mirror of
https://github.com/torvalds/linux.git
synced 2026-05-05 23:05:25 -04:00
80b3dc0a5a
There are a few remaining cases where we *do* want to use `as`, because we specifically want to strip the data that does not fit into the destination type. Comment these uses to clear confusion about the intent. Acked-by: Danilo Krummrich <dakr@kernel.org> [acourbot@nvidia.com: fix merge conflicts after rebase.] Signed-off-by: Alexandre Courbot <acourbot@nvidia.com> Message-ID: <20251029-nova-as-v3-6-6a30c7333ad9@nvidia.com>
64 lines
1.9 KiB
Rust
64 lines
1.9 KiB
Rust
// SPDX-License-Identifier: GPL-2.0
|
|
|
|
use kernel::prelude::*;
|
|
|
|
use crate::{
|
|
driver::Bar0,
|
|
fb::hal::FbHal,
|
|
regs, //
|
|
};
|
|
|
|
use super::tu102::FLUSH_SYSMEM_ADDR_SHIFT;
|
|
|
|
struct Ga100;
|
|
|
|
pub(super) fn read_sysmem_flush_page_ga100(bar: &Bar0) -> u64 {
|
|
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
|
|
}
|
|
|
|
pub(super) fn write_sysmem_flush_page_ga100(bar: &Bar0, addr: u64) {
|
|
regs::NV_PFB_NISO_FLUSH_SYSMEM_ADDR_HI::default()
|
|
// CAST: `as u32` is used on purpose since the remaining bits are guaranteed to fit within
|
|
// a `u32`.
|
|
.set_adr_63_40((addr >> FLUSH_SYSMEM_ADDR_SHIFT_HI) as u32)
|
|
.write(bar);
|
|
regs::NV_PFB_NISO_FLUSH_SYSMEM_ADDR::default()
|
|
// CAST: `as u32` is used on purpose since we want to strip the upper bits that have been
|
|
// written to `NV_PFB_NISO_FLUSH_SYSMEM_ADDR_HI`.
|
|
.set_adr_39_08((addr >> FLUSH_SYSMEM_ADDR_SHIFT) as u32)
|
|
.write(bar);
|
|
}
|
|
|
|
pub(super) fn display_enabled_ga100(bar: &Bar0) -> bool {
|
|
!regs::ga100::NV_FUSE_STATUS_OPT_DISPLAY::read(bar).display_disabled()
|
|
}
|
|
|
|
/// Shift applied to the sysmem address before it is written into
|
|
/// `NV_PFB_NISO_FLUSH_SYSMEM_ADDR_HI`,
|
|
const FLUSH_SYSMEM_ADDR_SHIFT_HI: u32 = 40;
|
|
|
|
impl FbHal for Ga100 {
|
|
fn read_sysmem_flush_page(&self, bar: &Bar0) -> u64 {
|
|
read_sysmem_flush_page_ga100(bar)
|
|
}
|
|
|
|
fn write_sysmem_flush_page(&self, bar: &Bar0, addr: u64) -> Result {
|
|
write_sysmem_flush_page_ga100(bar, addr);
|
|
|
|
Ok(())
|
|
}
|
|
|
|
fn supports_display(&self, bar: &Bar0) -> bool {
|
|
display_enabled_ga100(bar)
|
|
}
|
|
|
|
fn vidmem_size(&self, bar: &Bar0) -> u64 {
|
|
super::tu102::vidmem_size_gp102(bar)
|
|
}
|
|
}
|
|
|
|
const GA100: Ga100 = Ga100;
|
|
pub(super) const GA100_HAL: &dyn FbHal = &GA100;
|