riscv: cpufeature: add zve32[xf] and zve64[xfd] isa detection

Multiple Vector subextensions are added. Also, the patch takes care of
the dependencies of Vector subextensions by macro expansions. So, if
some "embedded" platform only reports "zve64f" on the ISA string, the
parser is able to expand it to zve32x zve32f zve64x and zve64f.

Signed-off-by: Andy Chiu <andy.chiu@sifive.com>
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/20240510-zve-detection-v5-5-0711bdd26c12@sifive.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>

diff --git a/arch/riscv/include/asm/hwcap.h b/arch/riscv/include/asm/hwcap.h
index e17d007..f64d4e9 100644 (file)
--- a/arch/riscv/include/asm/hwcap.h
+++ b/arch/riscv/include/asm/hwcap.h
@@ -81,6 +81,11 @@
 #define RISCV_ISA_EXT_ZTSO             72
 #define RISCV_ISA_EXT_ZACAS            73
 #define RISCV_ISA_EXT_XANDESPMU                74
+#define RISCV_ISA_EXT_ZVE32X           75
+#define RISCV_ISA_EXT_ZVE32F           76
+#define RISCV_ISA_EXT_ZVE64X           77
+#define RISCV_ISA_EXT_ZVE64F           78
+#define RISCV_ISA_EXT_ZVE64D           79
 
 #define RISCV_ISA_EXT_XLINUXENVCFG     127
 

diff --git a/arch/riscv/kernel/cpufeature.c b/arch/riscv/kernel/cpufeature.c
index a6287b7..54a6f53 100644 (file)
--- a/arch/riscv/kernel/cpufeature.c
+++ b/arch/riscv/kernel/cpufeature.c
@@ -188,6 +188,40 @@ static const unsigned int riscv_zvbb_exts[] = {
        RISCV_ISA_EXT_ZVKB
 };
 
+#define RISCV_ISA_EXT_ZVE64F_IMPLY_LIST        \
+       RISCV_ISA_EXT_ZVE64X,           \
+       RISCV_ISA_EXT_ZVE32F,           \
+       RISCV_ISA_EXT_ZVE32X
+
+#define RISCV_ISA_EXT_ZVE64D_IMPLY_LIST        \
+       RISCV_ISA_EXT_ZVE64F,           \
+       RISCV_ISA_EXT_ZVE64F_IMPLY_LIST
+
+#define RISCV_ISA_EXT_V_IMPLY_LIST     \
+       RISCV_ISA_EXT_ZVE64D,           \
+       RISCV_ISA_EXT_ZVE64D_IMPLY_LIST
+
+static const unsigned int riscv_zve32f_exts[] = {
+       RISCV_ISA_EXT_ZVE32X
+};
+
+static const unsigned int riscv_zve64f_exts[] = {
+       RISCV_ISA_EXT_ZVE64F_IMPLY_LIST
+};
+
+static const unsigned int riscv_zve64d_exts[] = {
+       RISCV_ISA_EXT_ZVE64D_IMPLY_LIST
+};
+
+static const unsigned int riscv_v_exts[] = {
+       RISCV_ISA_EXT_V_IMPLY_LIST
+};
+
+static const unsigned int riscv_zve64x_exts[] = {
+       RISCV_ISA_EXT_ZVE32X,
+       RISCV_ISA_EXT_ZVE64X
+};
+
 /*
  * While the [ms]envcfg CSRs were not defined until version 1.12 of the RISC-V
  * privileged ISA, the existence of the CSRs is implied by any extension which
@@ -245,7 +279,7 @@ const struct riscv_isa_ext_data riscv_isa_ext[] = {
        __RISCV_ISA_EXT_DATA(d, RISCV_ISA_EXT_d),
        __RISCV_ISA_EXT_DATA(q, RISCV_ISA_EXT_q),
        __RISCV_ISA_EXT_DATA(c, RISCV_ISA_EXT_c),
-       __RISCV_ISA_EXT_DATA(v, RISCV_ISA_EXT_v),
+       __RISCV_ISA_EXT_SUPERSET(v, RISCV_ISA_EXT_v, riscv_v_exts),
        __RISCV_ISA_EXT_DATA(h, RISCV_ISA_EXT_h),
        __RISCV_ISA_EXT_SUPERSET(zicbom, RISCV_ISA_EXT_ZICBOM, riscv_xlinuxenvcfg_exts),
        __RISCV_ISA_EXT_SUPERSET(zicboz, RISCV_ISA_EXT_ZICBOZ, riscv_xlinuxenvcfg_exts),
@@ -280,6 +314,11 @@ const struct riscv_isa_ext_data riscv_isa_ext[] = {
        __RISCV_ISA_EXT_DATA(ztso, RISCV_ISA_EXT_ZTSO),
        __RISCV_ISA_EXT_SUPERSET(zvbb, RISCV_ISA_EXT_ZVBB, riscv_zvbb_exts),
        __RISCV_ISA_EXT_DATA(zvbc, RISCV_ISA_EXT_ZVBC),
+       __RISCV_ISA_EXT_SUPERSET(zve32f, RISCV_ISA_EXT_ZVE32F, riscv_zve32f_exts),
+       __RISCV_ISA_EXT_DATA(zve32x, RISCV_ISA_EXT_ZVE32X),
+       __RISCV_ISA_EXT_SUPERSET(zve64d, RISCV_ISA_EXT_ZVE64D, riscv_zve64d_exts),
+       __RISCV_ISA_EXT_SUPERSET(zve64f, RISCV_ISA_EXT_ZVE64F, riscv_zve64f_exts),
+       __RISCV_ISA_EXT_SUPERSET(zve64x, RISCV_ISA_EXT_ZVE64X, riscv_zve64x_exts),
        __RISCV_ISA_EXT_DATA(zvfh, RISCV_ISA_EXT_ZVFH),
        __RISCV_ISA_EXT_DATA(zvfhmin, RISCV_ISA_EXT_ZVFHMIN),
        __RISCV_ISA_EXT_DATA(zvkb, RISCV_ISA_EXT_ZVKB),