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5c5a41a754
If built on architectures with CONFIG_ARCH_DMA_ADDR_T_64BIT=y nova-core
produces that following build failures:
error[E0308]: mismatched types
--> drivers/gpu/nova-core/fb.rs:49:59
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49 | hal::fb_hal(chipset).write_sysmem_flush_page(bar, page.dma_handle())?;
| ----------------------- ^^^^^^^^^^^^^^^^^ expected `u64`, found `u32`
| |
| arguments to this method are incorrect
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note: method defined here
--> drivers/gpu/nova-core/fb/hal.rs:19:8
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19 | fn write_sysmem_flush_page(&self, bar: &Bar0, addr: u64) -> Result;
| ^^^^^^^^^^^^^^^^^^^^^^^
help: you can convert a `u32` to a `u64`
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49 | hal::fb_hal(chipset).write_sysmem_flush_page(bar, page.dma_handle().into())?;
| +++++++
error[E0308]: mismatched types
--> drivers/gpu/nova-core/fb.rs:65:47
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65 | if hal.read_sysmem_flush_page(bar) == self.page.dma_handle() {
| ------------------------------- ^^^^^^^^^^^^^^^^^^^^^^ expected `u64`, found `u32`
| |
| expected because this is `u64`
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help: you can convert a `u32` to a `u64`
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65 | if hal.read_sysmem_flush_page(bar) == self.page.dma_handle().into() {
| +++++++
error: this arithmetic operation will overflow
--> drivers/gpu/nova-core/falcon.rs:469:23
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469 | .set_base((dma_start >> 40) as u16)
| ^^^^^^^^^^^^^^^^^ attempt to shift right by `40_i32`, which would overflow
|
= note: `#[deny(arithmetic_overflow)]` on by default
This is due to the code making assumptions on the width of dma_addr_t to
be 64 bit.
While this could technically be handled, it is rather painful to deal
with, as the following example illustrates:
pub(super) fn read_sysmem_flush_page_ga100(bar: &Bar0) -> DmaAddress {
let addr = u64::from(regs::NV_PFB_NISO_FLUSH_SYSMEM_ADDR::read(bar).adr_39_08())
<< FLUSH_SYSMEM_ADDR_SHIFT
| u64::from(regs::NV_PFB_NISO_FLUSH_SYSMEM_ADDR_HI::read(bar).adr_63_40())
<< FLUSH_SYSMEM_ADDR_SHIFT_HI;
addr.try_into().unwrap_or_else(|_| {
kernel::warn_on!(true);
0
})
}
At the same time there's not much value for nova-core to support 32-bit,
given that the supported GPU architectures are Turing and later, hence
depend on CONFIG_64BIT.
Cc: John Hubbard <jhubbard@nvidia.com>
Reported-by: Miguel Ojeda <ojeda@kernel.org>
Closes: https://lore.kernel.org/lkml/20250828160247.37492-1-ojeda@kernel.org/
Fixes: 6554ad65b5 ("gpu: nova-core: register sysmem flush page")
Fixes: 69f5cd67ce ("gpu: nova-core: add falcon register definitions and base code")
Reviewed-by: Alexandre Courbot <acourbot@nvidia.com>
Reviewed-by: John Hubbard <jhubbard@nvidia.com>
Link: https://lore.kernel.org/r/20250828223954.351348-1-dakr@kernel.org
Signed-off-by: Danilo Krummrich <dakr@kernel.org>
17 lines
462 B
Plaintext
17 lines
462 B
Plaintext
config NOVA_CORE
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tristate "Nova Core GPU driver"
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depends on 64BIT
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depends on PCI
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depends on RUST
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depends on RUST_FW_LOADER_ABSTRACTIONS
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select AUXILIARY_BUS
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default n
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help
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Choose this if you want to build the Nova Core driver for Nvidia
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GPUs based on the GPU System Processor (GSP). This is true for Turing
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and later GPUs.
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This driver is work in progress and may not be functional.
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If M is selected, the module will be called nova_core.
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