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charset="utf-8" NVIDIA GPUs are moving away from using NV_PMC_BOOT_0 to contain architecture and revision details, and will instead use NV_PMC_BOOT_42 in the future. NV_PMC_BOOT_0 will contain a specific set of values that will mean "go read NV_PMC_BOOT_42 instead". Change the selection logic in Nova so that it will claim Turing and later GPUs. This will work for the foreseeable future, without any further code changes here, because all NVIDIA GPUs are considered, from the oldest supported on Linux (NV04), through the future GPUs. Add some comment documentation to explain, chronologically, how boot0 and boot42 change with the GPU eras, and how that affects the selection logic. Cc: Alexandre Courbot Cc: Danilo Krummrich Cc: Timur Tabi Reviewed-by: Joel Fernandes Signed-off-by: John Hubbard --- drivers/gpu/nova-core/gpu.rs | 32 +++++++++++++++++++++++++++----- drivers/gpu/nova-core/regs.rs | 22 ++++++++++++++++------ 2 files changed, 43 insertions(+), 11 deletions(-) diff --git a/drivers/gpu/nova-core/gpu.rs b/drivers/gpu/nova-core/gpu.rs index aa8e881dd474..9bc94811741c 100644 --- a/drivers/gpu/nova-core/gpu.rs +++ b/drivers/gpu/nova-core/gpu.rs @@ -174,19 +174,41 @@ pub(crate) struct Spec { =20 impl Spec { fn new(bar: &Bar0) -> Result { + // Some brief notes about boot0 and boot42, in chronological order: + // + // NV04 through NV50: + // + // Not supported by Nova. boot0 is necessary and sufficient to = identify these GPUs. + // boot42 may not even exist on some of these GPUs. + // + // Fermi through Volta: + // + // Not supported by Nova. boot0 is still sufficient to identif= y these GPUs, but boot42 + // is also guaranteed to be both present and accurate. + // + // Turing and later: + // + // Supported by Nova. Identified by first checking boot0 to en= sure that the GPU is not + // from an earlier (pre-Fermi) era, and then using boot42 to p= recisely identify the GPU. + // Somewhere in the Rubin timeframe, boot0 will no longer have= space to add new GPU IDs. + let boot0 =3D regs::NV_PMC_BOOT_0::read(bar); =20 - Spec::try_from(boot0) + if boot0.is_older_than_fermi() { + return Err(ENOTSUPP); + } + + Spec::try_from(regs::NV_PMC_BOOT_42::read(bar)) } } =20 -impl TryFrom for Spec { +impl TryFrom for Spec { type Error =3D Error; =20 - fn try_from(boot0: regs::NV_PMC_BOOT_0) -> Result { + fn try_from(boot42: regs::NV_PMC_BOOT_42) -> Result { Ok(Self { - chipset: boot0.chipset()?, - revision: boot0.revision(), + chipset: boot42.chipset()?, + revision: boot42.revision(), }) } } diff --git a/drivers/gpu/nova-core/regs.rs b/drivers/gpu/nova-core/regs.rs index 8c9af3c59708..81097e83c276 100644 --- a/drivers/gpu/nova-core/regs.rs +++ b/drivers/gpu/nova-core/regs.rs @@ -41,14 +41,24 @@ }); =20 impl NV_PMC_BOOT_0 { - /// Combines `architecture_0` and `architecture_1` to obtain the archi= tecture of the chip. - pub(crate) fn architecture(self) -> Result { - Architecture::try_from( - self.architecture_0() | (self.architecture_1() << Self::ARCHIT= ECTURE_0_RANGE.len()), - ) + pub(crate) fn is_older_than_fermi(self) -> bool { + // From https://github.com/NVIDIA/open-gpu-doc/tree/master/manuals= : + const NV_PMC_BOOT_0_ARCHITECTURE_GF100: u8 =3D 0xc; + + // Older chips left arch1 zeroed out. That, combined with an arch0= value that is less than + // GF100, means "older than Fermi". + self.architecture_1() =3D=3D 0 && self.architecture_0() < NV_PMC_B= OOT_0_ARCHITECTURE_GF100 } +} + +register!(NV_PMC_BOOT_42 @ 0x00000a00, "Extended architecture information"= { + 15:12 minor_revision as u8, "Minor revision of the chip"; + 19:16 major_revision as u8, "Major revision of the chip"; + 23:20 implementation as u8, "Implementation version of the architect= ure"; + 29:24 architecture as u8 ?=3D> Architecture, "Architecture value"; +}); =20 - /// Combines `architecture` and `implementation` to obtain a code uniq= ue to the chipset. +impl NV_PMC_BOOT_42 { pub(crate) fn chipset(self) -> Result { self.architecture() .map(|arch| { --=20 2.51.2