AlexIndustrial/mesa
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

nak/sm20: Don't allow 64-bit atomics

Browse Source 
The encoding exists and the disassembler will disassemble it but the
hardware throws an ILLEGAL_INSTRUCTION_ENCODING if we ever try to
execute one.  The proprietary driver doesn't expose any 64-bit atomics
features on Kepler A so we assume the hardware just doesn't do them.

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/35149>
This commit is contained in:
Faith Ekstrand
2025-05-24 12:03:09 -04:00
committed by Marge Bot
parent 4d752ad123
commit aad4410b51
1 changed files with 13 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files
src/nouveau/compiler/nak/sm20.rs
+13 -3
View File
@@ -2164,14 +2164,24 @@ impl SM20Op for OpAtom {
// AtomType::U16 => 0x2_u8,
// AtomType::I16 => 0x3_u8,
AtomType::U32 => 0x4_u8,
AtomType::U64 => 0x5_u8,
//AtomType::U128 => 0x6_u8,
AtomType::I32 => 0x7_u8,
AtomType::I64 => 0x8_u8,
//AtomType::I128 => 0x9_u8,
//AtomType::F16 => 0xa_u8,
AtomType::F64 => 0xc_u8,
AtomType::F32 => 0xd_u8,
AtomType::U64 | AtomType::I64 | AtomType::F64 => {
// They encode fine:
//
// AtomType::U64 => 0x5_u8,
// AtomType::I64 => 0x8_u8,
// AtomType::F64 => 0xc_u8,
//
// but the hardware throws an ILLEGAL_INSTRUCTION_ENCODING error
// if we ever actually execute one. Also, the proprietary
// driver doesn't expose any 64-bit atomic features on Kepler A.
panic!("64-bit atomics are not supported");
}
};
e.set_field(9..10, typ & 0x1);
e.set_field(59..62, typ >> 1);