linux-kernel - Re: [PATCH v3 16/19] nova-core: Add support for VBIOS ucode extraction for boot

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Message-ID: <3a32db1ee57f26ed59a69c9aa53f1cfff6f29176.camel@nvidia.com>
Date: Fri, 16 May 2025 20:38:12 +0000
From: Timur Tabi <ttabi@...dia.com>
To: "dakr@...nel.org" <dakr@...nel.org>, "a.hindborg@...nel.org"
	<a.hindborg@...nel.org>, "ojeda@...nel.org" <ojeda@...nel.org>,
	"boqun.feng@...il.com" <boqun.feng@...il.com>, "simona@...ll.ch"
	<simona@...ll.ch>, "tmgross@...ch.edu" <tmgross@...ch.edu>,
	"alex.gaynor@...il.com" <alex.gaynor@...il.com>, "tzimmermann@...e.de"
	<tzimmermann@...e.de>, "corbet@....net" <corbet@....net>,
	"mripard@...nel.org" <mripard@...nel.org>,
	"maarten.lankhorst@...ux.intel.com" <maarten.lankhorst@...ux.intel.com>,
	"benno.lossin@...ton.me" <benno.lossin@...ton.me>, "bjorn3_gh@...tonmail.com"
	<bjorn3_gh@...tonmail.com>, "airlied@...il.com" <airlied@...il.com>,
	"aliceryhl@...gle.com" <aliceryhl@...gle.com>, Alexandre Courbot
	<acourbot@...dia.com>, "gary@...yguo.net" <gary@...yguo.net>
CC: Shirish Baskaran <sbaskaran@...dia.com>, Alistair Popple
	<apopple@...dia.com>, John Hubbard <jhubbard@...dia.com>,
	"rust-for-linux@...r.kernel.org" <rust-for-linux@...r.kernel.org>,
	"dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
	"nouveau@...ts.freedesktop.org" <nouveau@...ts.freedesktop.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, Joel Fernandes
	<joelagnelf@...dia.com>, Ben Skeggs <bskeggs@...dia.com>
Subject: Re: [PATCH v3 16/19] nova-core: Add support for VBIOS ucode
 extraction for boot

On Wed, 2025-05-07 at 22:52 +0900, Alexandre Courbot wrote:
> +impl FwSecBiosImage {
> +    fn setup_falcon_data(
> +        &mut self,
> +        pdev: &pci::Device,
> +        pci_at_image: &PciAtBiosImage,
> +        first_fwsec_image: &FwSecBiosImage,
> +    ) -> Result<()> {
> +        let mut offset = pci_at_image.falcon_data_ptr(pdev)? as usize;
> +
> +        // The falcon data pointer assumes that the PciAt and FWSEC images
> +        // are contiguous in memory. However, testing shows the EFI image sits in
> +        // between them. So calculate the offset from the end of the PciAt image
> +        // rather than the start of it. Compensate.
> +        offset -= pci_at_image.base.data.len();
> +
> +        // The offset is now from the start of the first Fwsec image, however
> +        // the offset points to a location in the second Fwsec image. Since
> +        // the fwsec images are contiguous, subtract the length of the first Fwsec
> +        // image from the offset to get the offset to the start of the second
> +        // Fwsec image.
> +        offset -= first_fwsec_image.base.data.len();
> +
> +        self.falcon_data_offset = Some(offset);
> +
> +        // The PmuLookupTable starts at the offset of the falcon data pointer
> +        self.pmu_lookup_table = Some(PmuLookupTable::new(&self.base.data[offset..])?);
> +
> +        match self
> +            .pmu_lookup_table
> +            .as_ref()
> +            .ok_or(EINVAL)?
> +            .find_entry_by_type(FALCON_UCODE_ENTRY_APPID_FWSEC_PROD)
> +        {
> +            Ok(entry) => {
> +                let mut ucode_offset = entry.data as usize;
> +                ucode_offset -= pci_at_image.base.data.len();
> +                ucode_offset -= first_fwsec_image.base.data.len();
> +                self.falcon_ucode_offset = Some(ucode_offset);
> +                if cfg!(debug_assertions) {
> +                    // Print the v3_desc header for debugging
> +                    let v3_desc = self.fwsec_header(pdev.as_ref())?;
> +                    pr_info!("PmuLookupTableEntry v3_desc: {:#?}\n", v3_desc);
> +                }
> +            }
> +            Err(e) => {
> +                dev_err!(
> +                    pdev.as_ref(),
> +                    "PmuLookupTableEntry not found, error: {:?}\n",
> +                    e
> +                );

Shouldn't you return an error here?

If not, then maybe this should probably be dev_warn.