,
> + pub bClientRmAllocatedCtxBuffer: u8_,
> + pub bNonPowerOf2ChannelCountSupported: u8_,
> + pub bVfResizableBAR1Supported: u8_,
> +}
> +#[repr(C)]
> +#[derive(Debug, Default, Copy, Clone)]
> +pub struct NV2080_CTRL_BIOS_GET_SKU_INFO_PARAMS {
> + pub BoardID: u32_,
> + pub chipSKU: [ffi::c_char; 9usize],
> + pub chipSKUMod: [ffi::c_char; 5usize],
> + pub skuConfigVersion: u32_,
> + pub project: [ffi::c_char; 5usize],
> + pub projectSKU: [ffi::c_char; 5usize],
> + pub CDP: [ffi::c_char; 6usize],
> + pub projectSKUMod: [ffi::c_char; 2usize],
> + pub businessCycle: u32_,
> +}
> +pub type NV2080_CTRL_CMD_FB_GET_FB_REGION_SURFACE_MEM_TYPE_FLAG = [u8_; 17usize];
> +#[repr(C)]
> +#[derive(Debug, Default, Copy, Clone)]
> +pub struct NV2080_CTRL_CMD_FB_GET_FB_REGION_FB_REGION_INFO {
> + pub base: u64_,
> + pub limit: u64_,
> + pub reserved: u64_,
> + pub performance: u32_,
> + pub supportCompressed: u8_,
> + pub supportISO: u8_,
> + pub bProtected: u8_,
> + pub blackList: NV2080_CTRL_CMD_FB_GET_FB_REGION_SURFACE_MEM_TYPE_FLAG,
> +}
> +#[repr(C)]
> +#[derive(Debug, Default, Copy, Clone)]
> +pub struct NV2080_CTRL_CMD_FB_GET_FB_REGION_INFO_PARAMS {
> + pub numFBRegions: u32_,
> + pub fbRegion: [NV2080_CTRL_CMD_FB_GET_FB_REGION_FB_REGION_INFO; 16usize],
> +}
> +#[repr(C)]
> +#[derive(Debug, Copy, Clone)]
> +pub struct NV2080_CTRL_GPU_GET_GID_INFO_PARAMS {
> + pub index: u32_,
> + pub flags: u32_,
> + pub length: u32_,
> + pub data: [u8_; 256usize],
> +}
> +impl Default for NV2080_CTRL_GPU_GET_GID_INFO_PARAMS {
> + fn default() -> Self {
> + let mut s = ::core::mem::MaybeUninit::<Self>::uninit();
> + unsafe {
> + ::core::ptr::write_bytes(s.as_mut_ptr(), 0, 1);
> + s.assume_init()
> + }
> + }
> +}
> +#[repr(C)]
> #[derive(Debug, Default, Copy, Clone, Zeroable)]
> pub struct DOD_METHOD_DATA {
> pub status: u32_,
> @@ -367,6 +438,19 @@ pub struct ACPI_METHOD_DATA {
> pub capsMethodData: CAPS_METHOD_DATA,
> }
> #[repr(C)]
> +#[derive(Debug, Default, Copy, Clone)]
> +pub struct VIRTUAL_DISPLAY_GET_MAX_RESOLUTION_PARAMS {
> + pub headIndex: u32_,
> + pub maxHResolution: u32_,
> + pub maxVResolution: u32_,
> +}
> +#[repr(C)]
> +#[derive(Debug, Default, Copy, Clone)]
> +pub struct VIRTUAL_DISPLAY_GET_NUM_HEADS_PARAMS {
> + pub numHeads: u32_,
> + pub maxNumHeads: u32_,
> +}
> +#[repr(C)]
> #[derive(Debug, Default, Copy, Clone, Zeroable)]
> pub struct BUSINFO {
> pub deviceID: u16_,
> @@ -395,6 +479,85 @@ pub struct GSP_PCIE_CONFIG_REG {
> pub linkCap: u32_,
> }
> #[repr(C)]
> +#[derive(Debug, Default, Copy, Clone)]
> +pub struct EcidManufacturingInfo {
> + pub ecidLow: u32_,
> + pub ecidHigh: u32_,
> + pub ecidExtended: u32_,
> +}
> +#[repr(C)]
> +#[derive(Debug, Default, Copy, Clone)]
> +pub struct FW_WPR_LAYOUT_OFFSET {
> + pub nonWprHeapOffset: u64_,
> + pub frtsOffset: u64_,
> +}
> +#[repr(C)]
> +#[derive(Debug, Copy, Clone)]
> +pub struct GspStaticConfigInfo_t {
> + pub grCapsBits: [u8_; 23usize],
> + pub gidInfo: NV2080_CTRL_GPU_GET_GID_INFO_PARAMS,
> + pub SKUInfo: NV2080_CTRL_BIOS_GET_SKU_INFO_PARAMS,
> + pub fbRegionInfoParams: NV2080_CTRL_CMD_FB_GET_FB_REGION_INFO_PARAMS,
> + pub sriovCaps: NV0080_CTRL_GPU_GET_SRIOV_CAPS_PARAMS,
> + pub sriovMaxGfid: u32_,
> + pub engineCaps: [u32_; 3usize],
> + pub poisonFuseEnabled: u8_,
> + pub fb_length: u64_,
> + pub fbio_mask: u64_,
> + pub fb_bus_width: u32_,
> + pub fb_ram_type: u32_,
> + pub fbp_mask: u64_,
> + pub l2_cache_size: u32_,
> + pub gpuNameString: [u8_; 64usize],
> + pub gpuShortNameString: [u8_; 64usize],
> + pub gpuNameString_Unicode: [u16_; 64usize],
> + pub bGpuInternalSku: u8_,
> + pub bIsQuadroGeneric: u8_,
> + pub bIsQuadroAd: u8_,
> + pub bIsNvidiaNvs: u8_,
> + pub bIsVgx: u8_,
> + pub bGeforceSmb: u8_,
> + pub bIsTitan: u8_,
> + pub bIsTesla: u8_,
> + pub bIsMobile: u8_,
> + pub bIsGc6Rtd3Allowed: u8_,
> + pub bIsGc8Rtd3Allowed: u8_,
> + pub bIsGcOffRtd3Allowed: u8_,
> + pub bIsGcoffLegacyAllowed: u8_,
> + pub bIsMigSupported: u8_,
> + pub RTD3GC6TotalBoardPower: u16_,
> + pub RTD3GC6PerstDelay: u16_,
> + pub bar1PdeBase: u64_,
> + pub bar2PdeBase: u64_,
> + pub bVbiosValid: u8_,
> + pub vbiosSubVendor: u32_,
> + pub vbiosSubDevice: u32_,
> + pub bPageRetirementSupported: u8_,
> + pub bSplitVasBetweenServerClientRm: u8_,
> + pub bClRootportNeedsNosnoopWAR: u8_,
> + pub displaylessMaxHeads: VIRTUAL_DISPLAY_GET_NUM_HEADS_PARAMS,
> + pub displaylessMaxResolution: VIRTUAL_DISPLAY_GET_MAX_RESOLUTION_PARAMS,
> + pub displaylessMaxPixels: u64_,
> + pub hInternalClient: u32_,
> + pub hInternalDevice: u32_,
> + pub hInternalSubdevice: u32_,
> + pub bSelfHostedMode: u8_,
> + pub bAtsSupported: u8_,
> + pub bIsGpuUefi: u8_,
> + pub bIsEfiInit: u8_,
> + pub ecidInfo: [EcidManufacturingInfo; 2usize],
> + pub fwWprLayoutOffset: FW_WPR_LAYOUT_OFFSET,
> +}
> +impl Default for GspStaticConfigInfo_t {
> + fn default() -> Self {
> + let mut s = ::core::mem::MaybeUninit::<Self>::uninit();
> + unsafe {
> + ::core::ptr::write_bytes(s.as_mut_ptr(), 0, 1);
> + s.assume_init()
> + }
> + }
> +}
> +#[repr(C)]
> #[derive(Debug, Default, Copy, Clone, Zeroable)]
> pub struct GspSystemInfo {
> pub gpuPhysAddr: u64_,
> diff --git a/drivers/gpu/nova-core/nova_core.rs b/drivers/gpu/nova-core/nova_core.rs
> index c1121e7c64c5..b98a1c03f13d 100644
> --- a/drivers/gpu/nova-core/nova_core.rs
> +++ b/drivers/gpu/nova-core/nova_core.rs
> @@ -16,6 +16,7 @@
> mod num;
> mod regs;
> mod sbuffer;
> +mod util;
> mod vbios;
>
> pub(crate) const MODULE_NAME: &kernel::str::CStr = <LocalModule as kernel::ModuleMetadata>::NAME;
> diff --git a/drivers/gpu/nova-core/util.rs b/drivers/gpu/nova-core/util.rs
> new file mode 100644
> index 000000000000..f1a4dea44c10
> --- /dev/null
> +++ b/drivers/gpu/nova-core/util.rs
> @@ -0,0 +1,16 @@
> +// SPDX-License-Identifier: GPL-2.0
> +
> +/// Converts a null-terminated byte array to a string slice.
> +///
> +/// Returns "invalid" if the bytes are not valid UTF-8 or not null-terminated.
> +pub(crate) fn str_from_null_terminated(bytes: &[u8]) -> &str {
> + use kernel::str::CStr;
> +
> + // Find the first null byte, then create a slice that includes it.
> + bytes
> + .iter()
> + .position(|&b| b == 0)
> + .and_then(|null_pos| CStr::from_bytes_with_nul(&bytes[..=null_pos]).ok())
> + .and_then(|cstr| cstr.to_str().ok())
> + .unwrap_or("invalid")
> +}
--
Cheers,
Lyude Paul (she/her)
Senior Software Engineer at Red Hat
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