commit 301c65f49f9602f39b9f3ce0ad9ff70d4bda7226
author Palmer Dabbelt <palmer@rivosinc.com> Fri Nov 10 09:37:16 2023 -0800
committer Alistair Francis <alistair.francis@wdc.com> Wed Nov 22 13:54:02 2023 +1000
tree 39a98b34455cbb36b7e21fbb8eeb6b870c9a7582
parent 8fa379170c2a12476021f5f50d6cf3f672e79e7b

linux-user/riscv: Add Zicboz block size to hwprobe

Support for probing the Zicboz block size landed in Linux 6.6, which was
released a few weeks ago.  This provides the user-configured block size
when Zicboz is enabled.

Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Reviewed-by: Daniel Henrique Barboza <dbarboza@ventanamicro.com>
Message-ID: <20231110173716.24423-1-palmer@rivosinc.com>
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>

linux-user/syscall.c

diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index 16ca5ea..e384e14 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -8808,6 +8808,8 @@
 #define     RISCV_HWPROBE_MISALIGNED_UNSUPPORTED (4 << 0)
 #define     RISCV_HWPROBE_MISALIGNED_MASK        (7 << 0)
 
+#define RISCV_HWPROBE_KEY_ZICBOZ_BLOCK_SIZE 6
+
 struct riscv_hwprobe {
     abi_llong  key;
     abi_ullong value;
@@ -8860,6 +8862,10 @@
         case RISCV_HWPROBE_KEY_CPUPERF_0:
             __put_user(RISCV_HWPROBE_MISALIGNED_FAST, &pair->value);
             break;
+        case RISCV_HWPROBE_KEY_ZICBOZ_BLOCK_SIZE:
+            value = cfg->ext_zicboz ? cfg->cboz_blocksize : 0;
+            __put_user(value, &pair->value);
+            break;
         default:
             __put_user(-1, &pair->key);
             break;