unimore/kernel-hacking-2024-linux-steffo
unimore/kernel-hacking-2024-linux-steffo
1
Fork 0
Code Pull requests 5 Wiki Activity

riscv: hwprobe: add zve Vector subextensions into hwprobe interface

Browse source 
The following Vector subextensions for "embedded" platforms are added
into RISCV_HWPROBE_KEY_IMA_EXT_0:
 - ZVE32X
 - ZVE32F
 - ZVE64X
 - ZVE64F
 - ZVE64D

Extensions ending with an X indicates that the platform doesn't have a
vector FPU.
Extensions ending with F/D mean that whether single (F) or double (D)
precision vector operation is supported.
The number 32 or 64 follows from ZVE tells the maximum element length.

Signed-off-by: Andy Chiu <andy.chiu@sifive.com>
Reviewed-by: Clément Léger <cleger@rivosinc.com>
Link: https://lore.kernel.org/r/20240510-zve-detection-v5-6-0711bdd26c12@sifive.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
This commit is contained in:
Andy Chiu 2024-05-10 00:26:56 +08:00 committed by Palmer Dabbelt
parent 1e7483542b
commit de8f8282a9
No known key found for this signature in database
GPG key ID: 2E1319F35FBB1889
3 changed files with 25 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

15
Documentation/arch/riscv/hwprobe.rst
View file

@ -192,6 +192,21 @@ The following keys are defined:
supported as defined in the RISC-V ISA manual starting from commit
d8ab5c78c207 ("Zihintpause is ratified").
* :c:macro:`RISCV_HWPROBE_EXT_ZVE32X`: The Vector sub-extension Zve32x is
supported, as defined by version 1.0 of the RISC-V Vector extension manual.
* :c:macro:`RISCV_HWPROBE_EXT_ZVE32F`: The Vector sub-extension Zve32f is
supported, as defined by version 1.0 of the RISC-V Vector extension manual.
* :c:macro:`RISCV_HWPROBE_EXT_ZVE64X`: The Vector sub-extension Zve64x is
supported, as defined by version 1.0 of the RISC-V Vector extension manual.
* :c:macro:`RISCV_HWPROBE_EXT_ZVE64F`: The Vector sub-extension Zve64f is
supported, as defined by version 1.0 of the RISC-V Vector extension manual.
* :c:macro:`RISCV_HWPROBE_EXT_ZVE64D`: The Vector sub-extension Zve64d is
supported, as defined by version 1.0 of the RISC-V Vector extension manual.
* :c:macro:`RISCV_HWPROBE_KEY_CPUPERF_0`: A bitmask that contains performance
information about the selected set of processors.

5
arch/riscv/include/uapi/asm/hwprobe.h
View file

@ -60,6 +60,11 @@ struct riscv_hwprobe {
#define RISCV_HWPROBE_EXT_ZACAS (1ULL << 34)
#define RISCV_HWPROBE_EXT_ZICOND (1ULL << 35)
#define RISCV_HWPROBE_EXT_ZIHINTPAUSE (1ULL << 36)
#define RISCV_HWPROBE_EXT_ZVE32X (1ULL << 37)
#define RISCV_HWPROBE_EXT_ZVE32F (1ULL << 38)
#define RISCV_HWPROBE_EXT_ZVE64X (1ULL << 39)
#define RISCV_HWPROBE_EXT_ZVE64F (1ULL << 40)
#define RISCV_HWPROBE_EXT_ZVE64D (1ULL << 41)
#define RISCV_HWPROBE_KEY_CPUPERF_0 5
#define RISCV_HWPROBE_MISALIGNED_UNKNOWN (0 << 0)
#define RISCV_HWPROBE_MISALIGNED_EMULATED (1 << 0)

5
arch/riscv/kernel/sys_hwprobe.c
View file

@ -114,6 +114,11 @@ static void hwprobe_isa_ext0(struct riscv_hwprobe *pair,
EXT_KEY(ZIHINTPAUSE);
if (has_vector()) {
EXT_KEY(ZVE32X);
EXT_KEY(ZVE32F);
EXT_KEY(ZVE64X);
EXT_KEY(ZVE64F);
EXT_KEY(ZVE64D);
EXT_KEY(ZVBB);
EXT_KEY(ZVBC);
EXT_KEY(ZVKB);